A seat structure comprises a base configured to be a chair base assembly; a seat support located above the base, wherein a front part of the seat support has rotary connection with the front part of the base through a transition link; a chair back assembly having rotary connection with a rear part of the base through a pivot; a lever driving member linked between the chair back assembly and the seat support, and having rotary connection with a rear part of the seat support, wherein the lever driving member and the seat support are approximately on the same surface. When the chair back assembly rotates rearward around the pivot from the initial position, the rear part of the seat support is raised diagonally to the rear through the lever driving member, meanwhile the transition link and the front part of the seat support are pulled up.

A chair having a backrest having an upper backrest section and a lumbar section, wherein the lumbar section is provided with a plurality of perforations and is elastically deformable to allow a backward tilting movement of the upper backrest section under a backward thrust applied from a user's back, and wherein the perforations stop the backward tilting movement of the upper backrest section in a position of maximum backward tilt of the upper backrest section.

A chair having a backrest having an upper backrest section and a lumbar section, wherein the lumbar section is provided with a plurality of perforations and is elastically deformable to allow a backward tilting movement of the upper backrest section under a backward thrust applied from a user's back, and wherein the perforations stop the backward tilting movement of the upper backrest section in a position of maximum backward tilt of the upper backrest section.

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.

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.

A rocking chair frame has a bottom end of a left side frame rotatably connected to a left lower frame, a bottom end of a right side frame rotatably connected to a right lower frame, and two ends of the foldable cross frame connected to the left side frame and the right side frame respectively. A left elastic device is slidably disposed on the left side frame in an up-and-down direction. A bottom end of a left supporting rod is pivotally connected to the left lower frame. A top end of the left supporting rod is connected to the left elastic device. A right elastic device is slidably disposed on the right side frame in the up-and-down direction. A bottom end of a right supporting rod is pivotally connected to the right lower frame. A top end of the right supporting rod is connected to the right elastic device.

A rocking chair frame has a bottom end of a left side frame rotatably connected to a left lower frame, a bottom end of a right side frame rotatably connected to a right lower frame, and two ends of the foldable cross frame connected to the left side frame and the right side frame respectively. A left elastic device is slidably disposed on the left side frame in an up-and-down direction. A bottom end of a left supporting rod is pivotally connected to the left lower frame. A top end of the left supporting rod is connected to the left elastic device. A right elastic device is slidably disposed on the right side frame in the up-and-down direction. A bottom end of a right supporting rod is pivotally connected to the right lower frame. A top end of the right supporting rod is connected to the right elastic device.

A recliner (1), including a reclining surface (2) and a substructure (3) that can be set on a base and supports the reclining surface (2), the substructure (3) including at least one stand (4) and at least one spring element (5) that is positioned between the stand (4) and the reclining surface (2), the reclining surface (2) being mounted on the spring element (5), the spring element (5) elastically pretensioning the reclining surface (2) in the direction (6) leading away from the stand (4), and the reclining surface (2), when unloaded, being held in an elastically pretensioned manner by a limiting element (7) of the recliner (1).

A recliner (1), including a reclining surface (2) and a substructure (3) that can be set on a base and supports the reclining surface (2), the substructure (3) including at least one stand (4) and at least one spring element (5) that is positioned between the stand (4) and the reclining surface (2), the reclining surface (2) being mounted on the spring element (5), the spring element (5) elastically pretensioning the reclining surface (2) in the direction (6) leading away from the stand (4), and the reclining surface (2), when unloaded, being held in an elastically pretensioned manner by a limiting element (7) of the recliner (1).

A spring actuated rocking mechanism can be attached to the legs of a collapsible chair to allow for the user to rock in the collapsible chair. The mechanism may be attached at the factory or retrofitted to the chair. The rocking mechanism can be attached to the end of a leg or disposed within a leg, having a leg portion above and below the mechanism.