Patent ID: 7694908

Claim:
A safety belt roller, comprising: a belt shaft as a carrier for a belt that is wound thereon; and a force limiting device, effective in the event of a block event, the force limiting device including a viscous medium-filled housing with a plurality of fixedly positioned disks and a plurality of ring pistons arranged between the disks and connected to the belt shaft for rotation therewith, so that relative movement between the disks and the ring pistons effects trituration of the viscous medium located between the surfaces arranged for this purpose, the level of the force limitation applied by the force limiting device being adjustably settable as a function of the parameters associated with the passengers buckled in by the safety belt unwound from the belt shaft via a variable activation and de-activation of the ring pistons on the belt shaft by means of a switch device operationally disposed between the belt shaft and the ring pistons, wherein the switch device comprises a switch ring that is coupled with the belt shaft, wherein the switch ring is displaceable axially in the housing of the force limiting device via a drive, wherein the switch ring is connected with a positive fit with one or more of the ring pistons as a function of a switch position, wherein the drive acts upon a transmission lever coupled with the switch ring, wherein the transmission lever is guided axially on the housing of the force limiting device and guided out from the housing, and wherein the transmission lever is structured to penetrate a leading projection of the belt shaft through a slot and is fixedly connected with the switch ring.