EP2721962B1 - Dorsokinetic backrest of a seat, seating furniture - Google Patents

Description

FIELD OF THE INVENTION

The present invention relates to a dorsokinetic backrest of a chair, in particular an office swivel chair. The present invention further relates to a chair with a dorsokinetic backrest.

TECHNICAL BACKGROUND

Bearings for seating exist in various embodiments. A special type of storage of a seating furniture element on another piece of seating furniture constitute so-called elastomeric bearings. These elastomeric bearings serve the purpose of allowing a certain mobility in the bearing point in several and in particular in all rotational degrees of freedom.

Elastomeric bearings are e.g. used to connect a backrest to a seat support. An example of this is the office swivel chair manufactured and sold by the company Sedus Stoll AG under the name "black dot". When using such elastomeric bearings in backrests we also speak of dorsokinetisch flexible joints or dorsokinetic bearings. The tethered with such camps backrests are also referred to as dorsokinetic backrests. This type of backrest, like a human joint, aids in turning, sideways and back movements.

A dorsokinetic backrest is for example in the German patent application DE 100 48 779 A1 described. When they are placed on a rubber buffer two Vulcanized steel plates. The steel plates and the rubber sleeves have a central passage opening. One of the steel plates has on the side of the backrest carrier on a conical recess at the passage opening. Through the passage opening, a tapered pin engaging with the conical recess is connected to the seat back. Such an arrangement ensures the desired mobility of the elastomeric bearing and prevents, if the vulcanization dissolves, a fall of the backrest.
The DE 20 2011 050 776 U1 shows an office swivel chair with a backrest support and with a base plate, wherein between the backrest support and the base plate a common linear guide is provided, which is designed such that it allows a single degree of freedom of the base plate relative to the backrest support. Another example is out EP 0 308 538 A1 known.

SUMMARY OF THE INVENTION

Against this background, the present invention seeks to provide an improved dorsokinetic backrest.

According to the invention this object is achieved by a dorsokinetic backrest with the features of claim 1 and / or by a chair with the features of claim 13.

• Eine dorsokinetische Rückenlehne für ein Sitzmöbel, insbesondere für einen Bürodrehstuhl, mit einem Lehnenträger und mit einer Grundplatte, an welcher ein dorsokinetisches Lager vorgesehen ist, wobei zwischen Lehnenträger und Grundplatte eine gemeinsame Linearführung vorgesehen ist, welche derart ausgebildet ist, dass sie als einzigen Freiheitsgrad eine Höhenverschiebung der Grundplatte relativ zum Lehnenträger zulässt.
• Ein Sitzmöbel, insbesondere ein Bürodrehstuhl, mit einem Sitzträger, mit einer höhenverstellbaren dorsokinetischen Rückenlehne gemäß einem der vorstehenden Ansprüche, wobei am dorsokinetischen Lager ein Rückenlehnenrahmen angebracht ist und der Lehnenträger am Sitzträger anbringbar ist.

Accordingly, it is provided:

• A dorsokinetic backrest for a chair, in particular for an office swivel chair, with a backrest support and with a base plate on which a dorsokinetisches bearing is provided, wherein between the backrest support and the base plate, a common linear guide is provided, which is designed such that it allows a single degree of freedom of the base plate relative to the backrest support.
• A seating furniture, in particular an office swivel chair, with a seat support, with a height-adjustable dorsokinetic Backrest according to one of the preceding claims, wherein a backrest frame is attached to the dorsokinetic bearing and the backrest support is attachable to the seat support.

The idea underlying the present invention is to provide a height-displaceable relative to the backrest support base plate between the backrest support and the dorsokinetischen bearing. This is coupled via the dorsokinetic bearing with the backrest frame. By means of the linear guide, the base plate on the backrest carrier is the only degree of freedom adjustable in height. The linear guide represents a pentavalent bearing. Thus, the rotational degree of freedom about the linear axis is also defined.

The seating is preferably an office seating, especially an office swivel chair. The height displacement is to be understood as a displacement substantially perpendicular to a plane on which the seating stands. Angle positions to the vertical of up to 30 ° are conceivable. For example, an adjustability of the backrest of an office swivel chair with respect to the backrest angle or also a, in particular coupled with a synchronous mechanism, pivotability of the backrest is also conceivable. However, this is not realized via the connection between backrest support and base plate. If such functions are provided, they are realized with a mechanism between the backrest support and seat support of a chair. A synchronous mechanism is then provided in addition to the dorsokinetic backrest according to the invention, for example between backrest support and seat support.

The height of the backrest according to the invention can be locked, for example, with a lock in a desired position. Thus, the sixth degree of freedom of the translational adjustability in height direction can also be set be so that a statically determined storage of the base plate on the backrest support is possible.

The linear guide forms a rigid bearing in five degrees of freedom for the base plate, which is adjustable in a plurality of predetermined height positions. The rigid bearing is intended to realize the mobility of the dorsokinetic backrest essentially via the dorsokinetic bearing and not to be influenced by a mobility of the mounting of the base plate on the backrest support. Preferably, when the height adjustment is just not done, and the sixth degree of freedom of the vertical displacement releasably locked. Thus, the dorsokinetic backrest, apart from the dorsokinetic bearing, despite the height adjustment on a high rigidity, whereby the dorsokinetic bearing works as intended and can be designed ergonomically.

Thus, a very ergonomic and easily adaptable to different body sizes dorsokinetic backrest is provided on the whole.

As a further advantage, the final assembly of such a backrest is very simple. For example, it is conceivable that a chair with the backrest is delivered in a preassembled state. In the preassembled state z. B. the backrest support to the seat support of the chair. On the base plate, the dorsokinetische bearing is attached to which the backrest frame is attached. The backrest frame is preferably provided with a pad or a string membrane. The base plate now only has to be inserted into the linear guide for final assembly. The final assembly is thus without tools and can z. B. be made by an individual with a few assembly steps.

This also results in a logistical advantage in the delivery of the seat, because this is volume-optimized transportable in the non-assembled or pre-assembled state. In the non-assembled or preassembled 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 for the buyer, for example, as a home assembly or the seller before selling. The volume-optimized type of transport is thus favored by the ease of assembly. Alternatively, the ease of assembly allows shipping to a distributor to complete the final assembly at the point of sale rather than at the factory. Thus, transport volume is saved on delivery, which reduces transport costs. According to the invention, a common latching detent is provided between the backrest support and the base plate, which is designed to lock the baseplate relative to the backrest support at various predetermined positions of the linear guide. With the locking detent the sixth degree of freedom of height adjustment can be advantageously set easily and quickly. Furthermore, the locking detent is preferably detachable, so that the height position of the base plate is easily adjustable by releasing the locking detent to another predetermined position. To move the height of the base plate or to release the locking detent different mechanics, such as a releasable locking lever are conceivable. Furthermore, for example, also conceivable to provide a flexible locking lug, which when overcoming jumps over a predetermined latching force in a next predetermined detent position. If the locking catch is solved or overcome, the base plate, for example, can be moved manually relative to the backrest carrier. As an alternative to manual shifting, electrical adjustability is also conceivable, with the latching mechanism containing, for example, a toothed wheel which can assume various latching positions by rotating the toothed wheel.

According to the invention, the base plate in an unassembled or preassembled state for taking a preassembled state on the backrest support in such a way in the linear guide and the Rastarretierung that it is locked by height displacement of the base plate relative to the backrest support with the latching detent. Thus, the base plate must be introduced, for example, for final assembly of the chair only in the linear guide and moved in the vertical direction. The base plate is displaced in the vertical direction until the locking detent is locked at a first predetermined detent position of the base plate relative to the backrest carrier. The final assembly is thus tool-free and can be easily done, for example, by an individual with a few assembly steps. Advantageous embodiments and further developments will become apparent from the other dependent claims and from the description with reference to the figures of the drawing. According to an advantageous embodiment, the linear guide has at least three guide elements. The linear guide preferably has four guide elements. Furthermore, the linear guide has at least two guiding means which can be guided linearly with the guide elements. The guide means are designed such that they are easily guided in the guide elements, so that the linear guide is height adjustable with little effort. Preferably, the guide elements on the backrest support and the Guiding means provided on the base plate, wherein alternatively also a reverse assignment is possible. The guide elements may be formed, for example, as running grooves or hook-like projections or the like. The guide means are then formed, for example, as corresponding thereto, in the guide elements linearly executable guide rails. By the number of at least three guide elements a pentavalent bearing is realized. For example, the linear guide with three parallel aligned, longitudinally and transversely to each other staggered guide elements may be formed, wherein the respective guide means guided therein are rigidly interconnected. By this connection of the guide means the rotational degrees of freedom are set. Thus, a total of a pentavalent bearing is provided, which only allows a translational degree of freedom in the form of height displacement.

In an advantageous embodiment, a key or a lever is provided on the base plate, which is or is designed to release the locking detent. Thus, by releasing the lever or the button, the locking catch can be released and the base plate can be adjusted in height relative to the backrest support. This ensures that the height adjustment is not activated unintentionally. Preferably, the key or the lever is arranged in an easily accessible position, so that the adjustability is easy to accomplish. In this case, on the one hand positions, in particular for a lever, in question, which can be reached for easier and direct adjustability of a person sitting on the chair person. This has the advantage that the adjustment can be made relatively quickly and you do not have to get up to it. On the other hand, it is also conceivable to provide the position such that the person sitting on the chair person stands up to adjust the height of the seating and, for example, arranged on the back of the backrest Press key. This has the advantage that a high level of operating safety is ensured. Furthermore, the key can thus be provided directly in the area of the locking catch, whereby the complexity and the number of necessary parts decreases. It is also conceivable that both a button and a lever are provided by means of which the locking detent is operable.

According to a preferred embodiment, the locking detent on a plurality of in a row, in particular in a vertical row, arranged locking means. The orientation of the row is here to be understood as being essentially vertical, that is with angular deviations in the range of less than 15% to the vertical. As an angle adjustment in particular the slight back adjustment of the backrest comes into question, which can be useful for adapting the seat geometry to different body sizes. Further, the locking means are preferably provided on the backrest support and are thus pivoted with a pivoting of the backrest support. Due to the row-like arrangement of the locking means, a plurality of predetermined by the locking means height positions of the base plate can be advantageously taken relative to the backrest support.

According to a preferred embodiment, the latching means are formed as latching grooves, wherein preferably two rows of latching grooves are provided. These are in particular each at least partially disposed between two vertically spaced guide elements. Thus, for example, two linear guides are provided, wherein the guide means are coupled together and thereby the fifth degree of freedom is set. On each of the linear guides locking grooves are provided for setting the sixth degree of freedom. Alternatively, only a number of locking grooves could be provided.

In a preferred embodiment, a locking lever is provided on the base plate, which has a latchable in the locking grooves locking extension. By means of the locking lever thus the base plate can be locked with the locking grooves. For this purpose, the latching projection is inserted into a latching groove or locked with the same. For this purpose, the locking lever preferably has a spring preload which presses the latching extension into the latching groove. Alternatively or additionally, the spring preload can also be provided on the button or on the lever, via which or which of the locking lever can be operated. In this way, the spring bias of the button or the lever also acts on the locking lever.

In preferred embodiments, the backrest support has two substantially vertically oriented webs and a web connecting the webs, substantially horizontally oriented cross member. The webs have a trained for connection with a seat furniture section. The webs further comprise Höhenverstellabschnitte, which are arranged vertically and each comprise at least one guide element and a number of locking means. The guide elements and locking means are preferably formed integrally with the webs. Thus, the linear guide and the Rastarretierung run along the webs, which act simultaneously as structural support members and as linear guide elements. The webs may be additionally connected to a synchronous mechanism or an angular adjustment of the backrest carrier.

According to a preferred embodiment, the locking lever has a transverse axis and two latching extensions, which have a transverse distance corresponding to the distance of the height adjustment sections. The latching extensions are attached to the transverse axis. Thus, the locking lever with both Rastfortsätzen latched into the locking grooves of the two Höhenverstellabschnitte simultaneously. Advantageously, therefore, only the button or the lever needs to be operated in order to simultaneously lock or unlock the locking lever on both height adjustment sections.

According to an advantageous embodiment, the transverse axis is rotatably mounted in the base plate. Furthermore, the locking lever has a guided in the backdrop of the button or the lever guide arm. The slide and the guide arm are formed such that the lock lever releases the lock detent in a depressed state of the button or the lever and locked in a non-depressed state of the button or the lever. Thus, the locking lever can be locked and released via simple operation of the button or the lever. Furthermore, the key or the lever or its gate is designed such that the key or the lever in particular by a spring bias in the non-actuated or depressed state automatically assumes the locked position.

In preferred embodiments, an anti-fuse for securing the locking lever against unwanted rotation in the non-depressed state of the key or the lever is additionally provided. The anti-fuse is provided in particular as a support of the guide arm on a securing portion of the gate. This can for example be designed as a flat portion, which is aligned in the locked state normal to the necessary to release the locking lever rotational direction of the guide arm. Thus, the locking lever is locked in the locked state against unwanted rotation.

According to one embodiment, the guide elements are designed as guide rails projecting from the backrest carrier which sliding surfaces are provided. In particular, both the guide elements of the backrest support and the guide means of the base plate, in particular in one piece, are formed from aluminum. The sliding surfaces have in this case a corresponding preparation, which reduces the coefficient of friction. Preferably, sliding bearings are provided for this purpose on the sliding surfaces. These plain bearings can be provided, for example, as a plastic sleeve or also contain conventional plain bearing materials such as tin, bronze, brass, lead, ceramic and / or the like.

In a preferred embodiment, a cover is provided on the base plate on the backrest side, which is designed to cover the locking catch and in particular to hold the locking lever and the button on the base plate. For example, the cover can be provided at the same time as a kind of cover for the bearings or guides of the locking lever and the button on the base plate. Furthermore, a jamming protection is provided by covering the locking catch. Thus, the height adjustment of the dorso-kinetic backrest is easy to use feasible.

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 eines Sitzmöbels mit einer erfindungsgemäßen dorsokinetischen Rückenlehne;

Fig. 2

eine Seitenansicht eines Bürodrehstuhls mit einer dorsokinetischen Rückenlehne;

Fig. 3

eine Schnittdarstellung einer dorsokinetischen Rückenlehne durch eine vertikale Ebene;

Fig. 4

eine perspektivische Darstellung eines Lehnenträgers;

Fig. 5

eine Schnittdarstellung eines Lehnenträgers in einer Draufsicht durch eine horizontale Ebene;

Fig. 6

eine Explosionsdarstellung einer dorsokinetischen Rückenlehne in einer perspektivischen Ansicht von hinten;

Fig. 7

eine Explosionsdarstellung einer dorsokinetischen Rückenlehne ohne Rückenlehnenrahmen in einer perspektivischen Ansicht von vorne;

Fig. 8

eine Zusammenbauansicht mit einer Schnittdarstellung der dorsokinetischen Rückenlehne gemäß Fig. 7 ohne Abdeckung;

Fig. 9

die Anordnung gemäß Fig. 8 mit gedrückter Taste;

Fig. 10

die Anordnung aus Fig. 9 mit Abdeckung;

Fig. 11

eine Zusammenbauzeichnung der dorsokinetischen Rückenlehne gemäß Fig. 7-10 in einer perspektivischen zusammenbaudarstellung;

Fig. 12

eine perspektivische Darstellung von Arretierhebel und Taste;

Fig. 13

eine Schnittansicht in einer horizontalen Ebene durch die einzeln dargestellte Linearführung.

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 chair with a dorsokinetic backrest according to the invention;

Fig. 2

a side view of an office swivel chair with a dorsokinetic backrest;

Fig. 3

a sectional view of a dorsokinetic backrest through a vertical plane;

Fig. 4

a perspective view of a backrest support;

Fig. 5

a sectional view of a backrest support in a plan view through a horizontal plane;

Fig. 6

an exploded view of a dorsokinetic backrest in a perspective view from behind;

Fig. 7

an exploded view of a dorsokinetic backrest without backrest frame in a perspective view from the front;

Fig. 8

an assembly view with a sectional view of the dorsokinetic backrest according to Fig. 7 without cover;

Fig. 9

the arrangement according to Fig. 8 with pressed button;

Fig. 10

the arrangement Fig. 9 with cover;

Fig. 11

an assembly drawing of the dorsokinetic backrest according to Fig. 7-10 in a perspective assembly view;

Fig. 12

a perspective view of locking lever and button;

Fig. 13

a sectional view in a horizontal plane through the linear guide individually shown.

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 sketch of an office swivel chair 10 with a dorsokinetic backrest 1. This has a backrest support 2 and a base plate 3. The backrest support 2 is attached to a seat support 11 of the office swivel chair 10. Between the backrest support 2 and the base plate 3, a linear guide 5 is provided. On the base plate 3, a dorsokinetic bearing 4 is provided. The linear guide 5 between the backrest support and the base plate 3 is formed such that as a single degree of freedom F a height displacement of the base plate is permitted relative to the backrest support 2. Preferably, this height adjustment is made possible in predetermined positions. The predetermined positions are realized by the lock 6 shown schematically, which is designed as a latching detent 6. In this case, latching means can be latched in different height positions of the dorsokinetic backrest, so that the sixth degree of freedom F of the translatory displacement in the height direction of the base plate 3 relative to the backrest support 2 can be fixed by the lock in various positions. Thus, the dorsokinetic backrest 1 can be provided in particular statically determined in different height positions on the office swivel chair 10.

FIG. 2 shows a side view of an office swivel chair 10 with a dorsokinetic backrest 1. The office swivel chair 10 has a seat support 11. On the seat support 11 is coupled to the backrest support 2 synchronizing mechanism 12 is provided, via which the dorsokinetic backrest 1 is adjustable relative to the seat support with respect to its backrest angle. On the backrest support 2 a height-adjustable base plate 3 is provided, on which the dorsokinetic bearing 4 is mounted. The dorsokinetic bearing 4 is connected to a backrest frame 13, wherein the backrest frame 13 is pivotable relative to the base plate 3 by the flexibility of the dorsokinetic bearing to all rotational degrees of freedom. A tilted position of the dorsokinetic backrest is indicated by dashed lines. This position is achieved only by the flexible deformation of the dorsokinetic bearing 4. Any additionally provided pivoting of the backrest support 2 by the synchronizing mechanism 12 in this case has another pivot point which is arranged in the region of the seat support 11.

The synchronous mechanism 12 thus works independently of the dorso kinetics. In particular, the synchronizing mechanism 12 can only be used for presetting a backrest support bracket and locked in a preset position. Thus, a mobility of the dorsokinetic backrest is preferably determined solely by the dorsokinetic bearing. The height of the dorsokinetic backrest 1 is adjustable relative to the backrest support 2 due to the height displacement of the base plate 3. The characteristics of the height adjustment will be discussed in detail with reference to the following figures.

The office swivel chair, in addition to the dorsokinetic backrest on a seat 14, which is also coupled to the synchronizing mechanism. The seat support 11 is coupled to a swivel column 15 which is fixed to a chair cross 16. This swivel column 15 is preferably designed to be height adjustable, for example with a gas spring. At the chair cross 16 chair rollers 17 are provided which complete the office swivel chair 10.

FIG. 3 shows a sectional view of a dorsokinetic backrest 1. This has a backrest support 2, on which the base plate 3 is mounted vertically displaceable. On the base plate 3, a dorsokinetic bearing 4 is attached. This is connected to a backrest frame 13. In the illustrated embodiment, a through hole 18 is provided, through which a fastening bolt can be pushed from the backrest side through the base plate and through the dorsokinetic bearing, so that the backrest frame can be screwed to a part of the dorsokinetic bearing. Furthermore, the dorsokinetic bearing 4 can be fastened to the base plate-facing part with the same. For this purpose, for example, fastening screws 19 are provided. This allows the backrest frame 13 relative to the backrest support 2 by flexible deformation of the dorsokinetic bearing 4 move. In particular, movements about all rotatory degrees of freedom through the bearing point of the dorsokinetic bearing 4 are possible. Preferably, the dorsokinetic bearing 4 restricts mobility to a predetermined range of motion. Furthermore, the base plate 3 and thus also the dorsokinetic bearing 4 and the backrest frame 13 are provided adjustable in height relative to the backrest support 2.

FIG. 4 shows a perspective view of the backrest support 2. This has two substantially vertically extending webs 26 and a cross member 27, which connects the webs 26 together. At the webs 26 each Höhenverstellabschnitte 28 are provided. These have guide elements 21 and latching means 24, which are arranged in vertical rows 25. At each web 26, two guide elements 21, which are formed as a guide hook, also arranged substantially vertically. The row 25 of locking elements 24 designed as latching grooves is provided at least partially between the two guide elements 21 on each of the webs 26. The backrest support 2 also has in each case on both webs 26 a substantially horizontally extending, provided for attachment to a seat support 11 section 22. The transition between the webs 26 and the portion 22 of the back support 2 is provided with a radius, wherein the entire back support 2 with the sections 22, the webs 26 and the cross member 27 is preferably formed in one piece. The guide elements 21 can either be provided by casting during the prototyping of the backrest support 2 or subsequently, for example, attached in a materially bonded manner or fastened to the webs 26 with fastening elements. The locking grooves 24 can also be used during prototyping or subsequently, for example by machining the webs 26, be introduced in the height adjustment sections 28.

FIG. 5 shows the backrest support FIG. 4 in a sectional view from above, that is, in a plan view of a section through the guide elements 21. In this illustration, the guide elements 21 are integrally formed with the webs 26. The intended for attachment to the seat support portions 22 are shown in a plan view accordingly. In the region of the section through the webs 26 and the guide elements 21, the web 26 is formed integrally with the guide element 21.

FIG. 6 now shows the entire dorsokinetic backrest 1 in an exploded view in a perspective view from behind. The backrest support 2 represents the rearmost element of the dorsokinetic backrest 1, and is designed as a structural support of the dorsokinetic backrest 1. Further, a back cover 35, a button 33, a lock lever 31, the base plate 3, the dorsokinetic bearing 4, a pinch protection ring 36 and the seat back frame 13 are shown. In the assembled state of the dorsokinetic backrest 1, the dorsokinetic bearing 4 is fixedly attached to the backrest frame 13 with the interposed anti-pinch ring 36. For this purpose, a first backrest frame facing mounting portion is provided on the dorso-kinetic bearing 4. Further, a second attachment portion is provided on the dorsokinetic bearing 4, which faces the base plate 3. With the second attachment portion, the dorsokinetic bearing 4 is fixed to the base plate 3 on the base plate side. Within the dorsokinetic bearing 4, an elastomeric body is provided, which is coupled to both attachment portions. Thus, a dorsokinetic mobility is realized between the backrest frame 13 and the base plate 3. At the back the base plate 3 is the same height-adjustable coupled to the backrest support 2 via a linear guide 5. Interposed between the base plate 3 and backrest support 2, the locking lever 31, the button 33 and the cover 35 are arranged. On the base plate 3 guide means 23 are provided, which engage with guide elements 21 of the backrest support 2. In the illustrated embodiment, the guide elements 21 of the backrest support 2 are formed such that they reach through the cover 35 and engage in the guide means 23 of the base plate 3. The locking lever 31 and the key 33 are inserted into the base plate 3. They are held on the base plate 3 by fixing the cover 35 to the base plate 3. The key 33 is supported by springs 37 on the base plate 3 and thus arranged resiliently displaceable against the base plate 3. The locking lever 31 is rotatably mounted in the base plate 3 and coupled kinematically with the key 33, that pressing the button 37 causes a rotational movement of the locking lever 31. This is related to FIG. 12 discussed in detail. Overall, therefore, the base plate 3 together with the dorsokinetischen bearing 4, and the cover 35 is provided on the backrest support 2 höhenverschieblich.

FIG. 7 shows the exploded view FIG. 6 in a front view without the backrest frame 13. The dorsokinetic bearing 4 is shown here by its backrest frame 13 facing side. On this side, the through hole 18 is provided, via which the dorsokinetic bearing 4 on the backrest frame 13 with the first attachment portion can be fastened.

The clamping protection ring 36 is formed with a toothing, which serves to prevent rotation on the backrest frame 13. He is as anti-trap in a pivoting movement of the Dorsokinetic bearing 4 provided and disposed between the backrest frame 13 and the dorsokinetic bearing 4.

The base plate 3 is shown in this view with its intended for attachment of the dorsokinetic bearing 4 front surface, wherein through holes for attaching the mounting screws 19 are provided for fixing the dorsokinetischen bearing 4. At the back of the base plate 3, the button 33 with the springs 37 is resiliently mounted up against the base plate 3 pressed on the same. Further, the locking lever 31 is rotatably mounted in the base plate 3 and coupled kinematically with the key 33 via a link 41.

The cover 35 has the purpose of covering the linear guide 5 and the locking latch 6, and the back of the base plate 3. It thus assumes the same holding and laminating. Furthermore, the cover 35 has an important safety function, because it serves as anti-pinch when Höhenverstellen the dorsokinetic backrest 1. To improve the smoothness of the linear guide 21 sliding bearings 29 are provided in addition to the guide elements, which reduce the friction on the guide elements 21 when Höhenverstellen the base plate 3 , In particular, these are provided as plastic sleeves. Slide bearings are particularly advantageous if both the backrest support 2 and the base plate 3 are formed of aluminum. A friction pair of two aluminum parts without friction bearing has a high coefficient of friction. This is greatly reduced by the sliding bearing 29, so that the vertical displacement can be performed with low frictional resistance. The arrangement of the sliding bearing 29 is with respect to Fig. 13 described in more detail.

FIG. 8 shows the arrangement FIG. 7 in a perspective assembly view, with a section along a web 26 of the backrest support 2. In this case, the formation of the Rastarretierung 6 is shown in detail. The locking grooves 24 are provided in a vertical row 25 on the web 26. On the base plate 3, the locking lever 31 is rotatably mounted, and rotatable with the key 33 by pressing the button 33 relative to the base plate 3 and the backrest support. During a rotational movement of the locking lever 31, a latching extension 32 of the locking lever 31 can be latched or released with the latching grooves 24. At one in the FIG. 8 illustrated initial position of the button 33, in which it is pushed away from springs 37 of the base plate, the latching extension 32 is locked with one of the locking grooves 24.

By pressing the button 33, the in FIG. 9 illustrated state taken in which the locking lever 31 is rotated relative to the base plate 3 and the backrest support 2 and the latching projection 32 is lifted out of the locking groove 24. To release the lock, press the button upwards. In this state, the base plate 3 can be moved vertically relative to the backrest support 2. By releasing the button 33, the lever 31 is rotated back into the starting position, the latching extension locked with a locking groove 24 and thus locks the latch 6.

The preceding ones FIGS. 8 and 9 are shown without the cover 35 for better representation of the locking mechanism. In FIG. 10 is the arrangement off FIG. 9 shown again with the cover 35, which covers the back of the base plate 3.

In FIG. 11 is the dorsokinetic backrest according to the Fig. 7-10 shown in a perspective assembly view without a section. According to the invention with this arrangement provided in the holder of the dorsokinetic bearing or in the backrest height adjustment of a dorsokinetic backrest.

FIG. 12 shows a detailed representation of the key 33 and the locking lever 31 to illustrate their kinematic coupling. The locking lever 31 has latching extensions 32, a transverse axis 34 and guide arms 42. The button 33 has a link 41 and a counter-lock 43. The anti-fuse 43 is in the form of a vertical surface. In the initial position of the key 33, in which the locking lever 31 engages with its latching extension 32 in a latching groove 24, the guide arm 42 abuts on the counter-lock 43. Thus, an inadvertent rotation of the locking lever 31, which could lead to the opening of the lock, effectively prevented. To rotate the locking lever 31 and thus to open the lock, the key 33 is displaced upward in the height direction, as indicated by the arrow 44. By this height displacement of the guide arm 42 slides in the slot 41 and is offset with increasing height displacement of the key relative to the transverse axis 34 which is stationary of the base plate 3, mounted in the circumferential direction. This offset leads to a rotation of the transverse axis 34, which is indicated by the rotary arrow 45. As a result of this rotation, the latching extension 32 is lifted out of the latching groove 24 and thus the latch is opened. In this position, the dorsokinetic backrest can be adjusted in height by shifting the height of the base plate. When you release the button 33 the same is pressed by not shown, provided between the base plate 3 and the key 33 springs 37 back down. The guide arm 42 is then moved along the guide 41 again to the counter-lock 43, whereby the locking lever 31 is rotated back into the starting position and thus locked with a locking groove 24 on the latching extension 32. In this position is the locking catch 6 locked. The illustrated combination of a button 33 and a locking lever 31 thus represents a very easy-to-use and a very safe operation arrangement for the locking device 6.

FIG. 13 shows a detailed view of the linear guide 5 in a horizontal sectional plane. The linear guide 5 is provided with a guide piece 21 integrally provided on the web 26, designed as a guide hook, a guide means 23 provided on the base plate 3 and a slide bearing 29 provided between guide means 23 and guide element 21. The sliding bearing 29 is designed as a plastic sleeve and surrounds the guide element 21 at all standing in contact with the guide means 23 surfaces. The sliding bearing 29 is provided clipped to the guide member 21. The guide means 23 is formed as a slide bearing 29 comprehensive rail and provided integrally on the base plate 3. The linear guide determines at least the two translatory degrees of freedom, which are normal to the height direction of the linear guide. In the illustrated arrangement, the direction of the height displacement corresponds to a shift in the plane of the drawing or out of the plane of the drawing.

A same, mirror-inverted linear guide 5 is provided on the second web 26. Further, in the linear direction offset on two webs 26, a further pair of linear guides 5 is provided. As a result, the rotational degrees of freedom of the base plate are set relative to the backrest support. Overall, a pentavalent bearing is thus provided, which allows a single degree of freedom of the base plate 3 relative to the backrest support 2 as a single degree of freedom and ensures a very rigid connection between backrest support 2 and base plate 3.

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, instead of the locking lever, a motor-adjustable locking device can be provided.

The linear guide could be provided as a single linear guide with a rotational degree of freedom about the linear axis limiting training. For example, a running with a low tolerance in a square guide square tube is conceivable.

Accordingly, a design of the backrest carrier with only one web is conceivable, provided that it is sufficiently rigid.

Instead of the plain bearings, a linear guide of the guide means in the guide elements with roller bearings is conceivable.

LIST OF REFERENCE NUMBERS

1

dorsokinetic backrest

2

backrest support

3

baseplate

4

dorsokinteischen camp

5

linear guide

6

locking means

10

Office chair

11

seat support

12

synchronous mechanism

13

Backrest frame

14

seat

15

Swivel chair column

16

chair cross

17

Castor chair

18

Through Hole

19

fixing screw

21

guide elements

22

section

23

guide means

24

locking grooves

25

vertical row

26

Stege

27

crossmember

28

Höhenverstellabschnitte

29

bearings

31

locking lever

32

Latching extension

33

button

34

transverse axis

35

cover

36

Terminal protective ring

41

scenery

42

guide

43

safety section

44

arrow

45

rotation arrow

Claims (13)

1. Dorsokinetic backrest (1) for a seating furnishing (10), in particular for an office swivel chair,
   comprising a rest support (2) and comprising a baseplate (3) on which a flexibly deformable dorsokinetic bearing (4) is provided,
   comprising a backrest frame (13), which is connected to the dorsokinetic bearing and which is pivotable through all rotational degrees of freedom relative to the baseplate (3) as a result of the flexibility of the dorsokinetic bearing (4),
   wherein a shared linear guide (5) is provided between the rest support (2) and the baseplate (3), and is formed in such a way that it allows a vertical displacement of the baseplate (3) relative to the rest support (2) as the sole degree of freedom (F), wherein a shared latching locking device (6) is provided between the rest support (2) and the baseplate (3) and is formed to lock the baseplate (3) relative to the rest support (2) in various predetermined positions of the linear guide (5), and wherein the baseplate (3), in an unmounted or pre-mounting state, can be introduced into the linear guide (5) and the latching locking device (6) so as to take on a state mounted on the rest support (2), in such a way that it is locked by means of the latching locking device ( 4 ) by vertically displacing the baseplate (3) relative to the rest support (2).
2. Backrest according to claim 1,
   characterised in that
   the linear guide (5) comprises at least three guide elements (22), in particular four guide elements (22), and comprises at least two guide means (23) which can be guided linearly together with the guide elements (22).
3. Backrest according to either claim 1 or claim 2, characterised in that
   a button (33) or lever is provided on the baseplate (3) and is formed to release the latching locking device (6).
4. Backrest according to any of claims 1 to 3,
   characterised in that
   the latching locking device (6) comprises a plurality of latch means (24) arranged in a row, in particular in a vertical row (25).
5. Backrest according to claim 4,
   characterised in that
   the latch means (24) are formed as latch grooves (24), in particular at least two rows (25) of latch grooves (24) being provided, which in particular are arranged at least in part between two guide elements (21) which are vertically spaced apart.
6. Backrest according to claim 5,
   characterised in that
   a locking lever (31) is provided on the baseplate, and comprises a latch projection (32) which can latch into the latch grooves (24).
7. Backrest according to any of claims 4 to 6,
   characterised in that
   the rest support comprises two substantially vertically orientated webs (26) and a substantially horizontally orientated transverse strut (27) connecting the webs (26), the webs (26) being formed for connection to a seating furnishing support (11) and comprising vertically arranged height-adjustment portions (28) which each comprise at least a guide element (21) and a row (25) of latch means (24).
8. Backrest according to claim 7,
   characterised in that
   the locking lever (31) comprises a transverse axle (34) and two locking projections (32) which are at a transverse distance corresponding to the distance between the height-adjustment portions (28).
9. Backrest according to claim 8,
   characterised in that
   the transverse axle (34) is mounted rotatably in the base plate (3), and the locking lever (31) comprises a guide arm (42) which is guided in a slide (41) of the button (33) or lever, the slide and the guide arm being formed in such a way that the locking lever (31) releases the latching locking device (6) in a depressed state of the button (33) and locks it in an undepressed state of the button (33).
10. Backrest according to claim 9,
    characterised in that
    a securing means is provided for securing the locking lever (31) against undesired rotation in the undepressed state of the button (33) or lever.
11. Backrest according to any of claims 4 to 10,
    characterised in that
    the guide elements (21) are formed as guide hooks (21) which protrude from the rest support and on which sliding surfaces are provided.
12. Backrest according to any of claims 1 to 11,
    characterised in that
    a cover (35) is provided on the rest support side of the baseplate (3) and is formed to cover the latching locking device (6) and in particular to hold the locking lever (31) and the button (33) on the baseplate (3).
13. Seating furnishing (10), in particular an office swivel chair (10),
    comprising a seat support (11),
    comprising a height-adjustable dorsokinetic backrest (1) according to any of the preceding claims,
    wherein a backrest frame is attached to the dorsokinetic bearing, and the rest support (2) can be attached to the seat support (11).

Images