Electricity: electrothermally or thermally actuated switches – Electrothermally actuated switches – With bimetallic elements
Patent
1989-04-13
1990-06-05
Broome, H.
Electricity: electrothermally or thermally actuated switches
Electrothermally actuated switches
With bimetallic elements
337 74, H01H 7116
Patent
active
049317628
ABSTRACT:
A two pole breaker employs molded resinous parts including a base and support frame structure. Supported to a medial plane frame by a pin is a rocker handle having a linkage crank arm at each side of the medial plane and a rotatable latch lever having trip surfaces accessible to a bi-metallic overload actuator of each pole. A rocker member generally transverse to the normal position of the latch lever has a latch surface which cooperates with a latch keeper on the latch lever which is held engaged by a spring between the latch lever and the medial plane. The rocker has parallel side members, each supporting a switch actuator surface on each side of the medial plane frame. Identical linkage connections on each side of the medial plane connect the crank arms to the respective side pieces of the rocker. Overload causes a bi-metal actuator to move the latch lever in opposition to its spring to release the rocker to a position to which the guide slot directs it allowing the contacts to open and moving the handle and linkage pins to a position where they are moved back over center. The handle movement pulls the rocker back up into position to relatch with the latch lever, moving the latch lever out of the way against the action of the spring, if needed.
REFERENCES:
patent: 4167720 (1979-09-01), Krasser
patent: 4258349 (1981-03-01), Flory
patent: 4338586 (1982-07-01), Scanlon
patent: 4436972 (1984-03-01), Scanlon
Broome H.
Heinemann Electric Company
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