JP4275051B2 - Wood hole expansion part cutting device - Google Patents

Description

The present invention relates to timber hole extension switching KezuSo location. More specifically, it is easy even for an unskilled worker to provide a hole expanding portion at a required position inside a hole constituting a joining structure that is not exposed on the surface for joining a structural component such as wood. In addition, the present invention relates to a structure in which a hole expanding portion can be quickly and uniformly formed into a required shape.

  In modern architecture, there is an increasing number of buildings that are intentionally exposed so that the framework of wood such as beams can be seen from the bottom without extending the ceiling board, and used as it is as a design. In such a building, when a joining metal fitting is used for joining wood, the metal is exposed on the surface, and the aesthetic appearance is impaired. In addition, the exposed metal is liable to cause condensation, and not only the corrosion of the wood easily progresses, but also there is a problem that the fire resistance is low because heat is easily transferred directly to the metal part. Furthermore, when “wood thinning” occurs on wood such as beams and girders due to aging, there is a high possibility that a gap will occur between the wood and the joint fitting. In this case, the joint fitting will loosen and the wooden building will be durable. The nature will decline.

In order to solve such a problem, the inventor of the present application can maintain firmly the bonding between the building components in Patent Document 1 in a state where the bonding portion of the building components such as wood is not exposed on the surface. A structure was proposed.
In this structure, a required number of hole expansion portions are provided to expand the outer diameter of the holes in the holes provided in the bonding portions of the respective building components to be bonded, and the bonding members are accommodated so as to extend over each hole. Furthermore, each hole is filled with an adhesive for fixing the bonding member in the hole and solidified, so that the adhesive solidified at the hole expansion portion functions as a stopper to prevent the bonding member from coming out of each hole. is there.

In the said structure, the operation | work which forms a hole expansion part in the required location inside a hole is needed. This operation is performed as follows as described in Patent Document 1. FIG. 5 shows an explanatory diagram thereof.
The hole expanding portion is formed by using an electric drill 7 having a drill 71 at the tip. In addition, although the formation method of the back side hole expansion part 91 is demonstrated in FIG. 5, it forms in the same way also about the hole expansion part of an intermediate part.
As the drill 71, for example, a long shank 711 with a round bit cutting router bit 712 fixed thereto is used. Since the outer diameter of the router bit 712 is smaller than the inner diameter of the hole, the drill 71 can be inserted into the hole 90 without any trouble.

First, the drill 71 is inserted into the hole 90 from the state of FIG. 5A, and when the router bit 712 reaches a required depth, the electric drill 7 is operated. Then, as shown in FIG. 5B, the electric drill 7 is tilted, and the drill 71 is slightly tilted with respect to the axial direction of the hole 90. As a result, a part of the hole expanding portion 91 is cut by the router bit 712 on the inner wall portion of the hole 90. Further, as shown in FIG. 5C, the electric drill 7 is operated, and the router bit 712 is moved along the inner wall portion in the circumferential direction of the hole 90 and cut to form the whole hole expanding portion 91. . In the manner described above, the hole expanding portions 91 are formed, for example, at two locations near the bottom inside the hole and in the middle portion.
JP 2004-92058 A

However, the above method described in Patent Document 1 has the following problems.
In other words, the electric drill is held by the operator and is operated while adjusting the power depending on the sense of the hand, so that an unskilled operator takes a considerable amount of time for the operation.
In addition, when the electric drill is held by hand, the inclination of the shank 711, the height of the router bit 712, the movement in the circumferential direction is not stable, the overhanging depth of the hole expansion part is shallow, and it tends to be an irregular shape. It was difficult to uniformly form the required shape. For this reason, the adhesive solidified inside the hole expansion portion does not sufficiently function as a stopper, and the prescribed joining force of the building component may not be obtained.

(Object of the present invention)
It is an object of the present invention to provide a hole expansion portion at a required location inside a hole constituting a joining structure that is not exposed on the surface for joining a structural member such as wood, even for an unskilled worker. , easily and quickly can make the hole extension uniformly to the required shape, the bonding force of the provisions of the architectural components to provide a timber hole extension switching KezuSo location which is adapted stably obtained That is.

Means taken by the present invention to solve the above problems are as follows.
In the first invention,
The required position inside the holes constituting the joint structure is not exposed to the surface for joining building components, a timber hole extension cutting device for forming a hole extension of larger diameter than the hole ,
An insertion shaft member which can be inserted into the hole to be processed so as to be rotatable in the axial circumferential direction;
Are housed in the insertion axis member, and the rotation shaft of the cutting blade is provided on the tip portion imparts rotational force,
An eccentric operation means capable of moving the rotary shaft between an eccentric position where a required amount extends from a position where the rotation trajectory of the cutting blade of the cutting blade falls within the outer diameter of the insertion shaft member;
Means for fixing the rotating shaft (2) in an eccentric position;
Equipped with a,
The insertion shaft member is formed of a circular tube having an internal space, and an eccentric opening leading to the internal space is provided in the peripheral wall at the tip thereof by cutting the peripheral wall,
The eccentric operation means includes an eccentric operation tool and a rotary bearing tool, the eccentric operation tool has a shaft portion, and the tip shaft portion provided on the tip side of the shaft portion has a rotation operation of the eccentric operation tool. The rotating bearing that rotates by is fixed,
A rotary shaft is rotatably supported in the shaft hole in the intermediate part of the rotary bearing tool.
It is a hole expansion part cutting device for wood .

In the second invention,
The distal end of the insertion shaft member, the wood chips that are cut by the cutting blade induction port inducing the internal space provided we are, the peripheral wall is provided with an opening leading to the interior space,
The guide surface constituting the guide port is formed so as to be narrowed toward the back side, and a means for preventing the return of wood chips is provided at the back end of the guide port,
It is a hole expansion part cutting device for wood which concerns on 1st invention.

In the third invention,
A depth adjusting means capable of adjusting the depth position of the cutting blade in the hole;
It is the hole expansion part cutting device for wood which concerns on either 1st or 2nd invention.

  The rotational force applied to the rotary shaft may be by human power (manual) or by a machine such as a motor.

  As a means to prevent the wood chips from returning, the structure is formed at a different angle from the guide surface so that the wood chips once guided to the internal space can be prevented from returning to the cutting blade side through the induction port, Or although it is the structure etc. which have a baffle member, it is not limited to these.

  For example, if the positional relationship between the insertion shaft member and the cutting blade in the axial direction is fixed, the depth adjustment means may be configured to adjust the insertion depth of the insertion shaft member to adjust the depth position of the cutting blade. It is done. Moreover, as long as the position of the insertion shaft member and the cutting blade in the axial direction moves relative to each other, a structure in which the position of the rotary shaft itself having the cutting blade is adjusted can be mentioned, but the structure is not limited to these.

(Function)
The operation of the hole expanding portion cutting apparatus according to the present invention will be described. Here, each constituent element of the present invention will be described by giving a reference numeral given to each part in the embodiment described later, but this provision of the reference sign is only for the purpose of helping understanding of the explanation. Therefore, it does not mean that each constituent element is limited to the above-described parts.

  The hole expanding portion cutting device (C) is provided with a hole expanding portion (91) at a required location inside the hole (90) constituting the joining structure that is not exposed on the surface for joining the structural component (9) such as wood. ). The work is performed as follows.

(1) A rotational force can be applied by, for example, connecting the motor drive shaft (29) to the rotation shaft (2). Further, the eccentric operation means (4, 5) is used to position the rotary shaft (2) so that the rotation locus of the cutting blade (30) of the cutting blade (3) is within the outer diameter of the insertion shaft member (1). Keep it.
(2) Insert the insertion shaft member (1) into the hole (90) provided in the building component (9). Since the cutting blade (3) does not contact the inner wall of the hole (90) and does not get in the way, smooth insertion is possible. For example, the depth position of the cutting blade (3) is adjusted to a required depth by a depth adjusting means (6) or the like that can adjust the depth position of the cutting blade (3) in the hole (90).

(3) Rotate the rotating shaft (2). Then, by the eccentric operation means (4, 5), the rotational path of the rotary shaft (2) is moved from the above position to the rotational locus of the cutting blade (30) of the cutting blade (3) by the required amount from the outer diameter of the insertion shaft member (1). Move to the eccentric position (132). Further, for example, the rotating shaft (2) is fixed (rotatable) by means (42, 153) for fixing the rotating shaft (2) at the eccentric position (132). The inner wall of the hole (90) is partly cut by the protruding cutting blade (3).

(4) The insertion shaft member (1) is rotated in the axial direction in the hole (90) while maintaining the positional relationship between the cutting blade (3) and the insertion shaft member (1). For example, if the handle (15) is provided on the insertion shaft member (1), it can be easily rotated. Since the insertion shaft member (1) can be rotated with substantially no clearance from the inner wall of the hole (90), there is no runout of the shaft during rotation, and it is necessary for the entire circumference at the position of the required depth of the hole (90). A groove having a depth and a shape of is accurately cut, and a hole expansion portion (91) having a diameter larger than the hole diameter is formed. Wood chips cut by the cutting blade (3) are guided, for example, from the guide port (130) to the internal space (19) of the insertion shaft member (1). Further, the wood waste guided to the internal space (19) is prevented from returning to the cutting side by means (136) for preventing the wood waste from returning, for example. If the wood chips do not return to the cutting side, scorching (carbonized portions) due to an increase in frictional resistance due to the presence of the wood chips in the cutting portion is less likely to occur.

  Further, when the cutting blade (3) is formed so that the outer peripheral surface of the rotation locus of the cutting blade (30) is narrowed toward the tip, the portion where the inner periphery of the hole expanding portion (91) and the hole (90) intersects ( The corner of D) (boundary part) becomes an obtuse angle. According to this, when a joining member such as a bolt is inserted after forming the hole expansion portion (91) in the hole (90), the hole (90) 90) It is easy to be guided in the center direction and is not easily caught. Thereby, the insertion operation of a joining member can be performed smoothly. Furthermore, since the cutting blade (3) has the shape as described above, the thickness in the axial direction is increased as compared with, for example, a router bit, and the surface to be cut by the cutting blade (3) is also a hole expanding portion (91 ) Space is also large, so heat is easily dissipated and the cut surface is not easily burnt.

(5) After forming the one hole expansion portion (91), the eccentric operation means (4, 5) is operated to return the rotary shaft (2) to the center (131), and the cutting blade (3) is inserted into the insertion shaft member. Fit within the outer diameter of (1). Then, the insertion shaft member (1) is extracted from the hole (90), and wood chips are discharged by blowing air into the hole (90). Further, the wood chips stuck in the inside (19) of the insertion shaft member (1) are removed through the openings (12, 14).
(6) The steps (1) to (5) are repeated as necessary, with the depth position of the cutting blade (3) being different from the above position.

(A) According to the present invention, a rotational force can be applied to the rotation shaft, and the position of the rotation shaft is set so that the rotation locus of the cutting blade of the cutting blade is within the outer diameter of the insertion shaft member. The insertion shaft member is inserted into the hole provided in the structural member, and the rotational shaft is rotated by applying rotational force to the rotational shaft. The rotational locus of the cutting blade of the cutting blade is moved from the above position to the outside of the insertion shaft member. By moving to an eccentric position where the required amount extends from the diameter, and further rotating the insertion shaft member in the axial direction within the hole, a hole expansion portion having a diameter larger than the hole diameter at the position of the required depth of the hole is particularly skilled. Even non-workers can easily and quickly make a uniform shape as required. Thereby, the regular joining force of the structural member for building is stably obtained.

(B) At the tip of the insertion shaft member, a guide port for guiding the wood chips cut by the cutting blade to the internal space is provided, and the peripheral wall is provided with an opening leading to the internal space. After removing the insertion shaft member, if the wood chips clogged in the internal space of the insertion shaft member are removed, the wood waste can be easily removed by discharging from the opening. By removing the wood chips clogged in the internal space of the insertion shaft member, the rotation shaft can be returned to the original position by the eccentric operation means.

(C) The guide surface constituting the guide port is formed so as to be narrowed toward the back side, and a means for preventing the return of wood chips at the back end of the guide port is returned to the cutting side. Since there is not, it becomes difficult to produce the charring (carbonization part) by the increase in the frictional resistance resulting from there being wood chip in a cutting part.

(D) A device provided with a depth adjusting means capable of adjusting the depth position of the cutting blade in the hole can easily form the hole expansion portion at a predetermined depth position in the hole.

The present invention will be described in detail based on the embodiments shown in the drawings.
FIG. 1 is a perspective view showing an embodiment of a hole expanding portion cutting device according to the present invention,
FIG. 2 is a perspective explanatory view showing a state in which the rotating shaft is eccentric and the cutting blade protrudes from the tubular body,
3A and 3B show the structure of the distal end portion of the tubular body. FIG. 3A is a view taken along the arrow A in which the cutting blade is omitted in FIG. 2, and FIG.

  The hole expanding portion cutting device C includes an insertion shaft member 1, a rotary shaft 2 that passes through the inside of the insertion shaft member 1 and has a cutting blade 3 at the tip, and the position of the rotary shaft 2 is the center of the insertion shaft member 1. An eccentric operating tool 4 and a rotary bearing tool 5 that move between the eccentric position, a depth adjuster 6 that can adjust the depth position of the cutting blade 3 in the hole, and a handle tool 15 that is attached to the insertion shaft member 1. It has. Hereinafter, each of the above will be described in detail.

(Insertion shaft member 1)
The insertion shaft member 1 is formed of a metal circular tube and has an internal space 19. The outer diameter of the insertion shaft member 1 (circular tube) is formed such that when inserted into the hole to be processed, there is essentially no gap between the inner wall and the shaft can rotate in the axial direction. Further, regarding the length of the insertion shaft member 1, if it is formed long, it is possible to process a short (shallow) hole.

  The peripheral wall at the base end of the insertion shaft member 1 is provided with an opening 10 through which the lever portion 42 of the eccentric operation tool 4 to be described later is taken out. Further, a bearing tool 16 having a shaft hole 160 (shown in FIG. 4) for inserting a rotary shaft 2 described later in a rotatable manner is fitted into and fixed to the proximal end of the insertion shaft member 1. ing.

  Further, a handle tool 15 is fixed to the proximal end of the insertion shaft member 1. The handle 15 is composed of a substantially cylindrical fixing portion 150 and two handle bars 151 and 152 provided on the extension of the diameter line thereof. An engagement piece 153 for engaging a lever portion 42 of the eccentric operation tool 4 to be described later is provided at an intermediate portion of one handle bar 151. The eccentric operation tool 4 can fix the rotating shaft 2 in the eccentric position by engaging the lever portion 42 with the engagement piece 153.

  Further, the fixing portion 150 is provided with a notch 154, and the position of the notch 154 is aligned with the opening 10. Note that a fixing screw 155 is screwed into the fixing portion 150 through the peripheral wall, and the position of the fixing portion 150 with respect to the insertion shaft member 1 (the position in the axial direction and the axial circumferential direction) can be adjusted.

  On the peripheral wall at the tip of the insertion shaft member 1, an eccentric opening 11 leading to the internal space 19 and a cleaning opening 12 are continuously provided by cutting out the peripheral wall. A circular cleaning hole 14 is provided on the back side of the cleaning opening 12. The lengths in the axial direction of the eccentric opening 11 on the front end side and the cleaning opening 12 are different, and the cleaning opening 12 is set to be longer than the eccentric opening 11 (about 5 times in this embodiment). It is. Further, the opening angles of the eccentric opening 11 and the cleaning opening 12 are also different. The eccentric opening 11 is set to about 90 °, and the cleaning opening 12 is set to about 180 °. The length ratio and the opening angle are not limited to the above as long as the functions are not impaired, and can be set as appropriate.

  A rotating shaft guide 13 is fixed inside the eccentric opening 11. The thickness of the rotating shaft guide 13 is formed to be approximately the same as the length of the eccentric opening 11 in the axial direction. The rotation shaft guide 13 is provided with a guide port 130 penetrating in the thickness direction. The guide port 130 includes a center port 131 located substantially at the center of the insertion shaft member 1, an eccentric port 132 opened according to the position of the eccentric opening 11, and a guide port 133 connecting them. .

The guide port 133 is provided so as to be curved in an arc shape with a fulcrum hole 135 and a center port 131 (or an eccentric port 132) as a radius between the fulcrum hole 135 described later (see FIG. 3A). ).
The diameters or widths of the center port 131, the eccentric port 132, and the guide port 133 are set to be slightly larger than the outer diameter of the rotating shaft 2, and the rotating shaft 2 can move smoothly between the center port 131 and the eccentric port 132. The eccentric port 132 can be rotated without any trouble.

  The guide port 130 is formed with a slope so as to be constricted to the back side over the entire length of the edge of the center port 131, the eccentric port 132, and the guide port 133. This slope serves as a guide surface 134 that guides wood chips to be cut by the cutting blade 3 described later to the internal space 19 of the insertion shaft member 1. Further, in the vicinity of one edge of the eccentric port 132 in the rotary shaft guide 13, a fulcrum for rotatably supporting the front shaft portion 40 at the distal end portion of the shaft portion 41 of the eccentric operation tool 4 to be described later. A hole 135 is provided penetrating in the thickness direction.

  Note that the inner end surface 136 (see FIG. 3B) of the rotary shaft guide 13 at the far end of the guide port 130 is perpendicular to the axial direction of the insertion shaft member 1. This angle of the inner end face 136 is not particularly limited as long as it functions to prevent the wood chips once guided to the inner space 19 from returning to the cutting side, and may be provided at an acute angle or an obtuse angle.

(Eccentric operation tool 4, rotating bearing tool 5)
The eccentric operation tool 4 and the rotary bearing tool 5 constitute an eccentric operation means. The eccentric operation tool 4 is formed of a rod-shaped body. The eccentric operation tool 4 is formed in an L shape by bending the rear end side at a right angle, and is composed of a shaft portion 41 and a lever portion 42. On the tip end side of the shaft portion 41, a tip shaft portion 40 formed with a smaller diameter than other portions is provided. The front shaft portion 40 is passed through an attachment hole 51 provided in the base portion of the rotary bearing device 5, and the rotary bearing device 5 is fixed to the front shaft portion 40. The rotation bearing device 5 has a required thickness, and has a shaft hole 50 that can be rotatably supported through a rotation shaft 2 described later in a middle portion having a large width.

Further, in the shaft portion 41, the arm 43 is provided in the vicinity of the rotating bearing 5 so as to be curved in a direction intersecting the shaft portion 41 so as to exclude the rotating shaft 2 described later. The distal end of the arm 43 is fixedly inserted into the distal end side of the rotary bearing 5.
Then, the eccentric operation tool 4 inserts the tip shaft portion 40 at the tip end portion of the shaft portion 41 into the fulcrum hole 135 of the rotation shaft guide tool 13 so as to be rotatable, and the lever portion 42 from the opening 10 of the insertion shaft member 1 to the outside. And is stored in the internal space 19.

(Rotating shaft 2 and cutting blade 3)
In the internal space 19 of the insertion shaft member 1, the rotary shaft 2 having the cutting blade 3 fixed to the distal end portion is accommodated. The rotary shaft 2 is rotatably supported by inserting the front side into the shaft hole 50 of the rotary bearing 5 and the rear side through the shaft hole 160 of the bearing 16. On the rear end side of the rotating shaft 2, an engaging surface 20 (shown in FIG. 1) configured in a plane is provided so that the driving shaft of the motor can be connected to transmit the rotational force. In addition, the shaft hole 160 of the bearing 16 that supports the rear side of the rotary shaft 2 is formed slightly loose in size, and can maintain a rotatable state even when the rotary shaft 2 is inclined and the front side is eccentric. It is like that.

  The cutting blade 3 is fixed to the distal end of the rotary shaft 2 and is positioned on the front side of the rotary shaft guide 13 provided at the distal end of the insertion shaft member 1. The tip of the cutting blade 3 is notched, and a cutting blade 30 is provided at a position facing each other at an angle of 180 ° in the circumferential direction. Each cutting edge 30 is composed of a long blade portion 31 which is substantially straight at the front side and is inclined so as to be narrowed as described above, and a short blade portion 32 which is parallel to the axial direction of the base side. Thereby, the cutting blade 3 is formed so that the outer peripheral surface of the rotation locus of each cutting blade 30 is narrowed toward the tip (see particularly FIG. 4 described later).

(Depth adjustment tool 6)
A circular tubular depth adjuster 6 is attached to the insertion shaft member 1 so as to be movable and adjustable in the axial direction by external fitting. The end surface on the cutting side of the depth adjuster 6 serves as a contact surface 60 that contacts the edge of the hole to be processed.
A fixing screw 61 is screwed into the depth adjuster 6 through the peripheral wall, and the depth adjuster 6 can be fixed to and released from the insertion shaft member 1 by the fixing screw 61. When a scale (not shown) is provided on the outer peripheral surface of the insertion shaft member 1 and the contact surface 60 side of the depth adjuster 6 is aligned with this scale, the depth position of the cutting blade 3 in the hole is set. It is good also as a standard of.

(Function)
FIG. 4 is an explanatory view showing a use state of the hole expanding portion cutting apparatus.
With reference to FIG. 1 thru | or FIG. 4, the effect | action of the hole expansion part cutting device which concerns on this Embodiment is demonstrated.

  The hole expanding portion cutting device C has an inner diameter at a required position inside a hole 90 constituting a joining structure (see paragraph [0003] above) that is not exposed on the surface for joining a building structural member 9 such as wood. Forms a larger hole expanding portion 91.

(1) The driving shaft 29 (see FIG. 4) of the motor is connected to the rotating shaft 2 so that a rotational force can be applied. Further, the rotary shaft 2 is positioned at the center port 131 (center) of the guide ports 130 of the rotary shaft guide 13 such that the lever 42 is positioned as shown in FIG. Thereby, the rotation locus | trajectory of the cutting blade 30 of the cutting blade 3 is settled in the outer diameter of the insertion shaft member 1 (refer Fig.3 (a)).

(2) The insertion shaft member 1 is inserted into the hole 90 provided in the building component 9. Since the cutting blade 3 does not contact the inner wall of the hole 90 and does not get in the way, smooth insertion is possible. Note that the contact surface 60 of the depth adjuster 6 fixed in advance in accordance with the depth position of the cutting blade 3 in the hole 90 (position where the hole expanding portion 91 is provided) contacts the edge of the hole 90. Let Thereby, the position where the hole expansion part 91 is provided is determined.

(3) The motor is driven, and the rotational force of the drive shaft 29 is transmitted to the rotary shaft 2 to rotate it. Then, the lever portion 42 of the eccentric operation tool 4 is rotated and engaged with the engagement piece 153 of the handle bar 151. The rotation bearing 5 is rotated by the rotation operation of the lever portion 4, and the rotation shaft 2 supported by the shaft hole 50 moves from the center port 131 to the eccentric port 132 through the guide port 133. Then, by the engagement of the lever portion 42 and the engagement piece 153, the rotary shaft 2 is fixed in a rotatable state at that position. Since the rotary shaft 2 is positioned at the eccentric port 132, the rotation locus of the cutting blade 30 of the cutting blade 3 protrudes from the outer diameter of the insertion shaft member 1 by a required amount (see FIG. 3A). Thereby, the inner wall of the hole 90 is partly cut by the cutting edge 30 of the protruding cutting blade 3 (see FIG. 4).

(4) With the rotary shaft 2 in the eccentric position as described above (the positional relationship between the cutting blade 3 and the insertion shaft member 1 remains the same), the operator operates the handle tool 15 to rotate the insertion shaft member 1. For example, it is rotated several times in the axial direction in the hole 90. At this time, since the insertion shaft member 1 can be rotated with substantially no clearance from the inner wall of the hole 90, there is no shake of the shaft during rotation, and the required depth is provided around the entire position of the required depth of the hole 90. And the groove | channel of a shape is cut accurately, and the hole expansion part 91 larger diameter than a hole diameter is made.
The wood chips cut by the cutting blade 30 of the cutting blade 3 are guided from the guide port 130 to the internal space 19 of the insertion shaft member 1 by the pressure at the time of cutting. This guidance is performed smoothly by the inclined guidance surface 134. Wood chips guided to the internal space 19 are not easily returned to the cutting side by the action of the inner end surface 136 that is perpendicular to the axial direction of the insertion shaft member 1.

  Further, since the outer peripheral surface of the rotation locus of the cutting blade 30 of the cutting blade 3 is formed so as to be narrowed toward the tip, the corner of the portion D (see FIG. 4) where the hole expanding portion 91 and the inner periphery of the hole 90 intersect with each other. Becomes obtuse. According to this, when a joining member such as a bolt is inserted later when the joining structure is formed, it is easily guided toward the center of the hole 90 by the inclined surface of the hole expanding portion 91 even if the tip of the joining member comes into contact with the corner. It becomes difficult. Thereby, there exists an advantage which can insert the joining member smoothly. Further, since the cutting blade 3 has the shape as described above, the thickness in the axial direction is increased as compared with, for example, a router bit, and the surface of the cutting blade 3 to be cut by the cutting blade 30 is also formed by the hole expanding portion 91. Since the space also becomes large, there is an advantage that heat is easily dissipated and the cut surface is hardly burnt.

(5) After forming the one hole expanding portion 91, the eccentric operation tool 4 is operated to return the rotary shaft 2 to the central port 131 of the rotary shaft guide tool 13, and the cutting blade 3 is set to the outer diameter of the insertion shaft member 1. To fit. Then, the insertion shaft member 1 is extracted from the hole 90, and wood chips are discharged by blowing air into the hole 90. Further, wood chips clogged in the internal space 19 of the insertion shaft member 1 are removed through the cleaning opening 12 and the cleaning hole 14.
(6) The fixing position of the depth adjuster 6 is changed to a required position, the depth position of the cutting blade 3 is changed from the above position, and the operations (1) to (5) are performed as necessary. In this way, the required number of hole expanding portions 91 can be formed in the hole 90.

  Then, a joining member (for example, a bolt) is inserted into the hole 90 of one building structural member 9 of the two building structural members 9 to be joined, and 1/2 of the joining member is projected from the hole 90. The other building component 9 is fitted in the protruding joint member at the position where the hole 90 is fitted and the holes 90 communicate with each other. In this state, each hole 90 (including the hole expanding portion 91) communicating with each other is filled with an adhesive, and the joining member is solidified so as to be wrapped in the hole 90.

  According to the hole expanding portion cutting apparatus C according to the present embodiment, the hole expanding portion 91 having a diameter larger than the hole diameter at the position of the required depth of the hole 90 can be easily and quickly required even by an unskilled operator. Can be made uniform in shape. The above-described joining structure including the hole 90 and the hole expanding portion 91 formed as described above enables the building components 9 to be firmly joined to each other, and the specified joining force of the building component 9 can be stably obtained. .

  Note that the terms and expressions used in the present specification are merely explanatory and not restrictive, and do not exclude terms and expressions equivalent to the above terms and expressions. The present invention is not limited to the illustrated embodiment, and various modifications can be made within the scope of the technical idea.

The perspective view which shows one Embodiment of the hole expansion part cutting device which concerns on this invention. FIG. 6 is a perspective explanatory view showing a state in which the rotating shaft is eccentric and the cutting blade projects from the tubular body. The structure of a tube front-end | tip part is shown, (a) is A arrow directional view which abbreviate | omitted the cutting blade in FIG. 2, (b) is BB sectional drawing. Explanatory drawing which shows the use condition of a hole expansion part cutting device. Explanatory drawing which shows the construction method of the conventional hole expansion part.

Explanation of symbols

C Hole Expanding Section Cutting Device 1 Insertion Shaft Member 10 Opening 11 Eccentric Opening 12 Cleaning Opening 13 Rotating Shaft Guide 130 Guide Port 131 Center Port 132 Eccentric Port 133 Guide Port 134 Guide Surface 135 Supporting Hole 136 Inner End Surface 14 Cleaning Hole DESCRIPTION OF SYMBOLS 15 Handle tool 150 Adhering part 151, 152 Handle bar 153 Engagement piece 154 Notch 155 Fixing screw 16 Bearing tool 160 Shaft hole 19 Internal space 2 Rotating shaft 20 Engagement surface 29 Drive shaft 3 Cutting blade 30 Cutting blade 31 Long blade part 32 Short blade part 4 Eccentric operation tool 40 Lead shaft part 41 Shaft part 42 Lever part 43 Arm 5 Rotating bearing tool 50 Shaft hole 51 Mounting hole 6 Adjusting tool 60 Abutting surface 61 Fixed screw 9 Construction component 90 Hole 91 Hole Expansion part D The part where the hole expansion part and the inner circumference of the hole intersect

Claims (3)

Within the required locations of the holes constituting the joint structure is not exposed to the surface for joining building components (90), timber for forming the hole extension of larger diameter (91) than said hole (90) A hole expanding section cutting device for use ,
An insertion shaft member (1) that can be inserted into the hole (90) to be processed so as to be rotatable in the axial circumferential direction;
Insert shaft member (1) is contained within, the cutting blade provided at the tip portion (3) to the rotary shaft to impart rotational force and (2),
The rotating shaft (2) is positioned between the eccentric position (132) where the required amount extends from the position (131) where the rotation locus of the cutting blade (30) of the cutting blade (3) is within the outer diameter of the insertion shaft member (1). Eccentric operation means (4,5) that can be moved with
Means (42,153) for fixing the rotating shaft (2) at the eccentric position (132);
Equipped with a,
The insertion shaft member (1) is formed in a circular tube having an inner space (19), the peripheral wall of the tip, the eccentric opening (11) leading to the interior space (19) there is provided by cutting away a peripheral wall ,
The eccentric operation means is composed of an eccentric operation tool (4) and a rotary bearing tool (5), and the eccentric operation tool (4) has a shaft portion (41) and is provided on the tip side of the shaft portion (41). A rotating bearing tool (5) that is rotated by a rotating operation of the eccentric operating tool (4) is fixed to the front shaft portion (40),
The rotary shaft (2) is rotatably supported in the shaft hole (50) in the middle part of the rotary bearing tool (5).
Wood hole expansion part cutting device. The distal end of the insertion shaft member (1), the wood chips that are cut by the cutting blade (3) induction port inducing the interior space (19) (130) is provided, et al is, leading to the interior space (19) in the peripheral wall An opening (10) is provided,
The guide surface (134) constituting the guide port (130) is formed so as to be narrowed toward the back side, and a means (136) for preventing the return of wood chips is provided at the back end of the guide port (130). ,
The wood hole expansion part cutting device according to claim 1 . Depth adjustment means (6) that can adjust the depth position of the cutting blade (3) in the hole (90),
The wood hole expansion part cutting apparatus according to claim 1 or 2 .

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