Importance

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Abstract

A belt tightener for seat belts in vehicles comprises a device for moving the belt buckle in a belt-tightening sense and for locking the belt buckle at the end of the tightening movement, which device is activated by a so-called vehicle-sensitive system in response to an acceleration or deceleration in excess of predetermined critical values. In that belt tightener, the bracket which carries the buckle is guided for a longitudinal displacement in a housing, which is connected to the sheet metal frame of the seat or to another part of the vehicle and said housing is provided with means which permit a pull-in movment of the bracket and block its movement in the opposite direction, the belt buckle or the bracket is connected to one end of a preferably tensile element, which at its other end is connected to an energy storage device, which preferably consists of a pre-stressed spring and which in case of relaxation imparts a pull-in movement via the tensile element to the belt buckle, and a locking devie for retaining the spring in its prestressed position is controlled by the vehicle-sensitive system in such a manner that said locking device will be disabled in response to accelerations in excess of a predetermined value.

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First Claim