| 摘要 |
<p>There is provided a drain pipe ventilating apparatus that prevents water seal from being broken by supplying air to a drain pipe without using a ventilation pipe having a vent hole installed at a high position. The ventilating apparatus to supply the air to the drain pipe includes a first ventilation pipe (1) and a second ventilation pipe (2) each having a spherical body (3, 3A) which freely moves up and down therein is characterized in that: the first ventilation pipe (1) has an opening at a lower end thereof to connect to the conduit at a predetermined point, the second ventilation pipe (2) has an opening at a lower end thereof to serve as an air intake port, an upper end of the first ventilation pipe (1) and an upper end of the second ventilation pipe (2) are communicated with each other so that an air path is formed from the lower end of the second ventilation pipe to the lower end of the first ventilation pipe, and the air path is opened and closed by at least one of the spherical bodies moving up and down in the ventilation pipe in accordance to a force acting on the spherical body. <IMAGE></p> |
