EP0341242A1 - Eccentric grinder. - Google Patents
Eccentric grinder.Info
- Publication number
- EP0341242A1 EP0341242A1 EP87907579A EP87907579A EP0341242A1 EP 0341242 A1 EP0341242 A1 EP 0341242A1 EP 87907579 A EP87907579 A EP 87907579A EP 87907579 A EP87907579 A EP 87907579A EP 0341242 A1 EP0341242 A1 EP 0341242A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- ring
- rolling
- rings
- grinder according
- eccentric
- 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
- 238000005096 rolling process Methods 0.000 claims description 82
- 239000002184 metal Substances 0.000 claims description 6
- 229910052751 metal Inorganic materials 0.000 claims description 6
- 238000005520 cutting process Methods 0.000 claims description 4
- 238000006073 displacement reaction Methods 0.000 claims description 2
- 230000002093 peripheral effect Effects 0.000 claims 1
- 239000006061 abrasive grain Substances 0.000 description 8
- 239000000428 dust Substances 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 235000014676 Phragmites communis Nutrition 0.000 description 1
- -1 Sintered metals Chemical class 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000005540 biological transmission 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
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000001000 micrograph Methods 0.000 description 1
- 230000001360 synchronised effect Effects 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 is based on an eccentric grinder, the type defined in the preamble of claim 1.
- Rolling means of the second rolling ring is effected, loading Each abrasive grain writes a ⁇ hypocycloid on the sanding plate, so that the path of the abrasive grains per eccentric revolution is increased, thereby forcing a larger grain removal.
- the reed picture changes accordingly.
- each abrasive grain describes a pericycloid.
- the grinding path of the abrasive grains per eccentric revolution becomes maximum. This grinding movement causes the greatest grain abrasion and is therefore well suited for rough grinding.
- the eccentric grinder according to the invention with the characterizing features of claim 1 has the advantage that the desired switchover option for the grinding movement of the grinding plate is achieved with an extremely small axial overall height of the grinder housing.
- the switchover can be carried out quickly without having to wait for the grinding plate to come to a standstill, since the grinding plate slewing rings and their associated rolling rings do not first have to be brought into engagement at different levels, but rather constantly and from the start Engagement with each other.
- the switchover can thus be carried out without gear wear even during the grinding process, that is to say without the drive being switched off.
- the switching device is user-friendly and easy to use.
- the turning and rolling rings can be designed either as sprockets according to the embodiment in claim 13 or as friction rings according to the embodiment in claim 16.
- An advantageous embodiment of the invention also results from claim 4.
- good transmission of the friction and friction in the mutually engaging drive and rolling means and in the ring guides of the rolling rings generated heat in the interior of the housing, where the heat is then dissipated by air movement.
- appropriate metals e.g. Sintered metals
- the rolling rings can slide smoothly in the ring guides. If the turning and rolling rings are designed as toothed rings, the result is a low-noise gear with small manufacturing tolerances.
- An advantageous embodiment of the invention also results from claim 14.
- the sine toothing results in a soft, wear-free engagement which is achieved by the rotating and rolling rings designed as toothed rings.
- the type of toothing is less sensitive to grinding dust than involute toothing.
- the simultaneous engagement of several teeth is ensured by the slight difference in diameter of the part circles of the rotating and rolling rings.
- An advantageous embodiment of the invention results from claim 15.
- Fig. 2 shows a section along the line II-II of
- FIG. 3 shows a longitudinal section of an eccentric grinder according to a second exemplary embodiment
- FIG. 4 is an enlarged view of the detail A in Fig. 3,
- FIG. 5 shows a longitudinal section of an eccentric grinder according to a third exemplary embodiment
- FIG. 7 shows the same representation as in FIG. 6 of an eccentric grinder according to a further exemplary embodiment
- 8 shows a schematic illustration of a sine toothing.
- the eccentric grinder seen in longitudinal section in FIG. 1 has a pot-like or bell-like housing 10, which is closed off at the lower open edge with a metallic support plate 11.
- a suction nozzle 13 In the interior 12 of the housing 10 opens a suction nozzle 13, through which air and thus heat and dust can be extracted from the housing interior 12.
- an eccentric 15 In the interior of the housing 12 there is an eccentric 15 which is rotatably driven by means of an electric motor (not shown) via its output shaft 14.
- a grinding plate 16 is rotatably mounted in the eccentric 15.
- a support pin 18 is supported in a recess 17 of the eccentric 15 via a ball bearing 19, which projects through a through opening 19 in the support plate 11 and carries the grinding plate 16 at the free end.
- the grinding plate 16 is fixed on the trunnion 18 by a screw 21 screwed into a threaded bore 20 in the trunnion 18.
- a soft-elastic covering 22 is glued onto the outer end face of the grinding plate 16 and serves to receive the actual grinding sheet 23.
- the axis of rotation 24 of the grinding plate 16 and the support pin 18 runs parallel to the axis of rotation 25 of the eccentric 15 and thus the output shaft 14 at a distance from the eccentricity e.
- the grinding plate 16 On the rear side facing the support plate 11, the grinding plate 16 carries two rotating rings 26 and 27 which are fastened concentrically to its axis of rotation 24 and which are preferably formed in one piece with the grinding plate 16.
- Each slewing ring .26.27 . is formed by a ring gear, where in the case of the first slewing ring 26 with a larger diameter, an internal toothing 28 and the second slewing ring 27 with a smaller diameter have an external toothing 29. Internal teeth 28 and external teeth 29 can also be assigned to the other ring gear.
- Each of the two slewing rings 26, 27 is assigned a rolling ring 30 or 31, which is also designed as a toothed ring.
- the rolling rings 30, 31 are rotatably held in ring guides 32, 33 which are concentrically fixed to the support plate 11.
- the first rolling ring 30 with the larger diameter has an outer toothing 34 and the second rolling ring 31 with the smaller diameter has an inner toothing 35.
- the inner toothing 28 of the first rotating ring 26 stands with the outer toothing 34 of the first rolling toothed ring 30 and the outer toothing 29 of the second rotating ring 27 is in constant engagement with the internal toothing 35 of the second rolling ring 31.
- the teeth are designed as so-called sine teeth, which are schematically outlined in FIG. 8.
- the rolling rings 30, 31 are made of metal, preferably sintered metal, and the rotating rings 26, 27 are made of plastic.
- the ring guides 32, 33 are formed by a ring web 36 projecting axially on the support plate 11 and integral with this and a ring flange 37 fastened on the end face of the ring web 36, which projects radially beyond the ring web 36 on both sides.
- two concentric ring grooves are defined as ring guides by the ring web 36, the support plate 11 and the ring flange 37, in which the rolling rings 30, 31 lie on their rear sides facing away from the toothings 34, 35.
- the two rolling rings 30, 31 can either rotate freely in the ring guides 32, 33 or alternately on the support plate 11 are non-rotatably fixed, whereby a total of three different types of movement of the grinder 16 are achieved.
- a switching device 38 with three switching positions is provided, which has a switching lever 39 pivotable into the three switching positions and a locking device 40 actuated by the switching lever 39.
- the locking device 40 is designed such that it alternately holds one of the two rolling rings 30, 31 non-rotatably on the support plate 11 in the two extreme positions of the switching lever 39 and in the middle position of the switching lever lying between the two extreme positions returns the two rolling rings 30, 31 their free rotational mobility in the ring guides 32 and 33.
- both rolling rings 30, 31 are freely rotatable in the ring guides 32, 33, the grinding wheel 16 is driven solely via the eccentric 15, the grinding wheel 16 being freely rotatable about its axis of rotation 25.
- the grinding plate therefore executes a movement during grinding which follows a ⁇ cycloid with a superimposed rotary movement, the superimposition of the rotary movement being dependent on the pressure during grinding.
- the path of each individual grinding wheel per eccentric revolution is very small, which results in a very fine pattern. If the first rolling ring 30 5 with the external toothing 34 is fixed non-rotatably on the support plate 11, then the first rotating ring 26 with its internal toothing 28 rolls on the first rolling ring 3 ⁇ in the external toothing 34 thereof.
- Each grinding or grinding wheel 23 describes a pericycloid when grinding in this on ⁇ position, in which the rotational movement coincides with the direction of rotation of the eccentric 15. The path of the abrasive grains per revolution of the eccentric 15 is thereby greatest. This grinding movement causes the greatest removal and is therefore well suited for rough grinding fen. If the inner rolling ring 31 is non-rotatably held on the support plate 11, the second rotating ring 27 rolls with its external toothing 29 in the internal toothing 35 of the second rolling ring 31. Each abrasive grain of the abrasive sheet 23 now describes an elongated hypocycloid, moving against the direction of rotation of the eccentric 15. This results in a greater removal than in the case of free-wheel grinding of the two rolling rings 30, 31, but also less removal than in the case of the one described above
- the rolling rings 30, 31 can be blocked by clamping them in the ring guides 32, 33 as a result of the rotation of the cam 462.
- the cam 462 then provides a non-positive is an element that frictionally fixes the rolling rings 30, 31 in their ring guides 32, 33.
- the locking device 540 also has a force-locking element which fixes the rolling rings 30, 31 in their ring guides 32, 33 in a force-locking manner.
- This force circuit element here consists of brake shoes 563 which are pivotally mounted on the ring web 36 distributed over its circumference by means of pivot pin 564.
- the brake shoes 563 have an outer friction surface 565 and an inner friction surface 566, which can alternately be pressed against the rear sides of the rolling rings 30, 31 facing the web 36.
- the pressure is applied via an eccentric cam 567, which is connected to the 5 change-over levers (not shown here) and can be rotated in an oval passage opening 568 in the brake shoes 563.
- the eccentric cam 567 By pivoting the switching lever, the eccentric cam 567 is pivoted to the right or left and thereby presses the associated brake shoes 563 against the outer rolling ring 30 or the inner rolling ring 31. If several brake shoes 563 are provided, the eccentric cams 567 must be mechanically synchronized with one another become. It is also possible to dispense entirely with the brake shoes and to design the eccentric cam 567 in such a way that it acts non-positively on the rear sides of the rolling rings 30, 31 facing the web 36.
- the invention is not restricted to the exemplary embodiments described above.
- the slewing rings and their rolling rings can also be designed as friction rings instead of toothed rings, which are in engagement with one another via internal or external friction surfaces.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
Abstract
L'appareil de meulage d'encombrement axial réduit comprend un excentrique entraîné (15) et un support de disque tournant (16) qui peut tourner dans l'une ou l'autre direction de rotation par l'intermédiaire de couronnes (26, 27) fixées rigidement au support (16) et de couronnes (30, 31) portées par le boîtier (10), afin de moduler l'effet de meulage. La direction de rotation est commandée par un commutateur manuel (38). A cet effet, les couronnes (30, 31) peuvent tourner par rapport au boîtier (10) et engrènent constamment avec les couronnes (25, 26) fixées au support (10). Le commutateur (38) permet d'immobiliser à choix l'une des couronnes (30, 31) sur le boîtier (10) de façon que le support (16) roule sur la couronne immobilisée, ou de libérer les deux couronnes (30, 31) pour les faire tourner librement.The compact axial grinding apparatus comprises a driven eccentric (15) and a rotating disc holder (16) which can rotate in either direction of rotation via crowns (26, 27 ) rigidly fixed to the support (16) and crowns (30, 31) carried by the housing (10), in order to modulate the grinding effect. The direction of rotation is controlled by a manual switch (38). To this end, the crowns (30, 31) can rotate relative to the housing (10) and constantly mesh with the crowns (25, 26) fixed to the support (10). The switch (38) makes it possible to immobilize one of the crowns (30, 31) on the housing (10) so that the support (16) rolls on the immobilized crown, or to release the two crowns (30, 31) to rotate them freely.
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19863642741 DE3642741A1 (en) | 1986-12-13 | 1986-12-13 | Eccentric grinder |
DE3642741 | 1986-12-13 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0341242A1 true EP0341242A1 (en) | 1989-11-15 |
EP0341242B1 EP0341242B1 (en) | 1991-07-10 |
Family
ID=6316195
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19870907579 Expired - Lifetime EP0341242B1 (en) | 1986-12-13 | 1987-11-21 | Eccentric grinder |
Country Status (5)
Country | Link |
---|---|
US (1) | US4918868A (en) |
EP (1) | EP0341242B1 (en) |
JP (1) | JP2557928B2 (en) |
DE (2) | DE3642741A1 (en) |
WO (1) | WO1988004218A1 (en) |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3906549A1 (en) * | 1989-03-02 | 1990-09-06 | Bosch Gmbh Robert | Eccentric grinder |
GB9123502D0 (en) * | 1991-11-06 | 1992-01-02 | Black & Decker Inc | Sanding apparatus |
US5392568A (en) * | 1993-12-22 | 1995-02-28 | Black & Decker Inc. | Random orbit sander having braking member |
CA2220776A1 (en) * | 1996-11-13 | 1998-05-13 | Allen Sommers | Eccentric grinder loading system |
US6213851B1 (en) | 1998-07-07 | 2001-04-10 | Delta International Machinery Corp. | Abrading apparatus |
DE19952108B4 (en) * | 1999-10-29 | 2007-09-20 | Robert Bosch Gmbh | Exzentertellerschleifmaschine |
DE19963831B4 (en) * | 1999-12-30 | 2006-04-06 | Robert Bosch Gmbh | Eccentric disc grinder with a housing |
US6386947B2 (en) | 2000-02-29 | 2002-05-14 | Applied Materials, Inc. | Method and apparatus for detecting wafer slipouts |
DE10104993A1 (en) * | 2001-02-03 | 2002-08-22 | Bosch Gmbh Robert | Hand tool for grinding, polishing or the like |
DE10134308A1 (en) | 2001-07-14 | 2003-01-30 | Bosch Gmbh Robert | Hand tool |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2794303A (en) * | 1955-06-16 | 1957-06-04 | David R Wickes | Power-driven hand tool |
US3482362A (en) * | 1966-01-28 | 1969-12-09 | Ingersoll Rand Co | Double acting sander head |
FR2529497A1 (en) * | 1982-07-02 | 1984-01-06 | Black & Decker Inc | Base plate of orbital sander |
DE3602571C2 (en) * | 1986-01-29 | 1998-09-24 | Bosch Gmbh Robert | Eccentric disc grinder with a device for changing the grinding movement |
DE3609441A1 (en) * | 1986-03-20 | 1987-09-24 | Bosch Gmbh Robert | Eccentric grinder with a device for changing the grinding movement |
-
1986
- 1986-12-13 DE DE19863642741 patent/DE3642741A1/en not_active Withdrawn
-
1987
- 1987-11-21 US US07/368,363 patent/US4918868A/en not_active Expired - Lifetime
- 1987-11-21 JP JP62507067A patent/JP2557928B2/en not_active Expired - Fee Related
- 1987-11-21 WO PCT/DE1987/000540 patent/WO1988004218A1/en active IP Right Grant
- 1987-11-21 EP EP19870907579 patent/EP0341242B1/en not_active Expired - Lifetime
- 1987-11-21 DE DE8787907579T patent/DE3771342D1/en not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO8804218A1 * |
Also Published As
Publication number | Publication date |
---|---|
JPH02501548A (en) | 1990-05-31 |
DE3771342D1 (en) | 1991-08-14 |
DE3642741A1 (en) | 1988-06-23 |
WO1988004218A1 (en) | 1988-06-16 |
US4918868A (en) | 1990-04-24 |
JP2557928B2 (en) | 1996-11-27 |
EP0341242B1 (en) | 1991-07-10 |
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