Electricity: electrothermally or thermally actuated switches – Electrothermally actuated switches – With longitudinally expansible solid element
Patent
1986-08-14
1987-07-07
Broome, Harold
Electricity: electrothermally or thermally actuated switches
Electrothermally actuated switches
With longitudinally expansible solid element
337 96, 337354, H01H 6108, H01H 7114
Patent
active
046790233
ABSTRACT:
An over-temperature control for a thermostat uses an electrical contact actuator of a memory metal having an ability to change its physical configuration at a transition temperature to a "memory" shape. The contact actuator is arranged to bear against a cantilevered leaf spring having electrical contacts at a free end of the spring while the other fixed end of the spring is connected to complete an electrical circuit through the spring. The spring is also actuated by a bi-metallic element to produce a normal temperature responsive operation of the thermostat. The memory material actuator is arranged to provide a flexing of the spring cantilever to move the free end contact between a first and a second electrical terminal when the memory material is exposed to a transition temperature allowing the actuator to assume its "memory" shape. The "memory" shape of the memory material is, thus, effective to propel the end of the leaf spring and the electrical contact carried thereby from a first position to a second position to produce an over-temperature response operation of the thermostat.
REFERENCES:
patent: 3176099 (1965-03-01), Bergsma
patent: 3466449 (1969-09-01), Ellenberger
patent: 3594675 (1971-07-01), Willson
patent: 3634803 (1972-01-01), Willson et al.
patent: 3872415 (1975-03-01), Clarke
patent: 4517543 (1985-05-01), Brubaker
patent: 4520336 (1985-05-01), Hastings et al.
patent: 4538201 (1985-08-01), Wuyts et al.
patent: 4568904 (1986-02-01), Takahashi et al.
Broome Harold
Halista Mitchell J.
Honeywell Inc.
Medved Albin
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