Patent · US Active

Chiplessly thread-forming screw

US8342788B2 · kind B2 · utility

3Cited by

9References

8Claims

0Family size

Assignee

Hilti Aktiengesellschaft · LI

Inventors

Sven Matthiesen · Gettorf, DE
Frank Rieger · Pittsburgh, US
Peter Hertlein · Gams, CH
Michael Baumgartner · Rekingen, CH
Peter Mugg · Bludenz, AT
Matthias Schaefer · Neustadt bei Coburg, DE

Key dates

Filing date	May 16, 2007
Grant date	Jan 1, 2013
Priority date	—
Expiry date	Aug 17, 2030

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF16B25/0057
WIPO fieldMechanical elements
WIPO sectorMechanical engineering

Abstract

A chiplessly thread-forming screw has a stem (11) at one end of which a tip (13) is provided and at another end of which a head (14) is provided, and which has a pointed conical section (21) extending from the tip (13) in a direction of the head (14), a cylindrical section (25) arranged between the first pointed section (21) and the head (14), a first cambered section (22) adjoining the pointed conical section (21) in the direction of the head, and a second cambered section (24) arranged between the first cambered section (22) and the cylindrical section (25) and an outer surface (16) of which has a second curvature radius (R2) unequal to the first curvature radius (R1) of the outer surface (12) of the first cambered section (21).

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.