Abstract:
This invention relates to a kind of electric iron for eliminating wrinkles from clothes and other materials. The electric iron has an ironing seat, which is composed of a soleplate, an ironing surface on the soleplate, and a heater that heats the soleplate. There are heater-shaped dented portions on the ironing surface where the heater is installed. This invention, with this structure, reduces a contacting area between the ironing surface close to the heater and clothes or other materials to be ironed, thus changing an uneven distribution of temperature on the ironing surface. Further, for a steam electric iron, steam sprayed out of steam outlets in a soleplate spreads to areas away from a heater through dented portions, thereby resulting in an effect of wrinkle elimination.

Description:
TECHNICAL FIELD 
   The present invention relates to a kind of electric iron for eliminating wrinkles from clothes and other materials. 
   BACKGROUND OF THE INVENTION 
   For an ironing seat of existing electric irons, a heating temperature in an area close to a heater on an ironing surface attached to a soleplate is higher than areas away from the heater, due to structure of the soleplate and a shape of the heater. As a result, the heating temperature on the ironing surface in its entirety is not even. For these existing steam electric irons, steam flow is also irregular. Thus, it is hard to achieve an excellent ironing effect with the existing electric irons. 
   SUMMARY OF THE INVENTION 
   A purpose of this invention is to resolve the above-mentioned problems and provide a kind of electric iron that is free from shortcomings of the existing electric irons. 
   The following is a technical aspect of this invention: an electric iron has an ironing seat, which is composed of a soleplate, ironing surface on the soleplate, and heater that heats the soleplate; there are dented portions on the ironing surface of the soleplate where the heater is installed, and the dented portions are distributed according to a shape of the heater. 
   The dented portions are radially distributed from a center line of a heater&#39;s projection on the ironing surface to one side or both sides of the center line. In response to a direction of this radial distribution, a caliber of the dented portions changes from big to small, or their depth changes from big to small, or both of these features are incorporated. 
   A purpose of the dented portions is to reduce a contacting area between the ironing surface close to the heater and clothes or other materials to be ironed, and then reduce an uneven distribution of temperature on the ironing surface, and guide steam that a steam electric iron sprays, thereby resulting in an excellent effect of wrinkle elimination. Therefore, each dented portion may have no less than one pit or groove, or a combination of a pit and groove. 
   This invention, with this structure, reduces the contacting area between the ironing surface close to the heater and the clothes or other materials to be ironed, thus effectively changing an uneven distribution of temperature on the ironing surface. Further, for a steam electric iron, steam sprayed out of steam outlets in the soleplate spreads to areas away from the heater through the dented portions, resulting in an excellent effect of wrinkle elimination. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
       FIG. 1  shows a cutaway view of an ironing seat of an electric iron in Embodiment 1 of this invention; 
       FIG. 2  shows a planform of the ironing seat of the electric iron in Embodiment 1 of this invention; 
       FIG. 3  shows a bottom view of the ironing seat of the electric iron in Embodiment 1 of this invention; 
       FIG. 4  shows an A-A cutaway view of  FIG. 3 ; 
       FIG. 5  shows a bottom view of an ironing seat of an electric iron in Embodiment 2 of this invention; 
       FIG. 6  shows a B-B cutaway view of  FIG. 5 ; 
       FIG. 7  shows a bottom view of an ironing seat of an electric iron in Embodiment 3 of this invention; 
       FIG. 8  shows a C-C cutaway view of  FIG. 7 ; 
       FIG. 9  shows a bottom view of an ironing seat of an electric iron in Embodiment 4 of this invention; 
       FIG. 10  shows a D-D cutaway view of  FIG. 9 ; 
       FIG. 11  shows a bottom view of an ironing seat of an electric iron in Embodiment 5 of this invention; 
       FIG. 12  shows an E-E cutaway view of  FIG. 11 ; 
       FIG. 13  shows a bottom view of an ironing seat of an electric iron in Embodiment 6 of this invention; 
       FIG. 14  shows an F-F cutaway view of  FIG. 13 ; 
       FIG. 15  shows a bottom view of an ironing seat of an electric iron in Embodiment 7 of this invention; 
       FIG. 16  shows a G-G cutaway view of  FIG. 15 ; 
       FIG. 17  shows a bottom view of an ironing seat of an electric iron in Embodiment 8 of this invention; 
       FIG. 18  shows an H-H cutaway view of  FIG. 17 ; 
       FIG. 19  shows a bottom view of an ironing seat of an electric iron in Embodiment 9 of this invention; 
       FIG. 20  shows an I-I cutaway view of  FIG. 19 ; 
       FIG. 21  shows a bottom view of an ironing seat of an electric iron in Embodiment 10 of this invention; and 
       FIG. 22  shows a J-J cutaway view of  FIG. 21 . 
   

   DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
   Below are further explanations of this invention with the attached drawings and embodiments. 
   Embodiment 1 
   As  FIGS. 1-4  show, an ironing seat  1  of this invention is composed of a soleplate  3 , which is heated by heater  2 , and a cover  4 , which covers the soleplate  3 . The heater  2  is embedded in aluminum soleplate  3  with outstanding heat conductivity when it is molded. A surface of soleplate  3  is a curved face, which forms an ironing surface  5  after polishing and treatment with a fluoresin coating. In the ironing surface  5 , there are multiple steam outlets  6  and multiple dented portions along embedded heater  2 , with the steam outlets  6  and dented portions being arranged in an arrangement similar to a shape of the heater  2 . Each dented portion is composed of a group of pits, which includes three pits  7 . Each group of pits is aligned with a steam outlet  6 , and are radially distributed from a center line of a heater&#39;s projection on the ironing surface to inside of the center line, namely, a central area of the ironing surface. Meanwhile, a caliber and depth of the pits change from big to small (W 1 &gt;W 2 &gt;W 3 ). The caliber of the pit on a center of the heater&#39;s projection has a largest caliber and depth. There is no pit in a center and rear end of the ironing surface along a predetermined length in a longitudinal direction of the electric iron. Also, a rear end part has a dent-free area where there is no pit across a full width of the ironing surface. 
   In one example, dimensions of W 1 , W 2  and W 3  are 4.5 mm, 3.5 mm and 2.5 mm, respectively; each dented portion is arranged with a pitch of 6 mm; and a distance between the center line of the heater&#39;s projection on the ironing surface and a smallest pit is 12 mm. 
   A steam chamber  8  on the soleplate evaporates water from a water tank (not shown in the drawings) above the ironing seat  1  and produces steam. The steam chamber  8  is covered with cover  4 , and the steam that the steam chamber  8  produces sprays out of a steam outlet. Since the ironing surface  5  is a curved face, there is a gap between the ironing surface and a cloth to be ironed. Thus, after being sprayed from steam outlet  6 , the steam can enter the dented portions easily and will spread to a central area of the ironing surface along the dented portions (each group of pits). When the steam enters the pits, the ironing surface  5  can move smoothly. When the heater  2  is electrified, it heats and a temperature of the ironing surface rises. The pits reduce a contacting surface between the ironing surface close to the heater and clothes to be ironed. There is not any pit in the central area and the rear end of the ironing surface, which is away from the heater. As mentioned above, a volume and an inner-surface area of a part near the heater  2  of the dented portion in which air and steam having a lower temperature than that of the ironing surface  5  can be accumulated is enlarged, or a projection area on the ironing surface  5  of the part near the heater  2  of the dented portion is enlarged. Thus, a temperature of the ironing surface in its entirety is roughly even. By providing the dented portions, steam which escapes out of the ironing surface  5  immediately, if there are no dented portions on the ironing surface, can be held within the dented portions. Therefore, portions of a cloth corresponding to the dented portions are fully swelled, and the dented portions can enhance an effect of wrinkle elimination. Further since the dented portions do not exist at the central part and the rear end of the ironing surface  5 , the central part and the rear end can press the cloth strongly. Thus, the cloth can fully be dried and finished without wrinkle. At this time, since there are a plurality of rows of the dented portions and they are formed from big to small as mentioned above, an amount of steam held in the dented portions can be decreased gradually. Also, since there are no dented portions at the rear end part, which applies finishing touches to the cloth during ironing, of the ironing surface  5 , the rear end part contributes to making the cloth fully dry and finishing the cloth smoothly. As a result, smoothness of the ironing surface and an effect of wrinkle elimination can be improved. 
   Embodiment 2 
     FIG. 5  and  FIG. 6  show an ironing seat of a dry electric iron. Heater  2  is buried in soleplate  3 , whose surface forms ironing surface  5 . There are multiple dented portions on the ironing surface  5  where the heater is embedded, and each dented portion is composed of a group of pits, which includes four pits  7 . Each group of pits is radially distributed from a center line of a heater&#39;s projection on the ironing surface to both sides of the center line of the heater&#39;s projection. Meanwhile, a caliber and depth of the pits change from big to small (W 1 &gt;W 2 &gt;W 3 ). The caliber of the pit in the heater&#39;s projection center has a largest caliber and depth. There is no pit in a center and rear end of the ironing surface along a predetermined length in a longitudinal direction of the electric iron. Also, the rear end part has a dent-free area where there is no pit across a full width of the ironing surface. 
   Other effects of this embodiment are similar to those of Embodiment 1. 
   Embodiment 3 
   As  FIG. 7  and  FIG. 8  show, heater  2  is buried in soleplate  3 , whose surface forms ironing surface  5 . Soleplate  3  is covered with cover  4 . There are multiple steam outlets  6  and multiple dented portions on the ironing surface  5  where the heater is embedded, and each dented portion is a groove  9 . Each groove  9  is aligned with a steam outlet  6 , and extends radially from a center line of a heater&#39;s projection on the ironing surface to inside of the heater&#39;s projection center line, namely, a central area of the ironing surface. A caliber and depth of the grooves change from big to small (W 1 &gt;W 2 ). Other structures of this embodiment are similar to those of Embodiment 1. 
   Each groove  9  reduces a contacting area between the ironing surface and clothes to be ironed, and spreads steam to a center of the ironing surface. Flow of steam in the groove enables the ironing surface to move smoothly, to achieve the effects of Embodiment 1. 
   Embodiment 4 
     FIG. 9  and  FIG. 10  show an ironing seat of a dry electric iron. Different from Embodiment 3, this ironing seat doesn&#39;t have a steam chamber cap (cover), steam chamber or steam outlet. On ironing surface  5  on soleplate  3  where a heater is embedded, there are multiple grooves  9 . Each groove  9  extends radially from a center line of a heater&#39;s projection on the ironing surface to inside of the center line of the heater&#39;s projection, namely, a central area of the ironing surface. A caliber and depth of the grooves change from big to small. There are pits  7  corresponding to grooves  9 , respectively. Compared with the grooves  9  in a center of the heater&#39;s projection, pits  7  have a smaller mouth width and depth. Other structures of this embodiment are similar to those of Embodiment 2. 
   Effects of this embodiment are similar to those of Embodiment 2. 
   Embodiment 5 
     FIG. 11  and  FIG. 12  show an ironing seat of a dry electric iron. Different from Embodiment 4, there are not any pits outside a center line of a heater&#39;s projection on an ironing surface. Other structures are similar to those of Embodiment 4. 
   Effects of this embodiment are similar to those of Embodiment 4. 
   Embodiment 6 
   As  FIGS. 13 and 14  show, heater  2  is buried in a central part of soleplate  3 . There are multiple steam outlets  6  and multiple dented portions on ironing surface  5  where the heater is embedded, and each dented portion is composed of a group of pits, which includes three pits  7 . Each group of pits is aligned with a steam outlet  6 , and extends radially from a center line of a heater&#39;s projection on the ironing surface to outside of the center line, namely, a marginal area of the ironing surface. A caliber and depth of the pits change from big to small (W 1 &gt;W 2 &gt;W 3 ). The caliber of the pit in a center of the heater&#39;s projection has a largest caliber and depth. Other structures of this embodiment are similar to those of Embodiment 1. 
   The steam outlets and pits close to the heater on the ironing surface reduce a contacting area between a high-temperature ironing surface and clothes to be ironed. Further, steam spreads outwards from the pits, thereby enabling the ironing surface to move smoothly, thus achieving the same effects as those of Embodiment 1. 
   Embodiment 7 
     FIG. 15  and  FIG. 16  show an ironing seat of a dry electric iron. Heater  2  is buried in a central part of soleplate  3 , whose surface forms ironing surface  5 . There are multiple dented portions on the ironing surface  5  where the heater is embedded, and each dented portion is composed of a group of pits, which include four pits  7 . Each group of pits is radially distributed from a center line of a heater&#39;s projection on the ironing surface to both sides of the center line. Meanwhile, a caliber and depth of the pits change from big to small (W 1 &gt;W 2 &gt;W 3 ). The caliber of the pit in a center of the heater&#39;s projection has a largest caliber and depth. 
   Effects of this embodiment are similar to those of Embodiment 1. 
   Embodiment 8 
   As  FIG. 17  and  FIG. 18  show, heater  2  is buried in a central part of soleplate  3 , whose surface forms ironing surface  5 . There are multiple steam outlets  6  and multiple grooves  9  on the ironing surface  5  where the heater is embedded, and each groove  9  is aligned with a steam outlet  6 , and extends radially from a center line of a heater&#39;s projection on the ironing surface to outside of the center line, namely, a marginal area of the ironing surface. A caliber and depth of the grooves change from big to small. Other structures of this embodiment are similar to those of Embodiment 6. 
   The grooves, close to the heater, on the ironing surface reduce a contacting area between a high-temperature ironing surface and clothes to be ironed. Further, the grooves enable steam to spread outwards, thereby allowing the ironing surface to move smoothly, thus achieving the same effects as those of Embodiment 1. 
   Embodiment 9 
     FIG. 19  and  FIG. 20  show an ironing seat of a dry electric iron. Heater  2  is buried in a central part of soleplate  3 , whose surface forms ironing surface  5 . There are multiple grooves  9  on the ironing surface  5  where the heater is embedded, and each groove  9  extends radially from a center line of a heater&#39;s projection on the ironing surface to outside of the center line, namely, a marginal area of the ironing surface. A caliber and depth of the grooves change from big to small. Inside the center line of the heater&#39;s projection, there is a pit  7  corresponding to groove  9 . Compared with the grooves  9  in a central part, pits  7  have a smaller mouth width and depth. 
   Effects of this embodiment are similar to those of Embodiment 1. 
   Embodiment 10 
     FIG. 21  and  FIG. 22  show an ironing seat of a dry electric iron. Different from Embodiment 9, there is not any pit inside a center line of a projection of a heater on an ironing surface. Other structure is the same as that of Embodiment 9. 
   It is to be noted that, by properly combining arbitrary embodiments of the aforementioned various embodiments, effects possessed thereby can be produced. 
   Although the present invention has been fully described in connection with preferred embodiments thereof with reference to the accompanying drawings, it is to be noted that various changes and modifications are apparent to those skilled in the art. Such changes and modifications are to be understood as included within the scope of the present invention as defined by the appended claims unless they depart therefrom. 
   The disclosure of Chinese Patent Application No. 200410077466.8 filed on Dec. 20, 2004, including specification, claims, drawings, and summary is incorporated herein by reference in its entirety.