Torque limiting clutch

A torque limiting clutch comprising first and second drive members mounted for rotation about an axis, a torque transmitting means, to transmit torque between said drive members up to a predetermined value, said torque transmitting means comprising a torque transmitting member carried by, and movable relative to, said first drive member between an operative position in which the torque transmitting member is in torque transmitting engagement with a torque transmitting abutment of said second drive member and an inoperative position in which the torque transmitting member is not in torque transmitting engagement with said abutment, connection means to act on said torque transmitting member with a biasing force applied to the connection means, by a main biasing means, to urge said torque transmitting member into said operative position and said torque transmitting member being displaced against said biasing force, when the torque exceeds said predetermined value, into said inoperative position and in which position the torque transmitting member is not acted upon by said biasing force and at least one expedient, independent of said connection means, for movement of the torque transmitting member between said operative and inoperative positions.