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The actuator is a chain and pinion device that forms an articulated telescoping member to transmit traction and thrust. High-capacity rigid chain lifting columns can move dynamic loads exceeding 10 tonnes (22,000 lb) over more than 7 metres (23 ft) of travel. [1]
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.
Modern jacking systems use a rack and pinion gear arrangement [7] where the pinion gears are driven by hydraulic or electric motors and the rack is affixed to the legs. [citation needed] Jackup rigs can only be placed in relatively shallow waters, generally less than 120 metres (390 ft) of water.
Hoist atop an elevator. A hoist is a device used for lifting or lowering a load by means of a drum or lift-wheel around which rope or chain wraps. It may be manually operated, electrically or pneumatically driven and may use chain, fiber or wire rope as its lifting medium.
A rack lift is a type of elevator which consists of a cage attached to vertical rails affixed to the walls of a tower or shaft and which is propelled up and down by means of an electric motor which drives a pinion gear that engages a rack gear which is also attached to the wall between the rails.
In many cases, such as remote controlled toys, the pinion is also the drive gear for a reduction in speed, since electric motors operate at higher speed and lower torque than desirable at the wheels. However the reverse is true in watches, where gear trains commence with a high-torque, low-speed spring and terminate in the fast-and-weak escapement.
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Rigging is the equipment such as wire rope, turnbuckles, clevis, jacks used with cranes and other lifting equipment [1] in material handling and structure relocation. Rigging systems commonly include shackles, master links and slings, and lifting bags in underwater lifting.
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