JPH03178784A - Piston damper for driving machine - Google Patents

Abstract

PURPOSE:To make the projection part of a lower part piston damper not being cut by the angular part of a drive bit, even in case of an upper part piston damper being rotated at a percussion time, by bisecting the shape of the piston damper of a driving machine in upper and lower parts and also providing the projection part engaged with a main body on the lower part piston damper. CONSTITUTION:An impulse force is dispersed at a driving time because of a piston damper 10 being divided into upper and lower piston dampers 10c, 10d. Also, the rotation of the piston damper 10 at the backward stroke of a piston 14 is capable of the upper piston damper 10c only and no hindrance is caused even in case of its rotation. The lower piston damper 10d is not rotated because of the projection part 10e of the lower piston damper 10d being engaged with the recessed part 1a of a main body 1. Consequently this projection part 10e is not cut, no hindrance is caused on the backward stroke of the piston by preventing the leakage of an excessive air and the durability can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a piston damper that cushions the impact when driving a stopper or the like.

[Background of the invention]

The structure of the driving machine with the piston damper of the prior art is the third one.
As shown in the figure.

In the figure, by operating the trigger 4 of the main body 1, the control valve 3 opens and closes, the head valve 13 rises,
The compressed fluid in the pressure storage chamber 2 flows into the upper surface of the piston 14 in the cylinder 7 through the gap between the head valve 13 and the inner end of the cylinder 7, and rapidly descends to unite the stopper in the injection port 9 with the piston 14. It has a structure in which it is driven in with the tip of the drive bit 8 of the structure. A piston damper 10 made of an elastic material such as urethane rubber is disposed below the cylinder 7, and the piston damper 10 alleviates the impact force at the time of driving. A window 10f is provided which has a sealing function to prevent leakage to the drive bit 8 and has a slight gap with the drive bit 8. (
(Fig. 4) This clearance is important in the return process of the piston 8, and if it is not an appropriate clearance, continuous driving will be hindered.

FIG. 4 shows a prior art piston damper 10. When alleviating the impact force at the time of driving or during the return process of the piston 14, the piston damper 10 rotates, and as a result, as shown in FIG. The corner of the piston was scraped off, and the compressed air accumulated for the return movement of the piston 4 leaked outside through the gap in the large piston damper window 10f, causing the problem that the piston did not return completely. .

Furthermore, when used continuously, the window portion of the piston damper may be damaged or cut off, and the broken pieces may enter the interior of the main body and cause problems in the sliding portion.

[Purpose of the invention]

An object of the present invention is to eliminate the above-mentioned drawbacks of the prior art, to increase the durability of a piston damper without causing any trouble in the return process of the piston. [Summary of the Invention] In a piston damper for relieving force, the piston damper rotates when the piston hits, so the lower piston damper is constructed as a separate structure and the shape of the lower piston damper is devised so that there is no problem when the piston damper rotates.

[Embodiments of the invention]

An embodiment according to the present invention is shown in FIGS. 1 and 2.

In the figure, the structure of the main body, trigger, etc. (not shown), and the principle of operation are the same as those of the prior art shown in FIG. 3. FIG. 1 shows the piston damper 10 as an upper piston damper 10.
c. It has a structure in which the lower piston damper 10d is divided into two parts, and as shown in FIG.
has been established.

During driving, since the piston damper 10 is divided, the impact force is dispersed, and only the upper piston damper 10c can rotate the piston damper 10 during the return process of the piston 14, and even if it rotates, it will not cause any trouble. There isn't. Further, since the convex portion 10e of the lower piston damper 10d is fitted into the recessed portion 1a of the main body 1, the lower piston damper 10d does not rotate.

〔Effect of the invention〕

According to the present invention, the shape of the piston damper 10 of the driving machine is divided into an upper part and a lower part, and the lower piston damper 10d is provided with a convex part that engages with the main body 1, so that the upper piston damper 10c does not rotate during impact. However, the protrusion 10f of the lower piston damper 10d is not cut by the corner of the drive bit 8. Therefore, excessive air leakage can be prevented and the return process of the piston will not be hindered, and durability can be improved.

[Brief explanation of drawings]

Fig. 1 is a side view of essential parts showing an embodiment of the piston damper of the driving machine according to the present invention, and Fig. 2 shows the lower piston damper of Fig. 1. Figure 3 is a partial cross-sectional side view showing the entire conventional driving machine, Figure 4 is a side view of the main part of the piston damper of the conventional driving machine, and Figure 5 is taken along line A-A in Figure 4. FIG. 1 is a driving machine main body, 7 is a cylinder, 10 is a piston damper, 10c is an upper piston damper, 10d is a lower piston damper, loe is a convex portion of the lower piston damper, and workpiece 1 is a stop.

Claims (1)

[Claims] The driving machine uses compressed gas as a power source and drives a stopper etc. by a piston that moves up and down inside a cylinder provided inside the main body, and has a piston damper that reduces the impact force of the piston during driving. The piston damper is divided into an upper piston damper that directly cushions the impact and a lower piston damper that discharges compressed gas when the piston returns, and the lower piston damper is fitted with a part of the main body, and a convex or concave portion is formed on the outer periphery. What is claimed is: 1. A piston damper for a driving machine, characterized in that a part of the main body is also provided with a part that engages with the convex part or the concave part.