EP1663574A1 - Handwerkzeugmaschine - Google Patents
HandwerkzeugmaschineInfo
- Publication number
- EP1663574A1 EP1663574A1 EP04738803A EP04738803A EP1663574A1 EP 1663574 A1 EP1663574 A1 EP 1663574A1 EP 04738803 A EP04738803 A EP 04738803A EP 04738803 A EP04738803 A EP 04738803A EP 1663574 A1 EP1663574 A1 EP 1663574A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- work spindle
- wedge means
- inner flange
- collar
- flange
- 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
- 239000000314 lubricant Substances 0.000 claims description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 241000119744 Allium motor Species 0.000 description 1
- 230000000981 bystander Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000000034 method 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
- B24B23/028—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
- 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
- B24B23/022—Spindle-locking devices, e.g. for mounting or removing the tool
-
- 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
- B24B45/00—Means for securing grinding wheels on rotary arbors
Definitions
- the invention is based on a .motor-driven hand tool according to the preamble of claim 1.
- a generic hand tool is known from EP 0 604 477.
- Their work spindle can be locked or braked with a spindle stop device, the disc-shaped machining tool being prevented from loosening the clamping device and itself from the work spindle in the event of abrupt braking, an unintentional loosening resulting in considerable dangers for the operator or bystanders can lead.
- the known solution consists of a relatively large number of individual parts.
- the handheld power tool according to the invention with the characterizing features of claim 1 has the advantage that it is light, compact and inexpensive.
- spindle-side wedge means are arranged on a separate collar of the work spindle and are designed as ring wedges, robust means are thus created for reliable axial adjustment by twisting.
- the collar is an integral part of the work spindle, the number of individual parts of the handheld power tool is reduced and these can be produced inexpensively.
- the safety device is robust and reliable. Due to the fact that the collar has radial cams that are held in recesses in the ring collar with a defined torsional backlash, the clamping pressure on the tool can be increased reliably and automatically if required.
- the work spindle has an annular groove into which a snap ring can be snapped in order to axially secure the inner flange, the work spindle can be easily and securely connected to the inner flange against loss and high functional reliability can be achieved.
- the snap ring is made of plastic, the inner flange can be easily detached from the work spindle if required.
- the safety device or the entire hand-held power tool can securely accommodate grinding wheels of different properties and dimensions.
- the positive connection between the inner and additional flange is formed by mutual, in particular regular, radial projections and recesses, these can be non-positively coupled by plugging them together, like a toothed shaft with a toothed hub.
- FIG. 1 shows a cross section of a handheld power tool with a safety device in the area of the work spindle
- FIG. 2 shows an exploded view of the work spindle with inner flange and detonating device
- 3 shows an exploded view of the output shaft with the inner flange seen from above
- FIG. 4 shows a special version of the inner flange with additional flange from obliquely below
- FIG. 5 shows the representation according to FIG. 4 from obliquely above.
- the angle grinder 10 shown in a sectional view from the front in FIG. 1 engages with its gear housing 15 a work spindle 17 which is held in a bearing 21 with a stepped collar 19 in the upper region.
- the work spindle 17 On its circumference, the work spindle 17 carries a ring gear 29 in a rotationally fixed manner.
- the ring gear 29 is assigned a spindle stop device 31 arranged in the gear housing 15, which essentially consists of a pressure pin 35 which is axially displaceable against a spring 33 and which is located in recesses 37 the outer circumference of the ring gear 29 can snap into place. With the latching, he can stop the ring gear 29 and since it the work spindle 17.
- a grinding wheel 43 is clamped between an inner flange 39 and an outer flange 41.
- the inner flange 39 with its central bore, rotatably overlaps the free end of the work spindle 17 and can be axially displaced thereon up to a collar 23.
- the external flange 41 sits with its internal thread on an external thread 47 of the work spindle 17.
- the external thread 47 has a certain pitch angle, to which the following applies
- the grinding wheel 43 has a central recess 49 with which it engages over the working spindle 17 with less radial play, its flat side being supported on the inner flange 3.
- the side of the inner flange 39 facing the grinding wheel 43 has a profiled surface 42 (FIG. 2) designed as an axial tooth system, which is pressed into the grinding wheel 43 supported thereon, so that when the outer flange 41 is screwed tightly, a positive-locking surface is formed between the grinding wheel 43 and the grinding wheel 43 Coupling results.
- the inner flange 39 carries on its side facing away from the grinding wheel 43 an annular wedge-like oblique wedge body 51 with an axial wedge surface 53 rising at a certain angle, which is supported on an axial counter wedge surface 55 of the collar 23 rising in the same direction.
- the wedge angles of the wedge surfaces 53, 55 increase more than the external thread 47 at the free end of the work spindle 17 or the thread of the outer flange 41.
- the lateral stop surfaces 61, 62 of the two diametrically opposite recesses 57 of the inner flange 39 act as radial stops.
- the recesses 57 are at most twice as wide as the cams 25 of the opposite one another
- Inner flange 39 balanced or exceeded.
- the working direction of rotation of the work spindle 17 corresponds to that of the inner flange 39 or the outer flange 41 when the grinding wheel 43 is driving it and is indicated by an arrow 65 pointing to the left.
- the width of the recesses 57 is dimensioned such that the wedging surfaces 53, 55 do not touch the radial stop 61 or 63 in the recesses 57 even with an extremely long rotation path and sliding on one another, because this causes a further axial displacement of the Prevents inner flange 39 and thus an unintentional loosening of the grinding wheel 43 would be possible.
- the wedge body 51 When screwing on the outer flange 41 for tensioning the grinding wheel 43, the smallest possible axial distance between the inner flange 39 on the end face of the collar 23 is always produced by turning it to the right together with the outer flange, i.e. the wedge surfaces 53, 55 are supported on it minimum twist position on each other. In the tensioned state, the wedge body 51 will therefore always bear against the rear boundary wall 63 of the recess 57.
- the purpose of the limitation of the rotation of the inner flange 39 relative to the work spindle 17 to increase the clamping pressure as a process safety device is to ensure that the clamping pressure does not increase to such an extent that the outer flange 41 can only be released with an extremely high expenditure of force and time, possibly not without destruction.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
- Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2003137853 DE10337853A1 (de) | 2003-08-18 | 2003-08-18 | Handwerkzeugmaschine |
PCT/DE2004/001357 WO2005016594A1 (de) | 2003-08-18 | 2004-06-26 | Handwerkzeugmaschine |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1663574A1 true EP1663574A1 (de) | 2006-06-07 |
EP1663574B1 EP1663574B1 (de) | 2007-04-11 |
Family
ID=34177669
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04738803A Expired - Lifetime EP1663574B1 (de) | 2003-08-18 | 2004-06-26 | Handwerkzeugmaschine |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1663574B1 (de) |
DE (2) | DE10337853A1 (de) |
WO (1) | WO2005016594A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2502704A1 (de) | 2011-03-23 | 2012-09-26 | Makita Corporation | Elektrisches Werkzeug |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8047242B2 (en) | 2007-12-07 | 2011-11-01 | Black & Decker Inc. | Power tool with spindle lock |
DE102008015955A1 (de) * | 2008-03-20 | 2009-08-13 | Metabowerke Gmbh | Handwerkzeuggerät |
ITBS20080202A1 (it) * | 2008-11-10 | 2010-05-11 | Lauro Boniotti Ing | Disco abrasivo da taglio o da sbavo con adattatore a centro depresso |
CN202622566U (zh) * | 2009-07-09 | 2012-12-26 | Tj开发公司 | 用于将磨石附接在轴上的装置 |
DE102010043186A1 (de) * | 2010-10-29 | 2012-05-03 | Robert Bosch Gmbh | Handwerkzeugmaschinenspannvorrichtung |
BE1022238B1 (nl) * | 2013-09-15 | 2016-03-04 | THIJS, Marc | Snel monteerbaar gereedschap |
CN207189852U (zh) | 2017-06-05 | 2018-04-06 | 米沃奇电动工具公司 | 台锯 |
EP3960384B1 (de) | 2020-08-28 | 2024-06-05 | Black & Decker Inc. | Luftansaugkonfiguration in einem elektrowerkzeug |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3613987A1 (de) * | 1986-04-25 | 1987-10-29 | Metabowerke Kg | Vorrichtung zum loesbaren befestigen einer schleifscheibe |
DE3844617A1 (de) * | 1988-08-26 | 1990-03-22 | Licentia Gmbh | Elektrowerkzeugmaschine mit einer kombinierten einrichtung zur stillstandsbremsung und zum spannen des werkzeugs |
US5464365A (en) * | 1991-09-21 | 1995-11-07 | Robert Bosch Gmbh | Motor-driven hand-held machine tool |
DE19944564A1 (de) * | 1999-09-17 | 2001-03-22 | Bosch Gmbh Robert | Handwerkzeugmaschine |
-
2003
- 2003-08-18 DE DE2003137853 patent/DE10337853A1/de not_active Ceased
-
2004
- 2004-06-26 EP EP04738803A patent/EP1663574B1/de not_active Expired - Lifetime
- 2004-06-26 WO PCT/DE2004/001357 patent/WO2005016594A1/de active IP Right Grant
- 2004-06-26 DE DE502004003492T patent/DE502004003492D1/de not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO2005016594A1 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2502704A1 (de) | 2011-03-23 | 2012-09-26 | Makita Corporation | Elektrisches Werkzeug |
Also Published As
Publication number | Publication date |
---|---|
WO2005016594A1 (de) | 2005-02-24 |
EP1663574B1 (de) | 2007-04-11 |
DE10337853A1 (de) | 2005-03-17 |
DE502004003492D1 (de) | 2007-05-24 |
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