EP3295830B1 - Chair with a connection assembly, method for producing a connecting assembly - Google Patents

Description

FIELD OF THE INVENTION

The present invention relates to a connection arrangement for or in a chair, in particular conference or office chair, a method for producing such a connection arrangement and a chair with such a connection arrangement.

TECHNICAL BACKGROUND

Although the present invention, as well as its underlying problem is described below in relation to office swivel chairs closer, it is not limited thereto, but on a variety of chairs, especially conference or office chairs, transferable.

Office swivel chairs usually have a swivel mechanism and an armrest. There are a variety of configurations of swivel mechanisms, armrests and their connection. An armrest carrier is typically attached to a seat carrier. Such a chair and such an armrest carrier are for example in the DE 10 2008 042 974 B3 described.

In addition, there are also versions of an office swivel chair with swivel mechanism in which an armrest support is hinged to a backrest support. Such an office swivel chair is for example in the US 2002/0149247 A1 described.

The documents US 2003/164638 A1 and US 4,586,750 A disclose office swivel chairs according to the prior art.

The disadvantage of such articulation is designed with a variety of items, which makes installation difficult. In addition, the linkage is largely visible from the outside, which is disadvantageous in design aspects.

In addition, the base and handlebars of a swivel mechanism of this office swivel chair are designed to be relatively solid and have a return spring integrated in the swivel mechanism. Overall, therefore, a relatively large space is needed. Furthermore, the entire structure of such office swivel chair is very massive, which increases the weight and is particularly disadvantageous in design aspects.

SUMMARY OF THE INVENTION

Against this background, the present invention seeks to provide an improved connection arrangement for a chair.

According to the invention, this object is achieved by a connection arrangement having the features of patent claim 1 and / or by a method having the features of patent claim 10 and / or a chair having the features of patent claim 12.

The idea underlying the present invention is to rotatably couple an armrest carrier to a backrest support by means of a bearing pin fixed in the armrest carrier.

Advantageously in this way a rotatable articulation and thus the possibility of integration into a predetermined movement of a chair, for example, a synchronous movement created.

The rotatable linkage comes with a minimum of individual parts. Thus, the connection assembly according to the invention is very easy and inexpensive to assemble. In addition, can be transmitted via the connection arrangement advantageous Rücklehnkräfte. This opens up the possibility of using the armrest carrier as a force storage element of a pivoting mechanism of the chair.

Particularly advantageously, the bearing pin can also be fixed in such a way in the armrest carrier, in particular on a side facing the backrest support, that it is invisible from the outside. For example, it can be admitted to the production on the backrest support side facing or partially sunk in a blind hole.

In addition, the connection arrangement according to the invention has a particularly small installation space. In particular, according to the invention, the bearing pin can be fixed in a narrow cross-section of the armrest carrier. For example, a height of the cross section may be less than five times a core diameter of the bearing pin. In this way, a particularly slim design of a armrest carrier is possible.

The fixation of the bearing pin preferably comprises a determination of all degrees of freedom relative to the armrest carrier. In particular, the bearing pin is rotationally fixed in the armrest carrier. For example, it can be molded, screwed in with a pre-tensioning and / or firmly bonded. In this way, a reliable power transmission of the reclining forces on the armrest carrier with high strength of the connection is advantageously possible.

In a chair provided with the connection arrangement, a backrest frame attached to the backrest support is preferably provided, which has a recess and is pushed onto the backrest support in the region of the recess. In this way, the region of the rotatably mounted in the backrest support bearing pin, in particular completely, are covered by the backrest frame, so that the connection is particularly advantageous from the outside invisible design aspects.

Advantageous embodiments and further developments will become apparent from the other dependent claims and from the description with reference to the figures of the drawing.

According to a preferred embodiment, the armrest carrier has a bore into which the bearing pin is screwed. Particularly preferably, this is a blind hole, which is advantageously not visible from the outside under design aspects. Thus, an aesthetic and easy-to-manufacture fixation is created.

According to a further development, the bearing pin has a self-holding thread designed and a paragraph, wherein the thread in the bore and the shoulder is biased non-positively on a shoulder or shoulder of the bore. Advantageously, unwanted loosening of the fixation is avoided in this way. In particular, no further securing means are necessary for this purpose. Furthermore, a high strength of the connection or fixation is provided in this way. The self-retaining thread holds in particular without an internal thread of the bore in the material of the armrest carrier without cutting it.

According to a particularly preferred embodiment, the material of the armrest support in the region of the thread is completely unseparated. In particular, the material is not cut. In one embodiment, the bore is unthreaded in the initial state. A bore diameter is significantly larger than the core diameter of the thread, in particular by at least 5%, preferably by 8% to 10%. In this way, a release-free molding of the thread is made possible in the bore, wherein the material of the armrest carrier, which is preferably a plastic-containing material, not separated or cut but only is deformed. The larger diameter of the bore creates space for evading the material of the armrest carrier. Thus, the material is merely displaced. Particularly advantageous in this way no crack approaches in the material of the armrest support available. Rather, material connections remain crack-free.

According to one embodiment, the thread has a pitch per thread, which is at least half of its core diameter. Gradients of, for example, between 2.5 mm and 4.5 mm, in particular between 3 mm and 4 mm, with a core diameter of, for example, 5 mm to 8 mm, in particular 6 mm to 7 mm, are preferred. With this very high thread pitch a traction is achieved despite low deformation of the material of the armrest carrier when screwing or forming the thread.

According to one embodiment, the thread in the profile has a rounded tip with a width smaller than 5% of the core diameter, in particular smaller than 3% of the core diameter. For example, with a core diameter of 6.4 mm, the width of the tip is less than 0.2 mm. Due to the small width of the tip combined with its rounding a cutting into the material of the armrest carrier is avoided.

According to a preferred embodiment, the armrest carrier comprises a plastic material, in particular polyamide, preferably with glass fiber content. Particularly preferred glass fiber reinforced polyamide 6 is used with 30% glass fiber content (PA 6 GF30). In particular, the material of the armrest carrier and a thread shape of the thread of the bearing pin are matched to one another such that the material is deformed undivided in the region of the thread. Nevertheless, such a material has a high strength on. Furthermore, it has an E-module, which qualifies him as a construction material for a very slim formable power storage element. For example, the modulus of polyamide with glass fiber content in the range of 6000 to 10,000 MPa.

Advantageously, the plastic material for molding the armrest support provides a great deal of freedom in shaping. In addition, a production of large quantities is easy to represent, for example by injection molding. Further preferably, the plastic material is colored through. Overall, therefore, after a prototype hardly or only minor reworking necessary.

Preferably, the armrest support is provided with such a plastic material with a narrow cross-section, the height of which is in particular less than five times a core diameter of the bearing pin. Thus, a particularly slim design is possible.

According to one embodiment, the backrest support comprises a rigid material. In particular, this may be a metal, preferably aluminum die-cast. In this way, the rotatable mounting of the bearing pin in the backrest support is made possible with little space.

The backrest support has a receiving portion with a first bearing bush for rotatably receiving a bearing portion of the bearing pin. In this way, a defined rotatable mounting of the bearing pin is provided.

The first bushing receives a first stage of the bearing section. Furthermore, a second bearing bush is provided, which is a second Stage of the bearing section absorbs. In this way, the rotatable bearing with a very high strength and suitable for transmitting large forces. The provision of the bushings also advantageously reduces noise during movement of the connection assembly. In particular, the power support via the first and two bushings is also suitable for supporting larger moments. The strength can be further increased by reinforcing ribs in the material of the backrest support, in particular aluminum die-cast, for load absorption. In this way, advantageously, the armrest carrier can be designed as a force storage and / or power transmission element and / or are under a bias.

According to a development, the first bushing has a smaller diameter than the second bushing. For example, a diameter of the second bushing is a quarter to a half, in particular by a third, larger. In this way, the bearing pin is much easier to insert into the receiving portion, which facilitates assembly.

According to one embodiment, the bearing portion is fixed by means of a provided in the first stage first securing means, in particular a mountable securing means, and adjacent to the second stage second securing means, in particular a paragraph, rotatably about the pin axis in the bearing bushes. In this way, the rotatable mounting is advantageously secured.

According to one embodiment, the bearing pin has a torque transmission section which is arranged between the thread and the bearing section and which provides a tool attachment designed to transmit a torque which screwed the thread into the bore in a force-fitting manner is. In this way, easy assembly is advantageously ensured.

According to one embodiment of the method for producing a connection arrangement, a thread of the bearing pin is screwed into a provided in the material of the armrest support thread-free bore for fixing, the screwing by separation-free molding at a slow speed, in particular less than one revolution per second is made. For this purpose, the bore preferably has a diameter which is significantly larger, in particular at least 5% larger, preferably 8 to 10% larger, than the core diameter of the thread. The material of the armrest support, preferably a plastic material, so can dodge in the slow screwing, so that it can be deformed without separation.

According to one embodiment of the chair, the seat carrier is coupled to the backrest support via a translation, which allows a pivoting of the backrest support and the seat support with a predetermined movement. The armrest carrier is designed as a force storage element and provides a restoring force for the predetermined movement. The armrest support is tensioned upon application of a reclining force and resulting rearward pivoting of the seatback support and the seat support, and returns the seatback support and seat support to an upright position when the recline is removed.

In one embodiment, the armrest carrier is designed as a tensile and / or bending energy storage element.

The above embodiments and developments can, if appropriate, combine with each other as desired. Especially the features of a connection arrangement are transferable to a method for producing such a connection arrangement, and vice versa.

Further possible refinements, developments and implementations of the invention also include combinations, not explicitly mentioned, of features of the invention described above or below with regard to the exemplary embodiments. In particular, the person skilled in the art will also add individual aspects as improvements or additions to the respective basic form of the present invention.

CONTENT OF THE DRAWING

Fig. 1

eine horizontale Längsschnittansicht eines Stuhls mit einer Verbindungsanordnung;

Fig. 2

einen vergrößerten Ausschnitt der Längsschnittansicht gemäß Fig. 1 im Bereich der Verbindungsanordnung;

Fig. 3

eine Querschnittansicht eines Gewindes eines Lagerbolzens;

Fig. 4

eine Vorderansicht eines Lagerbolzens;

Fig. 5A

eine schematische Skizze der Kinematik eines Stuhls in einer aufrechten Position;

Fig. 5B

die Skizze der Kinematik eines Stuhls gemäß Fig. 5A in einer nach hinten verschwenkten Position;

Fig. 6

eine schematische Skizze der Kinematik eines Stuhls gemäß einer weiteren Ausführungsform;

Fig. 7A

eine Seitenansicht eines Stuhls in einer aufrechten Position;

Fig. 7B

eine Seitenansicht des Stuhls gemäß Fig. 7A in einer nach hinten verschwenkten Position;

Fig. 8

eine Längsschnittansicht eines Stuhls.

The present invention will be explained in more detail with reference to the exemplary embodiments indicated in the schematic figures of the drawing. It shows:

Fig. 1

a horizontal longitudinal sectional view of a chair with a connection arrangement;

Fig. 2

an enlarged section of the longitudinal sectional view according to Fig. 1 in the field of connection arrangement;

Fig. 3

a cross-sectional view of a thread of a bearing pin;

Fig. 4

a front view of a bearing pin;

Fig. 5A

a schematic sketch of the kinematics of a chair in an upright position;

Fig. 5B

the sketch of the kinematics of a chair according to Fig. 5A in a pivoted backward position;

Fig. 6

a schematic sketch of the kinematics of a chair according to another embodiment;

Fig. 7A

a side view of a chair in an upright position;

Fig. 7B

a side view of the chair according to Fig. 7A in a pivoted backward position;

Fig. 8

a longitudinal sectional view of a chair.

The accompanying figures of the drawing are intended to convey a further understanding of the embodiments of the invention. They illustrate embodiments and, together with the description, serve to explain principles and concepts of the invention. Other embodiments and many of the stated advantages will become apparent with reference to the drawings. The elements of the drawings are not necessarily shown to scale to each other.

In the figures of the drawing are the same, functionally identical and same-acting elements, features and components - unless otherwise stated - each provided with the same reference numerals.

DESCRIPTION OF EMBODIMENTS

Fig. 1 shows a horizontal longitudinal sectional view of a chair 1 with a connection assembly 30. The perspective shown shows the chair 1 from above.

The connection arrangement 30 has a armrest support 4, a backrest support 3 and a bearing pin 31. The bearing pin 31 is fixed in the armrest support 4 and rotatably coupled to the backrest support 3.

Other features of the chair are related to the FIGS. 5 to 8 described in more detail.

Fig. 2 shows an enlarged section of the longitudinal sectional view according to Fig. 1 in the region of the connection arrangement 30.

Visible, the bearing pin 31 has a thread 33 and a bearing portion 43. By means of the thread 33 of the bearing pin 31 is fixed in the armrest carrier 4. For this purpose, a bore 32 is provided in the form of a blind hole in the armrest carrier 4, in which the bearing pin 31 is screwed.

The thread 33 is designed to be self-holding, wherein the bearing pin 31 further comprises a thread 33 adjacent to the shoulder 34. By means of self-holding thread 33 and the shoulder 34 of the bearing pin 31 is biased frictionally in the bore 32, wherein the shoulder 34 of the bearing pin is supported on a shoulder 35 of the bore 32.

The material of the armrest carrier 4 is completely unseparated in the region of the thread 33. This is achieved on the one hand by a special thread form and on the other hand, that the bore 32 is thread-free in the initial state and a bore diameter is significantly larger than the core diameter of the thread.

For example, in one embodiment, the bore diameter is 7 mm, while a core diameter of the thread is 6.4 mm.

In the manufacture of the connection assembly 30, the thread 33 is screwed in by a slow-release, parting-free molding, wherein a screwing speed is less than one revolution per second. The material of the armrest carrier, which is exemplified here polyamide 6 with 30% glass fiber content (PA 6 GF30) is not separated or cut but only deformed or displaced. The larger diameter of the bore creates enough space to dodge the material.

The bearing portion 43 is rotatably mounted in a receiving portion 40 of the backrest support 3. For this purpose, it is accommodated in a first bushing 41 and in a second bushing 42, which are arranged in a recess of the backrest support 3 formed from die-cast aluminum.

The bushes 41, 42 are designed as plain bearings and have different diameters, wherein a diameter of the second bushing 42 is larger than a diameter of the first bushing 41 is provided.

By way of example, a diameter of the first bushing may be 6 mm and a diameter of the second bushing 8 mm.

The bearing pin 31 is secured in the bushings 41, 42 by a first securing means 46 in the form of a locking ring mounted in a groove of the bearing pin 31 adjacent to the first bushing 41 and a second securing means 47 in the form of one on the bearing pin adjacent to the second bushing 42 Provided for in paragraph 31.

An attached to the backrest support 3 backrest frame 16 has a recess 53 and is pushed in the region of the recess 53 on the receiving section 40 of the backrest support 3. In addition, there is between the backrest frame 16 and the armrest support 4 only a small gap 54, so that the receiving portion 40 and the bearing pin 31 are almost completely concealed by the backrest frame 16 and the armrest support 4 invisible from the outside.

Fig. 3 shows a cross-sectional view of a thread 33 of a bearing pin 31st

The thread 33 has a core diameter 37 and a slope 36. The pitch 36 is greater in magnitude than half of the core diameter 37. For example, a core diameter 37 can be 6.4 mm, while a pitch is 3.5 mm.

The profile of the thread 33 has a rounded tip 38. A width 39 of the tip 38 amounts to less than 3% of the core diameter 37, by way of example 0.17 mm.

A flank height 51 of the profile is comparatively large and is in particular more than five times, preferably more than seven times, the width 39 of the tip 38 or more than one fifth of the core diameter 37, for example 1.2 mm.

An overall diameter 52 of the thread 33 is thus greater than the core diameter 37 by more than one-third and is for example 8.8 mm.

Fig. 4 shows a front view of a bearing pin.

The bearing pin 31 has, in the region of the bearing section 43, a first step 44 and a second step 45, which also differ according to the different diameters of the bushes 41, 42. Accordingly, the first stage 44 exemplifies a diameter of 6 mm and the second stage 45 by way of example a diameter of 8 mm.

Between the thread 33 and the bearing portion 43, more precisely between the shoulder 34 and the shoulder 47, a torque transmission portion 49 is provided. This has a tool attachment 50, by means of which a tool torque on the bearing pin 31 is transferable, so that it can be screwed in a simple manner with the thread 33.

Fig. 5A shows a schematic sketch of the kinematics of a chair 1 in an upright position. The kinematics will be explained below with reference to this sketch.

The chair 1 has a seat carrier 2 shown schematically and a backrest support 3, shown schematically, which are coupled via a transmission 5.

The translation 5 determines a movement of the seat support 2 and the backrest support 3 in a pivoting from the upright position shown here in a pivoted backward position.

In addition, the seat support 2 and the backrest support 3 are coupled via a trained as a force storage element armrest support 4. The armrest support 4 is designed and arranged such that it allows the predetermined by the translation sequence of movement of the seat support 2 and the backrest support 3. In addition, the armrest support 4 provides a force returning to the upright position.

The force returning to the upright position is provided throughout the movement. Especially the armrest carrier is stretched to the rear with increasing pivoting.

Furthermore, a bias voltage of the armrest carrier 4 may be provided, so that a restoring force is applied even in the upright position. In particular, a stop, not shown here, is provided in this case, on which the bias is supported in the upright position.

For pivoting the seat support and the backrest support from the upright position in the pivoted backward position, therefore, an external against the bias or against the restoring force working recline force must be applied.

Fig. 5B shows the sketch of the kinematics of a chair 1 according to Fig. 5A in a pivoted backward position.

In the pivoted to the rear position of the armrest carrier 4 formed as a force storage element is elastically deformed or stretched and thus stores an applied in the rear pivoting and clamping work or energy. This causes in a state free of external forces, in particular without recline, a force returning to the upright position.

The translation 5 is coupled to a seat base 8. A first pivot point 9 and a second pivot point 10 of the transmission 5 are fixedly arranged on the seat base. In addition, a firmly arranged on the seat support 2 third pivot point 11 and another fixed to the seat support 2 fourth pivot point 12 are provided.

The first pivot point 9 is coupled to the fourth pivot point 12 via a first link 13, which is fixed to the backrest support 3 is connected or integrally formed therewith. The first link 13 thus represents kinematically a part or an extension of the backrest support 3.

A second link 14 couples the second pivot 10 to the third pivot point 11. The first link 13, the seat base 8, the second link 14 and the seat carrier 2 thus jointly close a kinematic quadrangle with the first to fourth pivot points 9 to 12 as corners.

The first link 13 and the second link 14 are in both the upright position according to FIG Fig. 5A as well as in the rearward pivoted position according to Fig. 5B inclined in a same direction, which represents a direction away from the backrest support 3 direction. The second link 14 is always slightly more inclined than the first link 13. For both links a vertical inclination in the upright position is greater than in the pivoted backward position. Thus, the third and fourth pivot point 11, 12 and thus the seat support 2 lift in the rear pivoting.

The fourth pivot point 12 is arranged in a rear region 18 of the seat carrier 2 and the third pivot point 11 in a front region 17 of the seat carrier 2. Furthermore, the second link 14 is formed longer than the first link 13 in addition to its greater inclination. Therefore, in the rearward pivoting, the front portion 17 of the seat support 2 rises more than the rear portion 18, so that the seat support 2 is pivoted.

The trained as a force storage element armrest carrier 4 is rotatably coupled to the seat support 2 at a first end 6.

At a second end 7 of the armrest carrier 7 is rotatably coupled to the backrest support 3. Accordingly, a fifth pivot point 19 is provided, via which the armrest carrier 4 is rotatably coupled to the backrest support 3.

This fifth pivot point 19 can be realized with a connection arrangement 30. The connection arrangement 30 thus fulfills the task of a pivot point in the kinematics of the pivotable and chair 1.

The fifth pivot point 19 or the connecting arrangement 30 advantageously allows a mixture of tensile or compressive and bending stress of the armrest carrier 4 in the event of a rearward pivoting. The pivoting changes a distance of the fifth pivot point 19 from the rotatably coupled to the seat support 2 first end 6, so that a tensile or compressive force is applied. In addition, when pivoting the fifth pivot point 19 is displaced relative to the first end such that a force component is added transversely to the pure tensile or compressive load and the armrest carrier is thus loaded with a bending force, which on the rotationally fixed to the seat support. 2 coupled first end 6 causes a bending moment.

These loads are transmitted by means of the connection arrangement 30 between the armrest support and the backrest support.

Fig. 6 shows a schematic sketch of the kinematics of a chair according to another embodiment.

A seat base 8 is symbolized here only at the first and second fulcrum 9, 10 marked fixed bearings.

The predetermined movement of the translation 5 depends in particular on the arrangement of the pivot points 9, 10, 11, 12 from. In the illustrated embodiment, a distance between the second pivot point 10 and the third pivot point 11, which is formed by the second link 14, approximately the same size as a distance between the fourth pivot point 12 and the third pivot point 11, which is formed by the seat support 2 is. A distance between the first pivot point 9 and the fourth pivot point 12, which is formed by the first link 13, is significantly smaller, and in particular is only a fraction of it. A distance between the first pivot point 9 and the second pivot point 10, which is formed by the seat base 8, lies between these distances.

An angle between a transverse element of the backrest support 3 and the first link 13 is fixed and is preferably between 90 and 180 °, in this example between 125 ° and 130 °. In this way, the side facing away from the backrest support 3 inclination of the first link 13 is achieved.

Fig. 7A shows a side view of a chair in an upright position.

The chair 1 is here exemplified in the form of a conference swivel chair, which kinematics according to Fig. 6 having.

The chair 1 has a seat surface 20, which is formed with a seat cushion 2 mounted on the seat support 2. Further, a backrest 22 is provided, which with a seat back frame attached to the backrest support 3 16 and attached thereto backrest pad 23 is formed.

The backrest frame 16 is pushed with its recess 53 on the receiving portion 40 of the backrest support 3 and thus covers the receiving portion, as in Fig. 2 shown.

The seat base 8 is coupled to a height-adjustable compression spring portion 25, which is mounted on a roller-free stand 24, which is designed as a swivel base.

Further, an armrest 26 is provided which is formed with the armrest support 4 and an armrest pad 27 attached thereto.

The armrest support 4 is made entirely of glass fiber reinforced polyamide and formed with a curved shape which encloses an angle of about 290 °.

With its first end 6 of the armrest support 4 is screwed against rotation on the underside of the seat support 2. The second end 7 of the armrest support 4 is rotatably mounted on the backrest support 3 as part of a connection arrangement 30, as with respect to Figure 1 to 4 described.

The individual elements of the transmission 5 are partially concealed here as well, in particular the second and third pivot points 10, 11. The first link 13, which is partially formed integrally with the backrest support 3, and the second link 14 are clearly visible from the outside.

Fig. 7B shows a side view of the chair according to Fig. 7A in a pivoted backward position.

The backrest 22 is here pivoted visibly backwards. By way of example, this is a pivoting angle in relation to the upright position of 21 °. To the same extent, the first link 13 is pivoted together with the backrest support 3.

Due to the inclination of the first link 13 and the seat carrier 2 and the second link 14 is pivoted, but to a much lesser extent than the first link 13th

Both links 13 and 14 are in both the upright position according to Fig. 7A as well as in the rearward pivot position according to Fig. 7B tilted forward so that a weight of a person sitting on the chair causes a restoring moment and designed as a force storage element armrest support 4 thus only has to work against the recline.

The seat 20 is slightly raised overall and additionally also pivoted, but in comparison to the backrest 22 to a much lesser extent. By way of example, this is a pivoting angle of 7 °.

The armrest carrier 4 is loaded in the illustrated tensioned state both pressure and bending and thus elastically compressed and bent. The corresponding forces are transmitted via the connection arrangement 30 between the armrest carrier 4 and the backrest carrier 3.

The pivoted-back position is achieved by a person sitting on the chair 1 person leaning backwards and thus applying a reclining force on the backrest 22, which overcomes a spring force of the armrest support 4.

The backrest 22 may be opposite the in Fig. 3B shown pivoted backward position by elastic deformation of the backrest support 3 and the backrest frame 16 are further pivoted to the rear, for example, about another 7 °. A total possible swivel angle is thus about 28 °.

In this case, the armrest support 4 is additionally tensioned so that additional forces are transmitted via the connection arrangement 30.

Despite the large swivel range all visible components of the chair 1, in particular the backrest support 3, the first arm 13, the seat base 8 and the second arm 14 and the seat support 2, are very slim. The same applies in particular to the armrest carrier 4, which has a narrow cross section. A height of the cross section is in particular smaller than a five times a core diameter of the bearing pin 31.

In addition, no further components between the seat support 2 and the seat base 8 or between the seat support 2 and the backrest support 3 are arranged. In this way, a tremendously slim design of the chair 1 is created overall, without losing functionality compared to a conventional synchronous mechanism.

Fig. 8 shows a longitudinal sectional view of a chair. 1

This is in contrast to the embodiment according to Figs. 7A and B to an office swivel chair, which is in particular the different design of the base 24 'with rollers 28 and its much higher connection to the compression spring portion 25 is to make out. Incidentally, is the office swivel chair according to Fig. 8 essentially the same as the conference swivel chair Figs. 7A and 7B educated.

The office swivel chair is shown here in the upright position. Pivoting in the rearwardly pivoted position is the same as with respect to Fig. 7B described possible.

In the sectional view well recognizable are the seat cushion 21 and the backrest cushion 23. In addition, it can be seen well with a fastening means 29 in the form of a screw fastening the seat back frame 16 to the backrest support. 3

Further, in the section a pivotal region of the seat support 2 and backrest support 3 in the upright position limiting stop 15 can be seen. This is provided in the region of the third pivot point 11 in the form of a stop wedge, which is supported in the upright position on the second link 14 and in the rearward pivoted position on the seat carrier 2. Preferably, another stop 15 is provided in a similar manner at the fourth pivot point 12, which is hidden here.

The stop 15 is arranged and designed in such a way that upon reaching the stop 15, a pretension of the armrest carrier 4 holding the backrest support 3 and the seat support 2 in the upright position is still present. In this way, a defined position of the translation 5, the seat support 2 and the backrest support 3 is guaranteed even in the upright position.

Although the present invention has been fully described above with reference to preferred embodiments, is they are not limited to that, but modifiable in a variety of ways.

For example, the armrest support 4 need not be formed as shown. It would also be conceivable, for example, to design the armrest carrier kinematically as a pure tension spring and / or to attach an armrest body projecting therefrom, for example, from it. In this case, if necessary, both ends of the armrest support 4 could be rotatably coupled to the backrest support 3 and the seat support 2, respectively.

It would also be conceivable, the chair not as a swivel chair but as a three- or four-legged chair form. In this case, the seat base 8 is provided with corresponding chair legs.

LIST OF REFERENCE NUMBERS

1

chair

2

seat support

3

Backrest support

4

armrest support

5

translation

6

first end

7

second end

8th

seat base

9

first fulcrum

10

second pivot

11

third pivot

12

fourth pivot

13

first handlebar

14

second handlebar

15

attack

16

Backrest frame

17

front end

18

rear end

19

fifth pivot

20

seat

21

seat cushion

22

backrest

23

Backrest cushion

24

stand

25

Compression spring portion

26

armrest

27

armrest pad

28

role

29

fastener

30

joint assembly

31

bearing bolt

32

drilling

33

thread

34

paragraph

35

paragraph

36

pitch

37

core diameter

38

top

39

width

40

receiving portion

41

first bearing bush

42

second bearing bush

43

bearing section

44

first stage

45

second step

46

first securing means

47

second securing means

48

pin axis

49

Torque transmission portion

50

tool attachment

51

flank height

52

diameter

53

recess

54

gap

Claims (13)

1. Connecting arrangement (30) for a chair or in a chair (1), in particular a conference chair or office chair, having:

   an armrest carrier (4);

   a backrest carrier (3); and

   a bearing bolt (31) that is fixed in the armrest carrier (4), which rotatably couples the armrest carrier (4) to the backrest carrier (3), wherein the backrest carrier (3) comprises a receiving section (40) having a first bearing bush (41) for rotatably receiving a bearing section (43) of the bearing bolt (31), wherein the first bearing bush (41) receives a first stage (44) of the bearing section (43) and a second bearing bush (42) is provided, which receives a second stage (45) of the bearing section (43).
2. Connecting arrangement according to claim 1,
   characterised in that
   the armrest carrier (4) comprises a hole (32), in particular a blind hole, into which the bearing bolt (31) is screwed.
3. Connecting arrangement according to claim 2,
   characterised in that
   the bearing bolt (31) comprises a thread (33) that is designed to be self-retaining and a shoulder (34), wherein the thread (33) is pre-stressed in a non-positive locking manner in the hole (32) and the shoulder (34) is pre-stressed on a lip or shoulder (35) of the hole (32).
4. Connecting arrangement according to claim 3,
   characterised in that
   the material of the armrest (4) is entirely unseparatedly deformed in the region of the thread (33).
5. Connecting arrangement according to claim 3 or 4,
   characterised in that
   the thread (33) comprises one pitch (36) per revolution, said pitch amounting to at least half of its core diameter (37).
6. Connecting arrangement according to any one of claims 3 to 5,
   characterised in that
   the thread (33) in profile comprises a rounded tip (38) having a width (39) less than 5% of the core diameter (37), in particular less than 3% of the core diameter (37) .
7. Connecting arrangement according to any one of the preceding claims,
   characterised in that
   the armrest carrier (4) comprises a synthetic material, in particular a polyamid, preferably having a fibreglass proportion.
8. Connecting arrangement according to claim 1,
   characterised in that
   the bearing section (43) is rotatably fixed in the bearing bushes (41, 42) by means of a first securing means (46) that is provided in the region of the first stage, in particular by means of a mountable securing means, and by means of a second securing means (47) that adjoins the second stage (45), in particular a shoulder, around the bolt axis (48).
9. Connecting arrangement according to any one of claims 1 or 8,
   characterised in that
   the bearing bolt (31) comprises a torque-transmitting section (49) that is arranged between the thread (33) and the bearing section (43), said torque-transmitting section being provided with a tool attachment (50) that is embodied so as to transmit a torque that screws the thread (33) in a non-positive locking manner into the hole (32).
10. Method for producing a connecting arrangement (30) for a chair or in a chair (1), in particular a connecting arrangement according to any one of the preceding claims, having the steps:

    providing a backrest carrier (3), an armrest carrier (4) and a bearing bolt (31);

    fixing the bearing bolt (31) in the armrest carrier (4); and

    rotatably coupling a bearing section (43) of the bearing bolt (31) to the backrest carrier (3), wherein the backrest carrier (3) comprises a receiving section (40) having a first bearing bush (41) for rotatably receiving a bearing section (43) of the bearing bolt (31), wherein the first bearing bush (41) receives a first stage (44) of the bearing section (43) and a second bearing bush (42) is provided, which receives a second stage (45) of the bearing section (43).
11. Method according to claim 10,
    characterised in that
    a thread (33) of the bearing bolt (31) is screwed into a thread-free hole (32) that is provided in the material of the armrest carrier (4) for fixing purposes, wherein the screwing-in procedure is performed by means of non-separating deformation at slow speed, in particular less than one rotation per second.
12. Chair (1), in particular a conference chair or office chair,
    having a seat carrier (2),
    having a connecting arrangement (30) in accordance with any one of claims 1 to 9 and/or produced using a method in accordance with claim 10 or 11, wherein the armrest carrier (4) is fastened on the seat carrier (2) on an end (6) that is remote from the backrest carrier (3) and the connecting arrangement (30) is provided so as to transmit a backrest force between the backrest carrier (3) and the seat carrier (2).
13. Chair according to claim 12,
    characterised in that
    the seat carrier (2) is coupled to the backrest carrier (3) via a transition (5), which renders it possible for the backrest carrier (3) and the seat carrier (2) to pivot with a predetermined motion sequence, wherein the armrest carrier (4) is embodied as a force storing element and a returning force is provided for the predetermined motion sequence.

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