US Patent 7967385 Hinge mechanism and vehicle seat comprising such a mechanism

Hinge mechanism comprising first and second frames connected together by an adjustment device comprising a first set of gear teeth integral with the first frame and a first mobile toothed component engaging with the first set of gear teeth. The second frame comprises a second set of gear teeth, which interferes with the first frame when the torque applied between the first and second frames exceeds a predetermined threshold, in order to immobilize the frames rotatably in relation to each other.