WO2016129268A1 - 吸塵ドリル及び吸塵ユニット - Google Patents
吸塵ドリル及び吸塵ユニット Download PDFInfo
- Publication number
- WO2016129268A1 WO2016129268A1 PCT/JP2016/000663 JP2016000663W WO2016129268A1 WO 2016129268 A1 WO2016129268 A1 WO 2016129268A1 JP 2016000663 W JP2016000663 W JP 2016000663W WO 2016129268 A1 WO2016129268 A1 WO 2016129268A1
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- WO
- WIPO (PCT)
- Prior art keywords
- dust
- drill
- dust suction
- tip
- passage
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28D—WORKING STONE OR STONE-LIKE MATERIALS
- B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
- B28D1/14—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by boring or drilling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28D—WORKING STONE OR STONE-LIKE MATERIALS
- B28D7/00—Accessories specially adapted for use with machines or devices of the preceding groups
- B28D7/02—Accessories specially adapted for use with machines or devices of the preceding groups for removing or laying dust, e.g. by spraying liquids; for cooling work
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B51/00—Tools for drilling machines
- B23B51/06—Drills with lubricating or cooling equipment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
- B23Q11/0042—Devices for removing chips
- B23Q11/0046—Devices for removing chips by sucking
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28D—WORKING STONE OR STONE-LIKE MATERIALS
- B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
- B28D1/14—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by boring or drilling
- B28D1/146—Tools therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2226/00—Materials of tools or workpieces not comprising a metal
- B23B2226/75—Stone, rock or concrete
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2251/00—Details of tools for drilling machines
- B23B2251/68—Drills with provision for suction
Definitions
- the present invention relates to a dust-absorbing drill and a dust-absorbing unit that are used when perforating an object to be perforated such as concrete or stone, and absorb dust generated during perforation.
- anchor bolt hole a pilot hole called “anchor bolt hole” is often drilled in advance.
- it is necessary to remove dust such as cutting waste existing in the pilot hole in advance.
- it is also required to consider the work environment so that dust does not diffuse around when drilling concrete or stone.
- Patent Document 1 a dust-absorbing drill that removes dust simultaneously with drilling holes. As shown in FIG. 16, this is formed by forming two slits 29 on the tip surface 3 a of the drill shaft 3 rotating about the axis L and inserting a plate-like cutting blade 21 into each slit 29. The The tip surface of the cutting blade 21 is inclined upward toward the radius center of the drill shaft 3. On the tip surface of the drill shaft 3, a dust suction hole 24 for dust suction is formed on the side of the slit 29. A dust suction device (not shown) is connected to the dust suction hole 24. The dust generated when the drill shaft 3 rotates about the axis L and the workpiece is drilled by the cutting blade 21 is sucked into the dust suction device through the dust suction hole 24.
- An object of the present invention is to provide a dust-absorbing drill with improved dust-absorbing efficiency at the time of drilling.
- the dust-absorbing drill includes a drill tip having a cutting edge formed at the tip and a shaft that is joined to the drill tip and rotates about an axis, and is generated by rotation of the cutting edge inside the shaft.
- a dust suction passage for sucking up dust The cutting edge portion and the drill tip are formed by metal integral processing, A plurality of the cutting blade portions are provided on the tip surface of the drill tip so as to be spaced apart in the circumferential direction, and the plurality of cutting blades formed from the joining ridge lines of the rake face and the flank surface formed on each cutting blade portion are radial.
- a dust suction hole communicating with the dust suction passage is opened close to the chisel point at the rake face or flank face, Alternatively, it is opened close to the chisel point over the joining ridge line of the rake face or flank face.
- the dust suction passage is formed to extend substantially parallel to the axis, and the shaft has an auxiliary passage that communicates with the dust suction passage and into which a removal member for pushing out dust in the dust suction passage can be inserted. It has been established.
- both the cutting edge part and the drill tip are made of metal and are integrally formed, a dust suction hole can be provided close to the chisel point on the rake face or flank face constituting the cutting edge part. Thereby, the dust by a chisel point is efficiently attracted
- dust suction drill dust may get stuck in the dust suction passage. In this case, the removing member is inserted from the auxiliary passage, and the tip of the removing member is put into the dust suction passage. By pushing out dust or the like clogged in the dust suction passage at the tip of the removal member, the dust or the like can be easily removed from the dust suction passage.
- (a), (b) is sectional drawing which shows the member for removal. It is a figure which shows the modification of the member for removal. It is a figure which shows the modification of the member for removal. It is a top view of another dust suction drill. It is side surface sectional drawing of the dust suction drill which attached the auxiliary channel
- FIG. 1 is a plan view of a dust suction drill according to the present embodiment
- FIG. 2 is a front view in which a part thereof is broken at a plane including an AA line
- FIG. 3 is a plan view of the dust suction drill of FIG. FIG.
- the dust-absorbing drill 1 includes a drill tip 2 having a cutting edge portion 20 formed at the tip, a shaft 3 joined to the drill tip 2 and extending along the axis L, and a continuous shaft 3. And a shank portion 9 having a regular polygonal cross section.
- the shank portion 9 is attached to an electric drill device (not shown), and the dust suction drill 1 rotates about the axis L.
- both the drill tip 2 and the shaft 3 are made of metal, and are joined by a joining technique such as welding by electric resistance, brazing welding, or laser welding.
- a dust suction passage 30 for sucking dust generated by the rotation of the cutting blade portion 20 is provided so as to extend along the axis L.
- a dust absorption passage 34 orthogonal to the dust suction passage 30 is provided at the proximal end of the dust suction passage 30 in the shaft 3, and the dust removal passage 34 opens on the side surface of the shaft 3.
- Three cutting blades 20 are provided on the tip surface of the drill tip 2 in the circumferential direction so as to be spaced at substantially equal intervals.
- the three cutting blades 20 are formed on the drill tip 2 by integral machining of a hard metal. ing.
- the cutting edge portion 20 is formed with a rake face 22 in front of the rotational direction R of the dust-absorbing drill 1 and a flank face 23 in the rear of the rotational direction R as is well known, and a joining ridge line between the rake face 22 and the flank face 23. Forms a sharp cutting edge 21.
- the cutting blade 21 is formed radially from the center of the drill tip 2 and forms the highest pointed chisel point P at the center of the drill tip 2.
- each cutting blade 21 is gently inclined from the chisel point P outward in the radial direction of the drill tip 2.
- a dust suction hole 24 communicating with the dust suction passage 30 of the shaft 3 is opened close to the chisel point P. Since the drill tip 2 is made of super hard metal, the dust suction hole 24 is provided at the same time as the drill tip 2 is formed.
- the dust suction holes 24 may be opened by cutting, electric discharge machining, or the like.
- a fitting recess 33 is provided on the peripheral surface of the shaft 3, and the adapter 4 for a dust suction device made of synthetic resin is fitted on the peripheral surface of the shaft 3 so as to cover the fitting recess 33. That is, a part of the peripheral surface of the shaft 3 constitutes an “attachment portion” of the present invention.
- the dust absorber adapter 4 has a through hole 42 communicating with the dust removal passage 34, and the through hole 42 is connected to a dust absorber (not shown) such as a vacuum cleaner. From the inner surface of the dust absorber adapter 4, the fitting projection 43 protrudes inward, the fitting projection 43 fits into the fitting recess 33 of the shaft 3, and the dust absorber adapter 4 comes out of the shaft 3. It is preventing.
- An auxiliary passage 32 that opens obliquely with respect to the dust suction passage 30 and communicates with the dust suction passage 30 is opened behind the housing 31 in the shaft 3.
- the role of the auxiliary passage 32 will be described later.
- (Punching operation) When drilling a drilled object H such as a concrete wall using the dust suction drill 1, first, the dust suction adapter 4 is attached on the peripheral surface of the shaft 3. The chisel point P of the drill tip 2 is applied to the drilled object H, the electric drill device is driven, and the dust-collecting drill 1 is rotated about the axis L. Since the chisel point P has a pointed shape, it makes point contact with the drilled object H during drilling. Thereby, the runout of the dust suction drill 1 can be prevented. In other words, if the tip of the drill tip 2 is linear or planar, the core may run out when the dust suction drill 1 rotates. However, in the dust suction drill 1 according to the present embodiment, this possibility is small.
- the dust suction device is driven according to the rotation of the dust suction drill 1.
- the dust generated by cutting by the cutting blade 21 is sucked into the dust suction device from the dust suction hole 24 through the dust suction passage 30, the dust suction removal passage 34, and the through hole 42. Since the cutting edge portion 20 is formed on the drill tip 2 by metal integral processing, the dust suction hole 24 can be provided close to the chisel point P. Thereby, the dust by the chisel point P and the cutting blade 21 is efficiently sucked into the dust suction hole 24 at the time of drilling.
- the dust drill 1 If the dust drill 1 is rotated and pushed against the drilled object H, a pilot hole with a predetermined depth is opened. At the time of the drilling, dust or the like may be hardened and clogged in the dust suction passage 30. If the dust etc. is clogged, the dust absorption effect is not sufficiently achieved.
- auxiliary passage 32 By providing the auxiliary passage 32 in the shaft 3, dust or the like clogged in the dust suction passage 30 can be removed without extracting the dust suction drill 1 from the pilot hole. If the removal member is inserted from the auxiliary passage 32 to remove the dust and the like and simultaneously suck the dust and the like with the dust suction device, the dust and the like are easily removed and efficient.
- the cutting-blade part 20 is not limited to three.
- the cutting-blade part 20 is not limited to three.
- the cutting-blade part 20 is not limited to three.
- the cutting-blade part 20 is not limited to three.
- the cutting-blade part 20 is not limited to three.
- FIG. 4 even if five cutting blade portions 20 are provided radially around the chisel point P, as shown in FIG. 5, six cutting blade portions 20 are formed radially around the chisel point P. It may be provided.
- one dust suction hole 24 is provided in the rake face 22 or the flank face 23, as shown in FIGS. 4 and 5, two or three or more may be provided. . (Second Embodiment)
- the dust generated at the time of drilling the pilot hole is not absorbed by the dust suction drill 1 and part of the dust is scattered around the pilot hole.
- FIG. 6 is a cross-sectional view of the dust-collecting drill 1 to which the dust-absorbing device adapter 4 is attached, with the dust-scattering prevention cover 5 attached thereto, and FIG.
- the dust absorber adapter 4 includes a first cylinder 40 and a second cylinder 41 extending obliquely from the first cylinder 40 and having a through hole 42 therein.
- the dust scattering prevention cover 5 is formed of a synthetic resin or a rubber material, has a ring shape in plan view, and is formed in a bellows shape outward in the radial direction from the center.
- the dust scattering prevention cover 5 has an opening 50 that fits on the outer periphery of the first cylinder 40 at the center.
- a protrusion 51 is provided on the inner wall of the opening 50, and a recess 44 is provided at a location corresponding to the protrusion 51 on the outer periphery of the dust absorber adapter 4.
- the dust dust scattering prevention cover 5 is fitted from the tip side of the dust suction drill 1, and the protrusion 51 is fitted in the recess 44 in a state where the opening 50 is in contact with the outer periphery of the housing 31 and the first cylinder 40.
- the dust scattering prevention cover 5 is initially attached to the dust suction drill 1, as shown in FIG. 6, the dust scattering prevention cover 5 is located in a plane orthogonal to the shaft 3, and is in a contracted state. In the contracted state, the drill tip 2 is exposed, and the chisel point P of the drill tip 2 can be applied to the target location of the drilled object H.
- the dust scattering prevention cover 5 When the user pushes the peripheral edge of the dust scattering prevention cover 5 in the contracted state forward by hand, the dust scattering prevention cover 5 extends forward as shown in FIG. 7 by the elastic force of the dust scattering prevention cover 5.
- This state is defined as an extended state, and the dust scattering prevention cover 5 covers the drill tip 2 in the extended state. That is, as shown in FIG. 7, in the extended state, the front end of the dust scattering prevention cover 5 is located in front of the drill tip 2 and can cover the pilot hole to be drilled.
- the dust scattering prevention cover 5 is set in the contracted state, the chisel point P of the drill tip 2 is applied to the target location of the drilled object H, and then the dust scattering prevention cover 5 in the contracted state is installed. Set to the stretched state. The front end of the dust scattering prevention cover 5 is in contact with the drilled object H.
- FIG. 8 is a front view showing another dust suction drill 1.
- a housing 31 for restricting the drilling depth of the drill tip 2 is provided between the dust removal passage 34 and the drill tip 2 on the peripheral surface of the shaft 3.
- the dust absorber adapter 4 is fitted on the peripheral surface of the shaft 3 such that the front end portion is in contact with the housing 31.
- the casing 31 and the rear portion of the casing 31 on the peripheral surface of the shaft 3 constitute the “attachment portion” of the present invention.
- FIG. 9 is a diagram showing a drilling operation when the drilled object H is a ceiling wall.
- the dust suction drill 1 When the dust suction drill 1 is pushed forward while rotating, even if dust is sucked from the dust suction hole 24, a part of the dust is scattered outward from the pilot hole.
- the extended dust scattering prevention cover 5 covers the pilot hole, the dust scattered when the pilot hole is drilled is accommodated in the dust scattering prevention cover 5 and is prevented from scattering outside the dust scattering prevention cover 5. . Thereby, the bad influence which the dust which scatters has on the circumference
- the dust scattering prevention cover 5 has elasticity, when the dust suction drill 1 is pushed during drilling of the pilot hole, the dust scattering prevention cover 5 is accompanied by the peripheral portion of the opening 50 as shown in FIG. Deforms to shrink. Therefore, the dust scattering prevention cover 5 does not disturb the forward movement of the dust suction drill 1.
- the dust suction drill 1 can be extracted from the pilot hole, and the dust scattering prevention cover 5 can be pushed back into the contracted state by hand to proceed to the next pilot hole drilling operation.
- the protrusion 51 may be extracted from the recess 44, and the dust scattering prevention cover 5 may be pulled forward against the friction with the casing 31.
- a dust scattering prevention cover 5 is attached to the dust suction drill 1 to constitute a dust suction unit 7 (see FIG. 9).
- the dust suction drill 1 constituting the dust suction unit 7 may not be the dust suction drill 1 in which the dust suction hole 24 approaches the chisel point P. That is, even in the conventional dust suction drill 1 shown in FIG. 16, the dust suction unit 7 can be configured.
- some dust suction drills 1 have the tip of the dust suction passage 30 of the shaft 3 opened on the side surface of the shaft 3, but even with such a dust suction drill 1, the dust suction unit 7 can be configured. .
- FIGS. 10A and 10B are cross-sectional views showing the removal member 8.
- the removal member 8 is formed of a long coil spring extending in one direction, and has an outer diameter slightly smaller than the inner diameter of the auxiliary passage 32.
- the removal member 8 is inserted into the auxiliary passage 32, bent at the intersection of the dust suction passage 30 and the auxiliary passage 32, and then enters the dust suction passage 30. Since the removing member 8 must be pushed out by breaking up the dust in the dust suction passage 30, it should not be easily deformed by contacting the dust.
- the removal member 8 is formed of a coil spring having a wire diameter larger than a predetermined value so as to be deformable and rigid.
- the removing member 8 is formed in a left-handed manner when viewed from the base end portion.
- the removal member 8 is inserted into the auxiliary passage 32, and after passing through the intersection of the dust suction passage 30 and the auxiliary passage 32, the tip is inserted into the dust suction passage 30.
- the rotary electric motor 100 is attached to the proximal end portion of the removing member 8, and the removing member 8 is rotated clockwise around the central axis L1 extending in the longitudinal direction when viewed from the proximal end portion. Since the removing member 8 is a left-handed coil spring, when the removing member 8 is rotated to the right, the removing member 8 is contracted so that the coil spring comes into close contact therewith.
- the rigidity of the member 8 for removal can further be improved, and the dust in the dust suction passage 30 can be easily removed.
- the winding direction of the coil spring of the removing member 8 may be opposite to the rotational driving direction of the rotary electric motor 100.
- the removing member 8 may be a right-handed coil spring, and the removing member 8 may be rotated counterclockwise.
- a reduced diameter portion 80 having a smaller winding diameter than a portion other than the distal end portion may be provided at the end portion on the insertion side of the removing member 8 into the auxiliary passage 32, that is, the distal end portion.
- the removal member 8 can be easily inserted into the auxiliary passage 32.
- a metal pointed member 81 having a pointed tip may be provided at the tip of the removing member 8. By rotating the pointed member 81 together with the removing member 8 so as to bite into the dust in the dust suction passage 30, the dust is easily broken down and pushed out.
- the dust suction drill 1 and the dust suction unit 7 according to the present embodiment have the following effects. 1. Since the cutting blade portion 20 is formed on the drill tip 2 by metal integral processing, a dust suction hole 24 may be provided close to the chisel point P on the rake face 22 or the flank surface 23 constituting the cutting blade portion 20. I can do it. Thereby, the dust by the chisel point P is efficiently sucked into the dust suction hole 24 at the time of drilling. Further, since the chisel point P has a pointed shape, it makes point contact with the drilled object during drilling. Thereby, the runout of the dust suction drill 1 can be prevented. 2.
- the dust suction holes 24 are opened close to the chisel point P on the rake face 22 or the flank face 23.
- the dust suction hole 24 is opened close to the chisel point P over the joining ridge line M (that is, the cutting edge 21) between the rake face 22 and the flank face 23. Also good.
- an auxiliary passage closing cover 6 may be provided on the shaft 3 or the shank portion 9 behind the dust suction device adapter 4. As shown in FIGS. 15 (a) and 15 (b), this is a cover in which one passage hole 60 facing the auxiliary passage 32 is opened on one side, and the shaft 3 or shank is centered on the axis L. It can be rotated on the part 9. As shown in FIG. 14, the removal member 8 can be inserted into the auxiliary passage 32 through the passage hole 60 with the passage hole 60 facing the auxiliary passage 32. From the state shown in FIG. 14, the auxiliary passage 32 can be closed by rotating the auxiliary passage closing cover 6 about the axis L and releasing the opposing state between the passage hole 60 and the auxiliary passage 32.
- the auxiliary passage closing cover 6 When the dust suction drill 1 is in normal use and the removal member 8 is not used, the auxiliary passage closing cover 6 is attached to the shaft 3 or the shank portion 9 so that the passage hole 60 does not face the auxiliary passage 32. This is a closed state. In this closed state, if the through hole 42 is attached to the dust suction device, the auxiliary passage 32 is closed, so the dust suction force of the dust suction device does not decrease.
- the auxiliary passage closing cover 6 When the removal member 8 is used, the auxiliary passage closing cover 6 may be rotated about the axis L and the passage hole 60 may be opposed to the auxiliary passage 32 as described above. This is an open state.
- the material of the auxiliary passage closing cover 6 is not limited. However, for example, if the auxiliary passage closing cover 6 is formed of rubber having a large friction coefficient with the dust suction drill 1, there is an advantage that the auxiliary passage closing cover 6 does not rotate easily when the dust suction drill 1 is used. Although one passage hole 60 is provided in the auxiliary passage closing cover 6, a plurality of passage holes 60 may be provided as long as the auxiliary passage 32 can be closed.
- the present invention is useful when drilling an object to be drilled such as concrete or stone, and is useful when applied to a dust-absorbing drill and a dust-absorbing unit that absorb dust generated during drilling.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Processing Of Stones Or Stones Resemblance Materials (AREA)
- Auxiliary Devices For Machine Tools (AREA)
- Working Measures On Existing Buildindgs (AREA)
- Drilling And Boring (AREA)
- Drilling Tools (AREA)
Abstract
Description
本発明の目的は、穿孔時に塵芥の吸塵効率を高めた吸塵ドリルを提供することにある。
前記切刃部と前記ドリルチップとは、金属の一体加工によって形成されて、
前記切刃部は、前記ドリルチップの先端面に周方向に離間して複数設けられ、各切刃部に形成されるすくい面と逃げ面との接合稜線から形成される複数の切り刃は放射状に配置されて、前記ドリルチップの中心にて尖頭状のチゼルポイントを形成し、前記吸塵通路に連通した吸塵孔が、前記すくい面又は逃げ面にて前記チゼルポイントに接近して開設され、或いは前記すくい面又は逃げ面の接合稜線に掛って前記チゼルポイントに接近して開設されている。
2.吸塵ドリルの使用時に、吸塵通路内に塵芥等が詰まる場合がある。この場合は、補助通路から除去用部材を挿入して、該除去用部材の先端を吸塵通路内に入れる。除去用部材の先端にて吸塵通路内に詰まった塵芥等を押し出すことにより、該塵芥等を吸塵通路から容易に除去することができる。
以下、本発明の実施形態を、図を用いて詳述する。なお、以下の記載では全ての図面において、同一又は相当部分には同一符号を付し、重複する説明を省略する。
(穿孔動作)
吸塵ドリル1を用いてコンクリート壁のような被穿孔物Hに穿孔する際には、先ずシャフト3の周面上に吸塵装置用アダプタ4を取り付ける。ドリルチップ2のチゼルポイントPを被穿孔物Hに当てて、電動ドリル装置を駆動して、吸塵ドリル1を軸線Lを中心として回転させる。チゼルポイントPは尖頭状であるから、穿孔時に被穿孔物Hとは点接触する。これにより吸塵ドリル1の芯振れを防ぐことが出来る。つまり、ドリルチップ2の先端は線状又は面状であれば、吸塵ドリル1の回転時に芯振れすることがあるが、本実施形態に係る吸塵ドリル1にあっては、この虞は少ない。
(第2の実施形態)
下穴の穿孔時に生じる塵芥は、全て吸塵ドリル1に吸塵されず、一部は下穴の周囲に飛散する。図1に示す吸塵ドリル1及び従来の吸塵ドリルではこの下穴の周囲に飛散した塵芥までは十分に吸引されない。このため、下穴の周囲にまで粉塵が飛散し、悪影響を及ぼす問題があった。本発明者はこの点に鑑みて、吸塵ドリルに塵芥飛散防止カバーを着脱自在に取り付けることを着想した。
(除去用部材)
上記にて、補助通路32から除去用部材を挿入して、吸塵通路30内に詰まった塵芥等を崩して押し出すとした。図10(a)、(b)は、この除去用部材8を示す断面図である。除去用部材8は一方向に延びた長尺状のコイルバネから形成されて、該補助通路32の内径よりも少し小さな外径を有する。除去用部材8は補助通路32に挿入されて、吸塵通路30と補助通路32との交点にて屈曲した後に吸塵通路30に入る。除去用部材8は、吸塵通路30内の塵芥等を崩して押し出さなければならないから、塵芥等に接触して容易に変形してはならない。この理由から、除去用部材8を変形可能且つ剛性を有するように、所定以上の線径を有するコイルバネから形成している。図10(a)、(b)に示す実施形態では、除去用部材8は基端部から見て左巻きに形成されている。
(除去用部材の変形例)
図11に示すように、除去用部材8の補助通路32への挿入側端部、即ち先端部に該先端部以外の箇所よりも巻き径が小さな縮径部80を設けてもよい。これにより、除去用部材8は補助通路32へ挿入し易くなる。また、先端が縮径部80となっているので、塵芥等に食い込み易く、塵芥等を除去し易い。
また、図12に示すように、除去用部材8の先端部に先が尖った金属製の尖頭部材81を設けてもよい。除去用部材8とともに該尖頭部材81を回転させて、吸塵通路30内の塵芥に食い込ませることにより、塵芥を崩して押し出し易くなる。
1.切刃部20はドリルチップ2に、金属の一体加工によって形成されているから、切刃部20を構成するすくい面22又は逃げ面23に吸塵孔24をチゼルポイントPに接近して設けることが出来る。これにより、穿孔時にチゼルポイントPによる塵芥が吸塵孔24に効率よく吸引される。また、チゼルポイントPは尖頭状であるから、穿孔時に被穿孔物とは点接触する。これにより吸塵ドリル1の芯振れを防ぐことが出来る。
2.吸塵ドリル1の使用時に、吸塵通路30内に塵芥等が詰まった場合は、補助通路32から除去用部材を挿入して、該除去用部材の先端を吸塵通路30内に入れる。除去用部材の先端にて吸塵通路30内に詰まった塵芥等を押し出すことにより、該塵芥等を吸塵通路30から容易に除去することができる。
3.穿孔時には、吸塵孔24から塵芥を吸塵していても、塵芥の一部は下穴から外向きに飛散する。しかし、塵芥飛散防止カバー5が下穴に被さるから、下穴穿孔時に飛散する塵芥は塵芥飛散防止カバー5内に収まり、該塵芥飛散防止カバー5の外側に飛散することが防止される。これにより、飛散する塵芥が下穴の周囲に与える悪影響を緩和することが出来る。
2 ドリルチップ
3 シャフト
4 吸塵装置用アダプタ
5 塵芥飛散防止カバー
6 補助通路塞ぎカバー
7 吸塵ユニット
8 除去用部材
20 切刃部
21 切り刃
22 すくい面
23 逃げ面
24 吸塵孔
30 吸塵通路
32 補助通路
Claims (9)
- 先端部に切刃部を形成したドリルチップと、該ドリルチップに接合され軸線を中心として回転するシャフトを備え、該シャフトの内部に前記切刃部の回転により生じた塵芥を吸塵するための吸塵通路を開設した吸塵ドリルであって、
前記切刃部と前記ドリルチップとは、金属の一体加工によって形成されて、
前記切刃部は、前記ドリルチップの先端面に周方向に離間して複数設けられ、各切刃部に形成されるすくい面と逃げ面との接合稜線から形成される複数の切り刃は放射状に配置されて、前記ドリルチップの中心にて尖頭状のチゼルポイントを形成し、前記吸塵通路に連通した吸塵孔が、前記すくい面又は逃げ面にて前記チゼルポイントに接近して開設され、或いは前記すくい面及び逃げ面の接合稜線に掛って前記チゼルポイントに接近して開設されている、吸塵ドリル。 - 前記吸塵通路は前記軸線と略平行に延びるように形成され、前記シャフトには、前記吸塵通路に連通し、前記吸塵通路内の塵芥を押し出すための除去用部材が挿入可能な補助通路が開設されている、請求項1に記載の吸塵ドリル。
- 前記除去用部材は、長尺状のコイルバネから形成されて、前記補助通路に挿入された状態で中心軸を中心として回転駆動され、該コイルバネの巻き方向は回転駆動方向とは互いに逆である、請求項2に記載の吸塵ドリル。
- 前記シャフトには、前記軸線を中心として回転し、該回転によって前記補助通路の閉塞と開放を切り換える補助通路塞ぎカバーが取り付けられる、請求項2又は3に記載の吸塵ドリル。
- 前記シャフトには軸線に沿って前記ドリルチップから離間した箇所に、前記ドリルチップによって穿孔される下穴に被さる塵芥飛散防止カバーが着脱可能に取り付けられる、請求項1乃至4の何れかに記載の吸塵ドリル。
- 前記ドリルチップから離間した箇所に、前記吸塵通路に連通する吸塵装置用アダプタが取り付けられる取付部が設けられ、
前記塵芥飛散防止カバーは、前記取付部又は前記吸塵装置用アダプタに着脱可能に取り付けられる、請求項5に記載の吸塵ドリル。 - 前記塵芥飛散防止カバーは、前記ドリルチップを覆って下穴に被さる伸長状態と、前記ドリルチップを露出させる収縮状態との間を弾性変形可能に設けられた、請求項5又は6に記載の吸塵ドリル。
- 前記シャフトには、前記ドリルチップの穿孔深さを規制する鍔体が設けられた、請求項1乃至7の何れかに記載の吸塵ドリル。
- 先端部に切刃部を形成したドリルチップと、該ドリルチップに接合され軸線を中心として回転するシャフトを備え、該シャフトの内部に前記切刃部の回転により生じた塵芥を吸塵するための吸塵通路を開設した吸塵ドリルと、
該吸塵ドリルに着脱可能に取り付けられて、前記ドリルチップによって穿孔される下穴に被さる塵芥飛散防止カバーとを備えた、吸塵ユニット。
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EP16748914.5A EP3257643B1 (en) | 2015-02-13 | 2016-02-09 | Dust suction drill, system and dust suction unit |
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KR1020177004035A KR102442627B1 (ko) | 2015-02-13 | 2016-02-09 | 흡진 드릴 및 흡진 유닛 |
US15/550,736 US10335980B2 (en) | 2015-02-13 | 2016-02-09 | Dust suction drill and dust suction unit |
ES16748914T ES2801055T3 (es) | 2015-02-13 | 2016-02-09 | Broca con aspiración de polvo, sistema y unidad de aspiración de polvo |
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