EP0422567A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Storable coating element for electric cable joints to be applied to several cables having different diameters, in which the inner layer has a low residual deformation
Assignee: Pirelli and C SpA
•
Filing: 1990-10-08
•
Granted: —
•
Expires: 2010-10-08
Abstract
Abstract The invention relates to a storable coating element for electric cable joints, to be applied to many cables having different outer diameters, comprising a tubular support (11) and a sleeve (10) fitted thereon and comprised of one or more coaxial layers at least one of which is an electrically insulating layer (10b), consisting of compounds made of polymeric cross-linked materials, which sleeve is fitted over said tubular support (11) under conditions of elastic radial expansion, wherein the sleeve layers are integrally linked to each other and only the compound of the innermost layer (10a) in the cross-linked state has a reduced instantaneous residual deformation which is substantially lower than that of the other layers (10b, 10c) located externally relative to it; conveniently the modulus of elasticity of the inner layer (10a) of the sleeve (10) is higher than that of the outer layers (10b, 10c).
Inventors
- 👤 Ubaldo Vallauri
- 👤 Francesco Portas
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 07:20
CPC Classifications
H; H02; H02G; H02G15/00; H02G15/08; H02G15/18; H02G15/184; B; B29; B29C; B29C61/00; B29C61/06; B29C61/0608; B29C61/0616; H02G15/182; H02G15/1826
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
131 words
A storable coating element for electric cable joints, to be applied to several cables (1, 2) having different outer diameters, comprising a tubular support (11) and a sleeve (10) fitted over it and consisting of several coaxial layers, at least one (10b) of which is electrically insulating, made of compounds formed with polymeric cross-linked materials, which sleeve (10) is fitted over said tubular support (11) under conditions of elastic radial expansion, characterized in that the sleeve layers (10a, 10b, 10c) are integrally linked together and in that at an imposed expansion maintained for at least 24 months at room temperature the compound of the innermost layer (10a) exhibits, in the cross-linked state, an instantaneous residual deformation substantially lower than that of the layers (10b, 10c) located more externally relative to it.
Claim 2
Dependent Claim
131 words
A storable coating element for electric cable joints, to be applied to several cables (1, 2) having different outer diameters, comprising a tubular support (11) and a sleeve (10) fitted over it and consisting of several coaxial layers, at least one (10b) of which is electrically insulating, made of compounds formed with polymeric cross-linked materials, which sleeve (10) is fitted over said tubular support (11) under conditions of elastic radial expansion, characterized in that the sleeve layers (10a, 10b, 10c) are integrally linked together and in that at an imposed expansion maintained for at least 24 months at room temperature the compound of the innermost layer (10a) exhibits, in the cross-linked state, an instantaneous residual deformation substantially lower than that of the layers (10b, 10c) located more externally relative to it.
Claim 3
Dependent Claim
60 words
A storable coating element for electric cable joints according to claim 1, characterised in that the compound of the innermost layer (10a) at the cross-linked state exhibits an instantaneous residual deformation lower than 15% in connection with an imposed expansion of 50%, maintained for at least 24 months at room temperature or, alternatively, for at least 40 days at 65°C.
Claim 4
Dependent Claim
41 words
A storable coating element for electric cable joints according to claim 1, characterised in that the compound of the innermost layer (10a) has a modulus of elasticity at least as great as that of the layers (10b, 10c) located more externally.
Claim 5
Dependent Claim
60 words
A storable coating element for electric cable joints according to claim 3, characterised in that the innermost layer (10a) has a radial thickness lower than 25% of the overall thickness of the sleeve (10) and is formed with a compound having a modulus of elasticity as great as 1.5 times the modulus of the layers located more externally (10b, 10c).
Claim 6
Dependent Claim
60 words
A storable coating element for electric cable joints according to claim 3, characterised in that the compound of the innermost layer (10a) has a modulus of elasticity included between 0.5 and 10 MPa and the compounds of the layers (10b, 10c) located more externally relative to it have a modulus of elasticity in the range of 0.03 to 6 MPa.
Claim 7
Dependent Claim
55 words
A storable coating element for electrical cable joints according to claim 5, characterised in that the compound of the innermost layer (10a) has a modulus of elasticity included between 1 and 5 Mpa and the compounds of the outer layers (10b, 10c) have a modulus of elasticity in the range of 0.5 to 3 MPa.
Claim 8
Dependent Claim
35 words
A storable coating element for electric cable joints according to claim 1, characterised in that the sleeve layers (10a, 10b, 10c) are made of elastomeric materials having chemical affinity therebetween, preferably coextruded and/or jointly cross-linked.
Claim 9
Dependent Claim
147 words
A storable coating element for electric cable joints comprising an electrical and mechanical connection (8) between the conductors (3) of two cables (1, 2) and a coating sleeve (10) for the connection (8) itself, fitted over said connection and in contact with the insulating coatings of the cables (1, 2) in a condition of elastic radial expansion, which sleeve (10) is formed with several coaxial layers (10a, 10b, 10c) one of which at least is an electrically insulating layer (10b), consisting of compounds made of cross-linked polymeric materials, characterised in that the sleeve layers (10a, 10b, 10c) are integrally linked together and that at an imposed expansion maintained for at least 24 months at room temperature the compound of the innermost layer (10a) exhibits, in the cross-linked state, an instantaneous residual deformation substantially lower than that of the layers (10b, 10c) located more externally relative to it.
Claim 10
Dependent Claim
147 words
A storable coating element for electric cable joints comprising an electrical and mechanical connection (8) between the conductors (3) of two cables (1, 2) and a coating sleeve (10) for the connection (8) itself, fitted over said connection and in contact with the insulating coatings of the cables (1, 2) in a condition of elastic radial expansion, which sleeve (10) is formed with several coaxial layers (10a, 10b, 10c) one of which at least is an electrically insulating layer (10b), consisting of compounds made of cross-linked polymeric materials, characterised in that the sleeve layers (10a, 10b, 10c) are integrally linked together and that at an imposed expansion maintained for at least 24 months at room temperature the compound of the innermost layer (10a) exhibits, in the cross-linked state, an instantaneous residual deformation substantially lower than that of the layers (10b, 10c) located more externally relative to it.
Claim 11
Dependent Claim
61 words
A joint for electric cables according to claim 8, characterised in that the compound of the innermost layer (10a) of the sleeve (10) in the cross-linked state has an instantaneous residual deformation lower than 15% in connection with an imposed expansion of 50%, maintained for at least 24 months at room temperature or, alternatively, for at least 40 days at 65°C.
Claim 12
Dependent Claim
40 words
A joint for electric cables according to claim 8, characterised in that the compound of the innermost layer (10a) of the sleeve (10) has a modulus of elasticity as great as that of the layers (10b, 10c) located more externally.
Claim 13
Dependent Claim
61 words
A joint for electric cables according to claim 10, characterised in that the innermost layer (10a) of the sleeve (10) has a radial thickness lower than 25% of the overall thickness of the sleeve (10) and is formed with a compound having a modulus of elasticity as great as 1.5 times the modulus of the layers (10b, 10c) located more externally.
Claim 14
Dependent Claim
56 words
A joint for electric cables according to claim 10, characterised in that the compound of the innermost layer (10a) of the sleeve (10) has a modulus of elasticity included between 0.1 and 1.5 MPa and the compounds of the outer layers (10b, 10c) have a modulus of elasticity in the range of 0.05 to 0.5 MPa.
Claim 15
Dependent Claim
56 words
A joint for electric cables according to claim 10, characterised in that the compound of the innermost layer (10a) of the sleeve (10) has a modulus of elasticity included between 1 and 5 MPa and the compounds of the outer layers (10b, 10c) have a modulus of elasticity in the range of 0.5 to 3 MPa.
Claim 16
Dependent Claim
32 words
A joint for electrical cables according to claim 10, characterised in that the sleeve layers (10a, 10b, 10c) are made of elastomeric materials having chemical affinity therebetween. preferably co-extruded and/or jointly cross-linked.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.