Chair

Abstract

The invention relates to a chair, in particular an office chair, comprising a base frame with a foot column (4) on which a seat element frame (8) is mounted via a base support (6) connected to the foot column (4). The base support (6) comprises two upper struts (10, 12), two lower struts (14, 16) and a connecting strut (18). The connecting strut (18) connects the upper struts (10, 12) and the lower struts (14, 16) to one another and the upper struts (10, 12) to the lower struts (14, 16). When projected in the vertical direction (z) of the chair, the lower struts (14, 16) each cross a respective one of the upper struts (10, 12). The base support (6) is elastically deformable such that the upper struts (10, 12) can be brought closer to the lower struts (14, 16) in the chair vertical direction (z) and / or can be brought into contact with a respective one of the lower struts (14, 16), so that a seat tilting mechanism is formed.

Description

[0001] The invention relates to a chair, in particular an office chair, comprising a base frame with a foot column. A seat element is mounted on the foot column via a base support connected to the foot column.

[0002] Chairs with a base frame, a base support, and a seat element are known in practice. These typically feature a seat tilting mechanism. The seat tilting mechanism comprises a lower plate connected to the base frame, a top plate to which the seat element is attached, and a spring mechanism. The lower plate and top plate can be tilted relative to each other, with the tilting movement counteracting the force of a spring mechanism. Examples of prior art chairs are described in DE 10 2020 103 226 A1 and DE 10 2017 103 651 A1.

[0003] Providing a seat tilt mechanism for the chairs we know from practice requires a multitude of components. As a result, assembly of these chairs is often complex.

[0004] The invention is based on the object of creating a chair which provides a seat tilt mechanism in a structurally simple manner with few components and is thus easy to assemble.

[0005] This object is achieved according to the invention by the chair having the features of patent claim 1.

[0006] According to the invention, a chair, in particular an office chair, is provided which comprises a base frame with a foot column. A seat element is mounted on the foot column via a base support connected to the foot column. The base support is elastically deformable and comprises two upper struts, two lower struts and a connecting strut. The connecting strut connects the upper struts to one another, the lower struts to one another and the upper struts to the lower struts. When projected in the vertical direction of the chair, the lower struts each cross a respective one of the upper struts. The base support is elastically deformable such that the upper struts can be brought closer to the lower struts in the vertical direction of the chair and / or into contact with a respective one of the lower struts. This creates a seat tilting mechanism or seat tilting mechanism.

[0007] The core idea of ​​the invention is therefore to provide the chair with an elastically deformable base support with a geometry such that the seat element can be tilted. To implement a seat tilt option, no additional spring mechanism is required in the chair according to the invention. Rather, seat tilt is enabled by the elastic design of the base support itself, which simultaneously mounts the seat element to the base frame.

[0008] In an elastically non-deformed state of the base support, the upper struts are spaced apart from the lower struts in the vertical direction, for example, in particular in an alignment area in which the upper struts are aligned with the lower struts in the vertical direction.

[0009] The upper struts, the lower struts and / or the connecting strut of the base support are, for example, elastically deformable, whereby in particular the other elements of the base support are not elastically deformable.

[0010] In a preferred embodiment of the chair according to the invention, the lower struts extend from the connecting strut outwards in the transverse direction of the chair and forwards in the longitudinal direction of the chair, i.e. diagonally forwards and outwards.

[0011] In an elastically non-deformed state of the base support, the lower struts can extend upwards in the vertical direction, in particular obliquely, starting from the connecting strut.

[0012] In an exemplary embodiment according to the invention, the upper struts extend from the connecting strut outwards in the transverse direction of the chair and backwards in the longitudinal direction of the chair, i.e. diagonally backwards and outwards.

[0013] In an elastically non-deformed state of the base support, the upper struts extend upwards from the connecting strut, for example in the vertical direction of the chair, in particular diagonally.

[0014] In a preferred embodiment of the chair according to the invention, the base support is formed in one piece.

[0015] The base support, for example, is a plastic injection-molded part.

[0016] In an exemplary embodiment, the chair according to the invention comprises at least two stop elements. The stop elements are each arranged on one of the upper struts or on one of the lower struts in such a way that they can be brought into contact with a respective one of the lower struts or a respective one of the upper struts through elastic deformation of the base support, particularly in an area where, when projected vertically, the lower struts each cross a respective one of the upper struts. Thus, a maximum seat tilt angle can be limited.

[0017] In a preferred embodiment of the chair according to the invention, the upper struts and the lower struts each comprise a support element at an end region facing away from the connecting strut.

[0018] The seat element can rest on or be mounted on the support elements.

[0019] In particular, the seat element can be fixed to the support elements on the base support.

[0020] In a preferred embodiment of the chair according to the invention, support surfaces of the support elements, ie the upper sides of the support elements which face the seat element, are arranged in the same plane.

[0021] In an exemplary embodiment of the chair according to the invention, the support elements each comprise a through-hole. The seat element, in particular a seat element frame of the seat element, has four blind holes or four additional through-holes into which screws arranged in the through-holes can be screwed to fix the seat element to the base support.

[0022] For example, the through holes and the blind holes or the further through holes extend essentially in the vertical direction of the chair.

[0023] In a preferred embodiment of the chair according to the invention, four support counter elements are arranged on the seat element, in particular the seat element frame.

[0024] The support counter elements extend, for example, from the seat element frame inwards.

[0025] For example, the support counter elements are formed as one piece with the seat element frame.

[0026] The seat element, for example, is mounted on the support counter elements on the base support.

[0027] The seat element frame can be constructed in one piece.

[0028] For example, the seat element comprises a fabric or a mesh fabric with which the seat element frame is covered, so that a seat surface and / or a back surface are or are formed.

[0029] In an exemplary embodiment, the chair according to the invention comprises a connecting element. The base element is connected to the foot column via the connecting element.

[0030] The connecting element is arranged, for example, on the connecting strut, in particular the underside of the connecting strut.

[0031] The connecting element can be cylindrical, with the axis of the cylinder extending in the vertical direction of the chair.

[0032] In a preferred embodiment of the chair according to the invention, the lower struts together with the region of the connecting strut connecting the lower struts to one another have a V-shaped profile or a U-shaped profile.

[0033] The upper struts, together with the area of ​​the connecting strut that connects the upper struts, may have a V-shaped profile or a U-shaped profile.

[0034] In an exemplary embodiment of the chair according to the invention, the connecting strut extends from the lower struts obliquely forwards in the longitudinal direction of the chair and upwards in the vertical direction of the chair.

[0035] In an exemplary embodiment, the chair according to the invention comprises two spring elements. The spring elements each connect an upper strut to a corresponding one of the lower struts.

[0036] The spring elements connect the upper struts to the lower struts, for example in an area in which the upper struts cross the respective lower struts when projected in the vertical direction of the chair, in particular in the elastically non-deformed state or in an elastically deformed state of the base support.

[0037] The spring elements, for example, are each elastically deformable and thus form a kind of damping element.

[0038] Further advantages and advantageous embodiments of the subject matter of the invention can be found in the description, the drawings and the patent claims.

[0039] An embodiment of a chair according to the invention is shown schematically in the drawing and is explained in more detail in the following description. It shows: Fig. 1 a perspective view of a portion of a chair according to the invention in an assembled state; Fig. 2 a perspective view of a base support, a portion of a seat element frame and screws of the chair according to Fig. 1 in a non-assembled state; Fig. 3 a Fig. 2 corresponding view in a partially assembled state; Fig. 4 a perspective partial view of the base support of the chair according to Fig. 1; Fig. 5 a further perspective partial view of the base support of the chair according to Fig. 1; Fig. 6 a sectional view along line V - V in Fig. 5, wherein the base support is in a forwardly inclined position; Fig. 7 a Fig. 6 corresponding view, with the base support in a neutral position; and Fig. 8 a Fig. 6 corresponding view, with the base support in a backward tilted position.

[0040] Fig. 1 shows a portion of a chair 2 according to the invention.

[0041] The chair 2 comprises a base frame with a base column 4, a base support 6, and a seat element with a seat element frame 8. The base support 6 is mounted on the base column 4. The seat element 8 is in turn mounted on the base support 6.

[0042] As can be seen in particular from the Fig. 4 and Fig. 5, in which the base support 6 is shown in isolation, the base support 6 comprises two upper struts 10 and 12, two lower struts 14 and 16 and a connecting strut 18.

[0043] The upper struts 10 and 12 are connected to each other at mutually facing first ends via the connecting strut 18. Starting from the connecting strut 18, the first struts 10 and 12 each extend backward in the chair's longitudinal direction y, outward in the chair's transverse direction x, i.e., away from each other, and upward in the chair's vertical direction z. In a top view or a bottom view, the upper struts 10 and 12, together with a region of the connecting strut 18 that connects the upper struts 10 and 12, form a V-shaped profile.

[0044] The lower struts 14 and 16 are also connected to one another at mutually facing first ends via the connecting strut 18. The lower struts 14 and 16 extend from the connecting strut 18 forward in the chair's longitudinal direction y, outward in the chair's transverse direction x, and upward in the chair's vertical direction z, so that the lower struts 14 and 16, together with a region of the connecting strut 18 connecting the lower struts 14 and 16, also have a V-shaped profile in a top view or a bottom view.

[0045] The connecting strut 18 extends in the chair's longitudinal direction y and in the chair's vertical direction z. Starting from the lower struts 14 and 16, the connecting strut runs diagonally forward and upward toward the upper struts 10, 12. The section of the connecting strut 18 connecting the upper struts 10 and 12 is thus located above the section connecting the lower struts 14 and 16 in the chair's vertical direction z.

[0046] In a projection in the chair vertical direction z, the lower struts 14 and 16 each cross a respective one of the upper struts 10 and 12, respectively, wherein the upper struts 10, 12 are arranged above the lower struts 14, 16 in the chair vertical direction z.

[0047] The base support 6 is elastically deformable. In an elastically non-deformed state of the base support 6, the upper struts 10 and 12 are spaced apart from the lower struts 14 and 16 in the vertical direction z, particularly in the area in which the lower struts 14 and 16 each intersect a respective one of the upper struts 10 and 12 when projected in the chair vertical direction z. By elastically deforming the base support, the upper struts 10 and 12 can be brought closer to the lower struts 14, 16 in the chair vertical direction z. This creates a seat tilt mechanism.

[0048] In the areas in which the lower struts 14 and 16 each cross a respective one of the upper struts 10 and 12 when projected in the chair vertical direction z, a stop element 20 is provided on each of the lower struts 14, 16.

[0049] It is also conceivable to arrange the stop elements 20 on the underside of the upper struts 10 and 12.

[0050] As can be seen from the Fig. 6 to 8 shown sectional views along line V - V in Fig. 5, the upper struts 10 and 12 each have a first through-bore 32 with an internal thread in the area in which they intersect with a respective one of the lower struts 14 and 16 when projected in the chair vertical direction z. The lower struts 14 and 16 each also have a second through-bore 34 with a screw head countersunk hole 36. The second through-bores 34 are each aligned in the axial direction with a respective one of the first through-bores 32. Furthermore, the stop elements 20 each comprise a third through-bore 40, which is aligned in the axial direction with a respective one of the first through-bores 32 and a respective one of the second through-bores 34.

[0051] A partially threaded screw 38 is screwed into each of the first through-holes 32 and extends through a respective one of the third through-holes 40 and through a respective one of the second through-holes 34, wherein the screws 38, in particular their screw head and a thread-free section of the screws 38, are movable in the axial direction of the screws 38 relative to the respective lower strut 14 or 16 and the respective stop element 20.

[0052] As in Fig. As shown in Figure 6, when the base support 6 is tilted or tipped forward and thus the seat element frame 8 is tilted forward, the screw heads rest on a floor bordering the screw head recess 36. The upper struts 10 and 12 are spaced apart from the stop elements 20.

[0053] If the base support 6 and therefore also the seat element frame 8, as in Fig. As shown in Figure 7, in a neutral position, in which a seating surface of the base support 6 extends, in particular, substantially horizontally, the screw heads are each spaced from the bottom of a respective one of the screw head countersunk holes 36 and are arranged entirely within the screw head countersunk holes 36, thus not protruding from the screw head countersunk holes 36. The upper struts 10 and 12 can rest on the stop elements 20, but in particular do not deform them elastically.

[0054] In Fig. 8, the base support 6 is shown in a rearwardly tilted position. In this position, the screw heads are each spaced further from the bottom of a respective one of the screw head countersunk holes 36 than in the neutral position. In particular, the screws 38, in particular their screw heads, but not their unthreaded portions, protrude from the screw head countersunk holes 36. The stop elements 20 can be elastically deformed, in particular compressed.

[0055] The upper struts 10, 12 and the lower struts 14, 16 each have a support element 22 at an end facing away from the connecting strut 18. Support surfaces of the support elements 22, which face the seat element frame 8, are arranged in the same plane.

[0056] As can be seen in particular from the Fig. 2 and Fig.3, the seat element frame 8 has support counter elements 28 corresponding to the support elements 22. The support elements 22 each comprise a fourth through-bore 24. To fix the seat element frame 8 to the base support 6, screws 26 arranged in the fourth through-bores 24 can be screwed into blind holes or fifth through-bores of the support counter elements 28.

[0057] The base support 6 further comprises a connecting element 30. The connecting element 30 is arranged on an underside of the connecting strut 18, is cylindrical in shape, and extends downward in the vertical direction z of the chair. The foot column 4 for securing the base support 6 to the base frame is accommodated in the connecting element 30.

[0058] The base support 6 is constructed as a single piece. Specifically, the base support is a plastic injection-molded part.

[0059] The seat element frame 8 is also designed as a single piece, in particular as an injection-molded plastic part. The seat element frame 8 can be covered with a fabric (not shown) or a mesh (not shown) to form a seat surface and a back surface. List of reference symbols: 2 chairs 4 Foot column 6 base supports 8 seat element frames 10 upper strut 12 upper strut 14 lower strut 16 lower strut 18 Connecting strut 20 stop element 22 support element 24 fourth through hole 26 Screw 28 support counter elements 30 connecting element 32 first through hole 34 second through hole 36 Screw head countersink 38 Partially threaded screw 40 third through hole x Chair cross direction y chair lengthwise direction z Chair height adjustment

Claims

[1] Chair, comprising a base frame with a foot column (4) on which a seat element is mounted via a base support (6) connected to the foot column (4), characterized by in that the base support (6) comprises two upper struts (10, 12), two lower struts (14, 16) and a connecting strut (18), wherein the connecting strut (18) connects the upper struts (10, 12) and the lower struts (14, 16) to one another and the upper struts (10, 12) to the lower struts (14, 16), wherein in a projection in the chair vertical direction (z), the lower struts (14, 16) each cross a respective one of the upper struts (10, 12), wherein the base support (6) is elastically deformable in such a way that the upper struts (10, 12) can be brought closer to the lower struts (14, 16) in the chair vertical direction (z) and / or can be brought into contact with a respective one of the lower struts (14, 16), so that a seat tilting mechanism is formed. [2] Chair according to claim 1, characterized bythat the lower struts (14, 16) extend outwards from the connecting strut (18) in the chair transverse direction (x) and forwards in the chair longitudinal direction (y) and / or the upper struts (10, 12) extend outwards from the connecting strut (18) in the chair transverse direction (x) and backwards in the chair longitudinal direction (y). [3] Chair according to claim 1 or 2, characterized by that the upper struts (10, 12) and / or the lower struts (14, 16) extend upwards from the connecting strut (18) in the chair vertical direction (z). [4] Chair according to one of claims 1 to 3, characterized by that the base support (6) is formed in one piece. [5] Chair according to one of claims 1 to 4, characterized by that the base support (6) is a plastic injection-molded part. [6] Chair according to one of claims 1 to 5, characterized byat least two stop elements (20), which are each arranged on one of the upper struts (10, 12) or one of the lower struts (14, 16) in such a way that they can be brought into contact with a respective one of the lower struts (14, 16) or a respective one of the upper struts (10, 12) by elastic deformation of the base support (6). [7] Chair according to one of claims 1 to 6, characterized by that the upper struts (10, 12) and the lower struts (14, 16) each comprise a support element (22) on which the seat element rests at an end region facing away from the connecting strut (18). [8] Chair according to claim 7, characterized by that support surfaces of the support elements (22) which face the seat element are arranged in the same plane. [9] Chair according to one of claims 7 or 8, characterized bythat the support elements (22) each comprise a through-bore (24) and the seat element comprises four blind holes into which screws (26) arranged in the through-bores (24) can be screwed in order to fix the seat element to the base support (6). [10] Chair according to one of claims 1 to 9, characterized by that on a seat element frame (8) of the seat element four support counter elements (28) extending inwards from the seat element frame (8) are arranged, on which the seat element frame (8) is mounted on the base element. [11] Chair according to one of claims 1 to 10, characterized by that the connecting strut (18) comprises a connecting element (30) via which the base element is connected to the base column (4). [12] Chair according to claim 11, characterized by that the connecting element (30) is cylindrical and extends downwards from the connecting strut (18) in the chair vertical direction (z). [13] Chair according to one of claims 1 to 12, characterized by that the lower struts (14, 16) each have a V-shaped profile or a U-shaped profile in a plan view and / or the upper struts (10, 12) each have a V-shaped profile or a U-shaped profile in a plan view. [14] Chair according to one of claims 1 to 13, characterized by that the connecting strut (18) extends from the lower struts (14, 16) obliquely forwards in the longitudinal direction (y) of the chair and upwards in the vertical direction (z). [15] Chair according to one of claims 1 to 14, characterized by two elastically deformable spring elements, each of which connects one of the upper struts (10, 12) to a respective lower strut (14, 16) in a region in which the upper strut (10, 12) crosses the respective lower strut (14, 16) in a projection in the chair vertical direction (z).

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