GB930705A - Traffic control signal assembly - Google Patents

Abstract

930,705. Pedestrian-crossing lighting arrangements. FOREST CITY SIGNS Ltd. March 23, 1962 [Nov. 10, 1961], No. 40306/61. Class 118. A pedestrian-controlled crossing signalling arrangement comprises vehicle warning lights VA1-VA3, vehicle stopping lights VR1-VR3 and pedestrian " cross " and " wait " lights PC, PW the arrangement including means for both pulsating (dim and bright) and flashing (on and off) the vehicle warning lights at high and low frequencies and for flashing the pedestrian " cross " light to warn pedestrians and traffic that the lights are about to change. The signalling phases are switched sequentially by stepping switches US1-US6 controlled via a relay US by a timing circuit including a thyratron V in the circuit of a relay X the contacts X1 X2 of which lie in the switch circuits. Operation. Position 1 of stepping switches corresponds to the period when vehicles have precedence, no lamps are illuminated, except on closure of switch P the " wait " light PW. Assuming switch P has been closed: Position 2 is still a " wait " period during which lamp PW is operative. Position 3.-The contact arm of US1 completes a circuit to motor driven flasher unit M having high- and low-frequency flashing contacts Mf, Mff respectively in the circuit of relay F. Contact Mf makes and breaks the circuit causing warning lamps VA1-VA3 to pulsate at higher frequency via contacts F2-F4 due to the positions of contacts D3-D5 and B1-B5 to warn traffic that it must stop if possible. The " wait " lamp PW is still illuminated. Position 4.-" Wait " lamp PW and warning lamps VA1-VA3 are extinguished and " cross " lamp PC lit via contact D2 due to de-energization of relay D. The vehicle stop lamps VR1- VR3 now pulsate at the higher frequency due to the return of contacts D2, D4' D5 to the positions shown. Pedestrians can now cross and traffic has to stop. Position 5.-Only relay F is energized at the lower frequency through contact Mff causing flashing of pedestrian cross lamp PC and of warning lamps VA1-VA3 via contacts B3-B5 and dimming resistance R. Position 6.-Warning lamps VA1-VA and lamp PC flash at the higher frequency to warn pedestrians and traffic that the traffic crossing period will soon start. Another timing device e.g. an electric, constant-speed motor may replace the one described and an electronic device, mercury switch delay device or " slugged " relay may replace the motor M. Pedestrian demand in position 1 is stored by the provision of a link N, the latter being removed if storage is not desired.