| 摘要 |
PURPOSE:To prevent the pressure contact force of an O-ring from being fluctuated when a cover body is loosened and maintain sufficient airtightness by protruding an inner cover on the inside of a cover body so that its outer face is brought into slide contact with the inner face of an opening section, and inserting the O-ring into the circular groove of the outer face. CONSTITUTION:The opening section 8 of a container main body 7 storing a battery is sealed with a cover body 9 having an inner screw 11 screwed to an outer screw 10 formed on its outer face. The inner cover 27 of the cover body 9 is inserted into the opening section 8, an O-ring 29 inserted into a circular groove 28 formed on the outer face of the inner cover 27 is brought into slide contact with the inner face of the opening section 8 at prescribed compressibility, and the airtightness in the container 7 is maintained. The compressibility of the O-ring 29 is not changed even when the cover body 9 is loosened by vibration or the fastening force is changed, and airtightness is maintained without trouble. |
