Horizontally supported planar surfaces – Vertically adjustable – Shelf type
Patent
1996-04-18
1997-11-18
Chen, Jose V.
Horizontally supported planar surfaces
Vertically adjustable
Shelf type
2481621, A47B 900
Patent
active
056876556
ABSTRACT:
A height adjustable load support structure has a base frame and a generally planar support surface. Preferably, two extendable vertical support assemblies support the surface for vertical movement relative to the base frame. Each support assembly is engaged by a spring biased pivotable arm to counterbalance the weight placed on the surface. A cam system cooperating between the distal ends of the pivotable arms and the support assemblies serves to compensate for the changing spring force on the arms by varying the effective moment arms of the arms thereby equalizing the force on each support assembly through its complete range of vertical travel.
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Machael Jay R.
Weinschenk, Jr. Lavern L.
Chen José V.
Hon Industries Inc.
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