Communications: electrical – Visual indication – Movable
Patent
1991-08-19
1993-12-14
Weldon, Ulysses
Communications: electrical
Visual indication
Movable
34081515, 3408152, 40902, G08B 500
Patent
active
052706982
ABSTRACT:
A switching device for flashing an installed light fixture, as for helping emergency response personnel locate a dwelling. A switch housing which is mountable within a conventional junction box encloses a switch having "off", "on", and "flash" positions. In the "flash" position, the switch cyclically completes and interrupts the installed 120 volt AC circuit so that the light fixture flashes on and off. A triac is employed as a relay for completing the circuit, and a timer-controlled driver portion is provided for actuating the triac. The triac driver actuates the triac at the beginning of each half-cycle of the AC current, in response to a low-voltage pulse which passes through a capacitor connected to the high-voltage lead. The timer may be a 555 IC timer, and a conversion network may be provided for supplying DC current for this. A piezoelectric element is also provided for generating an audible signal indicating that the "flash" mode has been actuated. The duty cycle of the device can be adjusted as desired, to provide anything from long-term illumination of the bulb to a short flash.
REFERENCES:
patent: 1500706 (1924-07-01), Isom
patent: 2202188 (1940-05-01), Cianchi
patent: 2429363 (1947-10-01), McLaren
patent: 3631318 (1971-12-01), Hubbard
patent: 4047165 (1977-09-01), Andreasson
patent: 4177408 (1979-12-01), Mason
patent: 4212003 (1980-07-01), Mishoe et al.
patent: 4254405 (1981-03-01), Wenzlaff
patent: 4276542 (1981-06-01), Russ
patent: 4287509 (1981-09-01), Beggs
patent: 4305070 (1981-12-01), Samuel
patent: 4532498 (1985-07-01), Gilmore
patent: 4556863 (1985-12-01), Devitt et al.
patent: 4682147 (1987-07-01), Bowman
patent: 4730184 (1988-03-01), Bach
patent: 4820956 (1989-04-01), Slobodzian et al.
patent: 4839630 (1989-06-01), Miller
patent: 4855723 (1989-08-01), Fritz et al.
patent: 4901461 (1990-02-01), Edwards et al.
patent: 4929936 (1990-05-01), Friedman et al.
Bishel Richard A.
Hoyle Patrick D.
Fatahi-yar M.
Weldon Ulysses
LandOfFree
Emergency signaling device does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Emergency signaling device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Emergency signaling device will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1708957