JP3211225B2 - Sound reduction mechanism of pneumatic nailing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pneumatic nailing machine for driving a nail by using compressed air, wherein the exhaust air after the driving of the nail driving is discharged along the side surface of the body to reduce noise. Related to sound mechanism.

[0002]

2. Description of the Related Art A pneumatic nailer in which a nail is driven by using compressed air supplies compressed air into a hitting cylinder and drives a driver together with a hitting piston to hit the nail. The exhaust air after the nail driving is directly discharged from the upper end of the impact cylinder to the outside.

[0003] Recently, the use of higher-pressure air than before has been recognized as industrial compressed air. For this reason, by using high-pressure air for the pneumatic nailing machine, it is possible to develop a small and operable nailing machine with the same output as the conventional one.

[0004] However, while high output can be obtained from high-pressure air, there also arises a problem that the exhaust noise becomes loud. To reduce the exhaust noise, narrow the exhaust hole,
There is a method such as filling the exhaust passage with a filter,
In each of these cases, the exhaust performance was delayed so that the return performance of the impact piston (after nailing) was reduced, and the noise reduction effect was not so large.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems and to provide an exhaust chamber in a body of a pneumatic nailing machine so that exhaust noise can be reduced without impairing return performance of a striking piston. Its purpose is to provide a mechanism.

[0006]

Means for Achieving the Object To achieve the above object, a sound reducing mechanism of a pneumatic nailing machine according to the present invention comprises a head valve disposed above a striking cylinder provided inside a body. In a nailing machine that drives and drives a striking piston in a striking cylinder by supplying and discharging compressed air by actuation of a head valve, an inner cap containing the head valve therein is attached to the striking cylinder.
And place the cylinder cap around the inner cap.
The inner cap and the cylinder cap are arranged at the upper part of the body, and an exhaust chamber is provided between the inner cap and the cylinder cap.
It is formed along the side of the body , a throttle hole is formed below the exhaust chamber, and the head valve is
The exhaust air discharged by the operation is discharged from the throttle hole through the exhaust chamber.

It is preferable that the size of the aperture is adjustable.

[0008]

According to the first aspect of the present invention, by supplying compressed air into the striking cylinder, the striking piston is driven to perform nail driving. After the nail driving operation, the compressed air is discharged from above the striking and hitting cylinder.The exhaust air diffuses into the exhaust chamber and is exhausted, and the exhaust air in the exhaust chamber passes through the throttle hole to form the exhaust cover. It is diffused and discharged from the exhaust port.

As described above, the exhaust air discharged from the impact cylinder is discharged to the exhaust chamber at a stretch, and further diffused and discharged from the throttle hole. Therefore, the exhaust time can be extended, and the exhaust air is directly discharged to the outside. Exhaust sound is significantly reduced compared to the case where In particular, when high-pressure compressed air is used, a sufficiently large exhaust chamber can be formed because only a small striking piston is required to obtain the same output. Therefore, the discharge mechanism of the present invention is useful for a nailing machine of the type using high-pressure air.

In addition, the exhaust air discharged from the impact cylinder is immediately discharged to the exhaust chamber at once.
The exhaust of the exhaust air in the impact cylinder is not delayed. Therefore, the return performance of the striking piston is not impaired by the noise reduction of the exhaust sound.

Further, the exhaust chamber is not formed simply by attaching a cover to the outer periphery of the cylinder cap at intervals, but is formed along the side surface of the body. Since the exhaust chamber can be secured without increasing the height, the nailing machine can also be prevented from being enlarged in this respect.

According to the second aspect of the present invention, the size of the throttle hole of the exhaust chamber can be adjusted.
In cases where the aperture is made larger and the sound reduction effect is more important than rapid fire, as used in conventional construction methods, it is possible to further improve the sound reduction effect by reducing the aperture. it can.

[0013]

FIG. 1, FIG. 2 and FIG. 3 show a nailing machine according to the present invention. This nailing machine has a compressed air inside a body 1 like a normal pneumatic nailing machine. Source (not shown)
An air chamber 2 for storing compressed air taken in from the air and a striking cylinder / piston mechanism 3 are arranged. Then, the striking piston 3b in the striking cylinder 3a is reciprocated, and the driver 7 integrally connected to the striking piston 3b is driven into the nose portion 8 at the tip of the body 1, and the nail 9 supplied into the injection port of the nose portion 8 is moved. The driving is performed by hitting the material to be driven.

That is, as shown in FIG. 4, the trigger lever 4 pushes the valve stem 10 of the starting valve 5,
By moving the pilot valve 11 downward to open the air passage 12 to the exhaust port 13, the compressed air in the upper chamber 14 of the head valve 6 is exhausted from the exhaust port 13 to open and operate the head valve 6. The compressed air is rapidly supplied into the striking cylinder 3a to drive the striking piston 3b into the striking cylinder 3a.

When the trigger lever 4 is returned after nailing, the valve stem 10 of the starting valve 5 is moved downward by the spring 15, and at the same time, the pilot valve 11 is moved upward, and again the upper chamber of the head valve is moved from the air passage 12 to the upper chamber. When the compressed air is supplied to 14, the head valve 6 is closed and the exhaust hole is opened, and the compressed air supplied into the striking cylinder 3a is exhausted to the outside. At the same time, the blowback chamber 1 around the striking cylinder 3a compressed at the time of striking.
The striking piston 3b is moved upward by the compressed air stored in the tube 6, and returns to the initial top dead center position, so that the next nail driving is prepared.

When compressed air is discharged from the striking cylinder 3a after the striking piston 3b is driven, an exhaust noise is generated. The exhaust noise is reduced by the following noise reduction mechanism. Have been. That is, an inner cap 17 for housing the head valve 6 is disposed above the striking cylinder 3a, and the inner cap 17 has an exhaust hole 1 for exhaust air discharged from the striking cylinder 3a.
8 are formed. Then, the periphery of the inner cap 17 is covered with the cylinder cap 19, inner cap
Between the cylinder 7 and the cylinder cap 19
An exhaust chamber 20 is formed along the surface . A throttle hole 21 is formed below the exhaust chamber 20, and an exhaust cover 2 having a number of exhaust ports 22 is further formed below the throttle hole 21.
3 are provided.

When the head valve 6 is operating to close, the exhaust hole 18 of the inner cap 17 is open, and when the head valve 6 is operating to open, the exhaust hole 18 is closed.

In the above configuration, the head valve 6 is
When the closing operation is performed as described above, the exhaust hole 18 of the inner cap 17 is opened, so that the striking piston 3b moves upward (return), and the exhaust air discharged from above the striking cylinder 3a is discharged from the exhaust hole 18 into the exhaust chamber. The exhaust air in the exhaust chamber 20 is exhausted into the
Through the exhaust port 22 of the exhaust cover 23 to be exhausted.

As described above, the exhaust air discharged from the striking cylinder 3a is discharged at once from the exhaust hole 18 of the inner cap 17 into the exhaust chamber 20, and the exhaust air in the exhaust chamber 20 diffuses from the throttle hole 21. Therefore, the exhaust noise is significantly reduced as compared with the case where the air is directly exhausted from the exhaust hole 18 to the outside.

Further, since the exhaust air discharged from the impact cylinder 3a is rapidly discharged to the exhaust chamber 20,
The exhaust of the exhaust air in the impact cylinder 3a is not delayed. Therefore, the return performance of the striking piston 3b is not impaired by the noise reduction of the exhaust sound.

The exhaust chamber 20 is not formed simply by attaching a cover to the outer periphery of the cylinder cap 19 at intervals, but along the side surface of the body 1.
Since the exhaust chamber 20 can be secured without making the entire nailing machine high, it is possible to avoid an increase in the size of the nailing machine from this point as well.

As shown in FIG. 5, a mounting space 24 is formed above the throttle hole 21 of the exhaust chamber 20, and an arc-shaped baffle member 25 (see FIG. 6) is mounted in the mounting space 24 to restrict the throttle. The hole 21 may be configured to be able to be adjusted smaller.

As described above, the throttle hole 21 of the exhaust chamber 20
By making the size adjustable, it is possible to take advantage of the quick-fire performance even if the sound is sacrificed, such as in packing work, without using the above-mentioned obstruction member 25, and using it in a conventional construction method. As described above, when the noise reduction effect is regarded as more important than the rapid-fire characteristics, the noise reduction effect can be further improved by installing the obstruction member 25.

[Brief description of the drawings]

FIG. 1 is a side view of a nailing machine according to the present invention.

FIG. 2 is a longitudinal sectional view of the nailing machine.

FIG. 3 is a longitudinal sectional view of a main part of the body portion of the nailing machine shown in a cross section orthogonal to FIG. 2;

FIG. 4 is a longitudinal sectional view of a main part at the time of driving for nail driving.

FIG. 5 is a sectional view of a main part showing another example of the exhaust chamber.

FIG. 6 is a plan view of a baffle member.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Body 3a Impact cylinder 3b Impact piston 17 Inner cap 19 Cylinder cap 20 Exhaust chamber 21 Throttle hole

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B25C 7/00 B25C 1/04

Claims (2)

(57) [Claims] 1. A head valve placed on top of the striking cylinder disposed inside the body, action of the head valve
In a nailing machine that drives and drives a striking piston in a striking cylinder by supplying and discharging compressed air by movement, an inner cap containing the head valve therein is disposed above the striking cylinder, and Cover the periphery with a cylinder cap, place the inner cap and cylinder cap on top of the body, and
An exhaust chamber is formed along the side of the body , a throttle hole is formed below the exhaust chamber, and exhaust air exhausted from above the striking cylinder by the operation of the head valve is exhausted from the throttle hole through the exhaust chamber. A sound reduction mechanism for a pneumatic nailing machine. 2. The sound reduction mechanism for a pneumatic nailing machine according to claim 1, wherein the size of the throttle hole is adjustable.