EP3416779A1 - Winkelschleifer-staubhaube - Google Patents
Winkelschleifer-staubhaubeInfo
- Publication number
- EP3416779A1 EP3416779A1 EP17704032.6A EP17704032A EP3416779A1 EP 3416779 A1 EP3416779 A1 EP 3416779A1 EP 17704032 A EP17704032 A EP 17704032A EP 3416779 A1 EP3416779 A1 EP 3416779A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- hood
- angle grinder
- spring
- hood body
- grinding wheel
- 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.)
- Granted
Links
- 239000000428 dust Substances 0.000 title claims abstract description 38
- 238000007789 sealing Methods 0.000 claims abstract description 25
- 229910000639 Spring steel Inorganic materials 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 2
- 229920001971 elastomer Polymers 0.000 description 3
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B55/00—Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
- B24B55/06—Dust extraction equipment on grinding or polishing machines
- B24B55/10—Dust extraction equipment on grinding or polishing machines specially designed for portable grinding machines, e.g. hand-guided
- B24B55/102—Dust extraction equipment on grinding or polishing machines specially designed for portable grinding machines, e.g. hand-guided with rotating tools
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B23/00—Portable grinding machines, e.g. hand-guided; Accessories therefor
- B24B23/02—Portable grinding machines, e.g. hand-guided; Accessories therefor with rotating grinding tools; Accessories therefor
- B24B23/028—Angle tools
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B55/00—Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
- B24B55/04—Protective covers for the grinding wheel
- B24B55/05—Protective covers for the grinding wheel specially designed for portable grinding machines
- B24B55/052—Protective covers for the grinding wheel specially designed for portable grinding machines with rotating tools
Definitions
- the present invention relates to an angle grinder dust hood with a hood body for covering a circular grinding wheel and with a sealing element extending along a circumference of the hood body for at least partially sealing the hood body with respect to a surface to be machined by the grinding wheel.
- the angle grinder dust hood has a suction connection, via which a surface removal can be sucked out of the hood body.
- the sealing element may be, for example, a brush curtain, slats or the like.
- the sealing element is a single single elastic element or several individual elastic elements.
- the elastic member may be a foam, an elastomer (e.g., rubber, rubber, etc.) or the like.
- Angle grinder dust hoods of the type mentioned are basically known from the prior art. They are used to prevent dust spreading during grinding work to protect the health of a user of the angle grinder. It is known to provide the hood body with a sealing element, for example a circumferential brush curtain or with a plurality of brushes, so that the hood body terminates on the surface to be machined of a workpiece. If the angle grinder is placed slightly obliquely on the surface of the workpiece to be machined, then the sealing element can compensate a gap which may arise between the hood body and the surface of the workpiece to be machined.
- a sealing element for example a circumferential brush curtain or with a plurality of brushes
- the object is achieved in that the sealing element in the hood body in the axial direction, based on the axis of rotation of the grinding wheel, is spring-loaded by at least one spring element.
- the invention includes the recognition that, in particular in an overhead operation of an angle grinder, a hood body with according to the prior art rigidly fixed thereto brush curtain by gravity and any of the suction connected suction hose is pulled down.
- a gap between the brush curtain and the surface to be processed arise.
- feathered in hood body brush curtain of the brush curtain is always pressed to the machined surface, whereby a gap is avoided or at least substantially reduced.
- the invention also includes the recognition that a worn brush curtain may typically have a high stiffness with respect to the axial direction, so that a lot of force has to be expended on the grinding wheel against the stiffness of the worn brush curtain on the surface of the brush to be machined To bring workpiece. This is because with angle grinder dust hoods of the prior art, as already mentioned, the brush curtain is rigidly attached to the hood body.
- the present invention includes the knowledge that an already heavily worn pad, in particular a diamond pot, is used in conjunction with a new angle grinder dust hood and the user disadvantageously against the relatively high stiffness of the still stiff brush curtain the new angle grinder dust hood already flattened sanding pad must press on the surface to be machined of the workpiece.
- a worn pad often has a lower height, i. a less concave shape than a new or unused sanding pad.
- the spring element takes over the axial movement of the sealing element with respect to the hood body. Any radial displacements can continue to be compensated by the sealing element itself.
- a spring element is a preferably discrete spring element and not merely a possible spring action or resilience of the brush curtain in the axial direction.
- the invention includes the recognition that angle grinder dust hoods of the prior art to achieve the spring action of the invention can not be developed such that a spring element is provided approximately between hood body and angle grinder housing. This would have in overhead work the disadvantage that the weight of a suction hose connected to the suction would compress such a spring in an undesirable manner.
- the hood body is designed to cover a major part of the grinding wheel.
- the angle grinder dust hood can a cover segment slidable in the circumferential direction of the hood body along the hood body, provided for gradually covering and leaving free a remaining portion of the grinding wheel as required. This allows a near-wall grinding operation by means of the remaining part of the grinding wheel, which is not covered by the hood body.
- a sealing element in the axial direction based on the axis of rotation of the grinding wheel, spring-mounted by at least one spring element.
- the spring element has a preferably flat base web.
- the spring element may be attached to the hood body and / or the hood segment.
- fastening takes place by means of a pin, a screw and / or a rivet.
- the spring element is mounted directly in the hood body by means of a spring clip via an undercut.
- the spring clip can also be referred to as a clip, so that the spring element is clipped into the hood body.
- the spring element can also be injected directly into the hood body or into the hood housing.
- the base web preferably at least one hole is provided, into which a pin, a screw or a rivet can engage.
- the spring element is attached to the first and / or second retaining rail for the sealing element.
- the spring element or the spring elements are arranged within a volume defined by the hood body or hood segment.
- the hood body and / or the hood segment has a housing section whose curvature corresponds to the curvature of the grinding wheel.
- the spring element is arranged in the immediate vicinity of this section.
- the spring element is arranged as far as possible from a rotation axis of the grinding wheel within the hood body volume or the hood segment volume.
- the spring element has at least one spring rocker protruding from the base web.
- the spring element is mounted such that the orientation of the projecting spring wings preferably corresponds approximately to the outer periphery of the hood body.
- the spring element is also arranged radially.
- the spring element has two spring wings projecting from the base web. In this way, a higher stability of the spring element in an assembled state and an increased spring force can be achieved.
- the spring wings When the spring element is mounted, the spring wings form a tangent to the circular grinding wheel or to the oval body of the grinding hood.
- the spring element has at least one retaining clip, which is designed to prevent an axial falling out of the brush curtain from the hood body and / or the hood segment.
- the headband can protrude in the axial direction of the base bar.
- an axial stop for a holding rail of the brush curtain is formed at its other end, that is, the base web remote end.
- the headband in the radial direction based on the axis of rotation of the grinding wheel, for the purpose of replacing the brush curtain deflected.
- the axial stop may be formed as a stop web, which preferably extends parallel to the base web.
- the axial stop formed as a stop web has a recess, so that a contact surface between stop web and brush curtain or holding rail of the brush curtain is reduced.
- the recess preferably requires a saving of material and a low surface for dust.
- a friction surface is reduced with respect to the brush curtain, so that it can be moved easily in the axial direction.
- the headband can protrude in the axial direction of the base web
- the headband may be formed as a clamping sleeve, which is arranged on a side facing away from the base web of a respective spring rocker.
- the clamping sleeve is designed for clamping a retaining rail of the brush curtain. In other words, the clamping sleeve, which holds the brush curtain, even sprung.
- the spring element is formed in one piece, preferably made of spring steel. Particularly preferably, the spring element in the axial direction on a spring stiffness, which is less than a stiffness of the brush curtain covered brushes. Alternatively, the spring element can also be designed in several parts.
- a plurality of spring elements along the circumference of the hood body and / or the hood segment is provided. It has proved to be advantageous if an angle grinder dust hood, the hood body and a Hood segment is equipped with five preferably evenly spaced spring elements.
- the hood body has a central opening through which a drive spindle, to which the circular grinding wheel is to be attached for grinding operation, can project through the central opening.
- a groove is preferably formed, so that the hood body can be fixed positively and thus fixed to the frame on an angle grinder.
- the object is also achieved by an angle grinder with an angle grinder dust hood of the type described above, wherein the hood body is fixed to the frame arranged on the angle grinder or can be arranged.
- FIG. 1 is a schematic bottom view of an angle grinder according to the invention
- Dust hood with a spring element according to a first alternative
- Fig. 2 is a sectional view of the embodiment of Fig. 1;
- FIG. 1 An angle grinder dust hood 100 according to the invention is shown in FIG. 1 in a bottom view.
- the angle grinder dust hood 100 has a hood body 10 for covering a circular grinding wheel, not shown here.
- An axis of rotation R of the grinding wheel is indicated by a dot-dash line.
- the angle grinder dust hood 100 also has a hood segment 20 which is displaceable along a circumferential direction U of the hood body 10 along the hood body 10.
- the hood body 10 is configured to cover a majority of the grinding wheel, with the sliding hood segment 20 being provided for covering and releasing a remaining portion of the grinding wheel.
- Both the hood body 10 and the sliding hood segment 20 have a sealing element 30 in the form of a brush curtain. Since the angle grinder dust hood 100 of FIG. 1 has both a hood body 10 and a hood segment 20, the brush curtain 30 is formed in two parts or two brush curtains are provided. The brush curtains 30 serve to seal the hood body 10 and the hood segment 20 to a surface to be machined, which is not shown here. A surface removal in the course of processing can be sucked off via a suction connection 40 provided on the hood body 10.
- the brush curtain 30 is spring-loaded with respect to the hood body 10 and the hood segment 20 in the axial direction, relative to the axis of rotation R of the grinding wheel, by a spring element 50.
- the spring element 50 is shown isolated on the left side of FIG.
- the spring element 50 has a flat base web 51, via which the spring element 50 is fastened to the hood body or hood segment 20.
- the spring element 50 is secured (e.g., hot-caulked) by a pin 52 (see Fig. 2), which pin engages a hole 52 '.
- the spring element 50 has two projecting from the base web 51 in opposite directions spring wings 53.
- the spring wings 53 exert a spring action on a retaining rail 31 of the brush curtain 30.
- the spring wings 53 are oriented with mounted spring element 50 in the direction of the outer circumference U of the hood body 10.
- the spring element 50 has a retaining clip 55, which is designed to prevent an axial falling out of the brush curtain 30 from the hood body 10 or the hood segment 20.
- the headband 55 protrudes in the axial Direction from the base bar 51 and has at its other end a stop for the retaining rail 31 of the brush curtain.
- the axial stop is presently designed as a stop web 57 which extends parallel to the base web 51 and has a recess 59.
- the retaining bracket 55 is deflectable in the radial direction, indicated by the double arrow, for the purpose of Auswechseins the brush curtain.
- the brush curtain 30 can be replaced without a tool is required.
- a functional integration is realized by the spring element 50, namely on the one hand the spring action in the axial direction according to the invention, and on the other hand the falling out of the brush curtain from the hood body 10 or the hood segment 20 is prevented.
- the hood body 10 has a central opening 11 through which a drive spindle, not shown here, to which the circular grinding wheel is to be attached, can project through the central opening 11.
- a groove 12 is formed, so that the hood body 10 can be fixed positively and thus fixed to a frame on an angle grinder.
- FIG. 2 now shows a sectional illustration of the exemplary embodiment of the angle grinder dust hood 100 from FIG. 1.
- the spring elements 50 arranged within a volume of the hood body 10 on the outer edge of the hood body 10 exert a spring action on the retaining rail 31 of the brush curtain 30 through their respective spring wings 53.
- the respective stop webs 57 form an axial stop for the retaining rail 31, so that it is securely held within the hood body 10.
- Fig. 3 shows a spring element 50 'according to a second alternative.
- the retaining clip 55 is designed as a clamping sleeve which is arranged on a side facing away from the base web 51 of a respective spring rocker 53.
- the retaining clips 55 designed as clamping sleeves serve for clamping the retaining rail 31 of the brush curtain 30 (compare FIG. 4).
- the spring element 50 shown in Fig. 3 is particularly suitable for, relative to the radial direction, comparatively narrow support rails.
- the retaining bracket 55 are formed as clamping sleeves, any manufacturing tolerances of the retaining rail are well compensated.
- FIG. 4 shows the spring element of FIG. 3 in a side view, with a brush curtain 30 with holding rail 31 above the holding clamp 55 designed as a clamping sleeve is shown, which is in the concept (indicated by the arrow), to be clamped in the clamp designed as a clamping bracket 55.
- two holes 52, 52 ' are provided to fasten the element 50 in the same manner as in FIGS. 1 and 2 by means of then two pins 52 on the hood body 10 and on the hood segment 20.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Grinding-Machine Dressing And Accessory Apparatuses (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP16156030.5A EP3208039A1 (de) | 2016-02-17 | 2016-02-17 | Winkelschleifer-staubhaube |
PCT/EP2017/053244 WO2017140657A1 (de) | 2016-02-17 | 2017-02-14 | Winkelschleifer-staubhaube |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3416779A1 true EP3416779A1 (de) | 2018-12-26 |
EP3416779B1 EP3416779B1 (de) | 2019-10-09 |
Family
ID=55361407
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP16156030.5A Withdrawn EP3208039A1 (de) | 2016-02-17 | 2016-02-17 | Winkelschleifer-staubhaube |
EP17704032.6A Active EP3416779B1 (de) | 2016-02-17 | 2017-02-14 | Winkelschleifer-staubhaube |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP16156030.5A Withdrawn EP3208039A1 (de) | 2016-02-17 | 2016-02-17 | Winkelschleifer-staubhaube |
Country Status (4)
Country | Link |
---|---|
US (1) | US20190015948A1 (de) |
EP (2) | EP3208039A1 (de) |
CN (1) | CN108698199B (de) |
WO (1) | WO2017140657A1 (de) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3812089A1 (de) | 2019-10-23 | 2021-04-28 | Black & Decker Inc. | Stabschleifmaschine |
US11867224B2 (en) | 2021-01-27 | 2024-01-09 | Black & Decker Inc. | Locking mechanism for two telescoping poles of a power tool |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3034493A (en) * | 1959-07-24 | 1962-05-15 | Charles R Bandy | Suction sawdust collector |
US7223161B2 (en) * | 2004-06-29 | 2007-05-29 | Goei Co., Ltd. | Cutting apparatus with dust discharging |
EP2089185B1 (de) * | 2006-09-12 | 2016-10-26 | Black & Decker, Inc. | Schleifwerkzeug mit schwenkbar gekoppelter kopfanordnung |
DE102008046947A1 (de) * | 2008-09-12 | 2010-03-18 | Protool Gmbh | Hand-Werkzeugmaschine mit einer Abdeckhaube und einem Staubabfuhranschluss |
EP2186600B1 (de) * | 2008-11-12 | 2011-11-02 | Collomix Rühr-und Mischgeräte GmbH | Oberflächenschleifer, insbesondere Betonschleifer |
DE102008064564A1 (de) * | 2008-12-23 | 2010-06-24 | Flex-Elektrowerkzeuge Gmbh | Werkzeughaltekopf für eine handgehaltene Reinigungs-/Schleifmaschine und handgehaltene Reinigungs-/Schleifmaschine |
US9221110B2 (en) * | 2009-10-02 | 2015-12-29 | JPL Global, LLC | Power saw apparatus with integrated dust collector |
JP5696488B2 (ja) * | 2011-01-19 | 2015-04-08 | 日立工機株式会社 | 研削用集塵カバー及び動力工具 |
CN102601712A (zh) * | 2011-01-19 | 2012-07-25 | 日立工机株式会社 | 集尘适配器与包括集尘适配器的电动工具 |
JP5765017B2 (ja) * | 2011-03-31 | 2015-08-19 | 日立工機株式会社 | 集塵カバー及び集塵カバーを備えたディスクグラインダ |
JP2012171064A (ja) * | 2011-02-23 | 2012-09-10 | Hitachi Koki Co Ltd | 研削用集塵カバー及び動力工具 |
DE102011076627A1 (de) * | 2011-05-27 | 2012-11-29 | Robert Bosch Gmbh | Motorgetriebenes Handschleifgerät |
-
2016
- 2016-02-17 EP EP16156030.5A patent/EP3208039A1/de not_active Withdrawn
-
2017
- 2017-02-14 US US16/076,806 patent/US20190015948A1/en not_active Abandoned
- 2017-02-14 CN CN201780011428.8A patent/CN108698199B/zh active Active
- 2017-02-14 WO PCT/EP2017/053244 patent/WO2017140657A1/de active Application Filing
- 2017-02-14 EP EP17704032.6A patent/EP3416779B1/de active Active
Also Published As
Publication number | Publication date |
---|---|
WO2017140657A1 (de) | 2017-08-24 |
CN108698199B (zh) | 2020-06-09 |
CN108698199A (zh) | 2018-10-23 |
US20190015948A1 (en) | 2019-01-17 |
EP3416779B1 (de) | 2019-10-09 |
EP3208039A1 (de) | 2017-08-23 |
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