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Removable core for pre-stretched tube

A pre-stretching and inner core technology, which is applied in the installation of cables, thin material processing, cable joints, etc., can solve problems such as troubles, affecting the acceptance of customers' cladding assemblies, and difficulties in the shape of inner core tubes.

Inactive Publication Date: 2005-04-20
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This complicates the fabrication of the sheet
Moreover, the force on the fitting means tends to return the bent sheet to its original planar state; therefore, it is difficult and cumbersome to maintain the tubular form of the inner core when the PST is put on
Finally, the visual effect of the core and PST at the mating device will not meet the requirements of the surrounding structure, which may affect customer acceptance of the cladding assembly formed by the core and PST

Method used

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  • Removable core for pre-stretched tube
  • Removable core for pre-stretched tube
  • Removable core for pre-stretched tube

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0031] A first embodiment of a removable plastic inner core 10 supporting a cold shrink elastic tube 12 is shown in figure 1 middle. The elastic tube 12 is partially cut away to reveal the weakened line structure formed in the hollow core 10 . A cover assembly 14 comprising the removable inner core 10 and the pre-stretched and radially expanded elastic cover tube 12 is placed in a cable splice connecting two cables 16 (not shown for purposes of clarity of illustration). As shown), each cable includes a conductor 18 and an insulating coating 20.

[0032] By removing the hollow core 10, the radially expanding cladding tube 12 is contracted to contact and seal the splice and cable 16 in the peripheral direction. If desired, an insulating glue or an adhesive tape can be placed between the insulating coating 20 of the cable 16 and the elastic coating tube 12 .

[0033] The cold-shrinkable elastic covering tube 12 can be made of an elastic tube that can be expanded to a larger di...

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PUM

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Abstract

A removable inner core (10) for supporting a pre-stretched elastic tube in a radially expanded state, having first and second opposite ends and at least one localized weakening main thread (28), extending from a first It starts at one end (24) and ends at the second end (26) of the tube. The inner core further includes a plurality of substantially parallel localized weakening secondary lines (32). Each secondary line of weakness (32) extends substantially circumferentially from one side of the primary line of weakness (28) to an endpoint spaced from the other side of the primary line of weakness. Adjacent secondary weakening lines (32) form a sliver. The strip begins at the first end of the tube and extends substantially continuously to the second end of the tube.

Description

field of invention [0001] The present invention relates to an inner core for supporting an elastic tube in a radially expanded or pre-stretched state, which core can be removed to allow the pre-stretched elastic tube (PST) to shrink and engage with an object to be enclosed in the tube touch. Furthermore, the present invention relates to a cladding assembly comprising a PST and an inner core for supporting the PST in a radially expanded state. Background of the invention [0002] One method of insulating and providing environmental protection to splices of power cables or other cables is to use a collapsible insulating tube which expands and fits over the outer surface of a hollow cylindrical inner core. Slide the tube and core over one cable end and connect the cable with the connector. The tube and core are then repositioned in the joint area, the hollow cylindrical core is removed, and the expanded insulating tube is contracted and brought into contact with the joint and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02G15/08B29C61/06H02G15/18
CPCB29C61/065H02G15/1826H02G15/1833Y10T428/139Y10T428/15
Inventor E·A·霍普卡斯W·诺尔
Owner 3M INNOVATIVE PROPERTIES CO