US3789339A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermostatic switch
Assignee: Portage Electric Products Inc
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Filing: 1973-04-16
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Granted: 1974-01-29
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Expires: 1993-04-16
Abstract
Abstract A thermostatic switch having a bimetallic electric-contactcarrying blade with a dish-shaped snap portion is provided. ''''Creep'''' opening of the contacts prior to snap-open action is substantially eliminated by forming the terminal arm that carries the bimetallic blade and the fulcrum for the dish-shaped portion of a bimetal positioned to deflect in response to temperature change in a direction opposite to the direction in which the bimetallic blade deflects.
Inventors
- 👤 G Wehl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:02
CPC Classifications
H; H01; H01H; H01H37/00; H01H37/02; H01H37/32; H01H37/52; H01H37/54; H01H37/5418; H01H2037/5445
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
134 words
In a thermostatic snap switch of the type comprising: a mounting member; first and second terminal arms supported by said mounting member extending out therefrom in spaced relationship with each other; an elongated bimetal blade adapted to deflect in response to a temperature change having one end coupled to the first arm and the other end free extending along the side of the first arm directed toward the second arm, said blade having a part thereof dished to provide a snap-acting portion; and fulcrum means carried by the first arm and bearing on the strip; the improvement wherein said one arm is formed of a bimetal positioned to deflect in response to temperature change in a direction opposite to the direction in which the bimetal blade deflects in response to the same temperature change.
Claim 2
Dependent Claim
134 words
In a thermostatic snap switch of the type comprising: a mounting member; first and second terminal arms supported by said mounting member extending out therefrom in spaced relationship with each other; an elongated bimetal blade adapted to deflect in response to a temperature change having one end coupled to the first arm and the other end free extending along the side of the first arm directed toward the second arm, said blade having a part thereof dished to provide a snap-acting portion; and fulcrum means carried by the first arm and bearing on the strip; the improvement wherein said one arm is formed of a bimetal positioned to deflect in response to temperature change in a direction opposite to the direction in which the bimetal blade deflects in response to the same temperature change.
Claim 3
Dependent Claim
28 words
The thermostatic switch in accordance with claim 1 wherein the first arm deflects at a rate equal to or greater than the rate at which the blade deflects.
Claim 4
Dependent Claim
36 words
The switch in accordance with claim 1 wherein the first arm deflects toward the second arm with an increase in temperature and said bimetal blade deflects toward tHe first arm with the same increase in temperature.
Claim 5
Dependent Claim
19 words
The switch in accordance with claim 1 wherein the fulcrum bears on the dished snap-acting portion of the blade.
Claim 6
Dependent Claim
22 words
The switch in accordance with claim 1 wherein the fulcrum bears on the dished snap-acting forward edge of the dished snap-acting portion.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-28 | 1977-07-30 | 1978-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-28 | 1981-07-30 | 1982-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-28 | 1985-07-30 | 1986-01-29 | $7700.00 | Window Closed / Lapsed |