US3652782A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stress relief apparatus for cable connection
Assignee: Furukawa Electric Co Ltd
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Filing: 1969-08-04
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Granted: 1972-03-28
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Expires: 1989-08-04
Abstract
Abstract A tubular body made of an elastomer has conical surfaces at both ends and an axial bore to receive the cable insulation of a sheathed cable, and is provided with a conductive stress cone. A solid support cylinder made of an insulating material has a stress relief electrode embedded therein and exerts an axial compression on the tubular body in cooperation with a clamping member. Owing to the compression, the tubular body is brought into intimate contact with the cable insulation. The arrangement of the stress relief electrode in the support cylinder is such that it comes on an extension of the conical surface of the stress cone. The stress relief electrode is grounded.
Inventors
- 👤 Hisatomo Furusawa
- 👤 Kazuyoshi Inaoka
- 👤 Masahiro Maruyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:08
CPC Classifications
H; H02; H02G; H02G15/00; H02G15/02; H02G15/06; H02G15/064; H02G15/068
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
322 words
A stress relief apparatus in combination with an electrical cable (1) having a solid insuLation (2) on the cable conductor, a shielding layer on said cable insulation and a sheath, said apparatus comprising: a. a tubular body (3) made of an elastic insulating material having an axial bore adapted to be fitted on the cable in contacting relation with said cable insulation and having an outer peripheral surface tapered at both ends into generally conical shapes; b. a stress relief cone (4) made of an elastic conductive material formed integral with said tubular body and having a conical portion and a cylindrical portion, at least a part of said cylindrical portion protruding from one end of said tubular body; c. a conductive member for electrically connecting the cylindrical portion of said stress relief cone to said shielding layer; d. a solid support cylinder (5) made of an insulating material having a conical inner surface corresponding substantially to the conical shape of the other end of said tubular body, and being of a length shorter than said tubular body; e. clamping means (8) having a conical surface corresponding substantially to the conical shape of the one end of said tubular body; f. a means for urging said clamping means against said tubular body to axially compress said tubular body, said elastic tubular body being positioned with respect to said clamping member so that an imaginary cross section line through the stress relief cone passing through the inner transition region between the cylindrical portion of the conical portion thereof will intersect the conical surface of said tubular body in contact with said clamping member, whereby said inner transition region is brought into intimate contact with said cable insulation; and, g. a conductive layer on said cable insulation extending axially so as to electrically connect said shielding layer with the transition region from the cylindrical portion to the conical portion of said stress relief cone.
Claim 2
Dependent Claim
322 words
A stress relief apparatus in combination with an electrical cable (1) having a solid insuLation (2) on the cable conductor, a shielding layer on said cable insulation and a sheath, said apparatus comprising: a. a tubular body (3) made of an elastic insulating material having an axial bore adapted to be fitted on the cable in contacting relation with said cable insulation and having an outer peripheral surface tapered at both ends into generally conical shapes; b. a stress relief cone (4) made of an elastic conductive material formed integral with said tubular body and having a conical portion and a cylindrical portion, at least a part of said cylindrical portion protruding from one end of said tubular body; c. a conductive member for electrically connecting the cylindrical portion of said stress relief cone to said shielding layer; d. a solid support cylinder (5) made of an insulating material having a conical inner surface corresponding substantially to the conical shape of the other end of said tubular body, and being of a length shorter than said tubular body; e. clamping means (8) having a conical surface corresponding substantially to the conical shape of the one end of said tubular body; f. a means for urging said clamping means against said tubular body to axially compress said tubular body, said elastic tubular body being positioned with respect to said clamping member so that an imaginary cross section line through the stress relief cone passing through the inner transition region between the cylindrical portion of the conical portion thereof will intersect the conical surface of said tubular body in contact with said clamping member, whereby said inner transition region is brought into intimate contact with said cable insulation; and, g. a conductive layer on said cable insulation extending axially so as to electrically connect said shielding layer with the transition region from the cylindrical portion to the conical portion of said stress relief cone.
Claim 3
Dependent Claim
24 words
A stress relief apparatus according to claim 1, wherein said tubular body is made of an elastomer having a Shore hardness less than 50.
Claim 4
Dependent Claim
42 words
A stress relief apparatus according to claim 1, wherein an annular stress relief electrode is embedded in said support cylinder in such a manner that it assumes a position in an imaginary extension of the conical surface of said stress relief cone.
References Cited (Backward Citations)
US3517113A
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 |