US3641469A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric fuse
Assignee: Individual
•
Filing: 1970-09-09
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Granted: 1972-02-08
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Expires: 1990-09-09
Abstract
Abstract An electric fuse, especially for electric lighters in motor vehicles, comprising electrically conductive fusible means for releasing at a given temperature an electrically conductive metal plate to open the electric circuit and interrupt the supply of current.
Inventors
- 👤 Luigi Pramaggiore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:22
CPC Classifications
H; H01; H01H; H01H37/00; H01H37/74; H01H37/76; H01H37/761; F; F23; F23Q; F23Q7/00; H01H2037/762; H01H2037/763
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
142 words
An electric fuse for electric lighters in motor vehicles, comprising a receptacle of insulating material for said electric lighter, an electrically conductive terminal projecting from said receptacle, a resilient member connected at one end to said terminal and carrying at its opposite end a contact blade, said resilient member having a first operative and a second inoperative position, and electrically conductive temperature responsive means insulatingly supported by said receptacle with respect to said terminal for maintaining said resilient member in said first position thereof at temperatures below a predetermined temperature and adapted to release said resilient member at temperatures above said predetermined temperature, and electrically conductive means for assembling as a unit said receptacle, said temperature responsive means and said resilient member in said first position thereof, said last-named means being adapted to engage a center projecting pin of a cigarette lighter.
Claim 2
Dependent Claim
142 words
An electric fuse for electric lighters in motor vehicles, comprising a receptacle of insulating material for said electric lighter, an electrically conductive terminal projecting from said receptacle, a resilient member connected at one end to said terminal and carrying at its opposite end a contact blade, said resilient member having a first operative and a second inoperative position, and electrically conductive temperature responsive means insulatingly supported by said receptacle with respect to said terminal for maintaining said resilient member in said first position thereof at temperatures below a predetermined temperature and adapted to release said resilient member at temperatures above said predetermined temperature, and electrically conductive means for assembling as a unit said receptacle, said temperature responsive means and said resilient member in said first position thereof, said last-named means being adapted to engage a center projecting pin of a cigarette lighter.
Claim 3
Dependent Claim
101 words
A fuse according to claim 1, wherein said receptacle is formed with an opening, said temperature responsive means comprising an electrically conductive fusible washer having a face in substantial engagement with said receptacle and with the opening in said Washer in alignment with said opening in said receptacle, and an electrically conductive end washer on the opposite face of the fusible washer with its opening in alignment with the openings in said receptacle and in said fusible washer, said assembly means comprising a rivet extending through all said openings for holding together said receptacle, said fusible washer and said end washer.
Claim 4
Dependent Claim
32 words
A fuse according to claim 1, wherein said receptacle defines over at least a portion of its periphery a curved surface adapted to guide said resilient member into said first position thereof.
Claim 5
Dependent Claim
46 words
A fuse according to claim 2, wherein said resilient member comprises a steel spring and said contact blade at said opposite end of said member comprises a bronze blade located in said first position of said resilient member between said fusible washer and said end washer.
Claim 6
Dependent Claim
67 words
A fuse according to claim 4, wherein the bronze blade carried by the free end of the steel spring extends in a plane substantially perpendicularly to said steel spring and has a semicircular recess at its free end to facilitate the insertion of the bronze blade between said fusible washer and said end washer to ensure engagement of the bronze blade with the shaft of said rivet.
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) | 1975-02-07 | 1975-08-09 | 1976-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-07 | 1979-08-09 | 1980-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-07 | 1983-08-09 | 1984-02-08 | $7700.00 | Window Closed / Lapsed |