WO2005120292A1

WO2005120292A1 - Seat

Info

Publication number: WO2005120292A1
Application number: PCT/CH2004/000359
Authority: WO
Inventors: Egon Bräuning
Original assignee: Vitra Patente Ag
Priority date: 2004-06-14
Filing date: 2004-06-14
Publication date: 2005-12-22
Also published as: CN1968626A; US20090121534A1; EP1758485A1

Abstract

The invention relates to a seat consisting of a single-component body (1) comprising an essentially horizontally arranged seat element (11), an upwardly projecting backrest (12) applied to the rear of the seat element (11), and two front legs (10,10') extending at the front of the seat (11). The two separated rear legs (2') are to be inserted and fixed in the body (1), said legs being provided with a non-rotationally symmetrical insertion part (22'). An externally accessible opening for positively inserting the insertion parts (22') is provided on the body (1), respectively laterally in the region of the rear seat end (110). Said insertion parts (22') and openings are provided with an enlarged surface in relation to the core diameters thereof. The insertion part (22') is embodied as an insertion tenon (22') extending from the rear leg (2') and having an essentially elliptical cross-section which conically tapers off in the direction of the free end. The openings oriented towards the sides of the seat have an elliptical cross-section which is complementary to the insertion tenons (22') and enlarges towards the entrance of the openings. The insertion tenons (22') comprise a circular peripheral outer toothing (220') that extends preferably in the axial direction of the insertion tenons (22') and openings. The inner surface of said openings is provided with an inner toothing that complements the outer toothing (220') of the insertion tenons (22').

Description

chair

Field of application of the invention

The present invention relates to a chair consisting of a one-piece torso and attached hind legs. The torso comprises a seat, which is in principle horizontally arranged, the backrest attached to the rear end of the seat, and the front legs which bend downwards in the corner regions of the front end of the seat and extend to the floor. The chair can be equipped with or without armrests. In particular, the invention is concerned with improving the stability of the generic chair construction.

State of the art

From the international design registration DM / 022 613 a chair of the type mentioned at the outset is known, where a leg frame under the torso is screwed to a one-piece torso - with a seat, a backrest and front legs. On the central part of the leg frame connecting the rear legs, a holding plate is arranged, which is used for screwing under the seat. Separate, curved armrests are screwed onto the back of the backrest and under the seat. This construction requires considerable material and assembly effort in the manufacture. DE 202 19 476 U1 shows a chair with a one-piece torso which comprises a horizontally arranged seat which merges into an upwardly projecting backrest at the rear. The front legs extend from the seat towards the floor. Below the torso, in its side areas, there is a plug-in receptacle accessible from the back of the chair for inserting an extension on the rear leg.

Object of the invention

Based on the previously known prior art, the object of the invention is to propose a chair of the type defined at the outset with improved strength. The chair should be efficient in series with Have as little assembly effort as possible and be provided with and without armrests.

Summary of the Invention The essential component of the chair is a one-piece torso that includes

- A seat arranged in principle horizontally;

- an upward-facing backrest, attached to the rear of the seat;

- front legs extending from the seat to the floor; and - hind legs inserted into the torso and extending to the floor.

Each hind leg is a separate component and is provided with a non-rotationally symmetrical insert. On the torso there is an externally accessible opening on the side, in the area of the rear seat end, for the form-fitting insertion of the plug-in parts. The plug-in parts and openings are provided with an enlarged surface in relation to their core diameters.

The following features relate to special designs of the invention: The insertion part is designed as an insertion pin extending from the rear leg with an essentially elliptical cross section, the cross section of the insertion pin tapering conically in the direction of the free end. The openings have a cross-section which is complementary to the plug-in pins, in principle elliptical, and which widens as the openings enter. The openings point to the sides of the chair. The insertion pins have on their outer surface a circular circumferential toothing, which preferably extends in the axial direction of the insertion pins and openings. The openings have on their inner surface an inner toothing complementary to the outer toothing of the insertion pins.

A hind leg consists of:

- an elongated leg support;

- An arch socket attached to the upper end of the leg rest; and - the connected to the elbow, in the inserted state in Principle of horizontally arranged insertion pins.

In the chair version with armrests, the rear leg merges into an armrest. Such a hind leg includes

- A connecting part designed as an extension of the legrest and attached to the upper end of the legrest with its lower end; and

- An armrest lower part attached to the upper end of the connecting part and in principle in the state of the inserted rear leg arranged horizontally. A separate upper armrest part is provided, which is attached to the lower armrest part.

The seat is bowl-shaped and has an upstanding lateral wall edge at its lateral boundaries. There is an upstanding rear wall edge at its rear boundary. The lateral wall edges each merge into the rear wall edge in a preferably arcuate transition area. At the rear end, on the upward-facing side of the seat, housing-like connecting parts are arranged in the corner areas, which enclose the openings, which in principle extend parallel to the rear wall edge. The connection parts are bounded by a rear wall in the direction of the seat interior. The openings preferably open into the transition areas between the lateral wall edges and the rear wall edge. A screw hole accessible from the outside is provided in the rear wall. The insertion pins have a cavity on the inside, and a bulge arranged longitudinally to the axis of the insertion pin extends from the inner surface of the cavity. A blind hole with an internal thread is provided in the bulge, the blind hole, when plugged in, covering the screw hole in the rear wall of the connecting part.

The chair has a rib grid arranged at the front end of the seat, on its upward-facing side. This grid initially includes, in principle, arranged parallel to the front boundary of the seat, spaced-apart longitudinal ribs which protrude with a forward tendency. Furthermore, the grid consists of transverse ribs arranged transversely to the longitudinal ribs and spaced apart from one another and projecting from the seat.

The sandwich-like cushion consists of:

- A foam to be foamed onto the seat, expanding between the side wall edges, reaching forward over the rib grid and bordering the rear wall edge to the rear, which, when foamed, between the longitudinal ribs and

First gaps formed by transverse ribs flow;

- A basically arranged parallel to the lower film and to the latter in principle congruent upper film, which in the rear corner areas each has a contour lying in the air gap between the connecting parts and seat, in which the connecting parts (are embedded; and

- An upholstery foam mass introduced between the lower film and the upper film.

The seat has an opening at the rear end and the backrest includes:

- Two towering vertical brackets, which start with lower ends in the corner areas at the rear end of the seat; - A crossbar connecting the two vertical brackets at their upper ends;

- A back cover to be pulled over the two vertical brackets and the crossbar; and

- Tension bars that extend beyond the opening on the upward-facing side of the seat and in a hem at the bottom

End of the back cover are threaded. Brief description of the attached drawings

Show it:

Figure 1A - a chair according to the invention with rear legs of the first variant, ie without armrests, in front view; Figure 1B - the chair according to Figure 1A, in side view; Figure 1 C - the chair according to Figure 1 A, in an exploded view;

Figure 2A - a chair according to the invention with hind legs second

Variant, ie with armrests, in front view; Figure 2B - the chair according to Figure 2A, in side view;

Figure 2C - the chair according to Figure 2A, in an exploded view;

FIG. 3A - a rear leg of the first variant, that is to say without an armrest, in a perspective view; Figure 3B - the hind leg according to Figure 3A, in a different perspective;

Figure 4A - a rear leg of the second variant, ie with armrest, in perspective view;

Figure 4B - the hind leg according to Figure 4A, in a different perspective; Figure 4C - the enlarged detail X2 of Figure 4B, in partial section;

Figure 4D - a vertical section through Figure 4C, along the insertion pin; Figure 4E - a vertical section through Figure 4C, transverse to the insertion pin;

Figure 5A - the docking area as an enlarged detail X1 from Figure 1C, in vertical partial section;

Figure 5B - a vertical section through Figure 2C, transverse to the connector; Figure 5C - the enlarged detail X3 of Figure 5B with the inwardly extending conical narrowing;

FIG. 6A - a rear leg of the second variant, that is to say with an armrest, in partial section, approximating the docking area according to FIG. 5A; Figure 6B - the rear leg according to Figure 6A in the docked state;

Figure 7A - a rear leg of the second variant with a separate upper armrest part, in a perspective top view; Figure 7B - the armrest upper part of Figure 7A, in the view from below; Figure 7C - an armrest upper part filled with foam;

Figure 8A - a vertical longitudinal section through the armrest of Figure 6A; Figure 8B - the enlarged detail X4 of Figure 8A;

Figure 9A - an inventive chair with hind legs second

Variant, i.e. with armrests, in a partial section;

Figure 9B - the chair according to Figure 9A with seat cover; Figure 9C - the enlarged detail X5 from Figure 9A;

Figure 9D - the enlarged detail X6 from Figure 9A;

Figure 9E - the enlarged detail X7 from Figure 9B; and

Figure 9F - the enlarged detail X8 from Figure 9B.

Working Example

The detailed description of an exemplary embodiment of the chair according to the invention is given below with the aid of the accompanying drawings.

The following definition applies to the entire further description. If reference numerals are included in a figure for the sake of clarity in the drawing, but are not explained in the directly associated description text, reference is made to their mention in the previous description of the figures. In the interest of clarity, the repeated designation of components in the following figures is mostly dispensed with, provided that it can be clearly seen in the drawing that the components are "recurring".

Figures 1A to 1C

The torso 1 comprises the horizontally arranged seat 11, the backrest 12 attached to the rear end 110 of the seat 11 with its vertical brackets 120, 120 ′, and the front legs which bend downwards in the corner regions of the front end 111 of the seat 11 and extend to the floor 10,10 '. The backrest 12 has an ergonomic shape, which results from the course of the vertical brackets 120, 120 ', which initially extend steeply upward from its lower end 121, 121', then in Merge the arc into a linear section inclined to the rear and bend again at the upper ends 122, 122 'in the arc to the rear. At the top, a cross bracket 123 connects the two vertical brackets 120, 120 ".

The chair has a mirror-image structure with respect to its longitudinal axis, so that the left rear leg 2 'of the first variant shown in this sequence of figures both in the assembled and in the removed state from the torso 1 is mirror-symmetrical to the right rear leg 2 of the first variant, which is only shown in the docked state. The leg supports 20, 20 'tapering downward toward their lower ends 200, 200' merge at the upper end into the arch supports 21, 21 ', at which the plug-in pins 22, 22' form an obtuse angle with the leg supports 20, 20 ' educating, starting. The outer surfaces of the insertion pins 22, 22 'are provided with an external toothing 220, 220'. The seat 11 has two upwardly projecting lateral wall edges 112, 112 '. At the rear, the seat 11 is delimited by an upwardly projecting rear wall edge 113, the side wall edges 112, 112 'merging into the rear wall edge 113 in an arcuate transition region 114, 114', so that the seat 11 is given a shell-like shape.

The two connection parts 14, 14 'are arranged in the corner regions at the rear end 110 of the seat 11, where the lateral wall edges 112, 112' meet the rear wall edge 113. The rear legs 2, 2 'are docked to the torso 1 in a form-fitting manner by inserting the insertion pins 22, 22' into the openings 141 of the connection parts 14, 14 'and then fastening the insertion pins 22, 22' to the connection part 14, 14 'by means of screws 19. At the front end 110 of the seat 11 there is a rib grid 13 which consists of longitudinal ribs 130 running between the lateral wall edges 112, 112 'and transverse ribs 131 arranged perpendicular to the latter. The rib grid 13 serves for fastening and anchoring a cushion 5 and also for reinforcing the seat 11.

A further stabilization of the seat 11 is achieved by attaching a reinforcing insert 16, for example a sheet metal, which is placed on the rib grid 13 placed parallel to its longitudinal ribs 130, and fastened to it by means of screws 19. The seat 11, which is stabilized in this way twice, also withstands high loads without sagging. An opening 150 extends below a channel 15. To fasten the back cover 4 drawn over the backrest 12, tensioning strips 40 are threaded into the hem 41 at the lower end of the back cover 4, then passed through the opening 150 from below and thus fastened to the channel 15, that both ends protrude from the channel and extend beyond the opening 150. For height leveling, the lower ends 100, 100 'of the front legs 10, 10' are provided with front sliders 102 and the lower ends 200, 200 'of the rear legs 2.2' are provided with rear sliders 202. To protect the footprint, the side of the front slider 102 facing the floor is lined with a front felt piece 103 and the side of the rear slider 202 facing the floor is lined with a rear felt piece 203.

Figures 2A to 2C

The chair shown here differs from the chair previously shown in FIGS. 1A to 1C only by a different design of the rear legs 2, 2 '. The hind legs 2, 2 'of the first and second variants are described in detail in the following FIGS. 3A to 4E.

Figures 3A to 4E

Both the rear legs 2.2 'first variant and the rear legs 2.2' second

Variants each include a leg support 20, 20 ', an arch connection 21, 21' and an insertion pin 22, 22 '. The leg supports 20, 20 'extend upward from their lower end 200, 200'. At the upper end 201, 201 'of the leg supports 20, 20', the arch connector 21, 21 'connects. The cross section of the leg supports 20, 20 'has the shape of a rectangle with strongly rounded corners, the width of the surfaces of the leg supports 20, 20' running parallel to the side boundaries of the seat 11 in the assembled state continuously increasing upwards, while the width of the surfaces of the leg supports 20, 20 'pointing forwards and backwards remain constant over their axial extent. The leg supports 20, 20 'go in at an obtuse angle at the upper end 201, 201' the elbow 22.22 'over, the cross section of which gradually flattens out to finally have an elliptical shape at the transition from the elbow 21, 21' to the plug 22.22 ".

The arch connection 22, 22 'protrudes from the leg supports 20, 20' at an obtuse angle. The insertion pin 22, 22 ', which is attached to the elbow connector 21, 21', has an elliptical cross-section which tapers conically towards the free end. The outer surface of the insertion pins 22, 22 'is provided with a circular circumferential external toothing 220, 220' which extends from the longitudinal to the The axes of the insertion pins 22, 22 'arranged at a distance from one another exist, so that the cross-section of the outer toothing 220, 220' results in a wavy cross section. To save weight, the insertion pin 22, 22 'has an interior cavity 221 which extends from the end face 224 of the plug-in pin 22, 22 'extends beyond its axial extent and extends into the arch connection piece 21, 21'. Inside the cavity 221, an elongated bulge 222 of oval cross-section extends from the inner surface of its inner surface and runs parallel to the longitudinal axis of the plug-in pin 22, 22 '. in which there is a blind hole 223 accessible from the front side 224 of the insertion pin 22, 22 ′.

The rear legs 2, 2 'of the second variant are expanded compared to the rear legs 2, 2' of the first variant by a connecting part 23, 23 ^* , which as a straight line continuation of the leg supports 20, 20 'with its lower end 230, 230' at the upper end 201, 201 'of the leg supports 20.20 '. At the upper end 231 of the connecting parts 23, 23 ', at right angles to the latter, the lower armrest parts 24, 24' adjoin, which are arranged horizontally in the state of the rear legs 2, 2 '. The upper armrest parts 3, 3 'consist of an upper longitudinal section 30, 30' which runs parallel to the side seat boundaries in the assembled state and which bends at the rear at an obtuse angle into an upper transverse section 31, 31 '. The armrest lower parts 24, 24 'comprise a lower longitudinal section 240, 240' which is congruent to the upper longitudinal section 30, 30 'and a lower transverse section 241, 241' which is congruent with the upper transverse section 31.31. Figures 5A to 6B

The two connection parts 14, 14 'which rest on the seat 11 and which adjoin the rear wall edge 113 are identical in construction. They have the shape of a round housing with an opening 141 that is accessible from the side and an outer contour that has an elliptical cross section that narrows eccentrically towards the rear wall edge 113. The openings 141 open below the vertical brackets 120, 120 'into the arcuate transition regions 114, 114' between the side wall edges 112, 112 'and the rear wall edge 113. Inward, the openings 141 are each delimited by a rear wall 142, in which a screw hole 143 is provided. The elliptical cross sections of the openings 141 taper conically to the rear wall 142 and correspond to the cross sections of the insertion pins 22, 22 ". The inner surface of the opening 141 is provided with an internal toothing 140, 140 ', which is complementary to the outer toothing 220, 220" of the insertion pin 22, 22 ^{* is} trained.

When a rear leg 2, 2 'is docked on the torso 1 (see FIGS. 6A and 6B), the insertion pin 22' is first inserted into the opening 141 of the connecting part 14 '. Here, the outer toothing 220 'of the insertion pin 22' and the inner toothing 140 'of the connecting part 14' interlock, whereby the insertion pin 22 'is positively secured against rotation. The mutual toothings 220 ', 140' bring about a considerable enlargement of the surface and thus a large force distribution in order to control the torques acting on the plastic parts. At the same time, the blind hole 223 in the bulge 222 inside the plug-in pin 22 'coincides with the screw hole 143 in the rear wall of the connecting part 14'. Next, a screw 19 is passed through the screw hole 143 to fasten the insertion pin 22 ′, which engages behind it in the internal thread of the blind hole 223.

Figures 7A to 8B

In order to save weight and to cool down more quickly during production using the injection molding process, the lower part of the armrest 24 has a shell-shaped design. det. So that it still has sufficient stability, lower ribs 242 are provided on the inside for reinforcement. The upper armrest part 3, also of shell-like shape, is reinforced with upper ribs 32, which form the second spaces 37 between them. The upper armrest part 3 is filled with a foam material 36, which penetrates into the second intermediate spaces 37 when foaming, and is thus divided into units evenly distributed within the upper armrest part 3. The foam mass 36 flows into the recesses 35 during foaming and thus receives a fixation on the upper armrest part 3 after solidification. In the lower armrest part 24 there are two upstanding pins 243 and in the upper armrest part 3 there are pin holes 34 corresponding to the pin 243 in two housing-like plug nests 33. For fastening, the upper armrest part 3, 3 'is placed on the lower armrest part 24, 24', the pins 243 penetrating into the pin holes 34 and being held therein by a barbed locking element 39. So that the pin holes 34 remain free when the foam material 36 is foamed, a cover 38 is placed on the housing 33.

Figures 9A to 9F

The cushion 5 is constructed like a sandwich. The cushion foam mass 52 is joined between an upper film 51 and a lower film 50. The lower film 50 has a perforation 500 running around the edge and the upper film 51 has an upper perforation 510 running around the edge. When foaming, the upholstery foam mass 52 flows into the lower and upper perforations 500, 510 in order to obtain an attachment to the lower and upper film 50, 51 after solidification. A contour 501 which is complementary to the connecting parts 14, 14 'is formed in the surface of the rear corners of the upper film 51 which are adjacent to the connecting parts 14, 14' when the cushion 5 is inserted. The connection parts 14, 14 'project towards the rear wall edge 113, somewhat from the seat 11, so that a gap remains between the seat 11 and the end parts 14, 14'. The corner regions of the upper film 51 are pushed into this gap until the connecting parts 14, 14 'with their lower sections are embedded in the contour 501 of the upper film 51. The lower film 50 is foamed onto the seat and flows into the longitudinal and transverse ribs 130, 131 formed first spaces 132. In the hardened state, the lower film 50 is secured by the longitudinal ribs 130, which protrude from the seat 11 with a slight forward tendency, against displacement in both the rearward horizontal and vertical directions, while the transverse ribs 131 block the lower film 50 against lateral displacement.

Claims

claims

I. Chair comprising: a) a one-piece torso (1) comprising: aa) a seat (11) which is in principle arranged horizontally; ab) an upwardly projecting backrest (12) which is attached to the rear of the seat (11); ac) at the front of the seat (11) extending to the bottom of front legs (10,1O ^1); and b) rear legs (2, 2 ') inserted into the torso (1) and extending to the floor, characterized in that c) each rear leg (2, 2') is present as a separate component and has a non-rotationally symmetrical insertion part (22, 22 ') is provided; d) on the torso (11), in each case laterally, in the region of the rear seat end (110), there is an externally accessible opening (141) for the form-fitting insertion of the insert parts (22, 22); and e) the plug-in parts (22, 22 ") and openings (141) are provided with an enlarged surface in relation to their core diameters.

2. Chair according to claim 1, characterized in that a) the plug-in part (22, 22 ') is designed as a plug-in pin (22, 22') extending from the rear leg (2.2 ^* ) with a basically elliptical cross-section, whereby the cross-section of the plug-in pin (22, 22 ") tapers conically towards the free end; b) the openings (141) have a cross section which is complementary to the plug-in pin (22, 22") and is in principle elliptical, - expanding (141); and c) the openings (141) face the sides of the chair.

3. Chair according to at least one of claims 1 and 2, characterized in that a) the insertion pins (22, 22 ') have on their outer surface a circular circumferential external toothing (220, 220 "), which preferably extends in the axial direction of the insertion pins (22, 22 ") and openings (141); and b) the openings (141) have on their inner surface an internal toothing (140, 140 ") complementary to the outer toothing (220, 220") of the insertion pins (22, 22 ').

4. Chair according to at least one of claims 1 to 3, characterized in that a rear leg (2.2 ") consists of: a) an elongated leg support (20, 20 ');' b) one at the upper end (201, 201 ') the leg support (20, 20 ") attached to the arch support (21, 21 '); and c) the plug-in spigot (22, 22 ') which adjoins the elbow connector (21, 21') and is in principle horizontally arranged in the inserted state.

5. Chair according to at least one of claims 1 to 4, characterized in that the rear leg (2,2 ') merges upwards into an armrest (24,3).

6. Chair according to at least one of claims 1 to 5, characterized in that a rear leg (2, 2 ') comprises: a) an extension of the leg support (20, 20') formed at the upper end (201, 201 ') of the leg support (20, 20 ') with its lower end (230, 230 ") connecting part (23, 23'); b) an attached to the upper end (231, 231") of the connecting part (23, 23 "), in the state of the inserted rear leg (2nd , 2 ") in principle horizontally arranged lower armrest part (24, 24 '); wherein c) a separate upper armrest part (3.3 ^* ) is provided, which is attached to the lower armrest part (24.24 ").

7. Chair according to at least one of claims 1 to 6, characterized in that the seat (11) is shell-shaped and for this purpose: a) at its lateral boundaries each have an upstanding lateral

Has wall edge (112, 112 "); and b) has an upstanding rear wall edge (113) at its rear boundary; c) the lateral wall edges (112, 112 ') each merge into the rear wall edge (113) in a preferably arcuate transition region (114, 114 ").

5 8. Chair according to at least one of claims 1 to 7, characterized in that a) at the rear end (110) on the upward-facing side of the seat (11) in the corner areas housing-like connecting parts (14, 14 ') are arranged, which surround the openings (141), which in principle extend parallel to the rear wall edge (113); b) the connecting parts (14, 14 ") are delimited in the direction of the interior of the seat by a rear wall (142); c) the openings (141) preferably into the transition areas (114) between the side wall edges (112, 112") and the rear wall 5 end of the manure (113); d) a screw hole (143) accessible from the outside is provided in the rear wall (142). e) the insertion pins (22, 22 ") have a cavity (221) on the inside; f) a bulge (223), which is arranged longitudinally to the axis of the insertion pin (22, 22"), protrudes from the inner surface of the cavity (221); and g) a blind hole (223) with an internal thread is provided in the bulge (223), the blind hole (123) in the inserted state with the screw hole (143) in the rear wall (142) of the connecting part (14, 14 ") Cover comes 5

9. Chair according to at least one of claims 1 to 8, characterized in that the chair comprises: a) a at the front end (111) of the seat (11), on its upward-facing side rib grid (13); comprising: 0 aa) in principle parallel to the front boundary of the seat (11) spaced-apart longitudinal ribs (130) which protrude with a forward tendency; ab) transverse ribs (131) which are spaced apart from one another and project from the seat (11) and are arranged transversely to the longitudinal ribs (130); b) a sandwich-like upholstery consisting of: ba) a foam to be foamed onto the seat (11), expanding between the lateral wall edges (112, 112 '), reaching forward over the rib grid (13) and backwards to the rear wall edge (13) bordering lower film (50), which flows during foaming into first intermediate spaces (132) formed between longitudinal ribs (130) and transverse ribs (131); bb) an upper film (51), which is arranged in principle parallel to the lower film (50) and is congruent with the latter, which in the rear corner areas has a contour in the air gap between connecting parts (14, 14 ') and seat (11) , in which the connecting parts (14, 14 ') are embedded; and bc) a cushion foam mass (52) introduced between the lower film (50) and upper film (51).

10. Chair according to at least one of claims 1 to 9, characterized in that the seat (11) has an opening (150) at the rear end, and the backrest (12) comprises: a) two towering vertical brackets (120, 120 ') which start with lower ends (121, 121 ') in the corner areas at the rear end (110) of the seat (11); b) a cross bar (123) connecting the two vertical bars (120, 120 ") at their upper ends (121, 121 ^* ); c) a back cover (4) to be pulled over the two vertical bars (120, 120 ') and the cross bar (123); and d ) Tensioning strips (40) which extend beyond the opening (150) on the upward-facing side of the seat (11) and which are threaded into a hem (41) at the lower end of the back cover (4).