SHRINKABLE TUBES, ETC.

A fusible insert having protuberances on at least one surface is disposed between a heat recoverable sleeve and the substrate over which the sleeve is recovered. The protuberances provide for mechanical engagement between the liner and the sleeve or substrate. When the protuberance has substantially...     

An article and method for preparing wraparound closures for cables, pipes, splices, and junctions to effect repair, insulation, waterproofing and the like are described. The article is a generally rectangular sheet of a plastic material which has the property of shrinking toward its original dimensions...     

Crosslinking, e.g., by irradiation, of a polymer comprising poly(tetramethyleneterephthalate) is made possible by the addition of N,N'-m-phenylenedimaleimide. The resulting crosslinked modified polymer may be rendered heat recoverable.

A heat recoverable closure article and a method for covering a conduit junction having at least three arms. The article comprises a radially heat-shrinkable tubular member, or a member in sheet form having its opposite edge regions held together to form the tubular member. The member includes a heat-shrinkable...     

The outer conductors of two coaxial pairs each is received by slotted axial ends of a sleeve, so that the respective fingers engage the outer conductors, and wherein annular solder on the fingers and in the slots holds the fingers on the conductors and provides bonded connections between the sleeve and...     

A heat recoverable member is disposed about a utility carrier and positioned at least partially within an aperture. The heat recoverable member includes a heat expansible portion disposed within the aperture and a heat shrinkable portion coupled to the heat expansible portion. The heating of the heat...     

Herein is described an article for encapsulating in separate compartments a plurality of elongate substrates. Typically the substrates comprise the union or junction between pair of electrical conductors or similar structures. The article comprises a heat recoverable outer tubular member and an inner...     

A multi-contact interconnector composed of conductive material which is always elastomeric and insulating material which may be elastomeric or not, but should be heat-shrinkable, the two materials being arranged alternately in layers one upon another. The outer periphery of each insulating layer being...     

A heat recoverable article for shielding junctions in cables or conduits comprising a corrugated sheath in part capable of radial deformation disposed within a member of heat-recoverable material part of the sheath having transverse corrugations that resist deformation. A sheath made of conductive material...     

Described herein are self-regulating heating articles. The article comprises a constant wattage layer and a layer that exhibits a positive temperature coefficient of resistance (PTC layer). At its steady state condition, the heater is self-regulated by the switching or anomaly temperature T.sub.s of...     

An article such as a tube formed of heat-shrinkable material is bonded exteriorly or interiorly to an elastomeric member to form a laminated article. The bonding preferably takes place before heating and expanding of the heat-shrinkable tube. After expansion and cooling, the parts remain in the heat...     

An improved process for encapsulating a cylindrical electrical element having lead wires emanating therefrom including the steps of enveloping said element in a heat-shrinkable polymeric tubular member whereby said lead wires extend out through the open ends of said tubular member and heating said tubular...     

An earth tieback comprising a steel tendon rod anchoring a structure to the earth, the tendon rod having double corrosion protection provided first by a thin hard coating of corrosion resistant plastic throughout its length and second by concrete grout over the anchor zone of the rod and by a heat shrunk...     

The invention relates to packing containers formed from shrinkable plastics material of the type in which a plastics blank is shrunk onto a mold to produce a form having a bottleneck shape. The portion so given bottleneck shape has longitudinal and relatively parallel surface pleats. The plastics material...     

A recoverable tubular article comprising an elastomeric sleeve held in a radially expanded or extended condition and capable of recovering to its pre-expanded condition of smaller diameter upon the removal of an outer restraint, an outer restraint, essentially tubular in configuration, bonded to said...     

The invention relates to a novel case for enclosing a short length of at least one elongate substrate, especially a cable splice. The case has a wrap-around body section and end sections comprising deformable sealing members which in use are deformed into a configuration in which an increase in pressure...     

A coupling of heat recoverable metallic material for joining tubular members and other cylindrical substrates. The couplings include a hollow member having at least one opening for receipt of a tube. This hollow member is designed to eliminate relative motion between the ends of the member and the tubing...     

Wrap around closures for cables, pipes, splices, and junctions to effect repair, insulation, waterproofing and the like and a method for preparing such closures are described. The closures comprise generally rectangular sheets of heat shrinkable polymer having a large central section which has been hot...     

A method of making a composite structure comprising an elongate substrate, especially an insulated electrical cable, and a covering member which has been heat-recovered and sealed around the substrate. A heat-recoverable article of a cross-linked crystalline polymer composition which transmits 5-50%...     

A self-regulating heating article comprising a layer of material exhibiting a positive temperature coefficient of resistance (PTC) and said PTC layer having at least partially contiguous therewith at least one layer of constant wattage output material. The article operates such that when connected to...     

Flexible hollow articles comprise an expanded elastomeric inner member and an outer restraining means. The restraining means has score lines thereon, and is made of a notch-sensitive material so that the score lines can be propagated through the material by distorting the article. The stiffness and elongation...     

Hot melt adhesives which are especially suitable for use with heat-recoverable plastics articles such as heat-shrinkable sleeves, wrap-around sleeves and end-caps are based on a combination of selected polyamides of relatively low molecular weight and relatively high amine equivalent, especially those...     

A heat-recoverable sleeve having a meltable or softenable insert inside it, a thermal barrier being located between the sleeve and the insert. The barrier may be crosslinked thermoplastic netting, and the sleeve may be transparent.

An insulated electrical crimp splicer comprising a crimp barrel disposed in an insulating sleeve. The sleeve is adapted to retain the crimp barrel therein but the barrel may be removed from the sleeve to permit crimping of the barrel onto electrical conductors.

An article such as a tube formed of heat-shrinkable material is bonded exteriorly or interiorly to an elastomeric member to form a laminated article. The bonding preferably takes place before heating and expanding of the heat-shrinkable tube. After expansion and cooling, the parts remain in the heat...     

A heat recoverable warp-around closure member comprises a sheet having a pair of elongate parallel spaced-apart profiles that may be interlocked, optionally with internal or external support or fastening means associated with the profiles, when the sheet is wrapped up to form a hollow member. The member...     

Electrical connections to line substrates, such as cables, are made by employing a radially shrinkable coil member which is positioned about the substrate in an expanded form and is then caused or allowed to revert to a smaller radius so that it grips the substrate. In preferred embodiments the coil...     

A dimensionally-recoverable article comprising a hollow resilient member which has been expanded to a dimensionally unstable configuration in which it is retained by a keeper positioned between and separating two parts of the hollow member away from the path of recovery thereof. The keeper is preferably...     

A feedthrough device is provided for sealing a supply line as it passes through an aperture in a wall member such, for example, as the housing of electrical apparatus. The device, which is generally tubular, comprises a first member which is radially inwardly deformable and can be pushed through the...     

A cable splice comprising a metallic sleeve member joining the conductor ends, a layer of adhesive over the sleeve member and adjacent insulation, a helically-wrapped insulation layer formed of a thermosetting polymer, an overlapped layer of fabric surrounding the insulation layer, a helically-wrapped...     

A heat-recoverable wrap-around device made from heat-shrinkable sheet material is provided with mechanical retaining means which co-operate with opposed edge regions of the sheet material so that after recovery about a substrate such as an electrical cable, the device lies substantially flush with the...     

A heat-recoverable article comprises a memory metal member to which has been imparted both thermally-recoverable and resiliently-recoverable strain. The resilient strain is retained by means of a disburdenable keeper, preferably one made from fusible or chemically degradable material, which can be removed,...     

The invention relates to a shrinkable sleeve device easily assembled with a body to be protected thereby. It comprises a dimensionally heat unstable sheet-like portion to embrace the body with unique means for securing edge portions thereof together. The device is particularly advantageous for application...     

In a method of connecting, for example, two coaxial cables, an electrical connection between the outer cable conductors is made by means comprising a hollow dimensionally-recoverable member, solder, and an electrically conductive deformable member at least a part of which is deformed by recovery of the...     

A branch-off seal between a heat-shrinkable sleeve, made for example from a cross-linked polymeric material, and two or more substrates such as electric cables or other utility lines is effected by using a fork member. The end portion of the heat-shrinkable sleeve is threaded between the prongs of the...     

A method of making a composite structure comprising an elongate substrate, especially an insulated electrical cable, and a covering member which has been heat-recovered and sealed around the substrate. A heat-recoverable article of a cross-linked crystalline polymer composition which transmits 5-50%...     

A heat-recoverable article comprises a heat-shrinkable sleeve having an elongate electrical conductor retained therein. The conductor projects from at least one end of the sleeve and at least a portion of the length of the conductor within the sleeve is uninsulated, there being a quantity of solder,...     

A sealing device comprising a hollow body member having a plurality of spaced apart external deformable flanges and provided with a sealant on its external surface, preferably between the flanges. The device may be used to seal a supply line within a duct by pushing it within the duct so that the flanges...     

Electrical insulation for an elongate current carrying body, e.g. an underwater cable for carrying very high voltages, is provided by winding a tape round the body under tension, the tape being made of a film of an axially orientated polymer having a thickness less than 200 microns, and preferably between...     

The invention relates to an article suitable for making an electrical connection between two electrical conductors, for example an earth conductor and the outer conductor of a coaxial cable. The article comprises a heat-shrinkable sleeve and a quantity of solder which is held by and/or on the sleeve,...     

A cable splice comprising a metallic sleeve member joining the conductor ends, a layer of adhesive over the sleeve member adjacent insulation and lead sheath, a helically-wrapped insulation layer formed of a thermosetting polymer, an overlapped layer of fabric surrounding the insulation layer, an overlapped...     

A heat-recoverable wrap-around device is made from heat-shrinkable sheet material, two opposed edges of which may be secured together by fasteners so as to form a sleeve prior to recovery. Each edge region is provided with a strip of rigid material lying generally in the plane of the sheet. The strips...     

The invention relates to an article suitable for making an electrical connection between two electrical conductors, for example an earth conductor and the outer conductor of a coaxial cable. The article comprises a heat-shrinkable sleeve and a quantity of solder which is positioned eccentrically within...     

A method of bracing an article, especially a junction between conduits subject to an internal pressure greater than that of their surroundings, which comprises applying thereto, in the order listed, a gas-impermeable member (this step may be omitted), a reinforcing member and a heat-recoverable member,...     

A method of making an electrical connection between two electrical conductors includes, in addition to making the electrical connection, the steps of positioning the conductors within a heat-shrinkable sleeve whereby they are held, by an insert positioned within the sleeve, in a substantially fixed transverse...     

A method of making a bond structure and a bond structure are provided that produce concurrently a peel bond and a lap bond. One end of a sheet to be joined to a second end of the same or other sheet is folded back on itself and on end of the other member inserted. The two pairs of contacting surfaces...     

Flexible hollow articles comprise an expanded elastomeric inner member and an outer restraining means. The restraining means is made of a notch-sensitive material so that when score lines are made in the restraining means, they can be propagated through the material by distorting the article. The stiffness...     

A protective coating adhered to the surface of a metal substrate such as a pipe using an adhesive composition containing an adhesive component and a polyhydroxy compound protects the substrate from corrosion. The adhesive has improved resistance to cathodic disbonding which generally weakens the adhesive...     

A heat-recoverable article, especially a heat-shrinkable polymeric sleeve, is provided with an inner lining of a continuous metal foil to provide protection against inward water vapor transmission. The lining is preferably aluminium foil having a thickness of from 10 to 25 microns and is thus sufficiently...     

A method of connecting two cables where a reinforcing insulation layer is formed over a connection part of the conductors of the cables. A heat-shrinkable tube is provided on the reinforcing insulation layer by heating the heat-shrinkable tube to form a cable connection part. The cable connection part...     

A heat-shrinkable hollow article having one open end affording access to an internal cavity, the wall defining the internal cavity being shaped to provide stop means projecting into the cavity at a position or positions between the open end and the end of the cavity remote from the open end, whereby...     

A branch-off seal between a heat-recoverable sleeve, such as a tubular or wrap-around sleeve made from cross-linked polymeric material, and two or more substrates such as electrical cables is effected by using one or more clips the outer legs of which are positioned over the outer surface of the sleeve...     

A heat-recoverable article such as a heat-shrinkable wrap-around sleeve is provided with at least one auxiliary conduit so as to facilitate its application to the installation and repair of break-out joints from main-line cables, especially power and telephone cables. The auxiliary conduit is formed...     

An easily removable heat-recoverable closure assembly for a substrate includes a heat-recoverable closure and a flexible wire to be interposed between the closure and the substrate. The wire has sufficient flexibility and sufficient strength that it can be pulled through the wall of the closure for removal...     

Radially shrinkable sleeves for covering joints and terminations in high voltage cables are made by radially uniform machining of an extrudate comprising an insulating layer and at least one other layer which is conductive or semi-conductive or exhibits stress control properties. Expansion of the sleeve...     

An electrical connector comprising a heat-shrinkable sleeve, solder, a solder wettable insert and optionally a pre-installed electrical conductor, in fixed locations in the sleeve, the insert assisting in control of solder flow when the connector is heated to join the conductor to a terminal pin.

A recessed housing and cover are held together by self-tapping screws. The housing is provided with a half round extension having an inner diameter slightly larger than the outer diameter of the cable. The cable insulation is removed to about the middle of the extension and is held tightly to the extension...     

A self-regulating heating article comprising a layer of material exhibiting a positive temperature coefficient of resistance (PTC) and said PTC layer having at least partially contiguous therewith at least one layer of constant wattage output material. The article operates such that when connected to...     

The present invention relates to a device which is used to repair a damaged insulating jacket on an electrical cable. The device is shrunk down around the cable without the use of heat to provide an impervious, protective covering. More particularly, the invention includes a sheet or sleeve which is...     

A recoverable tubular article comprising an elastomeric sleeve held in an expanded or extended condition and capable of recovering to its unexpanded condition of smaller diameter upon the removal of an outer restraint, an outer restraint, essentially tubular in configuration, bonded to said elastomeric...     

A sleeve marker assembly (10, 50) of sleeve markers (11, 53) formed by a base web (12) and top web (13) joined together by transverse seals (16). The base web and top web are of the same width, and two or more rows of spaced longitudinal slits (18, 21, 51 & 52) extend through both webs to define open...     

A recoverable seal for sealing a container, especially an artillery ordinance cannister, comprising a heat-shrinkable continuous annular band having a uniform coat of heat-activatable adhesive on the inwardly-facing surface thereof which has a mean thickness of 0.01 to 1.0 mm and differs from the mean...     

Fastener for a heat-recoverable wraparound sleeve, rigid enough at ambient temperatures to be slid over abutting rails of the sleeve but flexible enough at the recovery temperature of the sleeve to accommodate sharp transitions. The fastening has an elongate member rigid at ambient temperature and flexible...     

A bracing surround which comprises a heat-recoverable especially a heat-shrinkable, sleeve provided with a reinforcing member which does not prevent recovery of the sleeve but which is capable, when in the configuration held when the sleeve is recovered, of resisting forces tending to return it to the...     

A process for the production of a heat-recoverable wraparound closure having a closure means along at least one of a pair of opposed edge regions thereof which includes the steps of fusing together substantially non-cross-linked parts of a polymeric material which is or may be rendered heat-recoverable,...     

A heat-shrinkable cover sheet used for covering and protecting the peripheral surface of a joint of, for example, a steel pipe or cable is provided. The heat-shrinkable cover sheet has two branched tongue-like portions on each of both the ends in the direction of thermal shrinkage. A heating element...     

Disclosed are heat recoverable connectors for use as a protective covering about a plurality of joined articles such as wire splices or tubing junctures. The connectors are open-ended and feature at least one internal wall extending for at least a portion of the distance along the length of the connector...     

A connector device comprises first and second layers of substantially cross-linkable material, the first layer having inserts in contact therewith, the second layer having been expanded and thereafter formed into working and bonding zones, and the sheets being bonded together at the bonding zones for...     

Heat-resistant pressure-sensitive adhesives are used to form the closure of a heat-shrinkable wrap-around sleeve. Suitable pressure-sensitive adhesives include silicone-based adhesives, thermosetting acrylic adhesives, and thermosetting rubber/resin adhesives. However, silicone-based adhesives are not...     

The present invention relates to improved liner constructions, and accordingly provides a cable sleeve liner capable in use of being wrapped around a cable splice and preferably having sufficient rigidity to provide an inner support for a heat-recoverable sleeve to be shrunk thereover, the liner comprising...     

A method for holding together the opposing ends of a flat sheet wrapped around an elongate substrate employs one or more closure devices, each closure device comprising a pair of frictional elements and a means for interengaging same. The frictional elements each have a channel member having a slit and...     

A heat-shrinkable hollow article having one open end affording access to an internal cavity, the wall defining the internal cavity being shaped to provide stop means projecting into the cavity at a position or positions between the open end and the end of the cavity remote from the open end, whereby...     

A device for enclosing at least part of an elongate object, for example a pipe line, comprises a dimensionally recoverable cover 21 one surface of which is partly or wholely coated with a closure adhesive 22 and covered by a layer of sealant. The cover is preferably in the form of a continuous sheet...     

A vacuum circuit breaker having a vacuum bulb comprises a coating of a greasy compound of a water repellent material provided on the outer surface of the bulb, and an insulating tube of a water repellent and heat shrinkable material provided on the coating of the greasy compound.

Disclosed is a closure member for insulating, sealing, waterproofing and otherwise protecting an object from the elements. The closure member is of integral, one-piece construction, is of heat-shrinkable material, has a main body for enveloping the object and easily hand-assembled hooks, formed from...     

A branch-off seal between a heat-recoverable sleeve, such as a tubular or wrap-around sleeve made from cross-linked polymeric material, and two or more substrates such as electrical cables is effected by using one or more clips the outer legs of which are positioned over the outer surface of the sleeve...     

A heat-recoverable sleeve for enclosing splices or joints in pressurized cables or supply lines is given increased resistance to peeling away from the cable or line by insertion of auxiliary means, preferably a U- or V-shaped flexible strip, which may be heat-recoverable, between the sleeve and the cable...     

An electrical heating element material of a sheet form is provided, which is comprised of a web of a synthetic resin having a plurality of metal conductor wires arranged therein in parallel to one another along the longitudinal direction of the web. The web is folded in succession at predetermined intervals...     

A connector device comprises first and second layers of substantially cross-linkable material, the first layer having inserts in contact therewith, the second layer having been expanded and thereafter formed into working and bonding zones, and the sheets being bonded together at the bonding zones for...     

A wrap-around device for enclosing at least part of an elongate substrate such as a pipe comprises a dimensionally-recoverable cover, preferably a dimensionally heat-recoverable cover, having an adhesive closure arrangement comprising two closure portions which can be brought into abutment to form an...     

A clamping member for forming a branch-off seal between a recoverable sleeve and more than one substrate extending from an end of the sleeve, comprises at least two interengageable parts that define channels. The parts are assembled on the end of the sleeve such that the clamping member defines ducts...     

A sealing assembly particularly for cables including an essentially tubular slotted casing formed of thermally shrinkable material having a pair of longitudinal edges with protuberant fastening elements extending in a direction generally longitudinally of said slotted casing being provided adjacent each...     

Articles which are heat-recoverable, or which can be rendered heat-recoverable or which have been heat-recovered, comprise a member composed of a conductive polymer and, attached to said member, at least two electrodes, at least one of which is an electrode comprising a plurality of pliable conductive...     

A re-enterable assembly for protecting and sealing a junction between conduits, comprising a split tube and support means for positioning at each end of the tube, one on each side of the junction. The support means has apertures to provide channels for the conduits, and in one embodiment, is extended...     

A wrap-around device for enclosing an elongate object comprises a cover having two opposed edge portions and that can be interlocked to retain them together. At least one of the edge portions, and preferably both the edge portions, are provided with a protuberance, which extend along the edge portions...     

A device for forming a mechanical and/or electrical connection between a plurality of elongate objects 1, 2, for example bus bars in electrical switchgear, comprises one or more inserts or shell members 9, 10 that can be positioned about the ends of the objects to form a tubular assembly extending between...     

A process for the production of a marker sleeve assembly which comprises deforming a substantially non-cross-linked web of polymeric material at a temperature below the crystalline melting point or softening point of the material to render the web heat-recoverable, fusing together parts of the web or...     

A heat-recoverable closure assembly for enclosing e.g. cable splices comprising a heat-recoverable outer sleeve surrounding a body to be enclosed thereby, a support member surrounding the body and within the sleeve which support member has slotted end portions arranged to be capable of forming a tapering...     

A transversely pleated, longitudinally heat-shrinkable tape is made from a heat-shrinkable polymeric film. One side of the tape may be adhesive-coated, and the other side may be coated with a thermochromic paint. The tape is wrapped around a substrate, and is particularly adapted, by reason of the pleats,...     

Disclosed is contractible conduit sealing connector that features an expanded sleeve made from a heat recoverable metallic material which when exposed to a sufficient amount of heat is able to contract and secure at least two conduits together while at the same time enabling an expandable material contained...     

A snap latch for securing a connector block on a circuit board or like support includes a central portion and prongs extending to either side of central portion. The prongs on one side of the central portion extend through a bore in a circuit board mounting portion to secure the snap latch to the block....     

A heat-recoverable article is formed from a tube of cross-linked polymeric material. Subsequent to cross-linking, spaced-apart portions of the article are welded together to form two separate compartments in the article. The cross-linking and welding are arranged so that the weld is broken by the forces...     

A closure for a telecommunications splice case is provided, which comprises a wraparound sleeve secured for example by a rail and channel closure. Re-entry is achieved by cutting of the old rails and channel and removing a central portion of the sleeve, and shrinking a new sleeve across the butts of...     

Heat shrinkable material comprising a heat shrinkable substrate and a layer of different kinds of adhesives provided on the substrate, which exhibits excellent impact resistance and adhesion properties over a wide temperature range.

A strip heater for wrapping around and applying heat to elongate generally cylindrical objects has a thin, flexible, elongate fiber reinforced base with a uniform width along the majority of its length, resistance wire insulated within the base across a uniform portion of the width of the base and a...     

A split sleeve of a shrinkable material having closure elements comprising projections and apertures for receiving the projections adjacent each edge characterized by the projections being integral tabs which are cut out from a portion of the sleeve and folded along the line inclined to the edge of the...     

Polyamides comprising substantial amounts of Nylon-11 and/or Nylon-12 units are cross-linked by irradiation in the presence of an unsaturated cross-linking agent, preferably triallyl isocyanurate. The cross-linked products are particularly useful in the form of heat-recoverable shaped articles, e.g....     

A thermochromic composition suitable for coating heat-recoverable materials for cable enclosures. The composition contains an organic material which melts and decomposes at a certain temperature by trapping the decomposition products in the composition.

A heat-shrinkable tube is described, which is provided with a compound layer on the inner surface. The compound layer contains a polymerous compound containing an unsaturated bond, and a peroxide. This heat-shrinkable tube is suitable particularly for insulative covering of electronic parts or areas...     

A heat-shrinkable tube is described. The tube is characterized by a resin composition which contains from 5 to 80% by weight of a graft copolymer, and chlorinated polyethylene having a crystal proportion of from 1 to 25%. The graft copolymer is prepared by graft-copolymerizing polyvinyl chloride to an...