Hair roller

Abstract

A hair roller for wrapping therearound a hair portion is a concave cylinder, which has a normally cross section at a top portion and a bottom portion thereof larger than a normally cross section at a middle portion thereof an oval cylinder; an oval cylinder, which has at least one normally oval cross-section; or a concave oval cylinder. The hair roller is optionally provided with a hair-retaining structure formed on the roller body for grabbing the hair portion.

What is claimed is: 
     
         1 . A hair roller, comprising a roller body for wrapping therearound a hair portion, wherein the roller body is cylindrical in shape and has a normally oval cross-section. 
     
     
         2 . The hair roller according to  claim 1 , further comprising a hair-retaining structure formed on the roller body for grabbing the hair portion and/or confining a movement range of the hair portion on the roller body. 
     
     
         3 . The hair roller according to  claim 2 , wherein the hair-retaining structure includes bristles, a piece of hooks and/or loops attached onto the roller body, grooves provided on the roller body for receiving therein the hair portion, or a combination thereof. 
     
     
         4 . The hair roller according to  claim 3 , wherein the hair-retaining structure is implemented with a concave middle portion of the roller body. 
     
     
         5 . The hair roller according to  claim 2 , wherein the hair-retaining structure includes a recess formed on a conferential surface of the roller body for receiving and confining the hair portion. 
     
     
         6 . The hair roller according to  claim 1 , wherein the roller body is a hollow oval cylinder. 
     
     
         7 . The hair roller according to  claim 6 , further comprising a cushion material formed inside the hollow oval cylinder. 
     
     
         8 . The hair roller according to  claim 6 , further comprising a heat-conductive material formed inside the hollow oval cylinder. 
     
     
         9 . The hair roller according to  claim 6 , further comprising a cushion material formed inside the hollow oval cylinder, and a heat-conductive material formed between the cushion material and the oval cylinder. 
     
     
         10 . The hair roller according to  claim 1 , wherein the roller body is a solid oval cylinder. 
     
     
         11 . The hair roller according to  claim 10 , further comprising a plurality of channels distributed in the solid oval cylinder for inserting or filling therein a heater material, which can spontaneously dissipate heat and/or be heated after being placed in the channels. 
     
     
         12 . The hair roller according to  claim 10 , further comprising a plurality of thermos-cells embedded in the solid oval cylinder and adapted to be repetitively heated by a heating source. 
     
     
         13 . A hair roller, comprising a roller body for wrapping therearound a hair portion, wherein the roller body is a concave cylinder, which has a normally cross section at a top portion and a bottom portion thereof larger than a normally cross section at a middle portion thereof. 
     
     
         14 . The hair roller according to  claim 13 , wherein the hair roller is cylindrical in shape and has normally oval cross sections of different area. 
     
     
         15 . The hair roller according to  claim 13 , further comprising a hair-retaining structure formed on the roller body for grabbing the hair portion and/or confining a movement range of the hair portion on the roller body. 
     
     
         16 . The hair roller according to  claim 15 , wherein the hair-retaining structure includes bristles, a piece of hooks and/or loops attached onto the roller body, grooves provided on the roller body for receiving therein the hair portion, or a combination thereof. 
     
     
         17 . The hair roller according to  claim 13 , wherein the roller body is a hollow cylinder. 
     
     
         18 . The hair roller according to  claim 17 , further comprising a cushion material and/or a heat-conductive material formed inside the hollow cylinder. 
     
     
         19 . The hair roller according to  claim 13 , wherein the roller body is a solid oval cylinder. 
     
     
         20 . The hair roller according to  claim 19 , further comprising a plurality of channels distributed in the solid oval cylinder for inserting or filling therein a heater material, which can spontaneously dissipate heat and/or be heated after being placed in the channels. 
     
     
         21 . The hair roller according to  claim 19 , further comprising a plurality of thermos-cells embedded in the solid oval cylinder and adapted to be repetitively heated by a heating source. 
     
     
         22 . A hair roller, comprising:
 a roller body for wrapping therearound a hair portion, wherein the roller body is a concave oval cylinder, which has a normally oval cross section at a top portion and a bottom portion thereof larger than a normally oval cross section at a middle portion thereof; and   a hair-retaining structure formed on the roller body for grabbing the hair portion.