Abstract:
A water pipe wrench structure consisting of a first wrench body and a second wrench body pin jointed by a control component. The first wrench body includes an actuating piece. A tooth space is positioned on this actuating piece. This actuating piece and a tooth piece extend with a uniform curvature. The second wrench body includes a perforation to pass the control component through this perforation and the tooth space. This control component includes a column piece and a grinding tooth piece, and the grinding tooth piece can be moved by pressure, so that the grinding tooth piece can be engaged to or separated from the tooth space and thus end the movement of the control component.

Description:
BACKGROUND OF THE INVENTION 
       [0001]    1. Field of the Invention 
         [0002]    The present invention relates to water pipe wrench structures, particularly to a water pipe wrench with adjustable clamping diameter. 
         [0003]    2. Description of the Related Art 
         [0004]    Conventional water pipe wrenches, such as the ones shown in  FIGS. 10 and 11  are formed of two wrench bodies  4 ,  5  hinged at an intersection point. Among these, a long straight tooth space  41  is found on one of the wrench bodies  4 , and the other wrench body  5  is positioned in said tooth space  41  via a pivot  51  comprising ratchets  52 ; wherein said pivot  51  can be controlled so as to be separated from said tooth space  41 , so that the wrench body  5  can make a sliding movement relative to the opposite wrench body  4 , and in this way adjust the clamping diameter of the water pipe wrench. Afterwards, said pivot  51  can again be controlled to engage the ratchet  52  into the tooth space  41 , so that the position of said pivot  51  would be fixed, and the clamping diameter for picking up objects would be set. 
         [0005]    When the above said wrench body  5  is to be opened up, it can block the side face  42  of the wrench body  4  by means of a blocking piece  53  in order to provide the largest opening up width. However, the side face  42  of the wrench body  4  also corresponds to the shape of said tooth space  41  and forms a long straight shape, and this structural shape reduces the opening up width of the wrench body  5  during the opening up motion, which leads to inconvenience during use. 
         [0006]    On the other hand, as shown in  FIG. 11 , a row of teeth structure  43  is found individually on both sides of said tooth space  41 . Therefore, said teeth structure  43  has an upright appearance from top to bottom, which necessitates the user to completely separate said tooth space  41  using said pivot  51  and only after that he/she can adjust the position of the pivot  51  on the tooth space  41 , which also forms another inconvenient drawback in usage. 
       SUMMARY OF THE INVENTION 
       [0007]    The main purpose of the present invention is to provide a water pipe wrench structure, which comprises a wrench body having a tooth space and a side edge that has a curved shape so as to enable another wrench body to open up with a larger width, and thus enhance the operability and convenience during use. 
         [0008]    In order to achieve this purpose, the present invention provides a water pipe wrench structure, comprising: 
         [0009]    a first wrench body, which comprises a first clamping piece and a first handle piece at its two ends, respectively, and an actuating piece is positioned between said first clamping piece and said first handle piece, and a penetrating tooth space is found on said actuating piece, and said tooth space comprises a plurality of teeth separately on the left and right sides; wherein the distance between the teeth found at the two sides of said tooth space is defined by the width of the tooth space, and said tooth space has a curved shape facing towards said first handle piece, and the side edge of said actuating piece also has a curved shape corresponding to curved the shape of said tooth space; 
         [0010]    a second wrench body, which comprises a second clamping piece and a second handle piece at its two ends, respectively, and a perforation with a stepped surface is positioned between said second clamping piece and said second handle piece; wherein said second wrench body and its perforation directly face the tooth space of said first wrench body and also intersect with said first wrench body on top of each other; a blocking piece is positioned near said second clamping piece of said second wrench body, and thus, when said second wrench body is opened with regard to said first wrench body, said blocking piece is blocked by the side face of the actuating piece of said first wrench body, so that the opening up width of said second wrench body would be restricted; 
         [0011]    a control component, which comprises a column piece with a smaller outer diameter than the width of said tooth space, and a pressing piece is found at the top of said column piece, and the bottom part is encircled within a grinding tooth piece and a base plate; the column piece of said control component is passed through said perforation and said tooth space, and said pressing piece is positioned on top of said stepped surface; the position of said grinding tooth piece can be changed by pressing on said pressing piece and as a result, it engages with or breaks away from the teeth of said tooth space. 
         [0012]    Among these, a flexible component is positioned around the column piece of said control component, and the two ends of said flexible component are pushed against said pressing piece and said stepped surface, respectively. 
         [0013]    Moreover, the invention also comprises a bridge joint component, wherein said bridge joint component and said second wrench body are separately positioned at the lower and upper sides of the tooth space of said first wrench body, and said bridge joint component and said second wrench body are solid jointed, and the base plate of said control component is passed through said bridge joint component. Also, two connection blocks are positioned on said second wrench body in the form of protrusions, and these two connection blocks are individually placed at the two sides of the actuating piece of said first wrench body, and thus the two ends of said bridge joint component are separately fixed on these two connection blocks. 
         [0014]    In one embodiment, one side among the upper and lower sides of the teeth found on said tooth space extend towards each other and cause the width of said tooth space to take a form that is narrower at the upper part while wider at the lower part, or that is wider at the upper part while narrower at the lower part, and the grinding tooth piece of said control component also corresponds to the shape and width of said tooth space. 
         [0015]    In another embodiment, the forging flow line of said first wrench body extends along the extension direction of said first wrench body, and the forging flow line of said second wrench body extends along the extension direction of said second wrench body. 
         [0016]    The characteristics of the present invention are as follows: 
         [0017]    1. First, the two wrench bodies can be manufactured with the path of forging flow line towards the direction of holding, and using the bridge joint component, the first and the second wrench bodies can be intersected and pin jointed at one point, and a hole with a passage to the first wrench body is not required to be opened on the second wrench body; and therefore, the first and second wrench bodies can have relatively higher structural strength, and also the first and second wrench bodies can be readily connected via the bridge joint component during assembly, which would make the assembly operation more convenient and quicker. 
         [0018]    2. The two ends of said flexible component can have shapes with different sectional areas, for instance a conical shape, which would enable better mounting of the flexible component on the stepped surface, or in other words, when the stepped surface part is narrowed down, said conical flexible component can appropriately be fitted and mounted on the stepped surface, which accordingly improves the convenience in assembly. 
         [0019]    3. Said angle restriction body (grinding tooth piece, base plate) is manufactured by forging/metal injection, and the forging/metal injection method enables the metal to take the desired shape effectively while retaining the strength of the metal, as well as changing or adjusting the direction of metal flow line has more consistency, and also retains the clamping strength and durability of the grinding tooth piece. 
         [0020]    The purposes and advantages of the above disclosed present invention can be understood better with the below given detailed description of the preferred embodiments and attached figures. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0021]      FIG. 1  is a three dimensional drawing of the present invention; 
           [0022]      FIG. 2  is an exploded three dimensional drawing of the present invention; 
           [0023]      FIG. 3  is a partial exploded three dimensional drawing of the present invention from another angle; 
           [0024]      FIGS. 4 and 5  are plan view drawings of the present invention, showing its forging flow line; 
           [0025]      FIG. 6  is a drawing that shows the usage view during opening up of the present invention; 
           [0026]      FIGS. 7 and 8  are section view drawings of the present invention&#39;s control component during use; 
           [0027]      FIG. 9  is a drawing of another embodiment of the present invention&#39;s flexible component; 
           [0028]      FIG. 10  is a plan view drawing of the prior art structure; 
           [0029]      FIG. 11  is a section view drawing of the prior art structure during use. 
       
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
       [0030]    In  FIGS. 1 to 3 , the water pipe wrench structure of the present invention is shown, which mainly comprises a first wrench body  1 , a second wrench body  2 , and a control component  3 . Among these, said first wrench body  1  has a first clamping piece  11  and a first handle piece  12  on its two ends, respectively; and said second wrench body  2  has a second clamping piece  21  and a second handle piece  22  on its two ends, respectively. Moreover, the forging flow line of the above said wrench bodies  1 ,  2  extends along the extension direction of the wrench bodies  1 ,  2  as shown in  FIGS. 4 and 5 , and as a result increases the tensile strength of the two wrench bodies  1 ,  2  in this direction. 
         [0031]    Accordingly, said first wrench body  1  comprises an actuating piece  13  between said first clamping piece  11  and said first handle piece  12 , and said actuating piece  13  comprises a penetrating tooth space  14 . Said tooth space  14  comprises a plurality of teeth  15  separately on the left and right sides. Furthermore, said tooth space  14  is defined in the form of an arc facing said first handle piece  12 , and one side face  131  of said actuating piece  13  is also in the form of an arc corresponding to the shape of said tooth piece  14 . Besides, the distance between the teeth  15  of the two sides of said tooth space  14  is defined by the width of the tooth space  14 , and in this embodiment, each tooth  15  extends facing one another in an inclined manner towards the upper portion, and as a result the width of said tooth space  14  varies from a narrower upper portion to a wider lower portion. On the contrary, each tooth  15  can also be shaped in another structure where they are inclined towards the lower portion, and as a result the width of said tooth space  14  would vary from a wider upper portion to a narrower lower portion. 
         [0032]    On the other hand, said second wrench body  2  comprises a perforation  23  with a stepped surface  231  between said second clamping piece  21  and said second handle piece  22 , and said second wrench body  2  and therefore the perforation  23  directly face the tooth space  14  of said first wrench body  1  and also intersect with said first wrench body  1  on top of each other. Moreover, a control component  3  is passed through said perforation  23  and said tooth space  14  in order to pin joint said first wrench body  1  and said second wrench body  2 . Among these, a blocking piece  24  is positioned near said second clamping piece  21  of said second wrench body  2 , and thus, when said second wrench body  2  is opened with regard to said first wrench body  1 , said blocking piece  24  is blocked by the side face  131  of the actuating piece  13  of said first wrench body  1 , so that the opening up width of said second wrench body would be restricted. As shown in  FIG. 6 , the arc-shaped structure of the side face  131  of the actuating piece  13  of said first wrench body  1  would increase the opening up width of said second wrench body  2  as compared to the long straight-shaped prior art structure shown in  FIG. 10 , and thereby increase the clamping diameter of the water pipe wrench and make it more convenient during use. 
         [0033]    Besides, as shown in  FIG. 3 , the present embodiment also comprises a bridge joint component  25 . This bridge joint component  25  and said second wrench body  2  together clamp the first wrench body  1 . In other words, the middle part of said bridge joint component  25  has an arched portion  253 , and the two end parts  254  of said arched portion  253  individually comprises a connection hole  251 . On the other hand, two connection blocks  26  are positioned on said second wrench body  2  in the form of protrusions, and these two connection blocks  26  are individually placed at the two sides of the actuating piece  13  of said first wrench body  1 . Accordingly, said bridge joint component  25  and said arched portion  253  straddle over the actuating piece  13  of said first wrench body  1 , so that the connection holes  251  found at both sides and the two connection blocks  26  of said second wrench body  2  would be connected. In this way, said bridge joint component  25  is fixed on said second wrench body  2 , and clamp the first wrench body  1  together with said second wrench body  2 . 
         [0034]    Moreover, the arched middle portion of the above said bridge joint component  25 , while intersecting said first wrench body  1  with said second wrench body  2  in order to pin joint, at the same time, it can maintain the forging flow line to postpone its extending shape, so that prevents each one of the wrench bodies from being bent. Accordingly, the two wrench bodies  1 ,  2  would achieve the effect of high bending strength due to their shapes, and also by means of said bridge joint component  25 , both of them would be stably connected. 
         [0035]    The positions of the pin joints of both above said first wrench body  1  and said second wrench body  2  can be adjusted via said control component  3  in order to set the desired clamping diameter for use. In other words, as shown in  FIGS. 2 and 7 , said control component  3  comprises a column piece  31 , wherein the outer diameter of said column piece  31  is smaller than the width of said tooth space  14 . A pressing piece  32  is found at the top of said column piece  31 , and the bottom part is encircled within a grinding tooth piece  33  and a base plate  34 . In the present embodiment, said grinding tooth piece  33  corresponds to the shape of said tooth piece  14  and thereby forms a trapezoidal shape, and thus fits and engages with the teeth  15  found in the tooth space. The column piece  31  of said control component  3  is passed through said perforation  23  and said tooth space  14 , and said pressing piece  32  is positioned on top of said stepped surface  231 . Said grinding tooth piece  33  engages the teeth  15  of said tooth space  14 , and said base plate  34  is placed into a through hole  252  of said bridge joint component  25 . 
         [0036]    The position of the above said grinding tooth piece  33  can be changed by controlling said control component  3 . In this embodiment, as shown in  FIG. 7 , a flexible component  35  is positioned around the column piece  31  of said control component  3 . The flexible component  35  positioned at this place is a spring, the two ends of which are pushed against said pressing piece  32  and the stepped surface  231  of said perforation, respectively; and thereby it would push against said pressing piece  32  elastically so that said grinding tooth piece  33  can normally engage into said tooth space. Moreover, when the user presses on said pressing piece  32  as shown in  FIG. 8 , said flexible component  35  would be contracted, and said grinding tooth piece  33  would break away from said tooth space  14 , so that the relatively fixed state between said first wrench body and said second wrench body would be relieved. 
         [0037]    In another embodiment as shown in  FIG. 9 , said flexible component  35 B can have a trapezoidal outer shape, or in other words, the diameters of the two ends of the component would be different; and accordingly, said flexible component  35 B can have the appearance of the stepped surface  231  part in terms of aperture size and shape, and thus can be suitably mounted to the stepped surface  231  part, and as a result, a change in the external form of the flexible component  35 B can improve its convenience in being installed/mounted on narrow spaces. 
         [0038]    As shown in  FIG. 8 , due to the above mentioned shapes of said tooth space  14  and said grinding tooth piece  33 , during use of said control component  3 , the distance that said pressing piece  32  would move after being pressed on doesn&#39;t have to be very long, or in other words, said grinding tooth piece  33  doesn&#39;t need to be completely separated from said tooth space  14  in order to release said first wrench body from said second wrench body that are fixed to each other. In other words, only a little bit of pressing is required to separate said grinding tooth piece  33  from the teeth  15  found within said tooth space  14 , and thereby the convenience during use would be even more improved. 
         [0039]    Moreover, said grinding tooth piece  33  and the base plate  34  are manufactured by forging/metal injection, which can effectively mould metal and change the metal structure and reinforce metal efficiency, and thus change or adjust the course of the metal flow to be more consistent, or in other words, the external shape of said grinding tooth piece  33  and the base plate  34  can be given according to demand during the forging/metal injection process, and therefore can have relatively good clamping endurance, and thus retain the strength and endurance of the grinding tooth piece  33  during operation.