WO2012041343A1

WO2012041343A1 - Chair to be assembled

Info

Publication number: WO2012041343A1
Application number: PCT/EP2010/005967
Authority: WO
Inventors: Riccardo Tomat; Franco Tomat
Original assignee: Tomat Sedie S.R.L.
Priority date: 2010-09-30
Filing date: 2010-09-30
Publication date: 2012-04-05

Abstract

Mountable/demountable wooden frame chair (21), of the type comprising a first couple of legs (16) forming a substantially "C" shaped first part of the frame, a second couple of legs (17) forming a substantially "C" shaped second part of the frame, an applicable seat (19), connection means with a head coupling between first part of the frame and second part of the frame, in correspondence with each head coupling end at least one couple of insertion holes (10, 11) being provided for a corresponding pin (22), at least four tie-rods (1) consisting of a "T" shaped male component (2) and a "T" shaped female component (3) connecting with each other by means of a screwing tension bush, in which the connection means between the first part of the frame and second part of the frame are an "H" shaped intermediate connection interposed between and coupling with the first and the second part of the frame, couples of slots (24) being provided which are placed on sides (31) which are at least approximately reciprocally orthogonal sides (31) of said frame.

Description

DESCRIPTION

CHAIR TO BE ASSEMBLED

Technical field

The present invention relates to a chair to be assembled consisting of at least three frames which are joinable in a detachable way according to the characteristics of the part pre-characterizing claim 1.

Prior art

In the present state of the art chairs to be assembled are known which in general consist of two frames which are joinable in a detachable way, as for example front legs frame and rear legs frame which extends upwards with the back, or laterally opposite side frames in which the back can be a separate element which can be in turn joined to the frames. The jointing systems use squares, pins or dowels shrouded in the wooden uprights or cross-pieces and tie screw means for the clamping.

EP0712594 in the name of Buiani Gianfranco discloses a system for the assembly and clamping of seats which can be dismantled which comprise a first element and a second element connected to each other by crossbeams including terminal tenons cooperating with containing mortises, in which the system for the assembly and clamping comprises at least one tensioning means the ends of which cooperate with anchorage means included in coordinated positions in the respective opposed faces of such first element or second element.

WO 00/54630, in the name of the same applicant of the present invention, discloses a chair to be assembled in two opposite frames joinable in a detachable way, in which each of the two opposite frames has at least one intermediate crossbeam at the seating height in which at least two spaced transversal notches are provided having dimensions suitable to housing a metal plate with a threaded hole. The crossbeams are internally and transversaily holed in correspondence of the plate hole axis. A bearing seating frame is provided with at least two opposite sides with transversal holes coinciding with the previous ones. In said coinciding holes, at least four threaded screws are provided for clamping the opposite frames with the bearing seating frame, by screwing said screws from the inside on said metal plates.

WO 2005/051131 , in the name of the same applicant of the present invention, discloses a chair having a mountable/demountable frame made of wood, of the type comprising two front legs, two rear legs which extend upwards to form also a back supporting structure, four crossbeams under the seat which transversely engage, by their heads in an angular head engagement, within the legs to form a bearing frame under the seat. The crossbeams have two internal vertical transverse opposite holes near the angular head engagement and corresponding internal receding slots transversely and horizontally penetrating beyond the holes. Four tie-rods are provided made up of two semi-tie-rods which are connected among them by a tension buckle for screwing. The opposed ends of the tie-rods are provided with holes in which pins are inserted by means of the holes of the crossbeams of the frame under the seat with a contemporary insertion of the tie-rods in the holes.

Problems of the prior art

The solution disclosed in EP0712594 having tie-rod elements which are located on opposite sides of the frame constituting the chair, involves such tie-rods to extend for the whole width or alternatively for the whole depth of the chair itself, constituting heavy and bulky elements, and also expensive with respect to the usual hardware elements. Moreover the obtained assembly is however complex due to the great number of elements to be joined together with each other to form the frame of the chair itself. Moreover the presence of the tie-rods extending for the whole width or alternatively for the whole depth of the chair itself within the housing in which the seat of the chair itself is inserted, can constitute encumbrance elements which can hinder the application of the seat, which could require particular expedients to provide insertion housings suitable to avoid interferences with the tie-rods themselves. Moreover, the tie-rods exert their action only in one direction, making however possible detachments due to the use and to the reduction of the retaining effect of the glues used on the other sides of the frame itself which are affected by no pulling effect by the tie-rods themselves. On the contrary, an excessive pulling applied by the tie-rods can even cause the deformation of the frame itself above all at the sides on which the same tie-rods operate, with consequent breakage of the tie-rods or of their insertion and blocking seats on the frame or also the breakage of the elements of the frame itself.

The solution disclosed in WO 00/54630, in the name of the same applicant of the present invention, though providing a simple assembly system presents the disadvantage of requiring the presence of a high number of parts forming the frame of the chair because it requires the presence of two opposed frames and in addiction a bearing seating frame which constitutes the connection between the two opposed frames themselves and which is fixed to them by a device comprising a threaded bar, a plate and a clamping bolt. The solution is moreover expensive because it requires the manufacture of many pieces, relative reciprocal connecting means, as well as the manufacture of the housings for the tie-rods, that is insertion housings of the screwing plate, insertion housings of the threaded bar, countersink housings to accommodate the clamping bolt of the tie-rod. Moreover due to the presence of a high number of parts forming the overall frame of the chair itself, also the weight of the resulting chair will be great. Moreover the application of the threaded bar on the corresponding plate can be extremely difficult because, once the plate has been inserted in the respective housing, it is necessary to insert the threaded bar in a hole and, from the outside, acting on the protruding end of the head of the threaded bar itself, to screw it until reaching an engagement condition of the screw thread. Due to the fact that the head of the threaded bar is little protruding with respect to the insertion hole it is extremely difficult to be able to screw the threaded bar on the plate in a steady way. This can moreover involve the risk that a sure and complete clamping is not obtained, thus not being able to obtain a stable structure, excessive clearances being possibly present which due to the use could also lead to a detachment of the components. Also the application of the clamping bolt can be difficult because once the threaded bar has been correctly screwed on the corresponding plate, the head of the threaded bar will protrude still less with respect to the amount it was protruding prior to fixing it on the small plate, making it difficult both to apply the bolt and to clamp it.

WO 2005/051131 , in the name of the same applicant of the present invention, though solving some of the problems of the previously described solutions, it also presents many problems. First of all the assembly phase of the components of the tie-rods occurs during the assembly phase of the chair itself, this involving objective difficulties for the person who must carry out the operation. Indeed it is necessary to insert one of the insertion heads of the tie-rod internally to the slot obtained on the frame of the chair and successively, maintaining it in position, it is necessary to proceed with the insertion of the blocking pin through the seat obtained on the frame of the chair itself until it is inserted in the hole obtained on the tie-rod itself to block the tie-rod in position. In this phase it can be difficult to reciprocally align the insertion seat of the pin on the frame, the hole obtained on the tie-rod and the pin which is inserted at the same time. An additional disadvantage is due to the fact that at the moment of screwing the tie-rod the structure of the frame of the chair tends to get warped with the consequence that the reciprocal couplings of the different elements constituting the frame itself must be made in a very precise way and, therefore with higher costs or, alternatively or in combination with this solution, the seat which is fixed on the frame must form itself a bearing element in order to allow to maintain the correct shape of the frame of the chair itself, with evident consequent limitations both technical and aesthetical as well as problems relative to the lasting of the assembly and of stability of the obtained chair. An additional disadvantage, which is common to all of the described solutions, consists in the fact that the user who makes the assembly cannot know when to stop the screwing action of the tie-rod. As a result, the user might not put the tie-rod sufficiently in traction, with a consequent poor stability of the assembled chair. Or the user might put the tie-rod excessively in traction, with a consequent risk to damage the insertion seat of the tie-rod itself, to cause the formation of cracks in the material the chairs are made of, thus creating weak zones of the structure which could lead to breakings, or to cause bendings of the frame itself with a consequent assembly difficulty, poor stability of the chair. Or the user might put some of the tie-rods excessively in traction and he might not put other tie-rods sufficiently in traction creating zones with a greater stress and zones with a lower stress, deformations of the structure, possible loosening of some of the tie-rods.

Aim of the invention

The aim of the present invention is to provide a chair which ensures an effective minimum encumbrance of the packing when the chair is dismounted for the shipping. A further aim of the present invention is to provide an assembly solution of the components of the chair which is particularly fast. Moreover one wishes to provide a simple assembly solution which also allows a user, which is a non-expert user in the assembly of furniture, to autonomously perform the assembly of the chair itself.

Moreover a further aim of the present invention is to provide a solution which also allows to easily dismount the chair to make its transportation easy, to make its storing easy and also to favor the disposal of the different materials at the end of the life cycle of the chair itself.

A further aim is to provide a chair with enhanced characteristics of security and strength of the overall structure. A further aim is to increase the life of the chair itself. Finally a further aim is to allow to easily recover possible deformations of the frame or possible loosening of the fastening devices which could occur in the course of time and due to the use of the chair.

Concept of the invention

The aim is reached with the characteristics of the main claim. The dependent claims represent advantageous solutions.

Advantageous effects of the invention

The solution according to the present invention has many advantages, by the considerable creative contribution whose effect represents an immediate and significant technical improvement.

There are advantages from the environmental point of view because having at disposal a chair made with an easy dismounting structure allows to easily and rapidly separate the different materials which form it for their recovery and/or disposal. Advantageously, moreover, the solution according to the present invention allows to obtain a chair which is particularly compact when it is dismounted in its constituent elements, ensuring a minimum encumbrance of the packing for the shipping. The reduction of the volumes of the packages in turn involves further benefits from the environmental point of view because the volumes of the materials to be disposed are reduced and, as a result, also the costs of the packing material itself and, as a result, also the overall costs of the finished product. Also the storage of the chair is particularly facilitated because the overall total volume reduction of the packing allows to store a greater number of chairs in the same space. At the same time the assembly of the components of the chair is particularly fast and simple also allowing a non-expert user to autonomously perform the assembly of the chair itself with consequent benefits also from the economical point of view because the chair can be supplied in a dismounted condition without the corresponding assembly costs being debited to the end user or to a possible dealer. Finally the solution according to the present invention allows to obtain a chair with high security and strength characteristics of the overall structure, increasing the life cycle of the chair itself and allowing also to easily recover possible deformations which could occur in the course of time due to the use of the chair.

Description of the drawings

A practical embodiment is described hereafter with reference to the included drawings to be considered as a non-limitative example of the present invention in which:

Fig. 1 represents an exploded three-dimensional view of the tie-rod used in the chair made according to the present invention.

Fig. 2 represents a three-dimensional view of an assembly phase of the tie-rod used in the chair made according to the present invention. Fig. 3 represents a three-dimensional view showing the male and female components constituting the tie-rod used in the chair made according to the present invention.

Fig. 4 represents a three-dimensional view showing the reciprocal coupling phase of the male and female components constituting the tie-rod used in the chair made according to the present invention.

Fig. 5 represents a three-dimensional view showing the end reciprocal coupling of the male and female components constituting the tie-rod used in the chair made according to the present invention.

Fig. 6 represents an exploded three-dimensional view of an embodiment of the chair made according to the present invention.

Fig. 7 represents a three-dimensional view showing the reciprocal coupling phase of the elements forming the chair made according to the present invention.

Fig. 8 represents a three-dimensional view showing a detail of the reciprocal coupling phase of the elements forming the chair made according to the present invention.

Fig. 9 represents a three-dimensional view showing the reciprocal coupling of the elements represented in figure 8 and forming the chair made according to the present invention.

Fig. 10 represents a three-dimensional view showing the reciprocal coupling of the elements forming the chair made according to the present invention.

Fig. 11 represents an assembled three-dimensional view of a different embodiment of the chair made according to the present invention.

Fig. 12 represents an assembled three-dimensional view of a different embodiment of the chair made according to the present invention.

Fig. 13 represents a three-dimensional view of a different embodiment of the insertion seat of the tie-rods of the chair made according to the present invention.

Fig. 14 represents a three-dimensional partially exploded view showing a different embodiment of the male and of the female components constituting the tie-rod used in the chair made according to the present invention. Description of the invention

The chair according to the present invention is characterised by the presence (Figs. 1 , 2, 3, 4, 5) of a tie-rod (1) consisting of a male component (2) and a female component (3), each of which constitutes a substantially "T" shaped component.

The male component (2) is composed of a cylindrically shaped first body (5) and provided with a first hole (10) intended for the insertion (Fig. 2) of a first bar (6) which is inserted in the seat defined by the first hole (10) and whose ends protrude orthogonally and sideways with respect to the first body (5) with a substantially "T" shape. Preferably the first bar (6) is blocked within the seat defined by the first hole (10), for example by interlocking or by interference. Alternatively the first hole (10) can be internally screw threaded and all of or at least the central portion of the first bar (6) can be correspondingly threaded for its screwing within the first hole (10). Further the male component (2) includes a threaded head (12) at the opposed end with respect to the end at which the first hole (10) is present, whose function will be explained in the following of the present description. Moreover the male component (2) comprises at least one reference element (4) whose function will be explained in the following of the present description.

In a similar way the female component (3) is composed of a cylindrically shaped second body (7) and provided with a second hole (11) intended for the insertion of a second bar (8) which is inserted in the seat defined from the second hole (11) and whose ends protrude orthogonally and sideways with respect to the second body (7) with a substantially "T" shape. Preferably the second bar (8) is blocked within the seat defined by the second hole (11), for example by interlocking or by interference. Alternatively the second hole (11 ) can be internally screw threaded and all of or at least the central portion of the second bar (8) can be correspondingly threaded for its screwing within the second hole (11 ). Further the female component (3) includes a flange (13), or a protuberance of the second body (7) at the opposed end with respect to the end at which the second hole (11) is present. This flange (13) is used to prevent the bush (9) which is inserted on the second body (7) from coming off from the body (7) itself. The bush (9) is internally hollow and it includes a third hole (14) in correspondence with one of the two ends which communicates with an internally screw threaded hole (15) obtained at the opposed end of the bush (9) with respect to the end at which the third hole (14) is present.

The third hole (14) has a diameter higher than the diameter of the second body (7) but lower with respect to the sizes of the flange (13). In this way the bush (9) can freely slide along the second body (7) without slipping off from the same. At the opposite side with respect to the one at which the flange (13) is present, the slipping off is prevented (Fig. 2) by the application of the second bar (8). The screw threaded hole (15) has an internal screw thread corresponding to the screw thread of the threaded head (12) of the male component (2).

In a different embodiment (Fig. 14) the first bar (6) includes an internally threaded hole located in a central position with respect to the development in length of the body of the first bar (6) and the cylindrically shaped first body (5) is externally screw threaded at least in correspondence of the end corresponding to the fixing zone of the first bar (6), the external thread of the first body (5) corresponding to the internal thread of the threaded hole which is present on the first bar (6). In this way the first bar (6) is head screwed on the first body and successively it can be blocked in position by means of known systems. In a similar way, as represented, the same solution is also used for the second bar (8) which is applied on the second body (7). This solution presents the advantage that the first bar and the second bar have larger dimensions, increasing the coupling surface with the insertion seat on the frame and, therefore, the distribution of the tensioning force, furthermore increasing security and stability of the frame of the chair as a whole and obtaining a better anchoring effect.

Therefore the male component (2) and the female component (3) form a tie-rod (1 ) in which the male element (2) is able to couple (Figs. 3, 4) with the female element (3) by screwing the threaded head (12) within the screw threaded hole (15) of the bush (9) or vice-versa by screwing the bush (9) on the threaded head (12).

The reference element (4) is used (Fig. 5) to indicate to the user when to stop the pulling action which occurs by means of screwing the bush (9) on the threaded head (12), namely it indicates the end screwing position desired for the bush (9), as it will be explained in the following of the present description. Though in the illustrated embodiment the reference element has been represented by means of a circumferential notch developing along the entire circumference of the first body (5), alternative embodiments can provide that the reference element (4) is made by means of one or more notches located along the circumference of the first body (5), or by means of a painting or anyway a surface treatment of the first body (5) e.g. a varnished line along the circumference of the first body (5) itself, or by means of a series of reference punchings, or by means of other equivalent methods. In a different embodiment a reference element (4) consisting of a beating plate for the screwing end of the bush (9) can be also provided, intended to physically prevent the user from further screwing the bush (9). This solution, together with other adopted solutions prevents the user, even if non-expert, from putting the tie-rod insufficiently in traction, with a consequent poor stability of the assembled chair or from putting the tie-rod excessively in traction, with a consequent risk to damage the insertion seat of the tie-rod itself, causing the formation of cracks in the material the chairs are made of, creating weak zones of the structure which could lead to breakings, or to cause bendings of the frame itself with a consequent assembly difficulty, poor stability of the chair, or from putting some of the tie-rods excessively in traction and from putting other tie-rods insufficiently in traction creating zones with a greater stress and zones with a lower stress, deformations of the structure, possible loosening of some of the tie-rods. More than one reference element (4) can be also provided each of which defining a different pulling condition. The chair (21) according to the present invention can be made up in different ways. For example (Fig. 6) the chair (21) according to the present invention can consist of: - first couple of legs (16) forming a rear frame with rear legs;

- second couple of legs (17) forming a front frame with front legs;

- "H" shaped intermediate connection (18) interposed between the rear frame and the front frame;

in which the assembly of first couple of legs (16), second couple of legs (17) and intermediate connection (18) constitutes the frame of the chair on which a back (20) and a seat (19) are applicable.

For example (Fig. 7) the chair (21) according to the present invention can consist of a first couple of legs (16) forming a first part of the frame, a second couple of legs (17) forming a second part of the frame, an "H" shaped intermediate connection (18) interposed between the first part of the frame and the second part of the frame, the assembly of first couple of legs (16), second couple of legs (17) and intermediate connection (18) constituting the frame of the chair on which a back (not represented) and a seat (not represented) are applicable.

For example (Fig. 11) the chair (21) according to the present invention can consist of a first couple of legs (16) forming a first side of the frame with first side legs and arm rest (28), a second couple of legs (17) forming a second side of the frame with second side legs and arm rest (28), an "H" shaped intermediate connection (18) interposed between first side of the frame and the second side of the frame, the assembly of first couple of legs (16), second couple of legs (17) and intermediate connection (18) constituting the frame of the chair on which a back (not represented) and a seat (not represented) are applicable.

For example (Fig. 12) the chair (21) according to the present invention can consist of a first couple of legs (16) forming a front frame with front legs, a second couple of legs (17) forming a rear frame with rear legs and a back (20), an "H" shaped intermediate connection (18) interposed between the rear frame and the front frame, in which the assembly of first couple of legs (16), second couple of legs (17) and intermediate connection (18) constitutes the frame of the chair with back on which a seat (not represented) is applicable.

The back (20) can be integrated in one of the frames including the first couple of legs (16) or the second couple of legs (17), it can be successively applied by means of a joint, gluing, screws, tie-rods (1 ) or by means of other equivalent fixing systems, it can be absent as for example in the case of stools or the like.

In a similar way the arm rests (28) can be integrated in one of the frames including the first couple of legs (16) or the second couple of legs (17), it can be successively applied by means of a joint, gluing, screws, tie-rods (1) or by means of other equivalent fixing systems, it can be absent as for example in the case of stools or the like.

In this way, due to the presence of the "H" shaped intermediate connection (18) interposed between the frames including the first couple of legs (16) and the second couple of legs (17) the previously described problems of security and strength of the overall structure are solved, increasing the life cycle of the chair itself. Indeed, at the moment in which one puts in tension the tie-rods (1), the intermediate connection (18) allows to put in shape the chair, deformations of the overall frame being not possible. The "H" shaped intermediate connection (18) consists of an oblong first element (25), an oblong second element (26) interconnected by a joining element (27) in between with respect to the respective ends.

In this way a solid assembly of the chair is obtained and its external shape can be changed as one likes varying both the seat and the back and the shape of the legs and also the shape and structure of the assembly way. For example the sides of the "H" shaped conformation of the intermediate connection (18) can be:

reciprocally parallel;

reciprocally diverging with respect to the direction from the rear to the front of the chair;

- reciprocally converging with respect to the direction from the rear to the front of the chair.

In order to facilitate the reciprocal coupling of the elements forming the frame insertion holes (23) intended for the application of pins (22) can be provided for the head coupling between the first couple of legs (16), the second couple of legs (17), the intermediate connection (18). For example an insertion hole (23) could be provided in correspondence with each head coupling end of the intermediate connection (18), within each of the holes one of the ends of a corresponding pin (22) being inserted, the other end of which is inserted inside another insertion hole (23) obtained at the coupling surface which is present on the frame comprising the first couple of legs (16) or the second couple of legs (17). It will be apparent that according to the desired structural stability one can provide even more sets of insertion holes (23) and pins (22) for each head coupling end of the intermediate connection (18), as for example (Fig. 6) two sets of insertion holes (23) and pins (22) for each head coupling end of the intermediate connection (18).

In correspondence (Figs. 7, 8, 9) with each of the head coupling ends of the intermediate connection (18) with the corresponding frame comprising the first couple of legs (16) and with the corresponding frame comprising the second couple of legs (17) a slot (24) is present. Each of the slots (24) is obtained on one side (31 ) of one component of the frame of the chair and each of the slots (24) connects (Figs. 8, 9, 10) the side (31) with a chamber (30) internally obtained inside the component itself of the frame of the chair. The chamber (30) is intended to constitute the insertion air space of the first bar (6) and of the second bar (8). For example the chamber (30) can be obtained by making auxiliary holes (29) orthogonally with respect to the development of the slot (24) and obtained on a side of one component of the frame which is an adjacent side with respect to the side (31 ) on which the slot is obtained (24). Alternatively the chamber (30) can be obtained by means of an undercut milling, the realization also of the auxiliary holes (29) therefore being not necessary.

The width of the slot (24) will be greater than or equal to the length of the first bar (6) and second bar (8). The height of the chamber (30) will be greater than the length of the first bar (6) and second bar (8). In this way it will be sufficient to insert the first bar (6) or the second bar (8) within the slot (24) so that the first bar (6) and second bar (8) are parallel to the longitudinal development of the slot (24). When the first bar (6) or the second bar (8) are inserted through the slot (24) and they are inside the chamber (30) it will be sufficient to rotate them by 90 degrees to obtain their blocking configuration within the seat defined by the chamber (30) itself, the locking occurring following the pulling action applied by screwing the bush (9).

In a different embodiment (Fig. 13) the width of the slot (24) can also be lower than the length of the first bar (6) and second bar (8) and the height of the chamber (30) can be just slightly greater than the length of the first bar (6) and second bar (8). In this case the supply of an essentially "T" shaped slot (24) is provided in which the upper portion of the "T" shape corresponds to the portion within which the first bar (6) or the second bar (8) of the tie-rod (1 ) are to be inserted and the lower portion of the "T" shape corresponds to the portion within which the first body (5) or the second body (7) slide to be taken in the pulling position. As previously observed the lower portion of the "T" shape can have a length which is lower than the length of the first bar (6) and second bar (8), preventing them from coming off from the slot (24) in the case of possible rotations within the chamber (30).

In conclusion the present invention relates to a mountable/demountable wooden frame chair, of the type comprising at least one first couple of legs (16) forming a substantially "C" shaped first part of the frame, a second couple of legs (17) forming a a substantially "C" shaped second part of the frame, a seat (19) applicable on said frame, connection means with a head coupling between said first part of the frame and second part of the frame intended to form a structural bearing frame of said chair. In correspondence with each head coupling end at least one couple of insertion holes (23) is present, within each couple of insertion holes (23) a corresponding pin (22) being insertable. The chair includes at least four tie-rods (1 ) consisting of a "T" shaped male component (2) with a first body (5) and a first bar (6) which is orthogonal to it and a "T" shaped female component (3) with a second body (7) and a second bar (8) which is orthogonal to it. Male component (2) and female component (3) connect with each other by means of a screwing tension bush (9). The chair according to the present invention is a chair in which the connection means between the first part of the frame and the second part of the frame are a substantially "H" shaped intermediate connection (18) interposed between and head-coupling with the first part of the frame and the second part of the frame, the assembly of first couple of legs (16), second couple of legs (17) and intermediate connection (18) forming the frame of the chair on which said seat (19) can be applied. In correspondence of the head coupling zones, the intermediate connection (18) and the first part of the frame and second part of the frame are provided with a couple of slots (24) placed on sides which are at least approximately reciprocally orthogonal sides of the frame. Each of the slots (24) connects a side (31) of the frame elements with a chamber (30) internally obtained within the corresponding element of the frame. The chamber (30) is intended to constitute the insertion air space of first bar (6) and second bar (8). Each of said tie-rods (1) constitutes a tension and clamping means at an angle internally to the perimeter defined by the frame of the chair.

Through the present description and in the appended claims the expression "approximately reciprocally orthogonal" referred to a couple of elements of the frame of the chair is meant to mean that their reciprocal coupling occurs according to an approximately orthogonal direction, or according to a direction corresponding to a ninety-degree direction plus or minus a certain deviation angle with respect to the orthogonal direction, as in case of the example represented in figure 6. It will be apparent that this deviation with respect to the orthogonal direction can be a small but also a big deviation as for example a deviation corresponding to plus or minus forty-five degrees, respectively obtaining a coupling angle of 135 degrees or 45 degrees, such coupling angles comprising a deviation with respect to the orthogonal direction being just possible due to the effective pulling action applied by the tie-rods according to the present invention.

The description of this invention has been made with reference to the enclosed figures showing a preferred embodiment of the invention itself, but it is evident that many possible alterations, modifications and variations will be immediately apparent to those skilled in the art in light of the foregoing description. Thus, it should be understood that the invention is not limited by the foregoing description, but embraces all such alterations, modifications and variations in accordance with the spirit and scope of the appended claims.

Used nomenclature

With reference to the identification numbers reported in the enclosed figures, the following nomenclature has been used:

1. Tie-rod

2. Male component

3. Female component

4. Reference element or notch

5. First body

6. First bar

7. Second body

8. Second bar

9. Bush

10. First hole

11. Second hole

12. Threaded head

13. Flange or protuberance

14. Third hole

15. Threaded hole

16. First couple of legs

17. Second couple of legs

18. Intermediate connection

19. Seat 20. Back

21. Chair

22. Pin

23. Insertion hole 24. Slot

25. First element

26. Second element

27. Joining element

28. Arm

29. Auxiliary hole

30. Chamber

31. Side

Claims

1. Mountable/demountable wooden frame chair, of the type comprising at least one first couple of legs (16) forming a substantially "C" shaped first part of the frame, a second couple of legs (17) forming a substantially "C" shaped second part of the frame, a seat (19) applicable on said frame, connection means with a head coupling between said first part of the frame and second part of the frame intended to form a structural bearing frame of said chair, in correspondence with each head coupling end at least one couple of insertion holes (23) being provided, within each couple of insertion holes (23) a corresponding pin (22) being insertable, at least four tie-rods (1 ) consisting of a 'T' shaped male component (2) with a first body (5) and a first bar (6) which is orthogonal to it and a "T" shaped female component (3) with a second body (7) and a second bar (8) which is orthogonal to it, said male component (2) and female component (3) connecting with each other by means of a screwing tension bush (9), characterised in that said connection means between said first part of the frame and second part of the frame are a substantially "H" shaped intermediate connection (18) interposed between and head-coupling with said first part of the frame and the second part of the frame, the assembly of said first couple of legs (16), second couple of legs (17) and intermediate connection (18) forming the frame of said chair, in correspondence of the head coupling zones said intermediate connection (18) and said first part of the frame and second part of the frame being provided with a couple of slots (24) placed on sides which are at least approximately reciprocally orthogonal sides of said frame, each of said slots (24) connecting a side (31 ) of said frame elements with a chamber (30) internally obtained within it, said chamber (30) constituting the insertion air space of said first bar (6) and second bar (8), each of said tie-rods (1) constituting a tension and clamping means at an angle internally to the perimeter defined by said frame of said chair.

2. Mountable/demountable wooden frame chair according to the previous claim characterised in that:

- said male component (2) consists of a cylindrically shaped first body (5) provided with a first hole (10) intended for the insertion with a locking action of said first bar (6) whose ends orthogonally and sideways protrude with respect to said first body (5) with a substantially "T" shape, said male component (2) including a threaded head (12) at the opposed end with respect to the end at which said first hole (10) is present;

- said female component (3) consists of a cylindrically shaped second body (7) provided with a second hole (1 1) intended for the insertion with a locking action of said second bar (8) whose ends orthogonally and sideways protrude with respect to said second body (7) with a substantially "T" shape, said female component (3) comprising said bush (9) which is internally hollow and which includes a third hole (14) in correspondence with one of the two ends which communicates with an internally screw threaded hole (15) obtained at the opposed end of said bush (9) with respect to the end at which said third hole

(14) is present, said female component (3) comprising a flange/protuberance (13) at the opposed end with respect to the end at which said second hole (1 1) is present, said flange/protuberance (13) preventing the extraction of said bush (9) which is inserted on said second body (7), said third hole (14) having a diameter higher than the diameter of said second body (7) and lower with respect to the sizes of said flange/protuberance (13), said screw threaded hole

(15) having an internal screw thread corresponding to the screw thread of said threaded head (12) of said male component (2).

3. Mountable/demountable wooden frame chair according to claim 1 characterised in that:

- said male component (2) consists of a cylindrically shaped first body (5) and said first bar (6) includes an internally threaded hole located in a central position with respect to the development in length of the body of the first bar (6), said cylindrically shaped first body (5) being externally screw threaded at least in correspondence of the end corresponding to the fixing zone of said first bar (6), the external thread of the first body (5) corresponding to the internal thread of the threaded hole which is present on the first bar (6), said first bar (6) being head screwed on said first body (5) and possibly blocked in position, the ends of said first bar (6) orthogonally and sideways protruding with respect to said first body (5) with a substantially "T" shape, said male component (2) including a threaded head (12) at the opposed end with respect to the end at which said first bar (6) is present;

- said female component (3) consists of a cylindrically shaped second body (7) and said second bar (8) includes an internally threaded hole located in a central position with respect to the development in length of the body of the second bar (8), said cylindrically shaped second body (7) being externally screw threaded at least in correspondence of the end corresponding to the fixing zone of said second bar (8), the external thread of said second body (7) corresponding to the internal thread of the threaded hole which is present on the second bar (8), said second bar (8) being head screwed on said second body (7) and possibly blocked in position, the ends of said second bar (8) orthogonally and sideways protruding with respect to said second body (7) with a substantially "T" shape, said female component (3) comprising said bush (9) which is internally hollow and which includes a third hole (14) in correspondence with one of the two ends which communicates with an internally screw threaded hole (15) obtained at the opposed end of said bush (9) with respect to the end at which said third hole (14) is present, said female component (3) comprising a flange/protuberance (13) at the opposed end with respect to the end at which said second bar (8) is present, said flange/protuberance (13) preventing the extraction of said bush (9) which is inserted on said second body (7), said third hole (14) having a diameter higher than the diameter of said second body (7) and lower with respect to the sizes of said flange/protuberance (13), said screw threaded hole (15) having an internal screw thread corresponding to the screw thread of said threaded head (12) of said male component (2).

4. Mountable/demountable wooden frame chair according to any of the previous claims characterised in that said male component (2) of said tie-rod (1) comprises at least one reference element (4) indicating a corresponding end screwing position desired for said bush (9).

5. Mountable/demountable wooden frame chair according to the previous claim characterised in that said at least one reference element (4) is at least one notch obtained on said first body (5).

6. Mountable/demountable wooden frame chair according to claim 4 characterised in that said at least one reference element (4) is a notch obtained on said first body (5), said notch being a circumferential notch developing along the entire circumference of said first body (5).

7. Mountable/demountable wooden frame chair according to claim 4 characterised in that said at least one reference element (4) is a varnished line or a surface treatment of said first body (5).

8. Mountable/demountable wooden frame chair according to claim 4 characterised in that said at least one reference element (4) is a beating plate for the screwing end of said bush (9), said plate preventing the further screwing of said bush (9) once the beating condition is reached.

9. Mountable/demountable wooden frame chair according to any of the previous claims characterised in that said first couple of legs (16) forming said substantially "C" shaped first part of the frame is a first side of the frame with first side legs, and in that said second couple of legs (17) forming said substantially "C" shaped second part of the frame is a second side of the frame with second side legs.

10. Mountable/demountable wooden frame chair according to the previous claim characterised in that said first couple of legs (16) and said second couple of legs (17) protrude upwards to form a supporting structure with arm rests (28).

11. Mountable/demountable wooden frame chair according to any of the previous claims 1 to 8 characterised in that said first couple of legs (16) constitutes said substantially "C" shaped first part of the frame with front legs, and in that said second couple of legs (17) constitutes said substantially "C" shaped second part of the frame with rear legs.

12. Mountable/demountable wooden frame chair according to the previous claim characterised in that said second couple of legs (17) constituting said substantially "C" shaped second part of the frame with rear legs protrudes upwards to form a supporting structure with a back (20).

13. Mountable/demountable wooden frame chair according to any of the previous claims characterised in that said slot (24) is essentially "T" shaped, the upper portion of said "T" shape corresponding to the portion within which said first bar

(6) or said second bar (8) of the tie-rod (1) are inserted, the lower portion of said

"T" shape corresponding to the portion within which the first body (5) or the second body (7) slide to be taken in the pulling position.

14. Mountable/demountable wooden frame chair according to the previous claim characterised in that said lower portion of the "T" shape has a length lower than the length of said first bar (6) and second bar (8).