Helical Support and Method for the Production Thereof

Abstract

A helical support for radially supporting an elastically expanded insulating tube includes an extruded body consisting of a plurality of windings extending substantially parallel to each other. Each of the windings is at least partially connected at lateral edges thereof in a longitudinal direction of the helical support. The lateral edges are separably connected by at least one laser weld seam.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic illustration a helical support according to an embodiment of the invention.

FIG. 2 is a schematic sectional illustration of detail A from FIG. 1.

FIG. 3 is a schematic sectional illustration of an alternative embodiment of detail A from FIG. 1.

FIG. 4 is a schematic illustration of an alternate embodiment of a weld seam of detail B from FIG. 1.

FIG. 5 is another alternative embodiment of the weld seam of detail B from FIG. 1.

FIG. 6 is a further alternative embodiment of the weld seam of detail B from FIG. 1.

FIG. 7 is a schematic illustration of a device according to the invention for producing the helical support.

FIG. 8 is a schematic illustration of a tube arrangement according to the invention shown with the helical support from FIG. 1.

FIG. 9 is a schematic sectional illustration of an extruded body from FIG. 2.

FIG. 10 is a schematic sectional illustration of an alternative embodiment of the extruded body from FIG. 2.

FIG. 11 is a schematic sectional illustration of another alternative embodiment of the extruded body from FIG. 2.

Claims

1. A helical support for radially supporting an elastically expanded insulating tube, comprising: an extruded body consisting of a plurality of windings extending substantially parallel to each other, each of the windings being at least partially connected at lateral edges thereof in a longitudinal direction of the helical support, the lateral edges being connected by at least one laser weld seam.

2. The helical support of claim 1, wherein the lateral edges have projections that mate with recesses in the lateral edges of the adjacent windings.

3. The helical support of claim 1, wherein the windings substantially overlap in the longitudinal direction.

4. The helical support of claim 1, wherein at least one lateral edge of each of the windings is provided with a transparent portion, the transparent portion being transparent to laser light.

5. The helical support of claim 4, wherein at least one lateral edge of each of the windings is provided with a melting portion, the melting portion being capable of absorbing laser light.

6. The helical support of claim 5, wherein the melting portion is enhanced with pigment, glass fibers, mica, or chalk.

7. The helical support of claim 5, wherein the transparent portion at least partially overlaps the melting portion.

8. The helical support of claim 7, wherein the laser weld seam is formed where the transparent portion at least partially overlaps the melting portion.

9. The helical support of claim 1, wherein the lateral edges are separable from each other at the laser weld seam.

10. The helical support of claim 1, wherein the laser weld seam is between an inner circumferential surface and an outer circumferential surface of the helical support.

11. The helical support of claim 1, wherein the laser weld seam bridges a winding gap between the adjacent windings.

12. A production device for producing a helical support for radially supporting an elastically expanded insulating tube, comprising: a holding device having an outer circumferential face for receiving an extruded body, the holding device being rotatable about a longitudinal axis thereof;at least one pressure roller positioned adjacent to the holding device for receiving the extruded body there between, the pressure roller exerting pressure on the outer circumferential face of the holding device; anda laser welding device moveable relative to the holding device.

13. A method for producing a helical support for radially supporting an elastically expanded insulating tube, comprising: winding a plurality of windings from an extruded body substantially parallel to each other to form the helical support; andwelding lateral edges of the adjacent windings at least partially to each other along a longitudinal direction of the helical support with laser light to form a laser weld seam.

14. The method of claim 13, wherein the lateral edges are welded as the plurality of edges are wound.

15. The method of claim 13, wherein the windings are seperable from one another at the laser weld seam.

16. The method of claim 13, further comprising introducing ultrasound into the windings.

17. The method of claim 13, further comprising at least partially gluing or mechanically securing the lateral edges to each other.

18. The method of claim 13, wherein the laser weld seam is formed between an inner circumferential surface and an outer circumferential surface of the helical support.

19. The method of claim 13, wherein the laser weld seam bridges a winding gap between the adjacent windings.

20. The method of claim 13, wherein, at least one lateral edge of each of the windings is provided with a transparent portion, the transparent portion being transparent to laser light.

21. The method of claim 20, wherein at least one lateral edge of each of the windings is provided with a melting portion, the melting portion being capable of absorbing laser light.

22. The method of claim 21, wherein the transparent portion at least partially overlaps the melting portion.

23. The method of claim 22, wherein the laser weld seam is formed where the transparent portion at least partially overlaps the melting portion.