. Material handling cyclopedia; a reference book covering definitions, descriptions, illustrations and methods of use of material handling machines employed in industry . ffice. ElectricDrive forElevators Modern freight elevator serv-: ice owes its smooth acceleration,\ speed, and convenience to itsI electrical equipment. The nicetyi I of elevator control is due di-rectly to the adaptability ofelectric power to this class of service. In warehouseand factory installations it is sometimes desiralale tocontrol the movement of a car from the various button control furnished for such wo
. Material handling cyclopedia; a reference book covering definitions, descriptions, illustrations and methods of use of material handling machines employed in industry . ffice. ElectricDrive forElevators Modern freight elevator serv-: ice owes its smooth acceleration,\ speed, and convenience to itsI electrical equipment. The nicetyi I of elevator control is due di-rectly to the adaptability ofelectric power to this class of service. In warehouseand factory installations it is sometimes desiralale tocontrol the movement of a car from the various button control furnished for such work obviatesthe necessity of an operator. Ordinarily the safety brake operating on a largedrum directly connected to the driving motor shaft isspring applied. This brake is released by the passageof current through an electric magnet and is reset theinstant the current ceases to ilow, which insures pro-tection against accident in case of failure of General Electric Company has developed bothconstant speed and variable speed motors for elevatorservice, using either direct current or 3-phase or single-phase alternating current. Various types of single speed. G-E Motor Driving Freight Elevator. GENERAL ELECTRIC COMPANY, SCHENECTADY, N. Y. Address nearest office. For list of offices see page 706. 709 ELECTRICAL EQUIPMENT FOR INDUSTRIAL TRUCKS elevator motors manufactured by this company are de-scribed briefly on page 71,i. For information on 2-^peed elevator motors it will be necessary to communi-cate with the comjjanys general office. Two main types of control are used; semi-magneticin which reversing is accomplished by a mechanicallyoperated drum type reversing switch, and full-magnetin which reversing is accomplished by directional con-tactors from a car switch installed in the elevator semi-magnetic control cannot be used on elevatorsat speeds above 100 feet per minute, according rules. G-E Motors for Trucks and Tractors Electrically driven industr
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Keywords: ., bo, bookcentury1900, bookdecade1920, booksubjecthoistingmachinery
