Electrically operated lifting devices.
Adds mechanical advantage to manually operated doors. Couples to one end of the solid torsion shaft. (Commercial door application)
A mechanical device to assist in raising and lowering the door by use of hand chain and gear or sprocket reduction.
a device which has so much mechanical advantage, that using one, one person can easily lift a truck engine out of its compartment
a mechanical device used for lifting heavy loads of objects and equipment
A mechanical operator using a continuous hand chain and gear reduction to lift grille or closure.
An electric chain hoist used for lifting scenery, trusses and speaker clusters. They usually require a 3 phase supply and are controlled by a dedicated distro. They normally come in capacities ranging from 0.5Ton to 2Ton. Major manufacturers are CM Lodestar, Verlinde and Chainmaster. Sometimes fitted with encoders or magnetic sensors to allow repeatable movement. Fixed speeds (although some modern hoists can be run varispeed from invertors) of 16 and 32 feet / minute. Submitted by Piers from London, UK.
an electrically powered, remote controlled winch-type device which uses chain to pull the load rather than steel wire. Originally used on building sites with the motor at the highest point and the load being pulled up. Modified versions are now used in th e entertainments industry in a 'chain climbing' mode. The hoist is fixed to the truss at ground level, and the end of the chain fixed to a point in the ceiling. The motor then 'climbs' the chain.
A lifting device comprised of an electric motor and gear/chain drive system. Chain hoists are commonly used to lift portable trusses into place for touring concerts and shows. See Also: Truss
Hoist used to manually operate a garage door. Used mainly for 3-metre-high doors. Shorter doors can be opened with a nylon rope or a pull chain.
Hoist that uses gearing to mechanically lift a load. The gearing is attached to a drum, which has a hook and chain attached. After the load is hooked by the chain, the drum is turned by the gearing, which winds the chain onto the drum, lifting the load.