JPH09317825A - Vibration damping device for spring mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the vibration and noises of a spring mechanism. SOLUTION: As one example of a spring mechanism, a vibration damping material ring spacer 17 made of elastic rubber or the like is inserted into each of the spring receiving seats of the end cap 15 and the piston 14 of the needle feed spring offset type air cylinder 12 of a pneumatic nailling machine. During nailling, the piston 14 is retreated by pressurized air, when the nailling is completed, the piston 14 is moved forward, a nail n2 is fitted in a driver passage 3a and the piston 14 clashes with the front end inner wall part of the cylinder 12 and stops. At this time, the vibration control spacer 17 absorbs the vibration of a compression coil spring 16 and the resonance of the air cylinder main body is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration damping device for a spring mechanism, and more particularly to a vibration damping device for a spring mechanism that reduces vibration of a spring interposed in a movable member such as a piston.

[0002]

2. Description of the Related Art A spring is interposed between a movable member such as a slider, a piston, or a lever and a fixed member with which the movable member is engaged, and the elastic force of the spring causes the movable member to move. The spring mechanism that gives a restoring force to the initial position is used in various machines. For example, taking an air nailer as an example, a nail feed device using a spring offset type air cylinder is mounted in order to feed a linked nail from a nail magazine into the nose portion of the air nailer. A nail feed claw is pivotally attached to the piston rod of the air cylinder, the piston is offset to the front end position of the stroke by a compression coil spring, and the piston moves backward when pressurized air is supplied.

Upon activation of the nailing piston, pressurized air accumulates in the lower blowback chamber within the housing,
The pressure air supplied from the blowback chamber to the nail feeding air cylinder causes the piston to compress the compression coil spring and retract. Then, when the nailing piston returns to the standby position, the pressure of the blowback chamber is reduced and the compression coil spring advances the nail feeding piston, and the nail feeding nail feeds the leading nail of the connection type nail into the nose portion, The piston collides with the inner wall surface at the end of the cylinder and stops. At this time, the expansion operation of the compression coil spring is suddenly stopped, vibration is generated in the compression coil spring, and this vibration is propagated to the nose portion, causing resonance in the housing of the air nailer,
The operator's hand holding the pneumatic nailing machine is vibrated to cause discomfort.

As described above, a spring mechanism constructed such that a movable member such as a piston or a slider is rapidly returned to an initial position by a spring is apt to cause resonance, and vibration or noise is generated in a hand-held power tool or the like. It is desired to reduce it as much as possible. Therefore, a technical problem to be solved in order to suppress the vibration of the spring mechanism arises, and an object of the present invention is to solve the above problem.

[0005]

DISCLOSURE OF THE INVENTION The present invention is proposed in order to achieve the above-mentioned object, and is provided between a movable member such as a slider, a piston, or a lever, and a fixed member with which the movable member engages. A vibration damping device of a spring mechanism in which a spring is interposed between the movable member and the movable member, and a restoring force to the movable member is applied to the movable member. Alternatively, the invention provides a vibration damping device having a spring mechanism in which a spacer made of a damping material such as silicone gel is interposed.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 1 shows an air nailer 1, in which a die-cast housing 2 is formed by integrally forming a mechanism housing 2a and a grip 2b. An air cylinder is inserted into the mechanism housing 2a whose both ends are open, the nose block 3 is coupled to the front end of the mechanism housing 2a, and the end cap 4 is attached to the rear end opening.

By connecting the air hose connector 5 connected to the end of the grip 2b and the air compressor with a hose, pressurized air is supplied to the periphery of the air cylinder and the pressurized air chamber in the grip 2b.

The head valve of the air cylinder is controlled by a trigger valve built into the base of the grip 2b,
Contact arm 6 mounted on the nose block 3
The combined operation of pushing in and pulling the trigger lever 7 opens the trigger valve, and the air chamber of the air cylinder communicates with the pressure air chamber. As a result, the piston is activated and the driver rod connected to the piston is moved to the nose block 3
Eject the nail inside. A nail guide 9 that connects the nail magazine 8 and the nose block 3 is provided on the side surface of the nose block 3.
An openable and closable nail guide cover 10 covering the nail passage of the nail guide 9 is provided, and a nail feeding device is arranged on the back surface of the nail guide 9.

FIG. 2 shows the nail feeding device 11 and the nail guide 9
A spring offset type air cylinder 12 is mounted on the back surface of the parallel to the nail guide 9. The port 13 at the front of the air cylinder 12 is connected to the blowback chamber of the air nailer via a pipe (not shown), and the piston 14 is connected to the piston 14 and the end cap 15 by a compression coil spring 16. It is offset forward (left in the figure). Also, the end cap 15 and the piston 14
A damping material ring spacer 17 made of elastic rubber or silicone gel having high damping performance is inserted in each spring receiving seat.

A nail feed pawl 19 is pivotally attached to the front portion of the piston rod 18 projecting forward, and the nail feed pawl 19 is biased counterclockwise in the figure by a torsion coil spring (not shown), The tip portion projecting laterally from the portion projects into the nail guide 9 through the long groove 9 a of the nail guide 9.

Claws 19a and 19b are formed on the front and rear of the tip surface of the nail feeding claw 19 facing the nail n.
Since the rear edges of a and 19b are inclined surfaces that are inclined rearward, when the piston 14 retracts, the claw portions 19a and 19b ride on the nail n and retract, and when the piston 14 moves forward, the claw portions 19a and 19b.
b enters between the nails n and pushes the nail n forward.

As shown in the figure, the leading nail n1 connected by the plastic belt B is the nose block 3
The second nail n2 is engaged between the claw portions 19a and 19b in the standby state where it is loaded in the inner driver passage 3a. Then, when the trigger is operated, the driver descends in the driver passage 3a and ejects the leading nail n1,
The second and subsequent nails are held in place by the nail feed nails 19.

After the nail is driven, the driver is moved up to the initial position by the pressure air accumulated in the blowback chamber, the piston 14 of the spring offset type air cylinder 12 is retracted, and the front nail portion of the nail feed nail 19 is moved. 19
a enters between the second nail n2 and the third nail n3, and the rear nail portion 19b has the third nail n3 and the fourth nail n.
Get in between 4.

Then, the piston 14 advances due to the pressure drop in the blowback chamber, loads the nail n2 into the driver passage 3a, and stops the piston 14 by colliding with the inner wall surface of the front end portion of the air cylinder 12. At this time,
The expansion operation of the compression coil spring 16 is suddenly stopped to generate vibration, but the vibration of the compression coil spring 16 is absorbed by the damping material ring spacer 17 and is hardly transmitted to the air cylinder body. Therefore, the resonance of the housing and the grip, which is uncomfortable for the operator, is significantly reduced. Although illustration is omitted, a metal or resin washer may be interposed between the compression coil spring 16 and the damping material ring spacer 17 to improve the durability of the damping material ring spacer 17. .

Further, in a power tool such as a pneumatic nailing machine, resonance occurs in various parts due to impact during operation,
For example, the bracket 2 at the end of the grip 2b shown in FIG.
When the belt hanging hook 20 is fixed to the c by bolts and nuts, the hook 20 may resonate and generate noise. In this case, as shown in FIGS. 3 and 4, by mounting a rubber O-ring 21 or a damping material ring spacer between the bracket 2c and the hook 20, the bolt 22 and the nut 23 are fastened. , Hook 20
Is suppressed and the volume of the unpleasant resonance sound is remarkably reduced, which is effective in reducing vibration and noise together with the above-described vibration damping device of the spring mechanism.

The present invention is not limited to the above-described embodiment, and various modifications can be made within the technical scope of the present invention, and it goes without saying that the present invention extends to those modifications. is there.

[0017]

As described above, according to the present invention, the spacers of the damping material are provided at both ends of the spring of the spring mechanism to absorb the vibration when the spring returns to the initial state and stops. , Effective in reducing noise and resonance.

[Brief description of the drawings]

FIG. 1 is a side view of an air nailer.

FIG. 2 is a plan sectional view of a nail feeding device of an air nailer.

FIG. 3 is a side view showing a hook attached to a grip of an air nailer.

FIG. 4 is an exploded view taken along the line AA of FIG.

[Explanation of symbols]

 1 Air nailer 2 Housing 2a Mechanism housing 2b Grip 3 Nose block 9 Nail guide 11 Nail feeder 12 Spring offset type air cylinder 13 Front port 14 Piston 15 End cap 16 Compression coil spring 17 Damper ring spacer 18 Piston rod 19 nail feed nail

Claims (1)

[Claims] 1. A spring is provided between a movable member such as a slider, a piston, or a lever and a fixed member with which the movable member engages, and a restoring force to the initial position is given to the movable member by the spring. A vibration damping device for a spring mechanism, wherein a spacer made of a damping material such as elastic rubber or silicone gel is provided at each contact point between the movable member and the fixed member and the spring.