(19)

(11)

EP 0 828 957 A1

(12)

(43) Date of publication: 18.03.1998 Bulletin 1998/12 (21) Application number: 96914344.0 (22) Date of filing: 22.05.1996

(51) International Patent Classification (IPC):  B21D 19/ 08( . ) F16J 15/ 08( . ) (86) International application number: PCT/GB1996/001233 (87) International publication number: WO 1996/038684 (05.12.1996 Gazette 1997/01)

(84) Designated Contracting States: DE FR GB IT (30) Priority: 02.06.1995 GB 19950011177 (71) Applicant: Coopers Payen Ltd. Slough, Berkshire SL1 4QP (GB)	(72) Inventors: PERCIVAL, Paul, Reuben Maidenhead Berkshire SL6 3EZ (GB) WRIGHT, Vincent, Clive Holyport Maidenhead Berkshire SL6 4HQ (GB) CUNNINGTON, Keith Ruislip Middlesex HA4 7SP (GB) (74) Representative: Drury, Peter Lawrence  T&N plc Bowden House Ashburton Road West Trafford Park Manchester M17 1RA Trafford Park Manchester M17 1RA (GB)