EP2721963B1 - Connection assembly of a seat, seat, assembly method - Google Patents

Description

FIELD OF THE INVENTION

The present invention relates to a connection arrangement of a seat for attaching a backrest support to a seat support. The present invention further relates to a chair and a mounting method for attaching a backrest support to a seat support.

TECHNICAL BACKGROUND

The present invention, as well as the problem underlying it will be explained below by way of example with reference to a high-sleeper office swivel chair, which is commonly referred to as executive chair, without limiting the invention to this type of seating.

In office swivel chairs usually a backrest is provided on which a person sitting on the office swivel chair, in particular for relaxation, can support. A backrest is usually attached to the seat support of the office swivel chair. During assembly, the backrest is often clamped to the seat support with a profile provided either on the seat support which can be displaced in a depth-displaceable manner or displaced vertically. The profile is firmly attached to the backrest. For clamping a clamping screw is arranged in the guide provided for the profile, wherein the profile is clamped by tightening the clamping screw. The installation of this office chair can z. B. also be executed by a customer at home or in a business itself, the components of the office chair are delivered here already in the preassembled state. However, a typical clamping screw for manual operation is typically formed relatively large dimensions and, for practical reasons, easily accessible, ie easily visible. This is preferred because of better handling, but rather not advantageous in terms of design. Furthermore, such a clamping screw can also solve unintentionally over time, for example due to creeping of a material of the screw or the guide, or because the clamping screw has not been tightened sufficiently firmly. The reverse case is also conceivable that the clamping screw can not be solved without destruction, for example due to deformation, corrosion, swelling or the like.

Design technically more appealing and safer types of fastening for securing a backrest to a seat support often have a very massive screwing the backrest support with the seat support below the seat. These fasteners are more likely to be used on high-quality office swivel chairs, which are delivered fully assembled. It usually requires several screws to attach the backrest support to the seat support. Mounting here is not trivial: To attach the screws is often a second mechanic for holding and aligning the backrest support on the seat support required. Alternatively, a special holding apparatus is necessary so that the screws can be screwed accurately. This means an increased installation effort, which leads to higher installation costs. Another example of the connection arrangement is out US 5184871 A known.

SUMMARY OF THE INVENTION

Against this background, the present invention seeks to provide a simple and safe to install connection arrangement of a chair. This object is achieved by a connection arrangement with the features of claim 1 and / or by a chair with the features of claim 13 and / or by a mounting method with the features of claim 15.

• Eine Verbindungsanordnung eines Sitzmöbels zum Anbringen eines Lehnenträgers an einen Sitzträger, mit einem Koppelschacht und einem Koppelfortsatz, wobei der Koppelfortsatz im montierten Zustand zumindest abschnittweise in den Koppelschacht eingeführt ist, mit einem am Koppelfortsatz befestigten Koppelbolzen und einer innerhalb des Koppelschachtes vorgesehenen Koppelnut, mit einem Koppelelement, welches einen am Koppelbolzen einhängbaren Einhängfortsatz und einen in die Koppelnut einführbaren Einführfortsatz aufweist, wobei das Koppelelement, die Koppelnut und der Koppelbolzen derart angeordnet und ausgebildet sind, dass im montierten Zustand am Koppelelement eine Zugspannung zwischen Einhängfortsatz und Einführfortsatz anliegt, welche den Koppelfortsatz im Koppelschacht hält und den Einführfortsatz selbsthemmend in der Koppelnut hält.
• Ein Sitzmöbel, insbesondere ein Bürodrehstuhl, mit zumindest einem Lehnenträger und einem Sitzträger, wobei der Lehnenträger mittels einer erfindungsgemäßen Verbindungsanordnung mit dem Sitzträger verbunden ist.
• Ein Montageverfahren zum Anbringen eines Lehnenträgers an einen Sitzträger, insbesondere mit einer erfindungsgemäßen Verbindungsanordnung, mit den Schritten: a) Bereitstellen eines Koppelfortsatzes, an welchem ein Koppelbolzen befestigt ist, eines Koppelschachts, an welchem eine Koppelnut vorgesehen ist und eines Koppelelements, welches einen Einhängfortsatz und einen Einführfortsatz aufweist; b) Einführen des Koppelfortsatzes in den Koppelschacht; c) Einhängen des Einhängforsatzes am Koppelbolzen; d) Einführen des Einführfortsatzes in die Koppelnut; e) Anlegen einer Zugspannung am Koppelelement zwischen Einhängfortsatz und Einführfortsatz.

Accordingly, it is provided:

• A connection arrangement of a seat for attaching a backrest support to a seat support, with a coupling shaft and a coupling extension, the coupling extension is at least partially inserted in the assembled state in the coupling shaft, with a coupling extension attached to the coupling pin and provided within the coupling shaft coupling groove, with a coupling element , Which has a hook-on suspension pin attachment process and an insertable into the coupling insertion insertion, wherein the coupling element, the coupling groove and the coupling pin are arranged and designed such that in the mounted state on the coupling element tensile stress between Einhängfortsatz and insertion extension is applied, which the coupling extension in the coupling shaft holds and keeps the insertion process self-locking in the coupling groove.
• A seating, in particular an office swivel chair, with at least one backrest support and a seat support, wherein the backrest support is connected by means of a connection arrangement according to the invention with the seat support.
• An assembly method for attaching a backrest support to a seat support, in particular with a connection arrangement according to the invention, comprising the steps of: a) providing a coupling extension, to which a coupling bolt is fastened, a coupling shaft, on which a coupling groove is provided, and a coupling element, which is a suspension extension and an insertion extension; b) inserting the coupling extension into the coupling shaft; c) hanging the Einhängforsatzes on the coupling pin; d) inserting the insertion extension into the coupling groove; e) applying a tensile stress on the coupling element between Einhängfortsatz and insertion extension.

The idea underlying the present invention is to allow an elegant, tool-free installation of a backrest on the seat support of a seat, in particular a backrest to the seat support of an office swivel chair. For this purpose, for connecting a backrest support with a seat support relative to the seat support the rotational degrees of freedom, two translational degrees of freedom and a direction of the third translational degree of freedom limited by introducing a coupling extension in a coupling shaft and a zugvorspannbares coupling element for limiting the second direction of the third translational degree of freedom.

For this purpose, the coupling element can be suspended with a suspension extension on a coupling bolt of the coupling extension and can be inserted with an insertion extension into a coupling groove of the coupling shaft, the tension prestressing causing a self-locking retention of the insertion extension in the coupling groove. A coupling bolt is to be understood as any type of suspension device, which is suitable for a suspension extension can be suspended therein or thereto. A coupling groove is to be understood as any type of insertion device which is suitable for inserting an insertion extension into or onto it and being self-locking in or on it with a tensile stress. The coupling groove is provided within the coupling shaft, which also includes that the coupling groove can be provided within a longitudinal or transverse projection of the coupling shaft. This is the case, for example, if the coupling shaft in front of the position of the coupling groove expires and, for example, merges into a solid part, wherein the coupling groove is provided in the solid part, or if the coupling groove is provided on an outer side of the coupling shaft. However, the coupling groove is preferably provided on the inside of the coupling shaft, which is advantageously arranged hidden from the outside.

As a backrest support of a backrest is preferably provided. Alternatively or additionally, the support of an armrest may be provided as a backrest support.

A mechanical advantage of the connection arrangement is that a play possibly adjusting with time in the connection arrangement is compensated by the tension prestressing.

A design technical advantage of the connection arrangement is that the complete connection can be concealed from the outside within the coupling shaft and thus invisible from the outside.

A mounting technical advantage results from the easy and quick mountability for producing a mounted state. It is a tool z. B. provided by an individual with a few assembly steps easily mountable connection assembly.

A logistical advantage in the delivery of the seat results from a volume-optimized transport capability in unassembled state of the connection assembly, which is favored by the ease of assembly. In the unassembled state, the seating furniture with a better volume utilization is packable and thus cheaper to transport than in the assembled state. The simple assembly makes it possible to expect even an untrained person, for example, a buyer for home assembly. Alternatively, the ease of assembly allows shipment to a distributor and final assembly by sales personnel at the distributor.

The assembly is varied in terms of the order of the assembly steps, which allows for different assembly concepts, such as home, sales offices or factory final assembly, different solutions. These can be configured according to the respective requirements for ease of installation and the ability of the person to be mounted.

For example, at a point of sale or factory assembly, step a), then step b), then step c) and, finally, steps d) and e) may be performed simultaneously. The application of the tensile stress is carried out during the insertion, for example by an elastic deformation of the coupling element to or during insertion. This represents a very simple realization of the final assembly, which e.g. is easily and quickly feasible by the instructed personnel of a sales or factory. Furthermore, the coupling element can in this case be formed in one piece, which advantageously reduces the number of parts and the assembly steps.

In a home final assembly, for example, first step a), then step d), then simultaneously steps b) and c) and finally step e) are carried out, wherein the application of the tensile stress, for example with a final manipulation of the coupling element, such as the operation of a Übertotpunkthebels , can be applied. Here, therefore, only the insertion extension is provided in the coupling groove and then simultaneously introduced the coupling extension in the coupling shaft and the suspension extension mounted on the coupling pin. Thus, after step b) and c) and before step e) a pre-locked state is provided. This increases the ease of assembly, because the backrest support must not be held from the outside when applying the tension. This particularly comfortable realization of the final assembly is thus very easy to carry out by technically untrained persons, such as sellers, agents or buyers, and thereby very safe to use.

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.

In an advantageous embodiment of the coupling pin is arranged on a introduced into the coupling shaft portion of the coupling extension. Furthermore, the coupling extension on a first opening through which the Einhängfortsatz is inserted into the coupling shaft. Thus, advantageously, the coupling pin and the attachment extension can be arranged within the coupling shaft, so that they are covered by the coupling shaft and thus invisible from the outside, which is advantageous from a design point of view.

According to a further advantageous embodiment of the coupling extension is formed in two parts, wherein the two coupling extension parts are connected via the coupling pin and the first opening between the two coupling extension parts is arranged. Thus, the first opening is realized simply by the bipartite and a distance between the coupling extension parts. As a result, the coupling extension parts can be formed as solid parts, for example as castings, without the need for subsequent forming or machining for the introduction of the opening. As an alternative to a bipartite of the coupling extension, a shaft-like formation of the coupling extension is conceivable, in which case the first opening in the shaft-like formation is introduced and the coupling pin is secured in the shaft-like training.

In an advantageous embodiment, the coupling shaft has a second opening, through which the coupling extension can be inserted into the coupling groove. In this case, the first and second openings in particular form a common opening of the connection arrangement. This means that the first and second openings in the assembled state at least partially overlap and the coupling element is preferably designed such that it covers the common opening in the mounted state. Alternatively, it is also conceivable to provide the first and second openings as separate openings. Also in this case, the first and second openings in the assembled state are covered by the coupling element. In both cases, advantageously, all the connecting elements can be arranged invisibly from the outside within the coupling shaft, with the opening of the coupling shaft also being concealed.

According to a preferred embodiment, the coupling element and the coupling groove together form a Übertotpunktklemme, which is designed such that when suspended Einhängfortsatz by inserting the insertion extension into the coupling groove a dead center is exceeded. Thus, the tensile stress in a simple manner, by elastic deformation of the coupling element, can be applied to the same. For example, the input opening of the coupling groove is laterally offset from the direct connecting line between coupling pin and the end position of the insertion in the coupling groove provided so that the coupling element for inserting the insertion into the coupling groove has to bridge a further distance than in the assembled state. The dead center is in this case at a position of the coupling element, in which the insertion extension overcomes the entrance into the coupling groove and is inserted into the coupling groove. When this point is exceeded is, the insertion extension is drawn by the voltage applied to the coupling element tensile stress in the coupling groove, so that the insertion extension then holds self-locking in the coupling groove. To release the coupling element, a corresponding force would then have to be exerted on the coupling element in order to pull the insertion extension counter to the tensile stress so far out of the coupling groove that the insertion extension overcomes the input or output of the coupling groove again and is pulled out of the coupling groove.

In preferred embodiments, the coupling element is rigid and the coupling groove extends in such a way that the dead center is exceeded upon insertion of the insertion extension into the coupling groove by flexible deformation of the coupling element. Rigid is to be understood here in such a way that no joints are provided on the coupling element. The course of the coupling groove for forming an over-center terminal can be configured in many ways. For example, the coupling groove can run normal, ie perpendicular to the direct connecting line between the attachment extension and the end position of the insertion extension, and have an input offset to this line. Further, the dead center effect can be further enhanced by the coupling groove is disposed at least in the region of its entrance at an acute angle to said connecting line. Furthermore, intermediate latching stages within the coupling groove are also conceivable, which may be designed, for example, as flat or step-like shoulders. The coupling element is flexibly deformable to overcome the dead center, in particular designed resiliently, in particular, a spring bridge between the Einhängfortsatz and the insertion extension can be provided. Furthermore, the appendage process and the insertion process itself can be flexible. The coupling groove is formed, for example, as finger-milling cutters symmetrically arranged on two opposite inner surfaces of the coupling shaft into which a cross-bolt designed as a transverse pin Introductory process is insertable. Overall, this provides a simple connection arrangement that is tool-free, lightweight, safe and quick to assemble.

In an alternative but equally preferred embodiment, the coupling element on a Übertotpunkthebel, which is arranged and designed such that the insertion is at least partially inserted into the coupling groove without effort and is pressed to apply the tension of the Übertotpunkthebel over its dead center. This embodiment represents an alternative to the rigid-elastic design of the coupling element. However, this does not exclude that even in the embodiment with Übertotpunkthebel flexible training may be provided. For applying a tensile stress with a coupling element according to this embodiment, the coupling element is first hung with the Einhängfortsatz on the coupling pin and inserted with the insertion extension in the coupling groove, which can be carried out in reverse order depending on the arrangement of the Einhängfortsatzes. Subsequently, the Übertotpunkthebel is pressed over its dead center to apply the tension. Thus, the tension is applied in a particularly user-friendly manner.

In preferred embodiments, the Übertotpunkthebel is provided on the insertion extension, wherein optionally or additionally, the axis of rotation of the Übertotpunkthebels is provided inserted into the coupling groove. Furthermore, the suspension extension is optionally or additionally provided hinged to the over-center lever. Thus, the pivot point of the Übertotpunkthebels lie in the region of the coupling groove, so that generated by exceeding the dead center advantageously directly on the Übertotpunkthebel the tension and is supported against the coupling shaft. This is advantageous because in this way tensile forces do not have to be transmitted with additional elements to to act the coupling element. Furthermore, a functional integration for the component of the axis of rotation is realized in this way, which serves not only as an axis for the Übertotpünkthebel, but at the same time as a frictional producing part of the insertion extension.

In preferred embodiments, an on the coupling shaft attachable and hinged to the Übertotpunkthebel actuating lever is provided on the coupling element, which is arranged and designed such that upon actuation of the Übertotpunkthebels the dead center is exceeded. The Übertotpunkthebel can be hung on the coupling shaft, for example, also via an opening provided on the coupling shaft groove, in which in particular a provided on the operating lever cross bolt is hung. Thus, an advantageously easy to operate from the outside actuating element for actuating the Übertotpunkthebels is provided, which preferably also serves to cover the common opening of the connection assembly simultaneously.

In preferred embodiments, the actuating lever on the coupling shaft can be suspended in a region which is arranged in the mounted state in the region of the coupling bolt. The actuating lever has a bearing surface for the suspension extension, which holds the suspension extension within the coupling shaft at the level of the coupling bolt. Thus, on the one hand, the coupling element as a unit easy to handle, and on the other hand can be advanced by hooking the operating lever on the coupling shaft with simultaneous insertion of the insertion into the coupling groove, the coupling element on the coupling shaft, in particular before an insertion of the coupling extension in the coupling shaft. Furthermore, a pivot point for the actuating lever is provided by the hanging of the actuating lever, by which the actuating lever is rotatable towards the coupling shaft, wherein preferably during rotation of the operating lever to the coupling shaft towards the Übertotpunkthebel is pressed over the dead center. Thus, the actuating lever is advantageous in the mounted state of the coupling shaft and can cover the common opening of the connection assembly in this position. The coupling shaft or the entire connection arrangement is thus closed, so that advantageously no connecting elements are visible from the outside. Furthermore, the suspension extension is positioned by the support surface so that it can be easily suspended from the coupling pin.

In preferred embodiments, the suspension extension on the side facing away from the coupling pin in the assembled state has an obliquely or convexly shaped surface which is arranged such that in an intermediate mounting state, in which the actuating lever is mounted on the coupling shaft and the insertion extension is inserted into the coupling groove, is raised by inserting the coupling extension in the coupling shaft of the attachment extension on contact of the surface with the coupling pin. Thus, the Einhängfortsatz be raised by the insertion movement of the coupling extension into the coupling shaft. In particular, the previously coupled to the coupling shaft coupling element can be opened with this training within the coupling shaft by raising the Einhängfortsatz, whereby the Einhängfortsatz within the coupling shaft, without additional actuation of the coupling element from the outside, can be suspended on the coupling pin.

In preferred embodiments, the coupling extension is inserted so far into the coupling shaft, that the coupling pin infiltrates the Einhängfortsatz during insertion of the coupling extension in the coupling shaft such that the suspension extension occupies by dropping or snapping in the direction of the support surface pre-latched state with the coupling pin. Thus, the backrest is already with the Seat carrier pre-locked before the Übertotpunkthebel is actuated. This contributes advantageously to mounting safety when mounting. If the connection arrangement is in the pre-locked state, only the operating lever must be actuated in order to apply the tensile stress to the coupling element and thus to positively connect the coupling extension with the coupling shaft. The backrest does not need to be held anymore. Thus, the assembly of the backrest support on the seat furniture carrier can be advantageously carried out easily by an individual.

In a preferred embodiment of a chair, the seating is designed as a high-sleeper office swivel chair with a backrest. The backrest support is designed as a backrest support and the seat support as a seat support of the office swivel chair. The coupling extension is provided on the seat support of the office swivel chair and in particular formed integrally with the seat support of the office swivel chair. Alternatively, the coupling extension may be formed as a separate, fixed to the seat support part. A coupling shaft is provided on the backrest support and in particular formed integrally with the backrest support.

Alternatively or additionally armrests can be provided, which are also connected by means of a connection arrangement according to the invention with the seat support. For this purpose, correspondingly arranged coupling extensions are provided on the seat carrier. Furthermore, at least one armrest carrier designed as a backrest support is provided on which a coupling shaft is provided.

For the backrest support and / or the armrest support connecting arrangements according to the invention are provided, which each connect the backrest support and / or the armrest support to the seat support of the office swivel chair. In the event of two separate armrests separate armrest support and connection arrangements are provided. For one-piece training with the backrest carrier of the coupling shaft can be formed as an extension of the arm or backrest support. This is particularly easy to implement when the back or armrest support is made of plastic. The backrest or armrest carrier can then be a molded part, for example. Likewise, a one-piece design is conceivable from an aluminum material. In addition, wood-based materials, composites, in particular fiber composites or wood composites in question.

The seat support is preferably formed from readily castable materials, such as plastic or aluminum, in particular in a one-piece design with the insertion extension. Alternatively, the insertion extension can be attached to the seat support as an initially separate part, for example with fastening means or by form or material connection. In this case, a variety of other materials, such as e.g. Steel, preferably used. In addition, alternatively, the coupling shaft on the backrest carrier with fastening means, or by form or material connection can be fastened.

The above embodiments and developments can, if appropriate, combine with each other as desired. 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 schematische Skizze einer erfindungsgemäßen verbindungsanordnung;

Fig. 2

eine Explosionsdarstellung eines Bürodrehstuhls mit einer erfindungsgemäßen Verbindungsanordnung;

Fig. 3A-3C

eine erfindungsgemäße Verbindungsanordnung gemäß einem Ausführungsbeispiel der vorliegenden Erfindung in einer Längsschnittdarstellung sowie Stadien eines Montageprozesses der Verbindungsanordnung;

Fig. 4

eine Darstellung der Verbindungsanordnung aus Fig. 3A-C ohne Koppelschacht;

Fig. 5

eine perspektivische Ansicht einer Längsschnittdarstellung gemäß dem Ausführungsbeispiel einer Verbindungsanordnung aus Fig. 2;

Fig. 6A-6D

eine Längsschnittdarstellung einer weiteren Ausführungsform einer erfindungsgemäßen Verbindungsanordnung sowie Stadien des Montageprozesses der Verbindungsanordnung;

Fig. 7

ein Koppelelement gemäß der Ausführungsform einer Verbindungsanordnung aus Figur 6A-6D in einer perspektivischen Einzelteildarstellung;

Fig. 8

eine perspektivische Darstellung der Längsschnittansicht aus Figur 6D;

Fig. 9

eine perspektivische Ansicht einer Verbindungsanordnung gemäß dem Ausführungsbeispiel aus Fig. 6A-6D ohne Koppelschacht.

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 schematic sketch of a connection arrangement according to the invention;

Fig. 2

an exploded view of an office swivel chair with a connection arrangement according to the invention;

Figs. 3A-3C

a connection arrangement according to one embodiment of the present invention in a longitudinal sectional view and stages of a mounting process of the connection assembly;

Fig. 4

an illustration of the connection arrangement Fig. 3A-C without coupling shaft;

Fig. 5

a perspective view of a longitudinal sectional view according to the embodiment of a connection arrangement Fig. 2 ;

Figs. 6A-6D

a longitudinal sectional view of another embodiment of a connection arrangement according to the invention as well as stages of the assembly process of the connection arrangement;

Fig. 7

a coupling element according to the embodiment of a connection arrangement FIGS. 6A-6D in a perspective Einzelteilildstellung;

Fig. 8

a perspective view of the longitudinal section view FIG. 6D ;

Fig. 9

a perspective view of a connection arrangement according to the embodiment of Figs. 6A-6D without coupling shaft.

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 schematic diagram of a connection arrangement 1 of a chair according to the invention. This sketch serves only to illustrate the principle of the connection arrangement and is therefore shown for better clarity without hatching, visible edges and the like. The Verbindugnsanordnung 1 has a coupling shaft 2, within which a coupling groove 5 is provided. Furthermore, the connection arrangement 1 has a coupling extension 3, to which a coupling bolt 4 is attached. The connection arrangement is shown in an assembled state, in which the coupling extension 3 is inserted into the coupling shaft 2. The connection arrangement further has a coupling element 6, on which an attachment extension 7 and an insertion extension 8 are provided. The Einhängfortsatz 7 is formed on the coupling pin 4 hooked and the insertion extension 8 is formed in the coupling groove 5 inserted. On the coupling element is located between the insertion extension 8 and the attachment extension 7 to a tensile stress, which holds the coupling extension in the coupling shaft 2. Further, the tension holds the insertion extension 8 in the coupling groove 5. In the illustrated embodiment, this is ensured by the fact that the connecting line, not shown, between the attachment extension and the insertion extension is shorter in the mounted state than in a state in which the insertion extension enters the entrance the coupling groove is inserted with hinged attachment process. The coupling extension 3 is inserted in the coupling shaft 2 only up to a stop, so that in the mounted state, the tension is supported at the stop between coupling shaft 2 and coupling extension.

FIG. 2 shows an office swivel chair 10 with a connection arrangement according to the invention. The office swivel chair 10 has a backrest support 11 and a seat support 12. On the surface of the seat support 12, a seat surface 13 is provided. At the bottom of the seat support 12 a swivel chair column 14 is provided, which connects the seat support 12 with a chair cross 15. Chair chair 16 are attached to the chair cross 15. The backrest support 11 has a coupling shaft 2 and the seat support 3 has a coupling extension 3. Further, a coupling element 6 is provided, by means of which the coupling shaft and the coupling extension are connectable. The coupling shaft 2, the coupling element 6 and the coupling extension 3 are part of a connection assembly according to the invention 1. In the embodiment shown an office swivel chair this connection assembly 1 is used for attaching a provided on the backrest support 11 backrest 17 to the seat support 12. Furthermore, further, not shown connection arrangements be provided for example for attaching armrests, not shown. These connection arrangements can also be designed according to a connection arrangement 1 according to the invention. The seat 13 is conventional, that is mounted on the seat support 12 via fastening means or locking means. Also, the seat support 12 and the swivel chair column 14 are conventionally connected to each other. The same applies to the connection between the swivel chair column 14 and the chair cross 15 and between the chair rollers 16 and the chair cross 15.

The FIGS. 3A to 3C show an embodiment of a connection assembly 1 according to the invention in a longitudinal sectional view and stages of a mounting method for attaching a backrest support 11 to a seat support 12. The connection assembly 1 has in this embodiment a coupling shaft 2 and a coupling extension 3 and a coupling element 6. In the illustrated state, the coupling extension 3 is inserted into the coupling shaft 2. The coupling element 6 is mounted with its trained as a round hook Einhängfortsatz 7 on the coupling pin 4, which is attached to the coupling extension 3, mounted. For this purpose, the Einhängfortsatz 7 was previously introduced through the first opening 21 of the coupling extension 3 in the coupling shaft 2 and mounted on the coupling pin 4. The coupling element 6 also has an insertion extension 8, which is formed in this embodiment as a provided with a cross bolt, mounted on a nose sleeve. This insertion extension 8 is inserted through an opening 22 of the coupling shaft in the coupling groove 5. The first opening 21 and the second opening 22 form a common opening 23, via which the coupling shaft 2 is accessible from the inside.

The coupling element 6 is formed in this embodiment as a one-piece, elastically deformable coupling element 6. The coupling element 6 and the coupling groove 5 together form a Übertotpunktklemme, wherein the dead center is reached when the insertion extension 8 is located at the opening 22 at the entrance of the coupling groove 5. To get to this point, the coupling element 6 must be elastically deformed, whereby it is biased. The preload is maximum at the dead center. Once the coupling element 6 has exceeded the dead center with the insertion extension 8, it is drawn by the biasing force in the coupling groove 5. The coupling groove 5 is so aligned that a force vector of the tensile biasing force has a component which extends in the direction of the coupling groove. When the insertion extension is completely inserted into the coupling groove, a tension applied to the coupling element remains.

FIG. 3A shows the coupling element 6 already in an elastically deformed state shortly before reaching the dead center with the insertion extension 8 at the entrance of the coupling groove. 5 FIG. 3B shows a position in which the dead center has just been exceeded and the insertion extension 8 is already in the coupling groove 5 and partially inserted therein. In FIG. 3C the assembled state is shown, in which the insertion extension 8 is completely inserted into the coupling groove 5. In this state, the coupling element 6 is still slightly elastically deformed, and there is a tensile stress between the insertion extension 8 and the Einhängfortsatz 7 on the coupling element 6 at. By this tensile prestress the coupling extension 3 is held in the coupling shaft 2. In this mounted state, the opening 23 is at least partially covered or closed by the coupling element 6. Consequently

In the embodiment shown here, the coupling shaft 2 is formed integrally with a backrest support, which is designed as an aluminum casting. The coupling extension 3 is in this embodiment as a seat support formed with fasteners attachable aluminum casting.

In FIG. 4 is the connection arrangement of the FIGS. 3A to 3C shown in a perspective view without the coupling shaft 2. The coupling extension 3 is formed with two coupling extension parts 31 and 32. These coupling extension parts 31 and 32 are connected to each other via the coupling pin 4. The coupling extension parts 31 and 32 are mutually mirror-symmetrical, wherein the mirror plane extends centrally through a central cross-sectional plane of the coupling bolt. Symmetrical to this level, the coupling element 6 is shown in this illustration. In this embodiment, the intermediate space between the two coupling extension parts 31 and 32 forms the first opening 21 of the coupling extension 3. The coupling extension 3 has stop surfaces 33 on the coupling extension parts 31 and 32, against which stop surfaces of the coupling shaft, for example the end surfaces of the shaft, can abut to support the tension applied by the coupling element.

The coupling extension 3 has various attachment openings 34 for attaching the coupling extension 3 on the seat support 12 of a chair 10. In a possible delivery of a chair with this connection arrangement of the coupling extension 3 is preassembled on the seat support 12. The seating can be easily and quickly assembled after being transported locally by mounting the connection assembly at its destination or at a distribution point. Furthermore, this connection arrangement can also be used for optimized factory final assembly.

FIG. 5 shows a representation of the embodiment according to the FIGS. 3A to 3C in a perspective longitudinal section in the assembled state. Therein are those described above Elements for better illustration again shown in perspective.

The FIGS. 6A to 6D show an embodiment of the inventive connection assembly 1 of a chair 10 and representations of stages of their assembly process, in particular for connecting a backrest support 11 with a seat support 12. The illustrated embodiment differs above all in terms of the design of the coupling element 6 ', which is why in the following mainly on the Differences to the preceding embodiment will be received. The coupling extension 3 and the coupling shaft 2 are formed substantially equal to the preceding embodiment. The coupling element 6 ', however, in contrast to an over-center lever 41. This has an axis of rotation 42 which is arranged and formed insertable into the coupling groove 5. That is, the Übertotpunkthebel 41 is formed on the insertion extension 8 'and the axis of rotation 42 of the Übertotpunkthebels 41 forms the insertable into the coupling groove 5 portion of the insertion extension 8' from. In addition, the suspension extension 7 'is articulated on the over-center lever 41, which in this embodiment is designed as a latch or snap hook. On the other side of the Übertotpunkthebels 41 an actuating lever 43 is articulated to the Übertotpunkthebel 41, via which the Übertotpunkthebel 41 is actuated. This actuating lever 43 is suspended in a suspension groove 47 and has accordingly trained hooking means 48, in particular a transverse bolt on. In the area of the suspension means 48, the actuating lever 43 is further provided with a bearing surface 45. In the unassembled state, this support surface 45 is provided for supporting the Einhängfortsatzes 7 '. The support surface 45 holds the Einhängfortsatz 7 'in the unassembled state at the height of the coupling pin 4. The coupling element 43 is by hooking the operating lever in the Einhängnut 47 and by introducing the axis of rotation 42 in the coupling groove 5 in a prefabricated state on the coupling shaft 2 attachable.

In the illustrated embodiment, both this advanced state and the position of the Einhängfortsatz at the height of the coupling pin is particularly advantageous, because in this way, the coupling extension 3 can be introduced into the coupling shaft 2 and the Einhängfortsatz 7 'at the same time by the insertion movement in or on the coupling pin 4 are mounted. In order for this to work smoothly, the attachment extension 7 'has an inclined surface 46 on the side facing away from the coupling pin 4 in the shown assembled state. By means of this inclined surface 46, the attachment extension 47 is raised when the coupling extension 3 is inserted, when the surface 46 comes into contact with the coupling pin 4. The coupling extension 3 is then so far inserted into the coupling shaft 2, that the Einhängfortsatz 7 'is completely infiltrated by the coupling pin 4 during insertion of the coupling extension 3 and in the fully imported state falls back onto the support surface 45 and snaps down.

The snap-down can be assisted by a spring bias of the attachment extension 7 '. Preferably, however, the suspension extension 7 'falls down only by the force of gravity, which is sufficient due to the fact that the assembly can be carried out in the standing state of the seat. In this state, in FIG. 6A is shown, the connection assembly 1 is in a pre-locked state. Thus, the coupling shaft 2 can no longer readily detach from the coupling extension 3, which is why the backrest support 11 of the chair no longer needs to be held. This allows the fitter to actuate the actuating lever 43, without having to hold the coupling shaft 2 to the coupling extension 3 from the outside.

To attach the coupling extension 3 with the coupling shaft 2, the operating lever 43 in the in FIG. 6A shown position in the direction of the coupling shaft 2 pressed into the opening 23. Initially, the attachment extension 7 is completely contracted with the coupling pin 4, as in FIG FIG. 6B shown. The Übertotpunkthebel 41 is already twisted to some extent, but not yet to the dead center. The operating lever 43 moves slightly in the direction of the coupling shaft 2 and its opening 23. In this position, no force must be applied to the operating lever. However, a force applied to the actuating lever 43 force is necessary to reach the dead center. FIG. 6C shows the Übertotpunkthebel 41 at the dead center. In this position, a maximum tensile stress between the insertion extension 8 'and the Übertotpunkthebel 41 and the Einhängfortsatz 7' is applied to the coupling element 6 '. To get into this position, the Übertotpunkthebel must be rotated by the introduced on the operating lever 43 actuating force to the dead center. At dead center itself, the actuating lever 43 is then approximately free of forces. From this position, the actuating lever 43 can be pressed over the dead center, so that the Übertotpunkthebel in a in FIG. 6D shown over-center position snaps. The actuating lever 43 has arrived completely in this position in its end position and is preferably arranged such that it fills the opening 23 and is flush with the coupling shaft 2. Between the Übertotpunkthebel 41 and the Einhängfortsatz 7 is in this position on a tensile stress, which holds the Übertotpunkthebel 41 in the Übertotpunktstellung. This tension is slightly lower than the tension at the dead center, whereby a self-locking is achieved, on the one hand leads to holding the Übertotpunkthebels 41 in the over-center position and on the other hand to hold the entire insertion extension 8 ', in particular the axis of rotation 42 in the coupling groove 5. By the applied tensile stress of the coupling extension 3 is held in the coupling shaft 2. The embodiment shown here is particularly suitable for home assembly or self-assembly of a customer due to the high ease of use. Conceivable, however, is also the use for the sales or factory assembly.

FIG. 7 shows the coupling element 6 in a perspective detail view. In this case, the axis of rotation 42 and the suspension means 48 is shown as laterally projecting bolts. The inclined surface 46 is formed as a wedge-shaped projection on the Einhängfortsatz 7 '. The bearing surface 45 is formed as a fan-shaped extension 45 on the actuating lever 43. The Übertotpunkthebel 41 has a total of three axes of rotation, wherein the axis of rotation 42 represents the axis defined by the coupling groove 5 and the other two axes of rotation are provided for articulating the Einhängfortsatzes 7 'and the actuating lever 43.

FIG. 8 shows a state of the connection arrangement according to the invention according to the sectional view FIG. 6D in a perspective sectional view. All elements described above are shown in perspective for better illustration.

FIG. 9 shows a representation of the connection arrangement according to the FIGS. 6A to 6D without the coupling shaft. In the FIG. 9 illustrated embodiment corresponds apart from the coupling element 6 'substantially in FIG. 4 illustrated embodiment of the coupling extension 3. In the two embodiments according to the FIGS. 3A to 5 and 6A to 9 Advantageously identical coupling extensions 3 and also identical coupling shafts 2 can be used. In both embodiments, the coupling extensions 3 in the coupling shaft 2 can be inserted, and thus except for one direction in all Freedom limited. The free direction is then limited by the coupling element 6 or 6 '. Thus, very many identical parts can be used for the two different embodiments, which also have different assembly concepts. In essence, only another coupling element 6 or 6 'is used. Thus, advantageously, at the same time, a preferred embodiment for factory assembly according to the FIGS. 2A to 5 and a preferred embodiment for home assembly according to the FIGS. 6A to 9 mainly realized with identical parts, with only different coupling elements 6 and 6 'are provided.

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

For example, the coupling pin may be formed differently in an alternative embodiment of the coupling extension. If the coupling extension is designed, for example, as a shaft, the coupling bolt can also be replaced by a Einhängausnehmung in this shaft. The formation of the attachment process and the force application points would have to be adjusted accordingly.

The situation is similar with an alternative embodiment of the coupling shaft. If, for example, the duct shape runs out at a position which is closer to the coupling bolt than the coupling groove, that is to say if the coupling groove does not protrude into a cavity of the shaft, but adjoins it, it is conceivable to adapt the coupling element such that it only engages from outside is introduced into the groove. In this case, the coupling element does not extend within the coupling shaft, but on the outer surface or in a separately provided recess.

Furthermore, it would be conceivable not to apply the tensile stress with a dead center being exceeded, but rather, for example, by means of an intended and predetermined plastic or plastic-elastic deformation of the coupling element. For example, the coupling element could have a portion provided for deformation, which has a folded-out long and a deformed, shortened state. To apply the tension then the shortened state is taken. Furthermore, the use of a shrinking material on the coupling element would also be conceivable, which is shrunk for applying the tensile stress, for example by heating and thus generates a tensile stress.

LIST OF REFERENCE NUMBERS

1

connection arrangement

2

coupling shaft

3

Koppelfortatz

4

coupling bolts

5

coupling groove

6

coupling element

7

Einhängfortsatz

8th

Einführfortsatz

10

Office chair

11

Backrest support

12

seat support

13

seat

14

Swivel chair column

15

chair cross

16

Castor chair

17

backrest

21

first opening

22

second opening

23

common opening

31

first coupling extension part

32

second coupling extension part

33

attack

34

mounting holes

41

Übertotpunkthebel

42

axis of rotation

43

actuating lever

44

Area

45

bearing surface

46

surface

47

Einhängnut

48

hooking means

Claims (15)

1. Connection arrangement (1) of a seating (10) for attaching a backrest support (11) to a seating support (12),
   comprising a coupling shaft (2) and a coupling projection (3), the coupling projection (3) being introduced into the coupling shaft (2) at least in portions in the mounted state,
   comprising a coupling bolt (4) fixed to the coupling projection (3) and a coupling groove (5) provided inside the coupling shaft (2),
   comprising a coupling element (6), which has a suspension projection (7) suspendable on the coupling bolt (4) and an introduction projection (8) introducible into the coupling groove (5),
   wherein the coupling element (6), the coupling groove (5) and the coupling bolt (4) are arranged and formed in such a way that in the mounted state on the coupling element (6) there is a tensile stress between the suspension projection (7) and the introduction projection (8), said tensile stress holding the coupling projection (3) in the coupling shaft (2) and holding the introduction projection (8) in a self-retaining manner in the coupling groove (5).
2. Connection arrangement according to claim 1, characterised in that the coupling bolt (4) is arranged on a portion, inserted into the coupling shaft (2), of the coupling projection (3), and the coupling projection (3) comprises a first opening (21) through which the suspension projection (7) can be introduced into the coupling shaft (2).
3. Connection arrangement according to either of the preceding claims, characterised in that the coupling projection (3) is formed in two parts, the two coupling projection parts (31, 32) being connected via the coupling bolt (4) and the first opening (21) being arranged between the two coupling projection parts (31, 32).
4. Connection arrangement according to any of the preceding claims, characterised in that the coupling shaft (2) comprises a second opening (22) through which the introduction projection (8) can be introduced into the coupling groove (5), the first and second openings (21, 22) in particular forming a shared opening (23) of the connection arrangement (1).
5. Connection arrangement according to any of the preceding claims, characterised in that the coupling element (6) and the coupling groove (5) together form a past-dead-centre clip, which is formed in such a way that a dead centre is passed when the suspension projection (7) is suspended as a result of the introduction projection (8) being inserted into the coupling groove (5).
6. Connection arrangement according to claim 5, characterised in that the coupling element (6) is formed rigid and the coupling groove (5) extends in such a way that the dead centre is passed when the introduction projection (8) is introduced into the coupling groove (5) as a result of flexible deformation of the coupling element (6).
7. Connection arrangement according to any of claims 1 to 4, characterised in that the coupling element (6) comprises a past-dead-centre lever (41), which is arranged and formed in such a way that the introduction projection (8) is introduced into the coupling groove (5) at least in part without exertion of force and pushed past the dead centre thereof to apply the tensile stress of the past-dead-centre lever (41).
8. Connection arrangement according to claim 7, characterised in that the past-dead-centre lever is provided on the introduction projection (8) and/or the axis of rotation (42) of the past-dead-centre lever (41) is provided so as to introducible into the coupling groove (5) and/or the suspension projection (7) is provided articulated to the past-dead-centre lever.
9. Connection arrangement according to either of preceding claims 7 and 8, characterised in that an actuation lever (43), suspendable on the coupling shaft (2) and articulated to the past-dead-point lever (41), is provided on the coupling element (6), and is arranged and formed in such a way that a dead point is passed when the actuation lever (43) is actuated.
10. Connection arrangement according to any of preceding claims 7 to 9, characterised in that the actuation lever (43) is suspendable on the coupling shaft (2) in a region (44) which in the mounted state is arranged in the region of the coupling bolt, the actuation lever (43) comprising a support face (45) for the suspension projection (7), said support face holding the suspension projection (7) inside the coupling shaft (2) at the level of the coupling bolt (4).
11. Connection arrangement according to claim 10, characterised in that the suspension projection (7) comprises, on the side remote from the coupling bolt (4) in the mounted state, a obliquely or convexly shaped surface (46), which is arranged in such a way that in an intermediate mounting state, in which the actuation lever (43) is suspended on the coupling shaft (2) and the introduction projection (8) is introduced into the coupling groove (5), the suspension projection (7) is raised upon contact between the surface (46) and the coupling bolt (4) as a result of the coupling projection (3) being introduced into the coupling shaft (2).
12. Connection arrangement according to claim 11, characterised in that the coupling projection (3) can be introduced into the coupling shaft (2) to such an extent that when the coupling projection (3) is introduced into the coupling shaft (2) the coupling bolt (4) passes below the suspension projection (7) in such a way that the suspension projection (7) takes on a pre-latched state as a result of falling down or snapping shut in the direction of the support face (45).
13. Seating (10), in particular an office swivel chair, comprising at least a backrest support (11) and a seat support (12), wherein the backrest support (11) is connected to the seat support (12) by means of a connection arrangement (1) according to any of the preceding claims.
14. Seating according to claim 13, characterised in that the seating (10) is in the form of a high-backed office swivel chair (10) comprising a backrest (17), at least one coupling projection (3) being provided on the seat support (12), the backrest support (11) being in the form of a backrest support (11) and the coupling shaft (2) being provided on the backrest support (11) and/or armrests comprising at least one backrest support (11) in the form of an armrest support (11) being provided and a coupling shaft (2) being provided on the armrest support (11).
15. Mounting method for attaching a backrest support (11) to a seat support (12), in particular comprising a connection arrangement (1) according to any of claims 1 to 12, comprising the steps of:

    a) providing a coupling projection (3), to which a coupling bolt (4) is fixed, a coupling shaft (2), on which a coupling groove (5) is provided, and a coupling element (6), which has a suspension projection (7) and an introduction projection (8);

    b) introducing the coupling projection (3) into the coupling shaft (2);

    c) suspending the suspension projection (7) on the coupling bolt (4);

    d) introducing the introduction projection (8) into the coupling groove (5);

    e) applying a tensile stress to the coupling element (6) between the suspension projection (7) and the introduction projection (8).

Images