DE8802405U1 - Arrangement for synchronous adjustment of the inclination of the seat and backrest of a swivel chair or armchair - Google Patents

Description

Kohl GmbH

Paul-Ehrlich-Strasse 4 6074 Bödermark/Ober-Roden

Arrangement for synchronous adjustment of the inclination of the seat and backrest of a swivel chair or armchair

The invention relates to an arrangement for synchronously adjusting the inclinations of the seat and the backrest of a swivel chair or armchair, consisting of a seat support rigidly attached to the standpipe of the swivel chair or armchair, to which

front area of the seat of the swivel chair or armchair is pivotably attached about at least one horizontal axis, a backrest and seat inclination distribution device, to which on the one hand the backrest support of the swivel chair or armchair is attached and which on the other hand is pivotably mounted about a horizontal axis on the seat support, and a locking device for locking the backrest and seat inclination adjustment device from its pivoting movement, wherein the locking device is on the one hand attached to the backrest

and seat inclination adjustment device and on the other hand, viewed from the backrest, is hinged to the seat support in front of the central longitudinal axis of the stand tube of the swivel chair or armchair.

Swivel chairs and swivel armchairs ¹ « are known, consisting of a standpipe (possibly with height adjustment for the seat), base, seat support and seat as well as a (possibly height-adjustable) backrest support, whereby the seat is arranged on the seat support so as to be pivotable about a horizontal axis running transversely to the central longitudinal axis of the backrest support or standpipe below the front area of the seat. When pivoting the

O seat around the axis after actuation of a release

lever β, the seat is adjustable in such a way that it is lowered in the front area and raised in the rear area or vice versa, so that the user of the swivel chair or armchair can select the desired inclination or slant of the seat above the seat support and can then lock it using the release lever. It is also known to attach the backrest support to the seat support using a swivel joint in such a way that the inclination of the

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- 10 -

Backrest can be adjusted by swiveling the backrest around this pivot point. If the inclination of the seat is now divided as indicated, while the position or inclination of the backrest remains unchanged, and the user remains leaning against the backrest, the backrest exerts pulling or twisting forces on the user's clothing, particularly in the back area - "shirt-pulling effect" - which is perceived as unpleasant and can lead to impairments or even damage to the clothing. To counteract this and ensure that the backrest changes its inclination as synchronously as possible with the adjustment of the inclination of the seat,

a known swivel chair or armchair, the backrest support is hinged to the seat support by means of a backrest and seat inclination adjustment device. The hinge point of this adjustment device on the seat support is located in front of the central longitudinal axis of the base of the swivel chair in the upper area of the seat support near its upper edge, as seen from the backrest. The desired change in the inclination of the

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Backrest synchronously with, i.e. simultaneously with, the TJT 4t.«**· 4a1 1 ttMM Jam II j» 4 «mt vt*« Jam C4 Imam «nil &Agr;&Mgr;&bgr;4&agr;&Iacgr; 4

tux &sgr; vviiuug UVi nvjiguiig vivo wx &ngr;&bgr;&ngr;&sgr;&sgr;&khgr;&khgr; vx uavx w are adjusted by means of a gas spring, which is hinged on the one hand in the area where the adjustment device is attached to the backrest support and on the other hand below the articulation point of the adjustment device on the seat support in the area in front of the central longitudinal axis of the swivel chair's standpipe. The adjustment of the inclination of the seat is carried out by actuating a release lever, via which the valve of the gas spring is actuated, whereupon, when the inclination of the swivel chair's seat is to be adjusted forwards, the gas spring, using the pressure exerted by it, pivots the adjustment device and the backrest support around the articulation point of the adjustment device on the seat support and thus simultaneously pivots the seat around its axis on the seat support. If the inclination of the seat is to be restored from a position reached by this, the valve of the gas spring is also operated via the release lever, and the user simply applies body pressure against the backrest and, if necessary, the rear area of the swivel chair seat, the gas spring is now compressed, whereby the adjustment device and backrest support are pressed against the pivot point of the

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12 -

The gas spring on the seat support is pulled and can thus be swiveled back around the anchor point of the adjustment device on the seat support, and the seat can also be swiveled back around its axis on the seat support in the direction of its lowest position in the rear area. With this design, the inclination of the seat and backrest can be continuously adjusted in the manner described.

However, it has been shown that this known arrangement for adjusting the inclination of the seat and backrest only reduces the "shirt-pulling effect" mentioned, but does not completely eliminate it or eliminates it to a negligible extent. If one measures the distance from a point in the middle of the seat to a point in the middle of the backrest of a swivel chair of the _type described, this distance increases from, for example, 28 cm to 32 cm when the inclinations of the backrest and seat are adjusted from the extreme front position to the extreme rear position, i.e. by a dimension in the order of centimeters, so that the "shirt-pulling effect" mentioned is still present to a considerable extent.

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The object of the invention is therefore to create an arrangement for the synchronous adjustment of the inclinations of the seat and backrest of a swivel chair or armchair of the type described above, with which

the tensile forces exerted by the backrest on the user's clothing when adjusting the inclination are completely eliminated or reduced to a negligible level. At the same time, a slimmer design of the adjustment device and the seat support is to be achieved.

According to the invention, this is achieved in that the backrest and seat inclination adjustment device seen from the backrest behind the central longitudinal axis of the standpipe of the swivel chair or

-chair is pivotally mounted on the seat support, that the seat of the swivel chair or armchair is articulated in the rear area of the legs to the backrest and seat tilt adjustment device and that at least one of the pivot points of the seat has radial play in relation to the pivot axis of the backrest and seat tilt adjustment device on the seat support.

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Advantageous further developments of the invention result from the subclaims»

In particular, the front pivot point of the seat on the seat support can have a radial play in relation to the pivot axis of the backrest and seat inclination adjustment device, i.e. can be displaced in relation to this.

However, the rear pivot point of the seat on the backrest and seat tilt adjustment device can also have radial play in relation to its pivot axis, i.e. be displaceable in relation to it.

Furthermore, both the front pivot point of the seat on the seat support and the rear pivot point of the seat on the backrest and seat inclination adjustment device can have radial play in relation to the pivot axis of the backrest and seat inclination adjustment device, i.e. can be displaceable in relation to it.

The arrangement according to the invention enables the synchronous adjustment of the inclinations of the backrest

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backrest and seat of the swivel chair, the aforementioned "shirt-pulling-out effect" ¹¹ is completely or at least almost completely avoided. If, in a swivel chair of the prior art, as stated at the beginning, the distance between a point in the middle area of the seat and a point in the middle area of the backrest increases by a dimension in the order of centimeters when the inclinations of the backrest and seat are adjusted from the extreme front to the extreme rear position, this distance is reduced to zero, or even below zero, by the arrangement according to the invention for the synchronous adjustment of the inclinations of the seat and the backrest and is at most in the order of millimeters, so that it can be neglected because a "shirt-pulling-out effect" no longer noticeably occurs.

The arrangement can also be designed in such a way that the seat of the swivel chair or armchair is preferably connected in its front area to the seat support via a joint arrangement. This ensures that the seat, when adjusting, performs a swivel movement around its linkage to the seat support at the same time as a sliding movement towards

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Backrest support can be moved towards and away from the backrest, by means of which a difference in distance between the backrest support and the seat is completely compensated and it is thus achieved that when the inclinations of the backrest support and the seat are adjusted, the distance between a point on the backrest support and a point on the seat is at least always constant or, as stated, is even reduced below hull.

The arrangement according to the invention is advantageously designed in such a way that when the inclinations of the backrest support and seat are adjusted, the seat can be pivoted about its articulation on the seat support by an angle of approximately 10°. The ratio of the adjustment of the inclination of the seat to the adjustment of the inclination of the backrest support is preferably 1 x 1.68.

By designing the arrangement according to the invention, the height of the backrest and seat inclination adjustment device as well as the seat support can be reduced considerably - from about 120 mm according to the state of the art to about 85 mm and even less - so that the

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The slimmer design is achieved.

Q Further details and advantages of the invention will be

described in more detail below using the embodiments shown in the attached drawing.

Show it

Fig. 1 shows a first embodiment of an arrangement according to the invention for synchronous adjustment of the inclinations of the seat and the backrest in a side view in section with the inclination adjustment in the outermost front position,

Fig. 2 the embodiment according to Fig. 1 with inclination adjustment in the extreme rear position,

Fig. 3 shows a further embodiment of an arrangement according to the invention for synchronous adjustment of the inclinations of the seat and the backrest in side view Io section with inclination adjustment in the extreme front position,

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- 18 .-

Fig. 4 the embodiment according to Fig. 3 with tilt

* adjustment in the extreme rear

&igr; Position and

Fig. 5 and 6 a third embodiment of a

inventive arrangement once in its

'■ extreme front position (Fig. 5) and so-

then in its extreme rear position

tion (Fig. 6).

In Fig. 1, the first embodiment of an arrangement according to the invention for synchronous adjustment of the inclinations of the seat and the backrest is shown schematically in a side view of the right side of a swivel ') Chair in section after adjusting the inclines

into the extreme front position (forwards/downwards), and in Fig. 2 this embodiment is also shown schematically in a side view of the right side of a swivel chair in section, but after adjusting the inclinations of the seat and backrest into the extreme rear position (backwards/downwards). In Fig. 1 and Fig. 2 the same reference symbols indicate the same parts, so that in the following Fig. 2 is only discussed insofar as it concerns the adjustment of the inclinations of the seat and backrest into the extreme rear position.

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In Fig. 1, 1 designates the upright of a swivel chair, which is seated with the receiving cone 2 at its upper end in the seat support body A, so that the latter is rigidly attached to it. As a seat support, the seat support body A is essentially a pentagon in side view, which predominantly follows the shape of a trapezoid, the upper side (base line) of which is longer than the lower side (base line) which is approximately parallel to it, and the left (leg) side of which, viewed from the backrest, is located in front of the central longitudinal axis of the upright 1, runs approximately at right angles to the upper and lower sides, while the right side of which, viewed from the backrest, is located behind the central longitudinal axis of the upright 1.

The seat 3, which consists of a seat shell with a seat cushion resting on it, is secured by means of the holes (eyes) 4" in a vertical extension 4* or several such extensions (one behind the other in the view according to the drawing) of a seat 3 mounted in the front area of the seat 3 on the underside of the seat shell, transverse to the central longitudinal axes of the standpipe 1 and the backrest 6.

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Flat iron 4 at the transverse to the central longitudinal axis of the

The seat support body A is articulated on a horizontal axis 5 arranged on the seat support body A, which runs close to the upper corner of the seat support body A, so that the seat 3 is pivotably mounted on the seat support body A around this axis 5 as a center of gravity in order to adjust its inclination.

The backrest support 6 runs at its lower end below the rear area of the seat 3 into the body of the backrest and seat inclination adjustment device B - hereinafter referred to as the adjustment element body B - which is rigidly connected here to the end of the backrest support 6. The adjustment element body B is also essentially a pentagon in side view, which predominantly follows the shape of a trapezoid, whereby in relation to the seat support body A its right (leg) side, which runs approximately at right angles to its upper and lower sides (base line), faces away from the backrest support 6 and towards the seat support body A and its other, left side is angled from the lower side, which is shorter than the upper side (base line), to the backrest support 6 and then to the upper side and is at right angles to this.

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consolidated.

- 21 -

meets. Here, the end of the backrest support 6 bent towards the standpipe 1 is rigidly connected to the end of the adjustment element body B facing it by welding and is thus pivotably mounted on it. On the other hand, the adjustment element body B is pivotally mounted on an axis 7 running parallel to the axis 5 at approximately the same distance from its top and bottom and, viewed from the backrest, behind the central longitudinal axis of the standpipe 1 near or in the middle area of the seat support body A, at or near the middle height of the same, so that the backrest support 6 with the adjustment element body B is pivotably mounted on the seat support body A around the axis as a pivot axis for adjusting the inclination of the backrest.

The locking device 8 for locking the adjustment element body B from its pivoting movement can be a mechanical or hydraulic locking device. In the embodiment of the

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Fig. 1 and 2 shown as a telescopic arrangement and with its one end piece 9 at a pivot point 10 located in front of the central longitudinal axis of the standpipe 1, seen from the backrest, in the area of the corner between the left and lower side of the seat support body A and on the other hand with its opposite end piece at a pivot point 12 on the adjustment element body B, whereby this pivot point 12 is located in the rear end area of the adjustment element body B indicated by the arrow 13, i.e. in or near the area of the connection between the adjustment element body B and the end of the backrest support 6. The pivot points 10 and 12 can be formed by axes that run parallel to the axes 5 and 7 in the seat support body A.

As can be seen from Fig. 1 and 2, in the area of the standpipe 1 - determined by the articulation points 10 and 7 - the lateral ends of the seat support body A and the adjustment element body B overlap. The axis 7 in the seat support body A lies near the upper end of the standpipe 1 in a plane above the plane in which the axis 7 " lies in the seat support body A, with the axis 10 also lying near the standpipe 1.

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There is no rigid connection between the adjustment element body B and the seat 3 of the swivel chair; Rather, this connection is made according to the invention in that in the rear area of the seat 3 on the underside of the seat shell, parallel to the flat iron 4, a flat iron 14 with one or more (in view according to the drawing lying one behind the other) vertical extensions 15 is attached with hole(s) (eyes) 16 for pivotal connection with a bolt or the like 17 projecting into these hole(s) (eyes) 16 and arranged at the upper end of one or more rod(s) or an arm(s) 18, and the rod(s) or arm(s) 18 is (are) pivotable about this at the opposite lower end on an axis 19 which runs parallel to the axes 5, 7 and 10 in the seat support body A and to the axis 12 in the adjustment element body B below the locking device 8 near the underside of the adjusting body B is arranged in it 1.

In the arrangement described above for synchronous adjustment of the inclination of the seat and backrest, the surfaces 4 are in or near the middle of the

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- 24 -

front half and the flat iron 14 in or near the middle of the rear half of the seat 3, each running parallel to the axes 5, 7, 10, 12 and 19 O, each rigidly attached to the underside of the

Seat 5 is attached.

The distance between the pivot points and 19 on the rod(s) Cn) or the arm(s) 18 on the adjustment element body B is, preferably at equal distances from the underside of the seat&bgr; 3 to the axis 5 and to the bolt 17 (the flat irons 4 and 14 with their extensions 4* and 15 can be of identical construction), selected in such a way that on the one hand, when the inclination of the backrest support 6 and seat 3 is adjusted to the extreme rear position (backwards/downwards), which is shown in Fig. 2, the seat 3, which is curved in the side view, with the seat recess in its middle area comes into or almost into contact with the upper side of the adjustment element body B in its front area above the standpipe 1 and that on the other hand, when the inclination of the backrest support 6 and seat 3 is adjusted to the extreme front position (forwards/

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- 25 -

below), which is shown in Fig. 1, the seat 3 in the articulation point on the axis 5 can pivot around this uej an angle of or approximately 10°

Q can be executed clockwise and with

its middle area lifts off from the adjustment element body B, but the adjustment element body B in its rear area with its upper side almost comes into contact with the underside of the rear area of the seat 3, whereby the distance between the adjustment element body B and the underside of the seat 3 is only determined by the bead of the flat iron 14. These movements are carried out by displacement when the locking device 8 is released, e.g. by pressing a button.

() the posture of the user of the Brehstuhl or

-seat base forwards or backwards, so that by means of the pressure exerted by the user, the adjustment element body B and the backrest support 6 are pivoted about the axis 7 on the seat support body A and thus at the same time the seat 3 is pivoted about its axis 3 on the seat support body A.

When the inclination of the backrest support 6 and seat 3 is returned from this position as shown in Fig. 1 to the extreme rear/downward position

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According to Fig. 2, the seat 3 is pivoted about the axis 5 by the angle of or approximately 10 in an anti-clockwise direction, and this movement is

O also causes the body pressure of the

user against the backrest and, if applicable, the rear area of the seat 3 of the swivel chair with the locking device 8 released.

It is understood that under body pressure against the backrest and possibly the rear area of the seat 3 with the locking device 8 released, the inclinations of the seat and the backrest can be adjusted continuously even in intermediate positions between the two outermost positions shown in Fig. v and Fig. 2

can be adjusted, whereby the adjustment element body B is locked in such an intermediate position by the locking device 8 when the button is released.

Because the seat 3 is not rigidly attached to the adjustment element body B in its rear area, the connection between the rear area of the seat 3 and the adjustment element body B is rather between the extension 15 on the flat iron 14 and the adjustment element-

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- 27 -

body B is made via the joint arrangement formed by extension 15, bolt 17, arm 16 and articulation point 19, the previously described angular movements of the seat 3 about the axis 5, but at the same time also a relative movement of the seat to the backrest support 6 and thus to the backrest, are made possible and brought about. The inclination of the seat 3 is not adjusted to the same extent as that of the backrest support 6; rather, the ratio of the adjustment of the inclination of the seat 3 to the adjustment of the inclination of the backrest 6 is approximately 1:1.7, preferably 1:1.68.

This means that the aforementioned "shirt-pulling-out effect" is completely or at least almost completely avoided when the inclinations of the backrest and seat of the swivel chair are adjusted synchronously, as the change in the distance between a point in the middle of the seat and a point in the middle of the backrest support when the inclinations of the backrest and seat are adjusted from the extreme front to the extreme rear position is reduced to almost Ifull and is at most in the order of millimeters, so that it can be neglected because the "shirt-pulling-out effect" is noticeably reduced.

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- 28 -

no longer occurs.

The arrangement according to the invention is characterized by the joint connections between the seat 3, the seat support body A and the adjustment element body B as well as by the arrangement of the articulation points. Compared to the swivel chair or armchair of the prior art described in the introduction to the description, in which the articulation point of the backrest and seat inclination adjustment element is located in front of the central longitudinal axis of the swivel chair's upright tube when viewed from the backrest, this articulation point 7 is, according to the invention, moved behind the central longitudinal axis of the upright tube 1 and lower on the seat support body A and on the adjustment element body B when viewed from the backrest, which prevents the backrest support 6 from sinking further backwards/downwards as necessary when the inclination of the seat and backrest is adjusted to the backward/downward position, i.e. the extent of this movement, which is a relative movement to the movement of the seat 5 during adjustment, is reduced. A joint triangle is formed between the articulation points 12, 7 and 10, which supports the backrest 6 in

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-29-

Their respective position is required and this function is fulfilled more effectively the deeper the articulation point 7 is placed, i.e. the more the legs O 12, 7 and 12, 10 as well as 10, 7 of this joint triangle

&bull;approach each other in the sense of an equiangular triangle.

The favorable relative movement of seat 3 and backrest support 6 to each other is, on the other hand, brought about by the coupling of the rear area of seat 3 to the adjustment element body B via the joint arrangement 15, 17, 18, 19 described above, whereby this fulfills its function better the deeper the articulation point of rod or arm 18 on the axis 19 in the adjustment element body B - with a corresponding length of rod or arm 18 - can be laid, which only depends on the dimensions, i.e. the height of the adjustment element body B in this area.

Due to its front linkage by means of flat iron 4 with extension 4' and its eye 4 ^lf on the axle 5, the seat 3 is, although rotatably, fixedly mounted on the seat support body A at the linkage point of the axle 5. The rear linkage of the seat 3 on the

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- 30 -

The element body B, on the other hand, is connected by means of a flat iron 14 with an extension 15 and its eye 1$ as well as a rod or arm 18 with a bolt 17 and a linkage to the axis 19 via the joint arrangement 15, 17, 18.

19 is rotatably articulated at the articulation point 17 and is displaceable and pivotable according to the movement of the adjustment element body B, so that when the seat 5 is pivoted about the axis 5 by an angle of approximately 10°, the desired relative movements of the seat 3 and the backrest support 6 to one another can be carried out. The connection between the seat 3 and the adjustment element body B, created by the joint arrangement 15, 17, 18, 19, is dimensioned such that it allows the seat 3 to be pivoted about its bearing point on the axis 5 on the seat support body A by an angle of approximately 10°.

The pivoting movement of the seat 3 about the axis 5 of the seat support body A from the extreme front position according to Fig. 1 to the extreme rear position, according to Fig. 2 by the angle of about 70° consists of a pivoting movement of about 7° from the extreme front position to the horizontal and a further pivoting movement of about 3° to

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- 31 -

into the rearmost position, and the reverse applies to the swivel movement of the seat 3 about the axis 5 from the position according to Fig. 2 to the position according to Fig. 1, i.e. the swivel movement is in an angular range between approximately -3° to approximately +7° in relation to the horizontal.

In Fig. 3 and Fig. 4, a further embodiment of an arrangement according to the invention for synchronously adjusting the inclinations of the seat and backrest is shown, whereby the representation in Fig. 3 corresponds to that in Fig. 1 and the representation in Fig. 4 corresponds to that in Fig. 2. In Fig. 3 and Fig. 1, the same reference numerals also designate the same parts as in Fig. 1 and Fig. 2, so that reference is made to the description of Fig. 1 and Fig. 2. In the following, Fig. 4 will only be discussed insofar as it concerns the adjustment of the inclinations of the seat and backrest to the extreme rearward position.

The example shown in Fig. 3 and Fig. 4 differs from the example shown in Fig. 2 in the way the

- 32 -

Seat 3 on the seat support body. According to Fig. 3, the seat 3 is connected to the seat support body A* in the area in or near the middle of its front center via a joint arrangement O. This joint arrangement is made as follows: In the front area of the seat 3, on the underside of the seat shell, parallel to the flat iron 14, the flat iron 4 is attached with one or more (in view according to the drawing, one behind the other) vertical extensions 4* with hole(s) (eyes) 4" for the pivot connection with a projecting into the hole(s) (eyes) 4" at the upper end of one or more rod(s) or an arm(s) 20 ₍ - respectively arranged bolts or the like 5 ¹ , and

^ the rod(s) or arm(s) 20 is/are on

opposite lower end pivotally connected to an axis 21 which runs parallel to the axes 7 and 10 in the seat support body A* and to the axes 12 and 19 in the adjustment element body B, near the underside of the seat support body A' and in the position of the device according to Fig. 3 is arranged vertically below the articulation point 4', 4" in the seat support body A ^1. The flat iron 4 with extension or extensions 4' and eye or eyes 4" is preferably identical in construction to the flat iron 4.

iron 14 and its extension or extensions 15 and eye or eyes 16, and it is the flat iron 4 in or near the center of the front half of the seat O 3, parallel to the axes 7, 10, 12, 19 and 21

rigidly attached to the underside of the seat 3.

The seat support body A' in this design is also essentially a pentagon in the side view, starting from the basic shape of a trapezoid, but with the difference to the seat support body A according to Fig. 1 and Fig. 2 that the right side is from the upper side (base line) in the

-. right angle downwards and then again a little

is angled towards the central longitudinal axis of the standpipe 1 and its height almost reaches the height of the left side of the seat support body A', so that its shape in side view according to Fig. 3 and 4 is already very close to a rectangle.

This embodiment of the joint arrangement 4", 5', 20, 21 described above also has the feature that its articulation point on the axis 21 on the seat support body ^A1 is positioned as low as its overall height allows.

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In this embodiment of the arrangement according to the invention, when the inclinations of the seat and backrest are adjusted from the extreme front position according to Fig. 3 to the extreme rear position according to Fig. 4, the seat 3 also pivots by about 10° (from +7° to -3° relative to the horizontal), namely around its articulation points 5 ¹ and 21, distributed over these, but predominantly around the axis 21, whereby the articulation arrangement 4", 5', 20, 21 simultaneously causes a sliding movement of the seat 3 against the backrest support 6. This sliding movement completely avoids the extension of the distance from a point on the seat 3 to a point on the backrest 6, which may still occur in an embodiment according to Fig. 1 and 2 when the inclinations of the seat 3 and backrest support 6 are adjusted from the extreme front position to the extreme rear position, and any distance difference that may still occur is compensated. In addition, however, in this Embodiment the distance between a point in the middle area of the seat 3 and a point in the middle area of the backrest support 6 when adjusting from the extreme front to the extreme rear position even

-35-

reduced to below zero, i.e. the upper part of the item of clothing or e.g. shirt, blouse, sweater or jacket is slightly pressed or moved towards the lower part of an item of clothing or e.g. trousers or skirt, so that not only does a "pulling out effect" no longer occur, but the user of the swivel chair or armchair also gains additional physical freedom of movement.

When the inclinations of the seat 3 and the backrest support 6 are reset from the extreme rear position according to Fig. 4 to the extreme front position according to Fig. 3, the seat 3 is pivoted back about the articulation points 5' and 21 by approximately 10° (from -3° to +7° relative to the horizontal).

In a practical embodiment, the distance between the central longitudinal axis of the bolt 17 and the underside of the seat 3 and between the central longitudinal axis of the bolt 5' and the underside of the seat 3 is 25 mm each (including 5 mm flat iron thickness), while the distance between the central longitudinal axis of the bolt 17 and the central longitudinal axis of the axle 19 is 50 mm and the distance between the central longitudinal axis of the bolt 5 ¹ and the

- 36 -

Central longitudinal axis of the axis 21 is 35 mm. The (constant in every position of the swivel movement) distance between the central longitudinal axes of the bolts

v. 17 and 5' of the joint arrangements 16, 17, 18, 19 and

4", 5\ 20, 21 is 200 mm, while the distance between the central longitudinal axes of the axes 19 and 21 of these joint arrangements is 190 mm in the position according to Fig. 4 and 175 mm in the position according to Fig. In such an embodiment, the seat 3 can be moved from the position according to Fig. 3 to the position according to Fig. 4 by 15 mm towards the backrest support 6 and from the position according to Fig. 4 to the position according to Fig. 3 back again by 15 mm.

/ In other words, the joint arrangements 16, 17, 18, 19 and

4", 5', 20, 21 are dimensioned so that any possible difference in distance between seat 3 and backrest support 6 is at least compensated.

It does not follow from this that in the case of the embodiment according to Fig. 1 and 2 there would always be a difference in distance between the seat 3 and the backrest support 6, which is assumed to be compensated for in the embodiment according to Fig. 3 and 4. Such a difference in distance, which is in any case slight, can be necessary in the embodiment according to Fig. 1 and 2.

become.

- 37 -

if this is also compensated for by additional measures, such as the curvature of a lumbar support in the lumbar area of the backrest support or the corresponding shaping of the backrest cushion

In Figs. 5 and 6 a third embodiment of an arrangement according to the invention for synchronously adjusting the inclination of the seat and backrest of a swivel chair or armchair is shown, whereby the representation in Fig. 5 corresponds to that in Fig. 3 and the representation in Fig. 6 corresponds to that in Fig. 4. In Figs. 5 and 6 the same symbols also designate the same parts as in Figs. 3 and 4 and, if applicable, 1 and 2, so that in this respect reference is made to the description of Figs. 1 to 4.

This third embodiment differs from the embodiment according to Fig. 3 and 4 by the articulation of the seat 3 on the adjustment element body B. According to Fig. 5, the seat 3 is attached in its rear area by means of the flat iron 14 on the adjustment element body B in such a way that the

- 38 -

Flat iron 14 is rigidly attached to the underside of the seat 3 on the one hand in or near the middle of the rear half of the seat 3, running parallel to the axes 5 ^' , 7, 10 and 12, and on the other hand is articulated on the adjusting element body B with its vertical extension 15 or extensions 15 with bore(s) (eyes) 16 for pivotal connection to a horizontal bolt or the like 17' projecting into these bore(s) (eyes) 16 and arranged in the adjusting element body B as an axis, which also lies parallel to the axes 5', 7, 10 and 12, so that the seat 3 is also pivotably mounted on the adjusting element body B about this bolt or axis 17' as a pivot point when its inclination is adjusted. The flat iron 14 with the extension or several extensions 15 arranged one behind the other as shown in the drawing can be identical in construction to the flat irons 4 and 14 (including their extensions 15 or 4' and eyes 16 or 5'*) according to Fig. 1 to 4. In this third embodiment of the invention, rod(s) or arm(s) 18 and an axis 19 as in the joint arrangement 17, 18, ¹⁹ rih αβη Fig. 1 to 4 are not present, so that the articulation point 17' of the seat 3 is on the adjustment element body B

- 39 -

near its top edge or side.

Otherwise, the construction of this embodiment of an arrangement for synchronously adjusting the inclinations of the seat and backrest of a swivel chair or armchair is the same as in the embodiment according to Figs. 2 and 4, so that reference can be made to the description there for further details.

It should be emphasized, however, that in a practical embodiment of the embodiment according to Figs. 5 and 6 (corresponding to the embodiment according to Figs. 3 and 4), the distance between the central longitudinal axis of the bolt 17* and the underside of the seat 3 and between the central longitudinal axis of the bolt ⁵¹ and the underside of the seat 3 is also 25 mm (including 5 mm of flat iron thickness) and the distance between the central longitudinal axis of the bolt 3* and the central longitudinal axis of the axis 21 is again 35 mm. The distance (constant in every position of the swivel movement) between the central longitudinal axes of the bolts 17* and ⁵¹ (of the oil steering arrangement 5\ 20,

··■> 11 ·&diams;

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21) 200 mm.

From the position shown in Fig. 5 to that shown in Fig. 6

~ the seat 3 in this embodiment can be

if by 15 mm, but here by at least 15 mm to about 23 mm, advantageously also by 1? mm towards the backrest support 6 and from the position according to Fig. 5 back again by 15 mm. The joint arrangements 17* and 5* _f 20, 21 are thus again dimensioned so that any possible difference in distance between the seat 3 and the backrest support 6 is at least compensated.

Furthermore, in this third embodiment (_ the seat 3 when adjusting the inclination of the seat

and the backrest from the extreme front position according to Fig. 5 to the extreme rear position according to Fig. 6 and when returning from this to the extreme front position according to Fig. 5 also by about 10° (from +7° to -3° or from -3° to +7°, respectively, in relation to the horizontal) around the articulation points 5' and 21, distributed over these, but predominantly around the axis 21. The ratio of the adjustment of the inclination of the seat 3 to the adjustment

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The inclination of the backrest 6 is also approximately 1:1.7 _f, preferably 1:1.68.

&bull; However, the following difference is evident

5 and 6 to that of Fig. 3 and 4. While in the embodiment of Fig. 3 and 4, as already indicated above, in the position of the swivel chair or armchair according to Fig. 3 the side edges (left and right in the view according to the drawing) of the extension or extensions 4' and the rod(s) 20 are aligned with one another, in the position according to Fig. 4 the extension or extensions 4 ⁽ in relation to the rod(s) 20 but are flat towards the backrest and slightly (barely noticeable) angled towards the rod(s) 20, in the embodiment of Fig. 3 and 6 this angled or bent occurs in the position according to Fig. 5, while in the position according to Fig. 6 the side edges of the extension or extensions 4* and the rod(s) 20 are aligned with one another.

It should also be emphasized that in the practical implementation of the embodiment according to Fig. 5 and 6, the distance between a point in the

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middle area of the seat 3 to a point in the
middle area of the backrest when adjusting
the inclination of the backrest and seat From the

middle area of the backrest when adjusting

, outermost front in .the outermost rear

&igr;« _ Position also reduced to below zero.

Compared to the prior art, in the embodiments according to Fig. 1 to Fig. 6, the heights of the adjustment element body B and the seat support body A or A* can be reduced considerably from around 120 mm according to the prior art to around 83 or possibly even less mm between their upper and lower edges in the area of their greatest height. This results in a slim shape of the adjustment element body B and the seat support body A or A'.

! .<"), so that they are neither optically nor physically

appear disturbing and material is also saved. In the practical embodiment of an embodiment according to Fig. 5 and 4, the distance between the central longitudinal axis of the axis 19 of the joint arrangement 16, 17, 18, 19 and the lower edge of the adjustment element body B is approximately 10 mm, while the distance between the central longitudinal axis of the axis 21 of the joint arrangement 4", 5', 20, 21 and the lower edge of the seat support body A*

··· if' ti *~

&bull; · · ti · I 4 ^

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is approximately 13 min, so that the articulation points 19 and 21 of these joint arrangements are on the one hand sufficiently low on the adjustment element body 6 and on the seat support body A*, respectively, and on the other hand the desired slim design of the adjustment element body B and the seat support body ^A1 is given. The same applies to the embodiment according to Fig. 5 and 6, with the proviso that by eliminating the articulation point 19 according to Fig. 3 and 4, further freedom for a slimmer design is gained.

Claims (1)

.S* Protection claims: 1. Arrangement for synchronous adjustment of the inclination of the seat and backrest of a swivel chair or armchair consisting of a . of the swivel chair or armchair, a seat support rigidly attached to which in its front area the seat of the swivel chair or armchair is pivotably mounted about at least one horizontal axis, a backrest and seat inclination adjustment device, to which the backrest support of the swivel chair or armchair is attached on the one hand and which is pivotably mounted on the seat support about a horizontal axis on the other hand, and a locking device for locking the' ,-. Backrest and seat tilt adjustment device from its pivoting movement, whereby the locking device is attached on the one hand to the backrest and seat inclination adjustment device and on the other hand, viewed from the backrest, is hinged to the seat support in front of the central longitudinal axis of the standpipe of the swivel chair or armchair, characterized in that the backrest and seat inclination adjustment device (adjustment element body B) is located behind the central longitudinal axis as viewed from the backrest. axis of the standpipe (1) is pivotally mounted on the seat support (seat support body A, A ¹ ), that the seat (5) of the swivel chair or armchair is articulated in its rear region to the backrest and seat inclination adjustment device (adjustment element body B) and that at least one of the pivot points (5', 17) of the seat (3) has a radial play in relation to the pivot axis (7) of the backrest and seat inclination adjustment device (adjustment element body B) on the seat support (seat support body A, A ^f ). 2. Arrangement according to claim 1, characterized in that the front pivot point (5*) of the seat (3) on the seat support (A) has a radial play in relation to the pivot axis (7) of the backrest and seat inclination adjustment device (B?). 3· Arrangement according to claim 1, characterized in that the rear pivot point (17) of the seat (3) on the backrest and seat inclination adjustment device (B) has a radial play in relation to its pivot axis (7). 4. Arrangement according to claim 1, characterized in that both the front pivot point (5 ¹ ) of the seat (3) on the seat support (A) and the rear pivot point (17) of the seat (3) on the backrest and t 4 ' 4 · 4 ·· Seat inclination adjustment device (B) must have a radial play in relation to the pivot axis (7) of the backrest and seat inclination adjustment device (B). 5. Arrangement according to one of claims 1 to 4, characterized £ characterized in that the radial play is determined by a joint arrangement (17, 18, 19 and/or 5\ 20, 21) is provided. 6. Arrangement according to claim 5, characterized in that the joint arrangement consists of a joint rod (18 or 20) which is attached with one end to the relevant pivot point (17 or 5') of the seat (3) and with its other end at a pivot point (19 or 21) located vertically below on the ₍ Backrest and seat tilt adjustment device (B) or the seat support (A, A ¹ ). 7. Arrangement according to one of claims 1 to 6, characterized in that the bearing point or pivot axis (7) of the backrest and seat inclination adjustment device (B) on the seat support (A, A ^f ) is located in a plane above the articulation point (10) between the seat support (A, A ¹ ) and the locking device (8, 9, 11) for locking the backrest and seat inclination adjustment device (B). &THgr;. Arrangement according to claim 7, characterized in that the bearing point or pivot axis (7) of the backrest and seat inclination adjustment device (B) on the seat support (A, A*) lies in a plane at a clear distance from the underside of the seat (3). 9. Arrangement according to claim 7 or 8, characterized in that the bearing point or pivot axis (7) of the backrest and seat inclination adjustment device (B) on the seat support (A, A') is located approximately halfway up the backrest and seat inclination adjustment device (B) and the seat support (A, A ¹ ). 10. Arrangement according to one of claims 7 to 9, characterized in that the bearing point or pivot axis (7) of the backrest and seat inclination adjustment device (B) is located near the upper end of the standpipe (1). 11. Arrangement according to one of claims 1 to 10, characterized in that the articulation point (10) between the seat support (A _y A*) and the locking device (8, 9, 11) for locking the backrest and seat inclination adjustment device (B) on the seat support (A, A ¹ ) is located near the standpipe (1). 12. Arrangement according to one of claims 5 to 11, characterized - 5- characterized in that the articulation arrangement between the seat (5) and the backrest and seat inclination distribution device (B) and/or the seat support (A, A ¹ ) is produced by an extension or extensions (13 or 4') on the underside of the seat (3), which is or are each connected to articulating rod(s) or arm(s) (! (18 or 20) in an articulated manner (16, 17 or 4'*, 5) which is or are connected at the opposite end to the backrest and seat inclination adjustment device (B) and/or the seat support (A, A ¹ ) in an articulated manner (19 or 21). 13. Arrangement according to one of claims 5 to 12, characterized in that the articulation point (19 and/or 21) of the articulation arrangement(s) (17, 18, 19 and/or 5', 20, 21) on the backrest and seat inclination adjustment device (B) and/or the seat support (A, A ¹ ) is placed as low as its or their construction height allows. 14. Arrangement according to one of claims 1 to 13, characterized in that the front pivot point (3 or 5') of the seat (3) is located in or near the middle of the front half of the seat (5). 13. Arrangement according to one of claims 1 to 14, characterized in that the rear pivot point (17 or 17 ^f ) of the seat (3) is in or near the center of the rear Half of the seat (3). 16. Arrangement according to one of claims 1 to 13» characterized in that the pivot points (17 or 17' and 5 or 5 ¹ ) of the seat (5) and the pivot axis (7) of the backrest and seat inclination adjustment J direction (B) positioned to each other and through the Joint arrangement(s) (5 ¹ , 20, 21 and/or 17, 18, 19) are movable relative to one another so that a synchronous pivoting of the seat (3) and backrest (6) is provided, but with different pivoting angles. 17. Arrangement according to claim 16, characterized in that the backrest (6) can be pivoted through a larger angle than the seat (3). &lgr; 18. Arrangement according to claim 16 or 17, characterized in that the seat (3) can be pivoted by 10° about its front pivot point(s) (5 or 5\21). 19. Arrangement according to one of claims 16 to 18, characterized in that the ratio of the pivot angles of the seat (3) and backrest (6) is approximately 1 & 1.7. 20, Arrangement according to one of claims 16 to ?. .acharacterized in that the ratio of the pivot angles of the seat (3) and backrest (6) is 1:1.68. » · » &psgr;&PSgr; m &aacgr; 21. Arrangement according to one of claims 1 to 20, characterized in that "during the synchronous pivoting movement of the backrest and seat inclination adjustment device (B) and the seat (3), the distance from a point of the backrest (support) (6) to a point of the seat (3) in each position of the pivoting movement C is constant. 22. Arrangement according to one of claims 1 to 21, characterized in that the overall height of the seat support (A, A ¹ ) and the backrest and seat inclination adjustment device (B) is each less than 100 mm. 23· Arrangement according to one of claims 1 to 22, characterized in that the height of the seat support (A, A ¹ ) and the backrest and seat inclination adjustment r direction (B) is less than 90 nnn in each case. 24· Arrangement according to one of claims 1 to 23, characterized in that the overall height of the seat support (A, A') and the backrest and seat inclination adjustment device (B) is each approximately 85 mm. 25· Arrangement according to one of claims 1 to 24, characterized in that the height of the seat support (AO) and/or the backrest adjusting device (B) is less than 85 mm. f I *
I * ·