EP2502520B1 - Chair with pelvic support and horizontally adjustable seating surface - Google Patents

Abstract

The work chair comprises a frame (14) having a seat plate (8) on which a cushion support (11) is provided with cushion pad (6). The cushion support is locked or displaced relative to the seat plate in horizontal or longitudinal direction (F). The cushion pad is comprised of a pelvic support (7) for a user (1). The pelvic support is connected to the seat plate of the frame. The material of the pelvic support is wood, metal and/or plastic.

Description

The invention relates to a chair, in particular work chair, with pelvic support and horizontally displaceable seat according to the preamble of independent claim. 1

Such a chair is for example with the DE 202006009828 U1 known. There is a work chair with Schiebesitzarretierung with longitudinally displaceable and lockable cushion support and pad thereupon, and disclosed with a seat plate, wherein a pivot plate is hinged to the seat plate via a pivot joint, which is pivotable about pivoting about the seat plate continuously around the pivot around, and the longitudinally displaceable cushion support is arranged on the pivot plate and there is a repeatedly releasable positive and / or non-positive locking of the sliding seat lock between the pivot plate and the cushion support.

Thus, pivotable about a horizontal axis and longitudinally displaceable in a horizontal plane seats on a seat plate are known.

Furthermore, pelvic supports are generally by the DE 1256840 A1 become known, which discloses a gymnastics device, with a seat with a wedge-like in the immediate region of the seatbone bumps of the sitting person backwards rising support element with adjustable by hand raising angle.

The upright posture without hunchback is important for a seated person to avoid damage especially to the intervertebral discs. The position of the human pelvis when sitting is crucial for good posture without hunchback. At the bottom of the pelvis are the ischial tuberosities (right and left), which lie on the seat foam. As soon as the human pelvis tilts backward as a fulcrum with the ischial tuberosities, the human will take a rounded back when sitting. Therefore, this tilting of the pelvis should be avoided.

The seat of a chair is intended to support this upright posture by helping to avoid tilting the pelvis. In order to achieve the supporting effect, it is necessary that a seat be formed so that it supports the underside of the pelvis behind the seatbone bumps when the seated user sinks. This is usually done by the formation of the seat foam with a trough.

The adaptability to the different body dimensions of the different users (large, small, ....) also requires an adjustment of the seat depth, so as to support through the seat, the different lengths thighs along the entire length. This adjustment is usually achieved by a displacement of the seat in the horizontal longitudinal direction.

On the one hand, as mentioned above, a good shape of the seat required (support the pelvis) and on the other hand, a displacement of the seat in the horizontal longitudinal direction (support for the thighs). The seated person supports himself with his back on the back in the area of the iliac crest. The backrest is usually stationary in the horizontal direction and thus the seated person is fixed in a horizontal direction. Thus, a molded seat foam, which allows by its displacement in the horizontal longitudinal direction to adapt to the leg length of the user, be optimally formed only in a single position to the buttocks of the sitter and exert the optimum support effect on the pelvis only in this single position. In all other positions, the shape of the seat thereby has a negative effect on the pleasant sitting, since the seated person sits on the foam edge behind or in front of the seat recess. Therefore, in seats that can be moved, often dispensed with the shape of the seat foam. As a result, however, the important support described above is lost to the pelvis.

With the WO 01170072 A1 discloses a work chair with frame, which has a seat plate on which a padded cushion support is located, which is displaceable relative to the seat plate in horizontal or longitudinal displacement directions and possibly. Locked. The cushion has a pelvic support for the user, the pelvic support being fixedly connected to the seat plate of the frame.

The object of the invention is to exercise a supportive effect on the upright posture of a seated person in a simple and cost effective manner. In sedentary people, the position of the pelvis is crucial. The pelvis determines the curvature of the spine. This is ideally double S-shaped. In this shape of the spine, the discs are the least loaded and the ligaments, the discs on the front and Fix the back of the vertebrae are neither overstretched nor compressed. This double S-shaped shape of the spine must therefore be effected while sitting. Since a seated and working person but not focus on his sitting and thus can also correct his posture again and again, so that he sits optimally, it is the task of the chair to effect this anatomically correct posture without deliberate will process of the sitter. The position of the pelvis is decisive for this. This must be erected. So that it stays in this position and does not tilt backward, which would be energetically more favorable, two supporting functions are important in the first place. This is the contact of the back of the user on the back in the area of the iliac crest or in the lordosis and a corresponding shape of the seat so that an increased pressure on the underside of the pelvis (sacrum) behind the ischial tuberosms prevents the pelvis from tipping backwards. For chairs without a seat depth adjustment, this shape can be easily achieved by the geometry of the seat shell and the seat foam (seat recess). In chairs with a seat depth adjustment, only this shaping can be carried out in the same way, if the seat depth adjustment takes place, for example by a seat extension in the front region of the seat. This is done in some chair manufacturers (eg patent EP 0 970 637 A1 or DE 10 2007 047 028 B3 ). However, this is quite a complicated task.

Object of the present invention is therefore to provide a generic chair, especially work chair, with pelvic support and horizontally movable seat so that the pelvic support optimally supporting in each longitudinally displaced use position of the seat on the pelvis of a seated on the seat of the user and user so that the chair is better adaptable to different sized users.

To achieve the object serve the features of independent claim 1, wherein advantageous developments are the subject of the dependent claims.

It is essential that the pelvic support with the frame of the chair and in particular with the seat plate or other stationary component of the frame firmly connected or firmly connected, so in the sliding direction of the seat fixed to the back of the user.

The advantage is that regardless of the relative position of the longitudinally adjustable seat, the pelvic support maintains its pelvic support independent of the size of the user.

The pelvic support according to the invention has the same effect as a fixed non-adjustable seat or a seat of the front is extended with much less effort. Thus, two advantages are achieved, the important support of the upright pelvis despite a seat depth adjustable seat and second, a simple and very cost effective solution.

It is important that the pelvic support is attached to a component that participates in the same movement when leaning and pushing through the back, but not the sliding movement of the seat or seat foam. Although the seatbelt mechanism is independent of the seat depth adjustment (sliding seat), but does not make the seat movement when leaning against the backrest. The backrest bar makes the movement of the back, but in a different relationship than the seat. The synchronous mechanism has a back / seat movement ratio between 3/1 and 4/1. The backrest makes so much more way. Thus, the suspension of the pelvic support and thus the fixation can be only on a component that exactly participates in the pivotal movement of the seat, but which does not move when moving longitudinally. Absolutely important and imperative for the invention is that the pelvic support always remains to the buttocks of the sitter in the same place. As the user leans against the back, which is fixed in longitudinal displacement directions, his ischial tubercles always come to rest on the same position on the seat, whether he pushes the seat further forward or backward. The pelvic support then has to keep this distance to the backrest constant. The backrest is in turn attached to the seat support mechanism, the seat plate also, the pelvic support back to the seat plate and thus fixed in Längsverschieberungen, but can join the pivotal movement of the seat.

According to the invention, the pelvic support is adjustable and lockable in the longitudinal displacement direction.

Due to the fact that the pelvic support can also be adjusted and locked in longitudinal displacement directions, a fine adjustment to the different sized users can take place. In reality, it is the case that on the one hand the user does not sit directly on the pelvic support but has a foam in between, which compensates smaller differences in the distance of the back of the user to the ischial tuberosities and on the other hand this difference in the distance of small and tall people is not very great , Actually, it is the difference of the pelvic depth that is the distance from the sacrum to the ischial tuberosities. The difference between small and large people at this distance is about 2 - 3 cm. In a fixed pelvic support according to the basic idea of the present invention, such an average will be correct, that is, the little person will sit a little closer to the pelvic support and have a slightly higher pressure behind the ischial tuberosities, the big person will sit a little further away and one have slightly lower pressure. A disadvantage of an adjustable and lockable in longitudinal displacement pelvic support is the risk of misalignment and thus either the ineffectiveness, because the distance is set too large or an unpleasant pressure when the distance is too close. An advantage would certainly be an adaptation to the different body sizes and the associated different distances of the sacrum and ischial tuberosity and thus an adaptation to the individual needs of the user. Thus, one can say that a further development may well be a pelvic support that can be adjusted and locked in longitudinal displacement directions, but does not necessarily have to be, since the difference between different large users is relatively small, as shown above with 2-3 cm.

The foam formation of the pad on the poster carrier is important, but less so for the basic principle of the pelvic support. Depending on the shape of more or less foam is displaced by the pelvic support. It is envisaged that the foam in the sliding area of the pelvic support is free and has only a ribbing in the foam, so that the foam does not have to be displaced over the entire surface but only partially in the respective rib area. The height of the ribs then determines the pressure on the pelvic support and thus the displacement when moving. The user is supposed to form the seat foam in the area of the buttocks himself through his body. Where there is less foam through the pelvic support (behind the point 5) and thus less displacement, the pressure on the buttocks (actually on the area of the sacrum) will be greater, for example in the area in front of the pelvic support, because there more foam thickness and Foam volume is. This greater pressure on the sacrum is to prevent tilting of the pelvis to the rear, so that the sitter does not fall into a rounded back, which inevitably happens when the pelvis tilts backwards. It is important to build up so much pressure that both a supporting effect on the pelvis is possible as well as to allow so much softness and deformation that this support and the higher pressure is not perceived as unpleasant. The pressure in turn is very much dependent on how the foam is in compressive strength and density (foam quality), so it can vary from foam to foam. The subjective feeling of the user also varies, which can be very different despite the same or similar body proportions (from sporty hard to down soft). It is more or less displaced foam, but the degree of displacement is not essential for the functioning of the pelvic support, but for their effect. Thus, the area 18 in the seat foam 6, depending on the foam quality with or without ribs or hollow or filled. The more foam in this area and the harder the seat foam, the greater the support effect on the user.

In the following the invention will be explained in more detail by means of drawings showing an embodiment. Here are from the drawings and their description further features essential to the invention and advantages of the invention.

• Figur 1: Den erfindungsgemäßen Stuhl mit der in Richtung Rückenlehne längs verschobenen Sitz für einen relativ kleinen Nutzer;
• Figur 2: Den erfindungsgemäßen Stuhl mit der von Rückenlehne weg längs verschobenen Sitz für einen relativ großen Nutzer;
• Figur 3: Draufsicht auf Figur 2 ohne Darstellung des Nutzers.

It shows:

• FIG. 1 : The chair according to the invention with the seat back longitudinally shifted seat for a relatively small user;
• FIG. 2 : The chair according to the invention with the backrest longitudinally shifted seat for a relatively large user;
• FIG. 3 : Top view on FIG. 2 without representation of the user.

The chair according to the invention comprises a frame 14 which is fastened via a sleeve 13 to a pedestal (e.g., base with rollers), which is not shown in detail, so that the frame 14 is rotatable about the vertical axis of the pedestal.

The frame 14 consists of an L-shaped backrest bar 4 and a so that e.g. Seat support mechanism 10 connected via a pivot joint 15, with a seat plate 8, which is arranged between backrest bracket 4 and seat support mechanism 10 on its upper side, e.g. is attached via pivot joints 16, 17.

The seat support mechanism 10 is connected via the sleeve 13 to the pedestal.

On seat plate 8 of the frame 14 is provided with a pad 6 padding support 11 which is relative to the frame 14 in horizontal or Längsverschierichtungenungen F displaceable and, if necessary. Lockable, wherein the pad 6 has a pelvic support 7 for the user 1.

It is important that now the pelvic support 7 is fixedly connected to the frame 14 and in particular with the seat plate. 8

Alternatively, however, the pelvic support 7 may be formed on the seat plate 8 in the horizontal or longitudinal displacement directions F adjustable and fixable.

FIG. 1 shows the seat assembly with a seat (6,11) in the rear position for a user (1) with short thighs. The thigh length dimension B is small according to the small user. The distance between the knees and the front edge of the seat, measure C, should be as constant as possible for all leg lengths (about one hand width).

FIG. 2 shows the seat assembly with a seat (6,11) in front position for a user (1) with long thighs. Dimension B 'is large, measure C is again about a hand's width, since the seat (6,11) is to be moved to the same extent as the Beillänge increases.

The pelvic support (7) causes a support of the pelvis independently of the displacement of the seat (6,11), so that even with a sliding seat, the molded support of the pelvis is possible. This is achieved in that the pelvic support (7) as well as the backrest (2,4) and the seated end (1) is stationary and does not shift in the direction F even with a displacement of the seat (6,11).

The distance measure A (distance contact point (3) user to the back to the ischial tuberosities contact point (5) user seat) is constant. The dimension E is variable and adaptable to the user depending on leg length.

Through a slot (12) in the seat shell (11) the pelvic support (7) is fixed with a hook (9) on the seat plate (8). Thus, the pelvic support (7) via the seat plate (8) is fixed to the backrest contact point (3), although the pelvic support (7) between the seat shell (11) and the seat foam (6) is thus within the seat unit (6,11). The backrest contact point (3) is also fixed to the seat plate (8) in the swivel joint (16) by the backrest (2, 4) and thus also to the user (1) and the pelvic support (7) because the user (1) himself with its back on the backrest foam (2) at the point (3) is supported. If the user shifts the seat shell (11) with the seat foam (6) in the direction F forwards or backwards, the pelvic support (7) still remains at the point which is optimal for supporting the pelvis (distance A).

When sitting, thus the user (1) by sitting the formation of the seat foam (6) cause itself, as the pelvic support (7) from below compression of the seat foam (6) behind the pelvis and thus reduces increased pressure on the pelvic underside causes the ischial tuberosities, which in turn prevents tilting of the pelvis to the rear and thus leaves the seated person (1) sitting upright and without hunchback. Because the pelvic support (7) is independent from the position of the seat is always in the correct (fixed) distance (D) to the buttocks of the seated person (1), also creates an uncomfortable sitting sensation by sitting on a foam edge, as in a molding of the seat foam associated with a seat depth adjustment by moving of the seat (6,11) in the direction F would be the case.

The dimensions A and D are constant and independent of the position of the seat (6,11). Thus, the support effect on the pelvis is independent of the position of the seat (6,11) and thus always at the right place at the contact point (5) behind the ischial tuberosities, as well as the user (1) on the stationary backrest (2, 4) always has the same fixed distance to the pelvic support (7).

Incidentally, the measure B has been based on the anthropometric measurement table according to DIN 33402 Part 2. Since the measure B is described as the buttock - knee length (seat depth). Of course it could also be the measure from point 5 to the back of the knee. Is irrelevant for the invention, since both distances depend on the body proportions.

If from the position FIG. 1 in the position FIG. 2 the seat is pushed forward, then 7 padding material 6 is displaced behind the pelvic support. If the seat from the position to FIG. 2 in the position FIG. 1 pushed back, then 7 padding material 6 is displaced before the pelvic support. The pad (6) is in the sliding area (18) of the horizontal or Längsverschieberungen (F) of the pelvic support (7) depending on the foam quality is not fully available, but may only have a partial volume ribbing, so that the foam is not displaced over the entire surface must be but only partially in each rib area. This area can also be completely without foam with a sufficiently hard seat foam.

In the side view of FIGS. 1 and 2 the pelvic support 7 is wedge-shaped in height, the underside planar surface, the back circular-shaped and the user-facing surface anatomically adapted to the buttocks of an average person, arc-shaped curved.

FIG. 3 discloses how the pelvic support 7 is designed in the width of the chair or seat, namely in the form of a circular ring sector over an angle α from here example about 35 °, but also deviating angle ranges α should be possible, especially larger angle ranges α, for example between 35 ° and 90 ° or even up to 180 °. However, it is sufficient for a suitable support of the pelvis of a user, an angle range α between about 30 ° and 40 °.

The seat support mechanism is irrelevant in its function for the pelvic support and in the drawings, only a scheme that would not work at all, because a compensating joint or sliding bearing is missing. It is only important that the attachment point of the backrest bar 4 and the seat plate 8 allow a nearly constant distance from each other. In a synchronous mechanism, the backrest will usually make a backward and downward movement and the seat will be in the same ratio as described in the general part of the description.

Figure Legend

1. 1st user
2. 2. backrest cushion
3. 3. Contact area iliac crest area of 1 with 2
4. 4. Backrest frame
5. 5. Contact area of the ischial tuberosity area from 1 to 6
6. 6. Seat pad
7. 7. Pelvic support
8. 8. Seat plate
9. 9. Hanging from 7 to 8
10. 10. Seat carrier mechanism
11. 11. Upholstery support
12. 12th slot for 9 in 11
13. 13. sleeve
14. 14. Frame (seat backrest unit)
15. 15. Swivel joint
16. 16. Swivel joint
17. 17. Swivel joint
18. 18. Area of foam compression by the user 1
19. A = horizontal distance sacrum of 1 - ischial tuberosity of 1
20. B = horizontal distance sacrum of 1 - popliteal fossa of 1; B '
21. C = horizontal distance front edge seat - back of knee from 1
22. D = horizontal distance posterior pelvic support - ischial tuberosity of 1
23. E = horizontal distance of the ischial tuberosity of 1 - front edge seat; e '
24. F = horizontal or longitudinal displacement of seat
25. α = angular range of the pelvic support 7 in width

Claims (8)

1. Work chair with frame (14), which has a seat plate (8), on which a cushion support (11) is located, which is provided with a cushion (6) and can be displaced relative to the seat plate (8) in the horizontal or longitudinal displacement directions (F) and optionally locked, the seat plate (8) with the cushion (6) having a separate pelvic support (7) for the user (1), characterised in that the pelvic support (7) can be displaced relative to the seat plate (8) of the frame (14) in the horizontal or longitudinal displacement directions (F) and is lockably connected.
2. Work chair according to claim 1, characterised in that the pelvic support (7) can be displaced relative to the frame (14) in the horizontal or longitudinal displacement directions (F) and can optionally be locked.
3. Work chair according to either of claims 1 or 2, characterised in that the cushion (6) is not present with a full volume in the sliding region (18) of the horizontal or longitudinal displacement directions (F) of the pelvic support (7), but only has a partial-volume ribbing.
4. Work chair according to any one of claims 1 to 3, characterised in that the material of the pelvic support (7) is wood, metal and/or plastics material.
5. Work chair according to any one of claims 1 to 4, characterised in that the cushion (6) and the pelvic support (7) contain a plastics material foam, the degree of hardness of the plastics material foam of the pelvic support (7) being in particular 2 to 10 times higher than the degree of hardness of the plastics material foam of the cushion (6), or completely hard.
6. Work chair according to any one of claims 1 to 5, characterised in that the pelvic support (7) with respect to the width of the chair or seat is in the form of a curved sector over an angle range (α) of between about 30° and 90°, in particular of about 35°.
7. Work chair according to any one of claims 1 to 6, characterised in that the pelvic support (7) is wedge-shaped with respect to height, the lower side being flat, the rear being circular ring-shaped and the face facing the user (1) being arcuately curved to be anatomically adapted to the buttocks of an average person
8. Work chair according to any one of claims 1 to 7, characterised in that the guidance between the seat plate (8) and cushion support (11) takes place by means of a sliding or rolling element guide and the sliding guide is configured, in particular as a round guide, C/U/L-shaped rail guide, T-groove guide or swallowtail guide.

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