Patent EP0210807A2 successfully refreshed from Google Patents.
EP0210807A2
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EP
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Tubular article
Assignee: Raychem Corp
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Filing: 1986-07-18
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Granted: —
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Expires: 2006-07-18
Abstract
Abstract A double-walled article in the form of a tube having a small volume filling of a friction-reducing liquid or solid between its two walls. The article is able to revolve over a substrate by shear between its two walls, to provide environmental or electrical protection.
Inventors
- 👤 Peter Lars Larsson
- 👤 Stephen Edward Sheehan
- 👤 Neil Lawrence Holt
- 👤 Manoochehr Mohebban
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 05:52
CPC Classifications
F; F16; F16L; F16L9/00; F16L9/18; H; H02; H02G; H02G15/00; H02G15/013; F16L47/00; F16L47/20; F16L5/00; F16L5/02; F16L58/00; F16L58/18; F16L58/181; F16L59/00; F16L59/14; F16L59/16; F16L59/18; F16L59/20; H01; H01B; H01B17/00; H01B17/26; H01B17/30; H01B17/303; H01B17/306; H02G15/08; H02G15/18
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
167 words
An article comprising a double-walled tube that can be continuously revolved along an elongate member by relative sliding motion between the two walls of the double wall, substantially without relative sliding motion between a wall adjacent the member and the member, the double wall: (a) defining a closed region between its two walls; (b) having between its two walls a friction-reducing means comprising a solid or a liquid; and (c) comprising an elastomeric material; such that if said liquid is non-setting, the volume of the closed region is such that when the article surrounds a substrate of a size such that its wall adjacent the substrate is under a positive tensile strain the average separation between its walls is less than 10 times its average wall thickness; and the tube being of such a configuration that it will buckle rather than revolve if subjected to an axial compressive force applied between an outer wall at one extreme end and an inner wall at an opposite extreme end.
Claim 2
Dependent Claim
167 words
An article comprising a double-walled tube that can be continuously revolved along an elongate member by relative sliding motion between the two walls of the double wall, substantially without relative sliding motion between a wall adjacent the member and the member, the double wall: (a) defining a closed region between its two walls; (b) having between its two walls a friction-reducing means comprising a solid or a liquid; and (c) comprising an elastomeric material; such that if said liquid is non-setting, the volume of the closed region is such that when the article surrounds a substrate of a size such that its wall adjacent the substrate is under a positive tensile strain the average separation between its walls is less than 10 times its average wall thickness; and the tube being of such a configuration that it will buckle rather than revolve if subjected to an axial compressive force applied between an outer wall at one extreme end and an inner wall at an opposite extreme end.
Claim 3
Dependent Claim
37 words
An article according to claim 1, in which the elastomeric material has a secant modulus at 100% elongation of less than 24.7 Kg per cm 2 (350 psi), and an elongation to break of at least 100%.
Claim 4
Dependent Claim
26 words
An article according to any preceding claim, suitable for providing electrical insulation, in which the elastomeric material has a resistivity of greater than 10 10 ohm.cm.
Claim 5
Dependent Claim
19 words
An article according to claim 3, in which the elastomeric material is substantially non-tracking as defined by ASTM D2303.
Claim 6
Dependent Claim
33 words
An article according to claim 1 or 2, suitable for providing electrical stress grading, in which the elastomeric material has a specific impedance of 10 7 to 10 10 ohm.cm at 60 Hz.
Claim 7
Dependent Claim
36 words
An article according to any of claims 1-3, suitable for providing a conductive layer in a high voltage cable termination or joint, in which the elastomeric material has a resistivity of less than 10 4 ohm.cm.
Claim 8
Dependent Claim
28 words
An article according to any preceding claim, in which the elastomeric material together with the friction-reducing means has an electrical strength of at least 50 kV per cm.
Claim 9
Dependent Claim
35 words
An article according to any preceding claim, in which the elastomeric material has a tear resistance as measured by ASTM D624, Die C, of at least 90 N per cm (40 lb. per linear inch).
Claim 10
Dependent Claim
24 words
An article according to any preceding claim, in which said average separation between its walls is less than 5 times its average wall thickness.
Claim 11
Dependent Claim
26 words
An article according to any preceding claim, in which the friction-reducing means is capable of maintaining lubrication under a pressure gradient of 27 kPa per cm.
Claim 12
Dependent Claim
43 words
An article according to any preceding claim, in which the friction-reducing means comprises a non-newtonian liquid having a viscosity at a shear rate of 1 reciprocal second that is greater than 5 times the viscosity at a shear rate of 100 reciprocal seconds.
Claim 13
Dependent Claim
12 words
An article according to claim 11, in which the liquid exhibits pituity.
Claim 14
Dependent Claim
22 words
An article according to claim 11 or 12, in which the liquid comprises a dilute solution of a high molecular weight polymer.
Claim 15
Dependent Claim
28 words
An article according to claim 13, in which the molecular weight of the polymer is greater than 2 million, and its concentration is less than 5% by weight.
Claim 16
Dependent Claim
26 words
An article according to any preceding claim, in which the friction-reducing means comprises a liquid having a boiling point at 1 bar of greater than 130°C.
Claim 17
Dependent Claim
27 words
An article according to any preceding claim, in which the friction-reducing means comprises a liquid that wets said walls with a dihedral angle of less than 80°.
Claim 18
Dependent Claim
15 words
An article which comprises two substantially concentric double-walled tubes as defined in any preceding claim.
Claim 19
Independent Claim
19 words
A method of covering a substrate, which comprises revolving onto the substrate an article according to any preceding claim.
Claim 20
Dependent Claim
61 words
A method according to claim 17, in which the article is revolved onto an end of the substrate by engaging an inner wall of the tube and said end of the substrate, and applying a compressive axial force between the substrate and an outer wall of the tube at a position less than 7 cm from said end of the substrate.
Claim 21
Independent Claim
31 words
A method of applying a hollow object around a substrate, which comprises interposing between the object and substrate an article according any of claims 1-17, and causing said article to revolve.
Claim 22
Dependent Claim
26 words
A method according to claim 18 or 19, in which the substrate comprises two pipes that are thereby joined by the article or by the object.
Claim 23
Dependent Claim
32 words
A method according to claim 18 or 19, in which the substrate comprises a cable splice or termination that is thereby environmentally or electrically protected by the article or by the object.
Claim 24
Dependent Claim
34 words
A method of forming a duct seal between a duct and a substrate that passes therethrough, which comprises revolving along the substrate to a position within the duct an article according to claim 17.
Claim 25
Dependent Claim
88 words
A kit of parts, which comprise an article according to any of claims 1-17, and one or more of the following: means for cleaning a surface of a cable; a liner that can surround a substrate and over which the double-walled tube can be revolved; a casing that can be secured around the double-walled tube when on the substrate; a branch-off clip; an electrical conductor suitable for providing shield continuity across a splice between 'shielded cables, and a clamp that can restrict revolving action of the double-walled tube.
References Cited (Backward Citations)
No citation records indexed.
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