Abstract:
A collapsible crate is formed by separate long side wall members, short side wall members and a bottom member. The members are made of lightweight plastic material and include respective tongues and slots for interfitting the members to assemble same without need for a tool. The members are of lattice construction and have strips with flat inner surfaces.

Description:
BRIEF SUMMARY OF THE INVENTION 
     This invention relates to callapsible plastic crates or boxes for the display and transport of perishable goods. 
     The object of the invention is to provide a crate or box which can be made from plastic components. 
     According to the invention, there is provided a collapsible box or case whose sectional components interfit with one another by means of slots, studs and tongues, the sectional components being of latticed or cellular or open mesh work construction ensuring the conveyance, storage or display of the commodities without risk of spoilage, while also providing easy transportation of the lightweight components of the case when delivered flat and its quick, safe assembly without the use of tools. 
    
    
     BRIEF DESCRIPTION OF THE DRAWING 
     FIG. 1 is a diagrammatic perspective view illustrating one embodiment of the casing according to the invention; 
     FIGS. 2, 3 and 4 are sectional views respectively taken along lines 2--2, 3--3, and 4--4 in FIG. 5 showing the assembly of the case; 
     FIG. 5 is a perspective view of a case in accordance with the invention; 
     FIG. 6 is an exploded view of the separate components of the case according to one variant; 
     FIG. 7 is a transverse sectional view of a long side element of the variant as shown in FIG. 6; 
     FIG. 8 is a transverse section view of a short side element of the variant as shown in FIG. 6; 
     FIG. 9 is a perspective view of a modified version of the bottom of the case; and 
     FIG. 10 is a longitudinal sectional view, on enlarged scale, of the bottom of FIG. 9. 
    
    
     DETAILED DESCRIPTION 
     As shown in FIGS. 1-4, the case is composed of a bottom member F 1 , two short side members F 2  and two long side members F 3 . The members F 1 , F 2  and F 3  grid-like members of lattice construction. 
     The bottom member F 1  includes a peripheral projection P 2  which is inserted in a slot R provided in member F 2 , such that projection P 2  rests on a lower angle member A 2  bounding the slot R. 
     The side members F 2  and F 3  are interengaged as shown in FIG. 3. Therein, it can be seen that side members F 2  are formed with slots R along the side edges facing side members F 3 , and side members F 3  have tongues L entering slots R. The side members F 2  are formed with studs T in slots R, and at least some of the tongues L are provided with apertures A 3  in which the studs T can be engaged. 
     The longitudinal and transverse strips of the latticed side members are of T-section or U-section, and for the bottom member of T-section. 
     The side members and bottom member are reinforced by angle brackets S as shown in FIG. 5. 
     In assembled state, the vertical corners of the case are composed of three thicknesses of material, viz., two thickness for slot R and one thickness of tongue L, this providing an increased rigidity which assures strength and stability for the entire case. 
     The members F 1 , F 2 , and F 3  are flexible, and the slight flexure of the bottom member under the weight of the load in the case tends to apply the side members against the load in the case. 
     Referring next to FIGS. 6, 7 and 8, therein is shown a case whose member 1 is similar to the member F 1  in FIGS. 1-5. The member 1 can also be of a different construction as seen in FIGS. 9 and 10 and as will be described later. In the embodiment shown, the bottom member 1 is composed of a molding with an outer peripheral section 1a with a top which forms longitudinal tongues 1b and transverse tongues 1c. The bottom member 1 is formed with longitudinal strips 1d of T section and flat transverse strips 1e suitably arranged to give a latticed, unwarpable supporting surface. The bottom member may also be formed of very long strips of U channel section for receiving larger products. 
     The case has short side members 2 and long side members 3. The short side members 2 are molded with a peripheral rim 2a having a slot 2b on three sides adapted to receive on the one hand the tongue 1c from the bottom member 1 and, on the other hand, a tongue from the long side members 3. 
     The side members 2 are formed with horizontal strips 2c of U-shape cross-section, adjacent strips defining an empty space E therebetween. The strips 2c are suitably strengthened, at the middle thereof with upright sections 2d of U-shape cross-section. 
     Above the uppermost strip 2c, there are secured vertical strips 2e defining an open central space E1 for picking up the case. 
     The long side members 3 are formed of vertical end strips 3a. Longitudinal srips 3b are arranged horizontally in vertically spaced relation to define spaces E2 therebetween as seen in FIG. 6. The strips 3b are reinforced by vertical strips 3c suitably spaced along their length. The strips 3c are of U-shape cross-section. 
     The upper end of side plates 3 can be built up with sections 3d permitting a fuller loading of the case. 
     The end strips 3a each carry a tongue 3e with notches 3f formed in the side edges thereof. The strips 3a are also formed with apertures 3g for engaging inside studs formed in the slots 2b in the side members 2 to ensure safe and non-collapsible assembly. 
     The U-shaped strip 3b located at the bottom of side member 3 forms an angle brace or horizontal tongue 3h on which the tongue 1b of the bottom member 1 rests on assembly of the case. 
     Reinforcing brackets can be molded at the bottom corners of the long and short side members 2 and 3 if required. 
     The thus constructed and assembled case rests with stability on sections or projections 3i on the long side members, on a tongue 2f of the short side members and on the peripheral section 1a of the bottom member 1. 
     With a base so constructed, it is understandable that some form of intermediate slat is required when small sized products are placed in the box. 
     When it is desired to display and transport larger products, especially fruit such as peaches, apples, oranges, etc., a bottom member as illustrated at 5 in FIGS. 9 and 10 can be utilized. Therein the strips forming the lattice is replaced by a sheet member 5a having a plurality of pockets or cups 5b corresponding to the size of the fruit. These pockets can be provided with a number or small-diameter holes 5c or slots so as to permit satisfactory ventilation or &#34;breathing&#34; for the product. 
     In this type of manufacture, the box is generally smaller in height (forming a tray) and receives only one layer of the product. Nevertheless, there may be provided, at various points along the height of the long side members, brackets or slots for supporting a plurality of sheet members 5a in vertically juxtaposed relation. 
     In the non-limitative illustrated embodiment, the flat or cupped bottom member is independent from the other members. However, a flat or cupped bottom member can be made integral with two opposite side members. In such case, the same manner of assembly is employed. 
     Of course the sizes and shapes of the various members forming the box can be arbitrary in number and type, arranged any way, provided they obtain satisfactory rigidity and suitable capacity in the box. 
     It is to be noted that the horizontal strips 2c and 3b, and optionally similar strips on the bottom member, are to be sufficiently wide to receive products such as pears, grapefruit, tomatoes, melons, etc., without damage against the sharp edges of the strips during transport. 
     The members forming the box are obtained by injection molding of a suitable plastic which can be colored in mass. 
     The case of the invention allows the stacking of at least 10 cases of 15 kilos thus complying with acceptable standards for all dimensions. By way of illustration, the box weighs less than 20 grams per cubic decimeter capacity. The wholly collapsible box can be delivered flat, in contrast with wooden packings customarily used for transporting and displaying perishable goods. The box is lighter than these latter and can be manually assembled without need of a tool. The box is rot-proof, lightweight, compact when dismatled and rapidly assembled, and is usable for shipment of young vegetables, in truck gardening, for shipment of perishable goods, and generally for boxing foodstuffs such as fruit, vegetables, fish, breads, meat, etc. The construction of the box of section members, with flat inner surfaces and a cupped ventilated bottom member allows the shipping, storage and display of delicate products without risk of spoilage. 
     The case of the invention is not limited in any way as to its mode of application, nor to its method of production and on the contrary, includes all variants obvious to those skilled in the art.