(19)

(11)

EP 0 455 696 A1

(12)

(43) Date of publication: 13.11.1991 Bulletin 1991/46 (21) Application number: 90902412.0 (22) Date of filing: 24.01.1990

(51) International Patent Classification (IPC):  F04B 43/ 00( . ) F04B 47/ 02( . ) (86) International application number: PCT/SE1990/000053 (87) International publication number: WO 1990/008898 (09.08.1990 Gazette 1990/19)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB IT LI LU NL SE (30) Priority: 24.01.1989 SE 19890000237 (71) Applicant: Humanteknik AB S-117 43 Stockholm (SE)	(72) Inventor: Lundbäck,Stig S-185 00 Vaxholm (SE) (74) Representative: Nyberg, Bengt  CARMINGER, UUSITALO & NYBERG Patentbyra AB P.O. Box 7274 S-103 89 Stockholm S-103 89 Stockholm (SE)