Carrier stock having finger-gripping straps and strut-producing straps

CA 02156374 1999-09-08

- 1 CARRIER STOCK HAVING FINGER-GRIPPING STRAPS AND STRUT-PRODUCING STRAPS

Cross-Reference to Related Application

This application is related in part to Canadian Patent Application Serial No. 2,155,613 which was filed August 8, 1995, which is owned commonly herewith, and the disclosure of which may be referred to for further details.

Technical Field of the Invention

This invention pertains to carrier stock for substantially identical cans, such as beverage cans, of a type having a chime and an inwardly tapered neck below the chime. The carrier stock is formed from a single sheet of resilient polymeric material, such as low density polyethylene, so as to have pairs of finger-gripping straps and strut-producing straps. The finger-gripping straps of each pair are curved inwardly toward each other.

Background of the Invention

Carrier stock as exemplified in Weaver et al. U.S. Patent No. 4,219,117 and Benno et al., U.S. Patent No. 3,959,949 is employed commonly for machine application, typically with machines described in Braun U.S. Patent No. 4,250,682 or other similar jaw and drum machines, to substantially identical cans, such as beverage cans utilized commonly to contain beer and soft drinks. Such cans have annular chimes at their upper ends, cylindrical side walls, and frusto-conical walls between the chimes and the side walls. Such stock is formed, as by die-cutting, from a single sheet of resilient polymeric material, such as low density polyethylene.

Typically, such stock has integrally joined band segments including outer band segments and inner band segments and defining can-receiving apertures in

- 2 longitudinal rows and transverse ranks, along with separating webs extending generally transversely when the carrier stock is in a flat, unstressed condition. The separating webs separate the can-receiving apertures in each longitudinal row. When such stock is applied effectively, the band segments defining the can-receiving apertures grip the frusto-conical walls of the cans tightly and engage the lower edges of the chimes.

Such stock also may have finger-gripping straps arranged in pairs. As known heretofore, the fingergripping straps have generally straight edges and extend generally transversely between two of the inner band segments when the carrier stock is in a flat, unstressed condition. It is intended for a user to grip one pair of the finger-gripping straps with the thumb and forefinger of one hand for lifting a package comprising a rectangular array of such cans and a carrier severed from such stock and applied to the cans in the rectangular array.

Such finger-gripping straps may also function to transfer laterally directed stretching forces from outer bands to inner bands, as suggested in Weaver et al. U.S. Patent No. 4,219,117.

Can manufacturers have introduced cans having smaller chime diameters, as compared to the diameters of the side walls, which cans are known as necked-in cans. Some newer versions of these necked-in cans further and drastically reduce the ratio of the chime diameter and the side wall diameter.

In a necked-in can of a newer type, the frustoconical wall between the chime and the side wall

- defines a conical angle greater than approximately 28°, and in some instances as great as approximately 37°. Moreover, some recently introduced, necked-in cans are taller and have a greater capacity, as compared to

- 3 prior cans of the type noted above.

A package comprising a carrier severed from carrier stock of the type noted above and such neckedin cans, particularly but not exclusively such taller cans of greater capacity,'has presented a problem that is -addressed by this invention. The ability to reduce thickness of carrier stock to obtain economies could also present a problem.

Specifically, there has been a tendency for the cans to move independently of each other in such a package, whereby it can become difficult to stack the package with like packages on a pallet.

Summary of the Invention

This invention addresses the aforenoted problem and provides improvements in carrier stock for machine application to substantially identical cans of the type noted above. This invention also provides an improved package comprising a carrier severed from the carrier stock, as improved by this invention, and such cans in a generally rectangular array comprising longitudinal rows and transverse ranks.

As formed from a single sheet of resilient polymeric material, such as low density polyethylene, the carrier stock is formed with outer band segments and inner band segments. The outer and inner band segments define can-receiving apertures in a generally rectangular array having longitudinal rows and transverse ranks. The carrier stock is formed with webs separating the can-receiving apertures in each longitudinal row. The carrier stock is formed with finger-gripping straps arranged in pairs.

In accordance with this invention, the carrier * stock has several novel features. Thus, on each side of a longitudinal midline of the carrier stock, the inner band segments are arranged in pairs with each pair including a pair of substantially linear, inner

-Pledges connected by relatively small radius at an apex. Also, the finger-gripping straps are configured such that each finger-gripping strap of each pair extends generally transversely between two of the inner band segments and is curved inwardly toward the other finger-gripping strap of the same pair when the carrier stock is in a flat, unstressed condition. Moreover, the carrier stock is formed with a reinforcing and strut-producing strap intermediate the finger-gripping straps and aligned with the apexes of opposed inner edges, the strut-producing strap being of relatively large width compared to the radius of each apex.

Preferably, each finger-gripping strap of each pair has an outer edge, which has an indentation curved inwardly toward the other finger-gripping strap of the same pair and extended transversely in opposite directions from the longitudinal midline when the carrier stock is in a flat, unstressed condition. Preferably, the strut-producing strap is at least twice as wide as any pair of the finger-gripping straps and at least twice as wide as the radius of each apex.

Preferably, each finger-gripping strap of each pair has an outer edge, which has an indentation curved inwardly toward the other finger-gripping strap of the same pair and extended transversely in opposite directions from the longitudinal midline when the carrier stock is in a flat, unstressed condition.

These and other objects, features, and advantages of this invention are evident from the following description of a preferred embodiment of this invention with reference to the accompanying drawings.

Brief Description of the Drawings

Figure 1 is a perspective view of a package comprising six substantially identical cans of the type noted above and a carrier severed from a carrier stock according to one contemplated embodiment of this invention.

Figure 2 is a top, plan view of the same package, substantially as shown in Figure 1.

Figure 3 is a sectional view taken along line 3—3 of Figure 2, in a direction indicated by arrows.

Figure 4 is a top, plan view of the carrier stock in a flat, unstressed condition.

Detailed Description of Preferred Embodiment

As shown in Figures 1 and 2, a package 10 comprises six substantially identical, necked-in cans 12 of the type noted above and a carrier 14, which is severed from a carrier stock according to a preferred embodiment of this invention. Each can 12 has an annular chime 16 of a given diameter, a cylindrical side wall 18 of a larger diameter, and a frusto-conical wall 20 between the annular chime 16 and the cylindrical side wall 18. The annular chime 16, the cylindrical side wall 18, and the-frusto-conical wall 20 define a can axis. The upper end of each can 12 has a pull tab 22. Generally, since each can 12 is of the newer type noted above, the frusto-conical wall 20 of such can 12 may define a conical angle greater than 28° relative to the can axis.

As shown in Figure 4, the carrier stock 30 is formed in an indeterminate length, as by die-cutting, from a single sheet of resilient polymeric material. A preferred material is low density polyethylene. A preferred thickness for such stock 30 in an unstressed condition, if low density polyethylene is used, is in a range from approximately 16 mils to approximately 17.5 mils. The carrier stock 30 is severable along transverse lines L to form individual carriers * exemplified by the carrier 14. The lines L maÿ be preslitted or prescored to facilitate severing the carrier stock 30.

The carrier stock 30 is formed, for each

- 6 individual carrier 14, with integrally joined band segments defining six can-deceiving apertures 32 in a rectangular array with two longitudinal rows and with three transverse ranks. The apertures 32 are elongated in the longitudinal direction of the carrier stock 30 to facilitate opening of the carrier stock 30 into a generally circular upon application ΰϊ transverse * application forces.

The band segments include outer segments 34 extending longitudinally, in two longitudinal rows, with each outer segment 34 partly bounding one of the can-receiving apertures 32. The band segments also include inner segments 38 extending longitudinally, in two longitudinal rows, with each inner segment 38 partly bounding one of the can-receiving apertures 32. On each side of a longitudinal midline of the carrier stock 30, each can-receiving aperture 32 is bounded partly by a pair of such inner segments 38 having substantially linear, inner edges 39 connected by a relatively small radius at a relatively small apex A.

The carrier stock 30 is formed with separating webs 40, which extend generally transversely when the carrier stock 30 is in a flat, unstressed condition, and which separate the can-receiving apertures in each longitudinal row. Each separating web 40 is joined integrally to the ends of two outer segments 34 and to the ends of two inner segments 38. Each line L extends across and divides two separating webs 40. In Figure 4, an exemplary one of the separating webs 40 is indicated generally by the larger, dashed circle.

The carrier stock 30 is formed with clusters of band segments or straps configured so as to extend

- generally transversely when the carrier stock is in a flat, unstressed condition, such straps including finger-gripping straps 50 arranged in pairs and reinforcing and strut-producing straps 52. Each

- 7 finger-gripping strap 50 has two curved legs 54 and a center section 51 between the legs 54. Each reinforcing and strut-producing strap 52 is interposed between the finger-gripping straps 50 of a respective pair. The carrier stock 30 is formed with additional apertures including a finger-admitting aperture 56 between each cluster and the next cluster and two smaller apertures 58 within each cluster.

Each finger-gripping strap 50 of each pair is curved inwardly toward the other finger-gripping strap of the same pair through the arcuate center section between the legs 54 (without engaging the reinforcing and strut-producing strap 52 interposed between the finger-gripping straps 50 of the same pair) when the carrier stock 30 is in a flat, unstressed condition. Each leg 54*of each finger-gripping strap 50 is connected not only with an associated one of the inner segments 38 but also with a separating web 40.

A connecting web 60 extends from such leg 54, generally along the associated one of the inner segments 38, and connects such leg with an associated one of the separating webs 40 and with an associated one of the inner segments 38. Each connecting web 60 defines an uninterrupted web. In Figure 4, an exemplary one of the connecting webs 60 is indicated generally by the smaller, dashed circle.

At its outer edge 55, the center section 51 of each finger-gripping strap 50 of each pair of such straps 50 has an indentation 57, which is curved inwardly toward the other strap 50 of the same pair and which is extended transversely in opposite directions from the longitudinal midline of the carrier stock 30 * when the carrier stock 30 is in a flat, unstressed condition. The indentations 57 facilitate gripping the center sections 51 of the finger-gripping straps 50 of a given pair between the thumb and another finger of

CA 02156374 1999-09-08 one hand of a user.

As shown in Figure 4, each reinforcing and strutproducing strap 52 has a wide hourglass configuration when the carrier stock 30 is in a flat, unstressed condition.

Preferably, such strap 52 is at least twice as wide as any pair of the finger-gripping straps 50 and at least twice as wide as the radius of each apex A, when the carrier stock 30 is in a flat, unstressed condition.

The carrier stock 30 is tensioned when applied to the cans 12, as with machines described in Braun U.S. Patent No. 4,250,682 or other similar jaw and drum machines. Thus, as shown in Figure 3, each reinforcing and strut-producing strap 52 is reconfigured so as to produce a strut or beam having a generally U-shaped cross-section. The struts or beams produced by the reconfigured straps 52 substantially reduce the ability that the cans 12 in the package 10 would have otherwise to move independently of each other. Thus, the struts or beams produced thereby substantially facilitate stacking of the package 10 with like packages on a pallet.

In other structural and functional respects, the carrier stock 30 is similar to the several embodiments of carrier stock that are disclosed in Canadian Patent Application Serial No. 2,155,613 supra, the disclosure of which again may be referred to for further details if desired.

Thus, the carrier stock 30 permits the can-receiving apertures 32 to be opened to generally circular configurations, generally in a manner disclosed in Weaver et al. U.S. Patent No. 4,219,117, the disclosure of which may also be referred to for further details.

Also, when a user grips one pair of the fingergripping straps 50 of such a carrier 14 with the thumb

- 9 and forefinger of one hand for lifting such a package 10, the connecting webs 60 at the legs 54 of the gripped straps 50 distribute some of the lifting forces to the separating webs 40 connected to the same 5 connecting webs 60 so as to reduce tendencies of the carrier 14 to peel off the cans 12 where the gripped straps 50 are connected to certain of the inner band segments 38. The straps 50 may not be curved in the finished package, since the outer edges of the straps 50 may be tensioned.

Various modifications may be made in the preferred embodiment described above without departing from the scope and spirit of this invention.