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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 car is either winched up to the station on the top of the incline where the cable is collected on a winch drum. Alternatively a car is balanced by a counterweight moving along the track in the opposite direction, quite similar to an ordinary lift. [3] [4] Unlike a standard elevator, it can go up tilted grades. It can be used for both ...
Examples vary from a ramp used to load goods into a truck, to a person walking up a pedestrian ramp, to an automobile or railroad train climbing a grade. [ 3 ] Moving an object up an inclined plane requires less force than lifting it straight up, at a cost of an increase in the distance moved. [ 4 ]
Leaning Tower of Pisa has used external counterweights to stabilize the once gradually falling structure. Elevator In traction (non-hydraulic) elevators, a heavy counterweight counterbalances the load of the elevator carriage, so the motor lifts much less of the carriage's weight (specifically, the counterweight is the weight of the carriage ...
To lift a load, a separate line runs up and over the mast with a hook on its free end, as with a crane. [ 1 ] [ 2 ] Derricks are especially useful for high-rise rigging, jobs that cover a long period of time, or jobs when the impact to street or pedestrian traffic is a concern. [ 3 ]
Torsion of a square section bar Example of torsion mechanics. In the field of solid mechanics, torsion is the twisting of an object due to an applied torque [1] [2].Torsion could be defined as strain [3] [4] or angular deformation [5], and is measured by the angle a chosen section is rotated from its equilibrium position [6].
Car lift may refer to: Car elevator, a device which transports cars between different floors of a building. Car lift, car hydraulic lift, 2 post lift or 2 column lift, a device which mechanically lifts a car up, so that the mechanic can work underneath. Car ramp, a device which raises a car from the ground for access to its undercarriage.
Variable valve lift (VVL) is an automotive piston engine technology which varies the height a valve opens in order to improve performance, fuel economy or emissions. There are two main types of VVL: discrete, which employs fixed valve lift amounts, and continuous, which is able to vary the amount of lift.
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