JPH01240278A - Impact relaxation device for percussion tool - Google Patents

Abstract

PURPOSE:To relax the forward impact force of an intermediate striking hammer to prolong the life of a percussion tool, and reduce the weight of the tool by adhering a cushioning material to the inside of a front cover. CONSTITUTION:A striking hammer 4 strikes at an intermediate percussion hammer 7, and further the intermediate striking hammer 7 strikes at a tip-cutter 1. When the tip-cutter 1 backs off from a workpiece, the intermediate striking hammer 7 run out forward, collides with a cushioning material 10, and strikes the inner end face of a front cover 2 after keeping a fixed deflection. The impact force of the intermediate striking hammer 7 is, as a result, partially absorbed by the cushioning material 10, and thus the impact force applied to bolts 8, a cylinder case 6 is substantially relaxed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to an impact mitigation device for an impact tool such as an electronic hammer.

[Background of the invention]

This will be explained with reference to FIG. A front cover 2, which guides and holds the tip tool 1, is fastened to a cylinder case 6 by bolts 8.

The striker 4 strikes the intermediate striker 7, and the intermediate striker further strikes the tip tool 1. However, if the tip tool separates from the workpiece due to the tool operator interrupting work, etc., the intermediate striker The striking element flies forward and collides with the inner end surface of the front cover, receiving an impact force. This impact force is transmitted to the bolt and cylinder case, causing damage to them. In order to make each part sufficiently strong against this impact force, there was a drawback that the weight of the main body increased.

[Purpose of the invention]

An object of the present invention is to eliminate the above-mentioned drawbacks of the prior art and provide a means for alleviating the impact force exerted on this type of tool holding member, thereby increasing the lifespan and reducing the weight of the machine body.

[Summary of the invention]

The present invention limits the shape of the cushioning material to a practical size, and Focusing on the fact that by limiting the maximum deflection to a certain amount, it is possible to reduce the impact force and downsize the cushioning material, we designed the relationship between the intermediate impactor, the cushioning material, and the front cover to limit the maximum deflection of the cushioning material. It was devised.

[Embodiments of the invention]

Figure 1.2 is an embodiment of the present invention. In the figure,
1 is a tip tool, 2 is a front cover, 3 is a piston, 4 is a striking element, 5 is a cylinder, 6 is a cylinder case, 7 is an intermediate striking element, 8 is a bolt, 9 is a stop lever, and 1o is a buffer material. When the piston 3 is reciprocated, the air chamber 11
A reciprocating motion is generated in the striking element 4 through the air inside, and the intermediate striking element 7 and the tip tool 1 are repeatedly struck. A cushioning material 10 is fitted inside the front cover 2. This cushioning material is installed so that the end surface of the intermediate impactor 7 hits the cushioning material 1o before hitting the inside end surface of the front cover 2, and then hits the inside end surface of the front cover 2 without being given compression deflection. . The striker 4 strikes the intermediate striker 7, and the intermediate striker further strikes the tip tool 1, but when the tip tool 1 leaves the workpiece as shown in FIG. 2, the intermediate striker moves forward. It flies out, collides with the cushioning material 10, gives a certain amount of deflection, and then hits the inner end surface of the front cover 2. As a result, the forward impact force of the intermediate striker is partially absorbed by the buffer material 10, and the impact force applied to the bolt 8 and the cylinder case 6 is significantly alleviated, realizing a long-life, lightweight impact tool. .

〔Effect of the invention〕

According to the present invention, since the cushioning material is fitted inside the front cover, the forward impact force of the intermediate striker is alleviated, and an impact tool with a long life and reduced weight can be obtained.

[Brief explanation of the drawing]

FIG. 1 and FIG. 2 are longitudinal cross-sectional side views of essential parts showing one embodiment of the present invention, respectively. FIG. 3 is a longitudinal sectional view showing a conventional example. 1 is a tip tool, 2 is a front cover, 3 is a piston, 4 is a striker, 5 is a cylinder, 6 is a cylinder case,
7 is the intermediate striker, 8 is the bolt, 9 is the stop lever, 1
o is a buffer material, and 11 is an air chamber. Patent applicant name Hitachi Koki Co., Ltd.

Claims (1)

[Claims] In a tool holding device for an impact tool, comprising a front cover for mounting a tip tool and an intermediate element driven by a striking element and transmitting power to the tip tool, an axially abutting end surface of an intermediate striking element inside the front cover. An impact mitigation device for an impact tool, characterized in that a cushioning material protruding by a certain amount is fitted inside the front cover.