A device for locking and unlocking with the aid of a cycle of a plug or cover on a frame, in particular, of a merck sharp amp; dohme chaussee

摘要

The present invention relates to a device for locking and unlocking with the aid of a key of a plug or cover on a frame, in particular, of a manhole. According to the invention, the device is characterized in that the bolt (14) of the bolt (13) comprises two radial fingers (17) are aligned along a direction parallel to a flat web (4) of the cover (3) able to cooperate, when the lid (3) occupies a position for closing the frame (2), with two ramps (36, 41) are respectively integral with the frame (2) and of the cover (3), so as to exert on the cover (3) a constraint for locking the frame (2), increasing as the fingers (17) of the bolt (14) which move along the ramps (36, 41) until the fingers (17) are in their locking position of the cover (3) to the frame (2) to which one of the two fingers (17) of the bolt (14) is held captive in the recess (16) of the frame (2). The present invention finds application in the field of the road-system equipment.