ITAN20100108A1 - EXTENDABLE ROUND TABLE. - Google Patents

Description

â € œROUND EXTENDABLE TABLEâ €.

TEXT OF THE DESCRIPTION

The present patent application for industrial invention relates to a round table which can be extended by means of an opposing pair of identical retractable extensions, each having the shape of a crescent moon.

This model of table constitutes an authentic and absolute novelty, as until today the round extendable tables have always presented a standard configuration, according to which their top was formed by an opposing and coplanar pair of half-tops, in the shape of a semicircle, sliding above a support and guide frame, in such a way that, if necessary, they can be moved far enough away to leave a central space free, where to install one or more rectangular extension boards, each of which has a length equal to the diameter of said semicircular half-planes. In the table according to the invention, on the other hand, the two extensions are placed side by side with the outer edge of the table, the top of which is formed by a monolithic disk, which, placed in rotation around its center, causes - thanks to an ingenious mechanism - the translation in the opposite direction of the two extensions which, as already pointed out, each bear the shape of a crescent moon, the concave internal side of which consists of an arc of circumference able to adhere perfectly against the edge of said monolithic disc at the moment in which the table in question is brought to an elongated position.

The same mechanism automatically lowers the central monolithic disc when the extensions have been completely ejected, so that the disc and extensions assume a coplanar arrangement.

Vice versa, during the retraction phase of the lateral extensions, the same mechanism first of all determines the lifting of the central disc, so as not to hinder the approaching run of the two extensions under the same disc, where they remain completely hidden and protected once said phase is finished. retraction.

The table according to the invention substantially comprises:

- a central plane formed by a monolithic disc;

- an opposing pair of identical lateral extensions, of the retractable type below said central plane;

- a horizontal frame, supported by several legs and incorporating an opposing pair of parallel tracks;

- two opposite and identical slides, which support said pair of lateral extensions and which slide along said tracks; - a support platform for said central plane, which is free to rotate around a vertical axis passing through the center of said monolithic disc;

- an opposing pair of fixed cams designed to automatically cause the lifting and lowering of said platform-holder during the retraction and expulsion phases of the lateral extensions respectively;

- an opposing pair of connecting rods, each of which connects said platform-carrying platform to one of the two extension-carrying slides, in such a way that the rotation of the platform corresponds to the translation, in the opposite direction, of said slides. For greater clarity, the description of the table according to the invention continues with reference to the attached drawing tables, reported only by way of non-limiting example, in which:

- figs. 1A and 1B show, respectively, with an axonometric representation, the table in question in a non-elongated position and in an elongated position;

- fig. 2 is analogous to fig. 1A, with the only difference of showing the table top in a raised position, so as to highlight its underlying mechanism for moving the two side extensions;

- fig. 3 shows, with an exploded and axonometric drawing, some components of the table in question;

- figs. 4A and 4B show, seen from the side, the table in question in a non-elongated position and in an elongated position;

- figs. 5A, 5B and 5C show the opening and closing methods of the extendable table in question;

Figures 6 to 10C refer to a second constructive version of the table according to the invention, which differs from the first only in the conformation of the aforementioned revolving platform-holder platform and in the conformation of the means designed to condition the up and down movement of the surface. circular (1).

More precisely:

- fig. 6 shows, with an axonometric representation, said second constructive version of the table in question, with the side extensions (2) completely extracted and with the top (1) raised, so as to reveal the underlying movement mechanism of the extensions (2) to following the rotation of the table (1);

- fig. 7 is an enlarged detail of fig. 6, which shows the configuration of said movement mechanism; - fig. 8 shows the same movement mechanism of fig. 6, illustrated in the position it assumes when the extensions are completely retracted under the top (1);

- fig. 9 shows, with an exploded drawing and in axonometry, some components of the table in question, in this second construction version;

- figs. 10A, 10B and 10C show the opening and closing methods of this second constructive version of the extendable table in question.

With reference to Figures 1A to 5C, the table (T) in question comprises, in a first construction version, a circular top (1), consisting of a monolithic disc, and a pair of identical extensions (2), of the type retractable, in the sense that they are, as long as they are not used, stowed and hidden under the top (1), from diametrically opposite sides.

Each of these extensions (2) bears the shape of a crescent moon, the concave inner side of which (2a) consists of an arc of circumference with a radius equal to that of the plane (1).

Said table (T) also includes a support frame (3) for indirect support of both the circular top (1) and the extensions (2).

Said support frame (3) is, in turn, equipped at the bottom with legs (4) for support and stabilization on the ground.

With particular reference to figs. 2 and 3, said support frame (3) is formed by a quadrangular frame (3a), under which said legs (4) are fixed, while above it are fixed, from opposite sides, two identical currents ( 5), which act as support and guide rails for two identical slides (6 and 6â € ™) holder extensions.

Each sled is in fact formed by a portal frame, lying on a horizontal plane, within which we can distinguish a crossbar (6a and 6aâ € ™) and two legs (6b and 6bâ € ™).

Each current (5) acts as a support and guide for a pair of legs (6b and 6bâ € ™) respectively located and sliding on opposite sides of the same current (5).

Each slide (6 or 6â € ™) has small shelves (7) for supporting and fixing the respective extension (2).

The top (1) is supported and fixed on a platform, which in this case has the configuration of a cross (8), in turn fixed on a sleeve pin (9), with a vertical axis, seated and rotatable to the inside of a collar (10), forming an integral part of said frame (3) and in particular fixed to said supporting frame (3a).

In fact, said sleeve pin (9) is not only free to turn inside the collar (10) around a vertical axis (Y), passing through the center of the circular plane (1), but also to perform alternating strokes in vertical along the same axis (Y), always guided by said collar (10).

In fact, the four identical arms (8a, 8b, 8c and 8d) of said cross platform (8) protrude from the underlying sleeve pin (9) and their protruding sections adhere to the underlying collar (10), at least as long as said sleeve pin (9) stationed at the end of the descent stroke, a condition that corresponds to the layout of the extended table, with the extensions (2) coplanar with the top (1), as shown in fig. 1B.

Above said collar (10) there is a diametrically opposed pair of wedge-shaped cams (11), in relief, capable of automatically causing - as will be better explained below - the lifting and lowering of said platform to spider (8) during the retraction and ejection phases of the lateral extensions respectively.

Said cross platform (8) is in fact connected to the two slides (6,6â € ™) by means of two connecting rods (12), each of which is pivoted, at one (12a) of its ends (12a , 12b), in the midpoint of the crosspieces (6a, 6aâ € ™), while, at its other end (12b), it is pivoted to an arm (8a or 8c) of the cross platform (8) , as shown in fig. 5C.

From a kinematic point of view it can be said that said cross platform (8) helps to form, together with the opposing pair of connecting rods (12), a connecting rod-crank mechanism, suitable for transforming the angular oscillations of the crank, which The plane (1) is made integral, in alternate and opposite strokes of the slides (6,6â € ™) holder-extensions.

It should be noted that said connecting rods (12) are pivoted to the opposite and aligned pair of arms (8a and 8c), which never interfere - during the rotation of the cross platform (8) - with the underlying cams (11), intended for interact only with the other opposing and aligned pair of arms (8b and 8d).

Finally, attention should be drawn to the fact that said sleeve pin (9) externally bears a diametrically opposed pair of incisions (13), where the tip of a radial pin (14) is inserted and slides through the collar (10). It should be noted that each incision (13) comprises a first horizontal section (13a) connected with a second descending section (13b), in turn connected with a third horizontal section (13c).

The second descending portion (13b) has an inclination angle equal to that of the wedge-shaped cams (11), while said incision (13) has an overall length such as to subtend an angle in the center of 180 °. With reference to the triad of figs. 5A, 5B and 5C, the dynamics with which the automatic ejection of the lateral extensions (2) occurs when the plane (1) is dragged in rotation by an angle of 180 ° around the vertical axis is now described (Y) passing through its center.

With particular reference to fig. 5A, it should be noted that, when the table (T) is not in an elongated position, as shown in fig. 1A, the opposite and aligned pair of arms (8a and 8c) forms an angle (Î ±) with the axis of symmetry (X) of the extensions (2), in the shape of a crescent moon.

In this arrangement of the table, the sleeve pin (9) is stationed at its top dead center, supported by the pins (14), inserted in the first horizontal section (13a) of the incisions (13).

If the plane (1) is dragged in clockwise rotation, the equiverse rotation of the cross platform (8) is indirectly determined with consequent progressive extraction of the extensions (2) under the thrust of the connecting rods (12).

It is evident that the extraction strokes of the extensions (2) are guided by the rails (5) coupled to the slides (6 and 6 '), as well as the rotation of the cross platform (8) is guided by the pin at sleeve (9), rotatable exactly within the collar (10). When the extensions (2) have completed a reciprocal distance travel sufficient to bring their concave side (2a) outside the edge of the surface (1), the latter begins its lowering stroke, imposed by the coupling between the thorns (14) and the second descending section (13b) of the aforementioned incision (13); during this phase of descent of the cross platform (8), the aforementioned opposing pair of arms (8b and 8d) slide and rest on the sloping profile (11a) of the cams (11), while the other opposing pair of its arms (8a and 8c) slide and rest on the collar (10).

After a rotation of the table (1) by an angle equal to 180 ° minus (Î ±), the extensions (2) have completed their stroke of maximum extraction, which corresponds to an alignment of the aforementioned opposed pair of the arms (8a and 8c) with the aforementioned axis of symmetry (X), as shown in fig. 5B. In the configuration of maximum elongation of the extensions (2), also shown in fig. 5B, the plane (1) is at the end of the descent stroke and perfectly leveled with the extensions (2), whose concave side (2a) is, however, detached by a short space interval (S) from the edge of the circular plane (1).

To recover and reset said space (S), the plane (1) must be rotated again clockwise by an angle (Î ± â € ™) equal to the angle (Î ±).

In this way the connecting rods (12) - now transformed from struts into tie rods - are drawn towards the center of the plane (1) by the aforementioned copy of arms (8a and 8c); during this last angle of rotation (Î ± â € ™) of the plane (1), the spines (14) slide within the third horizontal section (13c) of the incision (13), so the plane (1) retains its alignment with the extensions (12), the concave side (2a) of which comes perfectly into contact with the edge of the top (1), after the latter has completed its 180 ° rotation, as shown in fig. 5C. With reference to the second group of figures from 6 to 10C, a second constructive version of the table (Tâ € ™) according to the invention is now described, which is substantially identical, both in structure and operating mode, to that previously described and illustrated. , with the exception of the conformation of the aforementioned revolving floor-holder platform and the conformation of the means designed to condition the up and down movement of the circular surface (1).

Precisely for this last purpose it is specified that in this second group of figures from 6 to 10C the same reference numbers have been used to indicate those constructive components of the table that are common to both constructive versions (T and T ...) of the table itself.

With particular reference to fig. 9, the table (Tâ € ™) comprises a support frame (30), under which said legs (4) are fixed, while above it are fixed, from opposite sides, two identical beams (5), which they act as support and guide rails for two identical slides (6 and 6â € ™).

The top (1) is supported and fixed on a platform (800), which in this case has the configuration of a hexagonal frame (80), which includes an opposed and aligned pair of arms (80a and 80c), which intersect respectively two opposite vertices of said hexagonal frame (80).

This opposed and aligned pair of arms (80a and 80c) is fixed on a central pin (90), with a vertical axis, seated and rotatable inside a collar (10), which is an integral part of said frame (30) .

In fact, said pin (90) is not only free to turn inside the collar (10) around a vertical axis (Y), passing through the center of the circular plane (1), but also to perform alternating vertical strokes according to the same axis (Y), always guided by said collar (10).

A fixed disk (100) is interposed between said platform (800) and said collar (10) which is anchored above said collar (10) and which has a central hole (100a) for the passage of said pin (90), which it is therefore rotatable both inside the collar (10) and in the hole (100a) of the disc (100).

Said disc (100) comprises an opposed pair of cams (110), practically constituted by an opposed pair of sides which each extend for almost an arc of half circumference and which are interrupted only for a short distance (200).

In fact, two consecutive sections of different height can be identified along each bank: a first long section (110a), of constant height, and a second short section (110b) of wedge-shaped profile, of decreasing height.

Said platform (800) is in fact connected to the two slides (6,6â € ™) by means of two connecting rods (120), each of which is pivoted, at one of its ends (120a), at the point of center line of the crosspieces (6a, 6aâ € ™), while, at its other end (120b), it is pivoted to the opposite and aligned pair of arms (80a or 80c) of the platform (800), as shown in fig . 10C.

Said opposed and aligned pair of arms (80a and 80c) protrudes from the opposed copy of cams (111), above which the same opposed and aligned pair of arms (80a and 80c) rests and slides during the rotation of the platform (800), on which the plane (1) is fixed.

With reference to the triad of figs. 10A, 10B and 10C, the dynamics with which the automatic expulsion of the lateral extensions (2) occurs when the plane (1) is dragged in rotation by an angle of 180 ° around the vertical axis is now described (Y) passing through its center.

With particular reference to fig. 10A, it should be noted that when the table (Tâ € ™) is not in an elongated position, the opposing and aligned pair of arms (80a and 80c) forms an angle (Î ±) with the axis of symmetry (X ) of the extensions (2), crescent-shaped.

In this table setting, the sleeve pin (9) is stationed at its top dead center, supported by the opposing and aligned pair of arms (80a and 80c) which rest on the aforementioned first long section (110a).

If the plane (1) is dragged in clockwise rotation, the equiverse rotation of the platform (800) is indirectly determined with consequent progressive extraction of the extensions (2) under the thrust of the connecting rods (120).

It is evident that the extraction strokes of the extensions (2) are guided by the rails (5) coupled to the slides (6 and 6â € ™), as well as the rotation of the cross platform (800) is guided by the pin ( 90), rotatable exactly within the collar (10).

When the extensions (2) have completed a reciprocal distance travel sufficient to bring their concave side (2a) outside the edge of the surface (1), the latter begins its lowering stroke, imposed by the sloping profile of the ™ aforesaid second section (110b); in other words, during this phase of descent of the platform (800), the aforementioned opposed and aligned pair of arms (80a and 80c) slide and rest on the sloping profile (110b) of the cams (110), beyond which said pair opposed and aligned with arms (80a and 80c) it is recessed precisely in the aforementioned section (200), as shown in fig. 8. After a rotation of the table (1) by an angle equal to 180 ° minus (Î ±), the extensions (2) have completed their stroke of maximum extraction, which corresponds to an alignment of the aforementioned opposed pair of the arms (80a and 80c) with the aforementioned axis of symmetry (X), as shown in fig. 10B. In the configuration of maximum elongation of the extensions (2), also shown in fig. 10B, the plane (1) is at the end of the descent stroke and perfectly leveled with the extensions (2), whose concave side (2a) is, however, detached by a short space interval (S) from the edge of the circular plane (1).

To recover and reset this space (S), the plane (1) must be rotated again clockwise by an angle (Î ± â € ™) equal to the angle (Î ±).

Finally, attention is drawn to the diametrically opposed pair of nibs (300), protruding from the internal part of the cams (110) and destined to interfere - as end stops for the 180 ° rotation of the platform (800) - with an opposite and aligned pair of arms (81 and 82), perpendicularly intersecting the opposite and aligned pair of arms (80a and 80c).

Said opposite and aligned pair of arms (81 and 82) is preferably fixed below a rod (83), fixed orthogonally above the opposite and aligned pair of arms (80a and 80c).

Claims (10)

CLAIMS 1) Round table extendable by means of an opposing pair of identical retractable extensions, comprising: - a circular top (1) and a pair of identical extensions (2), sliding, tucked away and hidden under the top (1), on diametrically opposite sides, each of which bears the shape of a crescent moon, whose internal concave side (2a) is made up of an arc of circumference with a radius equal to that of the plane (1); - a support frame (3,30) for indirect support both of the circular surface (1) and of the extensions (2); - a platform (8,800), which supports said plane (1) and which is fixed on a pin (9,90), with a vertical axis, installed inside a collar (10), which is an integral part of said frame (3,30), said pin (9,90) being free both to turn inside the collar (10) around a vertical axis (Y) passing through the center of the circular plane (1), and to perform alternating vertical strokes along the same axis (Y), always guided by said collar (10); - a pair of identical slides (6 and 6â € ™) for extension cables; - means (11,110) adapted to automatically cause the lifting and lowering of said platform (8,800) during its rotation around the axis (Y); - connection means (12,120) between said slides (6 and 6â € ™) and said platform (8,800), able to automatically cause the retraction and expulsion of the lateral extensions (2) during the rotation of the platform (8,800) around the axis (Y). 2) Round extendable table, according to the preceding claim characterized in that said support frame (3,30) supports, from opposite sides, two identical beams (5), which act as support and guide rails for said identical slides ( 6 and 6â € ™) extension holder. 3) Round extendable table, according to the previous claim characterized, by the fact that each sled is in fact formed by a portal frame, lying on a horizontal plane, within which a crossbar (6a and 6aâ € ™ can be distinguished) ) and two legs (6b and 6bâ € ™) respectively displaced and sliding on opposite sides of the same beam (5). 4) Round extendable table, according to one or more of the preceding claims characterized in that said platform (8) has the configuration of a cross, fixed on a sleeve pin (9) and bearing four identical arms (8a, 8b, 8c and 8d) which protrude from the underlying sleeve pin (9) and adhere to the underlying collar (10), at least as long as said sleeve pin (9) is stationary at the end of the descent stroke, a condition that corresponds to the extended table arrangement , with the extensions (2) coplanar with the floor (1). 5) Round extendable table, according to one or more of the preceding claims characterized in that said platform (8) is connected to the two slides (6,6â € ™) by means of two connecting rods (12), each of which is pivoted, at one (12a) of its ends (12a, 12b), in the midpoint of the crosspieces (6a, 6aâ € ™), while, at its other end (12b), it is pivoted to an arm (8a or 8c) of the platform (8). 6) Round extendable table, according to one or more of the preceding claims characterized in that said sleeve pin (9) externally bears a diametrically opposed pair of incisions (13), where the tip of a radial pin is inserted and slides (14), threaded through the collar (10); each incision (13) comprising a first horizontal section (13a) connected with a second descending section (13b), in turn connected with a third horizontal section (13c), where said second descending section (13b) has an equal inclination angle to that of the wedge-shaped cams (11), while said incision (13) has an overall length such as to subtend an angle in the center of 180 °. 7) Round extendable table, according to one or more of the first three claims, characterized in that said platform (800) bears the configuration of a hexagonal frame (80), which includes an opposite and aligned pair of arms (80a and 80c) , which intersect respectively two opposite vertices of said hexagonal frame (80) and which are fixed on a central pin (90), with a vertical axis, seated and rotatable inside said collar (10), which is an integral part of said frame (30). 8) Round extendable table, according to the previous claim, characterized in that a fixed disk (100) is interposed between said platform (800) and said collar (10) which is anchored above said collar (10) and which has a hole central (100a) for the passage of said pin (90), which is therefore rotatable both inside the collar (10) and in the hole (100a) of the disc (100); said disc (100) comprising an opposed pair of cams (110), practically constituted by an opposed pair of sides which each extend for almost an arc of half circumference and which are interrupted only for a short distance (200). 9) Round extendable table, according to the previous claim characterized in that each cam (110) comprises two consecutive sections of different height: a first long section (110a), of constant height, and a second short section (110b) of profile cuneiform, of decreasing height. 10) Round extendable table, according to one or more of claims 7 to 9, characterized in that said platform (800) is connected to the two slides (6,6â € ™) by means of two connecting rods (120), each of which it is pivoted, in correspondence of one (120a) of its extremity (120a, 120b), in the center point of the crosspieces (6a, 6aâ € ™), while, in correspondence of its other extremity (120b), It is pivoted to the opposite and aligned pair of arms (80a or 80c) 11) Round extendable table, according to one or more of claims 7 to 10, characterized in that said opposed and aligned pair of arms (80a and 80c) protrude from the opposed pair of cams (111), above which the same pair opposed and aligned with arms (80a and 80c) it rests and slides during the rotation of the platform (800) around the axis (Y). 12) Round extendable table, according to one or more of claims 7 to 11, characterized in that it comprises a diametrically opposed pair of nibs (300), protruding from the internal part of the cams (110) and capable of interfering - such as limit switch for 180 ° rotation of the platform (800) - with an opposite and aligned pair of arms (81 and 82), perpendicularly intersecting the opposite and aligned pair of arms (80a and 80c) and fixed below a rod (83), fixed orthogonally above the opposite and aligned pair of arms (80a and 80c). 13) Round extendable table, according to one or more of the preceding claims characterized in that: - when the table is not in an elongated position, the opposite and aligned pair of arms (8a and 8c, 80a and 80c) forms an angle (Î ±) with the axis of symmetry (X) of the extensions (2); - after a rotation of the platform (8,800) by an angle equal to 180 ° minus (Î ±), the extensions (2) have completed their maximum extraction stroke, which corresponds to an alignment of the aforementioned opposed pair of the arms ( 8a and 8c, 80a and 80c) with the aforementioned axis of symmetry (X); - after a rotation of the platform (8,800) by an angle of 180 °, the extensions (2) are coplanar to the surface (1) and their concave internal sides (2a) adhere to the edge of the surface (1).