06-06-2013 дата публикации
Номер: US20130142590A1
Принадлежит:
A fastening element, which may be in the form of a blind rivet or screw, is intended to be fired into an unperforated workpiece. In its front region that is intended to be fired into the workpiece, it includes a punching section which is formed in a cylindrical manner, and has a front end face which extends obliquely to the longitudinal axis. The punching section may be smaller in diameter than the body of the fastening element or else have the same diameter. The section between the end face and the outer side of the punching section forms a punching edge. On account of the oblique profile of the end face, said punching edge is arranged such that, when the fastening element is fired in, the punching edge first of all strikes the metal sheet at one or else at two points, and the opening in the metal sheet is enlarged by shearing off the metal sheet at a point migrating around the circumference. 1. A fastening element for driving in , having{'b': 1', '7, 'a fastening element body (, ) which'}{'b': 2', '8', '3, 'has a head (, ) having an abutment shoulder () on its underside, and'}{'b': '9', 'a punching section () which forms the front end of the fastening element and'}{'b': 5', '15', '25', '35', '41, 'has an end face (, , , ) bounded by a circumferential edge (), which end face'}is not located in a transverse plane that extends perpendicularly to the longitudinal axis, wherein{'b': '41', 'the circumferential edge () is formed in at least one section as a punching edge, and'}for at least one of said cutting edges starting from a tip of the cutting edge, cutting is undertaken only in one direction.29. The fastening element as claimed in claim 1 , wherein the punching section () has a cylindrical claim 1 , in particular circular-cylindrical outer contour.34151525359. The fastening element as claimed in claim 1 , wherein the circumferential edge () is formed by a section line between the end face ( claim 1 , claim 1 , claim 1 , ) and a cylindrical outer contour of the ...
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