JPH0411021Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a small pneumatic hammer that strikes the head of a nail.

[Conventional technology and its problems]

Driving nails with a hammer is a common practice, but the hammer must be swung with the required swing width, making it extremely difficult to drive nails in a narrow space. There may be cases where this is not possible.

[Purpose of invention]

Therefore, the present invention aims to eliminate the above-mentioned disadvantages and provide a small and compact pneumatic hammer that can strike objects such as nails extremely efficiently and can also strike objects in narrow spaces. The purpose is

[Structure of the idea]

In order to achieve the above object, this invention incorporates a piston inside a cylinder whose lower end is open and whose upper end is closed so that it can slide for a predetermined stroke.
A spring is provided to deflect the piston upward, an air supply hole is formed in the cylinder within the sliding range of the piston, an exhaust hole is provided in the sliding range of the upper surface of the piston at a position above the air supply hole, and the cylinder is provided with an exhaust hole within the sliding range of the upper surface of the piston. The piston is provided with a passage that communicates the pressure chamber above the piston with the air supply hole when the piston is in the raised state.

[Effect]

In the pneumatic hammer configured as described above, when compressed air is supplied to the air supply hole, the compressed air flows into the pressure chamber from the passage provided in the piston, so that the piston rapidly descends. In the lowered state, the air supply hole and the passage are out of position, and on the other hand, the pressure chamber and the exhaust hole communicate with each other, so that the compressed air in the pressure chamber is discharged to the outside. Therefore, the piston rises due to the elasticity of the spring, and the air supply hole and the passage communicate with each other.

Therefore, by bringing the lower end of the piston into contact with an object to be struck, such as a nail, and supplying compressed air to the air supply hole, the object to be struck can be continuously struck by the piston.

〔Example〕

Hereinafter, embodiments of this invention will be described based on the accompanying drawings.

As shown in the figure, the pneumatic hammer according to the invention includes a cylinder 1 and a piston 10 slidably built into the cylinder 1.
The lower end is open, the upper end is closed, and an insertion hole 2 is formed at the closed end.

A rod 11 provided on the upper surface of the piston 10 is inserted into the insertion hole 2 and protrudes upward, and a disc spring 13 is installed between the protrusion 12 provided at the protruding end and the closed end of the cylinder 1 to move the piston 10 upward. deflected to
The piston 10 can slide within the range in which the disc spring 13 is flattened.

An air supply hole 3 is formed in the cylinder 1 within the sliding range of the piston 10. Further, an exhaust hole 4 is provided above the air supply hole 3, and when the piston 10 descends to the bottom dead center, the exhaust hole 4 opens and connects the pressure chamber 14 formed above the piston 10 with the outside. communicate.

On the other hand, the piston 10 is provided with a passage 15 that communicates the air supply hole 3 with the pressure chamber 14 above the piston when the piston 10 is deflected upward by the elasticity of the disc spring 13. This passage 15 includes an annular groove 16 formed on the upper outer circumference of the piston 10 and a plurality of small holes 17 formed from the upper surface of the piston 10 toward the annular groove 16.
It consists of

5 in the figure indicates a cover attached to the upper part of the cylinder 1. Further, 18 indicates a striking piece made of synthetic resin embedded in the lower surface of the piston 10.

The pneumatic hammer shown in the embodiment has the above structure, and is small enough to be held with one hand.

Now, when compressed air is supplied to the air supply hole 3, the compressed air flows from the passage 15 to the pressure chamber 1.
4, the pressure chamber 14
The pressure increases, and the piston 10 rapidly descends against the elasticity of the disc spring 13. In that state,
The air supply hole 3 and the passage 15 are displaced from each other as shown in FIG. 3, and the exhaust hole 4 communicates with the pressure chamber 14. Therefore, the compressed air in the pressure chamber 14 flows out from the exhaust hole 4, and the piston 10 is pulled up by the elasticity of the disc spring 13.
The passage 15 and the air supply hole 3 communicate with each other, and the above operation is repeated.

Therefore, by bringing the lower surface of the piston 10 into contact with an object to be struck, such as a nail, and supplying compressed air to the air supply hole 3, the object to be struck can be continuously struck by the piston 10.

In the case of the embodiment, the rod 11 provided on the top surface of the piston 10 was inserted into the insertion hole 2, and the protrusion 12 was provided on the top of the rod 11 to restrict the sliding amount of the piston 10. The mechanism is not limited to this, and for example, an axial guide groove may be formed on the outer circumferential surface of the piston, and a protrusion inserted into the guide groove may be provided on the inner surface of the cylinder to limit the sliding amount of the piston.

〔effect〕

As described above, according to this invention, by supplying compressed air to the air supply hole, the compressed air flows into the pressure chamber and pushes down the piston, and the piston is lowered by the elasticity of the spring. By bringing the piston into contact with the object to be hit and supplying compressed air to the air supply hole, the object to be hit can be hit, and the hitting work can be performed efficiently.

In addition, it has a simple and compact structure with a piston built inside the cylinder, making it easy to use, and since the object to be hit is struck by the vertical movement of the piston, striking work can be done even in narrow spaces. can be done.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional front view showing an embodiment of the pneumatic hammer according to the invention, FIG. 2 is a perspective view of the same piston, and FIG. 3 is a longitudinal sectional front view showing the same operating state. 1... Cylinder, 3... Air supply hole, 4... Exhaust hole, 10... Cylinder, 14... Pressure chamber, 15... Passage.

Claims (1)

[Scope of utility model registration request] It consists of a cylinder whose lower end is open and whose upper end is closed, a piston built into the cylinder so that it can slide for a predetermined stroke, and a spring that biases this piston upward. an air supply hole is formed in the air supply hole; an exhaust hole is provided in a sliding range of the upper surface of the piston at a position above the air supply hole; A pneumatic hammer provided with a passage that communicates between the air supply hole and the air supply hole.