End closure with variable size pour opening

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SUMMARY OF THE INVENTION

The present invention relates to end closures for containers and more particularly to a easy opening end closure for a can or similar container.

Heretofore, packaging of highly viscous materials in easy opening containers has presented problems relating to the ability to pour the material from the can. If the material is poured while at a relatively elevated temperature, whereat its viscosity is somewhat lowered, a relatively small pour opening may be sufficient. However, if the user attempts to pour the material while at a relatively lower temperature, whereat its viscosity has increased, the small pour opening may be insufficient. However, if a larger pour opening is provided and the material is poured at an elevated temperature, the material may pour more rapidly than the user desires.

Further, it has proven cumbersome to manufacture and provide several different end closures to accommodate packaging of a variety of products.

It is therefore a primary object of the present invention to provide an easy opening end closure wherein the user may control the size of the pour opening.

It is a further object to provide an end closure as described above which may be produced with a minimum of modification to existing tooling and production equipment.

The above and other objects as may hereinafter appear may be more clearly understood with reference to the specification, drawings and appended claims.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a fragmentary top plain view of one embodiment of the end closure of the present invention.

FIG. 2 is a fragmentary cross-sectional view taken substantially along line 2--2 of FIG. 1.

FIG. 3 is a fragmentary top plain view similar to FIG. 1, showing the end closure in a partially opened condition.

FIG. 4 is a fragmentary top plane view of a second embodiment of the end closure of the present invention.

DESCRIPTION OF THE PREFERRED EMBODIMENT

As shown in the drawings, the end closure of the present invention comprises an end panel 1, opening member 2 non-removable attached thereto, and means included in the end panel 1 and co-operative with the opening member 2 to progressively vary the force required to open the closure.

The end panel 1 comprises a central web 3 and a perpheral channel portion 4. A score line 5 is formed in the central web 3 and defines therein an openable flap or member 6. The scoreline 5 is generally U-shaped, being symmetric about a longitudinal axis of the flap 6, and comprising a pair of legs 5a joined by a bight 5b.

The opening member 2, which may be of the type described in my co-pending application Non-Obstructing End Closure, Ser. No. 684,620 is attached to the end panel 1, by a rivet 8, in a manner well known in the art substantially overlying the openable member 6, with nose portion 2a of the member 2 lying in close proximity to the bight 5a of the score line 5.

A pair of inwardly directed rigidifying beads 7 may be formed in the flap 6 flanking the rivet 8 and extending radially inwardly from a line slightly forward of the rearward edge of the rivet shank 8a.

The force varying means comprises a plurality of end panel portions 1a.sub.1, and 1a.sub.2, each defined by a portion of the score line 5 offset, relative to the adjacent portions thereof, toward the longitudinal axis of the flap. The portions 1a are disposed in pairs spaced along the legs 5a of the score line 5, partially underlying the opening member 2, whereby they constitute an obstruction to displacement of the opening member 2, and thereby limit opening of the openable member 6 to a predetermined portion thereof. The portions 1a are themselves deflectable upon application of a predetermined force thereagainst, whereby the openable member 6 may be opened beyond the predetermined limit.

In operation, grasping portion 2b of the opening member 2 is lifted away from the end panel 1, causing the opening member 2 to rotate about the attaching rivet 8, and causing the nose portion 2a to rupture the bight portion 5a of the score line 5. Further displacement of the grasping portion 2b causes controlled tearing of the end panel 1 along the score line 5.

The extent of the opening thus created is first limited by the pair of portions 1a.sub.1, nearest the end panel periphery, which obstruct continued displacement of the opening member 2. At this point, a relatively small opening, suitable for pouring of liquids of low viscosity, has been established.

If a larger opening is desired, a predetermined force is applied to the portions 1a.sub.1, through the opening member 2, causing the portions 1a.sub.1, to be deflected to a non-obstructing position. The opening member 2 may thus be moved past the portions 1a.sub.1, whereupon continued tearing of the score line 5, and hence opening of the closure, may be achieved through application of a reduced force to the opening member 2, until the obstruction of portion 1a.sub.2 is encountered. During opening, the deads 7 overcome the natural tendency of the flap 6 to bend about a transverse line touching the rearward edge of the rivet shank 8a. By rigidifying the flap 6, the portion thereof radially inwardly of the natural bend line may be pushed into the container as described.

If a still larger opening is desired, this second obstacle also may be overcome in the manner above described.

It is thus seen that the portions 1a.sub.1 and 1a.sub.2 comprise "stops" whereat opening of the closure is self terminating, and whereat a directed effort is required to further enlarge the opening.

As shown in FIG. 4, a single pair of portions 1a, may be employed if a lesser number of opening options is desired.

It it is desired to fully open the closure after the last obstructing portions 1a.sub.2 have been overcome, the opening member 2 is pulled away from the end panel 1, until the entire scoreline 5 has been sheared and the flap 6 has been moved to an unobstructing position relative to the pour opening.

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