Elevating apparatus having an offset upper boom maintaining a workstation level on a cantilevered angularly movable support that retracts into a compact position
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United States of America Patent
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Sep 4, 1990
Grant Date -
N/A
app pub date -
Mar 31, 1989
filing date -
Mar 31, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The invention provides an elevating apparatus for raising and lowering a work station holding personnel, equipment, and/or materials between a downward declining, compact retracted position and an upwardly inclining extended limit position. The work station is connected to a mobile support base by parallelogram first and second boom assemblies which are operatively interconnected by a boom assembly coupler and rigid compression link. Thus, raising or lowering the first boom assembly by hydraulic lift means causes the second boom assembly to move correspondingly such that the work station moves vertically, unaccompanied by any substantial horizontal motion, and is maintained in a level attitude throughout the range of motion of the apparatus.
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