Snap-acting normally closed AC relay

Details Snap-acting normally closed AC relay Snap-acting normally closed AC relay

1992-08-10

1993-11-09

Donovan, Lincoln

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

Polarity-responsive

335 83, 335128, H01H 5122

Patent

active

052606775

ABSTRACT:
A normally closed AC relay with a stator core with primary and shaded poles, a pivotal clapper, an elongated leaf spring fixed to the clapper providing a clapper return spring and a clapper overtravel spring extending radially outwardly from the outer end of the clapper, the overtravel spring being substantially narrower than the rest of the leaf spring to reduce the weight and moment of inertia of the overtravel spring and the complete clapper assembly, the overtravel spring having a spring rate significantly greater than the return spring and both the overtravel spring and clapper assembly having a natural frequency significantly greater than twice the frequency of the AC source so that the clapper is actuated to open the relay without incipient switch chatter.

REFERENCES:
patent: 4498065 (1985-02-01), Nagamoto et al.
patent: 4691181 (1987-09-01), Katsutani et al.
patent: 4937544 (1990-06-01), Mueller
patent: 4951017 (1990-08-01), Buchschmid et al.
patent: 5065127 (1991-11-01), Mitschir et al.
patent: 5095294 (1992-03-01), Chikira et al.
patent: 5155458 (1992-10-01), Gamble

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