IT201900009513A1 - Kit for the realization of a counter frame for retractable sliding doors - Google Patents

Description

Title: Kit for the realization of a counter frame for pocket sliding doors.

DESCRIPTION

The present invention relates to a kit for making a counter frame for retractable sliding doors. The kit is particularly suitable for transport and storage.

STATE OF THE TECHNIQUE

There are on the market counter frames for retractable sliding doors comprising a metal case, a track sliding system placed on an upper crosspiece on which the door is fixed, and a stop upright. This structure is integrated into the masonry, or covered with plasterboard panels.

The passage lights, i.e. the width and height of the door, are standardized, they generally have a height of 210cm and a width of 60, 70, 80, 90, 100 or 110cm, where 70 or 80 are the measurements more requests. The depth of the metal case is generally unique.

The subframe is therefore a very bulky object to transport, as it occupies a volume much greater than that of the material used alone.

Today it is common practice to solve this problem by sending the subframe disassembled and assembling the parts on site.

However, the assembly is long and complex, and must be carried out by an expert worker.

In any case, shipping and storage remain difficult to optimize due to the various possible measures.

Consider that today the shipping cost is one of the items that most affects the final cost of these products.

It should also be considered that retailers are obliged to accumulate assortments of various sizes pending any orders, unnecessarily occupying storage space. Consequently, many choose to keep only the best-selling sizes ready for sale, extending the availability times of the others.

The object of the present invention is to solve all or part of the problems of the known art.

In particular, a preferred object of the present invention is to provide a counter frame for retractable doors which allows an optimal bulk shipment to lower sales costs.

A further preferred object of the present invention is to provide a subframe with optimized mass storage spaces.

Another further preferred object of the present invention is to provide a counter frame that is easy to install.

A still further preferred object of the present invention is to provide a counterframe of economical construction.

Another object is to provide a product whose width is variable and can obviate the various widths required by the customer

GENERAL INTRODUCTION

According to a first general aspect, the present invention relates to a kit for making a counterframe for retractable sliding doors, where the counterframe (10) comprises a plurality of crosspieces (32) and uprights (34, 35) arranged to form at least one cage (14) which defines a housing compartment for a sliding door and an opening (17) for entry and exit from it, where the cage has a height in the vertical direction (V), a width in the sliding direction of the door (L), a depth in a direction orthogonal to the other two (P), said cage comprising two main sides (15a, 15b) facing parallel to each other and each having a development plane (z) in said height and in said width, characterized by the fact that in the kit said cage is separated from the other components of the counterframe (in particular it is preferably separated and mountable with respect to at least one upper crosspiece supporting a guide of the door) and comprises at least two folding groups panels (30) which define said main sides, where said groups (30) each comprise a plurality of crosspieces and at least one upright and are foldable in said respective development planes between a closed position of minimum overall width and an open position of maximum overall dimensions in width thanks to the relative rotation between the crosspieces and the upright in said plane, and where the cage (14) can be locked in the open configuration.

Advantageously, the kit according to the present invention reduces the overall width of storage and transport.

According to some preferred embodiments, with reference to the distance from the inlet and outlet opening (17), the cage (14) comprises at least one distal upright (35) and a pair of proximal uprights (34), where each proximal upright belongs to a folding group (30) and the two proximal posts are spaced from each other in the depth direction of the cage to define the opening 17, where the distal post (35) joins and distances the two folding groups (30) and in the kit it is joined or joined to the folding groups (30) in a way that can be rotated simultaneously with respect to the crosspieces (32) of each group and can slide with respect to them (34).

Advantageously, the kit in closed configuration has a reduced overall dimensions also in height, which is the most binding dimension in transport, given the standardized dimensions of the trucks and containers, the solution also facilitates the assembly of the cage on site even by unskilled personnel. . Preferably, the distal upright acts simultaneously as a translatable element for adjusting the size of the cage and as a lockable element for locking the cage in an open configuration.

Preferably, the distal upright (35) can slide at least towards and away from the proximal uprights (34), and is lockable in rotation and sliding with respect to the folding groups (30) in any one of a plurality of predetermined locking points arranged along said direction of scrolling.

Advantageously, the size of the cage in width can be adjusted so that a single kit is sufficient to make various or all the desired counterframe measures. This is not detrimental to the overall height in the closed storage and shipping configuration, as if the distal upright is also prepared in the kit already joined to the folding groups to create a pre-assembled cage ready for opening, it can translate into a position minimum overall height of the closed configuration, for example as close as possible to the proximal uprights.

The locking points, for example, can be arranged to define housing compartments for standard width doors, such as commonly 60, 70, 80, 90, 100, 110 cm. Therefore the burden of large ready-to-sell assortments for each size is eliminated. However, these measures are not to be understood in a limiting manner, the invention is in fact easily applicable to the realization of any width, including customized widths.

According to some preferred embodiments, the locking points (46) are snap locking points, where the locking of sliding and rotation occurs when a predetermined angle of rotation is reached between the crosspiece (32) and the distal upright (35 ).

In general, the kit comprises at least one rotation, sliding and locking mechanism (40) between at least one cross member (32) of a folding assembly (30) and the distal post (35), (more preferably such a mechanism is present between each cross member of each folding group and the distal strut) where the mechanism includes:

- at least one locking element (42) integral in movement with the distal upright (35) and sliding and rotatable with respect to a guide (44) of the crosspiece (32), where the locking element is lockable in rotation and sliding with respect to the crosspiece in said predetermined points (46).

Preferably the locking element (42) comprises a rotation pin (60) intended to define a rotation axis (X) orthogonal both to the crosspieces (32) and to the distal upright (35), from one end of the pin (60) a flange (61) is projected substantially orthogonally thereto which has one or more engagement elements, for example protrusions and / or notches (49);

- the crosspiece (32) has a substantially C-shaped section to create a rail-shaped guide (44) within which the flange (61) of the locking element (42) slides and rotates, along the rail (44) are made a plurality of engagement elements (48) complementary to those of the pin in correspondence with the locking points (46), for example notches and / or protrusions, where the engagement elements (48, 49) provide snap locking when they couple due to this rotation.

According to some preferred embodiments in the kit:

- the folding groups (30) and the distal upright (35) are joined together to form a pre-assembled cage unit (14) closed and ready to open,

- the crosspieces (32) of the folding groups can be rotated with respect to the distal upright (35) and to the respective proximal uprights (34),

- the distal upright (35) can be moved with respect to the crosspieces (32) of the folding units;

- the cross members (32) of the folding groups are free to rotate from a closed cage configuration to an open cage configuration, and preferably abut against stop elements (42, 49, 52) when the open configuration is reached;

- the pre-assembled unit (14) is lockable in the open configuration and preferably comprises rotation and translation locking elements, preferably they are snap-on and preferably are activated when both are reached between the open configuration and a translation position of the upright distal selected from a plurality of positions corresponding to predetermined widths of the open cage.

According to a preferable general characteristic, each folding group (30) comprises a proximal upright (34) to which a plurality of crosspieces (32) (preferably placed parallel and at predetermined distances between them) are rotatably joined, where in the kit the top end of the groups it has no crosspieces (32).

Advantageously, there is thus less vertical bulk in the closed configuration compared to that of a rotatable top crosspiece.

In this case, the groups (30) are preferably joined and spaced from each other by a distal upright (35) that can be rotated and slidable with respect to at least one crosspiece (32) and in the closed configuration kit said distal upright (35) is translated with respect to said cross member (32) in a position in which its top end is below or substantially at the top end of at least one cross member (32) of the groups rotated in closed configuration.

Advantageously, this further reduces the vertical bulk in the closed configuration

Preferably, the kit comprises an upper cross member (16) separated from the groups (30) and which can be fixed together at their upper end when they are in the open position to become the missing upper cross member of both folding groups (30).

in this case, the upper crosspiece (16) preferably projects from the cage in the direction of the width of the counter frame to surmount the passage opening of the door (20) and to support a sliding guide of the door.

DETAILED DESCRIPTION

Further characteristics and advantages of the present invention will become clearer from the following detailed description of its preferred embodiments, made with reference to the attached drawings and given by way of non-limiting example. In such drawings:

- figure 1 schematically shows a wall comprising a counter frame for sliding door according to the present invention, the wall is partially torn to allow the counter frame to be seen;

Figure 2 shows the counterframe of Figure 1 in an operative configuration;

- figures 3a and 3b show the counterframe of figure 2 in an exploded perspective and front view respectively;

- figure 4 shows, in the sequence from a to e, the phases of passage from a transport and storage configuration to an operating configuration of the counterframe of the previous figures, made possible thanks to folding units and a distal upright that can be rototranslated with respect to them, which it also allows the adjustment of the measure in width;

figure 5 shows the folding and adjustable cage of the counterframe of the previous figures in a transport and storage configuration;

figure 6a shows the coupling between a crossbar and a movable upright of the folding unit in a transport and storage configuration;

figure 6b shows detail G of figure 5a, on an enlarged scale, and without the upright for representative clarity;

Figures 6c and 6d are sectional views along the planes J-J and K-K respectively of the previous figure; - Figures 7a to 7d correspond to Figures 6a to 6d but in the operative configuration;

Figures 8a and 8b show the two main sides, in perspective view, of a roto-translation and locking element of the folding unit of the preceding figures;

figure 9a shows a main side of the crosspiece of the folding group of the previous figures and figure 9b its detail E;

figure 9c shows the other main side of the cross member of the folding group of the previous figures and figure 9d its detail F;

- figure 10a shows the mobile upright of the folding group of the previous figures and figures 10b and 10c respectively show its detail L and its section;

Figures 11 to 13 show the rotation sequence from the open configuration to the closed configuration of the cross members of the folding groups with respect to their proximal uprights, and the relative stop;

- figure 14 shows a variant of the counter frame according to the present invention for the realization of double-leaf retractable doors;

- figure 15 shows the folding and adjustable cages present in the kit for the construction of the counterframe of figure 14, in a transport and storage configuration.

With reference to Figure 1, a wall 1 is illustrated in which a retractable door 5 is obtained through the application of a counter frame according to the present invention indicated as a whole with the reference number 10. Conventionally we consider the orientation of the counter frame mounted in the wall to define the vertical V, horizontal O and depth P directions (orthogonal to the wall).

According to this convention, the height of the subframe 10 is that in the vertical direction V, the width that in the horizontal direction O and the thickness that in the depth direction P.

In the following we will also mean by "crosspieces" the elements with a prevalently straight longitudinal development in the horizontal direction O, and by uprights the elements with a prevalently straight longitudinal development in the vertical direction V.

We also define the relative positions of two elements as distal and proximal based on their distance from the passage opening 20, i.e. the passage space through the wall created by the door, for which the distal element is the farther of the two and the proximal one the closest.

The counter frame 10 is shown in figure 2 and comprises a foldable and adjustable cage 14, an upper crosspiece 16, and an abutment upright 18.

The cage 14 defines an internal compartment between two main sides 15a and 15b for housing a door (not shown). The main sides develop in respective Z planes parallel to said height and width directions.

The upper crosspiece 16 joins together the cage 14 and the stop upright 18, subtending the passage opening 20 of the door between them.

The upper crosspiece 16 is equipped with a rail sliding system (not shown) on which a leaf is fixed, to guide it from a condition hidden in the box 14 to a condition in which it obstructs the passage opening 20. The rail system for example, it can be of any type on the market.

To allow correct installation of the counterframe 10 in the wall 1, it also comprises one or more accessory spacing crosspieces 22, placed to cross the passage opening 20 to join together the cage 14 and the upright 18. They are removable and are eliminated. at the end of the construction of the wall. It is possible that the application of the spacing crosspieces 22 requires other accessory elements, such as for example a spacer upright 22b, also generally to be eliminated after installation.

The exploded views of figures 3a and 3b show the various parts of the counter frame 10.

The foldable and adjustable cage 14 comprises a pair of foldable assemblies 30 facing each other to define the main sides 15a and 15b. The respective Z planes of development in height and width are their folding planes.

Each of them comprises a plurality of crosspieces 32 rotatably joined at their proximal ends to a proximal upright 34 which keeps them spaced apart in a vertical direction. Preferably the proximal uprights 34 are not translatable with respect to the crosspieces 32.

The two folding groups 30 are joined together by a common distal upright 35, with the respective uprights 34 spaced apart in the direction of depth P to define the opening 17 for the entrance and exit of the door from the cage 14.

The distal upright 35 is rotatably and translatable joined to each of said crosspieces 32 thanks to respective rotation, translation and locking mechanisms, each of which is indicated as a whole with the reference number 40.

A mechanism 40 is shown in Figures 6a to 6d in an unlocked configuration in which both rotation and size adjustment of the cage is possible.

In particular, Figure 6a shows a crosspiece 32 and a portion of the distal upright 35. Their mechanism 40 comprises a locking element 42 integral in motion with the distal upright 35 to be sliding and rotatable with respect to a guide 44 of the crosspiece 32. The guide 44 is parallel to the longitudinal development direction of the crosspiece 32.

Along the guide there are locking points for the rotation of the locking element 46, placed at predetermined distances from each other, to make cages 14 of standard sizes, such as those corresponding to counter frames with a passage opening of 60, 70, 80, 90, 100 and 110 cm.

The locking points 46 are for example snap locking points, and comprise for example engagement elements 48 able to interfere with corresponding engagement elements 49 of the locking element 42. For example they are notches placed along the guide and protrusions placed on the locking element, or vice versa, to make a snap fit when in rotation the crosspiece 32 and the upright 35 are positioned orthogonal to each other.

In the illustrated embodiment, the locking element 42 is an element separate from the upright 35 and joined to it for example by interlocking, for example by means of a snap device 50. However, it is not excluded that the locking element 42 is made of single piece with the upright 35, for example by molding.

The locking element 42 preferably comprises an external shape 52 which provides a stop with respect to the guide 44 in the orthogonal condition of crosspiece 32 and upright 35, this shape comprises for example a rectilinear section.

Figures 6a to 6d show the crosspiece 32 and the upright 35 in an inclined and unlocked condition in which the cage is in a closed configuration for transport and storage. Figures 7a and 7d show the crosspiece 32 and the upright 35 in a locked condition orthogonal to each other, corresponding to an open operating configuration of the cage 14 placed inside the wall 1.

Figure 5 shows the cage 14 assembled and separated from the other components to form a group ready for shipment and storage. In particular, the cage 14 is separated from the upper crosspiece 16. In said figure, the cage 14 is in a closed configuration, and comprises two folding groups 30, the distal upright 35, the spacer upright 22b placed to keep the uprights spaced apart in the direction P 34 of the folding groups 30.

The distal upright 35 is located in proximity to the proximal uprights 34, and the crosspieces 32 are at a predetermined minimum inclination with respect to them.

Figure 4 shows the rotation and adjustment phases for the passage between the closed configuration of Figure 4 and the open configuration of the cage 14.

In particular, figure 4a is the closed configuration of figure 5. It highlights the relative positions of the upper ends 33, 37, 39 of the proximal upright 34, of the distal upright 35 translated and of the rotated crosspieces 32. These ends are located substantially close to each other. In particular, the upper end 33 of the translated distal upright 34 is preferably located below the upper end 39 of the vertically higher crosspiece 32 and rotated in the closed position.

Figure 4b shows the sliding of the distal upright with respect to the crosspieces 32 to move away from the proximal uprights 34; Figure 4c shows a partially open configuration for relative rotation between the crosspieces 32 and the uprights 34 in the transition between their minimum inclination and their maximum inclination in which they are orthogonal; figure 4d shows a further partially open configuration with a greater inclination between crossbars and uprights than the previous one. In partially open configurations, the locking elements 42 are free to slide and rotate with respect to the crosspieces 32.

Figure 4e shows the open configuration where the crosspieces and uprights have completed their rotation by placing themselves orthogonal to each other, and the distal upright 35 is translated into the desired position corresponding to one of the locking points 46 of each crosspiece. In this configuration, the locking elements 42 are locked both in rotation and in sliding with respect to the crosspieces 32.

In the open configuration of figure 4e the crossbars are arranged parallel and spaced apart in a vertical direction, and are absent from the upper end of the cage 14. Figure 4f shows the completely assembled counterframe 10 where it can be seen that the cage 14 is completed all the way. the upper end of the upper crosspiece 16, which is fixed (not rotatable) and is not part of one of the folding units 30. As it will be noted, the uprights 34 and 35 have at their upper ends elements for attachment to the upper crosspiece 16.

The counter frame can be completed with a bracket which acts as a reference thickness of the wall 54 (figure 3a and 3b) and / or as a connection between the upper crosspiece 16 and the stop upright 18.

The counter frame 10 is preferably arranged in a shipping and storage kit which comprises, preferably packed together, at least one cage 14 in closed configuration, at least one upper cross member 16, at least one abutment upright 18, and preferably at least one accessory spacing cross member 22 , where the cage, the upper crosspiece, the abutment upright and possibly the accessory spacing crosspiece 22 are separated from each other.

In use, the kit is assembled according to the following steps:

- the cage 14 is brought into an open configuration by moving the distal upright 35 to a desired locking point 46 corresponding to the standardized width of the counterframe to be made;

- the upper crosspiece, preferably complete with guide for the leaf, is joined to the upper ends of the uprights 34 and 35;

- the abutment upright 18 is joined to the upper crosspiece and its distance from the proximal uprights 34 is preferably fixed by means of one or more accessory spacing crosspieces 22.

The counterframe 10 thus made is particularly suitable for being covered with plasterboard or similar panels fixed to the crosspieces 32 of the cage 14.

Figures 8a and 8b show in detail a locking element 42 of the type used in the previous examples. It comprises a rotation pin 60 intended to define an axis of rotation X orthogonal both to the crosspieces 32 and to the distal upright 35. From one end of the pin 60 a shaped flange 61 is projected orthogonally to it with two main faces 62 and 63 parallel to each other. They. From the main face 62 facing the pin 60, one or more interference protrusions 49, preferably 2 diametrically opposed to each other, project parallel to the axis of rotation X.

The perimeter of the flange 61 is shaped to have one or more flat portions 50, preferably two, parallel and diametrically opposed to each other. The resulting shape could for example be a square with two edges replaced by two circular arcs to allow rotation. In this way there is also the advantage that the rotation is constrained in an angle of 90 °.

The snap device 50 comprises, for example, a pair of elastically retractable tabs 65 to hook a corresponding slot in the upright 35, which are not necessary, for example, if the locking element is in one piece with the upright.

Figures 9a to 9d show an example of crosspiece 32. It is for example a shaped metal extrusion with a substantially C-shaped section to create the rail-shaped guide 44 within which the flange 61 of the locking elements can slide and partially rotate. 42. The guide 44 in particular comprises two parallel channels 44a and 44b of width corresponding to the distance between the faces 62 and 63 of the flange 61 and with openings facing each other for the simultaneous insertion of said flange in both.

Along a distal portion of the rail 44, a plurality of notches are made in a predetermined position at the locking points 46. The perimeter walls 48 of the notches 46 act as interference elements for the projections 49 of the locking elements when they are inserted in said notches, thus preventing rotation of the locking elements. In moving from the closed (and mobile) configuration to the open (and locked) configuration of the cage, the projections 49 elastically expand the channels 44a and 44b until they fit into the notches 48 where they lock.

A further positioning aid is given by the flat walls 52 of the flange 61 which, in the locked condition, abut against the bottom of the channels 44a and 44b, preventing the rotation from continuing.

At the proximal end of the crosspiece 32 there is a coupling seat 70 to a rotation hinge for coupling to a proximal upright 34. The coupling is rotatable but not sliding, however, embodiments where it is also sliding are not excluded.

Figures 10a, 10b, 10c show an example of distal upright 35. It is for example a metal extrusion comprising a pair of channels 72 which act as retention and locking slots in rotation and locking elements 42. The channels 72 are for example C-shaped, parallel to each other, and open in opposite directions. The openings 74 are useful for inserting the elastic tabs 65 of the locking elements 42, which can also slide along the respective channel 72. The channels 72 prevent rotation of the tabs 65.

The channels 72 are spaced from each other by a wall 75 by a distance corresponding to the depth P of the cage 14.

Figures 11, 12 and 13 show the coupling between a crosspiece 32 of any one of the folding units 30 and the relative proximal upright 34.

As it will be noted, the upright 34 is integral in movement with a rotation hinge 80, made for example in a single piece with it. The hinge 80 for example comprises a pair of fins 82 projecting vertically and spaced from the main body of the proximal upright 34 in the direction of depth P thanks to a portion of the rotation fulcrum 84. This fulcrum passes through the seat 70 of the crosspiece 32 which is hooked by the tongues placed on its opposite side to the one facing the proximal upright 34. During the rotation towards the open position of the cage, the tongues 82 penetrate the channels 44a and 44b of the crosspiece 32, and their flat perimeter surface 86 must be pressed against the their bottom when an orthogonal rotation angle is reached, preventing further rotation.

The fins 82 can be such as to lock by interlocking in the channels 44a and 44b to also hinder the rotation in closing.

Figure 14 shows a variant of counterframe 110 made by coupling a further cage 14 to a frame 10 described above in place of the abutment upright 18, where the upper crosspiece 16 embraces both the cages.

Figure 15 shows the two cages 14 of the kit for constructing the counterframe of Figure 14 in closed configuration. They are the same as that of figure 5.

According to some less preferred but possible variants, the cage in the kit has the two folding groups 30 separated from each other and from the common distal upright 35, to which they will be assembled on site. In this case the channels 44 of the crosspieces 32 are open at the distal ends to allow the insertion of the locking elements 42.

In this variant the groups 30, in the kit, can also be separated from the accessory spacer post 22b. This makes the cage less bulky than the previous one to ship and store, but requires more assembly time.

What has been described and illustrated does not prevent the presence of other relative movements, such as for example a possible vertical translation of the distal upright 35 with respect to the crosspiece 32 to lower it in the closed configuration and raise it in the open one, and / or one or more translations of the proximal uprights 34 with respect to the crosspieces 32. The translation of the distal upright 35 remains the preferred one, allowing the adjustment of the width of the cage in an easy and practical way.

GENERAL INTERPRETATION OF TERMS

In understanding the scope of the present invention, the term "comprising" and its derivatives, as used herein, are intended as open-ended terms that specify the presence of the claimed characteristics, elements, components, groups, integers and / or phases, but they do not exclude the presence of other undeclared characteristics, elements, components, groups, integers and / or phases. The above also applies to words that have similar meanings such as the terms "including", "having" and their derivatives. Furthermore, the terms "part", "section", "portion", "member" or "element" when used in the singular may have the dual meaning of a single part or of a plurality of parts. As used herein to describe the form (s) above, the following directional terms "forward", "backward", "above", "down", "vertical", "horizontal", "below" and "transverse" as well as any other similar directional term refers to the embodiment described in operative position. Finally, degree terms such as "substantially", "about" and "approximately" as used herein mean a reasonable amount of deviation of the modified term such that the final result is not significantly changed.

While only selected embodiments have been chosen to illustrate the present invention, it will be apparent to those skilled in the art from this disclosure that various modifications and variations can be made without departing from the scope of the invention as defined in the appended claims. For example, the size, shape, position or orientation of the various components can be changed as needed and / or desired. The components shown directly connected or in contact with each other can have intermediate structures arranged between them. The functions of one element can be performed by two and vice versa. The structures and functions of one embodiment may be adopted in another embodiment. It is not necessary for all the advantages to be present in a particular embodiment at the same time. Any feature that is original compared to the prior art, alone or in combination with other features, should also be considered a separate description of further inventions by the applicant, including the structural and / or functional concepts embodied by those features. Therefore, the foregoing descriptions of the embodiments according to the present invention are provided for illustrative purposes only and not for the purpose of limiting the invention as defined by the appended claims and their equivalents.

Claims (11)

CLAIMS 1. Kit for making a counter frame for retractable sliding doors, where the counter frame (10) comprises a plurality of crosspieces (32) and uprights (34, 35) arranged to form at least one cage (14) which defines a housing compartment of a sliding door and an opening (17) for entry and exit from it, where the cage has a height in the vertical direction (V), a width in the sliding direction of the door (L), a depth in the orthogonal direction to the other two (P), said cage comprising two main sides (15a, 15b) facing parallel to each other and each having a development plane (z) in said height and width, characterized by the fact that in the kit said cage is separated from the other components of the counter frame and comprises at least two folding groups (30) which define said main sides, where said groups (30) each comprise a plurality of cross members and at least one upright and are foldable in said respective development planes between a in a closed position with minimum overall dimensions in width and an open position with maximum overall dimensions in width thanks to the relative rotation between the crosspieces and the upright in said plane, and where the cage (14) is lockable in the open configuration. 2. Kit according to claim 1, characterized in that, with reference to the distance from the inlet and outlet opening (17), the cage (14) comprises at least one distal post (35) and a pair of proximal posts (34) , where each proximal post belongs to a folding group (30) and the two proximal posts are spaced from each other in the direction of depth of the cage to define the opening 17, where the distal post (35) joins and distances the two folding groups. (30) and in the kit it is joined or joinable to the folding groups (30) in a way that can be rotated simultaneously with respect to the crosspieces (32) of each group and can slide with respect to them (34). 3. Kit according to claim 2, characterized in that the distal upright (35) is sliding at least towards and away from the proximal uprights (34), and is lockable in rotation and sliding with respect to the folding assemblies (30) in any one of a plurality of predetermined locking points arranged along said sliding direction. 4. Kit according to claim 3, characterized in that the locking points (46) are snap locking points, where the locking of sliding and rotation occurs when a predetermined angle of rotation is reached between the crosspiece (32) and the distal strut (35). 5. Kit according to claim 3 or 4, characterized in that it comprises at least one rotation, sliding and locking mechanism (40) between at least one cross member (32) of a folding assembly (30) and the distal post (35), where the mechanism includes: - at least one locking element (42) integral in movement with the distal upright (35) and sliding and rotatable with respect to a guide (44) of the crosspiece (32), where the locking element is lockable in rotation and sliding with respect to the crosspiece in said predetermined points (46). 6. Kit according to claim 5, characterized in that: - the locking element (42) comprises a rotation pin (60) intended to define a rotation axis (X) orthogonal both to the crosspieces (32) and to the distal upright (35), from one end of the pin (60) a flange (61) is projected substantially orthogonally thereto which has one or more engagement elements, for example protrusions and / or notches (49); - the crosspiece (32) has a substantially C-shaped section to create a rail-shaped guide (44) within which the flange (61) of the locking element (42) slides and rotates, along the rail (44) are made a plurality of engagement elements (48) complementary to those of the pin in correspondence with the locking points (46), for example notches and / or protrusions, where the engagement elements (48, 49) provide snap locking when they couple due to this rotation. 7. Kit according to any one of claims 3 to 6, characterized in that in the kit: - the folding groups (30) and the distal upright (35) are joined together to form a pre-assembled cage unit (14) closed and ready to open, - the crosspieces (32) of the folding groups can be rotated with respect to the distal upright (35) and to the respective proximal uprights (34), - the distal upright (35) is translatable with respect to the crosspieces (32) of the folding units; - the cross members (32) of the folding groups are free to rotate from a closed cage configuration to an open cage configuration, and abut against stop elements (42, 49, 52) when the open configuration is reached; - the pre-assembled unit (14) comprises rotation and translation locking elements, they are snap-on and are activated when both are reached between the open configuration and a translation position of the distal upright selected from a plurality of positions corresponding to predetermined widths of the open cage. 8. Kit according to any one of the preceding claims, characterized in that each folding group (30) comprises a proximal upright (34) to which a plurality of crosspieces (32) are rotatably joined, where in the kit the top end of the groups is without crosspieces (32). 9. Kit according to claim 8, characterized in that the groups (30) are joined and spaced apart by a distal upright (35) which can be rotated and slidable with respect to at least one crosspiece (32) and in the kit in closed configuration said distal upright (35) is translated with respect to said cross member (32) in a position in which its top end is below or substantially at the top end of at least one cross member (32) of the groups rotated in closed configuration. 10. Kit according to claim 8 or 9, characterized in that it comprises an upper cross member (16) separated from the groups (30) and which can be joined fixed at their upper end when they are in the open position to become the missing upper cross member of both folding groups (30). Kit according to claim 10, characterized in that the upper crosspiece (16) protrudes from the cage in the direction of the width of the counter frame to overcome the door passage opening (20) and to support a sliding guide of the door.