(19)

(11)

EP 0 374 213 A1

(12)

(43) Date of publication: 27.06.1990 Bulletin 1990/26 (21) Application number: 89905139.0 (22) Date of filing: 20.04.1989

(51) International Patent Classification (IPC):  F16C 33/ 78( . ) F16J 15/ 32( . ) (86) International application number: PCT/GB1989/000418 (87) International publication number: WO 1989/010505 (02.11.1989 Gazette 1989/26)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI NL (30) Priority: 20.04.1988 GB 19880009257 (71) Applicant: WOODVILLE POLYMER ENGINEERING LIMITED Ross-on-Wye Herefordshire HR9 5NF (GB)	(72) Inventor: GREGORY, Christopher Gloucester GL4 7ED (GB) (74) Representative: Chapple, Colin Richard  Dowty Group Services Ltd. Patents Dept. Arle Court Cheltenham, Glos. GL51 0TP Cheltenham, Glos. GL51 0TP (GB)