PASSIVE RESTRAINT FOR PREVENTION OF UNCONTROLLED MOTION
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United States of America Patent
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Issued Date -
Jul 10, 2008
app pub date -
Jan 8, 2008
filing date -
Jan 9, 2007
priority date (Note) -
Abandoned
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Abstract
A passive energy absorbing strut for dynamic restraint includes a hydraulic cylinder, a hydraulic piston rod extending from the cylinder, a rod stem on the end of the rod and having a flange and a stop at opposite ends, a floating piston member sleeved on the stem between the flange and the stop, the piston member having fluid passages therethrough, and a piston spring urging the piston member away from the flange. The flange is sized to restrict the piston passages when the piston member engages the flange. The piston member is driven toward the flange in reaction to initiation of sudden extension of the strut, thereby restricting the piston passages and the flow of hydraulic fluid therethrough. The strut is connected between a piston and cylinder of a pneumatic vehicle end lift to damp sudden extension of the lift in response to loss of the load.
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