EP0098493A2 - Chair - Google Patents

Abstract

1. A chair (50.1 - 50.5) with at least a leg frame (51), seat (52) and back (53), wherein the legs (65) are inclined for stacking and the seat (52) and back (53) are secured by connecting means to the leg frame (51), the seat width (57) corresponds approximately to the leg frame external width (58), the seat (52) its cut away at the corner regions (52.1, 52.2, 52.3, 52.4) in a manner corresponding to the position and size of the legs (65) and the legs (65), which lie in the corner regions (52.1, 52.2, 52.3, 52.4) of the seat (52) and which are attached below the said seat and extend almost parallel to the vertical central plane (54), consist of metal profile and, in order to be stackable, have recesses in their external faces, such that, when stacked, the upper leg engages in the lower leg, characterized in that the metal profile of the slender legs (65) has a dumb-bell-shaped cross-section (Fig. 8-11), such that when the chairs are stacked, the thickening (72) of the dumb-bell-shaped cross-section of the upper leg (65) engages in the recess (73) of the dumb-bell-shaped cross-section of the lower leg (65).

Description

The invention relates to a chair with at least the leg frame, seat and backrest, in which the legs are inclined to stack and in which the seat and backrest are fastened to the leg frame with connecting means.

Chairs are among the oldest articles of daily use in humans and are therefore known in an almost unmanageable variety of designs. These configurations are based not only on the actual purpose of sitting or sitting comfortably, but above all on the manufacturing options, the manufacturing costs and, among other things, the options for providing the chair with other objects, such as armrests or coupling devices, for stringing together or various Build chairs from largely similar parts. In addition to wooden leg frames, a variety of metal frames are known. There are two main groups. Some have legs made of pipes and the others have legs made of solid materials manufactured using extrusion, casting or other molding processes. Steel, aluminum and glass fiber reinforced plastics are mainly used. The tubular steel frame usually has a round or square cross section. Chairs that often have to be removed and stored from a hall or the like are designed to be stackable. There are basically two options, namely that of plugging one on top of the other or plugging into each other from the front. In the case of chairs which can be plugged one above the other, legs which have been positioned relatively obliquely and come together in the area of the center of gravity support or close to this have been chosen, which are arranged approximately in a V-shape. These legs are outside the seat because the relatively flat legs have to slide past the seat over a longer length. Such chairs are explained, inter alia, in DE-OS 20 35 974, 25 59 196, 26 24 492 and are also widely known in practice in other configurations. Their appearance with the legs lying outside the seat and approaching the center of gravity in a V-shape is considered by many interior decorators to be too sober, so that they immediately give the room the character of a simply furnished room. There is therefore a need to provide a stackable chair that has an appearance that approximates or approximates that of a normal chair. Such Chairs are known as stacking chairs, for example from DE-GM 77 08 560 and DE-AS 28 00 564. These have round, approximately vertical tubular legs, but the rear legs are offset from the front to the outside, so that the front legs can be inserted in front of each other and the rear legs next to the seat. These chairs also do not allow the appearance of a normal chair with a wide seat to be achieved. In the case of chairs which can be inserted from the front according to DE-AS 23 53 341, an arrangement of four vertical legs is not provided and not possible, but rather a U-shaped bracket must be provided in spaced apart planes. This chair cannot be given the appearance of a chair for a living room or cozy meeting room either. The leg constructions of these chairs each require special, usually quite complex manufacturing and connection techniques.

Furthermore, a stacking chair made of glass fiber reinforced plastic is known in practice (so-called Bofinger chair), in which four legs are integrally formed on the one-piece seat and backrest shell in such a way that the front legs start in the corners of the seat surface, while the rear legs are slightly outside the seat side edge lines are formed so that they are slightly further out than the front legs. All legs are angular in profile with the roof edge pointing towards the center, so that they can interlock when stacked. This chair can be used as a stacking chair, but not as an add-on chair, because the legs are slanted outwards and there are larger gaps between the seats.

Based on this prior art, the invention has for its object to provide a chair that is designed both stackable and stringable and with the widest possible seating in a row can be placed very close to the next chair and should also be stackable as vertically as possible when stacking and should be as similar as possible to a chair not intended for stacking and lining up.

According to the invention, at least one leg frame, seat and backrest, in which the legs are inclined to stack and in which the seat and backrest are fastened to the leg frame with connecting means, are provided on a chair such that the seat width corresponds approximately to the outer width of the leg frame, the seat in corner areas the position and size of the legs is excluded accordingly and the cross-sections in the far-out corner areas of the seat under this slender metal profile legs have a cross-section that is roughly dumbbell-shaped or double-rifle-shaped in such a way that when stacked, the thickening of the upper leg into the indentation of the lower leg engages.

Whereas in previous stacking chairs the legs, and at least the rear legs, protruded beyond the width of the seat in the middle, the seat now extends beyond the width of the leg frame. For this, the corner areas in which the legs pierce from above when stacked, in particular also in the rear area, are excluded, that is to say cut off or omitted, so that these areas are free.

They are also not required to support the seated person if they are moved far enough to the rear and to the front. This also makes it possible to tilt the legs only slightly so that they are almost vertical. In order to be able to stack them anyway and to create a stable but slender leg, a shape is selected which, with great stability, that is to say a favorable area moment of inertia, has areas which are closer to the central axis, so that the further protruding thickenings are achieved by appropriate inclined arrangement of the legs can intervene in the indentations when stacked. Such a leg frame can be easily bent from tubes that are easy to manufacture, and with simple and inexpensive means under and with the seat the backrest. Since it is preferably a tubular frame, the relatively large outlay for large-volume die-cast parts can be avoided, and nevertheless an aesthetically interesting appearance deviating from the usual round tube and square tube or rectangular tube is obtained.

The interlocking of the profiles allows you to achieve a very low stacking height despite the legs lying far out and almost vertically, so that many chairs can be stacked on top of each other in a small space. Because of the vertical stacking, no complicated angular stacking trolleys and the like are required and the stacking space can be optimally used. With the exception of the V-shaped legs next to the seats, almost all other known stacking chairs require stacking to the front or to the rear, so that the push of chairs must be brought into the transport and storage position by suitable aids so that it does not fall over.

The leg frame can be designed in a variety of ways using the appropriate metal profile if only the legs, as described above, protrude slightly beyond the cut-out corner areas. A particularly easy to manufacture stable and easy to connect to the seat and backrest design provides that the leg frame consists of two dumbbell profile flat tube parts, each having two bent down legs and a multi-bent connector under the seat, where Both parts are connected to each other under the seat and carry the connection means for the seat and backrest. Other components can also be used to connect the leg parts to one another. The design is particularly simple and stable, however, if the two frame parts are welded to one another in the area of parallel connecting pieces and each have an angle on one side in the direction of the corner of the seat and an angle of the leg there. A straight piece of pipe only needs to be angled four times and only two identical parts need to be welded together to create an appealing, stable and light stacking leg frame.

Different designs are possible for the dumbbell-shaped flat profile, in particular flat tube profile. In particular, it can be designed in the manner of a gun barrel and z. B. be composed of partial circles, for example consist of two approximately three-quarter circles and intervening inward curved quarter or third circles. This rounded profile is not prone to bulging and can support the high loads cheaply even with low material requirements. The flat tube profile can also be formed from two squares facing one another, the corners turned towards one another merging. You can also form the flat tube profile from two directly adjoining hexagons or from octagons with corresponding connecting bars. The profile tubes can be formed from flat sheet metal using the rolling and rolling process and, above all, longitudinally welded in the area of the indentation. You can also deform a seamless pipe accordingly.

Stacking supports are usually provided in the area of the seat on the seat and / or leg frame for stacking. The special leg design with the dumbbell-shaped profile, which anyway, like with any metal chair, requires a glider at each leg end, allows this to be used as a stacking support element at the same time, since the legs have insertable gliders that are designed in accordance with the dumbbell-shaped tubular profile and unite in the outer arch have profile-matching stack support spigot that extends to the stack support surface and is molded onto the lower connecting and support plate of the slider. Thus, with an element that is easy to produce in the plastic injection molding process, the end of the pipe base and the support during stacking can be closed at the same time can be combined, which is advantageous in terms of manufacturing and assembly technology and also in terms of price. The slider insertion pins or stacking support pins can have latching hooks which engage in recesses cut out in the leg profile. So they are held captive and can also support the stack weight well. A push-in tab can engage in the glider and can be screwed to the floor. For this, the glider can have a recess, so that the chairs can be fixed immovably in a room or in a garden with simple means.

The connection between the leg frame and the seat can be made in a variety of ways, for example by form-fitting engagement elements or devices with rear hooks and the like. In particular, the connecting means can contain screws, rivets or locking bolts arranged slightly to the inside of the corner bevel under the seat. This enables attachment on a large support base.

The backrest and seat can be designed, for example, as a one-piece shell or have a one-piece shell as the basis for the assembly of the upholstery. Then it only needs to be attached to the leg frame.

Another sensible design for a light, stable and above all meeting the varying wishes and needs of the customer provides that a special seat and backrest connecting and supporting part is arranged, to which the seat and backrest are attached separately. This can be mirror-inverted on both sides of the chair in such a way that a fastening and seat support leg runs approximately horizontally below the seat side edge and merges into a seat holding part which runs obliquely inwards in the area of the corner recess, to which a transitionally projecting transition part connects, which merges into a back support leg, which follows the edge area of the lower backrest part in profile and has fastening means for the backrest. Such a connecting and supporting part is relatively small and can consequently be produced inexpensively in a suitable molding process and has fastening holes or threaded pins and the like. It is then screwed to the leg frame, for example, and you can attach an appropriately related seat and backrest or simple, perforated sheet metal or similar molded parts as a seat and backrest to the partially manufactured chair depending on the customer's wishes. The connecting and supporting part is suitably made of die-cast aluminum. So it can be manufactured easily and inexpensively despite the relatively complicated shape and has a low weight despite great stability. It can also be suitable for connecting additional elements and can be designed with sufficient local strength. In conjunction with non-combustible or hardly combustible seats and backrests, it is very easy to implement chairs that meet the increased fire protection requirements, as are increasingly required, particularly in the so-called object area.

With the large number of known chairs, there is also a large variety of attachment options for armrests. Either they are made in one piece with the legs or they are attached separately. Armrest attachments are customary which have a cross strut in the region of the seat side edge, from which support arms for the armrest project upwards. The cross connection usually has two holes through which screws are screwed for fastening to the leg frame or to the seat shell. Possibly. additional fixations are planned. Fastening with two screws requires a corresponding assembly effort. This is intended to be reduced by the invention. For this purpose, a solution is proposed in which a suspension connection is created between the armrest and leg frame or connecting and supporting part between the leg frame, seat and backrest, which can be secured with a single screw.

For this purpose, the connecting and supporting part or the leg frame or the seat shell in the region of the center of the seat side edge has a fastening profile which serves to overlap and which, in addition to a seat support fold, has a supporting part which is roof-shaped in cross section, the outer edge of which merges into a fixing surface which is below at least about 100 ° to 105 ° to the outside roof slope or less than 10 ° to 15 ° to the inside roof slope and merges into a vertical screw hole leg. This profile can form a good, smooth edge area of the seat frame or its connecting and supporting part that protects against impact and abrasion of the seat cover, without the need for an armrest. For example, a row connection can also be screwed onto the vertical screw bore leg without an armrest.

In a further embodiment of the invention, however, an interchangeably fastened armrest can be provided, which has an overlap profile corresponding to the fastening profile in the lower region, which has a sufficient support width or at least spaced support surfaces and with a central bore through which a single clamping screw is provided grips that clamps the entire armrest to the fastening profile.

The connecting and supporting part with the vertical screw bore leg can, if necessary, be attached to a row connecting element, which is designed, for example, like a U-shaped profile, one leg of which is shaped into two flat pins, which go up on one side of the chair and down on the other side are directed below and are assigned corresponding recesses in the web profile. In order to design a modular connecting element that is suitable for attachment to a simple and armchair chair and thus alternate the width of a simple chair and armchair chair without losing space To be able to allow, a further embodiment of the invention provides that the baying connection consists of a profile part made of metal or plastic fastened in the central region of the chair side, which has two spaced apart flat pins, between which a V-recess formed with a rounded base preferably remained and wherein / the bottom area is equipped with through openings for the flat pin tips of the adjacent element. Such a V-recessed element can be used for any baying connection. For connection to an armrest chair to assigns him a Einhängekragenteil to, through which the fixing screw of the arm extends such that the collar around the Flachza fenstärke ^p projects beyond the outer surface of the armrest attachment such that the collar member from above or below in the rounded V Recess of the adjacent chair can be hooked. For example, only a longer screw with a small cylinder part and a larger washer or a correspondingly manufactured collar part needs to be attached to the armrest chair and it can be attached to simple chairs with the connecting elements by simply hanging them in, the distance between the chairs not increasing are needed. Then the middle of the armrest can lie above the outer edge of the foot, so that there is always an armrest in the middle between the chairs.

The armrest expediently protrudes outwardly from the fastening part with the cross connection upward support arms, which merge into bearing elements for a pivotable armrest.

A swiveling armrest is known from DE-GM 81 03 946. This is used to fold up to a narrower dimension for stacking chairs. For this purpose, it can be pivoted on a one-armed support part by means of a longitudinal pin and can be locked and unlocked by axial displacement. The storage for this is relatively complex and the armrest must be made very stable because it is only supported on one side. The invention is intended to make a two-sided support available with a simple swivel bearing and a simple latching lock. According to the invention it is provided that for the pivotable armrest, the pivot bearings have outwardly projecting bearing journals, on which the receiving recesses of a plastic armrest, which is sufficiently elastic for assembly, but sufficiently rigid for use, are seated and assigned stop surfaces for the horizontal position and the vertical position are and in the area of one end of the armrest an engagement latch connection is provided, which is associated with an elastic lever bearing such that the pivotable armrest has an elongated, vertically lying in the horizontal position slot, in which a lifting and rotating bearing element made of highly elastic plastic is arranged which has a bearing hole for the bearing journal which is offset slightly upwards from the center in such a way that the somewhat larger lower part of the lifting and pivoting bearing element is deformable for unlocking and the armrest can be raised thereby.

In addition to the two necessary parts, namely the support arms and the swivel arm rest, such a swivel bearing with lifting lock has only a single additional part, namely the lifting and pivoting bearing element, and furthermore does not require any bearing pins or fixing elements, but can be of a suitable size and material value appropriate dimensions from the standard prefabricated parts are simply put together and is then easy to use and can be easily swiveled into the two positions. Exemplary embodiments of the invention are explained and described in more detail below with reference to the drawings.

• Fig. 1 die Vorderansicht eines Stuhles;
• Fig. 2 die Seitenansicht eines Stuhles nach Fig. 1;
• Fig. 3 die Draufsicht auf zwei aneinandergereihte Stühle, von denen der linke nur teilweise und mit teilweise aufgebrochenem Sitz dargestellt ist;
• Fig. 4 die Schrägansicht auf einen Stuhl in gleicher Ausstattung, jedoch plastischer dargestellt und von vorn etwas oberhalb der Mitte gesehen;
• Fig. 5 den Stuhl nach Fig. 4 von hinten, etwas oberhalb der Mitte gesehen;
• Fig. 6 den Stuhl nach den Figuren 4 und 5 von schräg oben diagonal zwischen Sitz und Lehne betrachtet mit etwas durchsichtigem Sitz aus Lochblech;
• Fig. 7 die Seitenansicht von drei übereinander gestapelten Stühlen, wie sie in den Figuren 1 bis 3 dargestellt sind, und den Figuren 4 bis 6 entsprechen;
• Fig. 8 bis die Querschnitte von jeweils zwei übereinander-Fig. 11 gesteckten Beinprofilen in vier verschiedenen Profilausführungen, etwa gemäß der Linie 8-11 in Fig. 13;
• Fig. 12 die Vorderteilansicht von zwei übereinander gestapelten Stuhlbeinen;
• Fig. 13 die Teil-Seitenansicht von zwei übereinander gestapelten Stuhlbeinen;
• Fig. 14 die Draufsicht auf einen Stuhlbeinendabschnitt;
• Fig. 15 die Seitenansicht eines Gleiters;
• Fig. 16 die Frontansicht des Gleiters nach Fig. 15;
• Fig. 17 die Draufsicht auf den Gleiter nach den Figuren 15 und 16;
• Fig. 18 die Teil-Vorderansicht eines Stuhlbeines mit Einstecklasche zur Bodenbefestigung;
• Fig. 19 die Teil-Seitenansicht eines Stuhlbeines mit Einstecklasche zur Bodenbefestigung;
• Fig. 20 die Teil-Draufsicht auf das Stuhlbeinende mit Einstecklasche zur Bodenbefestigung;
• Fig. 21 die Vorderansicht von zwei nebeneinandergesetzten Stühlen, die den vorstehend genannten Stühlen entsprechen, jedoch mit Armlehnen und Anreihverbindungselementen ausgestattet sind, wobei der rechte Stuhl nur teilweise dargestellt ist;
• Fig. 22 die Seitenansicht eines Armlehnenstuhles nach Fig. 21;
• Fig. 23 eine der Fig. 3 entsprechende Draufsicht auf zwei nebeneinander gesetzte Stühle, jedoch mit Armlehnen und ohne Aufbrechung der Sitzfläche;
• Fig. 24 eine Schrägansicht eines Stuhles, wie er in den Figuren 4 bis 6 dargestellt ist, schräg von hinten gesehen und mit angesetzten Armlehnen;
• Fig. 25 eine Schrägansicht des Stuhles mit Armlehnen nach Fig. 24 schräg von vorn gesehen;
• Fig. 26 die Seitenansicht von drei übereinander gestapelten Armlehnenstühlen;
• Fig. 27 die Vorderansicht von drei übereinander gestapelten Stühlen mit angesetzten Armlehnenhaltern und schwenkbaren Schreibplatten;
• Fig. 28 die Seitenansicht der drei übereinander gestapelten Stühle mit schwenkbaren Schreibplatten nach Fig. 27;
• Fig. 29 die perspektivische Ansicht schräg von vorn oben auf vier aneinander gereihte Stühle, wobei die äußeren nur teilweise dargestellt sind;
• Fig. 30 die Teil-Schrägansicht von zwei Stühlen mit Anreihverbindungslementen in der Position kurz vor dem Einhängen;
• Fig. 31 eine der Fig. 30 entsprechende Darstellung von Anreihverbindungselementen an zwei benachbarten Stühlen in etwas anderem Blickwinkel und wobei der rechte Stuhl eine Armlehne und die dieser zugeordnete Anreihverbindung mit Einhängekragenteil aufweist;
• Fig. 32 die Seitenansicht des in Fig. 30 dargestellten Anreihverbindungselementes;
• Fig. 33 die Frontansicht des Anreihverbindungselementes nach Fig. 32;
• Fig. 34 die Draufsicht auf das Anreihverbindungselement nach den Figuren 32 und 33;
• Fig. 35 einen Teil-Vertikalschnitt durch die benachbarten Randbereiche zweier Stühle in der Quermittelebene im Bereich der Schrauben für die Befestigung von Armlehne und Anreihverbindungselementen;
• Fig. 36 einen Vertikalschnitt durch den oberen Bereich einer Armlehne in der Ebene der Schwenkzapfen;
• Fig. 37 eine Teilansicht der Armlehne und einen Teilschnitt längs der Linie 37-38 in Fig. 36 durch eine Schwenkarmauflage nach Fig. 36;
• Fig. 38 einen Teilvertikalschnitt längs der Linie 37-38 in Fig. 36 mit Stirninnenansicht des Lagerschenkels mit ovaler Lageröffnung, etwa entsprechend Fig. 37, jedoch ohne Armlehnenlagerteile;
• Fig. 39 die Vorderansicht eines Anhebedrehlagerelementes für das Lager der Schwenkarmlehne nach Fig. 38;
• Fig. 40 einen Vertikalschnitt längs der Linie 40-40 in Fig. 39;
• Fig. 41 die Draufsicht auf das Anhebe- und Drehlagerelement nach den Fig. 39 und 40.

Show it:

• Figure 1 is a front view of a chair.
• Fig. 2 shows the side view of a chair according to Fig. 1;
• Figure 3 is a plan view of two chairs lined up, the left of which is only partially and with a partially broken open seat.
• Figure 4 shows the oblique view of a chair with the same equipment, but shown more vividly and seen from above slightly above the middle.
• 5 the chair according to FIG. 4 seen from behind, somewhat above the middle;
• 6 shows the chair according to FIGS. 4 and 5 viewed diagonally from above diagonally between the seat and backrest with a somewhat transparent seat made of perforated sheet metal;
• 7 shows the side view of three chairs stacked one above the other, as shown in FIGS. 1 to 3 and corresponding to FIGS. 4 to 6;
• 8 to the cross sections of two superimposed-each 11 inserted leg profiles in four different profile designs, approximately according to line 8-11 in Fig. 13;
• 12 shows the front partial view of two chair legs stacked one on top of the other;
• 13 is a partial side view of two chair legs stacked one on top of the other;
• 14 is a top view of a chair leg end portion;
• 15 is a side view of a slider;
• 16 shows the front view of the slider according to FIG. 15;
• 17 shows the top view of the slider according to FIGS. 15 and 16;
• 18 shows the partial front view of a chair leg with an insertion flap for fastening to the floor;
• 19 shows the partial side view of a chair leg with an insertion flap for fastening to the floor;
• 20 shows the partial top view of the end of the chair leg with an insertion tab for fastening to the floor;
• Fig. 21 is a front view of two side-by-side chairs which correspond to the aforementioned chairs but are equipped with armrests and bay connection elements, the right chair being only partially shown;
• 22 shows the side view of an armrest chair according to FIG. 21;
• 23 shows a plan view corresponding to FIG. 3 of two chairs placed next to one another, but with armrests and without breaking the seat;
• 24 shows an oblique view of a chair, as shown in FIGS. 4 to 6, seen obliquely from behind and with attached armrests;
• 25 is an oblique view of the chair with armrests according to FIG. 24 seen obliquely from the front;
• 26 shows the side view of three armrest chairs stacked one above the other;
• 27 shows the front view of three chairs stacked one above the other with attached armrest holders and swiveling writing plates;
• FIG. 28 shows the side view of the three chairs stacked one above the other with swiveling writing plates according to FIG. 27;
• 29 shows the perspective view obliquely from the front above on four chairs lined up, the outer ones being only partially shown;
• 30 is the partial oblique view of two chairs with baying connection elements in the position shortly before the hanging;
• 31 shows an illustration corresponding to FIG. 30 of baying connecting elements on two adjacent chairs from a somewhat different angle of view and wherein the right chair has an armrest and the baying connection with hanging collar part assigned to it;
• Fig. 32 is a side view of the bay connector shown in Fig. 30;
• 33 shows the front view of the baying connecting element according to FIG. 32;
• 34 shows the top view of the baying connecting element according to FIGS. 32 and 33;
• 35 shows a partial vertical section through the adjacent edge regions of two chairs in the transverse median plane in the region of the screws for fastening the armrest and bay connecting elements;
• 36 shows a vertical section through the upper region of an armrest in the plane of the pivot pins;
• 37 shows a partial view of the armrest and a partial section along the line 37-38 in FIG. 36 through a swivel arm support according to FIG. 36;
• 38 shows a partial vertical section along the line 37-38 in FIG. 36 with an end view of the bearing leg with an oval bearing opening, approximately corresponding to FIG. 37, but without armrest bearing parts;
• 39 shows the front view of a lifting pivot bearing element for the bearing of the swivel armrest according to FIG. 38;
• 40 shows a vertical section along the line 40-40 in FIG. 39;
• 41 shows the top view of the lifting and rotating bearing element according to FIGS. 39 and 40.

The chair 50 shown in the figures is provided with decimal digits from 1 to 5 to differentiate its design variants. These are omitted from general treatises for the sake of simplicity, since the basic structure of all chairs is the same.

The chair 50 consists of a leg frame 51, a seat 52, a backrest 53 and two connecting and supporting parts 55.1 and 55.2 arranged symmetrically to the longitudinal axis 54 of the chair.

The seat 52 has a seat width 57 and the leg frame has a leg frame outer width 58. As illustrated in FIG. 1, these are almost the same, so that the legs 65 are arranged under the seat 52 and not to the side of the seat as in conventional stacking chairs. The seat is, as can be seen in the plan from Fig. 3, approximately octagonal with unevenly long sides, so that the corner areas 52.1 to 52.4 are cut out, while the front boundary line 52.5 and the rear boundary line 52.6 are slightly rounded. The side edges 52.7 and 52.M are straight and parallel to each other. The seat 52 can be designed as a profiled wooden shell or plastic shell, as a padded wooden or plastic shell or as a profiled sheet metal shell or, as shown in FIG. 6, as a perforated sheet metal shell.

The connecting and supporting part 55 is best seen in FIG. 5. One is provided on each side. It extends the profile of the seat side edges 52.7 and 52.8 and the boundaries 52.9 of the bevels of the corner areas 52.3 and 52.4 initially with a fold 125 under the seat shell and represents the outer boundary of the seat with its outer edges. In the rear part of the Corner areas 52.3 and 52.4 are connected to the approximately horizontally running fastening and seat support leg 55.3 and the seat holding part 55.4 is a transversely projecting transition part 55.5 which merges into the back support leg 55.6, which roughly follows the outer contour of the backrest 53. The backrest 53 is Shaped here similar to the layout of the seat 52 and has an octagonal basic shape with uneven sides, parallel outer edges, corner areas cut off at approximately 45 ° and slightly rounded upper and lower edges. It is narrower than the seat 52. The back support leg 55.6 of each connecting and supporting part 55 extends essentially only along the lower corner slope and approximately to the middle of the parallel side edges. Suitable connecting means, such as screws 59, are used to fasten the backrest shell.

The connecting and supporting parts 55 have under their horizontal fastening and seat support legs 55.3 and 55.4 cylinder lugs 55.7, which are arranged slightly inward to the oblique boundary line of the corner recesses 52.1 to 52.4 and have receiving holes for screws 60 for fastening to the leg frame 51 as components of the connecting means . Rivets or locking bolts or the like can also be used here. 3, four fastenings are provided, which are indicated by the crosses 60.1. There are the cylinder lugs 55.7.

The assembly of the seat 52 and backrest 53, as described above, rests on the leg frame 51. This consists of two flat tube parts 61, which, as shown in FIG. 3 on the left, each have a horizontal connecting piece 62 running normal to the longitudinal axis 54 of the chair, from which in the direction an angled area 63 in the bend 64 is angled onto the respective corner and runs straight under the attachment 60 through to the beveled corner area 52.1 to 52.4. There, the leg 65 is angled downward at 66 in each case. As illustrated in FIG. 1, it has a practically vertical course downward in the front view, while in the side view — as illustrated in FIG. 2 — it is inclined outward at an angle 67 of approximately 12 ° to the vertical. These two flat tube parts 61 are completely identical and are bent at the same angles and in the area

their connectors 62 welded together at 68. The flat tubes consist of sheet steel tubes with a special profile. This profiling is designed and arranged in a special way to achieve high stability with good stacking possibility and low stacking height. The major axis 71 is approximately below 45 ^° to the longitudinal axis 54 of the chair.

Some possible and useful profile shapes are shown in FIGS. 8 to 11, two adjacent profiles as they come together when stacking are shown. The profile of FIG. 8 corresponds to that of the chair representations in the other drawings, while the profiles of FIGS. 9 to 11 represent design variants which are not shown in the other drawings, but whose profile can also be used to design the legs.

8 consists of a relatively thin steel sheet of approximately 5 mm and has two outer part-circle or part-cylinder regions 72.1 and 72.2 which represent the thickenings 72 of the dumbbell-shaped flat tube profile 70.1 and which each comprise three quarters of a circle. This is followed by the middle or connecting area, which represents the indentation 73, is approximately quarter-circular, but has a larger radius. The outer radius of the thickenings 72 corresponds to the inner radius of the indentation 73, so that the thickened portion 72 of a leg that is plugged in fits into the indentation 73 of the leg underneath. On the one hand, this interlocking design saves a considerable amount of space between the piles, because the inclined position of the legs would have a considerable effect on the height by a few millimeters. On the other hand, the legs of chairs placed one above the other are fixed against each other by the interlocking and there is no need for further fixing means. In addition, the leg gets a very slim appearance with quite great stability and still has the cheap, shell-like reinforcement properties shafts that otherwise have mainly round tubes. In addition, there is a flat profile, on which a support for the attachment of seat 52 or connecting and supporting part 55 can be made cheaply. Openings can also be made well. The profile is also favorable for the deformation in the corners 64 and 66 when bending, but offers good stability properties after the deformation. If the flat tube section 70.1 is bent and rolled from sheet metal and welded together, it is expedient to weld it in the indentation 73 at 74 by means of a longitudinal seam. The distance between the center of the circle 75 of the two thickenings is expediently 21 mm, while the outer radius of the thickening and the inner radius of the indentation are approximately 8 mm. Such a profile can be produced endlessly, simply cut off and well bent and welded in order to economically create the leg frame 51.

FIG. 9 shows an interesting embodiment variant in which the outer boundary of the flat tube profile 70.2 is formed by straight side walls 82 by two hexagons, the coinciding connecting wall not being present. The result is a double hexagon, which, as can be seen, can also be stacked cheaply and has similar dimensions. This can also be welded in the area of the indentation bend 83.

The flat tube profile 70.3 according to FIG. 10 is also designed with thickenings and indentations, in which two squares are directly connected to one another and their side walls 86.1 and 86.2 in the region of the indentation 85 are each directly connected, either by bending or welding. These profiles also interlock very well and with a small distance between their axes.

FIG. 11 illustrates a further profile 70.4, the thickenings 87 being formed by equilateral octagons, the walls of which facing one another are omitted and those with connecting walls 88 of the same length are connected in one piece in the region of the indentation 89 and can be welded to one another at a suitable internal location. Here, too, there is good interlocking, despite a relatively small distance and good mutual locking. All the profiles discussed above have approximately the shape of dumbbells in the plan, which is why this term was used in the main claim. You can also describe the entire barrel as a double rifle barrel design if you do not focus on the profile but on the barrel. Other similar designs are possible. It is essential that external thickening areas and internal indentations interlock and that a stable profile is present, which is closed at least in large partial areas, which can preferably be tubular, but also partially or completely solid.

The lower end of each leg 65 of the leg frame 51 made of the dumbbell-shaped flat tube profile 70 is to be closed off with a slider 90 in order to ensure damage-free support of the tube end on any floor in question. Such sliders are usually made of plastic by injection molding and provided with insertion pins for the pipe end. In the present case, a special design has been chosen which serves several purposes and which is adapted to the stackable flat tube profile 70.

The slider 90 has a connection and support plate 91, the base and contact surface 92 of which is inclined to the pipe end surface 65.2, which is normal to the pipe axis 65.1, in accordance with the inclination of the legs at 6% angles from 7 ° to 12 °, as can be seen from the figures . At a distance from the thickenings / semicylindrical insertion pins 93 are provided so as to protrude. These are inserted into the pipe end. In this respect, the construction is common, except for the adaptation to the pipe profile. The connecting and supporting plate 91 serving as the base plate is on the 73 70 outside over the indentation / of the tubular profile / widened approximately triangularly at 94 and here carries a stacking support pin 95 which matches the profile of the dumbbell-shaped flat tube 70 of the leg 65 and adapts to it with the formation of an inner recess 95.1. It ends at the top in a correspondingly inclined stacking support surface 96, which is also inclined in accordance with the lower inclination so that the feet can rest well on it when stacking, as can be seen from FIGS. 12 and 13. The distance 96.1 of the lower base and contact area 92 from the stack support surface 96 is approximately 90 mm, which corresponds to the low stack height of the chairs. The stacking support pin is located in a pipe area in which it does not interfere with taste or use. However, it lies with sufficient wall thickness in the support area of stacked feet. Since it is of relatively long design, it could tend to pivot out when the material is not sufficiently stable or the insertion pins 93 are too short. For this reason, it has a profile-matching inner region on its head 97, on which a latching hook 98 with a latching lug 98.1 is formed. At a corresponding point, a correspondingly large and shaped recess is punched out in the tubular profile, into which the latching hook 98 with its latching lug 98.1 can be snapped into place. The inserted glider 90 is not only perfectly secured against being pulled out, but also against tipping to the side.

In its lower area, the slider 90 has an insertion recess 99, into which a twice angled insertion tab 100 is inserted and can be screwed through the tab bore 101 with the aid of a screw 102 into a dowel 103 in the floor, if this is desired. Because of the relatively wide and sufficiently thick design of the foot of the slider 90, there is sufficient space to provide such an insertion flap 100 which is also secured against lateral pulling out.

The chair described above can, if necessary, be equipped with armrests and / or bay connecting elements.

In Figures _{21 u} . ₂₉ to ₃₅ is illustrated, such as chairs 50 may be connected together by Anreihverbindungselemente 110th For this purpose, a modular connection element 110 which is similar to the previous elements of this type, but is somewhat more specifically designed, is provided on the one hand, which is clearly evident in particular from the perspective representations. It has a base body 111 with a contact surface 112, which is adapted to the outer profile of the seat or the connecting and supporting part 55, and has in the middle a screw hole 113 through which it is connected to the connecting and supporting part 55 with a single screw 114 is screwed tight.

The connecting and supporting part 55 has in its edge region a fastening profile with a supporting part 55.8 which is roof-shaped in cross section, the outer surface 55.82 of which is angled and merges into a fixing surface 55.83, to which a vertical leg 55.9 is connected, in which a bore 108 for receiving the screw 114 is also included a profile-fitting recess for a nut 109 is provided. This angled arrangement of the surface 55.83 and the vertical leg 55.9 is followed by the outer contour of the base body 111 of the bay connection element 110. The contact surface 112 of the bay connection element 110 is, as can be seen in FIGS. 32 and 35, mirror image or rotationally symmetrical to the screw hole 113, that is to say on both sides bevelled in accordance with the angle of the fixing surface 55.83 so that the baying connection element 110 can be mounted on the envelope, i.e. with the tips of the flat pins 115 upwards and on the other side with the tips of the flat pins downwards. The bore 108 for the screw 114 is arranged in an approximately square prismatic thickening part 55.91 of the vertical leg 55.9, while the rest of this has a smaller wall thickness. This thickening part 55.91 serves as an eye and has a width of approximately 16 mm. At the appropriate distance are as an assembly aid and Anti-rotation aid on the bay connection element 110 is formed by two pins 112.1 which lie next to the thickening part 55.91 of the vertical leg 55.9.

On the row connecting element, two flat pins 115 are formed on the outside, forming a slot 119 in the manner of a U-shaped profile, which leave a V-shaped recess 116 between them with a rounded base 116.1. They are connected to the base body 111 via a base region 117 and small transverse walls 118, so that there is good stability for the flat pins even with a relatively small wall thickness. In the bottom area 117, two suitably arranged and dimensioned recesses 117.1 are provided, into which the flat pin tips 115.1 can enter if the baying connection is made with two identical baying connection elements mounted in opposite directions. In this respect, it is a type of bay connection that is known from the basic principle, but not from the structural design. However, this is now further developed to be able to mount an armrest 130 without loss of distance and to provide a further simple baying element. This can be seen particularly clearly from FIGS. 31 and 35. A longer screw 114.1 is guided below through the clamping leg 131 of the armrest 130 through the central bore 131.1, the head of which is seated in a suspension collar part 120, which consists of the collar 120.1 and the neck part 120.2 or a washer and a spacer tube, and so on Extends and is dimensioned beyond the outer surface 132.1 so that, as can be seen from the figures, the neck 120.2 can engage in the rounded V-recess 116 of an adjacent chair, while the collar 120.1 in the slot 119 between the base body 111 and the flat pin 115 of the baying connection element 110 engages, as can be clearly seen in FIG. 35. The attachment can take place either from above or from below, depending on how the row connecting element 110 is mounted. Because chairs are usually on are provided with armrests on both sides and then alternately connected to chairs without armrests in the row, the chairs with armrests also carry the hanging collar parts 120 on both sides and, because of the symmetrical arrangement of the hanging connecting part 110 which can be mounted on an envelope and are otherwise adapted, can be used with any armrest-free arrangement Chair. All that is required is a longer screw and the simple hook-in collar part on the armrest chair. This is in the rest in a recess 132 of the armrest 130 of sufficient size so that the engagement with the flat pin 115 can be made properly, but on the other hand, the hanging collar part does not protrude beyond the outer edge 133 of the armrest 130.

The armrest attachment is otherwise designed as described below. The armrest 130 can be attached to the chair 50 described above either at any time during manufacture or later. The armrest 130 has a fastening part 135, the clamping leg 131 and trough 132 have already been mentioned. From the mounting portion 135 project approximately V-shaped arrangement, upwardly striving support arms 136, on which by means of pivot bearings 137 a pivotable _A rmauflage is mounted 138th The pivotability is necessary for stacking and to enable the arrangement in the middle above the outer edge 90.1 of the seat and is dealt with below. As can be seen from the side views of the chairs, in particular FIG. 2, the fastening part 135 has a certain width dimension 139 of approximately at least 90 mm, so that a secure and wobble-free fastening is possible with the single screw 114.1. The fastening part 135 has, as can be seen in FIG. ₃₅ , an overlapping profile 141 which is adapted to the roof-shaped profile of the supporting part 55.8 and has two overlapping lugs 142 spaced apart from one another or a longer overlapping profile. The outer roof surface 55.82 is arranged at 90 ° to the inner roof surface 55.81 and merges into a fixing surface 55.83, which is inclined by approximately 15 ° to the inner roof surface that a wedge results and the overlap profile 141 can be slid on while sitting and when the screw 114.1, which protrudes through the clamping leg 131, is held firmly and permanently in place. The connection and support part 55 has a seat support fold 125 on the inside, on which the seat shell is placed and fastened with suitable screws or the like. The profile design for the seat limitation is favorable due to the roof-shaped profile with rounded edges, even for normal use without connecting an armrest, because it forms a stable edge protection and still does not hinder when sitting, especially since the seat is especially designed because of the special design of the entire chair this area can be designed very broadly. However, the profile is also designed so cheap that if it is manufactured using the aluminum die casting process or another suitable process, an armrest that is otherwise not further processed can be attached and even attached with a single screw to form a baying connection.

FIGS. 27 and 28 show stacking chairs with row connections and, instead of an armrest, a pivotable writing plate 170. In this chair 50.5, a fastening part 135 with V-shaped support arms 136 is provided only on the right side. At the upper ends 136.3 there are articulated elements 171 with pivot axes 172 and stops for the writing plate 170. The writing plates and their swivel mounting are designed in the usual way, but they are equipped with the inventive design of the attachment, as described for the armrests. As illustrated in FIG. 27, these writing plates 170 are also mounted in such a way that the chairs can be stacked. The stops for the writing plate are designed accordingly and the fastening elements 135 and the support arms 136 engage in the same way. Such chairs, when strung together, are always in the same shape one writing surface in a row or can also be strung together with an armrest chair and then an armrest-free chair. For this purpose, they have a bay connection element 110 with a flat pin 115 on the side that is not equipped with a pivotable writing surface, here the left side of the chair, if this is desired.

Stacking chairs, which should have armrests, as described and shown with the stacking chairs 50, expediently have an armrest exactly above the outer edge 90.1 of the foot, so that the armrest 138 lies exactly between two chairs when they are lined up and can be used optionally. An armrest must have a certain width so that it can be used to comfortably support the arms. However, it is then in the way when stacking. Thus, the armrests can also be designed to be stackable one inside the other, which is why their upwardly projecting support arms 136 are arranged in a V-shape, so that the fastening parts 135 lie between the support arms 136 of the respective lower chair.

The support arms 136.1 and 136.2 have attached bearing ends 150.1 and 150.2 which run parallel to one another at the top. These are designed with outward-facing journals 151.1 and 151.2 and, moreover, have a head design, which can be seen in the drawings, with stop faces 152.1 and 152.2 for the horizontal position and the vertical position and with a corner rounding 153 and are otherwise designed such that a base shape U- shaped or one-sided open box-shaped swivel armrest 138 it can overlap.

The pivotable armrest 138 is ribbed on the inside and is box-shaped with slightly elastic bearing legs 155. The bearing leg 155.2 has only one bearing recess 156, which corresponds to the size of the bearing journal 151.2. The end wall 157, designed to be comfortable to hold, is provided with a gap 158 for the elastic deformation of the Bearing leg 155 separated from this. The ribbing, wall thickness and other design of the pivotable armrest, which is made of a suitable plastic, is to be selected so that the bearing legs 155 can be pushed over the bearing journal 151.

At one end of the bearing 150.1 there is also a latching lug 161, which is assigned a latching recess 162 in the pivotable armrest 138, which is delimited by a latching ribbing 163. The bearing leg 155.1, as can be seen from FIGS. 36 to 38, is designed with a long recess 1'64. In this lies a highly elastic coolant part, which is designed as a lifting and pivoting bearing element 165 and is designed, for example, from a silicone rubber of approximately 50 ° shore, as can be seen from the drawings. The lifting and rotating bearing element 165 has a bearing recess 166, in which the bearing pin 151.1 rotatably engages and which is offset upwards relative to the center, so that a lower compressible part 165.1 results. Due to the overall elastic design of the bearing limbs 155 and the further highly elastic design of the lifting and pivoting bearing element 165, which fits into the slot recess 164, assembly is facilitated on the one hand and, on the other hand, a latching is made possible with the aid of the latching lug 161 and the latching recess 162, specifically in the way that the swivel arm support 138 is raised in this end region. The lower part 165.1 of the lifting and rotating bearing element then compresses itself so strongly that the bearing pin 151.1 can move relative to the pivot arm rest 138 by the height of the latching recess 162, so that the latching connection is now released and the armrest is pivoted into the vertical position shown in broken lines can be where it lies outside the support arms 136, because the axis of rotation as shown in the drawings is also arranged outside the support arms and the rest of the design is also made accordingly. Now, as can be seen from FIG. ₂₆ , another chair 50.4 with armrest 130 can be stacked over the respective lower chair with armrest, because the armrests 138 are removed from the areas of the armrest attachments and these separate between the pivoted armrests and the V-shaped parts Support arms can be inserted.

European patent application F 7. 12 EP 45 June 23, 1983 / p Reference symbol list

• 50 chair
• 50.1 - Design variants
• 50.5 of the chair
• 51 leg frame
• 52 seat
• 52.1 - recessed
• 52.4 Corner areas
• 52.5 front boundary line
• 52.6 rear boundary line
• 52.7 margin
• 52.8 margin
• 52.9 limitation
• 53 backrest
• 54 longitudinal chair axis
• 55 Connection and support part
• 55.1 Connection and support part
• 55.2 Connection and support part
• 55.3 Attachment and seat support legs
• 55.4 Seat holding part
• 55.5 transition part
• 55.6 Back support leg
• 55.7 Cylinder lugs
• 55.8 Support part
• 55.81 interior roof area
• 55.82 exterior roof area
• 55.83 fixing surface
• 55.9 Vertical leg
• 55.91 thickening part
• 57 seat width
• 58 Outer frame width
• 59 screw
• 60 attachment
• 60.1 cross
• 61 flat tube part
• 62 connector
• 63 Angular range
• 64 bend
• 65 leg
• 65.1 Pipe axis
• 65.2 Pipe end surface
• 66 corner
• 67 angles
• 68 welding point
• 70 flat tube profile
• 70.1- flat tube profile
• 70.4
• 71 major axis
• 72 thickening
• 72.1 Pitch circle or
• 72.2 Cylinder area
• 73 indentation
• 74 Point where flat tube profile is welded by longitudinal seam
• 75 center of circle
• 76 distance
• 77 radius
• 82 side wall
• 83 indentation kink
• 85 indentation
• 86.1 side wall
• 86.2 side wall
• 87 thickening
• 88 connecting wall
• 89 indentation
• 90 gliders
• 90.1 outer edge of foot
• 91 Connection and support plate
• 92 base and footprint
• 93 insertion pins
• 94 point where the connection and support plate widens in a triangular shape
• 95 stacking spigots
• 95.1 Internal recess
• 96 stack support surface
• 97 head
• 98 locking hooks
• 98.1 latch
• 99 insertion recess
• 100 insert tab
• 101 tab hole
• 102 screw
• 103 dowels
• 108 hole
• 109 mother
• 110 bay connection elements
• 111 basic body
• 112 contact surface
• 113 screw hole
• 114 screw
• 114.1 longer screw
• 115 flat pins
• 115.1 Flat cone tip
• 116 V-shaped recess
• 116.1 rounded reason
• 117 floor area
• 117.1 recess
• 118 small transverse wall
• 119 slit '
• 120 hanging collar part
• 120.1 collar
• 120.2 neck
• 125 seat cushion fold
• 130 armrest
• 131 clamping legs
• 131.1 Hole
• 132 trough
• 132.2 outer surface
• 133 outer edge
• 135 fastening part
• 136 support arms
• 136.1 support arms
• 136.2 Support arms
• 136.3 upper end
• 137 pivot bearings
• 138 swiveling armrest
• 139 latitude
• 141 splicing profile
• 142 overlap
• 150.1 End of camp
• 151 journal
• 151.1 Journal
• 151.2 Journal
• 155 bearing legs
• 155.1 bearing arm
• 155.2 Bearing legs
• 161 latch
• 162 recess
• 163 snap-in ribbing
• 164 slot recess
• 165 lifting and pivoting element
• 166 bearing recess
• 170 writing surface
• 171 joint elements
• 172 swivel axis

Claims (19)

1. Chair (50) with at least leg frame (51), seat (52) and backrest (53), in which the legs (65) are inclined to stack and in the seat (52) and backrest (53) with connecting means (55 ) are attached to the leg frame (51), characterized in that the seat width (57) corresponds approximately to the leg frame outer width (58), the seat (52) in corner areas (52.1, 52-2, 52.3, 52.4) the position and size of the Legs (65) are correspondingly excluded and the cross-sections (52.1, 52.2, 52.3, 52.4) of the seat (52) under this slender legs (65) made of metal profile have a cross-section which is in the profile (Fig. 8 to 11) is approximately dumbbell-shaped in such a way that the thickening (72) of the upper leg (65) engages in the indentation (73) of the lower leg when stacked. 2. Chair according to claim 1, characterized in that the leg frame (51) consists of two dumbbell profile flat tube parts (61), each having two bent down legs (65) and a possibly multiple bent connector (62, 63) under the Have seat (52), the two flat tube parts (61) being connected to one another under the seat and carrying the connecting means (55) for seat (52) and backrest (53). 3. Chair according to claim 2, characterized in that the two leg frame parts (61) are welded together in the region of parallel connecting pieces (62) and in each case an angled portion (63, 64) in the direction of the corner (52.1 to 52.4) of the seat (52) and an angle (66) of the leg. 4. Chair according to one of the preceding claims, characterized in that the dumbbell-shaped profile, in particular flat tube profile (70.1) of the legs (65) is composed of partial circles (Fig. 8). 5. Chair according to one of claims 1 to 3, characterized in that the dumbbell-shaped profile (70.3), in particular flat tube profile, is formed from two squares facing one another (Fig. 10). 6. Chair according to one of claims 1 to characterized in that the dumbbell-shaped profile (70.2, 70.4), in particular flat tube profile, is formed from two directly adjacent hexagons (Fig. 9) or octagons with corresponding connecting webs (Fig. 11). 7. Chair according to at least one of the preceding claims, characterized in that the legs (65) of the dumbbell-shaped tubular profile (70) have correspondingly designed sliders (90), the profile-fitting in the outer recess (73, 83, 85, 88) , to a stack support surface (96) extending stack support pin (95) which is integrally formed on the lower connection and support plate (91) of the slider (90). 8. Chair according to claim 7, characterized in that insertion pins (93) and / or stacking support pins (95) of the slider (90) have latching hooks (98) _which engage in recesses in the profile (70) of the leg (65). 9. Chair according to at least one of the preceding claims, characterized in that a plug-in tab (100) which can be screwed to the floor is provided on the slider (90). 10. Chair according to at least one of the preceding claims, characterized in that the connecting means (55) between the leg frame (51) and seat (52) slightly to the inside of the boundaries (52.9) of the beveled corner areas (52.1 to 52.4) screws arranged under the seat , Rivets or locking bolts included. 11. Chair according to at least one of the preceding claims, characterized in that a seat (52) and backrest (53) holding connecting and supporting part (55) is provided, which on both sides of the chair (50) is designed in mirror image such that a fastening and seat support leg (55.3) approximately horizontally under the seat side edges (52.7,52.8) Adjacent edges of the seat (52) run into a seat holding part (55.4) which runs obliquely inwards, adjacent to the recessed corner area (52.3, 52.4), to which a transition part (55.5) which projects obliquely to the rear and which connects into a back support leg ( 55.6) passes over, which follows the edge region of the lower part of the backrest (53) in profile and has fastening means (59) for the backrest (53). 12. Chair according to at least one of the preceding claims, characterized in that the connecting and supporting part (55) consists of die-cast aluminum. 13. Chair according to at least one of the preceding claims, characterized in that the connecting and supporting part (55) or the leg frame (51) in the region of the center of the side edges (52.7, 52.8) of the seat (52) serves as an overlapping fastening profile which, in addition to a seat support fold ( ₁₂₅ ), has a support part (55.8) which is roof-shaped in cross section, the outer surface (55.82) of which merges into a fixing surface (55.83) which extends at approximately 100 ° to 105 ° to the inclined outer surface (55.82) and merges into a vertical leg (55.9). 14. Chair according to claim 13, characterized in that an interchangeably attached armrest (130) or writing plate (170) is provided which has in the lower region a fastening profile corresponding overlap profile (141), which has a sufficient support width (139) and a central hole ( _{131. 1} ) is provided through which a single screw (114) passes, which clamps the entire armrest (130) or the holder of the writing plate (170) to the fastening profile (support part 55.8). 15. Chair according to at least one of the preceding claims, characterized in that a baying connection with a baying connecting element (110) is provided which consists of a profile part made of metal or plastic fastened in the central region of the side of the chair (50) and which is attached to a base body ( 111) has two spaced apart flat pins (115), between which a V-shaped recess (116) formed with a rounded base (116.1) remains, and preferably the bottom region (117) with recesses (117.1) for the flat pin tips (115.1) of the adjacent bay connection element (110). 16. Chair according to claim 15, characterized in that the attachment connecting element (110) with attached armrest (130) is assigned a suspension collar part (120) through which the fastening screw (114.1) of the armrest (130) extends in such a way that the collar ( 120.1) protrudes by the thickness of the flat pins (115) over the outer surface ( _{132. 1.} ) Of the fastening part (135) of the armrest (130) such that the suspension collar part (120) from above or below into the rounded V-shaped recess ( 116) of the adjacent chair (50) can be attached. 17. Chair according to at least one of the preceding claims, characterized in that the center of the armrest (130) or armrest (138) lies above the outer edge of the foot (90.1). 18. Chair according to at least one of the preceding claims, characterized in that the armrest (130) from the fastening part (135) has outwardly projecting support arms (136) which pass into pivot bearings (137) for a pivotable armrest position (138). 19. Chair according to claim 18, characterized in that the pivot bearings (137) for the pivotable armrest (138) outwardly projecting bearing journals (151.1, 151.2), on which the receiving recesses (156, 166) made of plastic, for assembly Sufficiently elastic, but sufficiently rigid swiveling armrest (138) is seated and assigned stop surfaces (152.1, 152.2) for the horizontal position and the vertical position and an engagement catch connection (160, 162, 163) in the area of one end of the armrest (138) ) is provided, which is associated with an elastic lifting bearing in such a way that the pivotable armrest (138) has an elongated slot recess (164) lying vertically in the horizontal position, in which a lifting and pivoting bearing element (165) formed from highly elastic plastic is arranged, which has a bearing bore (166) for the bearing journal (151 .1) in such a way that the somewhat larger lower part (165.1) of the lifting and pivoting element (165) is deformable for unlocking and the armrest (138) can thereby be raised.

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