Abstract: A lumbar supporting device for a vehicle, may include an actuator, a lumbar plate slidably mounted to a seat back frame of the vehicle, and having a lumbar support part, wherein the lumbar support part is formed between upper and lower ends of the lumbar plate, and a driving unit coupled to the actuator and pulling both upper and lower portions of the lumbar plate together towards the lumbar support part, using power transmitted from the actuator.

Abstract: A child positioning insert including a frame with a first column and a second column, where the first and second columns are positioned vertically. The first column has a first guide and the second column has a second guide, where the first and second guides extend along a portion of the length of each column. A shoulder roll connects to the frame via the first column and the second column, so that the shoulder roll is perpendicular to the first column and the second column. The shoulder roll has a backing that connects to the first guide and to the second guide such that the backing can move vertically along the first and second guides. A head support member connects to the frame in a position above the frame and above the shoulder roll, so that the head support member includes a first support member to substantially prevent lateral motion of a person's head in a first direction and a second support member to substantially prevent lateral motion of the person's head in a second direction.

Abstract: A lumbar support for a chair includes a member having a first portion separated from a second portion via a slit formed in the member and a slider mechanism. The slider mechanism has a slider that is moveable from a first position to a second position. The first and second portions of the member are attached to each other when the slider is at the second position via the slider. The first and second portions of the member are unattached at the second position when the slider is moved from the second position to the first position.

Abstract: The technical result of the claimed utility model consists in the maintenance and retention of the natural physiological curvatures of a person's spine while said person remains in the chair. The technical result is achieved in a vehicle chair that comprises a seat having a backrest and headrest, the backrest being provided with a pad capable of moving vertically and horizontally at the level of the lumbar part of the person's spine, the headrest being capable of varying its vertical position and its angle of inclination to the horizontal and being provided with a pad in the area of the neck part of the headrest, said headrest pad being movable vertically; the backrest being capable of varying its angle of inclination to the horizontal; and the pads having a constant or variable volume.

Abstract: A resilient lower-back supporting device capable of vertical adjustment along with a backrest of a chair includes a resilient supporting unit pivotally connected between a lower end of the height-adjustable backrest and a supporting element. Configured for resilient extension and retraction, the resilient supporting unit includes an outer supporting rod and an inner supporting rod inserted therein. The two supporting rods are pulled toward each other by a spring provided therebetween. Besides, a spring is provided at an outer end of each supporting rod to bias the resilient supporting unit and the backrest toward a predetermined direction. With the backrest being vertically adjustable, and with the resilient support provided by a lower-back supporting portion at the lower end of the backrest, people of different heights are ergonomically supported especially on the lower back while sitting in the chair and are protected from back pain attributable to a prolonged sitting posture.

Abstract: An upholstered recliner chair includes a base, a seat unit disposed on the base, a backrest frame pivotably mounted on the base and hingedly mounted to the seat unit to be displaceable between upright and tilted positions, a sidewise fixed lever extending radially from the backrest frame to be movable with the backrest frame, a backrest padding disposed to be slidable relative to the backrest frame in a lengthwise direction, and a pulling unit coupled to the backrest padding, the backrest frame, the sidewise fixed lever, and the seat unit such that the backrest padding is moved with the sidewise fixed lever during displacement of the backrest frame between the upright and tilted position to thereby vary a distance between the backrest padding and the seat unit.

Abstract: Lumbar support for a seat backrest, comprising a support basket (10) extending in the longitudinal direction of the seat backrest, a frame (12) to which the support basket (10) is mounted and an adjustment device (11) which changes the position of the support basket relative to the frame, the adjustment device including a plurality of adjustment members (60) some of which are movable with respect to one another.

Abstract: The present invention relates to a chair having an adjustable backrest for spinal protection in that an inside of a backrest structure is provided with an auxiliary backrest for protecting a lumbar vertebrae, and a rack and pinion structure is employed in the backrest and the auxiliary backrest in such a manner that the backrest slides vertically and the auxiliary backrest also slides vertically by the same ratio such that the backrest and the auxiliary backrest can be adjusted appropriately and used flexibly to match the sitting height of the person sitting on the seat, thereby making it possible to provide effective protection to the spinal joints of the waist, back and neck of the user.

Abstract: A lumbar support for a vehicle backrest has a resting element with a front surface shaped for supporting an area of the back of a user; the resting element is connected to a frame of the backrest via elastic elements, which are bistable for allowing the resting element to click from an advanced position to a rearward position when a thrust against the front surface exceeds a given threshold.

Abstract: A multi-way adjustment device, in particular a two-way adjustment device, is proposed for a seat component, which is suitable in particular for the seat-back width adjustment of a seat. The multi-way adjustment device comprises an adjustment part (7) adjustably mounted relative to a mounting plate a (1), which when moved in a first adjustment direction (A) requires less energy expenditure than when moved in a second adjustment direction (B). In order to compensate this, there are provided mechanical energy accumulation means (5), which takes up mechanical energy when the movement is in the first adjustment direction (A), in order to release this when the movement is in the second adjustment direction (B) and thus to assist the movement of the adjustment part (7) in the second adjustment direction (B).

Abstract: A backrest structure for a motor vehicle seat includes a rest frame forming the supporting structure of the backrest. The rest frame includes at least two longitudinal struts running in the longitudinal direction of the backrest. The backrest structure also includes a lumbar support arranged on the front side of the rest frame for supporting the back region of a motor vehicle occupant. The lumbar support includes a transverse traverse being adjustable along the longitudinal struts with a height adjusting device, to which a support device is hinged and is adjustable with a depth adjusting device substantially perpendicular to the transverse traverse. The lumbar support further includes a retaining device supporting the transverse traverse and extending substantially in the longitudinal direction of the backrest and receiving the height adjusting device.

Abstract: A spindle drive for a lumbar support in a backrest structure of a motor vehicle seat includes two gliders guided on a carrier of the lumbar support. Each glider is connected to a spindle nut which is engaged with an associated thread section of a spindle. The thread sections have threads of opposite thread pitch, so that the gliders are movable in opposite directions and pivot towards and away from the carrier supporting bails of a supporting device hinged to the carrier and being adjustable substantially perpendicular to the carrier. At least one of the spindle nuts partly encompasses the spindle and can be clipped onto its associated thread section of the spindle.

Abstract: A resilient lower-back supporting device capable of vertical adjustment along with a backrest of a chair includes a resilient supporting unit pivotally connected between a lower end of the height-adjustable backrest and a supporting element. Configured for resilient extension and retraction, the resilient supporting unit includes an outer supporting rod and an inner supporting rod inserted therein. The two supporting rods are pulled toward each other by a spring provided therebetween. Besides, a spring is provided at an outer end of each supporting rod to bias the resilient supporting unit and the backrest toward a predetermined direction. With the backrest being vertically adjustable, and with the resilient support provided by a lower-back supporting portion at the lower end of the backrest, people of different heights are ergonomically supported especially on the lower back while sitting in the chair and are protected from back pain attributable to a prolonged sitting posture.

Abstract: The present invention is a lumbar support system that retreats into the seat back when reclined, providing a constant pressure support. The lumbar support system has a lumbar support basket that can retreat into the seat back. The lumbar support basket is supported by a crossbar that is pivotably connected to opposite sides of a seat frame via a pair of connecting members. A spring is provided for biasing the connecting members to a biased position.

Abstract: A four way lumbar support for an automobile seat includes a wire array (16), a fixed frame (20), and a basculating arm. When in its extruded position, the basculating arm (50) exerts pressure on the wire array (16) thus providing lumbar support to the seat occupant at that point. A system of Bowden cables and sliding connections allows the basculating arm to slide vertically along the fixed frame so that the lumbar support may be provided at different heights within the seat.

Abstract: An occupant lumbar support system includes a flexible lumbar support member having homogenously connected first and second connection braces. The lumbar support member is deflectable to a plurality of lumbar support positions. A rigid displacement rod is connected at a first rod end to one of the connection braces. A lumbar member actuation mechanism has a rotatable first actuation arm receiving a second displacement rod end. The actuation member translates the displacement rod causing the first and second connection braces to move toward each other, deflecting the lumbar support member to any of the lumbar support positions. A cable is connected at a first end to an actuation mechanism second actuation arm and at a second end to a displaceable lever manually movable to co-rotate the first and second actuation arms and translate the displacement rod.

Abstract: A seat including a plurality of user support assemblies that are independently adjustable. User support assemblies, which are independently adjustable, include a head support assembly, a thoracic support assembly, and a lumbar support assembly. Moreover, the seat might include a independently adjustable seat assembly.

Abstract: In a vehicular seat 10 according to this invention, since a back shell 32 covers a back frame 31, as in the case where the shape of a seat back is formed of the urethane pad, the shape of the seat back is not easily changed. Thus, the passenger can be surely held. Further, since the back shell 32 is displaceably supported for the back frame 31, the back shell 32 is displaced according to the figure or posture of the passenger. This permits the passenger to sit with good riding comfort.

Abstract: A lower-back supporting structure for a bed or a chair includes a sliding base, two scissor lifts, a driver and a supporting member. The sliding base has a pair of slide slots and a pair of rotating pins, a securing portion between the two rotating pins, and a plurality of the locking apertures. Two scissor lifts both have an X-shaped frame having a pivot. A driver has a positioning end, an extendable rod, a through hole and a sliding rod placed through the slide slot, the through hole and the first front cotter holes. A supporting member has a pair of slide tracks and a pair of rotating holes. The driver drives the sliding rod along the slide slot of the sliding base to shorten the extendable rod, the scissor lifts rotate around the pivots to lift such that the supporting member is pushed away from the sliding base.

Abstract: A chair includes a lower back frame, a back construction, including a back support attached to the lower back frame, a cushion assembly attached to the back support, and a vertically adjustable lumbar frame positioned between the back support and the cushion assembly. The lumbar frame includes a transition shell and a vertically sliding lumbar device having a plurality of horizontal flexible wires. A lower edge of the transition shell is positioned on top of an uppermost horizontal flexible wire of the lumbar device. The lumbar device is operably slidably mounted between the outer shell and cushion assembly and the transition shell upper edge slides between the outer shell and the upholstery cushion assembly. Also disclosed is a chair including a Y-shaped lower back frame having two uprights and a cross-piece attached to the back support. The uprights and cross-piece of the lower back frame include an overlap flange and the back support includes a channel-shaped flange having detents.

Abstract: A tiltable chair including a base, a fulcrum member having a curved support surface, a back support pivotally connected to the base at a pivot axis and pivotable between at least an upright position and a rearward tilt position, and at least one leaf spring having first and second ends, with the first end being restrained by the base. The at least one leaf spring engages the curved support surface of the fulcrum member at a first contact point when the back support is in the upright position and at a second contact point when the back support is in the rearward tilt position, wherein the second contact point is positioned rearwardly on the at least one leaf spring relative to the first contact point. A link member is pivotally connected to the back support at a first pivot location and is pivotally connected to the at least one leaf spring at a second pivot location. The link member defines a vector between the first and second pivot locations and the first pivot location and the pivot axis define a plane.

Abstract: A support assembly having a first support region with adjustable degree of support and a second support region with adjustable degree of support for use in a seat structure is provided. The support assembly comprises a support member for incorporation into a seat frame, a first adjustment arrangement for adjusting the degree of support in the first support region, and a second adjustment arrangement for adjusting the degree of support in the second support region. The support assembly further comprises an actuator coupled to the first adjustment arrangement and to the second adjustment arrangement), the actuator being configured to simultaneously act on the first adjustment arrangement and on the second adjustment arrangement in opposite directions.

Abstract: A seat assembly includes a seat defining an outer seating surface. An adjustment mechanism is mounted on the seat and includes a member movable relative to the seating surface for altering the contoured shape of the seating surface. A sensor is mounted on the seat. The sensor detects the location of an applied force acting on the seating surface by an occupant seated on the seat back and detects an applied pressure distribution of the force exerted on the seating surface. The sensor supplies a signal indicative of the location of the applied force and the applied pressure distribution of the force. A controller receives the signal and is operable by a seat occupant for storing information corresponding to the location of the applied force and the applied pressure distribution of the force.

Abstract: An actuator assembly for adjusting first and second comfort features of a seat assembly includes a housing and a shaft mounted for linear and rotational movement in the housing. A main gear is mounted on the shaft and mounted for rotational movement in the housing. The shaft and main gear are linearly movable between first and second positions relative to the housing. A first cable assembly includes a first pinion gear mounted for rotational movement in the housing. A first rack is mounted for linear movement in the housing. The first rack engages with the first pinion gear such that rotation of the first pinion gear linearly moves the first rack. A first cable is connected to the first rack. The first cable is adapted to be connected to a first comfort feature. A second cable assembly includes a second pinion gear mounted for rotational movement in the housing. A second rack is mounted for linear movement in the housing.

Abstract: In order to secure a shape retaining property of a support face of a backrest 1 of a chair, the backrest 1 for chairs comprises frame elements 21 and 22 arranged in pairs at right and left sides, a flexible support member 3 that bridges the frame elements 21 and 22 to support a load of a body of a seated person and an adjust mechanism that can change a bent degree of the support member 3 in multiple states and that can maintain the state against the load of the seated person.

Abstract: An occupant lumbar support system includes a flexible lumbar support member having homogenously connected first and second connection braces. The lumbar support member is deflectable to a plurality of lumbar support positions. A rigid displacement rod is connected at a first rod end to one of the connection braces. A lumbar member actuation mechanism has a rotatable first actuation arm receiving a second displacement rod end. The actuation member translates the displacement rod causing the first and second connection braces to move toward each other, deflecting the lumbar support member to any of the lumbar support positions. A cable is connected at a first end to an actuation mechanism second actuation arm and at a second end to a displaceable lever manually movable to co-rotate the first and second actuation arms and translate the displacement rod.

Abstract: A chair includes a base having a control assembly operably supporting a seat assembly and also a back assembly for movement about a seat tilt axis and a back tilt axis, respectively. The back assembly includes a flexible sheet supported at upper/outer corners by a back support structure and hanging downwardly. The flexible sheet includes a lower portion coupled to the back support structure by a tensioner for holding the lower portion rearwardly. A vertically-adjustable lumbar mechanism is adjustably supported on the back support structure and operably engages the flexible sheet for flexing a lumbar area of the flexible sheet forwardly to provide an optimal ergonomic horizontal and vertical convex shape for postural lumbar support.

Abstract: An actuator assembly for adjusting first and second comfort features of a seat assembly includes a housing and a shaft mounted for linear and rotational movement in the housing. A main gear is mounted on the shaft and mounted for rotational movement in the housing. The shaft and main gear are linearly movable between first and second positions relative to the housing. A first cable assembly includes a first pinion gear mounted for rotational movement in the housing. A first rack is mounted for linear movement in the housing. The first rack engages with the first pinion gear such that rotation of the first pinion gear linearly moves the first rack. A first cable is connected to the first rack. The first cable is adapted to be connected to a first comfort feature. A second cable assembly includes a second pinion gear mounted for rotational movement in the housing. A second rack is mounted for linear movement in the housing.

Abstract: A backrest structure for a motor vehicle seat is provided. The backrest structure having a rest frame forming the supporting structure of the backrest, which rest frame comprises at least two longitudinal struts running in the longitudinal direction of the rest, a lumbar support arranged on the front side of the rest frame for supporting the back region of a motor vehicle occupant having a transverse traverse being adjustable along the longitudinal struts by means of a height adjusting device, to which a support device is hinged and is adjustable by means of a depth adjusting device substantially perpendicular to the transverse traverse. A retaining device supporting the transverse traverse and extending substantially in the longitudinal direction of the rest and receiving the height adjusting device.

Abstract: An active headrest assembly for a vehicle includes a headrest supported by a seat back frame. An active plate is connected to the headrest and has guide slots defined therein. Guide pins are inserted through the guide slots to slide along the guide slots. A lumbar unit has a support wire secured to the guide pins and is rotatably connected to the lower end of the seat back frame. A returning unit elastically connects the active plate and the lumbar unit with each other.

Abstract: A traction table (200) include a frame having a base-frame portion (202) rotabably coupled to a top-frame portion (250) at a pivot point 214, a seat back portion (208) coupled to the top frame portion, and a seat-bottom (204) slidably coupled to the frame top portion. The seat-bottom can rotate about a pivot point (262) and tilt about at least one axis (260 and/or 264). The seat-bottom can further slide forwards or backwards relative to the top frame portion. The traction table can include an optional neck piece (210) coupled to the top frame portion that can move parallel relative to the seat back portion and constructed to rotate, tilt side to side or forward and backward. The traction table can include at least one actuator motor (245 or 244) for moving the seat-bottom or neck piece relative to the top-frame portion and a controller (212) for controlling such actuator(s).

Abstract: An insert for protecting the breathing airway of an infant conforms to the incline angle of an infant seat, such as a car seat, high chair, stroller, or jogger. Preferably the insert is hinged so it can be used in an infant seat or laid flat for use on a changing table or other flat surface. In use, two side rolls contact the infant to prevent it from moving sideways. A bottom roll prevents slouching in the seat and supports the infant's legs when laid flat. Preferably, the bottom roll is removable so the insert may be used with larger infants who do not need the provided support. An adjustable shoulder roll extends between the side rolls and can be moved up or down for proper placement behind the infant's shoulders. The shoulder roll compensates for the infant's rearward-elongated head, keeping it in a natural position to avoid compromising the airway. The rolls are preferably made of memory foam and covered by machine-washable fabric.

Abstract: A seat back structure includes a back frame and a flexible sheet-like member. The back frame formed into a frame-like skeleton of a seat has a fixing portion. The flexible sheet-like member is provided within the back frame so as to support a back portion of a passenger. The flexible sheet-like member comprises a first supporting portion that is engaged with the fixing portion to regulate a substantial backward movement of the first supporting portion over a predetermined distance. The first supporting portion is slidable in substantially upper and lower directions with respect to the fixing portion.

Abstract: The invention is a lumbar support basket with a sliding support structure which provides curvature and vertical travel of the apex of curvature. The basket is provided with an open area at the top half or third for receiving duct work.

Abstract: The invention to a seat, in particular an aircraft passenger seat, comprising seat components such as a seat (10) and a backrest (12), in addition to at least one cover part (20), which is pre-tensioned in at least one direction and at least one section and which extends between frame parts (24) of an allocated seat component. As the seat is provided with at least one controllable adjusting unit (26), which permits the specification of different pre-tensions for the respective cover part (20) within a predefinable range and in a reversible manner, the respective seat user, who occupies the seat can adapt the seat to his or her comfort and health requirements.

Abstract: To adjust a component (17) of a seat (14), and particularly a seat (14) in a motor vehicle, use is made of an adjusting device (28, 29) which has a rotary drive (8) and a gearbox. The gearbox comprises a planetary gear train having a sunwheel (7) driven by the rotary drive (8), at least one planetary gear (4) mounted to rotate on a planetary gear carrier (6) and a fixed annular gear (1). The at least one planetary gear (4) meshes with the sunwheel (7) and the annular gear (1). The output of the gearbox is taken from the planetary gear carrier (6), which takes the particular form of a cable drum so that the adjustment of the component of the seat can be performed by means of a traction cable secured to the cable drum which can be wound up thereon. With the help of a gearbox of this form it is possible to achieve a particularly small size, which substantially simplifies the fitting of the adjusting device (28, 29) into a seat (14).

Abstract: An apparatus for sitting, including: a keystone assembly which connects various parts of the apparatus; a back that provides support for at least a person's back or shoulders; a floating lumbar support, which provides support for a person's lower back, attached to the keystone assembly; a seat that can adjust between a forward tilted and reclined position; a plurality of rollers, disposed on the keystone assembly, on which the seat rests; a central column, attached to the keystone assembly, on which the seat can spin; and a lower torsion spring connected to the seat and disposed on the keystone assembly allowing controlled movement of the seat.

Abstract: An adjustable ergonomic back for a seat is disclosed. The back has a plurality of back cushions, each cushion having at least one adjustment area. It further comprises a structural shell having a plurality of voids therein. A plurality of thin flexible elements are located between the back cushions and the structural shell, each flexible element being attached to the structural shell. Each of the flexible elements has a front surface and a back surface, the front surface being in contact with a respective adjustment area of one of the plurality of back cushions. The back further has a plurality of actuators located between the flexible elements and the structural shell, each of the actuators being in contact with one of the respective back surfaces of the flexible elements and exerting a pressure on the back surface.

Abstract: A a lumbar support has a flexible seat suspension and a supporting mechanism. The lumbar support device is capable of providing an infinite number of vertical adjustment points. The supporting mechanism is connected to the flexible seat suspension by slide elements and travels up and down the side rails of the flexible seat suspension to the seat occupant's desired position. The movement of the supporting mechanism is accomplished both vertically along the flexible seat suspersion and horizonally relative to the seat by using wire cables, tractions cables, and a series of pulleys. The pulley system reduces the load of the actuators used in the lumbar device making it possible to use smaller, less expensive actuators.

Abstract: Ergonomic systems and devices are disclosed. In accordance with the embodiments of the invention, a system or device includes a traction surface that provides traction and/or support through contact with a portion of a user's body. For example, an ergonomic system includes a backrest cushion. The backrest cushion has a traction surface with a plurality of protruding traction pads for resting against a user's back and pulling along the user's back. The traction pads help stretch or decompress the user's spine through contact at multiple positions on the back and flanking the spine. In alternative embodiments of the invention, a chair, resting table, bed or other article of furniture includes one or more traction surfaces that provide traction through contact with one or more corresponding portions of a user's body.

Abstract: A motor vehicle seat back structure comprising a backrest support frame which consists of a surface turned towards the seat user's back, a lordosis support which is arranged on the front part of the backrest support frame for supporting the user's back and an adjusting device for vertically adjusting the lordosis support position with respect to the extension plane of said backrest support frame. The adjusting device comprises at least one adjusting element operably connected to the lordosis support and at least one sliding element which is displaceable with respect to said adjusting element and interacts therewith in such a way that when the sliding element moves, the adjusting element is displaced with a directional component perpendicularly to the displacement direction of the sliding element and performs an action on said lordosis support in the direction.

Abstract: A piece of seating furniture, in particular an office chair, has a backrest with a lumbar support. In order to improve the comfort and ease of use of such a piece of seating furniture, the lumbar support is disposed in a height-adjustable manner on a flexible guide strip.

Abstract: A combination lumbar bolster system for attachment to a vehicle seat frame comprises a lumbar support having a flat position and a deployed position, wherein the deployed position is forward of the flat position; a pair of lateral bolsters each having a resting position and an extended position, wherein the extended position is further from the seat frame than the resting position; at least one traction cable operably attached to at least one of the lumbar support and the lateral bolsters; and at least one spring. The traction cable moves the lumbar support between the flat position and the deployed position and the lateral bolsters between the resting positions and the extended positions such that the movements of the lumbar support and the bolsters is coordinated, and the spring opposes the movement of the traction cable.

Abstract: A seat device for a chair having a lumbar support or a seatback is provided. A lower portion of the lumbar support (or seatback) is formed as a shaft having an external teeth portion for positioning pin lugs of a base and fixed blocks. A movable block is joined with one of the fixed blocks. An elastic member is positioned between inner holes of the external teeth portion and an internal teeth portion of the movable block. The fixed blocks are secured by outer covers. A lifter is pivoted to the outer cover secured with the movable block. The lumbar support (or seatback) is separated into a plate including a ladder-type groove and sliders and a pad jointed with a board on the back having a latch member and sliding grooves. A pull bar extends from the board. The angle and height adjustable lumbar support (or seatback) is therefore achieved.

Abstract: The chair has a sub frame (1) set on the floor, a mechanism (2) set on the sub frame, a seat (3) set on the mechanism (2) and a backrest (7) attached to the mechanism (2). The backrest (7) exhibits a backrest frame (5), which supports an elastically deformable backrest part (6) with a back panel (62). The back panel (62) has a back part (60), to which a head restraint (61) is attached. The backrest (7) is capable of pivoting about a first pivot shaft (D1) from an essentially upright, neutral position to a reclined position displaced towards the rear. The movements of the seat (3) and the backrest (7) are synchronized with one another.

Abstract: A thoracic back support allows for and assists in the promotion of scapular retraction in a seated human. In various examples, such supports may be rigid or semi-rigid, and they may be convex.

Abstract: An adjustable lumbar support for a chair back having a frame with a top end and a bottom end. The frame has a series of flexing zones and a series of control zones. The adjustable lumbar support for a chair back further includes a support having a first end and a second end. The first end of the support is adapted to engage the top end of the frame. The lumbar support also includes an adjusting means adapted to adjust the support in a vertical plane for flexing of the frame and the chair back in a horizontal plane. The adjusting means is also adapted to engage the second end of the support and adapted to engage the bottom end of the frame. The frame is mounted to the chair back.

Abstract: The present invention relates to a device for lumbar support (2) for an office chair with a backrest consisting of a backrest frame with a membrane stretched over it, wherein the device (2) is mounted independently of the membrane in the backrest frame and is adjustable in height as well as horizontally extendable.

Abstract: An ergonomic chair including a seat support structure with a seat bottom and seat back supported by the seat support structure. The seat bottom is shortened to accommodate the buttocks and ischia, with no weight-bearing on the thighs. The seat back has an upper portion which protrudes forward greater than the lower portion with a sudden transition to provide an innate lumbar support.

Abstract: An adjustable lumbar support for a seat comprising a pair of parallel lateral rails, wherein each of the lateral rails has a lower end and an upper end, a support panel having a top end and a bottom end, the support panel pivoting at the top end while remaining fixed with respect to the lateral rails, a rail bracket slidably attached to the lateral rails, a spring operatively connected to the rail bracket, wherein the spring biases the rail bracket in a first position, a cable operatively connected to the rail bracket, wherein the cable pulls the bracket from the first position to a second position, and a lift wire pivotably attaching the support panel to the rail bracket.