(19)

(11)

EP 3 678 817 A1

(12)

(43) Date of publication: 15.07.2020 Bulletin 2020/29 (21) Application number: 18797095.9 (22) Date of filing: 05.09.2018

(51) International Patent Classification (IPC):  B24B 7/22(2006.01) B24D 7/16(2006.01) B24B 41/00(2006.01) B24B 41/047(2006.01) B24B 55/02(2006.01) (86) International application number: PCT/IB2018/056761 (87) International publication number: WO 2019/049033 (14.03.2019 Gazette 2019/11)

(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: 08.09.2017 IT 201700100887 U (71) Applicant: Gamba, Francisco 21040 Venegono Superiore (VA) (IT)	(72) Inventor: Gamba, Francisco 21040 Venegono Superiore (VA) (IT) (74) Representative: Giavarini, Francesco et al Zanoli & Giavarini S.p.A. Via Melchiorre Gioia, 64 20125 Milano 20125 Milano (IT)