Vertically storing dock leveler
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United States of America Patent
Stats
-
Jun 2, 1992
Issued Date -
N/A
app pub date -
Jul 2, 1991
filing date -
May 3, 1990
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A hydraulic lift bridge/leveler that is raised by an hydraulic cylinder and lowered primarily by gravity. A toggle mechanism is used to lock the bridge in a near vertical position. An auxiliary cylinder moves a lock-out arm assembly to release the toggle mechanism and power the bridge downward to a point where the weight moment through the pivot point is significantly large that the bridge will lower itself by gravity. The main cylinder employs a cushion mechanism that decelerates the bridge by slowly increasing hydraulic pressure in the cylinder. This allows the bridge to be raised at an initially high rate of speed and then slowed down near the end of travel at a near vertical position.
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Cited Art Landscape
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