Patent Application
20240300067
This application claims the benefit of Chinese Patent Application Number 202310229319.0 filed on Mar. 10, 2023, the entirety of which is incorporated by reference.
The disclosure relates to a machining device, such as a wheel sander, attachment of the machining device, and a tip tool mounting structure for the machining device.
There has been known a wheel sander that includes a shaft portion 110 to which a wheel-shaped tool 104 is mounted as disclosed in EP 2548697 A.
In the wheel sander, the shaft portion 110 includes ridges 135. A hole 112 of the tool 104 includes recesses 136.
When the tool 104 is mounted to the shaft portion 110, the ridges 135 enter the recesses 136. In addition, a holding member 124 is mounted to a distal end portion of the shaft portion 110. At this time, a user screws the holding member 124 in around a long axis 122 of the shaft portion 110. When the mounting is completed, the positions in a rotation direction of protrusions 132 of the holding member 124 match the ridges 135.
In the mounting of the tool 104 described above, the user must twist the holding member 124 while holding the tool 104 so as not to rotate the tool 104. Accordingly, there is room for improvement in the workability related to the mounting of the tool 104, that is, a tip tool.
This specification discloses a tip tool mounting structure for a machining device. The tip tool mounting structure for the machining device may be integrated with a spindle and include a shaft portion on which a polishing wheel is mounted. The tip tool mounting structure for the machining device may include a holding member rotatably disposed at a distal end portion of the shaft portion. The shaft portion may have a ridge extending in a longitudinal direction and projecting outward in a radial direction. The holding member may have a protrusion projecting outward in the radial direction. The holding member may switch between an attached and detached state and a fixed state by the rotation. The attached and detached state is a state in which the protrusion overlaps with the ridge in the longitudinal direction, and the fixed state is a state in which the protrusion does not overlap with the ridge in the longitudinal direction. The holding member may be configured to be temporarily fixed in the attached and detached state. The temporary fixation of the holding member may be automatically released by a movement of the polishing wheel to an opposite distal end side in the longitudinal direction.
With the machining device, the attachment, and the tip tool mounting structure of the disclosure, the workability related to the mounting of a tip tool is improved.
In one embodiment of the disclosure, one of a shaft portion and a holding member may include a protruding portion, and the other one may include a first flute portion. The holding member may be temporarily fixed in an attached and detached state by entry of the protruding portion into the first flute portion. In this case, the temporary fixation is configured more simply.
In one embodiment of the disclosure, a second flute portion may be disposed together with the first flute portion. When the holding member is in a fixed state, the protruding portion may enter the second flute portion. In this case, in addition to the temporary fixation, the fixation of a tip tool becomes more stable.
In one embodiment of the disclosure, the shaft portion may have a shaft body and a sleeve. The sleeve may have the protruding portion. The sleeve may be movable in a longitudinal direction with respect to the shaft body. The sleeve may be biased to a distal end side with respect to the shaft body by a compression spring. The holding member may have the first flute portion and the second flute portion. The holding member may be biased in a rotation direction in which the holding member shifts from the attached and detached state to the fixed state with respect to the shaft body by a torsion spring. The holding member in the attached and detached state may rotate toward the fixed state by a movement of the sleeve to an opposite distal end side with respect to the shaft body to cause the protruding portion to disengage from the first flute portion. In this case, the fixed state is automatically reached, and a tip tool mounting structure, which becomes more stable in the fixed state and the attached and detached state, is configured more simply.
In one embodiment of the disclosure, a ring may be disposed between the shaft body and the sleeve. The ring may be in contact with an outer surface of the shaft body and an inner surface of the sleeve. In this case, the intrusion of dust is more suppressed.
In one embodiment of the disclosure, the shaft portion may have the protruding portion. The holding member may have the first flute portion and the second flute portion. The holding member may be biased to an opposite distal end side with respect to the shaft portion. The holding member may be biased in a rotation direction in which the holding member shifts from the attached and detached state to the fixed state with respect to the shaft portion. The holding member in the attached and detached state may rotate toward the fixed state by moving to a distal end side with respect to the shaft portion to cause the protruding portion to disengage from the first flute portion. In this case, the fixed state is automatically reached, and the tip tool mounting structure, which becomes more stable in the fixed state and the attached and detached state, is configured more simply.
In one embodiment of the disclosure, the second flute portion may have an inclined surface portion arranged at the first flute portion side. In this case, the rotation from the attached and detached state to the fixed state becomes smoother.
In one embodiment of the disclosure, a plurality of ridges may be disposed. A plurality of protrusions may be disposed. In this case, the fixation of a tip tool becomes more stable.
In addition, the specification discloses an attachment of a machining device. The attachment may have the above-described tip tool mounting structure for a machining device.
Furthermore, the specification discloses a machining device. The machining device may have the above-described tip tool mounting structure for a machining device.
Embodiments of the disclosure are described below.
The following describes embodiments of the disclosure based on the drawings as appropriate. The description includes modification examples of the embodiments. The disclosure is not limited to the embodiments and the modification examples.
The front, rear, up, down, right, and left in the embodiments and the modification examples are defined for convenience of explanation and may change depending on, for example, at least any of a work condition and movement of members.
The wheel sander 1 includes a main body portion 2, a handle portion 4, and a guiding portion 6. The guiding portion 6 can also be called a parallel ruler. The guiding portion 6 may be a component of the main body portion 2 or may be a component of the handle portion 4.
In
The main body portion 2 has a columnar shape with a center axis in a front-rear direction.
The main body portion 2 includes a housing 10, a motor 12, a fan 14, a motor bearing 15, a battery mounting portion 16, a battery 18, a controller 20, a connector 22, a speed adjustment dial 24, a main switch 26, a power transmission portion 28, a shaft lock portion 29, a spindle 30 as an output shaft, a tip tool mounting portion 31, and a polishing wheel 32 as a tip tool.
In the main body portion 2, the battery 18, the battery mounting portion 16, the controller 20, the connector 22, the motor 12, the fan 14, the power transmission portion 28, and the spindle 30 are arranged in this order from the rear.
At least one of the battery 18 and the polishing wheel 32 may be a component independent of the main body portion 2 or the wheel sander 1 instead of being a component of the main body portion 2 or the wheel sander 1. In addition, the spindle 30 may be a component of the power transmission portion 28, and the tip tool mounting portion 31 may be treated as an output shaft. Furthermore, the spindle 30 and the tip tool mounting portion 31 may be combined to be an output portion.
The housing 10 constitutes an outer wall of the main body portion 2.
The housing 10 holds various members directly or indirectly.
The housing 10 includes a motor housing 40, a fan case 42, a gear housing 44, and a bearing box 45.
The motor housing 40 is made of plastic. The motor housing 40 is halved and includes a left motor housing 40L and a right motor housing 40R. The left motor housing 40L includes a plurality of screw boss portions. The right motor housing 40R includes screw-hole portions 40P. The screw-hole portions 40P have screw-holes corresponding to the screw boss portions. The left motor housing 40L and the right motor housing 40R are joined by screws 46 that enter the screw-hole portions 40P and the screw boss portions.
The motor housing 40 has a tubular shape. The motor housing 40 includes a front end portion that forms a front opening portion opening to a front. The motor housing 40 includes a rear end portion that forms a rear opening portion opening to a rear.
The motor housing 40 includes a center portion in the front-rear direction that forms a grip portion G configured to be gripped by a user.
The fan case 42 is made of aluminum die cast alloy. The fan case 42 has a ring shape. The fan case 42 opens to the front and rear.
The fan case 42 includes a plurality of exhaust vents 47. The exhaust vents 47 are arranged in an upper left portion, an upper right portion, a lower left portion, and a lower right portion of the fan case 42.
The gear housing 44 is made of aluminum die cast alloy. The gear housing 44 is a bell-shaped member having a front portion reduced in diameter in comparison to a rear portion. The gear housing 44 includes a rear end portion opening to the rear. The gear housing 44 includes a left front portion opening to a left.
The gear housing 44 is fixed to the motor housing 40 via the fan case 42. The rear opening portion of the fan case 42 is joined to the front opening portion of the motor housing 40. The rear opening portion of the gear housing 44 is joined to the front opening portion of the fan case 42. The gear housing 44 is fixed to the fan case 42 with a plurality of (four) screws 48 that extend forward and rearward. The screws 48 are arranged at the upper right, lower right, upper left, and lower left at the fan case 42 and the rear portions of the gear housing 44. Each screw 48 is inserted rearward from the front side.
The bearing box 45 is made of aluminum die cast alloy. The bearing box 45 has a cylindrical shape including a flange portion. A center axis direction of the bearing box 45 extends leftward and rightward.
The bearing box 45 is integrally fixed to the gear housing 44 with a plurality of (four) screws 49 in a right-left direction. The screws 49 are arranged at the upper front, lower front, upper rear, and lower rear of the flange portion of the bearing box 45.
The bearing box 45 includes a right opening portion communicated with a left front opening portion of the gear housing 44.
The housing 10 is variously changeable. For example, in the motor housing 40, a front portion and a rear portion may be separate bodies that can be combined with one another. In the halved motor housing 40, at least one of the sizes and shapes may significantly differ between the left motor housing 40L and the right motor housing 40R. Furthermore, the left motor housing 40L and the right motor housing 40R may be combined by means other than the screws 46 using, for example, a locking portion, such as a pawl, and a locked portion, such as a pawl hole. The gear housing 44 may be halved. The fan case 42 may be omitted by being integrated with the motor housing 40 or the gear housing 44. Materials of various parts in the housing 10 may be changed. At least one of the quantity and arrangement of the exhaust vents 47 may be changed as appropriate.
The motor 12 is a brushless motor, which is a DC motor.
The motor 12 includes a motor shaft 50.
The motor shaft 50 rotates around its own center axis. The motor shaft 50 extends forward and rearward.
The motor shaft 50 includes a front end portion at which a pinion portion 52 is formed.
The fan 14 is fixed integrally with the motor shaft 50.
The fan 14 is a centrifugal fan. It should be noted that another fan, such as an axial fan, may be used as the fan 14.
The exhaust vents 47 of the fan case 42 are arranged at an outer side in a radial direction of the fan 14.
The motor bearing 15 rotatably supports the motor shaft 50. The motor bearing 15 is arranged between the fan 14 and the pinion portion 52. The motor bearing 15 is arranged at the front side of the fan 14. The motor bearing 15 includes an outer race held onto the fan case 42.
The battery mounting portion 16 is arranged at the rear end portion of the main body portion 2. The battery mounting portion 16 expands upward, downward, leftward, and rightward with respect to a part at the front part.
The battery 18 is fitted to the battery mounting portion 16. The battery mounting portion 16 includes a main body portion side terminal that is connected to a terminal of the battery 18. The main body portion side terminal is arranged in a rear opening portion of the main body portion 2.
The battery 18 is fitted at the rear side of the battery mounting portion 16. The battery 18 is fitted by sliding downward from an upper side of the battery mounting portion 16. The slide-fitting direction of the battery 18 may be a direction other than the direction downward from the upper side. In addition, the battery 18 may be fitted in a manner other than the slide-fitting.
The battery 18 is an 18 volt (V) lithium-ion battery. The battery 18 contains eight cells not illustrated in a battery case made of plastic. The cell has an axially long columnar shape that is oriented in the right-left direction when the battery 18 is fitted. The battery 18 retains electric power to drive the motor 12. Any lithium-ion battery of 10.8 V, 14.4 V, 25.2 V, 28 V, 36 V, or the like may be used as the battery 18. A lithium-ion battery of a voltage less than 10.8 V or exceeding 36 V may be used as the battery 18. A battery of another kind may be used as the battery 18. A plurality of batteries 18 may be used.
The controller 20 is held inside the battery mounting portion 16.
The controller 20 controls the motor 12. The motor 12 is electrically connected to the controller 20 via the connector 22. Furthermore, the main body portion side terminal of the battery mounting portion 16 is electrically connected to the controller 20.
Moreover, the speed adjustment dial 24 and the main switch 26 are each electrically connected to the controller 20.
The connector 22 is placed in a lead wire (not illustrated) connecting between the motor 12 and the controller 20.
The connector 22 can be disconnected in a reconnectable manner. When only one of the motor 12 and the controller 20 needs to be replaced due to a fault and the like, the one can be easily replaced by disconnecting the connector 22.
The speed adjustment dial 24 is arranged at an upper portion of the rear end portion of the motor housing 40.
The speed adjustment dial 24 expands upward, downward, leftward, and rightward and is rotatable around a virtual axis in the front-rear direction.
The speed adjustment dial 24 has an exposed upper end portion.
The main switch 26 is arranged at a front-end upper portion of the motor housing 40.
The main switch 26 has an exposed upper portion. The main switch 26 is slidable forward and rearward from a rearward OFF POSITION to a MAXIMUM ON POSITION ahead of the OFF POSITION.
The main switch 26 is switched on after a predetermined play when a user performs a forward slide operation from the OFF POSITION.
It should be noted that when the main switch 26 is operated further forward from the on state, a state of a signal issued may be changed according to the amount of forward operation. In this case, the speed adjustment dial 24 may be omitted, and the controller 20 may change a rotation speed of the motor 12 according to the state of the signal of the main switch 26. The controller 20 may control the motor 12 such that the more the main switch 26 is operated forward, the more the rotation speed of the motor 12 increases. In addition, the play may be omitted, and the main switch 26 may be switched on soon after starting the forward operation.
The power transmission portion 28 transmits the power of the motor 12 to the polishing wheel 32 via the spindle 30. The spindle 30 has a columnar shape. The spindle 30 extends leftward and rightward.
The power transmission portion 28 includes a bevel gear 60, a right spindle bearing 62, a left spindle bearing 64, and a washer 66.
The power transmission portion 28 is arranged in the gear housing 44.
The bevel gear 60 is integrally fixed to the spindle 30. The bevel gear 60 is arranged around an upper portion of the spindle 30. The bevel gear 60 is arranged in the left front opening portion of the gear housing 44.
The bevel gear 60 engages with the pinion portion 52.
The bevel gear 60 decelerates the rotation of the motor shaft 50 and transfers the rotation to the spindle 30.
The bevel gear 60 includes a plurality of (three) locking holes 60K. Each locking hole 60K extends leftward from a right face of the bevel gear 60. Each locking hole 60K is not through the left end. The locking holes 60K are arranged at regular intervals in a circumferential direction when viewed from a right side to the left. Each locking hole 60K has an identical distance with respect to the spindle 30.
The right spindle bearing 62 is arranged around a right end portion of the spindle 30.
The right spindle bearing 62 supports the spindle 30 rotatably around a center axis thereof.
The right spindle bearing 62 is arranged at the right side of the bevel gear 60. The right spindle bearing 62 is held onto the gear housing 44.
The right spindle bearing 62 is arranged at the front side of the motor shaft 50.
The left spindle bearing 64 is arranged around a center portion of the spindle 30.
The left spindle bearing 64 supports the spindle 30 rotatably around the center axis thereof.
The left spindle bearing 64 is arranged at a left side of the bevel gear 60. The left spindle bearing 64 is held onto the bearing box 45.
The washer 66 is arranged at the left side of the left spindle bearing 64.
The washer 66 is arranged between an inner race of the left spindle bearing 64 and a large diameter portion of the center portion of the spindle 30.
The spindle 30 includes a right portion arranged in the gear housing 44.
The center portion of the spindle 30 is arranged in the bearing box 45.
The spindle 30 includes a left portion, that is, a distal end portion protruding leftward from a left opening portion of the bearing box 45.
The shaft lock portion 29 is arranged at a right lower portion of the gear housing 44.
The shaft lock portion 29 includes a shaft lock button 70, locking pins 72, and a coil spring (not illustrated) as an elastic body.
The shaft lock button 70 has a plate shape and expands forward, rearward, upward, and downward. The shaft lock button 70 includes a right portion exposed from the gear housing 44.
The locking pins 72 have a columnar shape. The locking pins 72 extend leftward from a left portion of the shaft lock button 70. The locking pins 72 are fixed integrally with the shaft lock button 70.
The coil spring is interposed between the gear housing 44 and the shaft lock button 70. The coil spring biases the shaft lock button 70 and the locking pins 72 to a right.
When a user pushes the shaft lock button 70 to the left against a biasing force of the coil spring while the motor 12 is not driven, the locking pins 72 enters the locking holes 60K of the bevel gear 60 through a slight rotation of the spindle 30 and the bevel gear 60 as appropriate.
Accordingly, the rotation of the bevel gear 60 and members connected to the bevel gear 60 is locked by depressing the shaft lock button 70 by the user.
The tip tool mounting portion 31 has a columnar shape extending leftward and rightward.
The tip tool mounting portion 31 includes a shaft body 100, a sleeve 102, a coil spring 104 as a compression spring, which is an elastic body that has elasticity in an axial direction, a holding member 106, a torsion spring 108 as an elastic body that has elasticity in the rotation direction around an axis, a ring 110, a cap 112, and a screw 114.
The shaft body 100 and the sleeve 102 constitute a shaft portion 115. The shaft portion 115 may have another component.
The polishing wheel 32 has a polishing surface P and a center hole 32H.
The polishing wheel 32 has a columnar shape that include the center hole 32H along a center axis.
The polishing surface P is arranged on an outer curved surface, that is, a cylindrical surface of the polishing wheel 32. The polishing surface P of the rotating polishing wheel 32 is brought into contact with a machined portion of a workpiece W, thereby polishing the machined portion.
The center hole 32H has a “+” shape or “X” shape when viewed from the left side to the right. A center portion of the center hole 32H has a columnar shape extending leftward and rightward. A plurality of (four) wheel flutes 32D are communicated with the center portion of the center hole 32H. Each wheel flute 32D is recessed in a radial direction and extends leftward and rightward. The four wheel flutes 32D are arranged at regular intervals in the circumferential direction. Two of the four wheel flutes 32D face one another as a pair. The remaining two wheel flutes 32D face one another as the other pair.
The polishing wheel 32 is fitted to the tip tool mounting portion 31 by entry of the tip tool mounting portion 31 into the center hole 32H. The center hole 32H may have a “Φ” shape with only one straight part.
The shaft body 100 has a columnar shape extending leftward and rightward.
The shaft body 100 includes a large diameter portion 100R, a flange portion 100B, an O-ring 116, and a small diameter portion 100L.
The shaft body 100 includes a right portion that forms the large diameter portion 100R. The large diameter portion 100R has an outer diameter larger than an outer diameter of the left side. The large diameter portion 100R includes a right outer surface portion at which the flange portion 100B further projecting outward in the radial direction is formed. The O-ring 116 is disposed on an outer curved surface of the flange portion 100B.
A right hole extending leftward from a right end portion is opened inside the large diameter portion 100R. The left portion as the distal end portion in the spindle 30 lies in the right hole. The shaft body 100 is fixed integrally with the spindle 30. The rotation of the spindle 30 is transmitted to the shaft body 100. The shaft body 100 rotates around its own center axis.
The shaft body 100 includes a left portion that forms the small diameter portion 100L. The small diameter portion 100L has an outer diameter smaller than an outer diameter of the right side. A left hole extending rightward from a left end portion is opened inside the small diameter portion 100L.
The sleeve 102 has a cylindrical shape extending leftward and rightward.
The sleeve 102 includes a plurality of (two) ridges 120, a right large diameter hole portion 124, a diameter-expanded hole portion 126, a small diameter hole portion 128, and a left large diameter hole portion 129.
Each ridge 120 is formed on an outer surface of the sleeve 102. Each ridge 120 projects outward in the radial direction and extends leftward and rightward. Each ridge 120 can enter the wheel flute 32D in the center hole 32H of the polishing wheel 32. Each ridge 120 includes a left end portion at which a protruding portion 122 is formed. Each protruding portion 122 projects leftward with respect to an adjacent part. Each protruding portion 122 has a width, that is, a size in an up-down direction or circumferential direction smaller than a width of the ridge 120 at the right side of the protruding portion 122. The width of each protruding portion 122 may be the same as the width of the ridge 120 at the right side of the protruding portion 122 or may be larger than the width of the ridge 120 at the right side of the protruding portion 122.
A right portion of the sleeve 102 includes an inner hole portion that forms the right large diameter hole portion 124 and the diameter-expanded hole portion 126. The right large diameter hole portion 124 is arranged at the left side of the diameter-expanded hole portion 126. The right large diameter hole portion 124 is wider than the left side. The right large diameter hole portion 124 has an inner diameter larger than an inner diameter of the left side. The diameter-expanded hole portion 126 is further wider than the right large diameter hole portion 124. The diameter-expanded hole portion 126 has an inner diameter larger than the inner diameter of the right large diameter hole portion 124.
The flange portion 100B of the shaft body 100 lies in the diameter-expanded hole portion 126. The diameter-expanded hole portion 126 has an inner surface in contact with the O-ring 116. The O-ring 116 is also in contact with an outer surface of the shaft body 100. Accordingly, the intrusion of dust to the left with respect to the O-ring 116 is suppressed. The O-ring 116 allows the sleeve 102 to move in the longitudinal direction with respect to the shaft body 100.
The diameter-expanded hole portion 126 has an outer surface projecting outward in the radial direction with respect to a part at the left side excluding the ridges 120. The outer surface of the diameter-expanded hole portion 126 has almost the same ridge amount as those of the ridges 120. A step portion 130 is formed between the outer surface of the diameter-expanded hole portion 126 and the outer surface of the part at the left side excluding the ridges 120. The step portion 130 has a ring shape when viewed from the left side to the right. The step portion 130 expands forward, rearward, upward, and downward.
The large diameter portion 100R of the shaft body 100 lies in the right large diameter hole portion 124. The coil spring 104 is interposed between a left face of the large diameter portion 100R and a left face of the right large diameter hole portion 124. The coil spring 104 biases the sleeve 102 to the left with respect to the shaft body 100.
A left portion of the sleeve 102 includes an inner hole portion that forms the small diameter hole portion 128 and the left large diameter hole portion 129. The small diameter hole portion 128 is arranged at the right side of the left large diameter hole portion 129. The small diameter hole portion 128 is narrower than the right side. The small diameter hole portion 128 has an inner diameter smaller than an inner diameter of the right side. The left large diameter hole portion 129 is wider than the small diameter hole portion 128. The left large diameter hole portion 129 has an inner diameter larger than the inner diameter of the small diameter hole portion 128. The inner diameter of the left large diameter hole portion 129 is the same or approximately the same as the inner diameter of the right large diameter hole portion 124.
The holding member 106 has a cylindrical shape extending leftward and rightward.
The holding member 106 includes a large diameter portion 140, a plurality of (two) protrusions 142, and a plurality of (two) flutes 144.
The large diameter portion 140 is formed at a center portion in the right-left direction. The large diameter portion 140 bulges outward in the radial direction with respect to an adjacent part. The large diameter portion 140 has an outer diameter larger than an outer diameter of the adjacent part. The outer diameter of the large diameter portion 140 is almost the same as an outer diameter of the sleeve 102 excluding each ridge 120. A part at the right side with respect to the large diameter portion 140 has almost the same outer diameter as the right large diameter hole portion 124 of the sleeve 102.
The part at the right side with respect to the large diameter portion 140 includes a right portion that lies in the right large diameter hole portion 124.
The respective protrusions 142 project outward in the radial direction from a left portion of the large diameter portion 140. The respective protrusions 142 are arranged at regular intervals in the circumferential direction and face one another across a center axis of the holding member 106.
Each protrusion 142 can enter the wheel flute 32D.
The respective flutes 144 have almost the same shape as one another.
Each flute 144 is recessed to the left from a right end portion of the large diameter portion 140. An outer diameter of the holding member 106 at the respective flutes 144 is almost the same as that of the part at the right side with respect to the large diameter portion 140. Each flute 144 exhibits a “Σ” shape when viewed from the rear side to the front.
Each flute 144 includes a first flute portion 150 and a second flute portion 152.
The first flute portion 150 is recessed in the radial direction and extends leftward and rightward. The first flute portion 150 has a width, that is, a size in the circumferential direction almost the same as the width of each protruding portion 122 in the sleeve 102. Each protruding portion 122 can enter the first flute portion 150. The first flute portion 150 is arranged at the right side of the corresponding protrusion 142.
The second flute portion 152 is recessed in the radial direction and extends leftward and rightward. The second flute portion 152 includes an end surface portion 152E and an inclined surface portion 152G. The end surface portion 152E contains a surface expanding leftward, rightward, upward, and downward. The inclined surface portion 152G is arranged between the end surface portion 152E and the first flute portion 150 in the circumferential direction. The inclined surface portion 152G is disposed at the first flute portion 150 side. The inclined surface portion 152G extends from an adjacent portion of a left end portion of the end surface portion 152E to a right end portion of the first flute portion 150. Specifically, the inclined surface portion 152G ranges from a position recessed further to the left of the end surface portion 152E to a position not recessed further to the left of the first flute portion 150. A surface at the inclined surface portion 152G side in the first flute portion 150 has a length in the right-left direction shorter than a length in the right-left direction of an opposed surface of the first flute portion 150.
The torsion spring 108 is interposed between an inside of the part at the right side with respect to the large diameter portion 140 and the small diameter portion 100L of the shaft body 100.
The torsion spring 108 biases the holding member 106 in the circumferential direction and clockwise when viewed from the left side to the right.
The ring 110 is made of felt and has a ring shape.
The ring 110 is interposed between the inside of the part at the right side with respect to the large diameter portion 140 and the left large diameter hole portion 129 of the sleeve 102. The ring 110 is arranged at the right of the holding member 106.
The ring 110 is in contact with the outer surface of the shaft body 100 and an inner surface of the sleeve 102. Accordingly, the intrusion of dust into the tip tool mounting portion 31 is suppressed. The ring 110 allows the sleeve 102 to move in the longitudinal direction with respect to the shaft body 100. The ring 110 may be an O-ring made of rubber.
The cap 112 has a disk shape and expands forward, rearward, upward, and downward.
The cap 112 is integrally fixed to a left end portion of the shaft body 100 with the screw 114. The screw 114 is inserted into the left hole of the shaft body 100.
The holding member 106 is held between the cap 112 and the sleeve 102 and is rotatable around the center axis in the right-left direction.
The following describes the attachment and detachment of the polishing wheel 32 to and from the tip tool mounting portion 31. The tip tool mounting portion 31 excluding the ring 110 and the O-ring 116 constitutes a mounting structure N of the polishing wheel 32 as a tip tool. The tip tool mounting portion 31 constitutes an attachment T1 with the mounting structure N. The attachment T1 may also be referred to as an assembly.
At least one of the ring 110 and the O-ring 116 may be included in the mounting structure N. A configuration of the mounting structure N or the attachment T1 may be variously changed, for example, by adding a new component. In addition, the attachment and detachment of the polishing wheel 32 may be carried out in a posture of the wheel sander 1 which is in a direction different from an illustrated direction, that is, a direction indicated in the description. For example, the attachment and detachment of the polishing wheel 32 may be carried out in a posture where the tip tool mounting portion 31 is oriented in a vertical direction and the distal end portion of the tip tool mounting portion 31 comes an upper. The following description follows the illustrated direction. Furthermore, unlike the wheel sander 1, the tip tool mounting portion 31 may be incorporated in the main body portion 2 in a state that is difficult to separate. Specifically, the tip tool mounting portion 31 need not be the attachment T1 that is easily attachable and detachable to and from the main body portion 2.
When fitting the polishing wheel 32 that has been detached from the tip tool mounting portion 31, as illustrated in
At this time, the holding member 106 is in the attached and detached state. In addition, the respective protruding portions 122 have entered the corresponding first flute portions 150. Accordingly, the holding member 106 is temporarily fixed in the attached and detached state.
The user then brings the polishing wheel 32 close to the tip tool mounting portion 31 from the left side to the right. The user inserts the tip tool mounting portion 31 into the center hole 32H. At this time, the two ridges 120 of the sleeve 102 and the two protrusions 142 of the holding member 106 enter any one pair of the two pairs of the wheel flutes 32D.
The user inserts the polishing wheel 32 until a left face of the polishing wheel 32 reaches the right side of the respective protrusions 142. At this time, a right face of the polishing wheel 32 comes into contact with the step portion 130 of the sleeve 102.
The user further pushes the polishing wheel 32 to the right, that is, an opposite distal end side of the tip tool mounting portion 31 as illustrated by the arrow D in
Then, when left end portions of the protruding portions 122 reach the right end portions of the first flute portions 150 and the protruding portions 122 come out and disengage from the first flute portions 150, as illustrated by the arrow C in
At this time, as illustrated in the drawings including
When the user stops moving the polishing wheel 32 to the right, as illustrated in the arrow E in
Then, as illustrated in
The polishing wheel 32 is fitted in a state where the corresponding ridges 120 enter one pair of wheel flutes 32D. Accordingly, a relative rotation of the polishing wheel 32 relative to the tip tool mounting portion 31 is suppressed.
When pulling out the fitted polishing wheel 32, the user first confirms that the main switch 26 is off, that is, the motor 12 is stopped.
Next, the user presses the shaft lock button 70. Then, the rotation of the tip tool mounting portion 31 is locked via the bevel gear 60 and the spindle 30.
While pressing the shaft lock button 70, the user rotates the holding member 106 counterclockwise when viewed from the left side to the right against the biasing force of the torsion spring 108. At this time, the user pushes the sleeve 102 to the right via the polishing wheel 32 to cause the protruding portions 122 to come out of the second flute portions 152 as necessary.
The holding member 106 enters the attached and detached state as illustrated in
The user moves the polishing wheel 32 to the left with respect to the tip tool mounting portion 31 and pull the polishing wheel 32 out of the tip tool mounting portion 31.
After the removal of the polishing wheel 32 is completed, the user stops depressing the shaft lock button 70.
The handle portion 4 includes a handle holder 200, a grip 202, and a polishing wheel cover 204.
The handle holder 200 has an arm shape and extends upward and downward. The handle holder 200 is made of metal.
The handle holder 200 includes a fitting portion 210, a base portion 212, and an upper hole portion 214.
The fitting portion 210 is arranged at a lower end portion of the handle holder 200. The fitting portion 210 is a part having a “C” shape when viewed from the left side to the right. The fitting portion 210 includes a rear end portion in which a slit is arranged. Screw-holes 220 are provided in an upper side portion and a lower side portion of the slit of the fitting portion 210, respectively. Each screw-hole 220 extends upward and downward.
The fitting portion 210 is arranged around the bearing box 45. The fitting portion 210 is integrally fixed to the bearing box 45 by inserting one screw (not illustrated) into each screw-hole 220. As the screw enters each screw-hole 220, the fitting portion 210 decreases in inner diameter and is tightened against an outer surface of the bearing box 45. Accordingly, the handle portion 4 is fitted to the main body portion 2.
The base portion 212 is arranged at the front side of the fitting portion 210. The base portion 212 is continuous with the fitting portion 210. The base portion 212 may be a separate body from the fitting portion 210. The base portion 212 may be disposed in the main body portion 2. For example, the base portion 212 may be formed at a front portion of the bearing box 45.
The base portion 212 has a forked shape when viewed from the upper side to the lower. The base portion 212 opens to the front. The base portion 212 includes a rear wall portion 222, a left wall portion 224, and a right wall portion 226.
The rear wall portion 222 has an upper portion front face that is a plane expanding upward, downward, leftward, and rightward. When the tip tool mounting portion 31 is horizontal, the upper portion front face of the rear wall portion 222 is aligned along the vertical direction.
The rear wall portion 222 has a center portion front face that is a cylindrical surface with a center axis in the right-left direction. The center portion of the rear wall portion 222 is continuous with the fitting portion 210.
The rear wall portion 222 includes a lower portion that has a flat plate shape expanding upward, downward, leftward, and rightward. The lower portion of the rear wall portion 222 includes a lower edge that is arranged further ahead of the upper portion of the rear wall portion 222. In other words, the lower portion of the rear wall portion 222 inclines downward toward the front.
The left wall portion 224 has a flat plate shape expanding upward, downward, leftward, and rightward. The left wall portion 224 extends forward from a left edge center portion of the rear wall portion 222.
The left wall portion 224 includes a pin hole 230. The pin hole 230 extends leftward and rightward.
The right wall portion 226 includes a right wall portion base 232 and a stop rib 234.
The right wall portion base 232 has a flat plate shape expanding upward, downward, leftward, and rightward. The right wall portion base 232 extends forward from a right edge center portion of the rear wall portion 222. When the tip tool mounting portion 31 is horizontal, an inner surface, that is, a left face of the right wall portion base 232 is aligned along the vertical direction.
The right wall portion base 232 includes a pin hole 236. The pin hole 236 extends leftward and rightward.
The stop rib 234 has a bent plate shape parallel to the front face of the rear wall portion 222. The stop rib 234 extends leftward from a front edge portion of the right wall portion base 232. The stop rib 234 includes an upper left edge portion 234U that extends in a state of sloping rightward as going downward, that is, sloping downward toward the right when viewed from the rear side to the front. The stop rib 234 includes a lower left edge portion 234D that extends in a state of sloping leftward as going downward, that is, sloping downward toward the left when viewed from the rear side to the front.
A lower portion of the stop rib 234, a lower portion of the right wall portion base 232, and a lower portion of the rear wall portion 222 form a first recessed portion 237. The first recessed portion 237 is recessed to the right.
An upper portion of the stop rib 234, an upper portion of the right wall portion base 232, and an upper portion of the rear wall portion 222 form a second recessed portion 238. The second recessed portion 238 is recessed to the right.
The upper hole portion 214 is arranged at an upper end portion of the handle holder 200.
The upper hole portion 214 includes a plurality of (three) grip mounting holes 239. Each grip mounting hole 239 extends leftward and rightward. The grip mounting holes 239 are aligned up and down. The grip mounting holes 239 are aligned at regular intervals.
The grip 202 is a part configured to be gripped by a user. The grip 202 extends leftward and rightward. The grip 202 is parallel to the tip tool mounting portion 31.
The grip 202 is mounted into any of the grip mounting holes 239 in the upper hole portion 214 of the handle holder 200.
As illustrated in
The polishing wheel cover 204 includes a polishing wheel cover main body 240, a cover supporting portion 242, and a plurality of (two) screws 244.
The polishing wheel cover main body 240 has a curved plate shape. The polishing wheel cover main body 240 has a cylindrical surface shape. The polishing wheel cover main body 240 covers the upper and rear of the polishing wheel 32, that is, a user side of the polishing wheel 32. In addition, the polishing wheel cover main body 240 covers the upper right of the polishing wheel 32, that is, the cover supporting portion 242 side.
The cover supporting portion 242 is arranged at the right side of the polishing wheel cover main body 240. The cover supporting portion 242 has a forked shape opening to the right. The cover supporting portion 242 is in contact with front, left, and right faces of a center portion in the up-down direction of the handle holder 200. The cover supporting portion 242 includes a front wall portion that is integrally fixed to the handle holder 200 by one screw 244 inserted from the front side to the rear. The cover supporting portion 242 includes a rear wall portion that is integrally fixed to the handle holder 200 by the other screw 244 inserted from the rear side to the front. Each screw 244 extends forward and rearward.
The polishing wheel cover 204 is mounted to the handle holder 200. The polishing wheel cover 204 can be dismounted from the handle holder 200 by removing each screw 244.
The guiding portion 6 includes a guiding arm 250, a plurality of (two) rolling bodies 252 as contacting portions, a pin 254, a circlip 256, a coil spring 258 as a guiding portion elastic body, and a spring receiver 259.
The guiding arm 250 has a “L” shape when viewed from the front side to the rear. The guiding arm 250 extends downward and leftward in a posture illustrated in
The part of the guiding arm 250 extending downward inclines downward toward the front in the working posture. The part of the guiding arm 250 extending leftward inclines upward toward the front in the working posture.
The guiding arm 250 and the base portion 212 are adjacent to one another.
As illustrated in
The arm hole portion 260 includes an arm hole 262 and a left face portion 264.
The arm hole 262 extends leftward and rightward. The arm hole 262 includes a hole main body 262M and a hole enlargement portion 262E. The hole main body 262M extends horizontally in the right-left direction in the working posture. The hole enlargement portion 262E is arranged at a left portion of the hole main body 262M. The arm hole 262 includes a left portion that is enlarged with respect to a right portion of the arm hole 262 by the hole enlargement portion 262E. The hole enlargement portion 262E is arranged at the lower side of the hole main body 262M in the working posture. In the working posture, a lower surface of the hole enlargement portion 262E inclines downward toward the left.
The left face portion 264 is sloping downward toward the right in the working posture. Specifically, the left face portion 264 includes an upper portion that projects leftward with respect to a lower portion in the working posture. The lower portion of the left face portion 264 escapes to the right with respect to the upper portion in the working posture. The lower portion of the left face portion 264 is an escaping portion 264E that escapes from the base portion 212 when the guiding arm 250 does not incline as illustrated in
Each rolling body 252 is disposed at a left lower portion of the guiding arm 250. Each rolling body 252 includes an exposed left portion. Each rolling body 252 is configured to roll. The rolling bodies 252 are aligned to the front and rear in the working posture. The front rolling body 252 has a center arranged at an upper side with respect to a center of the rear rolling body 252 in the working posture.
It should be noted that one piece or three or more pieces of rolling bodies 252 may be used. At least one of a roller and a sliding member may be disposed in place of the rolling bodies 252 or together with the rolling bodies 252.
The guiding arm 250 can guide the wheel sander 1 along the workpiece W in the working posture by coming in contact with the workpiece W via the respective rolling bodies 252. The guiding portion 6 guides a traveling direction of machining operation in the wheel sander 1. The respective rolling bodies 252 are rolled by the workpiece W. Each rolling body 252 is a contacting portion that comes in contact with the workpiece W. For example, in a state where each rolling body 252 pertaining to the guiding arm 250 in the working posture is brought in contact with a right face of the workpiece W having a long rectangular parallelepiped shape from the front to rear, a user can move the wheel sander 1 along the longitudinal direction of the workpiece W while causing the polishing surface P of the polishing wheel 32 to act on an upper surface of the workpiece W. The wheel sander 1 includes the plurality of rolling bodies 252, thereby making guidance more stable compared with a case where one rolling body 252 is disposed.
The contacting portion may be a part of the guiding arm 250. In addition, the contacting portion may come in contact with a part other than the workpiece W. For example, the contacting portion may come in contact with a guiding ruler.
The guiding arm 250 enters the first recessed portion 237 to engage in the working posture.
The forward movement of the guiding arm 250 pertaining to the working posture is suppressed by the lower portion of the stop rib 234. The stop rib 234 retains a posture of the guiding arm 250 in the working posture. The stop rib 234 retains the guiding arm 250 pertaining to the working posture. The rearward movement of the guiding arm 250 pertaining to the working posture is suppressed by the lower portion of the rear wall portion 222. The rightward movement of the guiding arm 250 pertaining to the working posture is suppressed by the lower portion of the right wall portion base 232.
In
The pin 254 has a columnar shape and extends leftward and rightward. The pin 254 is held onto the base portion 212. The pin 254 is passed between the left wall portion 224 and the right wall portion 226.
The pin 254 rotatably supports the guiding arm 250 around the arm hole 262. The pin 254 passes through insides of the pin holes 230 and 236 and an inside of the arm hole 262. The pin 254 includes a right end portion that is a head portion bulging out in the radial direction with respect to other parts. The pin 254 is retained by the head portion.
The circlip 256 is integrally fixed to a left end portion outer surface of the pin 254. The circlip 256 is arranged at the left side of the left wall portion 224. The circlip 256 has an outer diameter larger than an outer diameter of the pin hole 230. The pin 254 is retained by the circlip 256.
The coil spring 258 is passed between the left wall portion 224 and a base end portion, that is, a right end portion of the arm hole portion 260. The coil spring 258 extends leftward and rightward. The arm hole portion 260 and the pin 254 are arranged at an inner side in the radial direction of the coil spring 258.
The coil spring 258 has a left end in contact with a right face of the left wall portion 224. The coil spring 258 has a right end in contact with the base end portion of the arm hole portion 260 via the spring receiver 259. The spring receiver 259 has a ring shape. The spring receiver 259 is a washer. The spring receiver 259 may be omitted.
The coil spring 258 biases the arm hole portion 260 of the guiding arm 250 to the right.
The posture of the guiding portion 6 is changeable from the working posture to a housing posture. The guiding portion 6 and the base portion 212 constitute a housing mechanism F for the guiding portion 6 of the wheel sander 1. The handle portion 4 and the guiding portion 6 constitute an attachment T2 with the housing mechanism F. The attachment T2 may also be referred to as an assembly.
In the change of the posture, that is, in housing of the guiding portion 6, a user may, for example, face rearward from the front side of the wheel sander 1 to perform a housing operation. In this case, the front, rear, left, and right when viewed from the user who performs the housing operation are different from the front, rear, left, and right in the illustrated direction, that is, the front, rear, left, and right indicated in the description. The following description follows the illustrated direction. The posture of the guiding portion 6 may be changed in a posture of the wheel sander 1 other than the illustrated posture of the wheel sander 1. Furthermore, unlike the wheel sander 1, the guiding portion 6 and the base portion 212 may be incorporated in the main body portion 2 in a state that is difficult to separate, that is, the guiding portion 6 and the base portion 212 need not be the attachment T2 that is easily attachable and detachable to and from the main body portion 2.
In the housing of the guiding portion 6, a user first pushes a lower portion of the guiding arm 250 in the working posture represented by the solid line of
Next, the user rotates the guiding arm 250 around the pin 254 while keeping the guiding arm 250 inclined by pushing to the left and causes the guiding arm 250 to reach the position illustrated by a two-dot chain line S2 of
Subsequently, the user stops pushing the guiding arm 250 to the left. Then, the guiding arm 250 moves to the right by the biasing force of the coil spring 258 and becomes in a posture oriented in the up-down direction along an upper portion of the right wall portion 226, that is, the housing posture as illustrated by a bold two-dot chain line S3 of
The guiding arm 250 and the rolling bodies 252 in the housing posture are positioned at the upper right of the polishing wheel 32 and are retracted from the polishing wheel 32 and the workpiece W. Accordingly, the user can conduct work with the wheel sander 1 in a state that does not cause the guiding portion 6 to act.
On the other hand, the user can change the posture of the guiding portion 6 from the housing posture to the working posture by a procedure mostly reversed from that described above.
Specifically, the user pushes the upper portion of the guiding arm 250 in the housing posture to the left to put the guiding arm 250 in the posture of the two-dot chain line S2 of
An operation example of the wheel sander 1 is described.
A user fits the charged battery 18 to the battery mounting portion 16.
In addition, the user fits the polishing wheel 32 to the tip tool mounting portion 31. The polishing wheel 32 is fitted just by passing the tip tool mounting portion 31 through the center hole 32H and slightly pushing the polishing wheel 32 in at the end. At this time, the holding member 106 is automatically in the fixed state.
When the user operates the main switch 26, the main switch 26 is switched on. Then, the controller 20 controls and supplies the electric power of the battery 18 to the motor 12 such that the motor shaft 50 rotates at a speed according to the rotation position of the speed adjustment dial 24. This allows the motor 12 to be driven at the speed according to the rotation position of the speed adjustment dial 24. The rotation direction of the motor shaft 50 may be switchable.
The rotation of the motor shaft 50 rotates the fan 14, causing the exhaust to the respective exhaust vents 47 to form a flow of air (wind) inside the main body portion 2.
The wind cools an internal mechanism of the wheel sander 1 including the motor 12.
Furthermore, a rotational force of the motor shaft 50 is transmitted to the spindle 30 and the polishing wheel 32 through deceleration at the bevel gear 60.
The user grips the grip portion G of the main body portion 2 with the right hand and grips the grip 202 of the handle portion 4 with the left hand.
Then, the user brings the polishing surface P of the rotating polishing wheel 32 into contact with a machined portion of the workpiece W. The machined portion of the workpiece W is then polished with the polishing wheel 32.
According to the overall shape of the machined portion, the user can change the way the polishing wheel 32 is in contact with the machined portion, that is, the position, range, and the like where the polishing wheel 32 is in contact with the machined portion as appropriate.
In addition, the user can put the guiding portion 6 in the housing posture or the working posture as necessary to polish the workpiece W. When the guiding portion 6 is put in the working posture, the user causes the guiding portion 6 to act on the workpiece W and causes the guiding portion 6 to guide the movement of the polishing wheel 32. The guiding arm 250 is sloping downward toward the front in the working posture. Accordingly, the distal end portion of the guiding arm 250 and the respective rolling bodies 252 are positioned further forward compared with a case of being aligned along the vertical direction. Therefore, the user more easily views the distal end portion of the guiding arm 250 and the respective rolling bodies 252. Accordingly, the workability of guiding in the wheel sander 1 is improved.
When completing polishing, the user stops the operation of sliding the main switch 26 forward to switch off the motor 12. At this time, the polishing wheel 32 stops. The user dismounts the polishing wheel 32 and the battery 18 as appropriate.
It should be noted that the embodiments of the disclosure are not limited to the above-described embodiments and the modification examples, but further changes, for example, as described below can be made as appropriate.
The rotation position of the holding member 106 may be fixed by entry of holding member ridges disposed in the holding member 106 into sleeve flutes provided at the distal end side of ridges of the sleeve 102.
The holding member 106 may be formed as one being switched between the fixed state and the attached and detached state by the movement in the longitudinal direction of the holding member 106 in place of or together with one being switched between the fixed state and the attached and detached state by the rotation around the center axis of the holding member 106. In this case, for example, the shaft portion 115 may have the protruding portions 122. The holding member 106 may have the first flute portions 150 and the second flute portions 152, is biased to the opposite distal end side with respect to the shaft portion 115, and is biased in the rotation direction in which the holding member 106 shifts from the attached and detached state to the fixed state with respect to the shaft portion 115. The holding member 106 in the attached and detached state may rotate toward the fixed state by moving to the distal end side with respect to the shaft portion 115 to cause the protruding portions 122 to disengage from the first flute portions 150.
The deceleration mechanism from the motor shaft 50 to the polishing wheel 32 in the wheel sander 1 may be replaced by a deceleration mechanism other than the pinion portion 52 or the bevel gear 60.
The wheel sander 1 may be AC-driven for a commercial power supply by having a power supply cord in place of the battery mounting portion 16. At least any of the materials of the various cases and housings may be changed to resin, metal, or complexes thereof. The classification of the housing 10 may be changed from the one described above. Additionally, at least any of various members, the quantity of parts, the existence of installation, materials, arrangements, structures, and formats may be changed as appropriate.
Furthermore, the above-described embodiments and the modification examples may be applied to other machining devices. For example, the above-described embodiments and the modification examples may be applied to a standing, that is, stationary machining device instead of a hand-held machining device. Alternatively, the above-described embodiments and the modification examples may be applied to a machining device equipped with a tip tool other than the polishing wheel 32 and may be applied to a circular saw, a jigsaw, or a router.
| Number | Date | Country | Kind |
|---|---|---|---|
| 202310229319.0 | Mar 2023 | CN | national |
