A cushion for a chair including a seat member and a back-supporting member, wherein the seat member includes two ischium-facing portions, a surface of each ischium-facing portion abutting an ischium of the user and having a specific three-dimensional curved surface; and the back-supporting member includes an ilium upper border-facing portion and a lower ribs-facing portion, a surface of the ilium upper border-facing portion abutting an ilium of the user and being entirely concavely curved in a transverse cross section along a left-right direction, a surface of the lower ribs-facing portion abutting the lower ribs of the user and being entirely concavely curved in the transverse cross section along the left-right direction, and a portion of the back-supporting member upper than the lower ribs-facing portion having a specific three-dimensional curved surface.

A cushion for a chair including a seat member and a back-supporting member, wherein the seat member includes two ischium-facing portions, a surface of each ischium-facing portion abutting an ischium of the user and having a specific three-dimensional curved surface; and the back-supporting member includes an ilium upper border-facing portion and a lower ribs-facing portion, a surface of the ilium upper border-facing portion abutting an ilium of the user and being entirely concavely curved in a transverse cross section along a left-right direction, a surface of the lower ribs-facing portion abutting the lower ribs of the user and being entirely concavely curved in the transverse cross section along the left-right direction, and a portion of the back-supporting member upper than the lower ribs-facing portion having a specific three-dimensional curved surface.

A seat for vehicles includes: a seat back frame; and a pressure receiving member that is mounted on the seat back frame to support a back of an occupant. The seat back frame includes a lower seat back frame and an upper seat back frame mounted on an upper portion of the lower seat back frame in a forwardly and rearwardly swingable manner, and the pressure receiving member is disposed from an area corresponding to the shoulder of an occupant to an area corresponding to the waist of the occupant and is supported by the upper seat back frame.

A rest component (14), (16) for an article of furniture (10) includes a body member (32) defining a plurality of surfaces (34). A cover member (36) is carried by at least one surface (34) of the body member (32) to define a pocket (38) associated with the at least one surface (34), the pocket (38) defining a mouth to enable a user to gain access to an interior of the pocket (38). At least one passage (24) is defined by at least one of the body member (32) and the cover member (36) and opening out into the pocket (38). The passage (24) is configured to accommodate an elongate element which extends through the passage to exit from an operatively bottom region of the body member.

A rest component (14), (16) for an article of furniture (10) includes a body member (32) defining a plurality of surfaces (34). A cover member (36) is carried by at least one surface (34) of the body member (32) to define a pocket (38) associated with the at least one surface (34), the pocket (38) defining a mouth to enable a user to gain access to an interior of the pocket (38). At least one passage (24) is defined by at least one of the body member (32) and the cover member (36) and opening out into the pocket (38). The passage (24) is configured to accommodate an elongate element which extends through the passage to exit from an operatively bottom region of the body member.

An article of furniture (10) includes a platform (12). A seat base (14) is mounted to the platform (12) to leave at least a part (16) of the platform (12) not covered by the seat base (14). At least one rest (20) is displaceably mounted relative to the platform (12) to enable access to be gained at least to that part (16) of the platform (12) not covered by the seat base (14). An attaching mechanism (22) is carried by the part (16) of the platform (12) for displaceably attaching the at least one rest (20) to the platform (12).

An article of furniture (10) includes a platform (12). A seat base (14) is mounted to the platform (12) to leave at least a part (16) of the platform (12) not covered by the seat base (14). At least one rest (20) is displaceably mounted relative to the platform (12) to enable access to be gained at least to that part (16) of the platform (12) not covered by the seat base (14). An attaching mechanism (22) is carried by the part (16) of the platform (12) for displaceably attaching the at least one rest (20) to the platform (12).

An ergonomically improved chair in which the user's thoracic region is supported by a narrow and generally flat or moderately convex thoracic cushion in the midrest region of the chairback. The design omits or greatly minimizes support for the user's scapulae and other areas of the back outside the thoracic region, excepting lumbar and cervical support features in some embodiments. The design differs from the prior art at least in that the thoracic cushion is narrow and configured not to complement that user's spinal curvature. By appropriate selection and design, a chair incorporating the invention may comprise a fabric covering portions of the chairback without significantly affecting functionality. Other embodiments include a chairback comprising regions having differing levels of firmness and/or differing cushion height at appropriate regions to promote concentrated support of the user's thoracic region.

A chair back height adjustment mechanism comprises a guide having an abutment surface at a lateral side of the guide which extends along an adjustment direction. The chair back height adjustment mechanism comprises an adjusting device supported on the guide so as to be displaceable along the adjustment direction. The adjusting device comprises a carrier, a coupling member which is moveably supported on the carrier, and a bias mechanism. The coupling member has a contact face shaped to abut on the abutment surface of the guide and a slanted face. The bias mechanism is operative to apply a force onto the slanted face to urge the contact face of the coupling member against the abutment surface of the guide.

The disclosure herein relates to lumbar support adjustment for a chair. More specifically, the disclosure related to a lumbar support adjustment mechanism that moves forward and aft relative to the user.