Vehicle seat

A vehicle seat comprising:

• a seat back frame including:
• left and right side frames that have a plate-shaped portion spreading along a vertical plane orthogonal to a rotational axis around a rotating shaft and extending upward along the vertical plane, a front wall that extends inward from a front edge of the plate-shaped portion and extends vertically from the rotating shaft, and a rear wall that extends inward from a rear edge of the plate-shaped portion and extends vertically from the rotating shaft;
• and
• an upper frame that provides a link between the left and right side frames above the rotating shaft;
• wherein:
• the upper frame includes a front wall that is partitioned by an upper ridge line and a lower ridge line extending in a horizontal direction, an upper wall that spreads rearward from the upper ridge line, an upper standing wall that extends upward from a rear end of the upper wall, a lower wall that spreads rearward from the lower ridge line, and a lower standing wall that extends downward from a rear end of the lower wall;
• an inner edge of the front wall of the side frame has a projecting piece that spreads to the inside from a virtual outline corresponding to a shape of the upper frame and is superimposed to a rear side of the front wall of the upper frame;
• the upper standing wall includes a curved shape portion having a curved shape in a longitudinal cross-sectional view;
• the upper frame has a first flange that extends forward from an upper end of the upper standing wall;
• and
• the first flange extends forward from the upper end of the curved shape portion of the upper standing wall, and has generally a same curvature as a curvature of the curved shape portion in the longitudinal cross-sectional view.

A vehicle seat comprising:

• a seat back frame including:
• left and right side frames that have a plate-shaped portion spreading along a vertical plane orthogonal to a rotational axis around a rotating shaft and extending upward along the vertical plane, a front wall that extends inward from a front edge of the plate-shaped portion and extends vertically from the rotating shaft, and a rear wall that extends inward from a rear edge of the plate-shaped portion and extends vertically from the rotating shaft;
• and
• an upper frame that provides a link between the left and right side frames above the rotating shaft;
• wherein:
• the upper frame includes a front wall that is partitioned by an upper ridge line and a lower ridge line extending in a horizontal direction, an upper wall that spreads rearward from the upper ridge line, an upper standing wall that extends upward from a rear end of the upper wall, a lower wall that spreads rearward from the lower ridge line, and a lower standing wall that extends downward from a rear end of the lower wall;
• an inner edge of the front wall of the side frame has a projecting piece that spreads to the inside from a virtual outline corresponding to a shape of the upper frame and is superimposed to a rear side of the front wall of the upper frame;
• and
• the front wall of the upper frame is provided with a vertical valley fold line and is bent forward along the vertical valley fold line.

A vehicle seat comprising:

• a seat back frame having:
• left and right side frames that have a plate-shaped portion spreading along a vertical plane orthogonal to a rotational axis around a rotating shaft and extending upward along the vertical plane, a front wall that extends inward from a front edge of the plate-shaped portion and extends vertically from around the rotating shaft, and a rear wall that extends inward from a rear edge of the plate-shaped portion and extends vertically from around the rotating shaft;
• and
• an upper frame that provides a link between the left and right side frames above the rotating shaft, wherein
• the upper frame has a front wall that is partitioned by an upper ridge line and a lower ridge line extending in a horizontal direction, an upper wall that spreads rearward from the upper ridge line, an upper standing wall that extends upward from a rear end of the upper wall, a lower wall that spreads rearward from the lower ridge line, and a lower standing wall that extends downward from a rear end of the lower wall,
• an inner edge of the front wall of the side frame has a projecting piece that spreads to the inside from a virtual outline corresponding to a shape of the upper frame and is superimposed to a rear side of the front wall of the upper frame,
• a lower projecting piece that extends inward in a seat width direction is provided at a lower end portion of the inner edge of the front wall of the side frame, and
• the projecting piece protrudes inward in the seat width direction past the lower projecting piece in a front view.

A method for manufacturing a vehicle seat, wherein the vehicle sea comprises a seat back frame having:

• left and right side frames that have a plate-shaped portion spreading along a vertical plane orthogonal to a rotational axis around a rotating shaft and extending upward along the vertical plane, a front wall that extends inward from a front edge of the plate-shaped portion and extends vertically from around the rotating shaft, and a rear wall that extends inward from a rear edge of the plate-shaped portion and extends vertically from around the rotating shaft;
• and
• an upper frame that has a front wall that is partitioned by an upper ridge line and a lower ridge line extending in a horizontal direction, an upper wall that spreads rearward from the upper ridge line, an upper standing wall that extends upward from a rear end of the upper wall, a lower wall that spreads rearward from the lower ridge line, and a lower standing wall that extends downward from a rear end of the lower wall,
• the method comprising:
• linking the left and right side frames by the upper frame above the rotating shaft,
• wherein the linking the left and right side frames by the upper frame includes:
• disposing a projecting piece that is formed at an inner edge of the front wall of the side frame and that spreads to the inside from a virtual outline corresponding to a shape of the upper frame to be superimposed to a rear side of the front wall of the upper frame,
• wherein a lower projecting piece that extends inward in a seat width direction is provided at a lower end portion of the inner edge of the front wall of the side frame, and
• wherein the projecting piece protrudes inward in the seat width direction past the lower projecting piece in a front view.