Seating furniture, particularly office-chair

The present invention relates to a seating furniture, in particular Office swivel chair, with one foot, of which a central column extends upwardly, the center column variable length and / or may be suspended, at a top of the center column firmly attached seat support, with a seat plate to near its front edge a horizontal axis to the seat carrier connected to and by a spring arrangement with a upwardly facing force is biased, and with a Backrest, the extending of at least one upward Lever is attached which in under the seat plate a first pivot point pivotally connected to the seat support and articulated at a distance therefrom in a second pivot point is connected to the underside of the seat plate, wherein parallel both points of articulation to the seat plate swivel axis having pivot axes.

A chair of the aforementioned type is known from US-PS 4,709,962 is known. In such seating used to supporting the backrest, to the seat carrier and the seat plate hinged lever to a coupled Movement of the seat plate and backrest produce. In concrete terms, the coupling is that the backrest when pivoting the seat plate also pivoted, but at a different angle than the Seat plate. The ratio of the swivel angle to each other is in currently known in the market Seating furniture to a predetermined value in the range 2.5 set: between about 1: 1.3 and. 1 With this to construction of the chair in particular achieved be that the user of the chair's position between a raised position with raised Seat plate and about pointing straight backwards backrest and a reclined position with a lowered rear Seat plate and tilted back can assume without the event of a change of the seat position slide down to an unpleasant up or the backrest on the back of the user comes.

Another a relevant seating is from the DE 43 12 113 C1. This document describes a Seating with the front region about a horizontal Swivel axis swiveling, changeable in inclination Seat and a function of the change in inclination the seat forcibly disproportionately in the tilt variable backrest. It is the seat pivotally connected to pivot levers whose one ends carry the backrest and the other ends of the bearing block the chair main body are rotatably supported. The Pivot levers are at a distance from the rear end of the seat articulated on the seat and is rotatably mounted on the bearing block Portions of the pivoting levers are on the up the hinge axis of the seat subsequent sections blunt the pivot lever in a for stand space out Angle. Further, a return spring for automatically Provision of the seat and the backrest of the Rest provided in the working position with body weight support. To the seating furniture on a wide range of To customize user weights, is in this Seating furniture provided that the pivot axis of the pivoting lever against the bearing block is slidably and that the return spring between the bearing block and the bearing block pivoted portions of the pivoting lever arranged and in its installed position against the pivot bearings is such changeable adjustable to that of the spring force of the torque exerted about the pivot axes is changeable. An influence of the ratio between the swivel angle of the seat and the swivel angle the backrest is, however, also in this Seating is not provided.

From DE 44 39 290 A1 is a Synchronverstelleinrichtung Known for office chairs, outdoor furniture and the like, consisting of a seat part, a back part with a attached to a back support or integrated in these Backrest and a fixed support frame, on which the seat part is pivoted, wherein the back-support connected to the seat part and the support frame is and the seat part at a magnification of back inclination pivotal movement performs. To find the number the articulation points and the number of additional connection parts keep low and to the effort involved in Production of such Synchronverstelleinrichtung to reduce, is provided here that the back-support directly with both the seat part and to the supporting frame pivotally connected. In one embodiment, This adjustment is of at least one Pivotal connections a sliding guide for the axis of rotation for superimposing a displacement movement with the rotational movement about the pivot axis provided. hereby is the profile of the synchronous movements of the seat part and the back part with the corresponding guide influenced in the backdrop. is a disadvantage of this Synchronverstelleinrichtung considered that the course of the synchronous motions of the seat part and the back part by the shape of the slot is determined and no longer influenced by the user of the seat can be. Moreover, in the embodying Seating described a synchronous adjustment provided in such a manner that a pivoting of the at Backrest rearward, the seat plate at the rear End is raised and that, conversely, when pivoting the backrest forwards the seat plate back is lowered. This type of synchronous adjustment is no longer regarded as ergonomically.

is in all of these as a disadvantage of the prior Technology known seating furniture considered that due to the fixed ratio between the pivoting angles of the seat plate and backrest are only a compromise different between the various needs Users, particularly within the context of different anatomical conditions occur, be achieved can. The ratio of the tilt angle of the seat plate and backrest in all cases during production set of the seat and is then changed more by the user.

Hence, it is the task of a seating of initially mentioned type, which listed the Disadvantages are avoided and the particular targeted Changing the ratio of the tilt angle of the seat plate and backrest allowed by the seating user, so that the seating better different to the Comfort needs and anatomy different users can be adapted.

This object is achieved by the present invention a seating furniture of the type mentioned, which is characterized is that the length of the lever between the first articulation point and the second articulation point by shifting the first articulation point and / or the second Link point is variable in direction of the lever.

Since the length of the lever between the first and second pivot point for determining the ratio of Tilt angle of the seat plate and backrest, is in this way the advantageous possibility of influencing created the pivot angle ratio. be expedient for moving the first and / or second link point using such technical means, that the displacement by the user of the seat can be made. In this manner, each Members of the chair to him pleasant and matched Ratio of the tilt angle of the seat plate and and set the backrest. In general, it is expected sufficient if either the first or the second pivot point is displaced; if a particularly large Variation of the pivot angle ratio required is, it can also be expedient, both articulation points to make movable.

Embodiments of the seat according to the invention, wherein which the first articulation point is displaced, are in to claims 2 to 5 below.

In the claims 6 to 8 are embodiments of the invention Seating furniture described in which the second pivot point is displaceable.

Regardless of whether the first or the second pivot point Articulation point is displaced or whether both articulation points are displaceable, the backrest can either be rigidly mounted at the upper, free end of the lever or about an axis parallel to the seat plate swivel axis axis oscillating at the upper, free end of the lever articulated be.

The following are two embodiments of the invention Seating furniture using a drawing explained. The drawings are as follows:<dl tsize="9"><dt>figure 1a</dt><dd>a chair in a first embodiment with a first pivot angle ratio Seat panel and backrest in two different Verschwenkungszuständen, schematically Side View,</dd><dt>figure 1b</dt><dd>the chair of Figure 1a, with an amended Pivot angle ratio, in a diagram, as Figure 1a,</dd><dt>figure 2a</dt><dd>the seating in a second embodiment, with a first pivot angle ratio Seat plate and backrest, also in schematic Side View,</dd><dt>figure 2b</dt><dd>the chair of Figure 2a, now second with a Pivot angle ratio, and</dd><dt>2c</dt><dd>the chair of Figure 2a, now third with a Pivot angle ratio.</dd></dl>

According to Figure 1a comprises the embodiment illustrated of a seat 1, here an office swivel chair, Foot 2, a related foot 2 seat carrier 3, a pivotally hinged to the seat carrier 3 seat plate 4 and a backrest fifth

The foot 2 comprises a plurality of generally five arms 20, carrying at its outer end a respective roller 21st With the foot 2 further includes a center pillar 22, the centrally extends upward and the variable in length and / or may be grooved. The foot 2 has a total of of known construction and therefore in the drawing only shown in dotted lines.

The seat support 3 is at its one end 32 with the top of the center column 22 fixed to a being Lifting the seat support 3 to the top of the central column 22 excluded, but a rotation of the seat carrier 3 remains possible to the center pillar 22nd

The seat support 3 has an angle in its course by above, its outer end 34 to connect to the seat plate 4 by means of a pivot axis 43, which in the horizontal direction parallel to the front edge of the seat plate 4 runs, manufactures. The pivot axis 43 is preferred realized by a corresponding joint; alternative , the pivot axis 43 by using a be realized flexible material, the corresponding one Pivotal movement of the seat plate 4 relative to his seat carrier 3 allows. Between the seat support 3 and the seat plate 4, which is not shown in the drawing is, as known per se, a spring element is provided, the facing the seat plate 4 with an upward Force biased. When using the flexible material can this with sufficient elasticity even even muster the spring force.

From the rear, right in the drawing end of the seat plate 4 extends the backrest 5 upwards, but no direct connection between the seat panel 4 and the backrest 5 is. The backrest 5 is Rather, a lever 6 with the remaining part of the Seating furniture 1 connected. The lever 6 is in two pivot points 63 and 64 on the one hand to the seat support and other connected to the seat plate. 4 Here, the Pivot point 63 than in a guide 36 in the seat support 3 movable and lockable articulation element formed. The pivot point 64, however, is fixed at the bottom but 42 of the seat plate 4 attached, a Displacement of the lever 6 in its longitudinal direction through the pivot point 64 through remains possible. In the pivot point 63 is the front left in the drawing End 61 of the lever 6 against movement in the longitudinal direction the lever 6 is set. Right from the second pivot point 64 extends the lever 6 initially beneath the seat panel 4 to the rear, ie in the drawing to the right, and then turns upwards. At its upper end 62 the lever 6 is connected to the backrest 5, wherein For this purpose, in the present embodiment, the backrest 5 about an axis 56 oscillate with the lever end 62 connected is.

The top 41 of the seat plate 4 and the front side 51 of the backrest 5 are upholstered in a conventional manner as well as with a coating, for example of fabric or Leather, provided.

In Figure 1a is in solid lines to a position the chair 1 marked with a raised seat plate 4, in which a user of the chair 1 an erect Attitude occupies. By shifting its weight the user of the chair 1 can his attitude change in the seating furniture 1 and the seat plate 4 against the force of the aforementioned spring element in a move diagonally backward and downward extending position, which is drawn in dashed lines. Of the available for this purpose swivel range of the seat plate 4 is the embodiment shown according to Figure 1a and also in the other figures of the drawing each 12 °.

By connecting the backrest 5 via the lever 6 with the seat plate 4 and the seat carrier 3 on the one hand a transfer of the power of said spring element achieved in the backrest 5 and on the other synchronized movement of the seat panel 4 and backrest 5 causes that in the present embodiment in accordance with Figure 1a is designed so that the backrest 5 is pivoted at the seat plate 4 by 12 ° a swivel angle Previous sets of 21 °. Decisive for the relationship between the tilt angles of the seat panel 4 and backrest 5, the length L of the lever part 60 between the two Pivot points 63 and 64. In the state shown in Figure 1a is the pivot point 63 on the left end of the guide 36 set in the seat support. 3 To change the pivot angle ratio between the seat panel 4 and backrest 5 can the articulation point 63 shifted in its guide 36 , whereby Figure 1b now a state of the seat 1 shows, in which the articulation point 63 to the right upper End of the guide 36 is moved and fixed there. changed This displacement of the pivot point 63 the length L to a smaller degree. This reduction of length L with the result that with the same pivoting the seat plate 4, here again by 12 °, the Backrest 5 now covers a larger swing angle in this example 28 ° now.

leaves The seating 1 according to figure 1a and 1b from So by shifting the pivot point 63 one end of its guide 36 to the other end of the Swivel angle between the pivoting angles of Seat panel 4 and backrest 5 is between about 1: 1.75 and 1: 2.3 change. The pivot point 63 is expediently realized by such technical means, that the user of the chair 1 itself the displacement within the guide 36 and the locking in the desired position can make. Thus, the Members of the chair 1 this to his comfort needs optimally adapted and anatomical relationships.

Figures 2a to 2c show an embodiment of the seating furniture 1, in which, in contrast to the previous example according to Figure 1a and Figure 1b is now the second pivot point 64 in its position is changed while the first pivot point 63 fixed to the seat support 3.

According to Figure 2a also includes this embodiment of the seat 1, which is an office swivel chair again, a conventional foot 2, top at the end of the seat support 3 is attached with its lower end 32nd The Seat plate 4 is again about the pivot axis 43 articulated or with equivalent effect flexibly to the seat support 3 connected to the free end of the 34th Behind the Seat plate 4 again extends the backrest 5 up.

The compound of the backrest 5 with the remaining part the chair 1 also assumes again a lever 6, the underneath of the seat plate 4 on its underside 42 runs and upwards behind the seat plate 4 and is bent there at its free end 62 of the Backrest 5 supports. Here again a pendulum Connection provided with an axle 56th

To make the second pivot point 64 adjustable, is in this seating 1 at the bottom 42 of the seat plate 4, a guide 46 is provided, along which the as Pivoting element formed second pivot point 64 displaced and in desired positions can be fixed. The lever 6 extends through the second pivot point 64 therethrough, a relative movement between the lever 6 and the articulation point 64 remains possible in the longitudinal direction of the lever.

The front end 61 of the lever 6 is in the first pivot point 61 about a horizontal axis, parallel to the Pivot axis 43 runs, movably, otherwise but secured against motion in other directions.

Also in this seating 1 results from the compound the backrest 5 via the lever 6 to the seat plate 4 and the seat carrier 3 a synchronized movement of Seat panel 4 and backrest 5, when the seat plate 4 is lowered by stress from a user. decisive for the pivoting angle between the seat plate 4 and backrest 5 is again the length L of the lever part 60 between the two pivot points 63 and 64. In the state shown in Figure 2a is the second pivot point 64 and the coupling element forming this in its guide 46 until approximately reclining Stop moved, whereby the length L approximately its maximum possible value is replaced. With this position of second articulation point 64 results in a pivoting angle the seat plate 4 of 12 ° for the backrest 5 a tilt angle of 16 °. In this case, the pivoted Position of the seat panel 4 and backrest 5 in Figure 2a and dashed in the other figures in Lines shown.

In Figure 2b, the seating is 1 of Figure 2a with a approximately central position of the second articulation point 64 shown in its guide 46, whereby the length L has an average value of the potential for the length L Values ​​occupies. In this setting, the second pivot point 64 arises in the present embodiment when pivoting the seat plate 4 by 12 ° so that a -coupled pivoting of the backrest 5 by 18 °.

Figure 2c shows finally the chair 1 of Figure 2a and now 2b with a third position of the second pivot point 64, in this as far as possible within his leadership has moved 46 forward. The length L achieved hereby approximate their minimum possible value, which results in that when pivoting the seat plate 4 at 12 °, the backrest 5 pivoting about 22 ° performs.

As is illustrated in Figures 2a to 2c also occurs during pivoting of the backrest 5 simultaneously a certain reduction relative to the seat plate 4 on what perceived by the user of the seat 1 as particularly pleasant is, as this sliding movements of the backrest 5 are avoided relative to the user's back.

Also in the seating furniture 1 according to figure 2a-2c is the the second pivot point 64 forming pivoting element together formed with its guide 46 so that a user of the seat 1, the displacement and fixing the make link point 64 within the guide 46 itself can. Preferably, the formation is such that for the adjustment no tools required, but that only a handwheel or a lever actuated must, as per se eg from manual height adjustment or backrest adjustment of seats, in particular Office chairs, is known.

Since the guide 46 at the bottom 42 of the seat plate 4 be made relatively easily with great length may be a correspondingly large variation range results for the length L and therefore also correspondingly large Variation range of the swing angle between Seat panel 4 and backrest 5. In the example lä according 2a to 2c ßt by shifting the Articulation point 64, the pivot angle ratio about 1: 1.3 to 1: 1.8 vary. Even greater variation ranges be possible if the range of variation the length L is additionally increased, either by Extension of the guides 36 and / or 46 or by using two displaceable pivot points 63 and 64th

To limit the production outlay is preferred 6, a single lever is used, the expedient approximately centrally below the seat and behind the plate 4 Backrest 5 runs. Alternatively, a pair of of mirror symmetry on the left and right seating 1 arranged levers are used, the two Lever 6 then also over part of its length next to the Seat plate 4 or extend directly to the edge region can in terms of accessibility for the shift the pivot points can be improved 63 and 64th also offers different design and arrangement the lever 6 or the lever 6 manifold design Possibilities for the outer appearance of the seat 1.