Artificial leg having a lockable knee joint

Details Artificial leg having a lockable knee joint Artificial leg having a lockable knee joint

1978-02-16

1979-12-25

Frinks, Ronald L.

3 25, 3 27, A61F 104, A61F 108

Patent

active

041797590

ABSTRACT:
The knee pivot or hinge shaft of the artificial limb connecting the upper limb portion and the lower portion is located forward of the center line of gravity in the prosthesis whereby the arc of the foot of the limb is shortened as the foot moves rearwardly from a straightened position of the limb. The knee joint is provided with a locking mechanism which is actuated to lock the upper limb portion to the lower limb portion either by downward pressure applied to the upper limb portion as the artificial limb rests on a support surface or by pressure applied to the heel portion of the foot as it engages a support surface. The actuating lever of the locking mechanism pivots about a first fulcrum to actuate the locking mechanism as pressure is initially applied to the heel of the foot during the amputees stride and, as the weight of the amputee is transferred from the heel to the ball or toe portion of the foot, the actuating lever pivots about a second fulcrum. The locking mechanism remains in the actuated or locked condition as the lock actuating lever moves from one fulcrum to the other.

REFERENCES:
patent: 1361062 (1920-12-01), Ingold
patent: 2127566 (1938-08-01), Malloy-Brehunoff
patent: 2170580 (1939-08-01), Steele et al.
patent: 2559017 (1951-02-01), Hanson
patent: 2599297 (1952-06-01), Touson
patent: 2671224 (1954-03-01), Regnell
patent: 2679650 (1954-06-01), Kleinekathofer
patent: 2830301 (1958-04-01), Schober
patent: 3453663 (1969-07-01), Minor

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