Patent Publication Number: US-2017350246-A1

Title: Cutting tool holding device

Description:
BACKGROUND 
     Technical Field 
     The present disclosure relates to a holding device. More particularly, the present disclosure relates to a cutting tool holding device for a road planer. 
     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 or 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. 
     Furthermore, the scrap of the road surface during the working process of the road planer will be accumulated in front of the cutting tool (e.g. the scrap is dirt, gravel, concrete or asphalt). Due to the cutting tool must be forced to continue working action against the road surface, but the accumulated scrap in front of the cutting tool will produce interference and resistance, and therefore the road planer will reduce the drilling efficiency and waste energy. In addition, the road planer must always be carried out each of the cutting tools cleaning and checking, and the work of the road planer must often wait to clean up not only wasting the human cost, also wasting of time. Therefore, the foregoing problems are the road planer industry&#39;s improvement goals, 
     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 has a front rake wall, a back rake wall, and a positioning hole. The front rake wall has an embedding portion, and the back rake wall is connected to the front rake wall. The back rake wall has an arc receiving hole and the positioning hole is communicated with the arc receiving hole. The holder is mounted on the base for receiving the cutting tool, and the holder has a main body, an arc receiving post, and a guiding block. The main body has a first abutting portion and a second abutting portion, and the first abutting portion has a first abutting surface and an embedding concave. The first abutting surface is abutted against the front rake wall, and the embedding portion is detachably embedded into the embedding concave. The second abutting portion has a second abutting surface, and the second abutting surface is abutted against the back rake wall. The arc receiving post is extending projecting from the main body, and the arc receiving post is correspondingly set into the arc receiving hole. A position limiting groove is formed on the arc receiving post corresponding to the positioning hole, and the guiding block is projected corresponding to the cutting tool. 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, and a fastening member. The base has a front rake wall, a back rake wall, and a positioning hole. The front rake wall has an embedding portion, and the back rake wall is connected to the front rake wall. The back rake wall has an arc receiving hole and the positioning hole is communicated with the arc receiving hole. The arc receiving hole has two abutted surfaces. The holder is mounted on the base for receiving the cutting tool, and the holder has a main body, an arc receiving post, and a guiding block. The main body has a first abutting portion and a second abutting portion. The first abutting portion has a first abutting surface and an embedding concave, and the first abutting surface is abutted against the front rake wall, and the embedding portion is detachably embedded into the embedding concave. The second abutting portion has a second abutting surface, and the second abutting surface is abutted against the back rake watt The arc receiving post is extending projecting from the main body. The arc receiving post is correspondingly set into the arc receiving hole, and a position limiting groove is formed on the arc receiving post corresponding to the positioning hole. The arc receiving post has at least two side surfaces and the two side surfaces are abutted against the two abutted surfaces, and the guiding block is projected corresponding to the cutting tool. The fastening member is fastened in the positioning hole and pressed against 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 combination view of a cutting tool holding device according to the first embodiment of the present disclosure. 
         FIG. 2  is perspective 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 front side view of the holder of  FIG. 1 . 
         FIG. 5  is a rear side view of the holder of  FIG. 1 . 
         FIG. 6  is a perspective combination view of the cutting tool holding device shown in  FIG. 1 . 
         FIG. 7  is an operating schematic view of a road planer. 
         FIG. 8  is an operating schematic view of a guiding block of the road planer of  FIG. 7 . 
     
    
    
     DETAILED DESCRIPTION 
       FIG. 1  is a perspective combination view of a cutting tool holding device  100  according to the first embodiment of the present disclosure.  FIG. 2  is a perspective exploded view of the cutting tool holding device  100  shown in  FIG. 1 .  FIG. 3  is a side view of a holder  120  shown in  FIG. 1 ,  FIG. 4  is a front side view of the holder  120  of  FIG. 1 , and  FIG. 5  is a rear side view of the holder  120  of  FIG. 1 .  FIG. 6  is a perspective combination view of the cutting tool holding device  100  shown in  FIG. 1 . In  FIGS. 1, 2, and 3  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 faint rake wall  112  is connected to the back rake wall  114 , wherein the front rake wall  112  has an embedding portion  113  that is a triangular block, and the front rake wall  112  has an arc receiving hole  115 . The arc receiving hole  115  has a cross section shape being heart-shaped, and the arc receiving hole  115  has two abutted surfaces  1151  in lower edge. The arc receiving hole  115  has a central axis (not shown), wherein the central axis of the arc receiving hole  115  is paralleled to an extending direction of the embedding portion  113 . The positioning hole  116  is penetrated one end of the base  110  and communicated with the arc 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 arc receiving hole  115 . The first pushing hole  118  is formed on the other side of the base  110  and communicated with the arc receiving hole  115 . The base  110  has two centering inside surfaces  1101 , and each of the two centering inside surfaces  1101  is inward incline. 
     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 an arc receiving corner post  140 . 
     The main body  130  includes a first abutting portion  132 , a second abutting portion  136 , and a guiding block  131 . The first abutting portion  132  has a first abutting surface  133  and an embedding concave  135 , wherein the first abutting surface  133  is abutted against the front rake wall  112 , and the embedding portion  113  is detachably engaged into the embedding concave  135 . 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 ). Wherein, the holder  120  has two centering outside surfaces  1201  that each is outward incline, and the two centering outside surfaces  1201  are abutted against the two centering inside surfaces  1101  of the base  110 . The two centering outside surfaces  1201  are fitting abutted against the two centering inside surfaces  1101  for a center correction effect. In addition, the guiding block  131  is projected corresponding to the cutting tool B. The guiding block  131  has a plurality of guide slant surfaces  1311 , and the guide slant surfaces  1311  are gradually reducing heights from an inside of the guiding block  131  to an outside of the guiding block  131 . The guiding block  131  is a triangular prism-shaped. 
     The arc receiving post  140  extending projects from the main body  130  and is correspondingly set into the arc receiving hole  115 . Each of the arc receiving post  140  and the arc receiving hole  115  has a cross section shape being heart-shaped. The shape of the a receiving hole  115  is complementary to the shape of the arc receiving corner post  140  so that the arc receiving post  140  does not move relative to the base  110  after setting into the arc receiving hole  115 . A position limiting groove  142  is formed on the arc receiving post  140  corresponded with the positioning hole  116 . The arc receiving post  140  has at least two side surfaces  1401  and the two side surfaces  1401  are abutted against the two abutted surfaces  1151 . In addition, the arc receiving post  140  has an arc lead angle  1402  of an end, and an operator can conveniently and quickly make the arc receiving post  140  into the arc receiving hole  115 . 
     The fastening member  150  is built up in combination with a latch  151  and a bolt  152 . The fastening member  150  is fastened in the positioning hole  116  of the base  110  and pressed against the position limiting groove  142  of the arc receiving corner post  140 . 
       FIG. 7  is an operating schematic view of a road planer A, and  FIG. 8  is an operating schematic view of a guiding block of the road planer A of  FIG. 7 . In  FIGS. 7 and 8 , the center of gravity of the cutting tool holding device  100  can move back to near the base  110 , because of each of the arc receiving post  140  and the arc receiving hole  115  has a cross section shape being heart-shaped, and the two side surfaces  1401  of the arc receiving post  140  are abutted against the two abutted surfaces  1151  of the arc receiving hole  115 . In addition, the two side surfaces  1401  and the two abutted surfaces  1151  can increase the contact area, avoid the leverage effect, and reduce reaction force thereof. 
     Therefore, the arc receiving post  140  cooperates with the arc receiving hole  115  for avoiding the holder  120  turned. The base  110 , the holder  120 , and the fastening member  150  are stably assembled, because of the embedding concave  135  is assembled together with the embedding portion  113  and the two centering outside surfaces  1201  are abutted against the two centering inside surfaces  1101 . The base  110  and the holder  120  have a higher loading capacity, longer using life, and less maintenance costs. 
     According to  FIG. 8 , the guiding block  131  is projected corresponding to the cutting tool B. The guiding block  131  has a plurality of guide slant surfaces  1311 , and the guide slant surfaces  1311  are gradually reducing heights from an inside of the guiding block  131  to an outside of the guiding block  131 . The guiding block  131  is a triangular prism-shaped. When a plurality of the cutting tool holding devices  100  are installed on the road planer A, the scrap C of the road surface will be accumulated in front of the cutting tool B (e.g. the scrap is dirt, gravel, concrete or asphalt). Therefore, the scrap C will be guided and discharged through the guide slant surfaces  1311  of the guiding block  131 , and the cutting tool B will not reduce the drilling efficiency and waste energy. In addition, the less maintenance costs can be reduced by the guiding block  131  of the holder  120 . 
     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 t he 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.