Longitudinal adjuster and vehicle seat

1. A longitudinal adjuster for a vehicle seat, the longitudinal adjuster comprising:

at least one rail pair comprising a first seat rail for connection to a seat frame side part, and a second seat rail for connection to a vehicle structure, wherein the seat rails of the seat rail pair are displaceable relative to one another in a longitudinal direction and engage around one another so as to form an internal channel;

a reinforcement profile arranged at least partially in the internal channel, the reinforcement profile being fixed to the first seat rail; and

a connection portion, wherein the reinforcement profile is connected to the connection portion, which connection portion is led rearwardly out of the internal channel and which connection portion is connectable to a rearwardly directed surface, of the seat frame side part;

wherein:

the connection portion has a projection and the seat frame side part has a recess;

the projection of the connection portion can be placed in engagement with the recess of the seat frame side part;

the connection portion has at least another projection to provide a multiplicity of projections;

the multiplicity of projections is arranged on the connection portion of the reinforcement profile;

the projections project forwardly in the longitudinal direction from the connection portion.

2. The longitudinal adjuster as claimed in claim 1 , wherein the connection portion is formed integrally with the reinforcement profile.

3. The longitudinal adjuster as claimed in claim 1 , wherein the connection portion is bent upward, through approximately 90°, about a bend axis running parallel to a transverse direction.

4. The longitudinal adjuster as claimed in claim 1 , wherein:

the reinforcement profile comprises a main body; and

the connection portion projects approximately perpendicularly from a rear end of the main body.

5. The longitudinal adjuster as claimed in claim 1 , wherein the reinforcement profile is manufactured from a metal sheet.

6. The longitudinal adjuster as claimed in claim 1 , further comprising a screw-nut arrangement, wherein the reinforcement profile is fixed to the first seat rail by means of the screw-nut arrangement.

7. The longitudinal adjuster as claimed in claim 6 , wherein a nut of the screw-nut arrangement is secured against rotation relative to the first seat rail.

8. The longitudinal adjuster as claimed in claim 7 , wherein a nut of the screw-nut arrangement is guided in a guide rail arranged in the internal channel on the second seat rail.

9. The longitudinal adjuster as claimed in claim 1 , further comprising a fixing element, wherein the reinforcement profile is held by means of the fixing element on said rearwardly directed surface of the seat frame side part.

10. The longitudinal adjuster as claimed in claim 1 , wherein the projections are arranged pairwise, in particular so as to be oriented forwardly pointing on a left-hand side and on a right-hand side of the connection portion.

11. The longitudinal adjuster as claimed in claim 9 , wherein:

a passage bore is provided in the connection portion; and

a passage bore is provided in the rearwardly directed surface for the purposes of the connection by means of the fixing element.

12. A vehicle seat comprising:

a seat frame side part; and

a longitudinal adjuster comprising:

at least one rail pair comprising a first seat rail connected to the seat frame side part and a second seat rail for connection to a vehicle structure, wherein the seat rails of the seat rail pair are displaceable relative to one another in a longitudinal direction and engage one another so as to form an internal channel;

a reinforcement profile arranged at least partially in the internal channel, the reinforcement profile being fixed to the first seat rail; and

a connection portion, wherein the reinforcement profile is connected to the connection portion, which connection portion is led rearwardly out of the internal channel and which connection portion is connected to a rearwardly directed surface of the seat frame side part;

wherein:

the connection portion has a projection and the seat frame side part has a recess;

the projection of the connection portion can be placed in engagement with the recess of the seat frame side part;

the connection portion has at least another projection to provide a multiplicity of projections;

the multiplicity of projections is arranged on the connection portion of the reinforcement profile;

the projections project forwardly in the longitudinal direction from the connection portion.

13. The vehicle seat as claimed in claim 12 , wherein the connection portion is formed integrally with the reinforcement profile.

14. The vehicle seat as claimed in claim 13 , wherein:

the reinforcement profile comprises a main body; and

the connection portion projects approximately perpendicularly from a rear end of the main body.

15. The vehicle seat as claimed in claim 14 , wherein the longitudinal adjuster further comprises a screw-nut arrangement, wherein the reinforcement profile is fixed to the first seat rail by the screw-nut arrangement and a nut of the screw-nut arrangement guided in a guide rail arranged in the internal channel on the second seat rail.

16. The vehicle seat as claimed in claim 15 , wherein the longitudinal adjuster further comprises a fixing element, wherein the reinforcement profile is held by the fixing element on said rearwardly directed surface of the seat frame side part.