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Pub. No.:    WO/2017/157230    International Application No.:    PCT/CN2017/076137
Publication Date: Fri Sep 22 01:59:59 CEST 2017 International Filing Date: Fri Mar 10 00:59:59 CET 2017
IPC: A44B 19/34
Applicants: ZHENG, Yunting
Inventors: ZHENG, Yunting
A double-layered closing zipper, comprising a zipper base (1), an upper chain (2), a lower chain (3), and a steel tape measure (4). The zipper base (1) is provided with a left upper groove (5), a right upper groove (6), a left lower groove (7), and a right lower groove (8). The upper chain (2) comprises a left upper chain (9), a right upper chain (10), a zipper head closing element (11), and a zipper tail closing element (12). The lower chain (3) comprises a left lower chain (13) and a right lower chain (14). The steel tape measure (4) comprises a housing (15) and a steel tape strip (16). The steel tape strip (16) is arranged above the zipper base (1). The left upper chain (9) is provided with left upper teeth (18), left insertion-proof plates (19), and left upper tape (20). The right upper chain (10) is provided with right upper teeth (21), right insertion-proof plates (22), and a right upper tape (23). When in use, the double-layered closing zipper is arranged on a piece of luggage, the left insertion-proof plates (19) and the right insertion-proof plates (22) are utilized to close the corresponding gaps between the left upper teeth (18) and the right upper teeth (21), and the steel tape strip (16) of the steel tape measure (4) is utilized to close the two chains, thus increasing the difficulty for a criminal to open the zipper by inserting a sharp tool.