JP2002254339A - Reverse device for air impact wrench - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reverse device that can switch normal and reverse rotation via an operation by a single finger of a hand holding a grip of an air impact wrench. SOLUTION: In the air impact wrench, where power supplied by an air motor built in an impact wrench body 1 is transmitted to an anvil 6 via an impact mechanism, the reverse device R is disposed in a lower part of the impact wrench body 1 substantially parallel to an output shaft of the air motor, and is designed to feed the air motor with air supplied from an air supply passage 8 formed in the grip 7 integrally secured to the lower part of the impact wrench body 1. The reverse device R comprises a cylindrical reverse bush 11 inserted in the lower part of the impact wrench body 1, and a knock type reverse valve 5 with a cam mechanism capable of positioning and sliding in the reverse bush 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a reverse device for an air impact wrench.

[0002]

Conventional air impact wrench, reverse device R ₅ of the rod-like between the trigger 59 and an impact wrench body 51 as shown in FIG. 5, are disposed parallel to the output shaft of the air motor. Reverse device R ₅ is provided with a reverse bush which is inserted into the main body 51, slidably fitted interpolated reverse valve within this reverse bushing.

[0003] Then, in the above conventional air impact wrench, the rotation of the air motor from the right rotation (clockwise) to switch to the left rotation (counterclockwise rotation), the end cap 53 side of the reverse unit R ₅ in FIG. 5 the tip, when pressed by the index finger of the hand towards or she grips the grip 57, is projected to the tip of the anvil 56 side of the reverse unit R _5, to switch the right rotation from left rotation Conversely, reverse apparatus R ₅ that is allowed to protrude Press the tip on the side of the anvil 56 with your thumb,
The tip of the reverse device on the end cap 53 side is protruded.

[0004]

However, the above-mentioned conventional reverse device needs to be operated with two fingers, the index finger and the thumb, holding the grip as described above. When the work area is small as in the case of car maintenance / repair or the like, and when it is desired to frequently switch the forward / reverse rotation of the air impact wrench, the work efficiency often decreases.

The present invention has been made in view of the above-mentioned problems of the prior art,
An object of the present invention is to provide a reverse device capable of switching between forward and reverse rotation by operating one finger of a hand holding a grip of an air impact wrench.

[0006]

For this purpose, in the reverse device of the air impact wrench of the present invention, the power supplied from the air motor incorporated in the impact wrench body is transmitted to the anvil via the impact mechanism. In the air impact wrench, a lower portion of the impact wrench main body is disposed substantially parallel to an output shaft of the air motor, and a supply passage provided in a grip integrally fixed to the lower portion of the impact wrench main body. A reverse device for distributing supplied air to an air motor, wherein the reverse device has a cylindrical reverse bush inserted into a lower portion of the impact wrench main body, and is capable of positioning and sliding inside the reverse bush. A knock reverse valve having a cam mechanism.

In another reverse device of the present invention, the reverse bush further includes a spring support for closing one open end, an air inlet formed on a side surface and communicating with the air supply passage, and a reverse side bush formed on the side surface. And two air outlets communicating with the air motor, two exhaust ports formed on the side surface and communicating with an exhaust passage provided in the grip, a cam bottom formed on the inner surface, and a plurality of grooves, The cam mechanism of the knock reverse valve has a push spring attached to the spring support and a plurality of protrusions slidably fitted in the groove, and is rotatably pressed by the push spring. A spin ring and a convex portion which is slidably fitted in the groove portion are formed, and a cylinder at an end on the anvil side of the knock reverse valve. And Come roll rotatably pressed in part, the knock-reverse valve is characterized in that it comprises a spring for biasing away from the end cap of the impact wrench body.

[0008] In still another reverse device of the present invention, a regulator lever is fitted to the end cap side of the knock reverse valve, and a switching portion formed on the knock reverse valve corresponding to the air inlet. Has a notch.

[0009] In still another reverse device of the present invention, the reverse bush is further formed with a spring support for closing one open end, an air inlet formed on a side surface and communicating with the air supply passage, and a side surface formed on the side surface. Two air outlets communicating with the air motor, two exhaust ports formed in side surfaces and communicating with an exhaust passage provided in the grip, a cam bottom formed on the inner surface, and a plurality of grooves, The cam mechanism of the knock reverse valve has a push spring attached to the spring support, a plurality of protrusions slidably fitted in the grooves, and a first ball interposed between the push springs. A spin ring that is rotatably pressed and a protrusion that is slidably fitted in the groove are formed, and the knock reverse valve is A cam roll rotatably mounted in a cylindrical recess at an end on the side of the anvil; and a cam roll disposed in a circular through hole formed in a cylindrical side surface of the cam roll and fitted in an annular groove formed in the spin ring. A second ball slidably attached to the bottom. In this case, the cam roll is
It is preferable to be rotatably attached to the cylindrical recess by a rotary cam roll stopper formed on the knock reverse valve side.

[0010]

An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of an air impact wrench according to an embodiment of the present invention, FIG. 2 is an exploded perspective view of a reverse device of the air impact wrench of FIG. 1, and FIG. 3 switches the reverse device to a clockwise (clockwise) direction. FIG. 4 is a cross-sectional view for explaining the operation in the state, and FIG. 4 is a cross-sectional view for explaining the operation in the state in which the reverse device is switched to the left rotation (counterclockwise rotation).

In FIG. 1, reference numeral 1 denotes an impact wrench main body, and an air motor (not shown) is built in a motor housing thereof. The rotational power supplied from the output shaft of the air motor is transmitted to the anvil 6 via a striking mechanism called an impact clutch. Also,
An end cap 3 is fixed to a rear end of the impact wrench main body 1 by a bolt.

A grip 7 is integrally fixed to a lower portion of the impact wrench main body 1. An air supply passage 8 is provided in the grip 7, and the lower end thereof is connected to an air hose (not shown). In the lower part of the impact wrench main body 1, near the place where the grip 7 is fixed, a reverse device R is provided substantially parallel to the output shaft of the air motor.

In the grip 7, together with the air supply passage 8,
Exhaust passages (not shown) are also provided, and these passages communicate with the air motor via the reverse device R. Also, 9
Is a trigger rotatably attached to the upper front end of the grip 7. By opening an on-off valve (not shown) connected to the trigger 9 and disposed in the air supply passage 8, air is supplied to the air motor.

As shown in FIG. 2, the reverse device R
Includes a cylindrical reverse bush 11 inserted into a lower portion of the impact wrench main body 1 and a knock reverse valve 5 having a cam mechanism capable of positioning and sliding inside the reverse bush 11.

One open end of the reverse bush 11 is closed by a spring support 12. A side surface of the reverse bush 11 is provided with an air inlet 11 communicating with the air supply passage 8.
a, two air outlets 11b and 11 communicating with the air motor
c, two exhaust ports 11d and 11e communicating with the exhaust passage provided in the grip 7 are formed.

In the reverse device according to the embodiment shown in FIG. 2, the air inlet 11a is formed in the middle bush of the reverse bush 11 and communicates with the air supply passage 8 provided in the grip 7. The air outlet 11b is located on the front side of FIG.
a is formed closer to the end cap 3 than a. Blow port 11c
Is formed on the other side of FIG. 2 and on the side of the anvil 6 from the air inlet 11a. The exhaust port 11d is formed above the reverse bush 11 and closer to the end cap 3 than the blow port 11b, and the exhaust port 11e is formed above the reverse bush 11 and closer to the anvil 6 than the blow port 11c. A cam bottom 11f and a plurality of grooves 11g are formed on the inner surface of the reverse bush 11 and on the side of the anvil 6 from the exhaust port 11e.

The cam mechanism of the knock reverse valve 5 of the reverse device in the embodiment of FIG. 2 includes a push spring 13 attached to the spring support 12.
And a plurality of protrusions 14a slidably fitted in the groove 11g, and a spin ring 14 rotatably pressed by the push spring 13 and slidably fitted in the groove 11g. A cam roll 15 formed with a convex portion 15b to be combined and rotatably pressed against an anvil side end portion 5a of the knock reverse valve 5;
A spring 16 for urging the knock reverse valve 5 away from the end cap 3;

The cam mechanism of the knock reverse valve 5 of the reverse device in the embodiment of FIG. 6 includes a push spring 13 attached to the spring support 12 and a plurality of slidably fitted grooves 11g. A spin ring 13 formed with a convex portion 14a and rotatably pressed by a push spring 13 with a first ball 19 made of steel interposed therebetween;
g is formed on the anvil side end 5 of the knock reverse valve 5.
cam roll 1 rotatably mounted in cylindrical recess
5 is disposed in a circular through hole 15c formed in a cylindrical side surface of the cam roll 15, is fitted in an annular groove 14c formed in the spin ring 14, and is slidably attached to the cam bottom 11f. Steel made second
And a ball 18.

In the reverse device according to the embodiment shown in FIG. 6, the cam roll 15 is rotatably mounted in the cylindrical recess by a rotary cam roll stopper 15a formed on the knock reverse 5 side. The spring 16 is not necessary because the spin ring 15 and the spin ring 14 are connected.

Further, a regulator lever 17 is attached to the end cap 3 side of the knock reverse valve 5. A key 17b is formed in the fitting hole 17a of the regulator lever 17, and a key groove 5b is formed in the end face of the knock reverse valve 5 on the end cap side, and these are fitted.

As shown in FIGS. 2 and 3, the knock reverse valve 5 has a portion having a different diameter from the anvil side to the end cap side. That is,
The anvil-side end 5a has an outer diameter substantially the same as the inner diameter of the reverse bush 11, and the first small-diameter portion 5e connected to the anvil-side end 5a has an outer diameter that is approximately half the inner diameter of the reverse bush 11. The switching portion 5c connected to the first small diameter portion 5e also has an outer diameter substantially the same as the inner diameter of the reverse bush 11. The switching portion 5c has a notch 5c _1. Switching unit 5
The second small diameter portion 5d connected to c has an outer diameter substantially half the inner diameter of the reverse bush 11, and the large diameter portion 5f connected to the second small diameter portion 5d has an outer diameter substantially equal to the inner diameter of the reverse bush 11. are doing. The knock portion 5g connected to the large diameter portion 5f is slightly smaller than the outer diameter of the large diameter portion 5f, and the spring 16 is fitted therein. 6, the configuration of the knock reverse valve 5 is substantially the same as that of FIG. 2 except that the spring 16 is omitted.

As described above, in the reverse device R, the bush spring 13 is inserted into the cylindrical reverse bush 11 and the spring support 12, and is held by the spin ring 14.
While rotating the spin ring 14 with the cam roll 15,
Since the knock reverse valve 5 is positioned at the groove 11g of the reverse bush 11, the cam 14 is pressed by the anvil-side end face 5a of the knock reverse valve 5 so that the convex portion 14a of the spin ring 14 becomes When the air impact wrench is switched to the counterclockwise direction when it enters the groove portions 11g, pressing again causes the convex portion 14a of the spin ring 14 to rotate the reverse bush 1.
The air impact wrench can be switched in the clockwise direction by disengaging from the groove 11g and riding on the cam bottom 11f. At this time, the knock reverse valve 5 is pressed by the spring 16 so as not to return to the end cap 3 side.

The flow of air in the reverse device R will be described with reference to FIGS. FIG. 3 is a cross-sectional view illustrating the operation in a state where the reverse device is switched to the right rotation direction. When the knock portion 5g of the knock reverse valve 5 is pressed, the switching portion 5c moves from the air inlet 11a to the anvil side. Since the anvil side end 5a moves from the exhaust port 11e to the anvil side and the large diameter portion 5f closes the exhaust port 11d, air enters the air inlet 11a from the air inlet 11a of the reverse bush 11 to the air outlet 11b to the air motor. Air is fed in and the air motor rotates clockwise. Then, the residual exhaust gas passes through the blowing port 11c and is exhausted from the exhaust port 11e to the exhaust passage.

FIG. 4 is a cross-sectional view for explaining the operation in a state where the reverse device is switched to the left rotation direction. When the knock portion 5g of the knock reverse valve 5 is pressed again, the knock device 5 protrudes from the end cap 3. The switching portion 5c moves from the air inlet 11a to the end cap side, the anvil side end 5a and the cam roll 15 fixed thereto close the air outlet 11e, and the large diameter portion 5f ends from the air outlet 11d. Since the air moves to the cap side, air enters the air inlet 11c from the air inlet 11a, the air is sent to the air motor, and the air motor rotates left. And
The residual exhaust passes through the air outlet 11b and is exhausted from the exhaust outlet 11d to the exhaust passage. The air flow of the reverse device of FIG. 6 shown in FIGS. 7 and 8 is also substantially the same as the operation of FIGS. 3 and 4.

[0025]

As described above in detail, according to the reverse device of the present invention, the knock reverse valve provided with the cam mechanism can be positioned and slidable in the cylindrical reverse bush. The operator can switch between clockwise rotation and counterclockwise rotation by simply double-knocking the knock reverse valve with one finger of the hand holding the grip.

Also, since the regulator lever is fitted on the end cap side of the knock reverse valve,
The notch can be rotated by twisting the regulator lever to the left and right, and the flow rate of the air flowing from the air inlet can be adjusted.

Further, by adding the rotary cam roll stopper and the first ball, the knock reverse valve is connected to the cam roll and the spin ring. Therefore, when the reverse device is switched from the left rotation to the right rotation, air is supplied. It is in a fixed state so that it enters the air outlet from the mouth. In addition, the rotation of the spin ring is further smoothed by inserting the second ball, so that the spin ring can be freely rotated.

[Brief description of the drawings]

FIG. 1 is a perspective view of an air impact wrench according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of the reverse device of the air impact wrench of FIG. 1;

FIG. 3 is a cross-sectional view illustrating an operation in a state in which the reverse device is switched to the clockwise (clockwise) direction.

FIG. 4 is a cross-sectional view illustrating an operation in a state where the reverse device is switched to the left rotation (counterclockwise rotation) direction.

FIG. 5 is a front view of a conventional air impact wrench.

FIG. 6 is an exploded perspective view of a reverse device of an air impact wrench according to another embodiment of the present invention.

FIG. 7 is a cross-sectional view illustrating an operation in a state where the reverse device of FIG. 6 is switched to the clockwise (clockwise) direction.

FIG. 8 is a cross-sectional view illustrating an operation in a state where the reverse device of FIG. 6 is switched to the left rotation (counterclockwise rotation) direction.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Impact wrench main body 3 End cap 4 Regulator lever 5 Knock reverse valve 6 Anvil 7 Grip 8 Air supply passage 11 Reverse bush R Reverse device

Claims (5)

[Claims] 1. An air impact wrench in which power supplied from an air motor incorporated in an impact wrench body is transmitted to an anvil via a striking mechanism. A reverse device for distributing air supplied from an air supply passage provided in a grip integrally fixed to a lower portion of the impact wrench body to an air motor, the reverse device being disposed in parallel with the impact wrench body, A reverse device for an air impact wrench, comprising: a cylindrical reverse bush inserted into a lower portion of the impact wrench main body; and a knock reverse valve including a cam mechanism capable of positioning and sliding in the reverse bush. 2. The reverse bush has a spring support for closing one open end, an air inlet formed on a side surface and communicating with the air supply passage, and two air outlets formed on a side surface and communicating with the air motor. And two exhaust ports formed on a side surface and communicating with an exhaust passage provided in the grip; a cam bottom and a plurality of grooves formed on an inner surface; a cam mechanism of the knock reverse valve, A push spring attached to a spring support; a plurality of protrusions slidably fitted in the groove; and a spin ring pressed rotatably on the push spring; slidable in the groove. A cam roll formed with a projection fitted therein, and rotatably pressed into a cylindrical recess at the anvil-side end of the knock reverse valve, Serial knock reverse valve is a reverse apparatus for air impact wrench according to claim 1, characterized in that it comprises a spring for biasing away from the end cap of the impact wrench body. 3. The knock reverse valve according to claim 2, wherein a regulator lever is fitted on the end cap side of the knock reverse valve, and a cut-out portion is formed in a switching portion formed in the knock reverse valve corresponding to the air inlet. Reverse device for air impact wrench. 4. The reverse bush has a spring support for closing one open end, an air inlet formed on a side surface and communicating with the air supply passage, and two air outlets formed on a side surface and communicating with the air motor. And two exhaust ports formed on a side surface and communicating with an exhaust passage provided in the grip; a cam bottom and a plurality of grooves formed on an inner surface; a cam mechanism of the knock reverse valve, A push spring attached to a spring support, a plurality of protrusions slidably fitted in the groove portion, and a spin ring pressed rotatably with the first spring interposed between the push springs; A convex portion slidably fitted in the groove portion is formed, and the knock reverse valve is rotatably attached to a cylindrical concave portion at an end on the anvil side. And a second ball disposed in a circular through hole formed in a cylindrical side surface of the cam roll, fitted in an annular groove formed in the spin ring, and slidably attached to the cam bottom. The reverse device for an air impact wrench according to claim 1, further comprising: 5. The reverse device for an air impact wrench according to claim 4, wherein the cam roll is rotatably attached to the cylindrical recess by a rotary cam roll stopper formed on a knock reverse valve side.