Land vehicles – Wheeled – Occupant propelled type
Patent
1983-11-04
1985-10-08
Peters, Jr., Joseph F.
Land vehicles
Wheeled
Occupant propelled type
280250, 297DIG4, B62M 114
Patent
active
045455937
ABSTRACT:
Enhanced mobility wheelchair is disclosed. A seat and frame supporting the seat includes a base portion and a seat supporting portion maintained in a space relationship by a plurality of spacing numbers. A pair of back rest supporting members extend from the rear base portion of the frame upward past the seat supporting portion and have a back rest supported therebetween. A pair of right and left rear wheels are independently and rotatably mounted on opposite sides of the frame near the base portion thereof and a pair of right and left front wheels are independently and rotatably mounted near the base portion of the frame at the front thereof. Each wheel includes a coaxially mounted sprocket and the same sided wheels are connected with an endless chain over the sprockets to cause the wheels to turn in unison. The front and rear wheels are sized to permit a user to propel the wheelchair from the rear wheels when in an upright normal position and from the front wheels when in a forward leaning position in either case by grasping and turning the wheels. By leaning backward the user may shift the center of gravity of the wheelchair backwards to momentarily disengage the front wheels and rotate the wheelchair about the rear wheels. Optionally the wheelchair may be fitted with a pair of castor wheels to support the rear thereof with the rear wheels off the ground to provide improved maneuverability when operating the wheelchair on hard and flat surfaces and to raise the user to a more conventional wheelchair height.
REFERENCES:
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patent: 2436619 (1948-02-01), Swindell
patent: 2751027 (1956-06-01), McLaughlin
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patent: 3848883 (1974-11-01), Breacain
patent: 4077483 (1978-03-01), Randolph
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patent: 4209073 (1980-06-01), Enix
patent: 4258815 (1981-03-01), Wier et al.
patent: 4375295 (1983-03-01), Volin
Peters Jr. Joseph F.
Watts Charles R.
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