| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent an inner wire from breaking even when a lateral load is placed on a plunger supporting a drain plug cover.SOLUTION: An operation part which moves up and down a drain plug cover includes: a case; a hollow plunger which is housed in the case, and has the drain plug cover mounted on an upper end part and a lower opening part below and moves up and down through the upper opening part of the case; a bottom plate which is mounted on the lower opening part of the plunger, and has a slidable cylindrical guard at an inner wire; a shock absorber spring which achieves cushioning for the inner wire as the plunger is pushed back downward; an inner cylinder having a receiving plane which is fitted to cover an inner wire tip and moves back in the plunger along the guard part to receive the shock absorber spring; and a return spring which pushes the plunger back into the case. When a load is placed on the inner wire from the plunger, the guard part moves down along the inner wire and the inner cylinder is suppressed from moving down.</p> |
