EP 0187623 B1 19890510 - APPARATUS FOR COLD-PRESSING A TAPERED THREAD
Title (en)
APPARATUS FOR COLD-PRESSING A TAPERED THREAD
Publication
Application
Priority
CH 10385 A 19850110
Abstract (en)
[origin: US4689984A] A male conical thread of an elongated steel structure, e.g. a steel rod or wire of the type employed as reinforcement in pre-stressed concrete, for use in engagement with a matching female conical thread provided in a fixing sleeve or other nut means is formed by first shaping an end portion of the wire or rod, e.g. by grinding or hammering, into a cone that tapers down towards the end of the rod or wire and has a generally truncated smooth outer surface; then, the cone's surface is deformed by cold-pressing such that the thread is formed. Further, a press-die appartus is disclosed for use in such cold-pressing, e.g. at a construction site where steel reinforcements are mounted.
IPC 1-7
IPC 8 full level
E04C 5/12 (2006.01); B21H 3/02 (2006.01); B21J 13/02 (2006.01); B21K 1/56 (2006.01)
CPC (source: EP US)
B21J 13/025 (2013.01 - EP US); B21K 1/56 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE CH DE FR GB IT LI LU NL SE
DOCDB simple family (publication)
EP 0187623 A1 19860716; EP 0187623 B1 19890510; AT E42920 T1 19890515; AU 5215886 A 19860717; AU 579218 B2 19881117; CH 665152 A5 19880429; DE 3570055 D1 19890615; JP H0724912 B2 19950322; JP S61206538 A 19860912; US 4689984 A 19870901; ZA 86102 B 19860924
DOCDB simple family (application)
EP 85810618 A 19851230; AT 85810618 T 19851230; AU 5215886 A 19860109; CH 10385 A 19850110; DE 3570055 T 19851230; JP 284286 A 19860109; US 81227585 A 19851223; ZA 86102 A 19860107