Abstract: In a seatback frame for a vehicle seat having a seatback and a seat cushion and equipped with a seat belt of a three-point type, a pipe frame formed along an external shape of the seatback and a vertically extending tower frame located in the seatback at the same side as a belt-through member of the seat belt of the three-point type and fixedly connected to the pipe frame are provided. The tower frame includes an outer side bracket, an inner side bracket, both of which are formed of vertically extending, elongated metal sheets each formed in a substantially C-shaped cross section and both of which are coupled to one another in abutting engagement with one another to form an internal space, and an intermediate brace member incorporated in the internal space to provide a reinforcement rib structure.

Abstract: In a seatback frame for a vehicle seat having a seatback and a seat cushion and equipped with a seat belt of a three-point type, a pipe frame formed along an external shape of the seatback and a vertically extending tower frame located in the seatback at the same side as a belt-through member of the seat belt of the three-point type and fixedly connected to the pipe frame are provided. The tower frame includes an outer side bracket, an inner side bracket, both of which are formed of vertically extending, elongated metal sheets each formed in a substantially C-shaped cross section and both of which are coupled to one another in abutting engagement with one another to form an internal space, and an intermediate brace member incorporated in the internal space to provide a reinforcement rib structure.

Abstract: In a seatback frame for a vehicle seat having a seatback and a seat cushion and equipped with a seat belt of a three-point type, a pipe frame formed along an external shape of the seatback and a vertically extending tower frame located in the seatback at the same side as a belt-through member of the seat belt of the three-point type and fixedly connected to the pipe frame are provided. The tower frame includes an outer side bracket, an inner side bracket, both of which are formed of vertically extending, elongated metal sheets each formed in a substantially C-shaped cross section and both of which are coupled to one another in abutting engagement with one another to form an internal space, and an intermediate brace member incorporated in the internal space to provide a reinforcement rib structure.