EP2117776A1 - Eccentric grinder - Google Patents
Eccentric grinderInfo
- Publication number
- EP2117776A1 EP2117776A1 EP07822050A EP07822050A EP2117776A1 EP 2117776 A1 EP2117776 A1 EP 2117776A1 EP 07822050 A EP07822050 A EP 07822050A EP 07822050 A EP07822050 A EP 07822050A EP 2117776 A1 EP2117776 A1 EP 2117776A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- friction surface
- friction
- sanding pad
- sanding
- orbital sander
- 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
- 239000000463 material Substances 0.000 claims description 5
- 239000004952 Polyamide Substances 0.000 claims description 3
- 239000004743 Polypropylene Substances 0.000 claims description 3
- 229920003229 poly(methyl methacrylate) Polymers 0.000 claims description 3
- 229920002647 polyamide Polymers 0.000 claims description 3
- 239000004926 polymethyl methacrylate Substances 0.000 claims description 3
- 229920001155 polypropylene Polymers 0.000 claims description 3
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 2
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 2
- 239000006261 foam material Substances 0.000 claims description 2
- 229910052749 magnesium Inorganic materials 0.000 claims description 2
- 239000011777 magnesium Substances 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- 239000004033 plastic Substances 0.000 claims description 2
- 229920003023 plastic Polymers 0.000 claims description 2
- 239000004417 polycarbonate Substances 0.000 claims description 2
- 229920000515 polycarbonate Polymers 0.000 claims description 2
- -1 polypropylene Polymers 0.000 claims description 2
- 239000000428 dust Substances 0.000 description 5
- 230000033001 locomotion Effects 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 229920002943 EPDM rubber Polymers 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 238000005096 rolling 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
- 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
- B24B23/03—Portable grinding machines, e.g. hand-guided; Accessories therefor with rotating grinding tools; Accessories therefor the tool being driven in a combined movement
Definitions
- the invention relates to an eccentric grinder according to the preamble of claim 1.
- an eccentric grinder which has an electric drive motor in a housing, the drive shaft via an eccentric bearing drives a support shaft of a sanding pad, on the underside of an abrasive is to be attached.
- a superimposed circular and rotary working movement of the sanding pad including the abrasive thereon is achieved.
- the working position of the grinding plate is pressed with the abrasive against the surface of the workpiece to be machined, due to the storage of the support shaft to the drive shaft rotation of the grinding plate about its own axis is only possible to a limited extent.
- there is the risk that the sanding disc will start to rotate due to the bearing friction with the speed of the drive shaft at idle the eccentric grinder, so when lifting the sanding pad of the workpiece to be machined.
- a friction brake In order to limit the self-rotation of the sanding plate at idle, a friction brake is provided which has cooperating friction on the sanding pad and on the sanding pad facing bottom of the housing of the eccentric grinder.
- the friction brake can idle of the eccentric grinder an outer Wälzkranz on the sanding pad on an inner, associated Wälzkranz run on the housing a rolling motion, whereby a self-rotation of the sanding pad is not prevented, however, the speed of the sanding pad against the engine speed on the division of outer and inner ring gear can be reduced , A complete inhibition of self-rotation is not provided in this embodiment.
- the invention has for its object to form a generic eccentric grinder in such a way that at the least possible wear of the friction brake, the self-rotation of the grinding plate is prevented during idling of the eccentric grinder.
- the eccentric grinder according to the invention has a drive in a housing, usually an electric drive, wherein in the context of the invention, a hydraulic or pneumatic drive is considered, drives the drive shaft via an eccentric bearing a support shaft of a sanding pad.
- an abrasive can be attached, for example, an abrasive paper, which is placed on the surface of a workpiece for machining. Due to the storage of the
- Sanding plate bearing support shaft in the drive shaft is forcibly transmitted to the sanding disc an eccentric movement.
- a self-rotation of the sanding pad which is fundamentally made possible by the bearing of the support shaft, is only possible to a limited extent in the grinding operation due to the grinding forces acting on the sanding pad.
- a Reibbrems is provided which prevents the self-rotation of the grinding disc at idle or at least decelerates.
- This friction brake device comprises on the one hand
- Reibbremselement which is arranged on the housing of the eccentric grinder, and on the other an associated friction surface on the sanding pad, which of the Reibbremselement with a
- Frictional force is applied.
- the friction surface of the sanding pad has, relative to a horizontal plane perpendicular to the axis of the support shaft, a course sloping from the inside to the outside in the radial direction. This means that the housing facing the friction surface on the sanding pad with respect to the
- Sanding plate which is currently deflected eccentrically, is acted upon by the friction element to a greater extent than the diametrically opposite side of the sanding pad, since due to the rising towards the center of the sanding pad gradient of the friction surface, the friction brake on the deflected side has a smaller distance to Reibbremselement and therefore more or stronger comes in frictional contact than on the opposite side.
- the self-rotation of the grinding disc is effectively inhibited, since the friction element on the eccentrically deflected side a
- a stabilizing effect is achieved, which is due to the fact that the friction element pushes the sanding pad on the eccentrically deflected side slightly downwards, whereby the sanding pad is returned to its normal working position with a parallel axis of the support shaft to the drive shaft.
- the friction surface on the sanding pad can, in principle, have any desired cross-sectional geometry, as long as it is ensured that the friction surface falls to the outer edge of the sanding pad.
- the friction surface is conical and has a cone angle of at least 5 °, which can be structurally particularly easy to implement.
- a non-conical course is possible, in particular a course with varying slope seen in the radial direction of the grinding plate, relative to the horizontal plane perpendicular to the axis of rotation of the grinding plate.
- both a mathematically strictly monotonic decreasing as well as only a monotonically decreasing course of the friction surface comes into consideration, ie a course with falling and horizontal sections.
- the friction brake element is expediently designed as a friction ring, which advantageously has a constant cross section in the circumferential direction.
- This compensation section which is formed for example in cross-section V-shaped, allows in the direction of the friction brake force to be transmitted in Reibbremselement an elastically resilient behavior, which also Fluctuations of the sanding plate during the circulation can be compensated.
- the friction surface may be designed according to an advantageous embodiment as a separately formed contact member which is connected to the sanding pad.
- the design as a separate component has the advantage that the friction surface may consist of a different material than the sanding pad. Suitable materials for the friction surface are various plastics, for example polyamide, polypropylene, polycarbonate or PMMA. Alternatively, the friction surface may also be made of metal, in particular of aluminum or magnesium, or of a foam material.
- FIG. 1 shows a section through an eccentric grinder, the grinding disc is driven eccentrically, wherein the housing of the eccentric grinder facing side of the sanding pad has a friction surface against which a Reibbremselement, and the friction surface has a tapered edge towards the edge,
- the eccentric grinder 1 shown in Fig. 1 in an enclosure 2, an electric drive motor 3, which is supplied via a power supply 4 with electric current.
- an electric drive motor 3 On a drive shaft 5 of the drive motor 3 is an eccentric arranged bearing a support shaft 7 mounted, which carries a sanding pad 8, on the underside 9, an abrasive for machining the surface of a workpiece is to be attached.
- the bearing 6 is formed, for example, as a ball bearing and allows a self-rotation of the support shaft 7 to the
- Rotation axis 11 which also represents the rotation or rotation axis of the grinding plate 8. This axis of rotation 11 is located with eccentric distance e parallel to the axis of rotation 10 of the drive shaft fifth
- the dust blower 13 is fixedly connected to the drive shaft 5 of the drive motor and having an eccentrically shaped, cup-shaped interior, in which the bearing 6 is accommodated for supporting the support shaft 7.
- the transported through the holes 12 grinding dust is passed through a housing-side exhaust nozzle 14 in a dust collector, not shown.
- This friction brake device 15 comprises a friction surface 16 on the sanding pad on the top side associated with the housing 2 and a friction brake element 17, which is firmly connected to the housing 2 and comes into frictional contact with the friction surface 16.
- the friction brake element 17 is expediently designed as a friction ring and consists of rubber or an elastomer material, for example TPE, EPDM or NBR.
- the friction ring 17 has an approximately V-shaped compensation section 18, which allows in the direction of Reibkraftbeetzleyung an elastic elongation and contraction of the friction ring.
- the friction surface 16 on the upper side of the sanding disk 8 has a sloping cross-sectional profile viewed radially from the inside outward, that is to say seen from the axis of rotation 11 in the direction of the radially outer edge 19 of the sanding disk. This sloping course relates to a horizontal plane 20, which is perpendicular to the axis of rotation 11 of the sanding pad 8.
- the grinding disc 8 When the eccentric grinder is idling, the grinding disc 8 can be tilted slightly out of its position with parallel axes of rotation due to bearing play and the eccentric drive, so that the axis of rotation 11 of the grinding disc is slightly inclined with respect to the axis of rotation 10 of the drive shaft 5.
- the currently eccentrically deflected side of the sanding pad is raised by a small amount, whereby the friction surface comes into contact with the Reibbremselement 17 at this point and learns from this a frictional force that slows down the self-rotation of the sanding pad 8.
- the friction brake element 17 presses the slightly raised sanding pad back down into a position with a parallel axis of rotation to the axis of rotation 10 of the drive shaft.
- the cone angle ⁇ can be seen below which the conical section of the friction surface 16 is inclined relative to the horizontal plane or a plane parallel thereto.
- the conical portion of the friction surface 16 is limited to a relatively radially outer region. It is essential that the friction surface over its entire radial Extending seen starting from the axis of rotation 11 in the radial direction outwards has a sloping course.
- the friction surface 16 is part of a contact component 21, which is formed separately from the sanding pad 8, but is connected thereto and forms the upper side of the sanding pad facing the housing 2. This opens up the possibility of producing the friction surface 16 from a different material than the sanding pad 8.
- the friction surface 16 does not extend as far as the outer edge 19 of the sanding pad 8, but is set back from the outer edge 19 in the radial direction. This is basically sufficient to ensure that the friction brake element acts on the sanding pad in the eccentrically deflected position with a frictional force.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
- Braking Arrangements (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102006061634A DE102006061634A1 (en) | 2006-12-27 | 2006-12-27 | Eccentric grinder, has friction brake device with friction surface that stands perpendicularly to rotation axis of grinding disk that exhibits course, which is sloping outwards from inner side in radial direction |
PCT/EP2007/061696 WO2008080665A1 (en) | 2006-12-27 | 2007-10-30 | Eccentric grinder |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2117776A1 true EP2117776A1 (en) | 2009-11-18 |
EP2117776B1 EP2117776B1 (en) | 2011-12-14 |
Family
ID=38912639
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07822050A Active EP2117776B1 (en) | 2006-12-27 | 2007-10-30 | Eccentric grinder |
Country Status (7)
Country | Link |
---|---|
US (1) | US8105132B2 (en) |
EP (1) | EP2117776B1 (en) |
CN (1) | CN101568407B (en) |
AT (1) | ATE536959T1 (en) |
DE (1) | DE102006061634A1 (en) |
RU (1) | RU2464151C2 (en) |
WO (1) | WO2008080665A1 (en) |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102006061634A1 (en) * | 2006-12-27 | 2008-07-03 | Robert Bosch Gmbh | Eccentric grinder, has friction brake device with friction surface that stands perpendicularly to rotation axis of grinding disk that exhibits course, which is sloping outwards from inner side in radial direction |
EP2700473B1 (en) * | 2011-10-26 | 2018-12-19 | Keitech Co., Ltd. | Grinding tool with eccentric rotation shaft |
CN103862367A (en) * | 2012-12-07 | 2014-06-18 | 郑明达 | Eccentric base for automotive grinding machine |
JP6529210B2 (en) | 2013-04-04 | 2019-06-12 | スリーエム イノベイティブ プロパティズ カンパニー | Polishing method using polishing disk and article used therefor |
US9387578B2 (en) * | 2013-10-28 | 2016-07-12 | Black & Decker Inc. | Handle arrangement for sander |
CN104589189B (en) * | 2015-02-02 | 2017-07-14 | 浙江金美电动工具有限公司 | Dual trace eccentric structure polishing machine |
US20180009084A1 (en) * | 2016-07-07 | 2018-01-11 | Stone Pro Equipment Company | Abrading Disc |
US10632589B2 (en) | 2016-08-29 | 2020-04-28 | Black & Decker Inc. | Power tool |
CN107225477A (en) * | 2017-06-06 | 2017-10-03 | 浙江亚特电器有限公司 | A kind of circle sand machine using safety |
CN110860999A (en) * | 2018-08-28 | 2020-03-06 | 中核苏阀科技实业股份有限公司 | Double-eccentric bearing automatic 8-shaped plane grinding device for large-caliber gate valve flashboard |
Family Cites Families (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1779682A (en) * | 1928-11-16 | 1930-10-28 | Stratmore Company | Surfacing apparatus |
DE3906549A1 (en) | 1989-03-02 | 1990-09-06 | Bosch Gmbh Robert | Eccentric grinder |
US5018314A (en) * | 1989-06-08 | 1991-05-28 | Makita Electric Works, Ltd. | Sander |
US5237781A (en) * | 1992-03-23 | 1993-08-24 | Kris Demetrius | Hand held disc type surfacing machine |
DE4233729A1 (en) * | 1992-10-07 | 1994-04-14 | Bosch Gmbh Robert | Eccentric disc grinder with grinding disc brake |
GB9423848D0 (en) * | 1994-11-25 | 1995-01-11 | Black & Decker Inc | Improved oscillating hand tool |
US6059644A (en) * | 1998-11-18 | 2000-05-09 | 3M Innovative Properties Company | Back-up pad for abrasive articles and method of making |
DE19941620A1 (en) * | 1999-09-01 | 2001-03-08 | Bosch Gmbh Robert | Hand tool |
DE19952108B4 (en) * | 1999-10-29 | 2007-09-20 | Robert Bosch Gmbh | Exzentertellerschleifmaschine |
GB2376651B (en) * | 2000-03-14 | 2003-05-14 | Bosch Gmbh Robert | Hand-held electric sanding machine,in particular eccentric sander |
DE20023967U1 (en) * | 2000-03-14 | 2008-02-28 | Robert Bosch Gmbh | Electric hand grinder, in particular eccentric grinder |
DE10031761A1 (en) | 2000-06-29 | 2002-01-10 | Bosch Gmbh Robert | Eccentric plate grinding machine has cylindrical housing, braking arrangement with through openings exposed and closed by valve-like flaps for ventilating suction chamber |
DE10126675A1 (en) * | 2001-06-01 | 2002-12-05 | Bosch Gmbh Robert | Electric hand-held grinder machine has support on underside of grinder plate, rim-guard, elastic bar, and axial arm |
DE10148339A1 (en) * | 2001-09-29 | 2003-04-10 | Bosch Gmbh Robert | Manual grinder with support and intermediate plates joins these nontwistably without axial play by spring to give catches and slots with grinding cushion releasably fixed to plate underside. |
TWM256252U (en) * | 2004-03-09 | 2005-02-01 | Ren-Ben Jang | Improved structure of polishing plate |
US7357701B2 (en) * | 2005-04-07 | 2008-04-15 | Dan Gautier | Water driven rotary tool |
DE102006061634A1 (en) * | 2006-12-27 | 2008-07-03 | Robert Bosch Gmbh | Eccentric grinder, has friction brake device with friction surface that stands perpendicularly to rotation axis of grinding disk that exhibits course, which is sloping outwards from inner side in radial direction |
-
2006
- 2006-12-27 DE DE102006061634A patent/DE102006061634A1/en not_active Withdrawn
-
2007
- 2007-10-30 EP EP07822050A patent/EP2117776B1/en active Active
- 2007-10-30 AT AT07822050T patent/ATE536959T1/en active
- 2007-10-30 US US12/298,381 patent/US8105132B2/en active Active
- 2007-10-30 RU RU2009128745/02A patent/RU2464151C2/en not_active IP Right Cessation
- 2007-10-30 CN CN2007800483950A patent/CN101568407B/en active Active
- 2007-10-30 WO PCT/EP2007/061696 patent/WO2008080665A1/en active Application Filing
Non-Patent Citations (1)
Title |
---|
See references of WO2008080665A1 * |
Also Published As
Publication number | Publication date |
---|---|
CN101568407A (en) | 2009-10-28 |
RU2009128745A (en) | 2011-02-10 |
RU2464151C2 (en) | 2012-10-20 |
US8105132B2 (en) | 2012-01-31 |
EP2117776B1 (en) | 2011-12-14 |
US20100062695A1 (en) | 2010-03-11 |
ATE536959T1 (en) | 2011-12-15 |
CN101568407B (en) | 2013-02-06 |
DE102006061634A1 (en) | 2008-07-03 |
WO2008080665A1 (en) | 2008-07-10 |
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