Patent ID: 6685171
Filing Date: 2004-02-03
Classification: B66D

Abstract:
A lifting device for raising and lowering an object by means of a rope and pulley, said device comprising frame means for attachment to a support, a cam cleat mounted on the support, said cam cleat comprising a rotatable pawl, a rope engaging surface on said pawl, a u-shaped member attached to the frame means opposite the rope engaging surface of the pawl, said u-shaped member containing said pawl and a rope passing therebetween, a rotatable pulley mounted on the frame spaced from said pawl and u-shaped member, a rope passing around the pulley and led between the pawl and the u-shaped member, an arm attached to said pawl and extending away from said pulley, said rope passing over said arm and being engageable therewith, said arm and said pawl being movable under force of the rope between a rope locking and rope release position with the u-shaped member, spring means acting of said pawl to urge the pawl toward the rope locking position, movement of the rope under tension with said arm causing movement of the pawl in a release position, said spring means acting to automatically return said pawl to a locked position upon release of tension on said rope, thereby providing a safety feature.