Shock absorber for the holding assembly of a reciprocating tool

Abstract

A tool assembly, for example a hydraulic or pneumatic hammer assembly, comprises a housing defining a chamber, a reciprocating work tool arranged in the chamber for cyclical movement in a work stroke and a return stroke, and a tool retention member arranged to restrain the work tool at the end of the work stroke. The tool assembly includes a shock absorber arranged to absorb impact from the work tool at the end of a stroke. The shock absorber comprises an annular resilient flange, which may be cantilevered from the tool retention member to absorb impact at the end of the work stroke or may be provided on a bushing arranged to absorb impact at the end of the return stroke. The shock absorbing flange reduces the transmission of shocks into the tool assembly, thereby providing increased life for tool assembly components.

Description

technical field

[0001] The present invention relates generally to an apparatus for absorbing shocks in a tool assembly having a reciprocating work tool, and more particularly to a shock absorber for a hydraulic, electric or pneumatic impact tool assembly. Background technique

[0002] Hydraulic hammers are used on job sites for breaking up large hard objects prior to handling them. Hammers can be backhoe or excavator mounted, or hand-held. Typically, the hammer assembly is powered by a hydraulic or pneumatic pressure source. During a working or power stroke, higher fluid pressure is exerted on the first shoulder of the piston, thereby driving the piston in a forward direction. The piston then strikes a work tool, commonly referred to as a cutter, which is driven forward so that the working end of the work tool strikes stones, cement, asphalt or other hard objects to be broken up.

[0003] During a return stroke, fluid pressure is exerted on the second shoulder of the pist...

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