High/low extension-lift power wheelchair
First Claim
1. A wheelchair adapted to selectively position the rider in positions of varying height from the ground comprising:
- a main frame;
two drive wheels operably secured to said frame;
a seat operably secured to said main frame and adapted to be selectively raised or lowered;
an extension structure operably secured to said frame and adapted to selectively move relative to said main frame;
coupling means operably secured to said seat, to said main frame, and to said extension structure said coupling means adapted to extend said extension structure relative to said main frame when said seat is lowered and to draw said extension structure towards said main frame when said seat is raised;
a wheel operably secured to said extension structure, said wheel adapted to have selectively limited castering and adapted to support said wheelchair as a third point cooperating with said two drive wheels.
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Accused Products
Abstract
This invention relates to an improved wheelchair adapted to provide enhanced mobility for the occupant together with making ground level activities available. The wheelchair comprises a main frame together with an extension frame telescopically secured to said main frame. A seat is operably secured to the extension frame so that when the extension frame is moved away from the main frame, the seat is lowered, and when said extension frame is brought back to said main frame, the seat is raised. Means are provided for further enhancing stability in the form of a mechanism to selectively move the drive wheels apart for wider wheel tracking. A rear wheel castered to the extension frame is provided with a selectively operable torsion limiter.
65 Citations
17 Claims
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1. A wheelchair adapted to selectively position the rider in positions of varying height from the ground comprising:
- a main frame;
two drive wheels operably secured to said frame;
a seat operably secured to said main frame and adapted to be selectively raised or lowered;
an extension structure operably secured to said frame and adapted to selectively move relative to said main frame;
coupling means operably secured to said seat, to said main frame, and to said extension structure said coupling means adapted to extend said extension structure relative to said main frame when said seat is lowered and to draw said extension structure towards said main frame when said seat is raised;
a wheel operably secured to said extension structure, said wheel adapted to have selectively limited castering and adapted to support said wheelchair as a third point cooperating with said two drive wheels. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
- a main frame;
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12. A variable height wheelchair adapted to provide maximum stability, comfort and maneuverability for an occupant, said wheelchair comprising:
- a main housing;
an extension frame telescopically operably secured to said main housing;
drive means for propelling said wheelchair;
support means adapted to cooperate with said drive means to support said wheelchair;
a seat member operably secured to said main housing and adapted to seat the occupant of the wheelchair;
power means secured to said main housing for moving said extension frame relative to said main housing for raising and lowering said seat member relative to said main housing;
connecting means comprising a parallelogram linkage structure of two parallel links, pivotably secured to said main housing and to said seat member, and a link adapted to be operably secured to one of said parallel links and to said extension frame for selectively raising and lowering said seat member, said parallelogram linkage structure being adapted to extend said extension frame from said main housing when said seat member is lowered and to draw said extension toward said main housing when said seat is raised; and
, counterbalance means secured to said connecting means and adapted to compensate for the weight of the occupant of the wheelchair. - View Dependent Claims (13, 14, 15, 16, 17)
- a main housing;
Specification