Abrégé

The improvement is to a product of the type having a metal strip and a central longitudinal axis, the strip being defined by two or more separate strip parts, the two or more strip parts each: having a common radius of curvature; defining a helix having an angle; being offset from one another in the direction of the axis; and having cross sections such that the strip parts are interlocked together throughout their lengths and such that the strip is interlocked with itself throughout its length to define a flexible metal tube. The improvement comprisies: the outside diameter of the tube being between 3/8" and 1 3/8"; and the helix angle of each strip part being between 8 and 30 degrees.

Classes IPC  ?

• B21C 37/12 - Fabrication de tubes ou de tuyaux métalliques à jonction hélicoïdale
• B21C 37/20 - Fabrication de guides hélicoïdaux ou guides similaires dans ou sur les tubes fabriqués sans enlèvement de matière, p.ex. en étirant le matériau sur des mandrins, en le poussant à travers des matrices
• B21C 37/26 - Fabrication de tubes à ailettes ou à nervures par fixation sur les tubes d'un matériau en bandes ou de présentation analogue de tubes à nervures hélicoïdales
• D07B 1/14 - Cordes ou câbles avec éléments auxiliaires incorporés, p.ex. pour marquage, s'étendant sur toute la longueur de la corde ou du câble
• D07B 7/10 - Dispositifs d'appel ou d'enroulement de la corde ou du câble fini

Abrégé

Apparatus for use with two or more supplies of strip metal comprises, for each supply, a strip feeder and a bending head, the feeder being adapted to receive metal from said each supply and deliver same to the head which is adapted to receive and curl metal from the feeder to produce a strip part encircling a central axis in a coiling manner. The heads and feeders are adapted such that the part axes are coincident and the parts are axially offset from one another, with axially adjacent parts being positioned relative to one another throughout their lengths to define a metal strip which encircles the coincident axes in a coiling manner, the metal strip defining a tubular arrangement which can be used at least for armor cable. The parts can have cross sections such that they interlock throughout their lengths and the strip interlocks with itself throughout its length.

Classes IPC  ?

• B21C 37/12 - Fabrication de tubes ou de tuyaux métalliques à jonction hélicoïdale
• B21C 37/20 - Fabrication de guides hélicoïdaux ou guides similaires dans ou sur les tubes fabriqués sans enlèvement de matière, p.ex. en étirant le matériau sur des mandrins, en le poussant à travers des matrices
• B21C 37/26 - Fabrication de tubes à ailettes ou à nervures par fixation sur les tubes d'un matériau en bandes ou de présentation analogue de tubes à nervures hélicoïdales