HATCH LID LOCKING MECHANISM Russian patent published in 2009 - IPC E02D29/14 

FIELD: construction.

SUBSTANCE: invention deals with the inspection pits, hatches and other facilities for underground pipeline, water supply networks and sewage pipeline inspection and maintenance. Particularly, the invention relates to mechanisms preventing access of unauthorised persons into inspection pits. The mechanism is intended for lid locking and includes mechanism housing with collar where lid is installed. In the centre of the mechanism, there is a lock screw with head matched for the special wrench and sliding nut, which is connected cinematically with locking levers. The specific feature of this mechanism is no less than three brackets, which are rigidly connected with sliding nut and diverged in radial direction from the above nut. The holders are fixed to brackets ends. There is a locking lever installed axially in the groove of each holder. When lid is closed, the bottom end of the lever is coupled with the housing collar, whereas the upper end rests against the lid. The whole mechanism is suspended on the lock screw with tapered head being placed into the tapered opening in the lid. Nut restrainer is fixed to the lock screw from the opposite side. The restrainer is represented with screw head fixed to the end of lock screw. The locking lever and holder are connected with each other by means of spring turning the lever around axis and pressing the upper lever end to the hatch lid. Thus, the proposed mechanism may be widely used for locking off-the-shelf hatch lids in water supply and sewage pipeline inspection pits.

EFFECT: simplifying locking mechanism design to a substantial extent and reducing metal consumption during production together with overall dimensions; mechanism operation without substantial modernisation of standard hatch lid.

2 cl, 2 dwg