(19)

(11)

EP 3 962 611 A1

(12)

(43) Date of publication: 09.03.2022 Bulletin 2022/10 (21) Application number: 20802127.9 (22) Date of filing: 01.04.2020

(51) International Patent Classification (IPC):  A63B 21/075(2006.01) (52) Cooperative Patent Classification (CPC): A63B 21/075; A63B 21/0726; A63B 2209/00; A63B 2071/0694; A63B 71/0036 (86) International application number: PCT/CN2020/082666 (87) International publication number: WO 2020/224360 (12.11.2020 Gazette 2020/46)

(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: 04.05.2019 US 201916403526 (71) Applicant: Liu, Ping Shanghai 201103 (CN)	(72) Inventor: Liu, Ping Shanghai 201103 (CN) (74) Representative: Ipey  Apex House Thomas Street Trethomas Caerphilly CF83 8DP Caerphilly CF83 8DP (GB)