Suction nozzle for dust collector and dust collector for rotary tool equipped with same

Abstract

A suction nozzle for a dust collector, which can achieve both improved suction power and strength, and a dust collector for a rotary tool equipped with the same are provided. [Solution] A suction nozzle 2 for a dust collector used in a rotary tool dust collector 1 that is attached to a rotary tool 5 equipped with a core drill 4 to collect cutting chips, the nozzle having a nozzle body 21 rotatably supported on a bearing member 3 of the rotary tool dust collector 1, a drill connecting part 22 for connecting the core drill 4 to the tip of the nozzle body 21, and a rotary tool connecting part 23 for connecting the rotary tool 5 to the rear end of the nozzle body 21, the nozzle body 21 having at least one suction passage 24 that penetrates the interior of the nozzle body 21 from the tip surface on the drill connecting part 22 side, and a plurality of communication holes 25 that communicate with the suction passage 24 from the outer peripheral surface of the nozzle body 21, the communication holes 25 are aligned circumferentially of the nozzle body 21 and are arranged with their opening positions shifted alternately front to back in the axial direction.

Description

[Technical Field]

[0001] The present invention relates to a suction nozzle for a dust collector that is attached to a rotary tool having a core drill to collect cutting chips, and to a dust collector for a rotary tool that includes the same. [Background technology]

[0002] A core drill is a cylindrical drill with an open tip that is used to drill holes in concrete, etc. The tip of a core drill has a rough blade formed on it, and hard abrasive grains such as diamond powder are fixed to the surface of the blade, so that the blade and the hard abrasive grains gradually cut away the material, allowing it to drill holes in hard materials such as concrete.

[0003] Furthermore, when drilling hard objects such as concrete, friction during cutting generates heat, carbonizing the diamonds used as abrasive grains and reducing their hardness, resulting in a significant drop in cutting ability. Therefore, conventional core drills using diamond abrasive grains have typically been cooled by spraying water or other cooling agents during the process.

[0004] However, there are some workplaces where water cannot be used, and there are also concerns about environmental pollution caused by discharging water containing cutting waste.

[0005] In response to these problems, the applicant of the present application proposed in Utility Model Registration No. 3218922 a cutting tool with a dust collection function, which comprises a cylindrical core drill having a cutting blade at one end, a center member extending in the longitudinal direction of the core drill along the central axis of the core drill, and a nozzle body connecting the core drill to a rotary tool, the nozzle body having an insertion hole into which the center member is inserted, a connection part connected to the core drill, a plurality of first holes formed in the connection part, and a suction passage that sucks in cutting chips generated by cutting with the cutting blade through the plurality of first holes, and has obtained a utility model right (Patent Document 1).

[0006] This cutting tool with a dust collection function collects cutting chips while drilling, preventing them from remaining in the drilled hole and reducing heat generation due to friction with the cutting chips. Furthermore, the air used to suck up the cutting chips cools them as it passes through the tip of the core drill. Therefore, cutting tools with a dust collection function have the excellent effect of eliminating the need for cooling water and preventing environmental pollution because the cutting chips are collected in the dust collector. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Utility Model Registration No. 3218922 Summary of the Invention [Problem to be solved by the invention]

[0008] In recent years, the cutting tool with dust collection function described in Patent Document 1 has attracted attention for its above-mentioned effects, and attempts have been made to apply it not only to drilling concrete, but also to drilling exterior walls for installing air conditioners, and to collecting samples for asbestos testing conducted in advance of building demolition.

[0009] However, when drilling exterior walls, the object to be drilled is not limited to the exterior wall material, but also requires drilling through multiple layers of different building materials, such as insulation, wood such as structural plywood, gypsum board, wallpaper, etc. When drilling a single material such as concrete, the size of the cuttings generated and the gap between the core drill and the object during drilling are almost constant, and it is possible to achieve the designed suction performance for sucking up the cuttings and the cooling performance by the air passing through the gap.However, when drilling different building materials, there is variation in the size of the cuttings generated and the gap with the core drill, and there is a risk that sufficient suction performance and cooling performance will not be obtained depending on the building material.

[0010] Furthermore, when collecting samples for asbestos testing, it is necessary to reliably prevent cuttings from scattering during collection, so higher dust collection performance is required than when drilling holes in concrete.

[0011] Therefore, in order to apply this to drilling exterior walls made of multiple materials and collecting asbestos testing samples, higher suction and dust collection power than ever before is required.

[0012] On the other hand, since core drills drill holes by rotating while being pressed against the object, the nozzle body that connects the rotary tool and the core drill is subjected to a strong torque (twisting force), which poses a problem that the strength of the nozzle body cannot be reduced when improving suction power.

[0013] The present invention has been made to solve the above problems, and aims to provide a suction nozzle for a dust collector that can achieve both improved suction power and strength, and a dust collector for a rotary tool that is equipped with the same. [Means for solving the problem]

[0014] The suction nozzle for a dust collector according to the present invention is a suction nozzle for a dust collector used in a dust collector for a rotary tool that is attached to a rotary tool having a core drill to collect cutting chips, in order to solve the problem of achieving both improved suction power and suppression of a decrease in strength. The suction nozzle for a dust collector according to the present invention is a suction nozzle for a dust collector used in a dust collector for a rotary tool that is attached to a rotary tool having a core drill to collect cutting chips. The suction nozzle for a dust collector is a suction nozzle for a dust collector used in a dust collector for a rotary tool that is attached to a rotary tool having a core drill to collect cutting chips. The suction nozzle for a dust collector has a nozzle body that is rotatably supported on a bearing member of the dust collector for a rotary tool, a drill connecting part for connecting the core drill to the front end of the nozzle body, and a rotary tool connecting part for connecting the rotary tool to the rear end of the nozzle body. The nozzle body is formed with at least one suction passage that penetrates the interior of the nozzle body from the front end surface on the drill connecting part side, and a plurality of communicating holes that communicate with the suction passages from the outer peripheral surface of the nozzle body, and the communicating holes are aligned circumferentially of the nozzle body and are arranged with their opening positions shifted alternately front to back in the axial direction.

[0015] Furthermore, in order to solve the problem of achieving both improved suction power and suppressed reduction in strength, the dust collector for rotary tools according to the present invention has a suction nozzle for a dust collector and a bearing member that rotatably supports the suction nozzle for a dust collector, and the bearing member is connectable to a dust collector equipped with a suction function and has dust collection holes that communicate with each of the communication holes of the rotating suction nozzle for a dust collector. [Effects of the Invention]

[0016] According to the present invention, it is possible to improve the dust collection power while suppressing a decrease in strength. [Brief explanation of the drawings]

[0017] [Figure 1] 1 is a front view showing an embodiment of a dust collector for a rotary tool according to the present invention. [Figure 2] 1 is a cross-sectional view showing a dust collector for a rotary tool according to an embodiment of the present invention. [Figure 3] 1 is a perspective view showing a suction nozzle for a dust collector according to an embodiment of the present invention; [Figure 4] 1 is a side view of the drill connecting portion side of the suction nozzle for a dust collector of the present embodiment. FIG. [Figure 5] 10A is a schematic diagram showing the distance between adjacent connecting holes when the opening positions of the communicating holes are arranged in a line and when the opening positions of the communicating holes are arranged with alternating shifts in the front and rear directions. FIG. [Figure 6] 1 is a front view, partially in section, showing a state in which the dust collector for a rotary tool of the present embodiment is used during drilling. FIG. [Figure 7] FIG. 10 is a cross-sectional view showing another embodiment of a dust collector for a rotary tool according to the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0018] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a dust collector for a rotary tool according to the present invention will now be described with reference to the drawings.

[0019] 1 and 2, the rotary tool dust collector 1 of this embodiment has a dust collector suction nozzle 2 for sucking cutting chips g, and a bearing member 3 for rotatably supporting the dust collector suction nozzle 2. Each component will be described in detail below.

[0020] The dust collector suction nozzle 2 is a nozzle for sucking up cutting waste g generated when a wall W or the like is cut with a core drill 4, and is also a component for transmitting the rotational force of the rotary tool 5 to the core drill 4. As shown in Figures 2 and 3, the dust collector suction nozzle 2 of this embodiment has a nozzle body 21, a drill connecting portion 22 at its tip, a rotary tool connecting portion 23 at its rear end, a suction passage 24 penetrating from the tip surface on the drill connecting portion 22 side, a communication hole 25 communicating from the outer peripheral surface of the nozzle body 21 to the suction passage 24, a support protrusion 26 supporting a bearing member 3 attached to the outer peripheral surface of the nozzle body 21, and a retaining ring groove 27 for providing a retaining ring that supports the bearing member 3 together with the support protrusion 26.

[0021] The nozzle body 21 is a member formed in a substantially cylindrical shape, and in this embodiment is made of stainless steel. Note that the material of the nozzle body 21 is not limited to stainless steel, and may be appropriately selected from metallic materials having the required strength.

[0022] The drill connecting portion 22 is a portion for connecting the core drill 4 to the tip side of the nozzle body 21, and is formed in a shape corresponding to the base end 41 of the core drill 4. In this embodiment, the drill connecting portion 22 is configured by a thread formed in the shape of a male screw on the outer peripheral surface of the tip side of the nozzle body 21 so that it can be screwed into the female thread of the base end 41 of the core drill 4.

[0023] The outer diameter of the drill connecting portion 22 is selected depending on the size of the core drill 4 to be connected, and as shown in Figure 7, when connecting a relatively small core drill 4, it may be formed with a smaller diameter than the nozzle body 21.

[0024] The rotary tool connecting portion 23 is a portion for connecting the rotary tool 5 to the rear end side of the nozzle body 21, and is formed in a shape corresponding to the rotary tool 5 to be connected or a connecting tool for connecting the rotary tool 5. The rotary tool connecting portion 23 in this embodiment is configured by a female screw formed on the rear end surface of the nozzle body 21, and as shown in Fig. 6, a drill chuck 51 is screwed onto it as a connecting tool.

[0025] The rotary tool connecting portion 23 is not limited to a configuration using a female screw, and may be formed in a shape that allows direct connection to the rotary tool 5, such as having the same shape as the drill chuck 51.

[0026] The suction passage 24 is a passage for sucking chips g generated by cutting the wall W or the like from inside the core drill 4, and is composed of at least one passage that penetrates from the tip surface of the nozzle body 21 on the drill connecting portion 22 side through the inside of the nozzle body 21. In this embodiment, as shown in Figures 2 and 4, it consists of a first suction passage 24a formed with a relatively large diameter and six second suction passages 24b that open around this first suction passage 24a.

[0027] As shown in FIG. 2, the first suction passage 24a in this embodiment penetrates from the tip surface on the drill connecting portion 22 side to the vicinity of the rotary tool connecting portion 23 along the axis.

[0028] The second suction passage 24b has a smaller diameter than the first suction passage 24a, is parallel to the first suction passage 24a, and is formed to a depth that allows it to communicate with the communication hole 25.

[0029] The size and number of holes in the suction passages 24 are not particularly limited and may be selected appropriately based on the expected size and amount of cutting waste g. The suction passages 24 may extend not only through the tip surface of the drill body 21, but also from the tip surface of the support protrusion 26 to the inside of the drill body 21, as shown in Fig. 7 .

[0030] The communication holes 25 are holes for discharging to the outside the cutting chips g that have been sucked into the nozzle body 21 via the suction passage 24, and penetrate from the outer peripheral surface of the nozzle body 21 to the suction passage 24. In this embodiment, a plurality of communication holes 25 are formed to increase the opening area, thereby suppressing air pressure loss and improving suction performance. Specifically, six communication holes 25 are formed, and one communication hole 25 is connected to one second suction passage 24b.

[0031] In addition, in this embodiment, as described above, in order to increase the opening area by using multiple communicating holes 25 while suppressing a decrease in strength, the communicating holes 25 are arranged along the circumferential direction of the nozzle body 21 and are arranged with their opening positions shifted alternately front and back in the axial direction.

[0032] 5, when comparing a case in which the communication holes 25 are arranged in a line in the circumferential direction with a case in which connecting holes 25 of the same size are arranged with their opening positions shifted alternately front and rear, the opening area is the same in both cases, but compared to the distance D1 between adjacent connecting holes 25 when they are arranged in a line, the distance D2 between adjacent connecting holes 25 when they are arranged with their opening positions shifted alternately front and rear is wider, and the cross-sectional area between the holes is larger. Therefore, the nozzle body 21 has stronger strength when the connecting holes 25 are arranged with their opening positions shifted alternately front and rear, and it is possible to suppress a decrease in strength due to an increase in the opening area.

[0033] The number and size of the communication holes 25, the distance at which they are alternately shifted forward and backward, and the like are not particularly limited, and may be selected appropriately depending on the required opening area and required strength.

[0034] The support protrusion 26 is a protrusion for supporting the tip end of the bearing member 3 when the bearing member 3 is attached to the nozzle body 21, and is formed so as to protrude outward from the outer circumferential surface of the nozzle body 21, toward the tip end of the opening of the communication hole 25. As shown in Figures 3 and 4, the support protrusion 26 in this embodiment is formed with a generally hexagonal cross section, and is formed so as to be able to be gripped with a wrench or the like to prevent the nozzle body 21 from rotating when the core drill 4 is attached to or detached from the drill connecting portion 22 while rotating.

[0035] The support protrusion 26 is not limited to a hexagonal shape, and may be appropriately selected from shapes that are easy to grip when attaching the core drill 4 and that can support the bearing member 3.

[0036] The retaining ring groove 27 is a groove for attaching a retaining ring for supporting the rear end side of the attached bearing member 3, and is formed as a recessed groove on the outer circumferential surface of the nozzle body 21 rearward of the position where the connecting hole 25 opens. In this embodiment, a commercially available C-type retaining ring 28 is fitted into the retaining ring groove 27, as shown in Fig. 6 .

[0037] The retaining ring to be installed in the retaining ring groove 27 is not limited to the C-type retaining ring 28, but may be selected from various shapes such as an R-type retaining ring, an S-type retaining ring, or a bevel-type retaining ring.

[0038] Next, we will explain the bearing member 3. The bearing member 3 is a member that rotatably supports the dust collector suction nozzle 2 and enables the cutting waste g discharged from the dust collector suction nozzle 2 to be collected by the dust collector 6.

[0039] As shown in Figures 1 and 2, the bearing member 3 in this embodiment has a cylindrical bearing body 31, a dust collection hole 32 formed in the bearing body 31, and a bearing 33 that enables smooth rotation of the dust collector suction nozzle 2.

[0040] The bearing body 31 is formed in a cylindrical shape, and in this embodiment is made of stainless steel, similar to the nozzle body 21. The inner diameter of the bearing body 31 is formed to be slightly larger than the outer diameter of the nozzle body 21.

[0041] The dust collection holes 32 are holes that communicate with the communication holes 25 of the rotating dust collector suction nozzle 2 and allow cutting waste g to pass to the connected dust collector 6. As shown in FIG. 1, the dust collection holes 32 in this embodiment are formed to a size that allows the entirety of each rotating communication hole 25 to be seen when viewed from the opening side of the dust collection holes 32 (a size that is approximately the diameter from the front edge of the communication hole 25 located at the front to the rear edge of the communication hole 25 located at the rear).

[0042] Furthermore, the dust collection hole 32 in this embodiment has a female thread on its inner circumferential surface, and is configured so that a joint 61 for connecting to a dust collector 6 can be attached. The dust collector 6 connected to the dust collection hole 32 is a machine with a suction function, and a commercially available vacuum cleaner or the like can be used.

[0043] The bearings 33 are used to smoothly rotate the dust collector suction nozzle 2 and are made of ball bearings or the like. In this embodiment, the bearings 33 are installed at the front and rear ends of the bearing body 31, as shown in FIG.

[0044] The bearing member 3 is fitted from the rear end side of the dust collector suction nozzle 2 until it abuts against the support protrusion 26, and a C-shaped retaining ring 28 is fitted into the retaining ring groove 27 of the dust collector suction nozzle 2. At this time, a gap is formed between the inner peripheral surface of the bearing member 3 and the outer peripheral surface of the dust collector suction nozzle 2 that is large enough to allow relatively small cutting chips g to pass through.

[0045] Next, the operation of each component of the rotary tool dust collector 1 of this embodiment will be described.

[0046] 6, the core drill 4 is connected to the drill connecting portion 22 of the dust collector suction nozzle 2. In this embodiment, the support protrusion 26 has a substantially hexagonal cross section, which makes it easy to grip with a wrench or the like, and prevents the dust collector suction nozzle 2 from rotating when the core drill 4 is screwed in.

[0047] Furthermore, a drill chuck 51 is screwed into the female thread of the rotary tool connecting portion 23, and a rotary tool 5 such as an impact driver is connected via the drill chuck 51.

[0048] Furthermore, the joint 61 is screwed into the dust collection hole 32 of the bearing member 3, and the hose of the dust collector 6 is connected to the joint 61 for connection.

[0049] When drilling a hole in a wall W or the like, the rotary tool 5 is operated, and the tip of the rotating core drill 4 is pressed against the wall W. The core drill 4 cuts away the wall W with the cutting edge 42 at the tip to drill a hole.

[0050] The dust collector 6 uses suction to collect the cuttings g cut off by the core drill 4. At this time, the air sucked in by the dust collector 6 flows from around the drilled hole, past the tip of the core drill 4, into the inside of the drill, as shown in Figure 6, and is sucked into the dust collector 6 through the suction passage 24 of the dust collector suction nozzle 2, the various communication holes 25, and the dust collection hole 32 in the bearing member 3. The cuttings g generated during cutting are collected by the dust collector 6 along this air flow.

[0051] At this time, since there is a gap between the inner surface of the bearing member 3 and the outer surface of the dust collector suction nozzle 2, relatively small cutting chips g are always collected from each communicating hole 25, and relatively large cutting chips g are discharged from the communicating hole 25 and collected when the rotating communicating hole 25 and the dust collection hole 32 overlap.

[0052] In this embodiment, the drill body 21 has a plurality of communication holes 25, and the total opening area of ​​these communication holes 25 is large. Therefore, when the dust collector 6 sucks air, there is little pressure loss and a high suction force is obtained.

[0053] Therefore, even when drilling through multiple layers of different building materials, such as the exterior walls of a building, and the size of the generated cuttings g or the gap between the core drill 4 and the hole during drilling is not fixed, high suction performance and stable dust collection ability can be demonstrated.In addition, when collecting samples for asbestos testing, the scattering of cuttings g into the surrounding area can be prevented, allowing for safe collection work.

[0054] In addition, cutting waste g in the gap between the core drill 4 and the hole being drilled is quickly removed, which suppresses the generation of frictional heat. Also, the amount of air passing through the gap between the core drill 4 and the hole increases, improving the ability to cool the tip of the core drill 4, which is heated by frictional heat.

[0055] Therefore, it is possible to prevent carbonization of abrasive grains such as diamond powder adhered to the surface of the core drill 4, and it is possible to maintain high drilling performance.

[0056] Furthermore, in this embodiment, the communication holes 25 are arranged at offset positions in the axial direction, so there is a wide gap between adjacent communication holes 25. Therefore, even if a strong torque is applied to the dust collector suction nozzle 2 when drilling a hard object such as concrete, the nozzle will not break or bend, and work can be carried out safely.

[0057] According to the rotary tool dust collector 1 and the dust collector suction nozzle 2 of the present embodiment described above, the following effects can be achieved. 1. By arranging the multiple communication holes 25 while shifting their positions in the axial direction, the overall opening area is increased, improving suction force, and the distance D2 between the holes is widened, maintaining high strength. 2. By improving suction power, cutting waste g can be quickly removed, suppressing the generation of frictional heat during drilling, and the amount of air passing through can be increased to improve the cooling effect, suppressing carbonization of diamond powder and maintaining cutting ability. 3. By drilling through multiple layers of different building materials, such as the exterior walls of a building, high suction performance and stable dust collection ability can be achieved even if the size of the cutting waste g and the gap between the core drill 4 and the hole during drilling are not constant. 4. When collecting samples for asbestos testing, cutting waste (g) can be prevented from scattering around, allowing for safe collection work.

[0058] The rotary tool dust collector and the suction nozzle for the dust collector according to the present invention are not limited to the above-described embodiments and can be modified as appropriate. For example, in order to reliably prevent scattering of cuttings g when collecting samples for asbestos testing, a scattering prevention cover 7 that can be extended and contracted in the axial direction may be installed around the core drill 4, as shown in Figure 7. [Explanation of symbols]

[0059] 1. Rotary tool dust collector 2. Suction nozzle for dust collector 3 Bearing materials 4 Core drill 5 Rotary tools 6 Dust collector 7. Anti-scattering cover W wall g Cutting waste 21 Nozzle body 22 Drill connection part 23 Rotary tool connection part 24 Suction passage 25 Communication hole 26 Support protrusion 27 Retaining ring groove 28 C-type retaining ring 31 Bearing body 32 Dust collection hole 33 Bearing 41 Proximal end 42 blades 51 Drill chuck 61 Joint

Claims

1. A suction nozzle for a dust collector used in a rotary tool dust collector that is attached to a rotary tool equipped with a core drill for drilling a wall and collects cutting chips, The dust collector includes a nozzle body rotatably supported on a bearing member of the rotary tool dust collector, a drill connecting portion for connecting the core drill to a front end of the nozzle body, and a rotary tool connecting portion for connecting a rotary tool to a rear end of the nozzle body, the nozzle body is formed with a first suction passage that penetrates the interior of the nozzle body along an axis from the tip surface on the drill connecting portion side; six second suction passages that are smaller in diameter than the first suction passage and open around the first suction passage; and six communication holes that communicate with the first suction passage from the outer circumferential surface of the nozzle body, the communication holes being aligned circumferentially of the nozzle body and arranged with their opening positions shifted alternately front to back in the axial direction.

2. A suction nozzle for a dust collector according to claim 1 and a bearing member that rotatably supports the suction nozzle for a dust collector, The bearing member is connectable to a dust collector having a suction function and has dust collection holes communicating with the respective communication holes of the rotating suction nozzle for the dust collector.

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