A multi-gear adjustable support mechanism includes a base plate, a support plate, a support element, a gear forming element having gear grooves and a limiting part and a gear controller having an abutting part and a platform. The support element includes a support crossbar for supporting the support plate at a different angle from the base plate. A moving surface of the gear forming element bears and supports the movement of the support crossbar. The platform is aligned with the moving surface at the position of the gear groove closest to the limiting part when the support crossbar moves and reaches the limiting part. The support crossbar moves on the surface of the platform part and passes the gear groove when the support crossbar returns from the limiting part. An adjustable seat is provided including the multi-gear adjustable support mechanism.

A reclining seatback support device which mainly includes at least one seatback support and a seatback body is revealed. The seatback body and an upper end of the seatback support are provided with pivot bracket portions pivotally connected to each other while a lower part of the seatback body and the seatback support are connected by a swing arm. When a user is sitting and lying down on the back, the seatback body is rotated around the pivot axis where the seatback body is pivotally connected to the upper end of the seatback support and then reclined at a certain angle. By elastic segments of the seatback body and the swing arm between the lower part of the seatback body and the seatback support for pulling and limiting the seatback body, the user can lean on the seatback body comfortably and safely.

A body support structure includes a frame and a membrane attached to the frame. The membrane includes elastomeric filaments. The membrane includes different regions with different stiffness. The membrane may form a part of a seat or a backrest.

A rebounding device includes a front member, a rear member, and a spring mechanism including a first biasing element and force adjustment assembly. The force adjustment assembly includes a spring element including a front planar surface and a rear planar surface connected at a rounded portion, wherein the front planar surface contacts an inner surface of the front member; a screw housing secured to an inner surface of the rear member, wherein the screw housing includes a longitudinal channel and a bore on an upper surface; a drive screw positioned through the bore and along the longitudinal channel of the screw housing; a threaded block positioned within the longitudinal channel of the screw housing, wherein the threaded block is configured to move vertically along the longitudinal channel, and wherein the rear planar surface of the spring element is secured to the threaded block.

A seating arrangement includes a base, a lower shell including a first portion coupled to the base and comprising a substantially horizontal portion, a curved transition portion and a backrest portion, a pair of laterally spaced front links extending upwardly from a forward portion of the first portion, a rear link extending upwardly from a rearward portion of the first portion of the lower shell and forwardly of the transition region of the lower shell, and an upper shell comprising a seating portion coupled to the pair of front links and to the rear link, a curved transition portion spaced apart from the curved transition portion of the lower shell and defining an open lateral pass through therebetween, and a backrest portion connected to the backrest portion of the lower shell.

Disclosed herein is a chair that includes a backrest portion, a seat portion coupled with the backrest portion, a column portion coupled with the seat portion, a linkage coupled with the backrest portion, a leaf spring in direct contact with the linkage, an arc-shaped toothed structure fixed translationally relative to the column portion, and a different toothed structure in contact with the arc-shaped toothed structure. The chair is also configured such that when a weight is applied to the seat portion, a fulcrum point of the leaf spring moves as the different toothed structure moves along the arc-shaped toothed structure to thereby shorten a working length of the leaf spring and provide an increased resistance to tilting of the backrest portion relative to the column portion. A process for assembling the chair and a weight-based tilt-resistance assembly for use with the chair are also described herein.

A chair includes a base and a back coupled to the base. The back includes a pair of back supports extending from the base and a back panel coupled to the pair of back supports. Each back support is configured to exhibit a first bending stiffness when bent to a first stop point, and exhibit a second bending stiffness when bent beyond the first stop point, the second bending stiffness being greater than the first bending stiffness.

A seating arrangement includes a support shell including a seat portion and a chair back portion each configured to support a seated user, the chair seat portion having a front region and a rear region and the chair back portion having an upper region and a lower region, where the rear region of the seat portion is coupled to the lower region of the chair back portion, a control member including a substantially flexible front support and an attachment point, where the front support engages the support shell in the front region of the seat portion and the control member engages the back portion, and a substantially rigid second support attached to the control member at the attachment point, wherein the control member is an integral, one-piece component including multiple flex regions configured to allow the support shell to move between an upright and reclined position.

A chair is provided including a subframe, a seat element, a back element, a spring mechanism and an adjustment device. The spring mechanism includes a leaf spring, which is clamped on one side in the subframe, and a support, which is movable on a track between the leaf spring and the subframe. The adjustment device includes an adjustment member and a transmission mechanism. A movement of the adjustment member is translated into a movement of the support at a transmission ratio in a range of 1:0.5 and 1:4.

A seating assembly includes a seat and an upright coupled with the seat. A pliable backrest is coupled with the upright and includes a support face and a coupling face. The pliable backrest includes a pliable material extending between the support and coupling faces. The support face is a first exterior face of the pliable back rest and the coupling face is a second exterior face of the pliable back rest. The coupling face is spaced away from the upright with a deformation gap. Another seating assembly includes a joint assembly along the upright member. The joint assembly includes a pivot configured to promote rotation of a first upright portion of the upright relative to a second upright portion. The joint assembly includes opposed stop interfaces configured to control rotation of the first upright portion relative to the second upright portion.