US4810836A
Expired / Lapsed
US
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Optical fiber-containing insulators
Assignee: NGK Insulators Ltd
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Filing: 1988-03-27
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Granted: 1989-03-07
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Expires: 2008-03-27
Abstract
Abstract Optical fiber-containing insulators each comprises an insulator body having a through hole provided in its central portion and extending along an axial direction thereof, an optical fiber core wire passing through the through hole, an insulating material filled between an inner peripheral surface of the through hole and the optical fiber core wire, and arrangements for preventing the filled insulating material from axially protruding out of the insulator body even at high temperature or spacers for holding the optical fiber core wire at the central portion of the through hole of the insulator body.
Inventors
- 👤 Katsuro Shinoda
- 👤 Toshiyuki Kawaguchi
- 👤 Kazumi Nakanishi
- 👤 Noriyasu Oguri
- 👤 Hiroshi Harada
- 👤 Isao Nakajima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:25
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/44; G02B6/4401; G02B6/4415; G02B6/4416; G02B6/4417; G02B6/442; H; H01; H01B; H01B17/00; H01B17/005
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
68 words
An optical fiber-containing insulator comprising an insulator body having a through hole axially provided in a central portion thereof, an optical fiber core wire passing through the through hole, an insulating material filled between an inner peripheral surface of the through hole and the optical fiber core wire, and means for preventing the filled insulating material from axially protruding out of the insulator body even at high temperatures.
Claim 2
Dependent Claim
68 words
An optical fiber-containing insulator comprising an insulator body having a through hole axially provided in a central portion thereof, an optical fiber core wire passing through the through hole, an insulating material filled between an inner peripheral surface of the through hole and the optical fiber core wire, and means for preventing the filled insulating material from axially protruding out of the insulator body even at high temperatures.
Claim 3
Dependent Claim
48 words
An optical fiber-containing insulator according to claim 1, wherein the protrusion-preventing means is constituted by taper portions, said taper portions each being provided at the inner peripheral surface of the through hole and enlarged axially outwardly from the middle portion to respective opposite ends of the through hole.
Claim 4
Dependent Claim
26 words
An optical fiber-containing insulator according to claim 2, wherein a tapering degree of each of the taper portions is in a range from 0.01 to 0.05.
Claim 5
Dependent Claim
61 words
An optical fiber-containing insulator according to claim 1, wherein the protrusion-preventing means is constituted by the insulating material itself, said insulating material consisting of a non-foamable resin filled at the opposite ends of the through hole and a foamed resin or a combination of a non-foamable resin and a foamed resin filled in the through hole excluding the opposite ends thereof.
Claim 6
Dependent Claim
34 words
An optical fiber-containing insulator according to claim 4, wherein the foamed resin is a material selected from the group consisting of a foamed styrol resin, a foamed polyethylene resin, and a foamed silicone resin.
Claim 7
Dependent Claim
29 words
An optical fiber containing insulator according to claim 4, wherein the non-foamable resin is a material selected from the group consisting of a silicone resin and an epoxy resin.
Claim 8
Dependent Claim
40 words
An optical fiber-containing insulator according to claim 1, wherein the protrusion-preventing means is constituted by taper portions formed at opposite ends of the through hole, said taper portions being enlarged axially outwardly at a tapering angle of 5° to 30°.
Claim 9
Dependent Claim
35 words
An optical fiber-containing insulator according to claim 7, wherein an expansion-absorbing portion is formed by swelling the insulating material axially outwardly from each of the end surfaces of the through hole of the insulator body.
Claim 10
Dependent Claim
29 words
An optical fiber-containing insulator according to claim 7, wherein a thermal expansion buffer portion is formed by filling an inorganic substance into the central portion of the through hole.
Claim 11
Dependent Claim
53 words
An optical fiber-containing insulator according to claim 1, wherein the protrusion-preventing means is constituted by the insulating material itself, said insulating material consisting of gas-tight insulating sealed portions at the opposite ends of the through hole and a buffer portion provided at the central portion of the through hole for absorbing thermal expansion.
Claim 12
Dependent Claim
16 words
An optical fiber-containing insulator according to claim 10, wherein the buffer portion is a hollow space.
Claim 13
Dependent Claim
19 words
An optical fiber-containing insulator according to claim 10, wherein an elastic insulating material is filled in the buffer portion.
Claim 14
Dependent Claim
69 words
An optical fiber-containing insulator comprising an insulator body having a through hole axially provided in a central portion thereof, an optical fiber core wire passing through the through hole, an insulating material filled between an inner peripheral surface of the through hole and the optical fiber core wire, and means for holding the optical fiber core wire at the central portion of the through hole of the insulator body.
Claim 15
Dependent Claim
69 words
An optical fiber-containing insulator comprising an insulator body having a through hole axially provided in a central portion thereof, an optical fiber core wire passing through the through hole, an insulating material filled between an inner peripheral surface of the through hole and the optical fiber core wire, and means for holding the optical fiber core wire at the central portion of the through hole of the insulator body.
Claim 16
Dependent Claim
66 words
An optical fiber-containing insulator according to claim 13, wherein the holding means is constituted by a spacer, said spacer being made of substantially the same material as that of the insulating material, and said spacer having a central through hole through which the optical fiber core wire is passed so that the optical fiber core wire is held in the central portion of the insulator body.
Claim 17
Dependent Claim
36 words
An optical fiber-containing insulator according to claim 13, wherein the spacer has penetrating holes around the through hole through which the optical fiber core wire is passed, said penetrating holes being filled with the insulating material.
Claim 18
Dependent Claim
98 words
An optical fiber-containing insulator according to claim 13, wherein said holding means is constituted by taper portions enlarged axially outwardly at opposite ends of the through hole of the insulator body and porcelain spacers which each have a tapered outer peripheral surface enlarged axially outwardly and a central through hole and which are bonded to said respective taper portions with an inorganic material, the optical fiber core wire being passed through the central holes of the spacers so that the optical fiber core wire is held in the central portion of the through hole of the insulator body.
Claim 19
Dependent Claim
36 words
An optical fiber-containing insulator according to claim 16, wherein the optical fiber core wire is protected by protective tubes attached at the respective central holes of the spacers and arranged around the optical fiber core wire.
Claim 20
Dependent Claim
25 words
An optical fiber-containing insulator according to claim 16, wherein the optical fiber core wire and the porcelain spacers are sealingly bonded with an inorganic material.
Claim 21
Dependent Claim
110 words
An optical fiber-containing insulator according to claim 13, wherein the holding means is a hollow toroidal spacer made of substantially the same material as that of the insulating material, said hollow toroidal spacer being inserted between the inner peripheral surface of the through hole of the insulator body and the optical fiber core wire, and said hollow toroidal spacer having a central hole through which the optical fiber core wire is passed so that the optical fiber core wire is held in the central portion of the through hole of the insulator body, said optical fiber core wire being and sealingly bonded to the insulator body with an inorganic material.
Claim 22
Dependent Claim
145 words
An optical fiber-containing insulator assembly comprising a plurality of insulator bodies each having a through hole axially provided in a central portion thereof, an optical fiber core wire being passed through the through holes of the insulator bodies, an insulating material being filled between inner peripheral walls of the through holes of the insulator bodies and the optical fiber core wire, and a spacer being made of substantially the same material as that of the insulating material, said spacer having a central hole, wherein end surfaces of the adjacent insulator bodies are joined together via the spacer, and the optical fiber core wire is passed through the central hole of the spacer and is sealingly bonded to the insulator bodies with the insulating material, so that the optical fiber core wire is held in the central portions of the through holes of the insulator bodies.
Claim 23
Dependent Claim
145 words
An optical fiber-containing insulator assembly comprising a plurality of insulator bodies each having a through hole axially provided in a central portion thereof, an optical fiber core wire being passed through the through holes of the insulator bodies, an insulating material being filled between inner peripheral walls of the through holes of the insulator bodies and the optical fiber core wire, and a spacer being made of substantially the same material as that of the insulating material, said spacer having a central hole, wherein end surfaces of the adjacent insulator bodies are joined together via the spacer, and the optical fiber core wire is passed through the central hole of the spacer and is sealingly bonded to the insulator bodies with the insulating material, so that the optical fiber core wire is held in the central portions of the through holes of the insulator bodies.
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) | 1992-03-06 | 1992-09-05 | 1993-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-03-06 | 1996-09-05 | 1997-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-03-06 | 2000-09-05 | 2001-03-07 | $7700.00 | Window Closed / Lapsed |