An injection-molded thermoplastic closure with shake-and-spoon apertures and associated flaps for selectively closing and opening the apertures. The flaps are releasably retained in their closed positions by catch elements which provide retention forces that are relatively insensitive to dimensional and shape variations in the body resulting from the molding process. In one embodiment, the cap has "freeze points" and a gate location that reduce the tendency of the cap to assume an oval condition when cooled from molding temperatures. A wide sealing ledge cooperates with a central support for a liner seal positioned in the cap to seal the mouth of a container.
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14. A two-mode dispensing cap for a container comprising an injection-molded thermoplastic one-piece body, the body having a generally circular end wall, the end wall having a spoon dispensing side and a shake dispensing side, the shake dispensing side including a plurality of relatively small apertures for dispensing therethrough a pourable product carried in the container, the spoon dispensing side including a relatively large aperture of a size sufficient for allowing passage of a spoon therethrough for spooning out product, a chordal land area between the spoon and shake sides, each of said sides having an associated flap hinged on said land, the flap of the shake side being arranged to selectively close or open relatively small apertures, the flap of the spoon side being arranged to selectively close said relatively large aperture, the thickness of the cap at the ends of the land area being substantially less than the average thickness of the land area whereby the plastic material in such end areas freezes at a relatively early stage in a molding cycle to reduce the tendency of the cap to assume an oval condition.
1. A two-mode dispensing cap for a container comprising an injection-molded thermoplastic one-piece body, the body having a generally circular end wall, the end wall having a spoon dispensing side and a shake dispensing side, the shake dispensing side including a plurality of relatively small apertures for dispensing therethrough a pourable product carried in the container, the spoon dispensing side including a relatively large aperture of a size sufficient for allowing passage of a spoon therethrough for spooning out product, each of said sides having an associated hinged flap, the flap of the shake side being arranged to selectively close relatively small apertures, the flap of the spoon side being arranged to selectively close said relatively large aperture, the spoon flap having a free edge defining with the line of the associated hinge substantially the full boundary of the spoon flap, the spoon flap including catch means spaced along a line adjacent its free edge, the catch means being arranged to releasably secure the spoon flap in a closed position relative to the spoon aperture and extending along said adjacent line a distance substantially at least as great as one-half of the length of the free edge whereby the flap is uniformly retained along its free edge.
9. A two-mode dispensing cap for a container comprising an injection-molded thermoplastic one-piece body, the body having a generally circular end wall, the end wall having a spoon dispensing side and a shake dispensing side, the shake dispensing side including a plurality of relatively small apertures for dispensing therethrough a pourable product carried in the container, the spoon dispensing side including a relatively large aperture of a size sufficient for allowing passage of a spoon therethrough for spooning out product, each of said sides having an associated hinged flap, the flap of the shake side being arranged to selectively close or open relatively small apertures, the flap of the spoon side being arranged to selectively close or open said relatively large aperture, one of said flaps having a generally uniform wall thickness not substantially greater than the nominal wall thickness of the remainder of the cap and being free of significant stiffening structure, a plurality of individual catch means spaced on a lower face of the flap, the catch means being arranged to releasably secure the flap in a closed position, the flap being sufficiently flexible to allow it to be peeled open manually by overcoming the retention forces of said catch means progressively with the force of fewer than all of the catches being overcome at any given time.
0. 35. A two-mode dispensing cap for a container comprising an injection-molded thermoplastic one-piece body, the body having a generally circular end wall, the end wall having a spoon dispensing side and a shake dispensing side, the shake dispensing side including a plurality of relatively small apertures for dispensing therethrough a pourable product carried in the container, the spoon dispensing side including a relatively large aperture of a size sufficient for allowing passage of a spoon therethrough for spooning out product, each of said sides having an associated hinged flap, the flap of the shake side being arranged to selectively close or open relatively small apertures, the flap of the spoon side being arranged to selectively close said relatively large aperture, an internally threaded skirt depending from the perimeter of said end wall, an annular sealing ledge on the lower side of the end wall interior of said skirt, the sealing ledge having a flat surface extending radially a distance substantially equal to at least twice the nominal wall thickness of the cap, and catch structure for releasably retaining the spoon flap closed against accidental opening, the catch structure including surface area that produces a gripping action between an area on the end wall and an area on the spoon flap when the spoon flap is closed, the spoon flap area engaged in the gripping action underlying the end wall area engaged in the gripping action and thereby creating an axially interfering fit to hold said spoon flap closed.
0. 16. A two-mode dispensing cap for a container comprising an injection-molded thermoplastic one-piece body, the body having a generally circular end wall, the end wall having a spoon dispensing side and a shake dispensing side, the shake dispensing side including a plurality of relatively small apertures for dispensing therethrough a pourable product carried in the container, the spoon dispensing side including a relatively large aperture of a size sufficient for allowing passage of a spoon therethrough for spooning out product, a chordal land area between the spoon and shake sides, each of said sides having an associated flap hinged on said land, the flap of the shake side being arranged to selectively close or open said relatively small apertures, the flap of the spoon side being arranged to selectively close said relatively large aperture, an internally threaded skirt depending from the perimeter of said end wall, an annular sealing ledge on the lower side of the end wall interior of said skirt, the land area having a lower surface generally coplanar with said sealing ledge and adapted to cooperate with said sealing ledge to support a sealing sheet received in said cap, and catch structure for releasably retaining the spoon flap closed against accidental opening, the catch structure including surface area that produces a gripping action between an area on the end wall and an area on the spoon flap when the spoon flap is closed, the spoon flap area engaged in the gripping action underlying the end wall area engaged in the gripping action and thereby creating an axially interfering fit to hold said spoon flap closed.
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0. 12. A two-mode dispensing cap for a container comprising an injection-molded thermoplastic one-piece body, the body having a generally circular end wall, the end wall having a spoon dispensing side and a shake dispensing side, the shake dispensing side including a plurality of relatively small apertures for dispensing therethrough a pourable product carried in the container, the spoon dispensing side including a relatively large aperture of a size sufficient for allowing passage of a spoon therethrough for spooning out product, a chordal land area between the spoon and shake sides, each of said sides having an associated flap hinged on said land, the flap of the shake side being arranged to selectively close or open said relatively small apertures, the flap of the spoon side being arranged to selectively close said relatively large aperture, an internally threaded skirt depending from the perimeter of said end wall, an annular sealing ledge on the lower side of the end wall interior of said skirt, the land area having a lower surface generally coplanar with said sealing ledge and adapted to cooperate with said sealing ledge to support a sealing sheet received in said cap.
0. 13. A two-mode dispensing cap for a container comprising an injection-molded thermoplastic one-piece body, the body having a generally circular end wall, the end wall having a spoon dispensing side and a shake dispensing side, the shake dispensing side including a plurality of relatively small apertures for dispensing therethrough a pourable product carried in the container, the spoon dispensing side including a relatively large aperture of a size sufficient for allowing passage of a spoon therethrough for spooning out product, each of said sides having an associated hinged flap, the flap of the shake side being arranged to selectively close or open relatively small apertures, the flap of the spoon side being arranged to selectively close said relatively large aperture, an internally threaded skirt depending from the perimeter of said end wall, an annular sealing ledge on the lower side of the end wall interior of said skirt, the sealing ledge having a flat surface extending radially a distance substantially equal to at least twice the nominal wall thickness of the cap.
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Referring now to the drawings, a first embodiment of a two-flap closure or cap 10 constructed in accordance with the invention is shown in
Each of the spoon and shake sections 14, 15 has an associated flap 19, 20 that covers the major part of its respective section. The spoon section 14 includes a D-shaped aperture 21 of generous proportions. The aperture 21 is bounded by an arcuate planar ledge or flange 22 that extends radially inwardly from an upper end of the skirt 11. The outward profile of the ledge 22 is generally D-shaped and corresponds to a D-shaped outer profile of the spoon flap 19.
The spoon flap 19 is integrally joined to the chordal land area 16 by a living hinge 23. The hinge 23 is formed by a relatively thin wall section extending in a straight line across a fixed edge 25 of the flap 19 adjoining an edge of the land 16. An arcuate sealing lip 24 is provided on a lower face 26 of the spoon flap 19. The lip 24 is spaced inwardly from the free edge, designated 27, of the spoon flap 19, and is arranged, when the flap is closed, to fit closely adjacent the arcuate edge of the spoon aperture 21 to avoid sifting of material out of the container at this point. The cross section of the lip 24, aside from a plurality of associated, spaced catches 28, is relatively small in cross section to avoid significant flexural stiffening of the spoon flap 19.
As shown, the lip depth and thickness are not significantly greater in dimension than the nominal wall thickness of the entire cap 10. In the illustrated case, for example, the nominal wall thickness of the cap is 0.050 inch, the lip depth is 0.079 inch, and the lip thickness is 0.035 inch. The lip 24 runs parallel to the free edge 27 of the flap 19 and is absent along the fixed line of the hinge 23.
The spoon flap or lid 19 is retained in a closed position with its lower face 26 against the ledge 22 by the catches 28, which grip the underside 32 of the ledge. A typical catch 28 is illustrated in section in FIG. 4. The catch 28 is spaced from the plane of the flap 19 and projects outwardly from the lip 24 in a direction away from the hinge 23 to provide a camming surface 29 and a gripping surface 31. The camming surface 29 lies in a plane oblique to the plane of the flap 19, while the gripping surface 31 is in a plane generally parallel to the flap. The catches 28 are substantially identical and are four in number. As seen in
The shake flap 20, like the spoon flap 19, is integrally joined to the chordal land area 16 by a living hinge 36 extending in a straight line across a fixed edge 37 of the flap and the land area. The flap 20 has a D-shaped profile in plan view. The shake section 15 includes a web 38 which underlies the flap 20 and has a configuration generally corresponding to the profile of the flap. The web 38 has a plurality of spaced, preferably round apertures 39 suitable for dispensing material by sifting or shaking from the assembled container. The shake flap 20 has a plurality of hollow plugs 43 arranged in a pattern which corresponds to that of the apertures 39 so that when the flap is closed against the web 38, each of the plugs 43 is received in a respective aperture 39. Ideally, each plug 43 has the shape of an inverted, generally circular cup, and is dimensioned to fit tight enough in its respective aperture to prevent sifting when the flap is closed. Lower ends of the plugs 43 are tapered at 44 to facilitate entry into the apertures 39 when the flap is closed.
A plurality of the plugs 43, in the illustrated case, those proximal to a free edge 46 of the flap 20 and identified with the suffix "A", are shaped with individual catch means 47. The plug catch means 47 includes a conical camming surface 48 and a gripping area or undercut 49. The camming surface 48 and gripping area 49 are centered on an axis eccentric from the axis of the associated plug 43 so that they exist only on a side of the plug remote from the hinge 36. The camming surfaces 48 work against the edges of the apertures 39 to allow the catch means 47 to slip under the web 38. The catch gripping area 49 of each associated plug 43 engages the underside of the web 38 to releasably retain the flap 20 in its closed position, resting on the web 38.
The disclosed cap 10 features a relatively large spoon aperture 21 in proportion to the total plan area of the cap, which is a convenience particularly at commercial or institutional sites where large spoons may be used. The large spoon opening 21 presents difficulty in the manufacture of the cap because it tends to induce the cap to assume an oval shape when released from the mold and cooled to ambient temperature. This tendency is a result of the non-symmetry or balance of material in the plane of the end wall 13 introduced by the aperture 21. The cap material cools from molding temperatures in an uneven manner, and consequently sets in an unintended oval condition. Parts produced in a multi-cavity mold typically exhibit other dimensional variations which add to the difficulties faced by the manufacturer of the cap in producing parts of consistent performance. The tendencies to assume an oval shape and exhibit variations in size present potentially serious difficulties in producing a cap with flaps that snap closed and open with application of moderate manual forces.
Dimensional or shape variation in a cap can potentially make the flap retention forces too high or too low. The disclosed cap construction provides a structure in which the cap opening and closing forces are advantageously relatively insensitive to normally expected size or shape variations. The spoon flap 19, despite its relatively large size, is retained in its closed position, with its underside 26 resting on the ledge 22 by the series of catches 28 spaced on the line of the lip 24 parallel to the free edge 27 of the flap. Once closed, the total force holding the flap 19 is the sum of the retention forces of the individual catches 28. This total force can be relatively high by suitably dimensioning the catches 28 to resist accidental opening of the flap 19 during shipment or handling of the container. The opening forces encountered by the user are relatively low, since, in accordance with the invention, the flap 19 can be progressively opened, one or two catches at a time, in a peeling fashion. The flap 19, being relatively thin and devoid of any stiffening structure but for the lip 24, which is relatively small in cross section, can flex about axes of curvature both perpendicular and parallel to the hinge 23. Thus, an opening force supplied to the underside of the flap 19 in the area of the bevel 33 is effective to unsnap one or both of the adjacent catches 28, while flexure of the flap allows the catches remote from the bevel to temporaily remain latched. Further application of lifting force, but not necessarily at substantially higher values, causes the catches 28 remote from the bevel 33 to snap and release their holds.
Preferably, the flap 19 is flexible enough in relation to the retention forces of the catches 28 to allow it to assume a static condition, with the outward catches under the ledge 22 and the inward catches over the ledge. This capability demonstrates the peelability of the flap 19, where the central catches can be first released by flexing the flap and then the remaining catches can be released by continued lifting force on the flap. The disclosed spacing of the catches 28 along a line that is a substantial portion of the length of the free edge 27 of the flap 19 ensures that the flap is retained uniformly throughout its full area. The effects of any unintentional ovality in the shape of the cap 10 on the security of the flap 19 are reduced, since the flap is held closed by the catches 28 at a plurality of points and their redundancy offers a safety factor where at least some of the catches will fit snugly against an adjacent edge of the aperture 21.
The individual catches 28 can be normally dimensioned to provide a relatively large interference fit at local points on the aperture 21 to ensure that at least some retention force to maintain the flap closed is available where unintentional ovality occurs in a cap and reduces the actual interference fit of the catch 28 from a nominal or desired degree of interference. Even where unintended ovality in a cap 10 increases the interference of the fit of a catch 28, a user will not experience excessive resistance to opening or closing of the flap. Since the flap is devoid of substantial rigidifying structure, it can resiliently buckle or flex to allow the catches 28 to pass over the edge of the aperture 21. From the above discussion, it is seen that the spoon flap 19 and associated catches 28 are dimensionally forgiving or tolerant of manufacturing variation in size and shape.
The shake flap 20 is releasably retained in a closed position against the web 38 by the plug catch means 47. The catches 47 are dimensionally tolerant in a manner similar to that of the catches 28 on the spoon flap 19 such that dimensional variations, including unintended ovality, are tolerated without excessive or marginal forces being experienced in opening or closing the flap. The flap 20 is relatively flexible, having a thickness generally equal to the nominal wall thickness of the cap and being devoid of auxiliary ribs or other stiffening structure. In ways similar to the catches 28 on the spoon flap 19, the catches 47 provide a degree of safety of closure from their redundancy. The distribution of retention points across a major portion of the area of the flap 20 ensures that the flap will be held down across its full extent to resist sifting. With its capacity to buckle or flex slightly, the flap 20 can permit opening or closing movement of the plug catches 47 in and out of their respective apertures without the need for excessive manual effort. The resilient flexibility of the flap 20 is demonstrated by its ability to have a single catch 47 or a limited number of catches to be caught in a respective aperture or apertures while remaining plugs are not caught in their respective apertures.
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A second embodiment of the invention is illustrated in
It is believed that these reduced wall thickness areas or zones 111 form "freeze points" at which relatively quick setting of molten plastic material occurs during the molding cycle. Further, it is believed that the quick setting of material at these points tends to lock or spatially fix the body of the cap 110 at these points and force any subsequent thermal shrinkage to occur elsewhere as a sink in the bar 113 or other parts of the body of the cap which do not directly produce ovality and which, in practice, are essentially visually imperceptible.
The cap or closure 110 is molded with a gate at the midlength of the underside of the rib 113 of the land 16'. A vestige 116 of the gate is illustrated in
While the invention has been shown and described with respect to particular embodiments thereof, this is for the purpose of illustration rather than limitation, and other variations and modifications of the specific embodiments herein shown and described will be apparent to those skilled in the art all within the intended spirit and scope of the invention. Accordingly, the patent is not to be limited in scope and effect to the specific embodiments herein shown and described nor in any other way that is inconsistent with the extent to which the progress in the art has been advanced by the invention.
Weidman, Craig C., Hickman, John R., Kriska, Nickolas J.
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Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc |
Oct 23 1996 | Weatherchem Corporation | (assignment on the face of the patent) | / | |||
Nov 28 2012 | Weatherchem Corporation | MADISON CAPITAL FUNDING LLC, AS AGENT | SECURITY AGREEMENT | 029405 | /0094 | |
Oct 04 2021 | MADISON CAPITAL FUNDING, LLC | Mold-Rite Plastics, LLC | RELEASE PATENT SECURITY INTERESTS | 057748 | /0174 | |
Oct 04 2021 | MADISON CAPITAL FUNDING, LLC | STULL TECHNOLOGIES LLC | RELEASE PATENT SECURITY INTERESTS | 057748 | /0174 | |
Oct 04 2021 | MADISON CAPITAL FUNDING, LLC | Weatherchem Corporation | RELEASE PATENT SECURITY INTERESTS | 057748 | /0174 |
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