Abstract: A chair includes a control housing, a seat and a back support including an upwardly extending upright portion and a link portion extending forwardly from a lower portion of the upright portion. The link portion is pivotally connected to the control housing about a first pivot axis. The seat is connected to the link portion and is pivotable relative thereto. A linkage is coupled to the seat and is pivotally connected to the control housing at a second pivot axis positioned rearwardly and downwardly from the first pivot axis.

Abstract: A chair includes a control housing, a seat and a back support including an upwardly extending upright portion and a link portion extending forwardly from a lower portion of the upright portion. The link portion is pivotally connected to the control housing about a first pivot axis. The seat is connected to the link portion and is pivotable relative thereto. A linkage is coupled to the seat and is pivotally connected to the control housing at a second pivot axis positioned rearwardly and downwardly from the first pivot axis.

Abstract: A chair includes a control housing, a seat and a back support including an upwardly extending upright portion and a link portion extending forwardly from a lower portion of the upright portion. The link portion is pivotally connected to the control housing about a first pivot axis. The seat is connected to the link portion and is pivotable relative thereto. A linkage is coupled to the seat and is pivotally connected to the control housing at a second pivot axis positioned rearwardly and downwardly from the first pivot axis.

Abstract: A seating structure includes a backrest having a top and bottom and includes a frame. The frame includes a pair of spaced apart side members defining an opening therebetween. Each of the side members has a length. A flexible membrane extends between and is attached to the side members across the opening. An armrest is moveably mounted to each of the side members. Each of the armrests is adjustably moveable along at least a portion of the length of the side members between at least a first position and a second position. The first position is closer to the bottom of the backrest than the second position. A method of adjusting the seating structure is also provided.

Abstract: A seating structure having a fabric with a weave pattern for supporting the body of a user. The fabric includes a plurality of strands of multifilament yarn and a plurality of monofilaments running generally perpendicular to the strands. At least some of the monofilaments are arranged in pairs. The monofilaments in each pair weaving alternatively above and below some adjacent strands and crossing over each other between other adjacent strands.

Abstract: A seating structure includes a support structure, a seat supported by the support structure and a backrest pivotally connected to the support structure. The seat includes a front and rear. The backrest is positioned adjacent the rear of the seat. The backrest includes a frame having a pair of bow-shaped side members. Each of the side members has a lower section and an upper section. The upper sections extend from the lower sections so as to form a pair of first bowed sections at substantially a lumbar region of the backrest. A flexible membrane is attached to and extends between the side members. The flexible membrane has a second bowed section corresponding to the first bowed sections of the side members. A method of using the seating structure is also provided.

Abstract: A seating structure includes a support assembly for supporting the body of a user. The support assembly includes a frame member defining an opening and having a channel formed around at least a portion of a perimeter of the opening and an expandable carrier member expandable between at least a first and second configuration. The carrier member is inserted into the channel when expanded to the second configuration. A membrane of elastic material covers the central opening. The membrane has an edge, at least a portion of which is attached to the carrier member. The membrane is stretched a desired amount as the carrier member is expanded between the first and second configurations. A method of assembling a seating structure is also provided.

Abstract: A backrest for a chair comprising a frame, a membrane and a back support member. The membrane, at least a portion of which is transparent, is attached to the frame and has a first body-contacting surface and an opposite second surface. The back support member is attached to the frame and has a support surface. At least a portion of the support surface contacts the second surface of the membrane, and at least a portion of the back support member is visible through the membrane from the first body-contacting surface thereof. In another aspect, a backrest for a chair comprises a frame having a pair of side members, wherein each of the side members has a lower section and an upper section. The upper section extends rearwardly and outwardly from the lower section so as to form a bowed section therewith. A flexible membrane is attached to and extends between the side members, and has a bowed section corresponding to the bowed section of the side members.

Abstract: A seating structure includes a backrest having a top and bottom and includes a frame. The frame includes a pair of spaced apart side members defining an opening therebetween. Each of the side members has a length. A flexible membrane extends between and is attached to the side members across the opening. An armrest is moveably mounted to each of the side members. Each of the armrests is adjustably moveable along at least a portion of the length of the side members between at least a first position and a second position. The first position is closer to the bottom of the backrest than the second position. A method of adjusting the seating structure is also provided.

Abstract: A seating structure includes a support assembly for supporting the body of a user. The support assembly includes a frame member defining an opening and having a channel formed around at least a portion of a perimeter of the opening and an expandable carrier member expandable between at least a first and second configuration. The carrier member is inserted into the channel when expanded to the second configuration. A membrane of elastic material covers the central opening. The membrane has an edge, at least a portion of which is attached to the carrier member. The membrane is stretched a desired amount as the carrier member is expanded between the first and second configurations. A method of assembling a seating structure is also provided.

Abstract: A seating structure having a fabric with a weave pattern for supporting the body of a user. The fabric includes a plurality of strands of multifilament yarn and a plurality of monofilaments running generally perpendicular to the strands. At least some of the monofilaments are arranged in pairs. The monofilaments in each pair weaving alternatively above and below some adjacent strands and crossing over each other between other adjacent strands.

Abstract: A seating structure includes a support structure, a seat supported by the support structure and a backrest pivotally connected to the support structure. The seat includes a front and rear. The backrest is positioned adjacent the rear of the seat. The backrest includes a frame having a pair of bow-shaped side members. Each of the side members has a lower section and an upper section. The upper sections extend from the lower sections so as to form a pair of first bowed sections at substantially a lumbar region of the backrest. A flexible membrane is attached to and extends between the side members. The flexible membrane has a second bowed section corresponding to the first bowed sections of the side members. A method of using the seating structure is also provided.

Abstract: A tiltable chair including a base member (44), a seat (32), a back (34), and a linkage assembly (40) adapted to allow the seat and back to tilt downwardly and rearwardly and to allow pivotal movement of the seat about a pivot axis (52) in substantial alignment with the hip joints of a user. Other aspects of the invention are to provide a vertically adjustable column (42) for supporting the seat of the chair, a support assembly including a frame member (33) having a central opening therethrough and a receptacle formed around the perimeter thereof, a carrier member adapted to fit inside the receptacle, and a membrane of elastic material (210) covering the central opening, and a pair of armrests (36) adapted to be mounted to the chair to allow pivotal movement thereof.

Abstract: A backrest for a chair comprising a frame, a membrane and a back support member. The membrane, at least a portion of which is transparent, is attached to the frame and has a first body-contacting surface and an opposite second surface. The back support member is attached to the frame and has a support surface. At least a portion of the support surface contacts the second surface of the membrane, and at least a portion of the back support member is visible through the membrane from the first body-contacting surface thereof. In another aspect, a backrest for a chair comprises a frame having a pair of side members, wherein each of the side members has a lower section and an upper section. The upper section extends rearwardly and outwardly from the lower section so as to form a bowed section therewith. A flexible membrane is attached to and extends between the side members, and has a bowed section corresponding to the bowed section of the side members.

Abstract: A seat for a chair comprises a frame comprising spaced apart side members with inboard edges defining an opening therebetween. Each of the side members has a support wall extending upwardly from the inboard edges. A membrane extends between and is attached to the side members and covers at least a portion of the opening. At least a portion of the support walls extend upwardly from and are positioned above at least a portion of an upper body-supporting surface of the membrane. In another aspect, the seat has a frame and a flexible membrane secured to the frame, with the membrane and frame defining an upper body-supporting surface comprising substantially concave side portions and a substantially convex front portion. In yet another aspect, the seat comprises a frame comprising a front portion and a flexible membrane connected to the front portion. A cushion is disposed between the front portion of the frame and the membrane.

Abstract: A method of making an office chair by stretching a membrane in a stretching machine and retaining the stretched membrane on a loom. The loom, with the retained stretched membrane, is removed from the stretching machine and positioned between molds of a molding machine, wherein the molding machine is used to form a carrier member to hold a portion of the stretched member by injecting a material into a cavity formed between the molds to form a part of the chair.

Abstract: A support assembly for supporting the body of a user in a chair including a frame member having a channel. A prestretched membrane comprising an elastic material is attached to a carrier member, which is inserted in the channel. A method is also provided for manufacturing a chair including a frame member, a membrane and a carrier member.

Abstract: A membrane for a seating structure including a plurality of groups of at least two adjacent and parallel strands of multifilament yarn and a plurality of monofilaments arranged in generally perpendicular interlocking relationship with the strands. The monofilaments weave alternatively above and below the adjacent strands in each group. A plurality of pairs of the monofilaments hold the groups of strands in place by having the monofilaments in each pair cross over between each group of strands. In one aspect, the membrane is attached to a frame member such that the plurality of groups of strands are oriented in the longitudinal direction of the frame member and the monofilaments are oriented in the lateral warp direction of the frame member. In another aspect, the seating structure includes the frame member and attached membrane.