EP1989963A1 - Seating furniture with seat board and backrest - Google Patents

Abstract

The furniture has a support (16), seat plate (1) and backrest (2) arranged at a support arm (3) opposite to the support. The seat plate is supported at a longitudinally extending flexible spring (4) that is connected with the support arm. The flexible spring is arranged such that the flexible spring is elastically moved during loading the seat plate transversal to the longitudinal extension. The flexible spring is fixed at the support arm in a torque-proof manner, where flexible spring includes a free end (5), in whose area the seat plate is pushed away at the flexible spring.

Description

The present invention relates to a chair with at least one seat plate and at least one arranged on at least one support arm backrest, wherein the seat plate is supported on at least one connected to the support arm elongated bending spring and the bending spring is arranged so that it is transverse to the load on the seat plate Elongation is elastically deflectable.

In the prior art, so-called synchronous mechanisms are known for seating furniture, in particular office chairs. These allow the backrest of the user simultaneous pivoting of the backrest and the seat takes place, wherein the pivot angle of the backrest is greater than that of the seat. The DE 196 07 136 shows an office chair with such a synchronous mechanism, which requires a relatively large number of pivot or pivot joints and a longitudinally acting spring. Although the construction revealed there ensures good ergonomics, the construction of this chair is relatively complex.

From the AT 411 210 B an office chair is known in which an elongated bending spring is deflected transversely in the form of a spring package. This spring assembly is bolted to a carrier housing, which in turn is connected to the support arm supporting the backrest via a pivot joint. Also, this construction is relatively expensive in terms of the number of items and thus the cost of assembly.

A generic prior art, in which an elongated bending spring is connected to the support arm, is in the EP 1 209 994 B1 shown. In this construction, but also a pivot joint between the support arm and bending spring is required, which in turn means a relatively high design effort.

Object of the present invention is to improve a generic seating to the effect that the required for its construction number of parts and thus the cost of assembly is reduced.

This is achieved with a chair with the features of claim 1.

As in the prior art, the seating furniture has a support, at least one seat panel and at least one backrest arranged on at least one support arm. The seat plate is supported on at least one longitudinally extending bending spring connected to the carrier arm. The bending spring is arranged so that it is elastically deflectable when loaded the seat plate transversely to its longitudinal extent.

According to the invention, however, a rotationally fixed fixation of the spiral spring is provided on the support arm, ie a direct connection of spiral spring and support arm without the interposition of rotary or pivot joints or other, a relative movement between bending spring and support arm permitting components. It can thereby be saved between the torsion or pivot axes and their guides between the bending spring and the support arm associated with the rotary or pivot joints, resulting in a simple construction and a saving of parts. In the course of the invention was surprisingly found that despite this simple construction, the production of a chair with good ergonomics and synchronous mechanism is possible.

The transverse spring, that is to say deflectable transversely to its longitudinal extent, advantageously has a greater elasticity than the carrier arm. This means that the bending spring is deflected more elastically with the same torque than the carrier arm and thus the elasticity of the mechanism formed thereby is provided essentially by the spiral spring.

A particularly preferred embodiment in terms of reducing the number of individual parts of the chair provides that the support arm and the bending spring are made in one piece, ie in the form of a substantially continuous component. This component can, for. B. by injection molding o. The like. Are made quickly and easily. There is no additional effort for the connection of these two parts z. B. by screwing, riveting or gluing.

In other embodiments of the invention can also be provided that the support arm and the bending spring are designed as separate components, which are then connected to each other in a connection region. Preference is given to releasable compounds such. B. screwing or riveting. But it can also be the bonding of spiral spring and support arms in the connection area o. The like. Be provided. Advantage of these variants of the invention is that the material from which the support arm is made, can be selected completely independent of the material required for the bending spring. If one chooses this embodiment, substantially stiff materials can also be used for the support arm. The spiral spring can in these cases z. B. as a leaf spring or as Be formed leaf spring package. The seat plate is supported preferably in the region of its half facing away from the backrest, preferably in the region of the backrest farthest third, on the spiral spring from.

A bearing device consists for example of a shaft on the seat plate and a slot in the seat plate or belonging to a support carrier housing for the seat plate. The slot allows a relative movement between the seat plate and the support with a vertical position in the operating position of the chair. The seat plate may be supported directly or indirectly on the bending spring, preferably on its free end opposite the support arm. In an indirect support, the spiral spring strikes the bearing device and the slot is formed in the carrier housing. In direct support, the seat plate strikes against the spiral spring and the slot in which the shaft is movably mounted, is formed in the seat plate. In this vertical component of the relative movement between the seat plate and the support, the bending spring is tensioned when the seat plate is loaded, and relaxed when the seat plate is relieved. It may also be provided a support of the seat plate on the bending spring, which allows a relative movement between the seat plate and bending spring with a horizontal position in the operating position of the seat component. The horizontal relative movement necessary for a synchronous mechanism with three articulation points can be realized for each of the three articulation points. In order to ensure a controlled synchronous movement in predefined limits, this bearing means conveniently has stops which limit the relative movement between the spiral spring and seat plate in the vertical direction. Corresponding stops for limiting the horizontal relative movement are also expedient.

A simple embodiment of the bearing device for enabling the vertical relative movement between the seat plate (together with the free end of the leaf spring) and support has at least one slot. If the horizontal relative movement between the free end of the spiral spring and the seat plate is also to be allowed, two oblong holes arranged at an angle deviating from 0 ° are provided.

In the slot for the vertical relative movement or the slots for vertical and horizontal relative movements a shaft is slidably mounted. It is preferably this wave, which is supported in the region of the free end of the spiral spring on this. In the case of two oblong holes, these are advantageously arranged substantially perpendicular to one another.

It can be made of plastic, the support arm and / or the bending spring, wherein this plastic is preferably at least partially fiber reinforced. Preferably, the support arm and / or the bending spring, preferably in each case over its substantially entire length, a core region with fiber-reinforced plastic, which is surrounded by a cladding region with plastic without fiber reinforcement. This embodiment allows a one-piece construction of the carrier arm and bending spring, so that together they form a substantially continuous component.

In order to obtain a stiffer arm and a more elastic bending spring, the spiral spring may have a smaller cross-section and / or a different material composition than the support arm.

In an alternative in which the spiral spring is screwed to the support arm and / or riveted and / or glued, a suitable material can be used for each of these parts. Thus, in particular, the bending spring may be a leaf spring or a leaf spring package.

In order to be able to realize a synchronous mechanism, the carrier arm together with the bending spring on the seat plate, preferably on the underside of the seat plate, is articulated via at least one in the operating position of the seat substantially horizontal seat plate pivot axis. The seat plate pivot axis is rotatably arranged on the seat plate and / or the support arm and / or the bending spring. It may otherwise be arranged stationary thereto, or allow a displacement in a preferably horizontal direction between the seat plate and the support arm / bending spring.

The seat plate pivot axis is in the region of the backrest next half of the seat plate, preferably in the region of the backrest next third of the seat plate, arranged thereon, in order to achieve a pleasant synchronous movement between the seat tilt and backrest tilt. The support arm and the bending spring are articulated together via at least one in the operating position of the chair substantially horizontal Trägergehäuseschwenkachse on a connected to a base frame or support carrier housing pivotally. Also in this point of articulation, the carrier housing pivot axis can be mounted displaceably in the horizontal direction with respect to the carrier arm / bending spring or with respect to the carrier housing. The carrier housing pivot axis is preferably optionally rotatable but otherwise fixedly arranged on the carrier housing and / or the carrier arm and / or the bending spring.

A support forms a supporting base. It has a pedestal, a column and a carrier housing, wherein the stand is connected via the column to the carrier housing and is preferably rotatable about a vertical axis in the operating position of the seat relative to the carrier housing. Conveniently, the carrier housing with respect to the column is not tilted. It is therefore not formed in the operating position of the seat horizontal axis between the support housing and the stand.

The support arm is preferably formed at least in regions as a pair of carrier arms, on which rotationally fixed fixed bending springs are arranged.

The inventive non-rotatable fixation of the spiral spring on the support arm can be implemented in its various embodiments particularly preferred in the manufacture of chairs, office chairs and especially in so-called swivel chairs with a rotatable about a vertical axis seat plate.

It is advantageous, and this is especially provided in office chairs, a setting of a bias of the bending spring. This bias can be realized in the storage device in a simple manner by the shaft is rotatable and is equipped in the region of the bending spring with an eccentric. By rotating the shaft so that the bending spring of the eccentricity of the eccentric is biased accordingly. There are preferably provided three positions of the eccentric in which it engages.

• Die Fig. 1 bis 4 einen ersten erfindungsgemäß ausgebildeten Drehstuhl;
• die Fig. 5 eine zweite Ausführungsform eines erfindungsgemäß ausgeführten Drehstuhls und
• die Fig. 6 eine dritte Variante eines Drehstuhls gemäß der Erfindung.

In the figures, three different embodiments are shown schematically. Showing:

• The Fig. 1 to 4 a first inventively designed swivel chair;
• the Fig. 5 a second embodiment of an inventively designed swivel chair and
• the Fig. 6 a third variant of a swivel chair according to the invention.

In the first embodiment according to the FIGS. 1 to 4 the support arm 3 and the bending spring 4 are designed as an integrally continuous component. At in the operating position upwardly facing portion of the support arm 3, as known per se, the backrest 2 is attached. In a preferred embodiment variant can even be provided that the backrest 2, the support arm 3 and the bending spring 4 are integrally designed as a built-in part. The preparation may, for. B. done by injection molding. Preference is given to plastics, such as. As polypropylene, fiber reinforced polypropylene o. The like. For use. Fig. 3 shows an example of a cross section through the support arm 3. In this variant, the support arm 3 and the bending spring 4 and optionally also the backrest 2 of a so-called Two-component material. The core region 21 in this case consists of a fiber-reinforced plastic, such as. B. fiber reinforced polypropylene. This core region 21 is surrounded by a cladding region 22, is used for the plastic without fiber reinforcement. Again, polypropylene can be used. This construction of core region 21 and jacket region 22 preferably extends in each case over substantially the entire length of the carrier arm and / or the bending spring. Essentially the entire length means preferably at least 90%, preferably at least 95% of the component length. In order to give the bending spring 4 a greater elasticity than the support arm 3, the bending spring 4 in accordance with the exemplary embodiment Fig. 1 a smaller cross-sectional area than the support arm 3. In order to provide this difference in the elastic properties, but of course instead of or in addition to the difference in the effective cross-section, the material composition of the spiral spring 4 can be changed relative to the support arm 3. So z. B. also in the spiral spring 4 a lesser degree of fiber reinforcement than in the support arm 3 may be provided.

In the embodiment according to the Fig. 1 to 4 extends the bending spring 4 under the seat plate 1 from its free end 5 to the end of the area with reduced cross-section just before the Trägergehäuseschwenkachse 15. The latter is arranged horizontally in the operating position shown and forms part of a pivot joint between the support arm 3 and the support housing 17. Das Carrier housing 17 is the connecting part between the base frame 16 of the seat and the support arm 3. In the illustrated embodiment, the support housing 17 is fixed to a vertical position in operating position column 18, which in turn is mounted in here formed as a cross stand 19. The stand 19 has, as also known per se, rollers 20 for moving the swivel chair. The carrier housing 17 is rotatable relative to the base 19, as known per se, about an axis 24 which is vertical in the operating position. A rotation or pivoting of the carrier housing 17 relative to the column 18 or the pedestal 19 about a horizontal axis is not provided in all embodiments shown. The illustrated construction of the undercarriage 16 of rollers 20, stand 19 and column 18 is favorable for office or swivel chairs. The invention is not limited to such embodiments of seating. It may well be other seating, such. B. chairs with several chair legs or benches be inventively designed.

The seat plate 1, which as known per se, can carry a seat cushion is in the shown embodiments in its rear, the backrest 2 facing region via a rotary or pivot joint about a horizontal seat plate pivot axis 14 pivotally mounted on the support arm 3. The seat plate pivot axis 14 is conveniently located in the sense fixed to the seat plate 1 and / or the support arm 3 and / or the bending spring 4, as that they are not in can be moved horizontally in the vertical direction relative to said components. The position of the seat plate pivot axis 14 is, viewed in the horizontal direction, conveniently in the region of the backrest 2 facing half of the seat plate 1, preferably in the region of the backrest 2 next third of the seat plate. 1

The second pivot joint is formed by the already mentioned carrier housing pivot axis 15. With this, the support arm 3 is articulated in the immediate vicinity of the column 18 on the carrier housing 17. Also, this pivot axis 15 is in the embodiments shown in neither horizontal nor in the vertical direction relative to the support housing 17 and the support arm 3 displaced. Their position is, seen in the horizontal, between the seat plate pivot axis 14 and the bearing means 6. About the bearing device 6, the seat plate 1 is supported with its remote from the backrest 2 front on the spiral spring 4 in the region of the free end 5 of the spiral spring 4 from , This area of the free end 5 is preferably formed by the foremost 10 to 15% of the elongated bending spring 4. The front portion of the seat plate 1, in which this is supported on the spiral spring 4, is conveniently located in the horizontal direction, in the backrest 2 facing away from half of the seat plate 1, preferably in the region of the backrest 2 weitest arranged third. The bearing device 6, with which the seat plate 1 is supported on the spiral spring 4, allows a relative movement between the seat plate 1 and spiral spring 4 in both the horizontal, as well as in the vertical direction. In order to ensure defined limits of movement, the relative movement is limited in both the vertical and in the horizontal direction by stops 7, 8. In the three exemplary embodiments shown, these relative movements in the horizontal and vertical directions are made possible by two oblong holes 9, 10. It is how particularly well in the exploded view of Fig. 2 to recognize, in the embodiments, a substantially vertically extending slot 9 in the support housing 17 and a substantially horizontally extending slot 10 in the seat plate 11 is provided. Passed through both slots 9, 10 is the shaft 11, which rests in the region of the free end 5 of the spiral spring 4 on this. The limitation of the horizontal as well as the vertical movement is given by the respective ends or stops 7, 8 of the slots 9, 10. In all the exemplary embodiments shown, the desired relative movement with horizontal as well as vertical component is realized by a pairing of substantially vertically and substantially horizontally extending slot. The term essentially refers to a maximum deviation from the vertical or horizontal of 10 to 15%. The desired relative movement with a horizontal and vertical component can also be realized by arranged at different angles slots, as long as the angle between the two slots in which the shaft 11 is slidably mounted, deviates from 0 °.

It also does not necessarily have to be provided oblong holes to limit. Also trained attacks and sliding surfaces or guides are possible.

A person sits down on the previously unloaded chair according to Fig. 1 , so the bending spring 4 is biased by her free end 5 is pressed by the shaft 11 a piece down. How far depends on the weight of the person sitting on the seat plate 1. Leaning this person then to the backrest 2, the support arm 3 is pivoted in the direction 25 against the spring force of the further elastically deflecting spiral spring 4. In this case, the seat plate pivot axis 14 and thus the entire seat plate 1 is pulled backwards. This movement possibility is given by the horizontal slot 10. Conveniently, when leaning back the front, so facing away from the backrest 2 end of the seat plate 1 is slightly raised in the direction 26 or dwells in height, so that sitting on the seat or seat plate 1 person does not feel forward from the seat to slip. By means of the initially mentioned bias of the spiral spring 4 by moving the shaft 11 in the slot 9, the counterforce generated by the spiral spring 4 when pivoting the backrest 2 in the direction 25 on the weight and the leverage of the person sitting on the chair person dependent. In this way, a weight compensation is thus achieved. An additional adjustment possibility can be provided by an eccentric design of the shaft 11 with a corresponding handle for rotating the shaft 11. However, this is not explicitly shown in the exemplary embodiments shown. Fig. 4 shows the chair according to Fig. 1 in a deflected position with tensioned spiral spring 4, in which a person, not shown, is leaning against the backrest 2. The geometry of the pivot points, the properties of the spiral spring 4 and the stops 7, 8 are favorably designed so that the transmission ratio between the tilting movement of the backrest 2 and the tilting movement of the seat plate 1 is approximately 3: 1. For the seat plate 1 is preferably a maximum deflection angle of 8 °, provided for the backrest 2, a maximum deflection angle of 24 °. This also applies to the embodiments according to the Fig. 5 and 6 ,

In Fig. 5 extends the spiral spring 4 below the seat plate 1 not only to the carrier housing pivot axis 15, but up to the front pivot point 28 of the connecting web 27 of the seat plate pivot axis 14 with the support arm 3. The length of the spiral spring 4 is illustrated by the bracket 23. The elastic properties of the bending spring 4 can be adjusted in relation to those of the support arm 3 again by material composition and / or cross-sectional area. Also in this embodiment, carrier arm 3 and 4 spiral spring are made in one piece. Except for the differences mentioned, the remaining structure of the chair corresponds to that of the embodiment according to the Fig. 1 to 4 ,

Fig. 6 shows an inventive embodiment in the form of a swivel chair, in which the bending spring 4 and the support arm 3 are initially designed as separate components. The spiral spring 4 is present here in the form of a leaf spring 13. This is attached via the connection 12 on the support arm 3. Preferred forms of the compound 12 are designed to be detachable. This can be z. B. by screwing or riveting the case. In this variant, any materials for the support arm 3 can be used. These may be the plastics mentioned above, but also metals or other materials. The leaf spring 13 may, for. B. be made of metal or plastic. The remaining construction of the swivel chair according to Fig. 6 corresponds to the embodiments according to the Fig. 1 to 5 ,

Although not immediately apparent in the figures shown, it may nevertheless be provided that more than one support arm 3 and more than one bending spring 4 are provided. Conveniently, it may be substantially parallel to each other extending support arms 3 and / or bending springs 4, it is provided in the embodiments shown that two substantially mutually parallel support arms 3 and bending springs 4 are guided past the right and left of the support housing 17. The two support arms 3 are connected to each other in the region of the backrest 2. However, this is not a limitation of the invention. The number of support arms 3 and bending springs 4 can be selected according to design standards and wishes.

If it is desired to dispense with the above-mentioned weight adjustment in a simplified form, it is also possible to dispense with the vertically displacing component of the relative movement between the seat plate 1 and the spiral spring 4 and thus the slot 9 in deviation from the exemplary embodiments shown.

Legend for the reference numbers:

1

seat plate

2

backrest

3

support arm

4

bending spring

5

free end

6

Storage facility

7

vertical stop

8th

horizontal stroke

9

Long hole

10

Long hole

11

wave

12

connection

13

leaf spring

14

Seat plate swivel axis

15

Support housing pivot axis

16

undercarriage

17

support housing

18

pillar

19

stand

20

role

21

core area

22

cladding region

23

clip

24

vertical axis

25

direction

26

direction

27

connecting web

28

articulation

Claims (15)

Seating furniture with support (16), a seat plate (1) and a backrest (2) arranged on at least one support arm (3) pivotable relative to the support (16), the seat plate (1) being connected to at least one of the support arms (3) elongated bending spring (4) is supported and the spiral spring (4) is arranged so that it is elastically deflected under load of the seat plate (1) transversely to its longitudinal extent, characterized in that the bending spring (4) on the support arm (3) rotatably is fixed. Seating furniture according to claim 1, characterized in that the spiral spring (4) has a free end (5), in the region of which the seat plate (1) is supported on the spiral spring (4). Seating furniture according to one of claims 1 or 2, characterized in that the bending spring (4), preferably in the region of its free end (5), the seat plate (1) via a bearing device (6) is supported, wherein the bearing means (6) has a relative movement allows against the spring force of the spiral spring (4) between the seat plate (1) and the support with a vertical component in the operating position of the chair. Seating furniture according to claim 3, characterized in that the bearing device (6) permits a relative movement with a horizontal component in the operating position of the seat Seating furniture according to claim 3 or 4, characterized in that the bearing means (6) for enabling the relative movement at least one elongated hole (9), preferably two at an angle deviating from 0 ° to each other arranged slots (9, 10). Seating furniture according to claim 5, characterized in that a shaft (11) in each slot (9,10) is displaceably mounted in the direction of a component of the relative movement, which shaft (11) in the region of the free end (5) of the spiral spring (4 ) is supported on this. Seating furniture according to claim 6, characterized in that the shaft (11) is equipped with an eccentric which is rotatable against or together with the shaft, and the eccentric in the region of the free end (5) of the spiral spring (4) supported on this. Seating furniture according to one of claims 1 to 7, characterized in that the bending spring (4) has a smaller cross-section and / or a different material composition than the support arm (3). Seating furniture according to one of claims 1 to 8, characterized in that the support arm (3) and the spiral spring (4) are designed as separate components, which are interconnected in a connecting region by a, preferably releasable, connection (12). Seating furniture according to claim 8 or 9, characterized in that the bending spring (4) is a leaf spring (13) or a leaf spring package. Seating furniture according to one of claims 1 to 10, characterized in that the support arm (3) and the spiral spring (4) together on the seat plate (1), preferably on the underside of the seat plate (1), via at least one in the operating position of the chair in Essentially horizontal seat plate pivot axis (14) are pivotally articulated. Seating furniture according to claim 11, characterized in that the seat plate pivot axis (14) is rotatably arranged on the seat plate (1) and the support arm (3) and fixed to the seat plate (1) and / or the support arm (3). Seating furniture according to one of claims 1 to 12, characterized in that the support arm (3) and the spiral spring (4) are pivotally connected together via a in the operating position of the seat substantially horizontal carrier housing pivot axis (15) on the support (16). Seating furniture according to one of claims 1 to 13, characterized in that the support arm (3) is formed at least partially in pairs and rotationally fixed fixed bending springs (4). Seating furniture according to one of claims 1 to 14, characterized in that it is a chair with about a vertical axis (24) rotatable seat plate (1).

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