Patent ID: 6494799
Filing Date: 2002-12-17
Classification: F16D,F16H

Abstract:
A power transmission device comprising a driving rotary member, a driven rotary member fixed to one end of a rotary shaft of a driven device, a first intermediate friction member disposed between the driving rotary member and the driven rotary member to be movable toward the rotary shaft, and a spring for pressing the driving rotary member against the first intermediate friction member, thereby pressing the first intermediate friction member against the driven rotary member, wherein the driving rotary member is provided with at least one first concave segment, the driven rotary member is provided with at least one convex segment and at least one second concave segment, and the first intermediate friction member is provided with at least one lug which engages the at least one first concave segment and simultaneously abuts the at least one convex segment, wherein when a torque applied to the driving rotary member exceeds a predetermined torque the at least one lug slips off the at least one convex segment disengages from the at least one first concave segment, and engages the at least one second concave segment.