Lid for container

Abstract

A lid cooperates with a container to define a receiving space, and includes a cover portion, a connecting portion, and a mouth portion. The cover portion includes a supporting wall, a connecting wall, and an intermediate wall interconnecting inner edges of the supporting and connecting walls. The connecting portion is connected to a periphery of the cover portion for detachable connection with a mouth portion of the container. The mouth portion includes a mouth inner wall cooperating with the connecting wall and the intermediate wall to define a buffer space. The buffer space has opposite wide and narrow space areas. The mouth inner wall has a middle arcuate portion facing the wide space area, and two side arcuate portions each connected between one end of the middle arcuate portion and a portion of the inner edge of the supporting wall.

What is claimed is: 
     
         1 . A lid for a container, said lid being configured to cooperate with the container to define a receiving space, said lid comprising:
 a cover portion including a supporting wall, a connecting wall having a position difference with said supporting wall along a first axis, and an intermediate wall interconnecting inner edges of said supporting wall and said connecting wall said connecting wall having an outlet for communicating said receiving space with the outside;   a connecting portion connected to a periphery of said cover portion and configured to detachably connect with a mouth portion of the container; and   a mouth portion including a mouth inner wall connected to and extending upwardly from an outer edge of said connecting wall along the first axis, wherein said mouth inner wall, said connecting wall and said intermediate wall cooperatively define a buffer space having an opening configured to be opposite to the container, said buffer space having a wide space area and a narrow space area opposite to said wide space area, said wide space area having a maximum width along a second axis substantially perpendicular to the first axis that is greater than a maximum width of said narrow space area along the second axis and a maximum width of said outlet along the second axis, said mouth inner wall having a middle arcuate portion facing said wide space area, and two side arcuate portions each of which is connected between one end of said middle arcuate portion and a portion of said inner edge of said supporting wall, said two side arcuate portions being spaced apart from each other along the second axis, said middle arcuate portion having a curvature smaller than a curvature of each of said side arcuate portion.   
     
     
         2 . The lid as claimed in  claim 1 , wherein said connecting wall has a length along a third axis substantially perpendicular to the first axis and the second axis that is more than 90% of a length of said supporting wall along the third axis, said middle arcuate portion forming an angle with the first axis that ranges from 5 degrees to 15 degrees. 
     
     
         3 . The lid as claimed in  claim 1 , further comprising a sealing portion connected to said connecting wall and movable relative to said connecting wall between a closing position, in which said sealing portion closes said outlet and an open position, in which said sealing portion is distal to said outlet ( 221 ) to expose said outlet. 
     
     
         4 . The lid as claimed in  claim 3 , wherein said cover portion, said connecting portion, said sealing portion, and said mouth portion of said lid are integrally formed as one piece from pulp. 
     
     
         5 . The lid as claimed in  claim 3 , wherein said connecting wall of said cover portion further has a recess that is indented from an outer surface thereof, that is adjacent to said supporting wall and that is distal to said mouth portion of said lid along the third axis, said sealing portion being engaged with said recess when in said open position. 
     
     
         6 . The lid as claimed in  claim 1 , wherein said middle arcuate portion has a maximum width along the second axis that is greater than said width of said outlet but smaller than said maximum width of said wide space area. 
     
     
         7 . The lid as claimed in  claim 1 , wherein said mouth portion of said lid further includes a mouth outer wall spaced apart from said mouth inner wall, and an arcuate end wall connected between said mouth inner wall and said mouth outer wall and having a position difference with said supporting wall along the first axis. 
     
     
         8 . The lid as claimed in  claim 7 , wherein said mouth outer wall forms an angle with the first axis that ranges from 5 degrees to 15 degrees. 
     
     
         9 . The lid as claimed in  claim 6 , wherein said cover portion further includes a surrounding wall that extends downwardly from an outer edge of said supporting wall, that is connected to said connecting portion, and that is further connected to said mouth outer wall. 
     
     
         10 . The lid as claimed in  claim 9 , wherein said connecting portion includes an inner sidewall connected to a lower periphery of said surrounding wall, an outer sidewall surrounding and radially spaced apart from said inner sidewall, and an abutment end wall connected between said inner sidewall and said outer sidewall and having a position difference with said supporting wall along the first axis. 
     
     
         11 . The lid as claimed in  claim 10 , further comprising a stopping portion formed around an inner surface of said outer sidewall for contacting the container. 
     
     
         12 . The lid as claimed in  claim 11 , wherein said outer sidewall has an end edge, said stopping portion including a plurality of protruding ribs, each of said protruding ribs forming an angle with said end edge that ranges from 15 degrees to 45 degrees, and defining a gap with an adjacent one of said protruding ribs, each of said protruding ribs having a highest point and a lowest point along the first axis that cooperatively define therebetween a contact area for frictional contact with the container. 
     
     
         13 . The lid as claimed in  claim 11 , wherein said stopping portion includes a plurality of protruding ribs arranged in an array around said inner surface of said outer sidewall, each of said protruding ribs defining a gap with an adjacent one of said protruding ribs, said gaps between said adjacent ones of said protruding ribs defining a grid-like structure, said stopping portion having a highest point and a lowest point that cooperatively define therebetween a contact area for frictional contact with the container. 
     
     
         14 . The lid as claimed in  claim 11 , wherein said stopping portion includes a groove recessed from an outer surface of said outer sidewall and a protruding rib protruding from an inner surface of said outer sidewall and corresponding in position to said groove, said groove and said protruding rib being simultaneously formed by extrusion after said outer sidewall is formed, said protruding rib being configured to block the mouth portion of the container.