| 主权项 |
1. A self-locking step-by-step switching mechanism for an adjustment device of a vehicle seat comprising:
a clamping roller lock; and a step-by-step switching device, wherein the clamping roller lock comprises an axis and a release wheel that is rotatable about this axis and comprises a gearing, and wherein the step-by-step switching device comprises
a) an actuating lever mounted pivotably about the axis,b) a driver which is mounted on the actuating lever so as to be pivotable about a driver axis and which has two driver regions cooperating with the gearing of the release wheel, of which only one, respectively, is in engagement with the gearing in one direction of rotation of the release wheel, respectively, of which both are out of engagement with the gearing in a central position of the actuating lever, and of which one comes into engagement with the gearing and rotates the release wheel when the actuating lever is pivoted out of its central position, whereas the other remains out of engagement with the gearing,c) a drag lever comprising supporting surfaces that enter into contact with the driver,d) a zero-position spring arranged on the actuating lever, ande) a spring, wherein the spring comprises at least one projection, the drag lever comprises at least one indentation which is normally in engagement with the projection, and the spring is fixed against rotation. |
