Hoist (device)

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 can be manually operated, electrically powered, or pneumatically driven. Hoists are primarily used in construction, manufacturing, and other industrial settings where heavy objects need to be moved vertically.

The fundamental components of a hoist typically include a frame to support the mechanism, a lifting medium (rope, wire rope, or chain), a drum or lift-wheel to wind the lifting medium, a motor or manual lever to provide the force, and a hook or other attachment point for the load. Safety features are often incorporated, such as overload protection and braking mechanisms to prevent uncontrolled descent of the load.

Different types of hoists exist, each suited for specific applications. Chain hoists are robust and commonly used for heavy lifting in workshops and factories. Wire rope hoists offer higher lifting speeds and are frequently found in cranes and elevators. Lever hoists, also known as come-alongs, are portable and manually operated, ideal for situations where power is unavailable.

The lifting capacity of a hoist is a critical parameter that must be carefully considered to ensure safe operation. Overloading a hoist can lead to equipment failure and potentially dangerous accidents. Regular inspection and maintenance are essential to ensure the hoist is in good working order and that all safety features are functioning correctly.