WO2011015254A1

WO2011015254A1 - Stave plane for pieces of furniture with tie-rod element

Info

Publication number: WO2011015254A1
Application number: PCT/EP2010/000910
Authority: WO
Inventors: Gabriele Centazzo
Original assignee: Valcucine S.P.A.
Priority date: 2009-08-03
Filing date: 2010-02-15
Publication date: 2011-02-10
Also published as: IT1399286B1; ITUD20090141A1

Abstract

Stave plane for pieces of furniture consisting of a series of staves reciprocally coupling by means of teeth and recesses in correspondence of the coupling surfaces between a stave and the following stave, each of said teeth on a stave corresponding to a recess obtained on the other stave characterised in that each of said staves comprises at least one hole (13), the hole (13) of each stave being aligned with the hole (13) of the adjacent stave, said hole being intended for the passage of at least one tie-rod (18), said tie-rod (18) applying a traction between the first end stave (2) and the second end stave (3) of said series of reciprocally coupled staves, said traction action involving the reciprocal packing of the ensemble of staves consisting of said first end stave (2), second end stave (3) and one or more intermediate staves (4).

Description

DESCRIPTION

STAVE PLANE FOR PIECES OF FURNITURE WITH TIE-ROD ELEMENT

Technical field

The present invention relates to a stave plane for pieces of furniture with tie-rod element according to the characteristics of the pre-characterizing part of claim 1.

Stave tables themselves fall within the present invention according to the characteristics of the pre-characterizing part of claim 9.

Prior art

In the field of the production of stave planes particularly for the production of pieces of furniture such as tables, small tables, working surfaces, chairs, deckchairs, stools, etc., the prior art techniques provide either the fixing of each of the staves forming the stave plane on a supporting structure, leaving the staves in a reciprocally spaced condition the one from the other, or the reciprocal sticking of the staves by means of glues and/or resins to form a plane free of interspaces between a stave and the next one and the successive fixing of the so obtained plane to a supporting element.

Problems of the prior art

The dried wooden tables have a humidity of about 6-8%, the water content of the wood being expressed as the difference between the difference in weight between the unseasoned wood and the dry wood, divided by the dry wood weight.

In a home environment at 2O⁰C with humidity of 50-60%, corresponding to the optimal environmental conditions for a man, the wood exchanges humidity with the environment in which it is located, getting to a condition in which it has a humidity of 10-13%. But if, on equal temperatures, the environmental air humidity rises for example up to 80-85%, after some time an additional increase of the humidity of the wood can occur, even of 6-7%. Vice-versa if the air humidity decreases for example down to 30-35%, the wood will progressively adapt itself until humidity values close to about 5-7% are reached.

Still worst conditions can occur in the case in which the table is located outdoor, exposed to environmental conditions with greater humidity or in which the it is exposed to the direct sun, etc.

This causes, even after the wood has been installed, any positive or negative variation of its humidity content to be transposed into a dimensional change.

For this reason, particularly for the tables intended for outdoor use, it is necessary for each of the staves forming the stave plane to be fixed on a supporting structure in an independent way and without contact between adjacent staves, leaving the staves reciprocally spaced the one from the other, so that the dimensional variations of the staves do not cause, due to the forces that would be established between adjacent staves, the bending the staves themselves. The presence of interstices between the staves to allow the dimensional variations, however, can be little practical, for example in case of the tables, because possible objects placed on the table top can fall down through the spaces between a stave and the next one. Moreover the number of hardware elements which are necessary to fix the single staves to the supporting structure is high, involving high costs also for the time needed to fix all the elements.

In the case in which one recurs to the reciprocal fixing of the staves by means of glues and/or resins it is necessary to use specific equipment which must be programmed from time to time depending on the required production. Moreover, in the long run, the sticking materials can cause partial or complete detachments. The plane made in this way must necessarily be arranged in the factory and it is not possible to supply the staves separate the one from the other to allow the assembly by the user; for this reason also the storing and the delivery of the piece of furniture made in this way is more complicated, stave planes having a considerable sizes having to be managed too. The use of glues and/or resins for the assembly makes difficult the dismounting operation for the disposal of the materials. Also the possible materials recycling is more difficult because of such presence of glues and/or resins.

Aim of the invention

The aim of this invention is to supply a table with a top plane made in staves which does not require the use of glues and/or resins for the assembly, which is easy to be assembled and which is also successively easily demountable in order to facilitate the following disposal and/or recycling operations of the materials it consists of and which at the same time does not require a reciprocal spacing between the staves which are individually fixed to a supporting member.

A further aim is to supply to the table a greater structural strength and with a maximum resistance to the degradation, obtaining a structure which is durable in the course of time and resisting also to the stresses induced by phenomena as swelling, shrinkage, torsions due to climatic variations and/or ageing of the wood itself and/or to the induced deformations due to the variations of the climatic conditions and in particular to humidity variations.

A further aim of the presents invention is to obtain a coupling between the staves forming the plane of the table which also allows a fast assembly of the elements by the end user and/or by the staff responsible for the assembly.

A further aim of the presents invention is to reduce the hardware needed for the assembly.

Concept of the invention

The aim is reached with the characteristics of the main claim. The dependent ciaims 'represent advantageous solutions. Advantageous effects of the invention

The solution according to the present invention, by the considerable creative contribution the effect of which constitutes an immediate and not negligible technical progress, presents many advantages.

First of all the solution according to the present invention has a particularly simple embodiment because the machining to be made on the elements are elementary and easy to be performed by means of usually available instruments during the working the elements themselves. The provided machining, moreover, can be easily integrated in the machining phase of the elements themselves, preventing the need to perform different machining with different machineries. As a result there are also benefits from the economical point of view relative to the machining needed for the preparation of the elements for their successive assembly.

Also the mounting times are considerably reduced thanks to the absence of a high number of hardware elements by means of which to perform the reciprocal assembly of the elements, this involving as a result further advantages from the economical point of view.

Moreover benefits from the economical point of view are present also due to the fact that the assembly can be directly made by the end user, the use of particular equipment and/or specialized staff not being required for the assembly.

Moreover the solution according to the present invention presents advantages from the point of view of the stability of the made structure which is subject to climatic and humidity conditions which are variable in the course of time, compensating the consequences of possible deformations due to the characteristic phenomena of the elements in wood, as swelling, shrinkage, torsions due to climatic variations and/or ageing of the wood.

Moreover the solution according to the present invention allows the production of structures without the use of adhesive materials and/or resins thus eliminating the need of specific equipment for the construction.

The absence of glues and/or resins involves also benefits from the environmental point of view.

Moreover benefits are obtained by the point of view of the recycling of the used materials.

The risk is considerably reduced relative to partial detachments of the staves from the supporting structure of the plane consisting of them.

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 view of the elements constituting the stave plane for a table according to the present invention.

Fig. 2 represents an exploded view of the elements constituting the stave plane for a table according to Fig. 1 in which some of the elements are partially assembled.

Fig. 3 represents an exploded view of the elements constituting the stave plane for a table according to Fig. 2 in which some of the elements are partially assembled.

Fig. 4 represents an exploded view of the elements constituting the stave plane for a table according to Fig. 3 in which some of the elements are partially assembled.

Fig. 5 represents a view of the final result of the assembly of the elements constituting the stave plane for a table according to the present invention in which the end phase is illustrated relative to the tightening of the elements.

Fig. 6 represents a view of the final result of the assembly of the elements constituting the stave plane for a table according to the present invention in which the closing phase is illustrated relative to the seats of the tightening element.

Fig. 7 represents a plan view of the final result of the assembly of the elements constituting the stave plane for a table according to the present invention in which the effect of the tightening element is illustrated.

Fig. 8 represents a side-view of the final result of the assembly of the elements constituting the stave plane for a table according to the present invention.

Fig. 9 represents a three-dimensional view of a table according to the present invention.

Description of the invention

The stave plane for tables according to the present invention (Fig. 1) consists of a series of staves (2, 3, 4) reciprocally coupling the one to the other by means of teeth (20) and recesses (21) of which one is a first end stave (2) and one is a second end stave (3) each of which provided with a first seat (14) and a second seat (15) connected by a hole (13), the sequence of said first seat

(14), hole (13) and second seat (15) constituting a passage between the terminal ends (22) of said first end stave (2) and second end stave (3) and the end intended to be coupled with a corresponding end of an intermediate stave

(4), each intermediate stave (4) being provided with a hole (13) connecting the ends intended to be coupled with a corresponding adjacent stave.

The staves (2, 3, 4) are reciprocally fixed by means of a series of fixing elements shaped in such a way to be inserted inside said holes (13) and said first seats (14) and second seats (15), said series of elements comprising a spring (5), two spring supports (6), two threaded bars (7), a pipe (8), two security nuts (9).

The fixing the overall assembly of the stave plane occurs by means of the application of two washers (10) and two fixing nuts (11).

The assembly of said fixing elements (Fig. 2) constitutes a tie-rod (18) in which the spring (5) constitutes the intermediate element fixed at each end to a spring support (6) by means of blocking means (16), each spring support (6) being fixed at the end which is the opposite end with respect to the end on which the spring (5) is present, to a threaded bar (7), said fixing being possibly made either by a simple screwing of the threaded bar (7) on the spring support (6) or by means of the use of a grain (17) intended to prevent the successive reciprocal rotation of the two elements or still by means of mixed solutions including both the screwing of the threaded bar (7) and the locking by means of a grain (17). In the preferred solution of the present invention the so made assembly consisting of spring (5), spring supports (6), threaded bars (7), is inserted in a pipe (8) intended to favuor the sliding of the elements fixed to the spring and due to the action the spring itself. However, it will be apparent that said pipe (8) can be absent for example in the case of staves having a particularly high thickness in which the hole (13) can be much greater than the diameter of the spring and/or than the diameter/sizes of the spring support (6). It will be apparent to those skilled in the art of the sector that the security nuts (9) screwed on the threaded bar (7) can be substituted by equivalent elements which have the same function as it will be described in the following of the present description, as grains, nut and locknut assembly, etc.

The tie-rod (18) can be supplied as an element which is dismounted in its components or as a pre-assembled element. It will be apparent that tie-rods (18) of different length can be prearranged according to the overall width of the plane made consisting of the assembly of the staves (2, 3, 4), being possible to change the width of the plane both increasing the width of one or more staves (2, 3, 4) or increasing the number of intermediate staves (4). It will be apparent to those skilled in the art of the sector that also in the case in which it is necessary to keep in stock tie-rods (18) having different lengths, the number of pieces to manage in stock is reduced because to increase the length of the tie- rod it will be sufficient to prearrange threaded bars (7) having different lengths while the other elements constituting the tie-rod (18) will remain unchanged in form and sizes.

It will be aparent to those skilled in the art of the sector that while in the illustrated embodiment the tie-rod (18) includes only one spring (5) in between, according to the force required to the tie-rod (18), more than one spring (5) or springs having a bigger size can be present, the invention not being limited by the represented shape/length ratios.

Once arranged the tie-rod (18), one will proceed (Fig. 3) with the reciprocal assembly of the intermediate staves (4) and of one of said first and second stave (2, 3). It will be apparent that while in the represented solution the second stave (3) is assembled on the assembly of intermediate staves (4) and the first stave (2) is used in the following fixing phase, in an absolutely equivalent way one can assemble the first stave (2) on the assembly of intermediate staves (4) and use the second stave (3) in the following fixing phase. The assembly of the staves is facilitated by the presence of recesses (21) alternated with teeth (20) in correspondence of the coupling surfaces connecting a stave with the following stave, each of said teeth (20) on a stave corresponding to a recess (21) obtained on the other stave. It will be apparent that shape, sizes and arrangement of said recesses (21) alternated with teeth (20) can also be different with respect to the represented solutions, the reciprocal coupling possibly involving also a clamping providing at least a partial locking between the staves to facilitate the assembly, or also possibly not involving any type of locking to better use the characteristics of the present invention that will be described in the following of the present description. In the preferred embodiment of the present invention the length of each of said teeth (20) is slightly lower with respect to the depth of the corresponding recess (21) in which said tooth is inserted for reasons that will be clarified in the following of the present description.

At this point (Fig. 4) the tie-rod (18) is inserted inside the hole (13) of the last of the intermediate staves (4) and it is passed through the whole sequence of holes (13) of the whole series of intermediate staves (4) until the end of the threaded bar (7) penetrates in the second seat (15) of the second end stave (3), it crosses the hole (13) which puts into communication the second seat (15) with the first seat (14) and it exits within said first seat (14). In this phase, the security bolt (9) prevents the tie-rod (18) from exiting in an excessive way from the first seat (14), having in this case an adjusting function of the position of the tie-rod (18) internally to the assembly of staves (3, 4).

Acting from outside the first seat (14) of the second end stave (3) the washer (10) and the fixing bolt (11) are applied, the fixing bolt being only put in position to prevent the tie-rod (18) from withdrawing during the following assembly operations. As an alternative the fixing bolt (11) can be replaced by equivalent elements having the same fixing function as grains, nut and locknut assembly, etc., locking it right away in its final position without requiring further adjustments.

At this point the first end stave (2) is inserted on the previously arranged assembly of elements, so that the pipe (8) is accepted within the second seat (15) of said first end stave (2) and so that the end of the threaded bar (7), after being penetrated in the second seat (15) of the first end stave (2), goes through the hole (13) which puts into communication the second seat (15) with the first seat (14) and comes out within said first seat (14) of said first end stave (2). Acting from outside the first seat (14) of the first end stave (2) the washer (10) and the fixing bolt (11) are applied.

At this point (Fig. 5) the tie-rod (18) crosses the whole sequence of holes (13) of the whole series of intermediate staves (4) and also the first seats (14), second seats (15) and hoies (13) of said first end stave (2) and second end stave (3). The spring (5) is in the resting position and the tie-rod (18) can move inside the seat defined by said series of holes (13) and seats (14, 15) and it is free to slide internally, the stroke of the same being limited by the two security nuts (9) and by the two fixing nuts (11) and corresponding washers (10). Acting on both the fixing nuts (11), or if one of the two fixing nuts has already been locked in its final position acting only on the other fixing bolt (11) at the end which is the opposite end with respect to the one of the already locked fixing bolt (11), the corresponding threaded bar (7) is pulled shortening the portion of tie-rod (18) which is inside the series of holes (13) and seats (14, 15). Proceeding with the screwing of the fixing bolt (11) the position is reached in which both washers (10) within the respective first seats (14) of the first end stave (2) and second end stave (3) reach an abutment condition against the bottom of the corresponding first seat (14). Until this moment the spring (5) is still in the resting position. Further proceeding with the screwing the fixing bolt (11) the spring (5) is put in traction (shown in Fig. 5 by means of the arrows).

At this point (Fig. 6) the spring (5) will apply a traction force (shown in Fig. 6 by means of the arrows) which acts on the bottom of the corresponding first seats (14) by means of the washers (10). Said traction action applied by the spring (5) will be translated into a traction of the first end stave (2) with respect to the second end stave (3) and corresponding reciprocal packing action of the intermediate staves (4) together with said first end stave (2) and second end stave (3). Once the desired traction force have been set, which can be simply given by the overall length of the tie-rod (18) previously evaluated to exert the correct traction or it can be set and verified by means of appropriate instruments, the fixing bolt/s (11) can be locked in position by applying a lock nut (not represented) or by applying an appropriate thread locks, etc.

The application (figs. 6, 8, 9) of covers (12), for example made of the same material the staves (2, 3, 4) are made of or made of other material, closes the ends of the first seats (14) hiding the mechanism which is thus completely and advantageously inserted completely internally to the plane (1) consisting of the series of staves (2, 3, 4).

The staves (2, 3, 4), absorbing humidity, will increase their width and, as a result, they will further load the spring (5) of the tie-rod (18) which exerting its traction action will balance, will compensate and will contrast possible misalignments of the staves due to not-uniform expansions of the same. Vice- versa, when the staves (2, 3, 4) will yield humidity, they will decrease their width and will tend to create interstices and fissures between a stave and the successive one, but the traction action of the spring (5) of the tie-rod (18) will reciprocally approach again the staves (2, 3, 4) preventing said interstices and fissures to form.

Advantageously, as previously explained, the length of each of said teeth

(20) is slightly lower with respect to the depth of the corresponding recess (21) in which said tooth is inserted so that the abutment condition of the end of a tooth (20) against the bottom of the corresponding hollow (21) cannot occur. In this way one avoids the expansion action of a tooth (20) in an abutment condition against the bottom of the corresponding hollow (21) to reciprocally move away two adjacent staves creating a fissure, while the action of the spring (5) of the tie-rod (18) will counteract the formation of fissures between the staves due to the expansions/contractions of the wood said staves are made of.

Therefore, advantageously, (Fig. 7) the plane (1) consisting of staves (2,

3, 4) will be subject to a traction action (shown in Fig. 7 by means of the arrows) of one terminal end (22) with respect to the opposite terminal end (22) by means of the spring (5) of the tie-rods (18).

Depending on the size of the plane (1) one or more reciprocally spaced tie-rods (18) can be present.

The application of the present invention to stave pieces of furniture such as, only by way of example and without limitation for the application of the present invention, tables, small tables, working surfaces, chairs, deckchairs, stools, etc. is particularly advantageous.

In case (Fig. 9) of a table (19), the plane (1) consisting of staves (2, 3, 4) will be subject to a traction action of one terminal end (22) with respect to the opposite terminal end (22) by means of the spring (5) of the tie-rods (18).

The staves (2, 3, 4) due to the spring will always remain joined the one to the other without the formation of fissures.

The presence of the security nuts (9) avoids an excessive loading of the spring (5) by the operator during the assembly phase, in addition to preventing the tie-rod from withdrawing both during the assembly phases and in the case in which the fixing bolt (11) is loosened. The position of the security nuts (9) can be previously established in such a way that the operator during the assembling phase must necessarily get to the position corresponding to the abutment condition in order to ensure the application of a corresponding desired traction force.

Advantageously, as described, the fixing of the staves (2, 3, 4) occurs without the use of assembly glues and/or resins with consequent advantages from the environmental and economical point of view due to the absence of specific equipment and/or qualified staff. The assembly is simple and fast so that it can be made by the end user too, with consequent advantages from the economical point of view.

The pipe (8) favours the sliding of the elements of the tie-rod inside the series of holes (13) of the staves (2, 3, 4) preventing the tie-rod elements from stumbling or blocking because of a possible wood unevenness in correspondence with possible contact points. As previously highlighted the pipe (8) can be absent for example in the case of staves having a particularly high thickness in which the hole (13) can be much greater than the diameter of the spring and/or than the diameter/sizes of the spring support (6).

The system is also easily demountable both to facilitate the transportation when it is necessary, and to facilitate the operations of the following disposal and/or recycling of the materials it consists of.

Due to the traction action of the spring (5) of the tie-rod (18) a greater structural strength of the table (19) is also provided and having a maximum resistance to the degradation, obtaining a structure which is durable in the course of time and resisting also to the stresses induced by phenomena as swelling, shrinkage, torsions due to climatic variations and/or ageing of the wood itself and/or to the induced deformations due to the variations of the climatic conditions and in particular to humidity variations.

Also the number of pieces of hardware needed for the assembly is reduced, the supply being possibly be limited to the previously pre-assembled tie-rods (18) only and avoiding the use of fastening elements, e.g. self-threading screws, to be applied in more than one point of each stave to fix it to a corresponding supporting structure. In this way the assembly times are also considerably reduced.

The machining to be made on the elements are elementary and easy to be performed by means of usually available instruments during the working the elements themselves. The provided machining, moreover, can be easily integrated in the machining phase of the elements themselves, preventing the need to perform different machining with different machineries. As a result there are also benefits from the economical point of view relative to the machining needed for the preparation of the elements for their successive assembly.

The risk is considerably reduced relative to partial detachments of the staves from the supporting structure of the plane consisting of them due to the traction action of the spring (5) of the tie-rod (18).

In general a stave plane for pieces of furniture according to the present invention will consist of a series of staves reciprocally coupling by means of teeth and recesses in correspondence of the coupling surfaces between a stave and the following stave, each of said teeth on a stave corresponding to a recess obtained on the other stave and will be characterised in that each of said staves comprises at least one hole (13), the hole (13) of each stave being aligned with the hole (13) of the adjacent stave, said hole (13) being intended for the passage of at least one tie-rod (18), said tie-rod (18) applying a traction between the first end stave (2) and the second end stave (3) of said series of reciprocally coupled staves, said traction action involving the reciprocal packing of the ensemble of staves consisting of said first end stave (2), second end stave (3) and one or more intermediate staves (4).

More in detail, a stave plane for pieces of furniture according to the present invention will be characterised in that said tie-rod consists of at least one spring (5) to whose ends two spring supports (6) are fixed by means of blocking means (16), each spring support (6) being fixed, in correspondence with the end which is opposite with respect to the end on which the spring (5) is present, to a threaded bar (7), the threaded bar (7) ends which are opposite with respect to the end on which the spring support (6) is present, penetrating in the hole (13) of the second end stave (3) and the other one penetrating in the hole (13) of the first end stave (2), each of said threaded bar (7) ends opposite with respect to the end on which the spring support (6) is present, passing through the hole (13) and protruding inside a first seat (14) located on said second end stave (3) and first end stave (2), the tie-rod (18) locking in the seat and the preloading of the spring (5) occurring by means of a washer (10) and a fixing nut (11), each washer (10) being in abutment with the bottom of the corresponding first seat (14), the screwing action of the fixing nut (11) involving the extraction of a corresponding part of the threaded bar (7) shortening the portion of tie-rod (18) which is inside the series of holes (13), the shortening of the portion of tie-rod (18) which is inside the series of holes (13) involving the traction of the spring (5), the reaction force of the spring (5) applying a traction of the first end stave (2) with respect to the second end stave (3) and corresponding reciprocal packing action of the intermediate staves (4) together with said first end stave (2) and second end stave (3).

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 alterations, modifications and variations will be 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 it 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. Stave plane

2. First end stave

3. Second end stave

4. Intermediate staves

5. Spring

6. Spring support

7. Threaded bar

8. Pipe

9. Security nut

10. Washer

11. Fixing nut

12. Cover

13. HoIe 14. First seat

15. Second seat

16. Blocking means 17. Grain

18. Tie-rod

19. Table

20. Tooth

21. Recess

22. Terminal end

Claims

1. Stave plane for pieces of furniture consisting of a series of staves reciprocally coupling by means of teeth and recesses in correspondence of the coupling surfaces between a stave and the following stave, each of said teeth on a stave corresponding to a recess obtained on the other stave characterised in that each of said staves comprises at least one hole (13), the hole (13) of each stave being aligned with the hole (13) of the adjacent stave, said hole (13) being intended for the passage of at least one tie-rod (18), said tie-rod (18) applying a traction between the first end stave (2) and the second end stave (3) of said series of reciprocally coupled staves, said traction action involving the reciprocal packing of the ensemble of staves consisting of said first end stave (2), second end stave (3) and one or more intermediate staves (4).

2. Stave plane for pieces of furniture according to claim 1 characterised in that said tie-rod consists of at least one spring (5) to whose ends two spring supports (6) are fixed by means of blocking means (16), each spring support (6) being fixed, in correspondence with the end which is opposite with respect to the end on which the spring (5) is present, to a threaded bar (7), the threaded bar (7) ends which are opposite with respect to the end on which the spring support (6) is present, penetrating in the hole (13) of the second end stave (3) and the other one penetrating in the hole (13) of the first end stave (2), each of said threaded bar (7) ends opposite with respect to the end on which the spring support (6) is present, passing through the hole (13) and protruding inside a first seat (14) located on said second end stave (3) and first end stave (2), the tie- rod (18) locking in the seat and the preloading of the spring (5) occurring by means of a washer (10) and a fixing nut (11), each washer (10) being in abutment with the bottom of the corresponding first seat (14), the screwing action of the fixing nut (11) involving the extraction of a corresponding part of the threaded bar (7) shortening the portion of tie-rod (18) which is inside the series of holes (13), the shortening of the portion of tie-rod (18) which is inside the series of holes (13) involving the traction of the spring (5), the reaction force of the spring (5) applying a traction of the first end stave (2) with respect to the second end stave (3) and corresponding reciprocal packing action of the intermediate staves (4) together with said first end stave (2) and second end stave (3).

3. Stave plane for pieces of furniture according to claim 2 characterised in that said tie-rod (18) further includes a security nut (9) in correspondence of the threaded bar (7) ends which are opposite with respect to the end on which the spring support (6) is present, said security nut (9) preventing an excessive shortening of the portion of tie-rod (18) which is inside the series of holes (13), said security nut (9) limiting the extraction of the corresponding threaded bar

(7).

4. Stave plane for pieces of furniture according to any of the claims 1 to 3 characterised in that it includes a pipe (8) constituting the housing of said tie-rod

(18) within said series of holes (13).

5. Stave plane for pieces of furniture according to any of the claims 1 to 4 characterised in that the fixing of said threaded bar (7) on the corresponding spring support (6) occurs by screwing the threaded bar (7) in a corresponding threaded seat.

6. Stave plane for pieces of furniture according to any of the claims 1 to 5 characterised in that the fixing of said threaded bar (7) on the corresponding spring support (6) occurs by applying a grain (17).

7. Stave plane for pieces of furniture according to any of the claims 1 to 6 characterised in that the length of each of said teeth (20) is lower with respect to the depth of the corresponding recess (21) in which said tooth is inserted.

8. Stave plane for pieces of furniture according to any of the claims 1 to 7 characterised in that each of said staves includes more than one hole (13), each hole (13) of the same stave being reciprocally spaced with respect to another hole (13) present on the same stave, holes (13) on the same stave having hole axes which are reciprocally parallel, each hole (13) of each stave being aligned with a corresponding hole (13) of the adjacent stave, said holes (13) being intended for the passage of a number of tie-rods (18) corresponding to the number of holes (13) present on each stave.

9. Stave table characterised in that it includes a stave plane (1) for pieces of furniture according to any of the claims 1 to 8.