Abstract: A chair includes a base, a seat coupled to the base, and a back coupled to the seat and/or the base. The seat includes a front portion positioned on a first side of the base, and a rear portion positioned on a second side of the base. A seat angle defined between the front portion and the base is substantially fixed between approximately 85 degrees and approximately 90 degrees. The back extends generally upward from the rear portion of the seat.

Abstract: Adjustment of snout height and tension is provided for a combine harvester. The combine harvester includes a header having a plurality of row unit divider assemblies. The row unit divider assemblies include a bonnet portion, a snout portion, and a height and tension adjustment device. The height and tension adjustment device is coupled between the bonnet portion and the snout portion and is operable to adjust an angle and tension of the snout portion with respect to the bonnet portion.

Abstract: A modular chair mechanism for limiting travel and adjusting tension in a chair is provided. The chair mechanism generally includes a shuttle that travels inside a housing, with a biasing member that applies tension during travel of the shuttle. An interface is coupled to the shuttle that alters the amount of force required to cause the shuttle to travel. In embodiments, the chair mechanism limits travel of a chair back support assembly to a number of positions based on travel of a shuttle inside the mechanism housing. For example, a feature on an end of the shuttle may selectively abut one of a plurality of retention means on the housing, which determines how far the shuttle may travel in that position. The amount of tension in the biasing member may also be affected by a self-weighing mechanism that applies an initial amount of force against a biasing member.

Abstract: Reaction force mechanism for backrest of a chair has clear large space under the seat and uses a longer reaction force spring than the prior art. The mechanism includes a base member supported on a leg, a back support member coupled by a rotation shaft to the base member to recline and support the backrest, a seat support member to which the seat is mounted, a weight-dependent reaction force mechanism for moving the seat support member in a lifting direction, and a reaction force spring for applying a spring force for returning the back support member to an original position, in which the reaction force spring is disposed in a lateral orientation between the back support member and the seat support member.

Abstract: A mobile task chair with a control mechanism with adjustment mechanisms and setting indicators. The mobile task chair has a mobile base structure, a control mechanism supported by the base structure, a seat bottom structure supported by the base structure, a seat back structure supported by the base structure, a mechanism for adjusting a physical setting of the mobile task chair, such as the pivoting resistance of the back structure, and a mechanism for providing a visual indication of the pivoting resistance of the mobile task chair.

Abstract: A pivoting mechanism with gross and fine adjustment with a housing, an elongate shaft pivotally retained by the housing, resiliently deformable members retained by the housing, cam members coupled to the shaft wherein the cam members are disposed to deform the resiliently deformable members when the cam members are pivoted, and a locking slide bar for selectively causing the cam members to pivot with the shaft to produce gross adjustments in pivoting resistance. First and second ends of the shaft can act as an output interface for outputting the pivoting resistance exhibited by the shaft to a seat back structure, a seat bottom structure, or some other structure. A threaded rod rotated by a handle can adjust an initial deformation of the first resiliently deformable member for fine pivoting resistance adjustment.

Abstract: A mechanism for an office chair having a backrest support which may be pivoted rearwardly. Adjustment of the backrest pivotal motion is accomplished by the mechanism having a base support which may be positioned on a chair column, a seat support, the backrest support which may be pivoted to the rear, and a pre-tensioned spring arrangement for enabling the mechanism to counter or oppose the movement of the backrest support. The seat support and the base support form a movable unit, which may be moved relative to the chair column depending on the weight of a user applying a load to the seat support. Movement of the movable unit causes an adjustment of the pre-tension of the spring arrangement and/or an adjustment of the spring constant of the spring arrangement.

Abstract: An apparatus for adjusting the seat back angle, and more particularly an adjuster inclinedly disposed at a lower position of the bottom of the seat back and the rear side of the seat portion, comprising a rotating sleeve, an L-shaped connection body, a large spring, a shift shaft, and a locking device. When the locking device is locked, the seat back is positioned at a desirable inclination angle. When the locking device is unlocked, the shift shaft is axially movable such that the seat back is resiliently supported. Moreover, the compression state of the large spring is adjustable by a to-and-fro rotation of the rotating sleeve. In this way, the operators may adjust the resilience of the seat back 200 according to their own needs for obtaining a greatest sitting comfort.

Abstract: The synchronizing device comprises a seat carrier for carrying a seat of said office chair, a seat arm to be connected to a chair column of said office chair, said seat carrier being pivotable in relation to said seat arm about a transverse axis, a backrest arm connected to said seat arm and to said seat carrier such as to be pivotable about a transverse axis, a spring adapted to counter a synchronized movement of said seat carrier and backrest arm, and a sliding member extending substantially in a longitudinal direction of said seat and being articulated to said seat arm, said seat carrier being slidable in relation to said sliding member substantially in said longitudinal direction of said seat.

Abstract: A tilting device for a reclining chair including a support base that can be affixed to at least one pedestal, a mounting body for the back of a seat which is articulated on said support base rotatably around a first axis essentially orthogonal to said pedestal, a mounting plate for the seat of said surface of said seat which has its front end and back end rotatably articulated around a respective hinge axis generally parallel to said first axis respectively to said support base and to said mounting body, elastic means of thrust acting along a direction generally orthogonal to said first axis and having a first end acting on said support base and a second end acting on said mounting body and blocking means of said mounting body in at least two different angles relative to said support base and acting in opposition to said elastic means of thrust, said mounting plate assuming two corresponding different angles.

Abstract: Adjustment device for chairs, comprising a back support capable of rotating around a shaft fastened to a support base, said support for the backrest being provided with a blocking plate having a plurality of openings, an insert capable of limited movement in a defined track in the support base to engage and disengage said openings, and an actuator connected to said insert, in which the actuator is operated by a rod connected to a handle that can be operated by the user, said actuator being movable between a release position and a lock position, in which said insert is selectively engaged in one of said openings.

Abstract: A chair is provided with a base 6 fixed at an upper end of a leg pillar 5, a back support unit 13 attached to the base 6 so as to tilt backward, a backrest 3 attached to the back support unit 13, and a spring unit 14 supporting the backward tilt of the back support unit 13. The spring unit 14 is to expand and contract in a back and forth direction when viewed from above and arranged further behind than a tilt supporting point 16a of the back support unit 13. The back support unit 13, the spring unit 14, and the base 6 constitute a kind of link mechanism and the spring unit 14 will expand and contract mainly at the front end, while tilting backward.

Abstract: The chair includes seat and back assemblies interconnected in a four-bar linkage. The chair further includes a tension mechanism comprising a coil spring projecting forwardly from a base and an adjustment linkage which is connected to said coil spring and to a front link of said four-bar linkage. A back linkage end of said adjustment linkage being axially movable along an axis of said coil spring and a front linkage end being vertically movable along said front link to adjust displacement of said adjustment linkage during rearward pivoting of said front link.

Abstract: A working chair with adjustable backrest support pre-set tension is described, in which a swiveling backrest support is positioned on a seat part, the backrest support being prestressed against the back of the user with a manually adjustable pre-set tension of an energy storing device. The front end of the energy storing device is rotatably mounted on a free, swiveling end of a guide bar close to the seat edge, and the rear end of the energy storing device is coupled to a free, swiveling end of the backrest support at a contact point which is designed to be adjustable and detectable.

Abstract: A chair comprises a seat support with a front seat support part and a rear seat support part which is connected thereto via a pivoting axis. An adjustable length energy storing device serves for adjustment relative to each other of the seat support parts. The energy storing device is pivotably supported on the seat support parts at a distance from the pivoting axis. This distance can be modified by means of an adjusting element by operation of a turning handle. The turning handle is connected to the adjusting element via a coupling element, with the axes of rotation of the adjusting element and turning handle not being in alignment. This ensures conveniently accessible modification of the adjusting force of the energy storing device.

Abstract: A chair comprises a seat support with a front seat support part and a rear seat support part which is connected thereto via a pivoting axis. Seat inclination can be modified by means of an adjusting element by operation of a turning handle. The turning handle is connected to the adjusting element via a coupling element, with the axes of rotation of the adjusting element and turning handle not being in alignment. This ensures conveniently accessible modification of seat inclination.

Abstract: A chair control device for a tiltable chair wherein the chair control includes a a one-piece integral structure mainframe housing, including an integral extension for a seat locking cam means, for supporting adjustment mechanisms. The housing is affixed to the underside of a seat portion of a chair and, optionally, a tailpiece bracket to affix the mainframe to a back portion of the chair. Also included in the device is a tension control means to control the resistance of the tilt motion, the tension control includes an elongated bolt having a first end attached to the mainframe and a second end attached to an adjustment means. A compression spring is inserted on the shaft of the bolt between the adjustment means and the mainframe. The tension control means is adapted to control the tension of the compression spring.

Abstract: A working chair with adjustable backrest support pre-set tension is described, in which a swiveling backrest support is positioned on a seat part, the backrest support being prestressed against the back of the user with a manually adjustable pre-set tension of an energy storing device. The front end of the energy storing device is rotatably mounted on a free, swiveling end of a guide bar close to the seat edge, and the rear end of the energy storing device is coupled to a free, swiveling end of the backrest support at a contact point which is designed to be adjustable and detectable.

Abstract: A method of installing a spring into a chair and a chair with a preload member that prevents a user from removing an initial stress from the spring. The method includes positioning a spring guide in a first position and installing the spring into the chair in an unstressed state. The spring is then stressed by adjusting the spring guide away from the first position. When the spring has been stressed to at least the desired initial stress, the preload member is positioned to prevent the spring guide from being adjusted back to the first position.

Abstract: It is provided for a reclining device for chairs and the chair with said reclining device, comprising an elastic element with linear strain (8) having a first end (8a) abutting against the primary body (2) of a chair, and a half-shell element (12) adapted to house at least a portion of the elastic element (8) starting from a second end (8b) of the latter, said half-shell element (12) having two abutment portions (12b) for a pair of pushing extensions (13) integral with the support element (4) of the reclining back.

Abstract: A method of installing a spring into a chair and a chair with a preload member that prevents a user from removing an initial stress from the spring. The method includes positioning a spring guide in a first position and installing the spring into the chair in an unstressed state. The spring is then stressed by adjusting the spring guide away from the first position. When the spring has been stressed to at least the desired initial stress, the preload member is positioned to prevent the spring guide from being adjusted back to the first position.

Abstract: A tilt control mechanism for an office chair includes a spring arrangement which permits forward and rearward tilting of the chair while also urging the chair to a normal upright position. The spring arrangement includes front and rear springs which act in combination such that the upward acting forces acting on the chair can be varied during use. The forces being applied by the front spring are adjusted by a side-actuated tension adjustment mechanism which incorporates a wedge block for adjusting the spring forces. Further, the rear springs provide a variable spring force such that the spring force is maximized when in the normal position but is decreased substantially once the chair is fully reclined. This reduction in spring force allows a user to maintain the chair in the fully reclined position with significantly less force than was required to tilt the chair rearwardly while a sufficient spring force continues to be applied by the front spring to urge the chair to the normal position.

Abstract: A chair tilt control mechanism includes an actuator handle for locking and unlocking the tilt control mechanism. The actuator handle is a self-contained assembly which is readily mountable to the chair, and includes a hollow housing and a rotatable shaft which is rotatably supported on the housing. The housing includes a V-shaped camming surface and the shaft includes a radial projection which slides axially and circumferentially along the camming surface to positively define locked and unlocked position for actuator handle. The radial projection also defines a stop which allows assembly of the housing and shaft together without fasteners while preventing disassembly when engaged with the camming surface.