Percussion device
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United States of America Patent
Stats
-
Dec 23, 1986
Grant Date -
N/A
app pub date -
Nov 1, 1984
filing date -
Nov 4, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A pneumatic hammer comprises a cylindrical housing, in which are a free piston, an anvil, and needles the rear ends of which end in heads designed to rest against the anvil and supported by a tool holder. The anvil comprises a steel cylinder in the lateral surface of which is an annular rebate. The cylinder is surrounded by a plastics material in the rebate, the outer surface of which material forms the cylindrical sliding surface of the anvil. The volume occupied by the plastics material is approximately 50% of the total volume, such that the mass of the anvil is approximately halved.
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