Roadway treadle switch assembly

G - Physics – 08 – G

Patent

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Details

G08G 1/04 (2006.01)

Patent

CA 2150141

A treadle switch assembly (10) includes at least one elongated treadle (12, 14) of a compressible, resilient material containing a hollow passageway (24) throughout its length. It also includes a photocell emitter (34) and collector (36) inserted into opposite ends of the passageway (24). When the treadle (12, 14) is compressed by a vehicle, the passageway (24) is mashed and closed to interrupt the radiation beam from the emitter (34) to the collector (36), whereby the collector (36) generates a signal indicative of the passage of the vehicle, which signal may be used to operate counter (70) or signal device. The passageway (24) may be formed with an oval or elliptical cross section to enhance closure of the passageway (24) to interrupt the radiation beam. In the alternative, the emitter (54) and collector (56) may be in a single unit (50) type disposed in one end of the treadle (12, 14) while a reflector (52) is disposed at the other end.

Interrupteur de trafic à pédale (10) comportant au moins une pédale allongée (12, 14) faite d'un matériau compressible et élastique et présentant un passage creux (24) sur toute sa longueur, une cellule photoémettrice (34) et un récepteur (36) placé à l'autre extrémité du passage (24). Lorsque la pédale est comprimée par un véhicule, le passage creux (24) est écrasé et obstrué, ce qui interrompt la transmission de lumière entre la cellule photoémettrice (34) et le récepteur (36), lequel émet alors un signal indiquant le passage d'un véhicule destiné à actionner un compteur (70) ou un dispositif de signalisation. Le passage (24) peut présenter une section ovale ou elliptique afin d'accroître sa faculté d'arrêt du faisceau de rayonnement. Dans une autre exécution, l'émetteur (54) et le récepteur (56) constituent une seule unité (50) placée à l'une des extrémités de la pédale (12, 14) tandis qu'un réflecteur est placé à l'autre extrémité.

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