Clutch type piston locking means

Claim 1

IN A DOUBLE ACTING CYLINDER IN WHICH THE PAIR OF PORTS ARE LOCATED AT OPPOSITE ENDS OF THE CYLINDER RESPECTIVELY TO SERVE ALTERNATELY AS INLET AND OUTLET PORTS FOR ACTUATING FLUID DELIVERED INTO THE CYLINDER THROUGH THE INTERMEDIARY OF A SUITABLE MASTER CONTROL VALVE, A PISTON ASSEMBLY HAVING AN AUTOMATIC CLUTCH-TYPE BRAKE, SAID PISTON ASSEMBLY INCLUDING A PISTON MAIN MEMBER, SAID MAIN MEMBER HAVING AN OPEN TRANSVERSE SLOT EXTENDING ACORSS SAID MAIN MEMBER, THE BOTTOM OF SAID SLOT EXTENDING IN A PLANE OBLIQUE TO THE LONGITUDINAL CENTER LINE OF THE CYLINDER AND OF SAID PISTON MAIN MEMBER SO AS TO HAVE A LOW SIDE OF GREATER DEPTH AND A HIGH SIDE OF LESS DEPTH, A CLUTCH ROLLER IN SAID SLOT OF PROPER SIZE TO HAVE CLUTCHING ENGAGEMENT WITH THE CYLINDER WALL WHEN SAID ROLLER MOVES FROM THE LOW SIDE TOWARDS THE HIGH SIDE OF SAID SLOT BOTTOM, SAID PISTON MAIN MEMBER HAVING A SECOND SLOT EXTENDING IN LONGITUDINAL DIRECTION INTO SAID MAIN MEMBER FROM THE END OF SAID MAIN MEMBER NEAREST THE HIGH SIDE OF SAID FIRST MENTIONED SLOT BOTTOM AND TRAVERSING SAID FIRST MENTIONED SLOT, A CLUTCH CONTROL BAR SLIDABLE IN SAID SECOND SLOT, MEANS ON SAID CONTROL BAR ENGAGING SAID CLUTCH ROLLER SO AS TO CAUSE MOVEMENT OF SAID CLUTCH ROLLER IN SAID FIRST MENTIONED SLOT WHEN SAID CONTROL BAR IS MOVED IN SAID PISTON MAIN MEMBER, A SECONDARY PISTON MEMBER LOCATED BEYOND SAID END OF SAID PISTON MAIN MEMBER, SAID CONTROL BAR SECURED TO SAID SECONDARY PISTON MEMBER LOCATED BEYOND SAID END OF POSED BETWEEN SAID PISTON MAIN MEDMBER AND SAID SECONDARY PISTON MEMBER AND NORMALLY ACTING TO CAUSE SAID CONTROL BAR TO PULL SAID CLUTCH ROLLER TOWARD SAID HIGH SIDE OF SAID FIRST MENTIONED SLOT BOTTOM, WHEREBY SAID CLUTCH ROLLER AND CONTROL BAR AND SPRING MEANS WILL ACT TO PREVENT TRAVEL OF SAID PISTON ASSEMBLY IN THE CYLINDER IN ONE DIRECTION EXCEPT WHEN THE ACTUATING FLUID IN SAID CYLINDER THRUSTS SAID SECONDARY PISTON CLOSER TO SAID PISTON MAIN MEMBER AGAINST THE FORCE OF SAID SPRING MEANS, THEREBY AUTOMATICALLY CAUSING SAID CLUTCH ROLLER TO BE MOVED BY SAID CONTROL BAR INTO RELEASING POSITION.