(19)

(11)

EP 0 506 707 A1

(12)

(43) Date of publication: 07.10.1992 Bulletin 1992/41 (21) Application number: 91900290.0 (22) Date of filing: 18.12.1990

(51) International Patent Classification (IPC):  A63H 33/ 06( . ) A63H 33/ 08( . ) (86) International application number: PCT/GB1990/001971 (87) International publication number: WO 1991/008811 (27.06.1991 Gazette 1991/14)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IT LI LU NL SE (30) Priority: 18.12.1989 GB 19890028504 (71) Applicant: E.J. ARNOLD & SON LIMITED West Bridgford, Nottingham NG2 6HD (GB)	(72) Inventor: STONE, Robert, John 37 Gibraltar Lane Cambridgeshire CB4 5RR (GB) (74) Representative: Howick, Nicholas Keith  CARPMAELS & RANSFORD 43 Bloomsbury Square London WC1A 2RA London WC1A 2RA (GB)