JPH03190678A - Air tool - Google Patents

Abstract

PURPOSE:To increase operability by relating a throttle provided on the throttle rod of a throttle mechanism to the rotating reverse bush of a reverse mechanism. CONSTITUTION:A throttle 20 provided on the throttle rod 21 of a throttle mechanism 7 is provided in relation to the rotating reverse bush 24 of a reverse mechanism 8. In order to make an air motor 16 rotate to the right viewing from the left part, a throttle 20 is turned to the right direction and a rotating reverse bush 24 is set with its turning desired posture. Then, the air fed from an annular groove 37 is fed to the right rotation side feed pass 18 through a passage 47 to make an air motor 16 rotate to the right. At this time, the left rotation side feed pass 17 becomes an exhaust passage together with an exhaust passage 19, the air is fed to an exhaust passage 10 via a passage 46, an annular groove 38 and a passage 48 and exhausted through a silencer 12.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The invention of this application relates to an air tool such as an impulse wrench, an impact wrench, a screwdriver, a tapper, etc., which has a throttle mechanism and a reverse mechanism.

[Prior Art] Conventionally, this type of air tool has, for example, the one shown in Fig. 5(a).
As shown in (b), a throttle mechanism (7) and a reverse mechanism (8) are separately provided side by side on the handle part (3) of the air tool, and a throttle lever (50) is attached to the front part of each. ) and a reverse lever (51) to operate the throttle mechanism (7) and reverse mechanism (8).

In addition, for this type of air tool, for example, as shown in Fig. 6(a),
As shown in (b), the throttle mechanism (7) and the reverse i mechanism (8) are integrated into the handle part (3) of the air tool, and the throttle lever ( 50), and reverse mechanism (8)
There is a mechanism in which the throttle mechanism (7) and reverse mechanism (8) are operated by being attached to the side of the engine or by operating a base lever (51).

[Problems to be Solved by the Invention] However, in the conventional air tool described above, the throttle mechanism (7) and the reverse mechanism (8) are
3), in which the handle portions (3) are provided separately and arranged side by side, has the problem that the handle portion (3) becomes bulky. Also, if you use a large number of air tools (such as on an automobile assembly line), an air hose is placed from above, the air tools are hung upside down, and a balancer is attached to the air tool. There are many
The operator holds the air tool suspended upside down so that the throttle lever (50) is in front of the handle part (3).
and operates the throttle lever (50) with his middle finger. At this time, there was a problem in that the reverse lever (51) came into contact with the ring finger, etc., making it difficult to operate.

Furthermore, among the conventional air tools mentioned above, even if the throttle mechanism (7) and the reverse mechanism (8) are integrally provided in the handle part (3) of the air tool, it is also possible to Throttle lever (50)
, and those that operate the reverse lever (51) attached to the side of the reverse m structure c8), had the problem that it was difficult to operate due to the positional relationship between the throttle lever (50) and the reverse lever (51). .

Therefore, the air tool of the invention of this application was made for the purpose of solving the problems that the conventional air tools have.

[Means to solve the problem]

Therefore, in the invention according to claim 1 of this application, the throttle (20) provided on the throttle lever (21) of the throttle mechanism (7) is connected to the rotating reverse bush (24) of the reverse mechanism (8). It is assumed that

Furthermore, the invention according to claim 2 of this application includes a throttle mechanism (7) in which a throttle lever (21) provided with a throttle (20) is slidably inserted into a throttle bush (22); A rotating reverse bushing (24) having a pin (23) that engages with the throttle (20) and into which the throttle bushing (22) is slidably inserted is slid onto a fixed reverse bushing (25). It has a reverse mechanism (8) which can be freely inserted.

[Function] In the invention recited in claim 1 of this application, since the above means is provided, the throttle mechanism (7) and the reverse mechanism (8) can be operated by operating only the throttle (20).

Furthermore, in the invention according to claim 2 of this application, since the above means is provided, by pressing the throttle (20),
In addition to operating the throttle mechanism (7), the rotation of the throttle (20) allows the reverse mechanism (8) to be operated.

〔Example〕

Hereinafter, the configuration of the air tool of the invention of this application will be explained based on the drawings shown as examples.

This embodiment shows an air tool with a two-stage throttle, and the main body (1) is composed of a hammer case part (2), a handle part (3), and a motor case part (4).

The hammer case portion (2) is equipped with a striking mechanism (not shown) and the like. A chuck (6) for the bit (5) is provided in front of the hammer case portion (2).

A throttle mechanism (7) and a reverse mechanism (8) are integrally provided at the upper part of the handle portion (3). The handle portion (3) also includes an inlet passageway (9) and a discharge passageway (1
0) is provided, and furthermore, at the lower end of the handle portion (3),
An air supply port (11) is provided on the intake passage (9) side, and a silencer (12) is provided on the discharge passage (10) side.

The motor case portion (4) is equipped with an air motor (16) having a vane (14), a rotor (15), etc. within a cylinder (J3). The motor case part (4) includes a left rotation side air supply passage (17) and a right rotation side air supply passage (1) that ventilate into the intake passage (9) of the handle part (3).
8) and an exhaust passage (19) that ventilates the exhaust passage (10) of the handle portion (3).

The throttle mechanism (7) connects the throttle rod (21) provided with the throttle (20) to the throttle button (
22). Further, the reverse mechanism (8) includes a pin (2o) that engages with the throttle (2o).
3) and the throttle valve (22).
) is slidably inserted into the rotating reverse bushing (24)
It is slidably inserted into the fixed reverse bush (25). Furthermore, the throttle (of the throttle mechanism (7))
20) has a knob shape with a low left (2
0a).

A ventilation groove (
26) and a throttle button (22).
A ventilation groove (27) is formed on the outer periphery of the approximately central part, and these air grooves (26) (27) are connected to the throttle button (2).
2) through a through hole (28). Further, an air reservoir chamber (29) is provided between the front end surface of the throttle bushing (22) and the front inner surface of the rotating reverse bushing (24). (29
), a locking body (3o) such as an E-ring is provided protruding from the throttle rod (21).

In addition, there are air pockets (not shown) on the sliding surfaces of the throttle rod (21) and the throttle bushing (22), and on the sliding surfaces of the throttle bushing (22) and the rotating reverse bushing (24). (29) A gap is provided for the introduction of henoair. Note that this gap may be set between the throttle rod (21) and the throttle bush (2) as necessary.
It may be present on either the sliding surface of 2) or the sliding surfaces of the throttle bushing (22) and the rotating reverse bushing (24).

A valve body (31) is provided at the rear end of the throttle rod (21).
) is provided, and this valve body (31) is provided with an O ring (
32) is attached to seal the air supply port (33) of the throttle bush (22). Furthermore, a valve body (34) is provided at the rear end of the throttle bush (22), and an O-ring (35) is also attached to this valve body (34), and a fixed reverse bush (25) is attached to the valve body (34). Air supply port (
36) is sealed.

In the rear road half of the rotating reverse bush (24), there is communication between the intake passage (9) and the left rotation side air supply passage (17);
Alternatively, an annular groove (37) is bored for switching the communication between the supply passage (9) and the clockwise rotation side air supply passage (18).

Further, the front and rear substantially lower half portions of the rotating reverse bush (24) communicate with the exhaust passage (10) and the exhaust passage (19), and the exhaust passage (10) and the left rotation side air supply passage communicate with each other. (
17), or an annular groove (38) for switching the communication between the exhaust passage (10) and the right rotation side air supply passage (18).
) is installed.

Further, a cut groove (39) is formed in the upper front end of the rotating reverse bush (24), and a cut groove (39) is formed in the upper front end of the fixed reverse bush (25) and this cut groove (39). 40
), insert the stopper pin (41) between the rotating reverse button (24) and the fixed reverse button (25).
I try not to let the karanuki fall. Further, a cut hole (42) is formed in the lower front end of the rotating reverse bush (24), and the ball (44) is inserted into the cut hole (42) under the force of the spring (43). By fitting the lower part into one of the two holes (45) (45) provided at the lower front end of the fixed reverse bush (25),
The rotating reverse bush (24) can be positioned.

On the rear road half of the fixed reverse bush (25), there is a left rotation side air supply passage (17) and a rotary reverse bush (25).
4) with the annular groove (38), or the left rotation side air supply passage (17) and the rotation reverse bush (24) with the annular groove (38).
7), and a passageway (46) for switching to communication with
) with the annular groove (37), or right rotation side air supply path (
18) and the annular groove (38) of the rotating reverse bush (24).
) is provided with a passageway (47) for switching to communication with the main body. Furthermore, the exhaust passage (19) and the annular groove (38) of the rotating reverse bush (24) are communicated with each other in the front and rear substantially lower half of the fixed reverse bush (25), and the exhaust passage ( 10) and the annular groove (38) of the rotating reverse bushing (24).

Next, the operating conditions of the throttle mechanism (7) and reverse mechanism (8) of the air tool of the invention of this application will be described.

In the state shown in Fig. 1, even if air is supplied from the air supply port (11), the air supply port (33) of the throttle bush (22) is sealed by the O-ring (32), so the air is not supplied. The air is not sent from the supply passageway (9) to the left rotation side air supply passage (I7) or the right rotation side air supply passage (18). Therefore, as a - stage operation, throttle (
20), and the locking body (30) is the throttle button (22).
), the throttle rod (2I) slides to the right in Fig. 1, and the air supply port (33) of the throttle bush (22) is opened, and the air is , from the ventilation groove (26) through the through hole (28), and from the ventilation groove (27) to the rotating reverse bushing (24).
The annular groove (37) is reached.

To rotate the air motor (16) to the right when viewed from the left in Figure 1, rotate the throttle (20) to the right and rotate the rotating reverse bushing (24) as shown in Figure 3(a).
, the state shown in FIG. 4(a) is established. Then, the annular groove (3
The air from 7) is sent to the clockwise rotation side air supply path (18) through the passage (47) to rotate the air motor (16) clockwise. At this time, the left rotation side air supply passage (17) is connected to the exhaust passage (1
Together with 9), it becomes an exhaust passage, and the air passes through the passage (46),
An annular groove (38), a passageway (48) and a discharge passageway (10).
) and is discharged through a silencer (12).

Next, in order to rotate the air motor (16) to the left, the throttle (20) is rotated to the left (in this embodiment, the air motor (16) is rotated 90 degrees from the clockwise rotation state). ), the rotating reverse bushing (24) is shown in Figure 3(b).
, the state shown in FIG. 4(b) is established. Then, the annular groove (3
The air from 7) is sent to the left rotation side air supply path (17) through the passage (46) to rotate the air motor (16) to the left. At this time, the right rotation side air supply passage (18) is connected to the exhaust passage (1
Together with 9), it becomes an exhaust passage, and the air passes through the passage (47),
Discharge passage (10) via annular groove (38) and passage (48)
and is discharged through a silencer (12).

Furthermore, since the air tool shown in this embodiment has a two-stage throttle, the throttle (20) is further pushed in as the second stage operation.
) is further slid to the right in FIG. ) is opened and a large amount of air is introduced directly into the ventilation groove (27), so the above operation causes the air motor (
16) rotates clockwise or counterclockwise at full speed.

By the operation of the throttle mechanism (7) and reverse mechanism (8) as described above, the air tool shown in this embodiment rotates the air motor (16) clockwise or counterclockwise, thereby rotating the striking part (2). ) by operating the striking mechanism of the main body (1).
The impact force is transmitted to the bit (5) attached to the tip of the screw to tighten or loosen screws.

〔Effect of the invention〕

Since the air tool of the invention of this application is configured as described above, it has the following effects.

First, in the invention described in claim 1 of this application, the throttle mechanism (7) and the reverse mechanism (8) can be operated by operating only the throttle (20), so the operation is very easy. It became.

Furthermore, in the invention according to claim 2 of this application, the throttle mechanism (7) is operated by pushing the throttle (20), and the reverse mechanism (8) is operated by rotating the throttle (20). Since the throttle mechanism (7) and the reverse mechanism (8) are integrally provided in the handle part (3), the handle part (3) is not bulky. It became low.

Furthermore, in the inventions described in Claims 1 and 2 of this application, even when the air tool is hung upside down, there is no reverse lever, so it is easier to work without contacting the ring finger or the like.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway sectional view of the air tool of the invention of this application. FIG. 2 is an enlarged sectional view of the throttle mechanism and reverse mechanism of the air tool. FIG. 3(a) is a cross-sectional view taken along line A-A in FIG. 1 showing the rotating state of the rotating reverse bushing when the air motor is rotated clockwise. Figure 3 (b
) is a cross-sectional view taken along line A-A in FIG. 1 showing the rotating state of the rotating reverse bushing when the air motor is rotated to the left. FIG. 4(a) is a sectional view taken along the line BB in FIG. 1 showing the rotating state of the rotating reverse bushing when the air motor is rotated clockwise. FIG. 4(b) is a cross-sectional view taken along line BB in FIG. 1 showing the rotating state of the rotating reverse bunsch when the air motor is rotated counterclockwise. Figure 5(a)
FIG. 1 is a front view showing an example of a conventional air tool. Figure 5 (
b) is a partially cutaway sectional view of the same air tool. Figure 6 (a
) is a front view showing the other side of a conventional air tool. Figure 6(b) is a partially cutaway cross-sectional view of the same air tool (7) (8) (20) (21) (22) (23) (24) (25)...Throttle mechanism...Reverse Mechanism: Throttle: Throttle rod: Throttle bushing: Pin: Rotating reverse bushing: Fixed reverse bushing

Claims (1)

[Claims] 1. Throttle rod (21) of throttle mechanism (7)
An air tool characterized in that a throttle (20) provided in the air tool is associated with a rotating reverse bush (24) of a reverse mechanism (8). 2. Throttle rod (2) equipped with throttle (20)
1) and a throttle mechanism (7) formed by slidably inserting the throttle bush (22) into the throttle bush (22);
The rotary reverse bush (24) has a pin (23) that engages with the fixed reverse bush (25) and into which the throttle bush (22) is slidably inserted.
). An air tool characterized by having a reverse mechanism (8) slidably inserted into the air tool.