(19)

(11)

EP 1 117 872 A1

(12)

(43) Date of publication: 25.07.2001 Bulletin 2001/30 (21) Application number: 99932988.1 (22) Date of filing: 14.07.1999

(51) International Patent Classification (IPC)7: E01F 1/00, B61B 1/02 (86) International application number: PCT/GB9902/120 (87) International publication number: WO 0004/236 (27.01.2000 Gazette 2000/04)

(84) Designated Contracting States: AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE Designated Extension States: AL LT LV MK RO SI (30) Priority: 15.07.1998 GB 9815303 23.09.1998 GB 9820614 (71) Applicant: Rea, Derek William York YO41 1NL (GB)	(72) Inventor: Rea, Derek William York YO41 1NL (GB) (74) Representative: Fry, Alan Valentine et al FRY HEATH & SPENCEThe Old College53 High Street HorleySurrey RH6 7BN HorleySurrey RH6 7BN (GB)