WO1993003527A1

WO1993003527A1 - Method for spacing and sealing articles and spacing member used in the method

Info

Publication number: WO1993003527A1
Application number: PCT/KR1992/000034
Authority: WO
Inventors: Byung Kwan Jung; Jong Ho Lee; Jong Chul Choi
Original assignee: Goldstar Cable Co., Ltd.
Priority date: 1991-07-29
Filing date: 1992-07-29
Publication date: 1993-02-18
Also published as: JP2670187B2; JPH07507437A; KR960008365B1; EP0597011A1; KR930003481A

Abstract

The spacing member comprises a cylinder which has a plurality of longitudinal surfaces and the same number of arched reception grooves between the surfaces, the longitudinal surfaces and arched reception grooves being applied with thermosensitive adhesive, and which is tapered toward the front end thereof. The method comprises inserting the spacing member into a heat-shrinkable sleeve which is applied with thermosensitive adhesive to the inner surface thereof, inserting cables between the heat-shrinkable sleeve and the arched reception grooves, respectively, and heating the end of sleeve to a given temperature to shrink the end and melt the thermosensitive adhesive applied to the spacing member and sleeve, thereby allowing the end of sleeve including the cables to be spaced and sealed. The spacing member can be used for various numbers of cables and may be made of metal, plate or crosslinkable plastic.

Description

D E S C R I P T I O N

METHOD FOR SPACING AND SEALING ARTICLES AND SPACING MEMBER USED IN THE METHOD

BACKGROUND OF THE INVENTION

Field of the Invention

The present invention relates to a method for spacing and sealing articles and a spacing member used in the method, and more particularly to a method for spacing and sealing at least two articles such as cables in a heat- shrinkable sleeve by providing a spacing member for spacing the articles each other.

Description of the Prior Art

Generally, heat-shrinkable products have been extensively used to insulate and seal communication cables, power cables, etc. Upon heating, this kind of heat-shrinkable products usually tend to be restored to the original shapes out of deformed shapes so that the sleeves are capable of carrying out insulation and sealing of articles. However, heat- shrinkable products used in the present invention may also include another kind of products which tend to be deformed out of the original shapes by heating.

As heat-shrinkable sleeves, pipe type heat-restoring heat-shrinkable sleeves and plate type wrap around heat- shrinkable sleeves are recently developed and used. Both of the heat-shrinkable sleeves have applications different from each other. The former, that is, the pipe type heat- restoring heat-shrinkable sleeves are . suitable to connection and termination of wire cables and pipes and preferably used in sealing and connection of cables having long length and small diameter, and the latter, that is, the plate type wrap around heat-shrinkable sleeves are suitable to relatively large diameter cables each of which has end adapted to be separated or to be replaced when it is difficult of access to the end.

There have been proposed many known spacing members which are adapted to space two and more cables each other in heat-shrinkable sleeves in which each of the spacing members is engaged with the heat-shrinkable sleeves to divide the inner space of the heat-shrinkable sleeves into two and more sub-spaces. Thereafter, the resulting heat- shrinkable sleeves each receives a cable therein and is heat-shrunken by heating, thereby allowing the cables to be spaced each other and sealed. The known spacing members generally are clip type plates and typical examples thereof are illustrated in Figs. 15 to 18.

Referring to Fig. 15, there is shown a spacing member 100 which comprises a "E"-shaped clip type plate. The spacing member 100 comprises a pair of outer legs 101 and 101' and an inner supporting leg 102 so that two gaps are provided between the inner leg 102 and the outer leg 101, and between the inner leg 102 and the outer leg 101', respectively. Also, the spacing member 100 is formed with two holes which are located at the inner ends of the gaps. Accordingly, two edges 106 are provided between the holes and the inner surfaces of outer legs 101 and 101', respectively. The inner leg 102 is applied to both sides thereof with thermosensitive adhesive which is melted by heating.

Referring to Fig. 16, there is shown the spacing member 100 of Fig. 15 which is engaged with an end of heat- shrinkable sleeve 104_ As shown in Fig. 16, the heat- shrinkable sleeve 104 is applied with thermosensitive adhesive 105 at the inner surface thereof. The spacing member 100 is engaged with the sleeve 104 in such a manner that the outer legs 101 and 101' are- disposed to the opposite outer surfaces of end of the heat-shrinkable sleeve 104 and the inner leg 103 is interposed in the heat- shrinkable sleeve 104. Therefore, the inner space of the heat-shrinkable sleeve 104 is divided into two sub-spaces by the spacing member 100. Two cables 111 (see Fig. 18) are inserted in the sub-spaces of heat-shrinkable sleeve 104, respectively. Thereafter, as the resulting end of heat- shrinkable sleeve 104 including the spacing member 100 is heated, the end of heat-shrinkable sleeve 104 is gradually shrunken and the thermosensitive adhesive applied to the both sides of inner leg 102 and the inner surface of heat- shrinkable sleeve 104 is melted, thereby causing the cables 111 to be sealed in the heat-shrinkable sleeve 104. In the known spacing member 100, however, since the sharp edges 106 of the spacing member 100 are contacted with the outer surface of heat-shrinkable sleeve 104, the heat-shrinkable sleeve 104 may be torn by the sharp edges

106 when the heat-shrinkable sleeve 104 is shrunken. In addition, since the cross section of sub-spaces of the sleeve 104 has irregular elliptical shapes rather than round shapes due to being engaged with the spacing member 100, sealing for the cables can not be effectively achieved. Fig. 17 shows another example of known spacing member

107 different from that of Fig. 15 which is adapted to space and seal three cables. The spacing member 107 comprises three outer legs 108, 108' and 108" and a central inner leg 109 located among the outer legs 108, 108' and 108". The outer legs 108, 108' and 108" are radially extended at same angular intervals, respectively. Similarly to the spacing member 100 shown in Fig. 15, three gaps are provided between the inner leg 109 and the outer legs 108, 108' and 108", respectively. Also, the spacing member 107 is formed with three holes which are located at the inner ends of the gaps respectively so that three e >es 110 are provided between the holes and the inner- surfaces of outer legs 108, 108' and 108", respectively. The inner leg 109 is applied with thermosensitive adhesive 103. When the spacing member 107 is' engaged with the heat-shrinkable sleeve 104, the outer legs 108, 108' and 108" are disposed to the outer surface of sleeve 104 and the inner leg 109 is interposed in the sleeve 104. However, the heat- shrinkable sleeve 104 may also be torn by the sharp edges 110 when the heat-shrinkable sleeve 104 is shrunken by heating.

SUMMARY OF THE INVENTION

The present invention has been made in view of the above-described problems of the prior art and an object of the invention is to provide a method for spacing and sealing articles such as cables and a spacing member used in the method in which the spacing member can be commonly used in pipe type heat-restoring heat-shrinkable sleeves as well as plate type wrap around heat-shrinkable sleeves, can be used for various numbers of cables, and also may be made of metal, plate or cross-linkable plastic so that it can he selectively used in response to various kinds of cables, and which the spacing member can cause cables to be easily spaced and sealed without any damage of heat- shrinkable sleeve.

In accordance with the present invention, the object mentioned above can be accomplished by providing a spacing member comprising a cylinder which has a plurality of longitudinal surfaces and the same number of arched reception grooves between the surfaces, the longitudinal surfaces and arched reception grooves being applied with thermosensitive adhesive, and which is tapered toward the front end thereof and a method comprising: inserting the spacing member into a heat-shrinkable sleeve which is applied with thermosensitive adhesive to the inner surface thereof; inserting cables between the heat-shrinkable sleeve and the arched reception grooves, respectively; and heating the end of sleeve to a given temperature to shrink the end and melt the thermosensitive adhesive applied to the spacing member and sleeve, thereby allowing the end of sleeve including the cables to be spaced and sealed.

Also, in order to indicate that the thermosensitive adhesive is sufficiently melted v a heat-shrinkable sleeve when the sleeve is heated, the spacing member is coated with thermo-color indicating agent on the front surface thereof. The spacing member may have the three, four, six, eight arched reception grooves, etc. so that the spacing member may be used to space out and seal three or more articles.

BRIEF DESCRIPTION OF THE DRAWINGS

These and other objects, features and advantages of the invention will become more apparent upon a reading of the following detailed specification and drawings, in which:

Fig. 1 is a perspective view showing a spacing member according to the present invention;

Fig. 2 is a perspective view showing the spacing member of Fig. 1 which is applied with thermosensitive adhesive;

Fig. 3 is a perspective view showing another embodiment of a spacing member according to the invention;

Fig. 4 is an exploded perspective view showing still another embodiment of a spacing member according to the invention;

Fig. 5A is a cross-sectional view of a heat-shrinkable sleeve in which the spacing member according to the invention and cables are received before shrinking the sleeve; Fig. 5B is a view similar to Fig. 5A after the sleeve has been shrunken;

Fig. 6 is a cross-sectional view of a plate type spacing member which has been shrunken by shrinking of a heat-shrinkable sleeve; Fig. 7 is a perspective view showing a further embodiment of a spacing member according to the invention:

Fig. 8A is a perspective view of the spacing member shown in Fig. 7 before shrinking a heat-shrinkable sleeve; Fig. 8B is a perspective view of the spacing member shown in Fig. 7 after shrinking a heat-shrinkable sleeve; Fig. 9 is a perspective view showing a still further embodiment of a spacing member according to the invention; Fig. 10 is a perspective view showing another embodiment of a spacing member according to the invention; Fig. 11 is a perspective view showing still another embodiment of a spacing member according to the invention; Fig. 12 is a perspective view showing a further embodiment of a spacing member according to the invention; Fig. 13 is a perspective view showing a still further embodiment of a spacing member according to the invention; Fig. 14A is a perspective view showing a spacing member according to the invention to which a locating means is fixed;

Fig. 14B is a perspective view showing the spacing member including the locating means is inserted in a heat- shrinkable sleeve; Fig. 14C is a perspective view showing the spacing member of Fig. 14B in which the heat-shrinkable sleeve is shrunken and the locating means is detached from the spacing member;

Fig. 15 is a perspective view showing an embodiment of a known spacing member;

Fig. 16 is a perspective view showing the spacing member of Fig. 15 which is engaged with a heat-shrinkable sleeve;

Fig. 17 is a perspective view showing another embodiment of a known spacing member; and

Fig. 18 is a cross-sectional view of the spacing member of Fig. 17 which is engaged with a heat-shrinkable sleeve.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

The present invention will now be further- described by referring to the accompanying drawings.

Referring to Fig. 1 , there is shown an embodiment of a metallic spacing member 1 according to the present invention. The spacing member 1 comprises a cylinder having a substantially round cross section. The cylindrical spacing member 1 includes a pair of arched reception grooves 3 and 3' for receiving articles such as cables 111 and 111' at opposite sides thereof so that the spacing member 1 has a double sector-shaped cross section. The spacing member 1 has an upper longitudinal surface 2 and a lower longitudinal surface 2'. Accordingly, since the spacing member 1 which has received a pair of cables 111 and 111' has a substantially elliptical cross section, sealing between the spacing member 1 including the cables 111 and 111' and a heat-shrinkable sleeve can be effectively achieved.

The spacing member may be made of heat conductive material or polymer such as plastic material. Alternatively, the spacing member may be made of metal such as aluminum and alloy thereof. In some cases, it may be preferable to make the spacing member of cross-linkable plastic material such as polyethylene.

A spacing member made of, for example, aluminum can be prepared by a diecasting and then grinding in order to remove its sharp edge portions. A spacing member made of steel can be prepared by a molding. The spacing member may be subsequently subjected to a grinding treatment, if required.

Such spacing members as mentioned above are also preferred to be subjected to a rustproof treatment. For example, the aluminum spacing member is coated with a black oxide coating or an epoxy resin coating to form a chromium layer thereon, in order to protect it from a damage.

In case that each cable has two wires, such a coating provides an effect of electrically insulating the two wires. In the spacing member 1 shown Fig. 1, assuming that the radii of the cables 111 and 111' are r. and r« , respect vely, and distance between the two centers of the cables 111 and 111' is L, an arbitrary point P on an ellipse defined by the upper and lower longitudinal surfaces 2 and 2' is preferable to satisfy the following equation representative of a locus corresponding to the ell pse, when L > r_{ + r_? :

= 1 a^£ b-

L + r. + r, L + ^rj ^{+ r}. where, a = , r, < b <

Also, The arbitrary point P may be preferable to satisfy the following equation representative of an approximate linear locus:

- r. (r. - r,) (L + r, - r« ) y = x + r, -

2L

In util zing the above equations, when radii of two cables 111 and 111' are equal to each other, that is, when r_j = r_?, it is preferable for the point P to have the highest absolute value at the distance of L/2. Differently from the above case, when radi of two cables 111 and 111' are different from each other, that is, when n = r₂, the point P may have the highest absolute value at the larger side.

It is preferable that radii of curvature of the arched reception grooves 3 and 3' are equal to radii of the cables 111 and 111 ^τ, respectively, or lager than radii of the cables 111 and 111' by the range of 5% to 10%.

Value of L is proportional to value of radius of curvature of elliptic arc R defined by the upper and lower longitudinal surfaces 2 and 2'. It is preferable that value of radius of curvature of elliptic arc R is as large as possible.

The spacing member 1 is tapered such that a front end 4 thereof is widened toward a rear end 5 in radius and width. The reason that the spacing member 1 is tapered as described above is to prevent the spacing member 1 from being removed from the distal end of a heat-shrinkable sleeve 104(see Fig. 8B) by milk off phenomenon after the heat-shrinkable sleeve 104 is shrunken.

Referring to Fig. 2, there is shown the spacing member 1 to which thermosensitive adhesive 103 is applied. Preferably, the thermosensitive adhesive layer 103 is applied to at least one of the reception grooves 3 and 3' and the longitudinal surfaces 2 and 2' in order to effectively stick the spacing member 1 to the heat- shrinkable sleeve 104. Accordingly, the cables 111 and 111' can be positively stuck and fixed in the arched reception grooves 3 and 3'. The reception grooves 3 and 3' have rough surfaces, preferably waffled pattern surfaces so that the reception grooves 3 and 3' can maintain a portion of the thermosensitive adhesive 103 thereon when the thermosensitive adhesive 103 is melted by heating.

Preferably, the longitudinal surfaces 2 and 2' of the spacing member 1 have smooth surfaces so that the spacing member 1 can be slid in the heat-shrinkable sleeve 104 when the heat-shrinkable sleeve 104 is shrunken.

Referring to Figs. 3 and 4, there are shown another spacing members 6 and 7 modified from the spacing member 1 shown Fig. 1. The spacing member 6 shown Fig. 3 is prepared by bending a plate material into a given shape and the spacing member 7 shown Fig. 4 is prepared by diecasting so that the spacing members 6 and 7 have cavities therein respectively, thereby causing the spacing members 6 and 7 to be substantially lightened in weight. The spacing members 6 and 7 may be used to space small diameter cables each other. The spacing member 6 which is prepared by bending a plate material may be used to only space out cables each other rather than to seal a end of heat-shrinkable sleeve 104. Similarly, the spacing member 7 which is prepared by diecasting may be also used to space out cables each other. In addition, the spacing member 7 is provided at front end thereof with a plug 8 for closing up the front end opening, if desired. The spacing members 6 and 7 also have longitudinal surfaces 2 and 2' and arched reception grooves 3 and 3'. The spacing members 6 and 7 are also tapered toward front ends 4, respectively, as in the spacing member 1 shown Fig. 1. The spacing members 6 and 7 may be applied with thermosensitive adhesive 103 thereon. The plug 8 is applied with thermo-color indicating agent to the front surface thereof.

Referring to Figs. 5A and 5B, there are shown the spacing members according to the present invention which are inserted in a heat-shrinkable sleeves, wherein the sleeve 104 shown in Fig. 5A is not shrunken but the sleeve 104 shown in Fig. 5B is shrunken. The heat-shrinkable sleeve 104 is applied to the inner surface thereof with thermosensitive adhesive 105 for sealing the heat- shrinkable sleeve 104.

As the heat-shrinkable sleeve 104 including the spacing member 1 and the cables 111 and 111' is heated, the end of heat-shrinkable sleeve 104 is gradually shrunken and the thermosensitive adhesives applied to the longitudinal surfaces 2, 2^T and the reception grooves 3, 3' of the spacing member 1 and the inner surface of heat-shrinkable sleeve 104 are melted and sufficiently filled between the inner surface of sleeve 104 and the spacing member 1 including the cables 111 and 111'. Accordingly, it can be seen that the end of heat-shrinkable sleeve 104 is effectively sealed and the cables 111 and 111' are positively spaced out each other after the sleeve 104 is shrunken.

Referring to Fig. 6, there is shown the spacing member 6 prepared by bending a plate material which is inserted in the heat-shrinkable sleeve 104 together with the cables 111 and 111' after the sleeve 104 is shrunken. From the drawing, it can be seen that the cables 111 and 111' are effectively spaced out each other but the end of heat- shrinkable sleeve 104 is not sealed. The spacing member 6, as shown in Fig. 3, is suitable to only spacing out the cables 111 and 111' each other.

Referring to Fig. 7, there is shown a plastic spacing member 9 which may be made of cross-linkable plastic material such as polyethylene. As in the spacing member 1 shown in Fig. 1, the plastic spacing member 9 is also provided with reception grooves 3 and 3' and longitudinal surfaces 2 and 2', and applied with thermosensitive adhesive 103 at the reception grooves 3 and 3' and the surfaces 2 and 2' thereof. In addition, the spacing member 9 is applied with thermo-color indicating agent 112 at the front surface thereof.

The spacing member 9 is manufactured in such a manner that cross-linkable material such as polyethylene is extruded into a desired shape and then extended longitudinally. If the spacing member 9 prepared by the process mentioned above is heated, it is shrunken in its length and widened in its cross section owing to a generation of force making it be restored to its original state. The extension is preferably carried out at a predetermined extension rate which corresponds to an extension ratio such as 2:1, 3:1, 4:1 or 5:1.

Referring to Figs. 8A and 8B, there are shown the spacing members 9 shown in Fig. 7 which are inserted in a heat-shrinkable sleeves 104 together with cables 111 and 111', wherein the sleeve 104 shown in Fig. 8A is not shrunken but the sleeve 104 shown in Fig. 8B is shrunken. From the drawings, it can be seen that the spacing member 9 is shortened in length after heating treatment.

\^'o explain it more concretely, after the spacing member 9 is inserted into the end of heat-shrinkable sleeve 104 and the cables 111 and 111' are seated in the reception grooves 3 and 3' respectively, the end of heat-shrinkable sleeve 104 is heated to a temperature of about 100 - 200°C(that is, the sleeve 9 is heated when the thermo-color indicating agent 112 applied to the front surface 4 of the spacing member 9 is changed in color). Upon heating, the spacing member 9, which had been previously lengthened longitudinally, is shrunken and restored to its non- deformed original shape, thereby causing the spacing member 9 to be shortened in length and extended in cross section. Therefore, the end of heat-shrinkable sleeve 104 has increased pressure therein by shrinking of the end of sleeve 104 and the thermosensitive adhesives 103 and 105 applied to the spacing member 9 and the inner surface of the sleeve 104 are melted and flows between the cables 111, 111' and the spacing member 9, thereby allowing the cables 111 and 111' to be spaced out each other and the end of heat-shrinkable sleeve 104 to be sealed effectively.

With reference to Fig. 9, there is shown a plastic spacing member 10 according to a still further embodiment of the present invention. In this case, the spacing member 10 is made of foam plastic material. When the spacing member 10 is heated in the sleeve 104, it is melted and also foamed so that it forms cells or foams between at least two cables 111, 111' and the sleeve 104, thereby densely filling between the cables 111, 111' and the sleeve 104 with the cells or foams. Upon subjected to a heating treatment after insertion into the heat-shrinkable sleeve ' 104 together with the cables 111 and 111', the spacing member 10 made of foam plastic material is temporarily or permanently foamed in the inner space of the sleeve 104 and the thermosensi ive adhesive 105 applied to the inner surface of sleeve 104 is melted, thereby achieving an effective sealing and spacing between the cables 111 and 111'. It is preferable that the spacing member 10 shown in the drawing is used for small diameter heat- shrinkable sleeves. Referring to Figs. 10 to 13, there are shown another embodiments of spacing members according to the invention. The spacing members 11, 12, 13 and 14 have reception grooves 3 for receiving three cables(Fig. 10), four cables(Fig. 11), six cables(Fig. 12) and eight cables(Fig. 13), respectively.

Accordingly, the spacing members 11, 12, 13 and 14 can space and seal three or more cables.

As in the spacing member 1 shown in Fig. 1, the spacing members 11, 12, 13 and 14 are tapered toward the front surface 4 and provided with longitudinal surfaces 2 and reception grooves 3. The spacing members 11, 12, ^ 3 and 14 are also applied with thermosensitive adhesive 103 at the longitudinal surfaces 2 and reception grooves 3 thereof and thermo-color indicating agent 112 at the front surface thereof. The spacing members 11, 12, 13 and 14 may be easily prepared of metal or plastic material.

With reference to Figs. 14A to 14C, there are shown locating means 16 which is adapted to be used with the spacing members according to the invention. The locating means 16 has a cross shape consisting of two crossed bars. The locating means 16 is provided with a through hole at the intersected point of the two bars. The spacing member 1 is formed with a threaded hole 15 at the center of the front surface 4 thereof.

In using the locating means 16, the locating means 16 is aligned with the threaded hole 15 of the spacing member 1. A screw 17 is fitted to the threaded hole 15 through the hole of locating means 16. The spacing member 1, to which the locating means 16 is fixed, is inserted into the end of heat-shrinkable sleeve 104 and properly positioned at the center of inner space of the sleeve 104 by engaging the ends of locating means 16 with the end of heat- shrinkable sleeve 104. Thereafter, the cables 111 and 111' are inserted into the sleeve 104 along the reception grooves 3. Upon heating the end of sleeve 104, the end of sleeve 104 is shrunken and the thermosensitive adhesive 103, 105 is melted to seal the end of sleeve 104. After sealing of the end of sleeve 104 and spacing out of the cables 111 and 111' are completed, the locating means 16 may be removed from the spacing member 1 by releasing the screw 17.

As apparent from the above description, since the spacing member according to the present invention comprises a cylinder having two or more longitudinal surfaces and arched reception grooves between the longitudinal surfaces which is tapered toward the front end thereof, the spacing member can be used for various numbers of articles and can be commonly used in pipe type heat-restoring heat- shrinkable sleeves as well as plate type wrap around heat- shrinkable sleeves. Also, since the spacing member has not any sharp edge portions and is completely inserted in a heat-shrinkable sleeve, the sleeve can not be torn when the sleeve is shrunken.

Although the preferred embodiments of the invention have been disclosed for illustrative purpose, those skilled in the art will appreciated that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.

Claims

WHAT IS CLAIMED IS:

1. A method for spacing and sealing cables comprising: inserting a spacing member, which comprises a cylinder having a plurality of longitudinal surfaces and the same number of arched reception grooves between the surfaces, the longitudinal surfaces and the arched reception grooves being applied with thermosensitive adhesive, and which is tapered toward the front end thereof, into a heat- shrinkable sleeve which is applied with thermosensitive adhesive to the inner surface thereof; inserting the same number of cables between said heat- shrinkable sleeve and said arched reception grooves, respectively; and heating said end of sleeve to a given temperature in order to shrink the end and melt the thermosensitive adhesive applied to the spacing member and sleeve, thereby allowing the end of sleeve including the cables to be spaced and sealed.

2. A spacing member for spacing and sealing cables comprising a cylinder which has a plurality of longitudinal surfaces and the same number of arched reception grooves between the surfaces, the longitudinal surfaces and the arched reception grooves being applied with thermosensitive adhesive, and which is tapered toward the front end thereof.

3. A spacing member according to Claim 2, in which, if radii of two cables are r, and r, , respectively, and distance between the two centers of the cables is L, an arbitrary point P on an ellipse defined by the longitudinal surfaces satisfies the following equation, when L > r. + r_. : = 1

' __2

L + r, + r₂ L + ^r1 ^{+ r}2 where, a = , r, < b <

or,

(r, - r,) (L + r, - r.) y x + H "

2L

4. A spacing member according to Claim 2, in which radii of curvature of said arched reception grooves are equal to radii of cables or lager than radii of cables by the range of 5% to 10%.

5. A spacing member according to Claim 2, in which said longitudinal surfaces is substantially rounded surfaces to be effectively sealed.

6. A spacing member according to Claim 2, in which said arched reception grooves have waffled pattern surfaces to maintain a portion of the thermosensitive adhesive when the adhesive is heated and melted.

7. A spacing member according to Claim 2, in which said spacing member is prepared of heat conductive material by a diecasting or molding.

8. A spacing member according to Claim 2, in which said spacing member is prepared of polymer such as polyethylene by extrusion.

9. A spacing member according to Claim 8, in which said polyethylene is cross-linkable material.

10. A spacing member according to Claim 8, in which said spacing member is extended into a given length after extrusion.

11. A spacing member according to Claim 8, in which extension rate of said spacing member is 2:1, 3:1, 4:1 or 5:1.

12. A spacing member according to Claim 8, in which said polymer is plastic consisted of melting adhesive.

13. A spacing member according to Claim 12, in which said melting adhesive is temporarily or permanently foamed in response to heating.

14. A spacing member according to Claim 2, in which said spacing member has three, four, six or eight reception grooves.

15. A spacing member according to Claim 2, in which said spacing member is provided with a cross-shaped locating means at the front surface thereof in order to be precisely positioned in a sleeve.