Washing machine

Abstract

A washing machine including a drum capable of improving washing efficiency is provided. The washing machine includes a body, a tub provided at an inside the body to store wash water, a drum rotatably provided at an inner side of the tub to accommodate laundry, a driving apparatus to rotate the drum, protrusions that are formed of polygons having polygonal shapes and protruding inward from the drum, and a through-hole provided between adjacent protrusions to drain water. A protrusion having polygons generates frictional force between laundry and the drum, thereby increasing the washing power. The through-holes are uniformly located around the protrusion, thereby preventing a spin dry water bottleneck phenomenon that occurs when water from a spin dry is concentrated on a certain through-hole, and thus enhancing the spin dry efficiency.

What is claimed is: 
     
         1 . A washing machine comprising:
 a body;   a tub provided at an inside of the body to store wash water therein;   a drum rotatably provided at an inner side of the tub to accommodate laundry therein;   a driving apparatus to rotate the drum;   a plurality of protrusions protruding inward from the drum, wherein a protrusion of the plurality of protrusions being formed by a plurality of polygons each having polygonal shapes; and   at least one through-hole provided between adjacent protrusions among the plurality of protrusions to drain water.   
     
     
         2 . The washing machine of  claim 1 , wherein the protrusions are spaced apart from one another. 
     
     
         3 . The washing machine of  claim 1 , wherein each of the polygons has a different angle with respect to a surface of the drum. 
     
     
         4 . The washing machine of  claim 3 , wherein the polygon is a triangle. 
     
     
         5 . The washing machine of  claim 4 , wherein the plurality of triangles gather at a center of the protrusion, to form a hexagonal shape. 
     
     
         6 . The washing machine of  claim 1 , wherein an outline of the protrusion is provided in a curved line such that the protrusion has an approximately circular shape. 
     
     
         7 . The washing machine of  claim 1 , wherein the plurality of through-holes are formed at depressions that are provided more outward from the drum than the protrusion. 
     
     
         8 . The washing machine of  claim 7 , wherein the depression is provided to be substantially flat. 
     
     
         9 . The washing machine of  claim 7 , wherein the depression includes a concave part formed by recessing at least one portion of the depression. 
     
     
         10 . The washing machine of  claim 1 , wherein an arrangement of the through-holes provided around the protrusion has an approximately hexagonal shape. 
     
     
         11 . The washing machine of  claim 2 , wherein the plurality of protrusions are provided in a plurality of rows and columns. 
     
     
         12 . A washing machine comprising:
 a body;   a tub provided at an inside of the body to store wash water;   a drum rotatably provided at an inner side of the tub to accommodate laundry therein;   a driving apparatus to rotate the drum;   a plurality of protrusions protruding from the drum toward one side, wherein a protrusion of the plurality of protrusions being formed by a plurality of polygons each provided on a different plane; and   through-holes provided at an outermost area of the drum while being provided on a same plane.   
     
     
         13 . The washing machine of  claim 12 , wherein each of the plurality of protrusions has a predetermined pattern. 
     
     
         14 . The washing machine of  claim 13 , wherein the plurality of protrusions are provided in a first row and a second row such that a protrusion forming the first row is disposed between protrusions forming the second row. 
     
     
         15 . The washing machine of  claim 12 , wherein each of the plurality of through-holes is provided between the protrusions. 
     
     
         16 . The washing machine of  claim 15 , wherein when assuming that the through-hole has a diameter of d, a closest distance between the protrusions is between d and d+10. 
     
     
         17 . The washing machine of  claim 12 , wherein each of the plurality of polygons is a triangle having three sides, the plurality of triangles gather to form a hexagonal, and triangles are disposed at a circumference of the hexagonal to form a single protrusion of the plurality of protrusions. 
     
     
         18 . The washing machine of  claim 12 , wherein a portion between the polygons is rounded. 
     
     
         19 . A drum for a washing machine comprising:
 a plurality of protrusions protruding inward from the drum, wherein a protrusion is formed of a plurality of polygons having polygonal shapes; and   a through-hole provided between protrusions to drain water.