Seat underframe for motor vehicle seats
A seat underframe for motor vehicle seats, with two pairs of rails arranged at a distance from each other and each having a seat rail and a floor rail, a seat carrier, in each case two pivoting arms which are connected at one end in an articulated manner to the seat carrier and at the other end in an articulated manner to the seat rails and fix the maximum distance between the seat carrier and the seat rails, and a drive unit adjusting the seat carrier between a lower starting position and an end position. The drive unit for adjusting the seat carrier is formed beyond a height end position which is fixed during normal operation.
1. A seat underframe for motor vehicle seats, comprising:
two pairs of seat rails arranged at a distance from each other and each having a seat rail and a floor rail,
a seat carrier configured to be moved relative to the two pairs of seat rails between a lower starting position and an end position,
a front pivoting arm and a rear pivoting arm that are each articulated at one end to the seat carrier and at the other end to one of the seat rails and fix the maximum vertical distance that can be achieved between the seat carrier and the seat rails as the seat carrier is moved between the lower starting position and the end position,
wherein the one end of the rear pivoting arm is articulated to the seat carrier, and the other end of the rear pivoting arm is articulated to one of the seat rails through a seat rail pivot bolt,
wherein the seat carrier is in a highest position at the maximum vertical distance between the seat carrier and the seat rails, and
a drive unit that adjusts the seat carrier between the lower starting position and the end position,
wherein one end of the drive unit is articulated to the seat carrier, and the other end of the drive unit is articulated to a cantilever arm of the rear pivoting arm through a cantilever pivot bolt on the cantilever arm,
wherein the seat rail pivot bolt of the rear pivoting arm and the cantilever pivot bolt are arranged such that the cantilever pivot bolt and the other end of the drive unit are vertically movable above and below the seat rail pivot bolt,
wherein the drive unit is designed to move the seat carrier along a path of movement from the lower starting position to the highest position and then to the end position,
wherein the highest position is positioned between the lower starting position and the end position along the path of movement,
wherein the drive unit includes at least one sensor configured to detect whether the motor vehicle seat is occupied to prevent the seat carrier from moving to the highest position and the end position when the motor vehicle seat is occupied,
wherein the drive unit is formed by a spindle drive.
2. The seat underframe according to claim 1 , wherein the drive unit is designed to move the seat carrier into the highest position at the maximum vertical distance.
3. The seat underframe according to claim 1 , wherein the drive unit is designed to move the seat carrier into the end position that is arranged longitudinally beyond the highest position, wherein the highest position is arranged longitudinally beyond the lower starting position of the seat carrier.
4. The seat underframe according to claim 1 wherein the drive unit is designed to change in length, and one end is articulated to the seat rail, and the other end is articulated to the seat carrier.