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:
Oct. 01, 1985
Filed:
Sep. 19, 1983
Applicant:
Inventor:
Peter R Rogers, Chepstow, GB;
Assignee:
TRW Cam Gears Limited, Avon, GB;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B21D / ;
U.S. Cl.
CPC ...
72356 ; 72370 ;
Abstract
This invention relates to methods of making valve sleeves. The valve sleeve 35 is manufactured from a tube 10 which is initially placed on a mandrel 20, which is formed with axially-extending projections 23 spaced about it circumferentially. The tube is then swaged on to the mandrel to form grooves 28, which have the shape and the dimensions of 23. The mandrel 20 is then replaced by a cylindrical mandrel 30 and the open ends of grooves 28 are then closed by a further swaging operation. This method enables valve sleeves, having stopped axially-extending grooves in their inner surface with accurately located lips, to be formed from a single piece of metal.