| 摘要 |
PURPOSE: A multi hole tube for an electric and communication cable is provided to reduce a weight of the tube and manufacturing costs by reducing a material by forming a hollow part between a junction part of protection tubes. CONSTITUTION: A multi hole tube(2) is formed by an extrusion molding in a body through a connection part(6) where protection tubes(4) meet, and has a hollow part(8) in a center of the connection part. The multi hole tube comprises a number of protection tubes(4), and is connected with another multi hole tube by a connection socket. There is an extension tube having a larger diameter than the outer shape of the multi hole tube at both sides of each connection part. And a stepped sill is between an end of the connection part and the inside diameter of the extension tube. If the connection socket is inserted into the multi hole tube, a number of protection tubes are inserted into the extension tube and the end of the protection part contacts the inner stepped sill and is connected with the connection tube.
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