Weight responsive knee lock for artificial leg

Claim 1

IN AN ARTIFICIAL LEG THE COMBINATION OF AN UPPER PORTION ADAPTED TO BE ATTACHED TO THE TIGH OF A WEARER AND HAVING ELONGATED SLOTS EXTENDING LENGTHWISE OF SAID UPPER LEG PORTION, A LOWER LEG PORTION HAVING EARS AT SPACED POSITIONS AND ARRANGED TO BE ADJACENT SAID ELONGATED SLOTS, A SPINDLE EXTENDING THROUGH SAID SLOTS AND FIXEDLY SECURED AT ITS ENDS WITH SAID EARS, SAID SPINDLE BEING FREE TO MOVE BODILY LENGTHWISE OF SAID SLOTS BETWEEN OPPOSED POSITIONS IN RESPONSE TO APPLICATION OF THE WEARER''S WEIGHT ON THE LEG AND LIFTING OF THE UPPER PORTION OF THE LEG, SPACED MEANS ON EACH SIDE OF SAID UPPER PORTION FOR LIMITING THE MOVEMENT OF SAID SPINDLE BETWEEN SAID OPPOSED POSITIONS, A GEAR SEGMENT ON SAID SPINDLE AND BODILY MOVABLE THEREWITH, SAID GEAR SEGMENT BEING WHOLLY DISPOSED WITHIN SAID UPPER LEG PORTION, DETENT MEANS DISPOSED WHOLLY WITHIN SAID UPPER LEG PORTION, AND SPRING-BIASED MEANS DISPOSED WITHIN SAID UPPER LEG PORION FOR MOUNTING SAID DETENT MEANS IN SAID UPPER LEG PORTION TO BE ENGAGEABLE WITH SAID GEAR SEGMENT WITH SAID SPINDLE IS IN ONE POSITION AND DISENGAGED FROM SAID GEAR SEGMENT WHEN THE SPINDLE IS IN ITS OTHER POSITION.