DE102004050848B4 - Height-adjustable lumbar support - Google Patents

Abstract

The lordosis support has a height adjustable link and is integrated in the backrest. A relocatable pin (6), connected to the link, is accessible from the backside of backrest whereby pin penetrates in the link guide (5) provided with front and back spring. Pin is fixable form fit on the linking guide by means of fixing element elastically deformed by the springs in its size.

Description

TECHNICAL AREA

The The present invention relates to a lumbar support integrated in a backrest height-adjustable Lordosenbrücke, as used in particular for office chairs is and at which one from the back of the backrest more accessible and with the Lordosenbrücke connected sliding pin passes through a slotted guide in the backrest and along this backdrop force fit can be fixed. The Lordosenbrücke Here comes the task, a forward, more or agile pronounced bulge in the backrest to cause.

such lumbar supports are in different versions already known. In the case of the more elaborate, as before all come in car seats for use, the height adjustment takes place via a Gear or a cable or wire drawing system. About this adjustment takes place also a fixation of the chosen Height. Of the Advantage of these designs is mainly in their operability in sitting by a through the user with the hand still easily accessible place. Your disadvantage is In contrast, in the great technical effort with mostly many items.

at simpler embodiments the height adjustment takes place by moving the Lordosenbrücke usually on the side buttons, handles or levers. Although these designs have a relatively simple structure with few parts and are also easy to handle; the lordosis bridge becomes with them however mostly only by a surface friction on the respective set height. Under load, these brackets tend to slip, so that the user the Lordosenbrücke in their height must always readjust.

at all known solutions becomes a seat cushioning only over the mostly only very yielding used for the Lordosenbrücke Materials as well as over realized relatively thick upholstery in front of the Lordosenbrücke. If from design or space reasons e.g. a thin one back pad is required, press the Lordosenbrücken often uncomfortable in the back.

A built-in backrest lumbar support with height-adjustable lordosis bridge of the type mentioned is from the DE 24 51 745 A1 known. The sliding pin is formed here by a threaded shaft with a sweeping handle on the back of the backrest. The frictional fixation is done by tightening or screwing the threaded shaft in the Lordosenbrücke, whereby this is braced against the backrest.

At the time of the EP 1 082 037 B1 known lumbar support integrated with a backrest with height-adjustable Lordosenbrücke two parallel slotted guides are provided with lateral projections and recesses in a frame of the backrest, which are penetrated by connected to the Lordosenbrücke, pin-shaped engagement elements. The engagement elements have a size such that they can move freely within the sections with the greater width, but are statically immovable by frictional engagement within the sections with the smaller width. This embodiment corresponds in principle to the surface friction already mentioned, whereby the height adjustment also takes place by moving the lumbar bridge on laterally arranged buttons or handles.

PRESENTATION OF THE INVENTION

• – die Höhenverstellung einfach ausführbar ist,
• – eine einmal eingestellte Höhe ausreichend sicher gehalten wird, ohne dass hierzu eine zusätzliche Fixierung z.B. durch Festschrauben oder Betätigen eines besonderen Fixierungselements nötig ist, die zum Verstellen ja auch wieder gelöst werden müsste,
• – eine Ansitzdämpfung einfach realisierbar ist, und
• – der Herstellungs- und Montageaufwand durch möglichst wenige und einfache Teile und dadurch auch die Herstellungskosten möglichst klein sind.

The object of the invention is to provide a built-in backrest lumbar support with height-adjustable lordosis bridge of the type mentioned, in which

• - the height adjustment is easy to execute,
• - Once a set height is kept sufficiently secure, without the need for an additional fixation eg by tightening or pressing a special fixing element is needed, which would indeed be solved for adjusting so again,
• - An Ansitzdämpfung is easy to implement, and
• - The manufacturing and assembly costs by as few and simple parts and thereby also the production costs are as small as possible.

These Task according to the invention solved by the features specified in claim 1. The core of the invention is therefore that the slotted guide provided with projections and recesses is and that the sliding pin by means of a through the projections elastic deformed fixing at the height of the recesses positively fixed is.

The height adjustment is made simply by pushing up or down the lordosis bridge on the sliding pin. During the sliding operation, the fixing element is pushed over the slotted guide and thereby elastically deformed at the height of the projections. At the level of the recesses, it can expand in contrast. By this characteristic, the fixing element and with it the Lordosenbrücke at the level of the recesses each frictionally held, without the need for any further measures would be required. From the jump positions corresponding height positions, the lordosis bridge can be moved immediately again without the need for a lock or the like would have to be solved.

The frictional Fixation in the area of recesses should be be so dimensioned that a smooth shifting of the lordosis bridge is possible without it by the usual Seat pressure or by sliding movements occurring during use on the back pad to an unintentional adjustment of the Lordosenbrücke comes.

According to one preferred embodiment The invention is the slotted guide as a slot guide designed with lateral constrictions and extensions.

The Fuser can be over the sliding pin pushed ring element, preferably from a be elastically deformable plastic.

With Advantage is the slotted guide in one in a support structure the backrest usable guide flange is formed and is characterized e.g. as a molded part independent of the backrest Furthermore produced.

Of the guide flange is further preferred with a sliding guide for the Lordosenbrücke in shape of at least one leadership rib, Mistake.

The Lordosenbrücke can advantageously have a dimensionally stable base plate on which on the back the sliding pin and the front side a buckling element are attached. in this connection can then be provided that the base plate on the back with one to the mentioned displacement guide complementary Training in the form of at least one guide groove is provided.

According to one another preferred embodiment the invention with additional Ansitz damping to avoid an unpleasant pressure in the back includes the mentioned arching element the Lordosenbrücke a flexible, by edge-side brackets and a Lordosendämpfelement in a vaulted Position held, under load by Ansitzdruck flattening Lordosenmembran.

By the combination of lordosis membrane and Lordosendämpfelement let yourself realize a soft and well yielding support form, which their shape always remains visible under load apart from their curvature and visually always as well as thinner back padding offers a pleasing appearance. The lumbar support supporting the lumbar membrane bring these like a shock absorber always back to their original position.

In more usual Way, the inventive lumbar support covered on the front by a padding and e.g. in the backrest an office chair be integrated.

SHORT EXPLANATION THE FIGURES

The Invention is intended below with reference to embodiments in connection closer to the drawing explained become. Show it:

1 a lumbar support according to the invention in a vertical section along the central axis of a backrest;

2 one for the lumbar support of 1 suitable lordosis bridge; and

3 an exploded perspective view of the lumbar support of 1 ,

WAYS TO PERFORM THE INVENTION

In 1 designated 1 a back shell only partially shown the backrest, for example, an office chair. On its front, ie leaning side is the back shell 1 with a relatively thin padding 2 Mistake. The back shell forms part of the support structure of the backrest.

In an opening of the back shell 1 used is a lumbar support according to the invention with height-adjustable Lordosenbrücke. The lumbar support initially comprises a guide flange 4 placed in a corresponding recess in the back shell 1 used and is fixed in it, for example by screwing.

In the guide flange 4 is designed as a slot guide with lateral constrictions and extensions slotted guide 5 available. The constrictions form projections and the extensions recesses of the slotted guide.

A shift pin accessible from the back of the seat back 6 takes hold of the link guide 5 and is displaceable along the slotted guide.

The front end of the shift pin 6 is with the already mentioned lordosis bridge 7 verbun the. This is formed by a dimensionally stable base plate 8th , a lordosis membrane 9 and a lumbar cushioning element 10 , The latter consists for example of a soft, elastically deformable foam material.

The lordosis membrane 9 is approximately rectangular and is in the base plate 8th each along their two longitudinal edges held so that they are above the Lordosendämpfelement 10 has a curvature. By holding the lumbar membrane according to 2 However, at least along one of its longitudinal edges executed with play, the lumbar membrane 9 Flatten under the effect of a sitting pressure. The elastically compressed Lordosendämpfelement 10 bulges the lordosis membrane 9 after elimination of Ansitzdruckes again.

On its front is the guide flange 4 with guide ribs 11 provided, which with corresponding guide grooves 12 in the base plate 8th The Lordosenbrücke cooperate and lead the Lordosenbrücke in their shift.

A height fixation of the Lordosenbrücke 7 in a variety of positions along its through the gate or slot guide 5 defined displacement results from an elastically deformable fixing 13 in the form of an over the sliding pin 6 pushed and arranged in the slot guide ring element.

At the Moving this ring element at the height of the projections or Constrictions each elastically deformed. At height of the recesses or extensions can it in contrast expand. By this characteristic, the ring element and with him the Lordosenbrücke at height each of the returns force fit held.

With 14 is in 1 nor a cap called, by means of fastening screws 15 is fixed.

1

back shell

2

upholstery

4

guide flange 4

5

link guide

6

shifter pin

7

Lordosenbrücke

8th

baseplate

9

Lordosenmembrane

10

Lordosendämpfelement

11

guide ribs

12

guide

13

fixing

14

cap

15

mounting screws

Claims (10)

Lumbar support integrated in a backrest with height-adjustable lordosis bridge ( 7 ), in which a more accessible from the back of the backrest and with the Lordosenbrücke ( 7 ) associated shift pin ( 6 ) a slide guide ( 5 ) in the backrest and along this slotted guide ( 5 ) is non-positively fixed, characterized in that the slotted guide ( 5 ) is provided with projections and recesses and that the displacement pin ( 6 ) by means of a by the projections elastically deformed fixing element ( 13 ) is positively fixed at the level of the recesses. Lumbar support according to claim 1, characterized in that the sliding guide ( 5 ) is designed as a slot guide with lateral constrictions and extensions. Lumbar support according to one of claims 1 or 2, characterized in that the fixing element ( 13 ) is a pushed over the sliding pin ring element. Lumbar support according to one of claims 1-3, characterized in that the slotted guide ( 5 ) in a support structure ( 1 ) the backrest insertable guide flange ( 4 ) is trained. Lumbar support according to claim 4, characterized in that the guide flange ( 4 ) with a displacement guide for the Lordosenbrücke in the form of at least one guide rib ( 11 ) is provided. Lumbar support according to claim 5, characterized in that the lumbar bridge ( 7 ) a dimensionally stable base plate ( 8th ), on which the rear side of the sliding pin ( 6 ) and on the front side a curling element ( 9 ) are attached. Lumbar support according to claims 5 and 6, characterized in that the base plate ( 8th ) at the back with a to the sliding guide ( 11 ) complementary training in the form of at least one guide groove ( 12 ) is provided. Lumbar support according to claim 6 or 7, characterized in that the arching element ( 9 ) of the lordosis bridge ( 7 ) a flexible, by edge-side brackets and a Lordosendämpfelement ( 10 ) held in a curved position, under load by Ansitzdruck flattening lordosis ( 9 ). Lumbar support according to one of claims 1-8, characterized in that it is provided on the front by a padding ( 2 ) is covered. lumbar support integrated according to one of claims 1-9 in the backrest an office chair.