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Abstract An elevator or lift is a device for vertical transportation of passengers or freight to different floors or levels, as in a building or a mine. The term elevator generally denotes a unit with automatic safety devices; the very earliest units were called hoists. Elevators consist of a platform or car traveling in vertical guides in a shaft or hoist way, with related hoisting and lowering mechanisms and a source of power. there are three categories of lifts, passenger lifts are designed primarily for passenger use; goods lifts are mainly for goods but can on occasion carry passengers ;and service lifts are for goods only and are of such a size that passengers cannot enter into the car . |