A cushion pan for a seat cushion is formed from a metal sheet and the cushion pan incudes: an outer frame section that is formed in a frame shape in a seat plan view, a pair of mutually opposing sides of the outer frame section each including a horizontal portion with a respective thickness direction along a seat up-down direction; a pair of side plate portions that extend toward one side in the seat up-down direction from facing end portions of the pair of horizontal portions; and a plate spring portion having a flat plate shape bridging between ends of the pair of side plate portions on an opposite side of the side plate portions from the pair of horizontal portions.

A chair assembly includes a back support arrangement including a back support arrangement, a seat support arrangement and a four-bar arrangement that includes a rearward end and a forward end that is adjustable between a raised and lowered positions, and an arm rest assembly adapted to support the arm of a seated user thereon and supported on the forward end of the four-bar arrangement, wherein the rearward end of the four-bar arrangement is pivotably supported from an arm support structure for pivotable movement about a substantially vertical pivot axis such that the forward end of the four-bar arrangement is moveable between a first position and second position located laterally outward from the first position, and wherein the substantially vertical pivot axis is located forwardly of a rearmost edge of an upwardly-facing surface of the seat support arrangement.

A seat cushion provided for supporting a sitting person, including a seat portion having an upwardly facing surface and a downwardly facing surface; a plurality of mutually spaced inclined grooves formed in the seat portion; wherein the inclined grooves extend along at least a portion of the distance between the upwardly facing surface and the downwardly facing surface.

A seat core member of a seat portion provided with the seat core member made of a hard synthetic resin foam and a cushion layer made of a soft synthetic resin foam and covering the seat core member is provided, and the seat core member includes a plurality of ridges extending in a rising direction of the seat core member in a rising portion of the seat core member being in contact with the cushion layer and opposing to calves of a body is formed.

A control assembly for a chair includes a base structure having a first pivot point and a second pivot point spaced from the first pivot point, a seat support structure having a forward portion pivotably coupled to the base structure for rotation about the first pivot point, a back support structure having a forward portion pivotably coupled to the base structure for rotation about the second pivot point, wherein the back support structure is adapted to move between upright and reclined positions, and wherein the seat support structure reclines rearwardly as the back support structure moves from the upright to reclined positions, and a control link having a first end pivotably coupled to a rearward portion of the seat support structure for rotation about a third pivot point, and a second end pivotably coupled to a rearward portion of the back support structure for rotation about a fourth pivot point.

A chair seat includes a main body, a seat body, and an insert body. The main body has a top body surface defining a groove. The seat body has a base layer and a cushioning layer. The base layer is disposed on the top body surface of the main body, and has a bottom surface that contacts the top body surface of the main body, a top surface that is opposite to the bottom surface, and a through hole that extends from the top surface to the bottom surface and that communicates with the groove of the main body. The cushioning layer is disposed over and is connected to the base layer. The insert body is disposed in the groove of the main body and the through hole of the base layer.

The present disclosure includes systems and techniques relating to stadium seats or a seat cushions composed of materials configured in a sandwich construction. In some implementations, an apparatus, systems, or methods can include a durable bottom layer that is adapted to provide traction on a bottom surface of the portable composite stadium seat cushion, an insulating core layer that is adapted to provide contoured and cushioned support for sitting on the portable composite stadium seat cushion, and a pliable top layer that is resilient and protects the core layer.

A chair back assembly includes a substantially rigid back frame assembly, a back shell member operably supported by the back frame assembly and including a laterally extending top portion, a laterally extending bottom portion and a pair of longitudinally extending side portion extending between the top portion and the bottom portion and cooperating therewith to define an open space therebetween, wherein the pair of side portions are substantially rigid in a lateral direction, and wherein the back shell member is substantially rigid in a lateral direction and substantially flexibly resilient in a fore-to-aft direction, and a cover having a first surface adapted to support a seated user and a second surface opposite the first surface, wherein the cover is positioned over the back shell member to cover at least a portion of the open space.

A trim cover for covering a pad, includes a hook and a skin, wherein: the hook includes: a base portion to which a first end portion of the skin is fixed; and a lock portion that is connected to the base portion and into which a second end portion of the skin is inserted; the first end portion includes: a fixed portion that is fixed to the base portion to be overlapped with a front surface of the base portion; and a folded portion that is folded toward a rear surface of the base portion along an edge of the base portion on a side opposite to the lock portion; and both side portions of the folded portion are arranged to protrude toward the lock portion and arranged to be overlapped with the lock portion and protrude to the outside in the width direction from the lock portion.

A chair assembly includes a back support arrangement that includes a back frame member and a forwardly-facing surface configured to support a user, a four-bar linkage assembly including a first linkage member, a second linkage member, a third linkage member and a fourth linkage member each pivotably coupled to one another such that the four-bar linkage assembly includes an upper end that is adjustable between raised and lowered positions, and an arm rest assembly supported on the upper end of the four-bar linkage assembly, wherein a lower end of the four-bar linkage assembly is pivotably supported from an arm support structure for pivotable movement such that the upper end of the four-bar linkage assembly is movable between a first position and second position located laterally outward from the first position, and wherein the fifth pivot point is located forwardly of the back frame member.