| 摘要 |
A safety belt retractor has a belt spool which is rotatably supported on a frame. A belt slack retightening mechanism is positively coupled to the belt spool to drive the belt spool in a direction upon occurrence of excessive deceleration of the vehicle. A blocking device is operable to block the belt spool from rotation. A control apparatus is provided to control the blocking device in response to acceleration of belt webbing withdrawal from the belt spool. The control apparatus includes a control disc which is supported for limited relative rotation with respect to the belt spool. An inertial disc is coupled with the control disc for rotation therewith by a coupling. The coupling permits rotation of the inertial disc with respect to the control disc only upon the exceeding of a predetermined retightening rotational acceleration of the belt spool and control disc.
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