الفهرس 
HISTORY OF ELEVATOR AND DRIVEOnly 14 pages are availabe for public view
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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 .