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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.
In the above graphic, the four segments of the chain are labelled W, X, Y and Z. The magnitudes of their corresponding forces are F W, F X, F Y and F Z, respectively.. Assuming that the chain is massless, F X = 0 because segment X is not supporting any weight.
Cranes provide less flexibility in movement than industrial trucks because they only can operate within a restricted area, though some can operate on a portable base. Most cranes utilize trolley-and-tracks for horizontal movement and hoists for vertical movement, although manipulators can be used if precise positioning of the load is required.
Hydraulic Drum Lifter is a stand-alone piece of drum handling equipment that uses a wheeled trolley combined with a vertical lifting mast and drum gripping system. Often operated by a hydraulic pump with manual user pedal input or an electric motor. An example product is the VanMate. Below-hook drum handler is commonly used to lift, tilt and ...
A team of riggers design and install the lifting or rolling equipment needed to raise, roll, slide or lift objects such as heavy machinery, structural components, building materials, or large-scale fixtures with a crane, hoist or block and tackle. Rigging comes from rig, to set up or prepare.
These improvements can include reconfiguring the task and using positioning equipment like lift/tilt/turn tables, hoists, balancers, and manipulators to reduce reaching and bending. [13] The NIOSH (National Institute for Occupational Safety and Health) 1991 Revised Lifting Equation [14] can be used to evaluate manual lifting tasks. Under ideal ...