EP 1285481 A1 20030226 - METHOD AND APPARATUS FOR MAKING SPARK PLUG
Title (en)
METHOD AND APPARATUS FOR MAKING SPARK PLUG
Title (de)
VERFAHREN UND VORRICHTUNG ZUR HERSTELLUNG EINER ZÜNDKERZE
Title (fr)
PROCEDE ET DISPOSITIF PERMETTANT DE PRODUIRE UNE BOUGIE D'ALLUMAGE
Publication
Application
Priority
JP 0003479 W 20000530
Abstract (en)
[origin: WO0193389A1] This invention relates to a method and apparatus for making a spark plug, in particular, for making a high-performance spark plug having a center electrode having a firing end made of Pt, Ir, Rh, Pd, Re, Os, Ru or alloy thereof, with its firing end diameter of about 0.3-1.0 mm. One of the embodiments provides a method comprising the steps of: extending a metal strip from an end of the metal shell; positioning a spacer above a firing end of the center electrode; preliminarily bending the metal strip toward the spacer so as to form an arc portion in the metal strip; and then precisely forming a gap-distance between the metal strip and the firing end of the center electrode by applying a force to the metal strip. The method may further include a step of measuring the position of the firing end of the center electrode so as to determine a position for the spacer and/or a step of retrieving the spacer after bending the metal strip so that the gap-distance between the metal strip and the center electrode is adjusted to a required value by referring to a position of the preliminary bent metal strip and the position of the firing end of the center electrode. The invention also provides an apparatus for performing this method.
IPC 1-7
IPC 8 full level
H01T 21/06 (2006.01)
CPC (source: EP KR)
H01T 13/20 (2013.01 - KR); H01T 21/06 (2013.01 - EP)
Citation (search report)
See references of WO 0193389A1
Designated contracting state (EPC)
DE FR GB IT
DOCDB simple family (publication)
WO 0193389 A1 20011206; AU 4783400 A 20011211; CN 1309130 C 20070404; CN 1365531 A 20020821; DE 60021431 D1 20050825; DE 60021431 T2 20060524; EP 1285481 A1 20030226; EP 1285481 B1 20050720; KR 100741934 B1 20070724; KR 20020042616 A 20020605
DOCDB simple family (application)
JP 0003479 W 20000530; AU 4783400 A 20000530; CN 00810982 A 20000530; DE 60021431 T 20000530; EP 00929922 A 20000530; KR 20027000431 A 20020111