Abstract: A tubular covering sleeve (9) is manufactured which comprises a primary tubular body (10) externally coated with a sheath (14) formed of a layer of semiconductive material (15) coupled with an elastomer layer (16). The sheath (14) is made separately of the primary body and subsequently coupled therewith, before or after coupling of the primary body itself on a splicing region between two electric cables (2a, 2b). The sleeve one of the cables before electrically connecting the conductors (3a, 3b). Then a radial shrinkage of the sleeve (9) on the cables (2a, 2b) is caused at the splicing region. To carry out a sectionalisation (18), one end portion of the sheath and of the semiconductive layer (16) alone is turned up or mechanically removed, before or after engagement of the sheath (14) with the primary tubular body (10).

Abstract: A tubular covering sleeve for electric-cable joints is disposed on a supporting element causing radial expansion of said sleeve (2) starting from axially opposite end portions (7a) of the sleeve (2) itself. The tubular sleeve (2) in a radially expanded condition is installed on the supporting element (3). A apparatus (1) for putting into practice the above described method comprises a support (4) for the tubular sleeve (2) and a pair of expanders (10) to be located to a position substantially coaxial with said sleeve (2), each at a respective end (7) of the sleeve (2) itself. Driving means (11) is used for introducing the expanders (10) into the respective sleeve ends (7) and causing radial expansion. The apparatus (1) further comprises devices adapted to dispose the sleeve (2) in a radially expanded condition on the supporting element (3).

Abstract: The present invention relates to a method as well as to a joint assembly (12) for splicing a first and a second eclectic cable (1, 2) by means of a tubular elastic sleeve (15) at a splicing zone (11) between such cables (1, 2), said tubular sleeve (15) being supported in an expanded condition on a removable hollow supporting element (16) detachable in a first supporting portion (17) and a second supporting portion (18).

Abstract: A method of coating the junction area between elongated elements, in particular between electric cables. This method includes the steps of: arranging a rigid tubular support having two axially separable tubular halves; mounting an elastic tubular sleeve in an elastically radially expanded condition on an outer surface of the support; interposing a lubricating material between the support and sleeve; arranging a circumferentially continuous sealing element between the halves to prevent the lubricant from percolating between the halves; positioning the support around the junction area; and moving the halves apart from each other to enable the sleeve to collapse on the junction area. A device for coating the junction area between elongated elements and a method of making the device and a joint for electric cables.

Abstract: The present invention relates to a method for covering an elongate object (11, 12), in particular an electric cable or a pipe. The method comprises the steps of.

Abstract: A process for manufacturing an elastomeric sleeve of a joint for electrical cables. The sleeve has an electric field-control element, an electrical insulating element surrounding the electric field-control element, and at least a semiconductive element having two stress control screens. The process includes providing the electric field-control element and the two stress control screens on a supporting element; introducing the supporting element into a mould provided for moulding the electrical insulating element; filling with the electrical insulating material the space radially external to the electric field-control element and the stress control screens, the step of filling being carried out during the step of introducing; curing the electrical insulating material to obtain the electrical insulating element of the elastomeric sleeve. An apparatus for carrying out the process for manufacturing is also disclosed.

Abstract: A tubular elastic covering (730) for electric components (700), having on the whole predetermined values of mechanical and electric/environmental requirements, in which the mechanical requirements include expandibility and elastic recovery in a radial direction, and electric/environmental requirements comprise resistance to tracking and resistance to solar radiation, characterized in that said covering includes an inner insulating layer (680) and an outer insulating layer (660) coaxial with each other, in superposed relationship and bonded together, made of blends of cross-linked polymeric material, in which the cross-linked blend forming the inner layer has predetermined values of said mechanical requirements and the cross-linked blend forming the outer layer has predetermined values of said electric/environmental requirements.

Abstract: A tubular elastic covering (730) for electric components (700), having on the whole predetermined values of mechanical and electric/environmental requirements, in which the mechanical requirements comprise expandibility and elastic recovery in a radial direction, and electric/environmental requirements comprise resistance to tracking and resistance to solar radiation, characterized in that said covering comprises an inner insulating layer (680) and an outer insulating layer (660) coaxial with each other, in superposed relationship and bonded together, made of blends of cross-linked polymeric material, in which the cross-linked blend forming the inner layer has predetermined values of said mechanical requirements and the cross-linked blend forming the outer layer has predetermined values of said electric/environmental requirements.

Abstract: A tubular elastic covering for electric components is provided to obtain predetermined values of mechanical and electric/environmental requirements. The mechanical requirements include expandibility and elastic recovery in a radial direction. The electric/environmental requirements include resistance to tracking and resistance to solar radiation. The covering includes an inner insulating layer and an outer insulating layer coaxial with each other, in superposed relationship and bonded together. The covering is made of blends of cross-linked polymeric material, in which the cross-linked blend forming the inner layer has predetermined values of the mechanical requirements and the cross-linked blend forming the outer layer has predetermined values of the electric/environmental requirements. This invention also describes a method of making this covering, a termination for electric cables utilizing this covering, and a method of mounting the termination to an electric cable.

Abstract: A storable tubular element for covering an electric cable joint which includes a rigid tubular support with a three layer sleeve having an unstretched bore of a size less than the external diameter of the support mounted on the tubular support in radially stretched condition. The element is usable for a group of cables having several different diameters and the properties and thicknesses of the layers are selected so that with storage on the support, the layers do not tear and so that when the sleeve is applied to a joint, the sleeve will apply the desired pressure to the cable even though it has a temporary residual deformation and does not immediately tend to return to its initial unstretched state.

Abstract: Method for manufacturing an insulating body with a predetermined profile for an electrical device. This method comprises the steps of forming a covering body of cross-linkable polymer material on a supporting element, where said body has a first external profile that comprises the envelope of the predetermined profile; to vulcanize the body; and to create the predetermined profile on the external surface of said body by removing portions of said material. The covering body obtained in monolithic vulcanized polymer material comprises a central element and a plurality of frusto-conical sheds formed on it where the internal conical surface of at least one shed forms an angle of less than 80.degree. with the central element and where the external conical surface of at least one shed forms an angle greater than 110.degree. with said central body.

Abstract: The process calls for extrusion of a multilayer tubular structure with semiconducting innermost layer. In production of the sleeve the inner layer is partially removed leaving only a central portion forming an electrode. In addition the intermediate layer is made with a compound having pre-determined relative dielectric constant and dielectric rigidity.

Abstract: The support is designed to keep in expanded condition an elastic covering sleeve for elongated cylindrical elements such as electric cable joints and the like. The support comprises a tape wound spirally in side-by-side turns so as to take on a cylindrical tubular form and mutual constraint means between the turns to keep the tape in wound condition. In accordance with the invention the tape and the constraint means are provided in different materials.

Abstract: The support is designed to keep in expanded condition an elastic covering sleeve for elongated cylindrical elements such as electric cable joints and the like. The support comprises a tape wound spirally in side-by-side turns so as to take on a cylindrical tubular form and mutual constraint means between the turns to keep the tape in wound condition. In accordance with the invention the tape and the constraint means are provided in different materials.

Abstract: The enclosure assembly, being particularly but not exclusively conceived for use over electric cable splices, comprises a sleeve of an elastomer material, a support whereover the sleeve is fitted in a condition of elastic expansion, said sleeve being adapted to shrink around the elongate cylindrical objects upon removal of the support. The support comprises two substantially cylindrical, tubular bodies having ends abutted coaxially with each other in mutual continuation relationship; the abutted ends are disposed at substantially inward locations of the sleeve longitudinal extension. Thus, the support removal can begin from a predetermined internal region of the sleeve; the sleeve starts shrinking over the splice within said internal region, and any axial deformations in the sleeve would leave the sleeve positioning relatively to said predetermined internal region unaffected.

Abstract: The enclosure assembly particularly, but not exclusively, conceived for spliced electric cables, comprises a sleeve of an elastomer material, a support whereover the sleeve is fitted in a state of elastic expansion, said sleeve being adapted to shrink about the elongate cylindrical objects upon removal of the support. The support comprises a tubular body formed of a strip of a strong flexible material wound into a helix having mutually bonded adjacent turns, the turns being separable by applying a pull force along a substantially longitudinal direction to an end portion of the strip unravelled from the adjacent turns and taken through the interior of the tubular body along a substantially axial direction and out through the opposite end of the tubular body.

Abstract: A covering for a joint between electric cables, an element including such covering for forming a covered joint and a joint obtained with such covering. The covering includes two radially elastic sleeves of cross-linked polymeric material, one sleeve being inside and co-axial with the other sleeve. In the unassembled state, the diameter of the bore of the outer sleeve is less than the diameter of the outer surface of the inner sleeve so that when assembled, the outer sleeve exerts radially inward pressure on the inner sleeve. Each sleeve may be formed of one or more tubular layers of polymeric material.

Abstract: An electric covering for a joint between a pair of electric cables, a device including such covering in elastically expanded condition on a rigid tubular support and electric cable joints including such covering. The covering includes at least two elastic sleeves of cross-linked polymeric material, a first radially inner sleeve at least partly of insulating material and a second radially outward sleeve. To permit the covering to be elastically expanded and encircling the rigid support for a long period of time, e.g. two years, the two sleeves have different mechanical properties and in particular, the material of the second sleeve has a residual deformation, which is applied by elongation over a period of time, which is less than the residual deformation, similarly applied, to the material of the first sleeve.

Abstract: A process and an apparatus to make composite insulators, consisting of a central core (3) provided with an insulating coating (4) of elastomeric material, for electric overhead lines. The apparatus comprises a base structure (6) to which a first and a second end pieces (5a, 5b) of the core (3) are respectively fastened by a bracket (7a), and two injection mould halves (8a) designed to be moved close to each other. Mounted to the base structure (6) are at least two forming mould halves (9a, 9b) arranged to define a filling housing (9c) around the core (3). An injection nozzle (11) communicates with a conveying hollow space (12) coaxial with the central core (3), which is formed between the injection mould halves (8a) and a containing sleeve (13) mounted on the second end piece (5b).

Abstract: A storable covering element for electric cable joints which includes a tubular support on which a multi-layer sleeve is mounted in radially stretched condition, a cable joint with such a sleeve and a sleeve for such use. The sleeve has an inner layer of cross-linked polymeric material which has a temporary residual deformation after storage for at least 24 months at room temperature which is less than such deformation of the layers outwardly thereof and preferably has a modulus of elasticity greater than the modulus of elasticity of the layers outwardly thereof. The outer layers are also made of cross-linked polymeric material, and each layer is bonded to the adjacent layer so that the inner layer will pull the outer layers radially inwardly when the sleeve is applied to a cable joint.