US3652797A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety anchored multiconductor cable for electric arc furnaces
Assignee: Individual
•
Filing: 1970-08-13
•
Granted: 1972-03-28
•
Expires: 1990-08-13
Abstract
Abstract This multiconductor water-cooled electric arc furnace cable has the majority of its conductors secured within the terminal cup by means of solder. In order to prevent the conductors from dropping out of the terminal cup upon a failure of the water-cooling system causing the solder to melt, two of the conductors are additionally bolted to the inner side of the outer wall of each of the terminal cups. This bolted anchorage prevents the cable from leaving the terminal cup and dropping upon melting of the solder and provides the maximum space for the largest possible central tubular cooling water conduit. It consequently prevents serious damage to the furnace or surroundings and possible injury or deaths of workmen resulting from their coming into contact with the high-voltage high-amperage current thus released, since the conductors still remain connected to the transformer.
Inventors
- 👤 Daniel J Goodman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:54
CPC Classifications
H; H01; H01B; H01B9/00; H01B9/001
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
177 words
A safety anchored electrical cable construction for electric arc furnaces, said construction comprising a multiconductor electric cable having a hose with an array of flexible electrical conductors of the same polarity encased therein and with a tubular liquid coolant conducting conduit extending through the center thereof, an electric arc furnace connection terminal having a furnace connection portion at its forward end and having a cable conductor connection portion extending rearwardly from said furnace connection portion, said cable conductor connection portion having a hollow cylindrical outer wall disposed within said hose in liquidtight relationship therewith and defining a conductor receiving cavity therewithin, the forward end portions of said conductors being disposed within said cavity, a heat-resistant mechanical conductor-clamping device disposed in said cavity in engagement with the forward end portion of one of said conductors and securing the same to the inner side of said outer wall in electrical conducting relationship therewith, and a fusible electrically conducting filler material also disposed in said cavity and electrically connecting said cable conductor end portions to said cable conductor connection portion.
Claim 2
Dependent Claim
177 words
A safety anchored electrical cable construction for electric arc furnaces, said construction comprising a multiconductor electric cable having a hose with an array of flexible electrical conductors of the same polarity encased therein and with a tubular liquid coolant conducting conduit extending through the center thereof, an electric arc furnace connection terminal having a furnace connection portion at its forward end and having a cable conductor connection portion extending rearwardly from said furnace connection portion, said cable conductor connection portion having a hollow cylindrical outer wall disposed within said hose in liquidtight relationship therewith and defining a conductor receiving cavity therewithin, the forward end portions of said conductors being disposed within said cavity, a heat-resistant mechanical conductor-clamping device disposed in said cavity in engagement with the forward end portion of one of said conductors and securing the same to the inner side of said outer wall in electrical conducting relationship therewith, and a fusible electrically conducting filler material also disposed in said cavity and electrically connecting said cable conductor end portions to said cable conductor connection portion.
Claim 3
Dependent Claim
59 words
A safety anchored electrical cable construction, according to claim 1, wherein an additional heat-resistant mechanical conductor-clamping device of similar construction and arrangement to said first-mentioned conductor clamping device is disposed in circumferentially spaced relationship thereto and engages the forward end portion of a second electrical conductor and secures the same to said outer wall in electrical conducting relationship therewith.
Claim 4
Dependent Claim
49 words
A safety anchored electrical cable construction, according to claIm 1, wherein said conductor-clamping device includes a conductor-anchorage member secured to said outer wall and projecting inwardly therefrom into said cavity and wherein means is provided for securing said forward end portion of said one conductor to said conductor-anchorage member.
Claim 5
Dependent Claim
54 words
A safety anchored electrical cable construction, according to claim 3, wherein said forward end portion of said one conductor has a hole therethrough, wherein said conductor-anchorage member passes through said hole, and wherein a locking element is secured to said member on the opposite side of said conductor end portion from said outer wall.
Claim 6
Dependent Claim
40 words
A safety anchored electrical cable construction, according to claim 4, wherein said inwardly projecting member has a threaded portion thereon and wherein said locking element has a correspondingly threaded portion threadedly engaging said threaded portion of said inwardly projecting member.
Claim 7
Dependent Claim
23 words
A safety anchored electrical cable construction, according to claim 1, wherein said filler material surrounds said conductor end portions and said conductor-clamping device.
Claim 8
Dependent Claim
60 words
A safety anchored electrical cable construction, according to claim 6, wherein said filler material substantially fills the space in said cavity between said intermediate conduit and said outer wall and the interstices of the individual wires of said conductor end portions exclusive of the space therein occupied by the individual wires of said conductor end portions and said clamping device.
References Cited (Backward Citations)
US3065290A
Cited
US3127467A
Cited
US3143593A
Cited
US3265803A
Cited
US3456064A
Cited
US3551581A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-03-28 | 1975-09-27 | 1976-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-28 | 1979-09-27 | 1980-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-28 | 1983-09-27 | 1984-03-28 | $7700.00 | Window Closed / Lapsed |