JP2005138272A - Rotating tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable easy drilling of concrete or the like under the roof with a drilling tool 2 by passing a mounting section for mounting the drilling tool 2 to the back side of a ceiling. <P>SOLUTION: The rotating tool comprises a cylindrical mounting body 4 where the drilling tool 2 having a locking section 7 formed in a shank section 3 is inserted into the tip side, and a locking means 8 for preventing removal of the punching tool 2 inserted into the mounting body 4. A cylindrical cutter 13 is disposed on the tip side of the mounting body 4, and the outer diameters of the mounting body 4 and the locking means 8 are set at the outer diameter of the cylindrical cutter 13 or shorter. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a rotary tool used when, for example, a hole is made in slab concrete behind a ceiling of a building.

In general, when installing an air conditioner, etc. on a suspended ceiling, before attaching a board (ceiling board) to the ceiling frame, drill an anchor in the concrete on which the ceiling frame, air conditioner, etc. are suspended, and drive an anchor into this anchor. After attaching the air conditioner, it was performed by attaching an air conditioner or the like to the hanger.
As a drilling method for making a hole in the concrete for suspending such a ceiling frame or the like, as shown in FIG. A drill 53 (drilling tool) is mounted on the part), and drilling is performed by pressing the drill 53 against the concrete 54 from below while integrally rotating the drill 53 and the relay shaft 51.
JP 2001-54837 A (FIG. 16)

However, when installing an air conditioner or the like on a suspended ceiling to which a board has been attached in advance, the mounting part for mounting the drilling tool is larger than the drilling tool. Without passing through the ceiling, it was impossible to make a hole in the concrete behind the ceiling, and the drilling work was very troublesome.
Accordingly, in view of the above problems, the present invention provides a rotary tool capable of passing a mounting portion for mounting a drilling tool through the back side of the ceiling and easily opening a hole in concrete or the like with the drilling tool. With the goal.

In order to achieve the above object, the present invention takes the following technical means.
That is, the technical means for solving the problems in the present invention include a cylindrical mounting body for inserting a drilling tool having a locking portion formed in the shank portion on the distal end side, and a removal of the drilling tool inserted in the mounting body. And an outer diameter of the mounting body and the locking means is set to be equal to or smaller than an outer diameter of the cylindrical cutter.
According to this, since the outer diameter of the mounting body and the locking means is set to be equal to or less than the outer diameter of the cylindrical cutter, for example, when making a hole in the concrete or the like on the back side of the suspended ceiling to which the board is previously attached, By making a hole in the board with a cylindrical cutter while the board is stuck, the mounting body and the locking means can be passed through the back side of the ceiling, so that the tip of the drilling tool can be put into the concrete on the back side of the ceiling. Since it can be abutted, a drilling operation can be performed. In addition, in this case, since the mounting body and the locking means can be passed by making a hole in the board with a cylindrical cutter, there is no need to peel off the board attached to the ceiling frame for the drilling work, and the drilling work is easy. Can be made. Further, since the drilling tool can be attached to and detached from the mounting body, the drilling tool can be replaced (replaced).

Another technical means for solving the problems in the present invention is that the locking means is provided on the mounting body so as to be movable in a radial direction, and engages with and disengages from the locking portion of the shank portion. A sliding body that is fitted so as to be freely movable in the axial direction and is movable between a position that prevents the engaging body from being detached from the locking portion and a position that allows the separation, and the sliding body is prevented from being detached. A biasing member for biasing to the position, and the outer diameters of the sliding body and the biasing member are set to be equal to or smaller than the outer diameter of the cylindrical cutter.
According to this, by placing the sliding body in the engagement body disengagement allowable position against the urging force of the urging member, it is possible to place the drilling tool on the mounting body, and the urging member engages the sliding body. By setting the union separation preventing position, the drilling tool can be mounted so as not to come off the mounting body, and the sliding body and the urging member can be passed through the ceiling in the drilling operation.

Another technical means for solving the problems in the present invention is that the cylindrical cutter is detachably provided on the mounting body, a plurality of cutting blades are provided on the distal end side of the cylindrical main body of the cylindrical cutter, It is in the point which provided the escape groove.
According to this, since the cylinder cutter is made detachable, the cylinder cutter can be replaced (replaced), and a hole or the like can be made in a board or the like attached to the ceiling by the cutting blade.
Another technical means for solving the problem in the present invention is that a relay shank having an outer diameter set to be equal to or smaller than the outer diameter of the mounting body is connected to the rear portion of the mounting body, and the tip mounting portion of the relay shank is connected to the drilling tool. It is in the point which can contact | abut with the rear end of the shank part.

According to this, it is possible to drill into concrete or the like in a high place by the relay shank, if the shank portion of the drilling tool abuts on the relay shank in the drilling operation, the tip of the drilling tool can be strongly pressed against the concrete, Drilling can be performed efficiently. Another technical means for solving the problems in the present invention is that the outer diameter of the cylindrical cutter is set to be not more than twice the outer diameter of the shank portion of the drilling tool.
According to this, when making a hole in the board affixed to the ceiling with the cylinder cutter in the drilling operation, the hole in the board can be reduced.

Another technical means for solving the problem in the present invention is that the cylindrical cutter is detachably screwed to the mounting body, and the cylindrical cutter is prevented from rotating with respect to the mounting body when the drilling tool is mounted on the mounting body. This is in that a detent means is provided.
According to this, by providing the anti-rotation means, it is possible to strengthen the mounting between the mounting body and the cylinder cutter.
Another technical means for solving the problems in the present invention is that the anti-rotation means includes an anti-rotation locking portion provided on the cylindrical cutter, and a mounting body that is provided so as to be movable in the radial direction and abuts against the shank portion. And a detent engagement body that can be engaged with and disengaged from the detent locking portion.

  According to this, only by mounting | wearing a mounting tool with a drilling tool, the latching part for rotation prevention and the engagement body for rotation prevention can be engaged.

  The mounting portion on which the drilling tool is mounted can be passed through the back side of the ceiling, and a hole can be made in the concrete on the back of the ceiling with this drilling tool.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, a first embodiment of the invention will be described with reference to the drawings.
FIG. 1 is a side sectional view in which a drilling tool is mounted on the rotary tool of the present invention.
The rotary tool 1 is a tool for drilling by mounting a drilling tool 2 such as a drill on a mounting body 4 and rotating the drilling tool 2 together with the mounting body 4.
As shown in FIGS. 1 to 3, a pair of fitting recesses 5 for fitting the shank portion 3 of the drilling tool 2 to the mounting body 4 are provided on the outer peripheral surface of the shank portion 3 of the drilling tool 2 to be attached to the rotary tool 1. Is formed. This fitting recessed part 5 is comprised from the groove | channel extended in the axial direction from the middle part to the rear part of the shank part 3, and each this fitting recessed part 5 is arrange | positioned at intervals of 180 degree | times, respectively.

On the outer peripheral surface of the shank portion 3 between the pair of fitting recesses 5, a locking portion 7 that engages with an engaging body 6 provided on the mounting body 4 is formed. The locking portion 7 is formed by a groove having a substantially circular shape in cross section extending from the middle portion to the rear side of the shank portion 3, and the engaging body 6 is engaged at both axial ends of the locking portion 7. In this case, the contact portion can be brought into contact with the engaging body 6.
The fitting recesses 5 and the locking portions 7 are alternately arranged in the shank portion 3 at an interval of approximately 90 degrees.
The mounting body 4 to which the drilling tool 2 is mounted is formed in a circular cylindrical shape so that the drilling tool 2 can be inserted from its tip, and the inner diameter of the mounting body 4 is slightly larger than the outer diameter of the shank portion 3 of the drilling tool 2. It is set large.

The outer diameter from the midway part to the tip part of the mounting body 4 is formed smaller than the outer diameter from the midway part to the rear part, whereby the step part 10 is formed in the midway part of the mounting body 4.
A cylindrical sliding body 11 is externally fitted to the small diameter portion 4a whose outer diameter is smaller than the rear side so that the mounting body 4 can come into contact with the stepped portion 10. The outer diameter of the sliding body 11 is the mounting body 4. The outer diameter of the large-diameter portion 4b larger than the small-diameter portion 4a is set to be approximately the same.
A coil spring 12 (urging member), which is an elastic member, is fitted on the middle portion of the small diameter portion 4 a of the mounting body 4, and the rear end of the coil spring 12 is in contact with the front end side of the sliding body 11. . The outer diameter of the coil spring 12 is set to be equal to or smaller than the outer diameter of the large diameter portion 4 b of the mounting body 4.

A cylindrical tube cutter 13 is detachably screwed to the distal end portion of the small diameter portion 4 a of the mounting body 4, that is, the distal end portion of the mounting body 4, and the outer diameter of the cylindrical cutter 13 is the small diameter portion of the mounting body 4. 4a, the large diameter portion 4b, the sliding body 11, and the outer diameter of the coil spring 12 are set.
That is, the outer diameters of the mounting body 4, the sliding body 11, and the coil spring 12 are set to be equal to or smaller than the outer diameter of the cylindrical cutter 13.
As shown in FIG. 3, a pair of fitting convex portions 14 into which the fitting concave portions 5 of the shank portion 3 are fitted are formed on the inner peripheral surface of the substantially central portion of the mounting body 4. Are arranged at intervals of 180 degrees.

Therefore, the perforating tool 2 is rotated together with the mounting body 4 by fitting the fitting concave portion 5 to the fitting convex portion 14.
Between the pair of fitting projections 14, a through hole 17 that penetrates the mounting body 4 in the radial direction is provided. That is, one through hole 17 is provided in the small diameter portion 4 a of the mounting body 4 to which the sliding body 11 is fitted, and the spherical engagement body 6 (spherical ball) is inserted into the through hole 17.
The diameter of the through hole 17 on the inner side in the mounting body radial direction is set to be slightly smaller than the outer diameter of the engagement body 6. That is, an annular convex portion 18 that can contact the outer peripheral surface of the engaging body 6 is formed on the inner peripheral edge of the through hole 17 on the inner diameter side of the mounting body, and when the engaging body 6 is inserted into the through hole 17 The engaging body 6 is prevented from coming out of the mounting body 4.

The outer diameter of the through hole 17 in the mounting body radial direction is set to be approximately the same as the outer diameter of the engaging body 6, and the engaging body 6 can be inserted into the through hole 17 from the outer side of the mounting body 4. .
Therefore, the engaging body 6 inserted through the through hole 17 is movable in the mounting body radial direction, and the movement of the engaging body 6 is restricted by contacting the annular convex portion 18 or the sliding body 11.
The sliding body 11 is free to move in the axial direction by sliding the outer peripheral surface and the tip end side of the mounting body 4. The thickness of the rear portion of the sliding body 11 is set to be slightly smaller than that of the distal end portion, whereby an allowable portion 19 that allows the engagement body 6 to move is formed at the rear portion of the sliding body 11.

The front end portion side of the sliding body 11 having a wall thickness larger than that of the allowable portion 19 is a blocking portion 20 that blocks the movement of the engaging body 6, and the blocking portion 20 of the sliding body 11 is located on the outer side of the through hole 17. When it is located, the movement of the engagement body 6 is prevented and the engagement body 6 stays at the same position. When the allowable portion 19 of the sliding body 11 is located on the outer side of the through hole 17, the movement of the engagement body 6 is prevented. Allowed, the engaging body 6 is movable in the radial direction of the mounting body 4. The inner diameter of the allowing portion 19 is larger than the inner diameter of the blocking portion 20.
The sliding body 11 is normally urged so that the blocking portion 20 of the sliding body 11 is located on the outer side of the through-hole 17 by the spring of the coil spring 12, and in this state (the blocking portion of the sliding body 11). In a state in which 20 is located outside the through-hole 17), the engaging body 6 projects inward from the inner peripheral surface of the mounting body 4.

In order to attach the drilling tool 2 to the rotary tool 1 with the above configuration, first, the drilling tool 2 is inserted from the distal end side of the mounting body 4, and the fitting recess 5 of the shank portion 3 is inserted into the fitting convexity of the mounting body 4. Fit into part 14.
Then, as shown in FIG. 2, the sliding body 11 is moved forward against the elastic force of the coil spring 12 so that the allowable portion 19 of the sliding body 11 is located on the outer side of the through hole 17. After that, the locking part 7 of the shank part 3 is moved to the engagement position (position where the through-hole 17 and the locking part 7 wrap) and slid forward against the extension force of the coil spring 12. This can be done by separating the sliding body 11.

  As can be seen from this, the engagement body 6 can move if the allowance portion 19 of the sliding body 11 is positioned outside the through-hole 17 against the elastic force of the coil spring 12. The stop portion 7 can be moved to the locking position, and in this state (the locking portion 7 of the shank portion 3 is moved to the position where the through hole 17 wraps), the engagement body 6 is moved into the mounting body 4. If the sliding body 11 is moved by the coil spring 12 so that it protrudes from the peripheral surface, that is, the blocking portion 20 of the sliding body 11 is positioned outside the through hole 17, the engaging body 6 is engaged with the locking portion 7. Can be engaged.

When the blocking portion 20 of the sliding body 11 is positioned outside the through-hole 17 in the engaged state, the engaging body 6 contacts the blocking portion 20 of the sliding body 11 and also contacts the annular convex portion 18. Since the movement is prevented, the engagement state of the engagement body 6 is maintained, the drilling tool 2 moves in the axial direction within the range of the length of the locking portion 7, and the drilling tool 2 is not detached from the mounting body 4. Absent.
And if the allowance part 19 of the sliding body 11 is located in the outer side of the through-hole 17, the engagement body 6 will be movable to the allowance part 19 side, the engagement state of the engagement body 6 will be cancelled | released, and the drilling tool 2 will be mounted | worn It can be removed from the body 4.

That is, the sliding body 11 has a position where the engaging body 6 is prevented from being detached from the locking portion 7 (the blocking portion 20 of the sliding body 11 is located outside the through hole 17) and a position where the sliding body 11 is allowed to be separated (the sliding body 11). The mounting member 4 is movable between the permissible portion 19 and the perforation hole 17. The engaging body 6 can be engaged with and disengaged from the locking portion 7 by the movement of the sliding body 11.
Therefore, the rotary tool 1 is provided with a locking means 8 for preventing the drilling tool 2 inserted into the mounting body 4 from coming off, and the locking means 8 can be engaged with and disengaged from the locking part 7 of the shank part 3. The engaging body 6 includes a sliding body 11 that is movable in the axial direction with respect to the mounting body 4, and a biasing member 12 that biases the sliding body 11 to the separation preventing position. A drilling tool 2 having a detachable position is made detachable.

The cylinder cutter 13 provided on the front end side of the mounting body 4 is formed of a metal-based material or the like, and perforates a gypsum board 24 (board) affixed to the ceiling 23, vinyl chloride, slate, wood, or the like. , Has a corresponding strength.
The cylinder cutter 13 is composed of a cylinder main body 25 formed in a cylindrical shape, and the outer diameter of the cylinder main body 25 (the outer diameter of the cylinder cutter 13) is set to not more than twice the outer diameter of the shank portion 3 of the drilling tool 2. Has been.
Specifically, since the outer diameter of the shank portion 3 of the drilling tool 2 (drill) is usually set to 10 mm, the outer diameter of the shank portion 3 is set to 10 mm in this embodiment. ing.

On the other hand, most anchors used to suspend lighting fixtures, air conditioners, etc. can be driven when the diameter (diameter) of the lower hole of the anchor is around 12 mm. Most often, a drilling tool 2 (drill) having a (diameter) of 12 mm to 13 mm is used.
Therefore, in this first embodiment, it is assumed that the drilling tool 2 having a drilling diameter of about 12 mm to 13 mm and an outer diameter of the shank portion 3 of the drilling tool 2 of 10 mm is attached. The outer diameter of the main body 25 is set to 19 mm, which is 1.9 times the outer diameter of the shank portion 3. Note that the outer diameter of the cylinder body 25 includes a tip diameter D (diameter dimension) of a cutting blade 27 described later.

The length of the cylinder body 25 is set such that the tip of the cylinder body 25 does not protrude beyond the tip (base end) of the shank part 3 of the drilling tool 2 when the drilling tool 2 is attached to the mounting body 4. ing. In other words, the length of the cylinder body 25 is such that when the drilling tool 2 is attached to the mounting body 4, the tip of the cylinder body 25 does not protrude in the axial direction from the rear end of the drilling part 26 of the drilling tool 2. The length of the cylinder main body 25 is set to the extent that the cylinder main body 25 and the perforated portion 26 do not overlap in the axial direction in a side view.
A female screw is cut on the inner peripheral surface of the rear portion of the cylinder body 25, and the cylinder body 25 is screwed into a male screw formed at the distal end portion of the mounting body 4, so that the cylinder body 25 has a small diameter portion of the mounting body 4. It is attached to 4a.

A plurality of cutting blades 27 are provided on the distal end side of the cylinder body 25 in the circumferential direction. Each cutting edge 27 is arranged at an interval of about 180 degrees, and an escape groove 28 is provided on the leading side in the rotational direction of each cutting edge 27. The escape groove 28 extends from the distal end portion of the tube main body 25 to a substantially central portion of the tube main body 25.
In the above description, the outer diameter of the cylindrical cutter 13 is set to be larger than the outer diameters of the mounting body 4, the sliding body 11, and the urging member 12. In other words, the outer diameter of the mounting body 4, the sliding body 11, and the biasing member 12 is set to be smaller than the tip diameter D of the cutting edge 27. Yes.

The rotary tool 1 has a detachable relay shank 30 at the rear part of the mounting body 4, and the length of the relay shank 30 is set longer than the length of the mounting body 4. The relay shank 30 rotates the mounting body 4 and can be integrally rotated when the mounting body 4 is mounted.
The front end portion side of the relay shank 30 is a large diameter portion 30a having the largest diameter (width), and a small diameter portion having a diameter (width) smaller than that of the large diameter portion 30a from the midway portion to the rear end portion. Yes.
The outer diameter (width) of the large diameter portion 30 a of the relay shank 30 is set smaller than the outer diameter of the cylindrical cutter 13. That is, the outer diameter of the relay shank 30 is set smaller than the outer diameter of the cylindrical cutter 13.

On the front end side of the relay shank 30, a circular protrusion 31 (front end mounting portion) that connects the relay shank 30 to the rear portion of the mounting body 4 is formed. The protruding portion 31 protrudes from the large-diameter portion 30a toward the mounting body 4, and the outer diameter (width) of the protruding portion 31 is set smaller than that of the large-diameter portion 30a.
A male screw is cut on the outer peripheral surface of the protrusion 31, and the male shank of the relay shank 30 is screwed into the female screw formed on the inner peripheral surface of the rear part of the mounting body 4, whereby the relay shank 30 is attached to the mounting body 4. It can be detachably attached to.

The length of the protrusion 31 is set such that when the relay shank 30 is attached to the mounting body 4, the tip of the protrusion 31 does not overlap with the through-hole 17. Is located in the large diameter portion 4b. When the drilling tool 2 is attached to the mounting body 4, the protrusion 31 can come into contact with the rear part of the drilling tool 2 (the rear part of the shank part 3), and the rear part of the drilling tool 2 is connected to the relay shank 30. When abutting against the protruding portion 31, the locking portion 7 of the shank portion 3 can be moved to the through hole position.
Therefore, when the drilling tool 2 is attached to the mounting body 4, the axial positioning of the locking portion 7 of the shank part 3 of the drilling tool 2 can be easily performed simply by bringing the rear part of the drilling tool 2 into contact with the protrusion 31. The engaging body 6 can be easily engaged with the locking portion 7.

Note that the rear end portion of the relay shank 30 can be attached to and detached from, for example, a chuck portion of an electric power tool that rotates.
In order to make a hole in the concrete 32 (slab concrete) on the suspended ceiling 23 using the rotary tool 1, the rear part of the relay shank 30 is attached to the rotary drive machine, and the tip of the relay shank 30 is attached to the mounting body 4. As shown in FIG. 5, the drilling tool 2 is attached to the mounting body 4, and the relay shank 30, the mounting body 4, and the drilling tool 2 are rotated to open a hole in the board 24 attached to the ceiling 23 with the drilling tool 2. This can be done by making a hole in the board 24 with the cylinder cutter 13, passing the drilling tool 2 and the mounting body 4 on the back side of the ceiling 23, and abutting the drilling tool 2 against the concrete 32 on the back side of the ceiling 23.

At this time, since the outer diameter of the cylindrical cutter 13 is set to be equal to or larger than the outer diameter of the mounting body 4 and the locking means 8, the mounting body 4 and the locking means 8 can be passed through the back side of the ceiling 23. Thus, the tip of the drilling tool 2 can be brought into contact with the concrete 32.
Further, since the mounting body 4 and the locking means 8 are passed through the back side of the ceiling 23 by making a hole in the board 24 affixed to the ceiling 23 with the cylinder cutter 13, the board 24 is peeled off as in the conventional case. There is no need and the drilling operation is very simple.
Further, since the shank portion 3 of the drilling tool 2 can be brought into contact with the relay shank 30 in the drilling operation, if the drilling tool 2 is brought into contact with the protruding portion 31, the tip of the drilling tool 2 can be strongly pressed against the concrete 32 or the like. Can be drilled efficiently.

Next, a second embodiment of the rotary tool according to the present invention will be described.
As shown in FIGS. 7 and 8, the mounting body 4 of the rotary tool 1 is provided with a plurality of engaging bodies 6 that can be engaged and disengaged with the engaging portions 7 of the drilling tool 2 so as to be movable in the radial direction. Specifically, two through holes 17 are provided at intervals of 180 degrees between the pair of fitting convex portions 14, and the spherical engagement bodies 6 are inserted into the respective through holes 17.
7 to 9 according to the second embodiment, the same reference numerals as those in the first embodiment are the same as those in the first embodiment, and the description thereof is omitted.

On the inner peripheral surface of the substantially central portion in the axial direction of the cylinder main body 25 (cylinder cutter 13), there is provided a projection 34 projecting radially inward, and the inner peripheral surface on the rear side in the axial direction from the projection 34. Has a female thread.
An unthreaded threaded portion is formed on the rear side in the axial direction from the threaded portion 35 where the internal thread is threaded. An arc-shaped detent locking portion 37 is formed on the threaded portion. It is formed in an annular shape.
As shown in FIGS. 7 and 9, a plurality (three) of penetrating through the mounting body 4 (the mounting body 4 inside the locking part 37 for rotation prevention) corresponding to the locking part 37 for rotation prevention. Through-holes 38 are provided, and the respective through-holes 38 are arranged at intervals of 120 degrees in the circumferential direction.

A spherical anti-rotation engagement body 39 is inserted into each through-hole 38 so as to be movable in the radial direction, and the anti-rotation engagement body 39 can protrude from either the inner peripheral surface or the outer peripheral surface of the mounting body 4. It has become.
On the inner peripheral edge of the through hole 38, an annular convex portion 40 that can contact the outer peripheral surface of the anti-rotation engagement body 39 is formed.
Therefore, the anti-rotation engagement body 39 is supported by the mounting body 4 so as to be movable in the radial direction between the annular convex portion 40 and the anti-rotation locking portion 37, and the anti-rotation engagement body 39 is The stop portion 37 can be freely engaged and disengaged.

The inner diameter of the inner peripheral edge of the through hole 38 is slightly smaller than the outer diameter of the anti-rotation engagement body 39 by the annular convex portion 40, whereby each of the anti-rotation engagement bodies 39 is arranged on the inner peripheral surface of the mounting body 4. It is possible to protrude in the radially inward direction.
A male screw is cut on the outer peripheral surface of the mounting body 4 on the tip side from the through hole 38, and the cylindrical cutter 13 can be attached to and detached from the mounting body 4 by screwing the male screw and the female screw of the cylindrical cutter 13. Is attached.
When the cylindrical cutter 13 is attached to the mounting body 4, the projection 34 of the cylindrical cutter 13 and the tip of the mounting body 4 come into contact with each other. The positioning with the engaging body 39 (through hole 38) can be easily performed.

In addition, when the cylindrical cutter 13 is used, the impact applied to the cylindrical cutter 13 is received by the distal end portion of the mounting body 4 via the protrusion 34, so that the burden on the cylindrical cutter 13 and the screw portion 35 of the mounting body 4 is reduced. Is possible.
As shown in FIG. 9, when the drilling tool 2 is mounted on the mounting body 4, the diameter of the mounting body 4 is such that the cylindrical portion 3 a of the shank portion 3 of the drilling tool 2 can block the through hole 38. Is set to be approximately the same as the outer diameter of the cylindrical portion 3 a of the shank portion 3 of the drilling tool 2.
According to the configuration described above, when the drilling tool 2 is not inserted into the mounting body 4, the anti-rotation engaging body 39 is movable in the radial direction so that it protrudes to either the inside or the outside of the mounting body 4. However, when the drilling tool 2 is inserted into the mounting body 4, the shank portion 3 is located inside the through hole 38 and closes the inside of the through hole 38. Is pushed out to the outer peripheral surface of the mounting body 4 and is engaged with the locking stopper 37 for rotation prevention.

At this time, since the inside of the through hole 38 is closed by the shank portion 3, the anti-rotation engagement body 39 abuts against the outer peripheral surface of the shank portion 3 and is prevented from moving in the radial direction. The engaged state of the united body 39 is maintained.
Therefore, when the drilling tool 2 is mounted on the mounting body 4, the anti-rotation engaging body 39 and the anti-rotation locking portion 37 are always in an engaged state, whereby the cylinder cutter 13 cannot move in the axial direction. Therefore, the cylinder cutter 13 screwed into the mounting body 4 does not rotate with respect to the mounting body 4.

As can be seen, the rotary tool 1 is provided with a detent means 41 for preventing the cylinder cutter 13 from rotating with respect to the mounting body 4 when the drilling tool 2 is mounted on the mounting body 4. Reference numeral 41 denotes an anti-rotation locking portion 37 provided on the cylinder cutter 13 and an attachment body 4 which is provided so as to be movable in the radial direction so as to be able to contact the shank portion 3 and to be engaged with and disengaged from the anti-rotation locking portion 37. And a possible anti-rotation engagement body 39.
As described above, according to the second embodiment, when the drilling tool 2 is mounted on the mounting body 4, the cylindrical cutter 13 can be prevented from being rotated (prevented from coming off), and the mounting of the mounting body 4 and the cylindrical cutter 13 can be strengthened. can do.

Furthermore, since the three anti-rotation engagement bodies 6 engage with the anti-rotation locking portion 7 of the cylinder cutter 13 during mounting, the cylinder cutter 13 can be more reliably prevented from rotating.
In addition, the anti-rotation locking portion 41 and the anti-rotation engagement body 39 can be engaged only by attaching the drilling tool 2 to the attachment body 4.
The rotary tool 11 according to the present embodiment is not limited to the above embodiment. That is, the length of the relay shank 30 is set such that, for example, when a hole is made in the slab concrete 32 behind the ceiling 23, a drilling operator having a general length of a commercially available drill (300 mm or less) stands in the soil. It is preferable to set the length sufficiently long so that the drilling operation can be performed in the above state.

Further, the cylinder cutter 13 is used for drilling a board 24, vinyl chloride, slate, wood, etc., but is not limited thereto, and may be used for drilling concrete, stone, metal, etc. May be perforated.
Further, the urging member 12 is constituted by a coil spring. However, any member may be used as long as it urges the sliding body 11 to the engagement body 6 disengagement preventing position by an elastic force. It may be.
Moreover, it is preferable that the outer diameter of the cylinder cutter 13 is slightly larger than the mounting body 44, the sliding body 11, and the coil spring 12, for example, it is preferable to make it 1 mm larger than these.

It is side surface sectional drawing which attached the drilling tool 2 to the rotary tool 1 of 1st Embodiment of this invention. It is side surface sectional drawing before attaching the drilling tool 2 to the rotary tool 1. FIG. It is XX sectional drawing of FIG. 2 is a front view of the rotary tool 1. FIG. It is drilling explanatory drawing which makes a hole in slab concrete using the rotary tool. It is conventional drilling work explanatory drawing. It is side surface sectional drawing which attached the drilling tool 2 to the rotary tool 1 of 2nd Embodiment of this invention. It is YY sectional drawing of FIG. It is ZZ sectional drawing of FIG.

Explanation of symbols

1 Rotating tool 1
2 Drilling tool 2
3 Shank 3
4 Wearing body 4
6 Engagement body 6
7 Locking part 7
8 Locking means 11 Sliding body 12 Biasing member 13 Tube cutter 13
25 Cylindrical body 27 Cutting blade 28 Escape groove 30 Relay shank 37 Anti-rotation locking portion 39 Anti-rotation engagement body 41 Anti-rotation means

Claims (7)

  A cylindrical mounting body for inserting and rotating a drilling tool having a locking portion formed in the shank portion at the distal end side, and a locking means for preventing the drilling tool inserted in the mounting body from being removed, A rotary tool characterized in that a cylindrical cutter is provided on the distal end side of the mounting body, and the outer diameters of the mounting body and the locking means are set to be equal to or smaller than the outer diameter of the cylindrical cutter.   The locking means is provided on the mounting body so as to be movable in the radial direction, and engages with and disengages from the locking portion of the shank portion. A sliding body that is movable between a position that prevents separation from the stopping portion and a position that allows separation, and a biasing member that biases the sliding body to an engagement body separation preventing position. The rotating tool according to claim 1, wherein the outer diameter of the moving body and the biasing member is set to be equal to or smaller than the outer diameter of the cylindrical cutter.   3. A cylinder cutter is provided on a mounting body so as to be detachable, a plurality of cutting blades are provided on a tip end side of a cylinder main body of the cylinder cutter, and a relief groove is provided on a rotation direction leading side of the cylinder main body. A rotating tool as described in 1.   A relay shank whose outer diameter is set to be equal to or smaller than the outer diameter of the mounting body is connected to the rear part of the mounting body, and the front end mounting part of the relay shank can be brought into contact with the rear end of the shank part of the drilling tool. The rotary tool according to any one of claims 1 to 3, wherein   The rotary tool according to any one of claims 1 to 4, wherein an outer diameter of the cylindrical cutter is set to be not more than twice an outer diameter of a shank portion of a drilling tool.   The cylindrical cutter is detachably screwed to the mounting body, and is provided with a detent means for preventing the cylindrical cutter from rotating relative to the mounting body when the drilling tool is mounted on the mounting body. The rotary tool according to any one of claims 1 to 5.   The anti-rotation means includes an anti-rotation locking portion provided on the cylinder cutter, and is provided on the mounting body so as to be movable in the radial direction, can contact the shank portion, and can be engaged with and disengaged from the anti-rotation locking portion. The rotary tool according to claim 6, further comprising an anti-rotation engagement body.

Images