Electrically driven hammer machine
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United States of America Patent
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-
Jul 22, 1986
Grant Date -
N/A
app pub date -
Sep 14, 1983
filing date -
Sep 22, 1982
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An electrically driven hammer machine comprising a driving piston (103) and a hammer piston (104) driven by the driving piston via a pressure gas cushion (106). The driving piston is driven by a brushless alternating current motor (101) via a crank mechanism (105). A solid state inverter (107) in the power supply conduit (102) supplies power of variable amplitude and frequency to the motor.
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