| 摘要 |
The present invention relates to a highways device, in particular a manhole, with a frame and plug with backward movement relative to the frame to ensure the closed position of 15 the plug in the frame. According to the invention, one of the ends of the self locking arm (30) of said device is pivotally mounted to the frame (20) able to slide in a fixed guide groove (35) so that the end of the arm (3) can bear on a fixed stop (38) of the 20 frame (1) during tilting of the plug (8) to its closed position of the frame (20) to cause the plug (4) to move backwards and allow the latter to correctly close the opening of said frame. The invention is applicable in the highways field. 25 FIGURE 9. 8b 4 40 43 2 30 20 ' 30 14a 14a (D 5 42 41 37 2 36 3 0i :4 |
