WO2017060255A1

WO2017060255A1 - Joining and levelling device for parts of furniture and furnishing items

Info

Publication number: WO2017060255A1
Application number: PCT/EP2016/073698
Authority: WO
Inventors: Carlo Cattaneo
Original assignee: Leonardo S.R.L.
Priority date: 2015-10-09
Filing date: 2016-10-04
Publication date: 2017-04-13

Abstract

A joining and levelling device for parts of furniture and furnishing items, in particular between a first panel (11) and a pair of second panels (12,12') positioned on opposite sides with respect to said first panel (11) and which must be moved towards each other according to an approach direction (d,d') in order to bring the edge (B) of said pair of panels (12, 12') abutted in a tightening position against a surface (S) of the other panel(11), said joining device consisting of blocking groups (GB) and connection groups (GC) assembled on said panels (11,12,12'),characterized in that a levelling group (GL) is also provided inserted inside a same seat (S1) of the first panel (11) also containing said blocking groups (GB) and connection groups (GC), said seat (S1) being contained in a thickness (SP) of the first panel (11), said seat (S1) having a longitudinal axis (X) perpendicular to said direction (d,d'), and extending from an edge (B1) towards the interior of said first panel (11), said blocking groups (GB) and connection groups (GC) being positioned on opposite sides with respect to said levelling group (GL) and acting on each of said second panels (12,12').

Description

JOINING AND LEVELLING DEVICE FOR PARTS OF FURNITURE AND FURNISHING ITEMS

The present invention relates to a joining and levelling device for parts of furniture and furnishing items.

The joining between two panels, for example between a shoulder of a piece of furniture and a base, or in any case a shelf, is currently effected in the furniture and furnishing field using various procedures and with different solutions.

Examples of these solutions are known for example from patents US7494297, US5567081, US6547477 and US4408923.

These known solutions have a certain complexity and in any case have a certain visibility, as they require closing elements of the seats or holings necessary for positioning the elements that effect the joining especially in supporting parts of the furniture and/or furnishing item.

Much more simply, figures 1, 2 and 3 show a known solution of a joining device for parts of furniture and furnishing items, for example between a shoulder of a piece of furniture and a base, or in any case a shelf.

In the known solution illustrated, holings must be provided in both a shoulder 11 and a base 12 of a piece of furniture, both partially shown in a connection part of the same. The shoulder 11, in fact, provides a horizontal blind holing 13 and the base 12 provides even a double holing 14, 15. More specifically, a horizontal holing 14 to be aligned with the holing 13 of the shoulder 11, and a vertical holing 15, formed in the upper surface of the base 12, which intersects the first holing 14, for the insertion of a blocking element, for example a grub screw 16, wherein both holings are blind.

Said holing 13 has an axis A which is perpendicular to the shoulder 11.

This known joining device provides the positioning of a pin 17 with a first threaded end 18 inside an internally threaded bush 19 positioned in the holing 13 of the shoulder 11. The pin 17 contains, at the other end 20, a housing 21 for an end of the grub screw 16.

A bush 22 is housed in the vertical holing 15 of the base 12, which provides a horizontal pass-through hole 23 for receiving the protruding end 20 of the pin 17 and a vertical threaded pass-through hole 24 which receives the grub screw 16.

By thus positioning said elements forming the known joining device and juxtaposing the shoulder and the base according to the arrow F of figure 1, the coupling of figure 2 is obtained, with the pin 17 inserted in the holing 14 of the base 12 and in the bush 22.

The grub screw 16 is then screwed, with a tool 25, according to the arrow 26, into the bush 22 so that the tip of the grub screw 16 is positioned in the housing 21 provided at the free end 20 of the pin 17.

The tightening of the grub screw 16 pushes the base 12 against the shoulder 11 forming the final stable position shown in figure 3.

In this known solution, the blocking group is in the base, it is arranged perpendicular to the base and to the movement or approach direction and tightening between the shoulder and base. Only the pin, with which the blocking group cooperates, is provided in the thickness of the shoulder or side panel.

Said figure 3 indicates, by means of a series of arrows, the scheme of forces at play between the shoulder 11 and base 12 of the piece of furniture and between the parts of the joining device.

This final position also shows how the end of the holing 15 is present on the upper surface of the base 12, which is normally covered with a closing cap (not shown) .

Said holing and the corresponding cap form a visible part of the joining device. In the first place, this part does not have an aesthetically valid appearance as, although there is the presence of the cap, it shows how the joining has been effected. Furthermore, the cap itself, which is difficult to be brought specifically in line with the surface of the base, represents an obstacle for the insertion of any object, creating a protrusion, even if minimum, with respect to the upper surface of the base.

The presence of at least two holes in the base, moreover, intersecting each other, causes a weakening of the base itself that must sustain loads representing a possible cause of breakage.

Furthermore, if parts of furniture and/or similar furnishing articles must be levelled, a specific separate levelling device must be provided that also achieves this important task for always having a correct arrangement of the constituent parts.

The general objective of the present invention is to provide a joining device between parts of furniture and furnishing items, such as a shoulder and a base, capable of solving the drawbacks of the known art indicated above, in an extremely simple, economical and particularly functional manner.

A further objective of the present invention is to provide a joining device between parts of furniture and furnishing items, such as a shoulder and a base, which is not visible to an observer and therefore has a high aesthetical value.

Another objective of the present invention is to provide a joining device between parts of furniture and furnishing items, such as a shoulder and a base, which does not have any protrusion with respect to the upper surface of the base.

Yet another objective of the present invention is to provide a joining device between parts of furniture and furnishing items, such as a shoulder and a base, that also allows a levelling action, minimizing the elements involved in order to also achieve the previous objective of minimizing the visibility of the joining device and that of the levelling device previously indicated .

The structural and functional characteristics of the present invention and its advantages with respect to the known art will appear more evident from the following description, referring to the enclosed schematic drawings which show embodiment examples of the same invention. In the drawings:

figure 1 is a sectional view illustrating parts, spaced from each other, of a known joining device for parts of furniture and furnishing items, for example between a shoulder of a piece of furniture and a base or in any case a shelf;

figures 2 and 3 are two sectional views of the known device of figure 1, wherein figure 2 shows said parts juxtaposed with respect to each other and partially inserted in each other and figure 3 shows said parts completely inserted in each other and tightened;

figure 4 is a sectional view illustrating parts, spaced from each other, of a joining device for parts of furniture and furnishing items, for example between a shoulder of a piece of furniture and a base or in any case a shelf according to the invention, in an embodiment with said parts spaced from each other;

- figure 5 is a sectional view of the device of figure 4 with said parts juxtaposed and partially inserted in each other, representing the beginning of a blocking operation of the parts;

figure 6 is a sectional view of the device of figure 4 with said parts completely inserted in each other and tightened, wherein the blocking operation of the parts has been completed;

figure 7 is a sectional view of the device completely analogous to figure 6 with the parts completely inserted in each other and tightened wherein a leveling operation is effected with respect to the floor;

figure 8 is a raised side view of a casing containing most of the joining device according to the present invention of the type according to figures 4 to 7;

figure 9 is a raised side view according to the line IX-IX of figure 8 of the device;

figure 10 is a perspective view of the device as shown in figure 8 with the missing parts of the device in said figure 8 exploded;

figure 11 is a perspective view of the device in the casing part as shown in figures 8 and 9 with its parts exploded;

- figures 12 to 14 are perspective views of the cam part of the device in its various consecutive actuation phases ;

figure 15 is a perspective view from below of a further embodiment according to the present invention illustrating parts spaced from each other of a joining device for furniture and furnishing items, for example between a shoulder of a piece of furniture and a base or in any case a shelf;

figure 16 is an enlarged perspective view of a device such as that shown in figure 15 with an exploded part ;

figure 17 is a raised section with exploded parts of the device shown in figure 16 positioned in the parts of furniture;

- figure 18 is a perspective view similar to that of figure 16 completely assembled;

figure 19 is a section similar to that of figure 17 assembled and figure 19A is an enlarged detail of figure 17;

- figures 20, 21 and 21A are views similar to those of figures 18, 19 and 19A in a subsequent different operational position;

figure 22 is a perspective view resembling that of figures 16, 18 and 20 completely assembled, but illustrating the actuation elements of the levelling group;

figure 23 is a raised section of the device of figure 15 with actuation of the levelling group as shown in figure 22;

- figure 24 is an exploded perspective view illustrating the embodiment of the invention of figures 15-23.

With reference first of all to figures 4, 5, 6 and 7, these show an embodiment of a joining and levelling device for parts of furniture and furnishing items according to the invention.

In the example, the joining device must connect and join a first panel 11, for example a shoulder 11 of a piece of furniture together with a second panel 12 and with a third panel 12', each for example in the form of a base or in any case a shelf, partially shown in the figures. As illustrated in the examples, the shoulder 11 and the bases or panels 12, 12' are generally perpendicular to each other but they may also be tilted with respect to each other.

The two bases or panels 12, 12' are essentially similar as are also the parts of the device that are inserted therein. For the sake of simplicity, only one part relating to a first panel or base 12 will be described as the parts for the other base 12' are analogous both in the panel or base and in the parts of the device positioned therein.

The base 12 or 12' contains, at one of its ends, a seat S2 in the form of a horizontal blind holing 30 in which an internally threaded bush 31 is positioned for receiving a threaded end 32 of a screw with an enlarged head 50, which has the function of a pin.

In a part between the threaded end 32 and the enlarged head, the screw 50, in its part protruding from the panel 12, defines an annular housing 73 for a rotatable circular element 52 forming part of the joining device.

The screw with an enlarged head 50 defines a connection group GC to be firmly blocked for stably interconnecting said shoulder 11 and said base 12 on the one hand, and said shoulder 11 and said other base 12' on the other hand, as explained in greater detail hereunder .

The shoulder 11 provides a seat SI - for a blocking group GB and for a levelling group GL -, having a substantially elongated configuration, in the form of a vertical blind holing 36 which intersects with a first and a second horizontal blind holing 37, 38, spaced from each other, formed in this example on both sides of the shoulder 11 and aligned with each other. Furthermore, if only one base is to be connected with the shoulder 11, there is only one arrangement as described above.

The seat SI characteristically extends from a perimetric lower edge Bl towards the interior of the shoulder or panel 11.

A pair of half-shells 39, 40, are housed in the vertical holing 36, that form a cylindrical casing in a part of which the blocking group GB and the levelling group GL are housed. The blocking group GB provides a rotatable circular element 52, with a thickness of a peripheral edge having a variable dimension 74 acting as a cam for engagement, when rotated, with the annular housing 73 of the screw with an enlarged head 50.

The rotatable circular element 52 is positioned in a circular seat 75 complementarily grooved in a side portion of the respective half-shell 39 or/and 40.

The rotatable element 52 is kept in the seat 75 by a cap 76 centrally provided with a hole 77.

The rotatable circular element 52 also has a central hole 78 with which an outwardly enlarged seat 79 is associated (with two diametrically opposite grooves) for a flat tip 80 of a screwdriver 81.

Pins 70 and seats 71 positioned on the half-shell

39, 40 and on the caps 76, block the assembled parts or the circular element 52 free to rotate in their interior. The pins 70, once riveted for blockage, act as rivets.

The levelling group GL is also housed in an internal part towards the bottom of the two half-shells 39, 40.

It comprises a pinion-toothed crown bevel. A pinion 41 is rotatingly positioned inside a hole 42 formed in one of the two half-shells 39, which is aligned with the first horizontal holing 37 of the shoulder 11. The pinion 41 is engaged with a toothed crown 43, formed as head of a threaded screw 44, and can rotate in a seat 45 formed in the two coupled half-shells 39 and 40. The threaded screw 44 is in turn positioned in a threaded axial hole 46 and inside a supporting leg 82 on a floor P.

Said components 41, 43, 44, 46, 82 define the levelling group GL which cooperates according to the invention with both the blocking group GB and also with the connection group GC .

Figures 4 to 7 show how this collaboration takes place between the various groups indicated.

The parts of the joining device according to the present invention are first of all positioned, inserting the two half-shells 39 and 40 on the one hand in the holing 36 of the shoulder 11 after positioning the various elements described above in their interior. Each screw with an enlarged head 50 of the respective connection group GC, on the other hand, is positioned in the holing 30 of the respective base 12, 12', as shown in figure 4.

An edge B of each base 12, 12' is then moved towards the two surfaces S on opposite sides of the shoulder 11, inserting the protruding part of the screw with an enlarged head 50 in the second horizontal holing 38 of the shoulder 11 (figure 5) .

The flat tip 80 of the screwdriver 81 is subsequently inserted in the seat 79 (with two diametrically opposite grooves) present in the respective rotatable circular element 52 of the blocking group GB . The screwdriver 81 is rotated according to the arrow 83 causing the rotatable circular element 52 to rotate in its seat 75 so as to allow the engagement of the peripheral edge 74 having a greater thickness and acting as a cam, in the annular housing 73 of the screw with an enlarged head 50. Figures 12 to 14 show this type of operation in detail, illustrating the rotating element 52 and the screwdriver 81 in their operations in various consecutive actuation phases of this part of the joining and levelling device of the invention.

In this way, the tightening is effected between the shoulder 11 and the base 12, as shown in figure 6, by moving the base 12 in the direction d which is perpendicular to a longitudinal axis X of the seat SI or holing 36. Figure 6 indicates, through a series of arrows, the scheme of the forces at play between the shoulder 11 and the base 12 of the furniture and between the parts of this embodiment of the joining device .

The same operation is effected for the second base 12' in the direction d' towards the axis X by rotation of the second rotatable circular element 52 of the blocking group GB present in the half-shell 40 with the corresponding engagement of the respective peripheral edge 74 having a greater thickness acting as cam in the annular housing 73 of the screw having an enlarged head 50 positioned in the base 12' .

The joining is thus obtained by operating on both the blocking group GB and on the two connection groups GC.

According to the invention, the levelling of the furniture with respect to the floor P can also be effected by acting on the levelling group GL, which is also included and incorporated according to the present invention directly inside the two half-shells 39, 40.

For this purpose, as shown in figure 7, a shaped tool 47, such as a hexagonal key, is inserted according to the arrow 84 inside a complementary seat formed axially in the pinion 41 passing through the first holing 37 of the shoulder 11 so as to enable its rotation .

The rotation of the pinion 41 in turn causes the rotation of the toothed crown 43 formed in the head of the threaded screw 44. The rotation of the threaded screw 44 forces the downward movement of the supporting leg 82 to reach the floor P, thanks to the collaboration with the threaded axial hole 46 and inside the leg 82.

It should be pointed out that in order to effect the downward or upward movement of the leg, and not its contemporaneous rotation, specific anti-rotation means are provided.

In the example shown, the leg 82 is equipped with blocking means 82A, 82B against rotation (anti- rotational form) , which allow the translation of the leg 82 itself, preventing its rotation. The means 82A can consist, for example, of radial protrusions that are coupled inside corresponding seats 82B of the half- shells 39, 40.

In this way, an adjustment can be effected with respect to the floor P or other rest plane according to the double direction indicated by the arrow 85.

As can be clearly seen in the drawings, both the blocking group GB and the levelling group GL are inserted inside said seat SI that is contained in the thickness SP of the shoulder 11.

It should also be noted that also in this case, the joining and levelling device of the present invention essentially comprises a blocking group GB inserted inside a seat SI or elongated vertical holing 36 of the shoulder 11 which acts on a pair of screw 50 connection groups GC to be blocked, each positioned inside a seat S2 of the relative base 12, 12' and which extends from a horizontal holing 30 formed laterally with respect to the base 12 , 12 ' .

Figures 15 to 23 show a further embodiment according to the present invention of a joining device for parts of furniture and furnishing items, for example between a shoulder of a piece of furniture and a base, or in any case a shelf or pair of the same.

The same elements are indicated, also in this example, with the same reference numbers when possible.

Also in this example, the joining device must connect and join a first panel 11, for example a shoulder 11 of a piece of furniture, together with a second panel 12 and with a third panel 12', each for example in the form of a base or shelf.

The two bases or panels 12, 12' are essentially similar, as also the parts of the device that are inserted in the same and which are not described as they are completely identical to those described for the previous example.

Also in this example, the shoulder 11 provides a seat SI for a blocking group GB and for a levelling group GL . The seat or vertical blind holing 36 intersects with first and second horizontal holings 37, 38, spaced from and aligned with each other, formed on both sides of the shoulder 11. Furthermore, if only one base is to be connected to the shoulder, there is only one arrangement as described above.

The seat SI extends from a lower perimetric edge Bl towards the interior of the shoulder or panel 11.

Analogously, a pair of half-shells 39, 40 are housed in the holing 36, forming a casing inside part of which the blocking group GB and levelling group GL are housed.

The blocking group GB provides a cursor element 86 that can be moved between an engagement position and a disengagement position with the annular housing 73 of the screw having an enlarged head 50. Said cursor 86 is caused to move by the rotation of a cam element 87 that rotates inside a windowed seat 88 of an extension 86b of the cursor 86. Furthermore, the cursor 86 in this translation movement, is guided in a recessed seat 89 formed in a side portion of the respective half-shell 39 or/and 40. The rotation of the cam element 87 is actuated by means of a shaped tool 47, such as a hexagonal key, operating according to the arrow 90 after inserting it in a seat 91 of the same cam element 87.

The cursor 86 is kept in the seat 89 by means of a cap 92 provided with a pair of pass-through holes 93 for both housing a flange 94 protruding from the cam element 87 (and allowing the passage of the shaped tool 47), and also for allowing the passage of the enlarged head of the screw having an enlarged head 50.

Analogously to the previous example, pins 70 and seats 71 positioned on the half-shell 39, 40 and on the caps 92 block the assembled parts or each cursor 86 free to rotate in their interior. The pins 70, once riveted for blockage, act as rivets.

The levelling group GL is also housed in an internal part of the two half-shells 39, 40.

It comprises a pinion-toothed crown bevel. A pinion 41 is rotatingly positioned inside a holing 42 formed in one of the two half-shells 39, which is aligned with the first horizontal holing 37 of the shoulder 11. The pinion 41 is engaged with a toothed crown 43, formed as head of a threaded screw 44, and can rotate in a seat 45 formed in the two coupled half-shells 39 and 40. The threaded screw 44 is in turn positioned in a threaded axial hole 46 and inside a supporting leg 82 on a floor P. Said components 41, 43, 44, 46, 82 define the levelling group GL which cooperates according to the invention with both the blocking group GB and also with the connection group GC .

Figures 16 to 23 show how this collaboration takes place between the various groups indicated.

The parts of the joining device according to the present invention are first of all positioned, inserting the two half-shells 39 and 40 on the one hand in the holing 36 of the shoulder 11 after positioning the various elements described above in their interior. Each screw with an enlarged head 50 of the respective connection group GC, on the other hand, is positioned in the holing 30 of the respective base 12, 12', as shown in figure 17.

An edge B of each base 12, 12' is then moved towards the two surfaces S on opposite sides of the shoulder 11, inserting the protruding part of the screw with an enlarged head 50 in the second horizontal holing 38 of the shoulder 11 (figures 19 and 19A) .

The hexagonal shaped tip of the tool 47 is subsequently inserted in the seat 91 of the cam element 87, acting in rotation. This causes the descent of the cursor 86 which is caused to move by the rotation of the cam element 87 inside the windowed seat 88 of the extension 86b of the same cursor 86.

The cursor 86 is guided in this translation movement in the shaped recessed seat 89 formed in the side portion of the respective half-shell 39 or/and 40.

The descent of the cursor 86 ensures that a slot 95 with a surface having a tilted plane 96 formed in the same, is engaged in the annular housing 73 of the screw having an enlarged head 50. The screw having an enlarged head 50, in fact, provides a rounded shaped enlarged head in 97 suitable for interacting with the surface having a tilted plane 96 so as to push the enlarged head of the pin with an enlarge head 50. This interaction tightens the base 12 and/or 12' against the shoulder 11.

Figures 18 to 21a show this type of operation in every detail, illustrating the parts that interact with each other to block the shoulder 11 and bases 12, 12' (figure 21).

In this way, the tightening is effected between the shoulder 11 and the base 12, as shown in figure 21A, by moving the base 12 in the direction d (figure 19) which is perpendicular to a longitudinal axis X of the seat SI or holing 36. Figure 21A indicates, through a series of arrows, the scheme of the forces at play between the shoulder 11 and the base 12 of the furniture and between the parts of this embodiment of the joining device .

The same operation is carried out for the second base 12', analogously causing the movement of the base 12' in the direction d' towards the axis X by rotation of the second cam element 87 of the blocking group GB present in the half-shell 40 with corresponding engagement of the respective surface having a tilted plane 96 that is engaged in the annular housing 73 of the opposite screw having an enlarged head 50 positioned in the base 12' .

According to the invention, the levelling of the furniture with respect to the floor P can now also be effected by acting on the levelling group GL, which is also included and incorporated according to the present invention directly inside the two half-shells 39, 40.

For this purpose, as shown in figures 22 and 23, a shaped tool 47', such as a hexagonal key, having a smaller dimension than that of the tool 47, is inserted according to the arrow 84 inside a complementary seat formed axially in the pinion 41 passing through the first holing 37 of the shoulder 11 so as to enable its rotation .

It should be pointed out that in order to effect the downward or upward movement of the leg, and not its contemporaneous rotation, specific anti-rotation means are provided such as those described in the previous example .

In a joining and levelling device according to the invention such as those described in the previous examples, the problem relating to the visibility of the holings that are hidden for the most part, has been advantageously solved. An aesthetically valid appearance of the furniture equipped with this device, that is also relatively compact, combining joining and levelling, is thus created.

Furthermore, any possible caps positioned in the holings do not interfere with what is resting on the base of the furniture that is free of any type of holing .

In this way, there are no obstacles on the base for the insertion of any object, eliminating any type of protrusion, even minimum, with respect to the upper surface of the base.

Furthermore, the elimination of holes that intersect with each other in the base eliminates or at least minimizes any possible weakening of the base itself that can therefore sustain high loads without the danger of a possible cause of breakage of the base. The levelling is effected with elements that are kept compact in the same device.

The forms of the structure for the production of a joining device of the present invention, as also the materials and assembly modes, can naturally differ from those shown for purely illustrative and non-limiting purposes in the drawings.

The objectives mentioned in the preamble of the description have therefore been achieved.

The protection scope of the present invention is defined by the enclosed claims.

Claims

1. A joining and levelling device for parts of furniture and furnishing items, in particular between a first panel (11) and a pair of second panels (12,12') positioned on opposite sides with respect to said first panel (11) and which must be moved towards each other according to an approach direction (d,d') in order to bring the edge (B) of said pair of panels (12, 12') abutted in a tightening position against a surface (S) of the other panel, (11) said joining device consisting of blocking groups (GB) and connection groups (GC) assembled on said panels (11,12,12'), characterized in that a levelling group (GL) is also provided inserted inside a same seat (SI) of the first panel (11) also containing said blocking groups (GB) and connection groups (GC) , said seat (SI) being contained in a thickness (SP) of the first panel (11), said seat (SI) having a longitudinal axis (X) perpendicular to said direction (d,d'), and extending from an edge (Bl) towards the interior of said first panel (11), said blocking groups (GB) and connection groups (GC) being positioned on opposite sides with respect to said levelling group (GL) and acting on each of said second panels (12,12') .

2. The device according to claim 1, characterized in that both of said blocking groups (GB) are positioned in a holing (36) of said shoulder (11) and act on a respective connection group (GC) to be blocked, positioned on a respective base (12,12') and which extends from a holing (30) produced laterally with respect to said base (12,12').

3. The device according to claim 1 or 2, characterized in that each connection group (GC) is produced in the form of a screw with an enlarged head (50) .

4. The device according to claim 2 or 3, characterized in that both of said blocking groups (GB) are housed in a casing (39,40) positioned in said holing (36) of said shoulder (11) together with said levelling group (GL) .

5. The device according to claim 1, characterized in that said blocking groups (GB) and said levelling group can both be actuated from a first holing (37) produced in said shoulder (11) .

6. The device according to claim 5, characterized in that each connection group (GC) with a screw having an enlarged head (50) can be associated with said shoulder (11) by a second holing (38) produced in said shoulder (11), said two holings (37,38) being spaced from each other and horizontal.

7. The device according to claim 1, characterized in that each blocking group (GB) comprises a rotatable circular element (52) with a thickness of a peripheral edge having a variable thickness dimension (74) acting as a cam for engagement, when rotated, with an annular housing (73) of a screw with an enlarged head (50) forming part of a respective connection group (GC) .

8. The device according to claim 7, characterized in that said rotatable circular element (52) is positioned in a circular seat (75) complementarily recessed in a side portion of a respective half-shell (39,40) of a casing containing both of said blocking groups (GB) , and being equipped with a cap (76) centrally provided with a hole (77), said rotatable circular element (52) also having a central hole (78) with which an outwardly enlarged seat (79) is associated for a flat tip (80) of a screwdriver (81) .

9. The j oining device according to one or more of the previous claims from 4 to 8 , characterized in that said levelling group (GL) positioned in said casing (39, 40) comprises a pinion-toothed crown bevel (41,43) , which is housed in said casing (39, 40) positioned in said holing (36) of said shoulder (11) and which controls the movement of a supporting leg ( 82 ) suitable for being engaged on a floor ( P) .

10. The j oining device according to claim 9, characterized in that a toothed crown (43) of said bevel extends into a threaded screw (44), which in turn is positioned in a threaded axial hole (46) inside said supporting leg ( 82 ) .

11. The j oining device according to claim 1 or 2, characterized in that each connection group (GC) comprises a screw with an enlarged head (50) which, in a threaded end ( 32 ) , is positioned in an internally threaded bush (31) placed in said holing (30) of said base ( 12 ) .

12. The device according to one or more of the previous claims , characterized in that a respective connection group (GC) collaborates with each blocking group (GB) , assembled on a respective panel ( 12 , 12 ' ) positioned on opposite sides with respect to said shoulder (11), each blocking group (GB) providing a rotatable circular element (52), with a thickness of a peripheral edge having a variable thickness dimension (74) acting as a cam for engagement, when rotated, with a respective annular housing (73) of a screw with an enlarged head (50) forming part of each of said connection groups (GC) .

13. The device according to cldim 1 _r ch.32 ci.cterized in that each blocking group (GB) comprises a cursor (86) which can be moved from an engagement position to a disengagement position with an annular housing (73) of a screw with an enlarged head (50) forming part of a respective connection group (GC) .

14. The device according to claim 13, characterized in that said cursor (86) of each blocking group is caused to move by the rotation of a cam element ( 87 ) rotatable inside a windowed seat (88) of an extension (86b) of the cursor (86), said cursor (86) being guided, in this translation movement, in a recessed seat (89) formed in a side portion of a casing (39, 40) positioned in said seat (SI) and containing said blocking groups (GB) and levelling group (GL) .

15. The device according to claim 14 , characterized in that said cursor (86) is kept inside said recessed seat (89) by a cap ( 92 ) .

16. The device according to claim 15, characterized in that said cam element ( 87 ) provides a flange ( 94 ) , protruding from the same, which is housed in a seat formed in said cap ( 92 ) and which receives rotation means of said cam element ( 87 ) .