Electricity: motive power systems – Positional servo systems – With protective or reliability increasing features
Patent
1986-06-02
1987-12-08
Roskoski, Bernard
Electricity: motive power systems
Positional servo systems
With protective or reliability increasing features
318565, 315 93, 315 88, 340656, H05B 3910, G05B 902
Patent
active
047120517
ABSTRACT:
This adapter has a housing containing an automatic electrical switching circuit, a plug for connecting the circuit to an external A.C. power source, and sockets for mounting primary and standby lamps on the housing in circuit with the switching circuit. The circuit includes a conventional rectifier bridge and a transistor which is normally biased off so that the standby lamp is off, when the primary lamp lights. When the primary lamp goes off (burns out), the transistor conducts and the standby lamp is automatically turned on. When the primary lamp again operates the transistor is again biased off and the standby lamp is automatically turned off. A signal lamp in the switch circuit lights when the standby lamp is on. Motors or other power consuming devices may be substituted for the lamps.
REFERENCES:
patent: 3562580 (1971-02-01), Blomgren
patent: 3790846 (1974-02-01), Morris
patent: 3809917 (1974-05-01), Vore
patent: 3883777 (1975-05-01), Morita
patent: 4034259 (1977-07-01), Schock
patent: 4061911 (1977-12-01), Krasin
patent: 4127854 (1978-11-01), Gardner
patent: 4461974 (1984-07-01), Chin
patent: 4486689 (1984-12-01), Davis
patent: 4575640 (1986-03-01), Martin
Keane Patrick C.
Loveman Edward H.
Roskoski Bernard
Ultima Electronics Ltd.
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