DE2642091A1 - Office chair with adaptable backrest - has esp. disposed swivel axis ensuring automatic adjustment to all body movements - Google Patents

Abstract

The office chair has a back support (2) which can be inclined relative to the seat plate (1) with the swivel axis extending above the seat plate (1) and in front of the back support (2) to ensure that the back rest automatically follows the body movements. The articulated joints of the chair are formed by the ends (3, 4) of the arms of the seat plate and back rest and can be held firm by clamps or friction engagement. The swivel axis is preferably incoroeal and controlled by circular segments beneath the seat plate.

Description

Office chair.

Office chair with one that can be tilted back and forth in relation to the seat plate Backrest, characterized in that its pivot axis is above the seat plate and extends in front of the back support.

This invention was based on the following brochure information from other chair manufacturers from: 1.) The performance-enhancing, fatigue-free office chair is becoming more and more important from day to day. P9r Every workstation 2.) Based on the latest findings in ergonomics, the Prof. Dr. Etienne Grandjean from the Swiss Federal Institute of Technology in Zurich won in years of trials.

The backrest now also covers the whole of the swivel work chair Back up to the shoulder blades, across the entire width. Through this the intervertebral disc pressure is reduced and the back muscles when you lean back relaxed. The profile of the backrest optimally supports the back in every posture.

For the chair with an adjustable backrest, the pivot point became the Tilt mechanism arranged so that the movement curves of the backrest and the leaning back People run alike. The backrest always supports the back on the same one Job.

The patent literature has taken into account: AS 1654 388, OS 2000 172, AS 2026 929, AS 970 295.

The subject of the invention exaggerates all the good properties of these known chairs and avoids all their disadvantages.

This ensures, for example, that the backrest can support all movements willingly follows the working person and never lets the feeling arise in them. that between the human back and the back support relative movements of the To take place after.

The drawing represents AusftUirungsbeispiele schematically in side views. Figure 1 shows a chair with a swivel axis dominated by two mechanical joints and Fig 2 shows a chair with a swivel axis swung by two horns as organs of a stiff cradle frictionally braked without load. Pig 3 illustrates a chair upper part similar to that according to FIG. 1 with the difference that the two joints G are moved further backwards, while the web 3a is the core of an armrest. The upper part of the chair in FIG. 4 is similar to that in FIG.

The main parts of the two office chairs are the upholstered seat top 1 and the polished back support 2.

In the subject of FIG. 1, the joints resulting in the pivot axis are formed by ends 3, 4 of the arms of the seat plate and the backrest.

In the case of the chair in FIG. 2, the pivot axis (A) has no body.

It is made up of circular segments that are located below the seat plate controlled. The circular segments of the back support are sliding on roller bodies adjusting horns. The rolling elements are not illustrated. The feathers too or not rests that can assign 5 basic positions to the horns. Joints can be fixable by clamping or be clamped in a friction-locked manner.

The lower edge R of the backrest is approximately on both at the height of the swivel axis A.

Also shown in FIG. 2 is a human bone frame from sit bones 6, thigh bones 7, 8 and joints 9. The two horns 5 and the Supporting pieces 5a are one-piece bent tubes of circular ring-shaped profile.

Claims (8)

Claims: 1.) Office chair with a front and opposite the seat plate reclining back supports, characterized in that their pivot axis extends above the seat plate (1) and in front of the backrest (2). 2.) Office chair according to claim 1, characterized in that the joints of ends (3, 4) of the arms of the seat plate and the backrest are formed (Fig 1). 3.) Office chair according to claim 1, characterized in that the pivot axis is disembodied and dominated by segments of a circle below the seat plate (Fig 2). 4.) Office chair according to claim 3, characterized in that the circle segments the back support are rolling-body-mounted, sliding-adjusting horns. 5.) Office chair according to claim 3 or 4, daduroh gekennleichnet that the segments of the circle are abeatated by Pedern. 6.) Office chair according to one of claims 1 to 5, characterized in that that the joints can be fixed or frictionally clamped by clamping. 70) Office chair according to one of claims -1 to 6, daduroh gekenn seichnet, that the lower edge of the backrest is approximately level with the pivot axis. 8.) Office chair, in particular according to one of claims 1 to 7, characterized gekennseichnet that the pivot axis (A) of the back support (2) is at the level of the joint centers the thigh neck balls (9a) or the iliac crest extends 9.) office chair after one of claims 1 to 8, characterized in that the pivot axis (A) the backrest (2) at the level of the joint centers of the femoral neck balls (9a) or of the iliac crest and that the lower edge of the back support is approximately in half the height of these joint centers.