DE102018128486A1 - chair - Google Patents

Abstract

The invention relates to a chair comprising a backrest (1) with a lumbar support (2). According to the invention, it is provided that the lordosis support (2) is at least partially optionally made of an auxetic material or has an auxetic structure.

Description

The invention relates to a chair according to the preamble of claim 1.

A chair of the type mentioned above is generally known (see for example https://de.wikipedia.org/w/index.php?title=Lordosenst%C3%BCtze&oldid=160125960), so that no special printed evidence is required in this regard.

The invention has for its object to improve a chair of the type mentioned.

This object is achieved with a chair of the type mentioned by the features listed in the characterizing part of patent claim 1.

According to the invention, it is therefore provided that the lordosis support is at least partially optionally made of an auxetic material or has an auxetic structure, which is described in more detail below.

In other words, the solution according to the invention is thus optionally characterized by the use of a special material having an unusual property or a special structure. This or this expands because of its or its negative Poisson number (also called transverse contraction number) when stretching transversely to the direction of stretching (see also https://de.wikipedia.org/w/index.php?title=Auxetisches_Material&oldid=172941519 ), which can be used particularly inexpensively in the case of a lumbar support that is usually subjected to tension, since it should support the back of a user when the user is leaning against the support. In the solution according to the invention, a load on the material or structure leads to the fact that the material or structure thickens and can therefore be used particularly well to support the back of the user.

Other advantageous developments result from the dependent claims.

• Aus dem Dokument US 2015/0320220 A1 ist ein Stuhl bekannt, bei dem die Rückenlehne, die selbst keine Lordosestütze aufweist, eine auxetische Struktur aufweist.

For the sake of completeness, reference is made to the following two further documents:

• From the document US 2015/0320220 A1 A chair is known in which the backrest, which itself has no lumbar support, has an auxetic structure.

From the document DE 10 2016 201 556 A1 is known a seat belt for a vehicle in which the fabric of the belt consists of an auxetic material.

The chair according to the invention, including its advantageous developments according to the dependent claims, is explained in more detail below with reference to the drawing of a preferred exemplary embodiment.

• 1 perspektivisch den Stuhl mit der erfindungsgemäßen Lordosestütze;
• 2 perspektivisch die Lordosestütze einerseits unbelastet und „dünn“ (links) und andererseits belastet und „dick“;
• 3 schematisch ein unbelastetes, auxetisches Material bzw. eine unbelastete, auxetische Struktur; und
• 4 schematisch das Material bzw. die Struktur gemäß 4 in belasteter Stellung.

It shows

• 1 perspective the chair with the lordosis support according to the invention;
• 2 perspective the lumbar support on the one hand unloaded and "thin" (left) and on the other hand loaded and "thick";
• 3 schematically an unloaded, auxetic material or an unloaded, auxetic structure; and
• 4 schematically the material or structure according to 4 in a loaded position.

The in 1 shown chair consists in a known manner of a backrest 1 with a lumbar support 2 , The backrest is also with a seat 3 connected, which in turn is on one foot 4 is attached.

It is essential for the chair according to the invention, specifically for all possible embodiments, that the lordosis support 2 , which is preferably designed like a pillow-like cushion, is at least partially optionally made of an auxetic material or has an auxetic structure.

If an auxetic material is used, it is preferably provided that a thermoplastic polyurethane (PTU) is used as the auxetic material, the core property of which, as already stated, is to have a negative Poisson number. It is particularly preferably further provided that the auxetic material is foam-like.

If an auxetic structure is used, reference is made to the 3 and 4 preferably provided that the auxetic structure from a plurality of mutually movable plate elements 2.5 is formed. In addition, it is preferably provided that those plate elements 2.5 with every load on the lumbar support 2 are arranged parallel to each other, also parallel to a back contact surface 2.1 are arranged progressively.

Furthermore, the presetting or the presetting of a prestress on the lumbar support 2 particularly preferred on the backrest 1 an actuating device is provided (not shown separately).

As already mentioned above, the lumbar support shows 2 a backrest surface 2.1 for one Users of the chair on. Here is (especially with reference to 2 ) particularly preferably provided that the lordosis support 2 in a direction perpendicular to the back contact surface 2.1 has a thickness which, when loaded by a user of the chair ( 2 , right) larger than with an unloaded back contact surface 2.1 ( 2 , left) is formed.

Also with reference to 2 it is preferably provided that the lordosis support 2 when using the chair in the vertical direction has a constant height even under load.

In addition, again, with reference to 2 , particularly preferably provided that the lordosis support 2 when using the chair is designed to be stretchable in the horizontal direction under load.

How out 1 it can also be seen that the backrest is preferably provided in a manner known per se 1 optionally a support structure 2.2 and / or padding 2.3 having. In this case, the lordosis support is also particularly preferably provided 2 optionally on the support structure 2.2 and / or on the upholstery 2.3 is fastened.

Finally, it is also particularly preferred in this case that the lordosis support 2 one point of attack on each side 2.4 for their attachment to the support structure 2.2 or on the upholstery 2.3 having.

LIST OF REFERENCE NUMBERS

1

backrest

2

lumbar support

2.1

Back contact surface

2.2

support structure

2.3

upholstery

2.4

attackpoint

2.5

panel member

3

seat

4

foot

QUOTES INCLUDE IN THE DESCRIPTION

This list of documents listed by the applicant has been generated automatically and is only included 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.

Patent literature cited

• US 2015/0320220 A1 [0008]
• DE 102016201556 A1 [0009]

Claims (10)

Chair comprising a backrest (1) with a lordosis support (2), characterized in that the lordosis support (2) is at least partially optionally made of an auxetic material or has an auxetic structure. Chair after Claim 1 , characterized in that an adjusting device is provided on the backrest (1) for specifying a prestress on the lordosis support (2). Chair after Claim 1 or 2 , wherein the lordosis support (2) has a back abutment surface (2.1) for a user of the chair, characterized in that the lordosis support (2) has a thickness in a direction perpendicular to the back abutment surface (2.1) which is greater when loaded by a user of the chair than with an unloaded back contact surface (2.1). Chair after one of the Claims 1 to 3 , characterized in that the lumbar support (2) has a constant height when the chair is used in the vertical direction, even under load. Chair after one of the Claims 1 to 4 , characterized in that the lordosis support (2) is designed to be stretchable in the horizontal direction when the chair is in use. Chair after one of the Claims 1 to 5 , The backrest (1) optionally having a support structure (2.2) and / or an upholstery (2.3), characterized in that the lordosis support (2) is optionally attached to the support structure (2.2) and / or to the upholstery (2.3) is. Chair after Claim 6 , characterized in that the lordosis support (2) has a point of attack (2.4) on both sides for fastening it to the support structure (2.2) or to the upholstery (2.3). Chair after one of the Claims 1 to 7 , characterized in that the lordosis support (2) is designed like a pillow-like cushion. Chair after one of the Claims 1 to 8th , characterized in that the auxetic structure is formed from a plurality of plate elements (2.5) which are movable relative to one another. Chair after Claim 9 , The lumbar support (2) having a back contact surface (2.1) for a user of the chair, characterized in that those plate elements (2.5) which are arranged parallel to each other when the lordosis support (2) is loaded are also parallel to the back contact surface (2.1 ) are arranged progressively.

Images