Method and apparatus for sheathing cable cores |
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| 申请号 | US37564673 | 申请日 | 1973-07-02 | 公开(公告)号 | US3899824A | 公开(公告)日 | 1975-08-19 |
| 申请人 | PHILLIPS CABLES LTD; | 发明人 | BEACH SHIRLEY M; | ||||
| 摘要 | A method and apparatus for sheathing a cable core with a strip of sheathing material are described wherein the strip is crimped with crimping means to give it inherent longitudinal stretchability, stretched to the point where the crimp is substantially removed so that the longitudinal edges of the strip are of substantially equal effective length; and wrapped about the cable core to form a sheath in which the longitudinal edges of the strip overlap. The method and apparatus seeks to overcome the problems of buckling that arise with sheathing material wherein the longitudinal edges of the material are of different length. | ||||||
| 权利要求 | 1. A method of sheathing a cable core advanced longitudinally, with a flat strip of sheathing material, comprising: advancing said strip and advancing said cable core, crimping said strip to give it inherent longitudinal stretchability, the crimps extending inwardly from the longitudinal edges of the strip, stretching the crimped strip longitudinally to the point where the crimp is removed to substantially the maximum where the longitudinal edges of the strip are of substantially equal effective length and wrapping the strip longitudinally about the cable core to form a sheath in which the longitudinal edges of the strip overlap. 2. A method according to claim 1 wherein said crimping comprises passing the strip between corrugating rolls which introduce corrugations transversely of the strip. 3. A method according to claim 2 wherein the corrugations are such that the strip is reduced in length by the order of 1 to 10 percent of its normal length. 4. A method according to claim 3 wherein the strip is corrugated to the extent of about 5 to 20 corrugations per inch, each corrugation being 3 to 5 thousandths of an inch deep. 5. A method according to claim 1 wherein the sheathing material has a coating of a thermoplastic on at least one side and said cable core with said sheath wrapped around it is passed through a heated tube whereby the heat from the tube softens the thermoplastic material and the overlapping edges of the sheath are bonded together. 6. A method according to claim 5 wherein said tube is disposed adjacent an extruder head adapted to extrude a jacket of protective material around the sheathed cable core, the tube drawing its heat from the extruder head. 7. A method according to claim 6 wherein the strip is a metallic strip coated with polyethylene. 8. Apparatus for sheathing a cable core advanced longitudinally with a flat strip of sheathing material comprising, means for advancing a cable core and means for advancing a strip of sheathing material, means for crimping said strip to give it inherent longitudinal stretchability, with crimps extending inwardly from the longitudinal edges of the strip, means for stretching the strip longitudinally to the point where the crimp is removed to substantially a maximum where the longitudinal edges of the strip are of substantially equal effective length, and sheath forming means for wrapping the strip longitudinally about the cable core to form a sheath in which the longitudinal edges of the sheath overlap. 9. Apparatus according to claim 8 further including a tube through which the sheathed cable core can be passed, so constructed and arranged that heat delivered to said tube is transferred to said sheath. 10. Apparatus according to claim 9 in which the tube is attached to an extruder head of an extrusion apparatus adapted to extrude a jacket of protective material around a sheathed cable, said tube drawing its heat from the extruder head. 11. Apparatus according to claim 8 in which the means for crimping comprise corrugating rolls. 12. Apparatus according to claim 11 wherein the corrugating rolls are adjustable to introduce corrugations varying in depth transversely of the strip. |
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