JP2007245306A - Hammering machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a hammering machine from malfunctioning by preventing noise reduction material from being frozen and completely discharging compressed air after completion of hammering work in a nailing machine or the like driven by compressed air. <P>SOLUTION: The noise reduction material is provided on the inside of a discharge port for discharging compressed air used for driving a piston after completion of hammering work, and at least two expansion chambers are provided, thus discharging the compressed air through the expansion chambers and the noise reduction material. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a nailing machine driven by compressed air in a nailing machine or the like that prevents the silencer from freezing due to exhaust, and reduces the momentum of exhaust and exhaust noise. .

  A driving machine that drives a piston by reciprocating the inside of a cylinder with compressed air and driving a stopper such as a nail by a drive bit attached to the piston in this process was used to drive the piston after driving. Compressed air is discharged from the exhaust port.

  Since the pressure of the compressed air to be discharged is large and the momentum of the exhaust is strong, there are problems that dust or dust is rolled up depending on the discharge direction and that the exhaust noise is large. A dust cap can be handled by rotating a cap that covers the exhaust port and changing the discharge direction by rotating the cap. Such a configuration is well known. It is also well known that a silencer made of a permeable porous body is provided around the exhaust port in order to reduce exhaust momentum and exhaust noise.

JP 10-291170 A

  However, simply providing a silencer has the following problems. That is, when the driving cycle is shortened and the compressed air is frequently discharged, the compressed air is adiabatically expanded when discharged from the exhaust port, and the vicinity of the exhaust port is cooled. As a result, the sound deadening material freezes and the sound deadening material becomes clogged, the compressed air is not discharged after the driving is finished, and the driving machine does not operate normally. An object of the present invention is to eliminate the above-mentioned drawbacks of the prior art and prevent malfunction of the driving machine by ensuring that the compressed air is discharged after the driving is completed.

  The above object is achieved by providing at least two expansion chambers between the sound deadening material and the main body, and discharging compressed air through the expansion chamber and the sound deadening material after the completion of driving.

  According to the present invention, since the compressed air once passes through the expansion chamber, the sound deadening material is hardly frozen. Therefore, the compressed air is surely discharged after the driving is completed, and the driving machine does not malfunction, and the operational effect of improving the reliability of the driving machine can be achieved. Further, since the exhaust material is discharged through the silencer, the momentum of exhaust gas and the exhaust noise are reduced, the dust near the exhaust port is reduced, and the exhaust noise is reduced.

  An embodiment of the electric power tool of the present invention will be described with reference to FIGS.

  A cylinder 11 is provided in the driving machine main body 1 in which a pressure accumulating chamber 35 (see FIG. 3) for storing compressed air from a compressor (not shown) is formed, and a piston 12 integrated with a drive bit 13 is provided in the cylinder 11. It is supported so that it can reciprocate.

  As shown in FIG. 2, a sleeve valve 2 fitted with a sleeve valve rubber 20 that opens and closes the upper end of the pressure accumulating chamber 35 is provided above the outer periphery of the cylinder 11. A chamber 21 is formed, and a spring 22 is provided to press the sleeve valve 2 upward.

  An exhaust port 3 and an exhaust hole 10 are provided on the side surface of the main body 1 and below the sleeve valve 2 for discharging compressed air after the completion of driving. A plurality of exhaust holes 10 are provided at equal intervals below the cylindrical surface of the sleeve valve 2. Further, two plate-like silencers 5 and 6 are provided inside the exhaust port 3, and the silencers 5 and 6 are made of a permeable porous material such as felt or urethane foam, as is well known.

  As shown in FIG. 5, the upper two portions of the sound deadening material 5 are cut out and a stepped portion 51 is formed, so that the main body 1 is formed between the sound deadening materials 5 and 6 and the inner wall 7 as shown in FIG. 3 and FIG. 4. As shown, a second expansion chamber 31 is formed. Therefore, the compressed air that has come out of the exhaust hole 10 is once depressurized in the first expansion chamber 32, then depressurized again in the second expansion chamber 31 through the communication path 41, and then through the sound deadening materials 5 and 6. It is discharged to the atmosphere, and compressed air is not discharged directly to the atmosphere. Therefore, exhaust momentum and exhaust noise are reduced. In addition, the groove | channel 52 (it is provided also in the silencer 6) provided in the silencer 5 is made to engage with the rib which is not shown in figure of the main body 1, and suppresses the motion of the circumferential direction with respect to the inner wall 7. Can do.

  When a trigger valve (not shown) is operated via the trigger lever 101 shown in FIG. 1, the sleeve valve lower chamber 21 communicates with the atmosphere via the trigger valve, and the sleeve valve 2 is lowered, as is well known. When the sleeve valve 2 is lowered, the exhaust passage 4 is closed and the upper end of the pressure accumulating chamber is opened. The compressed air in the pressure accumulating chamber enters the cylinder 11 and the piston 12 is rapidly lowered to strike a stopper (not shown) by the drive bit 13. Type in.

  When the trigger lever 101 is returned after the driving is completed, the sleeve valve 2 rises, closes the upper end of the pressure accumulating chamber and opens the exhaust passage 4, and discharges the compressed air in the cylinder 11 from the exhaust hole 10. The compressed air exiting from the exhaust hole 10 passes through the first expansion chamber 32 and the second expansion chamber 31 and is discharged from the exhaust port 3 to the atmosphere via the sound deadening materials 5 and 6. The above operation is performed every time the trigger lever 101 is operated in one driving cycle.

  Even when the driving period is shortened, a step 51 is provided in the muffler 5 as shown in FIG. 5, and the step 51 also serves as a part of the second expansion chamber 31. Since the volume is secured and the compressed air after the completion of driving is discharged through the first expansion chamber 32 and the second expansion chamber 31 as shown in FIGS. 2 to 4, the sound deadening materials 5 and 6 are hard to freeze. Become. Therefore, it is possible to continue normal driving operation without hindering the operation of the driving machine.

  In the said Example, although the 2nd expansion chamber 31 formed with the level | step-difference part 51 of the silencer 6 and the silencer 5, and the inner wall 7 of the main body 1 was made into two pieces, it is not limited to this number. Various modifications are possible. Further, the shape of the second expansion chamber 31 formed by the stepped portion 51 of the sound deadening material 5 and the inner wall 7 of the main body 1 need not be limited to the shape of FIGS. 2 to 4, and various modifications are possible.

  Further, the shape of the sound deadening material 5 may be provided with four step portions 51 as shown in FIG. 6, and the volume of the second expansion chamber 31 is increased by providing the stepped portions to the extent that there is no problem with the sound deadening. The sound deadening materials 5 and 6 are more difficult to freeze.

Overall view of the driving machine of the present invention The partial expanded sectional view which shows one Example of this invention driving machine. The partial expanded sectional view which shows one Example of this invention driving machine. The A section enlarged view of FIG. 2 which shows the state of exhaust_gas | exhaustion of this invention driving machine. The enlarged front view which shows one Example of the silencer of this invention driving machine. The expanded front view which shows the other Example of the silencing material of this invention driving machine

Explanation of symbols

1 is a driving machine body, 2 is a sleeve valve, 3 is an exhaust port, 4 is an exhaust passage, 5 and 6 are silencers, 7 is an inner wall, 10 is an exhaust hole, 11 is a cylinder, 12 is a piston, and 13 is a drive bit. , 20 is a sleeve valve rubber, 21 is a sleeve valve lower chamber, 22 is a spring, 31 and 32 are expansion chambers, 35 is a pressure accumulating chamber, 41 is a communication path, and 51 is a stepped portion.

Claims (2)

Exhaust port provided in the main body with compressed air used to drive the piston by driving a stopper with a drive bit attached to a piston reciprocating in a cylinder provided in the body, and after completion of driving In the driving machine which discharges from the above, a silencer is provided inside the exhaust port, and at least two expansion chambers are provided, and the compressed air is discharged via the expansion chamber and the silencer. To drive. The driving machine according to claim 1, wherein a part of the expansion chamber is provided in a part of the silencer.

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