Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1996-11-13
1999-09-14
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
2502221, G01D 534
Patent
active
059526483
ABSTRACT:
A linear operating mechanism for a slotted optical switch 10 which produces a guaranteed OFF-point for a consistent linear displacement of a switch operator 58 with respect to a reference surface 66 of the device enclosure 62. The guaranteed OFF-point is consistently repeatable from one device to another. The device enclosure 62 defines an integrally formed support for receiving an emitter 14 and a receiver 18 of the slotted optical switch 10. The enclosure 62 further defines a fixed Off-plane 114 immediately adjacent the receiver 18 and precisely located with respect to a reference surface 66 on an outside surface of the enclosure 62. The switch operator 58 is received within the optical switch slot and has a distal end 86 extending outside the enclosure 62 a precise distance with respect to the reference surface 66 when the operator is in a normally biased first position. A window 74 defined by the operator at a predetermined position with respect to its distal end 84 determines the normal state of the optical switch 10 and changes that state as the operator 58 is linearly moved to a second position in response to an external force applied to its distal end 86. One edge 78/82 of the window 74 further defines a movable OFF-plane 78/82 located at a precise distance from the distal end 86. The guaranteed OFF-point is obtained when a predetermined linear displacement of the operator 58 with respect to the reference surface 66 permits the movable OFF-plane 78/82 to coincide with the fixed OFF-plane 114 thereby prohibiting light from reaching the receiver 18.
REFERENCES:
patent: 4429219 (1984-01-01), Yochum et al.
Golden Larry I.
Pyo Kevin
Shrout Larry T.
Square D Company
Stacey David R.
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