Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1996-09-26
1998-02-03
Hofsass, Jeffery
Communications: electrical
Condition responsive indicating system
Specific condition
335 17, 324424, 200400, G08B 2100
Patent
active
057149402
ABSTRACT:
A bell alarm system is provided for a circuit breaker in which the actuation of a flux shift trip device causes an electrical switch to be energized thus providing a bell alarm indication that the circuit breaker has been tripped. The flux trip device impinges against a pivotally rotated lower lever mechanism which has a knee which causes rotation of an upper lever against the influence of a spring attached between the two levers. As the knee moves along a surface of the upper lever mechanism, the relative rotation of the two lever members about their support pins is such as to cause the tension on the spring to increase. Because of this vibration in the circuit breaker itself or minute low level movements of the plunger mechanism will not cause the bell alarm to be actuated. The bell alarm will not be actuated until the aforementioned lower knee has rotated sufficiently far along the previously described surface to clear an upper knee in the upper lever mechanism thus allowing the force of the spring to cause the upper lever to actuate the bell alarm.
REFERENCES:
patent: 3562733 (1971-02-01), Murphy et al.
patent: 3955162 (1976-05-01), Nicol
patent: 4114005 (1978-09-01), Maier et al.
patent: 5192941 (1993-03-01), Fishoitz et al.
Instructions for the Systems Pow-R Breaker and Drawout Mechanism -400, 800, 1200, 1600, 2000C, 2500, 3000, 4000, 5000 Amp Frames -Effective Apr., 1994 -Style 6647C23H01.
Fishovitz Anthony J.
Fogle Thomas K.
Eaton Corporation
Hofsass Jeffery
Lieu Julie B.
Moran Martin J.
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