Pushdown openings with purchase, leverage and gas-tight resealability for can ends
An easy-to-open and optionally resealable beverage can end provides opening by pressing downward. An actuator lies flat initially to conform to stackability requirements, but is readily repositionable to a ready-to-open state. In the ready-to-open state a planer surface of the actuator or tab is at a substantial angle to the can's top. A rigid body is interposed between it and the can's tear panel. The actuator is secured to the can top. Downward force ruptures the tear panel, opening the can. Using a wide actuator, a shallow protrusion on the actuator enables gas-tight resealability of a can opening. The shallow protrusion has an interrupted helix and fits into the can opening. Providing tab attachment via a radiused slot allows the small degree of rotational movement needed for the helix to be turned and pull the actuator bottom sealingly abutted proximate to the perimeter of the opened area.
This application claims U.S. provisional application 61/188,494 filed on Aug. 11, 2008 and PCT/US 09/01503 filed on Mar. 4, 2009 for priority. Both of the above previous applications and U.S. provisional application 61/067,906 filed on Mar. 3, 2008 are hereby incorporated by reference in their entireties.
FIELDThe field of this invention is closures for receptacles particularly those closures with a frangible portion that breaks along a point or line of weakness.
BACKGROUNDA common category of closures, particularly for aluminum cans containing carbonated drinks, is the so-called pop-top or stay-on-tab. Typically the attached tab initially lies flat against the top surface of the can end and is lifted by its extremity closest to the rim. With one point held to the can by a rivet, the tab acts as a lever for applying force against a tear panel. A lifting action causes a line of weakness surrounding the tear panel to be severed or ruptured. Both the tab and the tear panel are retained to the can end, called an “end” or “end wall”. There are many known variations of similar and related closures.
One area of perceived deficiency in existing designs may be in the ease of opening. Opening can be difficult in some cases because of a lack of “purchase” particularly at the initial stage of movement of the tab. Unfortunately this is the point at which the initial rupture of the line of weakness occurs thereby requiring the greatest effort. It can be particularly difficult and painful for persons with long fingernails. Long nails tend to magnify the load on the fingernail bed. Using your fingernails to open current pop-top cans may also damage or break polished or decorated fingernails. Opening could also be difficult for those lacking strength or dexterity.
Many solutions to this problem have been proposed. Some include variants of a lifted lever design. A feature of some of these designs is that the full resistive force of the tear panel is only encountered after the lever is raised somewhat to a position providing a slightly improved purchase. Other solutions include using purpose-designed tools to open a standard end. Also, there are designs that involve the user pushing down on a structure that is at a small angle to the plane of the can end. These later versions may present problems due to providing little leverage and having a very short throw.
Another generally present drawback is the inability to reseal a can after its initial opening. Some approaches that might be adequate to reduce spillage or keep out insects do not seal well enough to keep a carbonated drink from quickly going flat. Proposed designs generally fall into two classes: (1) a stopper attached or integral to the tab that has a complementary shape to the dispensing opening and is repositioned over the opening and simply pressed into it; (2) a plate or other body inside the can that can be repositioned from the outside to block the opening from underneath.
The latter approach tends to be complicated and would likely interfere with the stackability of the ends. The former relies on a friction fit, possibly augmented by a plastic coating or even a retaining latch. Those schemes would tend to either (a) not be gas-tight, (b) be pushed open by the force of the carbonation, or (c) be so close a fit as to be difficult to close and re-open.
While the deficiencies mentioned above have given rise to many attempts at a solution, meeting the constraints for a cost-effective and practical implementation is difficult. In order to be compatible with existing can fill and assembly equipment, any structure above or below the primary plane of the can end must be extremely low profile to allow stacking of ends. At many steps in a production process ends are stacked directly upon each other, rim-to-rim. The protective coating on the bottom of a can end should not get touched by any aspect of the top of the can end below it in such a stack. This is to avoid the risk of coating damage that would cause an end to be defective
Other constraints involve the cost of manufacturing. Although it may seem that only a small amount of material is used, the extremely high volume nature of beverage cans places a premium on each fraction of a gram of metal required and each fold or other discrete step in the manufacturing process. A practical solution should avoid an excess of material, mechanism, and complexity in order to be cost-effective to manufacture. Last, users are very familiar with the current style of can openings and are likely to assume that something outwardly resembling it, in fact, works like the current design. It would be desirable for a proposed new design to address this issue.
SUMMARYBeverage can ends employing the principles of this invention solve the problem of easy opening while accommodating the constraints of low profile for stackability and of low complexity. They employ an attached actuator configured to open the can by a short sequence of motions. An initial movement presents minimal resistance by not applying an opening force to the frangible area. The initial movements translate the actuator from a flat or stowed position to an elevated position of significantly improved purchase. That ready-to-open position also has adequate leverage to allow a modest applied force to easily rupture the frangible region. The force is transmitted via a rigid member or assembly situated between the actuator and the so-called tear panel, the frangibly openable region of the can end.
Implementations following the principles of this invention allow the advantageous modality of pushing downward to impart the opening force. A user could apply a downward force with the pad of the thumb, heel of the palm, or any such means as may be desired. Pushing down is a more convenient manner of applying force in this case since the user has unobstructed access to the surface to which the force must be applied. They can also “get their weight behind it” if necessary. Some can ends consistent with the principles taught herein offer convenient, gas-tight resealability with the inclusion of little additional mechanism or material.
Several approaches consistent with the principles taught herein are available for can end and actuator implementations that are initially substantially flat yet readily transform into a significantly upright position. The geometry of these upright positions provide an effective amount of leverage and adequate travel distance to rupture and then displace a tear panel into the can.
Some examples of implementations consistent with this invention include a rigid foot stowed in a depression in the can end. Others include various self-erecting rigid foot structures.
Can ends employing the resealability teachings of this invention have a generally squat cylindrical shaped structure called the “seal lock” that can be inserted into an opening. The seal lock can include an interrupted thread on its inserted portion for urging the actuator to sealing abutment with the surface surrounding the opening. The seal lock may be a portion of an actuator. Alternatively, urging the sealing surfaces together may be via inclined plane features of the top panel interacting with relatively flat under hang aspects of the insertable portion of the seal lock.
One way of sealingly engaging the seal lock is to provide for an amount of rotational degree of freedom about the center of the seal lock to allow turning an interrupted thread and locking the seal. Suitable rotational geometry can be implemented by a structure as low cost as a pin in an arcuate slot.
This summary is intended to introduce the inventive concepts, principles and embodiments, not to define them.
In conjunction with the included drawings this detailed description is intended to impart an understanding of the teachings herein and not to define their metes and bounds. Six particular implementations, each illustrating aspects of the present teaching, are presented below. Some of the many possible variations and versions are also described.
The first, second, and third examples are “rotating” versions in that a ready-to-open state is obtained via a rotational motion from the initial state. Some implementations in this category are “two-way” in that they have two modes of opening. In those designs one mode of opening involves rotating an actuator while the other involves lifting an actuator. The forth, fifth, and sixth examples detailed are “flop-over” versions. The flop-over designs provide a mode of opening in which the users' initial action is the familiar tab lifting. However the action that meets resistance and opens the can results from a downward force imparted to the tab later in the opening cycle.
As used in this document the terms up, upward, down, and downward are in reference to a can or can end with its bottom standing perpendicularly to the ground and its openable end facing away from the ground. Distal and central are with regard to the center of the can end's major plane and clockwise and counterclockwise are from an observer looking down on the upper surface of a can end. Also, the term translate is not limited to purely linear changes of position.
Rotating VersionsThe three initial implementation examples to be described are capable of opening in two distinct ways. They each have an actuator that pivots around a centrally located point of the can end. This pivoting or rotating is initially in a plane parallel to that of the top panel. That rotating results in the actuator being disposed in a raised, push-to-open position. The first implementation to be described outwardly resembles the current standard design. The second implementation has a self-erecting structure and the third implementation has features providing resealability.
First Presented Version—Two-Way Opening Resembling Current UnitsThis first version resembles current designs at first look but adds a new mode of opening.
Two-Way Opening Example StructureOne version of a can consistent with the teachings herein and which has a rotating actuator lever is seen in
As seen in
In the base beneath the actuator's initial position is a ramp pocket 12. This ramp area is a region of the top panel directly opposite the tear panel. The ramp pocket is seen in the exploded views of
As shown in the aforementioned figures, a foot 17 is integral to the actuator and depends from it. The foot's height is fully accommodated by the deepest part of the ramp pocket 12. This allows the actuator to lie flat against the top panel in its initial position with its foot resting in the ramp pocket. In the implementation pictured in
Cross sectional views along the line A-A of
The two methods of opening the present example can end are the familiar lift-to-open method and a push-to-open method.
Lift-to-Open Way—OperationThe lift-to-open method of opening this can end is essentially that of popular existing designs. Its inclusion provides many benefits. A novel design that looks similar to a traditional unit can avoid user frustration by allowing optional operation as a traditional unit. This mode might be said to make this version backward compatible.
To initiate the push-to-open, no-lift mode of operation of the present version, the finger grip 8 extremity is first pivoted about the rivet 11. The direction can be either clockwise or counterclockwise. This motion presents very little resistance.
As the actuator is further turned through the 90- and 135-degree positions shown in
As mentioned above, when at 180-degrees from its initial position the actuator foot 17 rests on the multiplier bump 14 of the tear panel as seen in
In this mode, opening the longer segment 34 of the actuator is configured as a class 2 lever. The fulcrum is the rivet 11 securing one end of the segment. The portion of the actuator from the rivet to the foot's 17 effective attachment point acts as the resistance arm and the portion from the foot's effective attachment point to the location of user-applied force is the effort arm. While this arrangement does not necessarily afford more leverage than the standard lift method it maintains a comparable mechanical advantage.
The geometry of this mode of opening primarily affords a significantly improved purchase. By improved purchase it is meant an enhancement in the ability and ease for a person to apply a force. In the push-down-to-open way of opening, the direction normal to the surface to which the user must deliver force is unobstructed and is free to be approached in a straightforward manner. The force may be delivered with a body part or an implement not unduly limited by size or dimension. At the typical physical relationship between a user and a can that user desires to open, pressing down is much easier than lifting upward. This results in a convenient and easy to open can end.
The just-opened state is seen in
Variations
There are many possible variations of the version described above. One is to eliminate the backward compatibly. Another variation would be to make the design asymmetric allowing only one direction of initial rotation. An asymmetric version might include only one half of the ramp pocket 12. This could be combined with an asymmetric actuator tab having an upturned rest or finger hold on one edge. That design could suggest the required rotational direction and method of opening to a user.
Second Presented Version—Self-Erecting on RotationAn implementation seen in
Self-Erecting on Rotation—Structure
In
As seen in
Self-Erecting on Rotation—Operation
This changing of shape of the foot assembly 51 raises the actuator from the plane of the top panel, as seen in
Constraints are put on the material and structure of the foot assembly in order for it to bend into position as a foot. The actuator is rotated with only a low to moderate force so at least the hinge points need to be soft. Of course, the most cost effective construction of the foot assembly is likely as an integral piece. It must bend into position relatively easily but have sufficient strength to effectively carry out its role as a foot when in the ready-to-open configuration. Particular plastics, aluminum, steel, and alloys of these and other metals are well known to those skilled in the art as possible materials. Alternatively, the various sub-parts of the foot assembly might be individual components connected by distinct hinges. In that case, the material and construction of the sub-components and that of the hinges need not be the same.
Various complete can end designs that are consistent with this version may provide for an effective dispensing or drinking position in various manners. The actuator might be broken off, it might be pushed into the can opening, or it might be snapped into the opening in such a configuration as to not block a desired fluid flow. Those implementations would have a thin actuator perimeter with a shape and features complementary to those of the opening and a relatively large open central region allowing for the effective flow of liquid.
In some designs it might be desirable to be able to counter-rotate the actuator back to its initial position while unfolding the foot assembly. A design of that nature would put additional constraints on the material and structure of the foot assembly. They would be such as to provide for the various hinge points connected with some more constrained hinge structures, at least to the extent of providing for one folding followed by one unfolding.
Third Presented Version—Resealable, Two-Way OpeningThe third specific implementation example is also a two-way opening design. One way to open is a rotate and then push-to-open mode. The other way is a so-called “backward compatible”, lift-to-open mode. In addition, this example embodiment has the feature of resealability in a secure and gas-tight manner.
Resealable, Two-Way Opening—StructureThis example can end, shown in
A rivet accommodating hole 119 goes through the base proximate to its center. An actuator 104 is secured to the top panel 106 by a rivet 111 or pin through an arcuate slot 132 in the actuator and the base's hole's. The radiused slot is reinforced by a surrounding oval donut 113 deformation. A relatively small arcuate nose 109 is at the extremity of the actuator closest to the radiused slot. The distal extremity 108 of the teardrop terminates proximate to the rim 105 and has an arcuate edge of approximately the same radius as the rim's. It may be desirable to modify the design shown in the drawings to allow a larger finger-hold at that extremity. The slot 132 in the actuator 104 is generally transverse to the major axis of the actuator. The slot is somewhat skewed from that transverse axis and is about 85-degrees to the major axis. The plan view of the actuator in
Seen in the exploded view of
A generally planer bottom face 136 region of the actuator seen in
The base 103 in isolation is shown in a perspective view in
Similar to the previously described rotating actuator version, this version has two modes of opening. The operations are discussed below.
To initiate the push-to-open, low effort mode of operation of this version, the actuator 104 is pivoted about the rivet 111 in a clockwise direction. As seen in
When 180-degrees from its initial position, the foot of the actuator rests on the raised oval boost 114 of the tear panel 107 as seen in
To conveniently drink from the can, the actuator 104 is moved back to its initial position by reversing the direction rotation as seen in
Reseal—Operation
This implementation has the feature of resealability. The seal lock 133 depending from the bottom surface 136 of the actuator 104 is of a size that is slightly smaller than the tear panel 107.
To reseal, the actuator is rotated in a clockwise direction 138, as it was originally turned to open the can. Since the foot 117 no longer has the tear panel to ride across, the foot falls into the opening. In the specific version shown in
The last action the user takes to complete resealing and to lock in place is to turn the actuator 104 counterclockwise as diagramed in
Variations—Two-Way with Reseal
There are many possible variations of the implementation described above consistent with the teaching of the present disclosure. There could be more than two wings. An elastomeric material or coating between the bottom surface 136 of the actuator 104 and the top panel's 106 surface just outside tear panel 107 may be employed to achieve an improved seal. That optional elastomeric material might be coated on the bottom surface of the actuator or might be an aspect of the upper surface of the top panel, for example. The shape of the opening and seal lock 133 could differ from that presented. A circular opening could allow for a taper-to-taper mating between a raised area of an actuator's bottom surface and raised area surrounding a tear panel.
Alternatively, rather than being fixed to a tab or actuator, a seal lock similar to that described above might be rotatably mounted to a tab rather than employing an arcuate slot to provide the second degree of freedom of movement. Rather than rotating an interrupted thread, the inserted portion of a seal lock might be expanded and raised upward by a lever or other means on the outside of the can.
Variation—Alternate Site of “Interrupted Thread”
There are other versions with alternate structures used to urge the sealing abutment of the bottom face of an actuator with the surrounding area. One alternative is to have a seal lock 173 with two or more flat topped underhang protrusions in place of the angled wings. To have the same screw action as the previously described system, the opposing surface to the flat underhang portions must have an “interrupted inclined plane” feature. In this version, the area of the top panel surrounding the opening is configured, possibly by stamping, to have three or more inclined plane areas 169a 169b 169c along the edge of the opening. The interaction of the flat-topped seal lock underhang with the inclined plane areas of the top panel provides the screw action sealing force.
Variation—Cupped Spring Washer Approach
In any resealing implementation consistent with the principles herein, regardless of the site of the interrupted inclined plane, if any, it may be advantageous to employ curved mating areas. To better apply a continued sealing force, either or both of the top panel regions surrounding the opening and the sealing face of a seal lock assembly could have convex aspects that acted much as a Belleville washer.
Making Particular can Ends Consistent with this Teaching
The implementations described are manufacturable by processes well known to those skilled in the art. Some particular manners of forming a seal lock include:
1—Each “wing” (whether it is 2, 3, or more) is started in the progressive die as a well being stamped into the flat floor of the tab placed close to the edge in strategic locations. The well may be long and narrow, but not necessarily so. After the well is formed for each wing it is then folded over and flattened to the outside of the tab so that it protrudes past the edge of the tab, thus creating an undercut or wing that can grab the underside of the can opening sheet metal once the tab is twisted into sealing position.
2—The sheet metal that the actuator is formed out of is folded under all the way around the perimeter so as to make a rounded edge and not expose a sharp sheet metal edge. In the areas where a wing is called for on the seal lock, the sheet metal is folded back on itself again to then protrude past the edge of the tab. It might be folded back towards the center of the tab again to not expose sharp edges. The sheet metal could be rolled and then flattened so that there are no sharp, raw, or unfinished edges exposed.
3—Separate wing pieces made of the same material as the tab or actuator (aluminum) are spot welded (or otherwise permanently attached) onto the underside of the actuator. These pieces might be folded one or more times so as not to expose any sharp edges.
4—A formable material such as plastic is made into wing shapes and is then attached to the underside of an actuator. This could be a thermoplastic or thermoset material that is molded then attached. Alternatively a thermoset, such as a fast curing UV curing resin, is formed right on the bottom surface of the actuators while they are running through the production line. This might employ a mold to cause the resin to cure in a certain shape. An elastomeric sealant gasket could be pre-made with the wings and then applied to the bottom of the actuator. The wings could be part of the sealant but of a harder durometer material.
5—In the case of a seal lock implementation with a flat overhang rather than angled wings, another method of forming the seal lock would include stamping an elongated post near the edge of seal lock and hitting the “head” of the post to produce a mushroom shape appendage. This manufacturing technique is well known and used in the construction of rivets used in current pop-top units.
Flop-Over VersionsThe previous example implementations provide for rotating into a ready-to-open state. The three particular examples that follow use a “flop-over” action rather than rotation in the plane of the actuator to get into configurations of comparable properties.
Forth Presented Version—Pile Driver—StructureThe so-called pile driver can end design example that is illustrated in
The actuator is shown in its initial position in the plan view of
The third segment of the actuator, the foot support 243, is also shaped as an upside down letter “U”. This smaller U sets within the larger U of the tab 241, both facing in the same direction. The extremities of the foot support U attach to symmetric locations on the actuator base corresponding to the regions of the two flattened peaks of the “W” shaped actuator base. Those attachments are also via living hinges 246a 246b that are openable in the direction towards the top panel 207. The last segment, the foot 217, is generally rectangular. At one end it is hingeably connected 260 to the inside extremity of the tab's upside-down “U” shape. At the foot's opposite end a hinge point 247 connects it to the outside of the foot support's U-shape. The former hinge opens away from the surface of the top panel while the later hinges open towards that panel. Details of the construction of the actuator can vary in numerous ways including being composed of multiple subcomponents.
Pile Driver—Operation
To open a can end 202 of the pile driver design of
As the tab is raised, the hinges 245a 245b between the actuator base 240 and the actuator tab 241 open, allowing the tab end of the actuator to rise from the plane of the top panel 206 with minimal resistance. No structure is yet engaging the tear panel 207. In
This shortening forces the foot 217 and foot support 243 to swing out of the original plane of the actuator. Due to the directionality of the hinges, the direction of this self-erecting triangle is toward the tear panel 207. As seen in
These segments reach this state due to the central portion of the foot support abutting the actuator base 240 and due to the limits on the hinge connecting the tab and the distal end of the foot. As seen in
As continued force is applied to the actuator's face, a secondary hinging within the foot support 243 occurs.
One example, now described, includes a self-erecting foot and resealability, combining characteristics of some designs described above.
Self-Erecting with Reseal—Structure & Operation
This design uses an actuator 304 that is generally oval. Similar to other presented embodiments, the actuator is connected to a can end base 302 by a rivet or pin 311. The present actuator comprises an actuator base 340, a foot 317, a foot support 343, and an actuator body 341 shown in
The actuator body 341 is hingeably attached, at its most central edge, to the actuator base 340 at an edge of the actuator base opposite to the edge to which the foot support 343 is attached. The resulting geometry has similar properties to that of the pile driver detailed above. The actions to lift the actuator and flop it over, thereby erecting a triangular structure, are analogous to those of the pile driver. The ready-to-open state with the foot 317 oriented to facilitate application of normal force to a tear panel 307 is also analogous to that of the pile driver.
Other features differ from the pile driver, but are in common with the resealable version discussed previously herein. The bottom surface of the actuator body 341 is visible in
A stacked bump implementation of a flop-over approach is shown in
An elongated actuator 404 is composed of four sections and is attached flat to the top panel 406. As shown, those four sections are comprised by a single stamped metal part with living hinges interconnecting the sections.
Stacked Bump—Operation
As seen in
In
Those skilled in the art will be aware of materials, techniques and equipment suitable to produce the example embodiments presented as well as variations on the those examples. This teaching is presented for purposes of illustration and description but is not intended to be exhaustive or limiting to the forms disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments and versions help to explain the principles of the invention, the practical application, and to enable others of ordinary skill in the art to understand it. Various embodiments with various modifications as are suited to the particular use contemplated are expected.
In the following claims, the words “a” and “an” should be taken to mean “at least one” in all cases, even if the wording “at least one” appears in one or more claims explicitly. The scope of the invention is set out in the claims below.
Claims
1. A can end for closing a vessel comprising: said actuator so configured and attached to said top panel as to be readily moveable from the initial flat state to a ready-to-open state by one or more user manually engendered translations during which no appreciable opening force is inherently applied to the openable region; a ready-to-open state comprises:
- (a) a generally planer top panel having an inner surface for facing into the vessel and an opposite outer surface, said top panel having an openable region portion that is substantially delimited from other portions of said top panel by a frangible area of weakness, the frangible area being ruptureable by a suitable, normal, opening force;
- (b) an elongated, generally planer actuator, non-removably attached to said top panel such that said actuator is held initially in a substantially flat state against the outer surface of said top panel;
- (c) a foot connected to said actuator, said foot so connected, shaped and configured such that, in the initial state, no portion extends above the plane of the top panel to a degree to effectively impede stackability of can ends;
- i. the major plane of said actuator is at an acute angle to a substantial portion of the openable region,
- ii. said foot is interposed between said actuator and the openable region such that a downward force on said actuator would be mechanically transmitted, through said foot, to the openable region with effective leverage to allow a readily applied degree of manual force to rupture the area of weakness; further, the configuration of foot and actuator is such that sufficient travel is permitted for the downward force to displace the openable area to a degree that effectively opens the can end for dispensing.
2. The can end of claim 1 wherein the one or more manually engendered translations comprise no more than two continuous motions.
3. The can end of claim 1 wherein the one or more manually engendered translations comprise one translation in a single direction that substantially accomplishes the movement from initial state to ready-to-open state.
4. The can end of claim 1 wherein the one or more manually engendered translations includes lifting a distal terminus of said actuator up from the plane of said top panel and through an angle of greater than 90-degrees in a plane substantially perpendicular to the plane of said top panel; further, that lifting inherently engenders a self-assembly of said foot.
5. The can end of claim 1 wherein:
- the one or more manually engendered translations include rotating said actuator about a pivot point in a plane generally at an acute angle of less than 90-degrees to the plane of said top panel;
- further, an effective amount of the actuator rotation inherently places said actuator in a ready-to-open state.
6. The can end of claim 5 wherein the actuator rotating engenders a self-erecting of the foot.
7. The can end of claim 5 wherein:
- the foot is protruding substantially perpendicular from the major plane of said actuator; in the initial flat state said foot extends downward into a depressed area of said top panel to a degree to be effective in allowing said actuator to rest in a flat state;
- further, the depressed area comprises a ramp configuration such that its surface declines at its edge proximate to the center of the can end from the major plane of the outer surface of the top panel to a depth effective to accommodate the full height of said foot when the actuator is in the initial state.
8. The can end of claim 5 further providing an alternate mode of opening comprising:
- the one or more manually engendered translations further include lifting the distal extremity of said actuator up from the plane of said top panel;
- further, the attachment of said actuator to said top panel is such as to constitute a fulcrum providing a degree of freedom of movement such that said actuator being raised by its distal extremity causes its opposite extremity portion move downward toward the openable region to apply an effective leveraged force to rupture the area of weakness.
9. A re-closeable can end comprising:
- (a) a generally planer top panel for covering the cavity of a vessel, said top panel having an inner surface for facing into the cavity and an opposite outer surface; said top panel having a generally co-planer, delimited tear panel portion, the tear panel portion being openable by a rupturing force producing an opening of a substantially predetermined size, shape, orientation, and location;
- (b) an elongated, generally planer actuator attached substantially flat to said top panel's outer surface in an initial state; said actuator having a shallow seal lock protrusion depending from one of its surfaces; further, the seal lock having a size, shape and configuration relative to the size and shape of the opening such that, if unconstrained postionally, the seal lock would be a loose fit in the opening in at least one orientation; further, said actuator so attached to said top panel as to allow at least two distinct degrees of freedom of relative movement comprising: i. a first freedom of movement permitting a manual translation of said actuator from the initial state to a state in which the actuator and opening region are in parallel planes with the seal lock extending through the opening, disposed in a so-called ready-to-seal state; ii. a second freedom of movement permitting, from the ready-to-seal state, a rotational movement pivoting about a point generally central to the seal lock and providing a degree of angular rotation to allow the seal lock to be manually pivoted in-place; further, the portion of the seal lock that is below the inner surface when in the ready-to-seal state has shape comprising an interrupted thread, the twisting of which pulls the actuator sealingly down against the top panel's outer surface that surrounds the opening.
10. The re-closable can end of claim 9 wherein the interrupted thread is comprised of two or more opposed wings forming a helix shape.
11. The re-closable can end of claim 9 wherein said first freedom of movement is rotational in a plane approximately parallel to the major plane of the top panel and centered proximate to the center of said top panel.
12. The re-closeable can end of claim 9 wherein the attachment of said actuator to said top panel is through an arcuate slot in said actuator; the geometry of the arc of that slot has a center proximate to the center of the opening.
13. The re-closeable can end of claim 9, further comprising an elastomeric layer interposed between a surface surrounding the opening and opposed actuator surface portions, when the actuator is sealing against the outer surface.
14. A pop-top can end comprising:
- a generally planer can end base having a region that is openable by application of a suitable degree of an opening force normal to the major plane of that region;
- a lever initially retained flat against the can end base's upper surface;
- said lever being user repositionable to a ready-to-open state without exerting an opening force; wherein the ready-to-open state is of a configuration and orientation such that a readily applied downward force to the lever mechanically transmits an opening force to the opening region with effective leverage and effective throw travel to open the can end.
15. The apparatus of claim 14 further comprising:
- a can vessel that said pop-top can end closes and to which it is secured,
- in combination, comprising a complete can.
16. The can end of claim 14 wherein the ready-to-open state is such that the major plane of the actuator is at an acute angle to the openable region.
17. The can end of claim 14 wherein the repositioning from the initial state to the ready-to-open state is accomplishable in a single motion.
18. A resealable pop-top can end comprising:
- a generally planar base having an openable region, an upper side and a lower side;
- a generally planar tab;
- a lock having a shape and configuration such that when the openable region is open: a lower portion of the lock is insertable into the opening from the upper side with an upper portion of the lock resting on the upper side perimeter of the opening; from that state, an appropriate manual manipulation applied only on the upper side of said base can bring aspects of the inserted portion forcefully into contact with the lower side with a face such that the upper seal portion is sealingly pressed against the upper side proximate to the perimeter of the opening;
- further, the lock is an aspect of the generally planer tab, the major plane of which is initially secured flat to the base.
19. The can end of claim 18 wherein said tab is configured to also be useable as a lever in applying a force tending to open the can end.
20. The can end of claim 18 wherein the securement of said tab to said base is at a single pivot point, and further, said appropriate manual manipulation is a rotation about the center of the opening region which engages an inclined plane, situated in a plane generally perpendicular to that of the open region, with an opposing structure to urge a sealing force.
21. The can end of claim 20 wherein said inclined plane is an aspect of the lower portion of the seal lock.
22. The can end of claim 20 wherein said inclined plane is an aspect of the underside of the base, proximate to the perimeter of the opening.
23. A readily openable can end with resealability comprising:
- a generally planer can end with an upper surface and having an openable region that is openable by application of a suitable degree of an opening force normal to the major plane of that region;
- a lever initially attached flat against the can end's upper surface;
- said lever user-repositionable to a ready-to-open state without exerting an opening force;
- wherein the ready-to-open state is of a configuration and orientation such that a readily applied downward force to the lever mechanically transmits an opening force with adequate leverage and throw to open the can end;
- further, said lever has a seal lock region protruding generally perpendicular to its major plane,
- said seal lock having an interrupted thread feature, and being sized and shaped as to be a loose fit in the openable region when open;
- the attachment of the base and actuator having a degree of freedom of movement allowing the actuator to be user-repositionable to place the protrusion into the opening, achieving a so-called ready-to-seal state;
- the retention of actuator to base is such that an additional degree of freedom of movement is provided in the ready-to-seal state to allow and guide the seal lock to be rotatable in-place, about its center;
- the seal lock, its interrupted thread feature, and opening, together being so shaped and configured such that a rotation about the center of the seal lock engenders a force from the threads against the underside of the can end that surrounds the opening;
- the force tending to pull the tab against the base to seal the opening.
24. A can end as in claim 23 wherein said actuator is repositionable to said ready-to-open state by lifting the actuator extremity in a flop-over motion and separately is positionable into, and out of, the ready-to-seal state by its rotation substantially in the plane of the can end about a point proximate to the center of the base; further, said interrupted thread feature comprises at least two wings in a configuration of a helix.
25. A method of opening a pop-top can comprising:
- i. initiate rotation of a tab in a plane roughly parallel to that of a can end about a point generally central to the can end,
- ii. raising the extremity of the tab an effective distance from the surface of the can end as a mechanical side-effect of said rotation,
- iii. pressing downward on the tab;
- iv. opening the can as a consequence of forces transmitted via a rigid foot from said pressing downward on the tab.
26. The can opening method of claim 25 further comprising a ramped floor aspect of the can end and an actuator aspect that is an elongated post generally perpendicular to the major plane of the actuator, and
- wherein said rising is urged by said post's interaction with the ramped floor upon which it rests.
Type: Application
Filed: Aug 11, 2009
Publication Date: Feb 4, 2010
Inventors: Jonathan H. Hoffman (Malibu, CA), Matthew Lazich (Los Angeles, CA)
Application Number: 12/583,008
International Classification: B65D 17/34 (20060101); B65B 43/38 (20060101);