Cantilever arm signal assembly

Details Cantilever arm signal assembly Cantilever arm signal assembly

1974-09-19

1976-04-27

Wood, Jr., M. H.

Railway switches and signals

Signals

Roadway, visual, and portable

246293, 340332, 246484, 238 10R, B61L 512

Patent

active

039529789

ABSTRACT:
A traffic crossing signal mast for railroad-highway grade crossings incorporates a sturdy cantilever arm extending over the highway and supporting a maintenance catwalk. A short, horizontal jury mast at the end of the cantilever arm is pivotable about its axis parallel to the highway direction through limited angular sectors of one-quarter turn clockwise and counterclockwise. A junction box assembly mounted at each end of the jury mast suspends a pair of warning flasher crossing signal lamps on each side of the catwalk aimed down the highway axis. Pivoting movement of the jury mast from its locked, detent position to a latched quarter-turned position raises one of each pair of signal lamps for initial cable connections, repairs or replacement of flashing lamp heads. A lockable clamping cam lever disengages the detent for jury mast rotation and re-engages it to secure the signal lamps in their aligned position for use. A novel catwalk-and-frame assembly is provided for ease of fabrication, incorporating aluminium chord extrusion frame members with integral concave ledges for supporting catwalk panels of expanded metal or perforated plates.

REFERENCES:
patent: 1330528 (1920-02-01), Hall
patent: 1435807 (1922-11-01), Conley
patent: 1591399 (1926-07-01), Nickell
patent: 2097785 (1937-11-01), Field

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