Cable sleeve with an entrance socket of shrinkable material

• US 4,438,294 A
• Filed: 01/05/1982
• Issued: 03/20/1984
• Est. Priority Date: 02/11/1981
• Status: Expired due to Fees

• Current Assignee: Siemens AG
• Original Assignee: Siemens AG
• Inventors: Rost, Jan, Meltsch, Hans J.
• Primary Examiner(s): Grimley, A. T.
• Assistant Examiner(s): NIMMO, MORRIS
• Application Number:
  US06/337,295
• Time in Patent Office: 805 Days
• Field of Search: 174/88 R, 174/92, 174/93, 174/DIG. 8
• US Class Current: 174/88.00R
• CPC Class Codes: H02G 15/013 Sealing means for cable inlets inlets for cables filled with, or surrounded by, gas or oil H02G15/32
• CPC Class Codes: Y10S 174/08 Shrinkable tubes

Abstract

An improved sealing element for a cable entrance socket of a cable sleeve characterized by the element being a liner element of a thermoplastic, cross-linked material having a shape memory and being shrinkable to a previous shape when subjected to a shrinking process. The liner element may be either a solid member or a cup-shaped hollow member and may have two or more axially extending, outwardly opening recesses for receiving cables.

Claims

1. In a cable sleeve having a longitudinally extending joint and a cable entrance socket at each end of the sleeve, said cable entrance socket consisting of a shrinkable material and receiving a liner element having an axis and having external axially extending recesses for receiving portions of the cables being introduced into the cable entrance socket, and said socket having sealing material for forming a seal between the material of the socket and sheath of the cable engaged by the cable entrance socket, the improvements comprising the liner element consisting of a thermo-plastic, cross-linked material, said element having a shape memory and being shrinkable toward a previous shape when subjected to a shrinking process.

2. In a cable sleeve according to claim 1, wherein the shape memory for the liner element is such that the recesses will shrink onto portions of the cables introduced therein during the shrinking process and wherein the element is heat shrinkable.

3. In a cable sleeve according to claim 1, wherein the liner element comprises a solid member, said solid member having a shape memory and being heat shrinkable so that the liner element will return to the previous shape during a heat shrinking process.

4. In a cable sleeve according to claim 3, wherein the solid member is formed of a foam material.

5. In a cable sleeve according to claim 1, wherein the liner element comprises a hollow element having at least one side wall extending in the axial direction and being interconnected by a transverse terminating wall extending at substantially right angles to the axial direction to form at least one cup, said side wall being shaped to provide the recesses.

6. In a cable sleeve according to claim 5, wherein the liner element has a pair of side walls each having a recess interconnected by traverse side walls, said side walls with recesses having a cross-section resembling a pair of C-profiles opening opposite to each other with the sides of the C-profiles being interconnected by the traverse side walls.

7. In a cable sleeve according to claim 6, wherein the surfaces of the traverse side walls extend substantially parallel to one another.

8. In a cable sleeve according to claim 6, wherein the traverse side walls are inclined to each other in a direction at right angles to the axial direction.

9. In a cable sleeve according to claim 6, wherein each of the traverse side wall portions have an arcuate cross-section.

10. In a cable sleeve according to claim 6, wherein the liner element have internal bracings extending between the insides of the transverse side wall and the side walls having the C-shaped profile.

11. In a cable sleeve according to claim 5, wherein the liner element has at least three side walls with a cross-sectional shape of C-shaped profiles being arranged to open outward from one another with traverse side walls interconnecting the sides of the C-shaped profile.

12. In a cable sleeve according to claim 5, wherein the liner element has at least three side walls with recesses being arranged around the axis of the liner element to create a star-like cross-sectional shape.

13. In a cable sleeve according to claim 1, wherein each of the recesses has a coating of a plastic adhesive sealing material.

14. In a cable sleeve according to claim 13, wherein the outer surface of the element adjacent said recesses also has a coating of a plastic adhesive sealing material.

15. In a cable sleeve according to claim 1, wherein the outer surfaces of the recesses have coatings of a meltable adhesive.

16. In a cable sleeve according to claim 1, wherein the outer surfaces of the liner element adjacent the recesses have a coating of a meltable adhesive.

17. In a cable sleeve according to claim 1, wherein the outer surfaces of the liner element are provided with axially spaced coatings of a meltable adhesive and an adhesive sealing material so that in the axial direction one goes from one type to the other type of adhesive.

18. In a cable sleeve according to claim 1, wherein the liner elements includes a heat conducting element.

19. In a cable sleeve according to claim 1, wherein at least one of the recesses receives a plug in place of a cable.

20. In a cable sleeve according to claim 1, wherein the material of the cable entrance socket and the liner element are both heat shrinkable materials, and are identical in their behavior with respect to a temperature of the heat shrinking process.

21. In a cable sleeve according to claim 1, wherein the materials of the cable entrance socket and the liner element are each heat shrinkable materials and having different shrinkage behaviors concerning a given temperature.

22. In a cable sleeve according to claim 1, wherein the cable entrance socket is provided with a meltable coating of adhesive and the liner element is provided with a coating of a meltable adhesive, said adhesives melting in different temperature ranges.

23. In a cable sleeve according to claim 1, wherein the liner element is a substantially hollow element having axially extending side walls, with a side wall being curved to form each of said recesses and side walls being interconnected by a terminating wall extending transverse to the axial extending side walls to form an internal cavity and said lining element including a support element received inside of the cavity.

24. In a cable sleeve having a longitudinally extending joint and a cable entrance socket at each end of the sleeve for the introduction of cables into the interior of the sleeve, each socket receiving a sealing element for sealing the space between the cables inserted therein, said socket and sealing element being of a heat shrinkable material the improvements comprising the sealing element being a hollow liner element having at least three interconnected axially extending side walls and being interconnected by a transverse terminating wall extending at substantially right angles to said axial direction to form at least one cup-shaped cavity, some of said side walls being shaped to provide an axial extending outwardly opening recess for each of the cables, said hollow cupshaped liner element being a thermoplastic, cross-linked material, having a shape memory and being heat shrinkable to the previous shape when subjected to a heat shrinking process.

25. In a cable sleeve according to claim 24, wherein said liner element exhibits tapering projections adjacent each of said recesses, said tapering projection when in the shrunken state bridging the transition between the liner element, cable and socket without gradations.

26. In a cable sleeve according to claim 24, which includes sealing material being disposed between the cables, and the liner element as well as between the shrunken socket and the cables.

27. In a cable sleeve according to claim 24, where the liner element fills the triangular areas between the introduced cables and the shrunken socket.

28. In a cable sleeve according to claim 27, wherein the shrunken socket extending along a common tangent connecting two adjacent cables and wherein the liner element has a portion assuming the shape of said common tangent.

29. In a cable sleeve according to claim 24, wherein the side wall containing recesses are connected along the edges by traverse side walls, said traverse side walls having a curved arcuate surface approaching an arc-like tangent extending between the two cables.

30. In a cable sleeve according to claim 24, wherein the transverse terminating wall of the liner element has means for forming an opening for receiving an element extending into the interior of the cable sleeve.

31. In a cable sleeve according to claim 24, wherein the terminating transverse wall is located inward of the ends of the liner element so that a pair of cup-shaped cavities are formed.

32. In a cable sleeve according to claim 24, wherein the transverse terminating wall is positioned adjacent an axial end of the liner elements so that only a single cup-shaped cavity is formed.

33. In a cable sleeve according to claim 24, wherein a plurality of liner elements are packed together to form the sealing elements.

34. In a cable sleeve according to claim 33, wherein the liner elements are disposed to extend parallel to each other.

35. In a cable sleeve according to claim 34, where the plurality of liner elements are disposed to engage with one another with their longitudinal edges.

36. An initial part for manufacturing a liner element for a cable sleeve, said liner part being utilized in a cable introduction socket to seal at least two cables in said socket, said part being a hollow member of a thermo-plastic material being capable of being cross-linked to retain a shape memory, said hollow member having axially extending side walls and a terminating wall extending transverse to the axial direction to form at least one cup shape cavity.

37. An initial part according to claim 36, wherein said part has a rectangular cross-sectional form.

38. An initial part according to claim 36, wherein the part has an essentially rectangular cross-section with each corner being provided with a lip, said lips being arranged in pairs of projecting lips, with each pair of lips and the respective side wall therebetween forming a type of groove subsequently deformable into a recess.

39. An initial part according to claim 36, wherein said part has a triangular cross-sectional form.

40. An initial part according to claim 36, wherein the initial part exhibits an approximate triangular cross-sectional form with the three major side walls being interconnected by a smaller traverse side wall, each of said major side walls having a substantially C-shaped cross-sectional configuration opening outward, said traverse extending side walls and major side walls merging-with triangular shaped lips.