A bow stop including a Vee portion having a front, bow engaging concave surface and rear surface. The bow stop further having a connection portion for connection to a trailer. The Vee portion has a rigid body or chassis (hereinafter body) and a polymer cover, and the polymer cover overlies a front, Vee-shaped surface of the body. The connection portion is configured for positioning between a pair of spaced apart and generally parallel upstanding arms of a bow stop support structure of a boat trailer and the connection portion includes a connector for connection to the upstanding arms.

An electric stair lift system for transporting people and/or cargo up and down a flight of stairs includes a pair of parallel rails, a platform that is slidably engaged with the rails, an electric winch with a take-up spool, and pair of straps attached between the slidable platform and the take-up spool of the winch. In a preferred embodiment, the electric stair lift system is portable, so that it may be installed in such a way that it may be easily removed, stored and transported, as desired.

An electric stair lift system for transporting people and/or cargo up and down a flight of stairs includes a pair of parallel rails, a platform that is slidably engaged with the rails, an electric winch with a take-up spool, and pair of straps attached between the slidable platform and the take-up spool of the winch. In a preferred embodiment, the electric stair lift system is portable, so that it may be installed in such a way that it may be easily removed, stored and transported, as desired.

An electric stair lift system for transporting people and/or cargo up and down a flight of stairs includes a pair of parallel rails, a platform that is slidably engaged with the rails, an electric winch with a take-up spool, and pair of straps attached between the slidable platform and the take-up spool of the winch. In a preferred embodiment, the electric stair lift system is portable, so that it may be installed in such a way that it may be easily removed, stored and transported, as desired.

Apparatuses for controlling payload descent are described herein. For example, in one embodiment, a puck is provided that includes a top planar surface, a bottom planar surface opposite the top planar surface and an inner peripheral surface that is substantially perpendicular to the top planar surface and the bottom planar surface. The inner peripheral surface, the top planar surface and the bottom planar surface define a centrally located bore that is substantially perpendicular to the top planar surface and the bottom planar surface. Puck teeth are located on the inner peripheral surface. An outer peripheral surface bounds the top planar surface and the bottom planar surface. An exit port surface is substantially perpendicular to the top planar surface and the bottom planar surface. The exit port surface is between the inner peripheral surface and the outer peripheral surface and couples the top planar surface to the bottom planar surface.

Disclosed is a pulley assembly in a roped access system including first and second plates and a sheave carried for rotation about an axis normal to the plates. An aperture passes through each plate parallel to the axis. The plates have a closed condition when the apertures are coaxial with one another and the plates are in contact near the apertures, forming a rope passage extending between the plates adjacent the sheave, having an upper part smaller than parts of the passage below that upper part. A roped access system includes a climbing rope passing through the rope passage and a tether connected to the climbing rope above the pulley assembly by a friction hitch and an aperture of the pulley assembly, the hitch. The hitch grips the rope upon downward force to the tether, releasing its grip upon upward force to the friction hitch by pulley assembly plates.

A cable-driven device, such as a joint or instrument of a computer-assisted manipulator system, may comprise a capstan mechanism to wind/unwind cables. The capstan mechanism comprises a capstan that has a groove in an outer surface of the capstan to guide the cables, which are routed from a take-up pulley, to spool onto the capstan as the capstan rotates. A guide element is engaged with the groove. The guide element is held translationally stationary relative to the take-up pulley, while there is relative translation between the capstan and both the guide element and the take-up pulley. Thus, as the capstan rotates, the guide element engages with the groove and forces the capstan and the take-up pulley to translate relative to one another. This relative translation of the capstan and the take-up pulley may prevent deviation of a take-up angle of the cable as the cable spools onto the capstan.

This disclosure relates to an endless cable winch including a drive unit having an engine configured to generate a torque. The endless cable winch further including an output unit connected to the drive unit, the output unit including a power transmission assembly coupled to the drive unit, the power transmission assembly configured to apply a driving force to a cable. The endless cable winch further including a lifting force limiting device configured to stop the drive unit as soon a predetermined driving force is exceeded. In doing so, this system is also transferable to winches with multiple engines. The engine and the output unit can be movable relative to one another, and the lifting force limiting device can be configured to stop the drive unit based on the relative movement of the drive unit and the engine.

An ascender includes a pulley, an input shaft, a support member, a transmission mechanism, a rope guide, a cam, an energizing member, an operating member, and a closing member. A rope is removably wound on the pulley. An output shaft of a rotary electric tool is removably connected to the input shaft. The transmission mechanism transmit a rotational force of the input shaft to the pulley. The cam moves toward the pulley to bite into the rope so as to prevent a movement of the rope when the rope is going to move in a descending direction. The cam moves away from the pulley to allow the movement of the rope when the rope is going to move in an ascending direction.

A bow stop 20 including a Vee portion 25 having a front, bow engaging concave surface 26 and rear surface 27. The bow stop 20 further having a connection portion 28 for connection to a trailer 11. The Vee portion 25 has a rigid body or chassis (hereinafter body) 70 and a polymer cover 71, and the polymer cover overlies a front, Vee-shaped surface of the body 70. The connection portion 28 is configured for positioning between a pair of spaced apart and generally parallel upstanding arms 36 of a bow stop support structure 17 of a boat trailer 11 and the connection portion 28 includes a connector 38 for connection to the upstanding arms 36.