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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 drum hoist (steel wire rope visible) and motor. In underground mining a hoist or winder [1] is used to raise and lower conveyances within the mine shaft.Modern hoists are normally powered using electric motors, historically with direct current drives utilizing Ward Leonard control machines and later solid-state converters (), although modern large hoists use alternating current drives that ...
Three winches, controlled by joystick, are necessary to operate the Hallen derrick: two for the guys and one for the purchase. Limit switches are used to avoid an over-topping or over-swinging. However, the limits can be modified if a different working range or a special vertical stowage is required.
Portable winch, used in the Albert Dock, Liverpool. Many dockyards used small portable jiggers mounted on wheeled carriages. These could be moved around the quays as needed, and plumbed into outlets in the hydraulic mains with screwed pipe unions. They were used as portable winches for all manner of tasks. A typical task would be winching bales ...
The craft would be capable of staying airborne for long periods of time, with an estimated endurance of 41 days. At low altitudes, the jets would burn conventional aviation fuel. In order to take off, the plane required 182 additional vertical lift engines. These were similar to the engines from the Boeing 747, which was new at the time.
This is a vertical spool with a ratchet mechanism similar to a conventional winch, but with no crank handle or other form of drive. [7] The line is wrapped around the spool and can be tightened or reeled in by pulling the tail line. The winch takes the load once the pull is stopped with little operator tension needed to hold it.