PROTECTIVE TUBE FOR COMMUNICATION CABLE AND COMMUNICATION WIRE

WIPO Patent Application WO/2004/055835

A1

A protective tube for communication cables and communication wires in which anti-bending effect is enhanced such that the communication cables can be bent easily up to a specified bending radius with a small force but a large force is required for bending them furthermore. The protective tube is passed over communication cables (10, 10A) where communication wires (11, 11A) are protected in loose state by sheaths (13, 13A) composed of two or more synthetic resin layers or is passed over communication wires. The hardest resin layers (13a, 13aA) of the sheaths (13, 13A) are provided with sliced or spiral annular grooves (14) or cuts (14A) made continuously in the longitudinal direction to reach the inside diameter face. The outermost layers of the sheaths (13, 13A) are formed of protective layers (13b, 13bA) of resin softer than that of the hard resin layers (13a, 13a). When the communication wires (11, 11A) are bent, adjacent edge parts (14a, 14aA) of the annular grooves (14) or the cuts (14A) touch each other to block bending of the communication wires to below a specified bending radius.

SAKABE ITARU
TANJI HISASHI
KAKII TOSHIAKI
ISHIKAWA HIROKI
HAMADA KAZUAKI
AKASAKA NOBUHIRO

PCT/JP2003/016041

July 01, 2004

December 15, 2003

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SUMITOMO ELECTRIC INDUSTRIES (JP)

G02B6/44; H01B7/17; H01B11/00; H02G3/04; (IPC1-7): H01B7/18; G02B6/44; H01B11/00; H02G3/04

WO1993009457A1

1993-05-13

JPS6077214U	1985-05-30
JPH0340822U	1991-04-19
JP3028504U	1996-09-03
JPS63100910U	1988-06-30
JPH11223752A	1999-08-17
JPH01164895A	1989-06-28

Miyakoshi, Noriaki (12th Floor ARK Mori Building, 12-32, Akasaka 1-chom, Minato-ku Tokyo, JP)

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