Abstract: A positive engagement clutch has a torque input side and a torque output side. The clutch comprises a torque input member arranged on the torque input side, a torque output member arranged on the torque output side, first engagement members, second engagement members, and an actuator. The torque input member and the torque output member are arranged concentrically to rotate on a common axis. One of the torque input member and the torque output member carries the first engagement members, and the other of the torque input member and the torque output member carries the second engagement members. The first engagement members are radially movable by the actuator between a projecting and a retracted position, and the second engagement members project radially into a gap between the torque input member and the torque output member.

Abstract: A rotary coupling comprises a driving part, a drivable part, a fixed part in which the driving and drivable parts are each rotatable coaxially, and a set of coupling members carried by one of the driving and drivable parts for torque-transmitting engagement with the other. The coupling members are selectively positionably arranged so that, in a first condition, the coupling members are juxtaposed to a primary annular contact surface of either the fixed part or the drivable part and, in a second condition, the coupling members are juxtaposed to a secondary annular contact surface of the driving part. Each coupling member is free to move relative to the driving and drivable parts into and out of engagement with the primary and secondary annular contact surfaces.

Abstract: A rotary coupling comprises a driving part, a driven part, and a fixed part in which the driving and driven parts are rotatable coaxially. Coupling units are provided to be in torque-transmitting engagement with driving and driven parts. Coupling units are juxtaposed to an annular braking surface of the fixed part, and are free to move into and out of engagement with the braking surface. Each coupling unit includes a wedging surface and a bearing surface. A driving torque, applied by the driving part to the coupling units, is transmittable to the driven part without engagement of the coupling units with the braking surface. A reverse torque, applied by the driven part to the coupling units, first moves the bearing surface into non-wedging engagement with the braking surface and then progressively moves the wedging surface into progressive wedging engagement with the braking surface.

Abstract: A positive engagement clutch has a torque input side and a torque output side. The clutch comprises a torque input member arranged on the torque input side, a torque output member arranged on the torque output side, first engagement members, second engagement members, and an actuator. The torque input member and the torque output member are arranged concentrically to rotate on a common axis. One of the torque input member and the torque output member carries the first engagement members, and the other of the torque input member and the torque output member carries the second engagement members. The first engagement members are radially movable by the actuator between a projecting and a retracted position, and the second engagement members project radially into a gap between the torque input member and the torque output member.

Abstract: A rotary coupling comprises a driving part, a drivable part, a fixed part in which the driving and drivable parts are each rotatable coaxially, and a set of coupling members carried by one of the driving and drivable parts for torque-transmitting engagement with the other. The coupling members are selectively positionably arranged so that, in a first condition, the coupling members are juxtaposed to a primary annular contact surface of either the fixed part or the drivable part and, in a second condition, the coupling members are juxtaposed to a secondary annular contact surface of the driving part. Each coupling member is free to move relative to the driving and drivable parts into and out of engagement with the primary and secondary annular contact surfaces.

Abstract: A rotary coupling comprises a driving part, a driven part, and a fixed part in which the driving and driven parts are rotatable coaxially. Coupling units, carried by the driving part and seated in recesses in the driven part, are provided to be in torque-transmitting engagement with driving and driven parts. Coupling units are juxtaposed to an annular braking surface 46 of the fixed part, and are free to move into and out of engagement with the braking surface. Each coupling unit includes a wedging surface and a bearing surface. A driving torque, applied by the driving part to the coupling units, is transmittable by the latter to the driven part without engagement of the coupling units with the braking surface; but a reverse torque, applied by the driven part to the coupling units, first moves the bearing surface into non-wedging engagement with the braking surface and then progressively moves the wedging surface into progressive wedging engagement with the braking surface.

Abstract: A rotary coupling comprises a driving part and a driven part, for transmission of driving torque between them; a fixed part in which the driving and driven parts are each rotatable coaxially; and a set of coupling members. The coupling members are carried by the driving part and are seated in recesses in the driven part so as to be in torque-transmitting engagement therewith. The coupling members are juxtaposed to an annular braking surface of the fixed part, and can independently move into and out of engagement with the braking surface. A driving torque, applied by the driving part to the coupling members, is transmitted by the latter to the driven part without the coupling members engaging the braking surface. A reverse torque, applied by the driven part to the coupling members, moves the latter into wedging engagement with the braking surface, locking up the coupling.

Abstract: A rotary coupling transmits normal driving torque from an input shaft to a rotary output member via a planet carrier ring which carries planetary coupling rollers. Radially inwards of the carrier ring, the rollers are in driving engagement with an output sleeve coupled to the output member. Reverse torque applied to the output member causes the rollers to tilt into wedging engagement against a fixed annular braking surface, thereby preventing the reverse torque from passing to the input side.