JP3635866B2 - Automatic / manual switchable wrench - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to an automatic / manual switchable wrench capable of selectively or automatically performing tightening or loosening of bolts / nuts or screws.
[0002]
[Prior art]
Conventionally, tools used for tightening and loosening bolts, nuts, screw rods, etc. in assembly and connection of various products include manual hydraulic torque wrench, ratchet wrench, pneumatically operated impact wrench, etc. It is used.
[0003]
[Problems to be solved by the invention]
However, the conventional wrench described above still has the following problems to be solved.
In other words, in the case of manual hydraulic torque wrench and ratchet type wrench, many bolts, nuts and screws are manually tightened and loosened on the production line of machinery, etc. If the bolts, nuts and screws are automatically tightened or loosened using pneumatic pressure, etc., it is difficult to manage the torque. If the torque adjustment fails, the bolts, nuts, screws, etc. Could be damaged.
The present invention has been made in view of such circumstances, and can be easily switched between automatic and manual by a trigger interlocking mechanism attached to a handle. Bolts, nuts, screws, and the like can be made with a slight torque adjustment error. An object of the present invention is to provide an automatic / manual switchable wrench that can be tightened / loosened without damage.
[0004]
[Means for Solving the Problems]
To achieve the above object, an automatic / manual switchable wrench according to claim 1 is provided.
A handle consisting of a shaft rod,
An air motor attached to the tip of the handle and having a rotation axis in a direction perpendicular to the axis of the handle;
An attachment detachably attached to the tip of the rotating shaft;
A stopper provided with a clamp piece disposed in the handle so as to be movable back and forth in the axial direction and capable of clamping the rotary shaft at the front portion;
An on-off valve provided with a pressure reducing valve for setting the primary supply pressure of the compressed gas supplied to the handle and attached to the handle to a predetermined pressure, and a pressure gauge for displaying the supply pressure, and for controlling supply / stop of the compressed gas When,
A trigger whose base is rotatably attached to the outer peripheral surface of the handle about the pivot axis in the front-rear direction;
The stopper is advanced and retracted in conjunction with the rotation of the trigger, and is removably inserted into a protrusion insertion hole provided at a circumferential interval on the outer peripheral surface of the rotary shaft by the clamp piece ,
A trigger interlocking mechanism for performing clamping and releasing thereof and opening and closing the on-off valve;
Comprising
By rotating the trigger in the pulling direction,
The clamp of the rotary shaft by the clamp piece is released, the open / close valve is opened, compressed gas is supplied to the air motor, the attachment can be rotated together with the rotary shaft, and the trigger rotates in the return direction. By
The rotation of the attachment can be stopped by clamping the rotary shaft by the clamp piece and closing the open / close valve to stop the supply of compressed gas to the air motor.
[0005]
The automatic / manual switchable wrench according to claim 2 is the automatic / manual switchable wrench according to claim 1, wherein a spring is disposed at a rear portion of the handle, and the biasing force of the spring causes the stopper to be The clamp piece is biased toward the rotating shaft.
[0006]
The automatic / manual switchable wrench according to claim 3 is the automatic / manual switchable wrench according to claim 1 or 2, wherein the trigger interlocking mechanism pivots one end of a crank link by a pivot at the tip of the trigger. The other end of the crank link is pivotally supported on the stopper by a pivot, and the stopper is advanced and retracted through the crank link by rotation of the trigger, and a cam surface is provided on a peripheral surface of the trigger, and the cam One end of a valve rod capable of reciprocating in a direction perpendicular to the axis of the handle is brought into contact with the surface, the other end of the valve rod is brought into contact with a valve body for opening and closing the valve seat of the on-off valve, and the rotation of the trigger Thus, the valve body can be moved in the axial direction to open and close the on-off valve.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail with reference to an embodiment shown in the accompanying drawings. (Overall configuration of wrench A that can be switched automatically and manually)
First, an overall configuration of a wrench A capable of automatic / manual switching according to an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a front view of a wrench A that can be switched automatically and manually when a handle is held in a horizontal state to tighten or loosen bolts, nuts, screws, etc., and FIG. FIG. 3 is a plan view taken along the line I-II, and FIG. 3 is a side view taken along the line II-II in FIG.
[0008]
As shown in FIGS. 1 to 3, an air motor 12 having a rotary shaft 11 in a direction perpendicular to the axis of the handle 10 is provided at the front portion of the handle 10 formed of a large-diameter shaft rod arranged in a horizontal state. It is attached. An attachment 14 engaged with the head of the bolt B is detachably attached to the tip of the rotating shaft 11. The attachment 14 is rotated integrally with the rotating shaft 11 by the operation of the air motor 12. .
[0009]
As shown in FIG. 1, a stopper 15 made of a long shaft rod is disposed in the handle 10 so as to be movable back and forth in the axial direction, and a small-diameter protrusion as an example of a clamp piece is provided at the tip of the stopper 15. 16 is provided. The small-diameter protrusion 16 is detachably inserted into a protrusion insertion hole 17 provided at a circumferential interval on the outer peripheral surface of the rotary shaft 11 in conjunction with the advance / retreat of the stopper 15. And the rotation of the rotating shaft 11 can be regulated.
As shown in FIG. 1, an opening / closing valve 13 for controlling supply / stop of compressed gas supplied to the air motor 12 is attached to the top surface of the front portion of the handle 10.
As shown in FIG. 1, a trigger 18 is attached to the lower surface of the front portion of the handle 10 so as to be rotatable around a pivot 19 in the front-rear direction. In addition, the handle 10 is attached with a trigger interlocking mechanism 20 that advances and retracts the stopper 15 in conjunction with the rotation of the trigger 18, clamps and releases the rotary shaft 11 with a clamp piece, and opens and closes the on-off valve 13. ing.
[0010]
(Configuration of each part)
Next, with reference to FIGS. 1-7, the structure of each part of the wrench A which has the above-mentioned whole structure and can be switched automatically and manually will be described.
First, the handle 10 will be described. As shown in FIG. 1, a small-diameter first through hole is formed inside the handle 10 composed of a large-diameter shaft rod arranged in a horizontal state, except for its tip. 21 and a large-diameter second through hole 22 are provided on the axis of the handle 10. A through hole 23 extending in a direction perpendicular to the axis of the handle 10 is provided at the front portion of the handle 10, and the rear portion of the through hole 23 communicates with the front portion of the small diameter through hole 21. A grip surface 24 for a user to grip the handle 10 is formed on the outer peripheral surface of the rear portion of the handle 10.
[0011]
Next, the air motor 12, its rotating shaft 11, and attachment 14 will be described. As shown in FIG. 1, the rotating shaft 11 of the air motor 12 is rotatable in the through hole 23 via upper and lower bearings 25 and 26. The air motor 12 is fixed to the upper surface of the tip of the handle 10. As shown in FIG. 4, a plurality of protrusion insertion holes 17 are provided on the outer peripheral surface of the upper portion of the rotating shaft 11 at intervals in the circumferential direction. The tip of the rotating shaft 11 extends downward from the through hole 21, and the base of the attachment 14 is attached to the extension end, and the tip of the attachment 14 is engaged with the head of the bolt B. An engagement hole 27 is provided.
[0012]
Next, the stopper 15 will be described. As shown in FIG. 1, a long stopper 15 is disposed in the first through hole 21 having a small diameter provided in the handle 10 so as to be movable back and forth in the axial direction (P direction). It is installed. A small-diameter protrusion 16 is provided at the tip of the stopper 15, and this small-diameter protrusion 16 is inserted into a protrusion insertion hole 17 provided on the rotary shaft 11 as a clamp piece in the case of automatic operation, as will be described later. Thus, the rotation of the rotating shaft 11 can be restricted, and in the case of manual operation, the rotating shaft 11 can be rotated by being detached from the protrusion insertion hole 17. Further, a stopper advancement restriction plate 28 is attached to the rear portion of the stopper 15, and the stopper advancement restriction plate 28 has a tip portion of a spring 29 disposed in the second through hole 22 having a large diameter. It is elastically contacted. Therefore, the stopper 15 is constantly urged toward the rotating shaft 11 by the spring 29, and excessive advancement of the stopper 15 is restricted by the stopper advancement amount restricting plate 28. As shown in FIG. 1, a spring guide 29 a is coaxially attached to the rear portion of the stopper 15, and a spring receiving plug 30 is attached to the rear end of the handle 10.
[0013]
Next, the opening / closing valve 13 for controlling the supply / stop of the compressed gas supplied to the air motor 12 will be described. As shown in FIGS. 1 and 3, the position on the upper surface of the front part of the handle 10 and the rear part of the air motor 12. The valve casing 31 is integrally attached to the.
[0014]
A valve chamber 32 is formed inside the valve casing 31, and a compressed gas supply port 33 provided in the upper portion of the valve chamber 32 is connected to a compressed gas supply main pipe 35 through a pressure reducing valve 36. A pressure gauge 34 is connected to the pressure reducing valve 36. On the other hand, a compressed gas outlet 37 is provided at one side of the valve chamber, and this compressed gas outlet 37 is compressed by a switching valve 52 provided at the top of the air motor 12 via a compressed gas supply pipe 38. The gas inlet 39 is connected in communication. The switching valve 52 is used for rotating the rotating shaft 11 forward and backward, and includes a switching lever 53. In addition, a valve ball 40 that opens and closes the compressed gas outlet 37 by a valve rod 50 described later is disposed in the valve chamber 32. Further, a spring 40 a that constantly biases the valve ball 40 toward the valve rod 50 is disposed in the valve chamber 32. Therefore, as will be described later, during automatic operation, the valve rod 50 is advanced into the valve chamber 32 to separate the valve ball 40 from the compressed gas outlet 37, thereby opening the compressed gas outlet 37 and switching the compressed gas to the switching valve 52. In the manual operation, the valve rod 50 is retracted, the compressed gas outlet 37 is closed by the valve ball 40, and the supply of the compressed gas to the air motor 12 can be stopped. . The valve ball 40 is preferably made of nylon. In this case, since the valve ball 40 has elasticity, it serves as a packing for the compressed gas outlet 37 and can enhance the sealing effect.
[0015]
Next, the trigger interlock mechanism 20 that moves the stopper 15 forward and backward in conjunction with the rotation of the trigger 18 and the trigger 18, clamps and releases the rotary shaft 11 with the clamp piece, and opens and closes the on-off valve 13 will be described.
As shown in FIG. 1, a laterally long slit 41 having a required width that is open at the top and bottom is formed on the lower surface side of the handle 10 that is directly below the on-off valve 13. The small diameter first through hole 21 is communicated.
[0016]
As shown in FIGS. 1, 5, and 6, a trigger 18 made of a thick plate is disposed in the horizontally long slit 41 so as to be rotatable around the pivot 19 in the front-rear direction (X direction). The tip of the trigger 18 is formed so as to be able to protrude and retract from the horizontally long slit 41 by the rotation operation of the trigger 18. One end of the crank link 43 is pivotally connected to the tip of the trigger 18 by a pivot 44, and the other end of the crank link 43 is pivotally connected to a middle part of the stopper 15 by a pivot 45. The stopper 15 is also formed with a horizontally long slit 46a having a lower surface opening, and the other end of the crank link 43 is inserted into the horizontally long slit 46a through the lower surface opening of the horizontally long slit 46a and then pivotally supported by the pivot 45. Become. With this configuration, the rotation operation of the trigger 18 can be easily converted into the advance / retreat operation of the stopper 15 via the crank link 43.
[0017]
As shown in FIGS. 1, 5, and 6, when the automatically / manually switchable wrench A is in a manual operation state, the upper surface of the trigger 18 has a first cam surface substantially parallel to the axis of the handle 10. 47 and a second cam surface 49 communicating with the first cam surface 47 via a corner 48 perpendicular to the first cam surface 47 is formed. In FIG. 1, one end of a valve stem 50 having an axis in a direction (E direction) orthogonal to the axis of the handle 10 is placed in contact with the first cam surface 47. The other end is disposed in a valve rod guide hole 51 formed in the handle 10 and the valve casing 31 so as to advance and retract toward the valve chamber 32 of the on-off valve 13. With this configuration, the first cam surface 47 and the second cam surface 49 are inclined by the rotation operation of the trigger 18, and the tip of the valve rod 50 is positioned between the first cam surface 47 and the second cam surface 49. Can be moved along the trajectory F, and the valve rod 50 can be easily advanced and retracted by this movement.
[0018]
(Activation of automatic / manual switchable wrench A)
Next, the fastening operation of the bolt B by a wrench A capable of switching the above-described configuration automatically and manually will be described.
[0019]
(Automatic operation)
For example, when a large number of bolts, nuts, screws, and the like are tightened in a production line of machinery or the like, if it is manually performed, it takes time and it is difficult to keep the tightening amount constant. In such a case, if the automatic / manual switchable wrench A is used as an automatic wrench, the working efficiency is good and the tightening can be performed under a constant torque management.
[0020]
First, in order to tighten the bolt B with a predetermined torque, the primary supply pressure of the compressed gas is set to a predetermined pressure by the pressure reducing valve 36. As shown in FIG. 1, the primary supply pressure can be measured while looking at the pressure gauge 34. That is, torque adjustment can be performed more accurately and easily than an impact wrench, and torque management is facilitated.
[0021]
As shown in FIG. 1, the attachment 14 that matches the bolt B is attached to the tip of the rotating shaft 11 of the air motor 12. Note that the attachment 14 can be appropriately replaced depending on the type (bolt, nut, screw, etc.) and size of the member to be tightened. Note that the rotational torque of the air motor 12 is a static torque, and does not generate high-speed vibration like an impact wrench during rotation. Therefore, it is not necessary to insert a pin or the like into the attachment 14 and fix it to the rotating shaft 11. Therefore, the attachment 14 can be easily and quickly attached to and removed from the rotating shaft 11.
[0022]
Next, when the trigger 18 is pulled and rotated rearward, the stopper 15 is retracted against the urging force of the spring 29 by the crank link 43 constituting the trigger interlocking mechanism 20, and the rotating shaft 11 is fixed together with the backward movement of the stopper 15. The small-diameter protrusion 16 that is the clamp piece that has been removed is extracted from the protrusion insertion hole 17, and the rotary shaft 11 becomes rotatable. Further, the valve rod 50 is moved into the first cam by the cooperation of the first cam surface 47, the second cam surface 49 and the valve rod 50 constituting the trigger interlocking mechanism 20 simultaneously with the rearward rotation of the trigger 18 described above. After moving from the surface 47 toward the second cam surface 49, it is held on the second cam surface 49. By this movement, the valve rod 50 moves into the valve chamber 32 of the on-off valve 13 against the urging force of the spring 40a, pushes up the valve ball 40, opens the compressed gas outlet 37, and holds the open position. . As a result, a compressed gas having a predetermined pressure is supplied to the switching valve 52 and then supplied to the air motor 12 to rotate the rotating shaft 11 and the attachment 14 integrally. At this time, since the rotation direction of the rotary shaft 11 is determined in advance by the switching operation of the switching lever 53 of the switching valve 52, the bolt B engaged with the attachment 14 can be rotated in any rotation direction, and automatically In addition, the bolt B can be tightened or loosened. At this time, since the air motor 12 is a static torque motor, the repeated impact load does not act like an impact wrench, and the bolt B can be prevented from being damaged by a slight torque adjustment error.
[0023]
In addition, since the air motor 12 automatically stops at the same time as the tightening is completed, the working time can be shortened, and wasteful air consumption is not required.
Further, as shown in FIG. 1, in the present embodiment, the wrench A that can be switched automatically and manually is formed in an L shape by the handle 10 and the air motor 12, so that the handle 10 is held on the grip surface 24 by hand. Therefore, when tightening automatically, the tightening torque can be checked on the spot from the reaction force felt by the hand. Even during manual operation, the tightening torque can be checked from the reaction force described above.
[0024]
(manual operation)
When the handle 10 in the above-described automatic operation state, that is, in the state pulled sufficiently backward is released, that is, when the handle 10 is rotated forward, the stopper 15 is moved forward by the biasing force of the spring 29 in the compressed state. The small-diameter projection 16 continuously extending toward the front portion thereof is fitted into any one of a plurality of projection insertion holes 17 provided on the outer peripheral surface of the rotating shaft 11 at intervals in the circumferential direction. The rotation of the rotating shaft 11 is restricted.
[0025]
On the other hand, when the handle 10 is rotated forward, the valve rod 50 is simultaneously driven by the cooperation of the first cam surface 47, the second cam surface 49 and the valve rod 50 constituting the trigger interlocking mechanism 20 and the biasing force of the spring 40a. Moves from the second cam surface 49 to the first cam surface 47, the valve stem 50 moves backward from the valve chamber 32, the valve ball 40 is pushed down by the backward movement of the valve rod 50, and the compressed gas outlet 37 is closed. To. As a result, the supply of the compressed gas having a predetermined pressure to the air motor 12 is stopped, the rotation of the rotating shaft 11 is stopped, and the small-diameter protrusion 16 connected to the tip of the stopper 15 is not damaged.
[0026]
At this time, the positions of the protrusion insertion holes 17 provided in the rotating shaft 11 and the small-diameter protrusions 16 of the stopper 15 may be somewhat shifted. However, as shown in FIG. 4, six protrusion insertion holes 17 are provided, and when the rotation of the rotating shaft 11 stops due to the relationship between the outer diameter of the rotating shaft 11 and the outer diameter of the small-diameter protrusion 16, the stopper 15. Since any one of the projection insertion holes 17 always exists in the vicinity of the small-diameter projection 16, the small-diameter projection 16 of the stopper 15 is always one of the projections by simply rotating the rotating shaft 11 with a finger while the attachment 14 is attached. It will be inserted in the insertion hole 17, and the rotating shaft 11 can be fixed.
[0027]
Thus, after the automatic / manual switchable wrench A is switched from the automatic operation state to the manual operation state, the automatic / manual switchable wrench A can be used as a manual wrench. That is, by engaging the attachment 14 with the bolt B and rotating the entire wrench A that can be switched automatically and manually, it can be used as a normal wrench. That is, since it is possible to switch from automatic to manual by simply releasing the trigger 18 , it is possible to easily tighten bolts, nuts, screws, etc., switch to manual, and perform additional tightening.
[0028]
Moreover, the workability can be improved by first loosening bolts B which are rusted and difficult to loosen first manually and then tighten automatically later.
[0029]
As described above, the present invention has been described with reference to the automatic / manual switchable wrench according to the illustrated embodiment. However, the automatic / manual switchable wrench A may be configured as follows.
[0030]
As shown in FIG. 7, when the automatic / manual switchable wrench A is not used, the trigger 18 is removed from the handle 10, and the crank link 43 is housed in a horizontally long slit 46a by a pivot 45 and a connecting shaft 54 in a fixed state. be able to.
[0031]
The wrench A that can be automatically and manually switched can be rotated in the same direction as the rotation direction of the rotary shaft 11 while pulling the trigger 18 with a finger.
[0032]
It is also possible to add a function of attaching a torque detection sensor to the air motor 12 and automatically stopping the air motor 12 according to the sensor output.
[0033]
The compressed gas is not limited to compressed air, and compressed nitrogen gas can also be used.
[0034]
【The invention's effect】
In the automatic / manual switchable wrench according to claim 1, a handle comprising a shaft rod,
An air motor attached to the tip of the handle and having a rotation axis in a direction perpendicular to the axis of the handle;
An attachment detachably attached to the tip of the rotating shaft;
A stopper provided with a clamp piece disposed in the handle so as to be movable back and forth in the axial direction and capable of clamping the rotary shaft at the front portion;
An on-off valve provided with a pressure reducing valve for setting the primary supply pressure of the compressed gas supplied to the handle and attached to the handle to a predetermined pressure, and a pressure gauge for displaying the supply pressure, and for controlling supply / stop of the compressed gas When,
A trigger whose base is rotatably attached to the outer peripheral surface of the handle about the pivot axis in the front-rear direction;
The stopper is advanced and retracted in conjunction with the rotation of the trigger, and is removably inserted into a protrusion insertion hole provided at a circumferential interval on the outer peripheral surface of the rotary shaft by the clamp piece ,
A trigger interlocking mechanism for performing clamping and releasing thereof and opening and closing the on-off valve;
Comprising
By rotating the trigger in the pulling direction,
The clamp of the rotary shaft by the clamp piece is released, the open / close valve is opened, compressed gas is supplied to the air motor, the attachment can be rotated together with the rotary shaft, and the trigger rotates in the return direction. By
The clamp piece clamps the rotating shaft and closes the open / close valve to stop the supply of compressed gas to the air motor, thereby stopping the rotation of the attachment.
[0035]
In this way, automatic / manual operation switching, torque management, attachment replacement, etc. can be easily performed by the trigger interlock mechanism, so that bolts, nuts, screws, etc. can be tightened or loosened without damage. The production efficiency of machinery production line can be improved.
[0036]
In the automatic / manual switchable wrench according to claim 2, a spring is disposed at the rear portion of the handle, and the clamp piece of the stopper is biased toward the rotating shaft by the biasing force of the spring. . Therefore, the clamp piece of the stopper can automatically stop the rotation by fixing the rotating shaft only by releasing the finger from the trigger that is pulled by the finger, and the wrench that can be switched automatically and manually is surely automatically You can switch from operation to manual operation.
[0037]
In the automatic / manual switchable wrench according to claim 3, the trigger interlocking mechanism pivotally supports one end of the crank link by a pivot at the tip of the trigger and pivotally supports the other end of the crank link by the pivot. The stopper is advanced and retracted through the crank link by the rotation of the trigger, the cam surface is provided on the peripheral surface of the trigger, and one end of the valve rod that can reciprocate in the direction perpendicular to the axis of the handle is brought into contact with the cam surface. The other end of the valve rod is in contact with a valve body that opens and closes the valve seat of the on-off valve, and the on-off valve can be opened and closed by moving the valve body in the axial direction by the rotation of the trigger.
[0038]
Therefore, by rotating the trigger, the rotation shaft can be fixed and released by moving the stopper back and forth, and the compressed gas can be supplied to the air motor and stopped by opening and closing the on-off valve. By doing so, a wrench capable of automatic / manual switching can be made compact and can be manufactured at low cost.
[Brief description of the drawings]
FIG. 1 is a front view of a wrench capable of automatic / manual switching according to an embodiment of the present invention when a handle is held in a horizontal state and bolts, nuts, screws, etc. are tightened or loosened.
FIG. 2 is a plan view taken along the line II in FIG.
FIG. 3 is a side view taken along the line II-II in FIG. 1;
FIG. 4 is a transverse sectional view of a rotation shaft of an air motor.
FIG. 5 is a perspective view of a main part of a trigger interlocking mechanism.
FIG. 6 is a perspective view of a main part of a trigger interlocking mechanism.
FIG. 7 is an explanatory diagram of a storage state when the crank link of the trigger interlocking mechanism is transported.
[Explanation of symbols]
A: Automatic / manual switchable wrench B: Bolt 10: Handle 11: Rotating shaft 12: Air motor 13: On-off valve 14: Attachment 15: Stopper 16: Small-diameter projection 17: Projection insertion hole 18: Trigger 19: Axis 21, 22 , 23: Through hole 24: Grip surface 25: Upper bearing 26: Lower bearing 27: Engagement hole 28: Stopper advancement restriction plate 29: Spring 29a: Spring guide 30: Stopper receiving plug 31: Valve casing 32: Valve chamber 33 : Compressed gas supply port 34: pressure gauge 35: compressed gas supply main pipe 36: pressure reducing valve 37: compressed gas outlet 38: compressed gas supply pipe 39: compressed gas inlet 40: valve ball 40 a: spring 41: horizontally long slit 43 : Crank links 44, 45: Axis 46a: Horizontal slit 47: First cam surface 48: Corner 9: second cam face 50: valve stem 51: the valve rod guide hole 52: switching valve 53: switching lever 54: connecting shaft

Claims (3)

A handle consisting of a shaft rod,
An air motor attached to the tip of the handle and having a rotation axis in a direction perpendicular to the axis of the handle;
An attachment detachably attached to the tip of the rotating shaft;
A stopper provided with a clamp piece disposed in the handle so as to be movable back and forth in the axial direction and capable of clamping the rotary shaft at the front portion;
An on-off valve provided with a pressure reducing valve for setting the primary supply pressure of the compressed gas supplied to the handle and attached to the handle to a predetermined pressure, and a pressure gauge for displaying the supply pressure, and for controlling supply / stop of the compressed gas When,
A trigger whose base is rotatably attached to the outer peripheral surface of the handle about the pivot axis in the front-rear direction;
The stopper is advanced and retracted in conjunction with the rotation of the trigger, and is removably inserted into a protrusion insertion hole provided at a circumferential interval on the outer peripheral surface of the rotary shaft by the clamp piece ,
A trigger interlocking mechanism for performing clamping and releasing thereof and opening and closing the on-off valve;
Comprising
By rotating the trigger in the pulling direction,
The clamp of the rotary shaft by the clamp piece is released, the open / close valve is opened, compressed gas is supplied to the air motor, the attachment can be rotated together with the rotary shaft, and the trigger rotates in the return direction. By
An automatic / manual wrench capable of clamping the rotary shaft by the clamp piece and closing the on-off valve to stop the supply of compressed gas to the air motor to stop the rotation of the attachment. 2. The automatic mechanism according to claim 1, wherein a spring is disposed at a rear portion of the handle, and the clamp piece of the stopper is biased toward the rotating shaft by a biasing force of the spring.・ Manually switchable wrench. The trigger interlocking mechanism pivotally supports one end of a crank link by a pivot on the tip of the trigger and pivotally supports the other end of the crank link on the stopper by a pivot, and rotates the trigger via the crank link. The stopper is advanced and retracted, a cam surface is provided on the peripheral surface of the trigger, and one end of a valve rod capable of reciprocating in the direction perpendicular to the axis of the handle is brought into contact with the cam surface. A valve body that opens and closes a valve seat of the on-off valve is configured to be able to open and close the on-off valve by moving the valve body in an axial direction by rotation of the trigger. Wrench that can be switched automatically and manually according to 1 or 2.

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