Electrical transmission or interconnection systems – Switching systems
Patent
1990-03-21
1992-11-10
Williams, Howard L.
Electrical transmission or interconnection systems
Switching systems
187130, 200314, 315 76, 315276, 315291, 34081513, B66B 114, B66B 300, H01H 916, H05B 3900
Patent
active
051626659
ABSTRACT:
A vibration-resistant elevator call button/annunciator assembly comprises: a switch housing defining an interior cavity and apertures opening into the cavity; a switch mounted in the housing; a switch actuating member movably disposed in the cavity; a resilient member for urging the actuating member into an unactuated position in the cavity; and, a light module for illuminating the actuating member mounted through a wall of the housing. The light module preferbly snap fits in an aperture in the housing, the wedge-based lamp being press fitted into a receptacle in the module. An electrical circuit for utilizing the modular assembly as an elevator call button/annunciator assembly comprises: a voltage stepdown transformer having a primary winding adapted for coupling to an AC mains supply and having a secondary winding for developing an output voltage at a first level; a switch coupled to the secondary winding; and, a lamp mounted in a switch housing and coupled to the switch for illuminating a call button/annunciator responsive to actuation of the switch, the lamp having a voltage rating greater than the first level. The switch may be actuated by engagement of the call button. The lamp may be a T-3 1/4 wedge-based lamp, having a voltage rating greater than the output voltage lelvel.
REFERENCES:
patent: 3774728 (1973-11-01), Metzler et al.
patent: 3875554 (1975-04-01), Booker, Jr. et al.
patent: 4126849 (1978-11-01), Mente et al.
patent: 4144477 (1979-03-01), Eaton
patent: 4447765 (1984-05-01), Cote
patent: 4506318 (1985-03-01), Nilssen
patent: 4725759 (1988-02-01), Tachikawa
patent: 4785916 (1988-11-01), Jaster
Sylvania/GTE, Lighting Handbook, 7th ed., 1984, p. 51.
Fried Harvey D.
Osborn David
Williams Howard L.
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