Title: Multiple roll recorrugator

Abstract: The invention concerns an apparatus for forming annular circumferential corrugations in the end of a helically corrugated seamed pipe. Two corrugating rolls, a backup roll and a thrust roll, engage the wall of the pipe to form the annular corrugations. The backup roll normally engages the inner wall of the pipe, and the thrust roll, the outer wall. The thrust roll is formed from a plurality of independent and transversely movable roll sections urged with a predetermined force into engagement with the pipe by a support composed of a group of rolls engaging the periphery of a corresponding roll section and mounted within a pivotable lever frame. The predetermined force is provided by a pressure-controlled hydraulic cylinder acting through each of the lever frames.

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Inventors: Nyssen, Adrianus Marinus (Chilliwack, CA, US)
Rauch, Gerhard Josef (Surrey, CA, US)

Application Number: 716166
Filing Date: 1976-08-20
Publication_date: 1977-06-21
Assignee: Ironside's Machine & Welding Ltd. (Chilliwack, CA)
Primary Class(es): 72/105 72/107, 72/179, 72/370.19, 72/466.7
Other Classes:
US Patent Ref:

837756	Dec, 1906	Thomas	29/125.
2170946	Aug, 1939	Grief	72/106.
2292851	Aug, 1942	Tykal	29/125.
2326076	Aug, 1943	Solem	29/125.
3464253	Sep, 1969	Beyer et al.	72/110.
3485076	Dec, 1969	Colburn	72/465.

Other Refs: 1,184,726

Jan, 1965	DT

Primary Examiner: Larson, Lowell A.
Assistant Examiner:
Attorney: Lee & Smith