Core Drill Cover

Abstract

To provide a cover which can be attached to a core drill without changing the device configuration in drilling work using a core drill, and enables safe work on any construction surface. [Solution] This cover C comprises one cover plate 1R and the other cover plate 1L which surround the outer peripheral surface of the core drill body 13, and each of the one cover plate 1R and the other cover plate 1L has a fastener 2 on one side which connects and holds one side of each cover plate 1R, 1L to each other, and a magnet 3 on the other side which can be attracted to a support 12 by magnetic force, and is removably attached around the core drill body 13.

Description

[Technical field]

[0001] The present invention relates to a core drill cover that is useful for a core drill used to drill holes in concrete structures, asphalt, bricks, tiles, stone, rocks, etc. (hereinafter collectively referred to as "concrete structures, etc."). [Background technology]

[0002] Conventional core drills of this type and methods of drilling holes using the same are proposed in Patent Documents 1 and 2.

[0003] The core drills in Documents 1 and 2 are composed of a base, a support pillar standing upright from the base and with a rack arranged upright on one side, a drill head mounted on the support pillar so that it can be raised and lowered and having a pinion inside that meshes with the rack, a core bit removably attached to the output shaft of the drill head by a shank, a motor with a reducer that is provided on the drill head and rotates the core bit, and a handle that is slidably inserted into the shaft portion that is integral with the pinion shaft and is used to rotate the pinion.

[0004] When using such a core drill to drill a hole in a concrete structure, first, the base is fixed to the concrete structure with an anchor bolt, and the drill head is fixed to a support with a set screw. Next, the motor is driven to rotate the core bit while the handle is operated to press the core bit against the concrete structure. Then, the handle is pressed down to apply thrust to drill the hole.

[0005] In addition, the construction surfaces drilled with this type of core drill include many surfaces such as floors, walls, and ceilings in concrete structures. Moreover, floors and ceilings have not only horizontal surfaces but also inclined surfaces, and walls also have not only vertical surfaces but also inclined surfaces. Furthermore, there are also narrow surfaces at the joints of two surfaces, such as between ceilings and walls and between floors and walls. In this way, drilling work using a core drill is performed on various construction surfaces in concrete structures. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2005-199405 A [Patent Document 2] Japanese Patent Application Publication No. 8-224726 Summary of the Invention [Problem to be solved by the invention]

[0007] When drilling holes using a core drill like this, the core bit of the core drill is rotated by a motor while the handle is operated to press the core bit against the construction surface, and the handle is pressed down to apply thrust to drill holes on various construction surfaces such as concrete structures, so the following problems are of concern. (1) During drilling operations using a core drill, the work clothes or gloves of the worker operating the core drill may come into contact with the rotating core drill body and become entangled. (2) There are various materials and parts required for construction at the construction site, such as sheets and ropes. During the drilling work using a core drill, these materials and parts may be blown off by external forces such as strong winds and may hit and become entangled in the rotating core drill body.

[0008] The present invention is intended to solve such problems in the past, and aims to provide a core drill cover that can be attached to a general core drill without changing the device configuration for this type of core drill and for drilling work using it, and that allows workers to safely perform work similar to that performed with previous core drills in any construction surface. [Means for solving the problem]

[0009] In order to achieve the above object, the present invention provides: A core drill cover for a core drill comprising: a base that is removably installed and fixed on a concrete structure or the like; a support post that is vertically installed on the base and has a rack attached thereto; a slide block that has a pinion that meshes with the rack and is attached to the support post so that it can be raised and lowered; a handle that is provided on the slide block and that rotates the pinion or a feed motor that rotates the pinion; a rotation motor mounted on the slide block; and a core drill body that is operatively connected to the rotation motor and has a core bit that is arranged in parallel with the support post, and the core bit is rotated by the rotation motor to drill a hole in a concrete structure or the like by operating the handle or driving the feed motor, a cover plate that encloses the remaining portion of the outer circumferential surface of the core drill body and opens a portion thereof facing the support pillar; The cover plate is divided at a circumferential middle of the outer peripheral surface of the core drill body to include one cover plate and the other cover plate, each of the one cover plate and the other cover plate has a fastener on one side for connecting and holding one side of the one cover plate and one side of the other cover plate to each other, and has a magnet on the other side capable of being attracted to the support by magnetic force; The one cover plate and the other cover plate are arranged around the core drill body, connected by the fastener, fixed to the support by the magnet, and attached to the core drill. The gist of the present invention is as follows.

[0010] It is preferable that each part of the core drill cover is embodied as follows. (1) At least one surface of the cover plate has a plurality of through holes that allow the inside of the cover plate to be seen from the outside. (2) Each of the surfaces of the one cover plate and the other cover plate corresponding to both sides of the core drill body has a plurality of through holes so that the inside of each cover plate can be seen from the outside. (3) The cover plate is formed with a U-shaped cross section so that one surface facing the outer circumferential surface of the core drill body adjacent to the support pillar is open and the remaining portion can be enclosed. In this case, it is desirable that the cover plate is divided at the circumferential center of the outer circumferential surface of the core drill body, and that one cover plate and the other cover plate are formed symmetrically with respect to the position of division. (4) The mounting members of each cover plate extend from the other end of each of the one cover plate and the other cover plate, and a magnet is provided on the mounting members of each cover plate. Effect of the Invention

[0011] According to the core drill cover of the present invention, with the above-mentioned configuration, one cover plate and the other cover plate are arranged around the core drill body, connected with fasteners, fixed to the support by magnets, and attached to the core drill, and the core drill body is surrounded by this core drill cover, so that in the core drill and drilling work using it, it can be attached to a general core drill without changing the device configuration, and further, in any construction surface, workers can safely perform work similar to that performed with conventional core drills, which is a unique and exceptional effect of the present invention. [Brief description of the drawings]

[0012] [Figure 1] FIG. 1 is a perspective view showing the configuration of a core drill cover according to an embodiment of the present invention together with a general core drill; [Diagram 2] A diagram showing the configuration of the core drill cover ((a) is a front view, (b) is a rear view, (c) is a right side view, (d) is a left side view, (e) is a plan view, and (f) is a bottom view). [Diagram 3] A diagram showing the configuration of the core drill cover (cross-sectional view of line A-A in Figure 2) [Figure 4] A diagram showing an example of construction using a core drill with a cover for the core drill ((a) is a plan view, (b) is a side view, and (c) is a front view). DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] Next, the embodiment of the present invention will be described with reference to the drawings. The core drill cover according to the present invention can be used for general core drills. First, the outline of the general core drill will be described, and then the core drill cover will be described.

[0014] Figure 1 shows a core drill. As shown in Figure 1, the core drill D comprises a base 11, a support 12, and a core drill body 13, and the core drill body 13 is configured to have a slide block 14, a handle 15 or a feed motor (not shown), a rotation motor 16, and a core bit 17.

[0015] The base 11 is removably installed and fixed to a concrete structure or the like, and in this case is made of a substantially flat plate having a post mounting portion 110 in the center of one end and anchor insertion portions 111 at the four corners.

[0016] The support 12 is vertically disposed on the base 11, and a rack 121 is attached to it. In this case, the support 12 is made of a single support having a substantially rectangular cross section, and the rack 121 is provided in the longitudinal direction of the support 2 on one side surface corresponding to one end of the base 11, and is fixed to the support mounting portion 110 on one end of the base 11 by a bolt.

[0017] As described above, the core drill body 13 includes the slide block 14, the handle 15 or the feed motor, the rotation motor 16, and the core bit 17.

[0018] The slide block 14 has a pinion (not shown) that meshes with the rack 121, and is attached to the support 12 so as to be movable up and down. In this case, the slide block 14 has a block body 141 that is substantially square-shaped in plan view and is engageable with the periphery of the support 12, and a holder 142 that protrudes from one end of the block body 141 and supports the rotation motor 16. A pinion is disposed on the inner surface of the block body 141 that faces the surface having the rack 121 of the support 12 so as to be engageable with the rack 121 of the support 12.

[0019] The handle 15 is provided on the slide block 14 and serves to rotate the pinion, and in this case, is operatively connected to the rotation shaft of the pinion on the inner surface of the block body 141 and disposed on the side of the slide block 14. By manually rotating the handle 15, the pinion is rotated and rolled on the rack 121 of the support 12, and the slide block 14 can move up and down along the support 12.

[0020] Although not specifically shown, the feed motor is provided in the slide block 14 and drives the pinion 140 to rotate, and is operatively connected to the rotation shaft of the pinion on the inner surface of the block body 141 and disposed on the side of the slide block 14. In this case, the feed motor is a motor with a reducer, and the pinion is driven to rotate and roll on the rack 121 of the support 12, allowing the slide block 14 to move up and down along the support 12.

[0021] The rotation motor 16 rotates and drives the core bit 17, and is mounted on the slide block 14. In this case, the rotation motor 16 is a motor with a reducer, and is held on the holder 142 of the slide block 14 with the rotation shaft 161 facing downward, and the rotation shaft 161 is disposed below the holder 142 of the slide block 14.

[0022] The core bit 17 is operatively connected to the rotary motor 16, and is disposed in parallel to the support pillar 12. In this case, the core bit 17 is generally cylindrical with an open tip and a closed base end, a diamond tip is provided at the tip as a cutting section 171, and a connecting section 170 for connecting to the rotary shaft 161 is provided at the center of the base end. The connecting section 170 of this core bit 17 is concentrically connected to the rotary shaft 161 of the rotary motor 16, and is attached to the rotary motor 16.

[0023] In this manner, the core drill D is configured to rotate the core bit 17 by the rotary motor 16, and to drill holes in concrete structures or the like by rotating the handle 15 or by driving the feed motor.

[0024] 1, 2 and 3 show a core drill cover C. As shown in Fig. 1, the core drill cover C (hereinafter referred to as this cover C) is made of a cover plate 1 that surrounds the outer circumferential surface of the core drill body 13, leaving a portion thereof facing closely to the support 12 open and surrounding the remaining portion. In other words, this cover C is made of the cover plate 1 that can surround the outer circumferential surface of the core drill body 13. Since the core drill body 13 is attached to the support 12 and driven in the vertical direction, at least a portion of the cover plate 1 facing closely to the support 12 has an open surface 10.

[0025] The cover plate 1 is made of a metal material, and may have any shape, including a square or circular cross section, as long as it can surround the outer circumferential surface of the core drill body 13 as described above. In this case, the cover plate 1 is made of aluminum, and is formed with a U-shaped cross section such that one side facing the outer circumferential surface of the core drill body 13 close to the support 12 is open and the remaining part can be surrounded.

[0026] The cover plate 1 may be an integral plate, or may be a combination of a plurality of plates that can be separated. In this case, the cover plate 1 is divided at the circumferential center of the outer peripheral surface of the core drill body 13, and is configured with one cover plate 1R and the other cover plate 1L. The shapes (particularly the horizontal cross-sectional shapes) of the one cover plate 1R and the other cover plate 1L may be the same or different. In this case, the cover plate 1 is divided at the circumferential center of the outer peripheral surface of the core drill body 13, and the one cover plate 1R and the other cover plate 1L are formed symmetrically with the position of the division as the symmetric center, and have the same shape. Also, in this case, since the cover plate 1 is formed in a U-shaped cross section, the one cover plate 1R and the other cover plate 1L are each formed in an L-shaped cross section. 2, one cover plate 1R is made up of a front portion 101R covering the radial right half of the front surface of the core drill body 13 opposite the support pillar 12, and a right side portion 102R covering the right side surface of the core drill body 13. The other cover plate 1L is made up of a front portion 101L covering the radial left half of the front surface of the core drill body 13 opposite the support pillar 12, and a left side portion 102L covering the left side surface of the core drill body 13. In this case, the front portions 101R, 101L of one cover plate 1R and the other cover plate 1L each form a vertically elongated rectangle with a width slightly larger than the radius of the core drill body 13 and a height the same as or slightly smaller than the height of the core drill body 13, and the right side portion 102R of one cover plate 1R and the left side portion 102L of the other cover plate 1L each form a vertically elongated rectangle with a width slightly larger than the diameter of the core drill body 13 and a height the same as or slightly smaller than the height of the core drill body 13, similar to the front portions 101R, 101L.

[0027] At least one surface of the cover plate 1 has a plurality of through holes 104 so that the inside can be seen through from the outside of the cover plate 1. In this case, the surfaces of one cover plate 1R and the other cover plate 1L corresponding to both sides of the core drill body 13 have a plurality of through holes 104R, 104L so that the inside can be seen through from the outside of each cover plate 1R, 1L. In this case, as shown in FIG. 2, the right side surface portion 102R of one cover plate 1R has a plurality of through holes 104R aligned vertically and horizontally, and the left side surface portion 102L of the other cover plate 1L has a plurality of through holes 104L aligned vertically and horizontally. In this case, openings 103R, 103L are formed in a vertically long rectangular shape at a part of the upper half side, a predetermined position, and at a part of the lower half side, a predetermined position, on the right side surface 102R of one cover plate 1R and the left side surface 102L of the other cover plate 1L, respectively, and a punching metal 1040 is fixed and attached to the inner side of the right side surface 102R and the left side surface 102L in these openings 103R, 103L as shown in Fig. 3, thereby providing a large number of through holes 104 (104R, 104L) in the cover plate 1. Note that, on the right side surface 102R of one cover plate 1R and the left side surface 102L of the other cover plate 1L, each opening 103R, 103L is formed at a predetermined position where the state of the core drill body 13 on the inside and the state of the drilling of the construction surface by the core drill body 13 can be easily seen from the outside of each cover plate 1R, 1L. On the right side surface portion 102R of one cover plate 1R and on the left side surface portion 102L of the other cover plate 1L, the punched metal is formed with a large number of holes of a size that allows the condition of the core drill body 13 on the inside of each cover plate 1R, 1L and the condition of the holes drilled by the core drill body 13 on the construction surface to be easily seen from the outside.

[0028] The cover plate 1 has fasteners 2 (20, 21) on one side of one cover plate 1R and one side of the other cover plate 1L connecting and holding each other, and magnets 3 (3R, 3L) on the other side that can be attracted to the support 12 by magnetic force.

[0029] In this case, a plurality of fastener fittings, three in this case, are used for the fastener 2 (hereinafter, the fastener 2 is referred to as the fastener fittings 2). These fastener fittings 2 are so-called snap locks, and consist of receiving fittings 20 and hook fittings 21. The three receiving fittings 20 are attached to one side of the other cover plate 1L, in this case, adjacent to one side edge at the upper, middle, and lower parts of the front part 101L, by screwing. The three hook fittings 21 are attached to one side of the one cover plate 1R, facing each receiving fitting 20 of the other cover plate 1L, in this case, adjacent to one side edge at the upper, middle, and lower parts of the front part 101R, by screwing. In this way, the front part 101R of one cover plate 1R and the front part 101L of the other cover plate 1L are connected and fixed by the engagement of these three receiving fittings 20 and three hook fittings 21, in this case, with one side edge of each of the front parts 101R and 101L butted against each other.

[0030] In this case, mounting members 4R, 4L of each cover plate 1R, 1L are extended to the other side of the cover plate 1R and the other cover plate 1L, and magnets 3 are provided on the mounting members 4R, 4L of each cover plate 1R, 1L. Plate-shaped or rod-shaped mounting members 4R, 4L are used. In this case, stays are used for the mounting members 4R, 4L (hereinafter, the mounting members 4R, 4L are referred to as stays 4R, 4L). The stays 4R, 4L are long, thin iron plates with both ends parallel and the middle between the two ends formed at an angle. Rectangular magnet plates 3R, 3L are attached to the inner surface at the tip side of the stays 4R, 4L by screws. Two such stays 4R, 4L with magnet plates 3R, 3L are attached by fixing the base ends of each stay 4R, 4L to appropriate positions above and below the other side of each cover plate 1R, 1L, and extend horizontally from the other side of each cover plate 1R, 1L.

[0031] In this way, the cover C is attached to the core drill D by having one cover plate 1R and the other cover plate 1L arranged around the core drill body 13, connected by fastener fittings 2, and fixed to the support 12 by magnets 3.

[0032] Figure 4 shows an example of construction of core drill D using core drill D with cover C.

[0033] First, the core drill D is installed and fixed to a construction surface P of a concrete structure or the like without attaching the cover C. At the time of installing and fixing the core drill D to the construction surface P, the absence of the cover C on the core drill D makes it easier to visually confirm the center of the core drill body 13, and the core drill body 13 can be easily and reliably aligned to the center of the hole. In addition, the cover C is detachably attached to the core drill D by the magnet 3, which is also preferable in terms of the mounting strength of the cover C. Then, the core drill body 13 is disposed on one end side of the base 11 via the support 12, so the tip of the core drill body 3 is aligned toward the center of the hole drilling surface P1, and the base 1 is fixed to the construction surface P by the anchor A.

[0034] Next, the cover C is attached to the core drill D. In this case, first, the front part 101R and the right side part 102R of one cover plate 1R, and the front part 101L and the left side part 102L of the other cover plate 1L are arranged to face the front, right side and left side of the core drill body 13, respectively. In this case, both cover plates 1R and 1L of the cover C can be arranged to face the core drill body 13 from multiple directions. That is, both cover plates 1R and 1L can be arranged to face the periphery along the front, right side and left side of the core drill body 13 from the front of the core drill body 13, that is, from the front. Both cover plates 1R and 1L can be arranged to face the periphery along the front, right side and left side of the core drill body 13 from above the upper surface of the core drill body 13. In addition, one cover plate 1R can be arranged from the side of the right side of the core drill body 13 to face the periphery along the front and right side of the core drill body 13, and the other cover plate 1L can be arranged from the side of the left side of the core drill body 13 to face the periphery along the front and left side of the core drill body 13. Furthermore, by combining these cover plates 1R and 1L as described above, it is possible to arrange them to face the periphery along the front, right and left sides of the core drill body 13. Therefore, even if there is an obstacle around the drilling surface P1 on the construction surface P of the core drill D or the construction surface is narrow at the joint of two surfaces such as between the ceiling and the wall or between the floor and the wall, this cover C can be arranged around the core drill body 13 accordingly. In this way, the front part 101R of one cover plate 1R and the front part 101L of the other cover plate 1L are arranged in front of the core drill body 13, and one side edge of each front part 101R, 101L is butted against each other.

[0035] Next, these cover plates 1R, 1L are connected and fixed by three fastener fittings 2. In this case, the three hook fittings 21 of one cover plate 1R are respectively engaged with the three receiving fittings 20 of the other cover plate 1L to connect these cover plates 1R, 1L.

[0036] Then, the cover C is fixed to the support 12 by the magnets 3 of the cover plates 1R, 1L. In this case, stays 4R, 4L extend from the other side of each cover plate 1R, 1L toward both sides of the core drill D in a generally Z-shape in plan view, so that the magnet plates 3R, 3L are disposed opposite both sides of the support 12 via these stays 4R, 4L, and are attracted and fixed by the magnetic force of the magnet plates 3R, 3L. In this manner, the cover C is attached to the core drill D, and the cover C surrounds the periphery of the core drill body 13, particularly from the front to the right side and from the front to the left side.

[0037] In this way, the core drill D is driven to drill the hole on the drilling surface P1. In this case, the worker rotates the handle 15 or drives the feed motor to lower the core bit and bring the tip of the core bit into contact with the drilling surface P1 in alignment with the center of the hole. Then, while driving the rotation motor 16 to rotate the core bit, the worker operates the handle 15 to press the core bit against the drilling surface to drill the hole. During the operation of the core drill D, the periphery of the core drill body 13 is surrounded by the cover C, so that the worker's work clothes and gloves do not touch the rotating core drill body 13, and the worker's work clothes and gloves are not caught in the rotating core drill body 13. In addition, even if sheets and ropes installed at the construction site are blown away by external forces such as strong winds and collide with the core drill D, the cover C surrounding the core drill body 13 prevents these sheets and ropes from being caught in the rotating core drill body 13.

[0038] When drilling into the working surface P, drilling debris remains in the core bit, so each time, the core drill body 13 is raised above the drilling surface, the core bit is pulled up from below the drilling surface, and the drilling debris is pulled out.

[0039] Construction using the core drill D is carried out in this manner, and the cover C attached to the core drill D ensures the safety of the worker operating the core drill body 13.

[0040] After construction using the core drill D, the core drill D is removed from the construction surface. In this case, first, the main cover C is removed from the core drill D, and then the core drill D is removed from the construction surface. In particular, when removing the main cover C from the core drill D, the magnet plates 3R, 3L of each cover plate 1R, 1L are pulled away from the support 12, and the cover plate 1 is removed from the core drill D. The main cover C can also be easily removed from the core drill D.

[0041] As described above, the cover C is made of aluminum and is composed of a cover plate 1 that opens a part facing the support 12 and surrounds the remaining part of the outer circumferential surface of the core drill body 13. The cover plate 1 is divided in the circumferential middle of the outer circumferential surface of the core drill body 13, and includes one cover plate 1R and the other cover plate 1L. The one cover plate 1R and the other cover plate 1L each have a fastener metal fitting 2 on one side that connects and holds the one cover plate 1R and the other cover plate 1L to each other, and a magnet 3 on the other side that can be attracted to the support 12 by magnetic force. The one cover plate 1R and the other cover plate 1L are arranged around the core drill body 13, connected by the fastener metal fitting 2, fixed to the support 12 by the magnet 3, and attached to the core drill D. Since the outer peripheral surface of the core drill body 13 is surrounded by the cover plate 1 in this way, even if the worker's hand approaches the core drill body 13 during work using the core drill D, the worker's work clothes, gloves, etc. will not touch and be caught in the rotating core drill body 13. Also, even if various materials and parts necessary for construction such as sheets and ropes are scattered by external forces such as strong winds at the construction site, they will not be caught in the rotating core drill body 13 during work using the core drill D. In this case, the outer peripheral surface of the core drill body 13 is surrounded by one cover plate 1R and the other cover plate 1L, and each cover plate 1R and 1L is fixed and connected with a fastener fastening metal fitting 2, so that it can be arranged on the core drill body 13 from both the left and right sides or from above, and the cover plate 1 can be easily attached to the core drill body 13 from any direction. Since each of the cover plates 1R, 1L is fixed to the support 12 by the magnet plates 3R, 3L of each of the cover plates 1R, 1L, each of the cover plates 1R, 1L can be easily attached to and detached from the core drill body 13. Therefore, drilling work using the core drill D can be performed safely in the same manner as with the conventional core drill D without changing the device configuration of a general core drill D, and in any construction surface, workers can perform the same work as with the conventional core drill D without any complicated work.

[0042] Furthermore, the cover C has the following advantages. (1) At least one surface of the cover plate 1 has a plurality of through holes 104 so that the inside can be seen from the outside of the cover plate 1. This allows the state of the core drill body 13 on the inside from the outside of the cover plate 1 and the state of the drilling of the construction surface by the core drill body 13 to be visually observed, and the construction status by the core drill D to be visually confirmed. Therefore, the drilling work using the core drill D can be performed in the same manner as in the conventional case. (2) In one cover plate 1R and the other cover plate 1L, a plurality of through holes 104R, 104L are provided on each surface corresponding to both sides of the core drill body 13 so that the inside can be seen through from the outside of each cover plate 1R, 1L. This allows the state of the core drill body 13 on the inside from the outside of each cover plate 1R, 1L and the state of drilling the construction surface by the core drill body 13 to be visually confirmed. In other words, in this case, the state of the core drill body 13 and the state of drilling the construction surface by the core drill body 13 can be visually confirmed from both the left and right sides of each cover plate 1R, 1L, and the visibility of the construction status by the core drill D can be further improved. Therefore, the drilling work using the core drill D can be performed in the same manner as before. (3) The cover plate 1 is formed with a U-shaped cross section so that one surface facing the outer circumferential surface of the core drill body 13 and adjacent to the support 12 is open and can enclose the remaining portion. This makes it easy to cover the periphery of the core drill body 13, and the cover plate 1 can be easily attached to the periphery of the core drill body 13 and can also be easily removed. In this case, in particular, the cover plate 1 is divided at the circumferential center of the outer peripheral surface of the core drill body 13, and one cover plate 1R and the other cover plate 1L are formed symmetrically with respect to the position of division. This allows each cover plate 1R, 1L to be arranged on the core drill body 13 from the front facing the support 12, from both the left and right sides, or from above, and the cover plate 1 can be attached to the core drill body 13 from any direction, and can also be removed in the same way. (4) Stays 4R, 4L that form mounting members for the cover plates 1R, 1L are extended to the other sides of the cover plate 1R and the other cover plate 1L, and magnets 3R, 3L are provided on the stays 4R, 4L of the cover plates 1R, 1L. This allows the cover C to be easily fixed and attached to the core drill D and easily removed.

[0043] In this embodiment, the cover plate 1 is fixed to the support 12 of the core drill D by the magnet 3, but it goes without saying that it can be fixed by screwing. In this case, the attachment and detachment of the cover plate 1 to and from the support 12 is a complicated task compared to the magnet 3, but even in this case, it is possible to obtain substantially the same effects as the above embodiment.

[0044] In this embodiment, the cover C is detachably attached to the core drill D, but the cover C may be attached integrally to the core drill D to provide a core drill with a cover. Even in this case, the same effects as those of the above embodiment can be achieved. [Explanation of symbols]

[0045] D Core Drill 11. Base 110 Pillar mounting part 111 Anchor insertion part 12 pillars 121 Luck 13 Core drill body 14 Slide Block 140 Pinion 141 Block body 142 Holder 15 Handle 16 RPM motor 161 Rotational axis 17 Core Bit 170 Connection part 171 Blade C Main cover (Core drill cover) 1 Cover plate 10 Open surface 1R One cover plate 101R Front part 102R Right side part 103R opening 1L The other cover plate 101L front part 102L Left side part 103L opening 104(104R, 104L) Through hole 1040 Punching metal 2 Zipper fastener (fastener) 20 Bracket 21 Hanging hardware 3. Magnet 3R, 3L magnet plate 4R, 4L Stay (mounting material) P construction side P1 drilling surface

Claims

1. A core drill cover for a core drill comprising: a base that is removably installed and fixed on a concrete structure or the like; a support post that is vertically installed on the base and has a rack attached thereto; a slide block that has a pinion that meshes with the rack and is attached to the support post so that it can be raised and lowered; a handle that is provided on the slide block and that rotates the pinion or a feed motor that rotates the pinion; a rotation motor mounted on the slide block; and a core drill body that is operatively connected to the rotation motor and has a core bit that is arranged in parallel with the support post, and the core bit is rotated by the rotation motor to drill a hole in a concrete structure or the like by operating the handle or driving the feed motor, a cover plate that encloses the remaining portion of the outer circumferential surface of the core drill body and opens a portion thereof facing the support pillar; The cover plate is divided at a circumferential middle of the outer peripheral surface of the core drill body to include one cover plate and the other cover plate, each of the one cover plate and the other cover plate has a fastener on one side for connecting and holding one side of the one cover plate and one side of the other cover plate to each other, and has a magnet on the other side capable of being attracted to the support by magnetic force; The one cover plate and the other cover plate are arranged around the core drill body, connected by the fastener, fixed to the support by the magnet, and attached to the core drill. A cover for a core drill.

2. 2. The core drill cover according to claim 1, wherein at least one surface of the cover plate has a plurality of through holes through which the inside of the cover plate can be seen from the outside.

3. 2. A core drill cover according to claim 1, wherein the first and second cover plates have a plurality of through holes on each surface corresponding to both sides of the core drill body, so that the inside of each cover plate can be seen from the outside.

4. 2. The core drill cover according to claim 1, wherein the cover plate is formed in a U-shaped cross section so that one surface facing the outer circumferential surface of the core drill body adjacent to the support pillar is open and the remaining portion can be enclosed.

5. 5. A core drill cover as described in claim 4, wherein the cover plate is divided at the circumferential center of the outer peripheral surface of the core drill body, and one cover plate and the other cover plate are formed symmetrically with respect to the division position.

6. 6. A core drill cover according to claim 4, wherein mounting members for each of the cover plates extend from the other ends of the one cover plate and the other cover plate, and a magnet is provided on the mounting members for each of the cover plates.

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