Rigidity is improved at a part where side frame pieces overlap each other in a side frame. In a vehicle seat provided with a seat back frame, a side frame of the seat back frame has a first side frame piece and a second side frame piece partially overlapping each other in a direction of extension of the side frame. The side frame has an overlapping part where both the first side frame piece and the second side frame piece overlap each other. At the overlapping part, the side frame pieces overlap each other in a state where a plurality of closed regions and closed by being surrounded by both side frame pieces are formed in a cross section of the overlapping part intersecting with the direction of extension of the side frame.

A method for assembling a tube into a frame part of a vehicle seat comprises the steps of: i) providing a tube such that a first free end of a first side of an end portion of the tube is offset longitudinally relative to a second free end of a second side of the end portion; ii) providing a frame part in the form of a metal plate; iii) arranging the first and second free ends of the tube in contact with the frame part, in two longitudinally offset areas of contact; and iv) successively creating, by means of a same laser, a weld at the first and second areas of contact.

A bracket for attaching an actuator is easily bonded to a side frame while avoiding interference with a shaft for driving a reclining mechanism. In a seat side frame which is provided at each of both ends of a seat back frame in the width direction, a reclining mechanism, and an actuator, the reclining mechanism is attached to a side wall of the side frame, and the actuator is fixed to an attachment bracket bonded to an inner surface of a portion to which the reclining mechanism is attached in the side wall in the width direction. An upper portion which is disposed above the attachment portion of the reclining mechanism and a lower portion which is disposed below the attachment portion thereof are connected to each other at the rear ends thereof and are separated from each other at the front ends thereof.

A sensor disposition structure in a seat includes a cushion pad and a board-like member which is disposed under the cushion pad. A concave is formed in an upper surface of the board-like member, and a sensor is disposed in the concave.

A lever assembly includes a lever housing attached to a seat back of a vehicle seat. The lever assembly includes a bracket attached to the lever housing, and the bracket includes a bracket opening. The lever assembly includes a lever bezel including a bezel opening, the lever bezel is received in the lever housing, and the bezel opening aligns with the bracket opening. The lever assembly includes a lever pivotally mounted to the level bezel and a clip received in the bezel opening and the bracket opening to secure the lever bezel to the lever housing.

A seat frame includes a cushion frame, a back frame, a recliner plate, a bracket arranged to be in contact with a side surface of each cushion side frame, a nut, an end nut, a bolt, and an end bolt. The bracket includes a nut fixing portion and a pipe fixing portion. The bolt is fixed to the nut in a state of being inserted through a bolt hole and a bolt insertion hole. The end bolt is fixed to the end nut in a state of being inserted through an end bolt hole.

A vehicle seat with a speaker-equipped headrest is provided, which is of a relatively simple structure to enable the speaker-equipped headrest to be easily mounted to/dismounted from a seat body after vehicle installation, and also provide increased versatility for installation in vehicles of various vehicle size classes. The vehicle seat with the speaker-equipped headrest includes: a male coupler that is connected to a speaker harness and fitted to a distal end of a headrest stay; and a female coupler that is connected to a main harness on a seat body side, and fitted to a headrest guide bracket supporting a headrest guide. Insertion of the headrest stay into the headrest guide allows the speaker-equipped headrest to be mounted to the seat body, and allows the male coupler and the female coupler to be fitted together to provide a connection between the speaker harness and the main harness.

A vehicle seat back comprising a seat back frame with a pillar, an airbag device and a side airbag, the airbag device comprising at least one airbag and an airbag support for attaching the airbag to the seat back frame, and the side airbag comprising a side airbag trim and at least one side airbag trim support for attaching the side airbag to the seat back frame, wherein the trim support and the airbag support comprise at least one assembly point for their attachment to the pillar of the seat back frame.

A headrest support and a seat headrest in which the headrest support has a U shape and is configured for supporting a headrest. The headrest support includes an inner tube and an outer tube. The outer tube covers at least two end portions of the inner tube. The outer tube is secured to the inner tube by laser brazing.

Described are ergonomic passenger seats that may include monocoque or semi-monocoque seat backs, cellular suspension cushions, and tray tables with support arms that may be located within the interior volume of the monocoque or semi-monocoque seat backs when in their stowed positions. The passenger seats offer enhanced passenger comfort and space while providing a lightweight, simple to manufacture design. Monocoque and semi-monocoque seat backs may form integral parts of passenger seats to support additional loads without need for heavy, complex structures. The space within the monocoque or semi-monocoque seat back may then be used for storage or suspension cushions that offer improved comfort with a lighter seat frame. Monocoque and semi-monocoque seat backs may also facilitate the adoption of several other seating mechanisms, such as new seat mounts that allow for improved seat motion that allows for passenger recline with reduced impingement on other passengers' space.