Patent US3848215A successfully refreshed from Google Patents.
US3848215A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid-tight electric fuse
Assignee: GOLUD INC A DE CORP
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Filing: 1973-11-09
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Granted: 1974-11-12
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Expires: 1993-11-09
Abstract
Abstract An electric fuse rendered fluid-tight by means of a single piece sleeve of a heat-shrinkable and heat-shrunk substance. The sleeve covers the cylindrical casing of the fuse and the lateral surfaces of cylindrical coaxial extensions of terminal plugs of the fuse having substantially the same diameter as the inner diameter of the casing. The portions of the sleeve overlapping the lateral surfaces of the aforementioned extensions are clamped against said surfaces by annular metal clamps which are provided with adjustment or clamping screws.
Inventors
- 👤 F Kozacka
- 👤 E Salzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:35
CPC Classifications
H; H01; H01H; H01H85/00; H01H85/02; H01H85/04; H01H85/05; H01H85/165
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
195 words
An electric fuse including a cylindrical casing of electric insulating material, a pulverulent arc-quenching filler inside of and in engagement with said casing, metallic plug terminals having an outer diameter equal to the inner diameter of said casing plugging the ends of said casing, fusible element means inside said casing immersed in said pulverulent arcquenching filler conductively interconnecting said pair of plug terminals and a fluid-tight single piece sleeve of heat-shrinkable and heat-shrunk substance mounted under stress upon said casing wherein the improvement comprises a. cylindrical coaxial extensions on and integral with said plug terminals projecting axially beyond said casing to the outside of said casing, said extensions having an outer diameter substantially equal to the inner diameter of said casing so that the extent of shrinkage required to mount said sleeve tightly on said casing and to mount said sleeve tightly on said extensions is substantially equal; and b. annular metal clamps having adjustment screws for varying the extent of the periphery thereof mounted on said extensions and on portions of said sleeve extending beyond said casing and overlapping said extensions, said annular metal clamps clamping said portions of said sleeve against said extensions.
Claim 2
Dependent Claim
195 words
An electric fuse including a cylindrical casing of electric insulating material, a pulverulent arc-quenching filler inside of and in engagement with said casing, metallic plug terminals having an outer diameter equal to the inner diameter of said casing plugging the ends of said casing, fusible element means inside said casing immersed in said pulverulent arcquenching filler conductively interconnecting said pair of plug terminals and a fluid-tight single piece sleeve of heat-shrinkable and heat-shrunk substance mounted under stress upon said casing wherein the improvement comprises a. cylindrical coaxial extensions on and integral with said plug terminals projecting axially beyond said casing to the outside of said casing, said extensions having an outer diameter substantially equal to the inner diameter of said casing so that the extent of shrinkage required to mount said sleeve tightly on said casing and to mount said sleeve tightly on said extensions is substantially equal; and b. annular metal clamps having adjustment screws for varying the extent of the periphery thereof mounted on said extensions and on portions of said sleeve extending beyond said casing and overlapping said extensions, said annular metal clamps clamping said portions of said sleeve against said extensions.
Claim 3
Dependent Claim
41 words
An electric fuse as specified in claim 1 wherein the diameter of said extensions is equal to the inner diameter of said casing so that said plug terminals and said extensions thereof have lateral surfaces which are a continuous cylindrical surface.
Claim 4
Dependent Claim
25 words
An electric fuse as specified in claim 1 wherein the axially outer edges of said sleeve are covered and protected by said annular metal clamps.
Claim 5
Dependent Claim
75 words
An electric fuse as specified in claim 1 wherein the axial length of each of said extensions and the width of each of said annular metal clamps are substantially equal so that the lateral surfaces of said extensions are substantially unexposed and wherein the axial end surfaces of said extensions are exposed and form contact surfaces allowing insertion of said fuse into an electric circuit by means of said exposed end surfaces of said extensions.
Claim 6
Dependent Claim
44 words
An electric fuse as specified in claim 1 being submersed in a body of liquid and having a sleeve shrunk so as to engage tightly the planar annular areas situated between the lateral surface of said casing and the lateral surfaces of said extensions.
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) | 1977-11-11 | 1978-05-13 | 1978-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-11 | 1982-05-13 | 1982-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-11 | 1986-05-13 | 1986-11-12 | $7700.00 | Window Closed / Lapsed |