JP6298201B1 - Core drill device and positioning device in core drill device - Google Patents

Abstract

A core drill device and a positioning tool in the core drill device capable of dealing with a wide range of workpieces and capable of increasing the degree of freedom of the height position for drilling the workpiece. A core drill device (1) includes a base (3), a support column (4) provided on the base (3), a core drill unit (5) supported by the support column (4) and movable along the longitudinal direction of the support column (4), and a work piece (2). A positioning device 6 for determining the height position of the core drill unit 5 is provided. The positioning device 6 includes a fixed member 20 to which the base 3 is fixed above the workpiece 2 and fixing means (clamp members 26A and 26B) for fixing the fixed member 20 to the workpiece 2. Including. [Selection] Figure 1

Description

  The present invention relates to a core drill device for drilling a workpiece and a positioning device in the core drill device.

  A core drill device is known as a device for drilling solid materials (hereinafter referred to as “workpieces”) such as concrete structures, blocks, stones, bedrock, tiles, and steel structures (see, for example, Patent Document 1). ). In the core drill apparatus exemplified in Patent Document 1, a base fixed to one end of a column is fixed to a work piece by an anchor bolt, and the drill head is movably supported by the column.

  In the drilling operation, the operator operates the handle to move the drill head along the support column, and presses the core bit attached to the drill head against a predetermined portion of the work. In this state, when the operator drives the motor, the core bit rotates and drills the work.

Japanese Patent No. 3158048

  However, the prior art including Patent Document 1 has the following problems due to the installation mode of the core drill device with respect to the work. In other words, the work is drilled in a substantially horizontal direction depending on the application, etc.In this case, the column is fixed to the work through the base so that the longitudinal direction is substantially horizontal, and the drill head is Considering its own weight, it is supported so as to be movable below the column. The base fixed to the support is generally rectangular, and the back surface of the base is aligned so as to cover a predetermined range of the work piece, and the openings formed near the four corners of the base are formed. The base is fixed to the work piece by inserting the anchor bolt into the hole formed in the work piece.

  For this reason, for example, even if an attempt is made to drill in the horizontal direction from a height position close to the upper surface of the workpiece, drilling from the height position becomes difficult if there is no space for fixing the base to the workpiece. As described above, the conventional core drill apparatus has a problem in that there is a limit to the height position where drilling is possible.

  Then, an object of this invention is to provide the core drill apparatus which can raise the freedom degree of the height position drilled with respect to a workpiece, and the positioning tool in a core drill apparatus.

The core drill device of the present invention is a core drill device for drilling a workpiece, and a core drill unit that is supported by the base, the column provided on the base, and supported by the column, and is movable along the longitudinal direction of the column. And positioning means for determining a height position of the core drill unit with respect to the workpiece, the positioning means including a fixed member to which the base is fixed above the workpiece, and the fixed member Fixing means for fixing the workpiece to the workpiece, and the fixing means includes a plurality of clamping means for clamping the workpiece from the front and the rear, and the fixed member includes the plurality of fixing members. said through clamping means is fixed relative to the work object, wherein the positioning means includes a lifting member movable up and down relative to the base is fixed and the member to be fixed, of the fixation member Further comprising a lifting means for lifting the lifting member in the way.

The positioning tool in the core drill device of the present invention is a core drill device comprising a base, a support provided on the base, and a core drill unit supported by the support and movable along the longitudinal direction of the support. A positioning device in a core drill device for determining a height position of the core drill unit with respect to a workpiece, the fixed member to which the base is fixed above the workpiece, and the fixed member to the workpiece Fixing means for fixing to the workpiece, the fixing means having a plurality of clamping means for clamping the workpiece from the front and rear, and the fixed member is the plurality of clamping means. is fixed with respect to the workpiece material through the lifting member movable up and down relative to the base is fixed and the member to be fixed under the fixation member In further comprising a lifting means for lifting the lifting member.

  ADVANTAGE OF THE INVENTION According to this invention, the freedom degree of the height position drilled with respect to a workpiece can be raised.

The whole perspective view of the core drill apparatus in one embodiment of the present invention The disassembled perspective view of the positioning tool with which the core drill apparatus in one embodiment of this invention is provided. The front view of the core drill apparatus in one embodiment of this invention (A) (b) Explanatory drawing of the positioning method of the core drill unit with which the core drill apparatus in one embodiment of this invention is provided. (A) (b) Explanatory drawing of the positioning method of the core drill unit with which the core drill apparatus in one embodiment of this invention is provided. Explanatory drawing of the positioning method of the core drill unit with which the core drill apparatus in one embodiment of this invention is provided Explanatory drawing of the positioning method of the core drill unit with which the core drill apparatus in one embodiment of this invention is provided (A) (b) Explanatory drawing of the drilling operation | work by the core drill apparatus in one embodiment of this invention Explanatory drawing of the positioning method of the core drill unit with which the core drill apparatus in one embodiment of this invention is provided Explanatory drawing of the positioning method of the core drill unit with which the core drill apparatus in one embodiment of this invention is provided Explanatory drawing of the positioning method of the core drill unit with which the core drill apparatus in one embodiment of this invention is provided Explanatory drawing of the positioning method of the core drill unit with which the core drill apparatus in one embodiment of this invention is provided Explanatory drawing of the drilling operation | work by the core drill apparatus in one embodiment of this invention (A) (b) (c) Explanatory drawing of the operation | work which determines the angle of the support | pillar in one embodiment of this invention Explanatory drawing of the drilling operation | work by the core drill apparatus in one embodiment of this invention

  First, a core drill apparatus according to an embodiment of the present invention will be described with reference to FIG. The core drill device 1 is a device for drilling a workpiece 2 such as a concrete structure, a block, a U-shaped side groove, etc., and is movable along the base 3, the support 4 provided on the base 3, and the support 4. A core drill unit 5 to be supported and a positioning device 6 for determining the height position of the core drill unit 5 in a state of being supported by the support column 4 are configured. In the present embodiment, a block is exemplified as the work 2. In this specification, one horizontal direction is defined as an X-axis direction, a direction orthogonal to the X-axis direction in a horizontal plane is defined as a Y-axis direction, and a direction orthogonal to the XY plane is defined as a Z-axis direction.

  The base 3 has a substantially rectangular shape in plan view, for example, and an opening 7 is formed through the longitudinal direction of the column 4 at a substantially central position. The opening 7 extends in one direction with respect to the base 3. A screw shaft 9 used when the base 3 is fixed to the positioning device 6 is inserted into the opening 7. A screw groove (male screw) is spirally formed on the outer peripheral surface of the screw shaft 9. In the four corner portions of the base 3, openings 8 that penetrate along the longitudinal direction of the support column 4 are formed. A female screw (not shown) is engraved on the base 3 along the inner peripheral surface of the opening 8.

  The support column 4 extends from the base 3 and is integrally formed with the base 3 by welding, for example. A rack 11 is formed on one side surface of the column 4 along the longitudinal direction.

  The core drill unit 5 includes a core drill body 12. The core drill body 12 is formed with an opening 12a through which the column 4 can be inserted and removed, and a pinion 13 that engages with the rack 11 is provided inside. A handle 15 is attached to one end of a shaft portion 14 that rotatably supports the pinion 13. When the operator rotates the handle 15 around the shaft portion 14 in a predetermined direction, the pinion 13 rotates. Thereby, the core drill main body 12 moves relative to the said support | pillar 4 along the longitudinal direction of the support | pillar 4 (arrow a).

  A core bit 16 is attached to the core drill body 12. The core bit 16 is a cylindrical member opened on the end 16a side that contacts the workpiece 2 (FIG. 1), and a shaft portion 18 that rotates in synchronization with a shaft of a drive motor 17 attached to the core drill body 12; It is connected. When the operator drives the drive motor 17, the core bit 16 is driven to rotate about the shaft portion 18 with respect to the core drill body 12 (arrow b). Thus, the core bit 16 is rotatably connected to the core drill body 12.

  Next, the positioning device 6 will be described with reference to FIGS. 1 and 2. The positioning device 6 includes a fixed member 20 to which the base 3 is fixed. The fixed member 20 is made of, for example, metal, and includes a plate-like portion 20a, a folded portion 20b folded from both sides of the plate-like portion 20a in a direction orthogonal to the plate-like portion 20a, and a rear lower portion of the folded portion 20b. The extending portion 20c is configured to extend. The fixed member 20 is placed in a “standing position” above the work 2 by bringing the lower surface of the plate-like portion 20a, the folded portion 20b, and the extending portion 20c into contact with the upper surface of the work 2.

  A plurality of openings having a size corresponding to a cross-sectional shape in a direction orthogonal to the longitudinal direction of the screw shaft 9 on a straight line connecting the midpoints on the short side of the plate-like portion 20a and capable of inserting and removing the screw shaft 9 The part 21 is formed side by side in the vertical direction. The number of openings 21 may be arbitrary. The folded portion 20b is provided with a substantially L-shaped bracket 22 that protrudes forward from the plate-like portion 20a and extends downward. A nut member 23 is fixed to the lower end portion of the bracket 22.

  A slide member 24 that is slidable along the longitudinal direction is attached to the extending portion 20c. An opening 24a is formed at one end of the slide member (FIG. 2), and an extension 20c is inserted into the opening 24a. A nut member 25 aligned in the vertical direction is fixed to the slide member 24 at a position below the extending portion 20c. The nut members 23 and 25 are opened in a direction in which clamp members 26 </ b> A and 26 </ b> B described later sandwich the work 2.

  Clamp members 26A and 26B are mounted on the nut members 23 and 25, respectively. The clamp members 26A and 26B include a shaft portion 26a in which a male screw is engraved on the outer peripheral surface and screwed into the nut members 23 and 25, and a pressing portion 26b attached to one end of the shaft portion 26a and formed of an elastic body such as rubber. And a gripping portion 26c that is attached to the other end of the shaft portion 26a and is gripped by an operator. The clamp members 26A and 26B are attached to the nut members 23 and 25 so that the pressing portion 26b faces each other.

  When the work piece 2 is interposed between the clamp members 26A and 26B, the operator operates the clamp members 26A and 26B to move them in directions in which the work pieces 2 approach each other. Press down. Accordingly, the work 2 is sandwiched from the front and rear by the clamp members 26 </ b> A and 26 </ b> B, and the fixed member 20 can be fixed to the work 2. That is, the clamp members 26 </ b> A and 26 </ b> B are fixing means (first fixing means) for fixing the fixed member 20 to the workpiece 2. Further, the fixing means has clamp members 26A and 26B (clamping means) for sandwiching the workpiece 2 from the front and rear, and the workpiece 20 is fixed to the workpiece 2 via the clamp members 26A and 26B. Fixed. The fixing means is not limited to this. For example, an anchor bolt (not shown) may be screwed into the nut members 23 and 25, and the anchor bolt may be inserted into a hole formed in advance in the workpiece 2 and fixed. However, according to the method of fixing the member 20 to be fixed by the clamp member 26, it is not necessary to form the above-described hole in the work piece 2, which is effective in terms of aesthetics. Moreover, according to the clamp member 26, the base 3 can be fixed with sufficient strength even to the work 2 having a small width in the thickness direction. That is, the fixing by the clamp member 26 can correspond to the drilling of the workpiece 2 of various sizes.

  A nut member 27 is fixed to an upper position on the front surface 20a1 side of the plate-like portion 20a in a state where the nut member 27 is opened in the vertical direction. A long screw shaft 28 having a screw groove (male screw) formed in a spiral shape on the outer peripheral surface is screwed onto the nut member 27. The lower end portion of the screw shaft 28 is chucked by a cap 29 (FIG. 2).

  An elevating member 30 is disposed at a position below the fixed member 20 so as to be movable up and down. A cylindrical member 31 is fixed to the back surface 30 a side of the elevating member 30, and a screw shaft 28 is inserted into the cylindrical member 31. The screw shaft 28 rotates relative to the cylindrical member 31. Since the lower end portion of the screw shaft 28 is chucked by the cap 29, the cylindrical member 31 cannot be removed from the lower end portion of the screw shaft 28. By rotating the screw shaft 28 in a predetermined direction (arrow c shown in FIG. 1), the lifting member 30 moves up and down with respect to the fixed member 20 (arrow d).

  In FIG. 2, a pair of rail members 32 extending upward are provided on both sides of the back surface 30 a of the elevating member 30. Guide members 33 having openings 33a through which the rail members 32 can be inserted and removed in the vertical direction are provided on both sides of the front surface 20a1 of the plate-like portion 20a and at positions corresponding to the pair of rail members 32. A plurality of guide members 33 are provided with different height positions on each side of the plate-like portion 20a.

  In FIG. 1, the elevating member 30 can be raised and lowered using, for example, a hand-type electric tool 34. The electric tool 34 is mainly composed of a tool main body 35 containing a drive motor (not shown), and a socket bit 37 is mounted via a bit holder 36. The operator screws a nut member (not shown) from above the screw shaft 28 and fits the socket bit 37 to the nut member. In this state, the operator operates the electric tool 34 and rotates the socket bit 37 in the forward direction, so that the screw shaft 28 is lowered together with the elevating member 30. Further, the operator operates the electric tool 34 to rotate the socket bit 37 in the reverse direction, so that the screw shaft 28 rises together with the elevating member 30. As described above, the screw shaft 28, the cap 29, and the electric tool 34 serve as elevating means for elevating the elevating member 30 below the fixed member 20. In addition, it may replace with the electric tool 34 and may raise / lower the raising / lowering member 30 using another actuator.

  When the elevating member 30 is moved up and down, the movement of the rail member 32 in the horizontal plane is restricted by the guide member 33, so that the elevating member 30 can be prevented from wobbling. As shown in FIG. 3, the elevating member 30 can be raised to a height position H <b> 1 where the upper surface abuts on the guide member 33 provided on the lower side of the plate-like portion 20 a.

  In FIG. 2, a universal joint 38 is provided on the surface 30 b side of the elevating member 30. The universal joint 38 includes a pair of yokes 39a and 39b, and the yokes 39a and 39b are connected by a cross shaft 40 having two orthogonal axes. The yoke 39a is joined to the elevating member 30, and the yoke 39b is joined to a long screw shaft 41 in which a screw groove (male screw) is spirally formed on the outer peripheral surface. Note that the universal joint 38 may adopt not only a cross shaft type but also various types.

  The core drill apparatus 1 in the present embodiment is configured as described above. Next, with reference to FIGS. 3-8, the positioning method and drilling operation | work of the height direction of the core drill unit 5 with respect to the workpiece 2 are demonstrated. In positioning of the core drill unit 5, the positioning machine 6 to be used differs depending on the height position of the drilled part. That is, as shown in FIG. 3, when the location where the workpiece 2 is drilled is above the horizontal reference line L1, the screw shaft 28 and the lifting member 30 are not necessary. The reference line L1 is determined on the basis of a place where the base 3 can be drilled in a state where the base 3 is fixed to the fixed member 20. The core bit 16 shown in FIG. 3 represents the height position when the screw shaft 9 is inserted into the lowermost opening 21 (1) and the base 3 is fixed.

  When drilling a location above the reference line L 1, the operator releases the screw shaft 28 from the nut member 27 and removes the screw shaft 28 and the lifting member 30 from the fixed member 20. Next, as shown in FIG. 4 (a), the operator holds the workpiece 20 while holding the workpiece 2 between the front (left side of the paper) and the rear (right side of the paper) with the clamp members 26A and 26B. 2 is placed on the upper surface.

  Next, as shown in FIG. 4B, the operator slides the slide member 24 toward the work piece 2 by a predetermined amount, and further operates the clamp members 26A and 26B to hold the work piece 2 from the front and back. Clamp it with (clamp). The location where the clamp members 26A and 26B contact the work 2 is a predetermined location that avoids the drilling location. Thereby, the to-be-fixed member 20 is fixed with respect to the workpiece 2 via clamp member 26A, 26B.

  Next, as shown in FIG. 5A, the operator brings the back surface of the base 3 into contact with the front surface 20a1 of the plate-like portion 20a at a desired height position with the rack 11 facing downward. From this state, the operator inserts the screw shaft 9 into the opening 7 of the base 3 and the desired opening 21 corresponding to the height position for drilling. Next, the operator fastens the base member 3 to the fixed member 20 by screwing the nut member 43 onto the screw shaft 9 from the surface side of the base 3 through the washer 42 and tightening. In addition, since the to-be-fixed member 20 is being fixed to the workpiece 2 by the clamp members 26A and 26B, even if the base 3 provided with the support | pillar 4 is fixed, it does not fall down. As described above, the screw shaft 9, the washer 42, and the nut member 43 are fixing means (second fixing) for fastening and fixing the base 3 to the fixed member 20 through any one of the plurality of openings 21. Means).

  Next, as shown in FIGS. 5B, 6, and 7, the operator inserts the column 4 into the opening 12 a of the core drill body 12. Then, the operator operates the handle 15 to move the core drill unit 5 to the workpiece 2 side (arrow a1 shown in FIGS. 5B and 6), and the tip of the core bit 16 (the end portion 16a side) is to be cut. The workpiece 2 is brought into contact. With the operation described above, the positioning of the core drill unit 5 in the height direction is completed.

  Next, the operator drives the drive motor 17 by a switch operation. Next, as shown in FIG. 8A, the operator advances the core drill unit 5 to the work 2 side while rotating the core bit 16 by the drive motor 17 (arrow a1). As a result, the core 2a which is an individual piece of the work 2 is cut out from the work 2 and the drilling of the work 2 is completed. The core 2 a immediately after being cut out is held inside the core bit 16. Thereafter, the operator rotates the handle 15 to pull the core drill unit 5 away from the work 2 and remove it from the column 4. Then, the operator removes the positioning device 6 from the work 2. 8B, the worker removes the core 2a from the core bit 16 by inclining the end 16a side of the core bit 16 with respect to the horizontal plane.

  As described above, the core drill device 1 according to the present embodiment includes the base 3, the support column 4 provided on the base 3, and the work piece 2 supported by the support column 4 along the longitudinal direction of the support column 4. The core drill unit 5 is movable in the direction in which the core drill unit 5 moves toward or away from the workpiece, and positioning means (positioning device 6) for determining the height position of the core drill unit 5 with respect to the work piece 2. The positioning means fixes the fixing member 20 (first fixing member) 20 to which the base 3 is fixed at a position above the workpiece 2 and the fixing member 20 to the workpiece 2. A fixing means is included.

  As described above, according to the core drill apparatus 1 in the present embodiment, the height of the work 2 that is impossible with the structure in which the anchor 3 is inserted into the work 2 through the base 3 and the base 3 is fixed. A location corresponding to a position, for example, a height position close to the upper surface of the workpiece 2 can be drilled. In addition, when a work 2 having a small thickness width (a length dimension in the Y-axis direction) or a work 2 having a continuous opening for the purpose of weight reduction is to be drilled, fixing with an anchor bolt However, the strength tends to be insufficient. However, if the fixed member 20 is fixed to the work piece 2 through the clamp of the work piece 2 by the clamp members 26A and 26B as in the core drill apparatus 1 in the present embodiment, the above-described one having a small thickness width is obtained. It is possible to easily perform the drilling work on the workpieces 2 of various sizes including the above.

  Further, in the fixing of the base 3 with the anchor bolt which is a conventional technique, it is necessary to form a hole in the work 2 for inserting the anchor bolt. This hole is not necessary in order to demonstrate the function of the work piece 2, and the aesthetic appearance of the work piece 2 is also impaired. Therefore, many workers and work requesters do not like the formation of holes. However, if the fixed member 20 is fixed to the work 2 using the clamp members 26A and 26B, it is not necessary to form a hole in the work 2, so that the work 2 can be prevented from being damaged. .

  The fixed member 20 is formed with a plurality of openings 21 having different height positions above the workpiece 2, and the positioning means further includes the fixing means (screw shaft 9, washer 42, nut member 43) described above. Contains. Therefore, the height position of the perforated part can be adjusted by appropriately changing the opening 21 to be inserted into the screw shaft 9.

  Next, with reference to FIG. 9 to FIG. 13, the positioning method in the height direction of the core drill unit 5 with respect to the workpiece 2 and the drilling operation when drilling a portion below the reference line L <b> 1 (FIG. 3) will be described. . First, as described above, the operator places the workpiece 20 on the upper surface of the workpiece 2 and further clamps the workpiece 2 by the clamp members 26A and 26B (FIGS. 4A and 4B). . Thereby, the fixing member 20 is fixed to the work 2.

  Next, as shown in FIG. 9, the operator manually screwed the screw shaft 28 supporting the elevating member 30 lightly into the nut member 27 by a predetermined amount and then uses the electric tool 34 to move the screw shaft 28 at a high speed. Rotate in a predetermined direction (arrow c). Thereby, the raising / lowering member 30 raises / lowers to arbitrary height positions (arrow d), and the raising / lowering member 30 is positioned in the height position according to the drilling location.

  Next, as shown in FIG. 10, the operator brings the back surface of the base 3 into contact with the surface 30 b of the elevating member 30 at a desired height position while inserting the screw shaft 41 into the opening 7 of the base 3. From this state, the operator fixes the base 3 to the elevating member 30 by screwing the nut member 45 to the screw shaft 41 through the washer 44 from the surface side of the base 3 and tightening. That is, the elevating member 30 also functions as a fixed member (second fixed member) to which the base 3 is fixed. Further, the screw shaft 41, the washer and the nut member 45 are fixing means (third fixing means) for fastening and fixing the base 3 to the elevating member 30.

  When the base 3 is fixed to the elevating member 30, the bolt member 46 shown in FIG. 12 is screwed into the opening 8 of the base 3, and the tip of the bolt member 46 is pressed against the surface 30 b of the elevating member 30. May be. Thereby, the wobbling of the base 3 with respect to the elevating member 30 can be prevented. Since the universal joint 38 is accommodated in the opening 7 of the base 3, the universal joint 38 and the base 3 do not interfere with each other.

  Next, as shown in FIGS. 11 and 12, the operator inserts the column 4 into the opening 12 a of the core drill body 12. Then, the operator operates the handle 15 to move the core drill unit 5 toward the workpiece 2 (arrow a1 shown in FIGS. 11 and 12), and brings the tip of the core bit 16 into contact with the workpiece 2.

  Next, as shown in FIG. 13, the operator further advances the core drill unit 5 with respect to the work 2 while rotating the core bit 16 (arrow a <b> 1). Thereby, the core 2a is cut out from the work 2 and the drilling of the work 2 is completed.

  As described above, the positioning means (positioning device 6) includes the elevating member 30 to which the base 3 is fixed and can be moved up and down relative to the fixed member 20, and the elevating and lowering that moves the elevating member 30 below the fixed member 20. Further comprising means. Thereby, the width of the up-down direction of the height position which can be drilled can be further expanded.

  Next, with reference to FIG. 14 and FIG. 15, an angle determination method and a drilling operation for determining the angle of the support column 4 with respect to the surface 2 b (drilling surface) of the work 2 will be described. For convenience, illustration of the fixed member 20, the clamp members 26A and 26B, the screw shaft 28, etc. is omitted in FIGS.

  First, the operator causes the screw shaft 28 supporting the lifting member 30 to be screwed onto the nut member 27, and then uses the electric tool 34 to rotate the screw shaft 28 in a predetermined direction at a high speed to move the lifting member 30 up and down. Then, the operator operates the electric tool 34 so that the elevating member 30 stops at a height position corresponding to the drilled portion. Thereby, the elevating member 30 is positioned at a desired height position. That is, the fixed member 20 provided with the nut member 27, the clamp members 26A and 26B, the screw shaft 28, and the electric tool 34 raise and lower the elevating member 30 with respect to the work piece 2 to a predetermined height position (drilling). Positioning means for positioning at a height position corresponding to the location). Thereby, the width in the vertical direction of the height position where drilling can be performed can be widened, and the operator can easily determine the height position of the elevating member 30.

  Next, as shown in FIG. 14A, the worker tilts the screw shaft 41 with respect to the surface 2 b of the work 2 by a desired angle (α °) with the universal joint 38 as a starting point. Next, as shown in FIG. 14B, the operator inserts the screw shaft 41 into the opening 7 of the base 3 while maintaining the inclination of the screw shaft 28. Then, the operator fastens the nut member 45 to the screw shaft 41 through the washer 44 from the surface side of the base 3. Further, the operator screws the bolt member 46 into the opening 8 of the base 3 and presses the tip of the bolt member 46 against the surface 30 b of the elevating member 30. Thereby, the support | pillar 4 provided in the base 3 is fixed to the raising / lowering member 30 in the state which maintained the inclination only for the predetermined angle ((alpha)) via the screw shaft 41. FIG. By the above operation, the angle of the support column 4 with respect to the surface 30b of the elevating member 30 is fixed.

  Next, as shown in FIG. 14 (c), the operator supports the core drill unit 5 on the support column 4, and advances the core drill unit 5 until a part of the tip of the core bit 16 contacts the work piece 2 (arrow a1). . Next, as shown in FIG. 15, the operator further advances the core drill unit 5 with respect to the work 2 while rotating the core bit 16. Thereby, the core 2a is cut out in an oblique direction with respect to the surface 2b of the workpiece 2 in plan view.

  As described above, the elevating member 30 as a fixed member to which the base 3 is fixed, the universal joint 38 provided on the elevating member 30, the screw shaft 41 connected to the universal joint 38, the washer 44 and the nut member described above. The fixing means including 45 and the bolt member 46 functions not only as a function of determining the height position of the core drill unit 5 described above but also as an angle determination means (angle determination tool) for determining the angle of the support column 4 with respect to the work piece 2. To do. In the operation of determining the angle of the support column 4, the screw shaft 28 inclined at a predetermined angle with respect to the lifting member (fixed member) 30 by the universal joint 38 is inserted into the opening 8 of the base 3. The base 3 is fastened and fixed to the elevating member 30 by the fixing means. Thereby, it can drill easily with respect to the workpiece 2 from various angles.

  The present invention is not limited to the embodiments described so far, and can be modified as appropriate without departing from the spirit of the invention. For example, the clamp members 26 </ b> A and 26 </ b> B are an example of sandwiching the workpiece 2, and any structure that can fix the workpiece 20 to the workpiece 2 by clamping may be used. Further, if it is not necessary to further widen the height position at which drilling is possible, the screw shaft 28, the elevating member 30, the guide member 33, and the electric tool 34 may be omitted. Further, the positioning device 6 may be used as an optional part for determining the height position of the core drill unit 5 independently from the core drill device 1.

  ADVANTAGE OF THE INVENTION According to this invention, the freedom degree of the height position drilled with respect to a workpiece can be raised, and it is especially useful in the field | area of construction work and civil engineering work.

DESCRIPTION OF SYMBOLS 1 Core drill apparatus 2 Workpiece 3 Base 4 Support | pillar 5 Core drill unit 6 Positioning tool 9 Screw shaft 20 Fixed member 21 Opening part 26A, 26B Clamp member 28 Screw shaft 29 Cap 30 Lifting member 34 Electric tool

Claims (2)

A core drilling device for drilling a workpiece,
Base and
A support provided on the base;
A core drill unit supported by the column and movable along the longitudinal direction of the column;
Positioning means for determining a height position of the core drill unit with respect to the workpiece,
The positioning means includes
A fixing member to which the base is fixed above the workpiece, and fixing means for fixing the fixing member to the workpiece;
The fixing means has a plurality of clamping means for sandwiching the workpiece from the front and the rear, and the fixing member is fixed to the workpiece via the plurality of clamping means ,
The positioning means further includes an elevating member fixed to the base and freely elevating with respect to the fixed member, and an elevating means for elevating the elevating member below the fixed member. . A height of the core drill unit with respect to a workpiece in a core drill apparatus comprising a base, a support provided on the base, and a core drill unit supported by the support and movable along a longitudinal direction of the support. A positioning tool in a core drill device for determining a position,
A fixed member to which the base is fixed above the workpiece, and fixing means for fixing the fixed member to the workpiece;
The fixing means has a plurality of clamping means for sandwiching the workpiece from the front and the rear, and the fixing member is fixed to the workpiece via the plurality of clamping means ,
A positioning device for a core drill apparatus , further comprising: an elevating member fixed to the base and freely elevating with respect to the fixed member; and elevating means for elevating the elevating member below the fixed member .

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