The present invention relates to a trolley easy to drive or brake.
Trolleys are devices which may run along a rail installed on a ceiling while carrying an object to be transferred. Trolleys described above are generally used in places where transfer of a heavy weight is needed, such as various industrial settings, docks, and vessels.
General trolleys each include a plurality of wheels, a supporting plate unit which runs along a rail having the form of an H-beam or an I-beam, and a link unit provided in the supporting plate unit to carry an object to be transferred. The link unit may carry the object to be transferred through a winding device such as a chain block. Also, a worker may transfer a trolley on which an object hangs through pushing or pulling. As a cited reference, U.S. Pat. No. 4,343,240 (Aug. 10, 1982) and U.S. Pat. No. 4,248,157 (Feb. 3, 1981) may be referred to.
Patent Document 1: U.S. Pat. No. 4,343,240 (Aug. 10, 1982)
Patent Document 2: U.S. Pat. No. 4,248,157 (Feb. 3, 1981)
Therefore, it is an aspect of the present invention to provide a trolley capable of being easily driven or braked and simultaneously with removing chains for driving or braking.
Also, it is another aspect of the present invention to provide a trolley capable of preventing a brake state from being randomly released when power for driving or braking of the trolley is not transferred.
It is still another aspect of the present invention to provide a trolley capable of using a separable handle unit.
It is yet another aspect of the present invention to provide a trolley which removes instability caused by an imbalance in weight of a power transfer unit connected to one side of a body unit.
It is a further aspect of the present invention to provide a trolley which increases in convenience of mounting.
One aspect of the present invention provides a trolley including a body unit which moves along a rail and a power transfer unit which transfers power for driving or braking of the body unit, in which the power transfer unit includes an input shaft, an output shaft which receives power of the input shaft and transfers the power to the body unit, and a locking unit which transfers the power from the input shaft to the output shaft but does not transfer power from the output shaft to the input shaft.
The locking unit may include an active rotating body rotated by the input power and a passive rotating body which is coupled with the active rotating body to rotate in the same direction as a rotational direction of the active rotating body and may rotate the output shaft, and the passive rotating body may be rotatable due to the rotation of the active rotating body but may not rotate due to the rotation of the output shaft.
The locking unit may further include a housing which accommodates the passive rotating body therein and a locking member which is disposed between the housing and the passive rotating body, in which an insertion occurs in one rotational direction. When the active rotating body rotates, since the locking member is not inserted, the passive rotating body may rotate. Also, when the power is transferred from the output shaft to the passive rotating body, since the locking member is inserted, the passive rotating body may not rotate.
The locking unit may further include an unlocking member which is connected to the active rotating body and able to move the locking member due to the rotation of the active rotating body. The active rotating body and the passive rotating body may be coupled to generate a space while rotating in such a way that a rotational force of the active rotating body is not transferred to the passive rotating body as the space. While the active rotating body is rotating as the space, the unlocking member may move the locking member to a place in which an insertion does not occur in such a way that the passive rotating body rotates when the active rotating body passes the space and transfers the rotational force to the passive rotating body.
The locking unit may further include a stud member formed on one of the active rotating body and the passive rotating body and a stud hole which is formed in the other of the active rotating body and the passive rotating body and accommodates the stud member. An inner diameter of the stud hole may be greater than an outer diameter of the stud member, thereby generating a gap between the stud hole and the stud member.
The locking unit may further include an elastic member which pushes the locking member to a place in which the insertion occurs.
The locking member may be provided two or more to generate insertions in different rotational directions and the unlocking member may be provided two or more in response to the locking member in such a way that even when the active rotating body rotates in any direction, the unlocking member moves the locking member to a place in which an insertion does not occur to allow the passive rotating body to rotate.
The power transfer unit may include an input gear connected to the input shaft and an output gear which gears into the input gear and is connected to the output shaft, and the input shaft and the output shaft may be arranged not to be parallel to each other and the input gear and the output gear may be coupled to convert a rotational axis direction to transfer the power input below the body unit to the body unit.
The trolley may further include a connection portion connected to the power transfer unit and a handle unit detachably connected to the connection portion and receives the power, in which the connection portion may include a guide member which guides an end of the handle unit to be easily inserted.
The handle unit may include a connection member connected to the connection portion and a handle bar which includes a bent portion bent by an external force, and when the handle unit is connected to the connection portion, a rotational force of the handle unit may be transferred to the input shaft.
The handle unit may further include an elastic member which provides an elastic force to the bent portion to maintain a state of not being bent when the external force which bends the bent portion is removed.
The handle unit may further include a cover member which exposes or covers the bent portion in such a way that when the cover member covers the bent portion, the handle bar is not bent by the external force.
The handle unit may further include a cover member fixing portion which is able to fix the cover member while the cover member is exposing the bent portion.
The handle unit may include an elastic supporting portion which provides an elastic force in a direction in which the cover member covers the bent portion.
The handle unit may include a connection member connected to the connection portion and a handle bar gripped by a worker to input a rotational force. When the handle unit is connected to the connection portion, the rotational force of the handle unit may be transferred to the input shaft. The handle unit may include a handle physically connected to the handle bar which becomes a rotational axis and located separate from a central axis of the handle bar, a first rotation cover which surrounds an outer diameter of the handle and is independently rotatable, and a second rotation cover which surrounds an outer diameter of the handle bar and is independently rotatable.
The body unit may include rolling wheels which roll along a top surface of the rail and a supporting wheel which rolls along a bottom surface of the rail, and the supporting wheel may be located facing the rolling wheels based on a longitudinal central line of the rail and support the moment generated because the power transfer unit and the locking unit are located in one side based on the longitudinal central line of the rail.
The body unit may include a first supporting plate and a second supporting plate located on both sides based on the longitudinal central line of the rail. The rolling wheels may be coupled with the first supporting plate and the second supporting plate, respectively. The power transfer unit may be coupled with the first supporting plate and the supporting wheel may be coupled with the second supporting plate.
The supporting wheel may be coupled to be changeable in location above and below the body unit.
The body unit may include a first supporting plate and a second supporting plate located on both sides of the longitudinal central line of the rail, a connection shaft member which penetrates and connects the first and second supporting plates, a first spacer which surrounds an outer diameter of the connection shaft member and is provided between a tightening nut and one of the first supporting plate and the second supporting plate to maintain a certain distance between the tightening nut and one of the first supporting plate and the second supporting plate, a second spacer which surrounds the outer diameter of the connection shaft member and is provided between the first supporting plate and the second supporting plate to maintain a certain distance between the first supporting plate and the second supporting plate, and the tightening nut which fixes the connection shaft member and the first and second supporting plates.
Through holes may be formed on both ends of the connection shaft member and a slit whose one side is open may be formed along an outer diameter of the tightening nut in such a way that when a pin is inserted along the through hole while the tightening nut is coupled with the connection shaft member, rotation and separation of the tightening nut are prevented by the pin.
The power transfer unit may further include a case. The case may include a base portion connected to the body unit, through which the input shaft penetrates, and a cover portion coupled with the base portion to surround the input shaft, the output shaft, and the locking unit. The base portion may be coupled with the body unit to be movable up and down to release a coupling state between the input gear and the output gear.
As is apparent from the above description, a trolley in accordance with one embodiment of the present invention removes chains used for inputting power for driving or braking, thereby providing a worker with safety, providing aesthetic external appearance, and moving with less power.
Also, a rotational force is transferred only in a direction from an input shaft to an output shaft, thereby preventing a braking state from being randomly released to provide safety and to increase working efficiency.
Also, bidirectional driving or braking is available, thereby increasing working efficiency.
Also, a separable handle unit is usable and the handle unit is removed when the trolley is not used, thereby preventing a collision with a worker and providing aesthetic external appearance.
Also, the handle unit includes a bent section, thereby easily applying a rotational force, being used in various situations, and reducing fatigue accumulated on a connection section of the trolley.
Also, a supporting wheel is installed on the other side of a body unit in which a power transfer unit is installed, thereby allowing the trolley to stably drive on a rail. The supporting wheel supports a bottom surface of the rail, thereby reducing a load caused by an imbalance in weight.
Also, top and bottom positions of the supporting wheel may be changed, thereby being available to be installed on various rails and increasing ease of installation.
Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the drawings.
Trolleys may run along a rail approximately horizontally installed on a ceiling or in the air and may be used to carry and transfer a heavy weight in various industrial settings, docks, and vessels. Rails, as shown in
Also, there is a limitation such as a safety reason and an aesthetic reason generated by using the chains 2. It is necessary that the chains 2 droop down to a height h to allow the work to pull them. Also, it is difficult to remove the trolley 1 while being not used. Also, the chains 2 have a high level of mobility. Also, the chains 2 are formed of a metallic material and have a considerable weight thereof. Accordingly, when a vessel pitches due to waves, it may be a risk and an obstacle to the worker. Also, the chains 2 occupy a space in the vessel, which spoils an aesthetic appearance of the vessel.
A trolley 100 according to a first embodiment of the present invention removes the chains 2 for driving or braking to overcome the limitation described above.
The trolley 100 according to the first embodiment of the present invention includes wheels 110: 110a and 110b, a body unit 120 which supports the wheels, and the driving unit which transfers a driving force to the wheels.
The wheels 110 may be provided one or more. A plurality of wheels 110 may be disposed two for each of both sides of the rail 10 with gaps therebetween for stable running Totally four wheels 110 on both sides are used according to the first embodiment of the present invention but the number of the wheels 110 and an arrangement thereof are not limited thereto. The number or arrangement of the wheels 110 may vary according to a shape of the rail 10. That is, one wheel 110 may be mounted on the body unit 120.
The body unit 120, as shown in
The connection unit 123, as shown in
A hanging unit 130 may be provided in an arch shape and may be installed to connect middle portions of both the supporting rods 123a. Also, to hang an object, a hanging hole 131 may be provided in the center. As shown in
Meanwhile, the connection unit 123 which connects the first side sheet 121 with the second side sheet 122 according to the first embodiment of the present invention includes the two supporting rods 123a but is not limited thereto. The connection unit 123 may be formed using one supporting rod which connects lower middle portions of the first side sheet 121 and the second side sheet 122. Also, both ends the connection unit 123 may be formed of metal panels or section shape steel fixed to the first side sheet 121 and the second side sheet 122 through welding or bolt-fastening. Also, the connection unit 123 may be a metallic structure formed together with the first side sheet 121 and the second side sheet 122 as a single body. That is, the first side sheet 121, the second side sheet 122, and the connection unit 123 may be manufactured as a single body through casting.
As shown in
One or more of the plurality of wheels 110 include threads 112: 112a and 112b. The driving unit includes a first gear 113 which gears into the threads 112 and has a first axial direction X and a gear unit 200 which is connected to the first gear and changes a driving force in a second axial direction Y into a driving force in the first axial direction X. Since the trolley 100 moves above the worker, the worker may input a driving force below the body unit 120. Accordingly, the second axial direction Y may be vertical to a bottom of the trolley 100 and the first axial direction X may be vertical to both the second axial direction Y and a longitudinal direction of the rail 10.
The trolley 100 according to the first embodiment of the present invention may include a handle unit 400 which provides the driving force in the second axial direction Y. One end of the handle unit 400 may be connected to the gear unit 200, and the other end thereof may extend downward and be located to be operated by the worker.
An operation of the trolley 100 according to the first embodiment of the present invention will be described as follows. When the worker located below the trolley 100 inputs a rotational force in the second axial direction Y by turning the handle unit 400 which extends downward, the driving force in the second axial direction Y is provided to the gear unit 200 connected to the handle unit 400. Since the gear unit 200 includes a driving direction conversion unit such as a bevel gear body, the gear unit 200 may convert the driving force in the second axial direction Y into the driving force in the first axial direction X. The driving force in the first axial direction X rotates the first gear 113 connected to the gear unit 200. The wheels 110 including the threads 112 which gear into the first gear 113 rotate due to the rotation of the first gear 113, thereby allowing the trolley 100 to move on the rail 10.
Only one of the wheels 110 may include the threads 112 and the first gear 113 may be engaged therewith. However, as shown in
The gear unit 200 used for the trolley 100 according to the first embodiment of the present invention will be described in detail. The gear unit 200 may include an input bevel gear 202 which is in contact with an end of the handle unit 400 and includes an input shaft 201 having the second axial direction Y and an output bevel gear 204 which gears into the input bevel gear 202 and includes an output shaft 203. A rotation in the second axial direction Y input through the input shaft 201 of the input bevel gear 202 is converted in an axial direction of the rotation from Y into X through the output shaft 203 of the output bevel gear 204. The output shaft 203 may be parallel to the first axial direction X. However, even when otherwise, the output shaft 203 may be converted into the first axial direction X by another gear body (not shown) connected to the output bevel gear 204. Also, the output bevel gear 204 may be directly connected to a shaft of the first gear 113 to rotate the first gear 113 but may include a speed reducer (not shown) therebetween.
The speed reducer may additionally include a gear to change a rotation ratio of the rotation of the input shaft 201 to the rotation of the wheels 110. For example, when the number of rotations of the wheels 110 is allowed to be greater than that of rotations of the input shaft 201, a speed of the trolley 100 may be increased but the worker needs a great force when a heavy object clings thereto. On the contrary, when the number of rotations of the wheels 110 is smaller than that of rotations of the input shaft 201, the speed of the trolley 100 may be decreased but it is possible to move the trolley 100 to which a heavy object clings with less force.
A gear ratio of the speed reducer may be changed according to an operation of the worker. In this case, it is possible to flexibly drive the trolley 100 depending on various situations. That is, when an object does not clings thereto or a light object clings thereto, the number of rotations of the wheels 110 may be increased to be greater than that of rotations of the input shaft 201. When a heavy object clings thereto or safe driving is necessary, a gear ratio which decreases the number of rotations of the wheels 110 may be used. In addition, when an object with more than a certain weight clings thereto, it is possible to use a speed reducer whose gear ratio is changed to decrease the number of rotations of the wheels 110.
Next, a gear unit 300 used for a trolley 101 according to another embodiment of the present invention will be described in detail.
The gear unit 300 may include a worm gear body. The gear unit 300 may include a worm gear 302 which is in contact with an end of the handle unit 400 and includes an input shaft 301 having the second axial direction Y and a worm wheel 304 which gears into the worm gear 302 and includes an output shaft 303. A rotation in the second axial direction Y input through the input shaft 301 of the worm gear 302 is converted in an axial direction of the rotation from Y into X through the output shaft 303 of the worm wheel 304. The output shaft 303 may be parallel to the first axial direction X. However, even when otherwise, the output shaft 303 may be converted into the first axial direction X by another gear body (not shown) connected to the worm wheel 304. Also, the worm wheel 304 may be directly connected to a shaft of the first gear 113 to rotate the first gear 113 but may include a speed reducer (not shown) therebetween.
Next, the handle unit 400 will be described with reference to
As shown in
The trolley 100 according to the first embodiment of the present invention may be driven using the handle unit 400 while removing the chains 2 (refer to
The handle unit 400 may be detachably connected to the gear unit 200. The handle unit 400 may include a first connection portion 410 connected to an end of the input shaft 201, a second connection portion 420 detachably connected to the first connection portion 410, and a handle bar 430 connected to the second connection portion 420. It is necessary that the first connection portion 410 and the second connection portion 420 transfer a rotational force of the handle bar 430 to the input shaft 201 while being detachable. Accordingly, the first and second connection portions 410 and 420 may each include a groove portion including angled sides and a protrusion portion which has a shape corresponding thereto and is inserted into the groove portion. Since the protrusion portion does not spin while being inserted into the groove portion, a rotational force of the second connection portion 420 may be transferred to the first connection portion 410.
A guide portion 412 which is able to guide the connection protrusion 421 to make connection with the second connection portion 420 easy may be provided in an end of the first connection portion 410. The guide portion 412 may have a shape whose opening becomes wider toward an end thereof. Accordingly, even when the connection protrusion 421 is coupled with the connection groove 411 not fitting completely but inserted into the opening of the guide portion 412, the connection protrusion 421 may be guided along an inner surface of the guide portion 412 and then inserted into the connection groove 411.
Also, to allow the handle unit 400 to easily rotate, as shown in
The handle unit 400 may include bent portions 431 and 440. The bent portions 431 and 440 include portions which are crooked or bent by a joint. Hereinafter, to avoid confusion, a bent portion which is crooked is referred to as a crooked portion 431 (refer to
Torque is proportional to a length between the input shaft 201 (refer to
The joint portion 440 of the handle unit 400 allows the handle unit 400 to be used even when an obstacle is present in a way thereof. Particularly, when a multidirectional joint portion using a universal joint is included, it is possible to proceed while avoiding the obstacle through all spaces.
The joint portion 440 may be located closer to or farther from the body unit 120 than the connection portions 410 and 420. In the case of the trolley 100 shown in
The handle unit 400 in
The handle unit 400 may include a folding preventing portion capable of preventing the joint portion 440 from being folded. When the joint portion 440 is located below the second connection portion 420, since the joint portion 440 may be folded while being connected to the first connection portion 410, a connection process may be not easy. The folding preventing portion prevents the joint portion 440 from being folded during the connection process and may include a cover member 451 which is provided throughout the handle bar 430 to at least partially surround a peripheral part of the joint portion 440 and able to be slidably moved along the handle bar 430. When the cover member 451 is slidably moved toward the second connection portion 420, since the periphery of the joint portion 440 is at least partially surrounded, it is possible to prevent the joint portion 440 from being folded.
Also, an elastic supporting portion 452 which is provided on the handle bar 430 and applies an elastic force to the cover member 451 to return to an original position when the cover member 451 is moved downward to expose the joint portion 440 may be included. The elastic supporting portion 452 supports a bottom end of the cover member 451 to allow the cover member 451 which is moved downward, to return to the original position. Also, a restrictive portion 456 which is provided on one of a bottom end of the second connection portion 420 and a top end of the handle bar 430 and ties a top end of the cover member 451 to restrict an upward movement of the cover member 451 may be provided.
Here, the elastic supporting portion 452 may include a bottom supporting portion 453 which supports the bottom end of the cover member 451 and includes a locking protrusion 453a on a top surface thereof, a fixing member 454b which is provided below the bottom supporting portion 453 and includes a spring member 455 having a restoring force between the fixing member 454b and the bottom supporting portion 453, and a locking clip 454a which is pivotably provided on the fixing member 454b and is fastened to the locking protrusion 453a while the cover member 451 is moving downward. The locking clip 454a may have an end curved once or more to be hung on the locking protrusion 453a.
As shown in
Also, after the handle unit 400 is connected to the first connection portion 410, the cover member 451 is pulled and moved downward to completely expose the joint portion 440 to bend the handle unit 400. Accordingly, the user may transfer rotation of the handle unit 400 to the input shaft 201 at the slant angle to drive. Here, while the cover member 451 which is pulled is being fixed by fastening the locking clip 454a to the locking protrusion 453a of the cover member 451, a rotation operation may be performed by the handle unit 400.
Meanwhile, as described above, the handle unit 400 may be connected to the first connection portion 410 connected to the gear unit 200 when it is necessary to use the trolley 100. As described above, when the user rotates the handle unit 400 while the handle unit 400 is being connected, the input shaft 201 connected to the first connection portion 410 is rotated. Accordingly, the user may rotate the input shaft 201 forward or backward by rotating the handle unit 400 forward or backward, thereby operating the driving unit to perform bidirectional movement.
Next, referring to
The handle unit 400 includes the first connection portion 410 connected to the input shaft 201. The first connection portion 410 may include the connection groove 411 having a polygonal shape with which the handle unit 400 is detachably coupled. The handle unit 400 includes the second connection portion 420 including the connection protrusion 421 which is coupled with the first connection portion 410 and has a polygonal shaped end, and the handle bar 430 which is connected to the second connection portion 420 and the crooked portion 431 and curved once or more for bending. Hereinafter, bending means being bent at a certain angle and curved, which may be defined as a term including all cases of bending deformation from an upright state.
The crooked portion 431 described above, as shown in a partially enlarged portion in
Accordingly, as shown in
Referring to
Referring to
The rail 10, as shown in
The plurality of wheels 510 may be disposed two for each of the both sides of the rail 10 while being separate from each other for safe running. In the present embodiment, among four wheels 510 in total, two for each of the both sides are used but the number of the wheels 510 and an arrangement thereof are not limited thereto. The number or arrangement of the wheels 510 may vary according to a change in shape of the rail 10. That is, one wheel 510 may be mounted on the body unit 520.
The body unit 520, as shown in
The connection unit 523, as shown in
The hanging unit 530 may be provided in an arch shape and may be installed to connect middle portions of both the supporting rods 523a. Also, to hang an object, a hanging hole 531 may be provided in the center. As shown in
Meanwhile, the connection unit 523 which connects the first side sheet 521 with the second side sheet 522 according to the present embodiment includes the two supporting rods 523a but is not limited thereto. The connection unit 523 may be formed using one supporting rod which connects lower middle portions of the first side sheet 521 and the second side sheet 522. Also, both ends of the connection unit 523 may be formed of metal panels or section shape steel fixed to the first side sheet 521 and the second side sheet 522 through welding or bolt-fastening. Also, the connection unit 523 may be a metallic structure formed together with the first side sheet 521 and the second side sheet 522 as a single body. That is, the first side sheet 521, the second side sheet 522, and the connection unit 523 may be provided as a single body through casting.
Also, a third side sheet 524 may be included to fix one of the brake unit 610 and a gear unit 710. The third side sheet 524 may be fixed to the first side sheet 521 and may have a hexahedral shape to include the gear unit 710. However, regardless of the shape, when it satisfies fixing one of the brake unit 610 and the gear unit 710, the third side sheet 524 may be formed together with the first side sheet 521 as a single body.
As shown in
Hereinafter, referring to
The brake unit 610 is a device for fixing the wheels 510 which move on the rail 10 and includes brake plates 611, brake pads 612, and displays 614.
The brake plate 611 is a member in a plate shape having a certain thickness and a bottom thereof is coupled with an input shaft 711. Accordingly, when the input shaft 711 rotates due to a handle unit 800, the brake plate 611 circles around the input shaft 711. The brake plate 611 may be coupled with the brake pad 612 on one side.
The brake pad 612 is in contact with an outside of the wheel 510 and fixes the trolley 500, which may be coupled with one side of the brake plate 611. The brake pad 612 is vertically coupled with inner one end of the brake plate 611 and may be in contact with or separated from the wheel 510 depending on rotation of the brake plate 611. One side of the brake pad 612 may be fixed to the brake plate 611 and the other side thereof may be in contact with wheel 510.
The brake pad 612 may be formed as an elastic body elastically restorable. For example, the brake pad 612 may be formed of elastic rubber. However, the brake pad 612 is not limited to the rubber and may be modified using other elastic materials.
The brake pad 612 may have an indented surface 615 in contact with the wheel 510. Accordingly, when the brake pad 612 is in contact with the wheel 510, the brake pad 612 may be completely close to the outside of the wheel 510 and may fix the wheel 510 moving along the rail 10.
Also, a protrusion (not shown) may be formed on one side of the brake pad 612. The protrusion is formed on a bottom of the brake pad 612. That is, the brake pad 612 may have a shape in which the bottom more protrudes than a top. The protrusion is interposed between the wheel 510 and the rail 10 when the brake pad 612 is in contact with the wheel 510. Accordingly, the wheel 510 may be completely fixed by the protrusion. Also, since the protrusion functions as a wedge, it is possible to prevent the wheel 510 from being pushed back.
Meanwhile, the display 614 may be formed on the one side of the brake plate 611. The display 614 allows checking whether the trolley 500 is fixed and may be formed on the one end of the brake plate 611. The display 614 may be easily distinguished using a method of painting an inner side and outer side using mutually different colors. Accordingly, when viewed from below the trolley 500, it may be easily checked whether the trolley 500 is fixed. For example, when the brake pad 612 is in contact with the wheel 510, since the display 614 may protrude from the outside of the body unit 520, it may be checked that the trolley 500 is fixed to the rail 10. On the contrary, when the brake pad 612 is separated from the wheel 510, since the display 614 may not protrude from the outside of the body unit 520, it may be checked that the trolley 500 is not fixed to the rail 10.
The display 614 may longitudinally extend from the one end of the brake plate 611. However, the display 614 is not limited to longitudinal extension from the brake plate 611 but may be modified as various structures. For example, the display 614 may vertically extend from the brake plate 611.
The brake unit 610 operates due to the input shaft 711 as described above. The gear unit 710 may be provided between the brake unit 610 and the handle unit 800 which inputs a rotational force for rotating the input shaft 711. Referring to
The brake plate 611a in the front is connected to the input shaft 711 through a connection member 613a and rotates at the same time as the input shaft 711 rotates. To operate the brake plate 611b in the rear at the same time, a bevel gear body may be used. A first gear 712 rotates together with the input shaft 711, and a second gear 713 which gears into the first gear 712 and converts a rotation-axial direction is connected to a third gear 715 through a connection shaft 714. A fourth gear 716 may gear into the third gear 715 and may convert a rotation-axial direction. The first gear 712, the second gear 713, the third gear 715, and the fourth gear 716 may be formed of mutual bevel gear bodies. The fourth gear 716 rotates a fourth gear shaft 717. The fourth gear shaft 717 is connected to the brake plate 611b in the rear through a connection member 613b to rotate the brake plate 611b. As a result, one rotation of the input shaft 711 changes in a rotational direction through the gear unit 710 and rotates the two brake plates 611a and 611b, thereby pressing or rubbing brake pads 612a and 612b coupled with both the brake plates 611a and 611b toward or against the wheels 510a and 510b to brake the trolley 500.
Next, referring to
A brake unit 620 is a device for fixing the wheels 510 which move on the rail 10 and includes brake plates 621, brake pads 622, and displays 624.
The brake plate 621 has a certain thickness and may have one of a plate shape to pressurize wheel sides 511 and a curved shape to pressurize the wheel sides 511 and corners at the same time.
The brake plate 621 may be coupled with the brake pad 622 on one side. The brake pad 622 is in contact with the outside of the wheel 510 and fixes the trolley 501, which may be coupled with the one side of the brake plate 621. The brake pad 622 is coupled with inner one end of the brake plate 621 and may be in contact with or separate from the wheel 510 depending on the sliding of the brake plate 621. One side of the brake pad 622 may be fixed to the brake plate 621 and the other side thereof may be in contact with wheel 510.
The brake pad 622 may be formed as an elastic body elastically restorable. For example, the brake pad 622 may be formed of elastic rubber. However, the brake pad 622 is not limited to the rubber and may be modified using other elastic materials.
Meanwhile, the display 624 may be formed on the one side of the brake plate 621. The display 624 allows checking whether the trolley 501 is fixed and may be formed on the one end of the brake plate 621. The display 624 may be easily distinguished using a method of painting an inner side and outer side using mutually different colors. Accordingly, when viewed from below the trolley 501, it may be easily checked whether the trolley 501 is fixed. For example, when the brake pad 622 is in contact with the wheel 510, since the display 624 does not protrude from the outside of the body unit 520, it may be checked that the trolley 501 is not fixed to the rail 10. On the contrary, when the brake pad 622 is separated from the wheel 510, since the display 624 protrudes from the outside of the body unit 520, it may be checked that the trolley 501 is fixed to the rail 10.
The display 624 may longitudinally extend from the one end of the brake plate 621. However, the display 624 is not limited to longitudinal extension from the brake plate 621 but may be modified as various structures. For example, the display 624 may vertically extend from the brake plate 621.
A process in which the brake unit 620 performs translation due to the rotation of the input shaft 711 will be described. The input shaft 711 is connected to a pinion gear 723a, and the pinion gear 723a rotates together with the rotation of the input shaft 711 at the same time. A brake plate 621a is connected to a rack gear 723b which gears into the pinion gear 723a and then performs translation due to the pinion gear 723a which rotates. Here, the translation is guided by a guide member 623a in one direction.
The gear unit 720 may be provided between the brake unit 620 and the handle unit 800. Referring to
Since the brake plate 621a in the front is connected to the pinion gear 723a connected to the input shaft 711 through the rack gear 723b which gears into the pinion gear 723a, the brake plate 621a performs translation at the same time when the input shaft 711 rotates. To operate the brake plate 621b in the rear at the same time, a bevel gear body may be used. A first gear 722 rotates together with the input shaft 711, and a second gear 724 which gears into the first gear 722 and converts a rotation-axial direction is connected to a third gear 726 through a connection shaft 725. A fourth gear 727 may gear into the third gear 726 and may convert a rotation-axial direction. The first gear 722, the second gear 724, the third gear 726, and the fourth gear 727 may be formed of mutual bevel gear bodies. The fourth gear 727 rotates a fourth gear shaft 729. Since the fourth gear shaft 729 is connected to a pinion gear 728a, the pinion gear 728a is rotated. The brake plate 621b coupled with a rack gear 728b which gears into the pinion gear 728a applies or releases pressure to or from the wheel 510b while performing translation together with the rack gear 728b. Here, the translation may be guided by a guide member 623b in one direction.
As a result, one rotation of the input shaft 711 changes in a rotational direction through the gear unit 720 and rotates the two brake plates 621a and 621b, thereby pressing or rubbing brake pads 622a and 622b coupled with both the brake plates 621a and 621b toward or against the wheels 510a and 510b to brake the trolley 501.
Next, referring to
A brake unit 630, as shown in
The screw shaft 631, as shown in
The pressurizing unit includes a first moving member 632 and a second moving member 633 coupled with the left screw portion 631a and the right screw portion 631b of the screw shaft 631, respectively, a pressurizing member 634 disposed below the rail 10 above the screw shaft 631 and provided as an approximately plate shape, a first connection link 635 which connects one side of the pressurizing member 634 with the first moving member 632, and a second connection link 636 which connects the other side of the pressurizing member 634 with the second moving member 633.
Both ends of the first connection link 635 are rotatably coupled with the pressurizing member 634 and the first moving member 632, respectively. In the same way, the second connection link 636 connects the second moving member 633 with the pressurizing member 634. A friction pad 544a may be attached to a top surface of the pressurizing member 634 which is in contact with the rail 10 to increase a frictional force. The friction pad 544a may be formed of a material having a great frictional force such as rubber, silicone, and leather. Also, the pressurizing unit, as shown in
In the brake unit 630 described above, the first moving member 632 and the second moving member 633 move in two opposite directions due to the rotation of the screw shaft 631 in such a way that the first and second connection links 635 and 636 push up or drag down the pressurizing member 634 to allow the pressurizing member 634 to ascend or descend. Also, the pressurizing member 634 may put a brake by pressurizing the bottom surface of the rail 10 through ascending as shown in
Also, the trolley 502 according to the fourth embodiment of the present invention, as shown in
The gear unit 730, as shown in
A gear unit according to the embodiments of the present invention is not limited to a bevel gear body.
A gear unit 740 of
In the gear unit 740 of
Next, the handle unit 800 of the trolley 500 according to the second embodiment of the present invention will be described.
As shown in
The handle unit 800 is basically for operating the brake unit 610 but may be used by the worker to move the trolley 500. That is, the worker may grip the handle unit 800 and may provide a pull or push to move the trolley 500 on the rail 10. The handle unit 800 is connected to the input shaft 711 of the gear unit 710. When the worker applies a force to the handle unit 800 to move the trolley 500, the handle unit 800 having a long bar shape applies torque to the input shaft 711. The torque described above may cause a damage of the input shaft 711 as fatigue accumulates.
Accordingly, the handle unit 800 may include bent portions 831 and 840. The bent portions 831 and 840 include portions which are bent or folded by a joint. Hereinafter, to avoid confusion, a bent portion which is crooked is referred to as a crooked portion 831 (refer to
The joint portion 840 of the handle unit 800 may be used even when an obstacle exists in the proceeding direction. Particularly, when a multidirectional joint portion using a universal joint is included, it is possible to proceed while avoiding the obstacle through all spaces.
Also, since the handle unit 800 includes connection portions 810 and 820, it is possible to separate the handle unit 800 from the gear unit 710 when the trolley 500 does not operate. Accordingly, the handle unit 800 which may acts as a risk factor in movement of the worker may be temporarily removed and it is possible to make an external appearance of the inside of a vessel aesthetic. Since a general trolley is driven using chains or a brake unit is operated, it is necessary to always hang chains to be within a worker's reach. The chains described above act as a risk factor to the worker due to swinging caused by pitching of the vessel. Since it is impossible to remove the general trolley while being not used for a long time, aesthetic thereof is spoiled and there are present risk factors.
The joint portion 840 may be located closer to or farther from the body unit 520 than the connection portions 810 and 820. In the trolley 500 of
The handle unit 800 in
To easily couple the first connection portion 810 with the second connection portion 820, a guide portion 813 which may guide the second connection portion 820 to the first connection portion 810 may be included. The guide portion 813 may be provided on an end of the first connection portion 810 and may have a shape whose opening becomes greater toward an end thereof.
The handle unit 800 may include a folding preventing portion capable of preventing the joint portion 840 from being folded. When the joint portion 840 is located below the second connection portion 820, since the joint portion 840 is folded while being connected to the first connection portion 810, a connection process may be not easy. The folding preventing portion prevents the joint portion 840 from being folded during the connection process and may include a cover member 851 which is provided throughout the handle bar 830 to at least partially surround a peripheral part of the joint portion 840 and able to slidably move along the handle bar 830. When the cover member 851 slidably moves toward the second connection portion 820, since the periphery of the joint portion 840 is at least partially surrounded, it is possible to prevent the joint portion 840 from being folded.
Also, an elastic supporting portion 852 which is provided on the handle bar 830 and applies an elastic force to the cover member 851 to return to an original position when the cover member 851 moves downward to expose the joint portion 840 may be included. The elastic supporting portion 852 supports a bottom end of the cover member 851 to allow the cover member 851 which moves downward to return to the original position. Also, a restrictive portion 856 which is provided on one of a bottom end of the second connection portion 820 and a top end of the handle bar 830 and ties a top end of the cover member 851 to restrict an upward movement of the cover member 851 may be provided.
Here, the elastic supporting portion 852 may include a bottom supporting portion 853 which supports the bottom end of the cover member 851 and includes a locking protrusion 853a on a top thereof, a fixing member 854b which is provided below the bottom supporting portion 853 and includes a spring member 855 having a restoring force between the fixing member 854b and the bottom supporting portion 853, and a locking clip 854a which is pivotably provided on the fixing member 854b and is fastened to the locking protrusion 853a while the cover member 851 is moving downward. The locking clip 854a may have an end curved once or more to be hung on the locking protrusion 853a.
As shown in
Meanwhile, as described above, the handle unit 800 may be connected to the first connection portion 810 connected to the gear unit 710 when it is necessary to use the trolley 500. As described above, when the user rotates the handle unit 800 while the handle unit 800 is being connected, the input shaft 711 connected to the first connection portion 810 is rotated. Accordingly, the user may rotate the input shaft 711 forward or backward by rotating the handle unit 800 forward or backward, thereby operating the brake unit to put or release a brake.
Next, referring to
The handle unit 800 includes the first connection portion 810 connected to the input shaft 711. The handle unit 800 includes the second connection portion 820 coupled with the first connection portion 810 and the handle bar 830 which is connected to the second connection portion 820 through the crooked portion 831 and bent once or more. Hereinafter, bending means being bent at a certain angle and curved, which may be defined as a term including all cases of bending deformation from an upright state.
The crooked portion 831 described above, as shown in a partially enlarged portion in
Accordingly, as shown in
Next, a method of using the trolley 500 according to the second embodiment of the present invention will be described.
When to transfer a heavy object using the trolley 500, as shown in
The user may move the heavy object together with the trolley 500 in a desirable direction though pushing or pulling the heavy object or pushing or pulling the handle unit 800 in this state. In this case, the brake of the brake unit 610 is released.
After the user transfers the trolley 500 to a desirable position or when to stop the trolley 500 at a present position, the movement of the body unit 520 may be restricted using the brake unit 610. That is, after the handle unit 800 is connected to the first connection portion 810 of the gear unit 710, as shown in
When the brake is performed as described above, since the brake pad 612 attached to the one side of the brake plate 611 compresses the wheel 510 (refer to
To release the brake of the trolley 500, the handle unit 800 is connected to the first connection portion 810 of the gear unit 710 again and the brake unit 610 is reversely operated, thereby easily releasing the brake.
Next, referring to
The handle unit 800 may include the first connection portion 810 connected to the gear unit 710 and the second connection portion 820 connected to the first connection portion 810. Since the second connection portion 820 is connected to the handle bar 830 to which the worker applies a rotational force, and the first connection portion 810 and the second connection portion 820 are inserted to be separable and to transfer the rotational force, the rotational force of the handle bar 830 is transferred to the gear unit 710 through the first connection portion 810.
The first connection portion 810 and the second connection portion 820 may be connected through coupling a groove portion with a protrusion portion corresponding thereto and may include the groove portion and the protrusion portion formed with angles to transfer the rotational force without any loss.
The first connection portion 810 of the handle unit 800 according to the embodiment of the present invention includes a connection member 811 connected to the gear unit 710 and an insertion member 812 connected to the connection member 811, into which the second connection portion 820 is inserted. Although the connection member 811 is connected to the gear unit 710 in the present embodiment, on the other hand, the connection member 811 may be connected to the brake unit 610 and may directly transfer the rotational force of the handle unit 800 to the brake unit 610 without the gear unit 710. An insertion protrusion 821 is provided on an end of the second connection portion 820, and a through groove 812a corresponding to a shape of the insertion protrusion 821 is formed on an end of the insertion member 812. The insertion protrusion 821 is inserted through the through groove 812a and then is rotated inside an insertion space 812b provided inside the insertion member 812 to prevent being separated again toward the through groove 812a. Here, shapes of the insertion protrusion 821 and the through groove 812a, as shown in
The insertion space 812b may be provided to allow the insertion protrusion 821 to rotate at a certain angle but is not limited thereto as shown in
To transfer a rotational force of the second connection portion 820 to the first connection portion 810, it is necessary that the handle unit 800 can prevent the insertion protrusion 821 from rotating inside the insertion space 812b. For this, a mounting groove 812c formed contrary to the through groove 812a may be included. A shape of the mounting groove 812c may be similar to the shape of the through groove 812a and may prevent the insertion protrusion 821 from being separated by including a bottom surface, which differs from the through groove 812a. Also, the shape of the mounting groove 812c is not limited to a concave shape as shown in
The insertion member 812 may include an elastic supporting portion 812d which applies a force to the insertion protrusion 821 toward the through groove 812a to allow the insertion protrusion 821 to transfer the rotational force of the second connection portion 820 to the first connection portion 810 without any loss. The elastic supporting portion 812d may include a supporting surface 812e and an elastic member 812f, may pressurize the insertion protrusion 821 while the insertion protrusion 821 is being inserted and rotated, may prevent the insertion protrusion 821 from rotating when the rotational force is input through the second connection portion 820, and may transfer the rotational force to the first connection portion 810 without any loss. Here, when the mounting groove 812c is included as described above, the elastic supporting portion 812d only prevents the insertion protrusion 821 from being separated from the mounting groove 812c, thereby more effectively preventing a loss of the rotational force. A shape of the supporting surface 812e and a shape of the elastic member 812f are not limited to shapes shown in
Hereinafter, connection between the first connection portion 810 and the second connection portion 820 will be described with reference to
The insertion protrusion 821 provided on the end of the second connection portion 820 is inserted into the through groove 812a provided on the end of the first connection portion 810 and corresponding to the shape of the insertion protrusion 821. The insertion protrusion 821 meets the elastic supporting portion 812d while passing through the through groove 812a and lifts the supporting surface 812e by applying a force greater than an elastic force of the elastic member 812f. After completely passing through the through groove 812a, the insertion protrusion 821 rotates 90 degrees, thereby being mounted on the mounting groove 812c. Here, when an external force applied to the elastic supporting portion 812d is removed, the elastic supporting portion 812d pressurizes the insertion protrusion 821 toward the through groove 812a, thereby preventing the insertion protrusion 821 from being separated from the mounting groove 812c. Thereby, the rotational force applied to the second connection portion 820 may be transferred to the first connection portion 810 without any loss and the second connection portion 820 is not separated from the first connection portion 810 until the worker applies a force upward to allow the insertion protrusion 821 to lift the elastic supporting portion 812d, thereby allowing stable rotation.
Next, referring to
The trolley 900 according to the fifth embodiment of the present invention may include a body unit 910 which moves along the rail 10, wheels which are connected to the body unit 910 and roll along the rail 10, and a power transfer unit 940 which transfers power for driving or braking of the body unit 910.
The body unit 910 may include a first supporting plate 911 and a second supporting plate 912 located on both sides of a proceeding direction of the rail 10 and a connection unit 914 which connects the first and second supporting plates 911 and 912. The first supporting plate 911 and the second supporting plate 912 may be disposed in parallel interposing the rail 10 therebetween.
Two connection units 914, as shown in
The two connection units 914 disposed in parallel are connected to the first and second supporting plates 911 and 912, thereby preventing degrees of freedom in rotation of the first and second supporting plates 911 and 912. Also, the connection units 914 may adjust a distance between the first supporting plate 911 and the second supporting plate 912 by controlling the number of washers or bushes coupled with outsides of the supporting rods 914b between the first supporting plate 911 and the second supporting plate 912. Accordingly, corresponding to a width of the rail 10 which is applied, the distance between the first supporting plate 911 and the second supporting plate 912 may be adjusted. A plurality of tightening nuts 914a are fastened to the respective supporting rods 914b outside the first and second supporting plates 911 and 912, thereby allowing the supporting rods 914b to be strongly coupled with the first and second supporting plates 911 and 912.
A hanging unit 915 may be provided in an arch shape and may be installed to connect middle portions of both the supporting rods 914b. Also, to hang an object, a hanging hole (not shown) may be provided in the center. A winding device such as a chain block may be hung and installed on the hanging unit 915. It is possible to hang an object to be transferred through directly binding a rope with the hanging hole.
Meanwhile, the connection units 914 which connect the first supporting plate 911 with the second supporting plate 912 according to the present embodiment include the two supporting rods 914b but are not limited thereto. The connection unit 914 may be formed using one supporting rod 914b which connects lower middle portions of the first supporting plate 911 and the second supporting plate 912. Also, both ends of the connection unit 914 may be formed of metal panels or section shape steel fixed to the first supporting plate 911 and the second supporting plate 912 through welding or bolt-fastening. Also, the connection unit 914 may be a metallic structure formed together with the first supporting plate 911 and the second supporting plate 912 as a single body. That is, the first supporting plate 911, the second supporting plate 912, and the connection unit 914 may be provided as a single body through casting.
Hereinafter, components of the connection unit 914 will be described in detail with reference to
The connection units 914 may each include the supporting rod 914b which connects the first and second supporting plates 911 and 912 and the tightening nuts 914a which are fastened to both ends of the supporting rod 914b and fix the first and second supporting plates 911 and 912. Also, the supporting rod 914b may include a connection shaft member 914b-1 which penetrates the first and second supporting plates 911 and 912 and spacers 914b-2 and 914b-3 which are coupled with an outer circumferential surface of the connection shaft member 914b-1 to maintain a certain distance.
The first and second supporting plates 911 and 912 may include a shaft supporting portion 911a which extends toward one side to support the connection shaft member 914b-1 and includes a through hole through which the connection shaft member 914b-1 penetrates. In the drawings, the shaft supporting portion 911a which extends between the first and second supporting plates 911 and 912 is shown. On the other hand, the shaft supporting portion 911a may protrude from the first and second supporting plates 911 and 912 or may be formed on both sides. The supporting rod 914b supports a heavy object in addition to coupling and fixing the first and second supporting plates 911 and 912. Here, as a weight of the object increases, a force applied to the supporting rod 914b increases, thereby increasing a force applied to the first and second supporting plates 911 and 912. Here, the shaft supporting portion 911a formed on the first and second supporting plates 911 and 912 increases in an area which receives the force applied by the connection shaft member 914b-1, thereby distributing the force. Accordingly, it is possible to hang a heavier object on the hanging unit 915 and to increase the durability of the trolley 900.
The spacers 914b-2 and 914b-3 may include first spacers 914b-2 which are coupled with the outer circumferential surface of the connection shaft member 914b-1 protruding from external surfaces of the first and second supporting plates 911 and 912 and maintain certain distances between the first and second supporting plates 911 and 912 and the tightening nuts 914a and second spacers 914b-3 which are coupled with the outer circumferential surface of the connection shaft member 914b-1 and maintain distances between the first and second supporting plates 911 and 912 and the shaft supporting portions 911a.
The connection unit 914 may be provided much longer than the distance between the first and second supporting plates 911 and 912. That is, since it is applicable to the body unit 910 having various widths and rotational inertia increases as a distance from a center of rotation increases, it is possible to more stably move. Accordingly, spaces occur between the tightening nuts 914a and the first and second supporting plates 911 and 912, which are filled with the first spacers 914b-2. Also, a screw thread to which the hanging unit 915 may be fastened may be provided on an outer circumferential surface of the second spacer 914b-3. When the hanging unit 915 is not fixed to one point of the second spacer 914b-3 and slides, since the stability of the trolley 900 is hindered, the hanging unit 915 and the second spacer 914b-3 may be screw-coupled, thereby preventing sliding. Also, the second spacer 914b-3 may cover a certain part of the outer circumferential surface of the connection shaft member 914b-1 to allow a load of an object supported by the hanging unit 915 to distribute a force transferred to the connection shaft member 914b-1.
The supporting rod 914b may be applied even when the distance between the first and second supporting plates 911 and 912 is changed. For this, the first and second spacers 914b-2 and 914b-3 may be manufactured in various lengths. When the distance between the first supporting plate 911 and the second supporting plate 912 changes or when the length of the connection shaft member 914b-1 changes, the spacers 914b-2 and 914b-3 which are manufactured in various sizes to fit the changed distance may be inserted. Accordingly, regardless of various changes in size and shape of a rail, the trolley 900 may be applied thereto.
To prevent the tightening nut 914a from being released and separate from the connection shaft member 914b-1, a pin member 914c may be inserted into a hole which penetrates the connection shaft member 914b-1. Also, a groove 914a-1 into which the pin member 914c may be inserted is formed on one side of the tightening nut 914a, thereby preventing the tightening nut 914a from rotating while the pin member 914c is being coupled.
The body unit 910 may further include flange portions 913 to protect the wheels. The flange portions 913 are provided on both sides of the first and second supporting plates 911 and 912 and concave inwards to prevent the wheels from colliding with the outside.
The body unit 910 may further include shock absorbing members 916 attached to the flange portions 913. The shock absorbing members 916 may reduce impulses generated when the flange portions 913 collide with obstacles using an elastic material such as rubber. The shock absorbing members 916 are located outermost portions of the trolley 900 and collide first with obstacles. Also, the shock absorbing members 916 in the front and rear and the flange portions 913 protect the wheels located therebetween.
Ring members 917 may be provided on respective one sides of the first and second supporting plates 911 and 912. The ring member 917 may be coupled with a crane (not shown) to easily install the trolley 900. The rail 10 on which the trolley 900 is installed may be generally located at a high place beyond the worker's reach. Accordingly, it is convenient to use the crane to install the trolley 900 on the rail 10 and the ring members 917 form coupling holes in which hooks of the crane hang. Considering stability in installation, the ring members 917 are formed on the first and second supporting plates 911 and 912, respectively. Also, when formed adjacently to the center of the first and second supporting plates 911 and 912, movements may occur while the trolley 900 is being lifted. Accordingly, the ring members 917 may be formed far from the center of the first and second supporting plates 911 and 912. Also, instead of forming four ring members 917 in the front and rear of the first and second supporting plates 911 and 912, as shown in
The wheels may be provided one or more. A plurality of wheels may be disposed two for each of both sides of the rail 10 with gaps therebetween for stable running. In the present embodiment, as shown in
The plurality of wheels may be coupled with one of the first supporting plate 911 and the second supporting plate 912 to be rotatably installed. Also, the respective wheels may be supported by a bearing installed thereinside to smoothly rotate around an outside of a shaft.
The wheels may include rolling wheels 920 and 923 and a supporting wheel 930 which supports the bottom surface of the rail 10.
The rolling wheels 920 and 923 may include driving wheels 920 which roll along the rail 10 due to power transferred from the power transfer unit 940 and driven wheels 923 which does not directly receive the power but roll along the rail 10 together with the driving wheels 920 according to the movement of the body unit 910.
The two driving wheels 920 may be coupled with the first supporting plate 911. The driving wheels 920 may be integrated with driving wheel gears 921, respectively. The driving wheel gears 921 may rotate the driving wheels 920 through the power transferred from the power transfer unit 940. Referring to
The two driven wheels 923 may be coupled with the second supporting plate 912 and passively roll on the rail 10 along the body unit 910 which moves on the rail 10 according to the rolling of the driving wheels 920. In the drawings, the driven wheels 923 are located corresponding to positions of the driving wheels 920. On the other hand, one driven wheel 923 may be located or located alternately with the driving wheels 920. The number and positions of the driven wheels 923 may change as necessary.
To remove instability caused by an imbalance in weight of the trolley 900, the supporting wheel 930 may be coupled with the second supporting plate 912 in which the power transfer unit 940 is not located and may support the bottom of the rail 10. The supporting wheel 930 may be coupled with the first supporting plate 911. However, it may be most effective that the supporting wheel 930 is coupled with the second supporting plate 912 and supports the bottom of the rail 10.
In the trolley 900 according to the fifth embodiment of the present invention, the power transfer unit 940 is located on one side of the body unit 910, thereby generating an imbalance in weight between both sides. The imbalance in weight may make the trolley 900 instable and may separate the driven wheels 923 from the rail 10. Also, fatigue accumulates on the driving wheels 920 and the power transfer unit 940, thereby shortening a repair cycle.
The supporting wheel 930 may be coupled to be changeable in position above and below the body unit 910. For example, the supporting wheel 930 may be fixedly coupled with a supporting wheel bracket 931 and the supporting wheel bracket 931 may be coupled to be changeable in position above and below the body unit 910. The position of the supporting wheel 930 is changed above and below, thereby easily installing the trolley 900 on the rail 10. That is, the supporting wheel 930 is located below while being installed to make a gap from the driven wheels 923 greater than a thickness of the rail 10 and then the supporting wheel 930 is lifted upward and fixed to support the rail 10. Also, the thickness of the rail 10 may change, in which the position of the supporting wheel 930 changes above or below corresponding to various thicknesses of the rail 10.
The power transfer unit 940 may be connected to the body unit 910 in the proceeding direction of the rail 10 and may transfer power for driving or braking of the body unit 910. In the drawings, the power transfer unit 940 is coupled with the first supporting plate 911.
The power transfer unit 940 may include an input shaft 942 which rotates due to power, the output shaft 944 which is connected to the input shaft 942 and drives or brakes the body unit 910, and a locking unit 950 which transfers a rotational force from the input shaft 942 to the output shaft 944 but does not transfer a rotational force from the output shaft 944 to the input shaft 942.
The power transfer unit 940 according to the embodiment of the present invention transfers power for driving. However, it is not limited thereto and the power transfer unit for braking may be included. A device which transfers power for braking has been described with reference to the trolley 500 according to the second embodiment of the present invention and the trolley 502 according to the fourth embodiment of the present invention. However, the power transfer unit which transfers power for braking will not be limited thereto and may include various embodiments.
Hereinafter, the power transfer unit 940 which transfers power for driving will be described. It will be understood that the power transfer unit 940 is a generic term for functional components through which an external force is input to the input shaft 942, passes through the output shaft 944, and operates the driving wheels 920. Accordingly, the power transfer unit 940 may include the input shaft 942, an input gear 943, an output gear 945, the output shaft 944, the power transfer gear 922, and/or the driving wheel gear 921.
The input shaft 942 may be connected to a connection portion 960. The power may be input by a handle unit 970 connected to the connection portion 960. A method in which the body unit 910 runs due to the input power will be described. The input shaft 942 which rotates due to the power rotates the input gear 943. The output shaft 944 is rotated by the output gear 945 which gears into the input gear 943. The output shaft 944 is connected to the power transfer gear 922. The rotation of the output shaft 944 rotates the driving wheel gear 921 which gears into the power transfer gear 922. The driving wheels 920 integrated with the driving wheel gear 921 rotate and roll on the rail 10. The body unit 910 connected to the driving wheels 920 runs on the rail 10. Here, the driven wheels 923 or the supporting wheel 930 connected to the body unit 910 may rotate at the same time.
The input gear 943 and the output gear 945 may be coupled to convert the power input below the body unit 910 into a vertical direction. Since the trolley 900 generally runs along the rail 10 installed on a ceiling or in the air, it is necessary that the worker inputs power below the trolley 900. Since an axial direction of the driving wheels 920 is generally horizontal to the ground, a gear assembly which can converts the power input below the body unit 910 into a vertical direction may be necessary.
The locking unit 950 may include an active rotating body 952 which rotates due to the input power and a passive rotating body 953 which is coupled to rotate in the same direction as a rotational direction of the active rotating body 952 and is coupled with one of the input shaft 942 and the output shaft 944.
In the locking unit 950, the passive rotating body 953 rotates due to the rotation of the active rotating body 952 and rotates one of the output shaft 944 and the input shaft 942 while the passive rotating body 953 is not rotating even when a rotational force is applied to one of the output shaft 944 and the input shaft 942 due to an external force. Hereinafter, referring to
The active rotating body 952 and the passive rotating body 953 may be coupled through coupling between a stud member 953a and a stud hole 952a. In
The active rotating body 952 may be coupled with the output gear 945, thereby performing corotation. Also, the passive rotating body 953 may be coupled with the output shaft 944, thereby performing corotation. The passive rotating body 953 and the output shaft 944 may be key-coupled. That is, a key 956 may be inserted between a key groove 953c provided on the passive rotating body 953 and a key groove 944a provided on the output shaft 944.
The locking member 954 may be disposed between the housing 951 and a guide surface 953b of the passive rotating body 953 and may have a cylindrical shape. The guide surface 953b may have a greater radius curvature than an internal radius curvature of the housing 951. Accordingly, a distance between the guide surface 953b and the housing 951 becomes smaller as being far from the center of the guide surface 953b. The locking member 954 may have a diameter within a range between a maximum value and a minimum value of the distance between the guide surface 953b and the housing 951. Accordingly, when the locking member 954 goes toward an outer area of the guide surface 953b, an insertion occurs between the housing 951 and the guide surface 953b. When the locking member 954 goes toward the center of the guide surface 953b, it is possible to roll without any insertion.
When the locking member 954 is provided on one side of an outer portion of the guide surface 953b, the passive rotating body 953 may rotate in only one direction. The locking member 954 generates the insertion when the passive rotating body 953 rotates in one direction, thereby preventing the rotation of the passive rotating body 953. For convenience of description, it is assumed that only one locking member 954 exists. When the passive rotating body 953 rotates clockwise, the locking member 954 rotates counterclockwise due to friction with the guide surface 953b. Accordingly, the locking member 954 may receive a force of rolling toward the center of the guide surface 953b and the passive rotating body 953 may freely rotate.
On the contrary, when the passive rotating body 953 rotates counterclockwise, the locking member 954 rotates clockwise due to friction with the guide surface 953b. Accordingly, the locking member 954 may receive a force of rolling toward the outer area of the guide surface 953b to be inserted between the guide surface 953b and the housing 951 and the passive rotating body 953 may not rotate. Hereinafter, a clockwise direction in which the passive rotating body 953 is rotatable will be indicated as a rotational direction and a counterclockwise direction in which the passive rotating body 953 is not rotatable will be indicated as an insertion direction.
The unlocking member 952b may be coupled to protrude from a surface of the active rotating body 952 which faces the passive rotating body 953. The unlocking member 952b is located on an outer area of the locking member 954 and rotates together with the rotation of the active rotating body 952 at the same time, thereby pushing the locking member 954 toward the center of the guide surface 953b. Accordingly, the locking member 954 may not be inserted between the housing 951 and the guide surface 953b and the passive rotating body 953 may freely rotate.
The unlocking member 952b allows the passive rotating body 953 to rotate when the active rotating body 952 rotates even in the insertion direction. Accordingly, it is possible to operate as one-way clutch. In other words, when the active rotating body 952 rotates in the insertion direction, the unlocking member 952b moves the locking member 954 in a direction not be inserted, that is, toward the center of the guide surface 953b, thereby allowing the passive rotating body 953 to rotate. However, when a rotational force is applied to the output shaft 944 due to an external force and the passive rotating body 953 intends to rotate in the insertion direction, since the locking member 954 is inserted between the housing 951, rotation is impossible.
The locking member 954 and the unlocking member 952b may be provided on both outer areas of the guide surface 953b as one pair. This is for allowing the passive rotating body 953 to bidirectionally rotate. As described above, an operation in a case in which the locking member 954 and the unlocking member 952b are provided only in one outer area of the guide surface 953b has been described. Hereinafter, an operation of the locking unit 950 when the locking member 954 and the unlocking member 952b are located in both outer areas of the guide surface 953b will be described with reference to
When the active rotating body 952 rotates, regardless of rotating clockwise or counterclockwise, the passive rotating body 953 may rotate together with the active rotating body 952.
On the contrary, when the passive rotating body 953 intends to rotate due to an external force applied to the output shaft 944, since any one of the two locking members 954-1 and 954-2 is inserted regardless of a direction of rotation, the passive rotating body 953 may not rotate. Accordingly, no matter in which direction power is input, the locking unit 950 may drive the body unit 910 by rotating the output shaft 944. However, when a rotational force is applied to the output shaft 944 through applying an external force to the body unit 910, since the passive rotating body 953 is impossible to rotate, the body unit 910 does not move.
The active rotating body 952 and the passive rotating body 953 may be coupled in such a way that a space occurs when rotation is performed. The space means a rotation angle at which the active rotating body 952 may independently rotate from the passive rotating body 953. To allow the unlocking member 952b to push the locking member 954 to a place in which insertion does not occur, an affordable rotation angle to allow the unlocking member 952b to move is necessary. Within the space, the active rotating body 952 may move independently from the passive rotating body 953. When the passive rotating body 953 is coupled with the active rotating body 952 without space, there is no room to allow the unlocking member 952b to move due to the locking member 954. That is, while the active rotating body 952 is rotating as a rotation angle separate from the passive rotating body 953, the unlocking member 952b moves the locking member 954 to the place in which insertion does not occur, thereby allowing the passive rotating body 953 to rotate.
As an example of generating the space, the stud hole 952a accommodates the stud member 953a while being separate therefrom, thereby coupling the active rotating body 952 with the passive rotating body 953. The passive rotating body 953 is allowed to rotate together with the rotation of the active rotating body 952 with the space as a distance between the stud member 953a and the stud hole 952a. That is, for the space between the active rotating body 952 and the passive rotating body 953, an inner diameter of the stud hole 952a may be greater than an outer diameter of the stud member 953a.
The locking unit 950 may further include an elastic member 955 which pushes the locking member 954 to a place in which insertion occurs. To prevent the passive rotating body 953 from rotating due to the output shaft 944, it is necessary that the locking member 954 is in an insertion state. When the locking member 954 is not located in the insertion state, it is impossible to prevent the passive rotating body 953 from rotating until the locking member 954 is located in the insertion state.
Also, as shown in
Next, advantages obtained by using the locking unit 950 will be described. As described above, the power transfer unit 940 according to the embodiment of the present invention may transfer power for driving or braking of the body unit 910.
The trolley 900 may be installed in a place in which pitching may occur such as a vessel. Also, the rail 10 may not be always horizontal but may be installed with a certain gradient. In this case, a force is generated by potential energy in the trolley 900. In addition, various external forces may be generated to apply a force to the trolley 900.
When the power transfer unit 940 transfers power for driving or when the power transferred from the power transfer unit 940 is cut off, the trolley 900 is in a brake state. When the power for driving is transferred, a rotational force is transferred to the output shaft 944 through the input shaft 942, the input gear 943, the active rotating body 952, and the passive rotating body 953, and the driving wheels 920 start rolling to allow the trolley 900 to run on the rail 10. However, when the power is cut off, the trolley 900 may maintain a standstill. When the driving wheels 920 intend to passively roll due to a gradient, the locking unit 950 prevents the output shaft 944 from rotating. Accordingly, it is possible to provide the trolley 900 which can maintain a brake state without any additional brake device.
When a power transfer unit (not shown) transfers power for braking, the locking unit 950 maintains the brake state. As an example, when a braking operation is performed by a pad which applies friction to one of the wheels or the rail 10, the trolley is in an instable state when there is a certain change in the brake state due to an external force, that is, when braking is loosened. The locking unit 950 may prevent a certain change in the braking state by preventing rotation of the output shaft 944.
Next, referring to
The case 941 may include a base portion 941a and a cover portion 941b. A bottom of the base portion 941a may be penetrated by the input shaft 942 and may be connected to a body 961 of the connection portion 960, thereby supporting the connection portion 960. Also, one side of the base portion 941a may be coupled with the first supporting plate 911. Here, the base portion 941a may be coupled with the first supporting plate 911 to be slidable up and down. The output shaft 944 and the output gear 945 are fixedly supported by the first supporting plate 911, and the input shaft 942 and the input gear 943 are fixedly supported by the base portion 941a. Here, since the output gear 945 and the input gear 943 are coupled with each other, when disassembling to maintain or repair, the output gear 945 and the input gear 943 may be separated into top and bottom to be disassembled. When an external force is transferred while the two gears 943 and 945 are being coupled with each other, teeth thereof may be damaged.
That is, a slit hole in which a bolt is vertically movable may be formed in the base portion 941a and a through hole 911c (refer to
The base portion 941a may have four open sides except a surface in contact with the first supporting plate 911 and a bottom surface. That is, it is unnecessary to completely disassemble the case 941 to maintain or repair the power transfer unit 940. The power transfer unit 940 may be exposed through by merely separating the cover portion 941b. Here, sides of the base portion 941a may be partially provided for coupling between the cover portion 941b and the base portion 941a and the cover portion 941b and the base portion 941a may be coupled with each other through bolting.
The trolley 900 according to the fifth embodiment of the present invention may further include the handle unit 970 for inputting power and the connection portion 960 detachably connected to the handle unit 970. As described above, there is a limitation in the general trolley 9 in which it is impossible to remove the chains 2 for driving or braking as unnecessary. Accordingly, in the embodiment of the present invention, the handle unit 970 and the connection portion 960 detachably connected to input power for driving or braking may be used.
One end of the connection portion 960 is connected to the handle unit 970 and the other end is connected to the power transfer unit 940. The one end of the connection portion 960 is connected to a connection protrusion 972 provided on an end of a handle bar 971, thereby transferring a rotational force of the handle unit 970 to the power transfer unit 940. For this, the connection portion 960 may include the body 961 and a base 962.
The body 961 may provide a rotation space 961a in which the connection protrusion 972 is rotatable, and a top thereof may be connected to the input shaft 942 and a bottom thereof may be connected to the base 962. The base 962 may include a through groove 963 into which the connection protrusion 972 is inserted and a mounting groove 964 on which the connection protrusion 972 is mounted.
Also, the through groove 963 and the mounting groove 964 are provided to intersect at 90 degrees in
The connection protrusion 972 may be inserted into the body 961 through the through groove 963 and then may rotate at 90 degrees in the rotation space 961a, thereby being mounted on the mounting groove 964. When the handle bar 971 rotates after the connection protrusion 972 is mounted on the mounting groove 964, a rotational force of the handle unit 970 is intactly transferred to the connection portion 960. That is, the rotational force is allowed to pass through the base 962 and the body 961 and to rotate the input shaft 942.
Also, a shape of the mounting groove 964 is not limited to a concave shape as shown in
The connection portion 960 may include a guide protrusion 966 to allow the connection protrusion 972 to be easily mounted on the mounting groove 964. The guide protrusion 966 includes a slant guide surface 953b, thereby guiding the connection protrusion 972 to be mounted on the mounting groove 964 even when the connection protrusion 972 passes through the through groove 963 and does not completely rotate at 90 degrees. The guide protrusion 966 may be provided on the base 962 between the through groove 963 and the mounting groove 964.
The connection portion 960 may include a guide member 965 which guides an end of the handle unit 970 to be easily inserted. The guide member 965 may be provided below the body 961 and may include a shape whose opening becomes wider toward an end thereof. Accordingly, even when the connection protrusion 972 is coupled with the through groove 963 not to completely fit but is inserted into the opening of the guide member 965, the connection protrusion 972 may be guided along the guide member 965 and may be inserted into the through groove 963.
Not shown in the drawings, the connection portion 960 may include an elastic supporting member (not shown) which applies a force to the connection protrusion 972 toward the through groove 963 to prevent the connection protrusion 972 from being separated from the mounting groove 964. The elastic supporting member may include a supporting surface and an elastic member and may pressurize the connection protrusion 972 while being mounted to prevent the connection protrusion 972 from being separated from the mounting groove 964, thereby transferring a rotational force to the connection portion 960 without any loss.
The handle unit 970 may be included in the trolley 900 or may be a device separately produced. Also, the handle unit 970 is not limited to being used for the trolley 900 according to the fifth embodiment of the present invention but includes being used for another apparatus including the connection portion 960. Hereinafter, the handle unit 970 as an individual device will be described.
The handle unit 970 may be detachably connected to input power for driving or braking to the trolley 900 which moves along the rail 10. Also, the handle unit 970 may include the handle bar 971 which includes a joint portion 973 and a connection protrusion 972 connected to the connection portion 960 of the trolley 900.
Since it is necessary that the handle unit 970 is connected to the connection portion 960 of the general trolley 9 located in a higher place than a working place of the worker, the handle unit 970 may be provided as a long bar. In the general trolley 9, since one of a driving unit or a brake unit is operated using the chains 2 which droop, the worker works while pulling the chains 2 which droop. However, this method needs a great force and the safety of the worker is threatened by the chains 2 which swing. Using the handle unit 970 detachably connected, it is possible to transfer power to the power transfer unit 940 while removing the chains 2.
Also, the chains 2 rotate the input shaft 942 through a pulling force of the worker. On the other hand, the handle unit 970 may allow the worker to directly rotate the handle bar 971 or may connect the handle bar 971 with a driver to rotate. This method of inputting a driving force, compared with a case of using the general chains 2, is safer and may easily provide an driving force through less power. In this case, to easily rotate the handle unit 970, as shown in
The handle unit 970 is basically to transfer power for driving or braking and may be used when the worker moves the trolley 900. That is, the worker grips the handle unit 970 connected to the connection portion 960 and applies a pulling or pushing force, thereby moving the trolley 900 on the rail 10.
The handle bar 971 may include a bent portion 973. The bent portion 973 includes a portion which is crooked or bent by a joint. The bent portion 973 includes a single directional or multidirectional joint portion. The worker may rotate the handle bar 971 in various position or postures using the handle bar 971 which is bendable. Also, when the worker applies a force to the handle unit 970 to move the trolley 900, the handle unit 970 without the bent portion 973 applies great torque to the input shaft 942 and the input shaft 942 may be damaged as fatigue accumulates. The torque is proportional to a length from the input shaft 942 to a bent portion. Accordingly, when the length between the input shaft 942 and the bent portion decreases, the torque becomes smaller and the fatigue applied to the input shaft 942 is reduced.
The bent portion 973 of the handle bar 971 may be used even when there is present an obstacle in a proceeding direction. Particularly, when a multidirectional joint portion using a universal joint is included, it is possible to proceed while avoiding obstacles using spaces in all directions.
The elastic member 973b allows the handle bar 971 to keep an I-shape despite the joint portion 973a. Accordingly, the worker may easily connect the connection protrusion 972 to the connection portion 960. Also, the handle bar 971 is prevented from being bent by pitching of a vessel, etc., thereby providing the safety of the worker.
The joint portion 973a includes a first joint member 973a1, a second joint member 973a2, and an insertion member 973a3 and two pins 973a4 and 973a5 which are inserted between the two joint members 973a1 and 973a2 to allow the two joint members 973a1 and 973a2 to be rotatable but not to be separated. The first and second joint members 973a1 and 973a2 include flange portions for coupling on both sides, in which through holes for being coupled with the pins 973a4 and 973a5 are formed. The two joint members 973a1 and 973a2 are coupled with each other at 90 degrees, and the insertion member 973a3 is disposed between the two joint members 973a1 and 973a2. The insertion member 973a3 includes through holes which intersect at 90 degrees. The respective pins 973a4 and 973a5 are coupled with the through holes.
When the two joint members 973a1 and 973a2 are coupled with one shaft, the insertion member 973a3 is unnecessary but rotation is allowed on only one plane. However, like the joint portion 973a according the embodiment of the present invention, when the two joint members 973a1 and 973a2 are coupled using two rotational shafts 973a4 and 973a5 which intersect at 90 degrees, rotation is allowed on two planes. This not only means that the first handle bar 971-1 and the second handle bar 971-2 are bendable in any direction but also means that a rotational force may be transferred while the two handle bars 971-1 and 971-2 are being bent.
The rotation cover may include a first rotation cover 975-1 rotatably provided on the handle 974 and a second rotation cover 975-2 rotatably provided on the second handle bar 971-2. The handle 974 may include supporting jaws 974a and 974b which may support a top and bottom of the first rotation cover 975-1, and the second handle bar 971-2 may include supporting jaws 971-2a and 971-2b which may support a top and bottom of the second rotation cover 975-2. The rotation cover may rotate relatively to one of the handle 974 and the second handle bar 971-2. Being relatively rotatable means maintaining a standstill despite rotations of the handle 974 and the second handle bar 971-2.
Next, referring to
Since the handle bar 971 maintains an I-shape due to the elastic member 973b, it is easy to dispose the connection protrusion 972 inside an opening of the guide member 965. The connection protrusion 972 may be guided by the guide member 965 to pass through the through groove 963 and enter the rotation space 961a, and then may rotate at degrees at which the through groove 963 and the mounting groove 964 get across each other (90 degrees in
In addition, functions of the rotation covers 975-1 and 975-2 when the rotational force is applied will be described. The rotation cover allows the user not to turn hands according to rotations of the handle 974 and the handle bar 971 when the user inputs the rotational force while gripping the handle 974 and the handle bar 971 with hands. That is, while the user is gripping the first rotation cover 975-1 and the second rotation cover 975-2 with both hands and an arm which grips the second rotation cover 975-2 is fixed to become a rotational axis, the user inputs the rotational force by rotating an arm which grips the first rotation cover 975-1 around the rotational axis. According to the rotational force input by the user, the handle 974 and the handle bar 971 rotate. However, since the rotation covers 975-1 and 975-2 may stand still regardless of rotations thereof, it is unnecessary that the user inconveniently rotates the hand in a reverse direction of the rotational direction or it is possible to prevent a palm from being rubbed.
A bent portion may include a multidirectional joint portion 983 and a cover member 985 which may open or cover the joint portion 983. The cover member 985 according to another embodiment corresponds to the elastic member 973b of
The handle bar 981 may further include an elastic supporting portion 987 which provides an elastic force to allow the cover member 985 to cover the joint portion 983. When the cover member 985 moves downward to expose the joint portion 983, the elastic supporting portion 987 applies the elastic force to allow the cover member 985 to return to an original position to cover the joint portion 983. Also, a stopping jaw 985a which is provided above the joint portion 983 may restrict an upward movement of the cover member 985 by supporting a top end of the cover member 985.
The handle bar 981 may further include a cover member fixing portion 986 which may fix the cover member 985 while exposing the joint portion 983. The cover member fixing portion 986 may include a fixing member 986b which protrudes from a bottom end of the cover member 985 and a moving member 986a which is provided below the elastic supporting portion 987, is pivotable, and is coupled with the fixing member 986b. Here, the fixing member 986b and the moving member 986a may be switched in locations thereof.
As shown in
Referring to
Also, the handle unit 970 may not only be changed in length but also be fixed while being changed. A fixing protrusion 976b may be installed on the first step handle bar 976a to be inserted thereinto and protrudes from the outer circumferential surface. The fixing protrusion 976b may be elastically supported to maintain a state of protruding from the first step handle bar 976a. When the first step handle bar 976a is inserted into the second step handle bar 976c, the fixing protrusion 976b is hung on a hanging hole (not shown) provided on the second step handle bar 976c. Here, a surface of the fixing protrusion 976b which faces the second step handle bar 976c is provided as a curve to be easily inserted and a facing surface may be provided as a slant shape to easily maintain a state of being hung on the hanging hole of the second step handle bar 976c.
When the worker directly inputs a rotational force, a maintenance time for inputting power may be short, a rotational speed may be low, and the rotational force may be small. On the other hand, when an additional driver D is used, an input maintenance time is long, a rotational speed is high, and a rotational force is great. A socket 977a into which a wrench W of the driver D can be inserted may be provided on a bottom of the second handle bar 971-2. The socket 977a has a shape corresponding to an outer surface of the wrench W. For example, when a hexagonal wrench W is used, the socket 977a also includes a hexagonal groove.
The socket 977a not only may be integrated with the second handle bar 971-2 but also may be formed in an additional socket member 977b. The socket member 977b may have the sockets 977a in various sizes or shapes to correspond to various sizes and shapes of the wrench W and may be detachably coupled with the second handle bar 971-2. Also, to prevent the socket member 977b from independently rotating from the second handle bar 971-2 while being inserted into the second handle bar 971-2, a hanging portion 977c may be provided on an outer surface of the socket member 977b.
Also, although the wrench W is provided on the driver D and the socket 977a is formed in the second handle bar 971-2 in the drawing, a socket (not shown) may be provided in the driver D and a wrench (not shown) may protrude from a bottom surface of the second handle bar 971-2.
When the socket 977a is formed on the bottom of the second handle bar 971-2, rotational axes are in parallel, thereby preventing rotation of the driver D. Here, according to the rotation of the second handle bar 971-2, the handle 974 connected thereto also rotates together. The handle 974 rotates around the second handle bar 971-2 as a rotational axis. Here, since the handle 974 more protrudes toward the worker than a position of the socket 977a, the handle 974 may be a risk to the worker while rotating.
Accordingly, the handle unit 970 according to the embodiment of the present invention may include a rotation portion 978 which is able to rotate the handle 974. The handle 974 may rotate at 180 degrees due to the rotation portion 978 and a position thereof may be shifted to be far from a direction which protrudes toward the worker due to the rotation. Although not shown in the drawings, the rotation portion 978 may include a fixing device which can fix a rotation state. This is to prevent the handle 974 from rotationally moving toward the worker while rotating.
While one or more embodiments of the present invention have been described with reference to the figures, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the following claims.
Number | Date | Country | Kind |
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10-2013-0008942 | Jan 2013 | KR | national |
10-2013-0008945 | Jan 2013 | KR | national |
10-2013-0117976 | Oct 2013 | KR | national |
10-2013-0118001 | Oct 2013 | KR | national |
10-2013-0139425 | Nov 2013 | KR | national |
10-2013-0139426 | Nov 2013 | KR | national |
Filing Document | Filing Date | Country | Kind |
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PCT/KR2014/000715 | 1/24/2014 | WO | 00 |