Wheelchair lift platform having internal gas spring deployment f

Material or article handling – Self-loading or unloading vehicles – Loading or unloading by other carrier or mover means – and...

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Details

414917, 414921, B60P 144

Patent

active

060659246

ABSTRACT:
Improvement in wheelchair lifts generally of the dual hydraulic parallelogram type employing a lever arm assembly which assists in the rotation of the platform from the stowed position to the horizontal deployed position, by providing a gas spring disposed in the lever arm assembly connected at an outboard end to the lifting mechanism link and at an inboard end to at least one of the A arm, the B arm or the common pivot pin of the lever arm assembly. The outward force of the gas spring causes the sliding shoe of the lever arm assembly to maintain contact with the outer face of the lower link of the lifting parallelogram so that upon deployment of the lift during the gravity down phase from stowed position to horizontal transfer position, the inboard end of the platform is pulled up so that it rotates smoothly and is not subjected to free fall. This lever arm follower force member can be used alone or in conjunction with a deployment assist gas spring disposed in the lifting parallelogram, alone or in combination with "reverse" type torsion springs disposed in one or more of the common pivot in the lever arm assembly or a pivot in the lifting assembly.

REFERENCES:
patent: 4534450 (1985-08-01), Savaria
patent: 4808056 (1989-02-01), Oshima
patent: 5261779 (1993-11-01), Goodrich
patent: 5605431 (1997-02-01), Saucier et al.
patent: 5806632 (1998-09-01), Budd et al.
patent: 5944473 (1999-08-01), Saucier et al.

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