EP 2961545 A1 20160106 - METHOD FOR PRODUCING SCREWS AND CONCRETE SCREW
Title (en)
METHOD FOR PRODUCING SCREWS AND CONCRETE SCREW
Title (de)
HERSTELLUNGSVERFAHREN FÜR SCHRAUBEN UND BETONSCHRAUBE
Title (fr)
PROCÉDÉ DE FABRICATION DE VIS ET VIS À BÉTON
Publication
Application
Priority
- DE 102013203148 A 20130226
- EP 2014052690 W 20140212
Abstract (en)
[origin: WO2014131617A1] The invention relates to a method for producing a concrete screw comprising a shaft and a screw thread arranged on the lateral surface of the shaft. Said lateral surface of the shaft comprises, on the end of the shaft, at least one cut-out recess. According to the invention, a piece of rod (11) is provided as a workpiece, at least one threaded coil is formed on the lateral surface of the workpiece in a thread rolling process in which two profiled rolling tools (61, 62) act on the workpiece (11), and at least one recess (16, 16', 16") is formed in the lateral surface of the workpiece on an end area of the workpiece. According to the invention, the recess (16, 16', 16"), when seen in the cross-section of the workpiece, is diametrically opposite an area (96, 96', 96") of the workpiece free of recesses such that initially the recess is formed in the lateral surface of the workpiece and subsequently, the threaded coils are formed on the lateral surface of the workpiece, and that at least one of the rolling tools (61, 62) also acts upon the end area of the workpiece with the recess during the thread rolling process. The invention also relates to a concrete screw having different eccentricity.
IPC 8 full level
B21H 3/02 (2006.01); F16B 25/00 (2006.01)
CPC (source: EP US)
B21H 3/022 (2013.01 - EP US); B21H 3/027 (2013.01 - EP US); B21H 3/06 (2013.01 - US); F16B 25/0026 (2013.01 - EP US); F16B 25/0084 (2013.01 - EP US)
Citation (search report)
See references of WO 2014131617A1
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated extension state (EPC)
BA ME
DOCDB simple family (publication)
DE 102013203148 A1 20140828; CN 105026069 A 20151104; EP 2961545 A1 20160106; TW 201447119 A 20141216; US 2016001348 A1 20160107; WO 2014131617 A1 20140904
DOCDB simple family (application)
DE 102013203148 A 20130226; CN 201480010318 A 20140212; EP 14706507 A 20140212; EP 2014052690 W 20140212; TW 103102202 A 20140122; US 201414770396 A 20140212