EP0884964B1 - Chair, specially an office chair - Google Patents

Abstract

A chair is disclosed, specially an office chair (100) the height and inclination of which can be adjusted, comprising essentially a supporting body (20) affixed to a back column (15), a swiveling member (40) placed thereon on the knee side, a swiveling seat support (45) pivoting on a first joint area (1) on the knee side as well as a backrest support (75) acting in conjunction with the seat support by means of a second joint area (2), said backrest support being coupled to a third joint area (3) by the supporting body (20). The backrest support (75) is placed via sliding rings mounted thereupon (85, 85') on a slide guide(35, 35') shaped as a circular arc, wherein the slide guides are placed between the first joint area (1) on the knee side and the back column (15) on the supporting body (20). The forced swiveling movement along the slide guide (35, 35') of the backrest support (75) and of the seat support (45) acting in conjunction therewith may be blocked and released again at any of multiple desired positions by means of a locking mechanism (65) that can be engaged with the backrest support (75) mounted on the supporting body (20).

Description

The invention relates to a chair, in particular to an office chair adjustable in height and inclination from one supported on a pedestal and with at least an arcuate in the direction of pivot Support body provided with cam track, one on the knee and transversely to the seat direction arranged on it in the form of a pivot axis a first joint point with at least one assigned Spring element, one against the restoring force of the same first articulation point swiveling seat support and an over a second articulated backrest support, which for the relative to the support body in the seat direction oriented pivoting movement via a third joint coupled with it.

From the publication DE 93 15 337 U1, one in height and Inclination adjustable office chair is known, which one arranged a pedestal and with an approximately circular arc Support arm provided with a guideway, one on the knee side seat brackets arranged thereon and one mounted thereon Includes backrest support, the seat support via a Steering lever and a first one on the knee on the seat support Gas spring and the backrest support via a second Gas pressure spring each on one mounted in the guideway Sliding element are supported. The depending on the Guideway-oriented movement of the seat carrier as well as the independent and relatively oriented movement of the backrest support takes place continuously against the restoring force the assigned in any position lockable Gas Spring.

An office chair is known from EP-A 0 539 733 B1, which one mounted on a pedestal and in the direction of the knee-side end oriented support body, an arranged thereon Seat support and one with a backrest and with provided at least one arcuate guide part Backrest support, which with the circular arc Section below the seat support at two at a distance bearing journals arranged with respect to one another and stationary on the supporting body is led. With this office chair, the backrest support and the seat support so independently moved that when moving back to the rest position of the backrest support slightly stronger in relation to the seat support is lowered.

Another office chair is known from DE-A 2 642 091, which is a pedestal, a supporting body arranged thereon for a seat plate and one with a backrest Backrest support, which with a molded and approximately arcuate section in an analog circular recess of the Carrier body is guided. To achieve an inclination-dependent Adjustment movement is the backrest support with the circular arc-shaped section slidable in the recess and detectable accordingly.

The invention is based, for a chair according to the task the genus mentioned in the preamble of claim 1 a space-saving and simple, constructive and economical producible design of the functional elements specify by means of which with small relative movements ergonomic, ergonomic movement of the seat carrier and the associated backrest support and under Maintaining a comfortable and safe sitting position work or rest position freely selectable by the user (Relax position) is adjustable.

According to the invention, this object is achieved in that which in dependence on the circular arc curve Seated backwards and forwards Pivotal movement by a arranged on the support body and locking mechanism that can be brought into engagement with the backrest support lockable in several positions of your choice and is releasable.

The special arrangement and design of the articulation points in Connection with the individual functional elements guaranteed that with the backward swiveling movement of the Seat support with the seat in relation to the one connected to it Backrest support is pivoted less and thus the respective users in the end position as well as in any lockable position always has a safe seating position and feels.

Further features of the invention result from the following Description in connection with the claims and the drawing.

Fig.1

einen in schematischer Seitenansicht und als erstes Ausführungsbeispiel dargestellten Bürostuhl in der Sitz- und Arbeitsposition;

Fig.2

den um eine horizontale Schwenkachse geschwenkten und in einer rückwärts geneigten Ruheposition dargestellten Bürostuhl gemäss Fig.1;

Fig.3

den schematisch in Draufsicht und in grösserem Massstab dargestellten Bürostuhl gemäss Fig.1 mit den wesentlichen Funktionselementen;

Fig.4

eine als erstes Ausführungsbeispiel dargestellte und an einem Tragkörper angeordnete Kulissenführung für die Schwenkbewegung des Bürostuhls gemäss Fig.1;

Fig.5

eine als erstes Ausführungsbeispiel dargestellte Rastermechanik für den Bürostuhl gemäss Fig.1 in festgestellter Position;

Fig.6

die in einer Freilaufstellung dargestellte Rastermechanik gemäss Fig.5;

Fig.7

die in einer Vorwahlstellung dargestellte Rastermechanik gemäss Fig.5;

Fig.8

eine als Ausführungsbeispiel dargestellte Spannmechanik für die horizontale Schwenkachse des Bürostuhls gemäss Fig.1;

Fig.9

ein in Draufsicht sowie in grösserem Massstab dargestelltes Teilstück der knieseitigen horizontalen Schwenkachse für den Bürostuhl gemäss Fig.1;

Fig.10

das gemäss der Linie A-A in Fig.9 im Schnitt dargestellte Teilstück der horizontalen Schwenkachse;

Fig.11

einen in schematischer Seitenansicht und als zweites Ausführungsbeispiel dargestellten Bürostuhl in der Sitz- und Arbeitsposition;

Fig.12

den in Draufsicht sowie in grösserem Massstab dargestellten Bürostuhl gemäss Fig.11 mit den wesentlichen Funktionselementen;

Fig.13

ein gemäss der Linie B-B in Fig.11 im Schnitt dargestelltes Teilstück des Bürostuhls mit einer am Rükkenlehnenträger angeordneten Kulissenführung sowie einer Rastermechanik;

Fig.14

ein gemäss der Linie C-C in Fig.13 im Schnitt dargestelltes Teilstück des in Arbeitsstellung dargestellten Bürostuhls gemäss Fig.11 mit der am Rückenlehnenträger angeordneten Kulissenführung für die Schwenkbewegung;

Fig.15

das um eine knieseitige horizontale Schwenkachse in eine Neigungsstellung geschwenkte Teilstück gemäss Fig.14;

Fig.16a

die teilweise im Schnitt dargestellte Rastermechanik für den Bürostuhl gemäss Fig.11 in der in Sitz- und Arbeitsstellung arretierten Position;

Fig.16b

die in der Freilaufstellung dargestellte Rastermechanik gemäss Fig.16a; und

Fig.16c

die in arretierter Positon dargestellte Rastermechanik für den Bürostuhl gemäss Fig.11 in rückwärts geneigter Stellung.

Embodiments of the invention are described below with reference to the drawing. It shows:

Fig.1

an office chair shown in a schematic side view and as the first embodiment in the sitting and working position;

Fig.2

the office chair pivoted about a horizontal pivot axis and shown in a backward inclined rest position according to FIG. 1;

Figure 3

the office chair shown schematically in plan view and on a larger scale according to Figure 1 with the essential functional elements;

Figure 4

a guide shown for the pivoting movement of the office chair according to Fig.1 shown as a first embodiment and arranged on a support body;

Figure 5

a locking mechanism shown as a first embodiment for the office chair according to Figure 1 in the locked position;

Figure 6

the raster mechanism shown in a free-running position according to Figure 5;

Figure 7

the locking mechanism shown in a preselection position according to Figure 5;

Figure 8

a clamping mechanism shown as an embodiment for the horizontal pivot axis of the office chair according to Fig.1;

Figure 9

a portion of the knee-side horizontal pivot axis for the office chair according to Fig.1 shown in plan view and on a larger scale;

Figure 10

the section of the horizontal pivot axis shown in section along the line AA in FIG. 9;

Figure 11

an office chair shown in a schematic side view and as a second embodiment in the sitting and working position;

Figure 12

the office chair shown in plan view and on a larger scale according to Figure 11 with the essential functional elements;

Figure 13

a section of the office chair shown in section along the line BB in FIG. 11 with a link guide arranged on the backrest support and a raster mechanism;

Figure 14

a section along the line CC in Figure 13 shown in section of the office chair shown in the working position according to Figure 11 with the slide guide arranged on the backrest support for the pivoting movement;

Figure 15

the section pivoted about a knee-side horizontal pivot axis into an inclination position according to FIG. 14;

Figures 16A

the partially shown in section mechanism for the office chair according to Figure 11 in the locked position in the sitting and working position;

Fig.16b

the grid mechanism shown in the freewheeling position according to FIG. 16a; and

Fig.16c

the locking mechanism shown in locked position for the office chair according to Fig. 11 in a backward inclined position.

In the drawing is a chair, especially one with regard to shown office chair adjustable in height and inclination, which is described below in connection with the achievement of the Adjustment movements and locking of the movements provided Functional units and to explain the interaction of the individual functional units described in detail becomes.

In Figures 1 to 3 is the first embodiment of the according to the invention and designated as a whole by 100 Office chair shown, which in Fig.1 in a schematic side view and in working position, in Fig.2 in schematic Side view and against the effect of at least one knee side arranged in a horizontal swivel body 40 Torsion element in a backward inclined position (relax position) and shown in Figure 3 in a schematic plan view is. The individual functional units are shown in FIGS. 4 to 10 to achieve the adjustment movement and the locking of the movements mentioned.

The office chair 100 essentially comprises, as shown in FIG a seat 10, a pedestal 15, one mounted thereon Support body 20 and in the knee area on the Carried body 20 and with the not shown here Torsion element provided swivel body 40. On the swivel body 40 is a seat support 45 and an associated one and arranged on the support body 20 backrest support 75. The backrest support 75 serves to receive one schematically shown and designated in the entirety with 90 Backrest arranged on a support arm 92 Upholstery part 91. Between the backrest-side surface 10 "of the seat 10 and the lower edge 91 'of the cushion part 91 is a functionally connected with an adjustment mechanism, not shown Push button 93 arranged. By pressing the Push button 93 can cushion member 91 relative to the seat 10 can be adjusted in height in the double arrow direction H.

The arrangement of the push button 93 on the inside of the support arm 92 between the seat 10 and the lower edge 91 'of the cushion part 91 has the advantage that the push button 93 of the users sitting on the office chair 100 easily with one Hand operated from left or right and with the other hand the cushion part 91 is adjusted in height according to the requirements can be. The special configuration of the preferably adjustment mechanism integrated in support arm 92 is not Subject of this invention and therefore not shown in detail and described.

The seat support 45 is operatively connected to the swivel body 40 on the knee side by means of the one designated as the first articulation point 1 Swivel body 40 mounted on the support body 20. In the backrest side The seat bracket 45 is close to a range the standing column 15 and with respect to that arranged on the backrest side second joint point 2 on the backrest support 75 stored. The backrest support 75 has two in the direction of support arms 77 and 77 ', which each have a between the column 15 and the third articulation point arranged on the knee-side swivel body 40 3 are mounted on the support body 20. The above generally mentioned elements, namely the seat 10, the pedestal 15, the support body 20, the swivel body 40, the seat support 45 and the backrest support 75 as well as those operatively connected to it Functional parts and the special design of joints 1, 2 and 3 are described in detail below described.

The knee joint 1 forms, as shown in Fig.3, together with the swivel body 40 a largely horizontal over the entire width of the seat 10 Swivel axis X-X.

The seat designated as a whole by 10 has a seat plate 14 and a non-illustrated manner thereon attached padding 11. The seat 10 is by means of bearing blocks 12 spaced apart from one another and 12 'are arranged on the seat support 45. The special shape and configuration of those provided with the padding 11 Seat plate 14 is not the subject of this invention and therefore not described in detail.

The standing column 15 partially shown in FIG. 1 has a Standpipe 17, in which a schematically shown and with an actuating mechanism 60 gas pressure spring operatively connected 16 is arranged. The elements mounted on the pedestal 15 of the office chair 100 can Y in the double arrow direction a vertical axis 15 'rotated and by means of the gas pressure spring 16 adjusted in the direction of the double arrow Z and in with respect to the floor can be locked at any height. The with the gas spring 16 operatively connected and mentioned above Actuating mechanism 60 will be described later in connection with Fig.4 described.

The in Fig.1 and Fig.2 in a schematic view and in Fig.3 Carrying body 20 shown in plan view has one for storage of the pedestal 15 and formed with a bearing housing 23 (Fig.4) provided head piece 25, two with respect to an axis of symmetry S-S arranged at a parallel distance from each other Side walls 21 and 21 ', which by a starting from the Headpiece 25 in the direction of the knee-side swivel body 40 oriented floor 24 are interconnected. The floor 24 is in the area of the third joint 3 with a Bottom 24 penetrating recess 24 '(Fig.3). In the recess 24 'is one with means not shown attached, for example on one side wall 21 'of Support body 20 by a screw connection or the like attached grid mechanism 65 arranged. In the front, knee side Area of the support body 20 is still a molded Support bearing 30 is provided, to which one after Connects bent end wall 26 above. The support bearing 30 serves to receive and store one with a tensioning wheel 58 operative clamping mechanism 55. The following in connection 8 with clamping mechanism 55 described in more detail due to the rotation about the axis 59 'in the direction of the arrow Y' Tensioning wheel 58 actuated (Fig.1).

The special arrangement and design of the individual articulation points 1, 2 and 3 on the individual elements that with an oriented in the direction of arrow P (Fig.1) Pivotal movement of the backrest 90 through an angle α and Backrest support 75 and the seat support connected to it 45 and seat 10 from the rest and working position (Fig.1) with an angle α 'in the inclined or lowered position (Relax position) is moved (Fig. 2). Because of the special arrangement and training of the individual functional elements achieved that the angle α 'is about half as large as that Angle α.

In a preferred arrangement and training of the individual functionally connected functional elements are the backrests pivoted with the angle α of about 24 ° and the seat carrier 45 with the seat 10 angle α 'lowered by approximately 12 °. Experiments have shown that this is inclined backwards Position of each user still a pleasant and emotionally safe sitting position and also feels.

In Figure 3, the office chair 100 is enlarged and in a schematic Top view shown and you can see that on the axis of symmetry S-S arranged and with the head piece 25 in not shown in detail on the column Support body 20, which is two in the knee area at a distance to each other on the side walls 21, 21 'and has schematically illustrated bearings 27,27 '. Camps 27, 27 'are arranged to accommodate the S-S transverse to the axis of symmetry and essentially forming the pivot axis X-X Swivel body 40 formed. You can also see in Fig. 3 two trained to support the backrest support 75 and Guide rails arranged at a distance from the swivel axis X-X 35 and 35 ', which in the illustrated embodiment the side walls 21 and 21 'of the cantilever-shaped support body 20 are arranged. The one link guide 35 is below described in more detail in connection with Figure 4.

The with respect to the axis of symmetry S-S on both sides of the Carrying body 20 arranged guide rails 35,35 ' trained in the form of an independent component and in not shown on the side walls 21,21 'of Support body 20 are attached. In a not shown Variants can be the backdrop guides 35, 35 'also as one in the respective side wall 21 and 21' incorporated, not shown recess or depressions or delimited by the side walls 21 and 21 ' the like.

As shown in Figure 3 is further on the knee Swivel body 40 of the seat support 45 arranged and not attached means attached. The seat support 45 has, for example two from the sections 49.49 'and 48.48' and 47,47 'formed longitudinal beams 45' and 45 ", in which the two sections 49, 49 'fastened to the swivel body 40 through those oriented obliquely in the direction of the symmetry axis S-S Pieces 48,48 'with the parallel distance to Axis of symmetry S-S arranged sections 47,47 'connected are. The backrest support 75 has two at a parallel distance support arms 77 and arranged to the axis of symmetry S-S 77 ', which in the backrest area by a first Intermediate piece 76 and approximately in the area of the third joint point 3 connected to each other by a second intermediate piece 80 are. This as a grid element corresponding to the swivel movement second intermediate piece 80 formed approximately in a circular arc is with the raster mechanism 65 arranged on the support body 20 Can be engaged for different seating positions. A first one Embodiment of the raster mechanism 65 is shown below described in connection with Figures 5 to 7.

On the two support arms 77 and 77 'of the backrest support 75 are two spaced from each other and as Articulated bolts 78,78 'and 79,79' trained bearing parts arranged and attached in a manner not shown. The both forming the third joint 3 and corresponding are arranged first hinge pins 79,79 'to each other with a respective slider 85 and 85 'in the associated guide 35,35 'mounted. The both forming and corresponding to the second articulation point 2 are arranged to each other second hinge pins 78,78 ' via the parts 47 and 47 'of the seat support 45 provided bearing blocks 12 'connected to the seat plate 14. On the seat support 45 can continue, as in Fig.1 and Fig.3 shown schematically, a cross member 13 for storage and Attachment of armrests, not shown, can be arranged. The actuating mechanism is on the support body 20 in the area of the head piece 25 60 arranged by means of which the in the Stand column 15 (Fig.1) arranged gas pressure spring 16 actuated can be. The actuating mechanism 60 is in a corresponding trained recess on the head piece 25 of the support body 20 stored and is described below with reference to Figure 4.

Fig. 4 shows a section shown on a larger scale along the line IV-IV in Figure 3 with the one on the one Side wall 21 of the cantilevered support body 20 arranged Link guide 35 and a section of the actuating mechanism 60. The link guide 35 has two in parallel Distance from each other and essentially circular arc trained guide bars 36 and 37. The guide bars 36,37 are in the illustrated embodiment on the the pivot axis X-X (Fig.3) facing end by a first End stop 39 connected together. In the of the two spaced guide webs 36, 37 formed cam track 38 is that on the axle beam 79 of the backrest support 75 (Fig.3) mounted slider 85. At a variant not shown in more detail there is the possibility that on the support arms 77.77 'of the backrest support 75 each a sliding block 85.85 'is formed, the individual Sliding block 85,85 'in the assembled state with the associated Link guide 35,35 'is engaged. The along the arcuate curved path 38 in the double arrow direction R-oriented movement of the sliding blocks 85, 85 'takes place each around an imaginary center D along a theoretical Center line R '(Fig.4).

The link guide 35 and 35 'is designed and on the support arms 77, 77 'of the backrest support 75, that they each form the arcuate curved path 38. The imaginary center point D for the circular arc 38 of the link guide In this embodiment, 35, 35 'is above the supporting body 20 arranged. Preferably the imaginary center is D arranged such that it is in the working position of the chair 100 between the surface 9 of the support body 20 and the facing and essentially horizontal oriented underside 9 'of the seat support 45 is located (Fig.1).

With the swivel movement oriented in the double arrow direction R. of the backrest support 75 slide on the two hinge pins 79 and 79 'of the support arms 77 and 77' mounted sliders 85 and 85 'along the inner sliding surfaces 36' and 37 'of the two guide webs 36 and 37. The one on the opposite Side wall 21 'of the support body 20 arranged and link guide 35 ', not shown, is analogous the backdrop guide 35 described above. In each of the two slide guides 35, 35 'one in Double arrow direction R oriented movement of the sliders 85,85 'limiting Stop 86 can be arranged. The stop 86 can in the respective link guide 35,35 'depending on the desired Movement range arbitrarily arranged and with not shown means are attached. With the mentioned Pivoting movement of the backrest support 75 becomes the slider 85,85 'starting from the basic position according to FIG in the order of magnitude between 20 mm to 50 mm in the link guide 35,35 'moves. The one shown in Fig.2 Pivotal movement of the backrest 90 at an angle α of 24 °, the slider 85.85 'starting from the basic position advantageously only with a relatively small amount Sliding path in the order of magnitude between 20 mm to Swiveled 30 mm.

The actuating mechanism 60 partially shown in FIG. 4 has a release lever provided with a pressure piece 63 ' 63, which by means of two spaced tabs 62 and 64 and an axle pin 61 is mounted on the support body 20. The Tab 64 is shown schematically in FIG second tension and push member 6 operatively connected such that at a pulling movement according to arrow direction 8 '(Fig. 5) of the release lever 63 pivoted from the position shown and that Thrust piece 63 'with the plunger 16' of the gas pressure spring 16 in Intervention and with a pushing movement according to arrow direction 8 disengaged.

5 is on a larger scale that on one side wall 21 'of the support body 20 arranged and not shown Middle attached grid mechanism 65 in a sectional view shown. Furthermore, you can see a section of the Support body 20 arranged and with the partially shown second pull and push member 6 operatively connected actuating mechanism 60 for the arranged in the pedestal 15 (Fig.1) Gas spring 16 and a portion of the backrest support 75 with the second designed as a locking element Intermediate piece 80. The second intermediate piece 80 is not in detailed manner between the two in parallel Support arms 77 and 77 'arranged at a distance from one another (FIG. 3) of the backrest support 75 and arranged with not shown Means attached.

That shown in Figures 5 to 7 in profile cross section Intermediate piece 80 is spaced on both in the pivoting direction of the backrest support 75 ends arranged with respect to one another are provided with a web 81 and 81 '. Between the two webs 81 and 81 'are in the floor 80 'several, in the pivoting direction of the backrest support 75 spaced-apart recesses 82, 82 ' and 83.83 '. Between the preferably conical are tapered recesses 82,82 'and 83,83' corresponding webs 84, 84 'and 84 "are arranged.

5 with the intermediate piece 80 of the backrest support 75 engaged and in total with 65 designated grid mechanism essentially comprises a a lateral recess 66 "provided housing 70, a arranged thereon and fastened by means not shown Cover 66, a grid tab mounted in the housing 70 67, an associated pressure piece 74 and a raster head 71. The individual functional elements of the raster mechanism 65 are described below.

The housing 70 has a first recess 70 'and one connected second recess 70 ". In the first Recess 70 'is the grid tab 67 and the pressure piece 74 arranged, wherein in the second recess 70 " arranged with the pressure piece 74 operatively connected raster head 71 is. The in the housing 70 on a bolt 67 'in no closer illustrated way, grid tab 67 has a a first tab part 68 provided with a cam 68 'and a second tab part 69 provided with a cam 69 ' with an approximately circular arc-shaped end edge 68 " first tab part 68 is in one on the inside of the cover 66 provided recess 66 'arranged. The recess 66 'has a front edge 68 "correspondingly formed Plant as well as two conically widening, not designated Side faces. That also with an arc Front edge 69 "provided second tab part 69 is in one Recess 74 "of the pressure piece 74 arranged, the recess 74 "roughly analogous to the recess arranged in the cover 66 66 'is formed. The pressure piece 74 is molded on Guide part 74 'coaxially in a blind hole 72 of the raster head 71 arranged and with one in the recess 72 arranged first compression spring 73 operatively connected.

The raster head 71 is with a stepped guide part 71 ' guided in a recess of the housing 70, not designated as well as with a molded and tapered trained grid pin 71 ". The grid head 71 is against depending on the actuated grid tab 67 the restoring force of the arranged in the blind hole 72 first compression spring 73 and one against the restoring force the guide part 71 'and in the second recess 70 "of the housing 70 supported second compression spring 73 'shifted in the axial direction such that the grid pin 71 "in one of the spaced apart on the intermediate piece 80 provided recesses 82.82 'or 83.83' locks.

5 is the grid tab 67 of the above in detail described grid mechanism 65 by means of a grid tab 67 operatively connected and shown schematically through the recess 66 "first pull and Push member 5 by an oriented in the direction of arrow 7 Thrust movement pivoted about the pin 67 'such that the Raster head 71 against the restoring force of the two compression springs 73,73 'shifted in the axial direction and with the molded Raster pin 71 "for example in the recess 82 of the intermediate piece 80 snaps into place. The relative movement is in this position of the backrest support 75 with respect to the support body 20 blocked.

In Figure 6, the grid tab 67 is by means of the tension and push member 5 by a pulling movement oriented in the direction of arrow 7 ' pivoted about the pin 67 'so that the raster head 71 by the restoring force of the two compression springs 73, 73 ' that the grid pin is moved in the axial direction 71 "comes out of engagement of the intermediate piece 80. In this Position can the backrest support 75 relative to the support body 20 are freely pivoted.

In Figure 7, the grid tab 67 is by means of the tension and push member 5 by the thrust movement oriented in the direction of arrow 7 pivoted about the pin 67 'so that the grid pin Snap 71 "into one of the recesses 82,82 'or 83,83' can, or as shown in Fig.7, on one of the between webs 84.84 'provided in the recesses 82.82' or 83.83 ' or 84 "in a so-called preset position as long as spring-loaded rests until the grid pin 71 "during a swivel movement of the backrest support 75 by the restoring force of the compression springs 73, 73 'and depending on the position in one of the recesses 82.82 'or 83.83' engages.

At this point it should be noted that another Not shown embodiment variant on the unspecified inside of between the two arms 77 and 77 'of the backrest support 75 arranged intermediate piece 80 arranged a toothing, not shown and the grid pin 71 "on the facing end face analog can be provided with a toothing. This will in essentially achieved that the backrest support 75 at Swivel movement with several, rastered positions relative is adjustable to the support body 20.

Fig. 8 shows on a larger scale and in sectional view front joint 1 (Fig. 1,2) and you can see the knee side arranged and mounted on the support body 20 pivot body 40 with the deformed tube part 41 'and the one arranged therein Torsion element 46, which the receiving tube 41 in penetrates in the axial direction. In the illustrated embodiment the torsion element 46 has two superimposed arranged and rectangular in profile cross section Torsion bars 46 ', 46 ". The two torsion bars 46', 46" are in the illustrated embodiment. preferably with the adjacent Long sides approximately horizontally in the swivel body 40 arranged. On the receiving tube 41 of the swivel body 40 is a clamping lever 50 which is attached to the the support bearing 30 of the support body 20 arranged clamping mechanism 55 is in operative connection. The on the receiving tube 41 of the Swing body 40 arranged and fastened clamping lever 50 will be described later in connection with Fig.9.

In Figure 8 is that shown in profile cross-section and trained for receiving and storing the clamping mechanism 55 Support bearing 30 shown. The support bearing 30 has one an end wall 26 integrally formed abutment wall 31 and one formed on the bottom 24 of the support body 20 bottom part 32nd and an intermediate piece arranged parallel to it 32 '. On the bottom part 32 is one with a recess 33 'provided web 33 formed.

The arranged in the approximately housing-shaped support bearing 30 Clamping mechanism 55 has a not shown Hub piece 56 with laterally mounted rollers 57 and 57 '. The hub piece 57 is provided with a bearing part 29 on the inside 31 'of the contact wall 31 supported adjusting screw 59 permeated, which with the other not closer designated end stored in the recess 33 'of the web 33 is. The adjusting screw 59 is with the adjusting wheel 58 operatively connected that by a around the axis 59 'in the direction of the arrow Y 'oriented rotation of the hub 56 with the two laterally mounted rollers 57, 57 'either in Arrow direction Z 'or Z "is shifted by the arrow direction The two rollers 57 become Z 'oriented and 57 'against one provided with an elongated recess 51' Plate 51 of the clamping lever 50 pressed and thereby the resilient restoring force of the in the swivel body 40 arranged torsion element 46 biased. At the in Direction of arrow Z "oriented movement can be the elastic Restoring force of the torsion element 46 is reduced again or be relaxed.

Fig. 9 shows a part of the plan view and in larger Scale shown swivel body 40, which is essentially forms the front pivot axis X-X. The swivel body 40 includes the receiving tube 41, which in the area of the partially shown axis of symmetry S-S of the chair 100 (Fig. 3) to the outer contour of the two torsion bars 46 ' and 46 "is provided with the form-fitting tube part 41 ' (Fig.8).

There is a web 52 on both sides of the deformed tube part 41 ′ and 53 of the clamping lever 50. The two bridges 52,53 each engage with the outside diameter of the Receiving tube 41 adapted, approximately semicircular section 52 'and 53' over the receiving tube 41 and are not in shown attached to it. Between the two bridges 52 and 53 is the one with the elongated recess 51 'for the set screw 59 provided plate 51 which attached to the webs 52, 53 and to the receiving tube 41 is. Furthermore, one can be seen in FIG. 9 at one end of the receiving tube 41 arranged clamping sleeve 42 with the arranged and fastened section 49 of the seat support 45 (Fig.3). The clamping sleeve 42 is at the outer end with one the outer contour of the two torsion bars 46 'and 46 "conformed to the shape Section 42 'provided. The other, opposite End of the receiving tube 41 is formed analogously and provided with an adapter sleeve 43, which at the outer end has a form-fitting section 43 '(FIG. 3).

In Figure 10, the swivel body 40 along the line A-A in Fig. 9 shown in section and you can recognize that by the two Torsion bars 46 'and 46 "form-fitting pipe part 41' and the receiving tube arranged in the one clamping sleeve 42 41. At the two ends of the receiving tube 41 is preferred a sliding bush 44 and 44 'arranged on which the clamping sleeves 42 and 43 operatively connected to the seat support 45 are stored.

The one attached to the two clamping sleeves 42, 43 of the swivel body 40 Seat support 45 and the second articulation point 2 on the seat support 45 and the third articulation point 3 on the arm-shaped support arm 20 articulated backrest support 75 can counter the adjustable, spring-elastic Restoring force of the arranged in the swivel body 40 and form-fitting with the receiving tube 41 and with the two Adapter sleeves 42, 43 operatively connected torsion element 46 around the horizontal pivot axis X-X of the first articulation point 1 is pivoted become.

11 shows as a second embodiment a schematic Side view of a section of an office chair 200 and you can see a partially shown pedestal 115, one attached to it and in the knee area a first joint point 1 'provided support body 120, a mounted thereon and designed to receive a seat body 110 Seat support 145 and a backrest support 175. The seat bracket 145 has two at a parallel distance from one another arranged boom 146 and 148, which at the knee end each with a sleeve body 147 and 149 attached to it are provided. Between the two sleeve bodies 147 and 149 is the one with a hollow cylindrical bearing part 126 (Fig. 12) provided support body 120 arranged. Partially in Fig. 11 Stand column 115 shown comprises a standpipe 117 and a gas pressure spring 116 arranged therein, which with a Actuation mechanism 130 is operatively connected. The one on the pillar 115 stored elements of the office chair 200 can, such as above in connection with the office chair 100 according to FIG. 1 described, on the one hand height-adjusted in the double arrow direction Z. and on the other hand in the double arrow direction Y around the vertical Axis 115 'of the column 115 in the horizontal plane be rotated. The one with the plunger 116 'of the gas pressure spring 116 engaging actuation mechanism 130 is preferred analogous to that described in connection with Fig.4 and Fig.5 Actuating mechanism 60 formed.

The backrest support 175 includes the two in the direction of the support arms 177 and 178, which has a second joint 2 'with the two Booms 146 and 148 of the seat support 145 are operatively connected as well mounted on the support body 120 via a third joint 3 ' are. On the support body 120 is in the knee area a substantially the horizontal pivot axis X'-X ' Swivel device 140 and a schematically shown Support bearing 123 arranged, which for receiving a clamping mechanism 153, not shown is. The tensioning mechanism 153 for adjusting the resilient Restoring force of the arranged in the swivel device 140 Spring elements 141, 141 '(FIG. 12) comprise one by one Axis 152 ', adjusting wheel 152 rotatable in the double arrow direction Y' and an adjusting screw 151. The adjusting screw 151 is with a clamping element 150 of the swivel device 140 is operatively connected.

The office chair 200 is shown in a top view in FIG one recognizes the and arranged on the axis of symmetry S'-S ' with the head piece 125 on the column 115 (Fig.11) Support body 120. The support body 120 has two by one Bottom 124 interconnected and spaced apart arranged side walls 121 and 121 '. On the two side walls A bearing pin 122 and 122 'is arranged in each case 121, 121' and attached in a manner not shown. To the each bearing pin 122 and 122 'is a sliding block 136,136 'stored and secured by means not shown. The supporting body is in the front, knee-side area 120 with the bearing part oriented transversely to the axis of symmetry S'-S ' 126 provided.

The bearing part 126 has a recess 126 'in which the Clamp 150 arranged and in a manner not shown is stored. On both sides of the axis of symmetry are S'-S ' the arms 146 and 148 of the seat support 145 are arranged, which in the knee area with the attached one Sleeve body 147 and 149 are provided. The sleeve body 147 and 149 are shown schematically for inclusion in FIG Torsion bars 141 and 141 'are formed. The torsion bars 141 and 141 'are at one end to the clamp 150 connected and with the other end in one Clamping bushing 142 and 142 'arranged and against rotation secured. The clamping bushes 142 and 142 'are not closer in FIG as shown in the two on the arms 146 and 148 the seat support 145 attached sleeve bodies 147 and 149 arranged (Fig.12). They are at the front, knee end two arms 146 and 148 each on the arranged thereon and attached sleeve body 147 and 149 to the pivot axis X'-X 'of the swivel device 140 is mounted. On the opposite, other end is on the two arms 146 and 148 each have a bearing pin 144 and 144 '. The bearing bolts 144, 144 'are each with a bearing 174 and 174 'provided support arms 177 and 178 of the backrest support 175 hinged.

Deviating from the first exemplary embodiment according to FIG. 1 to 4 is in the second embodiment according to Fig.11 and Fig.12 which are parallel to the axis of symmetry S'-S 'oriented guide 135 and 135' to the two support arms 177 and 178 of the backrest support 175 arranged. In the link guide 135 and provided with an arcuate curved path 172 and 173 135 'is that on the support body by means of the hinge pin 122, 122' 120 mounted sliding block 136 and 136 'arranged. at this variant, the link guide 135 and 135 'in the pivoting movement of the backrest support oriented in the seat direction 175 relative to the two on the fixed Carrier body 120 mounted sliding blocks 136,136 'moves.

As shown schematically in Figure 11, is the imaginary center D 'for the arcuate curved path of the link guide 135 and 135 'above the top edge 177' and 178 ' the two starting from the second joint 2 'in the direction the third joint 3 'inclined support arms 177 and 178 of the backrest support 175 arranged. Preferably the imaginary center D 'is arranged in such a way that this is in the working position of the chair 200 (Fig. 11) between the essentially horizontally oriented surface 146 'and 148' of the two arms 146 and 148 of the Seat support 145 and the upper edge 177 'and 178' of the inclined Support arms 177 and 178 of the backrest support 175 are arranged is. The two support arms are in the backrest area 177 and 178 by a backrest part 176 and by one bottom 176 '(FIG. 12) formed thereon.

Fig. 13 shows one shown on a larger scale Section along the line B-B in Fig.11 and you can see the between the two arms 146 and 148 of the seat support 145 arranged backrest support 175, which with the two Support arms 177 and 178 on the bearing bolts 144 and 144 'of two arms 146,148 is mounted. In the lower part of the both support arms connected by a base part 179 177,178 is on the inside 177 "of the support arm 177 Paragraph 179 'provided in which the circular arc Curve 172 formed recess for the backdrop guide 135 is arranged. On the opposite inside 178 "of the other support arm 178, a shoulder 179" is provided, in which the curved path 173 trained recess for the slide guide 135 ' is arranged. You can also see the in the Recesses of the two cam tracks 172 and 173 arranged and on the bearing pin 122 and 122 'mounted sliding blocks 136 and 136'. The sliding blocks 136 and 136 'are each by one at the paragraphs 179 'and 179 "slide plate secured by screws 138, 138' 137 and 137 'in the cam track of the link guide 135 and 135 'held. The two sliding plates 137, 137 'are preferably as shown in Fig. 14 and Fig. 15, analogous to circular curve 172, 173 concave.

Furthermore, one can see in Fig. 13 between the two side walls 121, 121 'of the supporting body 120 arranged raster mechanism 155, which has a grid head connected to it 170 with one on the bottom part 179 of the backrest support 175 arranged grid segment 181 can be brought into engagement. The grid segment provided with a toothing (Fig. 16a to 16b) 181 is in one on the bottom part 179 of the backrest support 175 provided recess 180 arranged and through lateral webs 180 'and 180 "fixed to the bottom part 179 Function and details of the grid mechanism 155 is in Connection described with Figures 16a to 16c.

14 shows a section along the line C-C in FIG. 13 and you can see a section of the one shown in the working position Office chair 200 according to FIG. 11 with that on the bearing 174 'of the support arm 178 articulated arm 148 of the seat support 145 and the one arm 178 of the backrest support 175 arranged slide guide 135 '. The circular arc Curve path 173 for the link guide 135 'is through the two opposite side walls 173 'and 173 "limited. In the cam track 173 is on the one bearing pin 122 'arranged sliding block 136', which by the concave slide plate 137 'and screws 138' is secured. In the working position shown in Fig. 14 is the pivoting movement of the support arm 178 through one Side wall 173 "of the curved path 173 limited. Also recognizes one above the upper edge 178 'of the support arm 178 arranged theoretical center D 'for the circular arc Curve path 173 of the link guide 135 '. Below the link guide 135 'is the bottom part 179 of the backrest support 175 arranged.

15, the section of the office chair 200 is in the back shown inclined position and one recognizes the inclined Boom 148 and the relative to the fixed Support arm 178 pivoted around the bearing 174 ' of the backrest support 175. In the shown in Fig.15 Tilt position (relax position) is the swiveling movement of the Support arm 178 through the other side wall 173 'of the cam track 173 limited.

At this point it should be noted that the one on the opposite Support arm 177 of the backrest support 175 arranged Link guide 135 analogous to that in connection above with the scenery guide described in Figures 14 and 15 135 'is formed. The relative to that at the fixed Stand column 115 arranged support body 120 oriented Sequence of movements of the backrest support 175 with the articulated thereon Booms 146 and 148 of the seat support 145 are carried out absolutely in sync. Furthermore, one can see in FIGS. 14 and 15 those arranged above the upper edge 178 'of the support arm 178, imaginary center D 'for the theoretical center line R "of the cam track.

16a to 16c is dependent on the desired Position of the backrest support 175 which is engaged bringable and arranged on the fixed support body 120 Raster mechanics 155 shown in different positions. In Figure 16a the backrest support 175 is in relation blocked on the support body 120 in the sitting and working position and in Fig. 16b in a so-called freewheeling position and in Fig. 16c in a backward inclined and blocked position (Relax position) shown.

That on the front bottom part 179 of the backrest support 175 arranged grid segment 181 is with one between two End pieces 182 and 182 'arranged toothing 183, which starting from the blocked position according to Fig. 16a in the direction of the arrow P 'according to FIG. 16b Swiveling movement of the backrest support 175 up to the blocked one Position according to Fig. 16c in additional intermediate positions can be blocked. In the illustrated embodiment of the raster segment 181 can be relative to the support body 120 pivotable backrest support 175 in total be blocked in six positions. The grid segment 181 can, however, also be used with a larger or smaller number of teeth of the toothing 183 be trained.

The one in Fig.16a to Fig.16c in view and partially Raster mechanism 155 shown in section comprises a bearing plate 156, a first ratchet lever pivotally mounted thereon 160, a second ratchet lever articulated to it 165 and one arranged in a guide bushing 171 Raster head 170. The one provided with a flange 171 ' Guide bushing 171 is in a at the bottom 124 of the support body 120 provided, for example molded nozzle 128 arranged. The two locking levers 160 and 165 are over one Tension and push member 5 'operatively connected. On the bearing plate 156 are two spaced apart Cam 156 'and 156 "and two spaced apart Flanges 157 and 157 ', each with a recess 157 "are provided.

There is a concave between the two flanges 157 and 157 ' trained leaf spring 154 arranged, which with the two Ends at the cams 156 'and 156 "of the bearing plate 156 and with the undesignated underside on two between the Flanges 157,157 'arranged and provided as a counter bearing Bars 158 and 158 'is supported. The first grid lever 160 has a cylindrical axle body 162, which on the both ends with a washer 162 'and 162 " is (Fig. 13). The first locking lever 160 is with the axle body 162 in the recess 157 "of the two flanges 157, 157 '. On the axle body 162 are two spaced apart first tabs 161,161 'arranged, which with in between arranged second tabs 164,164 'of the second raster lever 165 are operatively connected via a journal 163.

The second locking lever 165 is arranged on it cylindrical axle body 166 in a bearing plate 167 of the grid head 170 stored. On which the two locking levers 160 and 165 connecting journal 163 is a pull and Thrust member 5 'arranged, by means of which the two raster levers 160 and 165 depending on the direction of movement of the Tension and push member 5 'are pivotable.

The grid head 170 is on the second grid lever 165 facing side with the bearing plate 167, which with a stop 167 'and with one for mounting the cylindrical Axle body 166 correspondingly formed recess (not designated) is provided. At the other end of the raster head 170 are, for example, two at a distance from one another arranged grid pin 168 arranged with the teeth 183 of the raster segment 181 engaged or disengaged are feasible. The one arranged in the guide bushing 171 Raster head 170 is by means of one end the bearing plate 167 of the grid head 170 and with the other End supported on the bottom 124 of the support body 120 compression spring 169 pressed against the second raster lever 165.

Starting from the blocked seat shown in Fig. 16a The two can work position by one on the train and Thrust member 5 'acting tensile force around the journal 163 in the so-called freewheel position (Fig. 16b) can be swiveled, in which the raster head 170 by the action of the compression spring 169 with the grid pins 168 arranged thereon except Engagement of the teeth 183 of the grid element 181 (Fig.16b). Then the two raster levers 160 and 165 by the pulling and pushing member 5 'in a not closer Preselection position shown pivoted, in which the grid pin 168 are arranged above the toothing 183. In the desired intermediate position or completely backwards inclined position (relax position) are the grid pins 168 again by the restoring force of the leaf spring 154 brought into engagement with the teeth 183 of the grid element 181 (Fig.16c).

Claims (16)

1. A chair, in particular an office chair which is adjustable in the height and inclination, consisting of a carrier body (20;120) held on an upright standard (15;115) and provided with at least one arc-shaped curve path (38,38';172,173) oriented in the swivelling direction, a swivel axis which is disposed thereon on the knee side and transversally to the sitting direction and is arranged in the form of a first joint position (1;1') with at least one associated spring element, a seat carrier (45;145) which is swivellable about the first joint position against the restoring force of said spring element and a backrest carrier (75;175) operatively connected with the same by way of a second joint position (2;2'), which backrest carrier is coupled thereto by way of a third joint position (3,3') for the swivelling movement which is oriented relative to the carrier body (20;120) in the sitting direction, characterized in that the swivelling movement which is oriented backwards in the sitting direction and then forwards again depending on the arc-shaped curve path (38,38';172,173) can be fixed by a snap-in locking mechanism (65;155) in several randomly selectable positions and can be released therefrom again, which mechanism is arranged on the carrier body (20;120) and can be brought into engagement with the backrest carrier (65;155).
2. A chair as claimed in claim 1, characterized by link guide means (35,35') which are disposed on either side on the carrier body (20) and are provided with the curve path (38,38') and in which sliding blocks (85,85') are disposed which are each held on a carrier arm (77,77') of the backrest carrier (75) and are guided during the swivelling movement of the backrest carrier (75) along the curve path (38,38'), which swivelling movement is oriented relative to the carrier body (20).
3. A chair as claimed in claim 2, characterized in that the two sliding blocks (85,85') are each held on a hinge bolt (79,79') disposed on the carrier arm (77,77') of the backrest carrier (75).
4. A chair as claimed in claim 3, characterized in that the hinge bolt (79,79') which is disposed on the carrier arm (77,77') of the backrest carrier (75) is arranged in form of a sliding block which can be guided along the curve path (38,38').
5. A chair as claimed in claim 1, characterized by a link guide means (135;135') which is disposed on each carrier arm (177,178) of the backrest carrier (175) and is provided with the curve path (172,173) and in which sliding blocks (136;136') held on either side of the carrier body (120) are guided during the swivelling movement of the backrest carrier (175) along the curve path (172,173), which swivelling movement is oriented relative to the carrier body (120).
6. A chair as claimed in claim 5, characterized in that the two sliding blocks (136,136') disposed in the link guide means (135,135') are each held on a hinge bolt (122,122') disposed on the carrier body (120).
7. A chair as claimed in claim 6, characterized in that the hinge bolt (122,122') disposed on the carrier arm (177,178) of the backrest carrier (175) is arranged in form of a sliding block guided along the curve path (172,173).
8. A chair as claimed in one of the claims 1 to 7, characterized in that the individual curve path (38;38';172,173) of the link guide means (35,35';135,135') is provided with a theoretical circular-arc-shaped central axis (R';R") whose central point (D;D') is disposed in the idle position of the chair (100;200) between the mutually facing longitudinal walls of the carrier body (20;120) and the seat carrier (45;145).
9. A chair as claimed in claim 1, characterized by a swivel body (40;140) which forms the knee-sided horizontal swivel axis and is operatively connected with the carrier body (20;120), as well as by a tensioning mechanism (55;153) which co-operates with the same and by means of which the spring-elastic restoring force of the spring element disposed in the swivel body (40;140) is adjustable.
10. A chair as claimed in claim 9, characterized in that the spring element disposed in the swivel body (40;140) is arranged as a torsion spring (46;141) which comprises at least two torsion bars (46',46";141',141") which are arranged rectangularly in the profile cross section and rest against one another with their face sides, and that the spring-elastic restoring force of the same is adjustable by means of the tensioning mechanism (55;153).
11. A chair as claimed in claims 9 and 10, characterized in that the tensioning mechanism (55;153) is provided with a set-screw (59;151) which is disposed in a supporting bearing (30;123) of the carrier body (20;120) and acts upon an associated tensioning lever (50) operatively connected with the torsion bars (46',46";141',141") and by means of which the spring-elastic restoring force is adjustable.
12. A chair as claimed in claim 1, characterized in that the backrest carrier (75) is provided in the zone of the carrier body (20,120) comprising a floor (24;124) with a transition element (80;179) which mutually connects the two carrier arms (77',77';177,178) and on which the snap-in locking mechanism (65;155) is disposed which is arranged to block the swivelling movement of the backrest carrier (75;175) which is oriented relative to the carrier body (20;120).
13. A chair as claimed in claims 1 and 12, characterized in that the snap-in locking mechanism (65) comprises a springloaded snap-in head (71) with attached snap-in pins (71") which depending on the swivelling movement of the backrest carrier (75) can be brought into a positive-locking engagement with at least one recess (82,82';83,83') disposed in the transition element (80) of the carrier body (20).
14. A chair as claimed in claims 1 and 12, characterized in that the snap-in locking mechanism (165) is provided on the inner side of the transition element (179) with a snap-in segment (181) which comprises a toothed wheel work (183) disposed transversally to the swivelling direction, which snap-in segment can be brought into positive-locking engagement with a snap-in head (170) disposed on the carrier body (120) depending on the swivelling movement of the backrest carrier (175).
15. A chair as claimed in claim 14, characterized in that the snap-in head (170) is provided with at least one snap-in pin (168) which is arranged analogously to the toothed wheel work (183) and can thus be brought into a positive-locking engagement.
16. A chair as claimed in one of the claims 13 to 15, characterized in that the snap-in locking mechanism (65;165) disposed in the carrier body (20;120) is provided with a snap-in bracket (67;160,165) which is swivellable about an axis, is operatively connected with a pulling and thrust member (5;5') and, depending on the direction of movement, by means of which the thus operatively connected snap-in head (71;170) can be brought into positive-locking engagement or out of engagement with the recesses or with the toothed wheel work of the transition element (80,179).

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