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US 5,727,809 AGranted
Collapsible wheelchair
OwnerHendrik Jan Ordelman, Gerhard Temmink +2inventors
InventorsHendrik Jan Ordelman, Gerhard Temmink, Herman Willem Hendrik Stokkers, Harm Hendrik Braam
Life of this patent
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Abstract
A collapsible wheelchair having a frame including a first side frame, a second side frame, coupling means holding the two side frames at least on the operative situation in the same positions at a mutual distance, wheel arranged on the frame, a seat and a back.
Claims25
A collapsible wheelchair comprising:
- a frame comprising:
- a first side frame;
- a second side frame substantially the same as the first side frame;
- coupling means holding the two said side frames at a mutual distance in at least an operative situation;
- wheels arranged on the frame;
- a seat;
- a seat back;
- and
- wherein each side frame comprises:
- a first middle sub-frame which in the operative situation extends substantially horizontally, at substantially a level of the seat;
- a front sub-frame which in the operative situation extends from a front side of the first middle sub-frame inclining downwardly in a forward direction and bears a front wheel;
- a rear sub-frame which in the operative situation extends from a rear side of the first middle sub-frame and bears a rear wheel, wherein the front and rear sub-frames are pivotable relative to the first middle sub-frame by respective hinge joints and the coupling means are configured as spacers holding corresponding sub-frames at a fixed distance;
- a second middle sub-frame arranged between the front and rear sub-frames for pivoting relative to both these sub-frames by a hinge joint such that each side frame, and thus the whole frame, is foldable around pivot axes until the front, first middle and rear sub-frames lie substantially on top of each other;
- and
- stop means located between the middle sub-frame and at least one of the other sub-frames.
12 more elements
A wheelchair comprising:
- a frame;
- a plurality of wheels rotatably secured to said frame;
- and
- a seat secured to said frame, said frame comprising:
- a first member;
- a second member pivotally secured to said first member;
- a third member pivotally secured to said second member;
- a fourth member pivotally secured to said first member and said third member;
- a stop secured to said frame;
- and
- a locking member secured to said frame, whereby said frame is adapted to collapse in a first position when said first member is moved toward said third member so that portions of at least three of said members are positioned above one another without collapsing said seat, and whereby said frame is adapted to open into a second position when said first member is moved away from said third member, said stopping member preventing further movement of said frame members relative to each other and said locking member automatically engaging when said frame members are in said second position so that said frame cannot be collapsed unless said locking member is disengaged.
8 more elements
Dependencies are inferred from the claim text.