| 摘要 |
<p>Radial pawls radially movable within seats (320) formed in the shaft (301) (and possibly in a thickening (301A) thereof) cooperate through their external asymmetric ends (322A, 322B) with nonsymmetrically shaped seats (318) peripherally disposed in a housing of the drive member (312); in the shaft an axial cavity (324) houses an axially movable, shaped core (326), with elastic means (328) reacting to the axial movement of said core, caused by said pawls due to the centripetal thrust of the pawls in the direction of rotation opposite to that causing the motion transmission, the central core having a frustoconical surface (326A) apt to cooperate with the inner ends of the pawls.</p> |
