Fluid operated fork positioning control system
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United States of America Patent
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Feb 18, 1992
Grant Date -
N/A
app pub date -
Dec 3, 1990
filing date -
Dec 3, 1990
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A control system for selectively moving load engaging forks along a carriage frame in first and second modes of operation is provided. In the first mode of operation the first and second forks are movable in unison and at the same rate of speed along the carriage frame and in the second mode of operation the forks are individually selectively movable. The control system includes a main control valve and first, second, and third selector valves for directing fluid flow delivered by the main control valve to first and second fluid operated jacks connected to the first and second forks, respectively, and the carriage frame. The third selector valve directs fluid flow between head ends of the jacks in the first mode of operation so that the first and second forks move in unison on the carriage frame. The control system is particularly suited for use on a material handling vehicle having a lift mast assembly.
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