An adjustable chair frame with a back and seating surfaces that flex to conform to the shape, weight and movement of an occupant is disclosed. The chair form and proportions provide for a recumbent position that disperses the weight of the occupant more evenly, thereby reducing external and internal physiological point loading. The form also provides ergonomic articulation to minimize internal physiological stresses such as neck/back vertebral compression. Eccentric connections driven by a motor assembly allow positioning adjustment of the components of the chair. Additionally, an air pump assembly may be included to automatically adjust one or more air bladders provided on the interior of the chair frame.

An orthopedic device for improving posture while sitting, having a foundation member including a front portion for upper legs and a bowl portion for lower pelvic area. The bowl portion has a central portion and an upwardly inclined lateral portion. The lateral portion and the front portion collectively surround the central portion. A channel attachment is connected with one or more pelvic crest portions. The channel attachment portion connects over a concave recessed portion. The central portion has plural regions of varying flexibility and the lateral portion has plural regions of varying flexibility.

A chair according to the present invention includes: a leg 1; a leg support pole 13; a support base 4; a movement mechanism 5 located below a seat 2, the movement mechanism 5 provided with plural movement parts 5A, 5B configured to allow the seat 2 to move in a certain area along a predetermined trajectory in a front-rear and left-right directions between the support base 4 and the seat 2, the movement mechanism 5 being a support mechanism configured to support the seat 2 so that the seat 2 moves in the front-rear direction and left-right directions; and plural cover members 71, 72 arranged corresponding to the plural movement parts 5A, 5B. The plural cover members 71, 72 are configured to move relatively in accordance with movement of the plural movement parts 5A, 5B and cover the support mechanism 5.

An adjustable stool having a support connected to a base at one end and seat at the opposite end. A foot rest is adjustably connected to the support. Adjustably connected to the seat is a back support. A lumbar support is adjustably connected to the back support. The back support has a horizontal portion and a vertical portion.

A chair includes a support spine. A seat assembly is coupled to the support spine, and the seat assembly includes a flexible frame being movable relative to the support spine. The flexible frame comprises a first frame element, a second frame element coupled to the first frame element at a first corner, and a third frame element coupled to the second frame element at a second corner. The first corner and the second corner are substantially independently movable relative to the support spine. A conformable panel is coupled to the flexible frame and configured to engage an occupant of the chair. A resistance assembly couples the support spine to the flexible frame. The resistance assembly bears against the flexible frame to facilitate substantially independent movement of the first corner and the second corner relative to the support spine.

A piezoelectric adaptive mesh includes multiple piezoelectric fibers that include piezoelectric structures that can act as sensor and/or actuators to enhance a person's comfort. The piezoelectric structures communicate with a controller and/or a software processing system and may identify the position of a user and make adjustments through the actuators to increase user comfort by providing support, assistance, treatment, and/or temperature adjustment.

A backrest portion supported, such as to be pivotable around an axis extending along its width direction center line, by a base, a left arm holding portion projecting forward from a left side portion of the backrest portion and supported, such as to be pivotable up and down around its base end portion, by the backrest portion, a right arm holding portion projecting forward from a right side portion of the backrest portion and supported, such as to be pivotable up and down around its base end portion, by the backrest portion, a left leg holding portion extending downward from a vicinity of a left side portion of a front edge of a seat portion at a front side of the base and supported, such as to be pivotable up and down around its upper end portion, by the base, and a right leg holding portion extending downward from a vicinity of a right side portion of the front edge of the seat portion at the front side of the base and supported, such as to be pivotable up and down around its upper end portion, by the base are included.

Variable stiffness apparatuses using an interconnected dual layer fluid-filled cell array. One example of the present apparatuses comprises: a substrate having a first side and a second side; and a plurality of structures coupled to the substrate, where each structure comprises: a flexible first portion having a first end, a second end, and a sidewall extending between the first end and the second end, the first portion defining a first chamber; and a second portion having a first end, a second end, and a sidewall extending between the first end and the second end, the second portion defining a second chamber in fluid communication with the first chamber; where each of the plurality of structures is coupled to the substrate such that the first portion is disposed on the first side of the substrate, and the second chamber is disposed on the first side or the second side of the substrate.

An office chair comprises a seat element (3) mounted movably on a fixed support element (1) and a back support element (2). The arrangement simultaneously allows the seat element (3) to move and tilt backwards when the user leans backwards. The seat element (3) carries the chair seating panel (4) in such a way that when the user leans to a side, said chair seating panel (4) tilts to the same side according to the user's movement and independently of the chair's back element (2).

An office chair comprises a seat element (3) mounted movably on a fixed support element (1) and a back support element (2). The arrangement simultaneously allows the seat element (3) to move and tilt backwards when the user leans backwards. The seat element (3) carries the chair seating panel (4) in such a way that when the user leans to a side, said chair seating panel (4) tilts to the same side according to the user's movement and independently of the chair's back element (2).