WO2012099509A1 - Ensemble de coupe et de collecte de poussière ou de boue et machine de travail - Google Patents

Ensemble de coupe et de collecte de poussière ou de boue et machine de travail Download PDF

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Publication number
WO2012099509A1
WO2012099509A1 PCT/SE2011/050053 SE2011050053W WO2012099509A1 WO 2012099509 A1 WO2012099509 A1 WO 2012099509A1 SE 2011050053 W SE2011050053 W SE 2011050053W WO 2012099509 A1 WO2012099509 A1 WO 2012099509A1
Authority
WO
WIPO (PCT)
Prior art keywords
cover device
blade
saw blade
cut
blade guard
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/SE2011/050053
Other languages
English (en)
Inventor
Pär CARLSSON
Håkan PINZANI
Paulo VARELLA
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Husqvarna AB
Original Assignee
Husqvarna AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Husqvarna AB filed Critical Husqvarna AB
Priority to PCT/SE2011/050053 priority Critical patent/WO2012099509A1/fr
Priority to BR112013018022-6A priority patent/BR112013018022A2/pt
Priority to CN201710930804.5A priority patent/CN107511935B/zh
Priority to CN201510434824.4A priority patent/CN104985703B/zh
Priority to RU2013138401/02A priority patent/RU2013138401A/ru
Priority to AU2012207659A priority patent/AU2012207659B2/en
Priority to US13/980,564 priority patent/US9662800B2/en
Priority to EP12736643.3A priority patent/EP2665573B1/fr
Priority to JP2013549385A priority patent/JP5612781B2/ja
Priority to CN201280005632.6A priority patent/CN103328144B/zh
Priority to PCT/SE2012/000002 priority patent/WO2012099522A1/fr
Priority to CA3027394A priority patent/CA3027394C/fr
Priority to EP20185021.1A priority patent/EP3741486B1/fr
Priority to CA2824577A priority patent/CA2824577C/fr
Publication of WO2012099509A1 publication Critical patent/WO2012099509A1/fr
Anticipated expiration legal-status Critical
Priority to JP2014096245A priority patent/JP5795662B2/ja
Priority to US15/497,400 priority patent/US11919199B2/en
Priority to AU2017204410A priority patent/AU2017204410B2/en
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • B28D1/02—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing
    • B28D1/04—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing with circular or cylindrical saw-blades or saw-discs
    • B28D1/045—Sawing grooves in walls; sawing stones from rocks; sawing machines movable on the stones to be cut

Definitions

  • the present invention relates to a cutting and dust or slurry collecting assembly for the provision of a kerf (saw cut) with significant depth in a working object, and for collecting and leading away dust or slurry which is generated. Slurry is generated when water is sprayed onto a saw blade to cool it and/or to reduce dust. Slurry can be sucked away by a vacuum source.
  • the invention also relates to a dust or slurry collecting unit included in the assembly, a cover device included in the dust collecting unit, and a working machine which is provided with a cutting and dust or slurry collecting assembly according to the invention.
  • the invention relates to devices of the said kind for making openings in working objects like walls, ceilings, and floors of concrete, stone, brick, and plasterboard in the construction industry, and for cutting blocks and columns of concrete, stone, and the like.
  • working objects like walls, ceilings, and floors of concrete, stone, brick, and plasterboard in the construction industry
  • cutting blocks and columns of concrete, stone, and the like Such objects often may have large dimensions, but that is not any condition for the applications of the invention.
  • cutting assembly not only includes assemblies for cutting off a work piece but also assemblies for sawing or cutting in objects more generally, for example making holes or openings in work pieces. Normally, “cutting assemblies”, such as the cutting assembly according to the invention, can perform all these kinds of work.
  • sawing and cutting in the following generally referred to as sawing, in this text shall mean every kind of making kerfs/cuts in working objects by means of disk-shaped rotary tools, the working part of which is localized to the periphery of the tool, whether the tool is provided with teeth or not.
  • the tool consists of a diamond equipped saw blade or a cutting disc, in the following commonly referred to as saw blade.
  • the invention relates to a cutting and dust or slurry collecting assembly that comprises:
  • a circular saw blade having a first side, a second side, a peripheral portion defining the working part of the saw blade, and a centre of rotation
  • a blade guard extending over the saw blade around at least half of its circumference
  • a cover device which is elongated in a direction perpendicular to said centre of rotation, and the cover device has a front end, a rear end, a top surface, a bottom surface, elongated sidewalls and possible inner sidewalls, and a longitudinal passage for the saw blade, said passage extending through the cover device from its top surface to its bottom surface in a region between the front and rear ends of the cover device,
  • the blade guard and the cover device being pivotally connected or connectable to one another via a hinge in or adjacent to a lower rear corner of the blade guard, such that the cover device and the blade guard can be turned in relation to each other so the saw blade can be moved up and down said passage at least during cutting,
  • a discharge member is provided at the rear of said hinge and has an outlet which can be connected to a vacuum source
  • connection member connects the discharge member with at least one of the longitudinal passage and the cut created rear of the longitudinal passage
  • the direction of rotation of the saw blade is such that a circumferential part of the blade which has passed beyond the bottom surface of the cover device will move in a direction upwards-rearwards towards the bottom surface, said direction being clock- wise when the saw blade is viewed in a direction towards the first side of the blade.
  • this known hood- shaped blade guard completely surrounds that part of the saw blade which is not located in the work piece, and that the blade guard contacts the surface of the work piece, which surface is supposed to be essentially flat, and with good sealing action, in order that the device shall function well as a dust collector.
  • the blade guard thus shall function like a suction box, in which a sufficient underpressure must be maintained in order to suck up into the blade guard that dust which is generated in the kerf and which is not thrown backwards-upwards by the tool. At the same time, dust must not be scattered to the environment from the kerf and/or due to leakage between the blade guard and the top surface of the work piece.
  • the first problem is that the volume in the suction box, i.e. the interior volume of the hood-shaped blade guard, is
  • US 5,774,992 discloses a dust collecting shroud for removably attaching to a circular saw.
  • the shroud is attached in a fixed location and will therefore pick up very little dust at the early stages of the cut before the saw reaches the set saw depth. Further the shroud id arranged to suck sideways from the saw blade.
  • US 2008/0163492 shows a very different cutting and dust collecting assembly and is hereby incooperated by reference in its intirety. It has an elongated cover device of approximately the same width as its blade guard. The cover device is joined to the blade guard with a hinge, so the cover device is intended to be in contact with the structure all the time from the start of the cut until full depth of the cut. So this active hinge is a clear improvement. However inside the cover device there is a sealing that does not only decrease air leakage around the saw blade, but does also block air flow rearwards inside the cover device towards a vacuum source arranged in the rear. Instead the complete flow must follow the kerf under the block in the cover device and up into the vacuum source.
  • the cover device is spring loaded to swing down with its forward end. This end will therefore protrude and be a bother during transport etc. But it will also hide the saw blade, so it is difficult for the operator to start the cut correctly. Further the cover device always protrudes in front of the saw blade giving a bad visibility of the cut for the operator. All this causes using and efficiency difficulties for the operator.
  • a rear arm distance, LR, between a hinge, connecting the cover device and the blade guard, and a rear end of the cover device is bigger than 0,2 times a blade radius,R, and preferably bigger than 0,25 R.
  • LR is bigger than 0,3R and preferably bigger than 0,35R and most preferably bigger than 0,4R.
  • the increased rear arm distance, LR provides a possibility to operate the machine and assembly in a completely new way. It is possible to turn the cover device downwards by gently pressing the rear end of the cover device against the structure to be cut. This enables to arrange the cover device in a normal high position with its front end close to the blade guard.
  • the cover device is preferably arranged in its normal high position in that the hinge is arranged with a spring force urging the front end up towards the blade guard, acc. to claim 10.
  • the hinge is arranged with a friction device or a lock up device strong enough to hold the cover device in a desired turning location, but weak enough to give way when the rear end is pressed gently against the structure to be cut, acc to claim 11. So compared to US2008/0163492 this provides a new and more efficient way to operate the machine and assembly.
  • the front end will end up inside the periphery of the saw blade at least when the cover device is turned upwards towards the blade guard, so the longitudinal passage runs all the way through the front end, i.e. in a forklike manner, acc to claim 9. This will provide a much better visibility for the operator, as a big part of the saw blade periphery will never be hidden by the cover device.
  • a connection member connects to a longitudinal passage for the saw blade arranged by providing a communication within the cover device, thereby enabling an efficient removal of dust or slurry also when starting the cut and during shallow depth of the cut.
  • This communication has no obstruction in total contrast to the block of US 2008/0163492, that had to suck only through the kerf. Therefore there is now an efficient suction from the longitudinal passage rearwards inside the cover device to a discharge member. As said this is a lot more efficient when starting the cut and during shallow depth of the cut. However it also adds to the efficiency for deep cuts as the sides of the saw blade, and especially the diamond segments and slots between them, will bring dust and slurry up into the longitudinal passage that will best be sucked away rearwards inside the cover device.
  • connection member also connect to the cut by having a slot in the bottom surface arranged at least over a part of the length of the bottom surface rear of the longitudinal passage, thereby also enabling an efficient removal of dust or slurry during a deeper depth of cut. So the slot provides a second way of picking up dust or slurry through the bottom surface of the cover device.
  • the invention has been developed in the first case for portable manually operated machines. Therefore, other objectives of the invention is to provide a working machine and an assembly of the above mentioned type intended for the machine, which is easy to operate forwards as well as rearwards, horizontally as well as vertically; in short, satisfies high ergonomic demands.
  • the cutting and dust collecting assembly comprises
  • the term "slot" shall not be interpreted in any restricting sense as far as the width of the slots is concerned. The width can namely be quite large and extend over the major part of the top surface and over a significant portion of the bottom surface, respectively. However, the width is significant smaller than the length of the slot. Therefore the term "slot" in this connection after all should be adequate.
  • said parts of the cover device are made of steel or other suitable metal material.
  • the slot may have a thickness of appr.lO mm.
  • the invention also relates to the working machine which is provided with a cutting and dust collecting assembly according to the invention.
  • the working machine includes, in a mode which can be conventional, a driving unit with a driving motor and operating members, and consists according to the invention typically of a portable hand-held machine.
  • the motor may be electric or hydraulic or may be of a combustion engine type.
  • the operating members typically include a rear handle with control members and a front handle.
  • the blade guard, and the cover device which is turnably connected with the blade guard are connected with the driving unit via said side portion of the second side wall of the blade guard, which is connected with the driving unit on one side of the driving unit in the front end portion of the driving unit, turnably about the centre of rotation of the saw blade, while the saw blade is mounted on a driving shaft which extends sideways from the driving unit through said side portion on the second side of the saw blade, said saw blade being rotatable by means of said driving shaft about said centre of rotation in the clock-wise direction, when the saw blade is viewed in a direction towards the first side of the saw blade.
  • This means that dust and other fragments which are loosened from the working object by means of the saw blade is moved backwards in the kerf.
  • Fig. 1 is a rear perspective view of a cutting and dust collecting assembly according to the invention, as seen by the operator from the right side and with its cover device in a normal cutting position.
  • Fig. 2 shows the assembly of Fig 1, but with its cover device in a raised position suitable for starting to cut.
  • Fig. 3 is a side view corresponding to Fig 1.
  • Fig. 4 is a side view also corresponding to Fig 1, but seen from the opposite, left, side.
  • Fig. 5 is left perspective view showing the cover device and the blade guard in a position ready for attaching to the cover device.
  • Fig. 6 is an enlarged view in section showing an interior of the cover device and a hinge between the cover device and the blade guard.
  • a working machine is generally designated 1. Its main parts consist of a driving unit 2 and a cutting and dust collecting assembly 3.
  • the driving unit 2 may be of any known type, comprising an electric motor, combustion engine or hydraulic motor. According to the embodiment, the driving unit 2 is an electric driving unit of a known type, disclosed in WO 03/057395.
  • the cutting and dust collecting assembly 3 includes a circular saw blade 4, a blade guard 5, and a cover device 6.
  • the driving unit 2 is in a mode known per se provided with front and rear operating handles 7 and 8, respectively, a control device 9 for the electric motor, not shown, in the driving unit 2 and a driving shaft 22.
  • the saw blade 4 has a first side 20, which is turned from the driving unit 2, and a second side 21, Fig. 4, which faces the driving unit 2.
  • a side wall facing said second side 21 of the saw blade is designated 13.
  • the driving shaft 22 forms a part of the driving unit 2. Therefore, per definition, it does not form part of the cutting and dust collecting assembly 3.
  • the driving shaft 22 extends sideways out from the front part of the driving unit through the aperture 14 in the side wall 13 on the second side 21 of the saw blade.
  • the saw blade 4 can be rotated by means of the driving shaft 22 about the axis of rotation 23 of the saw blade and of the driving shaft in a clockwise direction, when the saw blade is viewed in a direction towards the first side 20 of the saw blade.
  • the blade guard 5 can be turned relative to the driving unit 2 about the centre of rotation 23 of the saw blade by mean of the front and rear control handles 7, 8, as the cover device 6 is being pressed against a work object, so that the driving unit 2 can be afforded apposition or be maintained in a position which is comfortable for the operator, independent of the position of the cover device 6.
  • said centre of rotation 23 defines a first centre of turning of the cutting and dust collecting assembly 3.
  • a circular driving disc 28 is provided on the first side 20 of the saw blade 4, and on the second side 21 of the saw blade an identical driving disc 28 is pressed against said side of the saw blade inside the blade guard 5.
  • the driving shaft 22 extends through the two driving discs which hold the saw blade 4 clamped between them.
  • the periphery of the saw blade 4 is diamond equipped in a manner known per se. The diamond segments are usually wider than the blank. Therefore they and the slots between the segments tend to transport dust or slurry. But also the blank itself will lift dust or slurry.
  • the cover device 6 has a front end 31 , a rear end 32, a bottom surface 36 and a top with a top surface 34 and two elongated side walls 35.
  • the cover device can be made of cast aluminium or moulded plastic.
  • the bottom surface 36 is mostly flat, but has upwards pointing ends.
  • the bottom surface is preferably covered with a plate of wear resistant material like stainless steel. Often there are also inner side walls (not shown).
  • the cover device 6 is united with the blade guard 5 through a hinge 40. Therefore the cover device can be turned upwards and downwards around the hinge in relation to the blade guard. As shown in figure 3 the hinge is located on a distance LR from the rear end 32 and on a front end distance LF from the front end 32.
  • the cover device is spring loaded to turn upwards around hinge 40 as shown in figure 2, while figure 1 shows a normal cutting position.
  • a discharge member 52 with an outlet 58 that can be attached to a vacuum source like a vacuum cleaner.
  • the cover device will swing around hinge 40 until the bottom surface 36 is in contact with the structure. This has the great advantage that it is easy to establish a cut because the cover device is in a top position providing very good visibility of the lower side of the saw blade 4. But as soon as possible the cover device will be pressed down to be even more efficient in picking up dust or slurry.
  • a top slot 45 and a corresponding bottom slot 46(not shown) form a longitudinal passage 45, 46 for the saw blade.
  • This passage is shown in figure 6 and goes all the way to the front end 31.
  • a discharge member 52 is located behind the hinge 40.
  • a bottom slot 46 is provided in the bottom surface 36 and runs all the way of the connection member 12 and of the longitudinal passage 45, 46. It is appr. 10 mm wide and could also be interrupted during the connection member 12.
  • Figure 5 shows that the hinge 40 is arranged in a blade guard receiver 60 and that the blade guard 5 can be pushed or moved into it and be locked to it, preferably by a quick-release lock 61, 62.
  • the blade guard is supplied with an attachment pattern 63, preferably a molded pattern, to fit in the blade guard receiver 60.
  • the molded pattern does not increase the cost of blade guards 5.
  • the attachment pattern 63 has ridges to cooperate with ridges in the blade guard receiver 60. Further it has a top shoulder that the quick release lock 61 presses against when mounted, compare fig 6.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Sawing (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)

Abstract

L'invention porte sur un ensemble de coupe et de collecte de poussière ou de boue qui comprend : a) une lame de scie circulaire (4), b) un carter de lame (5), c) un dispositif de capot (6), et le dispositif de capot (6) possédant une extrémité avant (31), une extrémité arrière (32), une surface supérieure (34), une surface inférieure (36), des parois latérales allongées (35) et un passage longitudinal (45, 46) pour la lame de scie, d) le carter de lame (5) et le dispositif de capot (6) étant reliés ou pouvant être reliés de façon pivotante l'un à l'autre par l'intermédiaire d'une charnière (40) située dans un angle arrière inférieur du carter de lame (5) ou à proximité de cet angle, de sorte que le dispositif de capot et le carter de lame puissent tourner l'un par rapport à l'autre, e) un élément d'évacuation (52) est disposé en arrière de ladite charnière et présente une sortie (58) qui peut être relié à une source de vide, f) un élément de raccordement (12) raccorde l'élément d'évacuation (52) à au moins l'un, du passage longitudinal (45, 46) et de la coupe créée en arrière du passage longitudinal, g) le sens de rotation de la lame de scie (4) est tel qu'une partie circonférentielle de la lame qui est passée au-delà de la surface inférieure du dispositif de capot se déplace vers le haut et en arrière vers la surface inférieure. En particulier, une distance de bras arrière (Lr) entre la charnière (40) et l'extrémité arrière (32) est supérieure à 0,2R et de préférence supérieure à 0,25R, en permettant ainsi de faire tourner le dispositif de capot (6) en exerçant une pression sur l'extrémité arrière (32) en direction de la structure qu'il s'agit de couper.
PCT/SE2011/050053 2011-01-18 2011-01-18 Ensemble de coupe et de collecte de poussière ou de boue et machine de travail Ceased WO2012099509A1 (fr)

Priority Applications (17)

Application Number Priority Date Filing Date Title
PCT/SE2011/050053 WO2012099509A1 (fr) 2011-01-18 2011-01-18 Ensemble de coupe et de collecte de poussière ou de boue et machine de travail
CN201280005632.6A CN103328144B (zh) 2011-01-18 2012-01-18 切割并收集粉尘或泥浆的组件以及加工机器
PCT/SE2012/000002 WO2012099522A1 (fr) 2011-01-18 2012-01-18 Ensemble de coupe et de collecte de poussière ou de boue et machine-outil
CN201510434824.4A CN104985703B (zh) 2011-01-18 2012-01-18 刀片护罩组件、防溅罩组件及切割组件和加工机器
RU2013138401/02A RU2013138401A (ru) 2011-01-18 2012-01-18 Режущий и собирающий пыль и грязь узел и рабочая машина
AU2012207659A AU2012207659B2 (en) 2011-01-18 2012-01-18 Cutting and dust or slurry collecting assembly and working machine
US13/980,564 US9662800B2 (en) 2011-01-18 2012-01-18 Cutting and dust or slurry collecting assembly and working machine
EP12736643.3A EP2665573B1 (fr) 2011-01-18 2012-01-18 Dispositif de couverture pour un ensemble de coupe et de collecte de poussière ou de boue
JP2013549385A JP5612781B2 (ja) 2011-01-18 2012-01-18 切断して粉塵又はスラリを収集する組立体、切断して粉塵又はスラリを収集する組立体に含まれるようにされているカバーデバイス、粉塵又はスラリを収集するユニット及び工作機械
BR112013018022-6A BR112013018022A2 (pt) 2011-01-18 2012-01-18 unidade de coleta de aparas e pó ou lama, e máquina de operação
CN201710930804.5A CN107511935B (zh) 2011-01-18 2012-01-18 切割并收集粉尘或泥浆的组件
CA3027394A CA3027394C (fr) 2011-01-18 2012-01-18 Ensemble de coupe et de collecte de poussiere ou de boue et machine-outil
EP20185021.1A EP3741486B1 (fr) 2011-01-18 2012-01-18 Ensemble protège-lame
CA2824577A CA2824577C (fr) 2011-01-18 2012-01-18 Ensemble de coupe et de collecte de poussiere ou de boue et machine-outil
JP2014096245A JP5795662B2 (ja) 2011-01-18 2014-05-07 刃体ガード組立体、切断組立体及び工作機械
US15/497,400 US11919199B2 (en) 2011-01-18 2017-04-26 Cutting and dust or slurry collecting assembly and working machine
AU2017204410A AU2017204410B2 (en) 2011-01-18 2017-06-28 Cutting and dust or slurry collecting assembly and working machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/SE2011/050053 WO2012099509A1 (fr) 2011-01-18 2011-01-18 Ensemble de coupe et de collecte de poussière ou de boue et machine de travail

Publications (1)

Publication Number Publication Date
WO2012099509A1 true WO2012099509A1 (fr) 2012-07-26

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Application Number Title Priority Date Filing Date
PCT/SE2011/050053 Ceased WO2012099509A1 (fr) 2011-01-18 2011-01-18 Ensemble de coupe et de collecte de poussière ou de boue et machine de travail

Country Status (1)

Country Link
WO (1) WO2012099509A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110725316A (zh) * 2019-09-20 2020-01-24 杨君成 一种用于圆柱切割的立式切桩机
CN112638610A (zh) * 2018-10-01 2021-04-09 喜利得股份公司 用于岩芯钻机的提取装置
CN112638609A (zh) * 2018-10-01 2021-04-09 喜利得股份公司 用于岩芯钻机的提取装置
US12420371B2 (en) 2021-11-30 2025-09-23 Eric Strahan Dust containment assembly

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080163492A1 (en) * 2005-02-18 2008-07-10 Mats Johansson Cutting and Dust Collecting Assembly and Working Machine with Such Assembly
US20090236900A1 (en) * 2008-01-19 2009-09-24 Joseph Eugene Due Dust and debris evacuator for cut-off saw
EP2170545B1 (fr) * 2007-07-17 2011-04-13 Hitachi Koki CO., LTD. Dispositif de coupe portable

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080163492A1 (en) * 2005-02-18 2008-07-10 Mats Johansson Cutting and Dust Collecting Assembly and Working Machine with Such Assembly
EP2170545B1 (fr) * 2007-07-17 2011-04-13 Hitachi Koki CO., LTD. Dispositif de coupe portable
US20090236900A1 (en) * 2008-01-19 2009-09-24 Joseph Eugene Due Dust and debris evacuator for cut-off saw

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112638610A (zh) * 2018-10-01 2021-04-09 喜利得股份公司 用于岩芯钻机的提取装置
CN112638609A (zh) * 2018-10-01 2021-04-09 喜利得股份公司 用于岩芯钻机的提取装置
CN112638610B (zh) * 2018-10-01 2023-02-28 喜利得股份公司 用于岩芯钻机的提取装置
CN112638609B (zh) * 2018-10-01 2023-10-20 喜利得股份公司 用于岩芯钻机的提取装置
US12194583B2 (en) 2018-10-01 2025-01-14 Hilti Aktiengesellschaft Extraction device for a core drill
US12194547B2 (en) 2018-10-01 2025-01-14 Hilti Aktiengesellschaft Extraction device for a core drill
CN110725316A (zh) * 2019-09-20 2020-01-24 杨君成 一种用于圆柱切割的立式切桩机
US12420371B2 (en) 2021-11-30 2025-09-23 Eric Strahan Dust containment assembly

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