According to the present invention, in a plan view of a seat surface (10a), a plane area of a part surrounded by an inner edge (17a) of a rear part (17) in a left-right direction (X) and a contour (L) is larger than a plane area of a part sandwiched by an inner edge (18a) of a front part (18) in the left-right direction (X) and the contour (L) in the left-right direction (X). In addition, a part of a pair of left and right second synthetic resin materials forming a lower part having a maximum gap therebetween in the left-right direction (X) is positioned in a thigh rest part (14) and a part having a minimum gap is positioned in a hip rest part (15), and a maximum value (W1) of the gap between the pair of left and right second synthetic resin materials forming the lower part in the left-right direction (X) is two times or more a minimum value (W2) of the gap in the left-right direction (X).

A folding chair includes front and rear supports that fold and/or retract into central beams to reduce the space occupied by the chair in a folded configuration. A backrest is coupled to the central beams with a hub that allows an angle of the backrest relative to the central beams to be selected and for the backrest to be folded flat relative to the central beams. One or more actuators and pin actuators may control the relative movements of the backrest, front support, rear support, and central beams.

A seating configuration is described. The seating configuration includes a first support surface configured to support the Ischial Tuberosities of a user. The first support surface includes a feature to urge a user into an optimal position on the seat. The seating configuration includes a second support surface positioned adjacent a pelvic-sacral-lumbar region of the user. The seating configuration includes a third support surface positioned adjacent a thoracic-cervical region of the user. The first, second, and third support surfaces, respectively, together can be configured to create a natural alignment of a spinal column of the user.

The subject of the invention is a seat intended to be mounted on chairs, benches with seats, stadium seats, and toilet seats. Characteristic for the seat is that an upper surface 1 of the seat is variously shaped such that from the side of a rear edge 2 it slopes downwards, following an arc, towards a front edge 3 of the seat and the upper surface 1 has rear recesses 4, central recesses 5, front recesses 6, and side recesses 7 arranged thereon, symmetrically in relation to the longitudinal symmetry axis of the seat, where all of which are located within a profiled ergonomic niche 8 with a shape similar to the letter H, while a transverse arm 9 of the profiled ergonomic niche 8 connects longitudinal arms 10 of the profiled ergonomic niche 8 forming a relief groove. The rear recesses 4, central recesses 5, and front recesses 6 have different length and depth, and have an ellipsoidal shape; they are arranged one after the other along the longitudinal arm 10 of the profiled ergonomic niche 8, and the side recesses 7 are arranged between the central recesses 5 and front recesses 6 and side edges 11 of the seat.

A tilting seat for operators in a controlled environment, particularly for surgeons and the like, comprising a saddle, a chest support, a forehead support and a leg support connected to a base standing on the ground, such that the saddle, the chest support, the forehead support and the leg support are integrally movable with rotation about a horizontal-axis joint placed below the saddle, keeping the space over the joint free from movable elements while in use, guaranteeing the substantial lack of contamination in such space.

A voluminous padded chair or cushion forms an all-encompassing supportive structure through a voluminous, substantially donut shaped configuration. The voluminous configuration includes a back portion that supports the back, neck and head of an infant, and a pair of support arms. A front portion provides an anchor for tethering toys and a tray thereto. A base seat for sitting may be adjusted to fit children of different sizes. The base seat is adjusted with a strap having a fastener at one end connected to the base seat. The fastener on the strap removably attaches to the front of the chair such that it can be attached at different vertical points for adjustment purposes. The fastener may be comprised of a hook and loop fastener. The strap is located between holes for the legs and may be adjusted while the chair is occupied by an infant.

A single-person chair includes a proximal end, a distal end, and a generally convex central portion extending between the proximal end and the distal end. The central portion extends upwardly, forming a first pool between the proximal end and the central portion and a second pool between the distal end and the central portion. A backrest is releasably connectable to the proximal end. A longitudinal centerline extends between the proximal end and the distal end. A first sidewall extends between the proximal end and the distal end on a first side of the longitudinal centerline and a second sidewall extends between the proximal end and the distal end on a second side of the longitudinal centerline. A liquid can be contained within the chair between the proximal end, the distal end, the first sidewall, and the second sidewall.

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

Systems, devices and methods including a foundation member comprising: a front Portion configured to receive a user's upper legs, where the front portion comprises a first protrusion and a second protrusion; a pommel configured to guide the user to a proper location on the foundation member, where the pommel is proximate the front portion and between the first protrusion and the second protrusion; and a rear portion configured to receive a user's lower pelvic area, the rear portion comprising a central portion and an upwardly inclined lateral portion, where the lateral portion and the front portion collectively surround the central portion.

The present invention relates to a single-legged portable working chair using a compression repulsive force of a spring body, wherein: when used, the telescopic single-legged portable working chair is worn on a user's body such that, when the user sits down, the spring body is compressed by the weight of the user's body to store power, and when the user stands up, the spring body pushes up the user's body using the compressed power, so that the power consumption required for the sitting and standing actions of the body can be reduced; when the user repeatedly lifts a weight, the load applied to the user's joints and muscles is alleviated by the magnitude of a repulsive force of the spring body.