发明名称 Manhole cover security lock, esp. for potable water pipeline networks
摘要 The manhole cover has a movable part (3) and a fixed part (4) which is fixed to the enclosed space. An automatic lock (1) is integral with the fixed part and engages with a locking system (2) mounted on the movable part. The automatic lock consists of a bolt (7) engaging in a housing (7') in the movable part. The bolt is guided to slide in a housing (8) in the fixed part by a guide rod (9) fixed to its rear part. A return spring (10) concentrically mounted on the guide rod loads the bolt in the direction of the housing in the movable part. An unlocking lever (5) pivoted at the free end of the guide rod by a pin (11) has a support cam (12) on the face of the fixed part. This cam has a lift of greater length than the travel of automatic interlocking of the bolt.
申请公布号 FR2724687(A1) 申请公布日期 1996.03.22
申请号 FR19940011423 申请日期 1994.09.21
申请人 BELLORINI JACQUES PAUL 发明人
分类号 E02D29/14;E05B17/04;E05B63/24;E05C1/08;(IPC1-7):E05B63/24 主分类号 E02D29/14
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