Rail wheel locking mechanism

Claim 1

A HYDRAULIC PISTON-CYLINDER CONSTRUCTION HAVING MECHANICAL LOCKING MEANS, SAID CONSTRUCTION COMPRISING A CYLINDER HAVING A GROOVE IN THE INTERNAL WALL THEREOF, A HOLLOW PISTON SLIDABLE IN SAID CYLINDER, A PISTON ROD CONNECTED TO SAID PISTON AND EXTENDING OUT OF ONE END OF SAID CYLINDER, A CONNECTING MEMBER ON THE FREE END OF SAID PISTON ROD HAVING A DIAMETER LARGER THAN THAT OF THE PISTON ROD, THE GROOVE IN SAID CYLINDER WALL BEING ADJACENT THE END OF THE CYLINDER THROUGH WHICH SAID PISTON ROD EXTENDS, SAID PISTON HAVING A PLURALITY OF RADIAL BORES THEREIN, A LOCKING MEMBER SLIDABLE IN EACH BORE, A LOCKING BALL IN EACH OF SAID BORES AT THE RADIALLY INNER END OF SAID LOCKING MEMBER IN THE BORE CUP MEMBER SLIDABLE INSIDE OF SAID PISTON, THE OUTER SIDE WALL OF SAID CUP HAVING A DEEP GROOVE AND A SHALLOW GROOVE ADJACENT SAID DEEP GROOVE, SPRING MEANS IN SAID CUP AND ADAPTED TO COOPERATE WITH SAID PISTON ROD FOR URGING SAID CUP IN A DIRECTION SUCH THAT THE DEEP GROOVE IS REMOTE FROM SAID LOCKING BALLS, A COLLAR ADAPTED TO PARTIALLY SURROUND SAID PISTON ROD, SAID COLLAR BEING SUBSTANTIALLY THE SAME LENGTH WHICH SAID PISTON ROD EXTENDS FROM SAID CYLINDER IN THE FULLY WITHDRAWN POSITION WITH THE LOCKING MEMBERS IN SAID GROOVE IN SAID CYLINDER WALL, A SHAFT ROTATABLY MOUNTED ON SAID CYLINDER ON WHICH SAID COLLAR IS MOUNTED FOR SWINGING MOVEMENT TOWARD AND AWAY FROM SAID PISTON ROD LATERALLY OF SAID ROD, A COLLAR ACTUATING PISTON-CYLINDER MEANS CONNECTED TO SAID CYLINDER AND ACTUATED SIMULTANEOUSLY AS SAID PISTON IS MOVED ALONG SAID CYLINDER TO MOVE THE PISTON ROD OUT OF THE CYLINDER, SAID SHAFT BEING ARTICULATED TO SAID PISTON CYLINDER MEANS AND ROTATED BY SAID PISTON-CYLINDER MEANS.