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:
Dec. 16, 2008
Filed:
Jun. 17, 2005
Rainer Scharp, Vaihingen, DE;
Peter Kemnitz, Leutenbach, DE;
Rainer Scharp, Vaihingen, DE;
Peter Kemnitz, Leutenbach, DE;
Mahle GmbH, Stuttgart, DE;
Abstract
The invention relates to an assembled piston () for an internal combustion engine, said piston consisting of an upper part () and a lower part () that are interconnected by means of an internal hexagon screw () consisting of an upper half() and a lower half (). The upper half () of the internal hexagon screw () comprises an external thread () which is parallel to the external thread () of the lower screw half () and has a larger lead angle than the same (). The lead angle resulting from the difference between the lead angles of the two external threads () is very small and contributes to a high strength of the screw connection.