Rigid/flexible tube

F - Mech Eng,Light,Heat,Weapons – 16 – L

Patent

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Details

F16L 11/04 (2006.01) B29C 47/00 (2006.01) B29D 23/00 (2006.01)

Patent

CA 2073402

A tube is disclosed having alternating relatively rigid and relatively flexible segments formed along its length. The tube wall is formed of overlapping wrappings of a continuous web of thermoplastic material. The thickness of the web is varied to form the rigid and flexible segments. A reinforcing strand of metal or plastic wire is helically coiled along with the web. A method and apparatus are disclosed in which the web is taken up around helically skewed forming rollers. The speed of rotation of the forming rollers or the rate of extrusion of the web is varied to produce the rigid and flexible segments. The reinforcing strand may be a thermoplastic wire formed by extrusion simultaneously with the formation of the tube.

Tube composé de sections relativement rigides et de sections relativement flexibles disposées en alternance sur toute sa longueur. La paroi du tube est formée d'enroulages superposés constitués d'une bande continue de matériau thermoplastique. L'épaisseur de la bande est modifiée pour créer les sections rigides et les sections flexibles. Un brin de renforcement en fil de métal ou de plastique est enroulé en hélice avec la bande. Une méthode et un appareil sont prévus pour entraîner la bande autour de rouleaux de formation hélicoïdaux biseautés. La vitesse de rotation des rouleaux de formation ou le taux d'extrusion de la bande peuvent être modifiés, ce qui permet de produire les sections rigides et les sections flexibles. Le brin de renforcement peut se composer d'un fil thermoplastique formé par extrusion en même temps que la formation le tube.

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