Improvements in signalling apparatus for regulating traffic at crossroads

摘要

477,739. Road signals for controlling traffic. COMPAGNIE POUR LA FABRICATION DES COMPTEURS & MATERIAL D'USINES A GAZ. Feb. 22, 1937, No. 5319. Convention date, Feb. 22, 1936. [Class 118 (ii)] Right of way is transferred to a route when, following a call from that route, the sum of the vehicles on the two routes reaches a predetermined adjustable figure. As shown, when a call is made from a blocked route, magnet 1 energizes, and locks the magnet tensioning spring 3. Magnet 10 is energized momentarily each time a vehicle passes the road detector in either route, each energization of mag. net 10 allowing disc 6 tc be moved one step by the spring 3 through the rack and pinion drive. When the predetermined number of steps have been made contacts 11 are bridged by member 12 to cause right of way to be transferred. The number of vehicles necessary to cause transfer is varied by altering the distance between contacts 11 and bridge piece 12. Instead of the mechanical counter described, the passage of vehicles may allow charging pulses to pass to a condenser, right of way being transferred when the condenser is charged.