Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1975-07-03
1976-11-02
La Roche, Eugene
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250231R, 250237R, 250578, 317127, 350275, G01D 534
Patent
active
039899438
ABSTRACT:
A selectively aligned optical switching device including two adjacent translucent discs having mask segments formed on the surfaces thereof, with the first disc including a sleeve extending from the central opening thereof which is received within the central opening of the second disc. A clamping nut threadably engages the sleeve to selectively align the masking segments of the discs relative to each other. This combination of discs is clamped in concentric alignment against a timing hub which in turn is indexed by a pin relative to a rotary shaft. The mask section of the discs is then received in an optical coupling device which provides operating signals in selected coordination with the rotation of the shaft.
REFERENCES:
patent: 1880105 (1932-09-01), Reifel
patent: 2420013 (1947-05-01), Rajchman
patent: 3111841 (1963-11-01), Gray
patent: 3195405 (1965-07-01), Clark et al.
patent: 3683294 (1972-08-01), Gaa
Campbell John E.
Harley Douglas A.
Juhasz John E.
Lee Herbert S.
Babcock William C.
La Roche Eugene
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