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US 4,736,960 AGranted
Folding wheelchairs
AssigneeRemploy Limited
InventorsDavid O. Batty, David F. Brady, Joseph W. N. Wilson
Life of this patent
Estimating the term…
Abstract
A folding wheelchair includes a pair of side frames which are collapsible in their own planes. There is simultaneous collapse of two pairs of strut members. The collapsed wheelchair is very compact, even though the erected wheelchair is very reliable due, at least in part, to its avoidance of areas of high stress concentration. In alternatives, the scissor-like strut members are replaced by fixed struts so that collapse in the height direction is not accompanied by collapse in the width direction.
Claims16
A folding wheelchair, comprising:
- a pair of side frames, each having a portion carrying part of a seat and a portion carrying a pair of wheels, and each including a series of members which are pivotally secured together in a manner permitting said side frames to be collapsible in their own planes to move the seat carrying portions of said side frame towards the wheel carrying portions of said side frames, wherein each of said series of members comprises:
- a seat rail secured to an edge part of said seat;
- a backrest rail secured to an edge part of a back and pivotally secured to the rear of said seat rail;
- a lower frame unit secured to at least a front one of said pair of wheels;
- a front support unit pivotally secured at one end to the front of said lower frame unit, and at its other end to the front of said seat rail;
- a back support unit pivotally secured at one end to the rear of said lower frame unit, and at its other end to the loewr end of said backrest rail below the location at which said backrest rail is pivotally secured to said seat rail;
- and a connecting link pivotally secured at one end to the pivotal connection of said front support unit to said seat rail, and at its other end to said back support unit below the location at which said back support unit is pivotally secured to said backrest rail.
4 more elements
Dependencies are inferred from the claim text.