ES2355791T3 - FOLDING BACKUP. - Google Patents

Abstract

The backrest (10) has a shoulder area (12), a lordosis area (13) and a pelvic area (14), where the backrest is connected to a rigid backrest frame (30) at upper and lower connecting elements designed as a pivot bearing (20) and a slide bearing (25), respectively. The pivot bearing is fastened below the area (12), so that an upper part of the backrest is inclinable to the front or the rear with respect to the frame. The slide bearing is fastened to a rear side of the backrest and in the area (14), which is freely movable in a vertically upward or downward manner with respect to the frame.

Description

FIELD OF THE TECHNIQUE

The present invention relates to a folding backrest, especially for an office seat, with a shoulder area, a lordosis area and a pelvis area, in which the backrest is flexible in at least one area and 5 is connected to a rigid backing frame at least in one upper and lower link element, in which the upper link element is formed in the form of a rotating landing and the lower link element in the form of a sliding link, and in which the flexibility of the backrest is increased in the lordosis zone, so that the lordosis zone is curved by torsion.

STATE OF THE TECHNIQUE 10

An office seat with synchronized mechanism and folding backrest is available in the market. This office chair features a rigid padded padding support, which extends from the pelvis area to the shoulder area. In addition, the backrest features a filler support for a flexible neck support, which is held on a rotating landing in a backrest frame. The padding support is in turn attached in the pelvis area to the backrest frame. When the person sitting in the chair reclines, the backrest and the backrest frame rest back. 15 With this, the shoulder area of the backrest sinks in relation to the backrest frame. The neck support is held by the backrest frame and pressed slightly forward in relation to the shoulder area of the backrest and thus supports the head.

The filling support and the neck support make a type of valve movement. The backrest adapts to the partially movement of the person, who sits and reclines in the chair. Except for the shoulder and nape area 20, the backrest is, however, relatively rigid and cannot, particularly in the lordosis area, adapt optimally. Nor does the head pressure slightly forward correspond to a relaxed position for a person reclining backwards.

WO 2007/073836 describes a backup with a curved lordosis support. The curvature of the lordosis support is adjustable and can be adapted to the shape of the back. This is achieved while the backrest 25 is flexible in the lordosis zone and in the lower shoulder area; and by fixing the pelvis area at different heights the curvature of the lordosis zone is changed. Once the curvature in the lordosis zone is established, it does not change until the new adjustment. This backrest does not automatically adjust to a change in the person's posture, for example when sitting straight and reclining.

The backing is also known in US 2004/012 4679 A1. 30

The objective of the invention is to initially identify the so-called folding backrest, which adapts to sitting automatically and optimally on the back, regardless of whether the person is sitting in an upright or reclining position. In this, lordosis should always be optimally supported.

According to the invention, the objective of a collapsible backrest in the manner initially mentioned is fulfilled, if the rotary landing on the back of the backrest is held just below the shoulder area and joins the backrest with the upper zone 35 of the backrest frame, in which the upper side of the backrest in relation to the backrest frame is foldable forward or backward.

The sliding link is fixed on the rear face of the backrest in the pelvis zone, in which the pelvis area of the backrest can slide vertically freely up or down in relation to the backrest frame.

According to the invention, the placement of a rotating landing, sliding link and increased flexibility of the lordosis zone leads to a coupling of the backrest movements in the shoulder area, in the lordosis area and in the pelvis area. The invention allows in any sitting position, an optimal adjustment of the backrest automatically to the person. Depending, where the person practices pressure on the backrest, the backrest is deformed correspondingly, so that the lordosis is always well supported.

In an unloaded state, the backrest in the lordosis area may be preformed in such a way that it is bent at an angle between 25 and 30 degrees and thus curved in the lordosis area.

According to the invention, by means of the placement of a rotary landing, a flexible lordosis zone and a sliding link, it happens that the backrest when a person feels adapts to the back of the person due to the pressure on the lordosis area. Thus, in relation to the unloaded state, the lordosis zone can be lowered with respect to the backrest frame from 10 to 20 degrees and move backwards, the upper area of the backrest above 50 rotating landing moves forward, and the pelvis area of the backrest move down along the sliding link.

It is further, according to the invention, that the backrest, when the person reclines back by the pressure in the shoulder area, also adapts to the back. Thus, in relation to the unloaded state and with respect to the backrest frame, the lordosis zone is additionally bent 10 to 20 degrees and thus exceeds the lordosis support, the upper area of the backrest above the rotary landing moves backwards, and the pelvis area of the backrest slides up along the sliding link. 5

The backrest, according to the invention, is adapted at the moment a person sits on the corresponding back and when reclining backwards guarantees an optimal sitting function in the lordosis and shoulder area.

In a preferred embodiment, the backrest comprises a filler support and a filler, in which the filler support has two lateral crossbars connected by several wedge-shaped ribs and in which the lateral crossbars, for example by narrowing, they are more flexible in the lordosis zone than in the 10 upper and lower zones.

Respectively, a rotary landing and a sliding link can be mounted behind on the side crossbars as link elements for the back frame with the filler support.

The backrest frame can have two diagonal cross braces, which connect the upper and lower link elements between them, in which the braces are connected to each other at their crossing point. fifteen

In another embodiment, the backrest can, in addition, present a support never, in which it can present an "S" shape adapted to the shoulders and neck of the neck and shoulder. The movement of the neck support behaves, when sitting and leaning back, in the same way as the shoulder area and garnatiza so that the head is also optimally supported.

BRIEF DESCRIPTION OF THE FIGURES 20

The invention will be explained in detail through an exemplary embodiment in context with the drawing. It shows:

Fig. 1 a side view of the office chair with a backrest according to the invention;

Fig. 2 a side view of the backrest with backrest frame and backrest support in an unloaded state (2a), when sitting (2b) and when reclining backwards (2c);

Fig. 3 a perspective view of the backrest padding support with backrest frame, backrest support and without padding;

Fig. 4 a back view of the office chair of Figure 1;

Fig. 5 the filler support with backrest frame and backrest support of Figure 3 in a sectional view through a side crossbar.

EMBODIMENTS OF THE INVENTION 30

Figure 1 shows a side view of an office chair with a folding backrest according to the invention. The office chair has a seat 1, which is coupled to a synchronized mechanism 2. A back support 3 is also attached to the synchronized mechanism, which again holds a rigid backrest frame 30. The backrest 10 is connected to the frame of backrest 30. The backrest 10 and the backrest frame 30 are foldable beyond the synchronized mechanism 2. The backrest 10 encompasses a never support 11, a shoulder area 12, a lordosis zone 35 13 and a pelvis area 14, and is connected with the backrest 30 above the upper and lower link elements 20 and 25. The neck support 11 and the shoulder area 12 are "S" shaped and adapted to the never and shoulder.

The upper link element 20 is a rotating landing, which according to the invention is mounted, just below the shoulder area 12, to the backrest. The upper area of the backrest 10, of the neck support 11 up to above the lordosis zone 40, acts as a lever and can be rotated through the center of rotation of the rotary landing, so that the shoulder area 12 with the neck support 11 can be folded forward or backward in relation to the backrest frame 30. The lower link element 25 is a sliding link, which is mounted in the pelvis area 12 of the backrest 10. In this sliding link 25 the area can be moved bottom of the backrest freely up or down in relation to the backrest frame 30. Increases the flexibility of the backrest in the lordosis area, so that the lordosis zone 13 is curved by cimbreo of the backrest 10 and in relation to the frame of Backrest 30 is movable forward and backward.

Figure 2 shows a backrest 10 with a backrest frame 30 and a backrest support 3 in three different states: in an unloaded state (Figure 2a), in a state when a person sits or in an upright position (Figure 2b) and in a state when a person leans back (Figure 2c). The illustrated movements 50 S1, S2, S3, S4, D1, D2 must be understood in relation to an unloaded state and in relation to the backrest frame 30. The different inclinations of the backrest 30 in relation to the seat 1 and the synchronized mechanism 2 of

The office chair are not shown. The backrest 10 is preformed so that, in an unloaded state (Figure 2a), it is curved in the lordosis zone.

The moment a person sits (Figure 2b), an F1 force arises that acts in the lordosis zone 13. The lordosis zone 13 is then flattened and pressed back (S1). The flattening is possible due to the increased flexibility of the backrest 10 in the lordosis zone 13. Thus, the backrest 10 is extended in its total length 5. Since the upper area of the backrest 10 is fixed in a vertical position by the rotary landing 20, the pelvis area 14 of the backrest 10 slides along the sliding link 25 downward (S2). At the same time the backrest zone 10 acts, between the lordosis zone 13 and the rotary rest 20, as a lever for the shoulder area 12 and the neck support 11. By the backward movement (S1) of the lordosis zone 13 the shoulder area 12 is overturned and the neck support 11 by the lever effect on the forward light rotating rotary 20 (D1). The backrest 10 adapts in this way automatically to the person's back at the time of sitting.

When the person leans back (Figure 2c), a force F2 is exerted on the shoulder area 12, and the shoulder area 12 and the neck support 11 turn slightly backwards (D2). The lever effect on the rotary landing 20 causes a curvature of the flexible lordosis zone 13 and moves it forward (S3). At the same time the backrest 10 is shortened and the pelvis area 14 of the backrest 10 slides along the sliding link 25 upwards (S4). Also, when a person leans back, the backrest adapts to changing conditions and the shape of the back. The lordosis, which when resting reclines more or less, is always optimally supported by the curvature of the backrest. The movement of the neck support 11 behaves, at the moment a person sits and when reclining, in the same way as the shoulder area 12 and thus guarantees that the neck and head of the person are also optimally supported 20 .

The combination according to the invention of rotary landing 20, sliding link 25 and increasing the flexibility of the lordosis zone 13 allows in each sitting position an optimum, automatically, adaptation of the backrest 10 to the person's back.

Figure 3 shows a preferred embodiment of the padding support 40 of the backrest 10, with the backrest frame 30 and the backing support 3 in a perspective view. The padding 47 is not shown in Figure 3. The padding holder 40 has two side crossbars 41, which are connected by several wedge-shaped ribs 42. In the lordosis area 13 are the side crossbars 41 narrowed 43, so which have an increased flexibility compared to the other lateral crossbar areas. In the lordosis zone 13, a lordosis support 45 is mounted, if applicable, sliding. Respectively, a rotary landing 20 and a sliding link 25 are mounted behind on two lateral crossbars 41. The rotating landing 20 is located just below the shoulder area 12 of the backrest 10. Both rotating rests 20 and both sliding links 25 are connected by above the backrest frame 30. The backrest frame 30 is parked balancedly above the backrest support 3 to the synchronized mechanism 2, as shown in Figures 1 and 4.

Figure 4 shows a back view of an office chair with, according to the invention, a folding seat 10 with a backrest frame 35, which is balancedly attached above the backrest support 3 to the synchronized mechanism 2. The backrest frame 30 has two diagonal cross braces 31, where the braces 31 are connected to each other at their crossing point 32. A crossbar 33 connects the lower ends of both braces 31.

Figure 5 shows a padding support 40 with a backrest frame 30 and a backing support 3 in a sectional view through a side cross member 41. The backing support 3 and the braces 31 of the backing frame 30 40 are represented in the same cutting plane. Likewise, the filler 47 is shown. The sliding link 25 comprises a bearing support 26, which at its front end forms a T. The bearing support 26 is fastened in the form of a closure between the back support 3 and the frame of backrest 30. The crossbar of the T-shaped end of the bearing support 26 is guided towards a cavity 27 of the side cross member 41 of the filling support 40, which is covered by a bearing cover. The bearing cover has a vertical cut for the displacement, and at the upper end, for the assembly, a horizontally oriented window for the assembly of the crossbar of the bearing support 26. Through this type of storage it is allowed to move freely the lower end of the backrest support 40 in the vertical direction, whereby it is possible to compensate for the length alteration resulting from the deformation of the filling support 40.

In the described embodiments, the neck support can also be omitted. It is not essential for the described function 50 of the backrest, since the pressure when reclining backwards (F2 in Figure 2c) is exerted in the shoulder area 12 of the backrest 10. If a neck support 11 is available, it can also pressure F2 is exerted by means of the neck and / or the head, which increases the already described lever effect on the rotary landing 20.

LIST OF NAMES

1 seat

2 synchronized mechanism

3 back support

4 backup

1 supports neck 5

12 shoulder area

13 lordosis zone

14 pelvis area

20 rotary landing

25 sliding link 10

26 bearing support

27 cavity

30 rigid backrest frame

31 braces

32 crossing point 15

33 crossbar

40 filler stand

41 side crossbar

42 wedge-shaped ribs

43 narrowing 20

45 lordosis support

47 padding

Claims (8)

1. Folding backrest, in particular for an office seat, with a shoulder area (12), a lordosis area (13) and a pelvis area (14), in which the backrest (10) is flexible so less in an area and is connected to a rigid backrest frame (30) at least in an upper and lower link element (20, 25), in which the upper link element is made in the form of a rotating landing ( 20) and fixed on the back side of the backrest (10) just below the shoulder area (12), in which the upper side of the backrest (10) is foldable forward or backward in relation to the backrest frame ( 30), in which the lower link element is made in the form of a sliding link (25) and fixed on the rear face of the backrest (10) in the pelvis area (14), in which the pelvis area ( 14) of the backrest (10) can slide vertically freely up or down relative to the backrest frame (30), and in which the backrest flexibility (10) is increased in the lordosis zone (13), so that the lordosis zone (13) is torsionally curved, characterized in that the backrest (10) is preformed to be folded at an angle between 20 and 30 degrees in the lordosis zone (13) in the unloaded state and the lordosis zone (13) and thus be curved, because the backrest (10) at the time a person feels adapts to the back of this person by pressure on the lordosis zone (13) and thus, in relation to the unloaded state, the lordosis zone (13) moves backwards and collapses from 10 to 20 degrees, with respect to the backrest frame, the upper area of the backrest (10) above the rotary landing (20) is moved forward 15, and the pelvis area (14) of the backrest (10) slides down along the sliding link (25), and by that the backrest (10), when a person sitting in the seat leans back, is deformed by pressure on the area of the shoulder (12) of the backrest (10) and thus, in relation to the unloaded state and with respect to the backrest frame (30), it is folded in the lordosis zone approximately 10 to 20 additional degrees and thus exceeds beyond the area of lordosis (13), that the upper area of the backrest (10) above the rotating rest (20) moves backward, and that the pelvis area (14) of the backrest (10) thus slides upwards along of the sliding link (25). 2. Folding backrest according to claim 1, characterized in that the backrest (10) comprises a filler support (40) and a filler (47), wherein the filler support (40) has two lateral crossbars (41) connected by several wedge-shaped ribs (42), in which the lateral crossbars (41) are more flexible in the lordosis zone 25 (13) than in the upper and lower zones. 3. Folding backrest according to claim 2, characterized in that, in the lordosis zone (13), the increased flexibility of the lateral crossbars (41) is obtained by a reduction of the lateral crossbars (41). 4. Folding backrest according to any one of claims 2 or 3, characterized in that the backrest frame (30) is connected to the padding support (40) by two rotating rests (20) mounted behind on the 30 side crossbars (41) . 5. Folding backrest according to any one of claims 2 to 4, characterized in that the backrest frame (30) is connected to the filler support (40) by two sliding links (25) mounted behind on the side crossbars (41). 6. Folding backrest according to any one of claims 2 to 5, characterized in that the backrest frame (30) comprises two diagonal cross braces (31), which connect the upper and lower link elements between them, in which the braces (31) are connected to each other at their crossing point (32). 7. Folding backrest according to any one of claims 1 to 6, characterized in that the backrest (10) has a neck support. 8. Folding backrest according to claim 7, characterized in that the backrest (10) has in the area of 40 shoulder (12) and the neck support (11) an "S" shape adapted to the shoulders and neck.