Patent Publication Number: US-7712398-B2

Title: Spring plier

Description:
BACKGROUND OF THE INVENTION 
   (a) Technical Field of the Invention 
   The present invention relates to plier, in particular, a plier which is detachable or replaceable plier legs. 
   (b) Description of the Prior Art 
     FIG. 5  shows a conventional plier published in Taiwanese Publication No. 122049.  FIG. 6  shows another conventional plier published in Taiwanese Publication No. 223294. In these two pliers, the unloading of the leg is done by using a screw to urge a pressing plate. This way of unloading the leg may cause incomplete urging and the exertion force may cause the leg to loose. 
   Further, the C-shaped ring is highly elastic and if the operation action is not accurate, the C-shaped ring may be sprang out, which may hurt people. Thus, it is an object of the present invention to provide a spring plier to mitigate the above drawback. 
   SUMMARY OF THE INVENTION 
   The primary purpose of the present invention is to provide a spring plier comprising a clipping handle and two symmetrical plier leg plates, and the clipping handle including two reverse direction similar shape plier plates mounted with rivets, the handle mounted with a cover, characterized in that the front end of the two clipping plier plate are respectively provided with a screw hole and a protruded post, the two plier leg plate corresponding to the screw hole and the protruded post are provided with a L-shaped fastening slot and an oval hole, and the front end is a pointed insertion leg, the L-shaped fastening slot engages at a screw fastened to the screw hole at the front end of the plier plate, and the oval hole is placed onto the protruded post, the oval hole provides fine adjustment of leg plate and provides a tolerance facilitating loading and unloading of leg plate, then the screw is tighten so as to secure and limit the two leg plates. 
   Yet still an object of the present invention is to provide a spring plier, wherein the fastening slot on the leg plate is of opened slot allowing appropriate fastening. 
   Another object of the present invention is to provide a spring plier, wherein the front end pointed insertion leg of the leg plate is bent to an appropriate angle to provide unloading and loading of C-ring fastener. 
   The foregoing object and summary provide only a brief introduction to the present invention. To fully appreciate these and other objects of the present invention as well as the invention itself, all of which will become apparent to those skilled in the art, the following detailed description of the invention and the claims should be read in conjunction with the accompanying drawings. Throughout the specification and drawings identical reference numerals refer to identical or similar parts. 
   Many other advantages and features of the present invention will become manifest to those versed in the art upon making reference to the detailed description and the accompanying sheets of drawings in which a preferred structural embodiment incorporating the principles of the present invention is shown by way of illustrative example. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
       FIG. 1  is a schematic view of a spring plier in accordance with the present invention. 
       FIG. 2  is an exploded perspective view of a spring plier of the present invention. 
       FIG. 3  is a schematic view showing the screw and the protruded post at the front end of the handle in accordance with the present invention. 
       FIG. 4  is a schematic view showing the appropriate bending angle at the peg plate of the present invention. 
       FIG. 5  shows a conventional in Taiwan Publication No. 122049. 
       FIG. 6  shows a conventional art in Taiwan Publication No. 223294. 
   

   DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
   The following descriptions are of exemplary embodiments only, and are not intended to limit the scope, applicability or configuration of the invention in any way. Rather, the following description provides a convenient illustration for implementing exemplary embodiments of the invention. Various changes to the described embodiments may be made in the function and arrangement of the elements described without departing from the scope of the invention as set forth in the appended claims. 
   Referring to  FIGS. 1 and 2 , there is shown a perspective view of a spring plier comprising a pair of plier handle  1  and two leg plate  2  mounted at the front end of the handle  1 . The handle  1  is formed from two reverse direction similar shape clipping plates  11 ,  12  riveted with rivet  3 . The front ends of the clipping plates  11 ,  12  are provided with screw holes  110 ,  120  and a protruded post  111 ,  121 . 
   On the leg plate  2  corresponding to the screw hole  110 ,  120  and the protruded post  111 ,  121  on the front end of the clipping plate  11 ,  12 , an L-shaped slot  20  and an oval hole  21  are formed, and the front end of the leg plate  2  is a pointed leg  22 . The L-shaped slot  20  engaged at the screw  4  passing through the screw holes  110 ,  120  and the oval hole  21  is exactly positioned onto the protruded posts  111 ,  121  such that the oval hole  21  provides fine adjustment of the leg plate facilitating tolerance space to load and unload the leg plate  2 . Finally, the screw  4  at the screw hole  110 ,  120  is tighten and the two leg plates  2  are positioned. 
   There is a cavity  5  at the lower end of the rivet point of the two clipping plates  11 ,  12  and the two ends symmetrical to the cavity  5  are provided with a single side protruded block  50 . The protruded block  50  is used to hold a compression spring  6  so as to provide extension when the handle  1  clips the clipping plates  11 ,  12  so as to restore to an open position. 
   As shown in  FIG. 3 , there is shown the action of protruded post with respect to the screw at the front end of the handle, wherein the L-shaped slot  20  and the oval hole  21  respectively engages with the screw holes  110 ,  120  and the protruded post  111 ,  121 . In  FIG. 3 , the solid line indicates the leg plate before it is combined, and the dotted line indicates after it is combined. When the oval hole is fitted to the protruded post  111 ,  121 , i.e., the oval hole  21  possesses a tolerance space to adjust, after that the L-shaped slot  20  is mounted to the screw  4 , the oval hole  21  is slidable within the tolerance space. The screw  4  is used to lock the leg plate  2  to the front end of the clipping plates  11 ,  12 . 
   The oval hole  21  allows the screw  4  to be lifted a short distance so that the leg plate  4  can be secured, and slight adjust the screw  4  to lock. 
   In the present invention, the L-shaped slot  20  and the oval hole  21  are fastened at the screw hole  110 ,  120  and the protruded post  111 ,  121 , wherein the L-shaped slot  20  engagement is related to the force exertion direction of the loading and unloading of the C-shaped ring, which can effectively cause the leg plate  2  to be clipped on the handle  1  so that the force exerted by the leg plate  2  will not bias. 
   When loading or unloading C ring fastener, due to the restriction of the size of the C-ring fastener and the space to carry out the action, the size and specification of the pointed leg  22  can be made into different size, or the pointed leg  22  can be bent to an appropriate angle, as shown in  FIG. 4 , this will allow the plier to be used in all environment. 
   It will be understood that each of the elements described above, or two or more together may also find a useful application in other types of methods differing from the type described above. 
   While certain novel features of this invention have been shown and described and are pointed out in the annexed claim, it is not intended to be limited to the details above, since it will be understood that various omissions, modifications, substitutions and changes in the forms and details of the device illustrated and in its operation can be made by those skilled in the art without departing in any way from the spirit of the present invention.