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US 10,827,562 B2Granted
Heat sensitive electrical safety device
OwnerAlbert Chi Man Aoinventor
Life of this patent
Estimating the term…
Abstract
This disclosure relates to a heat sensitive electrical safety device with a manually resettable device and an automatically resettable fuse. The manually settable fuse prolongs the serviceable life of the automatically resettable fuse.
Claims20
A heat sensitive electrical safety device for use with a heat producing electrical device, comprising:
- a first temperature-sensitive control switch, the first temperature-sensitive control switch including a pressure variable head;
- and
- a second temperature-sensitive control switch including a metallic blade, a bimetal strip, and a control circuit, the control circuit being normally closed through the metallic blade, and the second temperature-sensitive control switch being in physical contact with the first temperature-sensitive control switch;
- wherein when a temperature of the heat producing electrical device exceeds a first predetermined temperature, the pressure variable head of the first temperature-sensitive control switch increases in pressure and applies a contact force to the metallic blade to break a circuit path of the normally closed control circuit;
- wherein when the circuit path is broken, the control circuit is configured to continue receiving electric current through the bimetal strip and causing the bimetal strip to be heated, and when the heated bimetal strip reaches a second predetermined temperature, the heated bimetal strip being configured to retain the breaking of the control circuit even after the heat producing electrical device returns to below the first predetermined temperature and allowing the pressure in the pressure variable head to decrease;
- and
- wherein when a temperature of the bimetal strip is below the second predetermined temperature, the bimetal strip returns to a configuration closing the control circuit.
4 more elements
A method for using a heat sensitive electrical safety device with a heat producing electrical device, the method comprising:
- providing the heat sensitive electrical safety device comprising:
- a first temperature-sensitive control switch, the first temperature-sensitive control switch including a pressure variable head;
- and
- a second temperature-sensitive control switch including a metallic blade, a bimetal strip, and a control circuit, the control circuit being normally closed through the metallic blade, and the second temperature-sensitive control switch being in physical contact with the first temperature-sensitive control switch;
- wherein when a temperature of the heat producing electrical device exceeds a first predetermined temperature, the pressure variable head of the first temperature-sensitive control switch increases in pressure and applies a contact force to the metallic blade to break a circuit path of the normally closed control circuit;
- wherein when the circuit path is broken, the control circuit is configured to continue receiving electric current through the bimetal strip and causing the bimetal strip to be heated, and when the heated bimetal strip reaches a second predetermined temperature, the heated bimetal strip being configured to retain the breaking of the control circuit even after the heat producing electrical device returns to below the first predetermined temperature and allowing the pressure in the pressure variable head to decrease;
- and
- wherein when a temperature of the bimetal strip is below the second predetermined temperature, the bimetal strip returns to a configuration closing the control circuit.
5 more elements
Dependencies are inferred from the claim text.