Global Patent Index - EP 0404674 A1

EP 0404674 A1 19901227 - Process and device for improving the fatigue resistance of helicoidal springs under compression and springs obtained by this process.

Title (en)

Process and device for improving the fatigue resistance of helicoidal springs under compression and springs obtained by this process.

Title (de)

Verfahren und Vorrichtung zur Verbesserung der Dauerfestigkeit einer zusammengedrückten Schraubenfeder und durch dieses Verfahren hergestellte Feder.

Title (fr)

Procédé et dispositif d'amélioration de la résistance à la fatigue des ressorts hélicoidaux de compression et ressorts obtenus par ce procédé.

Publication

EP 0404674 A1 19901227 (FR)

Application

EP 90401744 A 19900620

Priority

FR 8908222 A 19890620

Abstract (en)

The invention relates to a device for improving the fatigue resistance of a helical compression spring (1) by the shot-blasting of the inner surfaces of said spring, comprising a shot distributor (2) and a moveable shot-projecting member (3) arranged coaxially within said spring and means for the compression of said spring, characterised in that said moveable shot-projecting member (3) comprises a cylindrical rotor (5), the axis of which is substantially vertical during the shot-blasting and which is equipped on its lateral wall with peripheral blades (6, 7) designed to project the shot coming from the distributor (2) against the inner surfaces of the spring as a function of the rotational speed. <IMAGE>

IPC 1-7

B24C 1/10; B24C 3/32; C21D 7/06

IPC 8 full level

B24C 1/10 (2006.01); B24C 3/32 (2006.01); C21D 7/06 (2006.01)

CPC (source: EP)

B24C 1/10 (2013.01); B24C 3/32 (2013.01); C21D 7/06 (2013.01)

Citation (search report)

  • [Y] DE 3711826 A1 19881027 - MEUWSEN & BROCKHAUSEN [DE]
  • [A] DE 3800679 A1 19890119 - TEVES GMBH ALFRED [DE]
  • [A] DE 2616894 A1 19761028 - MAEDA RIICHI
  • [A] US 2249677 A 19410715 - WALLACE WILLIAM H
  • [YD] PATENT ABSTRACTS OF JAPAN vol. 5, no. 187 (M-98)(859) 26 novembre 1981, & JP-A-56 107880 (KOUSHIYUUHA NETSUREN K.K.) 27 août 1981,
  • [A] PATENT ABSTRACTS OF JAPAN vol. 8, no. 35 (M-276)(1472) 15 février 1984, & JP-A-58 192754 (KATOU HATSUJIYOU K.K.) 10 novembre 1983,
  • [A] WIRE INDUSTRY. vol. 55, no. 654, juin 1988, OXTED GB Sommer: "Shot blast descaling and shot peening"
  • [A] PATENT ABSTRACTS OF JAPAN vol. 13, no. 274 (M-841)(3622) 23 juin 1989, & JP-A-1 71666 (TAIYO CHUKI K.K.) 03 mars 1989,

Designated contracting state (EPC)

AT BE CH DE DK ES FR GB GR IT LI LU NL SE

DOCDB simple family (publication)

EP 0404674 A1 19901227; FR 2648380 A1 19901221; FR 2648380 B1 19941007

DOCDB simple family (application)

EP 90401744 A 19900620; FR 8908222 A 19890620