(19)

(11)

EP 3 791 039 A1

(12)

(43) Date of publication: 17.03.2021 Bulletin 2021/11 (21) Application number: 19727142.2 (22) Date of filing: 23.04.2019

(51) International Patent Classification (IPC):  E05F 15/70(2015.01) E05F 15/73(2015.01) (86) International application number: PCT/US2019/028652 (87) International publication number: WO 2019/217062 (14.11.2019 Gazette 2019/46)

(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: 10.05.2018 CN 201810442854 (71) Applicant: Carrier Corporation Palm Beach Gardens, FL 33418 (US)	(72) Inventor: ZHANG, ChaoChang Shanghai 201206 (CN) (74) Representative: Dehns  St. Bride's House 10 Salisbury Square London EC4Y 8JD London EC4Y 8JD (GB)