Torque transmitting fluid coupling

Claim 1

A TORQUE TRANSMITTING DEVICE COMPRISING A FIRST ELEMENT, A SECOND ELEMENT SUPPORTED ON SAID FIRST ELEMENT AND ROTATABLE RELATIVE THERETO, SHEAR SURFACES CARRIED BY SAID FIRST AND SECOND ELEMENTS AND FORMING A DRIVE CHAMBER THEREBETWEEN, A FLUID RESERVOIR CHAMBER ADJACENT SAID DRIVE CHAMBER, PORT MEANS IN SAID SECOND ELEMENT PROVIDING FLUID COMMUNICATION BETWEEN SAID DRIVE AND RESERVOIR CHAMBERS, PUMP MEANS FOR TRANSFERRING FLUID FROM SAID DRIVE CHAMBER TO SAID RESERVOIR CHAMBER THROUGH SAID PORT MEANS DURING ROTATION OF SAID DEVICE, SAID PUMP MEANS COMPRISING A MOVABLE ABUTMENT MEMBER COOPERATING WITH SAID PORT MEANS, SAID ABUTMENT MEMBER BEING MOVABLE BETWEEN AN ACTIVE POSITION IN WHICH IT EXTENDS INTO THE PATH OF THE FLUID IN THE DRIVE CHAMBER AND RENDERS SAID PUMP MEANS OPERABLE TO TRANSFER FLUID AND AN INACTIVE POSITION WHEREIN IT IS WITHDRAWN FROM SAID FLUID PATH AND RENDERS SAID PUMP MEANS INOPERABLE TO TRANSFER FLUID, AND CONDITION RESPONSIVE MEANS FOR MOVING SAID ABUTMENT MEMBER BETWEEN ITS SAID POSITIONS.