Disclosed is a lumbar supporting system of a chair and a chair having the same, and an object to be achieved by the present disclosure is to provide a lumbar supporting system of a chair and a chair having the same, which are capable of accurately supporting a user's waist according to the user's body type by adjusting a height and depth of a lumbar pad by using a vertical operating force.

A back support for a chair includes a cover configured to be coupled to opposing sides of a chair frame. A strap is connected to the cover. A sled having a central portion is coupled to the strap, the sled is configured to pivot with respect to the chair frame and provide support to a user's back. The cover is configured to moveably connect to the chair frame between a low position and a high position. The sled is configured to pivot as the cover moves between the low position and the high position so that the central portion of the sled is substantially parallel to at least a portion of a membrane connected to the frame between the low position and the high position.

A seating arrangement includes a back frame that includes a top portion, a bottom portion, and a pair of side portions that cooperate to define an opening, wherein at least one of the top portion, the bottom portion and the side portions include a longitudinally extending channel, a back shell having a forwardly facing support surface located within the opening and configured to support a seated user, and an attachment portion that extends about at least a portion of a periphery the support surface, and a cover member extending over the support surface, wherein the cover member is directly attached to the attachment portion of the back shell at an attachment location, and wherein the attachment location and the attachment portion of the back shell are located within the channel and concealed from view.

A chair having an articulating backrest that deforms when reclined to support an occupant's head or shoulders. A backrest assembly includes a mesh insert secured to a frame, which includes an upper frame section and a lower frame section interconnected by a pair of articulated joints. A push arm pivotally connects to the chair's seat assembly and to the backrest's upper frame section. As the chair reclines, the push arm restricts the angular movement of the upper frame section relative to a floor. The lower frame section moves forward relative to the upper frame section. Consequently, an angle formed between the lower frame section and the upper frame section decreases during recline, thereby supporting the chair occupant's head or shoulders. Optionally, a tensioning member may connect the mesh insert to the push arm to offset any loss of tension caused by the deformation of the frame during reclined.

A chair assembly includes a base assembly, a seat assembly having a pair of side edges and a fore-to-aft extending longitudinal centerline, a back assembly movable between upright and reclined positions, and an arm assembly including an arm base extending from a first location between the side edges to a second location laterally outward of one of the side edges, wherein the arm base extends at an acute angle with respect to the longitudinal centerline and at an upward angle from the first location toward the second location, a support assembly supported by and extending upwardly from the arm base, and an armrest supported by the support assembly that is adjustable to support the armrest between a plurality of selected vertical positions, wherein the arm assembly and back assembly move at a different rate from one another as the back assembly is moved between the upright and reclined positions.

Disclosed is a waist support structure of a seat back. The seat back includes a first frame, a second frame coupled to the first frame, and a net member mounted between the first and second frames. The second frame includes a mounting brace mounted thereto and the mounting brace include a waist support coupling section that is connectable with a waist support. The waist support includes a support portion including a rigid plate and a connection portion. The support portion includes a barrel mounted thereto and extending toward the connection portion. The connection portion includes a projection peg mounted thereto and extending toward the support portion to correspond to the barrel. An elastic element has an end fit to the projection peg of the connection portion and an opposite end fit in the barrel of the support portion so as to interface between the connection portion and the support portion.

A furniture assembly may include a seat bottom, a seatback, and a lumbar adjustment assembly. The seatback is disposed adjacent the seat bottom and includes a seatback frame. The lumbar adjustment assembly may be mounted to the seatback frame and may include a rail, a threaded rod disposed within the rail, a first slider block slidably engaging the rail, a second slider block slidably engaging the rail, a lumbar pad, and links connecting the lumbar pad to the first and second slider blocks. The threaded rod may include a first threaded section having threads with a first handedness and a second threaded section having threads with a second handedness that is opposite the first handedness. The first slider block may threadably engage the first threaded section. The second slider block may threadably engage the second threaded section. One or more massaging units may be mounted to the lumbar pad.

A chair back assembly includes a back shell member including laterally extending top, bottom and side portions cooperating to define an open space therebetween, where a portion of the back shell member is located in a lumbar region, a cover having a first surface and a second surface opposite the first surface, wherein the cover covers at least a portion of the open space, and a back frame assembly operably supporting the back shell member and movable between upright and reclined positions, wherein the back frame assembly causes the back shell to flex in a fore-to-aft direction as the back frame assembly is moved between the upright and reclined positions independent of an external force being exerted on the back shell member, and where the lumbar portion of the back shell member remains spaced from the back frame as the back frame is moved between the upright and reclined positions.

A chair includes a frame unit including a seat frame, a leg rest that is pivotally mounted to the seat frame, and a rest adjusting mechanism that is connected between the leg rest and the seat frame. The rest adjusting mechanism is convertible between an unlocked state, where the leg rest is permitted to pivot relative to the seat frame, and a locked state, where the leg rest is not permitted to pivot relative to the seat frame.

A backrest includes a primary frame having a pair of laterally spaced first uprights defining a first opening therebetween, a first front surface and a first rear surface. A secondary frame includes a pair of laterally spaced second uprights defining a second opening therebetween, a second rear surface facing the first front surface of the primary frame and a second front surface, wherein the secondary frame is coupled to the primary frame, and wherein at least portions of the first and second openings are aligned. A flexible shell overlies and is coupled to the second front surface of the secondary frame. The flexible shell includes a third rear surface visible through the aligned portions of the first and second openings.