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. 04, 1986
Filed:
Mar. 19, 1985
Ivano G Cudini, Woodstock, CA;
Standard Tube Canada Inc., Woodstock, CA;
Abstract
A box-like frame member is formed by deforming the sides of a tubular blank inwardly to provide it with concavely recessed portions in areas corresponding to generally opposing flat surfaces of the product. The deformed blank is expanded, under internally applied fluid pressure, within a sectional die which has its die cavity preferably no more than about 5% larger than the circumference of the blank, to avoid weakening, cracking or yielding of the blank through excessive circumferential expansion. The inward deformation of the side walls permits the blank to be confined within the sectional die without sections of the die pinching the blank on closing of the die, allows for substantially uniform expansion of the blank toward the box-like section and permits the intermediate, deformed blank and the final product to be formed with a smoothly continuous cross-sectional profile, avoiding stress concentrations in the forming procedure and in the final product which can impair the mechanical strength of the product. The tubular blank may be bent into a complex configuration, preferably before inward deformation of its side walls.