(19)

(11)

EP 0 456 714 A1

(12)

(43) Date of publication: 21.11.1991 Bulletin 1991/47 (21) Application number: 90902855.0 (22) Date of filing: 22.01.1990

(51) International Patent Classification (IPC):  E04B( . ) E04B 1/ 76( . ) B25B 31/ 00( . ) E04F 13/ 08( . ) (86) International application number: PCT/SE1990/000047 (87) International publication number: WO 1990/008863 (09.08.1990 Gazette 1990/19)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB IT LI LU NL SE (30) Priority: 01.02.1989 SE 19890000349 (71) Applicant: ERNSTRÖM BYGG AB S-710 23 Glanshammar (SE)	(72) Inventor: RUDSTRÖM, Arne S-541 94 Skövde (SE) (74) Representative: Rackette, Karl, Dipl.-Phys. Dr.-Ing  Postfach 1310 D-79013 Freiburg D-79013 Freiburg (DE)