Patent ID: 6702299
Filing Date: 2004-03-09
Classification: G01F,G01N,H01M,Y02E

Abstract:
A closure structure with a plug member, comprising:an object to be closed with a plug member, said object to be closed having an opening hole formed thereon; a plug member to be inserted into said opening hole; and a seal member disposed on an outer periphery of said plug member, said seal member being formed of a ring-shaped elastic member, said seal member being to be brought into contact with said object to be closed and said plug member so as to close said object to be closed, wherein: at least an insertion portion of said plug member, which is to be inserted into said opening hole, is smaller than said opening hole, said insertion portion being provided at an outer periphery of a predetermined portion thereof with a seal member-receiving groove, which extends continuously in a circumferential direction of said insertion portion and has a predetermined depth, and said seal member-receiving groove being provided at a predetermined portion thereof, which is placed on a rear side relative to an insertion direction of said insertion portion, with a seal member-seating portion, which has an outer surface with a predetermined diameter, which is smaller than that of said opening hole by a predetermined length and larger than that of a bottom of said seal member-receiving groove; and said seal member has a cross-sectional shape, which can be fitted into said seal member-receiving groove of said plug member, said seal member having an outer diameter, which is larger than a diameter of said opening hole in a mounting state into said seal member-receiving groove, said seal member having an elastic deformability by which said seal member, to which an external force is applied, can be deformed so that a thickness thereof in an axial direction reaches at least said predetermined length, and said seal member having opposite end faces in the axial direction, which serve as contact surfaces coming into contact with said object to be closed with the plug and said seal member-seating portion of said plug member.