The product is a three part hinge, one part a door frame mounting body, one part a door mounting body, one part a connecting device linking the mounting bodies together in such a way as to allow the door to swing freely and to maintain the instantaneous axis of rotation of the leaf perpendicular to a horizontal plane during the full operational cycle between the closed and the open condition of the door, the mounting bodies and the related connecting device providing a variable geometry within a multi-axis concealed hinge assembly. The product is predominantly made of steel, stainless steel, aluminium or zamac. The product is not covered by a harmonised European standard (hEN).
Under the CPR, harmonised technical specifications are harmonised European product standards (hENs) established by CEN/CENELEC2 or European Assessment Documents (EADs) produced by the European CPR指令认证的依据是建筑指令欧盟协调标准或欧盟评估文件（EADs）
European Organisation for Technical Approvals (EOTA) as the basis for issuing ETAs for products not covered by hENs.The harmonised technical specification for a product defines EEA-wide methods of assessing and declaring 对于没有被协调标准完全覆盖的建筑产品的认证，可以通过EOTA机构核发ETA认证证书（等同于CE认证书）。
欧盟公告NB机构&TAB机构-捷克TZUS(NB1020)介绍
TZUS是欧盟公告号机构，其欧盟公告号为1020(Notified Body 1020-NB1020)。可以根据欧盟相关规定来签发CE证书。 TZUS同时也是ETA(European Technical Approval)的认证委员之一，可以根据相关法规来签发ETA证书。
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