| 摘要 |
PROBLEM TO BE SOLVED: To realize a cap structure of a reservoir tank, wherein a looseness and a removal of a cap are prevented from generating by preventing a permanent set-in fatigue of a plate spring of the cap from generating. SOLUTION: This cap for a reservoir tank is equipped with a packing which is joined to the upper side of the peripheral edge of a filling port of a tank, and a plate spring which is engaged with the lower side of the peripheral edge of the filling port, and pinches the peripheral edge of the filling port by an elastic force, together with the packing, on a cap body. In this case, the plate spring 13 has an arch part 13a which is formed by bending into an arch shape at the center, spring pieces 13b which respectively extend from both sides of the arch part, and an engaging part 13c which is provided at the tip of the spring piece respectively, and is engaged with the lower side of the peripheral edge of the filling port of the reservoir tank, and the cap body has a protruding part 11d which fastens the plate spring by engaging with the arch part 13a of the plate spring 13, and at the same time, a plate spring holding part 11b which comes into contact with the top part of the arch part 13a of the plate spring 13 to prevent the plate spring from ejecting, and works a detent of the plate spring as well is formed for the constitution. |
