Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1984-03-27
1987-02-17
Rowland, James L.
Communications: electrical
Condition responsive indicating system
Specific condition
182112, G08B 1318
Patent
active
046443290
ABSTRACT:
A workmen protecting safety light for roof perimeter edge protection includes a pair of invisible light beam units, one bearing a light beam source and the other being a light beam receiver/control, and a relay box together with audio warning and signalling apparatus. Supporting structure includes a base support frame, a sub-base, tripod support, vertically and horizontally adjustable support pipes and clamping structures. All the foregoing are combined to provide an easily, quickly and accurately installed perimeter safety light protection device. A plurality of specially sized and marked pipes, support brackets for the light units, and specific adjusting/clamping structures are all important features of the invention. Preferably, the units are supplied in kit form and, therefore, suitable containers are provided for holding same in compact, easily shippable and stored form, ready for quick and easy assembly at a job site.
REFERENCES:
patent: 2999290 (1961-09-01), Giles
patent: 3217833 (1965-11-01), Smith
patent: 3881698 (1975-05-01), Marsh
patent: 4171032 (1979-10-01), Woodslayer et al.
patent: 4186388 (1980-01-01), Robinson
patent: 4408195 (1983-10-01), Tullis et al.
Butler Manufacturing Company
Hofsass Jeffery A.
Rowland James L.
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