因此能够避免壳体侧的沟部与外透镜侧的脚部卡合的密封部上产生间隙。
Thus the clearance on the fastening sealing part of the groove part on the shell side and the foot part in the outer lens side is not generated.
上述金属嵌件一端部的内表面为锥形的密封面。
The inner surface at one end of metal insert is cone-shaped sealing surface.
在受压下，密封的一部分进入间隙并且材料挤出到间隙。
Under pressure, part of the seal enters into that gap and material extrudes into the gap.
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