Folding scissor frame wheel chair
OwnerWalter Lovell, Richard Lawrenceinventors
Life of this patent
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Abstract
A wheel chair having novel features for more comfort and easier operation by the occupant, with reference to the chain drive and tension adjustment therefor, a guard for the chain, a variable tension brake system, swing away foot rests, and swing away (and removable) arm rests, whereby the user can enter from the side of the chair.
Claims8
A wheel chair comprising a pair of generally parallel spaced vertical scissor frames extending fore and aft of the chair, a seat frame, a back rest frame, means for detachably connecting a portion of one of the scissor frames with respect to the seat frame to hold the scissor frames and the chair erect, said means being releasable to allow the scissor frames to fold into general parallelism with and in close association to the seat frame, and means pivotally mounting the back rest frame with respect to the seat frame to allow it to move into parallel relationship therewith,
- hand wheels rotatably mounted on the scissor frames adjacent the point of pivotal connections of said scissor frames,
- driving wheels rotatably mounted on one of said scissor frames, a chain connecting the wheels so that the hand wheels drive the driving wheels, the driving wheels being located at the rear of the chair and the hand wheel being intermediate of the ends of the frames and means to adjust the tension of the chain.
A wheel chair comprising a pair of scissor frames which are interpivoted, said scissor frames extending fore and aft of the chair and each including a forward cross member,
- a seat frame pivoted with respect to one of said scissor frames,
- a lock on said seat frame engagable with a portion of the other scissor frame at the forward cross member thereof,
- hand wheels rotatably mounted at the intersection of said scissor frames at either side of the wheel chair, sprockets on the hand wheels, a guard between each hand wheel and the chain,
- driving wheels mounted on the scissor frame having the locking engagement with said seat frame, sprockets on the driving wheels, and chains engaged with said sprockets,
- and means for adjusting the tension of said chain, said last named means including adjustable eccentric devices.
Dependencies are inferred from the claim text.