Patent Publication Number: US-7584913-B1

Title: Safety switch of a paper shredder

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a safety switch of a paper shredder, and more particularly to a safety switch installed on a paper shredder, wherein the switch is used to cut off a power switch momentarily at a same time when a scrap paper bin is opened, by using a principle of magnetic repulsion and attraction. 
     2. Description of the Prior Art 
     All paper shredders are installed with power switches. As a user often forgets to turn off the power switch after shredding papers, it is possible that fingers can be cut when the user pulls out a scrap paper bin to clear paper chips, due to that the power switch has not been turned off. 
     SUMMARY OF THE INVENTION 
     Accordingly, the primary object of the present invention is to provide a safety switch of a paper shredder, wherein a safety switch is located at a proper position on the paper shredder, and another magnet is installed on a scrap paper bin or a door panel, such that when the scrap paper bin is positioned, power will be turned on due to that a magnetic block of the safety switch is repulsed or attracted by the magnet; and when the scrap paper bin is pulled out to release the magnet from the magnetic block, the power is cut off momentarily by the safety switch. 
     To enable a further understanding of the said objectives and the technological methods of the invention herein, the brief description of the drawings below is followed by the detailed description of the preferred embodiments. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS  
         FIG. 1  shows a schematic view of a usage state of the present invention. 
         FIG. 2  shows a perspective view of a safety switch of the present invention. 
         FIG. 3  shows a local exploded view of a safety switch of the present invention. 
         FIG. 4  shows a cutaway view of a safety switch of the present invention (power is cut off). 
         FIG. 5  shows another cutaway view of a safety switch of the present invention (power is turned on). 
         FIG. 6  shows a schematic view of an embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Referring to  FIGS. 1 , in addition to that a paper shredder  10  of the present invention is provided with a power switch  11 , the paper shredder  10  is also installed with another safety switch  12 , and an end of a scrap paper bin  20  is installed with a magnet  21 . 
     Referring to  FIGS. 2 to 4 , the safety switch  12  includes two housings  121 ,  122 ; a switch  123 , which is installed in the two housings  121 ,  122 , an end of which is provided with a push button  1231 , and the other end of which is connected with two power cords  1231  for switching on; and a magnetic block  124 , which is located at a front end of the push button  1231  of the switch  123 . 
     Referring to  FIG. 5 , when the scrap paper bin  20  is installed in an interior of the paper shredder  10 , the magnet  21  is close to the safety switch  12 , and repulses or attracts the magnetic block  124  to touch the push button  1231 , so as to form an energized state. 
     Referring to  FIG. 4 , when the scrap paper bin  20  is pulled out to release the magnet  21  from the magnetic block  124 , the magnetic block  124  will be separated from the push button  1231 , due to that it is not repulsed or attracted by the magnet  21 , thereby forming a non-energized state. Therefore, even when the power switch  11  of the paper shredder  10  is turned on, the paper shredder  10  will not operate. 
     Referring to  FIG. 6 , a scrap paper bin is emplaced inside a door panel  13  of the paper shredder  10 , the door panel  13  is installed with the magnet  21 , and the safety switch  12  is installed at a position close to an edge of the door panel  13 . When the door panel  13  is opened, as the magnetic block of the safety switch  12  is not repulsed or attracted by the magnet  21 , it is separated with the push button to form the non-energized state. 
     Accordingly, the present invention includes a safety switch  12  which is installed on an ordinary paper shredder  10 , such that when a user pulls out a scrap paper bin  20  without turning off a power switch  11  carelessly, the safety switch  12  will immediately cut off the power switch  11 . 
     It is of course to be understood that the embodiments described herein is merely illustrative of the principles of the invention and that a wide variety of modifications thereto may be effected by persons skilled in the art without departing from the spirit and scope of the invention as set forth in the following claims.