INSPECTION WELL HATCH LID Russian patent published in 2007 - IPC E02D29/12 E02D29/14 

FIELD: underground engineering structures for populated areas, particularly inspection wells for underground municipal service lines, namely water-supply, sewage, heat-supply, gas-supply and cable systems.

SUBSTANCE: inspection well lid has base, at least one fixed thrust and one movable rotary thrust provided with locking means arranged along a circle from the side of support lid base surface. Locking means is made as indicating member, which retains movable thrust and is damaged during movable thrust rotation. Lid has through orifice and indicating member recess, which are made along movable thrust rotation axis. The recess is formed from outer lid surface. Indicating member conform the recess and is forcedly fitted inside the recess below outer lid surface or is flush therewith. In particular case movable thrust is made as locking plate, which may rotate by key from outer side thereof. The key is inserted from outer lid side in through orifice made in lid. Indicating member is made as plastic plate with members, which prevent indicating member removal from lid and with member and/or members, which cooperate with movable thrust axis to restrict the movable thrust from rotation. Plate blocks access to movable thrust axis. Locking plate may be secured to threaded rod having head to be engaged by wrench with the use of nut. In another particular case lid additionally has orifices for mounting thrust members receiving.

EFFECT: prevention of unauthorized access in inspection well and chambers along with reliable intrusion attempt detection, extended functional capabilities, increased reliability and simplified locking means structure.

4 cl, 3 dwg