| 摘要 |
<p>A device (1) for mutual retention and disengagement between a shaft (3) and a hub (5) of an articulation fork (7), comprising a sleeve (9) that is fitted slidingly on the hub (5) and a spring (11) that is also fitted on the hub (5). The hub (5) comprises at least one radial seat (19) that accommodates a respective locking ball (17), which can move along said radial seat (19) to exert a force for retaining the shaft (3) in the hub (5). The sleeve (9) comprises an annular collar (13) that protrudes radially toward the inside of the sleeve (9) and is adapted to engage an annular recess (15) provided in the hub (5). The sleeve (9) can slide, in contrast to the axial thrust force exerted by the spring (11) on the sleeve (9), from a configuration for retention of the shaft (3), in which the annular collar (13) prevents the radial outward movement of the locking ball (17) in order to exert the force for retention of the shaft (3) in the hub (5), to a disengagement configuration, in which a portion of the annular collar (13) is anchored to a portion of the annular recess (15) and the locking ball (17) stops exerting the force for retention of the shaft (3) in the hub (5). The sleeve (9) can be off-centered axially with respect to the hub (5) in the transition from the retention configuration to the disengagement configuration due to the difference of the force exerted by an operator on the sleeve (9) in the step for transition from the retention configuration to the disengagement configuration.</p> |
