Heavy lift chair

Details Heavy lift chair Heavy lift chair

2006-08-15

2006-08-15

White, Rodney B. (Department: 3636)

Chairs and seats

Movable bottom

Tiltable

C297SDIG010

Reexamination Certificate

active

07090297

ABSTRACT:
A power-assisted heavy lift chair comprises a base assembly. A chair frame is supported on the base assembly. A lift mechanism communicates with the base assembly and the chair frame, and is operable to actuate the chair frame between first and second positions. A transformer provides electrical power to an electric motor. The electric motor provides rotational power to the lift mechanism at a first rate to lift and/or lower the chair frame. The electric motor draws current from the transformer according to a load upon the chair frame. The rate that the electric motor lifts and/or lowers the chair frame depends upon the voltage provided by the transformer. The transformer is operable to provide a generally constant voltage regardless of the current draw of the electric motor. Therefore, the electric motor lifts and/or lowers the chair at a constant rate independent of the load on the chair.

REFERENCES:
patent: 4126939 (1978-11-01), Pyne, Jr.
patent: 4850645 (1989-07-01), Crockett
patent: 5061010 (1991-10-01), LaPointe
patent: 5158074 (1992-10-01), Grellas
patent: 5163451 (1992-11-01), Grellas
patent: 5495811 (1996-03-01), Carson et al.
patent: 6000758 (1999-12-01), Schaffner et al.

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