(19)

(11)

EP 0 521 942 A1

(12)

(43) Date of publication: 13.01.1993 Bulletin 1993/02 (21) Application number: 91906436.0 (22) Date of filing: 25.03.1991

(51) International Patent Classification (IPC):  B61B 11/ 00( . ) B62B 17/ 00( . ) (86) International application number: PCT/NO1991/000047 (87) International publication number: WO 1991/014607 (03.10.1991 Gazette 1991/23)

(84) Designated Contracting States: AT CH DE FR IT LI SE (30) Priority: 26.03.1990 NO 19900001370 21.12.1990 NO 19900005533 21.12.1990 NO 19900005534 (71) Applicants: PEDERSEN, Ivar-Arnljot N-7651 Verdal (NO) LAENN, Per Terje N-7700 Steinkjer (NO)	(72) Inventors: PEDERSEN, Ivar-Arnljot N-7651 Verdal (NO) LAENN, Per Terje N-7700 Steinkjer (NO) (74) Representative: Coleiro, Raymond, et al  MEWBURN ELLIS York House 23 Kingsway London WC2B 6HP London WC2B 6HP (GB)