| 摘要 |
<p>A rubber ring (30) is fitted over each of the annular grooves (11) circumferentially provided on both ends of a cylindrical body (10) while being placed in the fitting notches (22) of support blade units (20), thus holding the support blade units respectively inserted into the elongated grooves (12) axially provided around an outer surface of the cylindrical body. A cover (40) is mounted to each of both ends of the cylindrical body by multiple mounting bolts (50), with a tapered surface (41) provided on an outer end of the cover.</p> |
