(19)

(11)

EP 0 487 536 A1

(12)

(43) Date of publication: 03.06.1992 Bulletin 1992/23 (21) Application number: 90910527.0 (22) Date of filing: 10.07.1990

(51) International Patent Classification (IPC):  F16L 3/ 26( . ) H02G 3/ 04( . ) (86) International application number: PCT/NO1990/000113 (87) International publication number: WO 1991/000973 (24.01.1991 Gazette 1991/03)

(84) Designated Contracting States: AT BE DE DK FR GB IT LU NL SE (30) Priority: 11.07.1989 NO 19890002874 (71) Applicant: KOKKERSVOLD, Tor N-3947 Langangen (NO)	(72) Inventor: KOKKERSVOLD, Tor N-3947 Langangen (NO) (74) Representative: Wilhelms, Rolf E., Dr.  WILHELMS, KILIAN & PARTNER Patentanwälte Eduard-Schmid-Strasse 2 D-81541 München D-81541 München (DE)