HINGE STRUCTURE OF LID FOR UNDERGROUND CONSTRUCTION

摘要

PROBLEM TO BE SOLVED: To safely and easily attach and detach a hinge tool to and from a hinge strike in such a way as to prevent the hinge tool from being disengaged from the hinge strike during the work of opening of a lid main body. SOLUTION: A hinge tool 4 having a spherical stopper part 6 at its lower end is swingably hung from the lower surface of a lid main body 1 and a hinge strike 3 which releasably engages the hinge tool 4 is provided on the inner periphery of a receiving frame 2. The hinge strike 3 comprises an upper step 40 and a lower step 41. The stepped surface 8 between the upper and lower steps 40, 41 is formed with a passing part 9 through which the stopper part 6 can pass only when moved approximately horizontally relative to the hinge strike 3, and the hinge strike 3 is formed with a rear end storage space 10 and a front end storage space which communicate with the passing part 9 to non-releasably hold the stopper part 6.