LOCKING AND UNLOCKING DEVICE USING BUFFER KEY ON BUFFER INTEGRATED CLOSURE FRAME OF BUFFER OPENING FOR KEY PASSAGE

摘要

The present invention relates to a device for locking and unlocking with the aid of a key of a buffer on a frame with integrated closure cap of a buffer opening for the passage of the key. According to the invention, the device is characterized in that the rotor (11) of the latch (6) extends perpendicularly under the buffer (1), the opening opening (4) of the buffer (1), coaxial with the end (11b) rotor (11) engageable with the end (8) of the arm (7) of the key (3), is closed by a plug (18) resting under the pad (1) at its closing position of the opening opening (4) by a return spring (22) and in that the key (3), when introduced into the opening (4), causes movement of the closure plug (18) against the return force of the spring (22) along the rotor (11) whose end (11b) is engaged with the end (8) of the arm (7) of the key (3). The invention finds application in the manholes.