Implements or apparatus for applying pushing or pulling force – Multiple lifters
Patent
1989-10-05
1991-09-24
Watson, Robert C.
Implements or apparatus for applying pushing or pulling force
Multiple lifters
254 90, B66F 300
Patent
active
050508440
ABSTRACT:
A lift assembly adapted for large vehicles includes first and second lift platforms selectively raised and lowered relative to a base member. Fluid actuated support arms are interposed between the lift platforms and the base member to define a generally trapezoidal arrangement. Segmented bearings are interposed between opposite ends of the support arms and the lift platforms and base member to accommodate tolerance stackup. The lift assembly also includes a sensing assembly that determines if a height differential exists between the lift platforms. If a height differential is sensed, movement of one of the lift platforms is altered to correct the situation. If too great a differential is sensed, further movement of the platforms is terminated. A locking arrangement maintains the lift platforms elevated relative to the base member. A sensing arrangement determines whether the locking arrangement is properly oriented and whether the load is applied from the lift platforms. Lift jack assemblies are provided to selectively lift the vehicle relative to the lift platform. A multiplexing arrangement is provided to synchronize movement between the lift jack assemblies. Further, the lift jack assemblies may be comprised of single acting fluid cylinders that are retracted with a bidirectional pump.
REFERENCES:
patent: 3178156 (1965-04-01), Rigers
patent: 3317004 (1967-05-01), Harrison
patent: 4050673 (1977-09-01), Nishimura
patent: 4230304 (1980-10-01), Tol
patent: 4241901 (1980-12-01), Shircliffe
patent: 4251974 (1981-02-01), Vanderklaauw
patent: 4815712 (1989-03-01), Kawada
patent: 4848732 (1989-07-01), Rossato
VBM Corporation
Watson Robert C.
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