(19)

(11)

EP 0 497 861 A1

(12)

(43) Date of publication: 12.08.1992 Bulletin 1992/33 (21) Application number: 90916394.0 (22) Date of filing: 26.10.1990

(51) International Patent Classification (IPC):  E04G( . ) E04G 3/ 26( . ) E04G 3/ 22( . ) (86) International application number: PCT/SE1990/000693 (87) International publication number: WO 1991/006729 (16.05.1991 Gazette 1991/11)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB IT LI NL SE (30) Priority: 27.10.1989 SE 19890003607 11.09.1990 SE 19900002890 (71) Applicant: AB PA-SO PRODUKTER S-774 00 Avesta (SE)	(72) Inventors: SÖDERGREN, Reine S-775 00 Krylbo (SE) BJÖRK, Sören S-775 00 Krylbo (SE) (74) Representative: Sundström, Per Olof  Stenhagen Patentbyra AB P.O. Box 4630 S-116 91 Stockholm S-116 91 Stockholm (SE)