Integral corrugated jacket pipe and method of producing the same

Details Integral corrugated jacket pipe and method of producing the same Integral corrugated jacket pipe and method of producing the same

1999-07-02

2000-06-27

Brinson, Patrick

Pipes and tubular conduits

Flexible

Corrugated

138110, 138156, 138128, 174 92, 174724, F16L 1100, H02G 304

Patent

active

060794518

DESCRIPTION:

BRIEF SUMMARY
The invention relates to a one-piece enveloping corrugated pipe and a method for the manufacture of same. Enveloping corrugated pipes of the generic type serve, among other purposes, for the protection of electric lines in the automotive industry.
EP 0 114 213 A (corresponding to U.S. Pat. No. 4,513,787) teaches an enveloping corrugated pipe of plastic material which has a lateral longitudinal slit and, along this longitudinal slit, is provided with a locking or snap-in closing mechanism detachably connecting the two edges of the slit. This envloping corrugated pipe can be produced without any problem technologically; a disadvantage resides in the fact that the closed enveloping corrugated pipe, i.e. with its snap-in locking mechanism closed, has a preferred bending direction which is perpendicular to the axis of the pipe so that it can be opened when bent.
A lengthwise slit enveloping corrugated pipe is known from EP 0 291 418 A, which is provided with radially projecting webs in the vicinity of its longitudinal slit, a locking sleeve being pushed over the webs. This is not a one-piece enveloping corrugated pipe, and as a two-piece pipe it is difficult to mount. At right angles to the axis of the pipe, it has a preferred bending direction which is of disadvantage when the pipe is placed.
A one-piece enveloping corrugated pipe which has a longitudinal slit is known from WO 94/11663. In the vicinity of the slit, the corrugated section is provided, on one side of the slit, with a locking projection, to which a locking recess on the corrugated section is allocated on the other side of the longitudinal slit. The manufacture of such an enveloping corrugated pipe is rather complicated, the more so since the locking parts have to be worked mechanically after extrusion.
A two-piece enveloping corrugated pipe is known from EP 0 268 869 B 1, consisting of two pipe sections which each have tapered corrugated sections. Mounting these two pipe sections is difficult. After the assembly, the tapered corrugated sections rest within the corrugated sections not tapered. Manufacture and mounting are complicated; however the disadvantages of the slit corrugated pipes described above can thus be avoided.
It is the object of the invention to embody a one-piece enveloping corrugated pipe of simple structure and to specify a method that can easily be put into practice.
In a one-piece enveloping corrugated pipe, this object is attained by the features of claim 1. The two corrugated partial sections lie radially one upon the other and mesh, this producing proper interlocking in the vicinity of the divide, i.e. of a cutting plane. This provides for reliable splash protection.
The development according to claim 2 helps ensure that the enveloping corrugated pipe has no or only a negligible preferred bending direction. The further development according to claim 3 ensures that superposed corrugated partial sections cannot be pulled apart in the peripheral direction. So interlocking is available also in the peripheral direction. This interlocking also works when the pipe is bent, it being precluded during the bending of a pipe that the meshing corrugated partial sections are pulled apart in the peripheral direction. The further development according to claim 4 helps prevent the presence of sharp edges inside the enveloping corrugated pipe which might lead to damages of the electric lines disposed in the enveloping corrugated pipe. The further development according to claim 5 ensures that the corrugated pipe does not have any projections or sharp edges externally either.
Further advantages and features of the invention will become apparent from the ensuing description of an exemplary embodiment of the invention, taken in conjunction with the drawing, in which
FIG. 1 is a lateral longitudinal view of a corrugated pipe that constitutes an intermediate product;
FIG. 2 is a cross-section through the corrugated pipe corresponding to the section line II--II of FIG. 1;
FIG. 3 is a cross-section through the corrugated pipe corresponding to the se

REFERENCES:
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patent: 5967194 (1999-10-01), Martin
patent: 6014988 (2000-01-01), Gagnon et al.

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