Height-adjustable vehicle seat having a crash blocking unit

1. A vehicle seat comprising:

a locking unit;

at least one multi-bar linkage for adjusting the seat height, said multi-bar linkage being defined by at least five transmission links, wherein, during normal operation of the vehicle seat, the multi-bar linkage is effective as a four-bar linkage because of the locking unit being effective between at least two transmission links of the at least five transmission links; and

a crash blocking unit locking at least one frame, which is fixed on the vehicle structure, and a rocker, as two of the at least five transmission links, to each other such that the multi-bar linkage acts as a three-bar linkage, wherein:

a further transmission link of the at least five transmission links is arranged between the frame and the rocker;

in the event of a crash, because of a load-controlled unlocking of the locking unit the multi-bar linkage can initially act as a five-bar linkage, as a result of which locking of the crash blocking unit can be triggered;

the crash blocking unit is lockable by an inertia-controlled pawl of the crash blocking unit independently of a load-controlled unlocking of the locking unit;

during normal operation of the vehicle seat, the locking unit locks a carrier rocker as said rocker and a control rocker as said further transmission link, which is mounted rotatably with respect to the carrier rocker, to each other;

the control rocker has a journal which engages in a control groove of the pawl;

the pawl is mounted on the carrier rocker so as to be rotatable about the pawl axis of rotation;

when the locking unit is unlocked, the carrier rocker is rotatable relative to the control rocker;

a rotation of the carrier rocker in at least one direction of rotation relative to the control rocker brings about meshing engagement of the pawl with the toothed segment; and

the pawl is decoupled from the journal in a pivoting direction which leads to meshing engagement between the toothing region of the pawl and a toothed segment region of the toothed segment.

2. The vehicle seat as claimed in claim 1 , wherein the pawl has a toothing region which, under load control, can be brought into meshing engagement with a toothed segment fastened to the frame.

3. The vehicle seat as claimed in claim 2 , wherein the pawl has a toothing region which, under inertia control, can be brought into meshing engagement with the toothed segment fastened to the frame.

4. The vehicle seat as claimed in claim 1 , wherein the pawl is mounted rotatably about a pawl axis of rotation.

5. The vehicle seat as claimed in claim 1 , wherein the rocker is a carrier rocker.

6. The vehicle seat as claimed in claim 5 , wherein the pawl is mounted on the carrier rocker so as to be rotatable about the pawl axis of rotation.

7. The vehicle seat as claimed in claim 1 , wherein the mass center of gravity of the pawl is arranged eccentrically with respect to a pawl axis of rotation of the pawl.

8. The vehicle seat as claimed in claim 1 , wherein the control groove is opened by an opening in a direction facing away from a toothing region.

9. The vehicle seat as claimed in claim 1 , wherein the pawl is arranged axially between the carrier rocker and a reinforcing plate.

10. The vehicle seat as claimed in claim 9 , wherein the reinforcing plate is connected fixedly to the carrier rocker.

11. The vehicle seat as claimed in claim 1 , wherein the pawl has an additional mass which is formed integrally with the pawl.