Drill device

Abstract

To provide a drill device capable of forming a connection hole with hardly causing splitting failure in wooden shaft member for a connection structure where the connection hole is filled with filler after inserting shaft core material into the connection hole formed in the wooden shaft member.SOLUTION: A drill device 55 is to form a hole widening part in a wooden shaft member having a hole linearly extending. The drill device 55 comprises: a drill body 60; a shaft 63 having a base end part connected with a rotational shaft part 62 of the drill body 60 through a joint 66 so as to extend along a rotational shaft 64 of the rotational shaft part 62; a rotational plate 87 configured to be rotatable around the rotational shaft 64 as a center and having at an offset position a shaft hole 91 into which the shaft 63 penetrates to rotate such that a tip part of the shaft 63 moves around the rotational shaft 64 with the joint 66 as a base point; and a cutting tool 67 attached on the tip part of the shaft 63 to cut a side surface of the hole.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present invention relates to a drilling device for forming grooves on the side of a linearly extending hole formed in a wooden shaft. [Background technology]

[0002] A known connection structure for connecting a wooden shaft to another component involves inserting a steel core material into a connection hole formed in the wooden shaft and then filling the gap between the wooden shaft and the core material with a filler material. Patent Document 1 also discloses such a connection structure, in which a connection hole is formed by a core material insertion section into which a core material (rod-shaped material) is inserted and a connection hole widening section (expanding filling groove) provided in the core material insertion section. The connection hole widening sections are semicircular in the shaft cross section, which is a cross section along the axial direction of the wooden shaft, and are provided at predetermined intervals in the axial direction of the wooden shaft. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2018-123628 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the structure described in Patent Document 1, when a pushing force that pushes the shaft connecting member into the shaft core member insertion portion or a pulling force that pulls the shaft connecting member out of the shaft core member insertion portion is applied, the resistance to the force tends to be concentrated in the wooden shaft material, making it prone to splitting fracture. Therefore, there is a need for a drilling device that can form a connection hole that can realize a connection structure that is less likely to cause splitting fracture in the wooden shaft material. [Means for solving the problem]

[0005] A drilling device that solves the above problem forms a hole widening portion in a wooden shaft material having a linearly extending hole. The drilling device includes a drill body, a shaft having a base end connected to a rotary shaft portion of the drill body via a joint and extending along the rotary axis of the rotary shaft portion, a rotating plate configured to be rotatable about the rotary shaft and having a shaft hole through which the shaft passes, and a cutting tool attached to the tip of the shaft and used to cut the side of the hole. The joint is configured to transmit torque from the rotary shaft portion to the shaft and to bend the shaft relative to the rotary shaft, and the rotating plate has the shaft hole located eccentrically from the rotary shaft, so that the tip of the shaft moves around the rotary shaft as the rotating plate rotates. [Effects of the Invention]

[0006] According to the present invention, it is possible to form connection holes which are capable of reducing the shear forces acting on the filler at the boundary between the inner packet part and the wider part. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 1 is a perspective view showing a schematic configuration of a state in which a shaft connecting member is connected to a wooden shaft member in which a connecting hole is formed using an embodiment of a drilling device, together with other members. [Figure 2] FIG. 2(a) is a view showing a state in which a shaft core member is inserted into a connection hole in a cross section along the axial direction, and FIG. 2(b) is an enlarged view of the part surrounded by line 2b. [Figure 3] FIG. 3(a) is a view showing a state in which the filler has been formed in an axial cross section along the axial direction, and FIG. 3(b) is an enlarged view of the part surrounded by line 3b. [Figure 4] FIG. 4 is a partial perspective view showing the shaft connecting member. [Figure 5] FIG. 5 is a cross-sectional view showing a process of connecting a first wooden shaft member and a second wooden shaft member. [Figure 6] FIG. 6 is a perspective view showing a schematic configuration of an embodiment of a drilling device. [Figure 7]FIG. 7(a) is a side view showing a schematic configuration of one embodiment of a drilling device, and FIG. 7(b) is a top view showing a schematic configuration of one embodiment of a drilling device. [Figure 8] FIG. 8 is a diagram showing the front structure of the rotating plate. [Figure 9] FIG. 9 is a diagram schematically showing how a shaft moves around a rotation axis. [Figure 10] Figure 10(a) is a diagram showing a state in which a cutting tool is placed at a position where a connection hole widening portion is to be formed, Figure 10(b) is a diagram showing a state in which a connection hole widening portion is formed, and Figure 10(c) is a diagram showing a state in which the cutting tool has been moved to a position where another connection hole widening portion is to be formed. DETAILED DESCRIPTION OF THE INVENTION

[0008] An embodiment of a drilling device will be described with reference to Figures 1 to 10. First, a connection structure using a connection hole having a connection hole widening portion formed by a drilling device will be described with reference to Figures 1 to 5.

[0009] As shown in Figure 1, the connecting structure 10 connects a wooden shaft 11 and another member 12 in the axial direction with a shaft connecting member 13. The wooden shaft 11 is a part of a member that constitutes a building, such as a pillar or beam. The other member 12 is a part of a member that constitutes a building, such as a pillar, beam, or joint. The other member 12 may be made of wood or precast material.

[0010] A connection hole 15 is formed in the wooden shaft 11. The connection hole 15 is a blind hole that extends in the axial direction and has an opening at the connection surface 11a, which is one end face in the axial direction. A core material 16 that constitutes the shaft connection member 13 is inserted into the connection hole 15. The "axial direction" refers to the direction in which the core material 16 extends. The core material 16 protrudes in the axial direction from the connection surface 11a. The wooden shaft 11 is connected to another member 12 using the protruding portion of the core material 16. The core material 16 can be made of a material that is stronger than the wooden shaft 11, such as a deformed steel bar, a fully threaded bolt, or glass fiber bar.

[0011] Filler 17 is formed in connecting hole 15 of wooden shaft 11 to integrate wooden shaft 11 and core material 16. Filler 17 is a hardened fluid filler material. The filler material is, for example, a cement-based material such as non-shrink mortar. The wooden shaft 11 integrated with core material 16 by filler 17 is called wooden shaft 50 with shaft connector.

[0012] It is preferable that a communication hole 18 that communicates with the connection hole 15 is formed in the wooden shaft 11. The communication hole 18 has an opening in the side surface 11b of the wooden shaft 11. The communication hole 18 is formed so that its entire area overlaps with the connection hole 15 when viewed from the side surface 11b. The communication hole 18 communicates with the connection hole 15 at its deepest part. The communication hole 18 is a hole that is used when injecting the filler material that forms the filler 17 into the connection hole 15.

[0013] (Connection hole) 2(a), the connection hole 15 has a core material insertion portion 21 and a connection hole widening portion 22. The connection hole 15 is a hole whose outer shape in the width direction, which is a plane direction perpendicular to the axial direction, is a circular hole.

[0014] The core insertion portion 21 is a portion that opens into the connection surface 11a and extends linearly from the connection surface 11a along the axial direction. The core insertion portion 21 is formed using a tool such as a drill. The deepest portion of the core insertion portion 21 is connected to the above-mentioned communication hole 18.

[0015] The connection hole widened portions 22 are portions that are larger in the width direction than the core material insertion portion 21. The connection hole widened portions 22 are grooves formed on the side surfaces of the core material insertion portion 21. The connection hole widened portions 22 are provided at predetermined intervals in the axial direction. The connection hole widened portions 22 are formed using a special drill after the core material insertion portion 21 is formed. In Figure 2, the formation interval of the connection hole widened portions 22 is shown larger than the length of the connection hole widened portions 22 in the axial direction. With this configuration, the filler 17 can be formed with a small amount of filler material. On the other hand, the formation interval of the connection hole widened portions 22 may be smaller than the length of the connection hole widened portions 22 in the axial direction. With this configuration, a larger number of connection hole widened portions 22 can be formed.

[0016] Incidentally, when the core material 16 is a deformed rebar with a nominal diameter of 29, the diameter of the core material insertion portion 21 is about 45 mm, and the maximum diameter of the connection hole widening portion 22 is about 60 mm (diameter of the core material insertion portion 21 + 15 mm). In addition, the spacing of the connection hole widening portions 22 in the axial direction is preferably about 15 mm.

[0017] As shown in FIG. 2(b), the connection hole widening portion 22 is wedge-shaped in an axial cross section, which is a cross section along the axial direction, gradually approaching the side of the core material insertion portion 21 toward the opposite side of the connection surface 11a.

[0018] The connection hole widening portion 22 has an inclined surface 25 and a pull-out side end surface 26. The inclined surface 25 is a surface that is further away from the side surface of the core material insertion portion 21 as it approaches the connection surface 11a. In an axial cross section, which is a cross section along the axial direction, the inclined surface 25 is formed at an acute angle θ1 with respect to the side surface of the core material insertion portion 21. The angle θ1 is preferably about 30°.

[0019] The extraction-side end surface 26 is a surface connecting the end of the inclined surface 25 on the connection surface 11a side and the side surface of the core material insertion portion 21. At the connection end of the extraction-side end surface 26 with the core material insertion portion 21 in the shaft cross section, the angle θ2 with respect to the side surface of the core material insertion portion 21 is an angle that is equal to or greater than the complement angle to angle θ1 (= 90° - angle θ1). The angle θ2 is preferably close to 90°, and is preferably equal to or greater than 80°. The angle θ2 may also be a slightly obtuse angle. The extraction-side end surface 26 may be formed so as to extend linearly outward from the side surface of the core material insertion portion 21 in the shaft cross section, or may be formed in an arc shape that juts out toward the connection surface 11a side.

[0020] (Method of manufacturing wooden shafts with shaft connectors) An example of a method for manufacturing the wooden shaft member 50 with a shaft connector will be described. First, the connecting hole 15 and the communication hole 18 are formed in the wooden shaft 11, and then the shaft core material 16 is inserted into the connecting hole 15 (see FIG. 2(a)).

[0021] Thereafter, as shown in FIG. 3(a), the filler material is injected through the communication hole 18. The filler material is injected until outflow of the filler material is confirmed from the opening of the connection hole 15 in the connection surface 11a. When the filler material hardens, a filler 17 having an encapsulated portion 27 and an expanded portion 28 is formed in the connection hole 15. The encapsulated portion 27 is a portion formed in the core material insertion portion 21 that encapsulates the core material 16. The expanded portion 28 is a portion formed in the connection hole expanded portion 22 that has a larger diameter than the encapsulated portion 27. In the axial direction, the direction in which the core material 16 is pulled out of the connection hole 15 is called the pulling direction (upward in FIG. 3(a)), and the direction in which the core material 16 is pushed into the connection hole 15 is called the pushing direction (downward in FIG. 3(a)). In an axial cross section, which is a cross section along the axial direction, the expanded portion 28 is formed in a wedge shape that narrows toward the back side of the connection hole 15, i.e., toward the pushing direction. In this way, the wooden shaft 11 and the core material 16 are integrated with the filler material 17, thereby producing a wooden shaft 50 with a shaft connector.

[0022] (widening section) As shown in FIG. 3(b), the widening portion 28 has a widening surface 34 and a narrowing surface 35. The widening surface 34 is attached to the pull-out side end surface 26 of the connection hole widening portion 22. The widening surface 34 has an end surface angle, which is the angle at the end of the connection end with the inner case portion 27 in the shaft cross section, at the pull-out direction side, of the angle θ2. The widening portion 28 resists the pulling force that pulls the shaft connecting member 13 out of the wooden shaft 11 with the widening surface 34. The narrowing surface 35 is attached to the inclined surface 25 of the connection hole widening portion 22. The narrowing surface 35 extends from the outer peripheral end of the widening surface 34 toward the pushing direction and is obliquely oriented toward the inner case portion 27 in the shaft cross section. The narrowing surface 35 has an inclination angle, which is the angle at the end of the pushing direction side, of the shaft cross section, of the narrowing surface 35, which is the angle at the end of the pushing direction side, of the shaft cross section, of the angle θ1. A partial perspective view of such a shaft connecting member 13 is shown in FIG. 4.

[0023] (Method of connecting wooden shafts) Referring to Fig. 5, an example of a connection method for connecting a first wooden shaft, which is a wooden shaft 11, to a second wooden shaft, which is another member 12, with a shaft connecting member 13 will be described. The second wooden shaft has the same configuration as the wooden shaft 11 at the connection portion. Therefore, the same reference numerals as those for the wooden shaft 11 are used for the second wooden shaft for the portions with the same configuration. In Fig. 5, the reference numerals on the right side relate to the first wooden shaft, and the reference numerals on the left side relate to the second wooden shaft.

[0024] First, the shaft connecting member 13 is formed in the first wooden shaft member 11A, and the connecting hole 15 is formed in the second wooden shaft member 11B. The connecting hole 15 of the second wooden shaft member 11B has a communication hole 18 on the connecting surface 11a side and a communication hole 37 (see FIG. 5) that communicates with the deepest part of the shaft core member insertion portion 21.

[0025] Next, as shown in Figure 5, the first wooden shaft material 11A and the second wooden shaft material 11B are aligned with the connecting surface 11a of the first wooden shaft material 11A facing the connecting surface 11a of the second wooden shaft material 11B, and the protruding portion of the core material 16 is inserted into the connecting hole 15 of the second wooden shaft material 11B.

[0026] Then, after the connecting surfaces 11a are brought into contact with each other, the filler material is filled through the communication holes 18 of the second wooden shaft 11B, as indicated by the dark dots. At this time, air inside the connection holes 15 of the second wooden shaft 11B is discharged through the communication holes 37. When the filler material hardens in the connection holes 15 of the second wooden shaft 11B, a filler material 17 is formed in the second wooden shaft 11B, and the first wooden shaft 11A and the second wooden shaft 11B are connected by the shaft connecting material 13.

[0027] (Method of forming connection holes) The method for forming a connection hole in a wooden shaft is described below. The method for forming the connection hole includes an insertion section forming step in which a shaft core material insertion section 21, which is a linear hole extending in the axial direction, is formed using a conventional drilling device, and an enlarged section forming step in which a connection hole enlarged section 22 is formed using a drilling device described below.

[0028] The drilling device will be described with reference to Figures 6 to 9. The following description will primarily refer to Figure 6, but will also refer to Figures 7(a), 7(b), 8 and 9 as needed. As shown in Figure 6, the drilling device 55 includes a drill body 60, a cutting position adjustment mechanism 70, and a shaft support mechanism 85.

[0029] (Drill body) The drill body 60 is fixed to the drill base 61. The drill body 60 has a rotating shaft portion 62 and a shaft 63. The rotating shaft portion 62 rotates around a rotating shaft 64 as a central axis when a drive source (not shown) built into the drill body 60 is driven. The drill body 60 may be either an electric or hydraulic type as long as it rotates the rotating shaft portion 62 around the rotating shaft 64 as a central axis. The shaft 63 extends along the rotating shaft 64. A vibration prevention portion 65 fixed to the drill base 61 prevents the rotating shaft portion 62 from vibrating around the rotating shaft 64 during rotation. The vibration prevention portion 65 is, for example, a plate-shaped member having a hole through which the rotating shaft portion 62 is inserted. The base end of the shaft 63 is connected to the rotating shaft portion 62 via a joint 66. The joint 66 is, for example, a ball joint, and is configured to transmit the torque of the rotation axis portion 62 of the drill body 60 to the shaft 63 and to bend the shaft 63 relative to the rotation axis 64. A cutting tool 67 is detachably attached to the tip of the shaft 63. The cutting tool 67 has a cone-like shape that tapers toward the tip of the shaft 63. In the following, the direction along the rotation axis 64 is referred to as the X direction (axial direction), and the direction perpendicular to the X direction in top view is referred to as the Y direction (lateral direction).

[0030] (Cutting position adjustment mechanism) The cutting position adjustment mechanism 70 is a mechanism that adjusts the position of the cutting tool 67 inside the shaft core material insertion portion 21. The cutting position adjustment mechanism 70 has a rail base 71, a main rail 72, a rack gear 73, a pinion gear 74, and an operating handle 75.

[0031] The rail base 71 extends in the X direction below the drill base 61. The main rail 72 is fixed to the rail base 71. The main rail 72 extends in the X direction between the rail base 71 and the drill base 61. The main rail 72 is connected to the drill base 61 via a slider 76. That is, the drill base 61 is supported by the main rail 72 so as to be movable along the X direction. The drill base 61 is configured to be fixable to the main rail 72 by a fixture (not shown) or the like.

[0032] The rack gear 73 extends in the X direction beside the rail base 71. The rack gear 73 is fixed to the rail base 71 via a bracket 77. The pinion gear 74 meshes with the rack gear 73 and is connected to a handle shaft portion 78 of the operating handle 75.

[0033] The operating handle 75 has a handle shaft 78 supported by a handle support 79. The handle support 79 is fixed to the drill base 61. The handle support 79 is supported by the main rail 72 via a slider 80 (see FIG. 7(a)). The handle support 79 supports the handle shaft 78 so that it can rotate around an axis extending in the Y direction.

[0034] In the cutting position adjustment mechanism 70, the pinion gear 74 rolls on the rack gear 73 by rotating the operating handle 75 around an axis extending in the Y direction. As the pinion gear 74 rolls, the drill base 61 moves along the main rail 72, and the drill body 60 moves in the X direction. This adjusts the position of the cutting tool 67 in the shaft core insertion part 21.

[0035] (shaft support mechanism) The shaft support mechanism 85 is a mechanism that supports the shaft 63 and moves the tip of the shaft 63 around the rotation axis 64. The shaft support mechanism 85 has a support base 86, a rotary plate 87, and a rotary plate bearing portion 88.

[0036] The tip of the rail base 71 is fixed to the support base 86. Also, a rotary plate bearing portion 88 that rotatably supports a rotary plate 87 is fixed to the support base 86. The rotary plate 87 is supported on the support base 86 via a rotary plate bearing portion 88. The rotary plate 87 has a rotary plate main body 89 and a rotary plate shaft portion 90.

[0037] The rotating plate body 89 has a disk shape. The rotating plate shank 90 has a cylindrical shape. The rotating plate shank 90 is integrally formed at the center of the rotating plate body 89 on the drill body 60 side. The rotating plate 87 is formed so that the central axis of the rotating plate body 89 and the central axis of the rotating plate shank 90 coincide with each other.

[0038] The rotating plate 87 has a shaft hole 91. The shaft hole 91 is formed at a position eccentric to the central axis of the rotating plate 87 (see FIG. 7(b)). The shaft hole 91 is a hole through which the shaft 63 is inserted. More specifically, the shaft hole 91 is a hole through which a portion of the shaft 63 that is closer to the base end than the cutting tool 67 is inserted.

[0039] As shown in Fig. 8, a plurality of lightening holes 92 are formed in the rotating plate main body 89 so as to surround the rotating plate shaft portion 90. The plurality of lightening holes 92 are formed at equal intervals around the rotating shaft 64. The lightening holes 92 are sized to function as operation holes when an operator rotates the rotating plate 87. The formation of these lightening holes 92 contributes to reducing the weight of the rotating plate 87. It is preferable that the rotating plate 87 be made of wood, taking into consideration friction with the shaft 63, the weight of the rotating plate 87, and ease of operation by the operator.

[0040] The rotary plate bearing portion 88 is fixed to the rail base 71. The rotary plate bearing portion 88 may be fixed directly to the rail base 71, or may be fixed to the rail base 71 via a support base 86. The rotary plate bearing portion 88 rotatably supports a rotary plate shaft portion 90 of the rotary plate 87.

[0041] 9, in the shaft support mechanism 85, a shaft hole 91 is formed at an eccentric position in the rotary plate 87. Therefore, when the rotary plate 87 rotates, the shaft 63 moves around the rotary axis 64 with the joint 66 as the base point, and the cutting tool 67 moves around the rotary axis 64.

[0042] (Other Organizations) The drilling device 55 includes a pair of sub-rails 95A, 95B. The pair of sub-rails 95A, 95B are provided at a predetermined interval in the X direction. The pair of sub-rails 95A, 95B extend in the Y direction.

[0043] The sub-rail 95A supports the rail base 71 via a slider 96A so as to be movable in the Y direction. The rail base 71 is configured so as to be fixable to the sub-rail 95A by a fixture or the like (not shown).

[0044] The sub-rail 95B supports the support base 86 via a slider 96B so as to be movable in the Y direction. The support base 86 is configured so as to be fixable to the sub-rail 95B by a fixture or the like (not shown).

[0045] A handle 93 that is operated when moving the support base 86 along the sub-rail 95B is attached to the support base 86. The pair of sub-rails 95A, 95B and the sliders 96A, 96B constitute a lateral movement mechanism.

[0046] (Wide section forming step) 10, the widened portion forming step will be described together with the method of using the drilling device 55. At the start of the widened portion forming step, the core material insertion portion 21 is formed in the wooden shaft 11.

[0047] 10(a), first, the central axis of the shaft core material insertion portion 21 is aligned with the central axis (rotation axis 64) of the drilling device 55, and then the wooden shaft 11 is fixed using a fixture (not shown). Then, the cutting position adjustment mechanism 70 is used to adjust the position so that the cutting tool 67 is located at the formation position of the connection hole widening portion 22.

[0048] 10(b), the drill body 60 is driven to rotate the shaft 63. Then, the rotary plate 87 is rotated to move the cutting tool 67 around the rotation axis 64. As a result, the inner surface of the shaft core insertion portion 21 is cut by the cutting tool 67, thereby forming the connection hole widened portion 22. Once the connection hole widened portion 22 is formed, the drill body 60 is stopped.

[0049] 10(c), the cutting position adjustment mechanism 70 is used to adjust the position of the cutting tool 67 so that it is positioned at the position where the next connection hole widening portion 22 is to be formed. Then, the drill body 60 is driven, and then the rotary plate 87 is rotated, thereby forming a new connection hole widening portion 22.

[0050] By repeating the process of adjusting the position using the cutting position adjustment mechanism, driving the drill body 60, rotating the rotating plate 87, and stopping the drill body 60, the connection hole widening portion 22 is formed at each formation position.

[0051] The operation and effects of this embodiment will be described. (1) By forming the connection hole widening portion 22 using the drilling device 55, in the connection structure 10, the widening portion 28 of the filler material 17 has a reduced diameter surface 35 that forms an acute angle with the inner casing portion 27. This increases the proportion of force transmitted from the other component 12 to the wooden shaft 11 via the connection surface 11a of the wooden shaft 11 when a pushing force acts to push the shaft connecting member 13 into the wooden shaft 11. As a result, the shear force generated in the filler material 17 at the boundary between the inner casing portion 27 and the widening portion 28 can be reduced.

[0052] (2) The degree of freedom in the shape of the connection hole widened portion 22 can be increased compared to a configuration in which the connection hole widened portion 22 is semicircular in axial cross section. (3) In the connection structure 10, the angle of inclination of the diameter-reducing surface 35 is an acute angle, and the end face angle of the widening surface 34 is equal to or greater than the complementary angle to the angle of inclination. This ensures resistance to pull-out force while more reliably reducing the shear force generated in the filler 17 at the boundary between the inner portion 27 and the widening portion 28 when a pushing force acts on the shaft connecting member 13. In addition, the bearing surface between the wooden shaft 11 and the widening portion 28 can be increased when a pushing force acts on the shaft connecting member 13. As a result, the resistance generated in the wooden shaft 11 near the bearing surface can be effectively dispersed.

[0053] (4) The angle θ2, which is the end face angle of the widened surface 34, is less than 90°, so that air can be smoothly removed from the widened portion 22 of the connection hole when the filling material is injected. (5) The filler material 17 has multiple widened portions 28 formed at intervals in the axial direction. This allows the wooden shaft 11 to resist the pull-out force at multiple pull-out end faces 26. That is, the wooden shaft 11 can resist the pull-out force by effectively distributing the force across the multiple pull-out end faces 26. As a result, splitting fracture caused by the pull-out force is less likely to occur in the wooden shaft 11. Furthermore, when a pushing force acts on the shaft connecting member 13, the widened portions 28 can deflect the pushing force. This allows the wooden shaft 11 to resist the pushing force not only near the innermost portion of the connecting hole 15, but also near the connecting surface 11a of the wooden shaft 11 when another component 12 is connected to the connecting surface 11a. As a result, splitting fracture caused by the pushing force is less likely to occur in the wooden shaft 11.

[0054] (6) Furthermore, by forming a plurality of widened portions 28, it is possible to reduce the diameter of the widened portions 28 while suppressing splitting fracture. As a result, for example, when a plurality of shaft connecting members 13 are provided on the wooden shaft 11, it is possible to reduce the edge clearance dimension of the wooden shaft 11.

[0055] (7) The drilling device 55 includes a cutting position adjustment mechanism 70 that moves the drill body 60 along the rotation axis 64 and adjusts the position of the cutting tool 67 within the shaft core material insertion portion 21. This improves the workability when forming multiple connection hole widening portions 22 at predetermined intervals in the axial direction.

[0056] (8) The drilling device 55 has a wobble prevention portion 65 that restricts wobble of the rotating shaft portion 62 around the rotating axis 64. This makes it possible to suppress wobble of the rotating shaft portion 62 even if the shaft 63 moves around the rotating axis 64 with the joint 66 as the base point.

[0057] (9) The rotating plate 87 has a plurality of lightening holes 92 formed to surround the shaft hole 91. This allows the weight of the rotating plate 87 to be reduced, and the lightening holes 92 can be used as operation holes for rotating the rotating plate 87. Furthermore, since the rotating plate 87 is made of wood, the weight of the rotating plate 87 can be further reduced.

[0058] (10) The drilling device 55 includes a lateral movement mechanism that supports the drill body 60, the cutting position adjustment mechanism 70, and the shaft support mechanism 85 so that they can move in the Y direction. This allows the lateral movement mechanism to be used to align the shaft material insertion portions 21 with the drill body 60 when the shaft material insertion portions 21 are formed in the wooden shaft 11 so as to be aligned in the lateral direction. As a result, it is possible to improve the workability when forming the connecting hole widening portions 22 in the multiple shaft material insertion portions 21 aligned in the lateral direction.

[0059] This embodiment can be modified as follows: This embodiment and the following modifications can be combined and implemented within the scope of technical compatibility. When connecting the first wooden shaft 11A and the second wooden shaft 11B, the filler material may be injected into the connection holes 15 of the wooden shafts 11A and 11B with the shaft core material 16 disposed therein.

[0060] The drilling device 55 does not have to be equipped with a lateral movement mechanism. In this case, the cutting position in the lateral direction is adjusted by moving the wooden shaft 11. The cutting position adjustment mechanism 70 may be any mechanism that moves the drill body 60 along the rotation axis 64. For this reason, it may be configured such that the pinion gear 74 rolls on the rack gear 73 by being driven by an electric motor such as a motor.

[0061] The drilling device 55 does not have to be equipped with the cutting position adjustment mechanism 70. In this case, the cutting position in the X direction is adjusted by moving the wooden shaft material 11. The technical concepts that can be understood from the above-described embodiments and modifications will be described below.

[0062] (Appendix 1) The drilling device includes a vibration prevention portion that restricts vibration of the rotary shaft portion around the rotary shaft.

[0063] (Appendix 2) The rotary plate has a plurality of lightening holes formed to surround the shaft hole. (Appendix 3) The rotating plate is made of wood.

[0064] (Appendix 4) The drilling device includes a lateral movement mechanism that supports the drill body so that the drill body can move in a direction intersecting the rotation axis in a top view. [Explanation of symbols]

[0065] 10...Connection structure, 11...Wooden shaft material, 11a...Connection surface, 11b...Side surface, 11A...First wooden shaft material, 11B...Second wooden shaft material, 12...Other member, 13...Shaft connecting material, 15...Connection hole, 16...Shaft core material, 17...Filler material, 18...Communicating hole, 21...Shaft core material insertion portion, 22...Connection hole widening portion, 25...Inclined surface, 26...Pulling-out side end surface, 27...Inside portion, 28...Widening portion, 29...Diameter, 34...Widening surface, 35...Narrowing surface, 37...Communicating hole, 50...Wooden shaft material with shaft connecting material, 55...Drilling device, 60...Drill body, 61...Drill base, 62...Rotating shaft portion, 63...Shaft, 64...Rotating shaft, 65 ...Anti-vibration portion, 66...Joint, 67...Cutting tool, 70...Cutting position adjustment mechanism, 71...Rail base, 72...Main rail, 73...Rack gear, 74...Pinion gear, 75...Operating handle, 76...Slider, 77...Bracket, 78...Handle shaft portion, 79...Handle support portion, 80...Slider, 85...Shaft support mechanism, 86...Support base, 87...Rotating plate, 88...Rotating plate bearing portion, 89...Rotating plate main body, 90...Rotating plate shaft portion, 91...Shaft hole, 92...Lightweight hole, 93...Handle, 95A, 95B...Sub-rail, 96A, 96B...Slider.

Claims

1. A drilling device for forming a hole widening portion in a wooden shaft material having a linearly extending hole, The drill body and a shaft having a base end connected to the rotation shaft portion of the drill body via a joint and extending along the rotation axis of the rotation shaft portion; a rotating plate configured to be rotatable around the rotation axis as a central axis and having a shaft hole through which the shaft is inserted; a cutting tool attached to the tip of the shaft and configured to cut the side surface of the hole; the joint is configured to transmit torque of the rotating shaft portion to the shaft and to bend the shaft relative to the rotating shaft, the rotary plate has the shaft hole at a position eccentric to the rotation axis, The rotation of the rotary plate causes the tip of the shaft to move around the rotation axis. Drilling equipment.

2. a cutting position adjustment mechanism that moves the drill body along the rotation axis and adjusts the position of the cutting tool within the hole; 2. The drilling device of claim 1.

3. The cutting position adjustment mechanism includes: a rail base extending along the rotation axis; a rail fixed to the rail base and extending along the rotation axis; a rack gear fixed to the rail base and extending along the rotation axis; a pinion gear that meshes with the rack gear and rolls on the rack gear to move the drill body along the rail.

3. The drilling device of claim 2.

4. a rotary plate bearing portion fixed to the rail base and rotatably supporting a rotary plate shaft portion of the rotary plate; 4. The drilling device of claim 3.

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