(19)

(11)

EP 0 859 924 A1

(12)

(43) Date of publication: 26.08.1998 Bulletin 1998/35 (21) Application number: 96938256.0 (22) Date of filing: 22.11.1996

(51) International Patent Classification (IPC):  F15B 13/ 04( . ) G05D 16/ 10( . ) (86) International application number: PCT/FI1996/000631 (87) International publication number: WO 1997/020157 (05.06.1997 Gazette 1997/24)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IE IT LI NL PT SE (30) Priority: 24.11.1995 FI 19950005684 (71) Applicant: Rita, Leo 50190 Mikkeli (FI)	(72) Inventor: RITA, Pentti FIN-50190 Mikkeli (FI) (74) Representative: Tanhua, Pekka Vilhelm, et al  Berggren Oy Ab, P.O. Box 16 00101 Helsinki 00101 Helsinki (FI)