摘要 |
PROBLEM TO BE SOLVED: To enable a drain plug of a tank reserving a liquid to be opened and closed by a magnetic force.SOLUTION: A drive mechanism 150 is incorporated for driving a drain plug 130 into a wall surface of an elbow 110 attached to a lower part of an exhaust port. The drive mechanism 150 makes an arm 151 protrude from the wall surface by rotating the arm 151 around a revolving shaft 150C and opens the drain plug 130 by pushing up a projection 132b. A transmission member 153 having a large diameter is integrally formed in the drive mechanism 150, and a magnetic force is made to act on a magnet 154 attached to the transmission member 153 from an opening/closing mechanism 140 prepared outside. When moving a driving magnet 143 of the opening/closing mechanism 140, accordingly, the transmission member 153 rotates by a magnetic force and the drain plug 130 can be pushed up by the arm 151. Thus, the drain plug 130 can be opened/closed by using the transmission member 153 having a large diameter and increasing torque even when the magnetic force made to act from the outside is comparatively weak. |