A system for supporting the human body or a human body segment is provided. The system comprises a base element having a substantially flat shape, and one or more pluralities of shaped modular elements. The base element is flexible, so that it can be brought from an operating, extended configuration to a non-operating, folded configuration. The support system comprises one or more stiffening elements, which are designed in such a way that, on the one hand, they provide the correct stiffness to the backrest when in the operating configuration, and, on the other hand, they do not prevent the possibility of folding the backrest when in the non-operating configuration. The support system can, for example, be made in the form of a seat, a backrest, a mattress, or the like.

A novel lightweight, high stability ergonomic chair, enabling sitting, and leaning in a perched intermediary position between sitting and standing. An inclined saddle type seat is supported by three legs. A forward chair leg is located between the feet of, and beneath the center of gravity of the seated person. Two chair legs extend rearward. The chair permits rocking backwards, diagonally forward, and rocking about the forward chair leg. This “active seating” provides for easy transitions between sitting and standing, shifting of weight, and conveys an open positive body language. Multiple embodiments and architectures are disclosed multiple configurations including; rigid, folding, and for quick disassembly. The chairs may be constructed of various rigid and flexible materials, with optional features including; armrests, footrests, caster wheels, cushioning, and a standing desk type work surface. The chair eliminates the need for connection to a base platform beneath the user's feet.

An automatically adjusting comfort method includes measuring pressure applied by a user via a pressure-sensor array, determining a pressure profile based on measurements from the pressure-sensor array, comparing the pressure profile to a first limit, determining a cumulative pressure profile over a predetermined duration, comparing the cumulative pressure profile to a second limit, and adjusting one or more of a plurality of adjusting mechanisms configured to alter the pressure profile for increased comfort of the user when the pressure profile exceeds the first limit or the second limit. An automatically adjusting comfort system includes a pressure-sensor array communicatively coupled to a controller for determining a cumulative pressure profile over time, and a plurality of adjusting mechanisms configured to alter the pressure profile to increase a user's comfort, wherein the controller automatically adjusts one or more of the plurality of adjusting mechanisms based on the cumulative pressure profile.

A body support assembly includes a seat assembly and backrest assembly supported by tilt control assembly. Methods of using and assembling the body support assembly are provided.

A seat assembly includes a base and a support platform spaced above the base. The support platform includes a pad having a hinge portion defining a flex region, wherein the pad is pivotable about the flex region. A link has a lower portion coupled to the base and an upper portion coupled to the pad, wherein the upper portion is pivotable with the pad about the flex region.

An ergonomic chair has a back support member and means for arranging and supporting legs of the user in an asymmetric configuration, with a first leg extending in front of a body of the user and a second leg aligned with or extending behind the body of the user. An angle between the first and second legs in a side view can be at least 30 degrees. The means for arranging and supporting legs can comprise one or more fixed structures that support the first leg in a first orientation, or one or more dynamic structures that can be positioned by the user to support the first leg in a first orientation. In some embodiments, with the legs of the user in the asymmetric configuration, a centerline of the user is offset from a centerline of the back support member with respect to a lateral direction.

A seat cushion comprises a relief portion to selectively provide cushioning to a user's sitz bones received when the user is seated on a seating surface. The selective cushioning provided by the relief portion to the user's sitz bones can be greater than cushioning provided by the remainder of the seat cushion to portions of the user's body other than the sitz bones. The relief portion can be in the form of a pair of relief pockets offset to be depressed below the second surface. A resiliency of the relief pockets is different from a resiliency of areas of the second surface surrounding the relief pocket. The first surface and the second surface of the seat cushion can be contoured so as to form a central core, a relief portion substantially surrounding the central core, and an outer portion defined so as to surround the relief portion.

A support surface including a cutout on a bottom surface of the support surface. The cutout, which can include a plurality of cutouts, provides a controlled structural collapse of the support surface by varying a stiffness in a cross-section. That is, the area in which the cutouts are positioned collapses more easily than the surrounding area of the support structure, thus making the area with the cutouts perceived as being softer. The cutouts can reduce the peak pressures on the portion of the user's body (for example, the user's ischial tuberosities) that is positioned over the cutouts. The support surface can also include a low-friction interface extending across a top surface of the support 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 vehicle seat includes: a cushion pad in which one or more hanging grooves into which a trim cover is inserted are formed in a sitting-person supporting surface; a wire which is provided in a bottom of the hanging groove along the hanging groove and locks the trim cover which is inserted into the hanging groove; a vibration transferring member which is buried in the cushion pad along the wire; and a vibration body which excites the vibration transferring member.