| 摘要 |
A pair of blocks or shell members of an appliance or the like are mated with each other, and an O-ring is fitted in an O-ring groove provided in the mating end surface of one of the shell members along the entire circumference thereof. In addition, a narrow annular clearance space is provided in a mating plane of the mating end surfaces of the shell members on the side close to the outer peripheral surface of the shell members, when assembled, i.e., radially outwards of the O-ring groove, in a manner to communicate with the exterior of the shell members, so that oil trapped in voids defined between an O-ring, and the walls of the O-ring groove and a mating surface of the counterpart shell, after the assembly of the shell members, may be removed with a cleaning liquid with ease. The annular clearance space may be provided either in the mating end surface of one shell member, in which the O-ring groove is formed, or in the mating end surface of the counterpart shell member having no O-ring groove therein.
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