Percussive drills
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United States of America Patent
Stats
-
Apr 17, 1984
Grant Date -
N/A
app pub date -
Nov 17, 1981
filing date -
Nov 18, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A percussive drill has a bit holder, a percussive drive including a ram slidably mounted in a hollow piston, and a drive transmission for reciprocating the ram in the piston via an air cushion. The forward travel of the ram during percussive action of the drill is limited by a drill bit or an intermediate member interposed between the drill bit and the ram. A member holds the ram in a position further forward, than that attained during the above limited travel allowed the ram, when percussive action is not desired. The holding member is resilient, has a U shaped cross-section, and is entered by the ram as it moves to the further forward position, the ram then forming a seal therewith, and the member also functioning to absorb the energy of an impact by the ram.
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Cited Art Landscape
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