Adjustable linkage mechanism

Claim 1

LINKAGE MECHANISM COMPRISING: A DRIVING MEMBER MOVABLE IN A PLANE OF REVOLUTION AROUND A FIRST AXIS, A DRIVEN MEMBER MOVABLE IN A PLANE OF OSCILLATION ON A SECOND AXIS PARALLEL TO THE FIRST AXIS, A SHAFT CARRIED BY THE DRIVEN MEMBER AND ROTATABLE ON AN AXIS PARALLEL TO SAID FIRST AND SECOND AXES, SAID SHAFT EXTENDING OUTWARDLY FROM OPPOSITE SIDES OF THE DRIVEN MEMBER AND BEING MOVABLE AXIALLY ALONG ITS OWN AXIS, A CRANK FIXED ON ONE END OF THE SHAFT, A PIVOTAL CONNECTION BETWEEN SAID CRANK AND THE DRIVING MEMBER, A PIN CARRIED BY THE CRANK AND EXTENDING LATERALLY THEREFROM TOWARD SAID DRIVEM MEMBER ON AN AXIS PARALLEL TO THE OTHER AXES, SAID DRIVEN MEMBER HAVING A SERIES OF SOCKET HOLES THEREIN COMPLEMENTAL TO THE PIN AND SPACED APART ON THE CIRCUMFERENCE OF A CIRCLE CENTERED ON THE AXIS OF SAID SHAFT, HANDLE MEANS FIXES ON THE OTHER END OF THE SHAFT AND OPERATIVE TO MOVE THE SHAFT AXIALLY IN ONE DIRECTION TO SEAT SAID PIN IN A REGISTERING ONE OF THE SOCKET HOLES AND IN AN OPPOSITE DIRECTION TO DISENGAGE IT ENTIRELY FROM THE HOLE, SAID HANDLE MEANS BEING ROTATABLE WHILE THE PIN IS DISENGAGED WHEREBY TO ROTATE THE SHAFT AND IT CRANK TO SHIFT SAID PIN SELECTIVELY INTO REGISTRY WITH ANOTHER ONE OF THE SOCKET HOLES, AND SAID PIN WHILE SEATED IN A SOCKET HOLE CONSTITUTING A PIVOTAL CONNECTION BETWEEN SAID CRANK AND THE DRIVEN MEMBER AND PROHIBITING ANGULAR SHIFTING OF THE PIVOTAL CONNECTION BODILY RELATIVE TO THE DRIVEN MEMBER.