Dust scattering preventive attachment for electric drill

Abstract

To provide a dust scattering preventive attachment for an electric drill that is configured to reduce injuries caused by dust generated in work for drilling a wall or the like in equipment work in particular, which can suppress human bodies from being injured by asbestos-containing construction materials for a building containing asbestos, in particular can minimize scattering of dust when disposing collected dust.SOLUTION: A dust scattering preventive attachment for an electric drill according to the present invention utilizes a cylindrical body, a slidable storage body and a soft elastic body with flexibility, for the electric drill. The slidable storage body is constituted of elastic raw materials. which connects the cylindrical body to a main body of the electric drill. The slidable storage body is formed in a truncated-cone shape spreading toward one side. A plurality of concave grooves are slidably connected on an outer peripheral surface of the slidable storage body, and an inner peripheral surface of the slidable storage body has a surface property in which grooves are smoothly joined.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a technology for a dust-prevention attachment for an electric drill, and more particularly to an attachment for a container that collects all scattering dust produced by a drill or hole saw when drilling a hole in a wall or the like, and more particularly to a dust storage container that can minimize scattering of dust even when removing dust from the dust storage container. [Background technology]

[0002] Asbestos has long been known to have adverse effects on the human body, but awareness of the problem has been growing since national regulations were established about 50 years ago, and efforts have been made to prevent damage by setting limits on asbestos content, etc. However, many of the buildings currently being demolished or refurbished were built before the regulations were put into place, and health damage to workers continues to occur. In addition, the health damage caused by asbestos dust affects not only workers doing the work, but also residents and pedestrians living near work sites due to scattering of asbestos dust.

[0003] The problem of asbestos is particularly bad when asbestos dust is inhaled through the mouth or nose and enters the human body, but it is particularly serious when installing air conditioners, where the worker directly touches walls and ceilings that contain asbestos to drill holes. The drilling work for installing air conditioners is manual work using a drill or other tool, and dust is inevitably inhaled during the drilling work or when disposing of the dust collected during the work. Therefore, it can be said that some kind of ingenuity is needed to solve this problem.

[0004] Specifically, the work of installing air conditioner piping involves first drilling a hole with an inner diameter of about 65 to 80 mm using an electric drill or other power tool. Then, the building materials used in the wall with an inner diameter of about 65 to 80 mm will break into fragments and powder. The dust will also scatter to the wall on the side where the worker is working and to the wall on the opposite side from the wall where the worker is working. As a result, not only the worker but also passersby on the opposite side, for example, will inhale the dust. In particular, for workers, this is a task that is repeated many times a day, and they will inhale asbestos even when wiping off the dust on the wall or tools that have been scraped. In addition, if this is repeated every day, the amount of dust inhaled will not be small, and the adverse effects on the human body will be great. And if a worker continues to work for a long time in a job that may inhale asbestos, the inhaled asbestos will remain in the lung tissue for a long time, which makes them more susceptible to asbestosis and lung cancer. It can be said that measures to reduce such health damage as much as possible are necessary.

[0005] Furthermore, taking these current circumstances seriously, the government has finally begun to take action, with the Ministry of Health, Labor and Welfare announcing that from April 1, 2022, it will be mandatory to report the results of advance investigations into the presence or absence of asbestos, and that measures must be taken to prevent it from scattering.As a result, there is an urgent need to provide equipment and methods that prevent the inhalation of asbestos dust.

[0006] In view of these problems, various technical proposals have been made in the past. For example, there is a technology entitled "Asbestos Removal Method and Peeling Coating Material Recovery System" (see Patent Document 1). Specifically, the proposal is to "provide an asbestos removal method capable of removing the coating material remaining on the surface of the base adjustment layer when the coating layer is peeled off, without scattering asbestos. The problem is to remove asbestos from a structure B having a concrete layer 12, a base adjustment layer 11 formed on the surface of the concrete layer 12, and a coating layer 10 formed on the surface of the base adjustment layer 11 and made of a coating material containing asbestos, the method including a stripping agent application step of applying a stripping agent 41 to the surface of the coating layer 10 to cause the stripping agent 41 to penetrate into the coating layer 10, a coating layer removal step of removing the coating layer 10 into which the stripping agent 41 has penetrated by the stripping agent application step with a scraper 71, and a residual coating material removal step of removing the coating material remaining on the base adjustment layer 11 by polishing the surface of the base adjustment layer 11 while supplying a liquid for suppressing asbestos scattering to the polishing area 11b. The invention described in Patent Document 1 can be said to have an effect that is partially common to the present invention in that asbestos is removed without scattering. However, Patent Document 1 relates to a method for removing a coating layer containing asbestos, and does not address the scattering of dust that occurs during cutting.

[0007] There is also a technology with the invention title "Dust collecting device" (see Patent Document 2). Specifically, the objective is to "provide a technology that contributes to the miniaturization of a dust collecting device configured to be detachable from a drilling tool," and the solution is as follows: "The dust collecting device 5 comprises a main body 51, a dust storage section 6, a sliding section 7, a dust transfer path 80, and a tool connection path 87. The main body 51 is detachable from the lower side of the main body 10 of the hammer drill 1. The dust storage section 6 has a first opening 671 as an inlet, a filter 60, an accommodation space 610, and a second opening 672 as an outlet. The sliding section 7 is attached to the main body 51 so as to be slidable in the front-rear direction within the internal space 52. The dust collecting device 5 is held in the sliding portion 51. The dust transfer path 80 extends inside the sliding portion 7 and connects the suction port 712 and the first opening 671. The tool connection path 87 is disposed in the internal space 52 and connects the second opening 672 and the first intake port 111 of the hammer drill 1 when the dust collecting device 5 is attached to the hammer drill 1. The filter 60 is disposed in front of the first opening 671." However, the invention described in the document is a so-called dedicated device and cannot be used as an attachment for existing electric drills, drivers, etc. Also, it differs from the present invention which can be supplied at low cost.

[0008] There is also a technology with the title of the invention "electric drill device and suction device" (see Patent Document 3). Specifically, the objective is to "provide an electric drill device and suction device that can easily perform cleaning work and does not cause a work burden," and the solution is "an electric drill device equipped with an electric drill and a suction device having a vertically movable cylinder, the cylinder having a cover part that covers the shaft and bit of the drill and a branch cylinder provided in the middle of the cover part, which can be moved up and down according to the operation of the electric drill, a hose extending from the suction machine main body and the branch cylinder are connected, and the suction machine main body is equipped with a backpack to make it portable." However, the invention described in Patent Document 3 has a significantly different structure of the wall hanging material erected on the base, and further, the technology described in Patent Document 3 requires a large-scale suction device, which causes a problem of lack of convenience. [Prior art documents] [Patent documents]

[0009] [Patent Document 1] JP 2022-006896 A [Patent Document 2] JP 2019-63890 A [Patent Document 3] JP 2016-129913 A Summary of the Invention [Problem to be solved by the invention]

[0010] The present invention aims to reduce damage caused by dust, particularly when drilling holes in walls and the like during facility construction work, and is capable of reducing damage to the human body caused by asbestos-containing building materials in buildings, and in particular, to minimize scattering of dust when it is disposed of after it is collected. [Means for solving the problem]

[0011] The dust prevention attachment for an electric drill according to the present invention is a dust prevention attachment for an electric drill that utilizes a cylindrical body, a sliding housing, and a flexible elastic body, wherein the sliding housing is made of an elastic material and connects the main body of the electric drill to the cylindrical body, the shape of the sliding housing is a truncated cone that widens towards one side, the outer peripheral surface of the sliding housing is circumferentially connected with a plurality of annular concave grooves, and the inner peripheral surface of the sliding housing has a smoothly connecting surface profile.

[0012] In addition, the sliding housing according to the present invention may have a configuration in which a bearing is provided on the cylindrical body at the drill side end.

[0013] Moreover, the present invention can also employ a configuration in which the sliding container expands and contracts by sliding inside the cylindrical body.

[0014] In addition, the present invention may employ a configuration in which the sliding container expands and contracts by rolling up one end portion relative to the cylindrical body.

[0015] Furthermore, the present invention can also employ a configuration in which the bearing is equipped with an tolerance function for accommodating shafts of different diameters, the tolerance function consisting of an outer part and an inner part rotatably fitted within the outer part, the inner part having a split part in a semicircle and a plurality of protrusions in the other semicircle to hold the rotating shaft. Effect of the Invention

[0016] The dust-prevention attachment for an electric drill according to the present invention makes it possible to completely prevent scattering of dust such as asbestos that falls from the cutting edge using a simple tool, thereby providing the excellent effect of preventing damage to the health of workers, etc.

[0017] Furthermore, the dust-prevention attachment for an electric drill according to the present invention has the excellent effect of allowing dust to be easily wiped away when dealing with it after work.

[0018] Furthermore, the dust prevention attachment for electric drills according to the present invention is attached to the edge of the container by pressing it against the uneven wall surface using a detachable elastic body, so that it can be removed and used as a lid for the used cylinder, thereby providing the excellent effect of further preventing asbestos from scattering when it is disposed of.

[0019] Furthermore, the dust-prevention attachment for an electric drill according to the present invention has a simple structure, which makes it possible to reduce manufacturing costs and is suitable for mass production, which is an excellent effect. [Brief description of the drawings]

[0020] [Figure 1] 1 is a diagram illustrating a basic configuration of a tool used in a dust-scattering prevention attachment for an electric drill according to the present invention; [Diagram 2]1 is an explanatory diagram illustrating an embodiment of a sliding container of a dust-scattering prevention attachment for an electric drill according to the present invention; [Diagram 3] 1 is an explanatory view illustrating a first embodiment of a sliding container of a dust scattering prevention attachment for an electric drill according to the present invention; FIG. [Figure 4] 11 is an explanatory view illustrating a second embodiment of a sliding container of a dust scattering prevention attachment for an electric drill according to the present invention; FIG. [Diagram 5] 13 is an explanatory view illustrating a third embodiment of a sliding container of a dust scattering prevention attachment for an electric drill according to the present invention; FIG. [Figure 6] 10 is a bearing structure explanatory diagram illustrating a bearing portion that supports shafts of different diameters of a sliding housing in the dust-prevention attachment for an electric drill according to the present invention; FIG. [Figure 7] 1 is a diagram illustrating a working state in which the dust scattering prevention attachment for an electric drill according to the present invention is used; FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] The dust-prevention attachment 1 for an electric drill according to the present invention is a dust-prevention attachment that uses a cylindrical body 20, a sliding housing 10, and a flexible elastic body 40 for an electric drill 30, and the sliding housing 10 is made of an elastic material and connects the main body of the electric drill 30 and the cylindrical body 20. The sliding housing 10 has a shape of a truncated cone that widens toward one side, and the outer circumferential surface of the sliding housing 10 is circumferentially connected with a plurality of annular concave grooves, and the inner circumferential surface of the sliding housing 10 has a gently connected surface characteristic. The following description will be given based on the drawings. The overall shape and the dimensional shapes of the dust-prevention attachment 1 for an electric drill according to the present invention are not limited to the description given below, and can be changed within the technical concept of the present invention, that is, within the range of shapes and dimensions that provide the same operational effect.

[0022] Fig. 1 is a diagram illustrating the basic configuration of a dust-prevention attachment 1 for an electric drill according to the present invention, in which Fig. 1(a) shows each component used in the electric drill, and Fig. 1(b) shows the state in which each component is attached to the electric drill. Each component used will be described in detail below.

[0023] The dust prevention attachment 1 for an electric drill is a dust prevention attachment for an electric drill that utilizes a cylindrical body 20, a sliding housing 10, and a flexible elastic body 40, the sliding housing 10 being made of an elastic material and connecting the main body of the electric drill 30 and the cylindrical body 20, the sliding housing 10 having a basic shape of a truncated cone that widens towards one side, the outer peripheral surface of the sliding housing 10 being circumferentially connected with a plurality of annular concave grooves, and the inner peripheral surface of the sliding housing 10 having a gently connecting surface characteristic.

[0024] The drill bit 200 is a blade that is attached to the power drill 30 and rotated to drill holes in and cut objects. Roughly speaking, there are drill bits for wood, metal, concrete, and the like.

[0025] The hole saw 210 is a tool that is attached to an electric drill driver or impact driver and is used to make large holes in wood or metal that cannot be made with a drill. There are various types and sizes to suit different uses and purposes, and it is possible to make holes in wood, resin, steel plates, etc.

[0026] The sliding housing 10 is made of an elastic material such as rubber that is shaped to give a force that causes the cylindrical body 20 to slide when the drill bit 200 or the hole saw 210 cuts into the wall K and penetrates therethrough, and always returns to its original state even if it is stretched or crushed, or is configured to slide inside the cylindrical body 20, or is configured so that the end of the sliding housing 10 rolls up. There are dust covers available on the market that are entirely bellows. However, although this also allows free expansion and contraction by the bellows, it can be said that this also involves a maintenance problem in that dust P gets into the unevenness of the bellows and becomes difficult to remove. Therefore, in the present invention, the inner surface of the sliding housing 10 is made to have a surface property with as few unevenness as possible, which is the greatest technical feature.

[0027] The cylindrical body 20 is made of a transparent material, covers the drill bit 200 or the hole saw 210, and serves as a container for containing dust P generated from the cutting edge, and moves back and forth relative to the drill bit 200 or the hole saw 210 via the sliding container 10. A flange portion 41 is provided at the tip end of the cylindrical body 20 for clamping an elastic body 40 between the tip of the cylindrical body 20 and a wall or the like. The transparent material is used so that the discharge state of dust can be visually observed from the outside.

[0028] The electric drill 30 is an electric tool whose main purpose is to drill holes. In the present invention, existing electric drills and drivers that are generally available on the market can be used. The electric drill 30 is composed of a motor, a reducer, and a drill chuck, and is classified as a "portable electric drill" in JIS C9605. In terms of function, it is a portable version of a "drill press." Currently, models with double insulation, in which the machine body is also made of an insulating material, are mainstream. It is the most popular portable electric tool, and is also called an electric drill 30, or simply an electric drill, electric dollar, drill, or drill driver. When the electric drill 30 was invented, it was a dedicated electric tool that attached a drill bit 200 and rotated in the forward direction to drill holes in wood or metal. After that, various functions were added to the main body, and the number of tools that could be attached to the tip became abundant, expanding the range of work. As a result, various work such as drilling, tightening, loosening, polishing, and grinding became possible, and the name became various electric drills 30 that additionally indicated the functional performance.

[0029] The elastic body 40 is a ring-shaped material corresponding to the flange 41 provided at the tip of the cylindrical body 20, and is an elastic material that is sandwiched between the wall surface K to be cut by adhesion and is then pressed against the wall surface K, so that it deforms in accordance with the uneven shape of the wall. Specifically, for example, there is the fluffy urethane used in daily life. The raw material, synthetic resin such as polyurethane, is foamed and processed into a sponge-like shape, which is then cut into a shape according to the purpose, and is called a "urethane sponge" or "urethane" for short. Similarly, urethane sponges made of polyurethane are made in various hardness and shapes such as "soft urethane foam," "hard urethane foam," and "low-resilience urethane foam" by changing the degree of foaming and the manufacturing method, and a major feature is that they can be selected according to the purpose of use. Urethane sponges are also called urethane foams, and foam is a material that is foamed into a sponge-like shape, and urethane sponges and urethane foams basically refer to the same thing. Furthermore, the surface of such urethane foam is rough due to foaming, and when the cylindrical body 20 is pressed against the wall surface K, it exhibits a non-slip function. In addition, a material that has flexibility and peelability by controlling the crosslink density of the silicone resin and leaving a slight free flow is also suitable. In the dust-prevention attachment 1 for an electric drill according to the present invention, when the wall surface K has an uneven surface, the elastic body 40 is sandwiched between the lower surface K and the cylindrical body 20 and pressed against the uneven surface, thereby enabling stable drilling of holes in response to the uneven surface.

[0030] The flange portion 41 is a step portion for sandwiching the elastic body 40 between the tip of the cylindrical body 20 and a wall or the like.

[0031] The reference hole 50 is the first hole drilled to guide a circular cutting tool such as a hole saw 210 when drilling the target inner wall opening hole 52 .

[0032] The guide hole 51 is a hole that guides the center of the reference hole 50 in the inner wall and the outer wall opening hole 53 that is opened through the opening hole.

[0033] The inner wall opening hole 52 is a target hole in the inner wall UK, and is a hole opened with the reference hole 50 as the center by using a circular cutting tool such as a hole saw.

[0034] The outer wall opening hole 53 is a target hole in the outer wall SK, and is a hole opened with the guide hole 51 as the center by using a circular cutting tool such as a hole saw.

[0035] The container 60 is a container that contains dust P such as asbestos without scattering it. After drilling the inner wall opening hole 52 on the inner wall side, the container 60 prevents dust P from scattering outside the outer wall when drilling the guide hole 51 by the drill bit 200, and also serves as a lid that closes one end of the cylinder when the cylinder is removed after use.

[0036] The adhesive gel 100 is a jelly-like semi-solid material that has the flexibility of a liquid and the elasticity of a solid, and is used to adhere to the flange portion 41 of the cylindrical body 20 or the wall surface K of the elastic body 40 as needed.

[0037] Wall surface K is a flat building material that constitutes a wall, whether it is an exterior or interior wall. In a typical house, there are exterior wall SK and interior wall UK that sandwich stud M inside the wall, and when drilling a hole for an air conditioner duct, it is necessary to drill a hole that penetrates the exterior wall SK and the interior wall UK.

[0038] Dust P is a solid particle of dust-like fineness suspended in air, and is defined by the International Organization for Standardization as "solid suspended matter with a particle size of less than 75 μm." Dust P containing asbestos, which can have a significant impact on the health of workers if inhaled, is particularly problematic.

[0039] Fig. 2 is an explanatory diagram of an embodiment of a sliding housing of a dust scattering prevention attachment for an electric drill according to the present invention, Fig. 2(a) shows a first embodiment in which the sliding housing 10 is arranged in a tapered shape, a protrusion is provided on the outer surface, and the inner surface has a surface property without inner projections and recesses in an extended state, Fig. 2(b) shows a second embodiment in which the sliding housing 10 slides by a slide, and Fig. 2(c) shows a third embodiment in which the end of the sliding housing 10 rolls up and expands and contracts. The first to third embodiments will be described below with reference to Figs. 3 to 5.

[0040] As shown in Figures 3(a), 4(a), and 5(a), an elastic body 40 is pressed tightly between the inner wall UK and the cylindrical body 20 to open a reference hole 50, and an inner wall opening hole 52 is opened using a hole saw 210 guided into the reference hole 50.

[0041] Thereafter, as shown in Figures 3(b), 4(b), and 5(b), the drill bit 200 drills a guide hole 51 in the outer wall SK. At this time, the outer wall SK is covered with a collection layer 60 to contain the dust P. When the drill bit 200 penetrates the outer wall, the cutting of the drill bit 200 is stopped.

[0042] Although not shown in the drawings, the container 60 is then removed from the outer wall, and the elastic body 40 is pressed against the outer wall SK from the outside to bring the outer wall SK and the cylindrical body 20 into close contact with each other without any gaps, while the drill bit 200 is guided into the guide hole 51, and the outer wall opening hole 53 is opened in the outer wall SK with the hole saw 210.

[0043] 3A and 3B are diagrams for explaining a first embodiment of the sliding housing 10 of the dust scattering prevention attachment for an electric drill according to the present invention, in which Fig. 3A shows the sliding housing in the first embodiment being extended and the reference hole 50 being opened, and Fig. 3B shows the state in which the inner wall opening hole 52 is opened in the inner wall UK by the hole saw 210 and the guide hole 51 is opened in the outer wall SK after that, with the sliding housing 10 being in a contracted state. As a specific example, the structure of the sliding housing 10 is similar to that of a folding funnel (silica gel) provided by SHULLIN Co., Ltd.

[0044] Fig. 4 is an explanatory diagram for explaining a second embodiment of the sliding housing of the dust scattering prevention attachment for an electric drill according to the present invention, Fig. 4(a) shows the state where the reference hole 50 is opened in the sliding housing 10 in the second embodiment in an extended state, and Fig. 4(b) shows the state where the inner wall opening hole 52 is opened in the inner wall UK by the hole saw 210 and the guide hole 51 is opened in the outer wall SK after that. It is also shown that the sliding housing 10 is in a contracted state at this time.

[0045] Fig. 5 is an explanatory diagram for explaining a third embodiment of the sliding housing of the dust scattering prevention attachment for an electric drill according to the present invention, Fig. 5(a) shows the reference hole 50 being opened in the inner wall UK when the sliding housing in the third embodiment is in an extended state, and Fig. 5(b) shows the inner wall opening hole 52 being opened in the inner wall UK by a hole saw 210, and further the guide hole 51 being opened in the outer wall SK. It is also shown that the sliding housing 10 is in a contracted state at this time.

[0046] FIG. 6 is a bearing structure explanatory diagram illustrating a bearing portion that supports shafts of different diameters of a sliding housing in a dust-scattering prevention attachment for an electric drill according to the present invention.

[0047] The bearing 70 is a so-called bearing, and is a member that rotatably supports the end of a hole saw or a drill bit. Generally, a ball bearing, a needle bearing, or the like is considered.

[0048] Since the diameter of a typical hole saw is 10 mm or 11 mm, it is desirable for the different diameter shaft 71 to be compatible with these two types of shaft diameters. Therefore, it is preferable to be able to chuck even when the diameters are different between these two types.

[0049] The tolerance function 72 is a function for bearing shafts of different diameters, specifically, a bearing that can accommodate diameters of 10 mm and 11 mm. Specifically, as shown in Fig. 6, the shaft is held by a number of protrusions, and the shaft core can be adjusted by using a material having elasticity for the bearing 70. For example, by using two-color molding in which the protrusions that hold the shaft are made of a resin with high elasticity and the base part is made of a hard resin, the necessary hardness and elasticity can be given to the necessary parts.

[0050] As shown in FIG. 6, the outer portion 73 is a member that functions to connect the sliding container 10 and the rotation shaft of the hole saw 210, and that accommodates the inner portion 74 therein so as to be rotatable.

[0051] As shown in FIG. 6, the inner part 74 is a member that is rotatably disposed inside the outer part 73 and serves to connect with the rotation shaft of the hole saw 210. As shown in FIG.

[0052] The split portion 75 is a portion where a part of the shaft hole of the inner part 74 is split. In the case of a shaft with a large diameter, the split portion 75 is pushed open and inserted, whereas in the case of a shaft with a small diameter, the split portion is inserted as is along the shaft hole without pushing open the split portion.

[0053] The protrusion 76 is a portion in which a plurality of protrusions are provided in a portion of the shaft hole of the inner part 74. The protrusion 76 is elastically expanded in accordance with the shaft diameter, thereby correcting the shaft center. This indicates that it is in a contracted state.

[0054] Next, the procedure common to the first to third embodiments will be described with reference to steps A to J.

[0055] The process A for attaching the container and the adhesive is a process for adhering the adhesive gel 100 and the container 60 to the outer wall SK at a position where the guide hole 51 is planned from the outer wall side SK. In detail, the elastic body 40 is sandwiched between the container 60 and the outer wall SK, and the elastic body 40 is deformed along the surface shape of the outer wall SK. At this time, the container 60 that can cover the guide hole 51 when it penetrates and protrudes is adhered to the outer wall SK with the adhesive gel 100 or the like.

[0056] The inner wall pressing process B is a process in which the elastic body 40 attached to the flange portion 41 is crushed and deformed to conform to the shape of the surface of the workpiece to be cut, such as the inner wall, thereby eliminating any gap between the cylindrical body 20 and the workpiece to be cut, such as a wall.

[0057] The inner wall reference hole drilling process C is a process of drilling a reference hole 50 for guiding the center of the target hole.

[0058] The inner wall circular cutting process D is a process of drilling a large diameter hole in the inner wall UK by using a hole saw 210 guided by the reference hole 50 drilled in the reference hole drilling process C.

[0059] The outer wall guide hole drilling process E is a process of drilling a reference hole 50 in the outer wall SK to guide the center of the target hole to be drilled, after holes are drilled in the inner wall UK in the reference hole drilling process C and the circular cutting process D.

[0060] The process F of removing the container and the adhesive body is a process of peeling off and removing the container 60 and the elastic body 40 attached in the process A of attaching the container and the adhesive body.

[0061] The inner wall sealing step G is a step of closing the large-diameter inner wall opening hole 52 opened in the inner wall UK by the inner wall circular cutting step D. Although not particularly shown in the drawings, such a covering member may be a vinyl sheet with adhesive or the like.

[0062] The outer wall pressing process H is a process in which the elastic body 40 is crushed around the guide hole 51 provided in the outer wall SK, and deformed to conform to the shape of the surface of the workpiece to be cut, such as a wall, thereby eliminating any gap between the cylindrical body 20 and the workpiece to be cut, such as the wall.

[0063] The outer wall circular cutting process I is a process in which a large diameter outer wall opening hole 53 is drilled in the workpiece to be cut, such as an outer wall, guided by the guide hole drilled in the guide hole drilling process E.

[0064] The covering member peeling process J is a process of peeling off the vinyl sheet or the like attached to the inner wall opening hole 52 sealed in the inner wall sealing process G. After going through the above steps, the construction is completed. Thereafter, the container 60 is attached as a lid to one end of the removed cylindrical body 20, and a lid is also attached to the other end, and the cylindrical body 20 is disposed of in a sealed state.

[0065] Fig. 7 is an explanatory diagram of the working state of the dust scattering prevention attachment 1 for an electric drill according to the present invention, Fig. 7(a) shows the state where the reference hole 50 is first drilled from the inside of the inner wall toward the outer wall, Fig. 7(b) shows the state where the inner wall opening hole 52 is drilled by the hole saw 210, and Fig. 7(c) shows the state where the drill bit 200 is then penetrated into the outer wall SK to open the guide hole 51. Fig. 7(d) shows the state where the drill bit 200 is guided around to the outside and guided into the guide hole 51 in the outer wall to open the large-diameter inner wall opening hole 53. [Industrial Applicability]

[0066] The present invention solves the problem of significant damage to the health of workers caused by inhaling asbestos dust, and also makes it possible to reduce environmental damage caused by dust not only to workers but also to those in the surrounding area where they are working. In particular, since the waste disposal process after collection of dust can be minimized, it is believed that the present invention has great industrial applicability. [Explanation of symbols]

[0067] K Wall UK interior wall SK exterior wall P dust 1. Dust prevention attachment for electric drill 10 Sliding container 20 cylinder 30 Electric drill 40 Elastic Body 41 Flange 50 Reference hole 51 Guide hole 52 Inner wall opening hole 53 Exterior wall opening hole 60 Containment Unit 70 Bearings 71 Different diameter shaft 72 Tolerance Function 73 Outer part 74 Inner part 75 Waribe 76 Protrusion 100 Adhesive Gel 200 Drill Bits 210 Hole Saw

Claims

1. Electric drill (30), A cylindrical body (20); A sliding container (10); A dust scattering prevention attachment utilizing a flexible elastic body (40), The sliding container (10) is made of an elastic material, The main body of the electric drill (30) is connected to the cylindrical body (20), The shape of the sliding container (10) is a truncated cone that widens toward one side, The outer circumferential surface of the sliding container (10) is circumferentially connected with a plurality of annular concave grooves, The dust scattering prevention attachment (1) is characterized in that the inner peripheral surface of the sliding container (10) has a gently sloping surface property.

2. 2. The dust-prevention attachment (1) according to claim 1, characterized in that the sliding housing (10) is provided with a bearing (70) on the cylindrical body (20) at the drill side end.

3. 3. The dust scattering prevention attachment (1) according to claim 1 or claim 2, characterized in that the sliding container (10) is configured to expand and contract by sliding inside the cylindrical body (20).

4. 3. The dust scattering prevention attachment (1) according to claim 1 or claim 2, characterized in that the sliding container (10) expands and contracts by rolling up one end of the sliding container (10) relative to the cylindrical body (20).

5. The dust-scattering prevention attachment (1) according to claim 2, characterized in that the bearing (70) is a bearing (70) equipped with an tolerance function (72) for accommodating a different diameter shaft (71), the tolerance function (72) consisting of an outer part (73) and an inner part (74) rotatably fitted thereto, the inner part having a split part (75) in a semicircle and a plurality of protrusions (76) in the other semicircle to form a bearing (70) for holding a rotating shaft.

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