(19)

(11)

EP 0 502 973 A1

(12)

(43) Date of publication: 16.09.1992 Bulletin 1992/38 (21) Application number: 91900958.0 (22) Date of filing: 27.11.1990

(51) International Patent Classification (IPC):  E02B 8/ 02( . ) (86) International application number: PCT/NL1990/000177 (87) International publication number: WO 1991/008346 (13.06.1991 Gazette 1991/13)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IT LI LU NL SE (30) Priority: 27.11.1989 NL 19890002930 (71) Applicant: STORK BOSMAN B.V. NL-3265 AE Piershil (NL)	(72) Inventor: BOSMAN, Dirk, Jan NL-3267 BA Goudswaard (NL) (74) Representative: Smulders, Theodorus A.H.J., Ir., et al  Vereenigde Octrooibureaux Nieuwe Parklaan 97 NL-2587 BN 's-Gravenhage NL-2587 BN 's-Gravenhage (NL)