Grinder for windshield wipers

Abstract

A grinder includes a first side, a second side, a first piece of sandpaper attached to the first side and a second piece of sandpaper attached to the second side. The second piece of sandpaper is finer than the first piece of sandpaper. The first piece of sandpaper is used to grind and turn a tip of a rubber strip of a windshield wiper from broken to flat quickly. The second piece of sandpaper is used to make the tip of the rubber strip of the windshield wiper smooth. A first mark is provided on the first side for indicating a first step of a grinding process. A second mark is provided on the second side for indicating a second step of the grinding process.

1 . A grinder for a windshield wiper, the grinder comprising: 
 a housing including a top, a bottom, first and second ends and first and second flanks, with the top being opposite to the bottom;    a first piece of sandpaper attached to the top;    a second piece of sandpaper attached to the bottom, wherein the second piece of sandpaper is fine sandpaper and the first piece of sandpaper is coarse sandpaper;    a first mark on the top for indicating a first step of a grinding process using the coarse sandpaper; and    a second mark on the bottom for indicating a second step of the grinding process using the fine sandpaper.    
   
   
       2 . The grinder according to  claim 1  wherein the first mark is an embossment.  
   
   
       3 . The grinder according to  claim 1  wherein the first mark is an intaglio.  
   
   
       4 . The grinder according to  claim 1  wherein the second mark is an embossment.  
   
   
       5 . The grinder according to  claim 1  wherein the second mark is an intaglio.  
   
   
       6 . The grinder according to  claim 1  wherein the top defines a groove for receiving the first piece of sandpaper, with the groove extending between the first and second ends and spaced from the first and second flanks.  
   
   
       7 . The grinder according to  claim 1  wherein the top is outwardly convex from the bottom and between the first and second flanks.  
   
   
       8 . The grinder according to  claim 7  wherein the top defines a groove for receiving the first piece of sandpaper, with the groove extending between the first and second ends and spaced from the first and second flanks.  
   
   
       9 . The grinder according to  claim 8  wherein the top comprises two lateral portions between which the groove is located, wherein the first mark is provided on one of the lateral portions.  
   
   
       10 . The grinder according to  claim 1  wherein the bottom defines a groove for receiving the second piece of sandpaper, with the groove extending between the first and second ends and spaced from the first and second flanks.  
   
   
       11 . The grinder according to  claim 1  wherein the bottom is outwardly convex from the top and between the first and second flanks.  
   
   
       12 . The grinder according to  claim 11  wherein the bottom defines a groove for receiving the second piece of sandpaper, with the groove extending between the first and second ends and spaced from the first and second flanks.  
   
   
       13 . The grinder according to  claim 12  wherein the bottom comprises two lateral portions between which the groove is located, wherein the second mark is provided on one of the lateral portions.  
   
   
       14 . (canceled)  
   
   
       15 . The grinder according to  claim 1  wherein the flanks are concave towards each other and between the first and second ends.  
   
   
       16 . The grinder according to  claim 13  wherein the top is outwardly convex from the bottom and between the first and second flanks.  
   
   
       17 . The grinder according to  claim 16  wherein the top defines a groove for receiving the first piece of sandpaper, with the groove of the top extending between the first and second ends and spaced from the first and second flanks.  
   
   
       18 . The grinder according to  claim 17  wherein the top comprises two lateral portions between which the groove of the top is located, wherein the first mark is provided on one of the lateral portions of the top.  
   
   
       19 . The grinder according to  claim 18  wherein the flanks are concave towards each other and between the first and second ends.  
   
   
       20 . The grinder according to  claim 19  wherein the first and second ends are tapered between the top and the bottom.