(19)

(11)

EP 4 146 875 A1

(12)

(43) Date of publication: 15.03.2023 Bulletin 2023/11 (21) Application number: 21719634.4 (22) Date of filing: 19.04.2021

(51) International Patent Classification (IPC):  E04B 1/344(2006.01) (52) Cooperative Patent Classification (CPC): E04B 1/3445; E04B 1/3447 (86) International application number: PCT/EP2021/060123 (87) International publication number: WO 2021/223997 (11.11.2021 Gazette 2021/45)

(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 Designated Validation States: KH MA MD TN (30) Priority: 08.05.2020 IT 202000010426 (71) Applicant: Smartech S.r.l. 65013 Citta' Sant'Angelo (PE) (IT)	(72) Inventor: MARCHIONNI, Italo 65123 Pescara (IT) (74) Representative: Cutropia, Gianluigi  Ing. Claudio Baldi s.r.l. Viale Cavallotti, 13 60035 Jesi (AN) 60035 Jesi (AN) (IT)