US3810062A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High-voltage fuse having full range clearing ability
Assignee: GOLUD INC A DE CORP
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Filing: 1972-05-04
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Granted: 1974-05-07
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Expires: 1992-05-04
Abstract
Abstract A high-voltage fuse having full range clearing ability, i.e., capable of interrupting overload currents so small that it may take one or even several hours to cause blowing of the fuse on account of the overload currents, and also capable of interrupting major fault currents, and further capable of interrupting all currents between these extremes. This is mainly achieved by threading the fusible elements through relatively large beads of a material having an extremely low thermal conductivity. Each of the beads may be provided with several substantially parallel bores, or passageways, each receiving one of a plurality of helically wound fusible elements. Such multiple bore beads form spacers between a plurality of helically wound fusible elements not supported by a star shaped mandrel structure, add to their support by a pulverulent arc-quenching filler, and tend to maintain an equidistant spacing between such fusible elements.
Inventors
- 👤 F Kozacka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:26
CPC Classifications
H; H01; H01H; H01H85/00; H01H85/02; H01H85/04; H01H85/05; H01H85/055; H01H85/041; H01H85/042; H01H85/38; H01H85/42
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
200 words
An electric current-limiting fuse capable of clearing overload currents equal to or less than the one hour fusing current including a. a tubular casing of electric insulating material; b. terminal elements closing the ends of said casing; c. a fusible element in ribbon form inside said casing having serially arranged points of reduced cross-sectional area conductively interconnecting said pair of terminal elements; d. a pulverulent arc-quenching filler inside said casing submersing said fusible element; and e. means for causing formation of series multibreaks in said fusible element on occurrence of overload currents at least as small as the one hour fusing current and lasting for at least one hour, said means including a plurality of overlays of a metal-severing low fusing point metal on said fusible element and a plurality of beads of an electric insulating material having a thermal conductivity less than 0.50 Btu/Hr/sq ft/*F/ft mounted on said fusible element each covering one of said plurality of overlays, the material of said plurality of beads being a mixture of a melamine resin and inorganic fillers and each of said plurality of beads having a length exceeding the spacing between contiguous points of reduced cross-sectional area of said fusible element.
Claim 2
Dependent Claim
200 words
An electric current-limiting fuse capable of clearing overload currents equal to or less than the one hour fusing current including a. a tubular casing of electric insulating material; b. terminal elements closing the ends of said casing; c. a fusible element in ribbon form inside said casing having serially arranged points of reduced cross-sectional area conductively interconnecting said pair of terminal elements; d. a pulverulent arc-quenching filler inside said casing submersing said fusible element; and e. means for causing formation of series multibreaks in said fusible element on occurrence of overload currents at least as small as the one hour fusing current and lasting for at least one hour, said means including a plurality of overlays of a metal-severing low fusing point metal on said fusible element and a plurality of beads of an electric insulating material having a thermal conductivity less than 0.50 Btu/Hr/sq ft/*F/ft mounted on said fusible element each covering one of said plurality of overlays, the material of said plurality of beads being a mixture of a melamine resin and inorganic fillers and each of said plurality of beads having a length exceeding the spacing between contiguous points of reduced cross-sectional area of said fusible element.
Claim 3
Dependent Claim
44 words
An electric fuse as specified in claim 1 wherein said fusible element is of silver, said arc-quenching filler is quartz sand and the material of said plurality of beads has a thermal conductivity in the order of 1/4 of the thermal conductivity of steatite.
Claim 4
Dependent Claim
47 words
An electric fuse as specified in claim 1 including a plurality of fusible elements connected in parallel and a plurality of beads each having a plurality of bores, each of said plurality of fusible elements being threaded through a bore in one of said plurality of beads.
Claim 5
Dependent Claim
78 words
An electric fuse as specified in claim 1 including a plurality of fusible elements formed by a plurality of substantially equidistantly spaced coreless coaxial helical windings wherein each of said plurality of beads has a plurality of parallel equidistantly spaced passageways, said plurality of windings being threaded through said plurality of passageways in said plurality of beads to positively maintain between said plurality of windings the space prevailing between said plurality of passageways in said plurality of beads.
Claim 6
Dependent Claim
132 words
An electric high-voltage fuse including a. a tubular casing of electric insulating material; b. terminal elements closing the ends of said casing; c. a plurality of coaxially wound coreless fusible elements inside said casing conductively interconnecting said pair of terminal elements; d. a plurality of multibore beads, each of said plurality of fusible elements projecting through one of the bores of said plurality of multibore beads and being positively spaced by said multibore beads; e. a plurality of overlays of a metal-severing low fusing point metal on at least one of said plurality of fusible elements, each of said plurality of overlays being arranged inside a bore of said multibore beads; and f. a pulverulent arc-quenching filler inside said casing positioning said plurality of fusible elements and said plurality of multibore beads.
Claim 7
Dependent Claim
132 words
An electric high-voltage fuse including a. a tubular casing of electric insulating material; b. terminal elements closing the ends of said casing; c. a plurality of coaxially wound coreless fusible elements inside said casing conductively interconnecting said pair of terminal elements; d. a plurality of multibore beads, each of said plurality of fusible elements projecting through one of the bores of said plurality of multibore beads and being positively spaced by said multibore beads; e. a plurality of overlays of a metal-severing low fusing point metal on at least one of said plurality of fusible elements, each of said plurality of overlays being arranged inside a bore of said multibore beads; and f. a pulverulent arc-quenching filler inside said casing positioning said plurality of fusible elements and said plurality of multibore beads.
Claim 8
Dependent Claim
25 words
An electric high-voltage fuse as specified in claim 5 wherein said plurality of multibore beads consist of a melamine resin and an inorganic filler material.
Claim 9
Dependent Claim
116 words
An electric high-voltage fuse including a. a tubular casing of electric insulating material; b. terminal elements closing the ends of said casing; c. a plurality of parallel connected fusible elements inside said casing conductively interconnecting said pair of terminal elements; d. a pulverulent arc-quenching filler inside said casing submersing said fusible elements; e. a plurality of metal-severing low fusing point overlays on each of said plurality of fusible elements; and f. a plurality of beads mounted on each of said plurality of fusible elements each covering one of said plurality of overlays and each consisting of a melamine resin with inorganic fillers having a thermal conductivity in the order of 1/4 of thermal conductivity of steatite.
Claim 10
Dependent Claim
116 words
An electric high-voltage fuse including a. a tubular casing of electric insulating material; b. terminal elements closing the ends of said casing; c. a plurality of parallel connected fusible elements inside said casing conductively interconnecting said pair of terminal elements; d. a pulverulent arc-quenching filler inside said casing submersing said fusible elements; e. a plurality of metal-severing low fusing point overlays on each of said plurality of fusible elements; and f. a plurality of beads mounted on each of said plurality of fusible elements each covering one of said plurality of overlays and each consisting of a melamine resin with inorganic fillers having a thermal conductivity in the order of 1/4 of thermal conductivity of steatite.
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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) | 1977-05-06 | 1977-11-05 | 1978-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-06 | 1981-11-05 | 1982-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-06 | 1985-11-05 | 1986-05-07 | $7700.00 | Window Closed / Lapsed |