Percussive action machine for making holes in the ground
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United States of America Patent
Stats
-
Jan 20, 1987
Grant Date -
N/A
app pub date -
Apr 4, 1985
filing date -
Apr 9, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A percussive action machine includes a housing in which a hammer is movably secured to define a forward stroke chamber and a return stroke chamber. The hammer is provided with an air-distributor fashioned as a sleeve having holes. The hammer is further provided with a device for alternately communicating the return stroke chamber with the forward stroke chamber and with the outside, the device having the form of at least one bore arranged inside the hammer in line with its axis. Communicating with this bore is a tubular control valve extending through the forward stroke chamber and having in its wall at least one hole wherethrough the return stroke chamber alternately communicates with the forward stroke chamber and with the outside.
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