(19)

(11)

EP 0 592 452 A1

(12)

(43) Date of publication: 20.04.1994 Bulletin 1994/16 (21) Application number: 92907462.0 (22) Date of filing: 06.04.1992

(51) International Patent Classification (IPC):  E01C 23/ 18( . ) E01F 9/ 06( . ) (86) International application number: PCT/GB1992/000610 (87) International publication number: WO 1992/017648 (15.10.1992 Gazette 1992/26)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IT LI LU MC NL SE (30) Priority: 05.04.1991 GB 19910007185 05.04.1991 GB 19910007186 31.08.1991 GB 19910018719 (71) Applicant: Pacey, Barry David Blackwood, Gwent NP9 1HJ (GB)	(72) Inventor: Pacey, Barry David Blackwood, Gwent NP9 1HJ (GB) (74) Representative: Denmark, James  Bailey, Walsh & Co. 5 York Place Leeds LS1 2SD Yorkshire Leeds LS1 2SD Yorkshire (GB)