Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1995-12-27
1997-08-12
Hofsass, Jeffery
Communications: electrical
Condition responsive indicating system
Specific condition
340638, 335 14, 335 17, G08B 2100
Patent
active
056570023
ABSTRACT:
A resettable, latching indicator is described. The indicator has a pair of electrical terminals through which it connects to the circuitry whose state is being indicated. The device includes an electromagnetic coil with a first lead connected to a first terminal of the device and a second lead connected to a first contact within the device. A second contact within the device is connected to the second indicator terminal, completing the circuit within the device. In a preferred embodiment, the device is arranged as a fuse state indicator with the device terminals connected in parallel with a fuse. Before fuse blow, an internal electrical contact is formed as the first and second contacts are closed an abutment formed on a spring-biased indicator flag. When the fuse blows, current passes through the coil, thus creating a magnetic field. The field moves a spring-biased armature having a catch which normally retains the indicator flag in a non-indicating position. When the armature is moved, the catch releases the flag. The energy stored in the flag's spring is thereby released and the flag moves from a first, non-indicating position to a second, indicating position. Upon moving to the non-indicating position, the flag's abutment no longer keeps the contact members closed. This cuts off all current to the coil after fuse blow.
REFERENCES:
patent: 2855483 (1958-10-01), Swing et al.
patent: 3225170 (1965-12-01), Chabala et al.
patent: 3958197 (1976-05-01), Gryctko
patent: 4186365 (1980-01-01), Fahnoe
patent: 4263589 (1981-04-01), Lewiner et al.
patent: 4336520 (1982-06-01), Trayer
patent: 4442471 (1984-04-01), Trayer
patent: 4473860 (1984-09-01), Thomas
patent: 4516182 (1985-05-01), Franklin
patent: 4598263 (1986-07-01), Heyne et al.
patent: 4625190 (1986-11-01), Wafer
patent: 4652867 (1987-03-01), Mascot
patent: 4703294 (1987-10-01), Yokoyama et al.
patent: 4906963 (1990-03-01), Ackermann et al.
patent: 4975673 (1990-12-01), Ikehata et al.
patent: 4987395 (1991-01-01), Ozaki
patent: 5003139 (1991-03-01), Edds et al.
patent: 5041805 (1991-08-01), Ohishi et al.
patent: 5140115 (1992-08-01), Morris
patent: 5153565 (1992-10-01), Schweitzer, Jr.
patent: 5172294 (1992-12-01), Ineichen et al.
patent: 5192941 (1993-03-01), Fishovitz et al.
patent: 5260679 (1993-11-01), Viscogliosi
patent: 5264673 (1993-11-01), Powell
patent: 5319344 (1994-06-01), Mosesian et al.
Electrodynamics, Inc.
Hofsass Jeffery
Trieu Van T.
LandOfFree
Resettable latching indicator does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Resettable latching indicator, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Resettable latching indicator will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-163094