| 摘要 |
A grating for preventing backflow according to the present invention comprises: a frame forming an outer body in a shape corresponding to a flat surface shape of a drainage hole; an upper plate which is formed in a plate shape extended in a longitudinal direction, is mounted on an upper portion of the frame to allow a longer flat surface thereof to be horizontal, and forms a plurality of upper holes of drain passages formed in a direction perpendicular to the longitudinal direction and separated from each other; an inclined plate extended from one side of the upper plate, and wherein a longer side surface of an upper portion thereof is mounted on the one side of the upper plate; a lower plate which is formed in a plate shape extended in the longitudinal direction, is mounted on a lower portion of the frame and a longer side surface of a lower portion of the inclined surface to allow a longer flat surface thereof to be horizontal, and forms a plurality of lower holes of the drain passages formed in the direction perpendicular to the longitudinal direction and separated from each other; a mounting unit mounted on the other side of the upper plate; and a blocking plate formed from an elastic material, whose upper portion is mounted on the mounting unit, and whose lower portion contacts one side of the lower plate. |
