JPS6221414Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a pneumatic tool equipped with a hydraulic impact generator.

Conventionally, this type of pneumatic tool has been equipped with an air motor 1, a hydraulic impact generator 2, and an operating valve 3, as shown in FIG. 1, and the operating valve 3 supplies air to the air motor 1. It is generally well known that the drive shaft 4 is rotated impulsively via the hydraulic impact generator 2 by driving the air motor 1.

By the way, in the above-mentioned conventional pneumatic tool, a relief valve 5 for controlling the maximum pressure of the hydraulic impact generating section 2 is provided in the cylinder 6 in which the hydraulic impact generating section 2 rotates. Therefore, the pressure adjustment of the relief valve 5 has the following drawbacks. That is, when adjusting the pressure of the relief valve 5, first remove the cap 9 from the cap attachment hole 8 of the housing 7, then rotate the cylinder 6 to adjust the position of the relief valve 5 and the cap attachment hole 8. Then, the pressure of the relief valve 5 must be adjusted using a tool (not shown), which makes the adjustment work complicated, and has disadvantages such as losing the cap 9 and requiring tools.

Therefore, the purpose of this invention is to enable the relief valve of the hydraulic impact generator of a pneumatic tool to be directly and easily operated from the outside.

In order to achieve the above object, the structure and operation of this invention are such that a relief valve is disposed at the center of rotation of the hydraulic shock generator, and an operating rod for operating the relief valve is provided through a through hole formed at the center of rotation of the air motor. A feature of the relief valve is that by disposing it in the hole, the relief valve can be directly and easily operated from the outside using an operating rod.

This invention will be explained in detail below with reference to illustrated embodiments.

In FIG. 2, 11 is an air motor in which a rotor 13 having vanes 12 rotates within a cylinder 14; 15 is an air motor that is integrally connected to a drive shaft 16;
A hydraulic impact generating section in which a spindle 18 having a numeral 7 rotates relatively within a cylinder 23 whose both ends are covered with upper and lower lids 21 and 22, and 25 is an operating valve that controls the supply of air to the air motor 11. This is a well-known structure in which the rotation of the rotor 13 of the air motor 11 is transmitted to the cylinder 23 via the upper cover 21, and the high-speed rotation of the cylinder 23 causes the spindle 18 to rotate impulsively (pulse-like).

A relief valve 2 is located at the center of rotation of the hydraulic shock generating section 15, that is, the center of rotation of the spindle 18.
There are 6. The relief valve 26 includes a high pressure side passage 27 and a low pressure side passage 2 provided in the spindle 18.
A ball-shaped valve body 31 is removably provided on the valve seat 29 between the valve body 8 and the adjusting screw 3 with a hexagonal hole 33 for controlling the amount of lift of the valve body 31 with respect to the valve seat 29.
4 is screwed onto the axis of the spindle 18 from the left end in FIG.

On the other hand, a through hole 35 is formed at the rotation center of the air motor 11, that is, the rotation center of the rotor 13, and a hexagonal rod portion 36 that fits into the hexagon hole 33 of the adjustment screw 34 is inserted into the through hole 35 at the tip thereof. An operating rod 37 is disposed around the periphery with a gap, and is slidably and rotatably supported by the housing 38. The handle portion 41 of the operating rod 37 projects outward from the housing 38, and
The hexagonal rod portion 36 and the adjustment screw 34 are separated from each other by being biased outward by a coil spring 42.

Note that 45, 46, 47, 48, and 49 are oil seals.

According to the pneumatic tool having the above configuration, the operating rod 37
Push in the handle part 41 and fit the hexagonal rod part 36 into the hexagonal hole 33 of the adjustment screw 34, and then tighten the operating rod 37.
By rotating the adjusting screw 34, the amount of lift of the valve body 31 of the relief valve 26 can be controlled, and the pressure of the relief valve 26 can be easily adjusted directly from the outside.

In the above embodiment, the relief valve controls the set pressure by the lift amount of the valve body, but it may also include a coil spring and control the set pressure by adjusting the spring force of the coil spring. good.

As is clear from the above description, since the pneumatic tool of this invention is constructed as described above, it has the advantage that the relief valve can be directly and easily operated from the outside.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional example, and FIG. 2 is a sectional view of an embodiment of this invention. 11...Air motor, 15...Hydraulic shock generator, 16...Drive shaft, 26...Relief valve, 35
...Through hole, 37...Operation rod.

Claims (1)

[Scope of Claim for Utility Model Registration] A pneumatic tool in which a drive shaft is impulsively rotated by an air motor via a hydraulic impact generating part, and the maximum pressure of the hydraulic impact generating part is controlled by a relief valve, A valve is disposed at the rotation center of the hydraulic shock generator, and an operating rod for operating the relief valve is disposed in a through hole formed at the rotation center of the air motor, so that the relief valve can be directly operated from the outside. A pneumatic tool characterized by being able to perform