Overload preventive device
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United States of America Patent
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Aug 4, 1998
Grant Date -
N/A
app pub date -
Nov 17, 1995
filing date -
Feb 13, 1995
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An overload preventive device is capable of preventing elevation of preload pressure due to sticking action or break-through load of a hydraulic cylinder of a press machine. A delay valve for opening when the internal pressure of the load detecting circuit is lower than the minimum pressure to be maintained continuously over a specified time is interposed between a hydraulic pump for supplying pressurized oil of a specified pressure to a load detecting circuit.
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