Mechanism for absorbing elongation of a wire

摘要

A mechanism for absorbing elongation of a wire in a power transmission device comprising two coaxial pulleys, i.e., ratchet pulley and winding pulley, winding both end portions of the wire respectively in the opposite direction; a ratchet roller connecting with the ratchet pulley by means of ratchet and engaging to the winding pulley, whereby the elongation of the wire can be absorbed by winding only one end portion of the elongated wire around either the ratchet pulley or the winding pulley.