Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1984-09-14
1986-12-02
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
73705, G01D 534
Patent
active
046266810
ABSTRACT:
A differential pressure control apparatus includes a switch responsive to a pneumatic differential pressure for signaling the actuation of a blower motor. A signal generating section is provided and controls the speed of a blower for regulating the differential pressure. This section includes first means for sensing a projected light beam and second means for modulating the light beam. The first means and the second means are positionably displaceable one to the other in response to the magnitude of the differential pressure. Two preferred embodiments are disclosed.
REFERENCES:
patent: 3308303 (1967-03-01), Weichselbaum et al.
patent: 3898454 (1975-08-01), Friday et al.
patent: 4220836 (1980-09-01), Hersey
patent: 4289963 (1981-09-01), Everett
patent: 4464963 (1984-08-01), McIntire et al.
Hayes Thomas E.
Jamieson J. Scott
Spence Scott L.
Jochman, Jr. Joseph J.
Johnson Service Company
Nelms David C.
Oen William L.
Ryan John P.
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