(19)

(11)

EP 0 542 940 A1

(12)

(43) Date of publication: 26.05.1993 Bulletin 1993/21 (21) Application number: 92908165.0 (22) Date of filing: 09.04.1992

(51) International Patent Classification (IPC):  E04B 1/ 32( . ) E04H 9/ 04( . ) E04H 6/ 04( . ) E04H 15/ 36( . ) (86) International application number: PCT/GB1992/000635 (87) International publication number: WO 1992/018730 (29.10.1992 Gazette 1992/27)

(84) Designated Contracting States: DE FR (30) Priority: 10.04.1991 GB 19910007570 (71) Applicant: DOWTY HOYBOND LIMITED Swadlincote, Derbyshire DE11 9DX (GB)	(72) Inventors: JACKSON, David Hayes Tadworth, Surrey KD20 5TG (GB) JONES, Peter Michael Torquay, Devon TQ1 2DZ (GB) (74) Representative: Hogg, Jeffery Keith  Withers & Rogers 4 Dyer's Buildings Holborn London EC1N 2JT London EC1N 2JT (GB)