Spring drive mechanism for switchgear, in particular a circuit b

Details Spring drive mechanism for switchgear, in particular a circuit b Spring drive mechanism for switchgear, in particular a circuit b

1998-11-12

2000-05-23

Friedhofer, Michael A

Electricity: circuit makers and breakers

Gear driven

200400, H01H 340

Patent

active

060668202

ABSTRACT:
A spring drive mechanism for switchgear, in particular for a circuit breaker. The mechanism has an engagement shaft that is rotatable about its axis, a large toothed-wheel mounted on said shaft, a small toothed-wheel meshing with said large toothed-wheel to put an engagement spring under stress, and a mechanism which prevents the large toothed-wheel and the small toothed-wheel jamming each other mutually after the shaft has been released. The mechanism which prevents jamming includes the shape of the teeth of said small toothed-wheel and the shape of the teeth of the large toothed-wheel. In the teeth of the large toothed-wheel there is a first gap followed, in the direction of rotation, by a first retractable tooth that is retractable along the axis of the tooth against bias from a spring. This tooth is followed by a second gap extending over a length that is not less than two gear pitch steps and is slightly less than an integer number of steps. The tooth immediately following said second gap is a second retractable tooth retractable along its axis against bias from a spring. Each of the retractable teeth and the first non-retractable tooth following the last retractable tooth has flanks that meet radially outwards at a common edge, and includes an inclined plane in its top zone adjacent to the edge.

REFERENCES:
patent: 4095676 (1978-06-01), Howe et al.
patent: 4681993 (1987-07-01), Kondo et al.
patent: 5113056 (1992-05-01), Kuhn
patent: 5541378 (1996-07-01), Niklaus

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