| 摘要 |
The belt tightener on a safety belt retractor comprises a pulling cable which is coupled to a drive source and which engages the periphery of a pulley. The pulley is non-rotatably connected to a gear. The gear is mounted rotatably on a swivel lever or crank which in turn is pivotally mounted on a side wall of the retractor frame. A shear pin has two portions of different cross sections and maintains the swivel crank in an initial position such that the gear is out of engagement with a pinion forming an extension of the belt reel. At the same time the shear pin holds the gear against rotation on the swivel crank. In initiation of a belt tightening operation firstly the weaker dimensioned portion of the shear pin is overcome so that the drive gear is moved into engagement with the pinion. Only thereafter is the second portion of the pin sheared off so that the gear becomes rotatable.
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