(19)

(11)

EP 0 587 583 A1

(12)

(43) Date of publication: 23.03.1994 Bulletin 1994/12 (21) Application number: 92908934.0 (22) Date of filing: 01.05.1992

(51) International Patent Classification (IPC):  E04F 15/ 024( . ) (86) International application number: PCT/GB1992/000801 (87) International publication number: WO 1992/019828 (12.11.1992 Gazette 1992/28)

(84) Designated Contracting States: AT BE CH DE DK ES FR GR IT LI LU MC NL SE (30) Priority: 07.05.1991 GB 19910009837 (71) Applicant: DURABELLA LIMITED South Ockendon, Essex RM15 5TR (GB)	(72) Inventors: TIPSON, Frank Billericay Essex CM11 2XN (GB) SPOONER, John Chelmsford Essex CM3 5GL (GB) FRANCIS, Paul Westcliff On Sea Essex SSO 9DY (GB) (74) Representative: Evans, David Charles, et al  F.J. CLEVELAND & COMPANY 40-43, Chancery Lane London, WC2A 1JQ London, WC2A 1JQ (GB)