EP2896326A1 - Seating furniture, in particular a chair - Google Patents

Abstract

A chair, in particular a chair (11) has a support part (13) which can be mounted on a column (65) of a chair frame, a backrest support (15) and a seat support (19) hingedly connected to the support part (13) are. Backrest support (15) and seat support (19) are connected to one another such that when the backrest support (15) is pivoted backwards, the seat support (19) is raised at least in places and moved backwards, and vice versa. The seat support (19) is connected in the front region by means of a slotted guide (25) with the support member (13).

Description

The invention relates to a chair, in particular a chair with a support member, a backrest support and a seat support, which are hingedly connected to the support member, wherein the backrest support and seat support are coupled together so that at a back-pivoting of the backrest support the seat support at least partially raised and moved backwards.

State of the art

The publication DE-OS-36 17 624 shows a chair with a seat support on which a seat plate is supported by means of a rear and a front link. Furthermore, the chair has a seat support pivotally hinged backrest support. The seat carrier is connected via a front and a rear parallelogram with a stationary tilt beam, which is fixed to the chair base. The parallelogram also be connected by means of a parallel control arm articulated. A first power storage is effective between seat support and tilt bracket, while a second power storage between backrest support and seat support is effective. In such a chair, the force required for the inclination of the backrest is dependent on the weight of the user. A user with a higher weight needs to apply a greater force to the back of the backrest than a user with a lower weight. Characteristic of this chair is that in a backrest movement of the Seat synchronously moved. The seat is lowered at a backrest movement to the rear more than the front.

The patent EP 2398355 B1 discloses a chair with a seat and a backrest support, both mounted on a support member. The backrest support is pivotable about a horizontal pivot axis and is in connection with a force accumulator, which acts at a distance from the pivot axis on the backrest support and is tensioned under load of the seat. The chair of the EP 2398355 B1 is characterized in that the energy storage on the one hand engages the support member and on the other hand is connected via a cross connector with the backrest support. The seat is articulated in a bearing on the transverse connector between its connection to the energy storage and with the backrest support. The proposed construction of the chair mechanism has the advantage that pivoted by a load on the seat of the cross connector on the backrest support and thereby biases the energy storage. The restoring force of the energy accumulator causes the back support to return to the upright position.

U.S. Patent No. 6,959,965 shows a chair with a base to which on each side a backrest support is articulated at a first point of articulation. An over the first pivot point extending extension of the backrest support is hinged at the rear over a second pivot point on a seat support. At the front, the seat support is also pivotally connected to the base by means of a lever. The lever is connected to the base by means of a third articulation point and to the seat support by means of a fourth articulation point. The extension of the backrest support and the levers together form one Parallelogram connection, which, when pivoting the backrest carrier backwards, causes the seat carrier to move from a low forward position to a rearward raised position. A spring acting between the base and the backrest supports biases the backrest support in the upright position. An advantage of the chair described is that the weight of the chair user acts on the chair mechanism and automatically adjusts the force for rearward pivoting of the seat back support.

task

Object of the present invention is to provide a chair which manages with as few parts and thus is easy and inexpensive to manufacture. Above all, the many adjustable springs, screws and adjusting mechanisms are to be omitted, which leave little design freedom for an aesthetically pleasing chair. Yet another object is to provide a chair in which the restoring force is achieved by the weight of the person. The design should be such that regardless of the weight of the person - the chair always works the same and generates the weight of the person corresponding stronger or weaker restoring force of the backrest.

description

The present invention relates to a chair, in particular chair with a support member which may be mounted on a column of a chair frame. The chair has a backrest support and a seat support, which are hingedly connected to the support member such that at a back-pivoting the backrest support the seat support at least partially raised and moved backwards.

According to the invention, the seat carrier is connected in the front region by means of a slotted guide with the carrier part. This has the advantage that, in comparison to the parallelogram connections frequently encountered in the prior art with a total of 4 articulation points, only 3 of which are necessary. Accordingly, fewer parts than in the prior art chair mechanisms are needed. Consequently, a chair mechanism according to the invention can be produced inexpensively. Another advantage of the invention is that it is possible to dispense with a return spring which is customary in the prior art. The front portion means the front half and preferably the front third of the seat support. "Front" refers to the back of the chair opposite side of the chair and "back" that side of the chair on which the backrest is arranged.

Advantageously, the backrest support is articulated at a first point of articulation with the support part and with an extension of the backrest support extending beyond the first articulation point to the seat support at a second articulation point. This construction has the advantage that a one-piece backrest support can be used.

Conveniently, the slide guide is formed by a slide and a sliding element. In this case, the slide can be formed or provided on the seat support or on the support part. Accordingly, the sliding element is arranged either on the carrier part or on the seat carrier. Both variants are to be regarded as equivalent in function.

Advantageously, in the upright position of the backrest, the extension of the backrest support with an imaginary horizontal angle between 55 and 85 degrees, preferably between 60 and 80 degrees and more preferably between 65 and 75 degrees (effectively 68 °). The larger the angle of the extension, the smaller the rear area of the seat is raised when pivoting the backrest.

Conveniently, in the upright position of the seat back support, the slide with an imaginary horizontal angle between 100 and 140 degrees, preferably between 110 and 130 degrees, and more preferably between 115 and 125 degrees. By appropriate choice of the inclination of the slideway can be achieved that the front seat area is raised more than the rear.

According to an advantageous embodiment, the carrier part is represented by two spaced apart from and parallel to each other profiles, which are interconnected by a connecting plate. This is a simple and convenient construction that is inexpensive to implement. It can be provided in the form of a slot at the front end of the profiles depending on a slideway.

In a further preferred embodiment, the carrier part is a carrier spider with three ends, wherein at one end of the first articulation point is arranged and at the other two ends in each case a slotted guide is arranged. The carrier spider has three carrier arms, where the pivot point only requires one carrier arm. The carrier spider has the advantage that it can be formed in one piece and only a first pivot point is necessary.

Conveniently, the backrest support is formed by two angled and spaced-apart profiles, which are arranged rotationally fixed on an axis. The axle can be accommodated in passage openings at the rear end of the profiles, wherein the extensions are arranged rotationally fixed at the axle ends.

Advantageously, cams for articulating the same with the seat and the backrest support are provided on the underside of the seat support. Seat support and cams can be made as an injection molded part.

In principle, it is conceivable that the seat and the backrest are balanced against each other so that the backrest is moved back by the weight of the seat in the upright position. However, it can also be provided a spring element which is supported at one end on the support part and the other end on the backrest support or on the seat support. This allows the backrest support to be biased in the upright position. After deflection, the spring element allows easier return to the upright position.

In a further particularly preferred embodiment, the spring element is a torsion spring which is arranged around the first or second articulation point. Preferably, the arrangement is about the first articulation point, although the arrangement about the second articulation point would also be conceivable. The torsion spring is arranged to save space in a cylindrical or angular housing whose central axis corresponds to the first articulation point. The torsion spring ensures that the backrest is biased in the upright position when the chair is not in use.

Figur 1

Ein erstes Ausführungsbeispiel eines erfindungsgemässen Stuhls in Seitenansicht, wobei die Rückenlehne sich in der aufrechten Position befindet;

Figur 2

Den Stuhl von Fig. 1 mit der nach hinten verschwenkten Rückenlehne;

Figur 3

Ein zweites Ausführungsbeispiel eines erfindungsgemässen Stuhls in Seitenansicht mit der Rückenlehne in der aufrechten Position;

Figur 4

Den Stuhl von Fig. 3 mit der Rückenlehne in der nach hinten verschwenkten Position;

Figur 5

Eine perspektivische Unteransicht des Stuhls von Fig. 3;

Figur 6

Ein drittes Ausführungsbeispiel eines erfindungsgemässen Stuhls in Seitenansicht mit der Rückenlehne in der aufrechten Position;

Figur 7

Eine Schnittdarstellung des Stuhls aus Figur 6 mit einem Anlenkpunkt im Detail;

Figur 8

Eine Schnittdarstellung des Stuhls aus Figur 6 mit einer Kulissenführung im Detail und

Figur 9

Eine perspektivische Unteransicht des Stuhls von Fig. 6.

Embodiments of the invention will now be described with reference to the drawings. It shows:

FIG. 1

A first embodiment of a chair according to the invention in side view, wherein the backrest is in the upright position;

FIG. 2

The chair of Fig. 1 with the backrest pivoted to the rear;

FIG. 3

A second embodiment of a chair according to the invention in side view with the backrest in the upright position;

FIG. 4

The chair of Fig. 3 with the backrest in the backward pivoted position;

FIG. 5

A bottom perspective view of the chair Fig. 3 ;

FIG. 6

A third embodiment of a chair according to the invention in side view with the backrest in the upright position;

FIG. 7

A sectional view of the chair FIG. 6 with a pivot point in detail;

FIG. 8

A sectional view of the chair FIG. 6 with a slide guide in detail and

FIG. 9

A bottom perspective view of the chair Fig. 6 ,

That in the FIGS. 1 and 2 shown first embodiment of an inventive chair 11 comprises as essential components a support member 13, a backrest support 15 which is pivotally mounted about an axis of rotation 17 on the support member 13 and carries a backrest 16, and a seat support 19 which is movably disposed on the support member 13 and a seat cushion 20 carries. In the back area is the seat support 19 hinged to an extension 21 of the backrest support 15 (axis of rotation 23). In the front region of the seat support 19 is movably connected by means of a sliding guide 25 with the support member 13. The slide guide 25 consists of a slide 27, which is integral with the seat support 19, and a sliding member 29 which is fixedly arranged on the support member 13. If in this chair mechanism the backrest support 15 is moved to the rear, ie more inclined, the seat support 19 is simultaneously pivoted backwards and forwards by the mechanical coupling.

In the normal position of the backrest support 15, the extension 21 assumes an angle between 55 and 85 ° relative to an imaginary horizontal (angle α) and in this embodiment effectively an α of 68 °. In contrast, the slide 27 is in the normal position of the backrest support 15 at an angle between 130 and 160 ° (effectively 120 ° in this embodiment) relative to an imaginary horizontal arranged (angle ß). Ie slideway 27 and extension 21 are oriented against each other. In an entanglement of the backrest to the rear of the seat support is thus moved back towards the backrest support 15 and upwards. Sliding track 27 and extension 21 are advantageously arranged at an angle relative to an imaginary horizontal, that when the backrest support 15 is pivoted rearwardly, a front seating area 31 is raised more than a rear seating area 33. The maximum deflection of the backrest carrier 15 can thereby be increased be limited by the length of the slide 27.

In the exemplary embodiment shown, the backrest 16 comprises a back shell 35 and a back cushion 37 fastened to the back shell 35. The backrest 16 is convex toward the front and is thus modeled on the normal curvature of the human spine (lordosis support). The chair mechanism is designed such that the distance between a lumbar support point 41 and a seat recess 43 remains essentially the same when the backrest is adjusted. This prevents the chair wearer when adjusting the backrest, the shirt is pulled out of his pants.

In the following description of the in the FIGS. 3 to 5 shown second embodiment of a chair according to the invention, the same reference numerals are used for the same or at least functionally identical parts. The second embodiment differs from the one described above in a differently shaped support member and a differently designed backrest support.

The support member 13 is as out FIG. 5 can be seen, formed by two spaced from each other and parallel to each other, elongated profiles 45a, 45b, which are interconnected by a connecting plate 47. The front end of the profiles 45a, 45b is formed by a respective leg 49a, 49b arranged at an angle to the profiles 45a, 45b in which a slit 51a, 51b serving as a slideway is formed. In the slots 51a, 51b engages a sliding member 29a, 29b that is attached to provided on the seat support 19 cam 53a, 53b.

The rear end of the profiles 45a, 45b is formed by an angled end piece 55a, 55b, in each of which a passage opening 57a, 57b is provided for an axle 59. The axis 59 is rotatably connected to two spaced-apart backrest supports 15a, 15b. Also rotatably connected to the axis 59 are two arranged at the ends of the handlebars 61a, 61b, which are rotatably arranged at one end to the axis 59 and the other end to cams 63a, 63b of the seat support 19 are hinged. Due to the mechanism described seat consisting of seat support 19 and seat cushion 20 is synchronously moved in a pivoting of the backrest.

How out Fig. 5 can be seen, a chair column 65 may be fixedly arranged on the connecting plate 47. However, other chair or seating frames are also conceivable.

In the following description of the in the FIGS. 6 to 9 shown third embodiment of a chair according to the invention, the same reference numerals are used for the same or at least functionally identical parts. In the third embodiment, the carrier part is formed as a three-armed carrier spider 13. At the two front arms is in each case a slide guide 25 with a sliding member 29, which is guided in a slide 27, arranged ( FIG. 8 ). The sliding element 29 is realized in this embodiment as a roll.

As already explained above, the backrest support 15 is pivotable about a rotation axis 17 on the support part 13. Around the axis of rotation is a torsion spring 67th arranged, which is received in a cylindrical or rectangular in cross-section housing 69 ( FIG. 7 and 9 ). The torsion spring 67 is supported on the support part 13 and the backrest support 15 in such a way that it is biased. This bias causes the torsion spring 67 always pushes the backrest 16 in the upright position when the chair 11 is not used. In this embodiment, the extension 61a, 61b of the backrest support 15 extending from the second pivot point 23 to the first pivot point 17. The leverage of the backrest 16 on the seat support 19 can be determined by the arrangement of the extensions 61a, 61b relative to the backrest support 15 and the lever length become.

In the FIG. 9 the shape of the backrest support 15 according to the third embodiment is shown. The backrest support 15 has in contrast to the backrest support of the second embodiment ( FIG. 5 ) an integral design. Instead of the profiles 15a, 15b is a cup-shaped member having a waist 71, in which the extensions 61a, 61b are integrated.

In the embodiments described above, the chair is mirror-symmetrical with respect to a front-to-back center axis. The invention is not limited to the embodiments shown, but can also be used in other seating furniture (armchairs, sofas and the like).

Claims (16)

Seating furniture, in particular chair (11) with a support part (13) which can be mounted on a column (65) of a chair frame, - A backrest support (15) and - A seat support (19) which are pivotally connected to the support part (13), wherein the backrest support (15) and seat support (19) are interconnected so that in a rearward pivoting of the backrest support (15) of the seat support (19 ) is at least partially raised and pushed backwards, and vice versa,
characterized in that
the seat support (19) in the front region by means of a sliding guide (25) is connected to the carrier part (13). Seating furniture according to claim 1, characterized in that the backrest support (15) at a first articulation point (17) with the support part (13) and with an over the first pivot point (17) also extending extension (61) of the backrest support (15) the seat support (19) at a second articulation point (23) is articulated. Seating furniture according to claim 1 or 2, characterized in that the slotted guide (25) by a slide (27) and a sliding element (29) is formed. Seating furniture according to claim 3, characterized in that the slide track (27) on the seat support (19) is formed or arranged. Seating furniture according to claim 3, characterized in that the slide track (27) on the support part (13) is provided. Seating furniture according to one of claims 1 to 5, characterized in that in the upright position, the extension (61) of the backrest support with an imaginary horizontal an angle between 55 and 85 degrees, preferably between 60 and 80 degrees and more preferably between 65 and 75 degrees occupies. Seating furniture according to one of claims 1 to 6, characterized in that in the upright position of the backrest support (15) the slideway (27) with an imaginary horizontal an angle between 100 and 140 degrees, preferably between 110 and 130 degrees and particularly preferably between 115 and takes up 125 degrees. Seating furniture according to one of claims 1 to 7, characterized in that the carrier part (13) by two spaced from and parallel to each other arranged profiles (45a, 45b) is formed, which are interconnected by a connecting plate (47). Seating furniture according to one of claims 1 to 7, characterized in that the carrier part is a carrier spider (13) with three ends, wherein at one end of the first articulation point (17) is arranged and at the two other ends in each case a slotted guide (25) is arranged , Seating furniture according to claim 8, characterized in that at the front end of the profiles (45) each have a sliding track (27) in the form of a slot (51) is formed. Seating furniture according to one of claims 1 to 10, characterized in that the backrest support (15) by two angled and spaced apart profiles (15a, 15) is formed, which are arranged rotationally fixed on an axis (17). Seating furniture according to claim 11, characterized in that the axis (17) is received in passage openings at the rear end of the profiles (45a, 45b), wherein at the ends of the extensions are arranged rotationally fixed. Seating furniture according to one of claims 1 to 12, characterized in that on the underside of the seat support (19) cams (53) for articulated connection with the seat and the backrest support (15, 19) are provided. Seating furniture according to one of claims 1 to 13, characterized in that a spring element is provided, which at one end on the support part (13) and the other end on the backrest support (15) or on the seat support (19) is supported. Seating furniture according to claim 14, characterized in that the spring element is a torsion spring which is arranged around the first or second articulation point (17, 23). Seating furniture according to one of claims 1 to 15, characterized in that the extension (61) of the backrest support (15) engages in the rear half, preferably in the rear third of the seat support (19).

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