发明名称 Locking and unlocking device using a key for a stamp or a cover on a frame, in particular of a manhole cover
摘要 <p>The device has a bolt (8) removably assembled and guided in translation in a housing (10) of a plug. A helical compression spring (13) that is interposed between the bolt and a base wall (14) of the housing maintains the bolt in a locked position. The bolt includes a transversal branch (16) on which an end (7) of a key (3) acts upon for displacing the bolt to an unlocking position of the plug of a frame. The bolt is made of a plastic material i.e. polyacetal.</p>
申请公布号 EP1882779(A1) 申请公布日期 2008.01.30
申请号 EP20070290900 申请日期 2007.07.18
申请人 NORINCO 发明人 JAVAUX, PHILIPPE
分类号 E02D29/14 主分类号 E02D29/14
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