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:
Jan. 31, 1984
Filed:
Jan. 22, 1982
Ivan O Ramnesten, Eskilstuna, SE;
Forenade Fabriksverken, Eskilstuna, SE;
Abstract
A mandrel for the production of internally threaded tubes or cylinders by the cold forging of a forging blank (3) around an externally threaded mandrel (2). The mandrel is formed with a conicity of 0.2-1.0% or preferably 0.4-0.7% and the flanks of the mandrel's threads can be ground so that the thread width is least at the mandrel's narrow end. The reduction of flank width can be 0.1-0.4% of preferably 0.2-0.3% for a length unit of the mandrel with the above named conicity. Preferably even the inner diameter of the mandrel's thread is made 0-0.5% less than the required inside diameter in the tube's or cylinder's thread.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile