JP3977892B2 - Counter digging cutter - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a counterboring cutter.
[0002]
[Prior art]
For example, a circular seat for attaching a bolt head or nut to a wood used in a wooden house is excavated by a countersink cutter. Conventionally, this counterboring cutter is provided with a plurality of arms extending radially from its rotational axis, and each arm is provided with a digging blade. Then, when performing the countersinking of the circular seat, when the countersink cutter mounted on the rotary shaft of the tool is driven to rotate, the arm and the excavation blade are rotated together, and the circular seat is excavated and formed on the wood.
[0003]
[Problems to be solved by the invention]
However, in the conventional counterboring cutter, the rotation is difficult to stabilize, and the counterboring cutter may vibrate. When vibration occurs in this way, workability and safety are reduced, and high-precision machining becomes impossible.
[0004]
Accordingly, an object of the present invention is to prevent excavation of a settling cutter and excavate with high machining accuracy.
[0005]
[Means for Solving the Problems]
According to a first aspect of the present invention, there is provided a counterboring cutter for excavating a circular seat on a material to be excavated, wherein a plurality of arms extending radially from the rotation axis and having excavation blades are provided, and a circular seat is provided on an outer peripheral surface of each arm. The vibration suppression part is made to project, and the vibration suppression part is constituted by a screw head, and the outer peripheral surface of the head is in contact with the inner peripheral surface of the circular seat. .
[0006]
The gist of the invention described in claim 2 is that, in the invention described in claim 1, the vibration suppressing portion is detachable from the arm .
[0007]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of the invention will be described with reference to the drawings.
As shown in FIG. 1 to FIG. 3, the counterboring cutter 1 includes a cylindrical portion 2 that can be attached to and detached from the drive shaft of the tool 11, and a plurality of radial extending from the rotation axis is provided at the outer end portion of the cylindrical portion 2. The (three in this embodiment) arms 3 are integrally formed. The excavating blade 4 is fixed to the bottom surface of each arm 3 with screws 5. The cutting edge 4 a of each excavation blade 4 protrudes obliquely from the bottom surface of the arm 3. A wood-drawing blade 6 is fixed to the front end surface of one arm 3 with a screw 7. The cutting edge 6 a of the wood pulling blade 6 protrudes obliquely from the distal end surface of the arm 3.
[0008]
As shown in FIGS. 1, 2, and 4, a housing recess 8 is formed on the bottom surface of each arm 3, and a female screw portion 9 is formed on the inner back of each housing recess 8. A screw 10 as a vibration suppressing portion is detachably screwed into each female screw portion 9, and a head portion 10 a of each screw 10 has a short cylindrical shape and is accommodated in the accommodating recess 8. Since each screw 10 is tightened in the same direction as the rotation direction of each arm 3, there is no possibility of screwing out while the arm 3 is being driven. A part of the head 10 a of each screw 10 is slightly protruded from the tip surface of each arm 3.
[0009]
Next, the operation of the counterboring cutter 1 configured as described above will be described.
As shown in FIG. 5, a guide rod 12 protruding from the tip of the drive shaft of the tool 11 is penetrated through the cylindrical portion 2 of the digging cutter 1 and connected and fixed. In this state, the guide bar 12 is inserted into a hole 14 that has been drilled obliquely at a predetermined angle in the wood 13 as the material to be excavated. When the drive shaft of the tool 11 is rotated, the circular seat 15 is excavated and formed on the wood 13 by the excavating blades 4 and the wood pulling blades 6 as the arms 3 are driven. During the excavation, the rotation of each arm 3 is stabilized because a part of the outer peripheral surface of the head 10a of the screw 10 slides on the inner peripheral surface of the circular seat 15. When the head 10 a of the screw 10 is worn by sliding friction with the inner peripheral surface of the circular seat 15, the screw 10 is removed from the female screw portion 9 and removed, and the new screw 10 is screwed onto the female screw portion 9. Match.
[0010]
5 shows a case where the circular seat 15 is excavated obliquely with respect to the surface of the wood 13, and FIG. 6 shows a case where the circular seat 15 is excavated in a direction perpendicular to the surface of the wood 13. . In the case of FIG. 6, the drill 20 is fixed to the cylindrical portion 2.
[0011]
Next, effects that can be found from this embodiment will be described below.
Since a part of the head 10a of the screw 10 provided in each arm 3 slides on the inner peripheral surface of the circular seat 15, the rotation of each arm 3 can be stabilized. Therefore, the excavation cutter 1 does not vibrate when excavating the circular seat 15. Therefore, since the vibration is not transmitted to the tool, workability and safety can be improved and high-precision excavation becomes possible.
[0012]
Each screw 10 is detachable from each arm 3 and can be replaced with a new screw 10 even if each screw 10 is worn.
Since each screw 10 can be easily attached to and detached from each arm 3 due to the screwing relationship, the screw 10 can be replaced quickly.
[0013]
-Since the screw 10 does not slide on the inner peripheral surface of the circular seat 15 and the arm 3 does not contact the inner peripheral surface of the circular seat 15, the wear of the arm 3 is suppressed and the life of the cutter 1 is extended. Can do.
[0014]
If the screw 10 having a different diameter of the head 10a is selected, the contact pressure with respect to the inner peripheral surface of the circular seat 15 can be changed. Therefore, an optimal contact pressure can be ensured according to the type of wood.
[0015]
In addition, you may comprise the said embodiment as follows.
Each screw 10 is omitted, and instead, a projecting portion is integrally formed on the distal end surface of each arm 3.
[0016]
Next, technical ideas other than the claims that can be grasped from the embodiment will be described together with their effects.
(A) the arm receiving portion (accommodating recess 8) is formed in the seat digging cutter head (10a) of that is housed in the this accommodating section screw (screw 10). According to this configuration, when excavating the circular seat, it is possible to prevent rattling with the rotational force of the screw itself.
[0017]
【The invention's effect】
Since this invention is comprised as mentioned above, there exist the following effects.
According to the first aspect of the present invention, when the circular seat is excavated, the vibration suppressing portion is slid on the inner peripheral surface of the circular seat. It can be excavated with processing accuracy. Moreover, the contact pressure of the vibration suppression part with respect to the internal peripheral surface of a circular seat can be adjusted.
[0018]
According to invention of Claim 2, when a vibration suppression part is worn out, it suffices to replace only the vibration suppression part, and there is no need to replace the entire digging cutter. Therefore, maintenance costs can be reduced.
[Brief description of the drawings]
FIG. 1 is a perspective view of a counterboring cutter showing one embodiment.
FIG. 2 is a bottom view of a counterboring cutter.
3 is a cross-sectional view taken along line AA in FIG.
4 is a cross-sectional view taken along the line BB in FIG.
FIG. 5 is a perspective view showing a usage state of a counterboring cutter.
FIG. 6 is a perspective view showing another usage state of the counterboring cutter.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 3 ... Arm, 10 ... Screw (vibration suppression part), 13 ... Wood (drilling material), 15 ... Circular seat

Claims (2)

In a countersink cutter for excavating a circular seat on a work material, a vibration suppression unit that extends radially from the axis of rotation and has a plurality of arms having an excavating blade, and slides with respect to the circular seat on the outer peripheral surface of each arm The vibration suppressing part is constituted by a screw head, and the outer peripheral surface of the head is in contact with the inner peripheral surface of the circular seat . The counterboring cutter according to claim 1, wherein the vibration suppressing unit is detachable from the arm.

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