The present invention relates to a chair having supporting mem be ^* r ^* -> •■■-for the posterior and the shins, respectively, of a chair occupant, said supporting membeiΞ being mechanically interconnected.

Such a chair is inter alia known from the German industrial design MR 18742 and European patent application No. 80.301.394.5 (publication No. 0018812). Further, from DE-OS 2334400 it is known a chair with respective supporting means extending from a base on the floor and where the respec¬ tive supporting .members ^* are individually adjustable as regards level above the base. This solution will be impractical in use, and it does not offer any possibility for turning in the chair without the shins disengaging the shin supporting means.

Thus, it has been desirable to provide a chair which may easily be adjusted in level, which requires a minimum of space and simultaneously is movable on a floor. It is also desirable to provide easy means for attaching a work table to a chair of ^' this kind.

In order to fullfill these requirements, the invention pro¬ poses a chair, the characterizing features of which will appear from the attached claim 1 as well as the subσlaims depending therefrom.

The invention will be described below with reference to the enclosed drawings.

Figures 1 and 2 illustrate a first embodiment of the chair.

Fig. 3 illustrates a second embodiment of the chair.

Figures 4 and 5 illustrate a detailed view of the shin and

posterior supporting member,respectively, in figure 3.

Figures 8 and 9 illustrate the frame member extending betwe- en the supporting members according to the embodiment of figures 1 - 3, and figures 6, 7, respectively.

Figure 10 illustrates the lifting and lowering mechanism of figures 1 - 3.

Figure 11 illustrates a fourth embodiment of the chair provided with a work-table device.

Figure 12 illustrates the work-table device.

Figure 13 illustrates construction of the work-table from below.

Figure 14 illustrates a fifth embodiment of the chair accor- ding to the invention.

The supports for the shins and the posterior are indicated by the reference numerals 1 and 2, respectively, in figure 1. ^* These supporting members are interconnected by means of an inclined frame part 3, e.g. a metal tube. The metal tube may, as appears from figure 8, have e.g. the form of an S. The frame part 3 has at its lower end a tranyerse member 4, which by means of bolts 5 is attached to the shin support 1. In order to provide that the supporting members to a certain extent yield upon the positioning of the shins of the chair user, elastic means 6, e.g. rubber blocks are located betwe¬ en the transverse member 4 and the support 1. These rubber blocks 6 may of course be replaced by a rubber plate, as will be described below.

At the upper end of the frame part 3, an attachment means 7 has been provided, by means of which the support 2 for the posterior may be connected to the frame part 3, e.g. by means of screws ^* 8. A release arm 3 is in addition provided

at the upper region of the frame part, which release . arm upon operation,controls a lifting- and lowering mechanis 10, known per se, as will appear from figures 1 - 3. The upper end of the mechanism fits into an attachment femal member 11 located on the frame part 3. The releasing means for the mechanism 10 is labelled 12 in figure 10. Upon ope¬ ration of the arm 9, the pin 12 is acted upon, whereby the mechanism 10 is released, and the said supporting mem- bers may then in a single operation be lifted or lowered to the level which suits the user.

It is, however,readily understood that the mechanism 10 may be replaced by a conventional level adjustment mechanism, e.g. of the kind having a clamping device.

The lifting and lowering mechanism is at its bottom termi¬ nated by a base member 13., which e.g. has four or five legs, such as the legs 14, 15, 16, 17 and 18 in figures 1 - 3, or the legs 19, 20, 21 and 22 in figures 6 and 7. These legs 14 - 18 and 19 - 22, respectively, are at their respec¬ tive free outer ends provided with roller means 23, which provide the chair with the desirable mobility. In this manner, it is obtained a chair which is adjustable both as regards level as well as being turnable about the vertical axes, since the parts of the mechanism 10 are mutually co- axially turnable, and together with the rollers 23 operating in the horizontal plane, provide an improved mobility, be¬ ing of importance e.g. when adjusting the distance from a table, a desk or the like.

As will appear from figures 1, 4 and 6, the supporting member

1 has preferably a recess 24, in order to provide the best possible shape of the frame part 3. It is, however, within the scope of the invention that the supporting member 1 not necessarily will have a design as indicated, e.g. when the lower part of the frame is fully adapted to the shape of the supporting member 1. The supporting members 1 and

2 may in such case have substantially the same design. The

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supporting members 1 and 2 as shown in figures 4 and 5 have in the example shown a heart shape, although these supporting means may equally well have a substantially rectangular form, e.g. with rounded corners, as shown in figures 1 - 2 and 6 - 7.

A modified embodiment of that in figures 1 - 3 is illustra¬ ted in figures 6 and 7. The frame part, which in figures 1 - 3 is made from a tube, is in the modified embodiment made of laminated wood and is labelled 25. The legs of the base 13 are made of two parts 27 and 28, which are joined together by means of screw connections 26 or the like, thereby encompassing the lifting / lowering mechanism 10 at the lower region thereof. As clearly appears from figures 6 and 7, as well as f om figures 1 - 3, the legs have at their resrsective outer free e ^' nd roller means 23.

As will appear from figure 9, this embodiment of the frame part 25 departs somewhat from the solution according to fig¬ ure 8, although the mode of operation is the same. At its lower end, a transverse member 29 has been attached, and on its upper face is provided a plate member 30 of elastic material, e.g. rubber. At its upper end, the frame part 25 is provided with the previously mentioned attachment member 7. Since the frame part 25 consists of laminated wood, the release arm 9 and the attachment female member 11 must be mounted on a bracket 31, which is screwed onto the frame part 25, as indicated in figure 9. The attachment of the suppor¬ ting members 1 and 2 onto the frame part 25, is like that described in connection with figures 1 - 3.

In order to provide a work-table on a chair of this kind, it is proposed to remove a sealing member from the front of the frame part tube 3 and insert a tube 32 into the front end of the said frame part tube 3. The end 33 of the. tube 32 must therefore have a dimension which enables it to fit into the tubular front end of the frame 3. The tube 32 is substantial¬ ly axial with the lower region of the frame part 3 in a

forward direction and thereafter at the front edge of the supporting member 1 at the middle portion thereof substanti¬ ally extends vertically upwards.The tube 22 is at its top provided with a supporting member 34 for the table top 35. Further, there are provided two laterally disposed supports 36, 37, which at their lower inwardly bent ends are attached to the outer ends of the transverse member 4 by means of the said screws 5 or by other screws which fit into holes in the

10 transverse member 4.

Like the tube 32, the lateral supports 36, 37 are preferably also tubular and bent approximately like the tube 32. The vertical portion of the tube 32 is connected to the lateral y,c supports by means of rivets, by welding or by screws. The lateral supports 36, 37 are at their upper ends bent in the direction of the supporting means 2 and are connected to the supporting means 34 at the rear end thereof, as will appear from figure 11. 0

As shown in figures 11 and 13, the table top 35 is provided with a second attachment member 38, which is slidably con¬ nected to the first attachment member 34, in order that the distance between the supporting members 2 for the posterior 5 and the table top 35 can be adjusted. From figure 12 it appears that the attachment member 38 is provided with slide means 39 which co-act with slide rails 40 on the said second attachment member 38. The table top may by means of an attac ment arm 41 which is provided on the first attachment member 0 32 form engagement with teeth 42 provided on the slide rails 40 of the attachment member 38 thereby fixing the relative position of the first and second attachment members 34 and 38 in the preferred selected position.

In order to avoid that the chair with its installed table top tilts in a forward direction when a person sits on the chair, it is preferred that the base member either has sufficient weight to prevent such action or to let the arms of the base member have such length that sufficient

stability is obtained.

In the case when the base member and the frame part 3 is made from laminated wood, it is within the scope of the invention to adapt the embodiment such that the tubular supports 32, 36, 37, e.g. can be made of laminated wood and be at¬ tached to the transverse member 4 and connected to the frame part 3 by means of a screw connection or a male/ female connection. The attachment of the table support onto the attachment member 34 can be made in a manner known per se by means of suitably designed brackets.

The embodiment of figure 14 is a minor variant of the pre- vious embodiments shown in figures 1 - 3. The lifting/lower¬ ing mechanism 10 has a centrally disposed member 10' , which upon operation of the release lever 9 will move rela¬ tive to the lower, surrounding member of the mechanism 10. The f ame part 3 ^r which forms a link between the supports for the shins and posterior of the chair occupant, is con¬ nected to the said centrally disposed member 10' at the upper end thereof by means of a bracket 11' , as clearly shown. The attachment member for the posterior support is labelled 7 ^τ . The uppermost end of the member 10' is attached to t e attachment means 7' by means of the previously des¬ cribed attachment female member 11.

It is readily understood that the embodiments described and shown only serve as examples and that these may be modi¬ fied and replaced by technical eσuivalents without departing from the scope of the invention.

Further, it is possible to modify the shape of the supporting members for the shins and posterior, the mutual dimensions of the individual part, the number of legs in the base member, the configuration of the frame parts, the lifting/ lowering mechanism etc. without departing from the scope of the invention.

By means of the present invention, there is provided a chair having a maximum of mobility while the person occupying the chair assumes a kneeling-like sitting posture .