US3810061A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High-voltage fuse
Assignee: GOLUD INC A DE CORP
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Filing: 1972-12-04
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Granted: 1974-05-07
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Expires: 1992-12-04
Abstract
Abstract A high-voltage fuse having plug terminals a plugged casing, bores in one of the plug terminals, rods removably mounted in the bores of the casing, which form a temporary support for a fusible element wound substantially helically around the aforementioned rods. In the resulting fuse the conventional mandrel of electric insulating or ceramic material generally star-shaped in crosssection is dispensed with. The aforementioned rods are withdrawn when the pulverulent arc-quenching filler filled into the casing provides sufficient support for the long and fragile fusible element or elements. An annular or tubular element of electric insulating material is arranged along the axis of the fuse structure in such a way that it braces the temporary supporting rods for the fusible element or elements against the pressure exerted by the latter, tending to bend said rods radially inwardly. The annular or tubular element may be adapted to perform additional functions.
Inventors
- 👤 E Salzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:03
CPC Classifications
H; H01; H01H; H01H85/00; H01H85/02; H01H85/04; H01H85/041; H01H85/042
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
321 words
A high-voltage fuse including a. a tubular casing of electric insulating material; b. a pair of plug terminals closing the ends of said casing and affixed to the ends thereof, one of said pair of plug terminals having a plugged screw-threaded axial center bore of relatively large diameter in the center thereof and further having a plurality of plugged axial bores of relatively small diameter surrounding said center bore, and the other of said pair of plug terminals having a blind center bore of relatively large diameter in the axially inner end surface thereof and further having a plurality of blind bores of relatively small diameter in the axially inner end surface thereof surrounding said blind center bore, said plurality of bores of relatively small diameter in said one of said pairs of plug terminals and said plurality of blind bores in said other pair of plug terminals being aligned and the lines of alignment thereof defining the locations of edges of a prism; c. a pulverulent arc-quenching filler inside said casing; d. a fusible ribbon element in form of a substantially helical winding wound around said lines of alignment and having ends conductively connected to the axially inner end surfaces of said pair of plug terminals, said fusible element being submersed in said arc-quenching filler and substantially supported by said arc-quenching filler in the absence of a supporting mandrel substantially equal in length to the spacing of the axially inner end surfaces of said pair of plug terminals; and e. at least one insert of electric insulating material inside said winding arranged in axially spaced relation from said axially inner end surfaces of said pair of plug terminals, said insert having a central axial aperture arranged in substantially coaxial relation to said casing and said insert further having surface elements arranged in close proximity to said lines of alignment of said plurality of bores and said plurality of blind bores.
Claim 2
Dependent Claim
321 words
A high-voltage fuse including a. a tubular casing of electric insulating material; b. a pair of plug terminals closing the ends of said casing and affixed to the ends thereof, one of said pair of plug terminals having a plugged screw-threaded axial center bore of relatively large diameter in the center thereof and further having a plurality of plugged axial bores of relatively small diameter surrounding said center bore, and the other of said pair of plug terminals having a blind center bore of relatively large diameter in the axially inner end surface thereof and further having a plurality of blind bores of relatively small diameter in the axially inner end surface thereof surrounding said blind center bore, said plurality of bores of relatively small diameter in said one of said pairs of plug terminals and said plurality of blind bores in said other pair of plug terminals being aligned and the lines of alignment thereof defining the locations of edges of a prism; c. a pulverulent arc-quenching filler inside said casing; d. a fusible ribbon element in form of a substantially helical winding wound around said lines of alignment and having ends conductively connected to the axially inner end surfaces of said pair of plug terminals, said fusible element being submersed in said arc-quenching filler and substantially supported by said arc-quenching filler in the absence of a supporting mandrel substantially equal in length to the spacing of the axially inner end surfaces of said pair of plug terminals; and e. at least one insert of electric insulating material inside said winding arranged in axially spaced relation from said axially inner end surfaces of said pair of plug terminals, said insert having a central axial aperture arranged in substantially coaxial relation to said casing and said insert further having surface elements arranged in close proximity to said lines of alignment of said plurality of bores and said plurality of blind bores.
Claim 3
Dependent Claim
63 words
A high-voltage fuse as specified in claim 1 including a substantially helically wound wire for controlling a blown fuse indicator, said wire being arranged inside of the prismatic space bounded by said lines of alignment and projecting through said central axial aperture in said insert of electric insulating material and spaced by said insert of electric insulating material from said fusible ribbon element.
Claim 4
Dependent Claim
22 words
A high-voltage fuse as specified in claim 1 wherein said insert of insulating material is substantially in the shape of a spider.
Claim 5
Dependent Claim
25 words
A high-voltage fuse as specified in claim 1 wherein said insert of insulating material is substantially in the shape of a short length of tubing.
Claim 6
Dependent Claim
27 words
A high-voltage fuse as specified in claim 4 wherein the radially inner surface of said fusible element engages the outer surface of said short length of tubing.
Claim 7
Dependent Claim
55 words
A high-voltage fuse as specified in claim 4 wherein said short length of tubing consists of a laminate of melamine-glass-cloth and wherein a point of said fusible element is sandwiched between the outer surface of said short length of tubing and a strap of a laminate of melamine-glass-cloth affixed to said short length of tubing.
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) | 1977-05-06 | 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 |