MULTI-PURPOSE HATCH LOCKING DEVICE Russian patent published in 2005 - IPC

FIELD: municipal engineering equipment, particularly devices to prevent unauthorized entry into inspection pits of underground pipelines.

SUBSTANCE: device has disc secured to hatch lid, locking screw with wrench head, sliding nut and length-adjustable locking arms connected to sliding nut. Two pairs of guiding posts with row of coaxial orifices are fixedly connected to disc. Cross-arm adapted to be repositioned in accordance with locking degree is secured to above orifices. Smooth end of locking screw is installed in central cross-arm orifice bush. Sliding nut is formed as cross-piece with rocker arm supported by side fingers and surrounding the cross-piece. The sliding nut is connected to locking screw thread. Locking arms in its extreme positions may be brought into contact with limiters fastened to cross-arm. The first ends of locking arms are provided with length-adjustable catches, which cooperate with well wall or with lower surface of support hatch panel during hatch lid locking. The second ends thereof are attached to rocker arm of sliding nut through tension bars and axles.

EFFECT: increased reliability of hatch lid and hatch body fastening to support panel or well wall, possibility to regulate degree of hatch lid locking and increased serviceability.

3 cl, 5 dwg