| 摘要 |
PURPOSE:To prevent the interference of an annular member, by providing elastic pieces which are located in plural positions along the circumference of a blocking ring, correspond to cam portions and can be elastically deformed in the radial direction of the ring. CONSTITUTION:Elastic tongues 7a are provided in three positions around a blocking ring 5 so that the tongues correspond to cam portions 6 and can be elastically deformed inwards in the radial direction of the ring. The elastic tongues 7a are portions of an elastic member 7 and extend integrally from an annular body 7b. The annular body 7b is fitted on the boss 5c of the blocking ring 5. Recesses 7c are provided between the elastic tongues 7a. The annular body 7b is engaged at the recesses 7c with grooves 8 provided on the peripheral surface of the boss 5c of the ring 5, so that the annular body is kept from rotating. The elastic tongues 7a are thus positioned to correspond to the cam portions 6. |
