Side plate tapered twist tab fastening device for fastening side

Details Side plate tapered twist tab fastening device for fastening side Side plate tapered twist tab fastening device for fastening side

1988-10-12

1990-01-16

Envall, Jr., Roy N.

Electricity: electrical systems and devices

Electrostatic capacitors

Fixed capacitor

335 16, 411531, H02B 104

Patent

active

048947474

ABSTRACT:
A molded case circuit breaker is provided with side plates having twist tabs extending downwardly from a bottom edge for fastening the side plates to the circuit breaker base. Spin plates with slots are carried by the base for receiving the twist tabs. The twist tabs are formed with a shank portion, a tapered portion and a head portion. The tapered portion defines a sloped surface which contacts the slot in the spin plate. When the twist tab is twisted, the shank is shortened drawing a wider portion of the sloped surface into the engagement with the slot to secure the side plate to the base.

REFERENCES:
patent: 3125190 (1964-03-01), Brennan
patent: 3976307 (1976-08-01), Ogisu
patent: 4191872 (1980-03-01), Sorenson
patent: 4489295 (1984-12-01), Altenhof, Jr. et al.
patent: 4638277 (1987-01-01), Thomas et al.
patent: 4642431 (1987-02-01), Tedesco et al.
patent: 4656444 (1987-04-01), McKee et al.
patent: 4679018 (1987-07-01), McKee et al.

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