Wheelchair suspension
First Claim
1. A wheelchair comprising:
- a frame member;
at least one pivoting assembly having;
a first linkage pivotally coupled to the frame member; and
a second linkage pivotally coupled to the frame member;
a drive assembly coupled to the first linkage;
at least one rear caster; and
a third linkage coupled to the first and second linkages wherein upward pivotal movement of the first linkage causes the third linkage to undergo upward movement and upward pivotal movement of the second linkage causes the third linkage to undergo lateral movement toward the drive assembly.
6 Assignments
0 Petitions
Accused Products
Abstract
The present invention has a plurality of pivoting linkages to lift and retract a front castor assembly to facilitate traversing an obstacle or rough terrain. In this regard, a wheelchair suspension having a frame member and at least one a pivoting assembly is provided. The pivoting assembly has, for example, a first linkage pivotally coupled to the frame member and a second linkage pivotally coupled to the frame member. At least one front caster assembly is coupled to the first and second linkages wherein upward pivotal movement of the first linkage causes the caster assembly to undergo upward vertical movement and upward pivotal movement of the second linkage causes the caster assembly to undergo lateral movement inward toward the wheelchair.
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Citations
28 Claims
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1. A wheelchair comprising:
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a frame member; at least one pivoting assembly having; a first linkage pivotally coupled to the frame member; and a second linkage pivotally coupled to the frame member; a drive assembly coupled to the first linkage; at least one rear caster; and a third linkage coupled to the first and second linkages wherein upward pivotal movement of the first linkage causes the third linkage to undergo upward movement and upward pivotal movement of the second linkage causes the third linkage to undergo lateral movement toward the drive assembly. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A wheelchair comprising:
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a frame member; a pivoting assembly having; a first linkage pivotally coupled to the frame member, the first linkage comprising a drive assembly mount; and a second linkage pivotally coupled to the frame member; a drive assembly attached to the first linkage drive assembly mount; at least one rear caster; and at least one front caster assembly comprising a head tube, the front caster assembly head tube coupled to one of the first or second linkages wherein upward pivotal movement of the first linkage causes the front caster assembly head tube to undergo upward movement and upward pivotal movement of the second linkage causes the front caster assembly head tube to undergo lateral movement. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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21. A wheelchair comprising:
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a frame member; a pivoting assembly having; a first linkage pivotally coupled to the frame, the first linkage comprising a drive assembly mount; and a second linkage pivotally coupled to the frame; a drive assembly attached to the first linkage drive assembly mount; at least one rear caster; and at least one front caster assembly coupled to one of the first or second linkages wherein upward pivotal movement of one of the first or second linkages causes upward pivotal movement of the other of the first or second linkages and causes the front caster assembly to undergo upward movement. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28)
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Specification