(19)

(11)

EP 0 404 814 A1

(12)

(43) Date of publication: 02.01.1991 Bulletin 1991/01 (21) Application number: 89903829.0 (22) Date of filing: 15.03.1989

(51) International Patent Classification (IPC):  E04D 3/ 363( . ) (86) International application number: PCT/SE1989/000132 (87) International publication number: WO 1989/008756 (21.09.1989 Gazette 1989/23)

(84) Designated Contracting States: DE GB (30) Priority: 16.03.1988 SE 19880000948 (71) Applicant: GRÄNGES ALUMINIUM AKTIEBOLAG S-18215 Danderyd (SE)	(72) Inventor: VINBERG, Hans S-133 00 Saltsjöbaden (SE) (74) Representative: Frankland, Nigel Howard, et al  FORRESTER & BOEHMERT Franz-Joseph-Strasse 38 D-80801 München D-80801 München (DE)