Electric heating – Heating devices – Combined with pressure application means
Patent
1984-01-26
1985-08-20
Bartis, A.
Electric heating
Heating devices
Combined with pressure application means
38 7783, 219517, 337 3, 337403, 337407, 337414, D06F 7526, H05B 102, H01H 3776
Patent
active
045366411
ABSTRACT:
A thermostatically controlled electric flatiron having a heater circuit of sufficient wattage to achieve abnormally high soleplate temperatures on continuous operation is provided with an overtemperature protection assembly for opening the heater circuit before damaging high soleplate temperature occurs on thermostat failure. The assembly includes first and second members connected in the heater circuit and electrically isolated from the soleplate and each other bridged by a third spring-biased circuit member to complete the heater circuit. A slug of eutectic alloy forms a fusible joint bonding the third member intermediate its ends to one of the first and second members to hold the third member against the spring bias in circuit completing contact with the first and second. The fusible joint has a melting point above the maximum operating temperature of the flatiron but less than the abnormally high temperature and is out of the heater circuit so that the fusible joint is not a current carrying element and there is no local heat generated therein by joint resistance and operation of the assembly is not influenced by any variable joint resistance.
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Bartis A.
Black & Decker Inc.
Platt Leonard J.
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