Connecting arrangement for or in a chair, method for producing a connecting arrangement, chair

Abstract

Connecting arrangement (30) for or in a chair (1), in particular a conference or office chair, comprising: an armrest support (4); a backrest support (3); and a bearing pin (31) fixed in the armrest support (4), which rotatably couples the armrest support (4) to the backrest support (3), wherein the armrest support (4) has a bore (32), in particular a blind bore, into which the bearing pin (31) is screwed and the bearing pin (31) has a self-retaining thread (33) and a shoulder (34), wherein the thread (33) is force-lockingly pre-tensioned in the bore (32) and the shoulder (34) is force-locked on a shoulder or shoulder (35) of the bore (32), wherein the material of the armrest support (4) is completely unseparated in the region of the thread (33).

Description

FIELD OF THE INVENTION

[0001] The present invention relates to a connecting arrangement for or in a chair, in particular a conference or office chair, a method for producing such a connecting arrangement and a chair with such a connecting arrangement. TECHNICAL BACKGROUND

[0002] Although the present invention and the problem underlying it are described in more detail below with reference to office swivel chairs, it is not limited to this, but can be applied to a wide variety of chairs, in particular conference or office chairs.

[0003] Office swivel chairs typically feature a swivel mechanism and an armrest. There are a variety of swivel mechanism designs, armrests, and their connection options.

[0004] An armrest support is typically attached to a seat support. Such a chair and such an armrest support are described, for example, in DE 10 2008 042 974 B3.

[0005] There are also versions of office swivel chairs with swivel mechanisms in which an armrest support is hinged to a backrest support. Such an office swivel chair is described, for example, in US 2002 / 0149247 A1.

[0006] The disadvantage of such a linkage is that it is designed with a multitude of individual parts, which makes assembly difficult. Furthermore, the linkage is largely visible from the outside, which is disadvantageous from a design perspective.

[0007] In addition, the base and handlebars of this office swivel chair's swivel mechanism are relatively solid and feature a return spring integrated into the swivel mechanism. Overall, this requires a relatively large amount of installation space. Furthermore, the entire structure of this office swivel chair is very solid, which increases the weight and is particularly disadvantageous from a design perspective.

[0008] US Pat. No. 5,597,209 A1 discloses an adjustable armrest for a vehicle seat. The armrest is attached to a seat backrest by sliding the armrest over a mounting bolt that extends laterally from the seat backrest. A wire spring clip attached to the armrest sits in a groove in the bolt and holds the armrest axially on the mounting bolt. When installed, the wire spring clip is located at the interface between the armrest and the seat backrest.

[0009] Furthermore, DE 30 16 945 A1 discloses a seat with a backrest provided with a backrest cushion and an associated, subsequently mounted armrest with mounting devices for mounting the armrest on at least one side of the backrest. The mounting device is a substantially U-shaped metal tube with two substantially vertical end sections welded to the side parts of a metal frame of the backrest and with an elongated, horizontal crosspiece connecting the end sections. SUMMARY OF THE INVENTION

[0010] Against this background, the present invention is based on the object of providing an improved connecting arrangement for a chair.

[0011] According to the invention, this object is achieved by a connecting arrangement having the features of patent claim 1 and / or by a method having the features of patent claim 9 and / or a chair having the features of patent claim 11.

[0012] Accordingly, it is provided: - A connecting arrangement for or in a chair, in particular a conference or office chair, with: an armrest support; a backrest support; and a bearing bolt fixed in the armrest support, which bearing bolt rotatably couples the armrest support to the backrest support, wherein the armrest support has a bore, in particular a blind bore, into which the bearing bolt is screwed and the bearing bolt has a self-retaining thread and a shoulder, wherein the thread in the bore and the shoulder are force-lockingly pre-tensioned at a shoulder or shoulder of the bore, wherein the material of the armrest support is completely unseparated in the region of the thread. - A method for producing a connecting arrangement for or in a chair, in particular a connecting arrangement according to the invention, comprising the steps of: providing a backrest support, an armrest support, and a bearing bolt; fixing the bearing bolt in the armrest support, wherein for fixing purposes a thread of the bearing bolt is screwed into a thread-free bore provided in the material of the armrest support, wherein the screwing is carried out by non-separating forming at a slow speed; and rotatably coupling a bearing portion of the bearing bolt to the backrest support. - A chair, in particular a conference or office chair, with a seat support, with a connecting arrangement according to the invention and / or with a connecting arrangement produced by a method according to the invention, wherein the armrest support is fastened to the seat support at an end facing away from the backrest support and the connecting arrangement is provided for transmitting a reclining force between the backrest support and the seat support.

[0013] The idea underlying the present invention is to rotatably couple an armrest support to a backrest support by means of a bearing bolt fixed in the armrest support.

[0014] This advantageously creates a rotatable linkage and thus the possibility of integration into a predetermined movement sequence of a chair, for example a synchronous movement.

[0015] The rotatable linkage requires a minimum of individual parts. Thus, the connection arrangement according to the invention is very simple and cost-effective to assemble.

[0016] Furthermore, the connection arrangement allows for advantageous transfer of reclining forces. This opens up the possibility of using the armrest support as a force storage element for a swivel mechanism of the chair.

[0017] Particularly advantageously, the bearing pin can also be fixed in the armrest support, particularly on a side facing the backrest support, in such a way that it is invisible from the outside. For example, it can be recessed during manufacture on the side facing the backrest support or partially countersunk into a blind hole.

[0018] Furthermore, the connection arrangement according to the invention requires particularly little installation space. In particular, the bearing pin can be fixed into a narrow cross-section of the armrest support. For example, the height of the cross-section can be less than five times the core diameter of the bearing pin. This enables a particularly slim design of the armrest support.

[0019] The fixation of the bearing pin preferably includes defining all degrees of freedom relative to the armrest support. In particular, the bearing pin is fixed in the armrest support in a rotationally fixed manner. For this purpose, it can be molded, screwed in with preload, and / or firmly secured. This advantageously enables reliable transmission of the reclining forces via the armrest support with a high degree of connection strength.

[0020] In a chair equipped with the connecting arrangement, a backrest frame is preferably provided, which is attached to the backrest support and has a recess and is pushed onto the backrest support in the region of the recess. In this way, the area of the bearing pin rotatably mounted in the backrest support can be concealed, in particular completely, by the backrest frame, so that the connection is particularly advantageously invisible from the outside from a design perspective.

[0021] Advantageous embodiments and further developments emerge from the further subclaims and from the description with reference to the figures of the drawing.

[0022] According to the invention, the armrest support has a bore into which the bearing pin is screwed. This bore is particularly preferably a blind hole, which, from a design perspective, is advantageously not visible from the outside. This creates an aesthetically pleasing and easy-to-manufacture fixation.

[0023] According to the invention, the bearing pin has a self-retaining thread and a shoulder, wherein the thread is pre-tensioned in the bore and the shoulder is pre-tensioned at a shoulder or shoulder of the bore. This advantageously prevents accidental loosening of the fixation. In particular, no further securing means are necessary. Furthermore, this ensures a high degree of strength of the connection or fixation. The self-retaining thread holds in the material of the armrest support, in particular without an internal thread of the bore, without cutting it.

[0024] According to the invention, the material of the armrest support is completely unseparated in the area of the thread. In particular, the material is not cut. In one embodiment, the bore is thread-free in its 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%. This enables the thread to be formed into the bore without any separation, whereby the material of the armrest support, which is preferably a material containing plastic, is not severed or cut but merely deformed. The larger diameter of the bore creates space for the material of the armrest support to escape. The material is thus merely displaced. This is particularly advantageous because there are no cracks in the material of the armrest support. Rather, material connections remain crack-free.

[0025] According to one embodiment, the thread has a pitch per thread turn that is at least half of its core diameter. Pitches of, for example, between 2.5 mm and 4.5 mm, in particular between 3 mm and 4 mm, are preferred, with a core diameter of, for example, 5 mm to 8 mm, in particular 6 mm to 7 mm. This very high thread pitch achieves a frictional connection despite minimal deformation of the material of the armrest support during screwing in or forming the thread.

[0026] According to one embodiment, the thread in the profile has a rounded tip with a width less than 5% of the core diameter, in particular less 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. The narrow width of the tip combined with its rounded shape prevents cutting into the material of the armrest support.

[0027] According to a preferred embodiment, the armrest support comprises a plastic material, in particular polyamide, preferably with a glass fiber content. Particular preference is given to using glass fiber-reinforced polyamide 6 with a 30% glass fiber content (PA 6 GF30). In particular, the material of the armrest support and the thread shape of the bearing bolt thread are matched to one another in such a way that the material is deformed in the thread region without separation. Nevertheless, such a material exhibits high strength. Furthermore, it exhibits a modulus of elasticity that qualifies it as a construction material for a very slim energy storage element. For example, the modulus of elasticity of polyamide with a glass fiber content is in the range of 6000 to 10000 MPa.

[0028] The plastic material used to mold the armrest support offers considerable freedom in shaping. Furthermore, large-scale production is easily achieved, for example, through injection molding. Furthermore, the plastic material is preferably colored throughout. Overall, this means that little or only minimal reworking is required after the initial molding.

[0029] 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 the core diameter of the bearing pin. This enables a particularly slim design.

[0030] According to one embodiment, the backrest support comprises a rigid material. In particular, this can be a metal, preferably die-cast aluminum. This allows the rotatable mounting of the bearing pin in the backrest support with minimal installation space.

[0031] According to one embodiment, the backrest support has a receiving portion with a first bearing bush for rotatably receiving a bearing portion of the bearing pin. This provides a defined rotatable mounting of the bearing pin.

[0032] According to an advantageous development, the first bearing bushing accommodates a first step of the bearing section. Furthermore, a second bearing bushing is provided, which accommodates a second step of the bearing section. In this way, the rotatable bearing is very rigid and suitable for transmitting large forces. The provision of the bearing bushings also advantageously reduces noise when the connecting arrangement moves. In particular, the force support via the first and second bearing bushings is also suitable for supporting larger moments. The rigidity can be further increased by reinforcing ribs in the material of the backrest support, in particular die-cast aluminum, for load absorption. In this way, the armrest support can advantageously be designed as a force storage and / or force transmission element and / or can be prestressed.

[0033] According to a further development, the first bushing has a smaller diameter than the second bushing. For example, the diameter of the second bushing is one-quarter to one-half, in particular one-third, larger. This makes it much easier to insert the bearing pin into the receiving section, which simplifies assembly.

[0034] According to one embodiment, the bearing section is secured in the bearing bushes by means of a first securing means, in particular a mountable securing means, provided in the region of the first step, and a second securing means, in particular a shoulder, adjacent to the second step, so that it can rotate about the pin axis. In this way, the rotatable bearing is advantageously secured.

[0035] According to one embodiment, the bearing pin has a torque transmission section arranged between the thread and the bearing section, which is provided with a tool attachment designed to transmit a torque that screws the thread into the bore in a force-locking manner. This advantageously ensures easy assembly.

[0036] According to the method according to the invention for producing a connecting arrangement, a thread of the bearing bolt is screwed into a threadless bore provided in the material of the armrest support for fixing purposes. The screwing in is carried out by non-separating forming at a slow speed, in particular less than one revolution per second. For this purpose, the bore preferably has a diameter that 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, can thus yield during the slow screwing in, so that it can be deformed without separating.

[0037] According to one embodiment of the chair, the seat support is coupled to the backrest support via a transmission mechanism, which allows pivoting of the backrest support and the seat support in a predetermined motion sequence. The armrest support is designed as a force storage element and provides a restoring force for the predetermined motion sequence. The armrest support is tensioned when a reclining force is applied and the backrest support and seat support are subsequently pivoted backward. The armrest support returns the backrest support and seat support to an upright position when the reclining force is removed.

[0038] In one embodiment, the armrest support is designed as a tensile and / or bending force storage element.

[0039] The above embodiments and further developments can be combined with one another as desired, where appropriate. In particular, the features of a connecting arrangement can be transferred to a method for producing such a connecting arrangement, and vice versa.

[0040] Further possible embodiments, refinements, and implementations of the invention also include combinations of features of the invention described above or below with reference to the exemplary embodiments that are not explicitly mentioned. In particular, those skilled in the art will also add individual aspects as improvements or additions to the respective basic form of the present invention. TABLE OF CONTENTS OF THE DRAWING

[0041] The present invention will be explained in more detail below with reference to the exemplary embodiments shown in the schematic figures of the drawing. In the drawings: Fig. 1 is a horizontal longitudinal sectional view of a chair with a connecting arrangement; Fig. 2 an enlarged section of the longitudinal section according to Fig. 1 in the area of the connection arrangement; Fig. 3 a cross-sectional view of a thread of a bearing bolt; 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 rearward pivoted position; Fig. 6 a schematic sketch of the kinematics of a chair according to another embodiment; Fig. 7A is a side view of a chair in an upright position; Fig. 7B a side view of the chair according to Fig. 7A in a rearward pivoted position; Fig. 8 a longitudinal sectional view of a chair.

[0042] The accompanying drawing figures are intended to provide a further understanding of embodiments of the invention. They illustrate embodiments and, in conjunction with the description, serve to explain principles and concepts of the invention. Other embodiments and many of the noted advantages will be apparent upon reference to the drawings. Elements of the drawings are not necessarily shown to scale relative to one another.

[0043] In the figures of the drawing, identical, functionally identical and acting elements, features and components are provided with the same reference symbols, unless otherwise stated. DESCRIPTION OF EMBODIMENTS

[0044] Fig. 1 shows a horizontal longitudinal sectional view of a chair 1 with a connecting arrangement 30. The perspective shown shows the chair 1 from above.

[0045] The connecting assembly 30 comprises an 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.

[0046] Further features of the chair are described with reference to the Fig. 5 to 8 are described in more detail.

[0047] Fig. 2 shows an enlarged section of the longitudinal section according to Fig. 1 in the area of the connecting arrangement 30.

[0048] As can be seen, the bearing pin 31 has a thread 33 and a bearing section 43. The thread 33 secures the bearing pin 31 in the armrest support 4. For this purpose, a bore 32 in the form of a blind hole is provided in the armrest support 4, into which the bearing pin 31 is screwed.

[0049] The thread 33 is designed to be self-retaining, with the bearing pin 31 further comprising a shoulder 34 adjacent to the thread 33. By means of the self-retaining thread 33 and the shoulder 34, the bearing pin 31 is force-locked in the bore 32, with the shoulder 34 of the bearing pin being supported on a shoulder 35 of the bore 32.

[0050] The material of the armrest support 4 is completely uncut in the area of the thread 33. This is achieved, on the one hand, by a special thread shape and, on the other hand, by the fact that the bore 32 is thread-free in its initial state and a bore diameter that is significantly larger than the core diameter of the thread.

[0051] For example, in one embodiment the bore diameter is 7 mm, while the core diameter of the thread is 6.4 mm.

[0052] During the manufacture of the connecting assembly 30, the thread 33 is screwed in at a slow speed by means of a non-separating method, with the screwing speed being less than one revolution per second. The material of the armrest support, which in this case is polyamide 6 with 30% glass fiber content (PA 6 GF30), is not severed or cut, but merely deformed or displaced. The larger diameter of the bore creates sufficient space for the material to escape.

[0053] The bearing section 43 is rotatably mounted in a receiving section 40 of the backrest support 3. For this purpose, it is received in a first bushing 41 and a second bushing 42, which are arranged in a recess of the backrest support 3, which is made of die-cast aluminum.

[0054] The bushings 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.

[0055] For example, a diameter of the first bushing can be 6 mm and a diameter of the second bushing can be 8 mm.

[0056] The bearing pin 31 is secured in the bushings 41, 42 by providing a first securing means 46 in the form of a retaining 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 a shoulder provided on the bearing pin 31 adjacent to the second bushing 42.

[0057] A backrest frame 16 attached to the backrest support 3 has a recess 53 and is pushed onto the receiving portion 40 of the backrest support 3 in the region of the recess 53. Furthermore, there is only a small gap 54 between the backrest frame 16 and the armrest support 4, 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, making them invisible from the outside.

[0058] Fig. 3 shows a cross-sectional view of a thread 33 of a bearing bolt 31.

[0059] The thread 33 has a core diameter 37 and a pitch 36. The pitch 36 is greater 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.

[0060] The profile of the thread 33 has a rounded tip 38. The width 39 of the tip 38 is less than 3% of the core diameter 37, for example 0.17 mm.

[0061] 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.

[0062] A total diameter 52 of the thread 33 is thus more than a third larger than the core diameter 37 and is, for example, 8.8 mm.

[0063] Fig. 4 shows a front view of a bearing pin.

[0064] In the area of the bearing section 43, the bearing pin 31 has a first step 44 and a second step 45, which also differ according to the different diameters of the bushings 41, 42. Accordingly, the first step 44 has, for example, a diameter of 6 mm and the second step 45 has, for example, a diameter of 8 mm.

[0065] A torque transmission section 49 is provided between the thread 33 and the bearing section 43, more precisely between the shoulder 34 and the shoulder 47. This section has a tool attachment 50, by means of which a tool torque can be transmitted to the bearing bolt 31, so that it can be easily screwed into the thread 33.

[0066] Fig. Figure 5A shows a schematic diagram of the kinematics of a chair 1 in an upright position. The kinematics will be explained below using this diagram.

[0067] The chair 1 has a schematically illustrated seat support 2 and a schematically illustrated backrest support 3, which are coupled via a transmission 5.

[0068] The transmission 5 determines a movement sequence of the seat support 2 and the backrest support 3 when pivoting from the upright position shown here into a backward pivoted position.

[0069] Furthermore, the seat support 2 and the backrest support 3 are coupled via an armrest support 4 designed as a force storage element. The armrest support 4 is designed and arranged such that it enables the movement sequence of the seat support 2 and the backrest support 3 predetermined by the transmission. Furthermore, the armrest support 4 provides a force that restores the seat to the upright position.

[0070] The force required to return the chair to the upright position is applied throughout the entire movement. In particular, the armrest support is tensioned as the chair pivots backward.

[0071] Furthermore, a preload of the armrest support 4 can be provided so that a restoring force is also applied in the upright position. In particular, in this case, a stop (not shown here) is provided, against which the preload is supported in the upright position.

[0072] To pivot the seat support and the backrest support from the upright position to the backward pivoted position, an external reclining force must be applied that works against the preload or against the restoring force.

[0073] Fig. 5B shows the sketch of the kinematics of a chair 1 according to Fig. 5A in a backward pivoted position.

[0074] In the rearwardly pivoted position, the armrest support 4, designed as a force storage element, is elastically deformed or tensioned and thus stores the work or energy generated during the rearward pivoting and tensioning. This energy, in a state free from external forces, in particular without a reclining force, produces a force that restores the armrest to the upright position.

[0075] The transmission 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. Furthermore, a third pivot point 11 fixedly arranged on the seat support 2 and a further fourth pivot point 12 fixedly arranged on the seat support 2 are provided.

[0076] The first pivot point 9 is coupled to the fourth pivot point 12 via a first link 13, which is rigidly connected to the backrest support 3 or formed integrally therewith. The first link 13 thus kinematically represents a part or an extension of the backrest support 3.

[0077] A second link 14 couples the second pivot point 10 with the third pivot point 11. The first link 13, the seat base 8, the second link 14 and the seat support 2 thus together form a kinematic quadrilateral with the first to fourth pivot points 9 to 12 as corners.

[0078] The first handlebar 13 and the second handlebar 14 are both in the upright position according to Fig. 5A and in the backward swivelled position according to Fig. 5B in the same direction, which is a direction away from the backrest support 3. The second link 14 is always slightly more inclined than the first link 13. For both links, the inclination to the vertical is greater in the upright position than in the rearwardly pivoted position. Thus, the third and fourth pivot points 11, 12, and thus the seat support 2, are raised during the rearward pivoting.

[0079] The fourth pivot point 12 is located in a rear region 18 of the seat support 2, and the third pivot point 11 is located in a front region 17 of the seat support 2. Furthermore, the second link 14, in addition to its greater inclination, is also longer than the first link 13. Therefore, the front region 17 of the seat support 2 lifts more than the rear region 18 when pivoting rearward, so that the seat support 2 is pivoted.

[0080] The armrest support 4, designed as a force storage element, is coupled to the seat support 2 at a first end 6 in a rotationally fixed manner.

[0081] At a second end 7, the armrest support 4 is rotatably coupled to the backrest support 3. Accordingly, a fifth pivot point 19 is provided, via which the armrest support 4 is rotatably coupled to the backrest support 3.

[0082] This fifth pivot point 19 can be realized with a connecting arrangement 30. The connecting arrangement 30 thus fulfills the function of a pivot point in the kinematics of the pivoting chair 1.

[0083] The fifth pivot point 19 or the connecting arrangement 30 advantageously enables a mixture of tensile or compressive and bending stress on the armrest support 4 during a rearward pivoting movement. The pivoting changes the distance of the fifth pivot point 19 from the first end 6, which is coupled in a rotationally fixed manner to the seat support 2, so that a tensile or compressive force is applied. Furthermore, during a pivoting movement, the fifth pivot point 19 is displaced relative to the first end in such a way that a force component transverse to the pure tensile or compressive load is added, and the armrest support is thus also subjected to a bending force, which causes a bending moment at the first end 6, which is coupled in a rotationally fixed manner to the seat support 2.

[0084] These loads are transmitted by means of the connecting arrangement 30 between the armrest support and the backrest support.

[0085] Fig. 6 shows a schematic sketch of the kinematics of a chair according to another embodiment.

[0086] A seat base 8 is symbolized here only with fixed bearings drawn at the first and second pivot points 9, 10.

[0087] The predetermined movement sequence of the transmission 5 depends in particular on the arrangement of the pivot points 9, 10, 11, 12. 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, is approximately the same as a distance between the fourth pivot point 12 and the third pivot point 11, which is formed by the seat support 2. 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, amounts to only a fraction thereof. 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.

[0088] 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°, here, for example, between 125° and 130°. In this way, the inclination of the first link 13 facing away from the backrest support 3 is achieved.

[0089] Fig. Figure 7A shows a side view of a chair in an upright position.

[0090] The chair 1 is designed here as an example in the form of a conference swivel chair, which has a kinematics according to Fig. 6.

[0091] The chair 1 has a seat surface 20, which is formed by a seat cushion 21 attached to the seat support 2. Furthermore, a backrest 22 is provided, which is formed by a backrest frame 16 attached to the backrest support 3 and a backrest cushion 23 attached thereto.

[0092] The backrest frame 16 is pushed with its recess 53 onto the receiving section 40 of the backrest support 3 and thus covers the receiving section, as shown in Fig. 2 shown.

[0093] The seat base 8 is coupled to a height-adjustable compression spring section 25, which is mounted on a roller-free base 24, which is designed as a swivel base.

[0094] Furthermore, an armrest 26 is provided, which is formed with the armrest support 4 and an armrest cushion 27 attached thereto.

[0095] The armrest support 4 is made entirely of glass fiber reinforced polyamide and has a curved shape which encloses an angle of approximately 290°.

[0096] With its first end 6, the armrest support 4 is screwed to the underside of the seat support 2 in a rotationally fixed manner. The second end 7 of the armrest support 4 is rotatably mounted on the backrest support 3 as part of a connecting arrangement 30, as shown in relation to Fig. 1 to 4.

[0097] The individual elements of the transmission 5 are also partially concealed here, in particular the second and third pivot points 10, 11. Clearly visible from the outside are the first link 13, which is partially formed integrally with the backrest support 3, and the second link 14.

[0098] Fig. 7B shows a side view of the chair according to Fig. 7A in a rearward pivoted position.

[0099] The backrest 22 is visibly pivoted backward here. For example, this represents a pivot angle of 21° compared to the upright position. The first link 13 is pivoted to the same extent together with the backrest support 3.

[0100] Due to the inclination of the first link 13 and the seat support 2, the second link 14 is also pivoted, but to a much lesser extent than the first link 13.

[0101] Both handlebars 13 and 14 are in the upright position according to Fig. 7A as well as in the backward swivel position according to Fig. 7B is tilted forwards, so that a weight force of a person sitting on the chair causes a restoring moment and the armrest support 4, which is designed as a force storage element, therefore only has to work against the reclining force.

[0102] The seat surface 20 is slightly raised overall and also pivots, but to a significantly lesser extent than the backrest 22. For example, this represents a pivot angle of 7°.

[0103] In the tensioned state shown, the armrest support 4 is subjected to both compressive and bending loads and is thus elastically compressed and bent. The corresponding forces are transmitted via the connecting arrangement 30 between the armrest support 4 and the backrest support 3.

[0104] The backward pivoted position is achieved by a person sitting on the chair 1 leaning backward and thus applying a reclining force to the backrest 22, which overcomes a spring force of the armrest support 4.

[0105] The backrest 22 can be adjusted relative to the Fig. 3B, the backrest can be pivoted even further rearward, for example, by approximately another 7°, through elastic deformation of the backrest support 3 and the backrest frame 16. The total possible pivot angle is thus approximately 28°.

[0106] The armrest support 4 is additionally tensioned so that additional forces are transmitted via the connecting arrangement 30.

[0107] Despite the large swivel range, all visible components of the chair 1, in particular the backrest support 3, the first link 13, the seat base 8 and the second link 14, as well as the seat support 2, are very slim. The same applies in particular to the armrest support 4, which has a narrow cross-section. The height of the cross-section is, in particular, less than five times the core diameter of the bearing pin 31.

[0108] Furthermore, no additional components are arranged between the seat support 2 and the seat base 8 or between the seat support 2 and the backrest support 3. This results in an extremely slim design of the chair 1 without sacrificing functionality compared to a conventional synchronous mechanism.

[0109] Fig. 8 shows a longitudinal sectional view of a chair 1.

[0110] In contrast to the embodiment according to Fig. 7A and B are an office swivel chair, which is particularly evident in the different design of the base 24' with castors 28 and its significantly higher connection to the compression spring section 25. Furthermore, the office swivel chair according to Fig. 8 essentially the same as the conference swivel chair according to Fig. 7A and Fig. 7B trained.

[0111] The office swivel chair is shown here in the upright position. Swiveling it into the backward tilted position is carried out in the same way as with Fig. 7B described possible.

[0112] The seat cushion 21 and the backrest cushion 23 are clearly visible in the sectional view. Furthermore, the fastening of the backrest frame 16 to the backrest support 3, which is realized with a fastening means 29 in the form of a screw, can be clearly seen.

[0113] Furthermore, the section shows a stop 15 that limits the pivoting range of the seat support 2 and backrest support 3 in the upright position. This stop is provided in the region of the third pivot point 11 in the form of a stop wedge, which is supported on the second link 14 in the upright position and on the seat support 2 in the rearwardly pivoted position. Preferably, a further stop 15 is provided in a similar manner at the fourth pivot point 12, which is concealed here.

[0114] The stop 15 is arranged and designed such that, when the stop 15 is reached, the armrest support 4 continues to be pre-tensioned, holding the backrest support 3 and the seat support 2 in the upright position. In this way, a defined position of the transmission 5, the seat support 2, and the backrest support 3 is ensured even in the upright position.

[0115] Although the present invention has been fully described above using preferred embodiments, it is not limited thereto but can be modified in many ways.

[0116] For example, the armrest support 4 does not have to be designed as shown. It would also be conceivable, for example, to kinematically design the armrest support as a pure tension spring and / or to attach an armrest body to it, for example, protruding from it. In this case, both ends of the armrest support 4 could also be rotatably coupled to the backrest support 3 or the seat support 2.

[0117] It would also be conceivable to design the chair not as a swivel chair but as a three- or four-legged chair. In this case, the seat base 8 is equipped with corresponding legs. List of reference symbols 1 chair 2 seat supports 3 backrest supports 4 armrest supports 5 Translation 6 first end 7 second end 8 Seat base 9 first pivot point 10 second pivot point 11 third pivot point 12 fourth pivot point 13 first handlebar 14 second handlebar 15 stops 16 backrest frames 17 front end 18 rear end 19 fifth pivot point 20 seats 21 seat cushions 22 Backrest 23 backrest cushions 24 Stand 25 compression spring section 26 Armrest 27 armrest cushions 28 rolls 29 fasteners 30 Connection arrangement 31 bearing bolts 32 bore 33 threads 34 paragraph 35 paragraph 36 gradient 37 core diameter 38 lace 39 width 40 recording section 41 first bearing bush 42 second bearing bush 43 storage section 44 first stage 45 second stage 46 first securing means 47 second securing device 48 bolt axis 49 Torque transmission section 50 tool approach 51 flank height 52 diameter 53 Recess 54 gap

Claims

[1] Connecting arrangement (30) for or in a chair (1), in particular a conference or office chair, comprising: an armrest support (4); a backrest support (3); and a bearing pin (31) fixed in the armrest support (4), which rotatably couples the armrest support (4) to the backrest support (3), wherein the armrest support (4) has a bore (32), in particular a blind bore, into which the bearing pin (31) is screwed and the bearing pin (31) has a self-retaining thread (33) and a shoulder (34), wherein the thread (33) is force-lockingly pre-tensioned in the bore (32) and the shoulder (34) is force-lockingly pre-tensioned on a shoulder or shoulder (35) of the bore (32), wherein the material of the armrest support (4) is completely unseparated in the region of the thread (33). [2] Connecting arrangement according to claim 1, characterized bythat the thread (33) has a pitch (36) per thread turn which is at least half of its core diameter (37). [3] Connecting arrangement according to one of claims 1 or 2, characterized by that the thread (33) has in profile a rounded tip (38) with a width (39) less than 5% of the core diameter (37), in particular less than 3% of the core diameter (37). [4] Connecting arrangement according to one of the preceding claims, characterized by , the armrest support (4) comprises a plastic material, in particular polyamide, preferably with a glass fiber content. [5] Connecting arrangement according to one of the preceding claims, characterized by that the backrest support (3) has a receiving section (40) with a first bearing bush (41) for rotatably receiving a bearing section (43) of the bearing bolt (31). [6] Connecting arrangement according to claim 5, characterized bythat the first bearing bush (41) receives a first step (44) of the bearing section (43) and a second bearing bush (42) is provided which receives a second step (45) of the bearing section (43). [7] Connecting arrangement according to claim 6, characterized by in that the bearing section (43) is fixed in the bearing bushes (41, 42) by means of a first securing means (46) provided in the region of the first step, in particular a mountable securing means, and a second securing means (47) adjacent to the second step (45), in particular a shoulder, so as to be rotatable about the bolt axis (48). [8] Connecting arrangement according to one of claims 5 to 7, characterized byin that the bearing bolt (31) has a torque transmission section (49) arranged between the thread (33) and the bearing section (43), which is provided with a tool attachment (50) designed to transmit a torque screwing the thread (33) into the bore (32) in a force-fitting manner. [9] Method for producing a connecting arrangement (30) for or in a chair (1), in particular a connecting arrangement according to one of the preceding claims, comprising the steps: Providing a backrest support (3), an armrest support (4), and a bearing bolt (31); Fixing the bearing bolt (31) in the armrest support (4), wherein for fixing purposes a thread (33) of the bearing bolt (31) is screwed into a thread-free bore (32) provided in the material of the armrest support (4), wherein the screwing is carried out by a separation-free forming operation at a slow speed; and Rotatable coupling of a bearing section (43) of the bearing bolt (31) to the backrest support (3). [10] Method according to claim 9, characterized by that the slow speed is less than one revolution per second. [11] Chair (1), in particular conference or office chair, with a seat support (2), with a connecting arrangement (30) according to one of claims 1 to 8 and / or manufactured by a method according to claim 9, wherein the armrest support (4) is fastened to the seat support (2) at an end (6) facing away from the backrest support (3) and the connecting arrangement (30) is provided for transmitting a reclining force between the backrest support (3) and the seat support (2). [12] Chair according to claim 11, characterized byin that the seat support (2) is coupled to the backrest support (3) via a transmission (5) which allows pivoting of the backrest support (3) and the seat support (2) with a predetermined movement sequence, wherein the armrest support (4) is designed as a force storage element and provides a restoring force for the predetermined movement sequence.

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