EP2049303A1 - Portable sander having novel abrasive sheet tensile stress - Google Patents
Portable sander having novel abrasive sheet tensile stressInfo
- Publication number
- EP2049303A1 EP2049303A1 EP07787421A EP07787421A EP2049303A1 EP 2049303 A1 EP2049303 A1 EP 2049303A1 EP 07787421 A EP07787421 A EP 07787421A EP 07787421 A EP07787421 A EP 07787421A EP 2049303 A1 EP2049303 A1 EP 2049303A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- abrasive sheet
- clamping
- clamping means
- sheet carrier
- hand tool
- 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
- 239000012858 resilient material Substances 0.000 claims description 4
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D15/00—Hand tools or other devices for non-rotary grinding, polishing, or stropping
- B24D15/02—Hand tools or other devices for non-rotary grinding, polishing, or stropping rigid; with rigidly-supported operative surface
- B24D15/023—Hand tools or other devices for non-rotary grinding, polishing, or stropping rigid; with rigidly-supported operative surface using in exchangeable arrangement a layer of flexible material
-
- 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
- B24B23/04—Portable grinding machines, e.g. hand-guided; Accessories therefor with oscillating grinding tools; Accessories therefor
Definitions
- the abrasive carrier which is usually designed as an abrasive sheet (in a orbital sander usually as a rectangular abrasive sheet) to be fixed in a suitable manner on a Abrasive sheet to in the abrasion causing, usually elliptical or circular movements of the abrasive sheet carrier not slip off of this or make an undesirable relative movement to this.
- a whole series of clamping devices are known for this purpose.
- sanding sheets are used with a back Velcro coating, which adhere to a specially equipped abrasive sheet carrier by the effects of a hook and loop fastener.
- clamp or pinch roller systems are known in which the abrasive sheet is clamped at a front and rear side of the abrasive sheet carrier and stretched over the outer edges.
- clamping levers are formed on at least one narrow side of the abrasive sheet carrier, and where in addition to the clamp a spring stopper is provided, wherein the abrasive sheet inserted between clamp and spring stopper and be tensioned by a movement of the clamp or its clamping lever both the clamp and the spring stopper with the paper clamped therein.
- the clamping lever is fixed in an end position and gives the final paper tension on the abrasive sheet carrier.
- a tensioning system is known for example from DE 102 32 055, which is regarded as the closest prior art.
- the clamping elements must be relatively strong in order to transmit the high clamping forces, which leads to a higher weight on one side.
- the center of gravity of the abrasive sheet carrier and the components mounted thereon shifts out of the center (the region of the swing axis) resulting in higher vibrations which in turn induce vibrations into the system and result in both increased wear and deterioration of the work result.
- the object of the invention is to provide a grinding hand tool machine which has a clamping system which avoids the disadvantages mentioned.
- an abrasive hand tool in particular an orbital sander is proposed, with an abrasive sheet carrier and with clamping means for clamping opposite abrasive sheet ends of a supportable on the abrasive sheet carrier abrasive sheet, said first clamping means together with a clamped sheet end of the other, by means of second
- Clamping means clamped abrasive sheet ends are moved away for tensioning the abrasive sheet and the first clamping means have spring elasticity. It is provided here that the first clamping means in a Spannendposition with bias against a rigid stop element. Unlike in the prior art, therefore, the first clamping means are held in their Spannendposition not only on the one hand by the tensile force of the tensioned abrasive sheet and on the other hand by the spring tension of the first clamping means in force equilibrium. Rather, the stop element is added, which ensures the first clamping means a defined Spannendposition and in particular a stable position with power dissipation, whereby a free swinging of the first clamping means no longer occurs during operation of the grinding hand tool. It is hereby assumed in each case that the abrasive sheet is first fixed in the second clamping means (which may be formed in the usual way); the final tension of the abrasive sheet is always effected with the first clamping means.
- the stop element is integral with the abrasive sheet carrier is formed or formed as a separate part to the abrasive sheet carrier and is rigidly connected to the abrasive sheet carrier.
- the stop element is structurally an integrally executed part of the abrasive sheet carrier, for example by forming at least one nose or a support on the first clamping means associated end of the abrasive sheet carrier.
- the stop element is indeed a separate component, but this is rigidly connected to the abrasive sheet carrier, for example screwed. Essential to the invention here is that the stop element performs no relative movement to the abrasive sheet carrier, but is firmly connected to this.
- the stop element is adjustable, in particular angle-adjustable, relative to the abrasive sheet carrier.
- the stop element can assume different positions relative to the abrasive sheet carrier, but in which it is firmly connected to the abrasive sheet carrier or can be connected.
- the stop element is rotatably mounted on the abrasive sheet carrier, in its desired end position, however, can be fixed by suitable devices (for example, screwed or snapped).
- the first clamping means and / or the second clamping means at least partially and / or in parts and / or in partial areas elastically deformable gripping aids, in particular rubber.
- the first clamping means are made of metal or other elastic materials. As such, they naturally have rather smooth surfaces, so that in unfavorable cases, the abrasive sheet can perform a relative movement to them and can slip out in very unfavorable cases.
- the elasticity of the first clamping means becomes at least in partial areas applied or mounted deformable gripping aids that hold the abrasive sheet safely by means of their elastic deformation or adhesiveness.
- these gripping aids made of rubber, wherein the rubber can be wound up as rolls, vulcanized or brushed or applied in any other suitable form.
- the first clamping means are designed as clamps and clamping plate.
- the clamping bracket and the clamping plate are in this case arranged so that they occupy a substantially opposite, with the abrasive sheet is placed between them.
- the abrasive sheet is clamped between them and tensioned by a further movement of the clamp.
- the clamping plate is rotatably mounted relative to the abrasive sheet carrier about a transverse axis.
- the clamping plate can therefore perform a pivoting movement relative to the abrasive sheet carrier.
- the clamping plate is spring-loaded. For example, by a
- the clamping plate can be provided with a relatively high bias, so that the final clamping the gripping blade resulting clamping force is not applied relative to the abrasive sheet carrier, but between clamping plate and clamp. In this way, a considerable relief of the abrasive sheet carrier of clamping forces is possible, so that it does not have to be performed in an unnecessarily heavy and stable design, only to avoid distortions generated by clamping forces and their opposing forces.
- the clamping plate consists of resilient material or has a resilient material. The clamping plate can thus in turn cause the bias and ultimately clamping the clamping sheet between clamping plate and clamp.
- the clamping bracket is rotatably mounted about a transverse axis of the abrasive sheet carrier and having a clamping lever.
- FIG. 1 shows an abrasive sheet carrier with a first clamping means in the opened state
- FIG. 2 shows the first clamping means when the abrasive sheet is inserted
- Figure 3 shows the first clamping means when clamping the abrasive sheet
- FIG. 1 shows an abrasive sheet carrier 1 of an abrasive hand tool, not shown, namely an orbital sander.
- first clamping means 3 are arranged, namely a clamping bracket 4, which is mounted in bearings 5, which are arranged on an upper side 6 of the abrasive sheet carrier 1, and is continued in a clamping lever 7, and a clamping plate 8, in extension of the Top side 6 of the abrasive sheet carrier 1 above the clamping bracket 4, namely in particular above a clamping portion 28 of the clamping bracket 4, is arranged.
- a stop element 9 is arranged in the form of a substantially flat-shaped bracket 10, wherein the plane of the bracket 10 is angled by a few degrees from the plane of the top 6 of the abrasive sheet carrier 1.
- a rotary leg spring 13 is arranged, which is supported on the one hand on a region 14 of the upper side 6 of the abrasive sheet carrier 1, and on the other hand on a clamping plate top 15. In this way, the clamping plate 8 is spring-loaded, so that it can only be moved against this spring tension in the direction of the stop element 9.
- the clamping plate 8 has at a first outer end 16 and at a second outer end 17 each continuations 18, which are at least on one of the clamping bracket 4 facing bottom 19 with an elastic coating 20, for example, with rubber occupied.
- the clamping bracket 4 is bow-shaped so that it rotates when turning the clamping lever 8 in the direction of the top 6 of the abrasive sheet carrier 1 out in the bearings 5 at least so far that he in contact with the clamping plate 8, preferably with the continuations 18 of Clamping plates 8 is coming.
- Figure 2 shows a side view of the same first clamping means 3 on the abrasive sheet carrier 1 in the open state.
- Abrasive sheet carrier 1 is shown for clarity an abrasive sheet 21 loosely before clamping in the first clamping means 3, wherein the front end 22 protrudes beyond the abrasive sheet carrier 1 in the region of the first clamping means 3 into it. It is assumed that the abrasive sheet on the opposite second clamping means, which are not shown here, is already fixed tensile strength. In this side view, the formation of the clamp 4 is very clearly visible.
- the bail arm 23 has at its bearing remote end 24 a return bend 25 in the form of a wide open U on.
- a clamping support arm 26 is formed, which merges at its end 27 facing away from the return bend 25 into the clamping region 28, which is not visible here and runs essentially parallel to the first longitudinal side 2 of the abrasive sheet carrier 1.
- elastic rollers 29 (for example made of rubber) are arranged, which in contrast to the formed in the extension of the abrasive sheet carrier 1 clamping plate 8 and there in particular to its continuations 18, which have the elastic covering 20 on the bottom 19.
- the clamping lever 7 is formed, which serves for pivoting / rotation of the clamping clip 4 in the bearing points 5.
- the clamping portion 28 of the clamp 4 is displaced in the direction of the continuations 18 of the clamping plate 8 out.
- the grinding sheet 21 located between the clamping region 28 and the clamping plate 8 is gripped and fixed on the upper side by the elastic supports 29 on the underside and by the elastic covering 20 of the continuations 18.
- FIG. 3 shows how the abrasive sheet 21 is gripped and fixed with its front end 22 between the clamping region 28, namely in particular its elastic supports 29 and the elastic covering 20 of the continuations 18 of the clamping plate 8.
- the elastic pads 29 and the elastic pads 20 thus act as gripping aids 30, which cause an at least provisional fixation of the abrasive sheet 21 already in the course of the tensioning process.
- FIG. 4 shows the same arrangement of abrasive sheet carrier 1 and first clamping means 3 in the exciting end position.
- the clamping lever 7 is hereby displaced in its end position substantially parallel to the upper side 6 of the abrasive sheet carrier 1 and is there approximately by a
- Arretiernase 31 held.
- the abrasive sheet 21 has, moved by the gripping aids 30 of the clamping portion 28 and the continuations 18 relative to the first longitudinal end 2 of the abrasive sheet carrier 1 moved away and thus tensioned.
- the clamping plate 8 which is rotatably mounted for this purpose in a rotation axis 32, against the spring load by the torsion spring 13 together with the clamping bracket 4 by its upward movement on lowering the clamping lever 7 has been moved in the direction of the stop element 9 until this movement the stop of the continuations 18 on a stop element underside 33 of the
- Stop element 9 was mechanically limited. In order to vary the degree of tension, the stop element 9 can be designed to be angularly adjustable relative to the abrasive sheet carrier 1, so that the tension end position (striking of the continuations 18 on the stop element underside 33) can be adjusted.
- the tension end position (striking of the continuations 18 on the stop element underside 33) can be adjusted.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
- Polishing Bodies And Polishing Tools (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102006035977A DE102006035977A1 (en) | 2006-08-02 | 2006-08-02 | Grinding hand tool with new grinding blade tension |
PCT/EP2007/057150 WO2008015087A1 (en) | 2006-08-02 | 2007-07-12 | Portable sander having novel abrasive sheet tensile stress |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2049303A1 true EP2049303A1 (en) | 2009-04-22 |
EP2049303B1 EP2049303B1 (en) | 2013-04-17 |
Family
ID=38515516
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07787421.2A Ceased EP2049303B1 (en) | 2006-08-02 | 2007-07-12 | Portable sander having novel abrasive sheet tensile stress |
Country Status (6)
Country | Link |
---|---|
US (1) | US8025558B2 (en) |
EP (1) | EP2049303B1 (en) |
CN (1) | CN101495270B (en) |
DE (1) | DE102006035977A1 (en) |
RU (1) | RU2440882C2 (en) |
WO (1) | WO2008015087A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5275854B2 (en) * | 2009-03-10 | 2013-08-28 | 株式会社マキタ | Sanda |
CN201493733U (en) * | 2009-08-03 | 2010-06-02 | 南京德朔实业有限公司 | Sanding machine |
JP2016132044A (en) * | 2015-01-16 | 2016-07-25 | リョービ株式会社 | Sander |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2715804A (en) * | 1953-11-25 | 1955-08-23 | David R Wickes | Sanding machine |
US3540161A (en) | 1966-05-25 | 1970-11-17 | Wen Products Inc | Vibratory tool |
US3546822A (en) * | 1968-11-29 | 1970-12-15 | Alma A Hutchins | Clip for surface treating tool |
US4077165A (en) * | 1976-11-26 | 1978-03-07 | Hutchins Alma A | Abrading tool clip with automatic take-up |
US4330964A (en) * | 1980-04-14 | 1982-05-25 | Evidio Martinez | Sanding device |
JPS6161761A (en) * | 1984-08-29 | 1986-03-29 | Makita Denki Seisakusho:Kk | Cordless polishing machine |
JPH0215256U (en) * | 1988-07-01 | 1990-01-30 | ||
US5616072A (en) * | 1990-11-23 | 1997-04-01 | Robert Bosch Gmbh | Device for clamping sandpaper on a vibrating sander |
DE10139547A1 (en) * | 2001-08-10 | 2003-02-20 | Bosch Gmbh Robert | Grinding tool machine has clamps on opposite ends of grinding disc, holder, pincers with clamping jaws and swivel axle |
DE10139546A1 (en) * | 2001-08-10 | 2003-02-20 | Bosch Gmbh Robert | Grinding tool machine has plate-type holder, clamps as lever with clamping jaw, swivel axle |
DE10232055A1 (en) * | 2002-07-16 | 2004-02-05 | Robert Bosch Gmbh | Mechanical grinding machine, especially vibrating grinder, has housing, grinding disc holder, clamps as tongs and jaws moving on axle |
DE10323640A1 (en) * | 2003-05-26 | 2004-12-16 | Robert Bosch Gmbh | Sander machine |
DE10353682A1 (en) | 2003-11-17 | 2005-06-16 | Robert Bosch Gmbh | Hand sanding tool |
-
2006
- 2006-08-02 DE DE102006035977A patent/DE102006035977A1/en not_active Withdrawn
-
2007
- 2007-07-12 US US12/089,489 patent/US8025558B2/en not_active Expired - Fee Related
- 2007-07-12 CN CN2007800288040A patent/CN101495270B/en not_active Expired - Fee Related
- 2007-07-12 RU RU2009106954/02A patent/RU2440882C2/en not_active IP Right Cessation
- 2007-07-12 EP EP07787421.2A patent/EP2049303B1/en not_active Ceased
- 2007-07-12 WO PCT/EP2007/057150 patent/WO2008015087A1/en active Application Filing
Non-Patent Citations (1)
Title |
---|
See references of WO2008015087A1 * |
Also Published As
Publication number | Publication date |
---|---|
US8025558B2 (en) | 2011-09-27 |
WO2008015087A1 (en) | 2008-02-07 |
RU2440882C2 (en) | 2012-01-27 |
RU2009106954A (en) | 2010-09-10 |
EP2049303B1 (en) | 2013-04-17 |
DE102006035977A1 (en) | 2008-02-07 |
CN101495270A (en) | 2009-07-29 |
CN101495270B (en) | 2011-12-14 |
US20080214098A1 (en) | 2008-09-04 |
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