Hoists and balancers are attachments for bridge cranes and other material handling equipment that are used to lift heavy loads. Relatively simple in design, they provide stability and increased mobility and come in a wide range of capacities and can be used for a variety of purposes.
A hoist consists of a power source, a drive mechanism that turns a lift wheel or sprocket, and a length of chain or wire rope, known as the lift media. When power is supplied to the hoist, the drive mechanism turns the sprocket, which retrieves or extends the lift media. This, then, raises or lowers the payload. In most cases, the up and down functions are controlled by a hand-held pendant with buttons or levels for each direction.