(19)

(11)

EP 0 521 054 A1

(12)

(43) Date of publication: 07.01.1993 Bulletin 1993/01 (21) Application number: 91906469.0 (22) Date of filing: 18.03.1991

(51) International Patent Classification (IPC):  B08B 3/ 02( . ) F04B 53/ 12( . ) (86) International application number: PCT/DK1991/000080 (87) International publication number: WO 1991/014517 (03.10.1991 Gazette 1991/23)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IT LI LU NL SE (30) Priority: 20.03.1990 DK 19900000724 (71) Applicant: K.F. INDUSTRI A/S DK-9500 Hobro (DK)	(72) Inventor: FRANDSEN, Karl Johan Klitgaard DK-9500 Hobro (DK) (74) Representative: Gregersen, Niels Henrik Aarhus Patentkontor  Skanderborgvej 40 DK-8000 Aarhus C DK-8000 Aarhus C (DK)