Asbestos-compatible core drill, its positioning tool, and method for collecting samples for asbestos testing

Abstract

To provide an asbestos-compatible core drill and its positioning tool, which suppress the diffusion of asbestos dust into the air. [Solution] The asbestos-compatible core drill 10 comprises a cylindrical body 100 with a cutting portion 111a formed at the front end 111, a cylindrical cover 200 that covers the body 100 from the outside in the radial direction, and a support portion 300 that supports the body 100 and the cover 200. A suction passage 600 is formed in the connecting portion 400, which sucks in cutting chips generated by cutting with the cutting portion 111a from an internal body suction port 621 that opens into the internal body space 20 in the cover 200 and an internal cover suction port 631 that opens into the internal cover space 30.

Description

[Technical Field]

[0001] The present invention relates to a core drill used for a member containing asbestos, a positioning tool used for the core drill, and a method for collecting a sample for asbestos testing. [Background technology]

[0002] Conventionally, there is known a core drill having a cylindrical body, as described in Patent Document 1. This core drill is formed with a suction passage for suctioning cutting chips generated during the drilling operation. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Utility Model Registration No. 3218922 Summary of the Invention [Problem to be solved by the invention]

[0004] If the object being drilled contains asbestos, there is a risk that asbestos dust will be dispersed into the air if the cuttings are not adequately vacuumed.

[0005] An object of the present invention is to provide an asbestos-compatible core drill and its positioning tool that prevent asbestos dust from diffusing into the air, as well as a method for collecting samples for asbestos testing. [Means for solving the problem]

[0006] The present invention is an asbestos-compatible core drill comprising a cylindrical body having a cutting portion formed at its front end, a cylindrical cover that covers the body from the radial outside, and a support portion that supports the body and the cover, and a suction passage formed in the support portion that sucks in cutting chips generated by cutting by the cutting portion through one or more suction ports that open at least somewhere within the cover.

[0007] According to the present invention, the main body is enclosed within a cover, and the support part that supports the main body and the cover is provided with a suction port and a suction passage part for suctioning the inside of the cover. As a result, the cover prevents cutting chips generated by cutting the cutting part from scattering to the outside, and the cutting chips inside the cover are sucked up by the suction passage part. Therefore, even if the workpiece contains asbestos, the asbestos dust generated by the drilling process is prevented from diffusing into the air.

[0008] In addition, in the present invention, it is preferable that the one or more suction ports include a first suction port that opens into a first space formed between the cover and the main body. The first suction port sucks in cutting chips in the first space formed between the cover and the main body. This more effectively prevents cutting chips from scattering to the outside.

[0009] In addition, in the present invention, it is preferable that the support unit includes a connecting unit connecting the main body and the drill driving unit and a relative rotation unit arranged outside the connecting unit and rotatable relative to the connecting unit, a second space that is a part of the suction passage is formed between the relative rotation unit and the connecting unit, and a communicating flow path that is a part of the suction passage and connects the first suction port and the second space is formed in the connecting unit. A configuration is possible in which the main body connected to the drill driving unit by the connecting unit rotates relative to the relative rotation unit. Meanwhile, a communicating flow path that connects the first suction port and the second space is formed in the connecting unit. This makes it possible to simultaneously realize a configuration in which the main body rotates relative to the relative rotation unit and a configuration in which cutting chips are sucked through the first suction port.

[0010] In the present invention, it is also preferable that the communication flow path includes a first portion extending from the first suction port formed in the front portion of the connecting part toward the rear portion of the connecting part in a direction inclined with respect to the central axis of the main body, and a second portion extending along the central axis of the main body. In this way, the communication flow path including the first portion and the second portion is appropriately formed within a limited range within the connecting part.

[0011] In the present invention, it is also preferable that the one or more suction ports include a second suction port that opens into the space within the main body, and the second portion extends rearward from the second suction port along the central axis, thereby allowing chips to be properly sucked not only in the first space but also in the space within the main body.

[0012] In addition, in the present invention, it is preferable that the cover has a bellows portion that is expandable in the front-rear direction, and the more the bellows portion contracts in the front-rear direction, the more the main body protrudes forward from the front end of the cover. This makes it possible to properly advance the main body as cutting progresses while keeping the cover in close contact with the surface of the wall or other object to be drilled.

[0013] In the present invention, it is also preferable that the rear end of the cover is attached to the relative rotation part, thereby realizing a configuration in which the cover is supported by the relative rotation part and the main body is rotated relative to the relative rotation part.

[0014] In the present invention, it is also preferable that a through-hole is formed through the wall of the main body. By arranging the through-hole at an appropriate position, it is possible to easily remove chips generated during the drilling process through the through-hole. Furthermore, by arranging the through-hole at an appropriate position, it is possible to prevent suction inside the main body from being blocked by chips generated during the drilling process, by allowing air to circulate inside and outside the main body through the through-hole.

[0015] According to another aspect of the present invention, there is provided a positioning tool for the above-mentioned asbestos compatible core drill, which includes a flat plate member having a circular through-hole formed therein, the through-hole having a radius slightly larger than that of the main body.

[0016] According to the present invention, the body of the core drill can be appropriately positioned at the position where a hole is to be drilled.

[0017] In the present invention, it is also preferable that a groove communicating with the through hole and extending in a direction away from the through hole is formed on the surface of the flat plate member, thereby preventing the cover from adhering tightly to the positioning tool and becoming difficult to remove after the work is completed.

[0018] Another aspect of the present invention is a method for collecting samples for asbestos testing using the above-mentioned asbestos-compatible core drill, in which a hole is drilled in the object from which the sample is to be collected, and the shavings remaining in the main body after the drilling are collected as the sample.

[0019] According to the present invention, it is possible to easily collect samples while preventing the asbestos dust generated by drilling from diffusing into the air. [Brief explanation of the drawings]

[0020] [Figure 1] 1 is a left side view of a processing device including a core drill according to an embodiment of the present invention. [Figure 2] 2 is a cross-sectional view of a portion of the core drill of FIG. 1, excluding the main body of the drill, in a cross section perpendicular to the left-right direction. [Figure 3] FIG. 2 is an enlarged view of the main body portion of FIG. [Figure 4] FIG. 2 is a front view of the processing device of FIG. [Figure 5] FIG. 2 is a diagram showing a state in which the processing device of FIG. 1 is used. [Figure 6] 1 is a positioning tool for a core drill according to an embodiment of the present invention. [Figure 7] FIG. 7 is a right side view of the positioning tool of FIG. 6. DETAILED DESCRIPTION OF THE INVENTION

[0021] A processing device 1 including a core drill 10 according to one embodiment of the present invention (referred to as an asbestos-compatible core drill in the present invention) will be described below with reference to Figs. 1 to 4. The processing device 1 has the core drill 10, a drill attachment unit 40, and a drill drive unit 800. In the following, as shown in Fig. 1, the longitudinal direction of the processing device 1 will be referred to as the front-rear direction, a direction perpendicular to the front-rear direction will be referred to as the left-right direction, and a direction perpendicular to both the left-right direction and the front-rear direction will be referred to as the up-down direction. These directions are directions assuming one mode of drilling using the processing device 1, and the processing device 1 does not necessarily always follow these directions.

[0022] The core drill 10 is a drill for drilling holes in asbestos-containing building materials such as walls, floors, and ceilings. As shown in Figure 2, the core drill 10 has a main body 100, a cover 200, and a support part 300. As shown in Figures 2 and 3, the main body 100 is a cylindrical member with openings at the front part 110 and the rear part 120. An internal space 20 is formed inside the main body 100. The front part 110 has a slightly smaller diameter than the rear part 120 and is slightly shorter in the front-to-rear direction. A connecting part 400, which will be described later, is connected to the rear part 120. A female thread is formed on the inner surface of the connecting part of the rear part 120.

[0023] A cutting portion 111a is formed at the front end 111 of the front portion 110. The cutting portion 111a has, for example, a protrusion that protrudes forward, and abrasive grains made of diamond are fixed to the protrusion. The object to be processed, such as a building component, is cut by rotating the main body 100 while bringing the protrusion into contact with the object to be processed. As shown in FIG. 3, a circular through-hole 115 is formed in the side surface of the front portion 110 and penetrates the wall. The through-hole 115 is located near the connection between the front portion 110 and the rear portion 120. A through-hole 116 is formed near the front end 111 of the front portion 110. The through-hole 116 is cut in a U-shape from the front end 111 toward the rear portion 120 and penetrates the wall of the main body 100.

[0024] As shown in Fig. 2, the cover 200 is a cylindrical member that is open in the front-rear direction. The cover 200 has an expandable and contractible bellows portion 210. The bellows portion 210 is formed from a front end 220 to a rear end 230 of the cover 200. When viewed from the rear, the rear end 230 extends around the entire circumference of a circle centered on the central axis C of the main body 100, and is attached to a front end 510 of a swivel 500, which will be described later. The cover 200 covers the entire main body 100 from the outside in the radial direction relative to the central axis C. An internal cover space 30 (referred to as a first space in the present invention) is formed between the cover 200 and the main body 100.

[0025] As shown in FIG. 2 , the support part 300 has a connecting part 400, a swivel 500 (a relative rotation part according to the present invention), and a hose connection part 700. The connecting part 400 has a general cylindrical shape extending in the front-to-rear direction. The connecting part 400 has a front part 410 and a rear part 450. The front part 410 has a stepped part 420 and a convex part 430 that protrudes forward from the stepped part 420. The diameter of the stepped part 420 relative to the central axis C is larger than the diameter of the convex part 430 and slightly smaller than the maximum diameter of the swivel 500. A male thread is formed on the outer peripheral surface of the convex part 430. This male thread is connected to a female thread formed on the rear part 120 of the main body 100.

[0026] The diameter of rear portion 450 relative to central axis C is slightly smaller than the diameter of protrusion 430 and smaller than the inside of swivel 500. In addition, rear portion 450 is larger than swivel 500 in the front-to-rear direction.

[0027] The swivel 500 has a general cylindrical shape. The swivel 500 is disposed on the outside of the rear portion 450 of the connecting portion 400. The rear portion 450 of the connecting portion 400 passes through the swivel 500. The swivel 500 is rotatable relative to the connecting portion 400. A bearing 490 is housed in the swivel 500, which allows the swivel 500 and the connecting portion 400 to rotate smoothly relative to each other. The bearing 490 is supported by the connecting portion 400 with a fastener.

[0028] An attachment groove 510a for attaching the cover 200 is formed in the front end 510 of the swivel 500. The attachment groove 510a extends around the entire circumference of the front end 510 in the circumferential direction about the central axis C. The rear end 230 of the cover 200 is inserted into the attachment groove 510a around the entire circumference, thereby attaching the cover 200 to the swivel 500.

[0029] A suction passage 600 is formed within the support portion 300. The suction passage 600 has a communicating passage 610, a swivel internal space 650 (referred to as a second space in the present invention), and a descending passage 660. The communicating passage 610 is formed in the connecting portion 400 and has a central passage 620 (referred to as a second portion in the present invention), an inclined passage 630 (referred to as a first portion in the present invention), and a branch passage 640. The central passage 620 opens toward the main body internal space 20 at the front end 431 of the convex portion 430 of the connecting portion 400. This opening forms a main body internal suction port 621 (referred to as a second suction port in the present invention). The central passage 620 extends rearward from the main body internal suction port 621 along the central axis C to the middle of the swivel 500.

[0030] The inclined flow passages 630 open toward the in-cover space 30 at the front end 421 of the stepped portion 420. This opening forms an in-cover suction port 631 (referred to as a first suction port in the present invention). The inclined flow passages 630 extend from the in-cover suction port 631 toward the rear portion 450 of the connecting portion 400 in a direction inclined with respect to the central axis C, and merge with the central flow passage 620 at a portion closer to the front of the rear portion 450. As shown in FIG. 4, six inclined flow passages 630 are formed at equal intervals in the circumferential direction about the central axis C.

[0031] The branch flow passages 640 extend from the central flow passage 620 perpendicular to the central axis C and open toward the swivel inner space 650 on the outer circumferential surface of the rear portion 450. This opening forms an outlet 641. Six branch flow passages 640 are formed at equal intervals in the circumferential direction about the central axis C.

[0032] The swivel internal space 650 is a space formed between the swivel 500 and the rear part 450 of the connecting part 400. The cover internal suction port 631 communicates with the swivel internal space 650 through the inclined flow path 630, the central flow path 620, the branch flow path 640, and the discharge port 641.

[0033] As shown in FIG. 2, the downward flow passage 660 is a flow passage that penetrates the lower wall surface of the swivel 500 along the radial direction relative to the central axis C.

[0034] The hose connection part 700 protrudes from the outer periphery of the swivel 500 in a radial direction relative to the central axis C. A dust collection passage 710 is formed within the hose connection part 700. The upper end of the dust collection passage 710 communicates with the descending passage 660. A hose is connected to the hose connection part 700. The hose is connected to a dust collector. The dust collector sucks in cutting powder generated in the core drill 10 via the suction passage 600 and the dust collection passage 710.

[0035] As shown in FIG. 1 , the drill attachment part 40 is a member that connects the main body 100 and the drill driving part 800. The drill attachment part 40 extends in the front-to-rear direction. A front end part 41 of the drill attachment part 40 is connected to a rear end 451 of a rear part 450 of the connecting part 400. A rear end part 42 of the drill attachment part 40 is removably inserted into a drill chuck 810, which will be described later.

[0036] As shown in Fig. 1, the drill driving unit 800 has a drill chuck 810, a switch 820, and a main body 830. The drill chuck 810 has an insertion hole into which the drill attachment unit 40 can be inserted. The switch 820 switches the drill driving unit 800 on and off. The drill chuck 810 is fixed to the front end of the main body 830. Note that instead of a drill chuck type like the drill chuck 810 and the drill attachment unit 40, an SDS hammer chuck type may be adopted for the processing device 1. The main body 830 is supplied with power via a power cord or has a battery installed therein.

[0037] The drill driving unit 800 rotates the main body 100, which is connected to the drill chuck 810 via the connecting unit 400, in one circumferential direction about the central axis C of the main body 100.

[0038] Next, an example of how to use the processing device 1 according to the above-described embodiment will be described with reference to FIGS. 1 to 5. The following description assumes that the object to be processed is a wall. First, the main body 100, cover 200, and support part 300 of the core drill 10 are attached to each other. Note that another main body having a different diameter size or cutting part shape from the main body 100 may be used instead of the main body 100. Next, the main body 100 and the drill drive part 800 are connected via the drill attachment part 40. Next, a hose is connected to the hose connection part 700, and a dust collector is connected to the processing device 1.

[0039] Next, while pressing the front end 220 of the cover 200 against the intended location on the wall where a hole is to be drilled, the core drill 10 is pressed against the wall so that the central axis C is perpendicular to the wall surface. This causes the bellows portion 210 to contract, and the front end of the bellows portion 210 moves rearward relative to the main body 100. In response, the cutting portion 111a at the front end 111 of the main body 100 comes into contact with the intended location.

[0040] The dust collector is switched on to begin suction, and the switch 820 of the drill drive unit 800 is turned on to rotate the drill chuck 810. This activates the processing device 1, causing the cutting unit 111a to cut the wall. As the front end 220 moves rearward relative to the main body 100 due to the contraction of the bellows portion 210, the main body 100 protrudes forward relative to the front end 220 of the cover 200, and cutting of the wall progresses. Cutting chips generated by cutting with the cutting unit 111a are sucked through both the main body suction port 621 and the cover suction port 631. Cutting chips present in the main body interior space 20 are sucked through the main body suction port 621 into the central flow path 620. Cutting chips present in the cover interior space 30 are sucked through the cover suction port 631 into the inclined flow path 630. The sucked cutting chips pass through the inclined flow path 630, the central flow path 620, and the branch flow path 640, and then travel from the discharge port 641 to the swivel interior space 650. The cutting chips in the swivel inner space 650 are discharged to a dust collector via the downward flow path 660 and the dust collection flow path 710 of the hose connection part 700.

[0041] The airflow generated when suctioning cutting chips is formed through an inflow path from the opening in the front part 110 to the main body 100 and an inflow path from the through-holes 115 and 116 to the main body 100. Here, if cutting chips get stuck in the front part 110 of the main body 100, the airflow through the former inflow path may be stagnated. However, by forming an airflow through the inflow path from at least one of the through-holes 115 and 116 to the main body 100, stagnation of the entire airflow is prevented.

[0042] When the cutting section 111a has finished drilling the wall, the switch 820 of the drill motor 800 is turned off.

[0043] The shavings remaining in the front part 110 of the main body 100 are removed and collected as a sample. If the shavings are stuck inside the main body 100 and difficult to remove, for example, the shavings are removed through the through-holes 115 or 116 as necessary. For example, the tip of a screwdriver is pressed against the surface of the shavings exposed to the outside through the through-hole 116 and slid forward to pry the shavings out.

[0044] Next, a positioning tool 1000 for the core drill 10 will be described with reference to Figures 6 and 7. The positioning tool 1000 has a positioning member 1100 and a handle 1200. The positioning member 1100 has a flat plate member 1110. The flat plate member 1110 has through holes 1120 and 1130 and a groove 1150. The flat plate member 1110 is a rectangular plate-shaped member. The flat plate member 1110 is made of rubber, plastic, metal, or the like. The through holes 1120 and 1130 are circular holes that penetrate the flat plate member 1110. The through hole 1120 is formed in the upper left part of the flat plate member 1110. The through hole 1130 is formed in the lower right part of the flat plate member 1110.

[0045] The diameter of the through hole 1120 is slightly larger than the diameter of the front part 110 of the main body 100 relative to the central axis C. The positioning tool 1000 is used by passing the front part 110 through the through hole 1120. The through hole 1120 may also be used for core drills with different cutting portion shapes.

[0046] Furthermore, the positioning tool 1000 can be used for a core drill having a smaller diameter than the front part 110 of the core drill 10. The diameter of the through hole 1130 is smaller than the diameter of the through hole 1120. The through hole 1130 is used for a core drill having a smaller diameter than the front part 110 of the main body 100.

[0047] The groove 1150 has vertical grooves 1151 and 1152 and horizontal grooves 1155 and 1156. The groove 1150 is formed in a front surface 1160 of the flat plate member 1110. The vertical groove 1151 extends from the upper end 1111 of the flat plate member 1110, communicating with the through hole 1120, to the lower end 1112 of the flat plate member 1110. The horizontal groove 1155 extends from the left end 1153 of the flat plate member 1110, communicating with the through hole 1120, to the right end 1154 of the flat plate member 1110. The vertical groove 1152 extends from the upper end 1111 of the flat plate member 1110, communicating with the through hole 1130, to the lower end 1112 of the flat plate member 1110. The horizontal groove 1156 extends from the left end 1153 of the flat plate member 1110 to the right end 1154 of the flat plate member 1110, communicating with the through-hole 1130.

[0048] The handle 1200 is an inverted L-shaped member that extends downward and is fixed to the surface 1160 of the flat plate member 1110 near the lower end 1112 thereof.

[0049] The positioning tool 1000 is used as follows. As shown by the two-dot chain line in FIG. 5 , the back surface 1170 of the flat plate member 1110 of the positioning tool 1000 is brought into contact with the workpiece, such as a wall, without any gaps. Next, while holding the handle 1200, the front end 220 of the cover 200 of the processing device 1 is pressed against the front surface 1160 of the flat plate member 1110 so as to cover the through-hole 1120. Next, when the cover 200 is contracted and the main body 100 is advanced, the main body 100 penetrates the through-hole 1120 and comes into contact with the workpiece. Then, the processing device 1 is operated to cut the workpiece with the cutting unit 111a.

[0050] According to the embodiment described above, the main body 100 is covered with the cover 200, and the support part 300 that supports the main body 100 and the cover 200 is provided with the main body suction port 621 and the cover suction port 631 that suck the inside of the cover 200, as well as the suction passage 600. As a result, the cover 200 prevents the scattering of cutting chips generated by cutting by the cutting part 111a to the outside, and the cutting chips inside the cover 200 are sucked by the suction passage 600. Therefore, even if the workpiece contains asbestos, the diffusion of asbestos dust generated by the drilling process into the air is prevented.

[0051] In particular, the in-cover suction port 631 sucks cutting chips in the in-cover space 30 formed between the cover 200 and the main body 100. This more effectively prevents cutting chips from scattering to the outside.

[0052] Furthermore, it is possible to configure the main body 100, which is connected to the drill driving unit 800 by the connecting unit 400, to rotate relative to the swivel 500. Meanwhile, a communication flow path 610 that connects the in-cover suction port 631 with the swivel interior space 650 is formed in the connecting unit 400. This makes it possible to simultaneously realize a configuration in which the main body 100 is rotated relative to the swivel 500 and a configuration in which cutting chips are sucked through the in-cover suction port 631.

[0053] The communicating flow path 610 includes an inclined flow path 630 extending in a direction inclined with respect to the central axis C from the suction port 631 inside the cover formed in the step portion 420 of the connecting portion 400 toward the rear portion 450 of the connecting portion 400, and a central flow path 620 aligned with the central axis of the main body 100, so that the communicating flow path 610 including the central flow path 620 and the inclined flow path 630 is appropriately formed within a limited range within the support portion 300.

[0054] By providing the main body suction port 621 that opens into the main body internal space 20, cutting chips not only in the cover internal space 30 but also in the main body internal space 20 are appropriately sucked.

[0055] Because the cover 200 has the bellows portion 210, the cover 200 can be tightly attached to the surface of the wall or the like that is the object of drilling, while the main body 100 can be advanced appropriately as the cutting progresses.

[0056] By attaching the rear end 230 of the cover 200 to the front end 510 of the swivel 500 , a configuration is realized in which the cover 200 is supported by the swivel 500 while the main body 100 is rotated relative to the swivel 500 .

[0057] The positioning device 1000 has a circular through hole 1120 with a radius slightly larger than the front 110 of the main body 100, and a flat plate member 1110 with a through hole 1130 formed therein, so that the main body 100 of the core drill 10 or a core drill having a main body with a diameter smaller than the front 110 of the main body 100 can be appropriately positioned at the position where drilling is desired.

[0058] A groove 1150 is formed on the surface 1160 of the flat plate member 1110, which is connected to the through hole 1120 or 1130 and extends in a direction away from the through hole, thereby preventing the cover 200 from adhering to the positioning device 1000 and becoming difficult to remove after the work is completed.

[0059] By using the above-mentioned core drill 10 to drill holes in the object from which the sample is to be collected and collecting the shavings remaining inside the main body 100 after the drilling process as the sample, it is possible to easily collect samples while preventing the asbestos dust generated by the drilling process from diffusing into the air.

[0060] By forming through-holes 115 and 116 that penetrate the wall of main body 100, chips produced during the drilling process can be easily removed through through-holes 115 and 116. Furthermore, suction stagnation within main body 100 caused by chips clogging front part 110 of main body 100 during drilling can be prevented by allowing air to circulate inside and outside main body 100 through through-holes 115 and 116.

[0061] <Modification> The above is a description of a preferred embodiment of the present invention, but the present invention is not limited to the above-described embodiment, and various modifications are possible within the scope of the means for solving the problems.

[0062] For example, in the above embodiment, the main body 100 is formed with one through-hole 115 and one through-hole 116, but a plurality of each may be formed somewhere in the front portion 110.

[0063] In the above-described embodiment, bellows portion 210 is formed from front end 220 to rear end 230 of cover 200. However, it may be formed in a portion between front end 220 and rear end 230. Alternatively, a cylindrical cover without bellows portion 210 may be used instead of cover 200. In this case, it is preferable that the cover has an expandable structure. For example, the cover may be formed by connecting multiple cylindrical parts in the front-rear direction, and the entire cover may be configured to expand and contract in the front-rear direction by sliding the parts back and forth.

[0064] In the above-described embodiment, the positioning member 1100 is formed with the through holes 1120 and 1130. However, only one of the through holes may be formed, or through holes of other sizes may be formed.

[0065] An adhesive may be applied or an adhesive sheet may be attached to the back surface 1170 of the positioning member 1100. The adhesive property allows the positioning member 1100 to adhere to a wall surface or the like.

[0066] In the above-described embodiment, both the central channel 620 and the inclined channel 630 are formed in the connecting portion 400. However, a connecting portion in which only one of the central channel 620 and the inclined channel 630 is formed may be used instead of the connecting portion 400. [Explanation of symbols]

[0067] 1 Processing equipment 10 Core drill (asbestos-compatible core drill) 30 Space inside the cover (first space) 100 units 111a Cutting part 115, 116 Through holes 200 covers 210 Bellows 300 Support part 400 Connection section 500 Swivel (relative rotation part) 600 Suction passage 610 Connecting flow path 620 Central channel (second section) 621 Suction port inside the main body (second suction port) 630 Inclined channel (1st part) 631 Suction port inside cover (first suction port) 650 Swivel inner space (second space) 800 Drill drive unit 1000 Positioning Device 1110 Flat plate members 1120, 1130 through holes 1150 Groove

Claims

1. a cylindrical body having a cutting portion formed at a front end thereof; a cylindrical cover that covers the main body from the outside in the radial direction; a support portion that supports the main body and the cover, An asbestos-compatible core drill characterized in that a suction passage is formed in the support part, which sucks up cutting chips generated by cutting in the cutting part through one or more suction ports opening at least somewhere within the cover.

2. the one or more suction ports:

2. The asbestos-compatible core drill according to claim 1, further comprising a first suction port that opens into a first space formed between the cover and the main body.

3. The support portion is a connecting portion that connects the main body and a drill driving portion; a relative rotation portion disposed outside the connecting portion and rotatable relative to the connecting portion, a second space that is a part of the suction passage is formed between the relative rotation part and the connecting part, An asbestos-compatible core drill as described in claim 2, characterized in that a communicating flow path that is part of the suction passage and connects the first suction port and the second space is formed in the connecting portion.

4. The communication flow path is An asbestos-compatible core drill as described in claim 3, characterized in that it includes a first portion extending from the first suction port formed at the front of the connecting portion toward the rear of the connecting portion in a direction inclined with respect to the central axis of the main body, and a second portion along the central axis of the main body.

5. the one or more suction ports include a second suction port that opens into a space within the main body; 5. The asbestos-compatible core drill according to claim 4, wherein the second portion extends rearward from the second suction port along the central axis.

6. The cover has a bellows portion that is expandable in the front-rear direction, 2. The core drill for asbestos protection according to claim 1, wherein the more the bellows portion contracts in the front-rear direction, the more the main body protrudes forward from the front end of the cover.

7. 4. The core drill for asbestos protection according to claim 3, wherein the rear end of the cover is attached to the relative rotation part.

8. 2. The asbestos-compatible core drill according to claim 1, wherein a through hole is formed through the wall of the main body.

9. A positioning tool for an asbestos-compatible core drill according to any one of claims 1 to 8, A positioning device comprising a flat plate member having a circular through-hole formed therein, the through-hole having a radius slightly larger than that of the body.

10. 10. The positioning tool according to claim 9, wherein a groove communicating with the through hole and extending in a direction away from the through hole is formed on the surface of the flat plate member.

11. A method for collecting samples for asbestos testing, characterized in that a hole is drilled in an object from which a sample is to be collected using an asbestos-compatible core drill described in any one of claims 1 to 8, and the shavings remaining in the main body after the hole drilling are collected as a sample.

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