| 摘要 |
<p>A protection device for offensive odor and vermin installed on an inner side of a manhole lid of a drain, including a plurality of sub devices to prevent offensive odor and vermin assembled in all directions, each of device including an upper opening part where the running water is coming in, an outlet formed in a tilted angle on a lower part of a body section through which running water is discharged, and an open and close door plate installed on the outer side of the outlet that is automatically opened by the weight of the running water and is automatically closed after the running water is discharged by an elastic device separately equipped, includes: the sub device including protruded leafs of certain heights arranged on the tops of all four sides such that upper protruded leafs with a mounting hole are arranged on two sides of the four edges and a lower protruded leaf is arranged on the lower part of the upper protruded leaf in a distance so a certain gap is formed between the upper and lower protruded leaves, mounting holes are arranged on the remaining two sides of the four edges, and a middle protruded leaf formed at the same thickness and the same location as the gap, wherein the plurality of sub devices are installed in the same direction, the middle protruded leaf and the gap are coupled in a putting-in method, a fixing hole is arranged on one end of the most outer rim of the sub device and is screw-coupled to the mounting hole, a supporting plate is hung on the inner rim of the man hole.</p> |
