MXPA04000921A - Stacking tray. - Google Patents

Abstract

The present invention refers to containers and, more particularly, to trays that may be arranged at intervals ranging from about 0¦ to about 180¦, said rotation being useful for obtaining different height positions. The trays comprise ergonomic handles useful for the user to detect the correct way of the tray to be stacked or stowed or nested, depending on the needs; a double guide at the leg base of the tray for avoiding separation of the legs apart from each other upon stowing the trays; a double slide or rail located along the sides of the trays for sliding a slipper and avoiding displacement of the trays; anchoring means (male-female) for ensuring the upper trays to remain coupled during abrupt moves and allowing the trays to be stacked at different heights. The invention further includes stops or protuberances at the upper and lower portion of the tray for preventing the upper trays from freely sliding along the rail or rib of the lower tray, depending on the position of the same .

Description

STACKABLE CHAROLA FIELD OF THE INVENTION The present invention relates to stackable containers and more specifically with stackable trays for storing or transporting articles or products with different dimensions, which can be rotated and placed one on top of the other in a secure manner according to the dimensions of the product or article to be Stored or transported.

BACKGROUND OF THE STATE OF THE ART It is known that one of the main problems that currently exist in warehouses or means of transport is the space needed to store or transport as much as possible of items or products, without detriment to them. To this end, users have developed or required expert companies in the field, the design of containers or containers that according to their needs allow them to store or transport their products or articles in a safe manner.

It is widely known in the field of packaging, storage and transport means that space or space saving is achieved when stowing or stacking containers or containers. However, in order to carry out the stacking or stacking it is necessary to consider their subsequent handling and the type of articles or products that will be stored or transported in the containers or containers, as well as their subsequent storage and transport when they do not contain any product. Some of the many factors that have been considered for the design of such containers or containers, is the height of the articles or products to be stored, transported or distributed, the weight of the product that the container or container must bear, the characteristics of the place or places where articles or products will be stored, transported or distributed, the conditions under which it will be handled by the operator or vendor, the conditions of the road through which it will be transported, and its subsequent stacking once it has been emptied, even cleaning and washing, etc. One of the main techniques that have been used for the stacking of containers or containers is the so-called "nonability" which consists of stacking the containers or containers at different angles to achieve a minimum height and a maximum height (see for example the US Patents Nos. 3,780,905 by Ralph H. Herotzer); 3,934,724 to Lewis T. Johnson; 4,577,759, Pinckney Molded Plastics, Inc .; and 4,320,837 to James C. Carrol et al.

US Patent No. 4,936,458 to Tabler, et al. Discloses a tray that can be nested at 90 °, or stacked at 0 ° or 180 ° by the use of feet and rails and also describes a possible "blind" stacking by the cooperation of elements. of lace. It also describes the use of trays at different heights for stacking, however, it does not consider cross-nesting between trays of different heights.

U.S. Patent No. 6,394,274, Pinckney Molded Plastics, Inc. (Howell, MI), discloses a pan for bread, stackable on an identical tray that provides three storage levels, which are achieved by rotating the trays at a certain angle, depending if it is to be nested or stacked. In this patent, cross-piling is considered. However, this patent has the disadvantage that when there are sudden movements due to operator handling, the upper trays are easily uncoupled from the lower trays causing the product to be damaged and not accepted by the buyer, in addition to the trays having a very short sliding rail that does not allow a quick alignment during the sliding action and even causes the trays to disengage easily. The trays include handles that could damage the operators or that simply are not comfortable to them for a better handling of the same, they are not designed to support the rough handling by the operators and the conditions that appear in the roads with potholes, dirt, sinuous, etc., which causes that its useful life is reduced in a considerable way and that the trays are decoupled during their transport by said roads, which can cause damages and rejections in the transported products; the possible marks that contain the trays to indicate to the operator the angle to which they are stacked disappear quickly by the daily use and frequent cleaning to which the tray must be subjected, especially when it is used to transport food products that require minimum levels of hygiene, causing loss of operator's time to identify if the tray is stacked or nested; The multicolored trays include slits or small holes in the ribs in which small portions or the product could be lodged, which could decompose, and sometimes said slits or holes could even cause a poor cleaning of the tray. It should be mentioned that due to its design it might not be possible for a person with a disability to manipulate it. The stop portions used for when the tray is placed in a crossed position are not adequate enough to prevent the tray from leaving its "stability" position, causing, if it is the case, that some product be damaged when leaving the tray. Likewise, said tray does not have a male-female fitting that in the stacking position allows the securing of the upper tray on the lower one. Furthermore, the design of this tray does not allow the stacking of a tray of different width on the lower tray or does not contemplate the combination or alternation of trays with different width during the stacking action.

A further disadvantage of the tray of US Pat. No. 6,394,274, is that there is a risk that the rail or guide of sliding of the legs as well as the sides and handles, deform or break in a short time due to the rough handling made. by the operator or even by the weight of the product plus the weight of each tray stacked.

Another disadvantage of the trays of the prior art is that when an operator accidentally leans on the trays then there is a risk that the trays overturn by not having a support that prevents the effect of rocking on one of its sides, in addition the height of the space between tray and tray changes when making the rotation of them to move from a nesting to stacking position.

BRIEF DESCRIPTION OF THE INVENTION The present invention is directed to solve the aforementioned problems. Therefore, it is an object of the invention to provide a container or container, specifically a stackable or nestable tray, for the storage or transport thereof or products to be stored or transported on said tray, which has a long shelf life. even under rough working or handling conditions, which is achieved by a conformation of the structural elements, for example, guide or sliding rail, corners, male-female fittings, and chamfered corners, which shaping avoids the concentration of stresses normal load or excess load. In order to arrive at this conformation, the conditions of use to which the trays would be subject, such as, for example, drag force, overload, type of transport to be used and roads through which the transport must transit, as well as handling, were considered. Carefully or without care, carried out by different operators, including those operators that will come to present a disability.

Another object of the invention is to provide a container or tray or tray with ergonomically designed hand grips to provide greater comfort and safety to the operator, so that the product contained therein receives a better treatment during the handling of the tray. The design of these handles contemplates a series of borders or fillets which makes them more resistant to dragging actions, which considerably increases the useful life of the trays.

It is another object of the present invention to provide the trays with differentiated handles that allow the operator, even by touch, to quickly and easily identify the correct side for stacking, stowing or nesting the trays as desired.

Still another objective of the present invention is to provide the tray with a double guide or rail at the base of the legs, in the manner of a "skate", to give greater adjustment and fixation of the trays, thereby avoiding the separation thereof. during sudden or sudden movements when they are stored or transported. The double guide or lane is located along the sides of the trays, to allow the movement of the legs with greater security to avoid that the trays are uncoupled or leave their site during transport or handling in addition to preventing the same The legs of the tray exert a force such that the guide or rail is deformed or even broken due to the weight or overweight of products that are received, contained, transported or housed therein.

It is another object of the present invention to provide a stackable or nestable tray or one that is capable of being arranged crosswise over another, which can be manipulated by a person with a disability, which is achieved by means of the novel design of the tray described later.

Still another objective of the present invention is to provide trays with smaller width, without this being a limitation, that can be stacked on another tray that has a greater width and that can also be combined or interleaved, to store products of smaller dimensions or capacities different BRIEF DESCRIPTION OF THE FIGURES Figure 1 is a perspective view of the tray for transporting or storing articles or products of the present invention.

Figure 2 is a top view thereof where pairs of different recesses are observed at the corners.

Figure 3 is a bottom view of it.

Figure 4 is a side view taken from the right side where the distribution of the handles, the arrangement of the legs corresponding to that side and the chamfering of the different elements that comprise it are observed.

Figure 5 is a left side view thereof showing the handles of the tray, one ergonomic, and the other two with different slopes; and its legs.

Figure 6 is a front view thereof illustrating the different male-female fitting elements and the arrangements of the portions for carrying out the stacking or nesting of the trays and guides or sliding rails. Also shown in this view is a concave upward portion disposed approximately in the center.

Figure 7 is a rear view thereof illustrating the different male-female fitting elements and the arrangements of the portions for carrying out the stacking or nesting of the trays and the sliding rails. The concave portion of Figure 6 is not included.

Figure 8 is a view illustrating two trays arranged in a cross-shaped manner in which the lower part of the upper tray shows protuberances which serve as a stop for said tray to restrict its sliding movement.

Figure 9 is a front view illustrating two trays in the nesting position.

Figure 10 is an enlarged view of the section A of Figure 9 illustrating the legs, guides or rails and the male-female fitting elements.

Figure 11 is a view illustrating two trays in the stacking position.

Fig. 12 is an enlarged view of section B of Fig. 11 illustrating the connection or assembly between two trays in the stacking position.

Figure 13 is a perspective view of a second embodiment of the tray for transporting or storing articles or products of the present invention.

Figure 14 is a front view illustrating the stacking of two trays of the second embodiment on a tray of the first embodiment.

Figure 5 is a perspective view of a third embodiment of the tray for transporting or storing articles or products of the present invention.

Figure 16 is a front view illustrating the stacking of a tray of the first embodiment on two trays of the third embodiment.

Figure 17 is a view of an insert that can be embedded in front of one of the short sides in height DESCRIPTION OF THE INVENTION.

With reference now to the figures, in figure 1 it is observed that the container, container or tray 1 is shaped similarly to a drawer, which includes two short sides in height (2) and two long sides in height (3) and a floor element (4) which may have different design patterns, or without patterns, or be perforated or uniformly solid, if any, although it is preferred that it be perforated to allow ventilation when the products are for example perishable, bread , etc. The long sides in height have channel-shaped slides to allow the sliding of an upper tray to be stacked, recesses and coupling elements to allow nesting or stowing an upper tray (see figures 8, 9 and 11) resulting in the spaces with different heights depending on the rotation needed of the trays to store products of different height, which allows optimally take advantage of the system placing large or small products in an agile and safe way. The above is also advantageous when forming tray towers.

As it is also observed in figure 1, the container, container or tray of the present invention has two handles or handles (5) at the center of each side, which could be called the equilibrium point of the tray, which have been structured and reinforced by vertical ribs and ribs (6). ), arranged in spaced form one and the other so that they can create a virtual surface grip, comfortable that allows to safely take the tray through the middle part of your own body, which is a point of balance.

These ribs and vertical ribs (6) considerably increase the mechanical strength of the section of the handles, which prevents the handle or handle from being deformed or even broken when the trays are eventually pulled by a hook, either alone or in towers, which in the great majority of occasions is a practice in the maneuvering yards. The approximate weight that supports the bottom tray of a tower of trays before its deformation or breaking is approximately 410 to 420 kg.

The handles (5) are differentiated from one another by the lower silhouette (7) (this is the face that appears towards the flat surface of product loading), which is where the palms of the hands rest. One is provided with a series of horizontal waves where the fingers can be comfortably located; the other is a curved convex line that simply receives the fingers and the palm of the hand; in this way it is that by simple touch they allow to locate and orient the sense of the trays, that is to say to know immediately if that tray can be "stacked" or "nested" in another immediately inferior. During the working day it is very important to provide the operator-user of the trays with this conformation, because in this way their task is significantly streamlined as well as minimizing the possibility of error when placing a tray with respect to the immediate lower one, wrong way It is important to point out that all the inner joining lines (8) of the floor with the sides are slightly rounded (in figure 1 only three are shown) in order to allow a better cleaning of the tray since with corners completely at right angles Most of the time, there is waste of product or grease or dust trapped between them and to avoid stress concentration.

The structural elements (9) are designed to give greater resistance to the tray and saving material for its manufacture. It should be understood that multiple configurations of these structural elements (9) may be possible.

The tray (1) has been provided with four handles at the ends, one at each end of each long side in height (3) (those existing in the market do not have any). Two of them are approximately vertical (11), arranged very close to the edge, and allow the user to also identify by the touch of the side on which the tray is located (if it is in the direction of being spreaded or stacked) to take it safely, comfort and ease the tray especially when it is necessary to raise it above the level of the operator-user's head and two other inclined handles (12) towards the inside of the tray. These inclined handles (12), contribute by their angle of attack to differentiate and distinguish again the orientation of the tray with respect to the immediate superior in which it will be placed, allowing to recognize and know if in that direction the tray (1) it will be stowed or nested on a lower tray (see figures 9 and 11).

Also the inclined handles (12) allow for its angle, to better support the tray and its contents, helps to exercise an appropriate lever arm when the trays are stowed or nested above the visual level of the operator, allowing to exert sufficient force and support the tray in "cantilever" during the operation that is required to perform at the time of alignment and support at the ends one tray with respect to the other. This design of handles is also useful when you want to handle trays not only in maneuver yards or work areas in the factories, because it is common that there is the need to place and slide trays inside transport vehicles, places that normally they have little drive space, which makes it more difficult to stow and nest trays (for example inside a cargo truck, or a "vanette" type truck).

Figure 2 shows recesses or female sockets (12) arranged in each long side in height (3), next to the approximately vertical handle (11) so that the simple legs (14) (see figure 3) fit like a male during the nesting position. There is a guide or double rail or discontinuous composite rail (13) on each long side in height of the tray, which serves as a slide or support for the compound legs (15) (see Figure 3 for the stacking position). . It should be noted that the simple legs (14) can also be slid over the double guide (13) prior to fitting or engaging in the recess or female socket (12). In this case the simple legs (14) having a portion recessed to a height such that it allows its free sliding in a secure manner, slide through the channel formed by the parallel flanges of the guide or double rail before fitting into the recess or female socket or they can be fitted directly by the operator. One of the sides (2) has a series of holes (16) to receive a plastic part insert (17). The guides or double rails (13) are necessary elements for the proper use of the system of nesting and stacking of trays; these elements have been rounded off at their ends in order to allow the legs of the tray to be aligned and centered more adequately.

Figure 3 illustrates the recessed portion of the simple legs (14) and recesses or slits made on the compound legs (15), which allow their sliding on the guides or double rails (13). Around the surface are distributed in a spaced form a series of holes to allow the waste of the materials to fall. The narrow part has a height greater than the wide part to allow the trays to be transported or lifted by a lifting device, such as a forklift.

Figures 4 and 5 show the spatial arrangement of balance point handles (5), vertical handles (11) and inclined handles (11 '). Figure 4 shows in greater detail the silhouette (7) of one of the handles (5), which corresponds to that of the curved convex line, on which the fingers and the palm of the hands are simply coupled for comfortable handling of the tray. Figure 5 illustrates in more detail the silhouette (7) of another of the handles (5) corresponding to that provided with corrugations on which the fingers and palm of the hand are placed comfortably. All the corners that could have contact with the operator-user have been chamfered or rounded to avoid damage to the body of the operator-user. The lower part of the space formed by the balance point handles are rounded for a better distribution of the weight forces exerted on the tray.

Figure 6 illustrates two vertical structural elements (18) in the manner of support legs that act as registers, which in addition to falling located in a hole or slot that receives them, securely and securely lock the two trays in question, which they are located on one of the short sides in height (2) that includes the holes 16 (see figure 2). It is important to emphasize that these elements are not constituted as load carriers, but that they are only registered.

When the trays are "nested", these vertical structural elements are constituted as a fundamental guide that in addition to tying and registering both trays (see figure 9) exert a lock effect that locks the corners (the 4) when they have nested, avoiding they are deformed, they open up or even if they get to "unravel" they collapse with each other. The vertical structural element (18) is fitted or nested in an inner groove (19) which is located on the side of the compound legs (15).

Figure 6 also shows the double guides or rails (13), upper part, and the compound legs (15) as well as projections (20) that in the stacking position receive the vertical structural element (18) and could even be serve as support for it. Additionally, a recess including ribs or reinforcements (21) for receiving a plastic part insert (17) is shown.

Figure 7 is a view similar to that of Figure 6 but with the exception that this side does not have holes (16) nor does it present the recess for inserting the insert of the plastic part (17) (see Figure 8? ).

Figure 8 illustrates an assembly of trays (10) in which the upper trays are in a crossed position with respect to the lower tray. The upper trays are in the stacking position. It should be noted that in order to prevent the upper tray from sliding during the cross-over position, the tray includes protrusions (not shown) in its lower part that serve as a stop or restriction element of movement.

Figure 9 illustrates an assembly of trays (10) in the stacking position in which it is shown how the vertical structural element (18) engages with the projection (20), and the simple legs (14) engage with the double guide or lane (13). In this position the useful height for storing or transporting products increases.

In figure 10 it shows in an amplified form the leg (15), which slides and locks on the double guide or rail (13) during the stacking operation, the projection 20 on which the vertical structural element (18) could rest. in the stacking position.

In figure 11 two trays are shown in the nesting position, which can be easily identified by the position in which the recess for plastic insert (lower tray) is located with respect to the upper tray. Figures 13 and 14 correspond to a second embodiment of the container container or tray of the present invention and to the stowing of two longitudinal trays on a tray (10) of different size, respectively. It should be noted that in this case the stowage could start with two longitudinal trays as a base. During the stowage it is possible to combine the placement of the trays, that is to say first two longitudinal and a normal tray and after x stacked trays to re-stow the longitudinal trays.

Figures 15 and 16 correspond to a third embodiment of the container or tray of the present invention and to the stowing of a tray (10) of the first embodiment referred to above on two transverse trays of the third mode of different measurement, respectively. It should be noted that in this case the stowage can start with two transversal trays as a base to place a normal tray, not being possible to place trays on the normal trays.

Figure 17 illustrates a token or identifying element that helps to differentiate and identify the sense of the trays, which consists of a piece in the form of a half circle that is inserted mechanically and then heat in the recess (22). In its upper part has four extensions that end in a flat horizontal surface with respect to the main plane of the component, these four circles in turn are inserted into four circular holes specially provided to receive them. When a tray is seen from a high part, it will always be possible to identify its position with respect to the others, also when being seen a tower of trays in front you can determine its position. This piece also has the possibility of incorporating brands, logos and other distinctive signs that can identify the manufacturer of the product stored or transported.

The design of the containers or trays or trays has been carried out in such a way that they are already "nested", "stowed", "cuatrapeados", with each other, always uniform useful distances are conserved. It means that the separation between the two when changing the arrangement from one form to another does not affect or modify the useful storage distance that must exist, keeping it fixed. The above is important, since it allows to plan in a safe way the disposition and distribution of objects or products to be transported and stored; because when the useful space available is guaranteed, and knowing that it will not change, a distribution and planning of product storage can be done in advance.

Another important characteristic of the tray of the present invention is greater load capacity, achieved by the reinforcement and adequate distribution of the ribs that structure the four sides; the lengths in height are those that have the function of supporting the weight of the towers of trays full of product, these have been configured in such a way that through a system of ribs generate a solid and rigid block capable of supporting loads of up to 450 kg .

Due to the shape and design of the four corners, it has been possible to join the short sides in height with the long sides in height, generating two angles and corner finishing capable of supporting both loads up to 450 kg., As milestones to be dragged up to 200 kg.

Operation of the double guidance system.

There are four parts located (two and two) on the short sides in height of the tray, these legs are different from each other, with those directly below the vertical slot on one side serving as a guide, support and retainer . They are constituted as a set of double and parallel skates that when they slide along the guides, serve first as a guide to maintain the correct direction of displacement of the upper tray that is being placed in a lower tray in order to be " stowed. " On the males in which these skates have become, the weight of the tray that is sliding over the immediately inferior tray is loaded, the same happens with the simple skids of the other two legs.

These double skids, also function as limit stops that prevent deforming the sides of the trays, to "tie" and support through a padlock effect between the outer skate and the inner rail an unwanted displacement. The above is complemented by the double guide that is configured by two long and parallel elements inside and on which act and describe the aforementioned skates.

Along the gap generated by the rails, small "unidirectional lugs (not shown in the figures)" were placed, which only allow the movement in only one direction, thereby locking the legs in place when they have finished their travel.

The hind legs (two are located exactly below the inclined handles, which play a similar role and complementary to that of the front legs, only that these are simple and not double, having the ability to record to be nested trays in their respective boxes.

The superelevation and depth with which all these elements have been designed, is such that it guarantees its stability, since it is not possible to zafarlos them or that they "jump" and leave their channel due to an unwanted jump due to the effects of a bump in the irregular roads and highways of our country.

With the above, it was also sought to ensure that the operator located in a simple and quick way the entry and then a smooth, continuous and safe movement of the parts of the tray that is placing, with respect to the bottom, in addition to making it very difficult to jump and zafen more trays, causing breakages and product losses.

As mentioned above, the tray includes short sides in height deformed by a long curve that causes a long window between the trays, being stacked or stowed, thus leaving the possibility to easily see the contents of each of the trays, without need of having to raise them or raise them one with respect to others to be able to see inside them.

Although all the features and fundamental features of the present invention have been described here, with reference to particular embodiments thereof, a latitude of different modifications, changes and substitutions are proposed in the foregoing description and it will be apparent that in some instances, some features of the invention will be employed without corresponding use of other features, without departing from the scope of the invention as set forth. It should be understood that such substitutions, modifications and variations may be made by those skilled in the art without departing from the spirit or scope of the invention. Accordingly, all modifications and variations are included within the scope of the invention as defined by the following claims.

Claims (33)

CLAIMS Having sufficiently described the invention, it is considered as a novelty and the content of the following clauses is therefore claimed;

1. Stackable or nestable tray, for transporting and / or storing articles or products of different dimensions, which can be stacked on another identical tray or on trays of different dimensions but with coupling elements to carry out the stacking or nesting in stable form and safe, which includes: A flat floor surface that can be closed or open showing different patterns of figures, which serves as a support for products or articles, which unites the four sides of the tray; two of the sides of the tray, sides long in height, have handles distributed in spaced form, and one of the two remaining sides, short in height, the front, has a portion upwards, while the other side short height, the posterior one is molded in a continuous way; in the lower part of each of the lateral sides are integrally arranged two legs, simple and compound, a guide or rail being also arranged for its sliding, wherein the legs allow stacking or nesting at different height levels, according to the rotation that is given to the tray; the tray comprises a double guide or rail to allow the safe sliding of the upper tray whose legs are coupled to the guide or rail, with protuberances or "unidirectional lugs" being provided at the ends of each side to only allow the sliding in only one sense; a portion of a male fitting for fitting or assembling in a female socket portion located in the upper part of the lower tray; In addition, protuberances or protrusions provided in the lower part of the trays are provided which function as a stop element when the trays intersect.

2. The tray according to claim 1, characterized in that the handles are three in each long side in height, a central balance point, a vertical and an inclined, for easy handling of the tray.

3. The tray according to claim 1, characterized in that one of the center handle of equilibrium point on a long side in height has an ergonomic shape and the other central handle of balance point located on the other side long in height has a curve convex

4. - The tray according to claim 1, characterized in that the handles located next to each of the ends of each of the long sides in height, one is inclined inward and the other is approximately vertical.

5. - The tray according to claim 1, characterized in that the guide or rail is double, the inner part being in section and the outer part continuous.

6. - The tray according to claim 1, characterized in that the outer part of the double guide has two "unidirectional lugs" that only allow the displacement in one direction of an upper tray.

7. - The tray according to claim 1, characterized in that the female fitting portion located in the upper part of the lower tray is a recess formed in the inner part of one of the short sides in height.

8. - The tray according to claim 1, characterized in that the male fitting portion is a vertical structural element located on the other side of the short height.

9. - The tray according to claim 1, characterized in that the lower part of the tray has two projections that serve as a stop when the trays are in the crossed position.

10. - The tray according to claim 1, characterized in that the composite legs that are located below the handle approximately vertical form a set of double and parallel skids that when sliding along the rail of the double guide, function first as a guide to maintain the correct direction of displacement of the upper tray and to achieve the desired position become supports and reinforcements for the guide.

11. - The tray according to claim 1, characterized in that the simple legs that are located below the inclined handles are capable of being nested in recesses or female sockets located on the inside of the tray, close to the handle approximately vertical.

12. - The tray according to claim 1, characterized in that it has projections located at the corners, which function as a guide and support for the simple or compound legs.

13. - The tray according to claim 1, characterized in that all the corners with which the operator-user has contact are rounded or chamfered.

14. - The tray according to claim 1, characterized in that the upper ends in. alignment with the compound legs, have a recess that functions as stopping element of the tray in the stacking position.

15. The tray according to claim 1, characterized in that in the front recess with ribs that is located on one of the short sides in height, a plastic insert can be embedded to reinforce said side.

16. - The tray according to claim 15, characterized in that the plastic insert has a half circle shape that includes four extensions that end in a flat horizontal surface with respect to the main plane of the component.

17. - The tray according to claim 15, characterized in that the insert can be recessed mechanically and subsequently applying heat.

18. - The tray according to claim 15, characterized in that the extensions of the insert are fitted in the holes located in the upper part of one of the short sides in height.

19. - An insert for embedding in one of the short sides in height.

20. - the insert according to claim 19, characterized in that it is embedded mechanically and subsequently applying heat.

21. - The insert according to claim 19, characterized by the four extensions coupled in the four holes of one of the two short sides in height.

22. - Assembly of trays, characterized in that it comprises male-female fitting elements, support elements, guide elements, slide elements, handle elements and stop elements, which are connected together to prevent the upper tray from "jumping" "," zafe ", slip involuntarily or fracture during handling or use.

23. - Middle longitudinal tray characterized in that it has the necessary elements to be coupled individually or in pairs to the tray of the claim.

24. - The tray of claim 23, characterized in that it can be interposed between trays of claim 1 without changing the height levels between each tray when changing its rotational position.

25. - Combined assembly of the tray of claim 1 and claim 23.

26. - Middle transversal tray, characterized in that it has the necessary elements so that a tray of claim 1 is stored on it.

27. - Combined assembly of the tray of claim 25 and the tray of claim 1.

28. - Combined assembly of the trays of claims 1, 23 and 26.

29. - The tray of claim 1, characterized in that the handles are designed to allow a disabled person to manipulate it.

30. - The tray according to claim 1, characterized in that the structural elements allow to have a prolonged useful life thereof.

31. - The tray according to claim 1, characterized in that the inner corners of the tray are slightly rounded or chamfered to prevent accumulation of product waste, grease or any other undesirable matter.

32. - The tray according to claim 1, further characterized in that the short sides in height do not allow the accumulation of undesirable material in the tray.

33. - The insert according to claim 19, characterized in that it has a useful surface on which they can be placed, labels, marks, logos and other distinctive signs.