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(11)

EP 0 421 993 A1

(12)

(43) Date of publication: 17.04.1991 Bulletin 1991/16 (21) Application number: 88907867.0 (22) Date of filing: 22.08.1988

(51) International Patent Classification (IPC):  F16K 1/ 30( . ) F17C 13/ 04( . ) F16K 17/ 196( . ) (86) International application number: PCT/SE1988/000427 (87) International publication number: WO 1989/002047 (09.03.1989 Gazette 1989/06)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 31.08.1987 SE 19870003353 (71) Applicants: SVAHN, Ove S-811 92 Sandviken (SE) HEDLUND, Per S-811 60 Sandviken (SE)	(72) Inventor: HEDLUND, Per S-811 60 Sandviken (SE) (74) Representative: Bjerkén, Jarl Hakan  Bjerkéns Patentbyra KB P.O.Box 1274 S-801 37 Gävle S-801 37 Gävle (SE)