Seat frame for vehicle

1. A vehicle seat frame comprising:

a seat cushion frame;

a seat back frame;

a first coupling bracket configured to couple a first cushion side frame as a side frame of the seat cushion frame on one side of the vehicle seat frame and a first seat back side frame as a side frame of the seat back frame on the one side; and

a second coupling bracket configured to couple a second cushion side frame as a side frame of the seat cushion frame on an other side of the vehicle seat frame and a second seat back side frame as a side frame of the seat back frame on the other side;

wherein the first coupling bracket includes

a first seat-back-side coupling region having a portion to be coupled to the first seat back side frame,

a first cushion-side coupling region having a portion to be coupled to the first cushion side frame, and

a first weak portion that connects the first seat-back-side coupling region and the first cushion-side coupling region together;

wherein the second coupling bracket includes

a second seat-back-side coupling region having a portion to be coupled to the second seat back side frame,

a second cushion-side coupling region having a portion to be coupled to the second cushion side frame, and

a second weak portion that connects the second seat-back-side coupling region and the second cushion-side coupling region together; and

wherein an offset amount in a seat width direction between a surface forming the first seat-back-side coupling region and a surface forming the first cushion-side coupling region at the first coupling bracket is different from an offset amount in the seat width direction between a surface forming the second seat-back-side coupling region and a surface forming the second cushion-side coupling region at the second coupling bracket.

2. The vehicle seat frame of claim 1 , wherein

the first weak portion and the second weak portion are different from each other in their respective shapes.

3. The vehicle seat frame of claim 1 , wherein:

the first weak portion is bent outward from the vehicle seat frame with respect to the first seat-back-side coupling region and the first cushion-side coupling region; and

the second weak portion is bent outward from the vehicle seat frame with respect to the second seat-back-side coupling region and the second cushion-side coupling region.

4. The vehicle seat frame of claim 1 , wherein

the surface forming the first seat-back-side coupling region and the surface forming the first cushion-side coupling region are positioned within a same plane, and

the surface forming the second cushion-side coupling region is positioned inward or outward of the vehicle seat frame with respect to the surface forming the second seat-back-side coupling region.

5. The vehicle seat frame of claim 1 , wherein

the second weak portion is formed to be more easily deformable upon impact absorption as compared to the first weak portion.

6. The vehicle seat frame of claim 4 , wherein

a main driving portion of a height adjustment mechanism configured to adjust a height of the seat is provided only at the first cushion side frame of the first and second cushion side frames.

7. The vehicle seat frame of claim 4 , wherein

a seating sensor mechanism configured to detect seating of a passenger is provided only at the first cushion side frame of the first and second cushion side frames.

8. The vehicle seat frame of claim 3 , wherein deformability upon impact absorption is different between the first weak portion of the first coupling bracket and the second weak portion of at the second coupling bracket.

9. A vehicle seat, comprising the vehicle seat frame according to claim 1 .