Removably attachable watt-hour meter monitor device

Details Removably attachable watt-hour meter monitor device Removably attachable watt-hour meter monitor device

1978-03-30

1980-05-20

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250231SE, 324175, 340201P, G01D 534, G02B 516

Patent

active

042041155

ABSTRACT:
Affixed to or positioned opposite the glass housing of a watt-hour meter which has a rotating disc with an indicator mark on its periphery is a device for indicating the rate of rotation of the disc. The device has two spherical lenses disposed generally in the plane of the disc along a line which is generally perpendicular to a radius of the disc and preferably symmetrically positioned on opposite sides of the radius. A first fibre optical cable couples visible light from an incandescent source to the first spherical lens to focus light on the periphery of the disc and a second fibre optical cable couples visible light collected by the second spherical lens focused on the periphery of the disc to a photoresistor.

REFERENCES:
patent: 1878658 (1932-09-01), Aronoff
patent: 2566868 (1951-09-01), Allia
patent: 3950075 (1976-04-01), Cook et al.
"Electronic Tachometer", Electronic Industries, Mar. 1945, vol. 4, No. 3, pp. 80, 81 and 208.

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