Reverse deburring chamfering tool

Abstract

The utility model provides a reverse deburring and chamfering tool which can be used for deburring and chamfering even if burrs are in a narrow or closed space. Comprising a handheld rod which is hollow; the core rod can be arranged in the handheld rod in a manner of reciprocating relative to the handheld rod; the working blade is arranged at one side end of the core rod through a connecting piece, the working blade can be folded or unfolded along with the reciprocating motion of the core rod relative to the handheld rod, and a positioning part is further formed between the core rod and the handheld rod. And the positioning part can fix the core rod at a specified position relative to the handheld rod.

Description

TECHNICAL FIELD

[0001] The utility model relates to a reverse deburring and chamfering tool. BACKGROUND

[0002] In the prior art, when deburring and chamfering the burr formed on the edge of a hole in a component by using a deburring and chamfering tool such as a reverse drill, the reverse drill is first placed on the side of the component (hereinafter referred to as the "back side") on which no burr is formed, and the air drill is placed on the side of the component (hereinafter referred to as the "front side") on which the burr is formed, and then the reverse drill is inserted through the hole and connected to the air drill on the front side of the component, and then the air drill is started to drive the reverse drill to remove the burr on the edge of the hole and to chamfer it.

[0003] In the above deburring and chamfering process, the reverse drill and the air drill need to be placed on the two sides of the component in advance, thus requiring a certain space, and the reverse drill itself has a certain length. Therefore, it is not possible to deburr and chamfer in a narrow or closed space such as a I-shaped component or a closed corner component. SUMMARY

[0004] The utility model is completed in view of the above technical problem, and aims to provide a reverse deburring and chamfering tool, which can be placed on the side (i.e. the back side) of the component opposite to the side on which the burr is formed together with the air drill to perform reverse deburring and chamfering, and can perform deburring and chamfering even in a narrow or closed space.

[0005] To achieve the above object, the utility model provides a reverse deburring and chamfering tool, which comprises a hand-held rod, a core rod and a working blade. The hand-held rod is hollow. The core rod is arranged in the hand-held rod in a reciprocating manner relative to the hand-held rod. The working blade is arranged on one end of the core rod via a connecting piece. The working blade is arranged on one end of the hand-held rod in a manner that it can be folded or unfolded with the reciprocating movement of the core rod relative to the hand-held rod. A positioning part is formed between the core rod and the hand-held rod, and the positioning part can fix the core rod at a specified position relative to the hand-held rod.

[0006] According to the above structure, the working blade is arranged on one end of the hand-held rod in a manner that it can be folded or unfolded with the reciprocating movement of the core rod relative to the hand-held rod, and a positioning part is formed between the core rod and the hand-held rod, and the positioning part can fix the core rod at a specified position relative to the hand-held rod. Therefore, the working blade can be placed on the back side on which the burr is formed in advance, and placed on the same side as the air drill. Even if the burr is in a narrow or closed space, the working blade can be inserted into the narrow or closed space in a folded state through the hole, and the burr on the edge of the hole can be removed by rotating the working blade in an unfolded state.

[0007] The reverse deburring and chamfering tool of the second aspect of the present application is based on the reverse deburring and chamfering tool of the first aspect of the present application, wherein the other side end of the core rod is mounted to the hand-held rod via a compression spring, one end of the working blade is connected to one side end of the core rod and can rotate within a range from parallel to the axial direction of the core rod to a prescribed angle of inclination relative to the axial direction of the core rod, and the connecting member includes: a core rod end cap that is cylindrical and is fitted to one side end of the core rod in a manner movable relative to the core rod; and a blade support umbrella that is pivotally connected at one end to the working blade and at the other end to an outer peripheral surface of the core rod end cap, and can be folded or unfolded with the working blade in accordance with the reciprocating movement of the core rod relative to the hand-held rod.

[0008] According to the above structure, since the other side end of the core rod is mounted to the hand-held rod via a compression spring, the reciprocating movement of the core rod relative to the hand-held rod can be achieved.

[0009] The reverse deburring and chamfering tool of the third aspect of the present application is based on the reverse deburring and chamfering tool of the second aspect of the present application, wherein a drum-shaped head having a diameter greater than the inner diameter of the hand-held rod is formed at the other side end of the core rod, a spring abutting portion bulging radially outward is formed at a prescribed distance from the other side end of the core rod, and the compression spring is fitted between the drum-shaped head and the spring abutting portion of the core rod.

[0010] According to the above structure, by providing a spring abutting portion between the drum-shaped head and the spring abutting portion of the core rod and fitting the compression spring to the spring abutting portion, the reciprocating movement of the core rod relative to the hand-held rod can be achieved by a simple structure.

[0011] The reverse deburring and chamfering tool of the fourth aspect of the present application is based on the reverse deburring and chamfering tool of the second aspect of the present application, wherein a plurality of working blades are formed, a plurality of connecting members are correspondingly formed, and a plurality of blade storage portions capable of storing the plurality of working blades are formed at one side end of the hand-held rod.

[0012] According to the above structure, since the plurality of working blades are connected to the mandrel via the connecting members, and a plurality of blade storage portions capable of storing the plurality of working blades are formed at the one side end of the hand-held rod, the plurality of working blades can be stored in the hand-held rod while being folded.

[0013] The reverse deburring and chamfering tool of the fifth aspect of the present application is the reverse deburring and chamfering tool of the fourth aspect of the present application, wherein the outer long side of the working blade is a cutting edge with a rounded corner.

[0014] According to the above structure, since the outer long side of the working blade is a cutting edge with a rounded corner, chamfering with a rounded corner can be smoothly performed.

[0015] The reverse deburring and chamfering tool of the sixth aspect of the present application is the reverse deburring and chamfering tool of any one of the first to fifth aspects of the present application, wherein the positioning portion includes: a positioning protrusion formed on the outer peripheral surface of the mandrel and protruding to the radial outer side; and a positioning hole formed at a position on the inner peripheral surface of the hand-held rod corresponding to the positioning protrusion and formed to a size capable of allowing the positioning protrusion to be inserted.

[0016] According to the above structure, since the positioning portion includes the positioning protrusion formed on the outer peripheral surface of the mandrel and protruding to the radial outer side and the positioning hole formed at a position on the inner peripheral surface of the hand-held rod corresponding to the positioning protrusion and formed to a size capable of allowing the positioning protrusion to be inserted, the mandrel can be easily positioned with respect to the hand-held rod by relatively moving the mandrel with respect to the hand-held rod, and the positioning structure is simple and the positioning process is simple.

[0017] The reverse deburring and chamfering tool of the seventh aspect of the present application is the reverse deburring and chamfering tool of the sixth aspect of the present application, wherein the positioning protrusion is formed in a plurality.

[0018] According to the above structure, since the positioning protrusion is formed in a plurality, the mandrel can be positioned at a plurality of positions with respect to the hand-held rod.

[0019] The reverse deburring and chamfering tool of the eighth aspect of the present application is the reverse deburring and chamfering tool of any one of the first to fifth aspects of the present application, wherein the positioning portion includes: a positioning protrusion formed on the inner peripheral surface of the hand-held rod and protruding to the radial inner side; and a positioning hole formed at a position on the outer peripheral surface of the mandrel corresponding to the positioning protrusion and formed to a size capable of allowing the positioning protrusion to be inserted.

[0020] According to the above structure, since the positioning portion includes the positioning protrusion formed on the inner circumferential surface of the hand-held rod and protruding to the radial inner side and the positioning hole formed on the outer circumferential surface of the core rod at a position corresponding to the positioning protrusion and formed to a size allowing the positioning protrusion to be inserted, the core rod can be easily positioned relative to the hand-held rod by only relatively moving the core rod relative to the hand-held rod, the positioning structure is simple, and the positioning process is simple.

[0021] The reverse deburring and chamfering tool of the ninth aspect of the present application is based on the reverse deburring and chamfering tool of the eighth aspect of the present application, and the positioning protrusion is formed with a plurality of positioning protrusions.

[0022] According to the above structure, since the positioning protrusion is formed with a plurality of positioning protrusions, the core rod can be positioned at a plurality of positions relative to the hand-held rod.

[0023] The reverse deburring and chamfering tool of the tenth aspect of the present application is based on the reverse deburring and chamfering tool of the seventh aspect or the ninth aspect of the present application, and the positioning protrusion is formed in a cylindrical shape, and the positioning hole is formed in a circular hole.

[0024] According to the above structure, by forming the positioning portion with the positioning protrusion in a cylindrical shape and the positioning hole in a circular hole, the positioning portion can be simple in structure, and the positioning operation is simple. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the drawings required to be used in the embodiments will be briefly introduced as follows. Obviously, the drawings described in the following are only some embodiments of the present application, and other drawings can also be obtained according to these drawings without creative labor for those skilled in the art.

[0026] Figure 1 is an exploded view of the reverse deburring and chamfering tool of the first embodiment of the present application.

[0027] Figure 2 is a sectional view of the reverse deburring and chamfering tool of the first embodiment of the present application when the working blade is folded.

[0028] Figure 3 is a sectional view of the reverse deburring and chamfering tool of the first embodiment of the present application when the working blade is unfolded.

[0029] Figures 4(A) to 4(D) is a step diagram of the deburring and chamfering process realized by the reverse deburring and chamfering tool of the first embodiment of the present application.

[0030] (SYMBOL DESCRIPTION)

[0031] 100 reverse deburring and chamfering tool

[0032] 1 hand-held rod;

[0033] 11 first positioning hole;

[0034] 12 second positioning hole;

[0035] 13 third positioning hole;

[0036] 14 first blade receiving hole;

[0037] 15 second blade receiving hole;

[0038] 16 third blade receiving hole;

[0039] 2 mandrel;

[0040] 21 mandrel body;

[0041] 211 compression spring abutting portion;

[0042] 212 positioning protrusion;

[0043] 22 mandrel drum head;

[0044] 3 compression spring;

[0045] 4 working blade;

[0046] 41 first working blade;

[0047] 42 second working blade;

[0048] 43 third working blade;

[0049] 5 connecting piece;

[0050] 51 fixed shaft;

[0051] 52 first connecting piece;

[0052] 53 blade support umbrella rib;

[0053] 54 mandrel end cap;

[0054] 55 second connecting piece;

[0055] 6 air drill;

[0056] 7 workpiece;

[0057] 71 drilled hole. DETAILED DESCRIPTION

[0058] Hereinafter, various embodiments of the reverse deburring and chamfering tool 100 of the present application and modified examples thereof will be described with reference to the accompanying drawings. Figure 1is an exploded view of the reverse deburring and chamfering tool of the present application. Figure 2 is a cross-sectional view of the reverse deburring and chamfering tool of the present application when the working blade is folded. Figure 3 is a cross-sectional view of the reverse deburring and chamfering tool of the present application when the working blade is unfolded. Figures 4(A) to 4(D) is a step diagram showing the deburring and chamfering process achieved by the reverse deburring and chamfering tool of the first embodiment of the present application. Hereinafter, the axial direction of the mandrel 2 is set as the CL direction, the side of the mandrel 2 in the CL direction closer to the working blade 4 is the CL1 side, i.e., the "one-side end of the mandrel", and the side closer to the mandrel drum head 22 is the CL2 side, i.e., the "other-side end of the mandrel".

[0059] (First Embodiment)

[0060] (Overall structure of the reverse deburring and chamfering tool 100)

[0061] As Figure 1As shown, the reverse deburring and chamfering tool 100 of the first embodiment of this utility model includes: a handheld rod 1, which is a hollow cylindrical shape, with a first positioning hole 11, a second positioning hole 12 and a third positioning hole 13 arranged on its peripheral wall from the CL2 side to the CL1 side, and a first blade receiving hole 14, a second blade receiving hole 15 and a third blade receiving hole 16 recessed towards the CL2 side at the end of the CL1 side; and a mandrel 2, which includes a cylindrical mandrel body 21 and a mandrel drum-shaped part formed at the CL2 side end of the mandrel body 21 with a diameter larger than the inner diameter of the handheld rod 1. The head 22 has a compression spring abutment 211 that bulges radially outward at a predetermined distance from the drum-shaped head 22 of the mandrel. A spring mounting portion for mounting the compression spring 3 is formed between the compression spring abutment 211 and the drum-shaped head 22 of the mandrel. Furthermore, a positioning protrusion 212 that protrudes radially outward is formed on the outer peripheral surface of the mandrel body 21, closer to CL1 than the compression spring abutment 211. The positioning protrusion 212 is cylindrical. The working blade 4 includes a first working blade 41, a second working blade 42, and a third working blade 43, each of which has rounded corners. A rectangular blade with a cutting edge on its outer edge, and its inner side connected to the CL1 side end of the mandrel 2 via a fixed shaft 51, rotatable within a range from parallel to the axial direction CL to radially outward tilting 100° relative to the axial direction CL, and aligned circumferentially with the first blade receiving hole 14, the second blade receiving hole 15, and the third blade receiving hole 16; and a connecting member 5, which connects the working blade 4 to the mandrel 2, including the aforementioned fixed shaft 51, the first connecting member 52, the blade support rib 53, the mandrel end cap 54, and the second connecting member 55, and the first working blade 41 to the third working blade. 43 is rotatable within a range of 100° radially outward relative to the axis CL via a fixed shaft 51. The mandrel end cap 54 is fitted onto the CL1 side end of the mandrel 2 in a manner that allows it to reciprocate relative to the mandrel 2 in the axis CL. One end of the blade support rib 53 is connected to the working blade 4 at approximately the middle via a first connector 52 in a manner that allows it to rotate relative to the working blade 4. The other end is connected to the mandrel end cap 54 via a second connector 55 in a manner that allows it to rotate within a range of 100° radially outward relative to the axis CL.

[0062] In this embodiment, the positioning part that fixes the position of the core rod 2 relative to the handheld lever 1 is, for example... Figure 3 The detailed figure C shows the above-mentioned positioning protrusion 212 and the above-mentioned first positioning hole 11 to third positioning hole 13, the first positioning hole 11 to third positioning hole 13 being formed to a size that allows the positioning protrusion 212 to be inserted.

[0063] In the reverse deburring and chamfering tool 100 constructed as described above, the mandrel 2 is mounted in the handle 1 via a compression spring 3 in a manner that allows it to reciprocate along the axial direction CL. As the mandrel 2 reciprocates relative to the handle 1 along the axial direction CL, the positioning protrusion 212 can be sequentially inserted into the first positioning hole 11, the second positioning hole 12, and the third positioning hole 13. If the angle of each working blade 4 relative to the axial direction CL is set as θ, then when the positioning protrusion 212 is inserted into the first positioning hole 11, the angle θ of each working blade 4 tilting radially outward relative to the axial direction CL is 60°; when the positioning protrusion 212 is inserted into the second positioning hole 12, the angle θ of each working blade 4 tilting radially outward relative to the axial direction CL is 82°; when the positioning protrusion 212 is inserted into the third positioning hole 13, the angle θ of each working blade 4 tilting radially outward relative to the axial direction CL is 100°; after the positioning protrusion 212 is released from the three positioning holes 11, 12, and 13, the mandrel 2 moves towards the CL2 side under the restoring force of the compression spring 3, and the first working blade 41, the second working blade 42, and the third working blade 43 are respectively stored in the first blade storage hole 14, the second blade storage hole 15, and the third blade storage hole 16 in a manner parallel to the axial direction.

[0064] (Deburring and chamfering process performed by the reverse deburring and chamfering tool 100 of this embodiment)

[0065] The following is for reference Figures 4(A) to 4(D) The deburring and chamfering process implemented by the reverse deburring and chamfering tool 100 of this embodiment will be described in the illustration.

[0066] When deburring and chamfering the burrs remaining on the edge of the drilled hole 71 in the workpiece 7 using the reverse deburring and chamfering tool 100 constructed as described above, although... Figures 4(A) to 4(D) The burrs are not clearly shown in the figures, but they are formed on the upper edge of the drill hole 71 in these figures. First, the reverse deburring and chamfering tool 100 and the air drill 6 are placed on the back side of the drill hole (i.e., the side opposite to the side where the burrs are formed). Figures 4(A) to 4(D) (The middle is the lower side), and connect the lower end of the mandrel 2 in the diagram to the air drill 6, then, as shown Figure 2 As shown, the positioning protrusion 212 of the mandrel 2 is disengaged from the first positioning hole 11 to the third positioning hole 13, and under the restoring force of the compression spring 3, the mandrel 2 is... Figure 1 , 2moves to a position where the first to third working blades 41 to 43 are respectively housed in the first to third blade housing holes 14 to 16, and becomes a state shown in FIG. 4(A). Next, as shown in FIG. 4(B), the working blades 4 of the reverse deburring and chamfering tool 100 in the above state are inserted from the back surface (i.e., the lower side surface in the drawing) of the drill hole 71 to the front surface (i.e., the upper side surface in the drawing) of the drill hole 71. Then, as shown in FIG. 4(C), the first to third working blades 41 to 43 are respectively inclined by 60° to the radial outer side with respect to the axial direction CL, and the working blades 4 at this time are in an umbrella shape, and become a state shown in FIG. 4(C). In this state, the umbrella-shaped working blades 4 are not in contact with the burrs of the edges of the drill hole. Next, the core bar 2 is pulled until the umbrella-shaped working blades 4 come into contact with the edges (i.e., the upper edges shown in FIG. 4(D)) of the drill hole 71 on which the burrs are formed, the core bar drum head 22 of the core bar 2 in FIG. 4(D) is connected to the air drill 6, and the air drill 6 is driven to rotate the working blades 4 to remove the burrs and perform chamfering on the upper edges of the drill hole 71. Figure 3 As shown in FIG. 3(B), the first to third working blades 41 to 43 are respectively inclined by 60° to the radial outer side with respect to the axial direction CL, and the working blades 4 at this time are in an umbrella shape, and become a state shown in FIG. 3(C). In this state, the umbrella-shaped working blades 4 are not in contact with the burrs of the edges of the drill hole. Next, the core bar 2 is pulled until the umbrella-shaped working blades 4 come into contact with the edges (i.e., the upper edges shown in FIG. 3(D)) of the drill hole 71 on which the burrs are formed, the core bar drum head 22 of the core bar 2 in FIG. 3(D) is connected to the air drill 6, and the air drill 6 is driven to rotate the working blades 4 to remove the burrs and perform chamfering on the upper edges of the drill hole 71. Figure 3 As shown in FIG. 3(B), the first to third working blades 41 to 43 are respectively inclined by 60° to the radial outer side with respect to the axial direction CL, and the working blades 4 at this time are in an umbrella shape, and become a state shown in FIG. 3(C). In this state, the umbrella-shaped working blades 4 are not in contact with the burrs of the edges of the drill hole. Next, the core bar 2 is pulled until the umbrella-shaped working blades 4 come into contact with the edges (i.e., the upper edges shown in FIG. 3(D)) of the drill hole 71 on which the burrs are formed, the core bar drum head 22 of the core bar 2 in FIG. 3(D) is connected to the air drill 6, and the air drill 6 is driven to rotate the working blades 4 to remove the burrs and perform chamfering on the upper edges of the drill hole 71.

[0067] As described above, since the reverse deburring and chamfering tool 100 and the air drill 6 can be placed on the same side of the drill hole to be deburred, when it is necessary to remove the burrs in a narrow space or a closed space, it is only necessary to place both the air drill 6 and the reverse deburring and chamfering tool 100 outside the narrow space or the closed space to smoothly perform deburring and chamfering.

[0068] (Modified example of the first embodiment)

[0069] Hereinafter, with reference to the drawings, a first embodiment of the reverse deburring and chamfering tool 100 according to the present application and a deburring and chamfering process performed by the reverse deburring and chamfering tool 100 will be described. Figures 1 to 4(D) Hereinafter, with reference to the drawings, a first embodiment of the reverse deburring and chamfering tool 100 according to the present application and a deburring and chamfering process performed by the reverse deburring and chamfering tool 100 will be described.

[0070] In the above first embodiment, as the positioning portions, the cylindrical positioning protrusions 212 protruding to the radial outer side from the outer peripheral surface of the core bar main body 21 and the first to third positioning holes 11 to 13 formed in the hand-held rod 1 are included, but the present application is not limited thereto, and as the positioning portions, cylindrical positioning protrusions protruding to the radial inner side from the inner peripheral surface of the hand-held rod 1 and first to third positioning holes formed in the core bar main body of the core bar can also be included.

[0071] According to the present modified example, by the positioning portions as described above, as in the above first embodiment, the core bar can be fixed to a specific position with respect to the hand-held rod, i.e., the working blades can be fixed to a fixed shape.

[0072] Further, according to the present modification, by the reverse deburring chamfer tool as described above, as with the first embodiment described above, since the reverse deburring chamfer tool and the air drill can be placed on the same side of the hole to be deburred, when deburring is required in a narrow space or a closed space, it is only necessary to place the air drill and the reverse deburring chamfer tool on the outside of the narrow space or the closed space, and deburring chamfering can be smoothly performed.

[0073] The above describes each embodiment of the present application and the modification thereof in detail and completely in combination with Figures 1 to 4(D) The above describes each embodiment of the present application and the modification thereof in detail and completely in combination with

[0074] In the above embodiment and the modification thereof, the working blade is formed in three, but the present application is not limited thereto, and can be formed in other numbers.

[0075] In the above embodiment and the modification thereof, three positioning holes are formed as the positioning portions, but the present application is not limited thereto, and can be formed in other numbers.

[0076] In the above embodiment and the modification thereof, three inclination angles of the working blade with respect to the axial direction CL are provided corresponding to the first to third positioning holes, but the present application is not limited thereto, and can be provided in other numbers.

[0077] In the above embodiment and the modification thereof, the core rod is connected to the air drill to rotate the core rod, but the present application is not limited thereto, and the core rod can be directly held by hand to directly rotate the core rod.

Claims

1. A reverse deburring and chamfering tool comprising: a hand-held rod which is hollow; a core rod which is disposed in the hand-held rod so as to be reciprocally movable with respect to the hand-held rod; and a working blade which is disposed at one side end of the core rod via a connecting member, characterized in that the working blade is capable of being folded or unfolded with the reciprocating movement of the core rod with respect to the hand-held rod, a positioning portion is further formed between the core rod and the hand-held rod, and the positioning portion is capable of fixing the core rod at a prescribed position with respect to the hand-held rod.

2. The reverse deburring and chamfering tool according to claim 1, characterized in that the other side end of the core rod is mounted to the hand-held rod via a compression spring, one end of the working blade is connected to the one side end of the core rod and is rotatable within a range from parallel to the axial direction of the core rod to a prescribed angle of inclination with respect to the axial direction of the core rod, the connecting member includes: a core rod end cap which is cylindrical and is fitted to the one side end of the core rod so as to be movable with respect to the core rod; and a blade support rib which is constructed so as to be pivotally connected at one end to the working blade and at the other end to the outer peripheral surface of the core rod end cap, and is capable of being folded or unfolded with the working blade with the reciprocating movement of the core rod with respect to the hand-held rod.

3. The reverse deburring and chamfering tool according to claim 2, characterized in that a knob is formed at the other side end of the core rod, the diameter of the knob being greater than the inner diameter of the hand-held rod, a spring abutting portion which bulges to the radially outer side is formed at a prescribed distance from the other side end of the core rod, the compression spring is fitted between the knob and the spring abutting portion of the core rod.

4. The reverse deburring and chamfering tool according to claim 2, characterized in that a plurality of the working blades are formed, and a plurality of the connecting members are correspondingly formed, a plurality of blade receiving portions which are capable of receiving the plurality of working blades are formed at one side end of the hand-held rod.

5. The reverse deburring and chamfering tool according to claim 4, characterized in that the outer side long edge of the working blade is formed as a rounded cutting edge.

6. The reverse deburring and chamfering tool according to any one of claims 1 to 5, characterized in that the positioning portion includes: a positioning protrusion which is formed on the outer peripheral surface of the core rod and protrudes to the radially outer side; and a positioning hole which is formed at a position on the inner peripheral surface of the hand-held rod corresponding to the positioning protrusion and is formed to a size such that the positioning protrusion is capable of being fitted therein.

7. The reverse deburring and chamfering tool according to claim 6, characterized in that a plurality of the positioning protrusions are formed.

8. The reverse deburring and chamfering tool according to any one of claims 1 to 5, characterized in that the positioning portion includes: a positioning protrusion which is formed on the inner peripheral surface of the hand-held rod and protrudes to the radially inner side; and a positioning hole which is formed at a position on the outer peripheral surface of the core rod corresponding to the positioning protrusion and is formed to a size such that the positioning protrusion is capable of being fitted therein.

9. The reverse deburring and chamfering tool according to claim 8, characterized in that ​ The positioning portion protrusions are a plurality of.

10. The reverse deburring chamfer tool according to claim 7 or 9, wherein The positioning protrusions are formed in a cylindrical shape. The positioning holes are formed in a circular shape.

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