| 摘要 |
The thicknesses of a pair of side−wall portions(4)in the width direction are uniform wherever possible.When in use,a load is exerted on the pivot shaft(3)from first and second connection portions(5),(6)that connect together the pair of the side−wall portions(4).Staking portions(13a)that are formed at edge portions of both end faces of the pivot(3b)are formed at half portions of both connection portions(5),(6).Thus,outer peripheries of both ends of the pivot shaft(3b)and inner peripheries of through holes(11)are in contact with each other on the side receiving the load.Accordingly,the load is borne sufficiently at these contact surfaces,and even after a long−term use,play is prevented from occurring at the both end portions of the pivot shaft(3)supported by the pair of the side−wall portions(4). |
