Patent Grant
11731255
The present invention relates to a driving tool equipped with a striking part that strikes a fastener.
In the related art, a driving tool equipped with a striking part which strikes a fastener is described in Patent Literature 1. The driving tool described in Patent Literature 1 has a housing, a motor, a power transmission part, a compressed air supply part, a striking part, and a pressure accumulator. The compressed air supply part is provided inside the housing. The compressed air supply part has a rotary compressor, a supply pipe and an electromagnetic valve. The rotary compressor is connected to the motor via a one-way clutch. The supply pipe connects the rotary compressor and the pressure accumulator. The electromagnetic valve is provided in the supply pipe. The motor is rotatable in a first direction and a second direction. The pressure accumulator is filled with compressed air.
When the motor turns in the first direction and a turning force of the motor is transferred to the striking part via the power transmission part, the striking part operates toward a top dead center, and the pressure of the pressure accumulator increases. When the striking part reaches the top dead center, the turning force of the motor is not transferred to the striking part, and the striking part operates from the top dead center to a bottom dead center under the pressure of the pressure accumulator. When the pressure of the pressure accumulator decreases, the motor turns in the second direction and the rotary compressor compresses air. The compressed air is supplied to the pressure accumulator via the electromagnetic valve.
[Patent Literature 1]
Japanese Patent Laid-Open No. 2017-64864
The inventor of the present application has recognized that, when a rotary compressor is provided in the housing, the size of the driving tool increases.
An objective of the present invention is to provide a driving tool in which an increase in size can be suppressed.
A driving tool of an embodiment has a pressure accumulator which accumulates a compressible gas, a striking part which operates in a first direction to strike a fastener with a pressure of the compressible gas, and a driving part which operates the striking part in a second direction opposite to the first direction to increase the pressure of the pressure accumulator, in which the driving tool has a pressure chamber which is capable of accommodating the compressible gas to be supplied to the pressure accumulator; a casing which forms the pressure accumulator and the pressure chamber; a movable member which is provided in the casing and capable of being operated to reduce a volume of the pressure chamber; and a switching valve which is capable of opening and closing connection between the pressure chamber and the pressure accumulator.
An increase in size of the driving tool according to one embodiment can be suppressed.
Among several embodiments of the driving tool included in the present invention, typical embodiments will be described with reference to the drawings.
The driving tool 10 shown in
A cylinder 25 is accommodated in the cylinder case 20. A pressure accumulator 26 is formed in the cylinder 25 and the main tank 18. The pressure accumulator 26 is filled with a compressible gas. As the compressible gas, an inert gas may be used in addition to air. Examples of the inert gas include nitrogen gas and a rare gas. In this disclosure, an example in which the pressure accumulator 26 is filled with air will be described.
The striking part 12 is disposed from the inside of the housing 11 to the outside. The striking part 12 has a piston 27 and a driver blade 28 as shown in
The driver blade 28 is made of a metal. The piston 27 and the driver blade 28 are provided as separate members, and the piston 27 and the driver blade 28 are connected to each other. The striking part 12 may be operated in the direction of the center line A1.
As shown in
The ejection part 13 is made of a metal or a synthetic resin. The ejection part 13 supports the driver blade 28 to be movable in the direction of the center line A1. A push lever 32 is attached to the ejection part 13. The push lever 32 is movable within a predetermined range in the direction of the center line A1 with respect to the ejection part 13.
The power supply part 14 is attachable to and detachable from the connecting part 24. The power supply part 14 has a housing case and a plurality of battery cells accommodated in the housing case. The battery cell is a rechargeable and dischargeable secondary battery, and as the battery cell, a known battery cell such as a lithium ion battery, a nickel hydrogen battery, a lithium ion polymer battery or a nickel cadmium battery may be arbitrarily used.
The electric motor 15 is disposed in the motor case 23. The electric motor 15 has a rotor 33 and a stator 34. The electric motor 15 is a brushless motor, and the rotor 33 may rotate forward and backward.
The reduction mechanism 16 is provided in the motor case 23. An input element of the reduction mechanism 16 is connected to the rotor 33, and an output element of the reduction mechanism 16 is connected to a pin wheel shaft 35. The conversion part 17 is disposed in the housing 11.
The conversion part 17 shown in
The pinion pins 37 may engage with and disengage from the protrusions 38. When the pinion pins 37 engage with the protrusions 38 and the pin wheel 36 turns counterclockwise in
The striking part 12 shown in
A turning restricting mechanism 39 is provided. The turning restricting mechanism 39 allows the pin wheel shaft 35 to turn counterclockwise in
A magazine 40 shown in
As shown in
Further, an inverter circuit electrically connected to the power supply part 14 and the electric motor 15 is provided inside the housing 11. The inverter circuit connects and disconnects the stator 34 of the electric motor 15 and the power supply part 14. The inverter circuit is equipped with a plurality of switching elements, and the plurality of switching elements may be turned on and off singly. The control part 42 controls the turning and stopping of the electric motor 15, the turning speed of the electric motor 15, and the turning direction of the electric motor 15 by controlling the inverter circuit.
Further, a push sensor, a trigger sensor 79 and a position detection sensor are provided in the housing 11. The push sensor detects whether the push lever 32 is pressed against a driving target material W1 to output a signal. The trigger sensor 79 is provided inside the handle 21, and the trigger sensor 79 outputs a signal according to whether a manipulation force is applied to the trigger 80.
As shown in
The holder 44 has an annular shape, and the holder 44 is attached to the outer peripheral surface of the cylinder 25. A seal member 46 is provided between the outer peripheral surface of the cylinder 25 and the holder 44. The cap 45 is attached to the outer peripheral surface of the holder 44. A seal member 47 is provided between the inner peripheral surface of the cap 45 and the holder 44. The seal members 46 and 47 have annular shapes, and are made of a synthetic rubber. Both the seal members 46 and 47 hermetically seal the pressure accumulator 26.
As shown in
A one-way valve 54 is provided in the first valve accommodation part 50. The one-way valve 54 has a snap ring 55, a support plate 56, a plunger 57, an urging member 58, and a seal member 59. Further, a second passage 60 is formed between the first valve accommodation part 50 and the passage 51. The snap ring 55 is fixed to the holder 44. The support plate 56 has a hole that penetrates in a thickness direction. The plunger 57 may be operated in the direction of the center line A2. The urging member 58 urges the plunger 57 in the direction of the center line A2. The seal member 59 is attached to the plunger 57. The urging member 58 urges the plunger 57, and the seal member 59 comes into contact with the inner peripheral surface of the holding hole 49. The urging member 58 is, for example, a metal spring. In the one-way valve 54, the seal member 59 comes into contact with the inner peripheral surface of the holding hole 49 to close the second passage 60. When the second passage 60 is closed, connection between the pressure accumulator 26 and the passage 51 is closed. In the one-way valve 54, when the seal member 59 separates from the inner peripheral surface of the holding hole 49, the second passage 60 opens. When the second passage 60 opens, the pressure accumulator 26 and the passage 51 are connected.
When a first urging force, which is the total of the urging force corresponding to the pressure of the pressure accumulator 26 and the urging force applied to the plunger 57 from the urging member 58, and a second urging force applied to the plunger 57 according to the pressure of an auxiliary pressure accumulator 73 are the same, the one-way valve 54 closes the second passage 60. The one-way valve 54 opens the second passage 60 when the second urging force exceeds the first urging force. Therefore, some of the compressed air of the auxiliary pressure accumulator 73 flows into the pressure accumulator 26 via the second passage 60 and the passage 51. When the pressure of the pressure accumulator 26 increases, the one-way valve 54 closes the second passage 60. In this way, the one-way valve 54 allows the compressed air to flow into the pressure accumulator 26 from the passage 51, and prevents the compressed air from returning from the pressure accumulator 26 to the passage 51, that is, flowing out.
An auxiliary valve 61 is provided in the second valve accommodation part 52. The auxiliary valve 61 has a valve core 62, a valve core shaft 63, and a second passage 61A. The valve core shaft 63 has a tubular shape, and the valve core 62 is fixed to the mount 48. The valve core shaft 63 is movable with respect to the valve core 62 in the direction of the center line A2. When the valve core shaft 63 moves and stops in the direction of the center line A2, the second passage 61A is opened and closed. When the second passage 61A opens, the passage 51 and the mounting hole 53 are connected to each other. That is, the compressed air may pass through the second passage 61A. When the second passage 61A is closed, connection between the passage 51 and the mounting hole 53 is closed.
The adapter 64 is inserted into the mounting hole 53 and fixed to the mount 48. The adapter 64 has a pin 65, and the pin 65 is movable with respect to the adapter 64 in the direction of the center line A2. A seal member 81 is attached to an outer peripheral surface of the adapter 64. The seal member 81 has an annular shape, and is made of a synthetic rubber. The seal member 81 hermetically seals between the inner surface of the mounting hole 53 and the adapter 64. A hose of the external device is attached to and detached from the adapter 64. The external device includes a compressor, a cylinder, a tank, and the like.
A passage 66 is provided in the mount 48, and the passage 66 is connected to the passage 51. Further, the sub tank 19 is attached to the mount 48. The sub tank 19 is provided inside the housing 11, and the sub tank 19 is made of a metal as an example. The sub tank 19 has a tubular part 67 and a wall part 68 connected to an end part of the tubular part 67 in a direction of a center line A3. The center line A3 intersects the center line A2.
A mounting hole 69 is provided in the mount 48, and an end part of the tubular part 67 is fixed to the mounting hole 69. A seal member 70 is provided between the tubular part 67 and the mount 48. The seal member 70 is made of a synthetic rubber.
A piston 71 is disposed in the tubular part 67. The piston 71 is movable in the direction of the center line A3. A seal member 72 is provided on an outer peripheral surface of the piston 71. The seal member 72 has an annular shape, and is made of a synthetic rubber. The piston 71 separates the interior of the sub tank 19 into an auxiliary pressure accumulator 73 and a space 74. The auxiliary pressure accumulator 73 is connected to the passage 66.
An urging member 75 is disposed in the space 74. The urging member 75 urges the piston 71 shown in
An exhaust hole 76 that penetrates the tubular part 67 in a radial direction is provided. Further, an air hole 77 that penetrates the wall part 68 in the direction of the center line A3 is provided. The exhaust hole 76 connects the inside of the sub tank 19 and the outside E1 of the sub tank 19. The air hole 77 connects the space 74 and the outside E1 of the sub tank 19.
An example in which an operator fills the pressure accumulator 26 with the compressed air will be described. An operation of filling the pressure accumulator 26 with the compressed air is performed with the striking part 12 stopped at the bottom dead center. Examples of reasons for this are as follows. A first reason is that, since the pressure of the compressed air of the pressure accumulator 26 is lowest in a state in which the striking part 12 is stopped at the bottom dead center, the pressure accumulator 26 is easily filled with the compressed air from the outside of the main tank 18. A second reason is that the striking part 12 may be suppressed from operating in the first direction contrary to the operator's intention while the compressed air is being filled. Further, the operator detaches the head cover 22 from the cylinder case 20.
With the hose of the external device connected to the adapter 64, the pin 65 separates from the valve core shaft 63, and the valve core shaft 63 separates from the plunger 57. The auxiliary valve 61 blocks connection between the passage 51 and the mounting hole 53. The one-way valve 54 closes the second passage 60. The seal member 72 is located between the exhaust hole 76 and the passage 66 in the direction of the center line A3.
The operator inserts the hose of the external device into the cylinder case 20, and connects the hose to the adapter 64. Then, the pin 65 pushes the valve core shaft 63, and the passage 51 and the mounting hole 53 are connected to each other. Further, the valve core shaft 63 pushes the plunger 57, and the one-way valve 54 opens the second passage 60, as shown in
Further, some of the compressed air supplied to the passage 51 flows into the pressure accumulator 26 through the first valve accommodation part 50. Therefore, the pressure of the pressure accumulator 26 increases. Further, the pressure of the pressure accumulator 26 is the same as the pressure of the auxiliary pressure accumulator 73.
When the pressure of the pressure accumulator 26 and the pressure of the auxiliary pressure accumulator 73 reach a target pressure, the operator detaches the hose from the adapter 64. Then, the pin 65 separates from the valve core shaft 63, and the auxiliary valve 61 blocks connection between the passage 51 and the mounting hole 53. Further, the valve core shaft 63 separates from the plunger 57. Then, the one-way valve 54 closes the second passage 60.
When the pressure of the pressure accumulator 26 and the pressure of the auxiliary pressure accumulator 73 exceed a target pressure, the seal member 72 moves between the exhaust hole 76 and the wall part 68 in the direction of the center line A3 as shown in
When some of the compressed air of the auxiliary pressure accumulator 73 is discharged from the exhaust hole 76 to the outside E1, a sound is generated. The operator can recognize that the pressure of the pressure accumulator 26 and the pressure of the auxiliary pressure accumulator 73 exceed the target pressure. When an opening area of the exhaust hole 76 is appropriately set, a leakage sound of air is generated during exhaust. Further, a member such as a whistle may be added to the exhaust hole 76. Furthermore, a penetration hole in a direction intersecting the discharge direction of the exhaust hole 76 may also be provided in the tubular part 67. In this way, during exhaust, a loud sound is produced by the principle of a whistle.
The target pressure is a pressure defined from a value exceeding the power when the striking part 12 strikes the nail 41. The target pressure is defined, for example, depending on a stroke amount when the striking part 12 moves from the bottom dead center to a standby position.
Next, an example in which the operator uses the driving tool 10 will be described. The control part 42 stops the electric motor 15 when it is not possible to detect at least one of application of the manipulation force to the trigger 80 or pressing of the push lever 32 against the driving target material W1. When the electric motor 15 is stopped, the striking part 12 is stopped at the standby position. In the present embodiment, as an example, it is assumed that the striking part 12 is stopped at the standby position at which the piston 27 is between the bottom dead center and the top dead center. The top dead center of the piston 27 is a position farthest from the bumper 30 in the direction of the center line A1. The bottom dead center of the piston 27 is a position in contact with the bumper 30 in the direction of the center line A1.
Further, the pinion pin 37 and the protrusion 38 are engaged with each other, and the urging force received by the striking part 12 from the pressure accumulator 26 is transferred to the pin wheel 36. The turning restricting mechanism 39 stops the pin wheel shaft 35, and the striking part 12 stops at the standby position.
When the control part 42 detects that the manipulation force is applied to the trigger 80 and that the push lever 32 is pressed against the driving target material W1, the electric motor 15 turns forward. The turning force of the electric motor 15 is transferred to the pin wheel 36 via the reduction mechanism 16.
The turning force of the pin wheel 36 is transferred to the striking part 12, and the striking part 12 ascends. When the striking part 12 ascends, the volume of the pressure accumulator 26 is narrowed, and the pressure of the pressure accumulator 26 increases. The pressure of the pressure accumulator 26 exceeds the pressure of the auxiliary pressure accumulator 73. When the piston 27 reaches the top dead center, all the pinion pins 37 are disengaged from all the protrusions 38. Then, the striking part 12 descends under the pressure of the pressure accumulator 26. When the striking part 12 descends, the driver blade 28 strikes the nail 41 in the ejection part 13, and the nail 41 is driven into the driving target material W1. The push lever 32 separates from the driving target material W1 under the reaction force with which the driver blade 28 strikes the nail 41. Further, the piston 27 collides with the bumper 30.
The control part 42 processes the signal from the position detection sensor to detect whether the striking part 12 has reached the standby position. The control part 42 stops the electric motor 15 when the striking part 12 reaches the standby position.
On the other hand, the pressure of the pressure accumulator 26 and the pressure of the auxiliary pressure accumulator 73 are the same at the time point when the pressure accumulator 26 and the auxiliary pressure accumulator 73 are filled with compressed air. There is a likelihood that the compressed air of the pressure accumulator 26 may leak to the outside of the main tank 18 when a certain period elapses from the time point when the pressure accumulator 26 and the auxiliary pressure accumulator 73 are filled with the compressed air. As an example, the compressed air leaks from a place sealed by any of the seal members 29, 46, and 47. Then, the pressure of the pressure accumulator 26 becomes lower than the pressure of the auxiliary pressure accumulator 73.
Such leakage of compressed air is caused by the fact that, since the pressure of the pressure accumulator 26 repeatedly increases and drops each time the striking part 12 performs a hitting operation, a repetitive pressure change occurs in the seal members 29, 46, and 47. In particular, since the seal member 29 slides on the inner peripheral surface of the cylinder 25 in accordance with the operation of the striking part 12, combined with the pressure change in the pressure accumulator 26, the compressed air is more likely to leak.
The one-way valve 54 closes the second passage 60 when the first urging force applied to the plunger 57 is the same as the second urging force applied to the plunger 57. In the one-way valve 54, when the second urging force exceeds the first urging force, the plunger 57 operates under the pressure of the passage 51 to automatically open the second passage 60. Therefore, some of the compressed air of the auxiliary pressure accumulator 73 flows into the pressure accumulator 26 via the second passage 60 and the passage 51. When the pressure of the pressure accumulator 26 increases and becomes equal to or higher than the predetermined pressure, the one-way valve 54 automatically closes the second passage 60.
The predetermined pressure mentioned here is a target pressure for the bottom dead center that should be ensured in a state in which the striking part 12 is at the bottom dead center, and the target pressure for the bottom dead center defines a hitting force to be provided when the striking part 12 is at the top dead center, that is, a required pressure at the top dead center required for the striking part 12 to operate to drive the nail 41 into the driving target material W1 by a required amount. The target pressure of the pressure accumulator 26 in a state in which the striking part 12 is located at the bottom dead center is defined according to the target energy of the hitting energy which is applied to the nail 41 when the striking part 12 operates from the top dead center.
In this way, when the pressure of the pressure accumulator 26 drops below the predetermined pressure, the one-way valve 54 automatically opens the second passage 60 to supply some of the compressed air of the auxiliary pressure accumulator 73 to the pressure accumulator 26. Therefore, it is possible to suppress a decrease in power when the striking part 12 operates in the first direction, that is, a decrease in hitting force of the striking part 12.
When some of the compressed air of the auxiliary pressure accumulator 73 flows into the pressure accumulator 26, the piston 71 moves away from the wall part 68 under the urging force of the urging member 75. When the one-way valve 54 blocks connection between the pressure accumulator 26 and the passage 51, the piston 71 stops. In this way, as some of the compressed air of the auxiliary pressure accumulator 73 flows into the pressure accumulator 26, the piston 71 operates away from the wall part 68, and the volume of the auxiliary pressure accumulator 73 decreases. The urging member 75 urges the piston 71 in a direction in which the volume of the auxiliary pressure accumulator 73 is reduced and dominates the pressure of the auxiliary pressure accumulator 73. Specifically, the pressure is maintained substantially the same as at the time point when the auxiliary pressure accumulator 73 is filled with the compressed air.
Further, the center line A3 is disposed to intersect the center line A1 at 90 degrees. Therefore, since the striking part 12 strikes the nail 41 or the piston 27 collides with the bumper 30, it is possible to reduce and suppress the movement of the piston 71 in the direction of the center line A3 when the housing 11 vibrates in the direction of the center line A2.
In addition to the aforementioned effects, the auxiliary pressure accumulator 73 has less pressure change that causes compressed air leakage and fewer seal members than the pressure accumulator 26. Therefore, the pressure drop in the auxiliary pressure accumulator 73 itself is suppressed to an infinitesimally small amount, and even when the driving tool 10 is used for a long period of time, the function of compensating for the pressure drop of the pressure accumulator 26 can be sufficiently maintained.
Another example of a mechanism for supplying the compressed air to the pressure accumulator 26 will be described with reference to
The auxiliary pressure accumulator 73 is connected to the passage 51. The passage 66 shown in
With the hose attached to the adapter 64, the pin 65 separates from the plunger 57. Next, the operator supplies the compressed air to the passage 51 via the adapter 64 and the auxiliary valve 61. Then, a part of the compressed air supplied to the passage 51 flows into the auxiliary pressure accumulator 73. When the second urging force exceeds the first urging force, the one-way valve 54 opens the second passage 60, and part of the compressed air supplied to the passage 51 flows into the pressure accumulator 26. When the operator detaches the hose from the adapter 64, the auxiliary valve 61 blocks the passage 51 and the mounting hole 53. The one-way valve 54 also closes the second passage 60.
Also in the element shown in
Another example of a mechanism for supplying the compressed air to the pressure accumulator 26 will be described with reference to
When the operator attaches the hose to the adapter 64, the pin 65 pushes the plunger 57, and the one-way valve 54 opens the second passage 60. The auxiliary valve 61 and the adapter 64 shown in
Then, when the pressure of the pressure accumulator 26 decreases, the compressed air of the auxiliary pressure accumulator 73 flows into the pressure accumulator 26, and the pressure of the pressure accumulator 26 can be increased. Other operational effects of the elements shown in
Still another example of the mechanism for supplying the compressed air to the pressure accumulator 26 will be described with reference to
Therefore, in the example of
Still another example of the mechanism for supplying the compressed air to the pressure accumulator 26 will be described with reference to
A mounting hole 96 is provided in the mount 48. The mounting hole 96 is connected to the holding hole 90, and an open end part of the mounting hole 96 is exposed on the surface of the mount 48. The holding hole 90 and the mounting hole 96 are disposed concentrically around the center line A4. A piston 97 is disposed in the mounting hole 96. In the mounting hole 96, a cylinder chamber 98 is formed between the piston 97 and the valve core 93. When the valve core shaft 94 operates in the direction of the center line A4, the passage 95 opens and closes. When the passage 95 opens, the cylinder chamber 98 and the passage 91 are connected to each other. When the passage 95 is closed, the cylinder chamber 98 and the passage 91 are block. The mount 48 has a passage 102, and the passage 102 connects the mounting hole 96 and the outside E1.
The seal member 103 is attached to an outer peripheral surface of the piston 97. The seal member 103 comes into contact with an inner surface of the mounting hole 96 to hermetically seal the cylinder chamber 98. The piston 97 has a push pin 99 and a positioning protrusion 104. The positioning protrusions 104 are provided at two locations in the circumferential direction centering on the center line A4. The shaft 100 is connected to the piston 97. The shaft 100 is disposed over the mounting hole 96 and the outside E1 of the holder 44.
The shaft 100 is operable with the piston 97 along the center line A4 in the third direction B1 and the fourth direction B2. The third direction B1 and the fourth direction B2 are opposite to each other. When the piston 97 operates in the third direction B1, the piston 97 approaches the switching valve 92. When the piston 97 operates in the fourth direction B2, the piston 97 separates from the switching valve 92. A knob 108 is fixed to an end part of the shaft 100 located outside the mounting hole 96. The operator may operate the knob 108.
Any of a structure in which the entire shaft 100 is provided inside the housing 11 or a structure, in which the end part of the shaft 100 to which the piston 97 is not attached is exposed to the outside of the housing 11, may be provided. In the structure in which the end part of the shaft 100 is exposed to the outside of the housing 11, an opening part is provided in the housing 11, and a part of the shaft 100 is configured to be operable inside the opening part.
Further, a cap 101 is attached to the mount 48. The cap 101 has a tubular part 107 and a shaft hole 110, and a male screw 105 is provided on an outer peripheral surface of the tubular part 107. A female screw 109 is provided on an inner peripheral surface of the mounting hole 96. When the operator turns the cap 101, the cap 101 may be attached to and detached from the mount 48. The tubular part 107 has a concave part 106. The concave part 106 are provided at two locations in the circumferential direction centering on the center line A4.
The shaft 100 is disposed inside the shaft hole 110. An inner diameter of the shaft hole 110 is smaller than an outer diameter of the piston 97 and smaller than an outer diameter of the knob 108. When the cap 101 is fixed to the mount 48, the piston 97 and the shaft 100 do not come off the mount 48. In a state in which the cap 101 is fixed to the mount 48, the shaft 100 and the piston 97 are operable inside the shaft hole 110 along the center line A4. The shaft 100 is rotatable around the center line A4 with respect to the cap 101. When the cap 101 is detached from the mount 48, the piston 97 and the shaft 100 may come off the mount 48.
When the operator uses the driving tool 10, the shaft 100 is not operated. The positioning protrusion 104 is located outside the concave part 106. A tip of the positioning protrusion 104 comes into contact with the tubular part 107, and the piston 97 is stopped at the initial position in the direction of the center line A4. When the piston 97 is stopped at the initial position, the seal member 103 blocks the cylinder chamber 98 and the passage 102. That is, the seal member 103 seals the cylinder chamber 98. Also, the push pin 99 separates from the valve core shaft 94. Therefore, the passage 95 of the switching valve 92 is closed. Therefore, the passage 91 and the cylinder chamber 98 are blocked. Accordingly, the compressed air of the pressure accumulator 26 does not leak to the pressure chamber.
When the operator recognizes power insufficiency of the striking part 12, the operator may perform the next work in the state in which the striking part 12 is stopped at the bottom dead center.
The operator grasps the knob 108 with a finger, turns the shaft 100 around the center line A4 by a predetermined angle, locates the positioning protrusion 104 and the concave part 106 at the same position in the circumferential direction centering on the center line A1, and stops the shaft 100.
Furthermore, the shaft 100 and the piston 97 are operated in a direction along the center line A4 and away from the switching valve 92. Then, the positioning protrusion 104 enters the concave part 106. When the piston 97 operates in the direction away from the switching valve 92, the volume of the cylinder chamber 98 is enlarged. Further, as shown in
Further, the operator operates the shaft 100 and the piston 97 in the third direction B1. Then, as shown in
Then, the operator stops the shaft 100 and the piston 97 at the second operating position shown in
In addition, the operator operates the shaft 100 and the piston 97 stopped at the second operation position in a direction along the center line A4 and away from the switching valve 92. Then, the push pin 99 separates from the valve core shaft 94, the valve core shaft 94 is operated by the force of the urging member, and stops, and the passage 95 is closed. Thereafter, the operator repeats the manipulation of causing the piston 97 to reciprocate between the first operating position and the second operating position, and performs the operation of supplying the air compressed in the cylinder chamber 98 to the pressure accumulator 26 via the passage 91. Further, the operator turns the shaft 100 around the center line A4 to set the positioning protrusion 104 and the concave part 106 at different positions around the center line A4, and then stops the shaft 100 and the piston 97 at the initial position as shown in
In this way, in the embodiment shown in
Further, the maximum pressure of the cylinder chamber 98 is determined on the basis of parameters such as the volume of the cylinder chamber 98 and the effective operation amount of the piston 97. Therefore, it is possible to prevent the pressure accumulator 26 from being filled with air beyond the upper limit pressure of the pressure accumulator 26. The effective operation amount of the piston 97 is an amount with which the piston 97 is operable in a direction of approaching the switching valve 92, in the state in which the seal member 103 blocks the cylinder chamber 98 and the passage 102.
Further, in the state in which the passage 95 of the switching valve 92 is closed, even if the compressed air of the pressure accumulator 26 leaks into the cylinder chamber 98 from the contact location between the valve core 93 and the mount 48, when the piston 97 stops at the initial position, the seal member 103 blocks the cylinder chamber 98 and the passage 102. Therefore, the air of the cylinder chamber 98 can be prevented from leaking to the outside E1.
The operator operates the shaft 100 and the piston 97 to fill the pressure accumulator 26 with air, in the state in which the striking part 12 is stopped. The state in which the striking part 12 is stopped may be either a first state in which the striking part 12 is in contact with the bumper 30 and stopped, or a second state in which the striking part 12 separates from the bumper 30 and stopped. When the striking part 12 is stopped in the first state, the maximum pressure of the pressure accumulator 26 that may increase by the operation of the piston 97 is set to be lower than the maximum pressure of the pressure accumulator 26 that may increase by the operation of the piston 97 when the striking part 12 is stopped in the second state.
The examples shown in
When the operator uses the driving tool 10, the shaft 100 is not operated as shown in
An operator grasps the knob 108 with a finger and turns the shaft 100 around the center line A4 by a predetermined angle to set the positioning protrusion 104 and the concave part 106 at the same position in the circumferential direction around the center line A1 and stop the shaft 100. Then, the piston 97 operates in a direction away from the switching valve 92 by the urging force of the urging member 111, the positioning protrusion 104 enters the concave part 106 as shown in
Further, when the operator applies the manipulation force to the knob 108 to bring the piston 97 to approach the switching valve 92 against the force of the urging member 111, the push pin 99 is pressed against the valve core shaft 94 to open the passage 95 as shown in
Further, the operator turns the shaft 100 around the center line A4 to set the positioning protrusion 104 and the concave part 106 at different positions around the center line A4, and then stops the shaft 100 and the piston 97 at the initial position, as shown in
Further, as shown in
In the examples shown in
Further, when the air compressed in the cylinder chamber 98 is supplied to the pressure accumulator 26 in the state in which the striking part 12 is stopped at the bottom dead center, the striking part 12 does not move while the air pressure of the pressure accumulator 26 increases. Therefore, the hitting energy of the striking part 12 after completion of the supply of air to the pressure accumulator 26 is stable.
In the examples shown in
The contents disclosed in the embodiments and the drawings include some subjects described below. These subjects define contents including a partial configuration among the contents disclosed in the embodiment and drawings, as a driving tool, respectively.
(Subjects included in the examples subsequent to
(Subjects included in the examples of
An example of the technical meaning of the matters explained in the embodiment is as follows. The driving tool 10 is an example of a driving tool, and the pressure accumulator 26 is an example of a pressure accumulator. The first direction D1 is an example of a first direction, the second direction D2 is an example of a second direction, and the striking part 12 is an example of a striking part. The electric motor 15 and the conversion part 17 are an example of a driving part. The auxiliary pressure accumulator 73 is an example of the auxiliary pressure accumulator. The first valve accommodation part 50, the passage 51, and the passage 66 are an example of the first passage. The one-way valve 54 is an example of a one-way valve. The auxiliary valve 61 is an example of the auxiliary valve. The sub tank 19 is an example of an auxiliary container. The piston 71 is an example of a wall part. The urging member 75 is an example of an urging member. The second passage 61A is an example of the second passage. The exhaust hole 76 is an example of a third passage. The valve core shaft 63 is an example of a movable piece. The plunger 57 is an example of a second valve body and a third valve body. The direction of the center line A2 or the direction of the center line A3 is an example of an operating direction of a movable piece, and is also an example of an operating direction of the second valve body and the third valve body.
The space 74 is an example of an accommodation chamber. The air hole 77 is an example of an opening part. The piston 71, the seal member 72, and the exhaust hole 76 are an example of a leak valve. The target pressure is an example of a predetermined pressure. The exhaust hole 76 is an example of a passage. The housing 11 is an example of a housing. The head cover 22 is an example of a lid part. The control part 42 and the position detection sensor are an example of a detection part. The position of the striking part 12 at which the piston 27 comes into contact with the bumper 30 in the direction of the center line A1 is an example of a bottom dead center of the striking part. The nail 41 is an example of a fastener.
Each of the cylinder chamber 98 and the auxiliary pressure accumulator 73 is an example of a pressure chamber. The main tank 18 is an example of a casing. The pistons 71 and 97 are examples of movable members. Each of the switching valve 92 and the one-way valve 54 is an example of a switching valve. The third direction B1 is an example of a third direction, and the fourth direction B2 is an example of a fourth direction. The outside E1 is an example of an outside of the casing. The passage 102 is an example of an auxiliary passage.
A state in which the piston 97 operates in the third direction B1 and the switching valve 92 connects the pressure accumulator 26 and the cylinder chamber 98 is an example of a first operating state. A state in which the piston 97 operates in the fourth direction B2 and the switching valve 92 blocks the pressure accumulator 26 and the cylinder chamber 98 is an example of a second operating state. The valve core shaft 94 is an example of a first valve body.
The driving tool is not limited to the above-mentioned embodiment, and various modifications can be made without departing from the spirit of the invention. For example, in
The electric motor may be a brushed motor or a brushless motor. The power supply part of the electric motor may be either a DC power supply or an AC power supply. The power supply part includes one that is detachable from the housing and one that is connected to the housing via a power cable. The power supply part may be a primary battery instead of the secondary battery.
The driving part that operates the striking part in the second direction includes a motor, a speed reduction mechanism, and a conversion part. The motor includes a hydraulic motor, a pneumatic motor, and an engine, in addition to the electric motor.
The conversion part includes a rack and pinion mechanism, a traction mechanism, and a cam mechanism. The traction mechanism transmits the turning force of the motor to the striking part via the cable, and pulls the striking part to move the striking part in the second direction. The cam mechanism is a mechanism in which an annular cam surface having a gently changed outer diameter is formed in a turning element turned by the turning force of the motor.
The turning element that transmits the turning force of the motor to the conversion part includes a gear, a pulley, a roller, a carrier of a planetary gear mechanism, and a disc member.
The pressure accumulator is a space that accommodates a compressible gas, and is formed in a container such as a tank or a casing. The first passage, the second passage, and the third passage are passages through which the compressible gas flows, and include a hole, an openings part, a gap, a space, a port, and the like. The compressible gas may pass through the auxiliary valve, when the striking part is at the bottom dead center in the operation direction.
In the examples shown in
The center line A4 shown in
| Number | Date | Country | Kind |
|---|---|---|---|
| 2018-083278 | Apr 2018 | JP | national |
| 2018-224670 | Nov 2018 | JP | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/JP2019/014014 | 3/29/2019 | WO |
| Publishing Document | Publishing Date | Country | Kind |
|---|---|---|---|
| WO2019/208102 | 10/31/2019 | WO | A |
| Number | Name | Date | Kind |
|---|---|---|---|
| 20150053736 | Pomeroy | Feb 2015 | A1 |
| 20150174748 | Furuta | Jun 2015 | A1 |
| Number | Date | Country |
|---|---|---|
| 2015116616 | Jun 2015 | JP |
| 2017064864 | Apr 2017 | JP |
| 2011010512 | Jan 2011 | WO |
| 2015037299 | Mar 2015 | WO |
| 2016136632 | Sep 2016 | WO |
| Entry |
|---|
| “International Search Report (Form PCT/ISA/210) of PCT/JP2019/014014,” dated Jun. 25, 2019, with English translation thereof, pp. 1-2. |
| Number | Date | Country | |
|---|---|---|---|
| 20210245345 A1 | Aug 2021 | US |
