(19)

(11)

EP 0 697 046 A1

(12)

(43) Date of publication: 21.02.1996 Bulletin 1996/08 (21) Application number: 94911138.0 (22) Date of filing: 09.03.1994

(51) International Patent Classification (IPC):  E01F 13/ 04( . ) (86) International application number: PCT/EP1994/000731 (87) International publication number: WO 1994/025683 (10.11.1994 Gazette 1994/25)

(84) Designated Contracting States: AT CH DE FR IT LI (30) Priority: 28.04.1993 CH 19930001289 (71) Applicants: Berner, Kurt D-72108 Rottenburg (DE) TSCHANZ, Bernhard CH-2540 Grenchen (CH)	(72) Inventors: Berner, Kurt D-72108 Rottenburg (DE) TSCHANZ, Bernhard CH-2540 Grenchen (CH) (74) Representative: Alber, Norbert, et al  Patent- und Rechtsanwälte Hansmann, Vogeser, Dr. Boecker, Alber, Dr. Strych, Liedl Albert-Rosshaupter-Strasse 65 D-81369 München D-81369 München (DE)