WO1998058774A1 - Elektrowerkzeugmaschine - Google Patents
Elektrowerkzeugmaschine Download PDFInfo
- Publication number
- WO1998058774A1 WO1998058774A1 PCT/DE1998/001247 DE9801247W WO9858774A1 WO 1998058774 A1 WO1998058774 A1 WO 1998058774A1 DE 9801247 W DE9801247 W DE 9801247W WO 9858774 A1 WO9858774 A1 WO 9858774A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- cam
- tool
- machine according
- racket
- spindle
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D16/00—Portable percussive machines with superimposed rotation, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D2211/00—Details of portable percussive tools with electromotor or other motor drive
- B25D2211/06—Means for driving the impulse member
- B25D2211/062—Cam-actuated impulse-driving mechanisms
- B25D2211/064—Axial cams, e.g. two camming surfaces coaxial with drill spindle
Definitions
- the invention relates to an electric machine tool for rotating and / or striking tools, such as a hammer drill and / or hammer or impact drill, of the type defined in the preamble of claim 1.
- the driver unit comprises an eccentric, which is seated on a countershaft driving the work spindle via a gearwheel and receives a linkage sleeve having a breakthrough via a needle bearing, and an elastically flexible Driver link, which is fixed in the machine housing so as to be tiltable about an axis oriented transversely to the countershaft.
- the driver member has a lever extending from the axis to the articulation sleeve, which engages in the opening thereof, and a two-legged bracket extending at right angles to it from the axis, which at its free end closes like a loop and with play between two on the racket trained frets is articulated.
- the Racket is accommodated in the hollow drive spindle with play, whereby an inserted O-ring has a damping effect on the racket and prevents it from moving automatically.
- a striker or firing pin is arranged between the tool shaft and the racket.
- the driver member In operation, the driver member is driven back and forth via the eccentric, only the vertical deflections of the eccentric being transmitted to the lever, while the transverse movement of the anchor sleeve does not reach the lever due to the widened opening in this direction.
- the driver member thus executes a reciprocating movement about its axis.
- the driver member At the moment of the impact of the racket on the striker and thus on the tool, the driver member is in its dead center on the tool side.
- the racket is reflected after the hard impact and flies backwards towards the likewise moving back bracket of the driver member. If the striking mechanism is properly tuned, the front collar touches the bracket of the driver link only slightly or not at all.
- the power tool according to the invention with the characterizing features of claim 1 has the advantage that a countershaft is dispensed with by the mechanical striking mechanism constructed in accordance with the invention, and a higher spindle speed can thus be realized.
- a countershaft is dispensed with by the mechanical striking mechanism constructed in accordance with the invention, and a higher spindle speed can thus be realized.
- a corresponding number of impacts per spindle revolution are achieved.
- an electric hand tool with a focus on small tool diameters can be manufactured very inexpensively, in which the lubrication effort is quite low.
- the elevations and depressions of the cam tracks extending parallel to the axial direction of the work spindle are formed by several periods of a sinusoidal curve, the two cam tracks running parallel or offset from one another. Three or five periods of a sine curve per curve path are preferred.
- the spring accumulators are designed as compression springs that are simple and inexpensive to manufacture and assemble.
- the drill hammer shown in detail in FIG. 1 in longitudinal section as an exemplary embodiment of a general, preferably hand-held power tool with rotating and / or striking tool, has a housing 10 and a sleeve-shaped work spindle 11, also called spindle sleeve, which is mounted in the housing 10 to rotate and axially displaceably. and an electric motor (not shown here) for the rotary drive of the work spindle 11.
- a tool holder 12 is formed at the front end of the work spindle 11, in which the shank 13 of a tool is received in a rotationally fixed and axially displaceable manner.
- the work spindle 11 is set in rotation by a gearwheel 14, which sits on the spindle end of the work spindle 11 facing away from the tool holder 12 and meshes with a drive pinion 14 which is formed on the shaft end of a drive shaft 15 mounted in the housing 10.
- the drive shaft 15 is connected to the output shaft of the electric motor via a gear (not shown here) or forms the output shaft itself.
- a mechanical percussion mechanism 16 is provided which accelerates in its axial direction and strikes the shaft 13 of the tool held in the tool holder 12 via a firing pin or striker 17 and a striker 18
- the driver unit 20 comprises a scanning member 21, which rotates synchronously with the work spindle 11 and is axially displaceably arranged, is guided between two parallel, annular cam tracks 22, 23 with axial play, which are arranged in the housing 10 and are rotated coaxially with the work spindle 11, and two in the displacement path of the racket 18 effective, mutually oppositely acting spring accumulators, which can be tensioned directly or indirectly by the scanning member 21, the spring accumulators preferably being designed as compression springs 24, 25.
- a development of the cam tracks 22, 23 is shown in detail in FIG. 3, arrow 28 in FIG. 3 lying in the axial direction of the work spindle 11 and pointing to the tool holder 12.
- the cam tracks 22 have elevations 221 and 231 and depressions 222 and 223 which point in the axial direction of the work spindle 11.
- the elevations 221 and 231 and depressions 222 and 232 are represented by a sine curve, with several periods of a sine curve being present over the circumference of the curved paths 22, 23. Preferably three or five periods are provided so that on each
- Cam track 22 or 23 therefore three or five elevations 221 or 231 and three or five depressions 222 or 232 are present.
- the number of elevations and depressions that are colinear in the axial direction depends on the desired number of impacts on the shaft 13 of the tool during one revolution of the work spindle 11.
- the cam tracks 22 and 23 are each formed on a cam disk 26 and 27, respectively.
- the cam disc 26 is fixed rigidly in the housing 10.
- the cam disc 27 is preferably three on one coaxial to the work spindle 11
- the bolts 29 are clamped in the machine housing 10 and each take on a pressure spring 30, which is supported between the two cams 26, 27.
- Pressure springs 30 bear the cam disk 27 against an axial bearing 33, which is axially fixed on the work spindle 11 by means of two disks 31, 32.
- the displaceability of the cam 27 serves to switch the striking mechanism 16 on and off. If the operator holding the hammer drill presses the tool clamped in the tool holder 12 against a machining surface, the tool is displaced into the tool holder 12 by a limited displacement path. The displacement movement of the tool is transmitted from the shaft 13 to the striker 17, which, via the snap ring 19, displaces the work spindle 11 mounted in the housing 10 by means of a slide bearing 34 and a ball bearing 35 until the cam disc 27 on a stop 36 formed in the housing 10 strikes. In this operating position shown in FIG.
- the striking mechanism 16 is switched on and the scanning member 21 is guided between the two cam tracks 22, 23 on the cams 26, 27. If the tool is lifted from the machining surface, the pressure springs 30 push the cam plate 27 to the right in FIG. 1, the cam plate 27 pushing the work spindle 11 back via the axial bearing 33. The The distance between the two cam tracks 22, 23 is increased to such an extent that the scanning member 21 rotates freely between the two cam tracks 22, 23 without coming into contact with them. The striking mechanism 16 is switched off.
- a manually operated shut-off element 37 is arranged on the machine housing 10 in the form of a toggle handle which can be rotated through 180 ° and into which a dowel pin 38 is inserted.
- the shut-off member 37 By turning the shut-off member 37 by 180 °, the dowel pin 38 swivels into the displacement path of the cam disk 27 and lies in the basic position of the cam disk 27, which it assumes when the tool is not under load, under the restoring force of the pressure springs 30, as a stop directly in front of the cam disk 27. So that's one
- the scanning member 21 sits with a ring part 39 with play on the racket 18 and projects with a scanning finger 40 projecting radially from the ring part 39 through an axial slot 41 in the spindle sleeve 11 until between the cam tracks 22, 23 on the two cams 26, 27 .
- the scanning finger 40 is also indicated in the development of the curved paths 22, 23 in FIG. 3.
- the two compression springs 24, 25 of the driver unit 20 are pushed onto the racket 18 and are supported, on the one hand, on the end faces of the ring part 39 facing away from one another in the axial direction and, on the other hand, on radial shoulders 42, 43 formed on the racket 18.
- the cam track 22 accelerates the striker 18 in the direction of the striker 17 with each elevation 221, which strikes the striker 17 and, via this, strikes the end face of the shaft 13 of the tool exercises.
- the parallel spacing of the two cam tracks 22, 23 with the cam disk 27 resting against the stop 36 on the housing 10 and the compression springs 24, 25 are matched to one another such that the scanning finger 40 of the scanning member 20 when the racket 18 strikes the striking block 17 from the cam tracks 22 , 23 is largely decoupled.
- the bat 18 is reflected after the impact on the striker 17 and flies backwards towards the depression 222 of the cam track 22.
- the scanning finger 40 touches the depression 232 of the cam track 23 only slightly or not at all. Under certain circumstances, it may be necessary to offset the cam tracks 22, 23 in circumferential direction from one another in order to tune the striking mechanism. After passing through the dead center of the cam track 22 at the deepest point of the recess 222, the scanning finger 40 touches the cam track 22 again. Due to the kinetic energy of the racket 18, the racket 18 is displaced against the compression spring 25 in the direction of the scanning member 21 and is thus tensioned, so that kinetic energy of the racket 18 is stored in spring tension. The bat 18 is then accelerated forward by this energy and by the subsequent elevation 221 of the cam track 22. Before the racket 18 hits the striker 17, the scanning finger 40 detaches from the cam track 22 and the process described is repeated.
- the scanning element 21 is formed by the spring ends 241 and 251 of the two compression springs 24, 25 which are bent radially outwards and lie against one another.
- a separate component with ring part 39 and scanning finger 40 is omitted.
- the two spring ends 241, 251 which are firmly connected to one another protrude through the axial slot 41 in the spindle sleeve or drive spindle 11 after assembly and are guided between the two cam tracks 22, 23 on the cam disks 26, 27 in the same manner as described.
- Fig. 5 is still sketched that the two abutting spring ends can also be integrally connected.
- the two compression springs 24, 25 then form a one-piece compression spring 44 with a radially projecting spring arch 441, which passes through the axial slot 41 in the spindle sleeve or drive spindle 11 and is guided as a scanning element 21 between the cam tracks 22, 23.
- Driver unit 20 is modified compared to the driver unit 20 described above in that the compression springs 24, 25 are arranged outside the spindle sleeve or drive spindle 11.
- the scanning member 21 has two sliding rings 45, 46 seated with play on the spindle sleeve 11, on each of which a radially projecting, hollow scanning projection 45a, 46a is integrally formed.
- a connecting pin 47 which is guided through the passage slot 41 in the spindle sleeve 11 and anchored in the racket 18, projects into the mutually displaceable scanning projections 45a, 46a.
- Axial holding slots 45b, 46b are located in the scanning projections 45a, 46a, through which the connecting pin 47 engages.
- the connecting pin 47 is fixed in rotation in the scanning projections 45a, 46a, but can be moved in the axial direction with the slide rings 45, 46.
- Scanning cams 45, 46 arranged compression springs 24, 25 are supported on the one hand on the inner wall of the scanning cams 45, 46 and on the other hand on the connecting pin 47.
- the sliding rings 45, 46 are urged away from each other, so that the connecting pin 47 comes to bear on tabs 45c, 46c on the scanning projections 45a, 46a.
- the arrangement of the cam disks 26, 27 is made as in FIG. 1, so that the scanning cams 45, 46 are guided between the two cam tracks 22, 23.
- the cam disk 26 carrying the cam track 21 is also designed to be axially displaceable and, like the cam disk 27, is axially displaceably guided on the bolt 29.
- the cam disk 27 is divided transversely to its axial direction into a disk part 271 which carries the cam track 23 and a disk part 272 which is supported on the axial bearing 33 fixed on the spindle sleeve or drive spindle 11.
- the scanning member 21 is rigidly connected to the racket 18 and projects through the axial section 41 in the spindle sleeve 11 and is in turn guided between the two cam tracks 22, 23.
- the two compression springs 24, 25 coaxially surround the spindle sleeve 11, the compression spring 24 being supported between the housing 10 and the cam disk 26 and the compression spring 25 being supported between the two disk parts 271 and 272 of the cam disk 27.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Drilling And Boring (AREA)
- Percussive Tools And Related Accessories (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/242,599 US6199640B1 (en) | 1997-06-21 | 1998-05-06 | Electric machine tool |
EP98933451A EP0930957B1 (de) | 1997-06-21 | 1998-05-06 | Elektrowerkzeugmaschine |
DE59803839T DE59803839D1 (de) | 1997-06-21 | 1998-05-06 | Elektrowerkzeugmaschine |
BR9806112-7A BR9806112A (pt) | 1997-06-21 | 1998-05-06 | Máquina-ferramenta elétrica. |
JP11503524A JP2001500070A (ja) | 1997-06-21 | 1998-05-06 | 電気的な工作機械 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19726383.6 | 1997-06-21 | ||
DE19726383A DE19726383A1 (de) | 1997-06-21 | 1997-06-21 | Elektrowerkzeugmaschine |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1998058774A1 true WO1998058774A1 (de) | 1998-12-30 |
Family
ID=7833235
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE1998/001247 WO1998058774A1 (de) | 1997-06-21 | 1998-05-06 | Elektrowerkzeugmaschine |
Country Status (7)
Country | Link |
---|---|
US (1) | US6199640B1 (de) |
EP (1) | EP0930957B1 (de) |
JP (1) | JP2001500070A (de) |
CN (1) | CN1072549C (de) |
BR (1) | BR9806112A (de) |
DE (2) | DE19726383A1 (de) |
WO (1) | WO1998058774A1 (de) |
Families Citing this family (35)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10007665A1 (de) * | 2000-02-19 | 2001-09-06 | Scintilla Ag | Werkzeugmaschine |
US7743847B2 (en) * | 2000-08-15 | 2010-06-29 | Wave Craft Limited | Cam operated devices |
DE10059389B4 (de) * | 2000-11-30 | 2007-03-29 | Robert Bosch Gmbh | Handwerkzeugmaschine mit einem Schlagwerk |
DE10059388A1 (de) | 2000-11-30 | 2002-06-13 | Bosch Gmbh Robert | Handwerkzeugmaschine |
DE10149216A1 (de) * | 2001-10-05 | 2003-04-24 | Bosch Gmbh Robert | Handwerkzeugmaschine |
TW554792U (en) * | 2003-01-29 | 2003-09-21 | Mobiletron Electronics Co Ltd | Function switching device of electric tool |
TW556637U (en) * | 2003-02-24 | 2003-10-01 | Mobiletron Electronics Co Ltd | Power tool |
DE102004045117A1 (de) * | 2004-09-17 | 2006-03-23 | Robert Bosch Gmbh | Schaltvorrichtung |
GB2423044A (en) * | 2005-02-10 | 2006-08-16 | Black & Decker Inc | Hammer with cam-actuated driven member |
EP1690640B1 (de) * | 2005-02-10 | 2013-03-06 | Black & Decker Inc. | Handgehaltene Schlagmaschine |
GB2423049A (en) * | 2005-02-10 | 2006-08-16 | Black & Decker Inc | Hammer with striker connected to pivoting arm by spring |
GB2423050A (en) * | 2005-02-10 | 2006-08-16 | Black & Decker Inc | Hammer with ramps causing pivotal oscillation |
CN101288950B (zh) * | 2007-04-18 | 2011-08-03 | 苏州宝时得电动工具有限公司 | 多功能动力工具 |
GB0712557D0 (en) * | 2007-06-29 | 2007-08-08 | Fisher Hugh E | Improved tools |
GB0716849D0 (en) * | 2007-08-30 | 2007-10-10 | Fisher Hugh E | Improved tool |
US7854274B2 (en) * | 2007-11-21 | 2010-12-21 | Black & Decker Inc. | Multi-mode drill and transmission sub-assembly including a gear case cover supporting biasing |
US7798245B2 (en) * | 2007-11-21 | 2010-09-21 | Black & Decker Inc. | Multi-mode drill with an electronic switching arrangement |
US7770660B2 (en) | 2007-11-21 | 2010-08-10 | Black & Decker Inc. | Mid-handle drill construction and assembly process |
US7717191B2 (en) | 2007-11-21 | 2010-05-18 | Black & Decker Inc. | Multi-mode hammer drill with shift lock |
US7735575B2 (en) * | 2007-11-21 | 2010-06-15 | Black & Decker Inc. | Hammer drill with hard hammer support structure |
US7762349B2 (en) | 2007-11-21 | 2010-07-27 | Black & Decker Inc. | Multi-speed drill and transmission with low gear only clutch |
US7717192B2 (en) * | 2007-11-21 | 2010-05-18 | Black & Decker Inc. | Multi-mode drill with mode collar |
US7757922B2 (en) * | 2008-02-04 | 2010-07-20 | Jelley Technology Co., Ltd | Power beating device |
CN201201225Y (zh) * | 2008-05-20 | 2009-03-04 | 东莞群胜粉末冶金有限公司 | 冲击钻的冲击切换装置 |
US8251158B2 (en) | 2008-11-08 | 2012-08-28 | Black & Decker Inc. | Multi-speed power tool transmission with alternative ring gear configuration |
DE102009027442A1 (de) * | 2009-07-03 | 2011-01-05 | Robert Bosch Gmbh | Handwerkzeugmaschine |
DE102010062099A1 (de) * | 2010-11-29 | 2012-05-31 | Robert Bosch Gmbh | Hammerschlagwerk |
CN102847976A (zh) * | 2012-08-28 | 2013-01-02 | 方荣泉 | 快速钻孔自动断削磁力空芯钻 |
EP2918376A1 (de) * | 2014-03-12 | 2015-09-16 | HILTI Aktiengesellschaft | Meisselnde Handwerkzeugmaschine |
TWI513556B (zh) * | 2015-04-10 | 2015-12-21 | Mobiletron Electronics Co Ltd | Power tools and their torque switching devices |
CN106142022B (zh) * | 2015-04-16 | 2019-01-04 | 车王电子股份有限公司 | 电动工具及其扭力切换装置 |
DE102015217180A1 (de) * | 2015-09-09 | 2017-03-09 | Robert Bosch Gmbh | Tragbare Energiespeichervorrichtung zur Versorgung von Werkzeugen |
EP3356087B1 (de) * | 2016-08-31 | 2022-12-14 | DePuy Synthes Products, Inc. | Orthopädische einschlagvorrichtung mit einer masse zur verabreichung einer kontrollierten, wiederholbaren und reversiblen einschlagkraft |
US11083512B2 (en) * | 2016-08-31 | 2021-08-10 | DePuy Synthes Products, Inc. | Orthopedic device delivering a controlled, repeatable impact |
EP3392974A1 (de) | 2017-04-21 | 2018-10-24 | HILTI Aktiengesellschaft | Federkontakt an einem akkumulator |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1505493A (en) * | 1920-08-13 | 1924-08-19 | C S Somervell | Impact tool |
WO1979001041A1 (en) * | 1978-05-09 | 1979-11-29 | Bosch Gmbh Robert | Hand mechanical tool |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5513709A (en) * | 1988-06-23 | 1996-05-07 | Fisher; Hugh E. | Power tool |
DE4121279A1 (de) | 1991-06-27 | 1993-01-07 | Bosch Gmbh Robert | Bohr- und/oder schlaghammer |
GB9126970D0 (en) * | 1991-12-19 | 1992-02-19 | Fisher Hugh E | Power tool 111 |
US5449044A (en) * | 1993-10-29 | 1995-09-12 | Phillips; Raymond J. | Miniature impact tool |
JP3568128B2 (ja) * | 1994-02-25 | 2004-09-22 | 日立工機株式会社 | 回転打撃工具 |
-
1997
- 1997-06-21 DE DE19726383A patent/DE19726383A1/de not_active Withdrawn
-
1998
- 1998-05-06 DE DE59803839T patent/DE59803839D1/de not_active Expired - Fee Related
- 1998-05-06 EP EP98933451A patent/EP0930957B1/de not_active Expired - Lifetime
- 1998-05-06 US US09/242,599 patent/US6199640B1/en not_active Expired - Fee Related
- 1998-05-06 JP JP11503524A patent/JP2001500070A/ja active Pending
- 1998-05-06 BR BR9806112-7A patent/BR9806112A/pt not_active Application Discontinuation
- 1998-05-06 CN CN98800811A patent/CN1072549C/zh not_active Expired - Fee Related
- 1998-05-06 WO PCT/DE1998/001247 patent/WO1998058774A1/de active IP Right Grant
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1505493A (en) * | 1920-08-13 | 1924-08-19 | C S Somervell | Impact tool |
WO1979001041A1 (en) * | 1978-05-09 | 1979-11-29 | Bosch Gmbh Robert | Hand mechanical tool |
Also Published As
Publication number | Publication date |
---|---|
CN1229377A (zh) | 1999-09-22 |
JP2001500070A (ja) | 2001-01-09 |
DE19726383A1 (de) | 1998-12-24 |
EP0930957B1 (de) | 2002-04-17 |
EP0930957A1 (de) | 1999-07-28 |
DE59803839D1 (de) | 2002-05-23 |
BR9806112A (pt) | 1999-08-31 |
CN1072549C (zh) | 2001-10-10 |
US6199640B1 (en) | 2001-03-13 |
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