Abstract: A reversible unidirectional clutch of the hyperboloidal type having an inner race whose surface approximates a hyperboloidal, and an outer race formed of a super derivative forming a volume therebetween for disposition of thurst transmitting rollers. The engagement direction of which may be reversed with reversing the skew of the thurst transmitting rollers allowing rotation of the inner and outer race in both directions or, selectively, in either one direction or the other, or capable of freewheeling each race in both directions.

Abstract: A positive axial clutch of the hyperboloidal type whereupon engagement transmits torque in one direction and freewheel or overrun is allowed when disengaged. The apparatus utilizes an inner race coupled to an inner race element such as a shaft, an outer race member coupled to an outer race element such as a sprocket designed to rotate in one direction relative to the shaft with an annular volume formed therebetween in which a plurality of thrust transmitting rollers are disposed.

Abstract: A unidirectional clutch of the hyperboloidal type is provided having an inner race member defining an inner race surface, an outer race member defining an outer race surface and a plurality of thrust transmitting cylindrical rollers therebetween. Each of the rollers makes line contact with the inner race surface and line contact with the outer race surface along generators of these surfaces. A biasing member is provided for biasing the inner and outer race surfaces axially toward one another to maintain the rollers in line contact with both inner and outer race surfaces. The inner race member is connected to a driven member and the outer race member is connected to a driving member. Torque is transmitted between the driven and driving members causing the biasing member to impose a net axial force on the inner race member tending to urge the inner and outer race surfaces toward one another axially.