Patent Publication Number: US-2005138841-A1

Title: Sole structure of working shoe

Description:
BACKGROUND OF THE INVENTION  
      1. Field of the Invention  
      The present invention relates to a sole structure of working shoe, and more particularly to a sole that is stitched to an upper by a stitching along the contour of the sole with uniform stitching thickness in order to increase the strength of the sole structure.  
      2. Description of Related Art  
      A conventional working shoe is designed for some dangerous working environments, like a welding plant, a high temperature environment, and a slippery condition.  
      Referring to  FIG. 1 , a conventional working shoe has an upper  11 , a middle sole  12 , a lower sole  13 , and a heel  14 . The upper  11  is stitched to the middle sole  12  by a stitching  15 . The lower sole  13  gums to the middle sole  12 , and at last the heel  14  gums to the lower sole  13 . However, in some special environments, the working shoes have to provide waterproof, heatproof, greaseproof, and skidproof functions, but the binding method of conventional arts of working shoes has problems because the gum, bonding each layer of the sole, would be melted under the hot condition. Besides, in the other method of one conventional art that the lower sole  13  is stitched to the middle sole  12  by a stitching  15 , the stitching  15  is directly stitched along the contour of the lower sole  13  and is not covered so that the stitching  15  would be worn more often during the working in dangerous environments and it would lead to diminish the utility of the working shoes.  
      Taiwan Patent Application No. 89207471, which is filed by the present inventor, discloses a sole structure of working shoe. Referring to  FIG. 2 , the sole structure of working shoe has an upper  31  stitched to the periphery of a sole  32  by a stitching  35 . The sole  32  has a heel  33 , according to the heel, and a front portion  34 , according to the toes, which are extended from the surface of the sole  32 . Each overall size of the heel  33  and the front portion  34  is smaller than the overall size of the sole  32 , and therefore the stitching  35  would be stitched along the edge of the sole  32 .  
      To overcome the shortcomings, the present invention tends to provide a sole structure of working shoe to mitigate the aforementioned problems.  
      In order to alleviate the aforementioned problems of the conventional arts, a sole structure of working shoe is designed meticulously. On the basis of inventor&#39;s practice according to the work, the present invention is useful, and it can solve the problems and limits of the conventional arts.  
      To attain the above-stated object, in a sole structure of working shoe having an upper which is stitched to the periphery of the sole by a stitching, and the characteristic is that a gadroon forms along the outer periphery of a part of the sole where the heel portion extended. The result is that the gadroon has a quite depth for stitching so that the stitching stitches the sole under the upper along the contour of the sole with uniform stitching thickness.  
      About a preferred embodiment of the present invention, the sole structure of working shoe having an upper which is stitched to the periphery of the sole by a stitching, and the characteristic is that a gadroon forms along the outer periphery of a part of the sole where the heel portion extended and a front portion according to the toes and extended from the surface of the sole has an overall size which is smaller than the sole. The result is that the gadroon has a quite depth for stitching and the stitching would be stitched along the contour of the sole with uniform stitching thickness.  
      The present invention has improvements described as follows. First, the whole sole is bonded with the upper by a stitching, and therefore it would never have problems about the gum. Moreover, the stitching would not contact the ground directly and be protected from wear. Finally, the present invention not only improves the strength of the bond and prevents the damage of the wear but also makes the users more comfortable. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
      In order to more fully explain the features and advantages of the present invention, the following preferred embodiments of a shoe according to the invention are described, as examples only without any limitative character, with reference to the accompanying drawings, in which:  
       FIG. 1  is a perspective view of a conventional sole structure of working shoe;  
       FIG. 2  is a plan view of another conventional sole structure of working shoe;  
       FIG. 3  is a perspective view of a preferred embodiment of the sole structure of working shoe of the present invention;  
       FIG. 4  is a sectional view according to the heel of the shoe of  FIG. 3 ;  
       FIG. 5  is a perspective view of another preferred embodiment of the sole structure of working shoe of the present invention;  
       FIG. 6  is a front view of the shoe of  FIG. 5 . 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT  
      Referring to  FIG. 3 , a sole structure of working shoe in accordance with the present invention has an upper  1  that is stitched to the periphery of the sole  2  by a stitching  22   f.    
      The sole  2  has a lower sole  22 , constructed by a front portion  22   a , a shank  23 , and a heel portion  22   b . The front portion  22   a , according to the toes, and the heel portion  22   b , according to the heel, are extended from the surface of the sole  2 . The shank  23  is hung in the air because the heel portion  22   b  is thicker than the front portion  22   a . Referring to  FIG. 4 , a gadroon  22   c  forms along the outer periphery of a part of the sole  2  where the heel portion  22   b  extended, and the gadroon  22   c  has a quite depth for stitching so that the stitching  22   f  stitches the sole  2  under the upper  1  along the contour of the sole  2  with uniform stitching thickness.  
      Referring to  FIGS. 5 and 6 , the sole structure of working shoe in accordance with the present invention wherein the gadroon  22   c  is filled up with a welt  22   g . The welt  22   g  is a decoration and makes the shoes fancy. Furthermore, the welt  22   g  can prevent the gadroon  22   c  dirty and protect the stitching  22   f  from wear. Finally, the welt  22   g  can reflect light in the dark to improve the safety of the users.  
      Referring to  FIG. 7 , the sole structure of working shoe in accordance with the present invention wherein the front portion  22   a  forms an annular portion  22   d  surrounding an inner portion  22   e . The annular portion  22   d  is the surrounding part of the front portion  22   a , and the inner portion  22   e  is the other part, the inner part, of the front portion  22   a . The inner portion  22   e  is thicker than the annular portion  22   d  so that the stitching  22   f  stitches the sole  2  under the upper  1  along the contour of the sole  2  with uniform stitching thickness.  
      About the said sole structure of working shoe of the present invention, the upper  1  is stitched to the sole  2  along the contour of the sole  2  by the stitching  22   f  with uniform stitching thickness so that the combinative strength of the upper  1  and the sole  2  is stronger and do not be degummed.  
      It is to be understood, however, that even though numerous characteristics and advantages of the present invention have been set forth in the foregoing description, together with details of the structure and function of the invention, the disclosure is illustrative only, and changes may be made in detail, especially in matters of shape, size, and arrangement of parts within the principles of the invention to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.