ANTHONY J FISHOVITZ
Engineers in Freedom, PA

5714940, Feb 3, 1998

Sep 26, 1996

8/723941

Anthony J. Fishovitz - Freedom PA
Thomas K. Fogle - Pittsburgh PA

Eaton Corporation - Cleveland OH

G08B 2100

340638

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.

5486978, Jan 23, 1996

Nov 4, 1994

8/334834

Anthony J. Fishovitz - Freedom PA

Eaton Corporation - Cleveland OH

H02B 114

361617

A cable interlock actuated by a plunger extended from the back of a draw-out circuit breaker when the breaker is closed, prevents closure of a second circuit breaker by holding it in the trip condition. A shutter which closes to prevent access to power system terminations at the rear of the draw-out circuit breaker enclosure when the breaker is removed, blocks operation of the interlock to prevent tripping of the other circuit breaker.