Device for height and longitudinal adjustment of a steering column of a motor vehicle

A device for effecting height and longitudinal adjustment of a steering column of a motor vehicle, comprising a first adjusting device for height adjusting the steering column;

• a second adjusting device for longitudinally adjusting the steering column;
• a locking device having open and closed positions for simultaneously opening and closing the first and second adjusting devices and including a locking bolt;
• a bracket fixedly securable to a motor vehicle chassis;
• a guide member pivotally supported on the bracket, the locking bolt being supported in the guide member and extending through an opening formed in the bracket, the locking bolt being displaceable in the guide member in a direction of a locking bolt axis and being displaceable, for the height adjustment of the steering column, together with the guide member, transverse to an axial extent thereof and substantially transverse to an axial extent of a steering shaft of the steering column;
• and a steering volume tube having a longitudinal bore extending in an axial direction of the steering shaft and through which the locking bolt extends, the steering volume tube being displaceable in the axial direction of the steering shaft to provide for longitudinal adjustment of the steering column,
• wherein the first adjusting device comprises a lamella stack formed of alternating large and small lamellas through which the locking bolt extends, first and second clamping plates arranged on opposite sides of the lamella stack for clamping same in a closed position of the first adjusting device, and spring means for distancing the first and second clamping plates further away from each other in an open position of the first adjusting device,
• wherein the large lamellas are arranged one of in the bracket and on the bracket with a possibility of changing of spacing therebetween but without a possibility of displacement in a direction of the height adjustment of the steering column, the large lamellas each having an inner recess for enabling displacement of the locking bolt relative to the bracket in the open position of the first adjusting device to enable the height adjustment of the steering column, and
• wherein the small lamellas are arranged for displacement in an axial direction of the locking bolt but without a possibility of displacement relative to the locking bolt in the direction of the height adjustment of the steering column, the small lamellas being displaceable with respect to the large lamellas in the open position of the first adjusting device upon the displacement of the locking bolt relative to the bracket.