Dispensing – With plural openings or discharge guides – Hand-manipulable shaker – diverse-type openings
Reissue Patent
1996-10-23
2002-04-09
Kaufman, Joseph A. (Department: 3754)
Dispensing
With plural openings or discharge guides
Hand-manipulable shaker, diverse-type openings
C220S254800, C220S826000, C215S235000, C215S237000
Reissue Patent
active
RE037634
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates to closures for containers, and more particularly to injection-molded plastic closures with hinged reclosable flaps.
PRIOR ART
Shake-and-spoon closures for dispensing condiments and the like are generally known in the industry. Typically, such closures take the form of round caps with a pair of semicircular or nearly semicircular flaps. One flap selectively closes and opens a plurality of relatively small apertures for shaking or sifting a pourable product from the container. The other flap selectively closes and opens a relatively large opening in the cap used for spooning product out of the container. Often the cap includes an internally threaded skirt which mates with threads on the mouth of a container for purposes of securing the closure to the container.
In certain prior art shake-and-spoon closures of the type described, the spoon opening has been limited to less than half of the mouth opening of the container. This restricted size can be inconvenient in certain instances, such as in commercial establishments and institutions where relatively large spoons are used by a cook. A more subtle problem with shake-and-spoon closures faceed by the manufacturer is the tendency of the closure to take an out-of-round or oval set when released from the mold. The cause of this ovality is the non-symmetry of the cap to an absence of plastic stock on one side of the closure where the spoon aperture exists and substantial stock on the other side exits to surround the small shake apertures. Because of the non-symmetry of the plastic mass, thermal shrinkage is uneven. Resultant ovality can detract from the appearance of the container and closure, cause problems in automatic container capping machines, make it difficult to achieve a good seal with the mouth of the container, and increase the difficulties of providing reliable retention of the flaps in the closed positions. In general, each of these problems tends to be aggravated where the size of the spoon aperture is increased at the expense of the cap area allotted to the shake apertures. Certain prior art closures have included a rib on the spoon flap parallel to the hinge that functions to stiffen the flap and contributes to the sealing action on the spoon aperture. This rib can have the disadvantage of obstructing, and thereby lessening, the effective size of the spoon aperture.
SUMMARY OF THE INVENTION
The invention provides an injection-molded plastic shake-and-spoon closure which has a proportionately large, unrestricted spoon aperture, and which reduces quality-related problems found in prior art products. The closure includes novel catch means associated with the aperture cover flaps that produce consistent retention and release action and is relatively tolerant of dimensional variations due to thermal shrinkage and any tendency towards ovality of the molded parts. In accordance with the invention, the flaps are formed with a wall thickness substantially equal to the nominal wall thickness of the remainder of the closure and are devoid of heavy stiffening ribs. The non-rigid flap structure permits it to be opened in a peeling motion so that the forces of individual catches are encountered progressively as the flap is opened, whereby the high total retention force need not be overcome at once. The disclosed closures include a wide internal sealing ledge which ensures that the closure will positively seal the mouth of a container, regardless of any expected degree of ovality. A land area between the spoon and shake apertures has the same elevation as the sealing ledge. This land area can provide support for intermediate areas of a paper seal which can be particularly important when the seal is stamped into the closure by automatic high speed equipment.
REFERENCES:
patent: 3493150 (1970-02-01), Lucas et al.
patent: 4163496 (1979-08-01), Dogliotti
patent: 4223814 (1980-09-01), Sneider
patent: 4284200 (1981-08-01), Bush et al.
patent: 4361250 (1982-11-01), Foster
patent: 4369901 (1983-01-01), Hidding
patent: 4463869 (1984-08-01), Lewis
patent: 4494679 (1985-01-01), Cleevely
patent: D278602 (1985-04-01), Rosenstein
patent: 4545508 (1985-10-01), Cribb, Jr. et al.
patent: 4580687 (1986-04-01), Lewis
patent: D305206 (1989-12-01), Hickman et al.
patent: 4936494 (1990-06-01), Weidman
Opinion & Order, Ang. 30, 1996.
Motion Under Rule 52(b) by Weatherchem (On-Sale).
Memorandum in Support of Weatherchem's Motion Under Rule 52(b) (On-Sale).
Motion Under Rule 52(b) By Weatherchem (Number of Ribs).
Memorandum in Support of Weatherchem's Motion Under Rule 52(b) (Number of Ribs).
J. L. Clark's Memorandum in Opposition to Weatherchem's Motion Under Rule 52(b) (On-Sale).
J. L. Clark's Memorandum in Opposition to Weatherchem's Motion Under Rule 52(b) (Number of Ribs).
Weatherchem's Reply to Clark's Opposition of the Rule 52(b) Motion (On-Sale).
Weatherchem's Reply to Clark's Opposition of the Rule 52(b) Motion (Number of Ribs).
Opinion and Order dated Sep. 29, 1997.
Defendants Trial Exhibit 1165 CA#1:91CV0035.
Hickman John R.
Kriska Nickolas J.
Weidman Craig C.
Kaufman Joseph A.
Weatherchem Corporation
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