Fork lift hydraulic servo control valve
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jan 8, 1980
Grant Date -
N/A
app pub date -
Sep 11, 1978
filing date -
Sep 11, 1978
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A servo controlled, proportional valve is connected in parallel with a forklift truck control valve to regulate the speed at which the fork is raised or lowered by shunting the forklift pump output to the hydraulic fluid reservoir during the raising of the fork and by restricting the return flow of fluid from the lift jack during lowering of the fork with the setting of the proportional control valve being servo controlled in response to a fork height sensor.
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