(19)

(11)

EP 2 971 504 A2

(12)

(88) Date of publication A3: 02.07.2015 (43) Date of publication: 20.01.2016 Bulletin 2016/03 (21) Application number: 14716014.7 (22) Date of filing: 12.03.2014

(51) International Patent Classification (IPC):  E21D 11/10(2006.01) (86) International application number: PCT/IB2014/059661 (87) International publication number: WO 2014/141083 (18.09.2014 Gazette 2014/38)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA ME (30) Priority: 12.03.2013 IT MI20130377 (71) Applicant: CIFA SpA 20030 Senago (MI) (IT)	(72) Inventors: BERTINO, Eugenio I-20100 Milano (IT) LANTICINA, Giuseppe I-20010 Marcallo Con Casone (IT) (74) Representative: Petraz, Davide Luigi et al GLP S.r.l. Viale Europa Unita, 171 33100 Udine 33100 Udine (IT)