B - Operations – Transporting – 21 – D
Patent
B - Operations, Transporting
21
D
113/47
B21D 51/00 (2006.01) B21C 37/12 (2006.01) B21D 53/00 (2006.01)
Patent
CA 1074627
METHOD AND APPARATUS FOR THE MANUFACTURE OF REINFORCED SMOOTH FLOW PIPE ABSTRACT OF THE DISCLOSURE A method and apparatus for the continuous manufacture of re- inforced, spirally wound pipe having a generally smooth inner wall produced from an elongated flat sheet of ductile material, such as galvanized steel, and one or more narrow strips of ductile material. The sheet and strips are situated in rolls located at the entry end of a rolling apparatus which is constructed to form one longitudinal generally trapezoidal reinforced impression in the sheet correspond- ing to each of the narrow strips. In the process of forming the impressions, rolling stands in the rolling apparatus first fashion a longitudinal, generally rectangular channel in the sheet corres- ponding to each strip as the sheet progresses through the rolling apparatus. At the same time, the strips are shaped into reinforce- ment elements having an extended, continuous portion and splayed legs extending outwardly from the edges of the continuous portion. After formation, each strip is inserted into its respective channel and the channel closed about the strip to form the trapezoidal im- pression. The reinforced sheet is then curled into adjacent, helical convolutions which are joined with an appropriate seam.
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