Electricity: electrothermally or thermally actuated switches – Electrothermally actuated switches – Shunt or short circuit completion devices
Patent
1989-12-11
1990-08-07
Broome, H.
Electricity: electrothermally or thermally actuated switches
Electrothermally actuated switches
Shunt or short circuit completion devices
337 75, 337108, H01H 6100, H01H 7114
Patent
active
049471473
ABSTRACT:
According to one aspect of the invention, it comprises a fireproof enclosure having a first and a second electrical terminal. The first electrical terminal is coupled to an electrical contact internal the fireproof enclosure. An actuating member is provided in the trip mechanism. A first end is inside the mechanism, while a second end extends outside. The actuator member is biased to have the first end in contact to the electrical contact at a first position. The first end has a bimetallic latch coupled thereto. The bimetallic latch comprises a contact portion at the point of coupling to the first end and a first and second wing portion extending from the contact portion. Ledges are disposed on the interior of the trip mechanism. The wing portions engage the ledges to hold the actuator member at a second position. The second position establishes a gap between the electrical contact and the contact portion of the bimetallic latch. The gap has a preselected distance, which is dependent upon the operating voltage of the sign segments. The second electrical terminal is coupled to the contact portion of the bimetallic latch. The second end of the actuator member is operable to move the actuator member from the first position to the second position.
REFERENCES:
patent: 2474600 (1949-06-01), Stender et al.
patent: 2479179 (1949-08-01), Newbill
patent: 2574278 (1951-11-01), Morgan
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