US4237513A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermoconstrictive disconnect of conductors in electrical apparatus
Assignee: Individual
•
Filing: 1978-10-25
•
Granted: 1980-12-02
•
Expires: 1998-10-25
Abstract
Abstract A protective disconnect to prevent overheating of electrical apparatus is described. The device consists of a cutting member accepting a conductor and capable, upon closure, of severing said conductor. The cutting member is surrounded by a thermoconstrictive material which, upon being subjected to heat at a certain temperature, actuates said member.
Inventors
- 👤 Stephen Foldes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 02:59
CPC Classifications
H; H01; H01H; H01H37/00; H01H37/74; Y; Y10; Y10S; Y10S174/00; Y10S174/08
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
67 words
Overheating protection for electrical apparatus having internal wirings, including a conductor carrying current vital to the operation of said apparatus, disconnect means comprising a shearing member, having cutting jaws engaging said conductor and a covering of thermoconstrictive material surrounding said shearing member, said material having a coefficient of constriction at a selected temperature sufficient to produce a force for closing said jaws and thereby severing said conductor.
Claim 2
Dependent Claim
67 words
Overheating protection for electrical apparatus having internal wirings, including a conductor carrying current vital to the operation of said apparatus, disconnect means comprising a shearing member, having cutting jaws engaging said conductor and a covering of thermoconstrictive material surrounding said shearing member, said material having a coefficient of constriction at a selected temperature sufficient to produce a force for closing said jaws and thereby severing said conductor.
Claim 3
Dependent Claim
36 words
Disconnect means in accordance with claim 1, wherein said shearing member is of plastic material of cylindrical shape having cutting edges adapted to surround a conductor and, cutting said conductor upon compression by said thermoconstrictive material.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-12-02 | 1984-06-02 | 1984-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-02 | 1988-06-02 | 1988-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-02 | 1992-06-02 | 1992-12-02 | $7700.00 | Window Closed / Lapsed |