Cup

Abstract

A cup including a main body is provided. The main body has a bottom, an outer side surface and an inner side surface. The outer side surface is smooth and arcuate. The inner side surface has plural protruding portions extending longitudinally and arranged on the inner side surface annularly. The inner side surface has plural concave portions extending longitudinally. Each of the concave portions is formed between two protruding portions. The inner side surface is arranged with at least one reinforcing rib integrally protruding thereon and extending radially. The reinforcing rib divides at least parts of the protruding and concave portions into two material-reduced areas. Whereby, the usage of material of the main body can be reduced, and the reinforcing rib provides excellent structural strength of the main body.

1 . A cup, including:
 a main body, including a bottom, an outer side surface and an inner side surface, the bottom and the inner side surface defining a receiving space, the outer side surface being smooth and arcuate, the inner side surface including plural protruding portions extending longitudinally, the protruding portions being arranged on the inner side surface annularly, and every two adjacent protruding portions defining a concave portion extending longitudinally therebetween;   wherein the inner side surface has at least one reinforcing rib integrally protruding therefrom and extending radially, and the reinforcing rib divides at least parts of the protruding portions and at least parts of the concave portions into two material-reduced areas;   wherein tops of the protruding portions and tops of the concave portions are connected to form an annular top portion, bottoms of the protruding portions and bottoms of the concave portions are connected to form an annular bottom portion, the diameter of the annular bottom portion is R, a distance from the annular bottom portion to the annular top portion is defined as H, the integer portion of the ratio of H/R is N, N represents the amount of the reinforcing rib(s), and N of the reinforcing rib(s) divides the protruding portions and the concave portions into N+1 of the material-reduced areas;   wherein the inner side surface is configured to have one of the reinforcing rib per interval D from the annular bottom portion, and the interval D follows the following condition: D−1≦H/(N+1)≦D+1;   wherein the cup is integrally made of plastic material in one piece, the cup is tapered from a top edge thereof to the bottom, and each reinforcing rib is entirely solid.   
     
     
         2 . The cup of  claim 1 , wherein the reinforcing rib integrally extends from and is annularly arranged on the inner side surface. 
     
     
         3 . The cup of  claim 1 , wherein the reinforcing rib includes a plurality of chunk members, and the chunk members are circumferentially and separately arranged on the inner side surface. 
     
     
         4 . The cup of  claim 2 , wherein the reinforcing rib and the main body are coaxial. 
     
     
         5 . The cup of  claim 3 , wherein the reinforcing rib and the main body are coaxial. 
     
     
         6 . (canceled) 
     
     
         7 . (canceled) 
     
     
         8 . The cup of  claim 1 , wherein the curvature of each concave portion is equal to that of the outer side surface. 
     
     
         9 . The cup of  claim 1 , wherein the main body includes a top edge, tops of the protruding portions and tops of the concave portions are connected to form an annular top portion, the inner side surface is formed with at least one annular arcuate surface, and the annular arcuate surface is disposed between the top edge and the annular top portion. 
     
     
         10 . The cup of  claim 1 , wherein bottoms of the protruding portions and bottoms of the concave portions are connected to form an annular bottom portion, the inner side surface is formed with at least one annular arcuate surface, and the annular arcuate surface is disposed between the bottom and the annular bottom portion. 
     
     
         11 . The cup of  claim 1 , wherein the thickness of the bottom of the main body is greater than distances between the respective vertices of the protruding portions and the outer side surface. 
     
     
         12 . The cup of  claim 1 , wherein viewed in a longitudinal cross-section an inner surface of each reinforcing rib is shaped in a single convex inwardly and smoothly connected with the inner side surface of the main body without transition point. 
     
     
         13 . The cup of  claim 1 , wherein the inner side surface is formed with a smooth annular arcuate surface extending upwardly from the bottom of the main body.