Drinking cup lid

A drinking cup lid, comprising: a center cover portion; a rib ring formed at the external circumferential edge of the center cover portion, the rib ring having a drinking recess, the external edge of the drinking recess being open while an insertion opening is disposed at the internal edge thereof, the bottom surface of the drinking recess being provided with a drinking opening; a vent hole formed in the center cover portion or in the rib ring; a snap ring portion formed at the external circumferential edge of the rib ring for a snap fit to the drinking cup; and a plug connected by a flexible strip in a hanging way to the external circumferential edge of the snap ring portion, the plug having a plug portion, a hand-held portion and an insert portion. Before use, the insert portion of the plug is fitted first into the insertion opening. Thereafter, the plug portion is fitted to the drinking opening. In this way, the laborious plug-and-pull problem of the conventional splash proof plug is resolved. As a result, the splash proof plug according to the invention can achieve an effort-saving plug-and-pull effect.

BACKGROUND OF THE INVENTION

(a) Field of the Invention

The present invention relates to a drinking cup lid, and more particularly to a plug that prevents the beverage from splashing from the drinking recess and achieves an effort-saving plug and pull effect when fitted to the drinking recess.

(b) Description of the Related Art

U.S. Pat. No. 7,954,659 B2 discloses a lid for attachment to a disposable drinking cup. A disc of the drinking cup lid has a well and a plug fits to the well in the friction-fit/snap-fit relationship. The well is provided with a fluid opening. The plug is connected to the peripheral edge of the disc by a pair of support arms such that the plug can be inserted into the well for preventing the beverage from splashing from the well. When the plug is removed from the well, this allows drinking from the top circumferential edge of the well. At the same time, the plug stays in connection with the peripheral edge of the disc by the support arms so that the plug won't be lost.

However, the plug is secured to the well simply in the friction-fit/snap-fit relationship. In order to prevent the plug from an accidental detachment, a high strength of the friction fit must exist between the well and the plug. The high-strength friction fit ensures that it is more difficult to remove the plug from the well or to insert the plug into the well. Accordingly, the use is more laborious. In addition, the support arms are bent in a curved shape when the plug is inserted into the well. As a result, the resilience created by the pair of the support arms will produce a force for pulling the plug up from the well. Therefore, the friction fit between the well and the plug has to be increased to some extent. In this case, the plug will be more difficultly removed from the well or inserted into the well. Furthermore, the drinking at the top circumferential edge of the well can be conducted only when the drinking cup is maintained at a relatively large elevation angle so that the fluid can be flow out from the top circumferential edge of the well. Meanwhile, the user has to retract the head at a large angle in drinking, thereby causing an uncomfortable drinking position.

SUMMARY OF THE INVENTION

Therefore, a primary object of the present invention is to provide a drinking cup lid having a splash proof plug that resolves the laborious plug-and-pull problem of the conventional splash proof plug and achieves an effort-saving plug and pull effect.

A secondary object of the present invention is to provide a drinking cup lid that achieves a convenient drinking effect.

According to the invention, a drinking cup lid comprises: a center cover portion; a rib ring formed at the external circumferential edge of the center cover portion, the rib ring having a drinking recess, the external edge of the drinking recess being open while an insertion opening is disposed at the internal edge thereof, the bottom surface of the drinking recess being provided with a drinking opening; a vent hole formed in the center cover portion or in the rib ring; a snap ring portion formed at the external circumferential edge of the rib ring for a snap fit to the drinking cup; and a plug connected by a flexible strip in a hanging way to the external circumferential edge of the snap ring portion, the plug having a plug portion, a hand-held portion and an insert portion. Before use, the insert portion of the plug is fitted first into the insertion opening. Thereafter, the plug portion is fitted to the drinking opening. In this way, the laborious plug-and-pull problem of the conventional splash proof plug is resolved. As a result, the splash proof plug according to the invention can achieve an effort-saving plug-and-pull effect.

According to the invention, a positioning blind hole is formed at the center cover portion or at the rib ring. In drinking, the plug is positioned in the positioning blind hole by the plug portion.

According to the invention, the insertion opening has an upward elevation θ from inside to outside.

According to the invention, the hand-held portion of the plug is extended downward and formed at the external circumferential edge of the plug portion. The positioning blind hole is formed in an upward projecting way at the center cover portion. The center cover portion includes a recessed area corresponding to the hand-held portion. The vent hole is formed at the recessed area.

According to the invention, before use, the plug is temporarily connected by a connection point to the external circumferential edge of the snap ring portion.

According to the invention, the rib ring is formed in an upwardly tapered way.

According to the invention, the insert portion of the plug is fitted first in an inclined position into the insertion opening at the internal edge of the drinking recess before use in a splash proof position. Then, the plug portion is fitted to the drinking opening. In addition to the friction fit to the drinking opening, the plug is also exposed to the pressing force of the insertion opening. Due to the existence of the pressing force of the insertion opening, the strength of the friction fit of the plug portion of the plug to the drinking opening can be relatively reduced. It means that the plug can be pulled out of the drinking recess and fitted to it with less effort. In other words, the splash proof plug achieves an effort-saving plug and pull effect.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

With reference toFIGS. 1 through 3, a drinking cup lid has a center cover portion10, a rib ring20, a vent hole11, a positioning blind hole12, a snap ring portion30, and a plug40.

The rib ring20is formed in an upwardly tapered way at the external circumferential edge of the center cover portion10. The rib ring20includes a drinking recess21. The external edge of the drinking recess21is open while an insertion opening22is disposed at the internal edge thereof. The insertion opening22has an upward elevation θ from inside to outside. The bottom surface of the drinking recess21is provided with a drinking opening23.

The vent hole11is formed in the center cover portion10or in the rib ring20.

The positioning blind hole12is formed in an upward projecting way at the center cover portion10or at the rib ring20.

The snap ring portion30is formed at the external circumferential edge of the rib ring20for a snap fit to the drinking cup.

The plug40is connected by a flexible strip41in a hanging way to the external circumferential edge of the snap ring portion30. Moreover, the plug40is temporarily connected by a connection point42to the external circumferential edge of the snap ring portion30. The plug40includes a plug portion43, a hand-held portion44and an insert portion45. The hand-held portion44is extended downward and formed at the external circumferential edge of the plug portion43. The center cover portion10includes a recessed area13corresponding to the hand-held portion44. The vent hole11is formed at the recessed area13.

As shown inFIG. 4, the drinking cup lids can be stacked for storage due to the tapered design of the rib ring20before use. The plug40is temporarily connected by a connection point42to the external circumferential edge of the snap ring portion30. In use, the connection point42can be disconnected by a slight force to terminate the temporary connection between the plug40and the snap ring portion30. In this way, the plug40can be connected in a hanging way by the flexible strip41to the external circumferential edge of the snap ring portion30so that the plug40won't be lost. As shown inFIGS. 5 through 8, the insert portion45of the plug40is fitted first in an inclined position into the insertion opening22at the internal edge of the drinking recess21before use. Then, the plug portion43is fitted to the drinking opening23such that the beverage won't splash out of the drinking opening23. As shown inFIG. 9, the plug40can be pulled out of the drinking recess21for drinking. Thereafter, the plug40is the plug40is inserted in the positioning blind hole12.

Therefore, the insert portion45of the plug40is fitted first in an inclined position into the insertion opening22at the internal edge of the drinking recess21before use in a splash proof position. Then, the plug portion43is fitted to the drinking opening23. In addition to the friction fit to the drinking opening23, the plug40is also exposed to the pressing force of the insertion opening22. Due to the existence of the pressing force of the insertion opening22, the strength of the friction fit of the plug portion43of the plug40to the drinking opening23can be relatively reduced. It means that the plug40can be pulled out of the drinking recess21and fitted to it with less effort. In other words, the splash proof plug achieves an effort-saving plug and pull effect. Moreover, the flexible strip41of the plug40won't produce a pull-up force to remove the plug40from the drinking recess21. Unlike the prior art (U.S. Pat. No. 7,954,659B2) having the pull-up force, it is not required to increase the strength of the friction fit between the plug portion43of the plug40and the drinking opening23to offset the above-mentioned pull-up force. Accordingly, the splash proof plug achieves an effort-saving plug and pull effect. In addition, the external edge of the drinking recess21is open to achieve an easy flow out of the beverage from the open surface of the drinking recess21for a convenient drinking.