1976-11-26
1978-05-23
Frinks, Ronald L.
3 24, 3 25, A61F 104, A61F 108
Patent
active
040902641
ABSTRACT:
The invention relates to an artificial leg device including a double-jointed knee connection having a pair of tie arms pivotably connected to upper and lower support members and a pair of inner linkage arms pivotably connected to the upper and lower support members intermediate the tie arms. A gear drive assembly is connected between the upper and lower support members providing synchronous rotation therebetween. A ratchet coupling is connected to the gear drive assembly having a pivotable pawl member cooperating with a ratchet wheel to form a lock therebetween for locking the knee joint in a weight-supporting configuration. An operator assembly is carried by the lower support member for operating the pawl and includes an operator rod responsive to pressure on the foot, a resilient biasing means carried by the operator rod, and a quick-release mechanism carried adjacent the upper portion of the operator rod for releasing the resilient biasing means to provide quick and positive disengagement of the pawl from the ratchet.
REFERENCES:
patent: 47353 (1865-04-01), Burr
patent: 50770 (1865-10-01), Lockwood
patent: 2071711 (1937-02-01), Sprouls
patent: 2667644 (1954-02-01), Johnson
patent: 2749557 (1956-06-01), Riddle
patent: 3969773 (1976-07-01), Menschik
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