Wheelchair with an improved adjustable backrest

Chairs and seats – Movable back – Tiltable

Patent

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Details

297DIG4, 29735412, B60N 202

Patent

active

052637689

ABSTRACT:
A wheelchair comprises a backrest, a base frame and a rod assembly connecting the backrest with the base frame. The rod assembly includes at both sides of the backrest a support rod pivotably coupled with the base frame for adjusting the angle of inclination of the backrest. A locking mechanism is provided for locking the backrest in a desired position. For each support rod a pair of tubes is provided having an inner tube telescopically slidable in an outer tube. The free ends of the pair of tubes are rotatably connected with upper and lower supports, respectively, which supports are connected fixedly and rotatably, respectively, with the corresponding support rod. A gas spring is mounted in each outer tube, which gas spring is connected with the inner tube at one side and with the outer tube at the other side. The actuating pin of the gas spring is operable through an actuating lever pivotably supported at its free end in the outer tube.

REFERENCES:
patent: 3185495 (1965-05-01), Pivacek
patent: 3427073 (1969-02-01), Downs et al.
patent: 4787673 (1988-11-01), Locher
patent: 5011175 (1991-04-01), Nicholson et al.
patent: 5181762 (1993-01-01), Beumer

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