Treadle and roadway treadle assembly

Details Treadle and roadway treadle assembly Treadle and roadway treadle assembly

1994-10-26

1997-07-08

Hofsass, Jeffery

Communications: electrical

Vehicle detectors

With pneumatic

340664, 340665, 340666, 200 86R, G08G 102

Patent

active

056466153

ABSTRACT:
An optical treadle of extended longevity is disclosed. The treadle is of unitary construction with an improved cross-sectional passageway shape that more effectively interrupts light when a vehicle tire passes thereover. A treadle assembly with permanently affixed light transmitting and light receiving means is also provided such that a failed assembly can be quickly replaced as a unit. Further, a roadway treadle assembly comprising a frame for installation in a roadway and an adapter plate for adapting a preexisting treadle frame are provided for mounting the treadle assembly across a surface portion of a roadway.

REFERENCES:
patent: 2761928 (1956-10-01), Bicooper et al.
patent: 2885508 (1959-05-01), Wilcox
patent: 4245219 (1981-01-01), Dempsey et al.
patent: 4443700 (1984-04-01), Macedo et al.
patent: 4455465 (1984-06-01), Habeger
patent: 4830461 (1989-05-01), Ishiharada et al.
patent: 4839480 (1989-06-01), Bickley
patent: 4963705 (1990-10-01), Broderick et al.
patent: 5250769 (1993-10-01), Moore

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