Under the function of the spring, the elastic airproof ring can generate elastic distortion to cause the circular arc part of the airproof ring to contact with a rollaway nest all the time.
在弹簧的作用下，本实用新型可以产生弹性变形，使密封圈的圆弧部分始终与滚道相接触。
An elastic part is installed on the contact portion of the said inferior fixation part and bracket.
弹性部件，其设置在上述下侧固定部件及支架接触的部位。
An elastic part is installed on the contact portion of the said inferior fixation part and bracket.
弹性部件，其设置在上述下侧固定部件及支架接触的部位。
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