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.

A seat cushion adjuster in one aspect of the present disclosure comprises at least one bracket, at least one slider, and a plurality of interposing members. The plurality of interposing members is disposed between an inner wall of the at least one bracket and the at least one slider so as to interpose the at least one slider among the plurality of interposing members in an inner hollow portion of the at least one bracket. At least one interposing member of the plurality of interposing members comprises at least one supporting protrusion portion protruding toward the at least one bracket.

A seat back frame including an upper frame forming an upper framework of a seat back and extending in a seat width direction, and a side frame forming a side framework of the seat back and extending in a seat height direction, wherein an upper end of the side frame extends in the seat height direction up to a portion of the upper frame extending in the seat width direction, and wherein the side frame includes a general surface portion which is in contact with the upper fame from below with its surface facing the seat width direction, and a flange portion which protrudes from the general surface portion with its surface facing a seat front and rear direction, is in contact with the upper frame from at least one of the front and rear sides, and is welded to the upper frame.

Described are aircraft seat frame assemblies comprising a tube and a seat frame component mounting system. The seat frame component mounting system comprises a first tube mounting member and a second tube mounting member separable from the first tube mounting member. The tube is positionable between the first tube mounting member and the second tube mounting member. The seat frame component mounting system further comprises a fastener extending at least partially through the second tube mounting member, the tube, and the first tube mounting member to couple the second tube mounting member to the first tube mounting member. A clamping force is substantially evenly applied from the second tube mounting member and the first tube mounting member against an outer circumferential surface of the tube via the fastener.

An adequate mechanical stiffness and strength are afforded to a tumble seat or a vehicle seat having a latch mechanism provided in a rear end of the seat cushion. A cushion frame (F1) of the seat includes a side frame (5) extending in a fore and aft direction, and the side frame includes a first member (10) comprising a channel member having an open side facing sideways and a second member (11) attached to the first member so as to form a closed cross section jointly with the first member, and extending downward further than the first member. A latch mechanism is positioned under the first member and attached to the second member.

A vehicle seat core material includes a molded article that includes thermoplastic resin expanded beads. The molded article has a substantially rectangular shape in a top view, and has a front side and a rear side opposite the front side. The molded article has an average density (Z) of 20 kg/m.sup.3 to 50 kg/m.sup.3. The molded article includes, on the rear side of the molded article, a rear thin portion having a thickness of 10 mm to 40 mm, the thickness of the rear thin portion being smaller than an average thickness of the molded article. A ratio (Y/Z) of a density (Y) of the rear thin portion to the average density (Z) of the molded article is 1.05 to 3. The rear thin portion of the molded article has a fusion rate of 70% or more.

An adequate mechanical stiffness and strength are afforded to a tumble seat or a vehicle seat having a latch mechanism provided in a rear end of the seat cushion. A cushion frame (F1) of the seat includes a side frame (5) extending in a fore and aft direction, and the side frame includes a first member (10) comprising a channel member having an open side facing sideways and a second member (11) attached to the first member so as to form a closed cross section jointly with the first member, and extending downward further than the first member. A latch mechanism is positioned under the first member and attached to the second member.

A vehicle seat assembly includes a seat main frame including a seat back attached to the seat main frame. The vehicle seat assembly also includes left and right side members in which each side member defines an outboard seat back bolster and an armrest. The armrest has a forward attachment bracket for attachment to the seat main frame. The vehicle seat assembly also includes a seat base including a seat base frame attached to the seat main frame and left and right corner cover members separate from the respective left and right side members and the seat base. Each corner cover member is adapted to cover the forward attachment bracket of the corresponding side member. Further, the left and right corner cover members conceal the attachment of the left and right side members to the seat main frame.

A vehicle assembly includes a vehicle body including a side body component and a transverse body component, and a vehicle seat attached to the each of the side and transverse body components. The vehicle seat includes a seat main frame including an attached seat back, a side member attached to the seat main frame, the side member defining an outboard bolster for the seat back and an armrest, and a seat base attached to the seat main frame. A first connection bracket is secured to the transverse body component adjacent an outboard side edge portion of the seat back, and the outboard bolster of the side member is connected to the first connection bracket. A second connection bracket is secured to the side body component and extended toward the seat main frame, and the armrest of the side member is connected to the second connection bracket.

Disclosed is a seat for a vehicle configured to variously adjust a seat position between, for example, a full-flat mode, a relaxation mode, a cushion tip-up mode, a full-bed mode, a walk-in mode, and a rear-view mode using a first hinge shaft to rotate the entire seat, including a seatback and a seat cushion, and a second hinge shaft to rotate the seatback.