(19)

(11)

EP 0 561 924 A1

(12)

(43) Date of publication: 29.09.1993 Bulletin 1993/39 (21) Application number: 92900946.0 (22) Date of filing: 16.12.1991

(51) International Patent Classification (IPC):  F16D 1/ 091( . ) F16D 1/ 096( . ) (86) International application number: PCT/GB1991/002233 (87) International publication number: WO 1992/010691 (25.06.1992 Gazette 1992/14)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB IT LI LU NL SE (30) Priority: 15.12.1990 GB 19900027215 (71) Applicant: J.H. FENNER & CO. LIMITED Wellton Brough, North Humberside HU11 5AP (GB)	(72) Inventors: MAKIN, David Leonard Hull, North Humberside HU1 5AP (GB) SEABROOK, Colin Driffield, North Humberside Y025 9HS (GB) (74) Representative: W.P. THOMPSON & CO.  Kings Building, South Church Side Hull, North Humberside HU1 1RR Hull, North Humberside HU1 1RR (GB)