Abstract: A mechanism for an office chair has a base support which is placeable on a chair column. A seat support is arranged on the base support and is movable relative to the base support. A backrest support is coupled with the seat support. Pivoting the backrest causes the seat support to move relative to the base support. An alternative solution for adjusting the tilting resistance of the seat support of an office chair is provided where the tilting resistance of the seat support is influenced by the pivoting resistance of the backrest support.

Abstract: A mechanism for an office chair allows a pivoting resistance of a backrest support to be altered. The mechanism for the office chair, in which a small adjustment travel is sufficient in order to realize a large adjustment range of the pivoting resistance of the backrest, has an actuating element connected to the backrest support with a supporting and/or guide track for a functional element. The functional element brings about a change in the spring tension of a spring element during pivoting of the backrest support.

Abstract: A mechanism for an office chair is structurally particularly simple and consequently comparatively inexpensive, but nevertheless extremely variable. Both the seat support and the backrest support are articulated by way of a common pivot axis. The seat support is connected in an articulated manner to the base support by way of at least one pivot bolt and is pivotable relative to the base support. The backrest support is connected in an articulated manner to the base support by way of the at least one pivot bolt and is pivotable relative to the base support.

Abstract: An office chair mechanism includes a base support for placement on a chair column, a seat support on the base support being movable relative to the base support and a backrest coupled to the seat support. Pivoting the backrest moves the seat support relative to the base support. A track element is movably connected at a base support connecting point to the base support and at a seat support connecting point to the seat support to adjust pivoting resistance of the backrest. Pivoting the backrest alters position and/or location of the track element. A spring element acting on the track element and on the seat support or on the backrest and/or a backrest support is acted upon with a movement of the seat support relative to the base support. An adjustment device alters the position of a point of action of the spring element on the track element.

Abstract: A mechanism for an office chair is structurally particularly simple and consequently comparatively inexpensive, but nevertheless extremely variable. Both the seat support and the backrest support are articulated by way of a common pivot axis. The seat support is connected in an articulated manner to the base support by way of at least one pivot bolt and is pivotable relative to the base support. The backrest support is connected in an articulated manner to the base support by way of the at least one pivot bolt and is pivotable relative to the base support.

Abstract: A synchronizing mechanism provides a correlated seat-backrest movement of an office chair. To provide a self-adjusting synchronizing mechanism which is structurally simple, a backrest support is flexibly connected directly both to a base support so as to be pivotable about a transverse axis and to a seat support such that a pivoting movement of a backrest from an initial position into a rearwardly pivoted position induces an immediate lowering movement of the rear region of the seat support, when viewed in the longitudinal direction of the chair, rearwardly downward. The seat support is flexibly connected to the base support by a coupling element which is hinged to the seat support and to the base support such that when the backrest performs the pivoting movement from the initial position into the rearwardly pivoted position, an immediate lifting movement of the front region of the seat support, is effected rearwardly upward.

Abstract: In order to provide an adjustment mechanism for the arm support of an armrest, which is particularly simple structurally and which also enables a particularly flat style of construction, a locking device is proposed for releasably locking the base platform and the carrier platform in different positions with respect to each other, said locking device comprising a transfer element, which is arranged between carrier platform and arm support and is connected to the base platform and which has first blocking elements for blocking the longitudinal adjustment of the arm support and second blocking elements for blocking the transverse adjustment of the arm support, and an actuating element, which is arranged between carrier platform and arm support and is provided with a control button for manual actuation and which has elements for simultaneously blocking or releasing the first and second blocking elements of the transfer element.

Abstract: A chair has a rocking mechanism with a fixed base support having a conical receptacle to be placed on a chair pillar. The base support is pivotally connected to a mechanism upper part which forms a housing at least partially enclosing the base support. A pivot axis of the mechanism upper part runs transversely to the chair longitudinal direction and is arranged next to the conical receptacle, as seen in the chair longitudinal direction. A spring element acts between the mechanism upper part and the base support for returning the mechanism upper part from a pivoted position into a starting position. The rocking mechanism is fastened via the mechanism upper part to a seat, a seat support, or a frame of the chair, or else, the rocking mechanism is integrated so that part of the seat, seat support or chair frame forms the mechanism upper part.

Abstract: A mechanism for an office chair includes an adjusting device and an electromotive drive used to actuate the adjusting device to simplify manipulation of the adjusting device for changing a movement characteristic of the office chair.

Abstract: A mechanism for an office chair has a displaceable actuating element. The position of the element changes during a movement of the office chair mechanism, and the change in position thereof changes the movement characteristic of the office chair mechanism. The actuating element is operationally connected to a functional element. The position of the functional element changes in the event of a change in the position of the actuating element during a movement of the office chair mechanism. At least one property of the change in position of the actuating element changes in the event of a change in the position of the functional element.

Abstract: An office chair has a base support, a seat support and a backrest support. A synchronizing mechanism for a correlated seat/backrest movement has the seat support articulated directly on a first pivot bearing of the base support, the backrest support articulated directly on a second pivot bearing of the base support, and the backrest support connected to the seat support via an articulation. The articulation axis of the articulation, as seen in the longitudinal direction of the seat, is in front of the pivot axis of the second pivot bearing, such that a pivoting movement of the backrest to the rear about the pivot axis of the second pivot bearing induces a rotation of the seat support about the pivot axis of the first pivot bearing and thus a lifting movement of just the front region of the seat support.

Abstract: The invention relates to a synchronizing mechanism for a correlated seat-backrest movement of an office chair, said mechanism including a base support (1) that can be placed on a chair column, a seat support (3) and a backrest support (4). In order to provide a synchronizing mechanism, by means of which a high level of seating comfort can be achieved in an inexpensive manner, a mechanism is proposed where the backrest support (4) is connected to the base support (3) so as to be pivotable about a transverse axis (8) and has an entrainment means (9) that is in operative connection with the seat support (3) in such a manner that when the backrest carries out a pivoting movement (6) backward, the seat support (3) also performs a movement (13) backward.

Abstract: A chair has a rocking mechanism with a fixed base support having a conical receptacle to be placed on a chair pillar. The base support is pivotally connected to a mechanism upper part which forms a housing at least partially enclosing the base support. A pivot axis of the mechanism upper part runs transversely to the chair longitudinal direction and is arranged next to the conical receptacle, as seen in the chair longitudinal direction. A spring element acts between the mechanism upper part and the base support for returning the mechanism upper part from a pivoted position into a starting position. The rocking mechanism is fastened via the mechanism upper part to a seat, a seat support, or a frame of the chair, or else, the rocking mechanism is integrated so that part of the seat, seat support or chair frame forms the mechanism upper part.

Abstract: An office chair or office chair element, such as a backrest or seat, has a flat covering element, such as a fabric, cushioning or webbing element, secured to support elements, such as the arms of a support frame, and tensioned in between. The covering element is provided with a welt strip that, in the fitted state, is placed in an accommodating groove in the support element. The accommodating groove has two oppositely situated contact faces for the welt strip and one of the contact faces is provided with a projection that projects into the accommodating groove and extends in the longitudinal direction of the groove. The welt strip can be pressed into the accommodating groove, resiliently deforming the projection and/or the welt strip and the welt strip, in the fitted state, is positively locked and/or friction-locked in the groove with abutment against the contact faces, with the projection preventing the welt strip from escaping from the accommodating groove.

Abstract: In order to provide an adjustment mechanism for the arm support of an armrest, which is particularly simple structurally and which also enables a particularly flat style of construction, a locking device is proposed for releasably locking the base platform and the carrier platform in different positions with respect to each other, said locking device comprising a transfer element, which is arranged between carrier platform and arm support and is connected to the base platform and which has first blocking elements for blocking the longitudinal adjustment of the arm support and second blocking elements for blocking the transverse adjustment of the arm support, and an actuating element, which is arranged between carrier platform and arm support and is provided with a control button for manual actuation and which has elements for simultaneously blocking or releasing the first and second blocking elements of the transfer element.

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: A mechanism for an office chair has a displaceable actuating element. The position of the element changes during a movement of the office chair mechanism, and the change in position thereof changes the movement characteristic of the office chair mechanism. The actuating element is operationally connected to a functional element. The position of the functional element changes in the event of a change in the position of the actuating element during a movement of the office chair mechanism. At least one property of the change in position of the actuating element changes in the event of a change in the position of the functional element.

Abstract: A permanent-contact mechanism for an office chair or the like is formed as a comparatively flat permanent-contact mechanism with a seat frame, which can be positioned on a chair upright, with a backrest support, which is arranged on the seat frame such that it can be pivoted about a transverse axis, and with at least one spring-activated or inherently resilient lever element, which interacts with the backrest support such that the backrest support is always pivoted counter to a spring force. The position of the point of rotation of the lever element differs from the position of the transverse axis.