Patent US3693128A successfully refreshed from Google Patents.
US3693128A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Convection cooled fuse
Assignee: GOLUD INC A DE CORP
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Filing: 1970-12-28
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Granted: 1972-09-19
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Expires: 1990-12-28
Abstract
Abstract An electric fuse adapted to be cooled by a flow of cooling medium in axial direction flowing through the center of the fuse, the ribbon fuse links being arranged in close proximity to the radially outer surface of the passageway means for the cooling fluid to maximize the heat exchange between the cooling medium and the ribbon fuse link.
Inventors
- 👤 Philip C Jacobs Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 17:13
CPC Classifications
H; H01; H01H; H01H85/00; H01H85/02; H01H85/47
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
217 words
A convention cooled electric fuse including a tubular casing of electric insulating material; b. means of insulating material defining a fluid passageway arranged inside of and in coaxial relation to said casing; c. a pair of annular terminal elements arranged adjacent the ends of said casing and closing the space bounded by said casing and by said fluid-passageway-defining means; d. a pulverulent arc-quenching filler inside said space; e. ribbon fuse link means within said filler conductively interconnecting said pair of terminal elements and arranged in close proximity to the radially outer surface of said fluidpassageway-defining means to maximize heat flow from said ribbon fuse link means across said fluid-passageway-defining means and to substantially preclude interposition of said filler between said fluid-passageway-defining means and said ribbon fuse link means; f. annular clamping means of electric insulating material having radially inner relatively wide cylindrical surfaces and axially outer relaTively narrow edges surrounding said ribbon fuse link means with said relatively wide cylindrical surfaces thereof, clamping said ribbon fuse link means against the radially outer surface of said fluid-passageway-defining means and precluding access of said filler to portions of said ribbon-fuse-link means coextensive with said radially inner relatively wide cylindrical surfaces of said clamping means while allowing other portions of said ribbon-fuse-link means to be physically engaged by said filler.
Claim 2
Dependent Claim
217 words
A convention cooled electric fuse including a tubular casing of electric insulating material; b. means of insulating material defining a fluid passageway arranged inside of and in coaxial relation to said casing; c. a pair of annular terminal elements arranged adjacent the ends of said casing and closing the space bounded by said casing and by said fluid-passageway-defining means; d. a pulverulent arc-quenching filler inside said space; e. ribbon fuse link means within said filler conductively interconnecting said pair of terminal elements and arranged in close proximity to the radially outer surface of said fluidpassageway-defining means to maximize heat flow from said ribbon fuse link means across said fluid-passageway-defining means and to substantially preclude interposition of said filler between said fluid-passageway-defining means and said ribbon fuse link means; f. annular clamping means of electric insulating material having radially inner relatively wide cylindrical surfaces and axially outer relaTively narrow edges surrounding said ribbon fuse link means with said relatively wide cylindrical surfaces thereof, clamping said ribbon fuse link means against the radially outer surface of said fluid-passageway-defining means and precluding access of said filler to portions of said ribbon-fuse-link means coextensive with said radially inner relatively wide cylindrical surfaces of said clamping means while allowing other portions of said ribbon-fuse-link means to be physically engaged by said filler.
Claim 3
Dependent Claim
43 words
A fuse as specified in claim 1 wherein said fluid-passageway-defining means is of melamine glass-cloth-laminate and wherein said annular clamping means are of a laminate of melamine-glass-cloth, are radially slotted and separate discrete zones of said ribbon fuse link means from said filler.
Claim 4
Dependent Claim
241 words
A convection cooled electric fuse including a. a fuse link support of insulating material defining a fluid passageway open at both ends thereof; b. a pair of terminal plugs arranged in spaced coaxial relation and having central axially extending holes, said fuse link support projecting through said holes beyond the axially outer end surfaces of said pair of terminal plugs; c. a tubular casing of insulating material mounted on said pair of terminal plugs, said fuse link support and said casing jointly defining a toroidal space; d. a body of quartz sand inside said space; e. ribbon fuse link means having a plurality of serially related points of reduced cross-sectional area, said ribbon fuse link means hugging the radially outer surface of said fuse link support and having terminal tabs bent about 90 degrees and abutting against the axially inner end surfaces of said pair of terminal plugs; and g. substantially annular hoop-like clamping means of a synthetic resin-glass-cloth-laminate for maintaining said ribbon fuse link means in physical engagement with the radially outer surface of said fuse link support, said clamping means having radially inner relatively wide cylindrical surfaces immediately adjacent said fuse link means and axially outer relatively narrow edges, and said clamping means being restricted to discrete points of said ribbon fuse link means so as to preclude access of said body of quartz sand to said ribbon fuse link means at other points thereof than said discrete points.
Claim 5
Dependent Claim
241 words
A convection cooled electric fuse including a. a fuse link support of insulating material defining a fluid passageway open at both ends thereof; b. a pair of terminal plugs arranged in spaced coaxial relation and having central axially extending holes, said fuse link support projecting through said holes beyond the axially outer end surfaces of said pair of terminal plugs; c. a tubular casing of insulating material mounted on said pair of terminal plugs, said fuse link support and said casing jointly defining a toroidal space; d. a body of quartz sand inside said space; e. ribbon fuse link means having a plurality of serially related points of reduced cross-sectional area, said ribbon fuse link means hugging the radially outer surface of said fuse link support and having terminal tabs bent about 90 degrees and abutting against the axially inner end surfaces of said pair of terminal plugs; and g. substantially annular hoop-like clamping means of a synthetic resin-glass-cloth-laminate for maintaining said ribbon fuse link means in physical engagement with the radially outer surface of said fuse link support, said clamping means having radially inner relatively wide cylindrical surfaces immediately adjacent said fuse link means and axially outer relatively narrow edges, and said clamping means being restricted to discrete points of said ribbon fuse link means so as to preclude access of said body of quartz sand to said ribbon fuse link means at other points thereof than said discrete points.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-19 | 1976-03-20 | 1976-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-19 | 1980-03-20 | 1980-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-19 | 1984-03-20 | 1984-09-19 | $7700.00 | Window Closed / Lapsed |