Locking differential

Claim 1

A LOCKING DIFFERENTIAL POWER TRANSMISSION FOR USE WITH A POWER SOURCE COMPRISING A ROTATABLE CASE MEMBER ADAPTED TO HAVE FLUID THEREIN AND TO ROTATE ABOUT AN AXIS, A PAIR OF SIDE GEARS ROTATABLY DISPOSED IN SAID CASE MEMBER AND EACH ADAPTED TO BE AFFIXED TO A DIFFERENT ONE OF A PAIR OF DRIVEN SHAFTS, A SPIDER MEMBER IN SAID CASE MEMBER AND OPERATIVELY CONNECTED TO SAID CASE MEMBER SO THAT LIMITED RELATIVE ROTATIONAL MOVEMENT ABOUT SAID AXIS CAN OCCUR BETWEEN SAID MEMBER, A PLURALITY OF PINION GEARS ROTATABLY DISPOSED ON SAID SPIDER MEMBER, THE TEETH OF SAID PINION GEARS BEING IN MESH WITH THE TEETH OF SAID SIDE GEARS, CYLINDER MEANS WITHIN SAID CASE MEMBER AND INTEGRAL WITH ONE OF SAID MEMBERS, SAID CYLINDER MEANS BEING ADAPTED TO RECEIVE FLUID FROM SAID CASE MEMBER, PISTON MEANS DISPOSED IN SAID CYLINDER MEANS, MEANS COUPLED TO SAID PISTON MEANS AND ADAPTED TO BE COUPLED TO ONE OF SAID DRIVEN SHAFTS FOR RECIPROCATING SAID PISTON MEANS IN SAID CYLINDER MEANS WHEN SAID ONE SHAFT ROTATES RELATIVE TO SAID CASE MEMBER, VALVE MEANS ASSOCIATED WITH SAID CYLINDER MEANS ADAPTED FOR CONTROLLING FLOW OF SAID FLUID FROM SAID CYLINDER MEANS, AND VALVE ACTUATING MEANS OPERABLY CONNECTED BETWEEN SAID MEMBERS AND RESPONSIVE TO LIMITED RELATIVE ROTATIONAL MOVEMENT BETWEEN SAID MEMBERS FOR OPENING AND CLOSING SAID VALVE MEANS AT PRE-ESTABLISHED POSITIONS OF SAID ACTUATING MEANS SO THAT WHEN THE SAID MEMBERS HAVE MOVED TO ONE POSITION OF RELATIVE ROTATIONAL MOVEMENT THE VALVE MEANS WILL BE OPEN ALLOWING SAID PISTON MEANS TO RECIPROCATE AND THE SIDE GEARS TO ROTATE RELATIVE TO ONE ANOTHER, AND WHEN THE SAID MEMBERS HAVE MOVED TO ANOTHER POSITION OF RELATIVE ROTATIONAL MOVEMENT THE VALVE MEANS WILL BE CLOSED LOCKING FLUID IN SAID CYLINDER MEANS AND THEREBY PREVENTING RECIPROCATION OF SAID PISTON MEANS AND LOCKING SAID SIDE GEARS AGAINST RELATIVE ROTATION.