Abstract: The secondary overspeed assembly for a cable climber or hoist is provided that includes an overspeed sensor assembly. The sensor assembly consists of a bar with a pair of members or weights whose movement is restricted by a spring member, and wherein these weights can move outward only at an overspeed condition.

Abstract: A cable climber safety lock is provided that includes a sensing device. The safety lock is installed above and attached to a cable climber, and the safety lock can also be attached to other types of hoists. The safety lock gradually locks onto the cable as the climber accelerates beyond a predetermined speed down the cable and the unit also senses any climber movement on the cable after power is shut off.

Abstract: A hand winch for scaffolds including a pair of cable drums for separately winding a pair of cables used for simultaneously raising one end of a scaffold. A shaft carrying a spur gear is fixed to the winch frame and the cable drums are journalled on the fixed shaft. A planet gear carrier is secured to the cable drums and rotates therewith with one gear of each pair of planet gears meshing with the spur gear. A hand crank is journalled in the frame and on the fixed shaft and carries a member with an internal spur gear thereon which meshes with the other of the pair of planet gears so that the drive provides a 161/2 to 1 mechanical advantage.

Abstract: A load limiter is provided for a lift hoist wherein the upper portion is fastened to the lift hoist and the lower portion is fastened to a load. A micro-switch is mounted on the upper half and actuated by movement of the lower half and is provided with an adjustment screw that can be adjusted to vary the load which will break a circuit of the lift hoist. The micro-switch is used in series with an operating switch to shut off the hoist motor when the load limit is reached to prevent damage to equipment or injury to personnel.