Abstract: In an overload clutch for shutting off torque transmission when an overload is encountered in an driven part, a pressure member is formed with a tapered surface so that a ball may be held by the tapered surface, the outer surface of the driving member and the end surface of a ring member axially urged by a spring while torque is transmitted. An annular groove is formed on the outer surface of the driving member such that the ball falls into the groove when torque transmission is shut off due to an overload such that the urging force will not act on the pressure member. Restoration to the torque-transmitting operation may be effected by moving the pressure member in the reverse direction.

Abstract: An overload clutch in which torque transmitting elements are held within hollow portions formed in one of a hub member or a driven plate member and are urged by a pressure plate against recesses formed in the other of the hub member or driven plate member so that torque may be transmitted and the torque transmitting elements are adapted to escape from said V-shaped recesses in opposition to an urging force. The pressure plate is formed with an inclined section for pressing the torque transmitting elements in a direction which substantially intersects the rotational axis of the clutch. The hollow portions for holding the torque transmitting elements are generally V-shaped when viewed axially, and the recesses for holding the torque transmitting elements are grooves of V-shaped cross section.

Abstract: A tripping torque setting mechanism of an overload clutch having an adjusting nut threadedly engageable with a thread provided on a cylindrical part of a clutch hub, the adjusting nut being tightened against a spring to produce an urging force corresponding to a predetermined tripping torque. A helical line having a pitch coinciding with the pitch of said thread and indicia for indicating the angular positions is provided on one of the adjusting nut or a member which does not rotate relative to the nut, and an indicator is provided on the other. The axially adjacent portions of the helical line are indicated by different colors and the indicia for indicating the angular positions are indicated by the same color as the portion of the helical line to which the indicia correspond.