EP1987738B1 - Free swinging chair - Google Patents

Abstract

The chair has a leg (5), whose upper ends are bent off below a front transverse member (7) under a diagonal angle against a back rest (3), and extend against the center of a seat plate (11). The upper ends of the chair leg are connected using bars (8) having equal diameters and made of plastics. The seat plate is connected with a rear transverse member (9) in a form stable manner, and is attached to the front transverse member in a rotatable manner.

Description

TECHNICAL AREA

The present invention relates to the field of furniture industry. It relates to a cantilever chair, which is particularly suitable for office space, according to the preamble of claim 1.

STATE OF THE ART

Cantilever chairs are known in many different versions, such as US 5 018 789 A , With them, the seat is supported by a support frame without rear chair legs so that it can yield and vibrate under load. In order to accommodate the high bending forces occurring in the support frame, it is usually designed as a metallic tube frame, which characteristically has a U-shaped foot part and two at least partially vertical, front chair legs, which are usually also interconnected by at least one cross-beam. Seat, backrest and / or armrests are demgebenüber known from various materials including plastic.

PRESENTATION OF THE INVENTION

The invention has as its object to provide a cantilever chair of the aforementioned type, wherein plastic is also partially used for the support frame. This object is achieved by a cantilever chair with the features of claim 1.

The inventive cantilever chair is therefore characterized in that the upper ends of the chair legs are bent below the front crossbeam at an oblique angle to the backrest and slightly up against extend the center of the seat plate. There they are connected with struts about the same diameter of plastic on shock, which further extend against the backrest and which are connected by a rear cross-beam also made of plastic. The seat plate is dimensionally stable, connected to the rear cross-beam and pivotally mounted on the front cross-beam.

In this embodiment, the two struts and the rear cross member can be functionally attributed to the support frame. About the dimensionally stable seat plate this part of the support frame is additionally supported on the front cross member.

Preferred embodiments of the invention are characterized in the dependent claims.

Thereafter, the struts and the rear cross member, and preferably also the seat plate and more preferably also the backrest are integrally formed.

A visually appealing design results when the backrest is not directly connected to the seat, but is attached exclusively to the two struts.

For permanent stable connection of the upper ends of the chair legs with the struts bolts, especially metal bolts can be used, which are preferably firmly embedded in the plastic material of the struts and added to the bent ends of the chair legs in a socket. The bolts are not visible from the outside.

If the struts or sockets, as is preferred in each case injection molded parts made of plastic, the insertion of the bolts in the struts or in the sockets can be provided in a conventional manner with trains and fields, with simple formability of the parts cylindrical abutment surfaces to get for the bolt.

The seat plate is also at least in one piece training with the struts and the rear cross member also made of plastic, being preferably provided on its upper side with reinforcing ribs. These are then more preferably aligned at an oblique angle relative to the seat plate and parallel to the two-sided end portions of the rear cross member between the seat and the struts, so that the struts, the rear cross member and the seat plate with the reinforcing ribs comprehensive part in injection molding production from simple the injection mold is malleable.

Particularly preferably, the backrest is also made of plastic and integral with the struts, the rear cross member and the seat plate. The cantilever chair according to the invention consists in this case only of very few parts to be joined together during its assembly and can be produced very efficiently.

For the pivotable mounting of the seat plate on the front cross-beam can be provided in it a downwardly open groove for receiving and supporting the front cross-beam, the flanks with respect to the shaping during injection molding production preferably also parallel to the two-sided end portions of the rear cross-beam between the seat plate and the struts are aligned.

For the pivotable attachment of the seat plate to the front cross-beam bracket-like fasteners can be used in which the front cross member is pivotally mounted and which are rotatably disposed in formations of the seat plate and locked in this.

The inventive cantilever chair can also be provided with armrests, which are preferably also integrally formed again at least with the struts.

BRIEF EXPLANATION OF THE FIGURES

Fig. 1

eine Seitenansicht eines Freischwingerstuhles ohne Armstützen nach der Erfindung;

Fig. 2

eine geschnittene Teildarstellung des Stuhles von Fig. 1, wobei die Schnittebene in einer der beiden Streben gewählt ist;

Fig. 3

eine geschnittene Darstellung des Stuhles von Fig. 1, wobei die Schnittebene in der Mitte der Sitzplatte gewählt ist;

Fig. 4

eine geschnittene Teildarstellung des Stuhles von Fig. 1 mit vergrösserter Detaildarstellung A, wobei die Schnittebene auf Höhe eines klammerartigen Befestigungselements für die Sitzplatte gewählt ist; und

Fig. 5

eine Seitenansicht eines Freischwingerstuhles mit Armstützen nach der Erfindung.

The invention will be explained in more detail with reference to embodiments in conjunction with the drawings. Show it:

Fig. 1

a side view of a cantilever chair without armrests according to the invention;

Fig. 2

a partial sectional view of the chair of Fig. 1 with the cutting plane selected in one of the two struts;

Fig. 3

a sectional view of the chair of Fig. 1 , wherein the cutting plane is selected in the middle of the seat plate;

Fig. 4

a partial sectional view of the chair of Fig. 1 with enlarged detail A, wherein the cutting plane is selected at the level of a bracket-like fastening element for the seat plate; and

Fig. 5

a side view of a cantilever chair with armrests according to the invention.

WAYS FOR CARRYING OUT THE INVENTION

The in Fig. 1 illustrated cantilever chair includes a metallic tube frame 1, a seat 2 and a backrest. 3

The metallic tube frame 1 has a U-shaped foot part 4, of which in Fig. 1 Only one of its two lateral legs can be seen: From the foot part 4, the tubular frame 1 continues on first approximately vertically still up in the form of two chair legs 5 whose upper end portions 6 are bent at an oblique angle to the rear against the backrest 3 out. Of the two chair legs 5 is in Fig. 1 also only one to see. In the region of their bent end portions 6, the two chair legs 5 are connected to each other via a front cross-beam 7, which also consists of metal.

The bent end portions 6 of the chair legs 5 extend only approximately to the center of the seat 2. There they are each connected with struts 8 of the same diameter on impact, of which in Fig. 1 again only one can be seen. The struts 8 extend in the same direction further to the backrest 3 and are connected to this, which forms the only connection of the backrest 3 with the other parts of the chair in the illustrated embodiment. By the backrest is designed to be relatively narrow in height and keeps a clear distance from the seat 2, results in a special, open appearance.

In their middle region, the two struts 8 are connected by a rear cross-beam 9, from which in Fig. 1 especially one of its two-sided end portions 10 can be seen. The two-sided end portions 10 branch off at about a right angle from the struts 8 obliquely downward. The rear cross-beam 9 has the overall shape of a bent down bow.

The seat 2 has a dimensionally stable seat plate 11 and a padding 12, which is constructed on a cushion support 13. The seat 2 is carried by the two transverse members 7 at the front and 9 at the rear.

According to a preferred embodiment of the invention, the seat plate 11, the backrest 3, the struts 8, as well as the rear cross-beam 9, a one-piece, by injection molding produced, inherently dimensionally stable plastic part of a fiber-reinforced plastic material, wherein it is e.g. may be PAGF30 or PAGF15.

To connect the struts 8 with the bent end portions 6 of the chair legs 5 serve, as in Fig. 2 to recognize metallic bolts 14. In the struts 8, these bolts 14 are firmly embedded, which can be achieved for example by turning the bolt 14 into corresponding recesses in the ends of the struts 8 immediately after molding from the injection mold, while the plastic is still warm is.

In the end portions 6 of the chair legs 5, the bolts 14 are received in sockets 15, which are made of plastic and in turn can be made by injection molding technology. In order to provide for the bolt 14 in these sockets 15 and in the mentioned recesses in the ends of the struts 8 cylindrical contact surfaces and the corresponding cavities during injection molding still easy to molding, the sockets and the recesses are inside with Provided trains and fields so that they have on the inside an approximately gear-shaped cross-section.

The use of metallic bolts to connect the chair legs 5 to the struts 8 is advantageous because it allows sufficient account to be taken of the different flexural and material properties of these parts and avoids critical notch stresses in the plastic material of the struts 8, e.g. would occur if end portions of the struts 8 were inserted into the chair leg ends. It is particularly advantageous if the bolts 14 have a diameter of 15 mm and a length 150 mm with an outside diameter of the chair legs 5 of 25 and a wall thickness of the chair legs of 2 mm.

As in Fig. 3 to recognize, the seat plate 11 in its front region a downwardly open groove 16 for receiving and supporting the front cross-beam 7. Thus, in the injection molding production of the seat plate 11 integral with the backrest 3, the struts 8 and the rear cross-beam 9, this groove 16 is easily formed, their flanks are parallel to the two-sided end portions 10 of the rear cross-beam 9 between the seat plate 11 and the struts eighth aligned, this orientation corresponds to the opening direction of the injection molding tool.

The seat plate 11 has a relatively thin wall thickness of only about 5 mm. So that it is sufficiently dimensionally stable reinforcing ribs 17 are present for their stiffening on their upper side, which together form a reinforcing grid. Also, these reinforcing ribs 17 are, in order to be easily formed, aligned at an oblique angle relative to the seat plate 11 parallel to the two-sided end portions 10 of the rear cross member 9.

In Fig. 3 is also the aforementioned padding carrier 13 can be seen, which carries the padding 12. The cushion support 13 is fastened by means of screws on the seat plate 11. In order to optimize the layer thickness available for the padding 12, the padding support 13 snugly fits against the seat plate 11 and for this purpose has a relief structure adapted to the grid structure of the reinforcing ribs 17 and the other formations of the seat plate 11.

For fastening the seat plate 11 to the front cross-beam 7 serve clamp-like fasteners 18 made of plastic, as in Fig. 4 and the corresponding enlargement. The fastening elements 18 are pushed with their open side on the front cross-beam 7 and clipped on and then inserted into corresponding formations 19 of the seat plate 11 and locked in rotation therewith formed on them latching lugs. Only as a backup for this locking connection is still a screw 20 is present. In the fastening elements 18, the front cross-member 7 is rotatable, so that the pivoting movements, which performs the seat 2 to the front cross-member 7 under load, are possible. From the attachment of the seat plate 11 to the front cross-beam 7 and those forces are absorbed, which exerts the seat plate 11 under load in the horizontal direction forward on the cross-beam.

Fig. 5 still shows a cantilever chair accordingly Fig. 1 , but with armrests 21. These are integrally formed on the struts 8 and extend like a bow upwards arched between the ends. Compared to the struts 8, they are offset slightly outwards so that they can easily be shaped with injection molding technology.

NAME LIST

1

metallic tube frame

2

Seat

3

backrest

4

U-shaped foot part of the tubular frame

5

chair legs

6

upper end portions 15 of the chair legs

7

front crossbeam 16

8th

pursuit

9

rear crossbeam

10

End sections of the rear crossbeam

11

seat plate

12

upholstery

13

cushion support

14

metallic bolts

15

receptacles

16

Groove in the seat plate

17

reinforcing ribs

18

fasteners

19

Moldings of the seat plate

20

locking screws

21

armrests

Claims (12)

1. Cantilever chair having a frame, a seat (11) and a backrest (3), wherein the frame comprises a tubular metal frame (1) with a base (4) and two legs (5) that are vertical in sections and linked to each other by means of a front crossbar (7), wherein the upper ends of the legs (5) are bent at an angle towards the backrest (3), and wherein the seat (11) is attached to the front crossbar (7), characterised in that the base (4) is U-shaped, and the upper ends of the legs (5) are bent below the front crossbar (7) and extend approximately to the centre of the seat (11), where they are connected edge to edge with struts (8) of approximately the same diameter made of plastic, which struts extend further towards the backrest (3) and which are connected to each other by means of a rear crossbar (9) likewise made of plastic, wherein the seat (11) is connected in a dimensionally stable manner to the rear crossbar (9) and is attached in a pivoted manner to the front crossbar (7).
2. Cantilever chair according to Claim 1, characterised in that the struts and the rear crossbar (9) are made in one piece.
3. Cantilever chair according to Claim 1, characterised in that the struts (8), the rear crossbar (9) and the seat (11) are made in one piece.
4. Cantilever chair according to Claim 1, characterised in that the struts (8), the rear crossbar (9), the seat (11) and the backrest (3) are made in one piece.
5. Cantilever chair according to one of Claims 1 to 4, characterised in that the backrest (3) is secured only to the two struts (8).
6. Cantilever chair according to one of Claims 1 to 5, characterised in that the upper bent ends of the legs (5) are each connected to the struts (8) by means of a bolt (14), preferably a metal bolt.
7. Cantilever chair according to Claim 6, characterised in that the bolts (14) are permanently embedded in the plastic material of the struts (8) and are held in the bent ends of the legs (5) in a push-in sleeve (15).
8. Cantilever chair according to Claim 7, characterised in that the push-in holes for the bolts (14) in the struts (8) and / or in the sleeves (15) are provided with grooves and lands.
9. Cantilever chair according to one of Claims 1 to 8, characterised in that the seat (11) has reinforcing ribs (17) on its upper surface, which ribs are oriented at an angle to the seat (11) and parallel to the end sections (10) at both sides of the rear crossbar (9) between the seat (11) and the struts (8).
10. Cantilever chair according to one of Claims 1 to 9, characterised in that there is, in the seat (11), a slot (16) open at the bottom to accept and hold the front crossbar (7), the sides of this slot being oriented parallel to the end sections (10) at both sides of the rear crossbar (9) between the seat (11) and the struts (8).
11. Cantilever chair according to one of Claims 1 to 7, characterised in that the front crossbar (7) is secured to the seat (11) with clamp-like mounting elements (18), the front crossbar (7) being pivoted in the mounting elements (18), and the mounting elements (18) being positioned in a non-rotatable manner in recesses (19) of the seat (11) and locked therein.
12. Cantilever chair according to one of Claims 1 to 9, characterised in that there are, on the struts (8), bracket-shaped armrests (21) that extend between the ends of same, and that are curved upwards and arranged offset outwards in relation to the struts (8), and that are made in one piece with the struts (8).

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