Protective grating

Details Protective grating Protective grating

1984-02-01

1986-04-29

Rowland, James L.

Communications: electrical

Condition responsive indicating system

Specific condition

340555, 250221, 350 9629, G08B 1318

Patent

active

045860300

ABSTRACT:
There is provided a protective grating which consists of tube-shaped grating rods disposed parallel to one another and grating rods disposed parallel to one another and at right angles to the tube-shaped grating rods. On respective opposite ends of the tube-shaped grating rods are disposed light sources and light receivers, so that light passes from the light sources through the hollow space of the tube-shaped grating rods to the light receivers. During interruption of the light beam an alarm is triggered.

REFERENCES:
patent: 3183499 (1965-05-01), Cowen
patent: 4275294 (1981-06-01), Davidson
patent: 4399430 (1983-08-01), Kitchen
patent: 4450434 (1984-05-01), Nielsen et al.
patent: 4488040 (1984-12-01), Rowe

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