Drinking containers
View Patent ↗A disposable child's drinking cup has a lid with a drinking spout defining multiple open holes sized to resist leakage in the absence of suction, such as by the development of surface tension at the holes, and to allow flow when suction is applied. The holes are formed during molding of the lid. An inner contour of a groove of the lid and an outer contour of the cup body rim are selected to provide a slight snap fit of the lid onto the cup body, to provide a secure seal.
1. A drinking container comprising
a main body defining an interior cavity accessible through a cavity opening at an upper end of the main body, the body having a rim about its opening, the rim having a domed upper surface and inner and outer walls defining a recess therebetween, the outer wall of the rim having a lower, distal edge spaced apart from the inner wall to define a recess opening; and
a removable lid secured to the main body at its upper end to cover the cavity opening and enclose, together with the main body, the interior cavity to hold a liquid, the lid defining a groove about its edge sized to receive and snap over the rim of the main body and form a seal;
the lid having an extended drinking spout sized to be received within a human mouth and defining at least one hole providing hydraulic communication between exterior surfaces of the container and the interior cavity, for dispensing liquid disposed proximate an, inner end of the hole in response to a vacuum applied at an outer end of the hole; wherein
the groove about the lid has an inner surface, and the rim of the main body has an outer surface, that each define semi-circular arcs of similar radii and have interlocking features on an inboard side, the interlocking features including
a first lip projecting radially outward from the lid into the groove and
a second lip projecting radially inward from the outer surface of the rim of the main body to produce a nominal radial interference between the first and second lips as the lid and main body are engaged.
2. The drinking container of claim 1 wherein the first lip protrudes about 0.008 inch laterally into the groove from a vertical tangent to an inner edge of an upper, inner surface of the groove.
3. The drinking container of claim 1 wherein the second lip protrudes about 0.008 inch toward a centerline of the main body from a vertical tangent to an inner edge of the outer surface of the rim.
4. The drinking container of claim 1 wherein the nominal radial interference between the first and second lips is about 0.016 inch.
5. The drinking container of claim 1 wherein the lid further comprises at least one snap ridge extending downwardly and inwardly from an outer edge of the groove and positioned to snap below the lower, distal edge of the cup rim when the main body and lid are fully engaged.
6. The drinking container of claim 5 wherein the lid includes a bending tab extending radially outward near one of the snap ridges.
7. The drinking container of claim 1 wherein both the lid and main body have nominal molded thicknesses of less than about 0.035 inch.
8. The drinking container of claim 7 wherein the nominal molded thicknesses of both the lid and main body are between about 0.020 and 0.026 inch.
9. The drinking container of claim 1 having an empty weight less than about 30 grams.
10. The drinking container of claim 9 wherein the empty weight is less than about 20 grams.