driving tool

Abstract

The present invention provides a driving tool. There has long been a need for a lifter that can supply high-viscosity lubricating oil to the surface of the engaging pin of the lifter to suppress the wear of the engaging pin. The driving tool has a driver that impacts the driving part and an elastic body that applies force to the driver downward. The driving tool has a lifter that can rotate through an electric motor as a power source and overcome the force of the elastic body to move the driver to the top dead center. The driver has a plurality of meshing teeth arranged in a straight line. The lifter has a plurality of engaging pins arranged along the circumferential direction in a manner that can engage with the plurality of meshing teeth and a wheel portion having a plurality of pin support holes along the circumferential direction at each end for holding the plurality of engaging pins. The lifter has a grease groove and a grease storage portion, wherein the grease groove is adjacent to the pin support hole that supports the final pin and passes through the wheel portion along the extension direction of the pin support hole; the grease storage portion is recessed in a manner adjacent to the grease groove.

Description

Technical Field

[0001] The present invention relates to a driving tool for driving driving members such as nails and U-shaped staples into wood or the like. Background Art

[0002] A driving tool is known that uses an elastic body such as a gas spring or a mechanical spring to drive a driver to impact a driven part. The gas spring-type driving tool disclosed in Patent Document 1 comprises: a driver that impacts the driven part; a driving mechanism that drives the driver downward; and a lifter that moves the driver upward. The driving mechanism comprises a piston and a cylinder that form a pressure storage chamber. The elastic body (gas) sealed in the pressure storage chamber stores the driving energy for driving the driver. The driver is provided integrally with the piston. The lifter has a locking pin that can engage with the meshing teeth of a rack provided on the driver.

[0003] During the initial stages of the driving operation, the lifter holds the driver in a standby position near top dead center. When the user activates the driving tool's on / off switch by pulling the on / off handle, the driver is moved from the standby position to top dead center by the lifter. As the piston and driver move upward via the lifter, the air pressure in the pressure accumulator increases. The pressure of the gas stored in the pressure accumulator causes the piston and driver to move downward, and the driver impacts the driven part.

[0004] When the driver is driven downward from the top dead center, the engaging pin engaging the meshing teeth of the rack is subjected to extremely high surface pressure. This causes the engaging pin to wear easily. Patent Document 1 discloses a structure in which a lubricating oil impregnated body impregnated with lubricating oil contacts the engaging pin, thereby supplying lubricating oil to the engaging pin.

[0005] Conventional lubrication systems using lubricating oil impregnation require separate impregnation materials. Furthermore, space is required to assemble the lubricating oil impregnation element within the lifter. Furthermore, the viscosity of the lubricating oil must be reduced to ensure proper impregnation. Consequently, lubricating oil is less likely to remain on the surface of the engaging pin.

[0006] [Prior art literature]

[0007] [Patent Document]

[0008] Patent Document 1: International Publication No. 2018 / 180082 Summary of the Invention

[0009] [Technical problem to be solved by the invention]

[0010] A structure capable of suppressing wear on the engaging pins of a lifter, which are subjected to high surface pressure, is desired. This structure allows high-viscosity lubricating oil to remain easily on the surface of the engaging pins, thereby suppressing wear on the engaging pins. Therefore, there has long been a need for a lifter capable of supplying high-viscosity lubricating oil to the surface of the engaging pins to suppress wear on the engaging pins.

[0011] [Technical solutions for solving technical problems]

[0012] According to one technical solution of the present invention, the driving tool has a driver and an elastic body, wherein the driver is arranged in a manner that can move up and down and impacts the driving member by moving downward; the elastic body applies force downward to the driver. The driving tool has an electric motor as a power source and a lifter, wherein the lifter can be rotated by the electric motor and overcome the force of the elastic body to move the driver to the top dead center. The driver has a plurality of meshing teeth arranged in a straight line. The lifter has a plurality of engaging pins and a wheel portion, wherein the plurality of engaging pins are arranged along the circumferential direction in a manner that can engage with the plurality of meshing teeth; the wheel portion has a plurality of pin support holes along the circumferential direction for holding each end of the plurality of engaging pins. The lifter has a grease groove and a grease storage portion, wherein the grease groove is adjacent to at least one of the plurality of pin support holes and passes through the wheel portion along the extension direction of the pin support holes; the grease storage portion is recessed adjacent to the grease groove.

[0013] Therefore, lubricating oil (grease) can be supplied from the grease reservoir through the grease groove adjacent to the pin support hole to the surface of the engaging pin supported by the pin support hole. Therefore, the grease groove can supply highly viscous lubricating oil to the surface of the engaging pin, thereby reducing wear on the engaging pin.

[0014] According to another technical solution of the present invention, a grease groove is located on the side where the engaging pin contacts the meshing teeth when the actuator is moved upward. Therefore, the engaging pin experiences greater surface pressure at the contact point with the meshing teeth. This allows lubricating oil to be supplied to the area of the engaging pin surface that experiences greater surface pressure. This allows for reduced wear of the engaging pin with a relatively small amount of lubricating oil.

[0015] According to another aspect of the present invention, the driving tool includes a cover mounted on the wheel portion and covering one end of the plurality of pin support holes. A grease reservoir is provided in the cover. This allows lubricant to be supplied to the surface of the engaging pins without significantly changing the shape of the lifter.

[0016] According to another technical solution of the present invention, the cover has an engaging protrusion that projects toward the wheel. The wheel has an engaging recess that engages with the engaging protrusion and restricts the cover's rotation relative to the wheel. Consequently, the positional relationship between the grease reservoir provided on the cover and the engaging pin and grease groove provided on the wheel is fixed. Consequently, lubricating oil can be consistently supplied from the grease reservoir through the grease groove to the surface of the engaging pin.

[0017] According to another technical solution of the present invention, the center of the grease reservoir is eccentric relative to the central axis of the engaging pin. This prevents the engaging pin from axially deflecting and entering the grease reservoir. Consequently, the engaging pin can support the meshing teeth while withstanding significant surface pressure.

[0018] According to another aspect of the present invention, the center of the grease reservoir is positioned on an extension of the grease groove. Consequently, the grease groove is adjacent to the center of the grease reservoir, which holds more lubricating oil than the edges of the grease reservoir. This prevents interruptions in the lubricating oil supply to the surface of the engaging pin.

[0019] According to another technical solution of the present invention, the elastic body is a fluid. Therefore, the fluid stores a predetermined amount of driving energy even when not in progress. Consequently, the engaging pin is continuously subjected to high surface pressure from the meshing teeth. By constantly supplying lubricating oil from the grease reservoir to the surface of the engaging pin, wear of the engaging pin, which is constantly subjected to high surface pressure, can be suppressed.

[0020] According to another technical solution of the present invention, the multiple engaging pins include a final pin, which engages with any one of the multiple meshing teeth in a manner that enables the actuator to move to top dead center. The grease reservoir and grease groove are positioned adjacent to the pin support hole that holds the final pin. This allows lubricating oil to be supplied particularly to the surface of the final pin, which is subject to greater surface pressure. This reduces wear on the final pin.

[0021] According to another embodiment of the present invention, the grease reservoir is hemispherical. Therefore, lubricating oil is less likely to remain at the edge of the grease reservoir. Consequently, lubricating oil can be supplied from the grease reservoir to the grease groove without interruption. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a side view of the driving tool according to the first embodiment.

[0023] Figure 2 yes Figure 1 Sectional view II-II.

[0024] Figure 3 yes Figure 1 Sectional view III-III in the middle shows the machine in standby mode.

[0025] Figure 4 yes Figure 1 Sectional view III-III in the figure shows the state where the actuator moves to the top dead center.

[0026] Figure 5 yes Figure 1 Sectional view III-III in the middle shows the state after the impact.

[0027] Figure 6 yes Figure 1 Section III-III in the figure shows the state when the actuator starts to move upward.

[0028] Figure 7 It is a three-dimensional diagram of the lifter.

[0029] Figure 8 This is a three-dimensional exploded view of the lifter.

[0030] Figure 9 This is a perspective view of the lifter cover viewed from the inner surface side.

[0031] Figure 10 This is a plan view of the lifter cover as viewed from the inner surface side.

[0032] Figure 11 yes Figure 10 Sectional view XI-XI.

[0033] Figure 12 It is a top view of the lifter.

[0034] Figure 13 yes Figure 12 Section view XIII-XIII.

[0035] Figure 14 yes Figure 12 Section XIV-XIV.

[0036] Figure 15 This is a cross-sectional view of the lifter according to the second embodiment, and is equivalent to Figure 12 Figure of the XIII-XIII sectional view.

[0037] Figure 16 This is a cross-sectional view of the lifter according to the second embodiment, and is equivalent to Figure 12 Figure of the XIV-XIV section view.

[0038] [Explanation of Reference Numerals]

[0039] 1: Driving tool (first embodiment); 2: Main body housing; 3: Driving mechanism; 4: Cylinder; 4a: Pressure storage chamber; 4b: Shock absorber; 5: Piston; 6: Driver; 6a: Rack; 6b: Meshing teeth; 7: Driving protrusion; 7a: Ejection port; 7b: Driving passage; 7c: Contact arm; 7d: Compression spring; 8: Nail magazine; 9: Driver guide; 9a: Opening; 10: Tool body; 11: Handle; 12: Switch operating handle; 12a: Start switch; 13: Battery installation; 14: Battery pack; 15: Controller; 20: Return mechanism; 21: Electric motor; 21a: Motor housing; 21b: Motor shaft; 22: Reduction gear set; 22a: Gear housing; 23: Lift 1: lowering device; 23a: lifter housing; 24: engaging pin; 24a: final pin; 24b: center axis; 25: wheel; 25a: pin supporting hole; 25b: grease groove; 25c: engaging recess; 25d: pin supporting hole; 26: cover; 26a: grease reservoir; 26b: engaging protrusion; 27, 28: bearings; 29: clutch mechanism; 30: driving tool (second embodiment); 31: lifter; 32: engaging pin; 32a: final pin; 32b: center axis; 33: wheel; 33a: pin supporting hole; 33b: grease groove; 34: first cover; 34a: grease reservoir; 35: second cover; 35a: grease reservoir; n: driven part; W: driven material. DETAILED DESCRIPTION

[0040] according to Figures 1 to 14 The driving tool 1 according to the first embodiment of the present invention is described below. In this embodiment, a gas spring type driving tool is exemplified as the driving tool 1, which uses the gas pressure of the gas (elastomer, fluid) sealed in the pressure storage chamber 4a as the thrust for driving the driving part n. Figure 1 As shown, the driving tool 1 comprises a tool body 10 and a handle 11. The tool body 10 comprises a substantially cylindrical main body housing 2; the handle 11 extends from the side of the tool body 10. A driving protrusion 7 is provided at the top end of the tool body 10. The driving protrusion 7 contacts the driven material W to eject the driven part n (see FIG. Figure 4 ). In the following description, the vertical direction is defined as the driving direction being downward.

[0041] like Figure 3As shown, the tool body 10 has a driving mechanism 3 for driving the driving part n downward. The driving mechanism 3 has a cylinder 4 and a piston 5, wherein the cylinder 4 is internally mounted in the main body housing 2; the piston 5 is supported by the cylinder 4 in a manner that allows it to reciprocate in the up and down directions. The pressure storage chamber 4a is formed by being surrounded by the upper surfaces of the cylinder 4 and the piston 5. A driver 6 for impacting the driving part n is provided at the center of the lower surface of the piston 5. The driver 6 extends downwardly for a long distance. The lower part of the driver 6 enters the driving passage 7b of the driving protrusion 7. The driving passage 7b is formed inside the cylindrical driver guide 9. An ejection port 7a for driving the driving part n is opened at the lower end of the driving protrusion 7.

[0042] like Figure 3 As shown, a nail magazine 8 loaded with a plurality of driving pieces n is coupled to the side of a driver guide 9. The driving pieces n are supplied from the nail magazine 8 to the driving passage 7b. The driving pieces n supplied to the driving passage 7b are impacted by the driver 6 moved downward by the driving mechanism 3 and driven into the material W to be driven.

[0043] like Figure 1 、 3 As shown, a contact arm 7c capable of sliding in the up and down directions is provided at the top end of the driving protrusion 7. The contact arm 7c is urged downward by a compression spring 7d. The contact arm 7c overcomes the spring force and moves upward by coming into contact with the material W to be driven. A switch operating handle 12 that is operated by pressing the fingertips of the holding hand is provided at the base of the handle portion 11. A starting switch 12a is housed in the upper portion of the switch operating handle 12. By pressing the switch operating handle 12, the starting switch 12a is switched from the off state to the on state. When the contact arm 7c comes into contact with the material W to be driven and moves upward and when the starting switch 12a is in the on state, the driving action of the driver 6 is performed.

[0044] like Figure 1 As shown, a battery mounting portion 13 is provided at the top of the handle portion 11, into which a battery pack 14 serving as a power source can be mounted. The battery mounting portion 13 is rectangular and box-shaped and extends vertically. The battery pack 14 can be removed from the battery mounting portion 13 and repeatedly charged using a separate charger. The battery pack 14 can be used as a power source for other power tools. A controller 15 is housed within the battery mounting portion 13 and is contained within a rectangular, plate-shaped housing.

[0045] like Figure 3As shown, the driving tool 1 includes a return mechanism 20 for integrally returning the piston 5 and driver 6 upward. The return mechanism 20 moves the driver 6 upward, causing the piston 5 to return upward. This increases the air pressure in the pressure accumulator chamber 4a on the upper surface of the piston 5, storing driving energy (thrust generated by the air pressure in the pressure accumulator chamber 4a). A shock absorber 4b is provided at the bottom of the cylinder 4 to absorb the impact of the piston 5 reaching its bottom dead center.

[0046] like Figure 1 、 2 As shown, the return mechanism 20 has an electric motor 21, a reduction gear set 22 and a lifter 23. The electric motor 21, the reduction gear set 22 and the lifter are respectively housed in a cylindrical motor housing 21a, a gear housing 22a and a lifter housing 23a. Starting from the side close to the protrusion 7, they are arranged in the order of the lifter housing 23a, the gear housing 22a and the motor housing 21a. The lifter housing 23a, the gear housing 22a and the motor housing 21a are connected to each other. The motor housing 21a is connected to the battery mounting portion 13. Therefore, the main body housing 2, the handle portion 11, the battery mounting portion 13, the motor housing 21a, the gear housing 22a and the lifter housing 23a form a circular ring shape.

[0047] like Figure 2 As shown, the electric motor 21 has a motor shaft 21b extending in the vertical direction in the drawing. The electric motor 21 is started by using the power of the battery pack 14 as a power source. Figure 5 ) and the pull operation of the switch operating handle 12 to start the electric motor 21. The rotation output of the electric motor 21 is decelerated by the reduction gear group 22 and output to the lifter 23.

[0048] like Figure 2 、 3 As shown, the lifter 23 has a wheel portion 25 of a substantially cylindrical shape and a plurality of engaging pins 24 supported by the wheel portion 25. The wheel portion 25 is supported by a bearing 27 on the reduction gear group 22 side and a bearing 28 on the protruding portion 7 side so as to be rotatable around the substantially cylindrical axis. The wheel portion 25 meshes with the reduction gear group 22 and receives the rotation output from the reduction gear group 22. Figure 7 The gear housing 22a houses a clutch mechanism 29 that restricts the rotation direction of the lifter 23 to one direction.

[0049] like Figure 3 、 8 As shown, a plurality of engagement pins 24 are arranged at equal intervals along the outer circumference of the wheel portion 25 with the rotation axis of the wheel portion 25 as the center. The engagement pins 24 are cylindrical and extend in the extending direction of the rotation axis of the wheel portion 25. Figure 13As shown, both ends of the engagement pin 24 are supported by pin support holes 25a and 25d provided in the wheel portion 25. The engagement pin 24 can rotate around its central axis. Figure 2 The pin support hole 25a on the side is a through hole that passes through the wheel portion 25. The reduction gear group 22 (refer to Figure 2 ) side of the pin support hole 25d is a recessed portion that does not penetrate the wheel portion 25.

[0050] like Figure 8 As shown, the lifter 23 has a cover 26 mounted on the wheel portion 25 and covering one end of the pin support hole 25a. The cover 26 has a pair of engaging protrusions 26b protruding toward the wheel portion 25 on the inner surface side facing the wheel portion 25 (see FIG. Figure 9 、 10 ). The engaging protrusion 26b is in an arc shape when viewed from above. The wheel portion 25 has a pair of engaging recesses 25c that are recessed so as to be able to engage with the pair of engaging protrusions 26b. By engaging the engaging protrusion 26b with the engaging recesses 25c, the cover 26 is mounted on the wheel portion 25 in a non-rotatable manner (see Figure 12 By attaching the cover 26 to the wheel portion 25 , the engaging pin 24 can be prevented from being detached from the wheel portion 25 .

[0051] like Figure 3 As shown, the plurality of engagement pins 24 are not arranged along the entire periphery of the wheel portion 25, but are arranged in a partially unarranged area on the outer periphery of the wheel portion 25. Figure 3 The final pin 24a is located at the end in the clockwise direction. The final pin 24a is an engagement pin 24 that moves the driver 6 upward from the standby position to the top dead center. The diameter of the final pin 24a is larger than that of the other engagement pins 24.

[0052] like Figure 8 、 14 As shown, a grease groove 25b is provided adjacent to the pin support hole 25a supporting the final pin 24a. The grease groove 25b extends along the through direction of the pin support hole 25a and penetrates the wheel portion 25. The grease groove 25b is provided between the final pin 24a and the lowermost meshing tooth 6b (see Figure 3 ) on the side of the meshing. Grease groove 25b is Figure 14 The middle is provided on the right side of the final pin 24a.

[0053] like Figure 9 、 11As shown, the cover 26 has a hemispherical recessed grease reservoir 26a on its inner surface facing the wheel portion 25. Grease reservoir 26a contains high-viscosity lubricating oil for supplying to the surface of the final pin 24a. When the cover 26 is attached to the wheel portion 25, the grease reservoir 26a is adjacent to the grease groove 25b and the end of the final pin 24a. The grease reservoir 26a is designed to be sized so as not to exceed the diameter of the final pin 24a. The center of the grease reservoir 26a is eccentric with respect to the central axis 24b of the final pin 24a. The grease reservoir 26a is not located on an extension of the central axis 24b. The center of the grease reservoir 26a is located on an extension of the grease groove 25b.

[0054] like Figure 3 As shown, the driver 6 has a rack 6a, and the rack 6a has a plurality of meshing teeth 6b. The meshing teeth 6b are arranged at equal intervals along the length direction (up and down direction) of the rack 6a. The driver guide portion 9 has an opening portion 9a formed as an arc-shaped notch on the side of the driving passage 7b. The engaging pin 24 retained by the wheel portion 25 can enter the driving passage 7b through the opening portion 9a. The meshing teeth 6b mesh with any one of the engaging pins 24 entering the driving passage 7b. The lowest meshing tooth 6b meshes with the final pin 24a. The wheel portion 25 is at Figure 3 The actuator 6 rotates counterclockwise, and the meshing teeth 6b mesh with the engagement pin 24. As a result, the actuator 6 moves upward.

[0055] Next, a series of processes of the driving operation of the driving tool 1 will be described. Figure 3 In the driving standby state shown in FIG, the driver 6 is held in the standby position. Finally, the pin 24a engages with the meshing tooth 6b at the bottom of the rack 6a. At this time, the start switch 12a (see FIG. Figure 1 ) is disconnected.

[0056] like Figure 1 As shown, starting from the driving standby state, the contact arm 7c is brought into contact with the driven material W and the switch operating handle 12 is pulled. As a result, the start switch 12a is turned on and the electric motor 21 is started. Figure 3 As shown, by starting the electric motor 21, the lifter 23 moves in the winding direction (in Figure 3 The driver 6 is further moved upward from the standby position by the final pin 24a. When the driver 6 moves to the top dead center, the driving piece n is supplied from the nail magazine 8 to the driving passage 7b.

[0057] like Figure 4As shown in FIG. 1 , when the driver 6 and the piston 5 reach the top dead center, the air pressure in the pressure storage chamber 4a is sufficiently increased. The air pressure in the pressure storage chamber 4a acts on the piston 5 downward. The lifter 23 further rotates, finally disengaging the pin 24a from the meshing teeth 6b. Figure 5 As shown, the piston 5 is pushed to the bottom dead center. The driver 6 impacts the driving member n in the driving passage 7b and drives it into the driven material W.

[0058] Start switch 12a (see Figure 1 ) is also kept in the on state when the driver 6 is driving. Therefore, the lifter 23 continues to rotate in the counterclockwise direction. Figure 6 As shown, the uppermost meshing tooth 6b of the rack 6a meshes with the engaging pin 24, and the driver 6 moves upward. Figure 3 As shown, when the actuator 6 returns to the standby position, the start switch 12a is turned off in response to a command signal from the controller 15. The electric motor 21 is also turned off. This stops the rotation of the lifter 23, and the actuator 6 is held in the standby position. The command signal from the controller 15 is issued based on the count of a timer circuit included in the controller 15.

[0059] As described above, the driving tool 1 has a driver 6 and an elastic body, such as Figure 3 As shown, the driver 6 is arranged in a manner that can move up and down and impacts the driving member n by moving downward; the elastic body applies force downward to the driver 6. The driving tool 1 has an electric motor 21 as a power source (see Figure 2 ) and a lifter 23, wherein the lifter 23 is capable of rotating through the electric motor 21 and overcoming the force of the elastic body to move the driver 6 to the top dead center. The driver 6 has a plurality of meshing teeth 6b arranged in a straight line. The lifter 23 has a plurality of engaging pins 24 and a wheel portion 25, wherein the plurality of engaging pins 24 are arranged along the circumferential direction in a manner capable of engaging with the plurality of meshing teeth 6b; the wheel portion 25 has a plurality of pin support holes 25a, 25d along the circumferential direction for holding each end of the plurality of engaging pins 24. As Figure 14 As shown, the lifter 23 has a grease groove 25b and a grease storage portion 26a, wherein the grease groove 25b is adjacent to the pin support hole 25a supporting the final pin 24a and passes through the wheel portion 25 along the extension direction of the pin support hole 25a; the grease storage portion 26a is recessed in a manner adjacent to the grease groove 25b.

[0060] Therefore, lubricating oil can be supplied from the grease reservoir 26a through the grease groove 25b adjacent to the pin support hole 25a to the surface of the final pin 24a supported by the pin support hole 25a. Thus, the grease groove 25b can supply highly viscous lubricating oil to the surface of the final pin 24a. This can suppress wear of the final pin 24a.

[0061] like Figure 14 As shown, the grease groove 25b is arranged on the side of the contact position between the final pin 24a and the meshing tooth 6b when the driver 6 is moved upward (see Figure 3 As a result, the final pin 24a experiences a high surface pressure at the location where it contacts the meshing teeth 6b. Lubricating oil can therefore be supplied to the area of the surface of the final pin 24a that experiences the high surface pressure. This allows wear of the final pin 24a to be suppressed with a relatively small amount of lubricating oil.

[0062] like Figure 8 、 14 As shown, the driving tool 1 includes a cover 26 mounted on the wheel portion 25 and covering one end of the plurality of pin support holes 25a. A grease reservoir 26a is provided on the cover 26. This allows lubricating oil to be supplied to the surface of the final pin 24a without significantly changing the shape of the lifter 23.

[0063] like Figure 8 、 9 As shown, the cover 26 has an engaging protrusion 26b that projects toward the wheel portion 25. The wheel portion 25 has an engaging recess 25c that engages with the engaging protrusion 26b and restricts rotation of the cover 26 relative to the wheel portion 25. Consequently, the positional relationship between the grease reservoir 26a provided on the cover 26 and the final pin 24a and grease groove 25b provided on the wheel portion 25 is fixed. Consequently, lubricating oil can be constantly supplied from the grease reservoir 26a through the grease groove 25b to the surface of the final pin 24a.

[0064] like Figure 14 As shown, the center of the grease reservoir 26a is eccentric with respect to the central axis 24b of the final pin 24a. Therefore, the final pin 24a is prevented from deviating in the axial direction and entering the grease reservoir 26a. Therefore, the final pin 24a can support the meshing teeth 6b while bearing a large surface pressure (see Figure 3 ).

[0065] like Figure 14 As shown, the center of grease reservoir 26a is located on an extension of grease groove 25b. Thus, grease groove 25b is adjacent to the center of grease reservoir 26a, where it holds more lubricating oil than the edges of grease reservoir 26a. This prevents interruption of lubricating oil supply to the surface of final pin 24a.

[0066] like Figure 3 As shown, the elastic body is a gas sealed in the pressure storage chamber 4a. Therefore, the gas will store a predetermined amount of driving energy even when no driving operation is performed. Therefore, the pin 24a is subjected to a large surface pressure from the meshing teeth 6b. By always being able to draw the grease from the grease reservoir 26a (see Figure 14 ) Lubricating oil is supplied to the surface of the final pin 24a, thereby suppressing the wear of the final pin 24a which is continuously subjected to a large surface pressure.

[0067] like Figure 3 、 4 As shown, the plurality of engagement pins 24 include a final pin 24a that engages with the lowest meshing tooth 6b in a manner that enables the driver 6 to be moved to the top dead center. Figure 14 As shown, grease reservoir 26a and grease groove 25b are positioned adjacent to pin support hole 25a, which holds final pin 24a. This allows lubricant to be supplied particularly to the surface of final pin 24a, which is subject to significant surface pressure. This helps minimize wear on final pin 24a.

[0068] like Figure 9 、 14 As shown, the grease reservoir 26a is hemispherical. Therefore, lubricating oil is less likely to remain at the edge of the grease reservoir 26a. Therefore, lubricating oil can be supplied from the grease reservoir 26a to the grease groove 25b in an uninterrupted manner.

[0069] Then, according to Figure 15 、 16 Next, a driving tool 30 according to a second embodiment of the present invention will be described. Figure 7 The driving tool 1 shown has the lifter 23, and the driving tool 30 has a lifter 31. In the following description, only the structure of the lifter 31 that is different from the lifter 23 will be described in detail.

[0070] like Figure 15 、 16 As shown, the wheel portion 33 has a substantially cylindrical shape and a plurality of engaging pins 32 supported on the wheel portion 33. The plurality of engaging pins 32 are arranged at equal intervals along the outer circumference of the wheel portion 33 with the rotation axis of the wheel portion 33 as the center. The engaging pins 32 are arranged along the rotation axis of the wheel portion 33.

[0071] The locking pin 32 has a cylindrical shape extending in the extension direction. Both ends of the locking pin 32 are supported by pin support holes 33a provided in the wheel portion 33. The locking pin 32 is rotatable about its central axis. Two pin support holes 33a are arranged side by side along the extension direction of the locking pin 32. The pin support holes 33a pass through the wheel portion 33.

[0072] like Figure 15 、16 As shown, the lifter 23 has a first cover 34 and a second cover 35 that are mounted on the wheel portion 33 and cover one end of the pin support hole 33a. The first cover 34 is mounted on the bearing 28 side. The second cover 35 is mounted on the bearing 27 side. Although not shown in the figure, the first cover 34 and the second cover 35 have an engaging protrusion protruding toward the wheel portion 33 on the inner surface side facing the wheel portion 33. The wheel portion 33 has an engaging recessed portion that is recessed in a manner that can engage with the engaging protrusion 26b of the first cover 34 and the second cover 35. Therefore, the first cover 34 and the second cover 35 are mounted on the wheel portion 33 in a non-rotatable manner. By mounting the first cover 34 and the second cover 35 on the wheel portion 33, the two ends of the engaging pin 32 can be prevented from detaching.

[0073] like Figure 15 、 16 As shown, the plurality of engagement pins 32 have a final pin 32a, which enables the driver 6 (see Figure 3 ) moves upward from the standby position to the top dead center. The diameter of the final pin 32a is larger than that of the other engagement pins 32.

[0074] like Figure 16 As shown in FIG. 1 , grease grooves 33b are provided adjacent to the two pin support holes 33a supporting the final pin 32a. The grease grooves 33b extend along the through-going direction of the pin support holes 33a and penetrate the wheel portion 33. The grease grooves 33b are provided between the final pin 32a and the bottommost meshing tooth 6b (see FIG. 1 ). Figure 3 ) on the side of the meshing. Grease groove 33b is Figure 16 The middle is provided on the right side of the final pin 32a.

[0075] like Figure 16 As shown, the first and second covers 34 and 35 have hemispherical recessed grease reservoirs 34a and 35a on their inner surfaces facing the wheel portion 33. High-viscosity lubricating oil is enclosed in the grease reservoirs 34a and 35a for supplying to the surface of the final pin 32a. When the first and second covers 34 and 35 are attached to the wheel portion 33, the grease reservoirs 34a and 35a are adjacent to the grease groove 33b and the end of the final pin 32a. The grease reservoirs 34a and 35a are designed to be sized so as not to exceed the diameter of the final pin 32a. The centers of the grease reservoirs 34a and 35a are eccentric with respect to the central axis 32b of the final pin 32a and are located on an extension of the grease groove 33b.

[0076] Various modifications can be made to the embodiments described above. The examples illustrate the application of the lifters 23 and 31 to gas spring-type driving tools 1 and 30. Alternatively, for example, the lifters can be applied to mechanical spring-type driving tools that use the force of a compression spring as a thrust force. The examples illustrate the controller 15 using a timer circuit to determine the stage at which the driver 6 has returned to the standby position. Alternatively, for example, the controller 15 can measure the rotation angle of the electric motor 21 and, based on this, calculate the rotation angle of the lifter 23 to determine the stage at which the driver 6 has returned to the standby position.

[0077] The example shows a grease reservoir 26a provided on the bearing 28 side relative to the final pin 24a. Alternatively, the grease reservoir may be provided on the bearing 27 side relative to the engaging pin 24. The example shows grease reservoirs 26a, 34a, and 35a and grease grooves 25b and 33b that supply lubricating oil only to the final pins 24a and 32a. Alternatively, a grease reservoir and grease groove that supply lubricating oil to each of the multiple engaging pins may be provided adjacent to all of the engaging pins. Furthermore, a grease reservoir and grease groove that supply lubricating oil to a portion of the multiple engaging pins may be provided. The grease reservoir is not limited to a hemispherical shape; for example, a groove with a semicircular cross-section extending along the circumference of the wheel portion 25 and 33 and adjacent to the multiple engaging pins 24 and 32 may be provided.

Claims

1. A driving tool, characterized in that: It has a driver, an elastic body, an electric motor and a lifter, wherein: The driver is arranged in a manner that it can move up and down and impacts the driven member by moving downward; The elastic body applies downward force to the driver; The electric motor serves as a power source; The lifter can be rotated by the electric motor and overcome the force of the elastic body to move the driver to the top dead center. The driver has a plurality of meshing teeth arranged in a straight line. The lifter has a plurality of engaging pins, a wheel portion, a grease groove and a grease reservoir, wherein: The plurality of engagement pins are arranged along the circumferential direction in a manner capable of engaging with the plurality of meshing teeth; The wheel portion is provided with a plurality of pin support holes along the circumferential direction for holding both ends of the plurality of engagement pins; The grease groove is adjacent to at least one of the plurality of pin support holes and passes through the wheel portion along an extending direction of the pin support hole; The grease reservoir is recessed so as to be adjacent to the grease groove. The grease groove is defined by the inner surface of the plurality of pin support holes, is parallel to the longitudinal direction of the plurality of engagement pins and extends along the entire length of the inner surface, and receives grease from the grease reservoir. The grease reservoir directly overlaps a portion of the pin support hole at one end of the pin support hole in a direction parallel to the longitudinal direction.

2. The driving tool according to claim 1, characterized in that The grease groove is arranged on a side of a contact position between the engagement pin and the meshing teeth when the actuator is moved upward.

3. The driving tool according to claim 1 or 2, characterized in that A cover is provided, the cover being mounted on the wheel portion and covering one end of the plurality of pin support holes, The grease reservoir is provided on the cover.

4. The driving tool according to claim 3, characterized in that The cover has an engaging protrusion protruding toward the wheel portion, The wheel portion includes an engaging recess that engages with the engaging protrusion and restricts rotation of the cover relative to the wheel portion.

5. The driving tool according to claim 1 or 2, characterized in that The center of the grease reservoir is eccentric with respect to the central axis of the engagement pin.

6. The driving tool according to claim 1 or 2, characterized in that The center of the grease reservoir is arranged on an extension line of the grease groove.

7. The driving tool according to claim 1 or 2, characterized in that The elastic body is fluid.

8. The driving tool according to claim 1 or 2, characterized in that The plurality of engagement pins include a final pin that engages with any one of the plurality of meshing teeth in a manner capable of moving the driver to a top dead center. The grease reservoir and the grease groove are provided adjacent to the pin support hole that holds the final pin.

9. The driving tool according to claim 1 or 2, characterized in that The grease reservoir is hemispherical.

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