Electricity: magnetically operated switches – magnets – and electr – Electromagnetically actuated switches – Tripping means
Patent
1991-02-21
1992-09-29
Donovan, Lincoln
Electricity: magnetically operated switches, magnets, and electr
Electromagnetically actuated switches
Tripping means
335167, 335 6, 335 21, H01H 900
Patent
active
051516713
ABSTRACT:
A circuit breaker includes a compressive turning spring hung between a movable contact arm pivoted at an end to a handle rotatably mounted to a first reference position and a cradle pivotably mounted to a second reference position and disengageably locked to an abnormal current detection and trip mechanism. Under normal operation of the breaker, the turning spring exerts a contact pressure between movable and fixed contacts. Upon detection of an abnormal current, the turning spring is caused to turn so as to open the contacts. With this arrangement, the dispositions of constituent elements and their interlocking assembly can be simplified.
REFERENCES:
patent: 3254176 (1966-05-01), Gelzheiser
patent: 3742402 (1973-06-01), Nicol et al.
patent: 4616199 (1986-10-01), Oster
patent: 5003139 (1991-03-01), Edds et al.
Aoyama Youichi
Hirao Akihiko
Hiroshima Tatsuo
Matsuoka Yukihiro
Sawada Tomoyuki
Donovan Lincoln
Matsushita Electric & Works Ltd.
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