(19)

(11)

EP 0 329 647 A1

(12)

(43) Date of publication: 30.08.1989 Bulletin 1989/35 (21) Application number: 86906831.0 (22) Date of filing: 31.10.1986

(51) International Patent Classification (IPC):  F16L 45/ 00( . ) (86) International application number: PCT/FI1986/000126 (87) International publication number: WO 1988/003244 (05.05.1988 Gazette 1988/10)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (71) Applicant: RUUSUVIRTA, Onni Kalevi SF-41120 Puuppola (FI)	(72) Inventor: RUUSUVIRTA, Onni Kalevi SF-41120 Puuppola (FI) (74) Representative: Lauw, Rudolf C. W.,Dipl.-Ing., Dipl.-Wirtschaftsing.  Karwinskistrasse 1 D-81247 München D-81247 München (DE)