(19)

(11)

EP 0 494 893 A1

(12)

(43) Date of publication: 22.07.1992 Bulletin 1992/30 (21) Application number: 90914185.0 (22) Date of filing: 26.09.1990

(51) International Patent Classification (IPC):  E04F 11/ 02( . ) E04F 11/ 025( . ) (86) International application number: PCT/FI1990/000227 (87) International publication number: WO 1991/005122 (18.04.1991 Gazette 1991/09)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB IT LI LU NL SE (30) Priority: 04.10.1989 FI 19890004706 (71) Applicant: RIIHIMÄKI, Juha SF-31640 Humppila K.P. 1 (FI)	(72) Inventor: RIIHIMÄKI, Juha SF-31640 Humppila K.P. 1 (FI) (74) Representative: Nielsen, Henrik Sten, et al  c/o TH. OSTENFELD PATENTBUREAU A/S, Bredgade 41, P.O. Box 1183 DK-1011 Copenhagen K DK-1011 Copenhagen K (DK)