TW201819073A - External deburring tool - Google Patents

Abstract

This invention relates to an external deburring tool, which includes a chamfering head and a shank adapter detachably inserted in an end of the chamfering head. The chamfering head includes a hollow cone body and a stem. The cone body defines a plurality of chip removal grooves therein. The cone body further includes a blade and a guiding slope at opposite sides of each of the chip removal grooves. The stem has one end formed integrally with the cone body and the other end defining a receptacle. On the other hand, the shank adapter has at opposite ends a first connecting portion and a second connecting portion. The first connecting portion of the shank adapter is detachably engaged in the receptacle of the stem of the chamfering head, and the second connecting portion is configured to engage with a driving tool.

Description

External chamfer trimming tool

The present invention relates to a chamfering hand tool, and more particularly to an outer chamfer trimming tool, which has a dismounting adapter bar.

In general, after the pipe is cut, the pipe port is prone to sharp irregular burrs, and even the pipe port is inclined, which makes the pipe member difficult to firmly engage with other connecting components. Therefore, the hand tool manufacturer has developed a pipe trimming tool. Used to refurbish the burrs and irregular slanting ports of the pipe fittings.

A conventional pipe trimming tool generally includes a one-piece cutting head and a guide rod integrally formed as shown in U.S. Patent Publication No. 2016/0082517. The user can insert one end of the guide rod into an electric or pneumatic tool, and operate the tool so that the cutting head cuts and trims the port of the pipe member to form an outer chamfer.

The invention provides an outer chamfering trimming tool which is easy to manufacture and has excellent cutting ability. In addition, since the fitting has detachable characteristics, the cutting head can be selected according to the needs of the electric/pneumatic/hand tool. Posts to externally chamfer the pipe or cylinder without being limited to specific electric/pneumatic/hand tools.

Specifically, the outer chamfer trimming tool of the present invention mainly comprises a cutting head and an adapter rod. The cutting head has an empty cone and a main cutting edge and a pair of cutting edges formed on the inner side of the hollow cone. The hollow cone has an inner tapered surface and an outer tapered surface, and the hollow cone is formed on the peripheral wall thereof. The at least one chip hole extending through the inner and outer tapered surfaces, the hole wall of the chip removing hole includes a first guiding inclined surface and a second guiding inclined surface, the first guiding inclined surface adjoining one of the inner tapered surfaces a region and an obtuse angle with the first region, the second guiding slope abutting a second region of the inner tapered surface, and the second region is milled to form a concave step, the first step of the concave step and the second portion The guide bevel clip has an acute angle, and the first step wall of the concave step abuts a third region of the inner tapered surface, wherein the main cutting edge is formed between the second lead inclined surface and the stepped surface of the concave step, and the A minor cutting edge is formed between the stepped wall of the concave step and the third region of the inner tapered surface. In addition, one end of the adapter rod is connected to the hollow cone, and the other end is coupled to a driving tool.

Preferably, the number of the chip holes of the hollow cone is at least three, and each of the chip holes has an inner opening and an outer opening in the inner and outer tapered surfaces of the hollow cone. The extending direction of the long axis of the opening outside the chip evacuation hole meets the axis of the hollow cone, and each of the chip evacuation holes is laterally inclined from the outer opening toward the one-hour direction of the hollow cone to Inside opening.

Preferably, the cutting head further has a handle portion, one end of the handle portion is integrally connected to the hollow circular body body, and an end surface of the other end axially defines a insertion groove; and two ends of the adapter rod are respectively formed a first joint and a second joint are detachably engaged with the insertion groove of the handle of the cutting head, and the second joint is used for coupling with the driving tool.

Preferably, the insertion groove of the shank of the cutting head includes a straight section and a multi-angle section from the inside to the outside, and the first joint of the adapter includes an adjacent cylindrical section and a corner section, respectively Corresponding to a straight section and a multi-angle section of the insertion groove of the shank of the cutting head; and a straight section of the insertion groove of the shank of the cutting head and a cylindrical section of the first joint of the adapter A static fit is used, and a clearance fit is used between the multi-angle section of the insertion groove of the shank of the cutting head and the corner post section of the first joint of the adapter.

Preferably, the insertion groove of the shank of the cutting head includes a straight section and a multi-angle section from the inside to the outside, and the first joint of the adapter includes an adjacent cylindrical section and a corner section, respectively Corresponding to a straight section and a multi-angle section of the insertion groove of the shank of the cutting head; and the shank of the cutting head defines a positioning slot on the peripheral wall thereof, and communicates with the insertion slot, and the adapter rod The connector further has a positioning bead and is elastically disposed on one side of the corner post to correspondingly engage when the first joint of the adapter rod is engaged with the insertion slot of the handle of the cutting head The positioning of the shank of the cutting head is located in the card slot.

Preferably, the insertion groove of the shank of the cutting head has a polygonal cross section, and the first joint of the adapter rod has a polygonal cylinder corresponding to the insertion groove of the shank of the cutting head. The shank of the cutting head defines a positioning slot on the peripheral wall thereof to communicate with the insertion slot, and the first joint of the adapter rod further has a positioning bead, and is elastically disposed on one side of the polygonal cylinder When the first joint of the adapter rod is engaged with the insertion slot of the shank of the cutting head, the corresponding joint is engaged in the positioning slot of the shank of the cutting head.

Viewed from another perspective, the outer chamfer trimming tool of the present invention includes a cutting head and an adapter. The cutting head has an empty cone and a handle, wherein the hollow cone is formed with a plurality of chip evacuation holes on a peripheral wall thereof, and two opposite sides of each chip hole respectively form a blade edge and a guide slope, and the handle portion One end is integrally connected to the hollow cone, and the end surface of the other end is axially defined with a socket. A first joint and a second joint are respectively formed at two ends of the adapter rod, wherein the first joint is detachably engaged with the insertion groove of the handle of the cutting head, and the second joint is used for the second joint Used in conjunction with a drive tool.

In one embodiment, the insertion groove of the shank of the cutting head includes a straight tube section and a polygonal section from the inside to the outside, and the first joint of the adapter rod includes an adjacent cylindrical section and a corner section Corresponding to the straight section and the multi-angle section of the insertion groove of the shank of the cutting head; and the straight section of the insertion groove of the shank of the cutting head and the cylindrical section of the first joint of the adapter A static fit is used, and a clearance fit is used between the multi-angle section of the insertion groove of the shank of the cutting head and the corner post section of the first joint of the adapter.

In another embodiment, the insertion slot of the handle of the cutting head includes a straight section and a polygonal section from the inside to the outside, and the first joint of the adapter includes an adjacent cylindrical section and a corner post. a segment corresponding to a straight section and a multi-angle section of the insertion groove of the shank of the cutting head; and the shank of the cutting head defines a positioning slot on the peripheral wall thereof to communicate with the insertion slot, and the transfer The first joint of the rod further has a positioning bead which is elastically disposed on one side of the corner post to correspondingly engage the first joint of the adaptor rod in the insertion groove of the handle of the cutting head, correspondingly Engaged into the positioning slot of the handle of the cutting head.

In still another embodiment, the insertion groove of the shank of the cutting head has a polygonal cross section, and the first joint of the adapter rod has a polygonal cylinder corresponding to the shank of the cutting head. The shank of the cutting head defines a positioning slot on the peripheral wall thereof to communicate with the insertion slot, and the first joint of the adapter rod further has a positioning bead and is elastically disposed on the polygonal cylinder One side of the adapter rod is correspondingly engaged in the positioning slot of the shank of the cutting head when the first joint of the adapter rod is engaged with the insertion slot of the shank of the cutting head.

The first through nine figures show a first preferred embodiment of the outer chamfer trimming tool 100 of the present invention. First, as shown in the first figure, the outer chamfer trimming tool 100 mainly includes a cutting head 1 and an adapter rod 2 that is inserted into the tail end of the cutting head 1.

As shown in the second figure, the cutting head 1 has an empty cone 11, a shank portion 12 extending integrally from the trailing end of the hollow cone 11, and a plurality of blade portions 13 formed inside the hollow cone 11. The hollow cone 11 has an inner tapered surface 111 and an outer tapered surface 112. One end of the handle portion 12 is integrally connected to the tail end of the hollow cone body 11, and the end surface of the other end is axially defined with a socket groove 120 (third diagram) for the adapter rod 2 to be inserted. The insertion slot 120 extends through the shank 12 and communicates with the internal space of the hollow cone 11 .

Referring to Figures 3 to 5, the hollow cone 11 of the cutting head 1 further defines a plurality of chip evacuation holes 110 extending through the inner and outer tapered surfaces 111, 112. The blade portions 13 are respectively adjacent to the chip evacuation holes 110, and each blade portion 13 includes a main cutting edge 131 and a minor cutting edge 132. More specifically, as shown in FIG. 4A, each of the chip evacuation holes 110 has a first guide bevel 113 and a second bevel 114. The first guiding slope 113 abuts a first region 111a of the inner tapered surface 111 and has an obtuse angle with the first region 111a. The second guiding inclined surface 114 abuts the second region 111b of the inner tapered surface 111. It should be noted that the second region 111b is milled to form a concave step 14, the first-order surface 141 of the concave step 14 and the second guiding inclined surface 114 are at an acute angle, and the first-order wall 142 of the concave step 14 is adjacent to the One of the inner tapered surfaces 111 is a third region 111c. The main cutting edge 131 is formed between the second guiding inclined surface 114 and the step surface 141 of the concave step 14, and the minor cutting edge 132 is formed on the step wall 142 and the inner tapered surface of the concave step 14. Between the third regions 111c of 111. The double-edge design of the primary and secondary cutting edges 131, 132 makes the trimming quality of the pipe more perfect.

In the preferred embodiment, the hollow cone 11 has four chip evacuation holes 110, and each of the chip evacuation holes 110 has an elongated shape on the inner and outer tapered surfaces 111 and 112 of the hollow cone 11 respectively. An inner opening 110a and an outer opening 110b are as shown in the sixth or seventh figure. Each of the chip evacuation holes 110 is laterally inclined from the outer opening 110b toward a (cis) hand direction of the hollow cone 11 to the inner opening 110a to increase the force of the pipe trimming. However, it is worth noting that, as shown in the sixth figure, the extending directions of the long axes of the openings 110b outside the chip evacuation holes 110 meet the axis of the hollow cone 11, that is, the outer openings 110b are not Designed with a spiral or an hour hand. Such a design makes the chip evacuation holes 110 of the hollow cone 11 easier to be accurately machined.

Referring to the second figure, the two ends of the adapter bar 2 respectively form a first joint 21 and a second joint 22, wherein the first joint 21 is detachably engaged with the handle 12 of the cutting head 1. The sockets 120 are coupled to a drive tool (not shown), such as an electric/pneumatic/hand tool. In this embodiment, the second joint 22 of the adapter rod 2 is a hexagonal joint for inserting into a set of holes of the driving tool. In addition, a circumferential ring groove 220 is formed on the circumferential side of the hexagonal second joint 22 for the driving tool to be fastened.

Referring to the eighth figure, the insertion slot 120 of the handle 12 of the cutting head 1 includes a straight section 121 and a polygonal section 122 from the inside to the outside, and the first joint 21 of the adapter rod 2 includes an adjacent one. The cylindrical section 211 and the corner post section 212 respectively correspond to the straight section 121 and the polygonal section 122 of the insertion groove 120 of the shank 12 of the cutting head 1. It should be noted that a static fit (or precision fit) is used between the straight section 121 of the insertion slot 120 of the shank 12 of the cutting head 1 and the cylindrical section 211 of the first joint 21 of the adapter rod 2, The multi-angle section 122 of the insertion slot 120 of the shank 12 of the cutting head 1 and the corner post section 212 of the first joint 21 of the adapter rod 2 are gap-fitted. Therefore, the adapter bar 2 can be inserted into the insertion slot 120 of the handle 12 of the cutting head 1 on the one hand, and on the other hand, there is still a margin to facilitate the insertion and removal of the adapter bar 2 . In the insertion slot 120.

The eighth and ninth drawings show front and rear schematic views of the chamfering and trimming operation of a workpiece (for example, a pipe or a screw) by the outer chamfering trimming tool 100 of the present invention. As shown, the outer chamfer trimming tool 100 can form an outer chamfer 31 on the end edge of the workpiece 3 after the advanced and rotating cutting process. In addition, since the hollow cone 11 of the cutting head 1 has a flare-like shape, workpieces of different calibers can be received.

10 and 11 are views showing a second preferred embodiment of the outer chamfering trimming tool 200 of the present invention. The structure and function of the cutting head 1 in this embodiment are the same as those of the first preferred embodiment. 1 is identical. The difference between the two embodiments is that the second joint 22a of the adapter rod 2a is a four-channel joint of the SDS specification for inserting into a socket of a driving tool (not shown).

The twelfth and thirteenth figures show a third preferred embodiment of the outer chamfering trimming tool 300 of the present invention. The structure and function of the cutting head 1a in this embodiment are the same as those in the first preferred embodiment. The head 1 is substantially identical in that the shank 12a of the cutting head 1a defines a positioning slot 123 in the peripheral wall thereof, and communicates with the insertion slot 120. The first joint 21 of the adapter rod 2 further has a positioning bead 213. It is elastically protruded from one side of the corner post 212 by the top of the inner spring 214 to engage the first joint 21a of the adapter rod 2b with the insert 12a of the cutting head 1a. When the groove 120 is engaged, it is correspondingly engaged in the positioning groove 123 of the shank portion 12a of the cutting head 1a, as shown in Fig. 13. In this way, the adapter bar 2b can be more firmly inserted into the insertion slot 120 of the handle portion 12a of the cutting head 1a, thereby increasing the service life.

The fourteenth and fifteenth drawings show a fourth preferred embodiment of the outer chamfering trimming tool 400 of the present invention. The structure and function of the cutting head 1b in this embodiment are the same as those in the third preferred embodiment. The head 1a is substantially identical, and the difference between the two embodiments is that the adapter bar 2c does not have a cylindrical section and is completely replaced by the corner section 212. Therefore, in the embodiment, the cross section of the insertion groove 120a of the shank portion 12b of the cutting head 1b is completely polygonal, and the first joint 21b of the adapter rod 2c is completely a polygonal cylinder, correspondingly engaged. In the insertion groove 120a of the shank portion 12b of the cutting head 1b. In addition, the shank portion 12b of the cutting head 1b defines a positioning slot 123 on the peripheral wall thereof to communicate with the insertion slot 120a, and the first joint 21b of the adapter rod 2c further has a positioning bead 213 which is subjected to an internal portion. The top of the spring 214 is elastically protruded from one side of the polygonal cylinder to engage the first joint 21b of the adapter rod 2c with the insertion groove 120a of the shank 12b of the cutting head 1b. Correspondingly, it is inserted into the positioning slot 123 of the shank portion 12b of the cutting head 1b as shown in Fig. 15.

With the above arrangement, the outer chamfer trimming tool of the present invention utilizes the double-edge design to make the trimming quality of the pipe fittings more perfect. Further, the outer chamfer trimming tool of the present invention employs the chip hole 110 which is easy to process, but still maintains a good cutting ability. In addition, the outer chamfer trimming tool of the present invention has detachable characteristics due to its accessories, so that the cutting head can be selected according to the needs of the electric/pneumatic/hand tool to match the adapter rod to the pipe or column. The body performs an outer chamfer trimming operation without being limited to a specific electric/pneumatic/hand tool.

In any event, anyone can obtain sufficient teaching from the description of the above examples, and it is understood that the present invention is indeed different from the prior art, and is industrially usable and progressive. It is the invention that has indeed met the patent requirements and has filed an application in accordance with the law.

100, 200, 300, 400‧‧‧ External chamfer trimming tools
1, 1a, 1b‧‧‧ cutting head
11‧‧‧empty cone
110‧‧‧chip hole
Opening within 110a‧‧
110b‧‧‧Outside opening
111‧‧‧Inner cone
111a‧‧‧First area
111b‧‧‧Second area
111c‧‧‧ third area
112‧‧‧ outer cone
113‧‧‧First guiding bevel
114‧‧‧Second guide bevel
12, 12a, 12b‧‧ ‧ handle
120, 120a‧‧‧ docking slot
121‧‧‧ Straight section
122‧‧‧Multi-angle
123‧‧‧ positioning card slot
13‧‧‧Knife
131‧‧‧Main cutting edge
132‧‧‧Sub cutting edge
14‧‧‧ concave steps
141‧‧ ‧ step
142‧‧‧
2, 2a, 2b, 2c‧‧‧ adapter rod
21, 21a, 21b‧‧‧ first joint
211‧‧‧ cylindrical section
212‧‧‧ corner section
213‧‧‧ positioning beads
214‧‧‧ Spring
22, 22a‧‧‧second joint
220‧‧‧ positioning ring groove
3‧‧‧Workpiece
31‧‧‧Outer chamfer

The first figure is a schematic perspective view of a first preferred embodiment of the outer chamfering trimming tool of the present invention. The second figure is a three-dimensional exploded view of the round chamfer trimming tool of the first figure. The third figure is an enlarged view of one of the angles of the cutting head of the round chamfering trimming tool of the second figure. The fourth figure is an enlarged schematic view of another angle of the cutting head of the second figure. Figure 4A is a partial cross-sectional view of the cutting head of the fourth figure. Figure 5 is a cross-sectional view of the cutting head of the third figure. The sixth drawing is a rear view of the cutting head of the third figure. The seventh drawing is a front view of the cutting head of the third figure. Figure 8 is a partial cross-sectional view showing the situation before the round chamfering trimming tool of the first drawing is processed before a pipe; the ninth drawing is similar to the eighth figure, showing the outer chamfering trimming tool The case after the pipe fitting is processed; The tenth drawing is a schematic perspective view of the second preferred embodiment of the outer chamfering trimming tool of the present invention. The eleventh figure is a three-dimensional exploded view of the round chamfer trimming tool of the tenth figure. Figure 12 is a perspective exploded view of a third preferred embodiment of the outer chamfer trimming tool of the present invention. The thirteenth figure is a schematic cross-sectional view of the outer chamfering trimming tool of the twelfth figure. Figure 14 is a perspective view showing the structure of a fourth preferred embodiment of the outer chamfering trimming tool of the present invention. The fifteenth figure is a sectional view of the outer chamfering trimming tool of the fourteenth figure.

Claims (10)

An outer chamfering trimming tool comprising: a cutting head having an empty cone and a major cutting edge formed on the inner side of the hollow cone and a pair of cutting edges, the hollow cone having an inner tapered surface and an outer a tapered surface, the hollow cone further forming at least one chip hole penetrating through the inner and outer tapered surfaces, wherein the hole wall of the chip removing hole comprises a first guiding inclined surface and a second guiding inclined surface a guiding slope abutting a first region of the inner tapered surface and having an obtuse angle with the first region, the second guiding inclined surface adjoining a second region of the inner tapered surface, and the second region is milled to form a concave step a first-order surface of the concave step and an acute angle of the second guiding inclined surface, and a first-order wall of the concave step abuts a third region of the inner tapered surface, wherein the main cutting edge is formed on the second guiding inclined surface Between the stepped surface of the concave step, the auxiliary cutting edge is formed between the stepped wall of the concave step and the third area of the inner tapered surface; and an adapter rod having one end connected to the hollow cone, And the other end is used to combine a driving tool. The outer chamfer trimming tool according to claim 1, wherein the number of the chip holes of the empty cone is at least three, and each of the chip holes is inside and outside the cone. Each of the faces has an inner opening and an outer opening, and the extending direction of the long axis of the opening outside the chip discharging hole meets the axis of the hollow cone, and each chip opening is from the outer opening Tilting laterally to the inner opening toward the one-hour direction of the hollow cone. The outer chamfering trimming tool according to claim 1, wherein the cutting head further has a handle, one end of the handle is integrally connected to the hollow cone, and the end surface of the other end is axially defined. a first slot and a second connector are respectively formed on the two ends of the adapter bar, and the first connector is detachably engaged with the insertion slot of the handle of the cutting head, and the A second joint is used in conjunction with the drive tool. The outer chamfering trimming tool according to claim 3, wherein the insertion groove of the shank of the cutting head comprises a straight section and a multi-angle section from the inside to the outside, and the adapter rod a joint includes an adjacent cylindrical section and a corner post section respectively corresponding to the straight section and the multi-angle section of the insertion groove of the shank of the cutting head; and the straight section of the insertion groove of the shank of the cutting head A static fit is used between the cylindrical section of the first joint of the adapter rod, and the multi-angle section of the insertion groove of the handle of the cutting head and the corner post section of the first joint of the adapter rod are used Gap fit. The outer chamfering trimming tool according to claim 3, wherein the insertion groove of the shank of the cutting head comprises a straight section and a multi-angle section from the inside to the outside, and the adapter rod a joint includes an adjacent cylindrical section and a corner post section respectively corresponding to a straight section and a multi-angle section of the insertion groove of the shank of the cutting head; and the shank of the cutting head defines a positioning card on a peripheral wall thereof a slot that communicates with the insertion slot, and the first joint of the adapter rod further has a positioning bead elastically disposed on one side of the corner post to engage the first joint of the adapter rod When the socket of the head is inserted into the slot, it is correspondingly engaged in the positioning slot of the handle of the cutting head. The outer chamfering trimming tool according to claim 3, wherein the insertion groove of the cutting head has a polygonal cross section, and the first joint of the adapter has a polygonal cylinder Correspondingly engaged in the insertion groove of the shank of the cutting head; and the shank of the cutting head defines a positioning slot on the peripheral wall thereof, and communicates with the insertion slot, and the first joint of the adapter rod has a positioning bead is elastically disposed on one side of the polygonal cylinder to correspondingly engage the cutting head when the first joint of the adapter rod is engaged with the insertion slot of the handle of the cutting head The positioning of the handle is in the card slot. An outer chamfer trimming tool comprises: a cutting head having an empty cone and a handle, wherein the hollow cone is formed with a plurality of chip evacuation holes on a peripheral wall thereof, and two opposite sides of each chip hole respectively Forming a cutting edge and a guiding inclined surface, wherein one end of the handle is integrally connected to the hollow circular body, and an end surface of the other end is axially defined with a insertion groove; and an adapter rod has a first end formed at each end thereof And a second joint, wherein the first joint is detachably engaged with the insertion groove of the handle of the cutting head, and the second joint is used for coupling with a driving tool. The outer chamfering trimming tool according to claim 7, wherein the insertion groove of the shank of the cutting head comprises a straight section and a multi-angle section from the inside to the outside, and the adapter rod a joint includes an adjacent cylindrical section and a corner post section respectively corresponding to the straight section and the multi-angle section of the insertion groove of the shank of the cutting head; and the straight section of the insertion groove of the shank of the cutting head A static fit is used between the cylindrical section of the first joint of the adapter rod, and the multi-angle section of the insertion groove of the handle of the cutting head and the corner post section of the first joint of the adapter rod are used Gap fit. The outer chamfering trimming tool according to claim 7, wherein the insertion groove of the shank of the cutting head comprises a straight section and a multi-angle section from the inside to the outside, and the adapter rod a joint includes an adjacent cylindrical section and a corner post section respectively corresponding to a straight section and a multi-angle section of the insertion groove of the shank of the cutting head; and the shank of the cutting head defines a positioning card on a peripheral wall thereof a slot that communicates with the insertion slot, and the first joint of the adapter rod further has a positioning bead elastically disposed on one side of the corner post to engage the first joint of the adapter rod When the socket of the head is inserted into the slot, it is correspondingly engaged in the positioning slot of the handle of the cutting head. The outer chamfering trimming tool according to claim 7, wherein the cutting groove of the cutting head has a polygonal cross section, and the first joint of the connecting rod has a polygonal cylinder. Correspondingly engaged in the insertion groove of the shank of the cutting head; and the shank of the cutting head defines a positioning slot on the peripheral wall thereof, and communicates with the insertion slot, and the first joint of the adapter rod has a positioning bead is elastically disposed on one side of the polygonal cylinder to correspondingly engage the cutting head when the first joint of the adapter rod is engaged with the insertion slot of the handle of the cutting head The positioning of the handle is in the card slot.