HATCH LID OPENING DEVICE FOR INSPECTION PIT Russian patent published in 2009 - IPC E02D29/12 

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. The hatch lid-opening device includes lid lifting and turning mechanisms. The specific feature of the device is a turnable section where lid lifting and turning mechanisms are mounted. The turnable section is installed so that it can be mounted or dismounted quickly from the upper hatch plate from the outside. In addition, lifting mechanism is provided with clutched grip to lift the lid by griping the central opening. Lid lifting lever mechanism is comprised of a lifting double-arm lever with axle. The axle is fixed to the stand rigidly connected with the turnable section. In addition, there is a screw pair in the lifting lever mechanism. The screw pair includes a screw affecting lifting lever arm, and a female screw fixed to the turnable section. The lid turning mechanism includes a rod locating in bushing hole. The locating bushing is fixed in the upper plate opening. The turnable section is mounted on the rod so that it can be rotated. The thrust washer is placed on the screw between its collar and female screw. The clutched grip of the lid contains grip with pin inside being tapered at one end. The pin has kinematical connection with drive lever mechanism. The grip is hinged connected with mandrel being installed on lifting lever so that it can move in translational displacement. The lifting lever and mandrel are interconnected by means of elastic linkage limiting mandrel displacement. The structural features of the above device help to reduce physical load, improve easiness and safety for the worker during hatch lid opening operations.

EFFECT: reduction of dimensions and weight.

4 cl, 2 dwg