Hydraulic door operating system
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United States of America Patent
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-
Jul 13, 1999
Grant Date -
N/A
app pub date -
May 15, 1997
filing date -
May 16, 1996
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A hydraulic system for opening and/or closing the rear lift gate of a vehicle uses a double or single acting gas charged hydraulic cylinder. If double acting, a second piston separates the head side of the cylinder into hydraulic and gas chambers. A unidirectional (for the single acting cylinder) or a bidirectional (for the double acting cylinder) drives a pump to operate the cylinder. A solenoid actuated on-off valve selectively communicates the ports of the cylinder with tank pressure. A gas charge accumulator may also be provided. In the double acting embodiment, a two way ball shuttle valve which is vented in the center provides alternating communication between the two cylinder ports.
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Cited Art Landscape
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