Modular chair

Abstract

A modular chair (1) is provided that allows a user to be supported thereon and includes at least a support portion (2), the support portion (2) including a frame (20) and a fabric (21). The fabric (21) defines a surface (210) suitable for supporting a user and a peripheral area (211) defined by the edges of the surface (210). The frame (20) defines a closed contour during use and is suitable for supporting the tensioned fabric (21) along at least a portion of the peripheral area (211), and includes two parts (200). The two parts (200) are separate and loosely connected to each other by two hinges (201) respectively located at the ends of the parts (200) so as to define an in-use configuration in which the parts (200) form the frame (20) and an unused configuration in which the parts (200) are folded together. The hinges (201) define two respective axes of rotation (2a) that are aligned with one another, and the frame (20) tensions the fabric (21) only when the part (200) is in the use configuration.

Description

[Technical field]

[0001] The present invention relates to a modular chair of the type according to the preamble of claim 1.

[0002] In particular, the present invention relates to a modular chair in the broad sense of the term, i.e. any device on which a user can sit, which, depending on its structure, may consist of a chair, an armchair, a sofa or for various types of use, including office, home, garden, luxury, etc. [Background technology]

[0003] As is known in the art, many different types of chairs are produced, such as chairs with arms, recliners, hanging ropes, or armchairs or sofas, depending on the relevant market for which the chair is intended.

[0004] Historically, the chair originated from a simple bench, which in fact was equipped with a simple support surface defining a seat structurally connected to at least two posts, elevating the seat off the ground.

[0005] Currently, chairs are generally designed to allow the support of at least one user, preferably on a flat surface called the seat. Most chairs also have additional support elements such as a backrest, and may also include armrests and supports for supporting the upper and lower limbs, respectively.

[0006] Among the wide variety of chair types there are the so-called deck chairs, consisting of a folding chaise longue whose back can be reclined to various angles, on which the user can sit or lie down depending on his wishes; the maître d's chair, also developed as a bishop's stool, which is essentially a cross or X-structure and can also fold down to support the seat; the tripolina, which is entirely folding and was historically used on the battlefield; the one-piece chair, made entirely of polymer materials and used mainly in the restaurant industry in outdoor environments; the rocking chair, which is a typical chair of concern and has two curved supports designed to allow a rocking movement; and the cantilever chair, which is very commonly used and has only two upright vents, one at ground level and one at seat level, connected horizontally by a continuous tube.

[0007] In addition to the above mentioned examples, there are several other different types and constructions of chairs, designed to meet aesthetic requirements, such as market demand for a particular shape, or technical requirements, resulting for example from the need to optimize the manufacturing process while maintaining a high quality level of the chair product.

[0008] Examples of this type are described in US Pat. Nos. 2,839,126, 5,762,403, and 6,293,624, as well as US Patent Publication No. 2010109414.

[0009] The chairs described in the above patent applications have features and configurations that allow assembly of the chair beginning with engaging elements with one another.

[0010] In particular, all chairs offer the possibility of applying fabric finishing pieces to parts of the chair frame in order to create components such as the seat and / or backrest.

[0011] In particular, all the solutions mentioned above have a perforated frame inside which the periphery of the fabric or fabric strips can be introduced so as to be hooked onto the frame. This attachment mechanism requires in particular that a slide, confined to the fabric, is inserted into a guide.

[0012] The prior art described has several significant drawbacks.

[0013] In particular, all the chairs described require very long construction times: in fact, in all cases, the frames and components are custom made and have very complicated interlocking mechanisms.

[0014] In this case, tensioning the covering fabric can be very difficult and may result in damage to the base frame or fabric. In other cases, this aspect also contributes to increasing the assembly time of the chair.

[0015] Nearly all of the described samples also have large dimensions due to the fact that all components must be prefabricated and then stored in a specific space.

[0016] It is no coincidence that a huge challenge in manufacturing chairs, or any similar piece of furniture, is the supply of the parts that make them up.

[0017] Indeed, when a chair is made of different materials from different manufacturers, coordinating procurement to assemble all the components in a short time frame, without storage space, can be complicated. [Prior art documents] [Patent documents]

[0018] [Patent Document 1] U.S. Patent No. 2,839,126 [Patent Document 2] U.S. Patent No. 5,762,403 [Patent Document 3] U.S. Patent No. 6,293,624 [Patent Document 4] US Patent Publication No. 2010109414 Summary of the Invention [Problem to be solved by the invention]

[0019] In this context, the technical object of the present invention is to devise a modular chair capable of substantially overcoming at least some of the mentioned drawbacks.

[0020] Related to this technical objective, one important goal of the present invention is to provide a modular chair that can be easily and quickly constructed.

[0021] Another important goal of the present invention is to make the modular chair easy and fast, especially with regard to the supply of the parts that make up the modular chair. [Means for solving the problem]

[0022] The technical aim and the stated objectives are achieved by a modular chair as claimed in the attached claim 1.

[0023] Preferred technical embodiments are described in the dependent claims.

[0024] The features and advantages of the present invention will become apparent from the following detailed description of the preferred embodiments, taken in conjunction with the accompanying drawings. [Brief description of the drawings]

[0025] [Figure 1] FIG. 2 is a front view of a chair according to the present invention. [Diagram 2] FIG. 2 is an exploded view of a chair according to the present invention. [Diagram 3] FIG. 2 is a detailed view of the tether and support of the chair according to the invention. [Figure 4] FIG. 2 is a schematic perspective view of the frame of the chair according to the present invention; [Figure 5a] FIG. 2 is a detailed view of the hinge mechanism of the frame of the chair according to the invention in an unused or pre-assembled configuration. [Figure 5b] FIG. 2 is a detailed view of the hinge mechanism of the frame of the chair according to the invention in an in-use or assembled configuration. [Figure 6] FIG. 2 is a cross-sectional view of the frame of a chair according to the present invention with a guide portion. [Figure 7] FIG. 2 is a detailed view of a hinge for a chair according to the invention. [Figure 8] 1 is a schematic diagram of an example of introducing a fabric slider into a frame guide in a chair according to the present invention; FIG. [Figure 9a] FIG. 1 is a cross-sectional view of a frame of a chair according to the present invention with two pieces of fabric connected to the frame at a single guide. [Figure 9b] FIG. 2 is a cross-sectional view of a frame of a chair according to the present invention, with two guides, a fabric, and a connecting device, the fabric and the connecting device each being connected to the frame by a special guide. [Figure 10] FIG. 2 is a front view of a chair according to the present invention, including a fabric covering the bottom of the support portion. [Figure 11] FIG. 2 is a front view of a chair according to the invention, including a connecting device at the bottom of the support part and the support part, in an office embodiment. [Figure 12] FIG. 2 is a front view of a chair according to the invention in an alternative embodiment, covered with fabric. [Figure 13a] FIG. 3 is a detailed side view of a chair according to the present invention in the preferred embodiment shown in FIGS. 1-2. [Figure 13b] FIG. 11 is a detailed side view of a chair according to the present invention in the alternative embodiment shown in FIGS. 9a and 10. [Figure 13c] FIG. 12 is a detailed side view of a chair according to the present invention in the alternative embodiment shown in FIGS. 9b and 11. [Figure 14a]FIG. 1 is a side view of a chair according to the present invention in an alternative embodiment in which the parts are separate and distinct when the chair is in an unused or unrelated configuration for use and configured to be assembled together by a machine. [Figure 14b] FIG. 14b is a side view of the chair of FIG. 14a with the parts arranged relative to one another in an unused or assembled configuration so as to define a hinge. [Figure 14c] FIG. 14b is a side view of the chair of FIGS. 14a-b with fabric set into the parts. [Figure 14d] FIG. 14A is a side view of the chair of FIGS. 14a-14c with the parts arranged in an in-use configuration and forming a frame by stretching the configured fabric. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0026] In this specification, when references to measurements, values, shapes, and configurations (such as perpendicular and parallel) are associated with "about" or similar terms such as "generally" or "substantially," they are understood to be other than measurement errors or inaccuracies due to manufacturing and / or production tolerances, and especially other than slight deviations from the referenced associated value, measurement, shape, or configuration. For example, when associated with values, these terms preferably represent deviations of 10% or less of the value.

[0027] Additionally, terms used such as "first," "second," "upper," "lower," "primary," and "secondary" do not necessarily denote an order, priority, or relative position, but may simply be used to distinguish more clearly distinct components from one another.

[0028] Measurements and data presented herein are taken from the International Standard Atmosphere ICAO (ISO 2355:1975) unless otherwise stated.

[0029] Referring to the drawings, reference number 1 generally denotes a modular chair according to the present invention.

[0030] The modular chair 1 is preferably a chair, but can be any device on which a user can sit and which, depending on the configuration, can also be configured by devices other than a chair, such as an armchair or a sofa.

[0031] For example, the chair 1 may be a seat for a vehicle or other conveyance such as a train or an airplane.

[0032] In addition, regardless of the particular use and design, the chair 1 can be suitably adapted for a variety of uses, such as home use, office use, or other environments than those mentioned.

[0033] The chair 1 preferably comprises at least a support part 2 .

[0034] The support part 2 is preferably suitable for a user to rest on, and is therefore substantially a part of the chair 1 on which at least a part of the user's body can rest.

[0035] Preferably, the support portion 2 comprises a frame 20 and a fabric 21 .

[0036] The fabric 21 may be defined only by a fibrous sheet or may also include a stuffing element, for example trapped between two strips of fabric.

[0037] Preferably, in either case, the fabric 21 defines a surface 210 and a peripheral region 211 .

[0038] Surface 210 is preferably suitable for supporting a user. Thus, surface 210 preferably defines a support surface for a user and is suitable for supporting the weight of a user.

[0039] Instead, peripheral region 211 is substantially defined by an edge of surface 210. In other words, peripheral region 211 is substantially defined by a border area of ​​surface 210.

[0040] Preferably, the fabric 21 comprises bicomponent fibers, i.e. polymer filaments around which the fabric filaments are twisted. This type of fiber reinforces the fabric or, more generally, makes it possible to vary at will the local mechanical properties of the fabric 21. The term "local properties" allows the surface 210 to be considered as a set of smaller surfaces, each defining its own mechanical properties, which can therefore be varied from surface to surface.

[0041] In fact, the morphology of the fabric 21 can be realized by studies and treatments, for example by finite element theory or other types of methods that allow discretizing the surface and controlling the local mechanical properties of the discretized elements.

[0042] Preferably, the fabric 21 is made by an automatic knitting machine, particularly a machine known as a flat knitting machine.

[0043] Using these machines, it is possible to control the mechanical properties of the individual elements of the surface 210 so as to make it possible to obtain the desired characteristics of the fabric 21 according to the structural elements with which it interacts in the chair 1, as already mentioned.

[0044] The fabric 21 can also be made using conventional looms.

[0045] In this case, for example, the fabric 21 may exhibit different mechanical properties within the surface 210 depending on, for example, the thread count or the texture selected within the fabric 21 .

[0046] The fabric 21 may also include localized support elements, either made with computational or traditional textile techniques. For example, the fabric 21 may include metal structures, such as bars or filaments, trapped inside pockets or woven into it. Metal structures can easily be made into the fabric 21 to locally increase the stiffness of the surface 210. In this case, the fabric 21 may appear as a woven surface 210, including, for example, ribs or diaphragms, such as metal, suitable for reinforcing the structure of the fabric 21.

[0047] Preferably, the frame 20 defines a closed structure in use, i.e. when assembled, such that the frame 20 extends along a curved trajectory so as to close on itself and, in the case of a ring, form a hole.

[0048] The frame 20 does not necessarily have to have a flat structure, but preferably has a complex structure extending three-dimensionally in space, as particularly shown in FIGS.

[0049] This type of complex structure is a composite 3D curve, i.e. a curve created along a path that rotates around at least two principal axes in three-dimensional space.

[0050] Preferably, the frame 20 defines a use condition or assembled configuration in which it creates a closed structure, and an unused condition or pre-assembled configuration in which it assumes a different shape.

[0051] In its in-use or assembled configuration, the frame 20 is adapted to support the fabric 21 under tension, preferably corresponding to at least a portion of the peripheral region 211 .

[0052] The fabric 21 may in fact be completely connected to the frame 20 along its peripheral region 211, or may be only partially connected along the peripheral region 211 of the fabric 21, for example when defining a chair 1 including a partially draped fabric 21, as shown in FIG. 12.

[0053] This last measure may also be appropriate if the chair 1 is made with different fabrics 21. In fact, the chair 1 may comprise a fabric 21 partly connected to the frame 20 in the peripheral area and a fabric 21 partly connected to other fabrics to make the support part 2.

[0054] In particular, the frame 20 locally tensions the fabric 21 in relation to the shape provided by the frame 20 .

[0055] Alternatively, in the unused condition or pre-assembled configuration, the frame 20 may release the fabric 21 .

[0056] To achieve this, the frame 20 preferably, but not necessarily, comprises at least two parts 200.

[0057] The parts 200 are part of the frame 20 and may substantially coincide with the cross section of the closed structure defined by the frame 20. Preferably, the parts 200 are separate from each other and loosely connected to each other at two fastening points. Alternatively, they may be single-piece parts defining loosening points between the parts 200, in the latter case allowing to identify the individual parts 200, the fastening points corresponding to the loosening points. Preferably, these fastening points correspond to the end points of the parts 200, but other points, for example intermediate, may be provided so as to form a ring shape with irregular edges.

[0058] Preferably, the parts 200 are loosely connected to each other by two hinges 201 .

[0059] Hinge 201 is preferably a means for allowing frame 20 to be switched between an in-use (assembled) or an unused (pre-assembled) condition or configuration.

[0060] These hinges 201 are preferably mechanical.

[0061] In particular, preferably, hinge 201 defines an in-use or assembled configuration, where parts 200 actually form frame 20, and an unused or pre-assembled configuration, where parts 200 are reciprocally folded together.

[0062] In this way, the overall size of the support surface 2 is reduced when the part 200 or frame 20 is in the unused or pre-assembled configuration.

[0063] Thus, the hinge 201 may connect the parts 200 in any configuration, for example in an embodiment suitable to enable assembly of the chair 1 by an end user or user.

[0064] Alternatively, hinge 201 can be broadly interpreted as a connector suitable for connecting components 200 in each configuration, effectively connecting components 200 at least in a solely used configuration, or in both a solely unused configuration and a used configuration.

[0065] In this sense, in an embodiment in which the chair 1 is made industrially using a special machine, the parts 200 can be separate and distinct from one another without being in the use configuration, each of them being provided with a projection or pin, preferably at a fixing point corresponding to the end of the part 200, and configured to provide the hinge 201 at least in the unused and in the use configuration when they are brought together, for example by said machine. In this case, the projection essentially defines a support suitable for defining a rotation point at the fixing point. As a result, in this form, the hinge 201 can be provided, for example only in a step immediately prior to the definition of the use or unused configuration.

[0066] In other words, parts 200 define at least one configuration prior to these in an assembly step that is unrelated to the unused and used configurations, where parts 200 are not in contact, while hinge 201 created by placing parts 200 in contact at their ends defines an unstable unused configuration and a removable connection that is stabilized only when parts 200 provide frame 20 in the used configuration, for example.

[0067] In any case, preferably each of the hinges 201 defines an axis of rotation 2a. The axis of rotation 2a is preferably located along a sagittal plane, which divides the closed structure into two substantially identical parts. In use, the sagittal plane suitably encompasses the vertical direction.

[0068] The axis of rotation 2a preferably defines the only degree of freedom given to the part 200 of the frame 20. In principle, the part 200 is therefore preferably suitable for rotating exclusively about the axis of rotation 2a of the hinge 201.

[0069] Suitably, the rotation axes 2a of the two hinges 201 are aligned with each other, so that the frame 20 can be substantially closed or folded in an unused or pre-assembled configuration and reopened by identifying at least one use or post-assembly configuration, which corresponds to a stable equilibrium configuration in which the frame 20 holds the fabric 21 taut.

[0070] In particular, frame 20 tensions fabric 21 only when part 200 is in the use configuration.

[0071] In order to provide a use configuration, i.e. an assembled configuration, or a stable balanced configuration, the chair 1 according to the invention is preferably configured such that the parts 200 can rotate relative to one another in only one direction. In particular, the possible mutual rotation is preferably against the ground so that the frame 20 can counteract possible forces and weights placed on the support part 2 or the weight of a user.

[0072] The term counter-rotated relative to the ground means that when the frame 20 is opened like a book, it faces the ground in the same way that the pages of a book face the ground once opened.

[0073] Thus, the chair 1 preferably provides a particular configuration of hinges 201 in the first embodiment example.

[0074] Specifically, as shown in Figures 5a, 5b and 7, each of the hinges 201 includes an interference portion 201a.

[0075] The interfering portions 201a preferably only interfere with one another when the parts 200 bring the frame 20 into the use configuration, and are oriented such that when a user is resting on the support surface 210, the interfering portions 201a provide an interfering force proportional to the weight of the user.

[0076] In other words, the interference portion 201a may be a shoulder suitable for butting when the frame 20 is in use and the part 200 is placed in a stable equilibrium position. The interference force may be a connection reaction that interacts between the interference portions 201a facing each other.

[0077] Suitably, part 200 achieves a stable equilibrium position by means of an interference portion 201a.

[0078] In a more complex configuration, the hinge 201 may not be a mechanical hinge, such as a household door hinge, but may be a hinge 201 suitable for allowing loosening of the part 200 by elastic deformation.

[0079] In this regard, part 200 may be part of a closed single piece, as already mentioned, and suitable for folding at a specific fixed slack point. In applications such as those present in bearingless systems, the permitted movement of the hinge may be replaced by material deformation instead of a mechanical connection.

[0080] Additionally, hinge 201 may also envisage suitable locking means for locking parts 200 together when in an in-use or post-assembly configuration to ensure that parts 200 continue to maintain tension on fabric 21.

[0081] Alternatively, hinge 201 may include a resilient element, such as a spring, to maintain part 200 in an in-use or assembled configuration without the application of stress. In the latter case, a locking device may be configured to lock part 200, and thus the frame, in an unused or pre-assembled configuration.

[0082] Or alternatively, the interfering portion 201a itself can be provided with a locking means. For example, the locking means can include a pressure-lockable elastic mechanism suitable for preventing rotation about the hinge 201 as soon as the interfering portion 201a is impacted. In addition, this mechanism can allow the release of the part 200 and the release of the hinge 201 when pressed again. An example of this type can be a locking mechanism with a spring press.

[0083] Fabric 21 is connected to frame 20, as described above, preferably along at least a portion of its peripheral region 211.

[0084] In particular, the frame 20 preferably defines a guide portion 202 .

[0085] The guide 202 is preferably a hollow, continuous guide along at least each of the components 200. In particular, the guide 202 is preferably in the form of a track through which an element, such as a rigid element, conforming to the dimensions of the guide 202 can pass.

[0086] Examples of this type are described, for example, in US Pat. No. 2,839,126, first paragraph, lines 62-72 and second paragraph, lines 1-12, which are incorporated herein by reference.

[0087] Indeed, guide 202 may also include access holes allowing objects to be inserted into guide 202. These holes may for example be located at predefined points on frame 20, such as at fixed points on the ends of part 200. Preferably, the access holes are located in the upper region of frame 20 relative to the ground, so that objects can be inserted from top to bottom, as shown in Fig. 8. Preferably, the access holes face the ground, in use, i.e. in the assembled configuration, to be hidden from a user looking at chair 1.

[0088] The fabric 21 preferably includes at least one slider 212 .

[0089] The slider 212 may be defined by a reinforced portion of the fabric 21, or by a portion of the fabric 21 that has a greater thickness and / or density. Alternatively, the slider 212 may be defined by an element attached to the fabric 21 at its exterior.

[0090] Preferably, in either case, the slider 212 is disposed along the peripheral region 211 and is suitable for insertion into the interior of the guide portion 202 .

[0091] Therefore, preferably, the guide portion 202 is suitable for allowing the slider 212 to slide therein. In particular, the guide portion 202 is configured to confine at least a portion of the slider 212 for winding the fabric 21 and the frame 20 together.

[0092] Thus, the slider 212 may be made continuous along the peripheral region 211 of the fabric 21 , or the fabric 21 may be provided with a plurality of continuous sliders 212 .

[0093] Preferably, the frame 20 is substantially bellows-shaped relative to the fabric 21, inside which the fabric can be positioned by sliding the slider 212 with the guide 202. A similar mechanism is also described in U.S. Pat. No. 6,293,624, third paragraph, lines 26-52, which is incorporated herein by reference.

[0094] Preferably, however, the guide portion 202 is only accessible from the bottom of the chair 1, ie from the ground, and the fabric 21 is attached to the frame 20 so as to wrap around at least a part of the frame 20.

[0095] In this way, not only is the connection between the frame 20 and the fabric 21 hidden from the user, but in addition the frame 20 itself is covered with the fabric 21, and by wrapping the fabric 21 around the frame 20 tension is further ensured.

[0096] The parts 200 may be different or may be identical and mirror each other with respect to the axis of rotation 2a.

[0097] This last example is particularly preferred, since it optimizes the production of the part 200. The part 200 is in fact made of aluminium, preferably by three-dimensional extrusion. Of course, the part 200 can be made of a polymeric material, also by extrusion, for example, or of other materials that allow the creation of hollow, continuous profiles with non-coplanar extension paths. In another type of embodiment, the part 200, and thus the frame 20, can be made using a composite structure. A composite structure comprises a metal core covered with a different material, for example a polymeric material, and is made by techniques such as polymer injection moulding on the metal core.

[0098] The non-flush embodiment leaves behind unnecessary elements but is preferred for making the chair 1, especially with regard to the comfort it provides.

[0099] In addition to the supporting part 2 the chair 1 also comprises a load-bearing part 3 .

[0100] The load-bearing portion 3 is preferably designed to support a support portion 2 that is suspended and permanently off the ground. For example, a typical load-bearing portion 3 included in a conventional chair is made up of four or fewer support legs.

[0101] Alternatively, but not necessarily, the load-bearing part 3 is preferably made of a tubular structure which can be connected to the support part 2. More generally, the load-bearing part 3 comprises attachment means 30.

[0102] The attachment means 30 are preferably suitable for releasably and stably connecting the support part 2 and the load-bearing part 3 .

[0103] These attachment means 30 are preferably interlocking connections suitable for connecting the parts 2 , 3 at predetermined fixing points to make up the chair 1 .

[0104] More specifically, the frame 20 includes a protrusion 22 .

[0105] The projections 22 preferably protrude towards the ground. The projections 22 are, for example, cylindrical elements that protrude from the frame 20 to interact with other external components.

[0106] These projections 22 are then preferably in turn connected to the frame 20 by known constraints, such as nails, bolts, or other types of connections. Alternatively, the projections 22 can be made directly into the frame 20.

[0107] Thus, the protrusions 22 may be made of a metal or, preferably, a polymeric material. For example, the protrusions 22 may be made using injection molding techniques.

[0108] The attachment means 30 is suitably configured to interact with the protrusion 213. In particular, the attachment means 30 preferably comprises a hole 31. The hole 31 is structurally configured to receive the protrusion 22 so as to permanently block the support part 2 on the load-bearing part 3. In particular, the chair 1 is preferably configured such that the weight of the support part 2 and of a possible user resting thereon ensures that the support part 2 and the load-bearing part 3 remain connected to each other and permanently locked.

[0109] The load-bearing part 3 as mentioned above does not necessarily define a structure as described above, but may also include conventional configurations, for example cantilevered, four-legged or other configurations, provided that it includes suitable attachment means 30 to allow the connection of the support part 2 and the load-bearing part 3. In an alternative configuration of the chair 1, the parts 200 may each comprise two guides 202, as shown in Fig. 9b. In this case, for example, the chair 1 may be configured to confine two different fabrics 21, one of which may be used to make the support part 2 and the other to cover the bottom of the chair, as clearly shown in Figs. 10 and 13b. The second guide 202 may also allow the connection of a connection device 5 by interlocking, as shown in Figs. 9b and 13c.

[0110] The coupling device 5 can be a body provided at the bottom of the support part 2 in relation to the ground, for example, to support the bottom, through the connection of the second guide part 202, hiding part of the bottom of the chair 1 and allowing the support part 2 to be connected to any type of load-bearing part 3. In fact, the coupling device 5, for example when made of a metal or polymer structure, can have its own rigidity to allow the connection of the support part 2 with a load-bearing part 3, such as the wheel support of a typical office chair as shown in Fig. 11.

[0111] As a result, the connecting device 5 can have an inverse shape relative to the lower part of the frame 20, in particular with an inverse edge relative to the second guide 202 and with respect to the final shape of the surface 210 of the fabric 21 in the support part 2. Naturally, the connecting device 5 can include an articulation mechanism of the support part 2 as known in the art. This type of mechanism is known for example as synchro-tilt.

[0112] The chair 1 preferably additionally comprises tethers 4 .

[0113] The tether 4 is part of the load-bearing part 3 and may be integrated inside it or may be an external element.

[0114] Preferably, the tethers 4 are configured to tension the support surface 210 along predefined fixed points, such that the fabric 21 defines at least two or more specific regions. Preferably, when stretched, the fabric 21 defines a backrest 21a and a seat 21b.

[0115] The seat 21a is preferably arranged adjacent to the support portion 3, while the backrest 21a is spaced away from the support portion 3 and is suitable for supporting the user's back. In particular, the tethers 4 are capable of applying a large tension to the seat 21a. The seat 21a thus comprises a support surface 210 which is, for example, more taut than the backrest.

[0116] The tether 4 preferably comprises a tubular element 40 .

[0117] The tubular element 40 can thus be hollow or solid. Preferably, the tubular element 40 is U-shaped or C-shaped and is suitable for applying tension to the support surface 210 along its extension.

[0118] The support surface 210 may thus be positioned between the tether 4 and the ground, such that the tether 4 tensions the fabric 21 directly towards the ground.

[0119] Preferably, the support surface 210 includes a pocket 210a.

[0120] The pocket 210a is preferably configured to receive at least a portion of the tubular element 40. In this way, the tubular element 40, when subjected to movement, moves a portion of the fabric 21 with it.

[0121] Further, depending on the shape of the pocket 210a, the fabric 21 is also tensioned along the attachment point of the tubular element 40 to the pocket 210a, or, if the pocket 210a completely covers the tubular element 40, the fabric 21 is tensioned along the entire extent of the tubular element 40.

[0122] In this configuration, as shown in FIG. 2, preferably the tubular element 40 is positioned below the fabric 21 relative to the ground and inside a pocket 210a made in the fabric.

[0123] In addition, the load-bearing portion 3 may include a second protrusion 32 .

[0124] Second protrusion 32 is preferably of the same type as protrusion 22 and serves substantially the same function.

[0125] Indeed, preferably, the second projections 32 are housed inside the tubular element 40, which is thus configured to house them.

[0126] In addition, the load-bearing part 3 includes a connection means 33 .

[0127] The connecting means 33 is preferably configured to lock the tubular element 40 in place towards the ground, where the tether 4 subjects the support surface 210 to continuous tension.

[0128] Suitably, the connection means 33 is a substantially interlocking means suitable for capturing at least a portion of the tether 4 so as to continuously act as described to keep the tether 4 permanently positioned in place.

[0129] In particular, the tethers 4 may also define a curvature or concavity towards the ground, which may in fact facilitate an interlock between the connection means 33 that maximizes the stability provided by the tethers 4, exerting a force consistent with the locking direction of the connection means 33 once the user sits on the support portion 2.

[0130] The support part 2, in particular the seat 21b and the backrest 21a, is mainly realized by the ties 4. However, the configuration of the frame 20 and the fabric 21 also contributes significantly to the technical aspects of the support part 2, for example by the different stiffness that the fabric 21 may have and partly by the shape of the frame 20.

[0131] As described, the production technique of the fabric 21 on a mechanical knitting machine allows the density and morphology of the fabric 21 to be locally controlled.

[0132] In addition, the shape of the frame 20 can, and preferably does, allow the fabric 21 to be subjected to differential tension along its perimeter regions 211 .

[0133] In particular, the frame 20 preferably has a three-dimensional eight-shape, the portion reserved for the seat 21b being wider than the portion reserved for the backrest 21a.

[0134] A priori, the fabric 21 is thus made more taut in the areas reserved for the seat 21b, so that it is possible to synergistically combine the technical possibilities offered by the fabric 21, the frame 20 and the ties 4 to define a controlled support surface 210 in each sector.

[0135] For example, the seat 21b has a greater stiffness, and therefore a lower deformability, than the backrest 21a.

[0136] The above-mentioned behavior of the chair 1 with respect to structure is substantially defined by its construction procedure, which is explained below.

[0137] The present invention therefore includes a new method of making the chair 1.

[0138] This procedure consists of several successive steps, making it possible to make the chair 1 from the individual parts, but the most important step is the tensioning step. Indeed, during the tensioning step, the parts 200 are preferably rotated relative to one another about the axis of rotation 2a so as to create the frame 20 and to tension the fabric 21.

[0139] This tensioning step is innovative in that the supporting portion 2 is made without any difficulties and ensures correct tensioning of the supporting portion 2 to make the chair 1.

[0140] In addition, the tensioning step can be preceded by a setting step in which the fabric 21 is connected to the frame 20. In particular, the sliding part 212 of the surface 210 is preferably inserted inside the guide part 202 of the part, for example via a special cut at the end of the part 200, and the fabric 21 is then connected to the frame 20 in its peripheral area 211.

[0141] As mentioned above, in a preferred embodiment, for example where the manufacture of the chair 1 is carried out by special industrial machinery, the tensioning step may be preceded by an assembly step.

[0142] In an assembly step, preferably the parts 200 are juxtaposed and placed in contact at the aforementioned fastening points corresponding to the ends of the parts 200 to provide hinge 201 when not in a separate and distinct use configuration. For example, in this step the parts are placed in contact to define an unused configuration.

[0143] Once the hinge 201 has been defined by connecting assembly means such as protrusions, e.g. hooks or pins, which enable the points of mutual rotation of the parts 200 to be defined, a tensioning step can be carried out.

[0144] The interlocking assembly means described above are simple mechanical elements that are well known in the art and function substantially as shown in Figures 14a-14d.

[0145] Apart from the steps mentioned above, the process may include other related steps which may supplement or replace the previous steps.

[0146] For example, a preferred manufacturing process for chair 1 may include the support portion 2 being defined in a tensioning step and possibly a setting step.

[0147] Alternatively, the manufacturing process may include a support portion 2 including an original frame 20 and fabric 21 suitably interconnected to the tensioned fabric 21 .

[0148] The procedure may include a connection step, in which the load-bearing part 3 and the support part 2 are connected to each other.

[0149] In particular, and preferably, the connecting step consists of inserting the projection 22 into the hole 31 of the attachment means 30 .

[0150] In addition, the process may advantageously further comprise a shaping step in which ties 4 are connected to the support portion 2 and the load-bearing portion 3, tensioning the surface 210.

[0151] More specifically, preferably the tubular element 40 of the tether 4 is inserted inside the pocket 210a made in the surface 210 and then connected by inserting the second projection 32 inside the end of the tubular element 40.

[0152] Once the tether 4 is fastened to both parts 2, 3, it is preferably juxtaposed against the ground and locked by the connection means 33. The connection means 33 maintains the tubular element 40, and therefore the tether 4, in a position where the fabric 21 is tensioned at a predetermined point.

[0153] As a result, shaping the chair 1 enables the backrest 21a and the seat 21b of the chair 1 to be defined.

[0154] The chair 1 of the present invention achieves important advantages.

[0155] Indeed, the chair 1 is easily assembled or assembled since each of the construction steps is highly simplified. In particular, the tensioning step tensions the fabric 21 on the frame 20 in a controlled manner by a mechanical or elastic mechanism.

[0156] Adding other elements such as load bearing sections 3 and ties 4 is also very easy and not difficult for the user.

[0157] As a result of these advantages, a further advantage offered by chair 1 is that the components can be supplied quickly if chair 1 is sold in a single order.

[0158] The easy fabrication of the various components, using the techniques described, i.e. synthetic fibers, mechanical knitting, 3D controlled extrusion, allows each of the components to be realised in a short time, reducing inventory holding costs, e.g. relating to managing warehouses, and up-front risks associated with mass production.

[0159] In addition, a further advantage is that the defined and constructed chair 1 has great aesthetic value, the connection between the fabric 21 and the frame 20 is hidden and the shaping is carried out in a completely controlled manner. If the possible addition of a second guide 202 inside the frame 20 is taken into account, it is also possible to cover the supporting part 2 facing the ground as well as the elements connecting the supporting part 2 and the load-bearing part 3.

[0160] In particular, the possibility of locally controlling the fabric 21 makes it possible to create a chair 1 that is both comfortable and robust, with the advantageous technical and aesthetic features already described.

[0161] The easy assembly and disassembly of the chair 1 also has a significant effect on the maintenance and recycling aspects of the chair 1 or its parts: in fact, in case of damage or for aesthetic reasons, the upholstery 21 as well as other elements of the chair 1 can be quickly and easily replaced.

[0162] Compatibility, combined with speed of supply, is a fundamental factor for chairs used in environments such as catering or offices, and in general working environments.

[0163] The possibility of dismantling the various parts of the chair 1 and separating the different materials allows for a proper preparation of the materials for recycling and ensures good ecological disposal of the chair 1.

[0164] Modifications may be made to the invention described herein without departing from the scope of the inventive concept as defined in the claims.

[0165] For example, the system connecting the fabric 21 and the frame 20 may be different and provide a non-removable connection between the two. In addition, the guide 202 may be suitable to accommodate several adjacent slides 212 as shown in Fig. 9a, whereby the frame 20 may be operatively connected and joined to a plurality of fabrics 21, e.g., stacked.

[0166] In this respect, all details may be replaced with equivalent elements and materials. Shapes and dimensions may be as desired.

Claims

1. A modular chair (1), The seat includes at least one support portion (2) that allows a user to sit and includes a frame (20) and a fabric (21); a load-bearing part (3) separate from the at least one support part, the load-bearing part (3) supporting the at least one support part (2) suspended in air and stably separated from the ground, and removably and stably connected to the at least one support part (2); The fabric (21) defines a surface (210) for supporting the user and a peripheral area (211) defined by an edge of the surface (210); said frame (20) defining a closed contour in use and supporting said fabric (21) in tension along at least a portion of said peripheral region (211); The modular chair (1) comprises: said frame (20) comprises at least two parts (200) which are connected to each other while maintaining one mutual degree of freedom by two hinges (201) respectively arranged at the ends of said parts (200) so as to define a use configuration in which said parts (200) make up said frame (20) and an unused configuration in which said parts (200) are folded together; said hinge (201) defining two respective rotation axes (2a) directly aligned with one another; said frame (20) is arranged to tension said fabric (21), tension being achieved only when said part (200) is released as a result of an opening movement of said two parts that passes said frame (2) from said unused configuration to said used configuration; A modular chair (1) featuring:

2. 2. The modular chair (1) according to claim 1, wherein said frame (20) defines a complex structure defined by curves made along trajectories rotating in three-dimensional space around at least two main axes.

3. 3. The modular chair (1) according to claim 1 or 2, wherein each of the hinges (201) comprises an interference portion (201a) which only interferes when the parts (200) are oriented such that, when the frame (20) is in a use configuration and the user is seated on a support surface (210), the interference portions (201a) provide an interference force to each other which is proportional to the weight of the user, the interference portions (201a) being shoulders which come into contact when the frame (20) is in use and the parts (200) are in a stable equilibrium position, the interference force being a connection reaction in which the interference portions (201a) facing each other also interact with each other.

4. The modular chair (1) according to any one of claims 1 to 3, wherein the frame (20) defines at least one guide portion (202), the guide portion (202) being hollow and continuous at least along each of the parts (200), and the fabric (21) comprises at least one slide portion (212), the slide portion (212) being arranged along the peripheral area (211) and inserted inside the guide portion (202), the guide portion (202) being configured to confine at least a portion of the slide portion (212) to connect the fabric (21) and the frame (20) to each other.

5. The modular chair (1) according to claim 4, wherein when the parts (200) are in a use configuration, the guide portion (202) opens downwardly along each of the parts (200) and the fabric (21) is connected to the frame (20) so as to wrap at least a portion of the frame (20).

6. Modular chair (1) according to any one of the preceding claims, wherein said parts (200) are identical to each other and mirror-imaged with respect to said axis of rotation (2a).

7. The modular chair (1) according to any one of claims 1 to 6, wherein the load-bearing part (3) comprises attachment means (30) enabling a detachable and stable connection of the support part (2) and the load-bearing part (3).

8. 8. The modular chair (1) according to claim 7, wherein the frame (20) includes a protrusion (22) protruding towards the ground, and the attachment means (30) defines a hole (31) structurally configured to receive the protrusion (22) so as to stably block the support part (2) to the load-bearing part (3).

9. A modular chair (1) according to any one of claims 1 to 8, comprising tethers (4) configured to tension a support surface (210) along predefined fixed points so that the fabric (21) defines at least one backrest (21a) and one seat (21b), the seat (21b) comprising a support surface (210) that is subject to greater tension than the backrest (21a).

10. 10. The modular chair (1) of claim 9, wherein the tether (4) comprises a U-shaped tubular element (40), the support surface (210) comprises a pocket (210a) configured to accommodate at least a portion of the tubular element (40), the support portion (3) comprises at least two second projections (32) and connection means (33), the tubular element (40) configured to receive each end of the second projections (32), the connection means (33) configured to lock the tubular element (40) in a predetermined position towards the ground, and the tether (4) subjects the support surface (210) to a continuous tension.

11. The modular chair (1) according to any one of claims 1 to 10, wherein the parts (200) are separate and separate from each other when not in the unused configuration and when not in the used configuration, and include protrusions or pins configured to define the hinges (201) that interconnect the parts (200) in the used configuration when the parts (200) are in contact at least in the unused configuration.

12. A method for making a modular chair (1), comprising the steps of: The seat includes at least one support portion (2) that allows a user to sit and includes a frame (20) and a fabric (21); a load-bearing part (3) separate from the at least one support part, the load-bearing part (3) supporting the at least one support part (2) suspended in air and stably separated from the ground, and removably and stably connected to the at least one support part (2); The fabric (21) defines a surface (210) for supporting the user and a peripheral area (211) defined by an edge of the surface (210); said frame (20) defines a closed contour and supports said fabric (21) under tension in said peripheral area (211), and comprises at least two parts (200) which are connected to each other while maintaining one mutual degree of freedom by two hinges (201) respectively arranged at the ends of said parts (200) defining two axes of rotation (2a) directly aligned with each other so that said parts (200) define a use configuration making said frame (20) and an unused configuration in which said parts (200) are folded together, The method comprises: at least one tensioning step in which the parts (200) are rotated relative to one another about the axis of rotation (2a) to create the frame (20) and tension the fabric (21); The method of claim 1, wherein tension is achieved only when the parts (200) are opened as a result of an opening movement of the two parts that passes the frame (2) from the unused configuration to the used configuration.

13. 12. A method for making a modular chair (1) according to claim 11, comprising, prior to the tensioning step, an assembly step in which the parts (200) are separated and separate when not in the unused and used configurations, juxtaposed and arranged in contact at the ends of the parts (200) to create the hinges (201).

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