Abstract: A different material welded joint in which a first member made of a first material and a second member made of a second material having a melting point lower than that of the first material are joined to each other by welded parts at a plurality of welding sections, wherein the first member has a plurality of through-holes respectively corresponding to the plurality of welding sections and a filler material made of the second material is filled in the plurality of through-holes, and wherein apexes of welding beads of the welded parts, which are deposited and formed on a surface of the second member facing the through-holes, are formed independently of each other at each of the welding sections.

Abstract: A back frame structure for a vehicle seat includes: a pair of right and left side frames extending in an up-down direction; and a lower frame configured to connect a lower end side of the right side frame and a lower end side of the left side frame, wherein: at least one side frame out of the pair of right and left side frames is fitted to one connection portion, which is a connection portion of the lower frame with respect to the one side frame, so as to form one fitting portion; and the one fitting portion is configured such that a geometrical-moment of inertia along an axis extending to a predetermined first direction gradually increases from an upper part of the one fitting portion to a lower part of the one fitting portion.

Abstract: A seat frame including: a cushion frame including: a pair of side frames having a cross section that is a closed section; a front frame; a rear frame; and a plate-shaped panel member disposed between the front frame and the rear frame; and a back frame; wherein the panel member is formed of a material having at least one of a higher specific strength and a higher specific modulus than those of the pair of side frames, the front frame, and the rear frame, a rear end side of the panel member is attached to a lower side of the rear frame and lower sides of the pair of side frames, and a front end side of the panel member is attached to an upper side of the front frame and upper sides of the pair of side frames.

Abstract: A vehicle seat includes a lower anchorage that serves as an attachment member for a child safety seat; a bracket; and a base frame that is provided on or above a vehicle body. The lower anchorage is fixed to the base frame via the bracket; and the lower anchorage is integrally assembled to the bracket, with contours of the lower anchorage and the bracket being in contact with each other in a front-rear direction.

Abstract: A back frame structure of a vehicle seat including: first and second side frames; and an upper frame that connects the first and second side frames, wherein the first side frame has a constant cross section and the second side frame has a constant cross section, wherein an outline shape of the cross section of the first side frame and an outline shape of the cross section of the second side frame are in line symmetry with respect to a centerline of the back frame in a left and right direction, and wherein a geometrical moment of inertia of the cross section of the first side frame is larger than a geometrical moment of inertia of the cross section of the second side frame.

Abstract: A vehicle seat including: a cushion frame; a back frame; a recliner; and a clamping plate, wherein the clamping plate is provided with: a burring portion to which a projection portion of the recliner is fitted from an inner side thereof and an outer side thereof is fitted to a loosely fitted through hole of the back frame; and an abutting wall portion which is abutted on a standing wall portion of the back frame from an inner side in a radial direction, and wherein the clamping plate is fixed to the recliner in a state where the clamping plate and the recliner clamp the back frame by fitting the outer side of the burring portion to the loosely fitted through hole, fitting the inner side of the burring portion to the projection portion, and causing the abutting wall portion to be abutted on the standing wall portion.

Abstract: A vehicle seat includes a back frame mounted on a cushion frame is a recliner in a pivotally movable manner. The back frame has a support member connected to the recliner, and a seat back shell supported by the support member. The support member has a side plate portion and a rear plate portion facing a side surface and a rear surface of the seat back shell, respectively, and the side plate portion has a base portion fixed to the recliner, and an extension portion provided to extend more upward than the base portion. The side plate portion is fixed at the extension portion to the side surface of the seat back shell, and the rear plate portion is at least fixed in a region to the rear surface of the seat back shell, the region provided to rise from a lower position of the side plate portion.

Abstract: A back frame structure of a vehicle seat including: first and second side frames; and an upper frame that connects the first and second side frames, wherein the first side frame has a constant cross section and the second side frame has a constant cross section, wherein an outline shape of the cross section of the first side frame and an outline shape of the cross section of the second side frame are in line symmetry with respect to a centerline of the back frame in a left and right direction, and wherein a geometrical moment of inertia of the cross section of the first side frame is larger than a geometrical moment of inertia of the cross section of the second side frame.

Abstract: A back frame of a vehicle seat including: a pair of side frames; an upper frame; and a reinforcing member attached to at least one of the pair of side frames, wherein the at least one of the pair of side frames has a pair of side surface portions and a rear surface portion, wherein the reinforcing member has a pair of side wall portions and a rear wall portion, wherein the rear wall portion is thicker than the pair of side wall portions, and wherein in a state where the reinforcing member is put on the at least one of the pair of side frames, the pair of side wall portions is in contact with and connected to the pair of side surface portions, and the rear wall portion is in contact with and connected to the rear surface portion by bonding or adhesion.

Abstract: A seat frame for a vehicle seat is configured to extend in a specific direction and having a closed cross sectional shape. The seat frame includes: a bent portion having a shape in which a part of a cross section shape of the seat frame is bent inward and outward of the closed cross section; and a shape-changing structure in which a bending shape of the bent portion changes in the specific direction.

Abstract: A headrest includes a stay, a skin material, a cushion material and a dynamic damper. The cushion material is foam-molded integrally with the stay inside the skin material, and has a hollow portion therein. The dynamic damper is attached to the stay, and is disposed in the hollow portion in such a manner as not to abut on the cushion material.

Abstract: A vehicle seat includes: a seat frame that is provided as a strength member and extends in a specific direction, the seat frame including: a closed section frame having a closed sectional shape and extending in the specific direction, an opened section frame having an opened sectional shape and extending in the specific direction in parallel with the closed section frame, wherein the opened section frame is coupled with the closed section in a state to have a closure forming part and a gradually changing structure, wherein the closure forming part forms a closed sectional shape between the opened section frame and the closed section frame, and wherein the gradually changing structure changes the closed sectional shape formed between the opened section frame and the closed section frame at the closure forming part.

Abstract: A vehicle seat including: a reclining plate; a lower arm whose rear region is coupled to the reclining plate; a leg supporting the lower arm; a reinforcing member coupled to the lower arm and reinforcing the lower arm; and a bolt fastening portion including a bolt which penetrates through the reclining plate and the lower arm in a seat width direction to fasten the reclining plate and the lower arm, wherein the reinforcing member includes: a co-fastening portion into which the bolt of the bolt fastening portion is inserted in the seat width direction so as to be fastened together with the reclining plate and the lower arm; a coupling portion coupled to a general surface portion of the lower arm which is positioned out of the co-fastening portion; and a load transmission portion configured to directly transmit a load input to the co-fastening portion to the coupling portion.

Abstract: A back frame structure for a vehicle seat includes a side frame extending in an up-down direction, wherein a webbing is disposed in the vehicle seat, and in a plan view, a direction along which a geometrical-moment of inertia of the side frame is at a maximum inclines toward an inner side of the vehicle seat with respect to a front-rear direction.

Abstract: A back frame attachment structure, wherein a hack frame includes a pair of side frames, wherein a lower end portion side of the side frame is attached to an upper portion of a lower arm member whose lower portion is fixed to a vehicle body side member, wherein the lower arm member includes two plate-like members superimposed with each other in a seat width direction, the upper portion and the lower portion being connected to each other by a front connection portion and a rear connection portion which are separated by a through-hole, and wherein, when a large load is applied to the back frame, the two plate-like members are configured to absorb energy by being deformed to be separated from each other in the seat width direction by a compressive load in an upper and lower direction generated in the front connection portion or the rear connection portion.

Abstract: A back frame structure of a vehicle seat, the back frame structure including: a pair of side frames extending in an upper and lower direction; and an upper frame that connects upper end sides of the side frames in a bridging manner, the upper frame including: a main body part having a substantially inverted U-shaped cross-section opened downward; and a cover member attached to the main body part so as to close at least a part of an opening end side in the cross-section of the main body part.

Abstract: A vehicle seat including: a cushion frame; a back frame; a recliner; and a clamping plate, wherein the clamping plate is provided with: a burring portion to which a projection portion of the recliner is fitted from an inner side thereof and an outer side thereof is fitted to a loosely fitted through hole of the back frame; and an abutting wall portion which is abutted on a standing wall portion of the back frame from an inner side in a radial direction, and wherein the clamping plate is fixed to the recliner in a state where the clamping plate and the recliner clamp the back frame by fitting the outer side of the burring portion to the loosely fitted through hole, fitting the inner side of the burring portion to the projection portion, and causing the abutting wall portion to be abutted on the standing wall portion.

Abstract: A back frame attachment structure, wherein a hack frame includes a pair of side frames, wherein a lower end portion side of the side frame is attached to an upper portion of a lower arm member whose lower portion is fixed to a vehicle body side member, wherein the lower arm member includes two plate-like members superimposed with each other in a seat width direction, the upper portion and the lower portion being connected to each other by a front connection portion and a rear connection portion which are separated by a through hole, and wherein, when a large load is applied to the back frame, the two plate-like members are configured to absorb energy by being deformed to be separated from each other in the seat width direction by a compressive load in an upper and lower direction generated in the front connection portion or the rear connection portion.

Abstract: A seat frame including: a cushion frame including: a pair of side frames having a cross section that is a closed section; a front frame; a rear frame; and a plate-shaped panel member disposed between the front frame and the rear frame; and a back frame; wherein the panel member is formed of a material having at least one of a higher specific strength and a higher specific modulus than those of the pair of side frames, the front frame, and the rear frame, a rear end side of the panel member is attached to a lower side of the rear frame and lower sides of the pair of side frames, and a front end side of the panel member is attached to an upper side of the front frame and upper sides of the pair of side frames.

Abstract: A method of manufacturing a headrest including a stay, a skin material, a cushion material, and a dynamic damper is provided. The method includes arranging the skin material in a molding die, arranging the stay, to which an air bag is attached in such a manner as to cover the dynamic damper, inside the skin material, and injecting a foamable synthetic resin raw material into the skin material to foam-mold the injected foamable synthetic resin raw material integrally with the stay.