WELL COVER WITH LOCKING MECHANISM (VERSIONS) Russian patent published in 2009 - IPC E02D29/14 

FIELD: construction.

SUBSTANCE: well cover with locking mechanism (version 1) consists of a plate with a lock screw having upper end connected to a steady bush fixed to the said plate so that it can rotate inside it and around its longitudinal axis. There are also lock levers in the locking device, which are linked with the said plate. Each lock lever is hinge-connected with sliding nut actuated by the internally installed lock screw. The plate is hinge-connected with steady bush which is capable of turning vertically. Each lock lever is hinge-connected with steady bush and with one end of a traction mechanism. The other end of traction mechanism is also hinge-connected with the said sliding nut. The supports are fixed to the lower surface of plate. There are joint pins in the supports, which ensure steady bush joining with the plate. The well cover with locking mechanism (version 2) consists of a plate with lock levers being hinge-connected with the above plate. Each lock lever is also hinge-connected with one end of traction mechanism coupled with sliding nut. The latter is screwed on lock screw, which is installed in steady bush. The balancing lever is mounted on sliding nut so that it can swing in vertical plane with regard to the above-mentioned sliding nut. Each end of balancing lever is hinge-connected with the other end of traction mechanism.

EFFECT: improved safety and reliability of cover holding in well during operation.

3 cl, 9 dwg