US4151237A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of cables with undulated tension relief elements
Assignee: Lynenwerk GmbH and Co KG
•
Filing: 1978-01-06
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Granted: 1979-04-24
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Expires: 1998-01-06
Abstract
Abstract In the production of electric cable in an extruder head having undulated tension relief elements embedded in the jacket, the jacketing material and tension relief elements are introduced at a velocity greater than the cable core, with such velocity being subsequently decreased to provide a compressive force which forms the undulations.
Inventors
- 👤 Robert Ney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:10
CPC Classifications
H; H01; H01B; H01B13/00; H01B13/22; H01B13/24; B; B29; B29C; B29C48/00; B29C48/03; B29C48/06; B29C48/15; B29C48/156; B29C48/05
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
108 words
In the production of electric cable in a cable extruder head wherein a cable core, a jacketing material and tension relief strands are fed into the extruder head to produce a tubular jacket for the core having the tension relief strands embedded in the jacket material, an improved method for providing undulations in said tension relief strands, comprising: forming said undulations by introducing the tension relief strands and the jacketing material into the extruder head at a velocity greater than the velocity of the cable core and thereafter reducing the velocity of the jacketing material having the tension relief strands therein to effect compression and produce said undulations.
Claim 2
Dependent Claim
108 words
In the production of electric cable in a cable extruder head wherein a cable core, a jacketing material and tension relief strands are fed into the extruder head to produce a tubular jacket for the core having the tension relief strands embedded in the jacket material, an improved method for providing undulations in said tension relief strands, comprising: forming said undulations by introducing the tension relief strands and the jacketing material into the extruder head at a velocity greater than the velocity of the cable core and thereafter reducing the velocity of the jacketing material having the tension relief strands therein to effect compression and produce said undulations.
Claim 3
Dependent Claim
29 words
The method of claim 1 wherein the jacketed cable is withdrawn from the extruder head and has a diameter greater than the diameter of the outlet of the head.
Claim 4
Dependent Claim
13 words
The method of claim 2 wherein the tension relief strands are glass fibers.
Claim 5
Dependent Claim
12 words
The method of claim 3 wherein the jacketing material is polyvinyl chloride.
Claim 6
Dependent Claim
31 words
The method of claim 1 wherein the relative velocities of the tension relief strands and jacketing material with respect to the cable core is controlled to control the degree of undulation.
Claim 7
Dependent Claim
19 words
The method of claim 1 wherein the tension relief strands embedded in the jacket are in an untwisted form.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-04-23 | 1982-10-23 | 1983-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-23 | 1986-10-23 | 1987-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-23 | 1990-10-23 | 1991-04-24 | $7700.00 | Window Closed / Lapsed |