Electricity: circuit makers and breakers – Electric switch details – Contact
Patent
1979-09-24
1981-10-13
Shepperd, John W.
Electricity: circuit makers and breakers
Electric switch details
Contact
200 67PK, 200245, H01H 360
Patent
active
042950244
ABSTRACT:
An improved electrical switch unit is provided having a strategically located, shock-absorbing member which absorbs a large proportion of potentially damaging impact forces developed during switch closing operations and thus preserves the soft metal switch contact shafts against significant deformation and consequent alteration in the operational characteristics of the switch. The shock-absorbing function is advantageously performed by a low-mass, spring-biased weld break lever associated with the over toggle switch operating mechanism. During the switch closing sequence the contact-shifting operating arm of the switch operating apparatus engages the biased weld break lever and the latter serves to slow the relative closing speed of the contacts prior to the instant of impact therebetween; in this manner a significant amount of the impact forces are absorbed which would otherwise be absorbed by the contact shafts themselves.
REFERENCES:
patent: 1452472 (1923-04-01), Plehaty
patent: 3129308 (1964-04-01), Yokoyama et al.
patent: 3165608 (1965-01-01), Wallace
patent: 3337703 (1967-08-01), Yamada
patent: 3529111 (1970-09-01), Lupish et al.
patent: 3562454 (1971-02-01), Chance
A. B. Chance Company
Shepperd John W.
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