DE202011004160U1 - Chair with pelvic support and horizontal sliding seat - Google Patents

Abstract

Work chair with frame (14), which has a seat plate (8) on which a cushion (6) provided cushion support (11), which relative to the seat plate (8) in horizontal or longitudinal displacement directions (F) displaceable and, if necessary Lockable, wherein the pad (6) has a pelvic support (7) for the user (1), characterized in that the pelvic support (7) is connected to the frame (14).

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 20 2006 009 828 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 on 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.

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 intervertebral discs are the least loaded and the ligaments that fix the intervertebral discs to the front and 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 by the Geometry of the seat shell and the seat foam can be achieved (seat recess). For chairs with a seat depth adjustment can only be carried out in the same way, if the seat depth adjustment z. B. takes place by a seat extension in the front region of the seat. This is done with 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 is firmly connected to the frame of the chair and in particular with the seat plate or other stationary component of the frame 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.

In an alternative embodiment of 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 tall 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 would be 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 which can be adjusted and locked in longitudinal displacement directions, but need not necessarily be, since the difference between different large users as shown above with 2-3 cm is relatively low.

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 volume, the pressure on the buttocks (actually on the area of the sacrum) will be greater than z. B. in the area in front of the pelvic support, since there is more foam thickness and foam volume. 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 needs 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.

It shows:

1 : The chair according to the invention with the seat back longitudinally shifted seat for a relatively small user;

2 : The chair according to the invention with the backrest longitudinally shifted seat for a relatively large user;

3 : Top view on 2 without representation of the user.

The chair of the invention includes a frame 14 that has a sleeve 13 with on a not shown adjustable-height column of a pedestal (eg., Fußkreuz with rollers) is attached, so that the frame 14 to the pedestal in vertical axis is rotatable.

The frame 14 consists of an L-shaped backrest bar 4 and a z. B. via a swivel joint 15 Connected seat carrier mechanism 10 , with a seat plate 8th between the backrest bar 4 and seat carrier mechanics 10 on the top z. B. via swivel joints 16 . 17 is attached.

Here is the seat carrier mechanism 10 over the sleeve 13 connected to the pedestal.

On seat plate 8th of the frame 14 is one with upholstery 6 provided cushion support 11 which is relative to the frame 14 in horizontal or Längsverschieueberungen F displaced and, if necessary. Lockable, wherein the pad 6 a pelvic support 7 for the user 1 having.

It is important that now the pelvic support 7 with the frame 14 is stationarily connected, and in particular with the seat plate 8th ,

Alternatively, but also the pelvic support 7 on the seat plate 8th in the Horizontalbzw. Längsverschieberungen F be designed adjustable and fixable.

1 shows the seat assembly with a seat ( 6 . 11 ) in the back 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).

2 shows the seat assembly with a seat ( 6 . 11 ) in front position for a user ( 1 ) with long thighs. Dimension B 'is large, dimension C is again about a hand's width, since the seat ( 6 . 11 ) should be shifted to the same extent as the addition 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 by the pelvic support ( 7 ) as well as the backrest ( 2 . 4 ) and the sitter ( 1 ) is stationary and also in a shift of the seat ( 6 . 11 ) does not shift in direction F.

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 pan ( 11 ) the pelvic support ( 7 ) with a suspension ( 9 ) on the seat plate ( 8th ) fixed. This is the pelvic support ( 7 ) over the seat plate ( 8th ) fixed to the backrest contact point ( 3 ), although the pelvic support ( 7 ) between the seat pan ( 11 ) and the seat foam ( 6 ) within the seat unit ( 6 . 11 ) is located. The backrest contact point ( 3 ) is through the backrest ( 2 . 4 ) also on the seat plate ( 8th ) in the swivel joint ( 16 ) and thus also to the user ( 1 ) and the pelvic support ( 7 ) stationary, since the user ( 1 ) with his back to the backrest foam ( 2 ) at the point ( 3 ) is supported. Does the user move the seat pan ( 11 ) with the seat foam ( 6 ) in the direction F forwards or backwards, the pelvic support ( 7 ) always at the optimal position for supporting the pelvis (distance A).

When sitting, the user ( 1 ) by sitting the shape of the seat foam ( 6 ) cause the pelvic support ( 7 ) from below a compression of the seat foam ( 6 ) behind the pelvis and thus causes increased pressure on the underside of the pelvis behind the ischial tuberosities, which in turn prevents the pelvis tilting backwards and thus the sitter ( 1 ) can sit upright and without a round back. Because the pelvic support ( 7 ) regardless of the position of the seat always in the correct (fixed) distance (D) to the buttocks of the seated ( 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 the seat ( 6 . 11 ) in 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 in the right place at the contact point ( 5 ) behind the ischial tuberos, as well as the user ( 1 ) on the stationary backrest ( 2 . 4 ) always the same fixed distance to the pelvic support ( 7 ) having.

Incidentally, the measure B is in accordance with the anthropometric measure table DIN 33402 Part 2 oriented. Since the measure B is described as the buttock - knee length (seat depth). Of course it could also be the measure of point 5 to the popliteal fossa. Is irrelevant for the invention, since both distances depend on the body proportions.

If from the position 1 in the position 2 the seat is pushed forward, then behind the pelvic support 7 upholstery 6 repressed. If the seat from the position to 2 in the position 1 is pushed back, then in front of the pelvic support 7 upholstery 6 repressed. The upholstery ( 6 ) is in the sliding area ( 18 ) of the horizontal or longitudinal displacement corrections (F) of the pelvic support ( 7 ) is not fully available depending on the foam quality, but may only have a part-volume ribbing, so that the foam does not have to be displaced over the entire surface but only partially in the respective rib area. This area can also be completely without foam with a sufficiently hard seat foam.

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

3 revealed as the pelvic support 7 in the width of the chair or seat is designed, namely in the form of a circular ring sector over an angle α of here by way of example about 35 °, but also deviating angle ranges α should be possible, in particular larger angular ranges α z. B. between 35 ° and 90 ° or even 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 8th allow a nearly constant distance to 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.

LIST OF REFERENCE NUMBERS

1

user

2

backrest cushion

3

Contact area iliac crest area of 1 With 2

4

back frame

5

Contact area of the ischial tuberosity area of 1 With 6

6

seat cushion

7

pelvic support

8th

seat plate

9

Hanging from 7 at 8th

10

Seat support mechanism

11

cushion support

12

Slot for 9 in 11

13

shell

14

Frame (seat and back unit)

15

pivot

16

pivot

17

pivot

18

Area of foam compression by the user 1

A

Horizontal distance sacrum of 1 - ischial tuberosity of 1

B

Horizontal distance sacrum of 1 - popliteal fossa of 1 ; B '

C

Horizontal distance front edge seat - back of knee of 1

D

Horizontal distance posterior pelvic support - ischial tuberosity of 1

e

Horizontal distance of the ischial tuberosity of 1 - front edge seat; e '

F

Horizontal or longitudinal displacement of seat

α

Angular area of the pelvic support 7 in width

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 202006009828 U1 [0002]
• DE 1256840 A1 [0004]
• EP 0970637 A1 [0009]
• DE 102007047028 B3 [0009]

Cited non-patent literature

• DIN 33402 Part 2 [0038]

Claims (10)

Work chair with frame ( 14 ), which has a seat plate ( 8th ), on which a padded ( 6 ) provided padding support ( 11 ), which relative to the seat plate ( 8th ) in horizontal or Längsverschieichtung (F) displaceable and, if necessary. Lockable, wherein the pad ( 6 ) a pelvic support ( 7 ) for the user ( 1 ), characterized in that the pelvic support ( 7 ) with the frame ( 14 ) connected is. Work chair according to claim 1, characterized in that the pelvic support ( 7 ) relative to the frame ( 14 ) in horizontal or Längsverschieichtung (F) displaceable and if necessary. Locked. Work chair according to claim 1 or 2, characterized in that the pelvic support ( 7 ) with the seat plate ( 8th ) of the frame ( 14 ) connected is. Work chair according to claim 3, characterized in that the pelvic support ( 7 ) relative to the seat plate ( 8th ) of the frame ( 14 ) in Horizontalbzw. Längsverschieberungen (F) displaceable and, if necessary, can be locked. Work chair according to one of claims 1 to 4, characterized in that the pad ( 6 ) in the sliding area ( 18 ) of the horizontal or longitudinal displacement corrections (F) of the pelvic support ( 7 ) is not fully-voluminous, but has only a partial volume ribbing. Work chair according to one of claims 1 to 5, characterized in that the material of the pelvic support ( 7 ) Wood, metal and / or plastic is. Work chair according to one of claims 1 to 6, characterized in that the pad ( 6 ) and the pelvic support ( 7 ) contains a plastic foam, wherein the degree of hardness of the plastic foam of the pelvic support ( 7 ) is in particular 2 to 10 times higher or very hard than the degree of hardness of the plastic foam of the pad ( 6 ). Work chair according to one of claims 1 to 7, characterized in that the pelvic support ( 7 ) in the width of the chair or seat in the form of a curve sector over an angular range (α) between about 30 ° and 90 °, in particular of about 35 ° is configured. Work chair according to one of claims 1 to 8, characterized in that the pelvic support ( 7 ) wedge-shaped in height, the underside planar, the back circular and the user ( 1 ) facing surface anatomically adapted to the buttocks of an average person curved curved. Work chair according to one of claims 1 to 9, characterized in that the guide between the seat plate ( 8th ) and cushion support ( 11 ) is performed by a sliding or Wälzkörperführung and the sliding guide is designed in particular as a round guide, C / U / L-shaped rail guide, T-slot guide or dovetail guide.

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