(19)

(11)

EP 3 877 613 A1

(12)

(43) Date of publication: 15.09.2021 Bulletin 2021/37 (21) Application number: 18822255.8 (22) Date of filing: 06.11.2018

(51) International Patent Classification (IPC):  E05B 19/20(2006.01) (52) Cooperative Patent Classification (CPC): E05B 19/20; E05B 19/205 (86) International application number: PCT/BG2018/000042 (87) International publication number: WO 2020/093112 (14.05.2020 Gazette 2020/20)

(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 (71) Applicant: Ivaylov, Georgi Angelov 1379 Sofia (BG)	(72) Inventor: Ivaylov, Georgi Angelov 1379 Sofia (BG) (74) Representative: Shentova, Violeta Varbanova  11, Damyan Gruev Street 1606 Sofia 1606 Sofia (BG)