Patent Publication Number: US-10773354-B2

Title: Grinding machine with transverse moving unit

Description:
BACKGROUND OF THE INVENTION 
     1. Fields of the Invention 
     The present invention relates to a grinding machine, and more particularly, to a transverse moving unit of a grinding machine so as to grind a larger area of an object. 
     2. Descriptions of Related Art 
     The conventional grinding machine is mainly used to grind metal or wood objects, and generally comprises a plate on which the object is positioned. In other words, the conventional grinding machine cannot grind the object that is wider than the plate. Besides, the conventional plate cannot be folded so that it occupies a lot space. 
     The present invention intends to provide a grinding machine that has a transverse moving unit so as to grind a larger area of an object. 
     SUMMARY OF THE INVENTION 
     The present invention relates to a grinding machine and comprises a base having a plate installed on top thereof, and a movable device is connected to the plate. A driving unit is connected to one end of the base and has a first motor which includes a hollow shaft with an oval hole. A grinding unit is located over a top of the plate and includes a body and a grinding part. The grinding part is slidably connected to a slot of the body. The grinding part has a shaft unit which is located in the oval hole of the hollow shaft. A transverse moving unit is connected to the grinding part of the grinding unit and has a second driving motor and a cam link. The cam link is connected between the second driving motor and the grinding part. The transverse moving unit is movable within the slot of the body to move the grinding part transversely relative to the plate. 
     Preferably, the shaft unit includes a shaft coupled to a grinding wheel. Two blocks are respectively connected to the shaft. 
     Preferably, the second driving motor is a variable-speed motor or a fixed-speed motor. 
     Preferably, the driving unit includes a frame to which the first motor is mounted. 
     Preferably, the frame includes a hook on one side thereof. 
     Preferably, the plate includes a main plate and two secondary plates which are respectively and pivotably connected to two sides of the main plate. 
     The primary object of the present invention is to provide a grinding machine that has a transverse moving unit so as to grind a larger area of an object. 
     Another object of the present invention is to provide a grinding machine wherein the plate can be folded. 
     The present invention will become more obvious from the following description when taken in connection with the accompanying drawings which show, for purposes of illustration only, a preferred embodiment in accordance with the present invention. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a perspective view to show the grinding machine of the present invention; 
         FIG. 2  is a side view to show the grinding machine of the present invention; 
         FIG. 3  is an exploded view of the grinding machine of the present invention; 
         FIG. 4  is an enlarged view of a portion of the grinding machine of the present invention in  FIG. 2 ; 
         FIG. 5  shows the end cross sectional view of the transverse moving unit of the grinding machine of the present invention; 
         FIG. 6  is a top view of the transverse moving unit of the grinding machine of the present invention; 
         FIG. 6 a    shows the operational status of the transverse moving unit of the grinding machine of the present invention; 
         FIG. 7  shows that grinding wheel of the grinding part of the transverse moving unit is connected to be driven by the first driving motor; 
         FIG. 8  shows another view of certain portions of the grinding part of the transverse moving unit connected to be transversely movable relative to a hollow shaft of the first driving motor, and 
         FIG. 9  shows that the secondary plate is foldable relative to the main plate. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     Referring to  FIGS. 1 to 8 , the grinding machine “A” of the present invention is designed to grind a wider object  5 , and comprises a base  1  which includes a plate  11  on the top thereof, and a movable device  12  is provided on the plate  11  as shown in  FIG. 1 . The movable device  12  moves the object along the plate. The plate  11  includes a main plate  111  and two secondary plates  112  which are respectively and pivotably connected to two sides of the main plate  111 . 
     A driving unit  2  is connected to one end of the base  1  and has a frame  20  on which a first motor  21  is mounted. The frame  20  includes a hook  22  on one side thereof as shown in  FIG. 1  so as to hang other parts or tools. The frame  20  is able to adjust the height of the first driving motor  21 . The first motor  21  drives a hollow shaft  211  which includes an oval hole  212  defined radially through the hollow shaft  211 . 
     A grinding unit  3  is located above the plate  11  and includes a body  31  and a grinding part  32 . The grinding part  32  is slidably connected to a slot  311  of the body  31 . The grinding part  32  includes a bracket  33  and a grinding wheel  34  for grinding the object  5  supported on the plate  11  underneath, as illustrated in  FIG. 2 . The grinding wheel is mounted to the bracket  33  and driven by a shaft unit  35  which engages the hollow shaft  211  of the first motor  21 , as shown in  FIGS. 7 and 8 . The shaft unit  35  includes a shaft  351  and two blocks  352  respectively connected to the shaft  351  which extend out through the oval hole  212  to limit transverse movement of the shaft  351  relative to the hollow shaft  211 , as indicated by the arrows in  FIG. 8 . 
     A transverse moving unit  4  is connected to the bracket  33  of the grinding part  32  of the grinding unit  3  and includes a second driving motor  41  and a cam link  42 . The cam link  42  is connected between the second driving motor  41  and the bracket  33  of the grinding part  32 . Specifically, the cam link  42  performs as a cam which the second driving motor  41  drives. The transverse moving unit  4  generates movement of the grinding part  32  along the slot  311  of the body  31  transversely relative to the plate  11 . It is noted that the second driving motor  41  may be a variable-speed motor or a fixed-speed motor. 
     The second driving motor  41  drives the cam link  42 , and the cam link  42  further drives the grinding part  32  to be movable in the slot  311  of the body  31  as shown in  FIGS. 2 and 6   a , so that the object having a larger width than the plate  11  can be ground thereon. 
     The second driving motor  41  shown is a variable-speed motor such that the speed that the transverse moving unit  4  moves transversely across the plate  11  can be controlled. When grinding a wider object  5  on the plate  11 , the grinding part  32  can be controlled to be moved back and forth in the slot  311  by the transverse moving unit  4  to grind the wider object  5 . 
     Furthermore, as shown in  FIGS. 2 and 9 , the two secondary plates  112  can be folded relative to the main plate  111  to save storage space. When the two secondary plates  112  are expanded, the wider object  5  can be well supported. 
     While we have shown and described the embodiment in accordance with the present invention, it should be clear to those skilled in the art that further embodiments may be made without departing from the scope of the present invention.