Tool driving or impacting – Impacting devices – With impact cushioning means
Reexamination Certificate
2006-06-14
2011-10-04
Low, Lindsay (Department: 3721)
Tool driving or impacting
Impacting devices
With impact cushioning means
C173S090000
Reexamination Certificate
active
08028762
ABSTRACT:
A tool assembly (10), for example a hydraulic or pneumatic hammer assembly, comprises a housing (11) defining a chamber (16), a reciprocating work tool (20) arranged in the chamber for cyclical movement in a work stroke and a return stroke, and a tool retention member (80) arranged to restrain the work tool at the end of the work stroke. The tool assembly (10) 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 (102, 154), which may be cantilevered from the tool retention member (80) to absorb impact at the end of the work stroke or may be provided on a bushing (150) 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.
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Pan Chunhui
Pillers, II Lauritz Phillip
Caterpillar Inc.
Low Lindsay
Murgitroyd and Company
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