PRESSURE RELIEVING STRUCTURE OF SWITCH

To provide a pressure relieving structure of a switch capable of releasing the internal pressure of the switch without great deformation of the switch and a lid.SOLUTION: In a pressure relieving structure of a switch in which a packing 7 is sandwiched between a lid 3 and the switch to keep the airtightness therein, a lid through hole is provided in an appropriate position on the outer periphery of the lid 3 in a vertical direction, and the switch has an outer edge portion 23 formed by bending the upper end of each side wall outward substantially horizontally, and an outer edge through hole is provided in a vertical direction at a position corresponding to the lid through hole of the outer edge portion 23, and the lid 3, the packing 7, the outer edge portion 23, and a pressure releasing piece 5 that can penetrate in the vertical direction are tightened and fixed by screwing a nut 8 to the lid through hole, the outer edge through hole, and the pressure releasing device 5 through the stepped bolt 4, and the pressure releasing device 5 is plastically deformed to shorten the distance between the upper part and the lower part or cause the upper part and the lower part to be in contact with each other when a load of more than a predetermined vertical upward force is applied.SELECTED DRAWING: Figure 2 【課題】開閉器及び蓋が大きく変形することなく、開閉器の内部圧力を放出できる開閉器の放圧構造を提供する。【解決手段】蓋３と開閉器との間にパッキン７を挟み込んで、内部の気密性を保つ開閉器の放圧構造において、蓋３の外周の適宜の箇所には、垂直方向に蓋貫通孔が設けられ、前記開閉器は、各側壁の上端を外側略水平に折り曲げて形成された外縁部２３が設けられ、外縁部２３の前記蓋貫通孔と対応する箇所には、垂直方向に外縁貫通孔が設けられ、前記蓋貫通孔、前記外縁貫通孔、及び垂直方向に貫通可能な放圧具５に、段付ボルト４を通して、ナット８を螺着することにより、蓋３、パッキン７、外縁部２３、放圧具５が締め付け固定され、放圧具５は、垂直上向きの所定以上の荷重が加えられると、塑性変形して上部と下部の間隔が短くなる、あるいは上部と下部が当接する構成とした。【選択図】図２