(19)

(11)

EP 0 465 499 A1

(12)

(43) Date of publication: 15.01.1992 Bulletin 1992/03 (21) Application number: 90904888.0 (22) Date of filing: 08.03.1990

(51) International Patent Classification (IPC):  E01C 19/ 20( . ) E01H 10/ 00( . ) (86) International application number: PCT/GB1990/000350 (87) International publication number: WO 1990/011409 (04.10.1990 Gazette 1990/23)

(84) Designated Contracting States: AT BE CH DE DK FR IT LI LU NL SE (30) Priority: 28.03.1989 GB 19890006957 (71) Applicants: WEST YORKSHIRE HIGHWAYS ENGENEERING AND TECHNICAL SERVICES JOINT COMMITTEE Leeds LS2 8JX (GB) CONVEYERS YORKSHIRE LIMITED Leeds LS4 2AU (GB)	(72) Inventors: COTTON, William, Frank Leeds LS8 2QN (GB) MCGEE, Terence Leeds LS8 2JX (GB) (74) Representative: Orr, William McLean, et al  URQUHART-DYKES & LORD 5th Floor, Tower House Merrion Way Leeds West Yorkshire, LS2 8PA Leeds West Yorkshire, LS2 8PA (GB)