Abstract: A segmented rope guide formed of sectors encircles the drum of a hoist to guide a rope being wound onto or unwound from a helical rope groove on the drum and press the rope into the rope groove. The sectors have U-shaped interior portions facing inward toward the drum. A slot with inward converging side walls extends through one of the sectors to facilitate passage of the rope therethrough. A plurality of rollers are rotatably mounted in circumferentially spaced relation on axles transversely mounted in the U-shaped portions. The rollers include disc-shaped drum engaging elements that roll in the rope groove, and rope engaging elements having disc-shaped portions received in grooves between adjacent turns of rope with inwardly curved surfaces on each outer side of the disc-shaped portion that roll on the outer surfaces of the adjacent turns of rope.

Abstract: A high pressure hydraulic pump output compensator which utilizes a free-floating piston in a closed cylinder forming a lower and an upper chamber. One end of the cylinder is connected to the input of a hydraulic pump operating in excess of 1,000 psi. The lower chamber further includes a hydraulic input and an output port. Compressed air is provided to the free-floating piston at the opposite end of the chamber which exerts a force downwardly on the free-floating piston. The output pressure from the hydraulic pump compresses the air within the cylinder until such time as the compressed air and water pressure are equalized. As the output from the hydraulic pump drops during its working cylinder, the compressed air forces the piston downward to maintain the hydraulic output pressure.