Anti-plug control
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United States of America Patent
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-
Sep 22, 1987
Issued Date -
N/A
app pub date -
Mar 20, 1985
filing date -
Dec 13, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An anti-plug control for a drive to prevent jamming of a driven working element in response to an overload wherein said drive includes a hydrostatic transmission having a variable displacement unit and a fixed displacement unit connected in closed circuit. A servo control cylinder is connected to a swash plate of the variable displacement unit for causing positioning thereof. A normally closed pressure-responsive valve monitors the pressure in the high pressure side of the closed circuit and is openable when the pressure reaches a predetermined value to deliver fluid from the closed circuit to the servo control cylinder and modify the displacement of the variable displacement unit to increase the speed of the working element to attempt clearing the overloaded condition of the working element.
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