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:
Jul. 03, 1990
Filed:
Aug. 06, 1986
Applicant:
Inventors:
Douglas C Duffy, West Ryde, AU;
Richard D Temby, Woodville West, AU;
Assignee:
Rheem Australia Limited, Sydney, AU;
Primary Examiner:
Int. Cl.
CPC ...
B21D / ;
U.S. Cl.
CPC ...
72356 ; 72367 ; 220 / ; 220 74 ; 220319 ; 413-6 ; 413 31 ;
Abstract
The formation of an outwardly extending curl as the upper rim of a pail or drum having a cylindrical wall by curling the peripheral edge through greater than 360.degree. relative to the cylindrical wall forms a strong curl able to support, with the aid of a gasket, a leak proof seal during dangerous goods testing. When used with a lug-cover lid, the lugs may be clenched beneath the curl through a re-entrant portion enhancing the security of the seal. Methods of forming the curl in a two-storage operation by forming primary and then secondary curl components, and an improved lug configuration are also described.