초록 ▼

A wheelchair having a frame capable of supporting the occupant includes a plurality of wheels including two driving wheels. Left and right side levers are mounted on the wheelchair such that the tops of the levers can be moved back and forth reciprocally toward and away from the occupant of the whee

A wheelchair having a frame capable of supporting the occupant includes a plurality of wheels including two driving wheels. Left and right side levers are mounted on the wheelchair such that the tops of the levers can be moved back and forth reciprocally toward and away from the occupant of the wheelchair. When the levers are in a position towards the occupant of the wheelchair, they are in a neutral position and by pushing away from the occupant from the neutral position to a displaced position, a power stroke is performed. Movement of the levers in the reverse direction back toward the occupant constitutes a return stroke of the same. A power transfer mechanism includes a first and second ratchet operatively associated with each of the driving wheels. The first ratchet allows the driving wheel to free wheel at all times in a forward direction. The second ratchet allows the driving wheel to free wheel in both a forward and reverse direction whenever the lever associated with that wheel is in the neutral position, and as the lever is moved in the power stroke away from the occupant, the second ratchet transfers this movement through the first ratchet to rotate the driving wheel in the forward direction. The second ratchet transfers no movement to the first ratchet as the lever moves back toward the occupant in the return stroke.

대표청구항 ▼

An occupant propellable riding device which comprises: a frame capable of supporting said occupant; a plurality of wheels rotatably mounted on said frame; at least one of said wheels comprising a driving wheel; at least one movable means on said frame, at least a portion of said movable means recipr

An occupant propellable riding device which comprises: a frame capable of supporting said occupant; a plurality of wheels rotatably mounted on said frame; at least one of said wheels comprising a driving wheel; at least one movable means on said frame, at least a portion of said movable means reciprocally movable back and forth away from and towards the occupant from a neutral position towards said occupant to a displaced position positioned away from said occupant, said movable means movable in a power stroke wherein said movable means moves in the direction away from said neutral position and said occupant towards said displaced position and said movable means movable in a return stroke wherein said movable means moves in the direction from said displaced position back towards said neutral position and said occupant; at least one transfer means rotatably mounted on said frame in association with said driving wheel and said movable means; said transfer means including a first and a second ratchet means; said first ratchet means operatively associated with said driving wheel, said first racthet means allowing said driving wheel to free wheel in a forward direction of movement of said device; said second ratchet means operatively associated with said first ratchet means and said movable means, said second ratchet means allowing said driving wheel to free wheel in both said forward direction and the reverse direction when said movable means is in said neutral position and said second ratchet means, acting through said first ratchet means by engaging with said first ratching means rotating said driving wheel in said forward direction in response to said movable means moving in said power stroke and said second ratchet means disengaging with said first ratchet means when said movable means moves in said return stroke.