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:
Feb. 08, 1977
Filed:
Aug. 07, 1975
Applicant:
Inventor:
James Hilbert Anderson, York, PA (US);
Assignee:
Other;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B21D / ;
U.S. Cl.
CPC ...
72 54 ; 72 58 ;
Abstract
An apparatus for expanding a tube or pipe by axially compressing an annular resilient element to cause said element to radially expand into engagement with the inner surface of the tube or pipe. The compressing of the resilient element and its radial expansion is caused by a main piston and cylinder structure which is subjected to fluid under pressure. A secondary or impact piston is provided in the main piston for applying higher stresses to the tube or pipe through the resilient element. The resilient element is interposed between a plurality of spaced annular ring members which constitute guide means therefor.