EP3085273B1 - Office chair - Google Patents

Description

The invention relates to an office chair with a seat, a backrest and a frame, wherein the office chair is designed as a cantilever and the seat is connected via a frame to the frame, and wherein the frame has two support legs.

Office chairs are known in numerous embodiments. These office chairs for the user on a seat and a backrest, on which he should sit comfortably and fatigue-free and lean against. In order to be able to adapt the height of the office chair to the size of the user, the frame carrying the seat is usually height-adjustable.

The US 2004/0113471 A1 discloses an office chair with seat, back and frame, wherein the seat is connected via a frame formed by two C-shaped support legs with the frame.

The WO2014 / 030057 A1 discloses a chair constructed as a cantilever in which the frame is attached to the underside of the seat.

In the from the DE 20 2008 011 303 U1 Known chair, the seat is connected via a spring clip with the four-legged frame.

From the DE 20 2014 006 831 U1 are known as cantilever chairs, where the front edge of the seat in one piece into the frame. Moreover, from the DE 20 2012 100 257 U1 a chair is known in which the backrest is mounted on the frame. When in the DE 203 00 669 U1 The cantilever shown is the frame frame-like, so that in these a seat can be integrated. However, all variants have the disadvantage that the chairs are not usable as office chairs, since they have no height adjustment. In addition, the damping and suspension takes place exclusively on the standing on the ground frame, which must be flexible accordingly.

The invention is therefore based on the object, an office chair of the type mentioned in such a way that it has a rigid frame, with which he is adjustable in height, and that the office chair is still comfortable and the seat is swinging.

This object is achieved in that the support legs are supported by damping elements.

An essential feature is that the office chair has a frame independent of the frame. The frame can therefore be designed as desired and have the rigidity required for an office chair. In the frame, e.g. Also be accommodated a height adjustment, which can be additionally equipped with a suspension and a damping. Usually this gas springs are used. The elastic element is thus formed by the frame, which serves as a support for the seat and the backrest. The office chair according to the invention thus represents a cantilever.

The frame has according to the invention on two support legs. These support legs form the supports for the seat and the holder for the backrest. There can be any kinds and forms the seat and the backrest to be mounted on the support and the bracket. They can be rigid or flexible and possibly also damped and mounted or secured in different positions on the support and the bracket.

An embodiment of the invention provides that the support legs are connected together at their lower ends. The ends of the support legs can be connected directly or indirectly. In any case, they form one rigid framework and a support base for the frame, on which the seat and the back support. The frame is a self-supporting unit that is rigid in sections and flexible in other areas.

Advantageously, a cross member is provided for connecting the lower ends of the support legs, in addition, a bridge may be present. The cross member serves as a point of articulation for the upper end of the frame and may also have a rotating and / or tilting bearing for the frame, so that it can be adjusted relative to the frame with different angles of inclination.

In a further development of the invention, it is provided that each support leg extending from the frame in the direction of the backrest foot, adjoining the foot and in the direction of the front edge of the seat extending spring portion, one adjoining the spring portion and in the direction of Backrest extending and receiving the seat support portion and a subsequent to the support portion and the backrest supporting back portion has. The frame thus has a foot connected to the frame, which is followed by a spring section, a support section and finally a rear section. These elements merge into one another via one or more folds.

A particularly preferred variant provides that the frame, in particular the foot and the sections, are cut out of a plate, in particular by means of a laser cutting device, and then folded. When using a laser, high precision finish cuts can be made without overheating the area around the cut and component. The cut-out semi-finished elements can be stored to save space and then fed to the bending device. Both the cutting and bending processes can be automated as far as possible.

In order to give the office chair, in addition to its rigidity, a degree of flexibility and impact absorption, the supporting legs are supported by damping elements. These damping elements transmit the impact forces directly or indirectly into the frame. Thus, the characteristics of a cantilever can be combined with the advantages of a certain damping.

In order to optimally damp the cantilever, it mobility, in particular the tiltability, but not limit, the damping elements are supported on the cross member or on the bridge. The forces are thus supported directly on or in the immediate vicinity of the frame. Occurring bending elements within the frame therefore remain minimal.

To stiffen the support legs and maintain their position and position to each other is provided that the support legs are connected to each other by means of a transverse strut, in particular below the seat. The support legs remain in exactly the desired distance from one another and transverse forces do not have to be transmitted through the seat or the fasteners required for this purpose.

Advantageously, the damping elements are supported on the cross brace. Due to the optimal placement of the cross brace on the support legs and a freely selectable position for the damping elements they can be aligned exactly in the direction of the forces occurring.

A high rigidity on the one hand and compliance in the elastic portions of the entire office chair on the other hand is achieved in that the frame made of metal, in particular spring steel. The use of spring steel gives the office chair the characteristics of a cantilever, the office chair also has a rigid frame with suspension and damping and the height adjustment by the Gestellt.

To increase the stiffness in assisted areas, e.g. for the seat and / or the backrest, the frame is provided with one or more beads and / or Längsabkantungen. Thus, these rigid areas can be specifically excluded from the suspension.

In order to keep the introduction of heat when joining in adjacent areas as low as possible, it is provided that the individual parts of the frame are welded together by means of a laser welding device. In addition, the elastic properties of the spring steel remain unchanged.

Advantageously, a further decoupling of seat and frame is achieved in that the seat by means of several dampers, in particular rubber buffer, is attached to the frame. As a result, vibrations can be absorbed both in the high and in the low-frequency range on the one hand and on the damper on the other hand.

Further advantages, features and details of the invention will become apparent from the claims and the following description in which, with reference to the drawing, a particularly preferred embodiment of the invention will be described in detail.

Figur 1

eine Seitenansicht eines erfindungsgemäßen Bürostuhls;

Figur 2

eine vergrößerte Wiedergabe des Ausschnitts II gemäß Figur 1 von schräg hinten;

Figur 3

eine vergrößerte Wiedergabe des Ausschnitts II gemäß Figur 1 von hinten;

Figur 4

eine vergrößerte Wiedergabe des Sitzbereiches ohne Sitz;

Figur 5

eine vergrößerte Wiedergabe des Sitzbereiches mit Sitz; und

Figur 6

eine vergrößerte Wiedergabe des Sitzbereiches mit Sitz und Poster.

In the drawing show:

FIG. 1

a side view of an office chair according to the invention;

FIG. 2

an enlarged view of the section II according to FIG. 1 from diagonally behind;

FIG. 3

an enlarged view of the section II according to FIG. 1 from the back;

FIG. 4

an enlarged view of the seating area without a seat;

FIG. 5

an enlarged view of the seating area with seat; and

FIG. 6

an enlarged view of the seating and poster seating area.

The FIG. 1 shows a side view of an office chair 10 generally designated, which has a telescopic frame 12 with a foot turnstile 14, a seat 16 and a backrest 18. The frame 12 is connected via a frame 20 both to the seat 16 and to the backrest 18. The lower end 22 of the frame 20 is rotatably and / or tiltably adjustable and / or lockable mounted on the upper end of the frame 12. Further, it can be seen that the seat 16 has a seat cushion 24 and the backrest 18 has a back cushion 26, with the front end 28 of the seat cushion 24 following the frame 20 downwardly and supporting the knees of the user.

The FIG. 2 shows essentially the frame 20, which has, inter alia, two support legs 30, they strip-shaped or band-shaped below the seat 16 and behind the backrest 18 extend. The support legs 30 are formed by a foot 32, a spring portion 34, a support portion 36 and a back portion 38. The foot 32 and the individual sections 34 to 38 are strip-shaped or band-shaped cut and folded several times, ie provided with folds 40, 42, 44 and 46.

Out FIG. 3 showing substantially the rear view of the frame 20 and the support legs 30, it can be seen that at each support leg 30, the lower end 22 of the foot 32 is bent over the fold 46 vertically upwards and has a mounting plate 48. The opposite support leg 30, which is mirror-symmetrical, thus also has a mounting plate 48, so that the mounting plates 48 face each other.

At this attachment plates 48, a cross member 50 is welded by means of a laser welding device and forms the receptacle for the upper end of the frame 12. Side next to the cross member 50 is welded to the two upper edges 52 of the mounting plates 48, a bridge 54, which serves as a support bearing 56 for two damping elements 58 serves. These two damping elements 58 engage on a transverse strut 60, which connect the two support portions 36 of the two support legs 30, which is explained in more detail below, among other things.

The FIG. 4 shows the frame 20 from the front and it can be seen that at the lower end 22 of the frame 20, the two mounting plates 48 are relatively close to each other and are supported by the cross member 50. About the fold 46, the distance of the feet 32 increases to the rear, with over the fold 40, the distances between the two spring portions 34 forward again increased up to the distance between the two support portions 36. In order to fix their distance, the support portions 36 are provided in the rear third with the cross member 60, wherein 36 between the cross member 60 and the support sections damper 62, in particular rubber buffer, interposed, ie screwed. Along the respective outer longitudinal edge 64 is on the upper side of the support portions 36 each have a clamping protection strip 66 which is bent inwards at the rear end and extends over the entire width of the support portions 36. Finally, two damper 68 are still screwed on the top of the support portions 36 at the front and at the rear end.

The FIG. 5 shows the seat 16, the deep-drawn shell-shaped, at its side edges upwardly bent pad strips 70 and is open like a blade like a forward. Thus, on this seat 16, as in FIG. 6 shown, the seat cushion 24 are mounted, in particular clipped, being held laterally from the cushion strips 70, wherein the front end 28 of the seat cushion 24 follows the frame 20 along the fold 42 down. It is in FIG. 5 Still recognizable that the seat 16 is screwed by means of the damper 68 to the support portions 36 and holds the support portions 36 at a distance and stiffened.

The two feet 32 and the support portions 36 are relatively stiff due to the cross member 52 and the bridge 54 and the bolted seat 16 and the crossbar 60, whereas the two spring portions 34 are resilient over the entire length and give the Rahen 20 the feature of a cantilever. This also applies in part to the spine portions 38, the lower portion of which being elastically formed but whose upper portion is fastened to the backrest 18.

The backrest 18 can thus perform low tilting tendencies to the rear.

Claims (12)

1. Office chair (10) with a seat (16), a backrest (18) and a stand (12), wherein the office chair (10) is in the form of a cantilever chair and the seat (16) is connected to the stand (12) via a frame (20), and wherein the frame (20) has two support legs (30), characterised in that the support legs (30) are supported by damping elements (58).
2. Office chair according to claim 1, characterised in that the support legs (30) are joined together at their lower ends (22).
3. Office chair according to claim 2, characterised in that a cross-piece (50) and/or a bridge (54) are or is provided to join the lower ends (22) of the support legs (30).
4. Office chair according to any of the preceding claims, characterised in that each support leg (30) has a foot (32) extending from the frame (20) in the direction of the backrest (18), a spring section (34) adjoining the foot (32) and extending in the direction of the front edge (28) of the seat (16), a support section (36) adjoining the spring section (34) and extending in the direction of the backrest (18) and holding the seat (16), together with a back section (38) adjoining the support section (36) and supporting the backrest (18).
5. Office chair according to claim 4, characterised in that the frame, in particular the foot (32) and the sections (34, 36, 38), are cut out from a plate, in particular by means of a laser cutting unit, and then folded.
6. Office chair according to any of claims 3 to 5, characterised in that the damping elements (58) are supported on the cross-piece (50) or on the bridge (54).
7. Office chair according to any of the preceding claims, characterised in that the support legs (30) are joined to one another by means of a cross strut (60), in particular below the seat (16).
8. Office chair according to claim 6 and 7, characterised in that the damping elements (58) are supported on the cross strut (60).
9. Office chair according to any of the preceding claims, characterised in that the frame (20) is made of metal, in particular of spring steel.
10. Office chair according to any of the preceding claims, characterised in that the frame (20) is provided with one or more beads and/or longitudinal flanges.
11. Office chair according to any of the preceding claims, characterised in that the individual parts of the frame (20) are welded together by means of a laser welding unit.
12. Office chair according to any of the preceding claims, characterised in that the seat (16) is fastened to the frame (20) by means of several shock absorbers (68).

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