Patent Publication Number: US-9896931-B2

Title: Cutting tool holding device

Description:
RELATED APPLICATIONS 
     This application claims priority to China Application Serial Number 201520179252.5, filed Mar. 27, 2015, which is herein incorporated by reference. 
     BACKGROUND 
     Technical Field 
     The present disclosure relates to a holding device. More particularly, the present disclosure relates to a cutting tool holding device. 
     Description of Related Art 
     A cutting tool holding device is used to hold a cutting tool and configured to be attached to a road planer for cutting, mining, excavating the ground or applying a surface roughness treatment to a road. 
     Conventionally, the cutting tool holding device includes a base and a cutting tool holder for receiving a cutting, tool. The base is fixed on a peripheral surface of a working member (such as a roller) of a machinery (such as a road planer), and the cutting tool holder is engaged with the base by some fastening members. The cutting tool received in the cutting tool holder is mounted along a tangent of the base for facilitating the excavating or cutting operations applied to the ground. In the working process of the aforementioned machinery, an excavating operation is first applied to a processed material (such as concrete asphalt over a road) by the cutting tool; as the roller rotates, a cutting operation is then applied to the ground by the cutting tool so as to destroy the processed material. 
     In general, the processed material is solid and stiff, and a reaction force generated from the processed material during the working process will exert on the cutting tool. Thus the cutting tool working on it only has a rather limited lifetime. Furthermore, when the base and the cutting tool holder are not firmly engaged, serious damages caused by the reaction force occur in the cutting tool holder and the base. As a result, the cutting tool holder and the base are also in need of the frequent replacement. Consequently, the maintenance cost of the cutting tool holding device is high in the art. 
     Therefore, it is important to reinforce the engagement between the base and the cutting tool holder and increase a load value of the base and the load value of the cutting tool holder for the reaction force of the base and the cutting tool holder for prolonging the life span of the cutting tool holding device so as to reduce the maintenance cost thereof. 
     SUMMARY 
     According to one aspect of the present disclosure, a cutting tool holding device for holding a cutting tool is provided. The cutting tool holding device includes a base, a holder, and a fastening member. The base includes a front rake wall, a back rake wall, and a positioning hole. The front rake wall has a rabbet, and the back rake wall connected to the front rake wall has an angular receiving hole. The positioning hole is penetrated one end of the base and communicated with the angular receiving hole. The holder is mounted on the base for receiving the cutting tool, wherein the holder includes a main body and a tool receiving corner post. The main body includes a first abutting portion and a second abutting portion. The first abutting portion has a first abutting surface and an engaging portion, wherein the first abutting surface is abutted against the front rake wall, and the engaging portion is detachably engaged into the rabbet. The second abutting portion has a second abutting surface abutted against the back rake wall. The tool receiving corner post extending projects from the main body and is correspondingly set into the angular receiving hole, wherein a position limiting groove is formed on the tool receiving corner post corresponded with the positioning hole. The fastening member is fastened in the positioning hole and pressed against the position limiting groove. 
     According to another aspect of the present disclosure, a cutting tool holding device for holding a cutting tool is provided. The cutting tool holding device includes a base, a holder, a fastening member, and a draw bolt member. The base includes a front rake wall, a back rake wall, and a positioning hole. The front rake wall has a rabbet; and the back rake wall connected to the front rake wall has an angular receiving hole. The positioning hole is penetrated one end of the base and communicated with the angular receiving hole. The holder is mounted on the base for receiving the cutting tool, wherein the holder includes a main body and a tool receiving corner post. The main body includes a first abutting portion and a second abutting portion. The first abutting portion has a first abutting surface and an engaging portion, wherein the first abutting surface is abutted against the front rake wall, and the engaging portion is detachably engaged into the rabbet. The second abutting portion has a second abutting, surface abutted against the back rake wall. The tool receiving corner post extending projects from the main body and is correspondingly set into the angular receiving hole, wherein a position limiting groove is formed on the tool receiving corner post corresponded with the positioning hole. The fastening member is movably disposed in the positioning hole and pressed against the position limiting groove, wherein a threaded hole is formed in one end of the fastening member, and a sectional area of the fastening member gradually changes along an extending direction of the fastening member. The draw bolt member is limitedly disposed in the positioning hole, wherein the draw bolt member has a threading portion for screwing into the threaded hole, whereby the draw bolt member draws the fastening member moving in the positioning hole to change a pressing extent between the fastening member and the position limiting groove. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The present disclosure can be more fully understood by reading the following detailed description of the embodiment, with reference made to the accompanying drawings as follows: 
         FIG. 1  is a perspective view of a cutting tool holding device according to the first embodiment of the present disclosure; 
         FIG. 2  is an exploded view of the cutting tool holding device shown in  FIG. 1 ; 
         FIG. 3  is a side view of a holder shown in  FIG. 1 ; 
         FIG. 4  is a partial cross-sectional view of the holder taken along line  4 - 4  of  FIG. 3 ; 
         FIG. 5  is a cross-sectional view of the cutting tool holding device of  FIG. 1 ; 
         FIG. 6  is an operating schematic view of the cutting tool holding device shown in  FIG. 1 ; 
         FIG. 7  is a side view of the holder according to the second embodiment of the present disclosure; 
         FIG. 8  is a cross-sectional view of the cutting tool holding device according to the second embodiment of the present disclosure; 
         FIG. 9  is a perspective view of the cutting tool holding device according to the third embodiment of the present disclosure; 
         FIG. 10  is an exploded view of the cutting tool holding device shown in  FIG. 9 ; 
         FIG. 11  is a side view of the holder shown in  FIG. 9 ; 
         FIG. 12  is a partial cross-sectional view of the holder taken along line  12 - 12  of  FIG. 11 ; 
         FIG. 13  is a partial cross-sectional view of the cutting tool holding device taken along line  13 - 13  of  FIG. 9 ; 
         FIG. 14  is a perspective view of the cutting tool holding device according to the fourth embodiment of the present disclosure; and 
         FIG. 15  is an exploded view of the cutting tool holding device shown in  FIG. 14 . 
     
    
    
     DETAILED DESCRIPTION 
       FIG. 1  is a perspective view of a cutting tool holding device  100  according to the first embodiment of the present disclosure.  FIG. 2  is an exploded view of the cutting tool holding device  100  shown in  FIG. 1 . In  FIGS. 1 and 2 , the cutting tool holding device  100  is for holding a cutting tool B (as shown in  FIG. 6 ). The cutting tool holding device  100  includes a base  110 , a holder  120 , and a fastening member  150 . The holder  120  is mounted on the base  110 , and the fastening member  150  is disposed in the base  110 . 
     The base  110  includes a front rake wall  112 , a back rake wall  114 , a positioning hole  116 , and a first pushing hole  118 . The front rake wall  112  is connected to the back rake wall  114 , wherein the front rake wall  112  has a rabbet  113 , and the front rake wall  112  has an angular receiving hole  115 . The angular receiving hole  115  has a central axis (not shown), wherein the central axis of the angular receiving hole  115  is paralleled to an extending direction of the rabbet  113 . The positioning hole  116  is penetrated one end of the base  110  and communicated with the angular receiving hole  115 . The positioning hole  116  has the central axis (not shown), wherein the central axis of the positioning hole  116  is perpendicular to an extending direction of the angular receiving hole  115 . The first pushing hole  118  is formed on the other side of the base  110  and communicated with the angular receiving hole  115 . 
     The holder  120  is mounted on the base  110  for receiving the cutting tool B, wherein the holder  120  includes a main body  130  and a tool receiving corner post  140 . 
     The main body  130  includes a first abutting portion  132  and a second abutting portion  136 . The first abutting portion  132  has a first abutting surface  133  and an engaging portion  135 , wherein the first abutting surface  133  is abutted against the front rake wall  112 , and the engaging portion  135  is detachably engaged into the rabbet  113 . The second abutting portion  136  has a second abutting surface  137  and a mounting surface  139 . The second abutting surface  137  is a flat surface and is fitting abutted against the back rake wall  114 . The mounting surface  139  is located on the other side of the second abutting surface  137 , and the mounting surface  139  has a holding hole  139   a  for holding the cutting tool B (as shown in  FIG. 6 ). 
     The tool receiving corner post  140  extending projects from the main body  130  and is correspondingly set into the angular receiving hole  115 . A shape of the angular receiving hole  115  is complementary to the shape of the tool receiving corner post  140  so that the tool receiving corner post  140  does not move relative to the base  110  after setting into the angular receiving hole  115 . A position limiting groove  142  is formed on the tool receiving corner post  140  corresponded with the positioning hole  116 . A second pushing hole  146  is formed on the tool receiving corner post  140  near the main body  130 , wherein the second pushing hole  146  is communicated with the holding hole  139   a  and the first pushing hole  118  for removing the cutting tool B. 
     The fastening member  150  is a C-shaped elastic tube. The fastening member  150  is fastened in the positioning hole  116  of the base  110  by an expanding elasticity thereof and pressed against the position limiting groove  142  of the tool receiving corner post  140 . 
       FIG. 3  is a side view of the holder  120  shown in  FIG. 1 .  FIG. 4  is a partial cross-sectional view of the holder  120  taken along line  4 - 4  of  FIG. 3 . In  FIGS. 3 and 4 , the holder  120  has the central axis (not shown), and a thickness D 1  of the main body  130  along the central axis is less than the thickness D 2  of the tool receiving corner post  140  along the central axis. The tool receiving corner post  140  has at least two first side surfaces  143  and at least two second side surfaces  145 . The first side surfaces  143  and the second side surfaces  145  are rectangular. Each of the first side surfaces  143  has a first adjacent side  143   a  and a first nonadjacent side  143   b . Each of the second side surfaces  145  has a second adjacent side  145   a  and a second nonadjacent side  145   b . Two first side surfaces  143  are paralleled to each other. Each of the second adjacent sides  145   a  on one side of the second side surface  145  adjoins the first adjacent side  143   a , and the second adjacent sides  145   a  on the other side of the second side surfaces  145  approaches to each other to form a square pyramid. Furthermore, two second side surfaces  145  of the tool receiving corner post  140  are abutted against the base  110  along a force central axis (not shown) of the cutting tool holding device  100 . A length T 1  of the first nonadjacent side  143   b  is less than the length T 2  of the second nonadjacent side  145   b . An area of the second side surface  145  is greater than the area of the first side surface  143 , and the second side surface  145  is abutted against the base  110  along the force central axis (not shown) of the cutting tool holding device  100 . Therefore, the greater area of the second side surface  145  can enhance a stability of the engagement between the base  110  and the holder  120 . 
       FIG. 5  is a cross-sectional view of the cutting tool holding device  100  of  FIG. 1 . The thickness D 1  of the main body  130  along the central axis is less than the thickness D 2  of the tool receiving corner post  140  along the central axis. After the holder  120  is mounted on the base  110 , a ratio of the thickness D 1  of the main body  130  to the thickness D 3  of the cutting tool holding device  100  is ⅓. Because the cutting tool holding device  100  of the present disclosure is reduced the thickness of the holder  120  projecting from the base  110  so that the center of gravity of the cutting tool holding device  100  is shifted to the base  110 , a more stable structure in the cutting tool holding device  100 , to avoid a leverage effect and reduce the reaction force. Therefore, the holder  120  does not shake and rupture so easy. 
     According to the foregoing embodiment of the disclosure, the cutting tool holding device  100  has advantages as follows. First, the shape complementation between the angular receiving hole  115  and the tool receiving corner post  140  can avoid a rotation of the holder  120 . Second, the engagement between the engaging portion  135  and the rabbet  113 , the design of the second abutting surface  137  of the main body  130  and the second side surface  145  of the tool receiving corner post  140 , and the fix of the holder  120  on the base  110  by the fastening member  150  can enhance the stability of the engagement between the base  110  and the holder  120  and increase a load value of the base  110  and the load value of the holder  120  for the reaction force. Moreover, the reduced thickness of the main body  130  of the holder  120  can decrease the reaction force generated from a processed material acting on the cutting tool holding device  100 . Therefore, the life span of the base  110  and the holder  120  can be prolonged, and the maintenance cost can be reduced. 
       FIG. 6  is an operating schematic view of the cutting tool holding device  100  shown in  FIG. 1 . In  FIG. 6 , the cutting tool holding device  100  is fixed on a peripheral surface of a machinery  700  that is treated a roughness of the road. The cutting tool holding device  100  is received the cutting tool B, and the machinery  700  is applied to the processed material (such as the road) by the cutting tool B. The cutting tool holding device  100  can avoid the rotation of the holder  120 , reduce the ratio of the thickness of the main body  130  of the holder  120 , and enhance the stability of the engagement between the base  110  and the holder  120 . Therefore, the design of the present disclosure can improve the load value of the base  110  and the load value of the holder  120  for the reaction force. The life span of the base  110  and the holder  120  can be prolonged, and the maintenance cost can be reduced. The components of the cutting tool holding device  100  (such as the base  110  and the holder  120 ) do not need to replace when replacing the cutting tool B, hence the maintenance cost can be further reduced. 
       FIG. 7  is a side view of the holder  220  according to the second embodiment of the present disclosure.  FIG. 8  is a cross-sectional view of the cutting tool holding device  200  according to the second embodiment of the present disclosure. In  FIGS. 7 and 8 , the cutting tool holding device  200  includes the base  210 , the holder  220 , and fastening member  250 . The holder  220  includes the main body  230  and the tool receiving corner post  240  with the position limiting grooves  242 . The main body  230  includes the first abutting portion  232  and the second abutting portion  236 . The first abutting portion  232  has the first abutting surface  233  and the engaging portion  235 , and the second abutting portion  236  has the second abutting surface  237  and the mounting surface  239 . The mounting surface  239  is located on the other side of the second abutting surface  237 , and the mounting surface  239  has the holding hole  239   a  for holding the cutting tool B. The tool receiving corner post  240  extending projects from the main body  230  and is located between the first abutting surface  233  and the second abutting surface  237 . The position of the tool receiving corner post  240  in the second embodiment is closer to the second abutting surface  237  compared to the tool receiving corner post  140  in the first embodiment. Therefore, the tool receiving corner post  240  does not have the second pushing hole, and the remove of the cutting tool B is by the first pushing hole  218  of the base  210  which is communicated with the holding hole  239   a . The rest details of the second embodiment are the same as that shown in the first embodiment, and thus it is not illustrated any further. 
       FIG. 9  is a perspective view of the cutting tool holding device  300  according to the third embodiment of the present disclosure.  FIG. 10  is an exploded view of the cutting tool holding device  300  shown in  FIG. 9 . In  FIGS. 9 and 10 , the cutting tool holding device  300  includes the base  310 , the holder  320 , the fastening member  350 , and the draw bolt member  360 . The holder  320  is mounted on the base  310 , and the fastening member  350  and the draw bolt member  360  are disposed in the base  310 . 
     The base  310  includes the front rake wall  312 , the back rake wall  314 , the positioning hole  316 , and the first pushing hole  318 . The front rake wall  312  is connected to the back rake wall  314 , wherein the front rake wall  312  has the rabbet  313  and the back rake wall  314  has an angular receiving hole  315 . The angular receiving hole  315  has a central axis (not shown), wherein the central axis of the angular receiving hole  315  is paralleled to an extending direction of the rabbet  313 . The positioning hole  316  is penetrated one end of the base  310  and communicated with the angular receiving hole  315 . The positioning hole  316  has the central axis (not shown), wherein the central axis of the positioning hole  316  is perpendicular to an extending direction of the angular receiving hole  315 . The first pushing hole  318  is formed on the other side of the base  310  and communicated with the angular receiving hole  315 . 
     The holder  320  is mounted on the base  310  for receiving the cutting tool B, wherein the holder  320  includes the main body  330  and the tool receiving corner post  340 . 
     The main body  330  includes the first abutting portion  332  and the second abutting portion  336 . The first abutting portion  332  has the first abutting surface  333  and the engaging portion  335 , wherein the first abutting surface  333  is abutted against the front rake wall  312 , and the engaging portion  335  is detachably engaged into the rabbet  313 . The second abutting portion  336  has the second abutting surface  337  and the mounting surface  339 . The second abutting surface  337  is the flat surface and is fitting abutted against the back rake wall  314 . The mounting surface  339  is located on the other side of the second abutting surface  337 , and the mounting surface  339  has a holding hole  339   a  for holding the cutting tool B (as shown in  FIG. 6 ). 
     The tool receiving corner post  340  extending projects from the main body  330  and is correspondingly set into the angular receiving hole  315 . The shape of the angular receiving hole  315  is complementary to the shape of the tool receiving corner post  340 , so that the tool receiving corner post  340  does not move relative to the base  310  after setting into the angular receiving hole  315 . The position limiting groove  342  is formed on the tool receiving corner post  340  corresponded with the positioning hole  316 . The second pushing hole  346  is formed on the tool receiving corner post  340  near the main body  330 , wherein the second pushing hole  346  is communicated with the holding hole  339   a  and the first pushing hole  318  for removing the cutting tool B. 
     The fastening member  350  is movably disposed in the positioning hole  316  and pressed against the position limiting groove  342 , wherein a threaded hole  354  is formed in one end of the fastening member  350 . In this embodiment, the threaded hole  354  is penetrated the fastening member  350  to form a through hole structure. In other embodiment, the threaded hole  354  can be not penetrated the fastening member  350 . The fastening member  350  has n outer surface with a first inclined surface  352 , thus a sectional area of the fastening member  350  gradually changes along the extending direction of the fastening member  350 . Furthermore, the first inclined surface  352  presses the position limiting groove  342  of the tool receiving corner post  340 . 
     The draw bolt member  360  is limitedly disposed in the positioning hole  316 , wherein the draw bolt member  360  has a threading portion  362  and a stair portion  364  connected to the threading portion  362 . The threading portion  362  of the draw bolt member  360  is screwed into the threaded hole  354  of the fastening member  350 , whereby the draw bolt member  360  draws the fastening member  350  moving in the positioning hole to change a pressing extent between the fastening member  350  and the position limiting groove  342 . 
       FIG. 11  is a side view of the holder  320  shown in  FIG. 9 .  FIG. 12  is a partial cross-sectional view of the holder  320  taken along line  12 - 12  of  FIG. 11 . In  FIGS. 11 and 12 , the holder  320  has the central axis (not shown), and the thickness D 1  of the main body  330  along the central axis is less than the thickness D 2  of the tool receiving corner post  340  along the central axis. The tool receiving corner post  340  has at least two first side surfaces  343  and at least two second side surfaces  345 . The first side surfaces  343  and the second side surfaces  345  are rectangular. Each of the first side surfaces  343  has the first adjacent side  343   a  and the first nonadjacent side  343   b . Each of the second side surfaces  345  has the second adjacent side  345   a  and the second nonadjacent side  345   b . Two first side surfaces  343  are paralleled to each other. Each of the second adjacent sides  345   a  on one side of the second side surface  345  adjoins the first adjacent side  343   a , and the second adjacent sides  345   a  on the other side of the second side surfaces  345  approaches to each other to form a square pyramid. Furthermore, two second side surfaces  345  of the tool receiving corner post  340  are abutted against the base  310  along the force central axis (not shown) of the cutting tool holding device  300 . The length T 1  of the first nonadjacent side  343   b  is less than the length T 2  of the second nonadjacent side  345   b . The area of the second side surface  345  is greater than the area of the first side surface  343 , and the second side surface  345  is abutted against the base  310  along the force central axis (not shown) of the cutting tool holding device  300 . Therefore, the greater area of the second side surface  345  can enhance the stability of the engagement between the base  310  and the holder  320 . 
       FIG. 13  is a partial cross-sectional view of the cutting tool holding device  300  taken along line  13 - 13  of  FIG. 9 . The positioning hole  316  of the base  310  has a first narrowed neck  317 . The fastening member  350  is disposed at one end of the first narrowed neck  317 , and the stair portion  364  of the draw bolt member  360  is disposed at the other end of the first narrowed neck  317 . The threading portion  362  of the draw bolt member  360  passes through the first narrowed neck  317  to screw into the threaded hole  354  of the fastening member  350 . A transverse cross-sectional area of the stair portion  364  is greater than the transverse cross-sectional area of the first narrowed neck  317  so that it can avoid the stair portion  364  moving to the other end of the first narrowed neck  317  therein in order to limit a position of the draw bolt member  360 . In addition, the draw bolt member  360  draws the fastening member  350  moving in the positioning hole  316  to change a pressing extent between the fastening member  350  and the position limiting groove  342  by the threading portion  362  screwing into the threaded hole  354 . 
       FIG. 14  is a perspective view of the cutting tool holding device  500  according to the fourth embodiment of the present disclosure.  FIG. 15  is an exploded view of the cutting tool holding device  500  shown in  FIG. 14 . In  FIGS. 14 and 15 , the cutting tool holding device  500  includes the base  510 , the holder  520 , two fastening members  550 , and two draw bolt members  560 . The base  510  includes two positioning holes  516 , and two positioning holes  516  are interval formed on the base  510 . The holder  520  includes the main body  530  and the tool receiving corner post  540  with two position limiting grooves  542 . Two fastening members  550  are respectively disposed in two positioning holes  516 . Each of the fastening members  550  has the threaded hole  554  and the first inclined surface  552 . Two draw bolt members  560  are limitedly disposed in the positioning holes  516  respectively, wherein each of the draw bolt members  560  has the threading portion  562  and the stair portion  564 . Therefore, the stability of the engagement between the base  510  and the holder  520  can be improved by increasing a number of the fastening member  550  the draw bolt member  560 , and the position limiting groove  542 . The rest details of the fourth embodiment are the same as that shown in the third embodiment, and thus it is not illustrated any further. 
     According to the foregoing embodiment of the disclosure, the shape complementation between the angular receiving hole and the tool receiving corner post can avoid the rotation of the holder. The engagement between the engaging portion and the rabbet can fix the holder on the base. The draw bolt member draws the fastening member moving in the positioning hole to change the pressing extent between the base and the holder so that it can effectively avoid the engagement between the base and the holder being loose. Thus the present disclosure can enhance the stability of the engagement between the base and the holder and increase a load value of the base and the load value of the holder for the reaction force. The life span of the base and the holder can be prolonged, and the maintenance cost can be reduced. In addition, a user only need to spin the draw bolt member for precisely adjusting the pressing extent among the fastening member, the base, and the holder because the threading portion of the draw bolt member is screwed into the threaded hole of the fastening member. Therefore the present disclosure further has the advantages of easy operation and high accuracy of adjustment. 
     Although the present disclosure has been described in considerable detail with reference to certain embodiments thereof, other embodiments are possible. Therefore, the spirit and scope of the appended claims should not be limited to the description of the embodiments contained herein. 
     It will be apparent to those skilled in the art that various modifications and variations can be made to the structure of the present disclosure without departing from the scope or spirit of the disclosure. In view of the foregoing, it is intended that the present disclosure cover modifications and variations of this disclosure provided they fall within the scope of the following claims.