JPS6037261Y2 - Air passage control device for rotary tools - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an air passage control device for an impact wrench or other rotary tool using an air motor as a driving source.

The applicant of the present invention has previously developed a device of this type in which a valve is provided in a grip part extending downward from a tool body having an air motor therein, and which is linked to a trigger on the front, and the valve controls an air passage leading to the motor. We have proposed a type in which the valve is configured as a spool valve that moves up and down in the outer spool in conjunction with the trigger. In this case, the spool valve is likely to cause air leakage through the gap between the spool valve and the sleeve,
As a result, air consumption and abnormal noises occur, which are disadvantageous.

The object of the present invention is to obtain a device that does not have the above disadvantages.
In a grip part 3 extending downward from the grip part 3, a valve is provided which is linked to a trigger 4 on the front surface, and the air passage leading to the motor 1 is controlled by the valve. A spool valve 6 moves up and down inside a sleeve 5 on the outer periphery in conjunction with the spool valve 4, and ball valves 8, 8 on both sides of the spool valve 6, which are pushed by the spool valve 6 and open against the respective springs 7, 7. .

The air passages include an air passage 9 for forward rotation and an air passage 1 for reverse rotation.
0, both passages 9 and 10 are controlled to be selectively connected to an air supply chamber 11 connected to an external air source and an exhaust chamber 12 connected to outside air. Reference numerals 8 and 8 denote respective connection portions between the passages 9 and 10 and the air supply chamber 11, that is, the passages 9.
. ，
Intervention was made on the exhaust side of 10.

To explain its operation, when the trigger 4 is pulled, the spool valve 6 moves downward as shown in the second figure, and the lower ball valve 8 is pushed open by this, and the spool valve 6 opens as shown in the fourth figure. High-pressure air is introduced into the diverted air passage 9 from the air supply chamber 11 via the valve 8, and the motor 1 rotates normally.

At this time, the upper valve hole 6a of the spool valve 6 is open, and thus, as shown in FIG.
It communicates with the exhaust chamber 12 via a, and exhaust is performed through this.

Next, consider the case where the trigger 4 is pressed, as shown in Figure 3, the upper ball valve 8 is pushed open by this, and the air passage 10 for reverse rotation opens as shown in Figure 6. High-pressure air is introduced from the air supply chamber 11 through the valve 8, and the motor 1 is rotated in reverse.

At this time, the lower valve hole 6a of the spool valve 6 is opened.
The valve hole 6a communicates the inside of the air passage 9 for normal rotation with the exhaust chamber 12, as shown in FIG. 7, and allows exhaust through this.

In this way, according to the present invention, the valve interlocked with the trigger 4 is composed of the spool valve 6 and the ball valves 8, 8 on both outsides of the spool valve 6, which are pushed to open by the ball valves 8, 8. By providing a closed valve on each air supply side, it is possible to eliminate air leakage that tends to occur in conventional systems, and the above-mentioned disadvantages can be avoided.

[Brief explanation of the drawing]

Figure 1 is a cutaway side view of the entire tool equipped with the proposed device;
Figures 6 and 3 are cross-sectional side views of essential parts in each operating state, Figures 4 and 5 are cross-sectional views taken along the rV-rV line and ■-V line in Figure 2. Figures 6 and 7 are 3 is a cross-sectional view taken along lines VI--VI and ---. 1... Air motor, 2... Tool body,
3... Grip part, 4... Trigger, 5...
...Sleeve, 6...Spool valve, 7,
7... Spring, 8. Death...Ball valve.

Claims (1)

[Scope of utility model registration request] A grip part 3 extending downward from a tool body 2 having an air motor 1 therein is provided with a valve that is linked to a trigger 4 on the front, and the air passage leading to the motor 1 is controlled by the valve. A spool valve 6 which moves up and down within a sleeve 5 on its outer periphery in conjunction with the trigger 4, and a ball valve 8 on both outsides of which are pushed by the spool valve 6 and open against respective springs 7, 7. An air passage control device in a rotary device consisting of: