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A rack and pinion has roughly the same purpose as a worm gear with a rack replacing the gear, in that both convert torque to linear force. However the rack and pinion generally provides higher linear speed — since a full turn of the pinion displaces the rack by an amount equal to the pinion's pitch circle whereas a full rotation of the worm screw only displaces the rack by one tooth width.
Heavy-duty descenders such as rappel racks are used for greater control and friction when carrying heavy loads or in very wet or icy conditions (e.g. big wall climbing and caving). The modern technique is to use a descender with a Personal Anchor System .
Attempts have been made to increase the safety of bridges with pin and hanger assemblies by adding some form of redundancy to the assembly. Retrofits that add redundancy to pin and hanger assemblies include adding a "catcher's mitt"—a short steel beam attached to the bottom of the cantilevered girder that extends out beneath the suspended girder to "catch" the suspended girder should ...
A leadscrew (or lead screw), also known as a power screw [1] or translation screw, [2] is a screw used as a linkage in a machine, to translate turning motion into linear motion. Because of the large area of sliding contact between their male and female members, screw threads have larger frictional energy losses compared to other linkages.
Rigid chain actuators function as rack and pinion linear actuators that use articulated racks. Rigid chain actuators use limited-articulation chains, usually resembling a roller chain, that engage with pinions mounted on a drive shaft within a housing. The links of the actuating member, the “rigid chain”, are articulated in a manner that ...
A traditional climbing rack on a harness A rack A whale tail (rack) 1. Name given to the collective set of protection equipment carried by a lead climber up a climb. [1] [2] 2. A type of heavy-duty "all-weather" descender known as an "abseil rack" or a "rappel rack", consisting of metal bars on a U-shaped chassis, which is frequently used in ...