Patent US1042373A successfully refreshed from Google Patents.
Patent US3864655A successfully refreshed from Google Patents.
US3864655A
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Electric fuse for elevated circuit voltages having a plurality of ribbon fuse links connected in parallel
Assignee: GOLUD INC A DE CORP
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Filing: 1974-03-04
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Granted: 1975-02-04
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Expires: 1994-03-04
Abstract
Abstract An electric fuse for elevated circuit voltages has a plurality of ribbon fuse links connected in parallel. The fuse is designed to have full range interrupting or clearing capacity, i.e., to be able to interrupt small currents but slightly in excess of its minimum fusing current up to the largest major fault currents that may occur in distribution systems at points close to the source of power. This is achieved mainly by mounting on each of said plurality of fuse links a plurality of pellets of a gas evolving material, each of said plurality of fuse links having a metal-severing low fusing point overlay covered by one of said plurality of pellets and each of said plurality of fuse links being threaded through and supporting pellets of a gas evolving material which are positioned at points where there is no metalsevering low fusing point overlay.
Inventors
- 👤 Frederick J Kozacka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:56
CPC Classifications
H; H01; H01H; H01H85/00; H01H85/02; H01H85/04; H01H85/041; H01H85/042; H01H85/05; H01H85/055; H01H85/38; H01H85/42
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
240 words
An electric fuse for elevated ciruit voltages including a. a tubular casing of electric insulating material; b. a pair of electroconductive terminal elements closing the ends of said casing; c. a pulverulent arc-quenching filler of quartz particles inside said casing; d. a plurality of fusible elements forming parallel current paths conductively interconnecting said pair of terminal elements, each of said plurality of fusible elements having serially arranged alternating points of relatively small crosssectional area and of relatively large cross-sectional area; e. a plurality of metal-severing low fusing point overlays on said plurality of fusible elements, at least one of said plurality of metal-severing low fusing overlays being supported by each of said plurality of fusible elements, and f. a plurality of pellets of a gas-evolving material having a smaller thermal conductivity than said arc-quenching filler mounted on and supported by each of said plurality of fusible elements, said plurality of pellets having holes therein allowing each of said plurality of fusible elements to be threaded through one of said holes, and each of said plurality of fusible elements supporting at least one of said plurality of pellets arranged to cover one of said plurality of metalsevering low fusing point overlays, and each of said plurality of fusible elements further supporting at least one of said plurality of pellets arranged to cover one of said points of relatively small cross-sectional area from which a metalsevering low fusing point overlay is absent.
Claim 2
Dependent Claim
240 words
An electric fuse for elevated ciruit voltages including a. a tubular casing of electric insulating material; b. a pair of electroconductive terminal elements closing the ends of said casing; c. a pulverulent arc-quenching filler of quartz particles inside said casing; d. a plurality of fusible elements forming parallel current paths conductively interconnecting said pair of terminal elements, each of said plurality of fusible elements having serially arranged alternating points of relatively small crosssectional area and of relatively large cross-sectional area; e. a plurality of metal-severing low fusing point overlays on said plurality of fusible elements, at least one of said plurality of metal-severing low fusing overlays being supported by each of said plurality of fusible elements, and f. a plurality of pellets of a gas-evolving material having a smaller thermal conductivity than said arc-quenching filler mounted on and supported by each of said plurality of fusible elements, said plurality of pellets having holes therein allowing each of said plurality of fusible elements to be threaded through one of said holes, and each of said plurality of fusible elements supporting at least one of said plurality of pellets arranged to cover one of said plurality of metalsevering low fusing point overlays, and each of said plurality of fusible elements further supporting at least one of said plurality of pellets arranged to cover one of said points of relatively small cross-sectional area from which a metalsevering low fusing point overlay is absent.
Claim 3
Dependent Claim
25 words
An electric fuse as specified in claim 1 wherein said plurality of pellets are of a substance including inorganic ingredients and a melamine resin binder.
Claim 4
Dependent Claim
118 words
An electric fuse as specified in claim 1 wherein each of said plurality of fusible elements is provided with at least one of said plurality of metal-severing low fusing point overlays positioned at a first point relatively close to one of said pair of terminal elements and relatively remote from the median plane of said casing, and wherein each of said plurality of fusible elements is provided with at least one of said plurality of pellets positioned at a second point relatively remote from each of said pair of terminal elements and relatively close to said median plane of said casing, and at which second point none of said plurality of metal-severing low fusing point overlays is present.
Claim 5
Dependent Claim
127 words
An electric fuse as specified in claim 3 wherein said plurality of fusible elements includes two groups of fusible elements each having substantially the same number of fusible elements, and wherein the constituent fusible elements of one of said groups are each provided with one of said plurality of metal-severing low fusing point overlays arranged within one of said plurality of pellets and positioned at a point relatively close to one of ssid pair of terminal elements, and wherein the constituent fusible elements of the other of said groups are each provided with one of said plurality of metal-severing low fusing point overlays arranged within one of said plurality of pellets and positioned at a point relatively close to the other of said pair of terminal elements.
Claim 6
Dependent Claim
112 words
An electric fuse as specified in claim 1 wherein each of said plurality of fusible elements includes relatively long sections extending substantially parallel to the axis of said casing and relatively short sections slanting relative to said axis of said casing, each said plurality of beads being mounted on one of said relatively short sections and said relatively short sections having a length but slightly exceeding the length of each of said plurality of beads so that each of said plurality of beads is substantially fixedly positioned within said casing by virtue of the angular relation of said relatively short sections and said relatively long sections of said plurality of fusible elements.
Claim 7
Dependent Claim
54 words
An electric fuse as specified in claim 5 wherein said plurality of fusible elements includes pairs of fusible elements arranged substantially symmetrically relative to planes bisecting said casing, and wherein said pairs of fusible elements include pairs of relatively short sections converging toward points of intersection positioned substantially along the axis of said casing.
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) | 1978-02-03 | 1978-08-05 | 1979-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-03 | 1982-08-05 | 1983-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-03 | 1986-08-05 | 1987-02-04 | $7700.00 | Window Closed / Lapsed |