Pulsator for washing machine

Abstract

A pulsator for a washing machine includes a base; a rotating shaft positioned at a center of the base; a washing protrusion supported by the base, connected to the rotating shaft, and that protrudes upward; and a curved surface portion supported by the based, and having convex and concave curved surfaces in succession thereon.

1 . A pulsator for a washing machine, comprising:
 a base;   a rotating shaft positioned at a center of rotation of the base;   a washing protrusion supported by the base connected to the rotating shaft and protruding upward; and   a curved surface portion supported by the base, having convex and concave curved surfaces in succession thereon.   
     
     
         2 . The pulsator of  claim 1 , wherein the washing protrusion is on the curved surface portion. 
     
     
         3 . The pulsator of  claim 1 , wherein the base comprises:
 a base body having a circular ring shape surrounding the curved surface portion; and   a rib member connecting the base body and the rotating shaft and supporting the curved surface portion.   
     
     
         4 . The pulsator of  claim 3 , wherein the washing protrusion comprises:
 a first washing protrusion that protrudes in a spiral shape from the rotating shaft toward the base body; and   a second washing protrusion that is rotationally symmetrical with the first washing protrusion around the rotating shaft, and that protrudes in a spiral shape from the rotating shaft toward the base body.   
     
     
         5 . The pulsator of  claim 4 , wherein the first washing protrusion comprises:
 a first wing member connected to the rotating shaft and that protrudes upward;   a first concave side portion having a concave side surface at the first wing member; and   a first convex side portion having a convex side surface at the first wing member.   
     
     
         6 . The pulsator of  claim 5 , wherein the second washing protrusion comprises:
 a second wing member that is rotationally symmetrical with the first washing wing member around the rotating shaft, connected to the rotating shaft, and that protrudes upward;   a second concave side portion having a concave side surface fat the second wing member; and   a second convex side portion having a convex side surface at the second wing member.   
     
     
         7 . The pulsator of  claim 6 , wherein the curved surface portion comprises:
 a first rotation guide having one side in a concave curved shape and another side in a convex curved shape;   a first rising guide having one side connected to the first rotation guide and in a convex curved shape and another side in a concave curved shape;   a second rotation guide having one side connected to the first rising guide and in a concave curved shape and another side formed in a convex curved shape; and   a second rising guide having one side connected to the second rotation guide and in a convex curved shape and another side connected to the first rotation guide and in a concave curved shape.   
     
     
         8 . The pulsator of  claim 7 , wherein an inclined angle between the first rotation guide and the base body is equal to an inclined angle between the second rotation guide and the base body. 
     
     
         9 . The pulsator of  claim 8 , wherein an inclined angle between the first rising guide and the base body is equal to an inclined angle between the second rising guide and the base body. 
     
     
         10 . The pulsator of  claim 9 , wherein the inclined angle between the first rotation guide and the base body is smaller than the inclined angle between the first rising guide and the base body. 
     
     
         11 . The pulsator of  claim 7 , further comprising an auxiliary protrusion separate from the rotating shaft and on the curved surface. 
     
     
         12 . The pulsator of  claim 11 , wherein the auxiliary protrusion comprises:
 a first auxiliary wing at a connection between the first rotation guide and the second rising guide; and   a second auxiliary wing that is rotationally symmetrical with the first auxiliary wing around the rotating shaft, and at a connection between the second rotation guide and the first rising guide.   
     
     
         13 . The pulsator of  claim 12 , wherein each of the first and second auxiliary wings protrudes in a spiral shape from the rotating shaft toward the base body. 
     
     
         14 . The pulsator of  claim 11 , further comprising a guide protrusion on the curved surface portion, between the washing protrusion and the auxiliary protrusion, which protrudes in a spiral shape from the rotating shaft toward the base body.