San Francisco : Architect and Engineer, Inc · leaf 446
ELECTRO-MECHANICAL DOOR LOCK, INTERLOCK OPEN AND DOOR HOOK IN POSITION OF ENTER- INC7 THE LOCK DOOR LOCK IN CLOSED POSITION—IN THIS POSI-TION DOOR IS FULLY CLOSED AND INTERLOCK ISALSO CLOSED ebruary, 1929 AUCHITLCT AND ENGINEER. 105 … CAR SAFETY DEVICE s always electrically released and spring:losed. Since it is good elevator practice toequire two magnetic switches, a directionalind a potential switch—for power to thenotor—it is also good practice to requirehat both of these switches be closed beforehe brake is released. This is…
Architecture · Building
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