Method and machine for altering the striking stroke of a percussive machine moved by a pressurized incompressible fluid
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United States of America Patent
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Sep 23, 1997
Grant Date -
N/A
app pub date -
Nov 30, 1995
filing date -
Dec 8, 1994
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Method and apparatus for controlling a percussive machine by determining, during the phase of rebound of a piston following impact, the existence of an instantaneous flow rate of fluid flowing from a top chamber toward the high-pressure fluid feed circuit. The instantaneous flow rate is determined on the basis of the differential pressure between the top chamber and the high pressure fluid feed circuit. If a flow rate is detected, a control device is fed with pressurized fluid so as to shift a selector piston in a direction for lengthening the stroke of the striking piston.
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