Cyclopedia of applied electricity : a general reference work on direct-current generators and motors, storage batteries, electrochemistry, welding, electric wiring, meters, electric lighting, electric railways, power stations, switchboards, power transmission, alternating-current machinery, telegraphy, etc. (1916)
American Technical Society · Chicago : American Technical Society · leaf 272
cannot be startedagain until that door is closed. To prevent opening the elevatordoor when the car is not at the landing, a lock is provided which isreleased only when the car itself reaches the landing; this is accom-plished by having a small cam on the car, which closes a switch, thusactuating a… … Fig. 142. Wiring Diagram of Five-Floor Automatic Push-Button Controller for D. C. MotorCourtesy of Kaestner and Hecht Company call buttons are on the right and the circuits leading to the car con-troller are clearly shown. Up and Down Control. The up and down control of thepush-button elevator, the…
Electrical engineering
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