Patent US3617971A successfully refreshed from Google Patents.
US3617971A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermal switch with a bimetallic strip and a heat storage device
Assignee: Individual
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Filing: 1969-11-05
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Granted: 1971-11-02
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Expires: 1989-11-05
Abstract
Abstract A thermal switch has a housing and a heat storage device having the shape of a parallelopipedic metal block swingably mounted by a pin in the housing. A bimetallic strip has an end fixed to the heat storage device on one side of its pin. A metal strip has an end fixed to the opposite side of the heat storage device. The metal strip carries electrical heating winding. A contact bridge is actuated by the bending of the bimetallic strip caused by the heating by the heat storage device.
Inventors
- 👤 Jakob Ellenberger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:12
CPC Classifications
H; H01; H01H; H01H71/00; H01H71/74; H01H71/7427; H01H71/7436; H01H73/00; H01H73/22; H01H73/30; H01H73/306
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
104 words
A thermal switch, comprising a housing, a heat storage device having the shape of a parallelopipedic metal block, a pin swingably supporting said heat storage device within said housing, a bimetal strip having an end fixed to said heat storage device to one side of said pin, a metal strip having an end fixed to said heat storage device to the opposite side of said pin, an electrical heating winding carried by said metal strip, a contact bridge, and means actuated by the bending of the bimetal strip when the bimetal strip is heated by said heat storage device for actuating said contact bridge.
Claim 2
Dependent Claim
104 words
A thermal switch, comprising a housing, a heat storage device having the shape of a parallelopipedic metal block, a pin swingably supporting said heat storage device within said housing, a bimetal strip having an end fixed to said heat storage device to one side of said pin, a metal strip having an end fixed to said heat storage device to the opposite side of said pin, an electrical heating winding carried by said metal strip, a contact bridge, and means actuated by the bending of the bimetal strip when the bimetal strip is heated by said heat storage device for actuating said contact bridge.
Claim 3
Dependent Claim
77 words
A switch according to claim 1, wherein said means comprise a leaf spring located within said housing and having an end fixed to said housing, said leaf spring having another free end bearing against the free end of said bimetal strip and a retaining lug carried by the free end of said leaf spring, said retaining lug being adapted to engage said contact bridge and hold it in a closed position when the bimetal strip is bent.
Claim 4
Dependent Claim
35 words
A switch according to claim 1, further comprising an adjustable screw carried by said housing and engaging the opposite end of said metal strip, said pin supporting said heat storage device substantially in its center.
Claim 5
Dependent Claim
34 words
A switch according to claim 3, further comprising a compression spring carried by said housing and engaging that surface of said opposite end of said metal strip which is furthest from said bimetal strip.
Claim 6
Dependent Claim
72 words
A switch according to claim 1, comprising a second bimetal strip having an end connected to the other end of said metal strip and connected in series with said electrical heating winding, a contact carried by the other end of said second bimetal strip, a second contact and means carried by said housing and carrying said second contact, said second contact engaging the first-mentioned contact when said second bimetal strip is cold.
Claim 7
Dependent Claim
23 words
A switch according to claim 5, wherein the last-mentioned means consist of a screw adapted to adjust the position of said second contact.
Claim 8
Dependent Claim
26 words
A switch according to claim 1, comprising a compensating bimetal strip connected to the other end of said metal strip for the compensation for ambient temperature.
Claim 9
Dependent Claim
62 words
A switch according to claim 7, comprising a compression spring and an adjustable screw, one end of said compensating bimetal strip being located in a slot formed in said housing, said compression spring being connected with said adjustable screw and the other end of said compensating bimetal strip, said metal strip being connected substantially to the center of said compensating bimetal strip.
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) | 1974-11-01 | 1975-05-03 | 1975-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-01 | 1979-05-03 | 1979-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-01 | 1983-05-03 | 1983-11-02 | $7700.00 | Window Closed / Lapsed |