A tiltable chair includes a flexible seat body including an integrally formed seat back and seat surface supported on a seat frame disposed on upper parts of legs, and the seat back connected to a back frame allowing tilting rearwards, the position of the connection being in an area around the upper part of the pelvis of a person seated thereon. A guide rail having an arc-shaped groove is fixed to the seat frame, and guide members which engage and roll in the arc-shaped grooves are pivotably supported on a shaft bracket of the rear surface of the seat surface. The arc-shaped groove has a high center so that the seat surface undergoes curved motion forward and upward such that the ischium is positioned lower than the lower part of the knees when the seat back tilts rearwards.

The chair has a simple structure in which a seat can follow a free movement of a seated person in front-rear, left-right, and diagonal directions, a burden from an operation by which the seated person balances his or her load can also be reduced, and a movement by which the seated person changes his or her posture stably and continuously can be suitably supported. The chair includes a movement mechanism 3 that causes an upper base unit (31) to swing in a direction of 360 degrees with respect to a lower base unit (32), and a seat 1 attached to the upper base unit (31). The chair further includes a damper mechanism (DM) that may operate by following a movement in a direction of 360 degrees, as a mechanism separate from the movement mechanism (3), at a position connecting the upper base unit (31) and the lower base unit (32).

In the chair, a space between swinging surfaces facing each other can be appropriately unseen. The chair includes swinging surfaces (rolling surfaces) (312a) and (322a) facing each other and has a configuration in which the swinging surfaces (312a) and (322a) swings with respect to each other in directions of 360 degrees including front-rear and left-right directions. In such a chair, an elastic member (33) is arranged to be positioned between the swinging surfaces (312a) and (322a) at least in the vicinity of outer peripheral edges (312z) and (322z), and a stretchable sheet material (60) is provided between the outer peripheral edges (312z) and (322z) to conceal a gap between the swinging surfaces (312a) and (322a) facing each other, the gap including the elastic member (33).

A body support structure includes a frame and a membrane attached to the frame. The membrane includes elastomeric filaments. The membrane has a first region with a first stiffness and a second region with a second stiffness. The second stiffness is greater than the first stiffness. The membrane may form a part of a seat or a backrest.

A body support structure including a pair of laterally spaced apart supporting arms defining a gap therebetween, wherein each of the supporting arms includes an upper support having an upwardly extending upright and a forwardly extending seat support defining a seat part, and a lower support having an upwardly extending upright spaced apart from the upright of the upper support in a vertical plane. The uprights of the upper and lower supports define a backrest part. A pair of armrests each includes an upwardly extending portion connected to a respective one of the forwardly extending seat supports and a forwardly extending portion pivotally connected to the backrest part. A cross brace extends between and is coupled to the supporting arms proximate the pivotal connection. A flexible membrane extends between and is coupled to the supporting arms.

A chair has a seat support, a seat portion, a back portion, and a supporting frame. The supporting frame is formed by a castored base, a height adjustment mechanism, and a main transom. The seat portion is selectively moveable relative to the supporting frame, with the seat portion having a locked configuration and a released configuration. The back portion has a back frame and a compliant cover. The back frame has hood features for receiving a portion of the compliant cover. The back portion is reclinable relative to the supporting frame between an upright position and a reclined position. A recline mechanism has deformable members operatively connecting the seat portion and the supporting frame. A recline resistance mechanism is selectively engageable to resist movement of the back portion toward the reclined position.

A chair includes a base, a support element and a torsion element. The support element is coupled to the base and includes a seat region, a backrest region and a transition region connecting the seat region and the backrest region. The backrest region is reclinable relative to the seat region by way of elastic deformation of the support element. The torsion element is coupled to the base and to the backrest region. The torsion element controls the reclining of the backrest region relative to the seat region. The support element is exclusively connected to the torsion element above a lumbar region, wherein the backrest region can be inclined and/or twisted in relation to the seat region.

A piece of furniture comprises a seat, a backrest and a base. At least the seat and the base are movably coupled for reversible relative adjustment in a direction from a first configuration for sitting upright to a second configuration for sitting reclined. One or more support surfaces and a lever are operably coupled to support the seat on the base. The lever rotates about an axis transverse to the seating direction and moves being coupled with the one or more support surfaces at a first support portion defining first lever arm about the axis and a second, different, support portion defining a second, different, lever arm about the axis. The one or more support surfaces define a curved, noncircular path about the axis, such that relative displacement of the support surface and the axis in the seating direction is associated with rotation of the lever about the axis.

The present shock absorbing structure of an ATV seat for an ATV with a vehicle frame and a seat frame, comprising an elastic support member provided between the seat frame and the vehicle frame, the elastic support member supporting the seat frame and allowing the seat frame to move downward and compress the elastic support member when subjected to an external force. The shock absorbing structure further comprises at least one shock absorber block provided between the seat frame and the vehicle frame, the at least one shock absorber block being either attached to the seat frame and having a gap in an up-and-down direction from the vehicle frame, or attached to the vehicle frame and having a gap in the up-and-down direction from the seat frame. The present shock absorbing structure of an ATV seat provides overall enhanced comfort.

A seat, such as a chair or stool, is disclosed and comprises a frame including at least one leg, an undercarriage which is configured to receive the leg, and a seat pan. The seat pan is rotatably mounted to the undercarriage, wherein the seat pan is rotatable about an axis of rotation relative to the undercarriage. The undercarriage also includes a recess and a resilient component in the recess, while the seat pan includes a stop located on a bottom surface of the seat pan. On rotation of the seat pan relative to the undercarriage, such as may occur when the person seated leans forward or back, the resilient component is compressed between the undercarriage and the stop. In one embodiment, an axle passes through the axis of rotation and connects the legs, and potentially backrest if present, to the undercarriage.