Assembly for, and method of, detecting and signalling when an ob

Details Assembly for, and method of, detecting and signalling when an ob Assembly for, and method of, detecting and signalling when an ob

1994-02-14

1996-09-03

Swarthout, Brent A.

Communications: electrical

Condition responsive indicating system

Specific condition

340552, 340556, 340555, 3409081, 340331, G08B 2100

Patent

active

055527671

ABSTRACT:
An assembly for detecting and signalling when an object enters a work zone including a plurality of transmitter-sensor pairs serially connected along a section of the work zone perimeter for detecting when an object passes therethrough. Once an object is detected, an optical warning signal is activated. The optical warning signal includes a primary strobe and a plurality of relay strobes positioned throughout the work zone. The primary strobe flashes at a predetermined flash rate which is detected by a photoelectric sensor in a nearby relay strobe. The nearby relay strobe begins flashing at the predetermined flash rate thereby activating another relay strobe in close proximity. This cascading strobe effect saturates the work zone.

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patent: 5198799 (1993-03-01), Pascale
"Warning Signal For Highway Workers", SHRP Product Catalog, National Research Council, 1992, p. 7.

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