Wheelchair suspension
First Claim
Patent Images
1. A wheelchair comprising:
- a frame;
a front caster assembly comprising a pivot arm that is pivotally coupled to the frame;
a drive assembly that is pivotally coupled to the frame;
an interface between the caster assembly and the drive assembly that engages and disengages based on relative movement between the drive assembly and the front caster assembly comprising;
at least one inwardly curved surface; and
at least one outwardly curved surface disposed substantially opposite the at least one inwardly curved surface.
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Abstract
The present invention provides a suspension for a conveyance that is capable of traversing obstacles and rough terrain. The suspension includes a frame, a pivot arm, a front caster, a drive assembly and a rear caster. The pivot arm and the drive assembly are coupled and decoupled based on movement of the drive assembly.
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Citations
25 Claims
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1. A wheelchair comprising:
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a frame; a front caster assembly comprising a pivot arm that is pivotally coupled to the frame; a drive assembly that is pivotally coupled to the frame; an interface between the caster assembly and the drive assembly that engages and disengages based on relative movement between the drive assembly and the front caster assembly comprising; at least one inwardly curved surface; and at least one outwardly curved surface disposed substantially opposite the at least one inwardly curved surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A wheelchair comprising:
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a frame; a front caster assembly comprising a pivot arm that is pivotally coupled to the frame; a drive assembly that is pivotally coupled to the frame; an interface between the caster assembly and the drive assembly that engages and disengages based on relative movement between the drive assembly and the front caster assembly comprising; at least one concave surface; and at least one convex surface, the convex surface and the concave surface being moveable between a first position where the concave surface receives the convex surface to a second position where the concave surface and the convex surface are spaced apart. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A wheelchair comprising:
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a frame; a front caster assembly comprising a pivot arm that is pivotally coupled to the frame; a drive assembly that is pivotally coupled to the frame; an interface between the caster assembly and the drive assembly that engages and disengages based on relative movement between the drive assembly and the front caster assembly comprising; a first surface that is undulating in character; and a second surface, the first surface and the second surface being moveable between a first position where the undulating surface at least partially receives the second surface to a second position where at least a portion of the first surface and the second surface are spaced apart. - View Dependent Claims (18, 19, 20)
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21. A wheelchair suspension comprising:
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a frame; a pivot arm pivotally coupled to the frame; a front caster coupled to the pivot arm; a drive assembly that is pivotally coupled to the frame; a rear caster coupled to the frame; an interface comprising a drive assembly interface surface and a pivot arm interface surface that are coupled such that movement of the drive assembly in a first direction decouples the drive assembly interface surface from the pivot arm interface surface and movement of the drive assembly in a second direction couples the drive assembly interface surface to the pivot arm interface surface. - View Dependent Claims (22, 23, 24, 25)
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Specification