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(11)

EP 0 415 994 A1

(12)

(43) Date of publication: 13.03.1991 Bulletin 1991/11 (21) Application number: 89906210.0 (22) Date of filing: 24.05.1989

(51) International Patent Classification (IPC):  A01B 1/ 02( . ) B25G 1/ 10( . ) A01D 9/ 00( . ) (86) International application number: PCT/SE1989/000291 (87) International publication number: WO 1989/011213 (30.11.1989 Gazette 1989/28)

(84) Designated Contracting States: AT DE FR GB IT NL SE (30) Priority: 24.05.1988 SE 19880001929 (71) Applicant: NORBERGS REDSKAP AB S-591 32 Motala (SE)

(72) Inventors: HEDLUND, Gudrun S-596 00 Skänninge (SE) CEDERQVIST, Tony S-591 61 Motala (SE) THORBLAD, Jan S-573 00 Tranas (SE) ENGSTRÖM, Ove S-583 20 Linköping (SE) ERIKSSON, Mats S-591 72 Motala (SE) GUMAELIUS, Jan S-563 00 Gränna (SE) TORSTENSSON, Kicki S-591 70 Motala (SE) TYLLGREN, Per S-214 65 Malmö (SE) (74) Representative: Willquist, Bo Lorentz  Albihn Willquist AB S:t Larsgatan 23 S-582 24 Linköping S-582 24 Linköping (SE)