Joint lock control

Claim 1

IN A JOINT LOCK AND CONTROL FOR AN ARTIFICIAL LEG INCLUDING UPPER AND LOWER LEG MEMBERS, A VERTICAL MOUNT POSITIONABLE BETWEEN SAID MEMBERS, MEANS ADAPTED FOR PIVOTALLY ENGAGING THE UPPER END OF SAID MOUNT WITH THE UPPER MEMBER, MEANS ADAPTED FIXING THE LOWER END OF THE MOUNT TO THE LOWER MEMBER, A LATCH PIVOTALLY MOUNTED ON SAID MOUNT, MEANS ENGAGED BETWEEN SAID LATCH AND SAID MOUNT FOR RESILIENTLY BIASING SAID LATCH IN A FIRST LOCKING DIRECTION, A PRESSURE MEMBER PIVOTALLY MOUNTED RELATIVE TO SAID MOUNT, AN EXPANSIBLE MEMBER ENGAGED BETWEEN SAID MOUNT AND SAID PRESSURE MEMBER FOR EFFECTING, UPON AN EXPANSION THEREOF, AN OUTWARD PIVOTAL MOVEMENT OF SAID PRESSURE MEMBER, AND LINK MEANS ENGAGED BETWEEN SAID PRESSURE MEMBER AND SAID LATCH FOR MOVING SAID LATCH IN A SECOND RELEASING DIRECTION AGAINST THE BIASING FORCE IN RESPONSE TO AN OUTWARD PIVOTAL MOVEMENT OF SAID PRESSURE MEMBER.