A COMPOSITE CARTON

Abstract: A composite carton (10) is provided having a tray section (11) and a cover section (20) of dissimilar material connected thereto for relative movement about a predetermined foldline (21) between open and closed positions. The tray section has a marginal portion (14a) provided with a plurality of longitudinally spaced apertures (15). The cover section (20) is formed of a substantially transparent plastic and is provided with a marginal ledge having a first portion (27a) defining the predetermined foldline and a second portion (27b) offset from the foldline and provided with a plurality of stud-like protuberances (28). The protuberances are fixedly inserted in the corresponding apertures. The contents of the tray section are readily observable when the cover section is in a closed position.

Description: This invention relates to a a composite carton comprising a tray section and a cover section hingedly connected to one side of said tray section and movable relative thereto about a predetermined foldline between open and closed positions, one of the sections being provided with a laterally extending marginal portion surrounding an open top thereof, said marginal portion having a plurality of longitudinally spaced pocket means formed therein and offset in one direction from the foldline, the other section being provided with a peripheral flange delimiting an open bottom thereof and comprising a marginal ledge having a first portion defining the predetermined foldline and a second portion offset from said foldline and being provided with a plurality of longitudinally spaced protruding means fixedly disposed within said pocket means. A receptacle of this general type, namely a dispenser for moist towelettes including a container being provided with a lid closure is known from US-A-4,428,497. According to this document the lid includes a stationary rear portion which overlies a rear flange section of the container and is connected thereto by means of protuberances projecting into openings of the container flange section. Further, from US-A-3,568,914 there is known an egg carton having a pocketed molded paper pulp lower carton body portion and a transparent plastic or synthetic resinous material cover portion. According to the cited document the lower body portion and the cover portion are hingedly connected by the provision of an elongate terminal rib integrally molded on the extremity of one side of the lower body portion and a plurality of channeled projections integrally molded on one side of the cover portion and partially encompassing the elongate rib for pivotal movement thereon. Generally, because of the inordinate amount of egg breakage which occurs in the merchandizing of eggs in the supermarkets and self-service stores, it has become a serious problem for both the customer and retailer. The problem has been aggravated by the fact that it has become a customary practice or habit of the potential customer to open the loaded carton to inspect the contents before making the purchase. Where egg damage is found, the customer returns the carton to the display area, normally without closing the carton, and then proceeds to pick up another loaded carton for inspection. The procedure is repeated until the customer finds a carton with undamaged eggs. Such a procedure is an awkward, time-consuming and frustrating manipulation, oftentimes discouraging the customer from making the purchase. As far as the retailer is concerned, the afore-described practice of the customer creates an unsightly, disarranged display of the loaded cartons, and where the customer returns the unwanted carton to the display area without reclosing the carton, the next customer, when handling the returned carton, might cause the eggs to accidently fall out of the carton unless extreme care is exercised in handling same. The foregoing problems adversely affect the retailer's reputation for convenience and high quality merchandise, causes an inordinate amount of time and expense in returning the damaged eggs to the wholesaler for repacking and replacement, and increases overall the costs of doing business for both the wholesaler and retailer. It is an object of the invention to provide a composite carton which is of simple and inexpensive construction, provides good protection for the accommodated product or products, and enables the customer to readily observe the contents of the carton while the cover section remains in a closed position. This object according to the invention is accomplished by means of a carton of the type indicated at the outset and being characterized in that a segment of the first portion of the marginal ledge of the other section is disposed on the opposite side of the foldline with respect to the second portion when said other section assumes a fully open position with respect to said one section, that the segment of the first portion of the marginal ledge of the other section and the marginal portion of said one section assume a substantially superimposed relation when the other section is in a closed position with respect to said one section and that said sections consist of dissimilar materials. It is an advantage of the invention to provide a composite carton where the cover section thereof may be readily closed by conventional, high-speed, automatic closing machines normally utilized in commercial, egg packing plants. It is a still further advantage of the invention to provide a composite carton which has an aestetic appearance, and may be readily opened or closed by a simple manual manipulation. It is a still further advantage of the invention to provide a composite carton having the cover and tray sections thereof of dissimilar materials and yet the sections are permanently hinged together. For a more complete understanding of the invention, reference is made to the drawing wherein: Fig. 1 is a perspective view of the improved composite carton with the cover section thereof in an open position to permit loading and unloading of the tray section. Fig. 2 is an enlarged top plan view of the carton with the cover section thereof in a closed position. Fig. 3 is an end view of the carton or Fig. 2. Fig. 4 is an enlarged fragmentary sectional view taken along line 4-4 of Fig. 2. Fig. 5 is an enlarged fragmentary bottom plan view of the cover section per se . Fig. 6 is an enlarged fragmentary sectional view taken along line 6-6 of Fig. 5. Fig. 7 is an enlarged fragmentary bottom view of the carton of Fig. 2. Fig. 8 is an enlarged fragmentary sectional view taken along line 8-8 of Fig. 7. Referring now to the drawing and more particularly to Fig. 1, an improved composite carton 10 is shown which in the illustrated embodiment is particularly suitable for accommodating a dozen eggs. While the invention will be described hereinafter in relation to an egg carton it is not intended to be limited thereto. Carton 10 includes a tray section 11 which is preferably formed of molded pulp or molded foam plastic material. The tray section is provided with a plurality of egg-accommodating cells 12 arranged in two parallel rows of six cells each. The shape and size of the cells may vary from that shown and form no part of the invention herein described. The rows of cells are separated by a row of upstanding posts 13 which, as illustrated, projects above a plane A-A defined by a laterally extending flange 14 surrounding the open top of the tray section, see Fig. 3. A marginal portion 14a of the flange, defining the elongated rear side of the tray section, is provided with a plurality of longitudinally spaced apertures 15. The apertures 15 are aligned in a row which is substantially parallel to the row alignment of the cells 12. Each aperture is aligned with a transverse plane which extends between adjacent cells in a row. The number of apertures formed in marginal portion 14a may vary from that shown without departing from the scope of the invention. As seen in Fig. 8, each aperture 15 is preferably located in the upper surface of a hollow pedestal-like projection 16 formed in the marginal portion and recessed a short distance from the outer edge 14b of the flange. The pedestal-like projection 16 provides added stiffness to the marginal portion in the vicinity of the aperture. A second marginal portion 14c of the flange 14 defines the elongated front side of the tray section 11. The marginal portion 14c is provided with a plurality of indentations 17 which constitute a complemental locking means to be described more fully hereinafter. The indentations 17 are aligned with hollow ribs 18 which separate adjacent cells in a row and interconnect the front and rear sides of the tray section to the upright posts 13. Connected to the marginal portion 14a of the tray section is a cover section 20. The cover section is adapted to be moved about a predetermined foldline 21 between open and closed positions (Figs. 1 and 3, respectively) relative to the open top of tray section 11. The cover section is separately fabricated and is preferably formed of a substantially transparent heat-formable plastic. The cover section includes a central portion 22, depending front and rear walls 23,24 and depending end walls 25. The depending walls terminate in a peripheral flange 26 which delimits an open bottom. When the cover section is closed, the flange 26 rests upon the flange 14 of the tray section 11. The portion of the cover section flange adjacent the rear wall 24 forms a ledge 27, see Fig. 5. The ledge includes a first portion 27a having a segment thereof which defines the foldline 21, and a second portion 27b which, as shown in Fig. 5, is offset outwardly from the foldline 21. The second portion 27b includes a plurality of longitudinally spaced tabs T. The number of tabs correspond to the number of apertures 15 formed in the marginal portion 14a of the tray section 11. As seen in Figs 5 and 6 each tab T is provided with a stud-like protuberance 28. The protuberances are sized to snugly fit within the corresponding apertures 15. In one method of attaching the cover section 20 to the tray section 11, the tabs T are supported so that the protuberances 28 project upwardly and the marginal portion 14a of the tray section 11 is positioned over the ledge 27 and then pushed down onto the ledge whereby the protuberances thereof will be inserted into the corresponding apertures 15. In the illustrated embodiment, the tops of the protuberances 28 extend slightly above the apertures whereupon the protruding tops are compressed by a heated roller or the like, not shown, causing the tops to be enlarged and thus, become impassable relative to the apertures. By reason of the tops of the protuberances 28 being enlarged the tabs T are in effect riveted to the rear marginal portion 14a of the tray section. If desired, the protuberances 28 and the remainder of the tabs can be secured to the marginal portion 14a by a suitable adhesive material. As seen in Fig. 8, the configurations of the underside of the apertured marginal portion 14a and of the upper side of the tabs T are such that each tab T nests under the apertured marginal portion 14a of the tray section 11. In lieu of the apertures, closed sockets, not shown, may be formed in marginal portion 14a and the protuberances 28 compressed therein and retained in place by suitable adhesive. The front side of the cover section 20 is provided with a plurality of depending resilient locking fingers 30. The lower edges 30a of the fingers are folded back a small amount so as to form a hook-like member, see Fig. 4. When the cover section assumes a closed position, the lower edges 30a of the fingers 30 will automatically interlock with the undersides of the indentations 17. Because the plastic utilized in forming cover section 20 is relatively flexible, the fingers 30 may be manually pulled outwardly a sufficient amount so as to clear the corresponding indentations thereby allowing the cover section to manually hinged to an open position. When the cover section is moved to a closed position, the lower edges 30a of the fingers 30 will engage the upper corners of the indentation 17 causing the finger edges to be cammed outwardly and slide past the indentations. When the edges have cleared the bottom edges of the indentations, the edges will snap into interlocking relation therewith. To provide the desired flexibility to the fingers 30, a segment of the front flange 23 of the cover section, immediately behind each finger 30, may be removed leaving a void V, see Fig. 1. Other types of locks well known in the art may be utilized to retain the cover section 20 in a closed position. In the illustrated embodiment, the center portion 22 of the cover section 20 is provided with a plurality of depending posts 31 which abut the tops of the tray section posts 13, see Fig. 3, thereby providing reinforcement for the cover section 20 when the latter assumes a closed position. It will be noted in Fig. 2 that, when the cover section is in the closed position, a second segment of the first portion 27a of the ledge, disposed to one side of the foldline 21, will substantially overlie the marginal portion 14a of the tray section flange 14 and the enlarged tops of the stud-like protuberances 28. Thus, the enlarged tops of the protuberances 28 are shielded by the second segment of portion 27a of the ledge 27. As aforementioned, the size and shape of the cover and tray sections may vary from that shown without departing from the scope of the invention. Furthermore the number and shape of the tabs T may also be varied. While the invention has been described in relation to an egg carton it is not intended to be limited thereto but may be utilized in any type of composite carton wherein it is desirable to be able to observe the contents thereof without opening the carton. Furthermore, the improved composite carton has the cover section thereof hingedly attached in a permanent manner to the tray section thereof, notwithstanding that the sections are of dissimilar materials and are separately fabricated. By reason of the permanent hinged connection between the cover and tray sections, the composite carton may be readily closed by conventional high speed automatic closing equipment normally found in commercial packing plants.

Claims: A composite carton (10) comprising a tray section (11) and a cover section (20) hingedly connected to one side of said tray section and movable relative thereto about a predetermined foldline (21) between open and closed positions, one of the sections (11) being provided with a laterally extending marginal portion (14a) surrounding an open top thereof, said marginal portion having a plurality of longitudinally spaced pocket means (16) formed therein and offset in one direction from the foldline, the other section (20) being provided with a peripheral flange delimiting an open bottom thereof and comprising a marginal ledge (27) having a first portion (27a) defining the predetermined foldline (21) and a second portion (27b) offset from said foldline (21) and being provided with a plurality of longitudinally spaced protruding means (28) fixedly disposed within said pocket means (16), said carton (10) being characterized in that a segment of the first portion (27a) of the marginal ledge (27) of the other section is disposed on the opposite side of the foldline (21) with respect to the second portion (27b) when said other section (20) assumes a fully open position with respect to said one section (11), that the segment of the first portion (27a) of the marginal ledge (27) of the other section (20) and the marginal portion of said one section (11) assume a substantially superimposed relation when the other section (20) is in a closed position with respect to said one section (11) and that said sections (11, 20) consist of dissimilar materials. The composite carton of claim 1 wherein the pocket means (16) includes a plurality of apertures (15), and the protruding means includes a plurality of stud-like protuberances (28) fixedly inserted in corresponding apertures (15). The composite carton of claim 2 wherein the second portion (27b) of the marginal ledge (27) includes a plurality of tabs (T), each tab (T) being provided with a stud-like protuberance (28). The composite carton of claim 1 wherein the material of one (20) of the sections (11,20) is formed of a substantially transparent heat-formable plastic. The composite carton of claim 4 wherein the other section (11) is a molded tray section (11). The composite carton of claim 5 wherein the molded tray section (11) is provided with at least one cell (12) for accommodating a product; the accommodated product being observable when the cover section (20) is in a closed position. The composite carton of claim 1 wherein the tray and cover sections (11, 20) are provided with releasable complemental locking means (17, 30), said locking means (17, 30) being spaced from the predetermined foldline (21). The composite carton of claim 7 wherein the complemental locking means (17, 30) automatically interlock with one another when the cover section (20) assumes a closed position. The composite carton of claim 1 wherein the tray section (11) is of molded pulp material and is provided with at least one row of cells (12) for accommodating fragile articles, and the cover section (20) is formed of a substantially transparent heat formable plastic whereby the cell-accommodated fragile articles are observable when the cover section (20) is in a closed position. The composite carton of claim 9 wherein the tray section (11) is provided with at least one upstanding post (13), said post (13) supportingly engaging said cover section (20) when the latter assumes a closed position. The composite carton of claim 10 wherein the cover section (20) is provided with at least one depending post (31), which abuttingly engages a corresponding upstanding post (13) formed in the tray section (11) when the cover section (20) assumes a closed position. The composite carton of claim 1 wherein the tray section (11) comprises a molded tray section (11) provided with a plurality of egg-accommodating cells (12) arranged in adjoining parallel rows; and wherein the cover section (20) is formed of a substantially transparent heat-formable plastic, so that cell-accommodated eggs are observable through the cover section (20) when the latter is in a closed position, and wherein the predetermined foldline (21) is substantially parallel to a row of egg-accommodating cells (12).

Inventors: BIXLER, KENNETH D., ERXLEBEN, FRED R., KEENE, DANIEL E.
Applicants: PACKAGING CORPORATION OF AMERICA
Application year: 1987
Main classification: B65D85
IPC codes: B65D85