JPH0666967U - Driving mode switching device for driving machine - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent inadvertent switching of the operating mode of the driving tool. [Structure] The contact lever 8 is slidable on its support shaft 27 so as to be stopped at either a first or second sliding stop position corresponding to the first and second rotation stopping positions thereof, respectively. To support. Provided inside the trigger lever 7 is a convex portion 28 that comes into contact with the contact lever at one of the first and second sliding stop positions of the contact lever and restricts its rotation. A switching lever 29 for selectively switching the contact lever between the first and second sliding stop positions,
It is attached to the support shaft 27. Since the rotating direction of the contact lever and the trigger lever and the sliding direction of the switching lever intersect, the switching lever does not move during the operation of the trigger lever.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a device for switching the driving operation mode of a driving tool.

[0002]

[Prior art]

 In a driving machine such as a nail driving machine, for example, as shown in Japanese Utility Model Laid-Open No. 61-172783, it is possible to freely change the operation mode when driving a fastener such as a nail into a material to be driven. There is something. This operation mode requires a single shot that requires pulling or releasing the trigger lever each time the stopper is driven into the material to be driven, and a hammering tool every time the stopper is driven with the trigger lever being pulled. There is continuous hammering, in which the material to be driven is pressed.

The driving machine is provided with a switching lever for switching the operation mode, and by operating this switching lever, the contact lever pivotally supported by the trigger lever is operated by the contact lever. It can be switched between motion stop positions. By changing the rotation stop position of the contact lever, the operation of the trigger valve is changed and the driving operation mode is switched.

[0004]

[Problems to be solved by the device]

 However, since the conventional switching lever is rotated by rotating the operation knob provided on the surface of the side wall of the trigger lever, it is easy for a finger or the like to touch the operation knob during the driving operation. , The switching lever may be inadvertently switched.

Further, since the direction in which the operation knob is moved is the same as the direction in which the trigger lever is pulled, there is a possibility that the trigger lever may be pulled by mistake when the operation knob is moved.

Further, the switching lever is liable to fall down due to the force applied from the contact lever, and there is a risk that the driving operation mode is inadvertently changed.

[0007]

[Means for Solving the Problems]

 In order to solve the above problems, the present invention provides a device for switching the driving operation mode of a driving machine by switching a contact lever pivotally supported by a trigger lever of the driving machine between its first and second rotation stop positions. In the above, the contact lever is slidable on its support shaft so as to stop at any of the first and second sliding stop positions corresponding to the first and second rotation stop positions, respectively. A protrusion is provided inside the trigger lever that is supported and that contacts the contact lever at one of the first and second sliding stop positions of the contact lever and restricts its rotation. By adopting a construction in which a switching lever for selectively switching the contact lever to one of the first and second sliding stop positions by sliding is attached to the spindle.

[0008]

[Action]

 When switching the driving operation mode of the driving tool, the switching lever is slid on the support shaft and shifted from one sliding stop position to the other sliding stop position.

As a result, the contact lever is switched from the one rotation stop position to the other rotation stop position. In the contact lever, the contact state with the convex portion provided inside the trigger lever becomes the non-contact state or vice versa, and the rotation stop position changes.

When the rotation stop position of the contact lever changes, the cooperative relationship between the contact lever and the trigger valve also changes, and the operation mode of the driving tool is switched. In this way, the switching lever slides on the support lever support shaft when the operation mode is changed, and the sliding direction intersects the trigger lever pulling direction and moves in different directions. Therefore, the switching lever does not malfunction.

Further, since the contact lever abuts on the convex portion fixedly provided inside the trigger lever at one rotation stop position, the contact arm can be urged stably.

[0012]

【Example】

 An embodiment of a driving operation mode switching device for a driving machine according to the present invention will be described below with reference to the drawings.

As shown in FIGS. 1 and 2, this driving machine has a housing 1 as an outer shell thereof, a piston 3 holding a driver 2 for hitting a fastener such as a nail, and a piston 3 for sliding the piston 3. By opening and closing a cylinder 4 which is movably housed and mounted in the housing 1 and one end of the cylinder 4, compressed air is introduced and discharged to and from the cylinder 4 to reciprocate the piston 3. A main valve device 5 to be operated, a trigger valve 6 attached to the housing 1 for operating the main valve device 5, and a trigger lever 7 for operating the trigger valve 6 pivotally supported by the housing 1. When the trigger valve 6 is operated, the contact lever 8 rotatably supported by the trigger lever 7 that cooperates with the trigger lever 7 and the tip 9a of the contact lever 8 are driven. The contact arm 9 has a contact arm 9 protruding forward from the tip of the machine and having a rear end 9b facing the trigger lever 7.

The housing 1 has an upper part for accommodating the cylinder 4 in a horizontal direction, and a lower part connected to the upper part in a vertical direction to form a grip portion 1 a. A magazine 10 for supplying a fastener such as a nail is attached to the front portion of the upper portion of the housing 1. The inside of the holding portion 1a of the housing 1 is a compressed air chamber 11 in which compressed air is stored.

The piston 3 horizontally supports the driver 2 at the front end thereof, and the driver 2 reciprocates in the upper part of the housing 1 as the piston 3 reciprocates, and a stopper supplied from the magazine 10. Is ejected from the front end of the upper part of the housing 1.

A return air chamber 12 is formed between the cylinder 4 and the housing 1 to store air used for returning the piston 3. The rear end portion of the cylinder 1 is an opening communicating with the compressed air chamber 11, and the opening is opened and closed by the main valve device 5.

The main valve device 5 has a main valve 13 slidably accommodated in the rear part of the housing 1. The main valve 13 can be brought into contact with or separated from the edge of the opening of the cylinder 1, and when the opening is opened, the compressed air in the compressed air chamber 11 is made to flow into the cylinder 4 to close the opening of the cylinder 4. At times, compressed air is discharged from the cylinder 4 into the atmosphere. The main valve 13 is constantly urged by a spring 14 to close the cylinder opening.

A main valve chamber 15 of the main valve device 5 is formed between the main valve 13 and the rear end of the housing 1. The main valve chamber 15 is connected to the compressed air chamber 11 via a ventilation path 16. When compressed air is supplied from the ventilation passage 16 to the main valve chamber 15, the pressure of the compressed air causes the main valve 13 to move to the opening side of the cylinder 4 to close the opening. On the contrary, when the compressed air in the main valve chamber 15 is discharged from the ventilation passage 16, the compressed air from the compressed air chamber 11 pushes open the main valve 13, flows into the cylinder 4, and moves the piston 3 forward. Let

The trigger valve 6 introduces, discharges or encloses compressed air into the main valve chamber 15 of the main valve device 5 to close, open or maintain the closed operation of the main valve 13. It is intended to do that, and has the following structure.

That is, the trigger valve 6 has a valve cylinder 17 laterally fixed to the front side of the grip portion 1 a of the housing 1, and a trigger valve stem 18 slidably accommodated in the valve cylinder 17. is doing.

In the valve cylinder 17, a compressed air introduction hole 19, a supply / exhaust hole 20, and an exhaust hole 21 are formed in order from the rear part to the front part. The compressed air introduction hole 19 is for introducing the compressed air in the compressed air chamber 11 into the valve cylinder 17, and the supply / exhaust air hole 20 is for communicating the ventilation passage 16 with the valve cylinder 17, The pores 21 open the inside of the valve cylinder 17 to the atmosphere.

The trigger valve stem 18 is constantly urged forward of the valve cylinder 17 by a spring 22 housed in the rear portion of the valve cylinder 17. A stem 18a is provided at the front of the trigger valve stem 18, and the stem 18a projects outward from the valve cylinder 17 and faces the back of the trigger lever 7.

The trigger valve stem 18 is provided with first, second, and third valves 23, 24, and 25, each of which is an O-ring that can be brought into close contact with the inner wall surface of the valve cylinder 17, from the front to the rear. Has been. Each of the valves 23, 24, 25 is for introducing, discharging or enclosing compressed air into the main valve chamber 15 when the trigger valve stem 18 is stopped at each of the first, second and third positions. The main valve 13 can be closed, opened, or maintained closed. That is, as shown in FIGS. 3, 4, 5, 7, 8, 9, and 10, the first position is such that the trigger valve stem 18 is advanced to the forefront in the valve cylinder 17. Position, the first and second valves 23, 24 connect the ventilation passage 16 to the compressed air chamber 11 via the compressed air introduction hole 19, and the third valve 25 blocks the ventilation passage 16 from the exhaust hole 21. It is supposed to do. As shown in FIGS. 6 and 11, the second position is a position in which the trigger valve stem 18 is retracted to the rearmost part in the valve cylinder 17, and the second valve 24 is arranged in the vent passage 16 and the compressed air chamber. The third valve 25 connects the ventilation passage 16 and the exhaust hole 21 with each other by shutting off the connection between the ventilation passage 16 and the exhaust hole 21. In the third position, as shown in FIG. 12, the second and third valves 24 and 25 seal the air passage 16 and shut off the air passage 16 from both the compressed air chamber 11 and the exhaust hole 21. It is like this.

Therefore, at the first position, the compressed air in the compressed air chamber 11 flows into the main valve chamber 15 through the air supply / exhaust hole 20 and the air passage 16, and opens the main valve 13 in the opening of the cylinder 4. And the inside of the cylinder 4 is sealed. In the second position, the compressed air in the main valve chamber 15 is discharged into the atmosphere through the air passage 16, the air supply / exhaust hole 20, and the exhaust hole 21, so that the compressed air in the compressed air chamber 11 is released. Apply to one side of 13 and open. As a result, compressed air flows into the cylinder 4 to actuate the piston 3, causing the driver 2 in front of the piston 3 to drive the stopper. When the trigger valve stem 18 returns to the first position, the compressed air in the compressed air chamber 11 is introduced into the main valve chamber 15 through the compressed air introduction hole 19 and the ventilation passage 16, and the main valve 13 is opened. Close it. As a result, the inside of the cylinder 4 is released into the atmosphere, and the piston 3 is returned to the position shown in FIG. When the trigger valve stem 18 moves from the second position to the third position, the compressed air chamber 11 and the ventilation passage 16 are blocked, and the exhaust hole 21 and the ventilation passage 16 are blocked. The driving state remains suspended.

The trigger lever 7 is supported on the housing 1 by a support shaft 26 so as to be rotatable in the front-rear direction. The contact lever 8 is rotatably supported in the lower part of the trigger lever 7 via another support shaft 27 parallel to the support shaft 26 so as to be rotatable in the front-rear direction, and the back surface of the intermediate portion thereof faces the stem 18a of the trigger valve 6. The front surface of the upper part faces the rear end 9b of the contact arm 9.

The tip end 9 a of the contact arm 9 projects forward from the tip end of the driving machine for driving the stopper, the rear end portion 9 b faces the contact lever 8, and the middle portion of the contact arm 9 is of the housing 1. It is arranged along the outer surface. The contact arm 9 is constantly urged forward by a spring (not shown).

The trigger lever 7, the contact lever 8 and the contact arm 9 operate in cooperation with each other to operate the trigger valve 6 and stop the trigger valve stem 18 at any of the first, second and third positions. It is designed to let you. The third position is selected by switching the contact lever 8 between its first and second rotation stop positions, and the third position of the trigger valve stem 18 is selected. If so, the drive is converted to a single-shot drive mode, and if the third position is not selected, the drive is converted to a continuous drive mode.

The trigger lever 7 is provided with a device for switching the driving operation mode of such a driving machine. That is, as shown in FIGS. 13 to 21, the contact lever 8 has one of the first and second sliding stop positions corresponding to the first and second rotation stop positions, respectively. It is slidably supported by the support shaft 27 so as to stop, and contacts the contact lever 8 at one of the first and second sliding stop positions of the contact lever 8 to regulate its rotation. A protrusion 28 is provided inside the trigger lever 7 and slides on the support shaft 27 to selectively switch the contact lever 8 to either the first or second sliding stop position. A switching lever 29 is attached to the support shaft 27.

The contact lever 8 is a flat plate portion 8 a that is narrower than the back surface of the finger hook portion 7 a of the trigger lever 7 and that protrudes from the left and right sides of the flat plate portion 8 a to the front side. Side wall portions 8b and 8c facing the side wall portions 7b and 7c. The contact lever 8 is slidable along the support shaft 27, and the position where one side wall portion 8c of the contact lever 8 abuts one side wall 7c of the trigger lever 7 is the first sliding stop position described above. The position where the other side wall portion 8b contacts the other side wall portion 7b of the trigger lever 7 corresponds to the second slide stop position.

The convex portion 28 is a fin-shaped piece projecting on the back surface of the finger-holding portion 7a of the trigger lever 7, and is provided on the flat plate portion 8a of the contact lever 8 when the contact lever 8 is stopped at the first sliding stop position. The contact lever 8 comes into contact with the end edges of the left and right side walls 8b and 8c when the contact lever 8 stops at the second sliding stop position.

The switching lever 29 has a size to be housed in a cavity between the flat plate portion 8 a of the contact lever 8 and the left and right side wall portions 8 b 1 and 8 c and is slidable with respect to the support shaft 27. Is attached to the lower end of the trigger lever 7 to form a finger hook 29a. Therefore, when a finger is put on the finger hook 29a and the switching lever 29 is slid to the left or right on the support shaft 27, the contact lever 8 also slides to the left or right on the support shaft 27.

Further, a projection 30 is formed at the other end of the switching lever 29 so as to project toward the back surface of the finger hook 7 a of the trigger lever 7. On the back surface of the finger hook 7a, recesses 31 and 32 that engage with the projection 30 are provided at two positions on the left and right. Both the concave portions 31 and 32 correspond to the first and second sliding stop positions, respectively, and when the switching lever 29 is stopped to one side, the projection 30 engages with the one concave portion 31 to move the switching lever 29. When stopped on the other side, the projection 30 engages with the recess 32 on the other side. A tongue-shaped spring piece 33 that comes into contact with the back surface of the finger-holding portion 7a of the trigger lever 7 is provided on the side opposite to the protrusion 30 with the support shaft 27 of the switching lever 29 as the center. The protrusions 30 of the switching lever 29 are biased toward the recesses 31, 32 by the strips 33, and are selectively engaged with either of the recesses 31, 32.

Next, the movement of the above-mentioned driving machine will be described separately for the case of single shot and the case of continuous shot, including the operation of the driving operation mode switching device. In the case of continuous striking, as shown in FIGS. 3, 4, 13, and 14, the contact lever 8 is set to the first sliding stop position where the flat plate portion 8a can abut the convex portion 28.

Then, the contact arm 8 is applied to the material to be driven so that the driving machine is pressed against the material to be driven. As a result, the contact arm 8 moves rearward, and the rear end 9b of the contact arm 8 contacts the contact lever 8 to rotate the contact lever 8 rearward (FIG. 5).

Next, as shown in FIG. 6, the trigger lever 7 is pulled and operated. The trigger valve stem 18 moves to the above-mentioned second position and is driven. After the driving is completed, when the driving machine is separated from the material to be driven, the contact arm 9 returns to its original position as shown in FIG. 7, and the trigger valve stem 18 is moved by the restoring force of the spring 22 in the trigger valve 6. Return to the first position.

When the driving tool is pressed against the material to be driven in this state, the state shown in FIG. 6 is obtained and the driving is performed again. When changing from the continuous hitting operation mode to the single hitting operation mode, first, the finger hook piece 29a of the switching lever 29 is pushed in the direction opposite to the direction of pulling the trigger lever 7 against the force of the spring piece 33, and the projection 30 is pressed. And the engagement state with one of the recesses 32 is released (FIGS. 16 and 17). Then, the switching lever 29 is slid in the left-right direction while pressing the finger hook 29a, and the protrusion 30 faces the other recess 31 (FIGS. 18 and 19). Then, when the finger is released from the finger hooking piece 29a, the projection 30 engages with the recess 31 due to the restoring force of the spring piece 33 (FIGS. 20 and 21). At the same time, the edges of the side walls 8b and 8c of the contact lever 8 contact the convex portion 28, and the rotation stop position of the contact lever 8 is displaced rearward more than in the continuous hitting (FIG. 8).

In the case of a single shot , as shown in FIGS. 8 and 9, the contact lever 8 is set to the second slide stop position where the side walls 8b and 8c of the contact lever 8 can abut the convex portion 28.

When the contact arm 9 is brought into contact with the material to be driven and the driving machine is pressed against the material to be driven, the contact arm 9 moves rearward, and its rear end 9b abuts on the contact lever 8 to move the contact lever 8 rearward. (Fig. 10).

Next, as shown in FIG. 11, the trigger lever 7 is pulled and operated. The trigger valve stem 18 moves to the above-mentioned second position and is driven. After the driving is completed, when the driving machine is separated from the material to be driven, the contact arm 9 returns to the original position, but the contact lever 8 stops at the second rotation stop position by the convex portion 28, so that the trigger valve stem 18 Movement is interrupted and locked in the third position described above (Fig. 12). At the third position, the ventilation passage 16 is blocked from both the compressed air chamber 11 and the exhaust hole 21, so that compressed air is not supplied to the air supply / exhaust hole 20 and the ventilation passage 16, and the cylinder 4 is The compressed air continues to be sent from the compressed air chamber 11, and the piston 3 cannot return from the front. If the driving tool is pressed against the material to be driven again in this state, the trigger valve stem 18 will be in the second position (Fig. 6), but it means that the piston 3 is driven again because the piston 3 has not returned to the rear. Absent.

[0040]

[Effect of device]

 As described above, according to the present invention, when changing the operation mode, the switching lever is slid on the support shaft of the contact lever, and the sliding direction intersects the pulling direction of the trigger lever and moves in the moving direction. Since they are different from each other, the switching lever does not malfunction.

Further, since the contact lever abuts on the convex portion fixedly provided inside the trigger lever at the one rotation stop position, the contact arm is stably urged to prevent unintentional switching. I can do things.

[Submission date] April 25, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0002

[Correction method] Change

[Correction content]

[0002]

[Prior art]

In a driving machine such as a nail driving machine, for example, as shown in Japanese Utility Model Laid-Open No. 61-172783, it is possible to freely change the operation mode when driving a fastener such as a nail into a material to be driven. There is something. This operation mode includes a single shot that requires pulling and releasing the trigger lever each time the stopper is driven into the material to be driven, and a hammering tool each time the stopper is driven while the trigger lever is pulled. There is continuous punching in which the material is pressed toward the driven material.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0013

[Correction method] Change

[Correction content]

As shown in FIGS. 1 and 2, this driving machine has a housing 1 as an outer shell thereof, a piston 3 holding a driver 2 for hitting a fastener such as a nail, and a piston 3 for sliding the piston 3. By opening and closing a cylinder 4 which is movably housed and mounted in the housing 1 and one end of the cylinder 4, compressed air is introduced and discharged to and from the cylinder 4 to reciprocate the piston 3. a main valve unit 5 for moving, main valve device a trigger valve 6 attached to the housing 1 for operating the 5, trigger lever for operating the trigger valve 6 which is pivotally supported on housings 1 7 When the trigger valve 6 is operated, the contact lever 8 rotatably supported by the trigger lever 7 that cooperates with the trigger lever 7 and the tip 9a of the contact lever 8 are provided. Protrudes from the tip of the saw machine other party, the rear end 9b has a contact arm 9 which is opposite to the trigger lever 7.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0031

[Correction method] Change

[Correction content]

The switching lever 29 has a size to be housed in a cavity between the flat plate portion 8 a of the contact lever 8 and the left and right side wall portions 8 b 1 and 8 c and is slidable with respect to the support shaft 27. Is attached to the lower end of the trigger lever 7 to form a finger hook 29a. Therefore, when a finger is put on the finger hanging piece 29a to push the finger hanging piece 29 forward, and the switching lever 29 is slid to the left or right on the support shaft 27, the contact lever 8 also moves on the support shaft 27. Will slide to the left or right.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0033

[Correction method] Change

[Correction content]

Next, the movement of the above-mentioned driving machine will be described separately for the case of single shot and the case of continuous shot, including the operation of the driving operation mode switching device. In the case of continuous striking, as shown in FIGS. 3, 4, 13, and 14, the contact lever 8 is set to the first sliding stop position where the flat plate portion 8a thereof can abut the convex portion 28.

[Brief description of drawings]

FIG. 1 is a side view of a front portion of a driving machine including a driving operation mode switching device according to the present invention.

FIG. 2 is a partially cutaway side view of a rear portion of the driving tool.

FIG. 3 is a sectional view of the driving operation mode switching device in a non-operating state in a continuous driving mode.

FIG. 4 is a view on arrow IV in FIG.

FIG. 5 is a cross-sectional view when the contact arm is operating in the continuous driving mode of the driving mode switching device.

FIG. 6 is a cross-sectional view at the time of driving in the continuous driving mode of the driving mode switching device.

FIG. 7 is a cross-sectional view of the driving operation mode switching device in a continuous driving mode when a contact arm is not operated.

FIG. 8 is a cross-sectional view of the driving operation mode switching device when not operating in a single shot mode.

9 is a view on arrow IX in FIG.

FIG. 10 is a cross-sectional view of the driving operation mode switching device when the contact arm operates in a single-shot mode.

FIG. 11 is a cross-sectional view of the driving operation mode switching device when driving in a single shot mode.

FIG. 12 is a cross-sectional view of the above-mentioned driving operation mode switching device when driving is prevented in a single shot mode.

FIG. 13 is a cross-sectional view of a main part of the driving operation mode switching device under a continuous driving mode.

14 is a view on arrow XIV in FIG.

FIG. 15 is a sectional view taken along line XIV-XIV in FIG.

FIG. 16 is a cross-sectional view of a main part of the switching device when the continuous beating operation mode is being released.

17 is a view on arrow XVII in FIG.

FIG. 18 is a cross-sectional view of a main part of the switching device when the single shot driving mode is being set.

FIG. 19 is a view on arrow XIX in FIG. 18.

FIG. 20 is a sectional view of an essential part of the driving operation mode switching device under a single-shot driving mode.

FIG. 21 is a view on arrow XXI in FIG. 20.

[Explanation of symbols]

 7 ... Trigger lever 8 ... Contact lever 27 ... Spindle 28 ... Convex part 29 ... Switching lever

Claims (1)

[Scope of utility model registration request] 1. A device for switching a driving operation mode of a driving machine by switching a contact lever pivotally supported by a trigger lever of the driving machine between its first and second rotation stop positions, the contact lever comprising: , The slide lever is slidably supported by the support shaft so as to stop at either of the first and second sliding stop positions corresponding to the first and second rotation stop positions, respectively, and At one of the first and second sliding stop positions, a convex portion that comes into contact with the contact lever and restricts its rotation is provided inside the trigger lever, and slides on the support shaft, thereby A driving lever for driving a driving machine, characterized in that a switching lever for selectively switching the contact lever between the first and second sliding stop positions is attached to the support shaft. Replacement device.