Abstract:
A closure arrangement for a hollow wall tray including a lid hinged to the rear wall and having depending therefrom a flange engagable with the inside of the front wall of the tray.

Description:
BACKGROUND OF THE INVENTION 
     1. Field Of The Invention 
     This invention relates generally to folding cartons and more particularly to a closure arrangement for a hollow wall tray having an integral cover. 
     2. Description Of The Prior Art 
     A state of the art search directed to the subject matter of this application uncovered the following U.S. Pat. Nos. 1,081,068; 1,211,223; 1,530,644; 1,787,498; 2,308,818; 2,321,145; 2,331,754; 2,373,977; 2,447,243; 2,581,400; 2,614,746; 2,668,654; 2,687,839; 2,714,483; 2,839,236; 2,866,587; 2,983,428; 3,095,137; 3,100,074; 3,404,829; 3,744,705, 3,924,801; 4,034,908; 4,040,559; 4,042,166. 
     None of the prior art patents uncovered in the search disclose a hollow wall tray having the unique locking arrangement with the cover flange that is disclosed and claimed in the present invention. 
     SUMMARY OF THE INVENTION 
     It is an object of the invention to provide a hollow wall tray and integral cover formed from an unitary blank of foldable paperboard which has a positive locking arrangement between the tray front wall and the cover. 
     A more specific object of the invention is the provision of locking tabs extending from the upper portion of the tray front wall for receipt within apertures of a flange formed integrally with and depending from the cover top wall. 
     These and other objects of the invention will be apparent from an examination of the following description and drawings. 
    
    
     THE DRAWINGS 
     FIG. 1 is a perspective view of an integral tray and cover embodying features of the invention and shown in the open position; 
     FIG. 2 is a perspective view of the structure illustrated in FIG. 1, but with the cover shown in the closed position; 
     FIG. 3 is a fragmentary vertical section taken on line 3--3 of FIG. 2; 
     FIG. 4 is a plan view of a blank of foldable sheet material from the carton illustrated in the other views may be formed; and 
     FIG. 5 is a plan view of the blank illustrated in FIG. 4, but after certain elements have been folded in position to begin forming carton structure. 
     It will be understood that, for purposes of clarity, certain elements may have been intentionally omitted from certain views where they are believed to be illustrated to better advantage in other views. 
    
    
     DESCRIPTION OF THE INVENTION 
     Referring now to the drawings for a better understanding of the invention, it will be seen that the carton indicated generally at C and illustrated in FIGS. 1 through 3 includes integral tray and lid members T and L, respectively, and may be formed from the unitary blank B of foldable sheet material, such as paperboard, illustrated in FIGS. 4 and 5. 
     Tray member T includes a bottom wall 10 having opposed front and rear side walls 12 and 14 and end walls 16 upstanding therefrom and foldably connected thereto and to each other to form a box-like structure open at the top. The side and end walls are interconnected by means of gusset members 18 in a manner hereinafter described. 
     Cover or lid member L includes a top wall 20 having an integral flange 22 secured thereto and depending therefrom at a location spaced inwardly from the front edge thereof. 
     As best seen in FIG. 3 bottom wall 10 of tray member T includes a pair of inner and outer panels 10a and 10b which are secured to each other in face-to-face relation with their forward edges being foldably joined along fold lines 11a and 11b to the lower edges of front wall inner and outer panels 12a and 12b, respectively. 
     The upper edges of front wall inner and outer panels 12a and 12b are joined to each other by a relatively narrow elongated upper or connecting panel 12c which is foldably joined at its inner and outer edges along fold lines 11c and 11d to the upper edges of inner and outer panels 12a and 12b, respectively. It will be noted that the forward edge of connecting panel 12c is provided with at least one if not more projections or locking tabs 12d the purpose of which is described later in the specification. Rear side wall 14 is also a hollow wall and comprises an inner panel 14a which is foldably joined at its lower edge along a fold line 13a to the rear edge of bottom wall inner panel 10a; an upper or connecting panel 14c which is foldably joined at its inner edge along fold line 13b to the upper edge of inner panel 14a; an intermediate panel 14d which is foldably joined at its upper edge along fold line 13c to the outer edge of upper panel 14c; and an outer panel 14b which is foldably joined at its lower edge along a fold line 13d to the rear edge of bottom wall outer panel 10b. 
     Each of the end walls 16 are also hollow walls and each comprises an outer panel 16a foldably joined at its lower edge along fold lines 17a to an end edge of bottom wall outer panel 10b; an upper or connecting panel 16b foldably joined at its outer edge along fold lines 17b to the upper edge of outer panel 16a; an inner panel 16c foldably joined at its upper edge along fold lines 17c to the inner edge of upper panel 16b; and a lower or retaining panel 16d foldably joined at its inner edge along fold lines 17d to the lower edge of inner panel 16c. Retaining panel 17d may be adhesively secured to the inner face of bottom wall inner panel 10a inwardly of inner panel 16c or it may be folded outwardly so as to lie between inner and outer panels of the end wall in face-to-face relation with the upper surface of bottom wall inner panel 10a. As mentioned earlier each of the end walls 16 is connected to both of the front and rear side walls 12 and 14 by gusset elements 18 each of which includes a pair of generally triangular gusset sections 18a and 18b which are foldably joined to each other along a diagonal fold 19 and which are foldably joined to the adjacent end edges of the side wall outer panels on fold lines 19a and which are foldably joined to the adjacent side edges of related end wall outer panels along fold lines 19b. 
     As best seen in FIG. 1 and also in FIG. 5 the front and rear wall upper panels 12c and 14c may be provided with projections 12p and 14p, respectively, disposed to extend under the end wall upper panels 16b. 
     Also it will be noted that in the formation of the tray portion of the carton the sections of each of the gussets 18 are folded against each other in face-to-face relation and against the related side wall of the tray so as to be interposed between the inner and outer panels of the front and rear side walls of the tray. In the case of the rear side wall of the tray intermediate panel 14d may be adhesively secured to the inner surface of rear wall outer panel 14b. 
     Now to describe the cover or lid portion L of the carton. The cover portion includes an outer panel 20a and inner panel 20b which are joined to each other at their outer edges along fold line 21 and folded and secured together in face-to-face relation. It will be noted that inner panel 20b has two sections that are separated from each other by the previously referred to locking flange 22. Flange 22 includes a pair of outer and inner flange sections 22a and 22b which are foldably joined to each other at their lower edges on fold line 23 and which are foldably joined along their upper edges on fold lines 23a and 23b to the adjacent edges of the top wall inner panel 20b. 
     It will also be noted that the flange panels are provided with apertures 25 which are disposed in alignment with the lock tabs 12a on the tray front wall upper panel so that when the lid is in closed position, as illustrated in FIG. 3, the lock tabs will be received within the apertures to form a positive locking connection between the tray and cover members.