The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 13, 1977
Filed:
Jun. 23, 1976
Applicant:
Inventors:
Assignee:
The Steel Company of Canada, Limited, Hamilton, CA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B21B / ;
U.S. Cl.
CPC ...
72370 ; 72393 ;
Abstract
This invention provides a method and apparatus for expanding spiralweld pipe. The expander head is cantilevered at a fixed location and the spiralweld pipe is advanced in stages around the expander head, moving in the direction of the pipe axis. At each stage, the pipe is stopped, and the expander head is expanded to cause expansion in the pipe. The expander head has on its surface a helically arranged recess matching the main weld of the pipe. As the pipe is moved between adjacent expansion locations, it undergoes axial and rotational motion so that the main weld tracks in registry with the recess.