Electricity: electrothermally or thermally actuated switches – Thermally actuated switches – With fusible – combustible or explosive material
Patent
1982-11-26
1984-12-04
Broome, Harold
Electricity: electrothermally or thermally actuated switches
Thermally actuated switches
With fusible, combustible or explosive material
337407, H01H 3776
Patent
active
044867360
ABSTRACT:
Apparatus and methods for assembling a thermally-actuated cut-off link having a casing, a closure, split along its length to form a slot, a power lead, one end of which extends from the casing through a neutral passage formed in the closure, the other end of which terminates in a pair of outwardly deformed, inwardly deformable contact arms forced into low-resistance contact with an inner conductive surface of the casing, a fusible pellet, and a spring-biased arm-deforming member which, responsive to deform the contact arms away from the inner conductive surface to interrupt the flow of current through the cut-off link. The closure is secured to the casing by crimping the casing to grippingly contact the power lead and to narrow the slot. Relatively viscous sealant, placed in an enlarged section of the closure passage is drawn into the narrowed slot by capillary action, and is thereafter cured. The power lead is roughened, as by knurling, over that portion of the power lead at which the closure grips the power lead. The arm-deforming member is shaped and dimensioned to define an air space about the contact arms at those points at which the contact arms contact the casing, to minimize the effects of arcing caused by high voltages.
REFERENCES:
patent: 4246564 (1981-01-01), Olson et al.
patent: 4281309 (1981-07-01), Olson
patent: 4326186 (1982-04-01), Clay
Borzoni John M.
Olson Harry
Broome Harold
Hattis Russell E.
Littelfuse Inc.
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