(19)

(11)

EP 0 314 702 A1

(12)

(43) Date of publication: 10.05.1989 Bulletin 1989/19 (21) Application number: 87904986.0 (22) Date of filing: 14.07.1987

(51) International Patent Classification (IPC):  E01F 13/ 00( . ) E01F 15/ 04( . ) E01F 15/ 00( . ) (86) International application number: PCT/SE1987/000335 (87) International publication number: WO 1988/000628 (28.01.1988 Gazette 1988/03)

(84) Designated Contracting States: AT DE FR GB IT (30) Priority: 14.07.1986 SE 19860003112 (71) Applicant: ANDERSSON, Ake S-193 00 Sigtuna (SE)	(72) Inventor: ANDERSSON, Ake S-193 00 Sigtuna (SE) (74) Representative: Altenburg, Udo, Dipl.-Phys.  Patent- und Rechtsanwälte, Bardehle . Pagenberg . Dost . Altenburg . Frohwitter . Geissler & Partner, Galileiplatz 1 D-81679 München D-81679 München (DE)