(19)

(11)

EP 0 819 197 A1

(12)

(43) Date of publication: 21.01.1998 Bulletin 1998/04 (21) Application number: 96909322.0 (22) Date of filing: 04.04.1996

(51) International Patent Classification (IPC):  E01C 11/ 22( . ) (86) International application number: PCT/IE1996/000020 (87) International publication number: WO 1996/031657 (10.10.1996 Gazette 1996/45)

(84) Designated Contracting States: AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE (30) Priority: 06.04.1995 IE 19950000251 (71) Applicant: Twomey, David Rathmore, County Kerry (IE)	(72) Inventor: Twomey, David Rathmore, County Kerry (IE) (74) Representative: Shortt, Peter Bernard, et al  TOMKINS & CO., 5 Dartmouth Road Dublin 6 Dublin 6 (IE)