Abstract: A product having a metal strip and a central longitudinal axis. The strip has 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. A cross section of the strip parts causes them to be interlocked together throughout their lengths to define a flexible metal tube. The outside diameter of the tube is between ?? and 1?? and the helix angle of each strip part is between eight and thirty degrees.

Abstract: A product having a metal strip and a central longitudinal axis. The strip has 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. A cross section of the strip parts causes them to be interlocked together throughout their lengths to define a flexible metal tube. The outside diameter of the tube is between ?? and 1?? and the helix angle of each strip part is between eight and thirty degrees.

Abstract: 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.

Abstract: The product is of the type having a metal strip encircling a central longitudinal axis in a coiling manner, the strip defining a tubular arrangement, the tubular arrangement having a groove defined by the edges of the strip. The improvement in the product comprises: a yarn secured to the tubular arrangement, encircling the central longitudinal axis in a coiling manner and occupying the groove. The process is for use with a product, to product being of the type having a metal strip encircling a central longitudinal axis in a coiling manner, the strip defining a tubular arrangement, the tubular arrangement having a groove defined by the edges of the strip. The process comprises the steps of: coiling a yarn about the tubular arrangement such that the yarn encircles the central longitudinal axis in a coiling manner and occupies the groove, thereby to produce a marked product.

Abstract: 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.