Dust collection accessory

Abstract

Provided is a dust collection attachment in which dust does not easily accumulate in a dust collection part. A dust collection attachment (1) is provided with: a dust collection unit (2) which faces the surface of a workpiece (W) and through which a tip tool (T) can pass; and a main body section (3) that has a dust collection passage (36) that communicates with the dust collection section (2) and can be connected to an external hose, and in the dust collection attachment, the dust collection section (2) is brought into negative pressure by applying a suction force from the hose to the dust collection passage (36). The dust collection unit (2) is provided with: an inner cylinder (5) through which the tip tool (T) passes; a front-side dust collection flow path (20) that communicates with the dust collection path (36) and has a front suction port (22) opened at the front on the outside in the radial direction of the inner cylinder (5); and a rear-side dust collection flow path (21) that communicates with the dust collection path (36) and that opens a rear suction port (23) on the outside in the radial direction of the inner cylinder (5) and behind the inner cylinder (5).

Description

Technical Field

[0001] The present disclosure relates to a dust collecting attachment for collecting dust generated from a workpiece when an electric tool is working. Background Art

[0002] When, for example, a hammer drill is used to perform a drilling operation with an end tool, a dust collecting attachment is sometimes used to collect dust in a manner that does not cause dust generated from the workpiece at the processing position to fly. Patent document 1 (U.S. Patent Application Publication No. 2011 / 0142561) discloses an example of this. The dust collecting attachment disclosed in the document is provided with a cylindrical dust suction portion for the end tool to pass through the upper part of a shell that expands to the left and right, and on the one hand, a cylindrical handle portion having a dust collection passage connected to the dust suction portion is formed on the outer side of the shell. On the other hand, a seal and a pad are provided on the back side of the shell to form a suction space for the suction port to open.

[0003] The dust collection attachment is used by connecting an external dust collector via a hose at the handle. When the dust collector is operated and the suction port is in contact with the surface of the workpiece, the handle and the dust suction part connected to the hose become negative pressure, and the suction space connected to the handle also becomes negative pressure. Therefore, the suction port remains fixed by being sucked onto the workpiece. When the end tool of the power tool is inserted into the dust suction part for processing, the generated dust is directly sucked from the dust suction part and collected in the dust collector via the handle and the hose.

[0004] Patent Document 1: U.S. Patent Application Publication No. 2011 / 0142561

[0005] Since the conventional dust collecting attachment is provided with a dust collecting part on the upper part of the housing, when the dust collecting part and the housing are used in a posture where they are arranged vertically, the dust sucked by the dust collecting part directly flows downward and is smoothly sucked into the dust collecting passage.

[0006] However, if the dust collector and the housing are used in a horizontal position with the dust collector and the housing arranged side by side, dust may not be sucked into the dust collecting passage and may remain on the inner surface of the dust collector, which is at the bottom. In particular, the opening on the front side (operator side) of the dust collector is often equipped with a rubber cap for the end tool to pass through in order to improve the sealing performance. Therefore, a space where air cannot easily flow is generated between the inner surface of the dust collector and the rubber cap, which makes it easy for dust to accumulate in this space during the horizontal position operation. Summary of the invention

[0007] Therefore, an object of the present disclosure is to provide a dust collecting attachment in which dust is not easily accumulated in a dust suction part.

[0008] In order to achieve the above-mentioned purpose, the present invention discloses a dust collecting accessory, comprising: a dust suction part, which faces the surface of the workpiece and can be penetrated by an end tool; and a main body, which has a dust collecting passage that is connected to the dust suction part and can be connected to an external hose. In the dust collecting accessory, the dust suction part is made to have negative pressure by applying suction force from the hose to the dust collecting passage.

[0009] Moreover, it is characterized in that the dust suction part comprises: an inner cylinder, which is passed through by the end tool; a first dust suction flow path, which is provided with a first suction port on the radially outer side of the inner cylinder and on the side of the workpiece and is connected to the dust collecting passage; and a second dust suction flow path, which is provided with a second suction port on the radially outer side of the inner cylinder and on the side opposite to the workpiece and is connected to the dust collecting passage.

[0010] According to the present disclosure, the flow paths in the dust suction section are dispersed, and no space where air is difficult to flow is generated on both sides of the workpiece side and the opposite side in the dust suction section. Therefore, dust is not easily accumulated in the dust suction section. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a perspective view of the dust collection attachment as seen from the rear.

[0012] Figure 2 This is a perspective view of the dust collection attachment as seen from the front.

[0013] Figure 3 is the rear view of the dust collection accessory.

[0014] Figure 4 This is the front view of the dust collection accessory.

[0015] Figure 5 This is a perspective view of the dust suction unit with the rubber cap removed, viewed from the front.

[0016] Figure 6 This is a three-dimensional view of the dust suction unit with the rubber cap removed, viewed from the rear.

[0017] Figure 7 This is a front view of the dust suction unit with the rubber cap removed.

[0018] Figure 8 This is a rear view of the dust collection unit with the rubber cap removed.

[0019] Fig. 9 yes Figure 3 Enlarged cross-sectional view of line AA.

[0020] Fig.10 yes Figure 3 Enlarged cross-sectional view of line BB.

[0021] Fig.11 yes Figure 4 An enlarged cross-sectional view of the CC line portion.

[0022] Fig.12 is a rear view of the dust collection attachment with a small diameter ferrule attached.

[0023] Fig.13 It is a rear view of the dust collection attachment with the large diameter ferrule attached.

[0024] Fig.14 yes Fig.12 An enlarged cross-sectional view of the DD line portion.

[0025] Fig.15 yes Fig.13 An enlarged cross-sectional view of the EE line portion.

[0026] Fig.16 Yes means Figure 3 An explanatory diagram of the flow of air in a use state in an enlarged cross section of the AA line portion.

[0027] Fig.17 It is used in a horizontal position. Fig.16 An enlarged cross-sectional view of the FF line portion.

[0028] Description of Reference Numerals

[0029] 1...dust collection attachment; 2...dust suction part; 3...main body; 5...inner tube; 6...outer tube; 8...rubber cap; 13...rib; 14...ventilation space; 20...front dust suction flow path; 21...rear dust suction flow path; 22...front suction port; 23...rear suction port; 30...main body shell; 31...pad; 32...inner frame; 33...exhaust handle; 36...dust collection passage; 36a...suction port; 37...handle; 40...suction space; 42...connecting port; 48...adsorption port; 49...abutment portion; 50...exhaust hole; 52...closing portion; 53, 53A...finger overlap; 60...joint; 70; 71...hoop; W...workpiece. DETAILED DESCRIPTION

[0030] In one embodiment of the present disclosure, the first dust suction flow path and the second dust suction flow path may merge into the dust collecting passage.

[0031] According to this configuration, even if two dust suction flow paths are provided in the dust suction unit, dust can be efficiently guided to the dust collection passage.

[0032] In one embodiment of the present disclosure, the first dust suction flow path and the second dust suction flow path may be provided in a region of the dust suction unit at least on the dust collecting passage side.

[0033] According to this configuration, the two dust suction flow paths can be brought close to the dust collecting passage to shorten the flow paths, and the pressure loss can be suppressed to prevent a decrease in the dust collecting efficiency.

[0034] In one embodiment of the present disclosure, the first suction port may be formed larger than the second suction port in the circumferential direction of the inner tube.

[0035] According to this structure, dust generated from the workpiece can be efficiently collected.

[0036] In one embodiment of the present disclosure, the first suction port and the second suction port may be formed at an angle of 180° or more in the circumferential direction.

[0037] According to this configuration, even when the dust collecting attachment is used with the dust collecting passage oriented in the horizontal direction, dust can be sucked with both suction ports positioned below the end tool, thereby effectively preventing dust from being accumulated in the dust collecting section.

[0038] In one embodiment of the present disclosure, the second suction port may be formed between the inner tube and an outer tube provided on the outside, and a rib may be provided between the inner tube and the outer tube.

[0039] According to this structure, the second suction port can be reinforced between the inner tube and the outer tube to maintain the shape.

[0040] In one embodiment of the present disclosure, a cap for sealing a space between the end tool and the dust suction portion that penetrates therethrough may be detachably provided on the side of the dust suction portion opposite to the workpiece.

[0041] According to this configuration, the second dust suction flow path can be formed by the cap.

[0042] Alternatively, in one embodiment of the present disclosure, the second suction port includes: an opposite side opening portion opening to the side opposite to the workpiece; and an inner side opening portion connected to the opposite side opening portion and opening toward the inner circumferential surface of the inner tube, and the cap closes the opposite side opening portion when installed.

[0043] According to this configuration, dust that tends to accumulate inside the cap can be efficiently sucked in from the inner opening.

[0044] Example

[0045] Hereinafter, embodiments of the present disclosure will be described based on the drawings.

[0046] Figure 1 This is a perspective view showing an example of a dust collection attachment as seen from the rear. Figure 2 This is a stereogram viewed from the front. Figure 3 is the rear view, Figure 4 It is the main view.

[0047] The dust collecting attachment 1 includes a dust collecting unit 2, a main body 3, and a flexible hose 4. For convenience, the dust collecting unit 2 is described as the top and the dust collecting unit 2 and the main body 3 are described as the front.

[0048] The dust collecting part 2 is cylindrical with its axis extending in the front-rear direction. The dust collecting part 2 is a double-layered tube having an inner tube 5 and an outer tube 6. The front end of the inner tube 5 is located at a rearward position than the front end of the outer tube 6, and the inner tube 5 is shorter in the axial direction than the outer tube 6.

[0049] like Figure 5 and Figure 6 As shown, a small-diameter cover portion 7 is coaxially formed at the rear end of the outer cylinder 6. A rubber cap 8 is detachably covered on the cover portion 7. The rubber cap 8 is formed with a through hole 9 located in the center and a plurality of notches 10, 10, ... extending in radial directions from the through hole 9. The rubber cap 8 is an example of a cap disclosed in the present invention.

[0050] An upper connection portion 11 is provided directly above the dust collecting portion 2 on the axis and between the inner cylinder 5 and the outer cylinder 6. The upper connection portion 11 is a V-shaped rib in a front view and extends in the front-rear direction to connect the inner cylinder 5 and the outer cylinder 6.

[0051] A rear connecting portion 12 is provided at the rear of the upper connecting portion 11 and between the inner tube 5 and the outer tube 6, which connects the upper portions of the two tubes to each other at the rear ends thereof and is in the shape of an arc when viewed from behind. The rear end of the inner tube 5 excluding the rear connecting portion 12 is located at a position further forward than the rear end of the outer tube 6. A pair of ribs 13, 13 connecting the two tubes 5, 6 are formed symmetrically between the rear ends of the inner tube 5 and the rear ends of the outer tube 6 excluding the rear connecting portion 12. The inner surface of each rib 13 is a concave curved surface that is continuous with the inner circumferential surface of the inner tube 5 and extends rearward. The rear surface of each rib 13 is a plane that is continuous with the rear end surface of the outer tube 6 and extends radially inward. The rear surface of each rib 13 abuts against the front surface of the assembled rubber cap 8.

[0052] Therefore, if Figure 7 and Figure 8 As shown, the inner tube 5 and the outer tube 6 are coaxially connected to each other, and between the two tubes, except for the upper connecting portion 11, an annular ventilation space 14 that is continuous in the circumferential direction is formed.

[0053] A notch 15 is partially formed on the front side of the lower portion of the outer tube 6. The upper end of a partition plate 16 that partitions a dust collection passage 36 described later is located in the notch 15.

[0054] A front dust suction passage 20 and a rear dust suction passage 21 are formed on the radially outer side of the inner cylinder 5. The front dust suction passage 20 is an example of a first dust suction passage of the present disclosure, and the rear dust suction passage 21 is an example of a second dust suction passage of the present disclosure.

[0055] The front dust suction flow path 20 has a front suction port 22 opened at the front. The front suction port 22 is an example of a first suction port of the present disclosure.

[0056] like Figure 5 and Figure 7 As shown, the front suction port 22 is formed as an annular opening between the front end of the inner tube 5, the front end of the outer tube 6, and the upper end of the partition plate 16, excluding the upper connecting portion 11. That is, the front suction port 22 is formed as an annular opening from the area on the lower half side of the dust suction part 2 to the area on the upper half side. The area on the lower half side of the dust suction part 2 is an example of an area on the dust collection passage side in the dust suction part of the present disclosure.

[0057] The front dust suction flow path 20 is a flow path that extends from the front suction port 22 through the ventilation space 14 to reach an air suction port 36 a of a dust collection passage 36 to be described later.

[0058] The rear dust suction passage 21 is provided with a rear suction port 23 at the rear. The rear suction port 23 is an example of the second suction port of the present disclosure. Figure 6 and Figure 8 As shown, the rear suction port 23 has a rear opening 24 opened in an arc shape between the rear ends of the inner tube 5 and the outer tube 6 except the rear connecting portion 12 when viewed from behind. The rear opening 24 is an example of the opposite side opening of the present disclosure.

[0059] The rear suction port 23 further includes an inner opening portion 25 which is open in a band shape in the circumferential direction across the ribs 13, 13, at the rear and radially inner side of the inner tube 5. The rear opening portion 24 and the inner opening portion 25 are communicated with each other.

[0060] The rear suction port 23 including the rear opening 24 and the inner opening 25 is formed to include the lower half of the dust collecting unit 2 and to be opened at an angle greater than 180° along the circumferential direction of the inner cylinder 5. The rear suction port 23 is smaller than the front suction port 22 in the circumferential direction of the inner cylinder 5.

[0061] When the rubber cap 8 is mounted, the rear opening 24 of the rear suction port 23 is blocked by the outer peripheral portion of the rubber cap 8. Therefore, only the inner opening 25 of the rear suction port 23 opens into the inner tube 5.

[0062] The rear dust suction flow path 21 is a flow path that extends from the rear suction port 23 through the ventilation space 14 to the suction port 36 a of the dust collection passage 36 .

[0063] The main body 3 includes a main body case 30 , a cushion portion 31 , an inner frame 32 , and an exhaust handle 33 .

[0064] The main body case 30 is circular in rear view. A connecting portion 34 connected to the dust collecting portion 2 is provided vertically on the upper portion of the main body case 30. A belt-shaped skirt 35 is formed on the outer periphery of the main body case 30 and protrudes forward along the entire periphery, and is open at the front.

[0065] Also like Fig. 9 and Fig.10 As shown, a cylindrical dust collecting passage 36 is formed in the main body shell 30 along the up and down direction. The dust collecting passage 36 penetrates the connecting part 34 at the center of the left and right direction of the main body shell 30, and an air inlet 36a is provided at the upper end on the lower inner surface of the outer cylinder 6 of the dust collecting part 2. The air inlet 36a is connected to the ventilation space 14. The lower part of the dust collecting passage 36 becomes a handle part 37 that bulges backward from the upper part to the lower part of the main body shell 30 and opens at the lower end at the back of the main body shell 30. A concave part 38 with a semicircular cross section that extends continuously from the handle part 37 to the lower side is formed on the back of the main body shell 30. The partition plate 16 is screwed to the main body shell 30 at a position extending upward from the concave part 38 at the front side of the handle part 37 to form the front wall of the dust collecting passage 36.

[0066] An inner rib 39 of the same shape as the skirt 35 is formed on the front surface of the main body housing 30. A suction space 40 is formed inside the inner rib 39. A plurality of connecting ribs 41, 41, ... protruding radially from the inner rib 39 are provided between the skirt 35 and the inner rib 39. A communication port 42 communicating with the suction space 40 is formed at the front of the upper end of the handle portion 37 and between the partition plate 16 and the recess 38.

[0067] The pad 31 is formed of an elastic material, and its outer shape in front view is similar to that of the main body shell 30 and slightly larger. An opening 43 is formed in the center of the pad 31 along the inner rib 39 and in the same shape as the inner rib 39. The pad 31 is arranged to cover between the skirt 35 and the inner rib 39 at the front surface of the main body shell 30. The pad 31 is formed into a shallow cone shape with the front surface receding as it moves from the outer periphery to the opening 43 side. A thin-walled portion 44 is formed on the inner peripheral edge of the opening 43, which is recessed rearward over the entire circumference.

[0068] The inner frame 32 is annularly circumferentially arranged along the thin-walled portion 44 of the cushion portion 31. The thin-walled portion 44 is fitted into the inner frame 32 from the rear. A pair of left and right threaded fixing portions 45, 45 are formed on the inner circumference of the inner frame 32 and are respectively formed in the upper and lower parts. The threaded fixing portions 45, 45 are respectively fixed to the left and right pairs of screw bosses 46, 46 respectively provided in the upper and lower parts on the front surface of the main body housing 30 by screws 47, 47. Thus, the cushion portion 31 is fixed, and a suction port 48 communicating with the central suction space 40 is formed on the front surfaces of the cushion portion 31 and the inner frame 32.

[0069] like Figure 2 and Figure 4 As shown, the upper ends of the pad portion 31 and the inner frame 32 are chamfered to form a straight line in the left-right direction.

[0070] Four abutment portions 49, 49, ... protruding forward are formed on the front surface of the inner frame 32 and in the upper, lower, left and right directions. The upper abutment portion 49 extends in the left-right direction in accordance with the shape of the upper end of the inner frame 32. The other three abutment portions 49, 49, ... on the lower side and the left and right sides extend in an arc shape along the circumferential direction of the inner frame 32.

[0071] like Fig. 9 and Fig.10 As shown, each contact portion 49 is formed with a protruding height that is slightly behind the front end surface of the pad 31 before being adsorbed to the workpiece. In this state, the tapered portion of the pad 31 is not in contact with the skirt 35 of the main body case 30.

[0072] The main body housing 30 is formed with exhaust holes 50, 50 facing the suction space 40. Figure 2 and Figure 4 As shown, each exhaust hole 50 is a rectangular shape extending in the vertical direction, and is arranged in the vertical direction between the upper left and right screw bosses 46, 46 and on the right side.

[0073] The exhaust holes 50, 50 are located on the right side of the handle portion 37 on the back side. A notch portion 51 is formed on the right side of the handle portion 37, extending from the side to the back side. The notch portion 51 extends in the up-down direction in a quadrilateral region including the exhaust holes 50, 50. The exhaust holes 50, 50 penetrate the main body case 30 and communicate with the notch portion 51.

[0074] The exhaust handle 33 is a quadrilateral block that fits into the notch 51 and spans from the side to the back of the handle 37. The exhaust handle 33 can move forward and backward in the notch 51. A pair of upper and lower plug parts 52, 52 are protruding from the front surface of the exhaust handle 33. Fig.11 As shown, at the advanced position where the exhaust handle 33 abuts against the bottom surface of the notch portion 51 , the plug portions 52 , 52 are fitted into the exhaust holes 50 , 50 to close the exhaust holes 50 , 50 .

[0075] The exhaust handle 33 is fitted into the notch 51 at the forward position and is received in the outer shape of the handle portion 37. A finger strap 53 is integrally formed between the side and back of the exhaust handle 33 in the up-down direction, and is inclined and protrudes toward the right outside and toward the rear. A similar finger strap 53A is formed on the left side of the handle portion 37 at a symmetrical position symmetrical to the finger strap 53 of the exhaust handle 33, with the plane passing through the center line L of the handle portion 37 in the up-down and front-back directions as the center.

[0076] The exhaust handle 33 is provided with a guide pin 54 protruding forward. The guide pin 54 is fixed to the exhaust handle 33 by insert molding at the rear portion between the plug-closing parts 52, 52. A guide cylinder 55 protruding forward is formed between the upper and lower exhaust holes 50, 50 of the main body housing 30. The guide pin 54 penetrates the guide cylinder 55 from the rear. A washer 56 is installed in front of the guide cylinder 55 and at the front end of the guide pin 54 to prevent it from coming off by a circlip.

[0077] A coil spring 57 is mounted on the front of the guide cylinder 55 and on the front of the guide pin 54. The coil spring 57 is sandwiched between the washer 56 and a receiving recess 58 formed on the inner periphery of the guide cylinder 55. Therefore, the exhaust handle 33 is normally located in the advanced position where the plug parts 52, 52 close the exhaust holes 50, 50 because the guide pin 54 is urged forward by the coil spring 57.

[0078] The upper end of the flexible hose 4 is connected to the handle portion 37 of the main body case 30. The flexible hose 4 is fitted into the recessed portion 38 of the main body case 30 and extends downward. A cylindrical joint 60 is attached to the lower end of the flexible hose 4.

[0079] The joint 60 has three diameters: a large diameter portion 61 with the largest diameter at the top, a medium diameter portion 62 in the middle, and a small diameter portion 63 with the smallest diameter at the bottom. Grooves are formed in the circumferential direction on the outer periphery of the medium diameter portion 62 by thinning. Multiple annular outer ribs 64, 64, ... are formed in the axial direction on the outer periphery of the small diameter portion 63.

[0080] therefore, Fig.12 The small diameter ferrule 70 shown and Fig.13 The large diameter ferrules 71 shown are all capable of being connected to the connector 60 .

[0081] like Fig.14 As shown, the small-diameter ferrule 70 can be connected by attaching the end thereof to the small-diameter portion 63. A plurality of annular inner ribs 72, 72, ... are formed along the axial direction on the inner peripheral surface of the ferrule 70. In the connected state to the small-diameter portion 63, the inner ribs 72 are engaged between the outer ribs 64, 64 to produce a disengagement prevention effect.

[0082] like Fig.15 As shown, the large-diameter ferrule 71 can be connected by attaching the end thereof to the front of the large-diameter portion 61 and pressing it into the medium-diameter portion 62 .

[0083] Therefore, regardless of whether the end of the external hose 73 is the ferrule 70 or the ferrule 71 , the operator can handle it with one connector 60 , and there is no need to use the connector 60 in a differentiated manner to match the ferrules 70 and 71 .

[0084] When using the dust collecting attachment 1 constructed as described above, the operator holds the handle 37 of the main body 3, positions the main body 3 on the surface of the workpiece in the vertical direction so that the dust collecting part 2 matches the processing position, and makes the suction port 48 close to the workpiece. If the dust collector is operated in this state, suction force is generated in the flexible hose 4 and the dust collecting passage 36 through the hose 73, and suction force is also generated at the suction port 36a of the dust collecting part 2.

[0085] The suction space 40 of the main body 3 is connected to the dust collecting passage 36 via the communication port 42, so the air in the suction space 40 is sucked into the dust collecting passage 36 via the communication port 42, so that the suction space 40 has a negative pressure. Fig.16 As shown, the suction port 48 is sucked onto the surface of the workpiece W, and the dust collecting attachment 1 is fixed to the surface of the workpiece W as it is.

[0086] At this time, the abutting portions 49 of the inner frame 32 limit the further advancement of the main body housing 30 by abutting the surface of the workpiece W with the front surface. Therefore, the pad portion 31 is not crushed between (the surface of the workpiece W) and the skirt portion 35 of the main body housing 30, and the non-contact state between the pad portion 31 and the skirt portion 35 is maintained.

[0087] If the pad 31 is in contact with the skirt 35, if there is a convex shape on the surface of the workpiece W, the skirt 35 may ride on the convex portion together with the pad 31, causing the gap between the pad 31 and the surface of the workpiece W to expand, thereby reducing the adsorption force.

[0088] However, in this example, the front position of the main body case 30 is limited by the abutment portion 49 to maintain the non-contact state between the pad portion 31 and the skirt portion 35. Therefore, even if there is a convex shape on the surface of the workpiece W, only the pad portion 31 is deformed, preventing the main body case 30 from floating without reducing the adsorption force.

[0089] In particular, in a state where the suction port 48 is not suctioned to the workpiece W, the front surface of the contact portion 49 is located closer to the main body case 30 than the front end surface of the pad portion 31 .

[0090] Therefore, even if the contact portion 49 is provided, close contact with the surface of the workpiece W by the pad portion 31 is not hindered.

[0091] Then, the operator makes the end tool T of the electric tool (not shown) penetrate from the rear of the dust suction part 2 to perform the drilling operation. Fig.16As shown by the dotted arrow a, the air outside the dust collection unit 2 is sucked into the inner cylinder 5 from between the rubber cap 8 and the end tool T. A portion of the air sucked into the inner cylinder 5 moves forward in the inner cylinder 5 and enters the front dust collection flow path 20 from the front suction port 22. Then, this portion of the air enters the dust collection passage 36 through the suction port 36a, and reaches the dust collector from the dust collection passage 36 through the flexible hose 4 and the hose 73.

[0092] On the other hand, another part of the air sucked into the inner cylinder 5 flows radially outward in the inner cylinder 5 as shown by the single-dot chain arrow b and enters the rear dust suction flow path 21 from the inner opening 25 of the rear suction port 23. Then, this other part of the air merges with a part of the air flowing in the front dust suction flow path 20 in the ventilation space 14 and enters the dust collection passage 36 from the suction port 36a, and reaches the dust collector from the dust collection passage 36 via the flexible hose 4 and the hose 73.

[0093] Therefore, the dust generated from the workpiece W is sucked in from either the front suction port 22 or the rear suction port 23 together with the air, enters the dust collecting passage 36 from the front dust suction flow path 20 or the rear dust suction flow path 21, and is collected in the dust collector via the flexible hose 4 and the hose 73.

[0094] In this example, an inner opening 25 of the rear suction port 23 is provided on the inner side of the outer peripheral portion of the rubber cap 8 over a range of more than 180 degrees. Therefore, the dust in the inner cylinder 5 does not stay between the inner cylinder 5 and the rubber cap 8, but is sucked from the rear suction port 23. Fig.17 As shown, even when the dust collecting attachment 1 is in a horizontal position, the inner opening 25 is located in the lower area of ​​the inner cylinder 5 inside the rubber cap 8. Therefore, the dust is sucked into the dust collecting passage 36 through the rear dust suction flow path 21 from the inner opening 25. Therefore, dust is not easily accumulated on the inner peripheral surface of the inner cylinder 5 inside the outer peripheral portion of the rubber cap 8.

[0095] When the dust collecting attachment 1 is removed from the workpiece W in order to change the processing position, for example, the operator places his fingers on the finger-engaging piece 53 and the left finger-engaging piece 53A of the exhaust handle 33 of the handle portion 37 from the front side and pulls them directly backward. Fig.10As shown by the double-dotted line, the exhaust handle 33 overcomes the force of the coil spring 57 and retreats, opening the notch portion 51 so that the exhaust holes 50, 50 are opened respectively. Therefore, the outside air flows into the suction space 40 from each exhaust hole 50 to reduce the adsorption force, so that the dust collecting attachment 1 can be directly removed from the workpiece W to the rear. The removal action can be performed continuously with the operation of pulling the exhaust handle 33 backward via the finger straps 53, 53A. That is, the exhaust formed by the exhaust handle 33 and the removal of the dust collecting attachment 1 are not separate independent operations. Therefore, the dust collecting attachment 1 can be removed by simple operation, and it can also effectively prevent accidental falling during removal.

[0096] When the dust collecting attachment 1 is removed and the exhaust handle 33 is released from being pulled, the exhaust handle 33 moves to the advanced position due to the biasing force of the coil spring 57. Therefore, the exhaust holes 50, 50 are closed again by the closing plugs 52, 52.

[0097] The dust collecting accessory 1 of the above-mentioned embodiment includes: a dust suction part 2, which is opposite to the surface of the workpiece W and can be penetrated by the end tool T; and a main body 3, which has a dust collecting passage 36 that is connected to the dust suction part 2 and can be connected to an external hose. In the dust collecting accessory 1, a suction force is applied from the hose 73 to the dust collecting passage 36, so that the dust suction part 2 becomes negative pressure.

[0098] Moreover, the dust suction part 2 comprises: an inner cylinder 5 for the end tool T to pass through, a front dust suction flow path 20 having a front suction port 22 opened on the radial outer side of the inner cylinder 5 and forward and connected to the dust collecting passage 36, and a rear dust suction flow path 21 having a rear suction port 23 opened on the radial outer side of the inner cylinder 5 toward the rear and connected to the dust collecting passage 36.

[0099] According to this structure, the flow path in the dust suction part 2 is dispersed, and no space where air is difficult to flow is generated on both sides of the front and back of the dust suction part 2. Therefore, dust is difficult to accumulate in the dust suction part 2.

[0100] The front dust suction flow path 20 and the rear dust suction flow path 21 merge into the dust collecting passage 36 .

[0101] Therefore, even if two dust suction passages 20 and 21 are provided in the dust suction unit 2, dust can be efficiently guided to the dust collection passage 36.

[0102] The front dust suction passage 20 and the rear dust suction passage 21 are provided in at least a lower half area of ​​the dust suction unit 2 .

[0103] Therefore, the dust suction flow paths 20 and 21 can be brought close to the dust collecting passage 36 to shorten the flow paths, thereby suppressing pressure loss and preventing a decrease in dust collecting efficiency.

[0104] The front suction port 22 is formed larger than the rear suction port 23 in the circumferential direction of the inner tube 5 .

[0105] Therefore, dust generated from the workpiece W is efficiently sucked.

[0106] The front suction port 22 and the rear suction port 23 are both formed at an angle of 180° or more in the circumferential direction.

[0107] Therefore, even when the dust collecting attachment 1 is used with the dust collecting passage 36 in the horizontal direction, dust can be sucked with the two suction ports 22 and 23 located below the end tool T, thereby effectively preventing dust from being accumulated in the dust collecting unit 2 .

[0108] The rear suction port 23 is formed between the inner tube 5 and the outer tube 6 provided on the outside thereof, and ribs 13 , 13 are provided between the inner tube 5 and the outer tube 6 .

[0109] Therefore, the rear suction port 23 can be reinforced between the inner tube 5 and the outer tube 6 to maintain its shape. In addition, the rib 13 can suppress excessive deformation of the rubber cap 8 in the forward direction.

[0110] A rubber cap 8 for sealing between the penetrating end tool T and the dust suction part 2 is detachably provided on the rear side of the dust suction part 2 .

[0111] Therefore, the rear dust suction flow path 21 can be formed by the rubber cap 8 .

[0112] The rear suction port 23 includes a rear opening portion 24 opening to the rear side and an inner opening portion 25 communicating with the rear opening portion 24 and opening toward the inner circumferential surface of the inner tube 5 . The rubber cap 8 closes the rear opening portion 24 when mounted.

[0113] Therefore, dust that tends to accumulate inside the rubber cap 8 can be efficiently sucked from the inner opening 25 .

[0114] In the above-described embodiment, the following changes can be made.

[0115] The first suction port is not limited to the front suction port of the above example. The first suction port may be shorter in the circumferential direction than the above example, or may be opened over the entire circumference if possible.

[0116] The opening width of the first suction port in the radial direction may be larger or smaller than the above example, or the opening width may be changed circumferentially. The front end of the inner tube may be formed at the same front-rear position as the front end of the outer tube to form the first suction port.

[0117] The second suction port is not limited to the rear suction port of the above example. Alternatively, the second suction port may be formed so that the length of the dust collecting part in the circumferential direction is longer than that in the above example, or, if possible, the second suction port may be formed so that the length of the dust collecting part in the circumferential direction is longer than that in the above example. Alternatively, the second suction port may be formed so that the angle is shorter than 180° in the circumferential direction.

[0118] The second suction port may be formed continuously in the circumferential direction without any rib connecting the inner tube and the outer tube.

[0119] Alternatively, the first suction port and the second suction port may have the same length in the circumferential direction. Alternatively, in contrast to the above example, the second suction port may be longer than the first suction port.

[0120] The first and second dust suction flow paths are not limited to the front dust suction flow path and the rear dust suction flow path in the above example. Alternatively, the first and second dust suction flow paths do not form the ventilation space between the inner cylinder and the outer cylinder into a ring shape. Alternatively, the first and second dust suction flow paths do not converge in the dust suction part, but are independently connected to the dust collection passage.

[0121] The cap is not limited to the rubber cap in the above example, but may be made of other resins. The cap may also be omitted.

[0122] The blocking structure of the exhaust hole formed by the exhaust handle is not limited to the above example. For example, the exhaust handle may include two guide pins, one above the other, instead of one, and a plug is formed between the guide pins to block the exhaust hole provided in the main body shell. The exhaust handle is not limited to being guided by the guide pin, and a plate-shaped guide may be provided on the exhaust handle. The guide may also be formed integrally on the exhaust handle.

[0123] The shapes of the exhaust hole and the plug portion can also be changed appropriately. The exhaust hole and the plug portion may be square or circular instead of rectangular.

[0124] The shape of the exhaust operation part is not limited to the quadrilateral block-shaped exhaust handle in the above example. The exhaust operation part may also be in a semicircular block shape or a rod shape.

[0125] The finger landing part may not be formed with the same protrusion amount in the vertical direction as the finger landing piece in the above example. For example, the finger landing part may be formed into a semicircular shape when viewed from behind, and the protrusion amount in the center in the vertical direction may be larger.

[0126] The finger grip portion may not be a structure protruding from the exhaust operation portion like the finger grip piece in the above example. For example, the finger grip portion may be a recessed portion formed in the exhaust handle.

[0127] In the above example, the exhaust handle is provided on the right side, but it may be provided on the left side, or a pair of them may be provided on the left and right sides of the handle portion.

[0128] In the present disclosure, there may not be a structure for closing the exhaust hole by the exhaust handle.

[0129] The number and shape of the contact portion of the inner frame can be changed appropriately. For example, the contact portion may be extended long along the circumferential direction of the inner frame, or may be shortened on the contrary.

[0130] In the above example, the front surface of the contact portion is located slightly behind the front end surface of the pad portion, but the front surface of the contact portion may be located on the same plane (here, a plane defined by the up-down and left-right directions) as the front end surface of the pad portion.

[0131] In the present disclosure, the abutment portion may not be present.

[0132] The connector can be appropriately changed to match the shape of the ferrule of the hose on the dust collector side. It can also be, for example, that the number of stages with different diameters can be increased to connect correspondingly to more than three types of ferrules. The connection between the connector and the ferrule is not limited to the connection formed by the engagement or pressing of the ribs. For example, as a connection structure, screw connection or bayonet connection can also be adopted.

[0133] The connector may also be configured to correspond to only one ferrule.

[0134] In addition, the main body is not limited to a circular shape when viewed from behind, and can also be a polygon, square, rectangle, triangle, oval or other rear-view shape.

[0135] The shape of the suction port can also be changed appropriately.

[0136] The shapes and mounting structures of the cushion and the inner frame can also be appropriately changed in accordance with the main body. A sealing member other than the cushion may be used to form the suction port.

[0137] Also can omit flexible hose.In this case, the outside hose is directly connected to the lower end of the handle portion.

[0138] In the above example, the dust collecting attachment is sucked onto a workpiece in a vertical direction, but the dust collecting attachment of the present disclosure can be used even when the workpiece is inclined or in a horizontal direction.

Claims

1. A dust collection accessory, comprising: A dust suction part, which faces the surface of the workpiece and can be penetrated by the end tool; and a main body, which has a dust collection passage that is connected to the dust suction part and can be connected to an external hose. In the dust collection accessory, the dust suction part is made into a negative pressure by applying a suction force from the hose to the dust collection passage. The dust collection attachment is characterized in that The dust suction unit comprises: An inner cylinder, through which the end tool passes; a first dust suction passage, which has a first suction port formed on the radially outer side of the inner cylinder and on the workpiece side and is connected to the dust collection passage; and A second dust suction flow path is provided with a second suction port on the radially outer side of the inner cylinder and on the side opposite to the workpiece and is communicated with the dust collection passage.

2. The dust collection accessory according to claim 1, characterized in that: The first dust suction flow path and the second dust suction flow path merge into the dust collecting passage.

3. The dust collection accessory according to claim 1 or 2, characterized in that: The first dust suction flow path and the second dust suction flow path are provided in a region of the dust suction portion at least on the dust collecting passage side.

4. The dust collecting accessory according to any one of claims 1 to 3, characterized in that: The first suction port is formed larger than the second suction port in the circumferential direction of the inner tube.

5. The dust collection accessory according to claim 4, characterized in that: The first suction port and the second suction port are both formed at an angle of 180° or more in the circumferential direction.

6. The dust collection accessory according to claim 5, characterized in that: The second suction port is formed between the inner tube and an outer tube provided outside, and a rib is provided between the inner tube and the outer tube.

7. The dust collection accessory according to claim 6, characterized in that: An annular ventilation space is formed between the inner cylinder and the outer cylinder, and the first dust suction flow path is a flow path that passes through the ventilation space from the first suction port and reaches the dust collection passage.

8. The dust collection accessory according to claim 6 or 7, characterized in that: An annular ventilation space is formed between the inner cylinder and the outer cylinder, and the second dust suction flow path is a flow path that passes through the ventilation space from the second suction port and reaches the dust collection passage.

9. The dust collecting accessory according to any one of claims 1 to 8, characterized in that: A cap for sealing a space between the end tool and the dust suction portion that penetrates therethrough is detachably provided on the side of the dust suction portion opposite to the workpiece.

10. The dust collection accessory according to claim 9, characterized in that: The second suction port includes: an opposite side opening portion opening to the opposite side of the workpiece; and an inner side opening portion communicating with the opposite side opening portion and opening in the inner peripheral surface direction of the inner tube, The cap closes the opposite side opening in a mounted state.

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