Core drill device

Abstract

To provide a core drill device that can be installed in a small space.SOLUTION: A core drill device 10 includes: a cylindrical core bit 11 having a cutter at its tip; a drive part 21 arranged at an end side of the core bit 11 and rotating the core bit 11; a support block supporting the drive part 21; a guide column part extending parallel to the core bit 11; a guided part provided on the support block and guided along the guide column part; and an arc-shaped base member 41 that is placed on a cutting object and extends in a peripheral direction along an outer peripheral surface of the core bit 11 and supports the end part of the guide columns 32 and 34.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a core drill device for drilling holes in structures such as concrete. [Background technology]

[0002] 2. Description of the Related Art A core drill device that drills holes in a concrete structure by pressing a cylindrical core bit rotating at high speed against the concrete structure is disclosed in, for example, Japanese Patent Application Laid-Open No. 11-320548 (Patent Document 1).

[0003] The cylindrical core bit is connected to a motor at its end. The motor is movable along a guide rail. The guide rail extends parallel to the core bit, and the base of the guide rail is supported by a base member. The base member is rectangular, and is fixed to the concrete structure by bolts. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 11-320548 Summary of the Invention [Problem to be solved by the invention]

[0005] However, the above-mentioned conventional core drill device has the following problems: When drilling a concrete slab in a place where many pipes extend vertically, such as the pipe space of an apartment building, the installation space is significantly restricted, and it is not possible to secure space for installing a base member.

[0006] In old apartment buildings, there is a need for renovation work to replace piping in the pipe space. Specifically, there is a need for a core drill device that can drill holes in the floor slab of the pipe space without interfering with other piping.

[0007] In view of the above-mentioned circumstances, an object of the present invention is to provide a core drill device that can be installed even in locations with many obstacles. [Means for solving the problem]

[0008] For this purpose, the core drill device of the present invention comprises a cylindrical core bit having a cutter at its tip, a drive unit arranged at the end of the core bit and rotating the core bit, a support block supporting the drive unit, a guide column extending parallel to the core bit, a guided portion provided on the support block and guided along the guide column, an arc-shaped base member placed on the object to be cut by the core bit, extending circumferentially along the outer peripheral surface of the core bit and supporting the ends of the guide column, and / or a plurality of second column portions placed on the object to be cut by the core bit, arranged at intervals circumferentially along the outer peripheral surface of the core bit and supporting the ends of the guide column.

[0009] According to the present invention, since the base member is disposed along the outer periphery of the core bit, the base member does not protrude significantly from the core bit when viewed in the extension direction of the core bit. The core drill device of the present invention has a small dimension in plan view, and can be easily installed in places with limited space, such as the pipe space of an apartment building where multiple pipes are lined up.

[0010] The number of guide pillars may be one or more, but preferably two. In the case of two, the base member is preferably a semicircular arc extending approximately 180°, with guide pillars erected at both ends. In one aspect of the present invention, the core drill device does not include a plurality of second pillars, but includes a base member, which is placed on the cutting object of the core bit and supports the ends of the guide pillars. In another aspect of the present invention, the core drill device does not include a base member, but instead includes ends of a plurality of second pillars that are placed on the cutting object of the core bit. There may be two or more second pillars, but preferably three, and more preferably four.

[0011] In one aspect of the present invention, the core drill device includes both a base member and a second column portion, the second column portion is detachably extended from the end of the guide column portion, and the base member is coupled to the end of the second column portion. According to this aspect, the guide column portion is connected in series to the second column portion, so that the length of the second column portion can be changed according to the cutting object to be cut by the core bit. In addition, the base member and the second column portion can be separated from the guide column portion, which facilitates the work of fixing the base member to the cutting object.

[0012] In a preferred aspect of the present invention, the core drill device includes an arc-shaped member that is connected to an end of the guide column, and a plurality of second columnar parts are arranged at intervals in the circumferential direction of the core bit, one end of each of the second columnar parts is detachably connected to the arc-shaped member, and the other end of each of the second columnar parts is connected to the base member. According to this aspect, the arc-shaped member can be placed on the workpiece as a base member without using the second columnar parts. In another aspect, the core drill device of the present invention may not include an arc-shaped member, and the second columnar part may be connected and fixed to the end of the guide column.

[0013] The support block may be provided with an operating element, and the support block may be moved forward and backward along the guide column by an operator operating the operating element. The structure of the operating element may be a lever or a handle wheel, and is not particularly limited. As one aspect of the present invention, the core drill device includes a rotating shaft that extends in the guiding direction of the guide column, one end of which is connected to the guided part and the other end of which is disposed on the side farther from the base member, and a handle wheel that is coaxially provided on the other end of the rotating shaft, and the guided part is configured to move forward and backward in the guiding direction of the guide column in response to a rotation operation input to the handle wheel. According to this aspect, the rotating shaft of the handle extends in the extending direction of the guide column, and the dimensions of the core drill device are small in the extending direction. Therefore, when the core drill device is installed in a place where there is little space, such as a pipe space in an apartment building where multiple pipes are lined up, the handle wheel is less likely to interfere with the pipes.

[0014] The method of fixing the base member to the cutting object is not particularly limited. In one aspect of the present invention, a through hole is formed in the base member, a hole for an anchor is drilled in the cutting object, and the base member is fixed to the cutting object by passing an anchor bolt through the through hole and fixing it to the anchor hole. Alternatively, as one aspect of the present invention, the core drill device includes a clamp member having a through hole and a clamp portion, anchored to the cutting object through the through hole, and engaged with the base member at the clamp portion to hold the base member immovable. According to this aspect, even if the base member cannot be anchored due to circumstances such as a forest of pipes, the base member can be fixed to the cutting object via the clamp member. Effect of the Invention

[0015] In this way, according to the present invention, even in a place where the space is narrow and there are many restrictions, the core drill device can be installed and the place can be drilled with a core bit. Therefore, it is useful for the renovation work of old reinforced concrete houses. [Brief description of the drawings]

[0016] [Figure 1] FIG. 2 is a rear view showing the core drill device according to one embodiment of the present invention. [Diagram 2] FIG. [Diagram 3] FIG. [Figure 4] FIG. [Diagram 5] FIG. 1 is a side view showing dimensions of a conventional core drill device. [Figure 6] FIG. 11 is a side view showing dimensions of a core drill device according to another embodiment of the present invention. [Figure 7] FIG. 11 is a rear view showing a core drill device according to another embodiment of the present invention. [Figure 8] FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. Fig. 1 is a rear view showing a core drill device according to an embodiment of the present invention. Fig. 2 is a bottom view showing the same embodiment. Fig. 3 is a plan view showing the same embodiment. Fig. 4 is a side view showing the same embodiment.

[0018] The core drill device 10 of this embodiment includes a core bit 11, a driving unit 21, a support block 31, guide column portions 32, 34, guided portions 33, 35, and a base member 41. The core bit 11 is cylindrical in shape and has an upper end 12 and a lower tip 13. A cutter 15 such as a diamond cutter is provided at the tip 13. The end 12 is closed with a disk. A connection joint 14 is provided at the center of the end 12. The connection joint 14 detachably connects and fixes an output shaft 22 protruding downward from the support block 31 to the end 12 of the core bit 11. The driving unit 21 is an electric motor.

[0019] The support block 31 has a symmetrical shape, and the drive unit 21 is fixed to the upper side of the center in the left-right direction. The output rotation of the drive unit 21 is transmitted to the output shaft 22 via a parallel shaft gear mechanism (not shown) or another gear mechanism provided in the support block 31. Guided portions 33, 35 are provided at the left and right ends of the support block 31, respectively.

[0020] A pair of guide pillars 32, 34 are disposed on both the left and right sides of the support block 31 corresponding to the guided parts 33, 35. The guide pillars 32, 34 are pillars that extend straight in the vertical direction and are parallel to each other. One guided part 33 is guided along the guide pillar 32. The other guided part 35 is guided along the guide pillar 34. An example of a combination of the guide pillars 32, 34 and the guided parts 33, 35 is a rack provided on the guide pillars 32, 34 and a pinion provided on the guided parts 33, 35.

[0021] The upper ends of the guide pillars 32, 34 are fixed to a left-right direction member 38. The lower ends of the guide pillars 32, 34 are fixed to an arc-shaped member 36. The arc-shaped member 36 is a flat plate material in a semicircular shape that extends in an arc along the outer circumferential surface of the core bit 11. See FIG. 3 for the semicircular shape. With the arc-shaped member 36 and the drive unit 21 on the rear side, the semicircular shape is open toward the front. The left-right direction member 38 and handle operator 47 are arranged in front of the drive unit 21.

[0022] 1, two guide pillars 32, 34 are erected on the upper surface of the arc-shaped member 36. As a specific example, the left end of the arc-shaped member 36 is connected to the lower end of one guide pillar 32, and the right end of the arc-shaped member 36 is connected to the lower end of the other guide pillar 34.

[0023] The core drill device 10 further includes a plurality of second pillar portions 37, 37.... In this embodiment, four second pillar portions 37 are provided. The multiple second pillar portions 37 extend parallel to one another in the vertical direction. The multiple second pillar portions 37 are also arranged at intervals in the circumferential direction of the core bit 11 so as to follow the outer circumferential surface of the core bit 11. The upper end of each second pillar portion 37 is attached and fixed to the lower surface of the arc-shaped member 36 so as to be accessible by hand. The lower end of each second pillar portion 37 is connected to the base member 41.

[0024] The base member 41 extends in an arc shape as shown in Fig. 2. The base member 41 is a semicircular flat plate material similar to the above-mentioned arc-shaped member 36, and preferably has the same dimensions. The base member 41 is placed on the object 100 to be cut. The object 100 to be cut is, for example, a floor slab of a concrete structure.

[0025] A plurality of female screw holes 42, 42... are formed in the base member 41. Bolts 43 are screwed into the female screw holes 42, 42... from above. The heads of the bolts 43 protrude from the upper surface of the base member 41, and the tips of the shafts of the bolts 43 protrude from the lower surface of the base member 41 and come into contact with the concrete slab of the object to be cut 100. The heads of the bolts 43 are rotated as appropriate to adjust the amount by which the tips of the shafts of the bolts 43 protrude, so that the base member 41 is placed horizontally on the object to be cut 100.

[0026] It should be noted here that the core drill device 10 may be provided with two arc-shaped members 36, which are connected and fixed in the thickness direction by bolts 36b so as to be overlapped with each other in the vertical direction. Alternatively, the bolts 36b may be loosened to separate the arc-shaped members 36. The upper arc-shaped member 36 is connected to the guide pillar portions 32, 34. The lower arc-shaped member 36 is connected to a second pillar portion 37. The lower arc-shaped member 36, the plurality of second pillar portions 37, and the base member 41 constitute a foundation portion 40.

[0027] 4, a rotating shaft 46 is erected on the support block 31. The rotating shaft 46 is arranged parallel to the output shaft 22 of the drive unit 21, and extends in the vertical direction while being passed through a sleeve 39 provided in the left-right center of the left-right direction member 38. The lower end of the rotating shaft 46 is mechanically connected to the guided parts 33, 35 within the support block 31. This connection may be made by using a rotation transmission mechanism, such as a combination of a bevel gear and a drive shaft.

[0028] The lower end of the rotating shaft 46 is relatively close to the base member 41, while the upper end of the rotating shaft 46 is relatively far from the base member 41, and a handle operator 47 is provided at the upper end. The handle operator 47 is, for example, an operating wheel 47b arranged coaxially with the rotating shaft 46, and a rod-shaped handle 47c erected at one location in the circumferential direction of the operating wheel 47b. As shown in Fig. 3, the rotating shaft 46 and the handle operator 47 overlap with the left-right direction member 38 when viewed in the extending direction of the guide pillars 32, 34.

[0029] The rotation of the handle operator 47 is transmitted via the rotating shaft 46 to pinions (not shown) provided on the guided portions 33, 35. As a result, when a user of the core drill device 10 rotates the handle operator 47 in one direction, each pinion rotates in one direction and rolls on the racks of the guide pillar portions 32, 34, and the support block 31 moves closer to the arc-shaped member 36, that is, descends. When the user rotates the handle operator 47 in the other direction, each pinion rotates in the other direction and the support block 31 moves away from the arc-shaped member 36, that is, rises. The drive unit 21 and the core bit 11 move up and down together with the support block 31.

[0030] While the driving unit 21 rotates the core bit 11 at high speed, the cutter 15 provided at the tip 13 of the core bit 11 is pressed against the object 100 to drill a hole in the object 100. This forms a hole in the object 100 with an inner diameter dimension that is the same as the outer diameter of the core bit 11. By using a core bit 11 with an axial dimension longer than the object 100, the core bit 11 penetrates the object 100.

[0031] 1, the core drill device 10 is fixed to a concrete slab of the workpiece 100 by clamp members 44. The clamp members 44 are plate members, and at least two clamp members 44 are arranged on the left and right outside of the base member 41, and preferably one is also arranged in the center in the left-right direction, although not shown. The clamp members 44 are formed with a through hole 44h and a female screw hole 44t.

[0032] An anchor bolt 45 is inserted through the through hole 44h and is embedded and fixed in the concrete slab of the cutting object 100, protruding upward from the concrete slab. A nut 49 is screwed onto the upper end of the anchor bolt 45. The nut 49 is tightened and abuts against the upper surface of the clamp member 44, thereby fixing the clamp member 44 to the concrete slab of the cutting object 100. The clamp member 44 is basically of a constant thickness, and the upper and lower surfaces are flat, but the upper surface of the edge portion 44b that engages with the base member 41 is made to be an inclined surface that gradually descends toward the base member 41. In other words, the thickness of the edge portion 44b is formed thinner than the other portions. The edge portion 44b abuts against the base member 41 from above, and presses and fixes the base member 41 against the cutting object 100.

[0033] A bolt 48 is screwed into the female screw hole 44t of the clamp member 44. The head of the bolt 48 protrudes from the upper surface of the clamp member 44, and the tip of the shaft of the bolt 48 protrudes from the lower surface of the clamp member 44 to abut against the concrete slab of the cutting object 100. The clamp member 44 is placed in a horizontal position by appropriately rotating the head of the bolt 48 to adjust the amount of protrusion of the tip of the shaft of the bolt 48. Note that this embodiment shows one example of the clamp member 44, and the shape, arrangement, and structure of the clamp member 44 are not limited to this.

[0034] As described above, the core drill device 10 comprises a cylindrical core bit 11 having a cutter 15 at its tip 13, a drive unit 21 arranged on the end 12 side of the core bit 11 and rotating the core bit 11, a support block 31 supporting the drive unit 21, guide pillar portions 32, 34 extending parallel to the core bit 11, guided portions 33, 35 provided on the support block 31 and guided along the guide pillar portions 32, 34, and an arc-shaped base member 41 placed on the object 100 to be cut by the core bit 11, extending circumferentially of the core bit 11 so as to follow the outer peripheral surface of the core bit 11, and supporting the ends of the guide pillar portions 32, 34.

[0035] As shown in Fig. 2, the core drill device 10 of this embodiment is provided with an arc-shaped base member 41, so that the front-rear dimension Lh is smaller than that of the conventional core drill device 10, and the core drill device 10 can be installed even in places where the installation space is highly restricted, such as the pipe space of an apartment building. Note that, referring to Fig. 2, the left-right dimension Lg of this embodiment includes the two guide pillars 32, 34, so although it is slightly larger than the front-rear dimension Lh, this does not prevent the device from being installed in places where the installation space is highly restricted.

[0036] For reference, a conventional core drill device 200 shown in FIG. 5 will be described. The core drill device 200 includes a core bit 201, a driving unit 202, a support block 203, a guide column 204, and a base member 205. The base member 205 is placed on the cutting object 100 and fixed to the cutting object 100 with a bolt 206. The guide column 204 is erected on the front edge of the base member 205. The support block 203 is attached to the guide column 204 extending vertically, and moves up and down along the guide column 204. The core bit 201 and the driving unit 202 are disposed on the front side as viewed from the guide column 204. In contrast, the base member 205 protrudes rearward as viewed from the guide column 204 so as not to interfere with the core bit 201.

[0037] The longitudinal dimension Lj of the conventional core drill device 200 includes the distance from the base member 205 to the core bit 201. Therefore, it is longer than the longitudinal dimension Lh of the core drill device 10 of the present embodiment (Lj>Lh). Therefore, it requires a relatively large installation space. The conventional core drill device 200 cannot be installed in a narrow space, such as a pipe space in an apartment building, where multiple pipes extending in the vertical direction are lined up.

[0038] The core drill device 10 of this embodiment includes a second pillar portion 37 that is detachably extended from the end of the guide pillar portions 32, 34, and the base member 41 is coupled to the end of the second pillar portion 37. This allows the second pillar portion 37 to be detached and replaced, facilitating the work of placing and fixing the base member 41 on the workpiece 100 to be cut. In addition, the second pillar portion 37 can be appropriately changed depending on the thickness of the workpiece 100 to be cut and the cutting length.

[0039] The core drill device 10 of this embodiment also includes an arc-shaped member 36 that is connected to the ends of the guide pillars 32, 34, and a plurality of second pillars 37 are arranged at intervals in the circumferential direction of the core bit 11, one end of each of the second pillars 37 is detachably connected to the arc-shaped member 36, and the other end of each of the second pillars is connected to the base member 41. This increases the rigidity of the foundation portion 40 consisting of the second pillars 37 and the base member 41.

[0040] The core drill device 10 of this embodiment also includes a rotating shaft 46 that extends in the guiding direction of the guide column parts 32, 34, one end of which is connected to the guided part and the other end of which is disposed on the side farther from the base member 41, and a handle operator 47 provided on the other end of the rotating shaft 46, and the guided parts 33, 35 are configured to move forward and backward in the guiding direction in response to an operation input to the handle operator 47. As a result, as shown in the plan view of Figure 3, the rotating shaft 46 and the handle operator 47 overlap with the support block 31 and / or the drive unit 21 when viewed in the extending direction of the guide column parts 32, 34. As a result, when the support block 31 and the drive unit 21 move forward and backward along the guide column parts 32, 34, the rotating shaft 46 and the handle operator 47 are less likely to interfere with surrounding structures.

[0041] In addition, when the core bit 11, drive unit 21 and support block move back and forth guided by the guide column portions 32, 34, the rotating shaft 46 and handle operator 47 also move back and forth together, without interfering with the surrounding components.

[0042] The core drill device 10 of this embodiment also includes a clamp member 44 as a steel plate member having a through hole 44h. The clamp member 44 is anchored to the cutting object 100 by passing a bolt 45 through the through hole 44h, and an edge portion 44b (clamp portion) of the clamp member 44 engages with the base member 41. Thus, the clamp member 44 holds the base member 41 so that it cannot be displaced. According to this embodiment, even if the bolt 43 cannot be passed through the through hole 42 of the base member 41 to anchor it due to circumstances such as installing the core drill device 10 in a pipe space where many pipes extending in the vertical direction are lined up, the base member 41 can be fixed to the cutting object 100 by the clamp member 44 and the bolt 45.

[0043] Next, a core drill device according to another embodiment of the present invention will be described. Fig. 6 is a side view showing the other embodiment. In the other embodiment, the same reference numerals are used to designate the same components as those in the above-mentioned embodiment, and the description thereof will be omitted. The different components will be described below. In the core drill device 20 according to the other embodiment, the guide column portion 32 extends in the vertical direction between the cutting object 100, which is the floor surface, and the concrete slab 300, which is the floor ceiling. The concrete slab 300 is the same as the cutting object 100, and forms the floor surface of the upper floor. The guide column portion 32 may be a telescopic column such as a nested type, or a column whose length can be adjusted by adding an extension.

[0044] An upper end member 51 provided at the upper end of the guide column portion 32 is fixed to the concrete slab 300. The lower end of the guide column portion 32 is fixed to the cutting target object 100 by a lower end member 52. In this manner, both ends of the guide column portion 32 are fixed by the upper end member 51 and the lower end member 52, and stably supports the driving part 21 and the support block 31. The shapes of the upper end member 51 and the lower end member 52 are not particularly limited, but may be, for example, arc-shaped members centered on the axis X of the driving part 21 extending along the rotation shaft 22.

[0045] According to the embodiment shown in FIG. 6, the lower end member 52 is disposed at a position close to the core bit 11. Therefore, the core drill device 20 has a more compact layout than the base member 205 of the conventional example shown in FIG. 5, and the front-rear dimension Lh can be reduced (Lh < Lj). The core drill device 20 can be installed at a location where a large number of vertically extending pipes are densely arranged, such as in the pipe space of an apartment house.

[0046] Next, a core drill device according to another embodiment of the present invention will be described. FIG. 7 is a perspective view showing another embodiment. FIG. 8 is a rear view showing another embodiment. For another embodiment, the same reference numerals are given to the configurations common to the above-described embodiment, and the description thereof will be omitted, and the different configurations will be described below. The core drill device 30 according to another embodiment has a base portion 50 instead of the base portion 40 described above. The base portion 50 includes the arc-shaped member 36, a plurality of second column portions 37, and a plurality of lower end members 56 described above. The plurality of second column portions 37 are arranged in an arc, and their upper ends are connected by the arc-shaped member 36. A lower end member 56 is provided at the lower end of each second column portion 37. The second column portions 37 may be arranged at circumferential intervals along the outer peripheral surface of the core bit 11, and the number thereof is not limited. In the embodiment shown in FIG. 8, three are arranged.

[0047] The lower end member 56 is a plate piece slightly larger than the cross section of the second column portion 37, but does not connect the plurality of second column portions 37 to each other. Similar to the clamp member 44 (FIG. 1) described above, the lower end member 56 preferably has a female screw hole and a through hole, and is fixed to an anchor bolt passing through the through hole while its posture is adjusted by a bolt screwed into the female screw hole.

[0048] According to the core drill device 20 according to another embodiment, similar to the above-described embodiment, the front-rear dimension Lh is smaller than before, and the core drill device 10 can be installed even in a location where there are large restrictions on the installation space, such as the pipe space of an apartment house.

[0049] Although the embodiment of the present invention has been described above with reference to the drawings, the present invention is not limited to the illustrated embodiment. Various modifications and variations can be made to the illustrated embodiment within the same scope as the present invention or within an equivalent scope. For example, a part of the configuration may be extracted from one embodiment described above, and another part of the configuration may be extracted from another embodiment described above, and these extracted configurations may be combined. [Industrial Applicability]

[0050] The present invention can be advantageously used in remodeling and repair work on concrete structures, such as cutting a concrete structure with a core bit to create a through hole, removing an existing old pipe, and installing a new pipe into the through hole. [Explanation of symbols]

[0051] 10 core drill device, 11 core bit, 21 drive unit, 31 support block; 32, 34 guide column portion; 33, 35 guided portion; 41 base member, 44 clamp member, 46 rotating shaft, 47 handle operator, 47b operating wheel, 52,56 lower end member.

Claims

1. A cylindrical core bit having a cutter at its tip; A drive unit arranged on an end side of the core bit and rotating the core bit; A support block for supporting the drive unit; A guide post portion extending parallel to the core bit; a guided portion provided on the support block and guided along the guide post portion; A core drill device comprising: an arc-shaped base member that is placed on the cutting object of the core bit, extends circumferentially along the outer peripheral surface of the core bit, and supports the ends of the guide column portion; and / or a plurality of second column portions that are placed on the cutting object of the core bit, arranged at intervals circumferentially along the outer peripheral surface of the core bit, and support the ends of the guide column portion.

2. The base member and the second pillar portion are both provided, The second pillar portion is detachably extended from the end portion of the guide pillar portion, The core drill apparatus of claim 1 , wherein the base member is coupled to an end of the second post.

3. An arc-shaped member is provided which is coupled to the end of the guide post, The second pillar portions are arranged at intervals in the circumferential direction of the core bit, One ends of the plurality of second columnar portions are detachably connected to the arc-shaped member, The core drill apparatus according to claim 2 , wherein the other ends of the plurality of second posts are coupled to the base member.

4. a rotating shaft extending in a guiding direction of the guide post portion, one end of which is connected to the guided portion and the other end of which is disposed on a side farther from the base member; a handle wheel coaxially provided on the other end of the rotating shaft, The core drill device according to claim 1 , wherein the guided portion is adapted to move forward and backward in the guiding direction in response to a rotational operation input to the handle wheel.

5. The core drill device according to claim 1 , further comprising a clamp member having a through hole and a clamp portion, the clamp member being anchored to the workpiece at the through hole and engaging with the base member at the clamp portion to hold the base member non-displaceable.

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