A home or office chair is disclosed having a flexible mesh back rest and a full lumbar back support including upper and lower lumbar supports that are located one above the other at the back of the chair to press against the outside of the mesh back rest. The upper and lower lumbar supports are connected to the back of the chair by a bolt so as to move back and forth in first and opposite directions in response to a user seated in the chair moving his back against and away from the flexible mesh back rest. The upper and lower lumbar supports of the full lumbar back support apply continuous pressure through the mesh back rest to provide support for upper and lower lumbar areas of the user's back regardless of whether the user's back is at rest or pressing against the mesh back rest.

A chair that provides movement side-to-side about a first pivot axis positioned above the seat plane allows the user a wide range of dynamic movement, but does not require constant or excessive action on the part of the user to maintain a desired position. In addition and concurrently thereto, the chair may include structures that allow the seat to be easily positioned and adjusted side-to-side from a neutral position along a defined pivot axis above a seat plane, and it may, if desired, also provide forward-and-back movement of the seat about a second pivot located above or below the seat plane, an improved seatback that supports the user's back without limiting the user's ability to move their shoulder blades, an improved biasing structure for biasing the seat to a neutral position, an imbedded controller or imbedded sensor for allowing the seat's position to be used as a computer controller, or the gathering of the users motion data, and an adjustable tilt locking system to allow the forward-and-back movement of the seat to be held in a desired position.

A home or office chair is disclosed having a flexible mesh back rest and a full lumbar back support including upper and lower lumbar supports that are located one above the other at the back of the chair to press against the outside of the mesh back rest. The upper and lower lumbar supports are connected to the back of the chair by a bolt so as to move back and forth in first and opposite directions in response to a user seated in the chair moving his back against and away from the flexible mesh back rest. The upper and lower lumbar supports of the full lumbar back support apply continuous pressure through the mesh back rest to provide support for upper and lower lumbar areas of the user's back regardless of whether the user's back is at rest or pressing against the mesh back rest.

This invention is a backrest adjusting mechanism and a chair using the same and relates to the technical field of chairs. The backrest adjusting mechanism has a backrest, and the backrest is movably arranged above a support surface of a chair body, and a distance between the backrest and a backrest support plate of the chair body is adjustable; the backrest is provided with a connecting base on a side close to the backrest support plate of the chair body. The backrest adjusting mechanism has at least one set of sliding assembly, wherein the sliding assembly is configured to connect the connecting base and the backrest support plate of the chair body.

A reconfigurable apparatus for sitting and having a seat mounted on a frame and movable under the weight of a sitting user. As an incident of the user sitting, resistance to movement of a back rest component is increased a predetermined amount based upon the user's weight. A manually operable subassembly allows the increased resistance to be changed from the predetermined amount with the user sitting on the seat.

A seat tilting mechanism comprising a main body, a support member rotationally mounted to said main body, and a first extension coil spring mounted between said main body and said support member to provide resistance to rotation of said support member, in which said seat tilting mechanism further comprises a second extension coil spring and an engagement mechanism which engages said second extension coil spring for resistance to rotation of said support member when said first extension coil spring reaches a pre-determined point of extension.

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 support mechanism for mounting a seat part to a foot part of a functional chair having a slide bearing which cooperates with a front section of the seat part, and a pivotable support part which is supported by a cantilever part and which is connected to a region of the seat part that is adjacent to the rear region of a seat surface section of the seat part.

A structure for chair backrest is disclosed. The chair includes a first support frame, a second support frame coupled to the first support frame, a seat section arranged between the first support frame and the second support frame. The first support frame includes a backrest mounted thereon. The first support frame includes a lower frame section and an upper frame section. The lower frame section and the upper frame section include, mounted therebetween, a supine inclination assembly that upon receiving a force acting thereon takes a movement for achieving an predetermined angle of supine inclination. In this way, easy adjustment of the angular position of the backrest may be achieved for comfortableness of the user, and excessive inclination that causes potential risk can be avoided so as to improve the utilization of the backrest of the chair.

The present invention is about a chair back adjusting mechanism, and relates to the technical field of chairs. The chair back adjusting mechanism includes a chair back, which is movably disposed above a supporting surface of a chair seat and is provided with a connecting base at a side close to a fixed bracket, and the chair back is movably connected to the connecting base; the connecting base is provided with a first sleeve pipe at a side close to the fixed bracket, the fixed bracket is provided with a second sleeve pipe at a side close to the connecting base. The chair back is connected to a chair body by a sliding and elastic telescopic assembly, which reduces the user's feeling of fatigue and effectively relieves fatigue at the waist of sedentary people; and the chair back adjusting mechanism has a simple structure, which reduces the manufacturing cost.