Patent Publication Number: US-8984728-B2

Title: Drawing device

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to drawing device. 
     2. Description of the Prior Art 
     A conventional drawing device is shown in  FIGS. 8 and 9 . A hook portion  44  of each of the two linkage rod  42  abuts against a side of an object  45  to be drawn out, and a bolt is screwed to abut against a fixed end  46  on which the object  45  is disposed. At the same time, relative to the bolt being screwed downward, a body  40  is moved upward and removes the object  45  from the fixed end  46 . 
     However, all the elements of the previous drawing device are linked together in a pivot manner, so that hooking to the bottom of the object and positioning are difficult. Also, an object in a narrow space is further difficult to be removed. 
     Moreover, the two clipping rods  43  are arc-shaped and bent outward, so that the drawing device is hard to enter a narrow space to operate. Even if the drawing device is able to be placed into a narrow space forcedly, position of hooking may be deviated due to the slanting screwing of the bolt  41 . Thus, the object is unable to be removed from the fixed end. 
     The present invention is, therefore, arisen to obviate or at least mitigate the above mentioned disadvantages. 
     SUMMARY OF THE INVENTION 
     The main object of the present invention is to provide a drawing device, having a plurality of clipping rods to provide easy clamping at numeral co-planar positions. 
     To achieve the above and other objects, a drawing device of the present invention includes a first driving element, a bolt, a plurality of second driving elements, and a plurality of clipping rods. 
     The first driving element has a first driving portion and an axle portion, and the axle portion axially forms a threaded hole. 
     The bolt is screwed with the threaded hole. 
     The second driving rods are spacedly and annularly disposed on and abut against an outer peripheral face of the first driving portion. 
     The clipping rods are rotatably disposed on the second driving elements respectively, and each clipping rod forms a hook portion. 
     When operating, the bolt is able to drive the axle portion and the first driving portion to rotate, and the first driving portion further drives the second driving elements to rotate. And then, the second driving elements drive the clipping rods to move between a first position and a second position respectively. Also, each clipping rod is able to turn relative to one of the second driving elements freely, so that the hook portion of each clipping rod is able to face outward or inward alternatively. 
     Thereby, the clipping rods are able to clamp from numeral co-planar positions, and stability and safety are both improved. 
     The present invention will become more obvious from the following description when taken in connection with the accompanying drawings, which show, for purpose of illustrations only, the preferred embodiment(s) in accordance with the present invention. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a breakdown drawing showing a first embodiment of the present invention; 
         FIG. 2  is a stereogram showing a first embodiment of the present invention; 
         FIG. 3  is an illustration of operation showing a first embodiment of the present invention; 
         FIG. 4  is an illustration of removing a work piece of the present invention; 
         FIG. 5  is an illustration of removing an annular work piece of the present invention; 
         FIG. 6  is a breakdown drawing showing a second embodiment of the present invention; 
         FIG. 7  is a stereogram showing a second embodiment of the present invention; 
         FIG. 8  is a stereogram showing a conventional drawing device; 
         FIG. 9  is an illustration of removing a work piece of a conventional drawing device. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Please refer to  FIG. 1  to  FIG. 5  for a first embodiment of the present invention. The drawing device of the present embodiment includes a cover  10 , an upper shell  11 , a lower shell  12 , a first driving element  14 , a bolt  15 , a plurality of second driving elements  20 , and a plurality of clipping rods  21 . 
     The upper and the lower shells are board-shaped and define a receiving room. The cover  10  is disposed on a side of the upper shell  11  away from the lower shell  12 . The first driving element  14  and the second driving elements  20  are disposed in the receiving room respectively, and a center of each of the upper or the lower shells  11 , 12  forms an axle hole  13 , 131 . In the major embodiment, the cover  10  forms a plurality of sliding slots  101 . More preferably, the sliding slots extend in an arc shape. 
     The first driving element  14  has a first driving portion and an axle portion. An outer peripheral face of the first driving portion forms a plurality of protruding teeth annularly. The axle portion protrudes above the first driving portion and is inserted in the axle hole  13  of the upper shell  11 . A cross-section of the axle portion is a polygon, more preferably a hexagon to correspond to tools which has a hexagonal cross-section. In addition, the axle portion forms a threaded hole  141  axially, and the bolt  15  is screwed with the threaded hole  141 . 
     The second driving elements  20  are spacedly and annularly disposed on and abut against the outer peripheral face of the first driving portion. More preferably, an outer peripheral face of each second driving element  20  annularly forms a plurality of protruding teeth, so that the outer peripheral face of each second driving element  20  is engaged with the outer peripheral face of the first driving portion. 
     An end of each clipping rod  21  is rotatably disposed on a bottom of one of the second driving element  20 , more preferably, on an off-center position of the second driving element  20 . On the other hand, an end of each clipping rod  21  forms a stepped rod and penetrates one of the second driving element  20  from the bottom of the second driving element  20 . Also, the clipping rod  21  protrudes above a top of the second driving element  20  in a predetermined length. In addition, a screwing element  23  is screwed with the clipping rod  21  to position the clipping rod  21  on the second driving element  20 . In the major embodiment, the screwing element  23  is a nut. Besides, the other opposite end of the clipping rod  21  is bent to form a hook portion  22 . 
     Please refer to  FIGS. 6 and 7 , in the second embodiment of the present invention, each second driving element  20  includes a second driving portion and an arm  201 . An outer peripheral face of the second driving portion annularly forms a plurality of protruding teeth to be engaged with the outer peripheral face of the first driving portion. The arm  201  extends from an end of the outer peripheral face, and an end of the clipping rod  21  is rotatably disposed on a free end of the arm  201 . Thus, the second driving portion can be completely received in the receiving room between the upper and the lower shells, and the cover above the upper shell for safety is not necessary anymore. 
     Please refer to  FIGS. 3 and 4  for operation in the major embodiment. When rotating the bolt  15  to directly or indirectly drive the axle portion, the first driving portion, and the second driving elements  20  to rotate, the clipping rods  21  are able to be driven to shift between a first position and a second position. In other words, the clipping rods  21  are shifted in a concentric manner when the second driving elements  20  are rotated, so that a diameter which the clipping rods  21  are able to clamp can be adjusted. 
     Please refer to  FIGS. 4 and 5 , each clipping rod  21  is able to turn relative to one of the second driving element  20  freely to enable the hook portion  22  of each clipping rod  21  to face outward or inward alternatively. In practice, the diameter which the clipping rods  21  are able to clamp is adjusted first to enable the clipping rods  21  to approach the work piece  30 , and then the orientation of each hook portions  22  can be adjusted outward (as shown in  FIG. 5 ) or inward (as shown in  FIG. 4 ) to firmly clamp the bottom of work piece  30 . Moreover, a user can rotate each screwing element with a tool which is inserted through one of the sliding hole  101  of the cover  10 , so that orientation of each clipping rod  21  can be easily adjusted. More specifically, the arc shape of each sliding slot  101  corresponds to a shifting path of one of the clipping rod  21 , so that adjustment becomes more convenient. 
     For a better performance, the second driving elements are arranged equidistantly to provide numeral co-planar positions for clamping. In practice, as shown in  FIGS. 4 and 5 , the bolt  15  abuts downward against a terminal end  31  of an axle on which the work piece  30  is disposed to provide a reaction force to remove the work piece  30 . Generally speaking, the work piece is a bearing or an internal ring. 
     Besides, an unfixed terminal sheath  16  can be disposed on a lower end of the bolt  15  to prevent abrasion when the bolt  15  is rotated, as shown in  FIGS. 6 and 7 . 
     Moreover, the clipping rods are straight rod-shaped, and only a lower end of each clipping rod forms a bending hook portion. Thus, the drawing device of the present invention can be employed in a narrow space. 
     In addition, the second driving elements are arranged equidistantly to equalize the force for clamping exerted by each clamping position. Also, the numeral co-planar clamping positions help improve stability and safety of operation.