(19)

(11)

EP 0 591 481 A1

(12)

(43) Date of publication: 13.04.1994 Bulletin 1994/15 (21) Application number: 93905493.0 (22) Date of filing: 03.03.1993

(51) International Patent Classification (IPC):  E06B 3/ 267( . ) (86) International application number: PCT/GB1993/000435 (87) International publication number: WO 1993/018267 (16.09.1993 Gazette 1993/22)

(84) Designated Contracting States: BE DE ES FR GB IE IT NL (30) Priority: 13.03.1992 GB 19920005523 (71) Applicant: BKL EXTRUSIONS LIMITED Kings Norton, Birmingham B30 3HF (GB)	(72) Inventor: CHINN, Keith Birmingham B26 2HW (GB) (74) Representative: Thorpe, Brian, et al  Forrester & Boehmert Franz-Joseph-Strasse 38 D-80801 München D-80801 München (DE)