DE2652014A1 - HEAT-SHRINKABLE DIVIDED SLEEVE MADE OF PLASTIC - Google Patents

Description

Β4ΤΕΝΜΝΙΛ0ΠΕ ^ BROSE ^{D Ka} BROSE D-8023 Munich-Pullach, Wiunci Jir 2; Tel. (089) ^7ι ) 3 30 7Γ. Irlox ^r > 212l <17 bros d. Cables: -.Patentibus »Munich

Graduate engineer)

Your mark: - "- ^Ta 9 '

Yourrof. 3673 GER . . Date November 15, 1977

COAL INDUSTRY (PATENTS) LIMITED, Hobart House, Grosvenor Place, London SW 1 X 7 AE / England

Heat-shrinkable split sleeve made of plastic

The invention relates to closures, in particular closures for heat-shrinkable split sleeves.

Heat shrinkable split sleeves are known for repair and the protection of objects such as electrical cables, pipes, etc. where the object is long and inaccessible Has ends. Such sleeves can easily be attached to the object, the slot unites and the sleeve can be shrunk by the action of heat on the object. While a number of methods for Performing the bonding has been suggested to remain still problems to ensure that the .connection from · »- sufficiently strong and constrained to withstand the stresses imposed during the shrinkage of the connected sleeve. In many important applications

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the assembled sleeve must also provide an effective barrier to water ingress to the substrate.

The invention provides a heat shrinkable split sleeve Plastic in front with a locking device made of two loose interlocking parts, which is characterized in that one part has a metal finger around the other Part is shaped and prevents loosening of the two parts.

The metal finger and any metal part in the other part are preferably protected by a plastic coating which usually consists of the plastic used to form the sleeve. The coating is done by any usual Process achieved, for example by dipping or powder coating.

In the preferred embodiment of the invention, the Fast and inevitable closure and can result in a connection that is stronger than the sleeve itself.

If the creation of a waterproof connection is desired, an overlapping connection or a semi-overlapping connection can be used Connection to be provided on the sleeve.

Usually the other part is made of metal, which is preferably the metal of the finger. The j other part can be designed as a unit with a; Hole for receiving the punched out or otherwise ' formed therein' finger, or may comprise two or more parts which together form a hole for receiving the finger.

There are usually multiple ¹ deformable fingers and complementary holes. \

i While aluminum is the preferred metal for the malleable;

Finger, can of course, other ^deformable: Metals or alloys are used, such as copper, steel,

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ί tinplate or brass.

·. The sleeve according to the invention can preferably be made of either a PVC or a polyethylene material. In the former case, the sleeve can be made using a plasti-; should be made by dipping. The PVC is preferably plasticized by known blending with a plasticizer. In the latter case, the polyethylene can be extruded to form a sleeve, whereupon it is made heat shrinkable by crosslinking, either using radiation or by chemical means, for example by incorporating an agent such as a peroxide, usually dicumyl peroxide, into the material and by then ^l _ heating to about 14O ° C to initiate crosslinking.

ι \

! In both of the above cases, the plastic can be a homopolymer, a copolymer or a mixture thereof with a! other polymeric material. Optionally, the plastic [may consist of any known plastic having the heat-shrinking properties, such as polypropylene and polyamide.

The two parts of the closure can be molded in one piece with the sleeve or attached after the sleeve is formed j, e.g., by welding using a soluble

Binder or by fusion or rod welding techniques.

The techniques for making heat shrinkable sleeves are well known and generally involve heating the sleeve, expanding it, and cooling it to "freeze" the Sleeve in its expanded dimensions. When exposed to heat, the sleeve returns to its original state return. The sleeve can be placed in an expanded state before or after the closure members are attached thereto are.

The interior of the sleeve is preferably coated with a mastic or sealant, e.g. with a hot melt adhesive,

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to aid in preventing fluid passage when the sleeve is shrunk onto a cable, pipe or other substrate is.

It is contemplated that the following described embodiments may be particularly useful in repairing low pressure gas lines may be applied, although they are in no way limited to such use.

The invention is described with reference to the drawing. In this

shows:

Fig. 1 is a partial plan view of an embodiment of the Invention;

Figure 2 is a section along lines A-A of the embodiment of Figure 1;

Fig. 3 is a partial section of a second embodiment of the invention.

In Figs. 1 and 2, a heat shrinkable split sleeve has made of PVC on a closure device which has a first part 2 with a plurality of fingers 4 having aluminum insert 3 and has a second part 5. The second part 5 also has an aluminum insert 6 which is provided with cutouts 7 is that let the fingers 4 pass through. The use

6 is molded around a copper rod 8 that contains the cutouts

7 closes, albeit the closed cutouts, e.g. by punching from a single sheet of metal forming the insert can be formed. An overlapping finger 9 extends from part 2. All metal parts face an outer PVC coating. The fingers can easily be deformed by hand and bent over the rod 8, whereby the two parts cannot loosen under the stresses of heat shrinkage.

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_ a, · ■ _

In Fig. 3, the same reference numerals designate the same parts as in Figs. 1 and 2. The second closure part 5 does not contain any Metal insert and is = a permanently bent tab made of the PVC material of the sleeve 1. The finger 4 and the tab part 5 extend over the width of the sleeve, while the tongue 4 is slightly deformed inwardly around the flap part 5 to seize and prevent loosening.

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Claims (1)

i claims j (1.J Heat-shrinkable split sleeve made of plastic with a
j Closing device consisting of ^: two loosely interlocking parts, characterized by. that _; '-. one part has a metal finger (4.), which around the
other part (5) is molded and detaching the two
Parts prevented. ; 2. Sleeve according to claim 1, characterized in that the
other part (5) of the device is made of metal. ; 3. Sleeve according to one of the preceding claims, characterized , characterized in that the other part of the device is a: Forms hole (7) through which the metal finger (4)
: can be performed. 4. Sleeve according to claim 3, characterized in that the i device has a plurality of metal fingers (4) and complementary holes (7). \ I 5. Sleeve according to one of claims 1 and 2, characterized in that ' indicates that the other part (5) has a lip; ; which can be brought into engagement with the metal finger (4). , i 6. sleeve according to one of the preceding claims, thereby; i ^! ! indicates that all metal parts are made of plastic i are stratified. ι. .. j { 7. Sleeve according to one of the preceding claims, characterized in that; ; indicates that the metal is aluminum. I. j 8. Sleeve according to one of the preceding claims, characterized in that j (1) made of PVC material i is. 709 821/071 3 26520 H. 9. Sleeve according to one of claims 1 to 7, characterized in that that it (1) is made of crosslinked polyethylene. 10. sleeve according to one of the preceding claims, characterized characterized in that one or both parts (4, 5) are cast in one piece with the sleeve (1). 11. Sleeve according to one of claims 1 to 9, characterized in that that one or both parts (4, 5) according to their Formation to be attached to the sleeve (1). 709821/0713