Vehicle lift assembly and control system therefor
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United States of America Patent
Stats
-
Dec 30, 1980
Grant Date -
N/A
app pub date -
Nov 7, 1977
filing date -
Nov 7, 1977
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A vehicle lift having two hydraulically operated lifting cylinders for adjusting the height of a pair of weight supporting carriages, and having a control system featuring a cable strung between the carriages for responding, through changes in tension, to a change in relative vertical displacement between the carriages to actuate a levered valve assembly for controlling the rate of fluid being supplied to or from each lifting cylinder to eliminate the change and restore the preferred relative displacement between the carriages. The control system deactivates the lifts and effects engagement of safety latches to lock the carriages in place in their respective frames to limit misalignment thereof in the event of a control system malfunction. A fluid shuttle valve having a perforated cylinder which is both rotatable and translatable within the valve body to control fluid flow to and from each lifting cylinder is also featured.
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