(19)

(11)

EP 0 248 809 A1

(12)

(43) Date of publication: 16.12.1987 Bulletin 1987/51 (21) Application number: 86901952.0 (22) Date of filing: 20.03.1986

(51) International Patent Classification (IPC):  E04D 13/ 064( . ) E04D 13/ 076( . ) (86) International application number: PCT/GB1986/000158 (87) International publication number: WO 1986/005539 (25.09.1986 Gazette 1986/21)

(84) Designated Contracting States: DE GB (30) Priority: 21.03.1985 GB 19850007369 (71) Applicant: NIPPER, John Worcestershire, B98 8PH (GB)	(72) Inventor: NIPPER, John Worcestershire, B98 8PH (GB) (74) Representative: Adkins, Michael  Withers & Rogers 4 Dyer's Buildings Holborn London EC1N 2JT London EC1N 2JT (GB)