Invention Grant
- Patent Title: Screw
- Patent Title (中): 拧
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Application No.: US11941689Application Date: 2007-11-16
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Publication No.: US07862279B2Publication Date: 2011-01-04
- Inventor: Günter Stiebitz , Uwe Wolfarth
- Applicant: Günter Stiebitz , Uwe Wolfarth
- Applicant Address: DE Kuenzelsau CH Chur
- Assignee: SWG Schraubenwerk Gaisbach GmbH,Wuerth International AG
- Current Assignee: SWG Schraubenwerk Gaisbach GmbH,Wuerth International AG
- Current Assignee Address: DE Kuenzelsau CH Chur
- Agency: Duane Morris LLP
- Priority: DE102006057259 20061122
- Main IPC: F16B25/10
- IPC: F16B25/10 ; F16B35/04

Abstract:
A screw, in particular a self-tapping screw, has a screw thread which covers up to the front end of the screw formed as a drilling tip or cutting tip. In the front area, starting with a distance from the front end of the screw, there is an opposite thread showing the same pitch as the screw thread, however, its thread height is lower than the thread height of the screw thread. This second, opposite single-thread, double-thread or triple-thread/multi-thread forms a cutting edge with its thread edge which is used to cut fibers in order to reduce wedge effect during screwing in the screw. The screw is particularly suitable for wood or wood-like materials in the edge areas of structural elements.
Public/Granted literature
- US20080118330A1 SCREW Public/Granted day:2008-05-22
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