Abstract:
A dual-head grinding drill machine and a grinding method that include two grinding bases on both ends of a motive power source and each having a grinding wheel. A fixing device separately aligns a left or a right drill or a mill, such that the knives into blade directions can perform a grinding operation on the same grinding machine. A pneumatic motor is installed to match with a sucking passage for discharging drill bits from the positions of two grinding wheels, so as to achieve an extensive applicability and an environmental protection effect. The multi-axis deflective and bias design of the grinding base provides a diversified grinding design for grinding a blade stationary point for different requirements and a blade belly with a different curvature.

Description:
CROSS-REFERENCES TO RELATED APPLICATIONS  
       [0001]     The present invention is a continuation-in-part application of the co-pending U.S. application Ser. No. 11/078,346, filed on Mar. 14, 2005. 
     
    
     FIELD OF THE INVENTION  
       [0002]     The present invention relates to a dual-head grinding drill machine and a grinding method, and more particularly to a grinding machine having two heads for simultaneously grinding a left blade and a right blade of a drill or other knife, and a grinding base having a multi-axis deflection to meet different requirements.  
       BACKGROUND OF THE INVENTION  
       [0003]     U.S. Pat. No. 6,517,411 discloses a design of a grinding machine having two grinding wheels, but such machine is a large machine which is not portable, and the two grinding wheels are driven by different motive power sources, and thus causing inconvenience for their use and wasting energy. Further, a small change of the grinding angle is allowed by adjusting the length of the grinding wheel, but the grinding cannot carry out the grinding process by the left and right rotating blades, and the grind process relies on an operator&#39;s personal skill, or else an error will result easily. Thus, the grinding machines of this sort require further improvements.  
         [0004]     U.S. patent Ser. No. 10/883,856 filed by the inventor of the present invention discloses a structure of a portable grinding drill machine having a grinding wheel driven by a motive power source, but such grinding drill machine still has limited functions for the grinding by a single blade only and cannot meet the requirements of the full utility of the grinding machine.  
       SUMMARY OF THE INVENTION  
       [0005]     In view of the shortcomings of the prior art, the inventor of the invention developed a dual-head grinding drill machine and a grinding method in accordance with the invention, wherein the grinding machine is a portable structure that comes with a design applicable for the blades of left and right knives and provides a more effective way to collect and recycle drill bits and a higher power efficiency, so that the grinding process can meet the practical requirements.  
         [0006]     The primary objective of the present invention is to provide a dual-head grinding drill machine and a grinding method that comprise two grinding wheels disposed on both sides of a motive power source, and each grinding wheel includes a first grinding base with a multiple-axis deflection grounding edge and a grinding acute-angled stationary point, and a seconding grinding base with a stationary point of variable depths, so that the whole grinding machine can perform a manufacturing process by a left rotary or right rotary bladed drill or knife and the motive power source could be a pneumatic power having a design of a sucking passage to facilitate a compulsory elimination of drill bits for the grinding wheel, so as to achieve the environmental protection requirements. With the design of the first grinding base with a multiple-axis deflection and the second grinding base with an adjustable position, the invention can be used to fit different requirements and extensively used in different areas. 
     
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0007]     The present invention will now be described in more detail hereinafter with reference to the accompanying drawings that show various embodiments of the invention, in which:  
         [0008]      FIG. 1  is a perspective view of the present invention;  
         [0009]      FIG. 2  is a schematic view of opening a hood according to the present invention;  
         [0010]      FIG. 3  is an exploded view of a whole system of the present invention;  
         [0011]      FIG. 4  is an enlarged view of a second grinding base of the present invention;  
         [0012]      FIG. 5  is an enlarged view of a fixing device of the present invention;  
         [0013]      FIG. 6  is a schematic view of the design of a single-head grinding base of the present invention;  
         [0014]      FIG. 7-1  shows a front plane view of the ground object which is located corresponding to the axial points of the shifting axle;  
         [0015]      FIG. 7-2  shows a top plane view of the ground object which is located corresponding to the axial points of the shifting axle;  
         [0016]      FIG. 7-3  shows a side plane view of the ground object which is located corresponding to the axial points of the shifting axle;  
         [0017]      FIG. 8-1  shows the front view of the ground object;  
         [0018]      FIG. 8-2  shows the top view of the ground object;  
         [0019]      FIG. 9  shows the ground object of  FIG. 8-1 ;  
         [0020]      FIG. 10  is a top view to show that the pivoting point of the base member shifts;  
         [0021]      FIG. 11  shows the deviating member and the bias rotary member, and  
         [0022]      FIG. 12  shows a top view of the combination of the the deviating member and the bias rotary member. 
     
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS  
       [0023]     To make it easier for our examiner to understand the structure, innovative features and other objectives of the present invention, the invention will now be described in more detail hereinafter with reference to the accompanying drawings that show various embodiments of the invention. However, the drawings are provided for illustrating the preferred embodiments and not intended for limiting the scope of the invention.  
         [0024]     Referring to FIGS.  1  to  3 , the invention comprises a base  100 , a motive power source  10  disposed on the base  100 , and both ends of the motive power source  10  are extended to both ends of the motive power axle  11  and passed and fixed to a support member  12  on the base  100 , two grinding wheels  13 , a heat dissipating vane  14  disposed at an external side of the grinding wheel  13  for providing a heat dissipation while performing the grinding operation, and a hood  15  pivotally coupled to both sides of the base  100  for covering the grinding wheels  13 .  
         [0025]     The hood  15  includes a first grinding base  20  and a second grinding base  30  disposed at the front side and the top side of the hood  15 , and a clamping tool  40  for clamping a ground object  99  to cope with the operations of the first grinding base  20  and the second grinding base  30 . The front distal surface of the base  100  includes a plurality of fixing devices  50  for fixing the ground object  99  clamped by the clamping tool  40  and maintaining the best position to be fixed with the clamping tool  40 , so that the overall operation can meet the grinding drill or other knife requirements for the blade edges of the ground object  99 .  
         [0026]     The first grinding base  20  includes a base member  21 , a curved sliding groove  210  disposed at the bottom of the base member  21  for securing a fixing bolt onto the base  100 , a pivot portion  211  formed at the bottom of the base member  21  for passing and fixing a pivot onto the base  100  and allowing the base member  21  to use the pivot as a deflection center.  
         [0027]     The base member  21  includes a bias rotary base  22  pivotally coupled to a perpendicular wall of the base member  21  and two fixing pillars  220  disposed on a perpendicular surface of the rotary base  22  for latching the clamping tool  40 , such that the clamping tool  40  and the rotary base  22  can be rotated as a whole, and the rotary base  22  includes a flat and straight limit portion  221  corresponding to the perpendicular wall of the base member  21 , and two limit pillars  212  disposed on the base member  21 , so as to limit the rotary base  22  and the clamping tool  40  as well as the angle of deflection when the ground object  99  is ground at the first grinding base  20 .  
         [0028]     The second grinding base  30  includes a base member  31  fixed onto the support member  12  as shown in  FIG. 4 , and an end of the base member  31  is pivotally coupled to the support member  12  by a pivot  32 , and another end of the base member  31  includes a fixing bolt  33  and a central axle of a cam control button  34  that passes through the support member  12 , wherein the fixing bolt  33  is screwed onto the base member  31 , and the central axle of the control button  34  controls a cam type propping member  35  for propping the bottom of the base member  31 , such that the base member  31  can change its inclination to achieve the different cutting requirements.  
         [0029]     The clamping tool  40  includes a clamping member  41  and a compressing member  42  screwed onto the clamping member  41 , and the clamping member  41  includes an elastic cylindrical clamp structure therein, and the exterior of the clamping member  41  is screwed with the compressing member  42  and includes a plug-unplug structure such that when the compressing member  42  is secured onto the clamping member  41 , a clamping action is produced onto the ground object  99  in the clamping member  41 , and an end of the clamping member  41  forms a sheathing portion  410  with a smaller diameter to collocate with the first and second grinding bases  20 ,  30 , and an end of the sheathing portion  410  with a larger diameter forms a flat and straight limit portion  411  for limiting the position of each grinding base  20 ,  30  and the limit pillar on the fixing device. The quantity of the limit portions  411  is set according to the quantity of blades of the ground object  99  such as a drill.  
         [0030]     Referring to  FIG. 5 , the fixing device  50  includes a transversally laid L-shape base member  51 , a receiving portion  510  in the form of a through hole disposed at the front end of the base member  51 , and a limit pillar  511  disposed at an external edge of the receiving portion  510  for latching and fixing the limit portion  411  on the clamping member  41 , and a horizontal position at another end of the base member  51  includes a cylindrical seat  52 , and the seat  52  includes a hollow for installing a resilient member  53  in the form of a loop spring and a fixing base  54  disposed at the top of the seat  52 , and the bottom of the fixing base  54  includes a sunken limit portion  540  corresponding to the seat  52 , and the middle of the fixing base  54  includes a screw-type fixing member  55  with its central axle portion passing and fixing into the bottom of the hollow of the seat  52  by a thread end of the central axle of the fixing member  55 , such that the fixing member  55  can compress and fix the fixing base  54  to the top of the seat  52 , and the periphery of the fixing base  54  and the blade at the tip of the ground object  99  correspond to the fixing portion  541 . In this preferred embodiment, there are four surfaces with different inclinations, and thus the invention has a total of two fixing devices  50 , each having a fixing base  54  with four fixing portions  541  of different inclination, so that the structure of the invention fits the blades of more than eight different kinds of ground objects  99 .  
         [0031]     Further, the space at the bottom of the base  100  includes a large drawer-type object containing member  60 , and the object containing member  60  includes a rack  61  therein for placing the clamping tools that clamp different ground objects  99 .  
         [0032]     The motive power source  10  of the invention could be a general electric motor, or a wind power motor as shown in  FIG. 3 , and an end of the wind power motor is an air incoming end  101  and the other end is an air outgoing end  102 , and a sucking passage  103  is extended from the wind power motor on the base  100 , and an opening of the sucking passage  103  is disposed at two grinding wheels  13 , such that when the motive power source  10  is turned on, the sucking passage  103  forms a negative pressure to suck the drill bits remained after a grinding process by the grinding wheel  13  through the sucking passage  103 , and the air outgoing end  102  of the motive power source  10  discharges the drill bits into a collector, so that the waste bits will not leak into the air. Therefore, the invention can meet the environmental protection requirements.  
         [0033]     The rotary base  22  installed at the base member  21  of the first grinding base  20  corresponds to the structure as shown in  FIG. 7 , and the bias center and deflection of the bias rotary base  22  pivotally coupled to a perpendicular wall of the base member  21  form a multi-axial deflection mode. The perpendicular wall of the base member  21  includes a rotary base installing portion  213  in the form of a hole, and the rotary base  22  includes a tool installing portion  222  in the form of a hole disposed at the position of the clamping tool  40 , and the axle center of the ground object at the center of the clamping tool  40  in contact with the surface of the grinding wheel  13  is a cutting center C, and the projected point of the cutting center C projected onto a perpendicular surface of the base member  21  is a horizontal axial point C′, and the center of the tool installing portion  222  is shifted by the horizontal axial point C′ downward to form a bias axial point A. If the base member  21  is rotated on the rotary base  22  to drive the clamping tool  40  and the ground object  99 , the tip of the axle center of the ground object  99  will be fixed motionlessly at the cutting center C, and the tip and peripheral surface of the ground object  99  will go around the horizontal axial point C′ along the bias axial point A for approximately 90 degrees to a grinding deviation B to produce cutting and grinding effects. In the present invention, the rotary base installing portion  213  of the base member  21  further includes a horizontal offset axial point A′ which is in the form of a slanting hole for aligning the first shifting axle CA′ of the base member  21  of the rotary base  22  at a shifting angle from −10 to 10 degrees with respect to the reference axis CC′, and aligning the second shifting axle CA of tool installing portion  222  of the rotary base  22  at 0 to −5 degrees with respect to the reference axis, such that the rotary base  22  rotates on the base member  21  in a grinding process, the clamping tool  40  and the ground object  99  shift the first shifting axle CA′ and the second shifting axle CA by using the reference axis CC′ as the center, and thus the periphery and the tip of the ground object  99  form different curvatures and cambered surfaces by two different shifting axles moving at the same time.  
         [0034]     Referring to  FIG. 8 , a stationary point  990  is disposed at the center of the tip of the ground object  99  that forms two straight blade edge  991  depending on the required quantity of blade edges, and the blade edge  991  is extended towards a curved blade belly  992  along the direction of the left or right rotary knife, and the end of the blade belly  992  forms a steep-angled bevel  993 , and a bits removing tank  994  is disposed behind a bevel  993 , and a slanting stationary point slot  995  is formed at the bevel  993  extended to the stationary point  990 , wherein the first grinding base  20  is provided for grinding the blade edge  991  and the blade belly  992 , and the second grinding base  30  is provided for grinding the bevel  993  and the stationary point slot  995 . If two shifting axles are used for grinding according to the invention, the two shifting axles are compared with curve BA of the first belly of the second shifting axle CA only. The second belly curve A′B′ ground by the two shifting axles will be quicker and maintain motionless at the stationary point  990  of the ground object  99  and the cutting center C in a non-proportional manner, and only the blade belly  992  portion is cut. In the preferred embodiment as shown in the figures, the first shifting axle CA′ and the shift of the reference axis CC′ shift about 0 to 10 degrees. In other words, when the first shifting axle CA′ shifts, the blade belly  992  leans towards the surface of the grinding wheel  13  quickly to form a larger slanting curvature of the blade belly  992 , and the support of the blade edge  991  is decreased, and the strength of the blade edge  991  is decreased. If the surface of a softer work piece is milled and the angle of the first shifting axle CA′ with respect to the reference axis CC′ is negative, then the grinding quantity of the blade belly  992  will be decreased and the slanting curvature becomes flat, and the support of the blade edge  991  becomes larger, and thus the ground object  99  and the work piece can stand larger milling force, which is suitable for grinding the surface of a harder work piece.  
         [0035]     In the invention, the rotary base installing portion  213  on the base member  21  further comprises a horizontal offset axial point A′ which is in the form of a slanting hole, so that the first shifting axle CA′ of the rotary base  22  on the base member  21  is the same as the first preferred embodiment of the present invention. In  FIG. 10 , the pivot portion  211  at the bottom of the base member  21  is provided for passing and fixing a pivot into the pivoting point  211 A of the base  100  according to the foregoing shifting angle at the shifting axle point A′ for a compensatory displacement that is shifted to the pivoting point  211 B,  211 C, and the rotary base installing portion  213  on the base member  21  maintains perpendicular to the perpendicular portion of the base member  21  and not in the form of a slanting hole, so as to achieve the aforementioned effect of enhancing the cutting function. With the same design, another deviating member  23  is installed between the base member  21  and the rotary base  22  or between the rotary base  22  and the clamping tool  40  to achieve the same effect. Taking the clamping tool  40  installed at the deviating member  23  and the rotary base  22  for example, the clamping tool  40  is installed into the deviating member  23  and placed into the receiving portion  230 , and the exterior forms a sheathing portion  231  having a flange with a large diameter at an end and a small diameter at the other end, wherein the hole position of the sheathing portion  231  is concentric with the center of the rotary base  22 , and the receiving portion  230  can be designed as a slanting hole according to the differences of a slope and a position at the shifting axle point A′, so as to change the position of the center for passing through the ground object  99  and achieve the multi-axis grinding effect. The receiving portion  230  can be installed at the bias center position of the sheathing portion  231  according to the length of the blade belly  992  as shown in  FIG. 12  for grinding the ground object  99  that has blade edges  991  with different lengths on both sides.  
         [0036]     Another characteristic of the present invention resides on that a back grinding side  130  of the grinding wheel  13  is in the form of an inwardly slanting acute angle substantially maintaining an angle from 0 degree to 5 degrees with a parallel line on the backside of the grinding wheel  13 , so that when the ground object  99  carries out a cutting process on the second grinding base  30 , a stationary point slot  995  formed on a slide of the blade edge  991  proximate to the stationary point  990  is not perpendicular to the blade edge  991  and has an inwardly slanting angle from 0 degree to 5 degrees from the vertical direction, so as to reduce or eliminate any obstruction to the drill bits eliminating function.  
         [0037]     In the present invention, both ends of the motive power source  10  correspond to the first and second grinding bases  20 ,  30 , and also correspond to another group of first and second grinding bases  20 ,  30  as shown in  FIG. 6 , so that both heads of the grinding machine have four grounds of different grinding bases  20 ,  30  each to cope with different grinding requirements.  
         [0038]     In summation of the above description, the present invention herein enhances the performance than the conventional structure and further complies with the patent application requirements