EP0303955B1 - Handschleifmaschine - Google Patents

Handschleifmaschine Download PDF

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Publication number
EP0303955B1
EP0303955B1 EP88112981A EP88112981A EP0303955B1 EP 0303955 B1 EP0303955 B1 EP 0303955B1 EP 88112981 A EP88112981 A EP 88112981A EP 88112981 A EP88112981 A EP 88112981A EP 0303955 B1 EP0303955 B1 EP 0303955B1
Authority
EP
European Patent Office
Prior art keywords
shaft
axis
bodies
eccentric
grinding
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.)
Expired - Lifetime
Application number
EP88112981A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0303955A1 (de
Inventor
Miksa Marton
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to AT88112981T priority Critical patent/ATE63710T1/de
Publication of EP0303955A1 publication Critical patent/EP0303955A1/de
Application granted granted Critical
Publication of EP0303955B1 publication Critical patent/EP0303955B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B24B41/00—Component parts such as frames, beds, carriages, headstocks
    • B24B41/04—Headstocks; Working-spindles; Features relating thereto
    • B24B41/042—Balancing mechanisms
    • 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 a hand-held grinding machine with a motor-driven shaft, a grinding plate rotatably connected to the shaft, the axis of rotation of which is arranged eccentrically to the axis of the shaft, and an adjustable counterweight connected to the shaft, which compensates for the unbalance caused by the eccentric arrangement of the grinding plate .
  • Such a hand grinder is known for example from DE-OS 27 45 129.
  • the grinding plate does not rotate, but is guided on a circular path, which is due to the eccentric connection between the driven shaft and the grinding plate.
  • Such machines are mainly used for fine grinding because the translatory movement of the grinding plate on a circular path does not give rise to any grinding marks
  • the eccentric arrangement of the grinding plate to the driven shaft results in an imbalance which must be compensated for by a counterweight.
  • the counterweight is formed by a body which is detachably fastened to the end face of the end of the driven shaft adjacent to the grinding plate by means of screws. Instead, the counterweight could also be slidably attached.
  • the grinding plate itself is mounted in a recess arranged eccentrically in the end of the shaft. It goes without saying that the radial rays running through the shaft axis, to which the counterweight and the eccentric recess are arranged symmetrically, are directed opposite to one another with respect to the shaft axis.
  • Hand grinders of the type described are operated with interchangeable sanding sheets which are attached to the outside of the sanding plate.
  • the mass of the sanding sheet to be attached to the sanding plate can be taken into account when dimensioning the counterweight, it is possible to use different sanding sheets adapted to different work in connection with the sanding plate, which also have a different mass, so that depending on the type There may be certain imbalances in the abrasive sheet used, which, at the very high speeds with which such hand-held grinders usually work, can be very unpleasant and can seriously impair the well-being of a worker using a machine.
  • the invention has for its object to ensure with simple and captive means that the sanding plate can always be properly balanced with the sanding sheet used and without the temptation to refrain from balancing. It should even be possible to use not only sanding sheets of different designs, but also sanding plates with different structures and / or different sizes, without causing the machine to vibrate harmfully due to imbalances.
  • the counterweight comprises two identical adjustable bodies whose centers of gravity are arranged symmetrically to the axis of symmetry connecting the shaft axis and the eccentric axis of rotation.
  • the center of gravity of the two counterweights during rotation of the shaft result in a resulting radial force directed along the axis of symmetry, the size of which depends not only on the mass of the body itself, but also on its angular position with respect to the axis of symmetry of the arrangement.
  • the counterforce required to compensate for the imbalance which also generates a radial force coinciding with the axis of symmetry, can be set very precisely. Therefore, the invention offers the possibility, by changing the angular position of the adjustable body, to compensate for even small imbalances in the sanding plate with its sanding sheet. The adjustment of the body is possible without great effort, so that it is also made by the user of such a hand-held grinder, and the counterweights cannot be lost either because they generally remain connected to the machine and not for everyone Sanding disc special counterweights must be provided.
  • a particular advantage of the design of the hand grinder according to the invention is that the adjustable bodies do not have to form the counterweight alone, but also in addition to a body that is firmly connected to the shaft can find, the position and size of which is such that it compensates for the imbalance of a grinding plate of a given medium size.
  • the radial force exerted by this body, which is firmly connected to the shaft, can then not only be increased by the two adjustable bodies, but can also be reduced if the two adjustable bodies are located on the opposite side of the axis of rotation of the shaft with respect to the fixed body.
  • the adjustable bodies can be screwed into the shaft from the outside and a number of threaded bores can be arranged on the circumference of the shaft, which allow the screwing in of the bodies in several positions, from which the position best suited for compensation can be selected. It would also be conceivable to arrange several parallel rings of such threaded holes, which are intended for screwing in adjustable bodies of different sizes, of which the larger bodies allow a coarse adjustment, which enables the use of grinding plates of different sizes, while smaller screw-in bodies make fine adjustment to compensate Allow differences between sanding pads of the same type and / or to adapt to different sanding sheets.
  • a particularly simple embodiment of the invention which enables the bodies to be continuously adjusted, consists in that two adjusting rings with center of gravity eccentric to the shaft axis are arranged axially one behind the other on a cylindrical section of the shaft. Then, by simply turning and fixing the adjusting rings, the eccentric centers of gravity can be continuously distributed over the two sides of the symmetry axis mentioned at the outset so that the unbalance caused by the sanding plate with the sanding sheet is completely compensated for.
  • the adjusting rings used in this embodiment of the invention can be designed in very different ways.
  • such adjusting rings could be formed by tensioning straps, the tensioning devices of which form a concentrated mass which can be adjusted along the circumference of the shaft.
  • massive adjusting rings can be used, which have an approach that forms the adjustable eccentric mass on their outside. This approach can also be used to accommodate a radial set screw.
  • adjusting rings with a circular contour are used which have an eccentric bore.
  • Such collars are particularly easy to manufacture and have good stability.
  • the set screw for fixing the set rings can be arranged at the point where the set rings have the greatest wall thickness.
  • the adjusting rings can be provided with a scale that interacts with a reference mark attached to the outer surface of the shaft, or vice versa.
  • the scale can also denote the positions that the rings must theoretically have when using different sanding plates and / or sanding sheets.
  • sets of rings with different eccentric masses can compensate for the imbalance of different grinding discs on the one hand and different grinding wheels on the other.
  • a combination of collars and screw-in bodies is of course also possible.
  • the bores for the screw-in bodies could also be provided with markings which indicate the position in which these bodies are to be placed when using certain grinding plates and / or sanding sheets.
  • a preferred embodiment of the invention provides that the adjustable bodies and / or the shaft are provided with selected markings associated with the bodies.
  • the shaft has a central threaded bore at one end for receiving the threaded pin of a motor shaft and an eccentric recess at the other end, in which the bearing for the grinding plate is arranged.
  • an eccentric section with an enlarged diameter is arranged at the end of the shaft adjacent to the grinding plate, said section being directed opposite to the eccentric bearing for the grinding plate with respect to the axis of the shaft.
  • the adjustable bodies are arranged on the section of the shaft adjoining the eccentric section
  • a shaft 1 to 3 has a shaft 1, which is provided at one end with a concentric threaded bore 2, which allows the shaft 1 at the end of the motor shaft 3, which is only shown in broken lines in FIG. 1, to the hand grinder fasten.
  • a cylindrical recess 4 which is arranged eccentrically to the threaded bore 2.
  • the offset between the axis 5 of the shaft 1 and the axis 6 of the eccentric recess 4 is denoted by e in FIG. 1.
  • the grinding plate 7 is moved by the shaft 1 rotating about its axis 5 on a circular path with the radius e, without itself rotating about its axis 6, because the rotatable mounting of the grinding plate 7 in the recess 4 of the shaft 1 prevents it , which could transmit a torque to the sanding plate 7 that would be sufficient to overcome the forces opposing rotation of the sanding plate 7 that occur during grinding.
  • the end of the shaft 1 adjacent to the grinding plate 7 is provided with a section 21 of larger diameter in the illustrated embodiment, which is arranged eccentrically to the axis 5 of the shaft 1 in such a way that it causes an unbalance caused by the grinding plate 7 opposite radial force is generated.
  • the axis 22 of the section 21 is accordingly located on the side of the axis 5 of the shaft 1 opposite the axis 6 of the grinding plate 7 on the same straight line intersecting the axis 5 of the shaft 1, which forms an axis of symmetry 23 of the arrangement.
  • the shaft 1 has a section 24 of reduced diameter at its end facing away from the grinding plate, which is also arranged slightly eccentrically to the axis 5 of the shaft 1, but in the same sense as the grinding plate 7. This smaller section enables the shaft 1 to be manufactured fine tuning of the unbalance caused by the eccentric sections 21, 24 to a predetermined value.
  • the unbalance of the shaft 1 is adjusted in such a way that it compensates for the unbalance of a certain size and type of grinding plate 7 provided with a sanding sheet 12 as well as possible.
  • grinding discs of different designs depending on the grinding work to be performed, for example different sizes and / or different hardness and thus different masses.
  • sanding sheets with different backing material and different grain sizes, which can differ considerably in their mass.
  • the counterweight connected to shaft 1 does not only consist of section 21 with an enlarged diameter, but additionally comprises two adjustable bodies in the form of actuators rings 31, 32, which have a circular contour and an eccentric bore.
  • These adjusting rings 31, 32 are arranged axially one behind the other on the central, cylindrical section of the shaft 1. Because of their eccentric bore, they each have a center of gravity eccentric with respect to the axis 5 of the shaft 1, the position of which can be moved on a circular path concentric with the shaft axis 5 by rotating the adjusting rings 31, 32.
  • the two adjusting rings 31, 32 can be adjusted by means of adjusting screws 33, 34 penetrating them radially in any angular position to the shaft 1 and thus also to the axis of symmetry 23 connecting the shaft axis 5, the axis 6 of the grinding plate 7 and also the axis 22 of the eccentric extension 21 .
  • adjusting screws 33, 34 penetrating them radially in any angular position to the shaft 1 and thus also to the axis of symmetry 23 connecting the shaft axis 5, the axis 6 of the grinding plate 7 and also the axis 22 of the eccentric extension 21 .
  • a graduation 35, 36 which is opposite a line mark 37 on the circumference of the shaft 1 and a line mark 38 on the top of the eccentric section 21.
  • These marks 37, 38 lie in the plane defined by the axis of symmetry 23 and the shaft axis 5.
  • the scales 35, 36 attached to the circumference of the adjusting rings 31, 32 contain information about the positions which are assigned to certain grinding plates and / or grinding sheets. Furthermore, the scales facilitate a precisely symmetrical setting of the adjusting rings with respect to the axis of symmetry 23.
  • the bodies 41, 42 used instead of eccentric adjusting rings which can be rotated on the shaft are bodies which are fastened to the peripheral surface of the shaft 51 and which have threaded pins, not shown, on their end facing the shaft 51 which they are screwed into corresponding threaded bores 43, 44 which are distributed over the circumference of the shaft 51.
  • the bodies 41, 42 have such a different mass that moving the smaller bodies 42 over the entire range of variation of approximately 180 ° corresponds to moving the larger bodies 41 from one position to another, so that the choice of the position of both bodies makes them very fine Matching is possible, although these bodies can only be moved by discrete amounts.
  • the arrangement can also be such that the threaded bores 43 for the larger bodies 41 are assigned to different grinding plates, whereas the smaller bodies 42 can serve to compensate for the imbalances caused by the use of different grinding sheets.
  • the threaded bores 43, 44 are designated with markings 45, 46 in the form of numbers, letters and other symbols which allow the respective position of the screw-in bodies 41, 42 to be assigned to specific grinding plates and / or grinding wheels.
  • FIG. 6 shows the shaft 51 and the grinding plate 52 in a viewing direction perpendicular to the axis of symmetry 23 according to FIG. 4, similar to the section according to FIG. 1, so that only the bodies 41, 42 arranged on one side of the axis of symmetry in the plane of the drawing are visible are. It is therefore understood that the same arrangement of bodies 41, 42 is present on the rear side of the shaft 51, which is not visible in FIGS. 6 and 6, and care must be taken to ensure that the bodies 41 and 42, which are present in pairs, are symmetrical about the axis of symmetry mentioned to be ordered.
  • a hand grinder characterized in that the adjustable bodies (31, 32; 41, 42) and / or the shaft (1, 21) are provided with markings (35, 36, 37, 38 ; 41, 46) associated with selected positions of the bodies.
  • a hand grinder characterized in that the shaft (1) has at one end a central screw-threaded bore (2) to receive the threaded joumal of a motor shaft (3) and has atthe other end an eccentric recess (4) in which there is disposed a bearing arrangementforthe grinding plate (7) and, at the end adjacent the grinding plate (7), an eccentric portion (21) of enlarged diameter which, in relation to the axis ( 5) of the shaft (1), is directed in opposition to the eccentric bearing for the grinding plate (7) and in that the adjustable bodies (31, 32) are disposed on the portion of the shaft (1) adjacent the eccentric portion (21).

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)
  • Surgical Instruments (AREA)
  • Dry Shavers And Clippers (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
  • Liquid Crystal Substances (AREA)
  • Control And Other Processes For Unpacking Of Materials (AREA)
  • Heat-Pump Type And Storage Water Heaters (AREA)
  • High-Pressure Fuel Injection Pump Control (AREA)
  • Materials For Photolithography (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
  • Acyclic And Carbocyclic Compounds In Medicinal Compositions (AREA)
  • Nitrogen And Oxygen Or Sulfur-Condensed Heterocyclic Ring Systems (AREA)
  • Saccharide Compounds (AREA)
  • Testing Of Balance (AREA)
  • Power Steering Mechanism (AREA)
  • Valve Device For Special Equipments (AREA)
  • Lens Barrels (AREA)
  • Gyroscopes (AREA)
EP88112981A 1987-08-18 1988-08-10 Handschleifmaschine Expired - Lifetime EP0303955B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88112981T ATE63710T1 (de) 1987-08-18 1988-08-10 Handschleifmaschine.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3727487 1987-08-18
DE19873727487 DE3727487A1 (de) 1987-08-18 1987-08-18 Handschleifmaschine

Publications (2)

Publication Number Publication Date
EP0303955A1 EP0303955A1 (de) 1989-02-22
EP0303955B1 true EP0303955B1 (de) 1991-05-22

Family

ID=6333968

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88112981A Expired - Lifetime EP0303955B1 (de) 1987-08-18 1988-08-10 Handschleifmaschine

Country Status (13)

Country Link
EP (1) EP0303955B1 (enrdf_load_stackoverflow)
JP (1) JPH01135460A (enrdf_load_stackoverflow)
AT (1) ATE63710T1 (enrdf_load_stackoverflow)
AU (1) AU596026B2 (enrdf_load_stackoverflow)
BR (1) BR8804195A (enrdf_load_stackoverflow)
CA (1) CA1313309C (enrdf_load_stackoverflow)
DD (1) DD282194A5 (enrdf_load_stackoverflow)
DE (2) DE3727487A1 (enrdf_load_stackoverflow)
DK (1) DK459888A (enrdf_load_stackoverflow)
ES (1) ES2022553B3 (enrdf_load_stackoverflow)
GR (1) GR3002603T3 (enrdf_load_stackoverflow)
NO (1) NO883661L (enrdf_load_stackoverflow)
RU (1) RU1834788C (enrdf_load_stackoverflow)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5074723A (en) * 1989-04-13 1991-12-24 Kennametal Inc. Method and apparatus for balancing a rotary tool assembly
DE3942301C1 (enrdf_load_stackoverflow) * 1989-12-21 1991-02-14 Robert Bosch Gmbh, 7000 Stuttgart, De
JP3236169B2 (ja) * 1994-08-01 2001-12-10 株式会社リコー 定着装置
US6206771B1 (en) * 1999-01-25 2001-03-27 Dynabrade, Inc. Balancer for orbital abrading machine
US7022002B2 (en) 2004-03-03 2006-04-04 Dynabrade, Inc. Modular counterweight apparatus for an orbital abrading machine
DE102007018466A1 (de) 2007-04-19 2008-10-23 Robert Bosch Gmbh Motorisch angetriebene Werkzeugmaschine
DE102007062560A1 (de) * 2007-12-22 2009-06-25 J. Wagner Gmbh Flächenschleifmaschine
EP2127808A1 (en) * 2008-05-29 2009-12-02 Black & Decker, Inc. Power tool
CN104096671B (zh) * 2014-08-01 2016-06-15 吉首大学 便捷可调的偏心式振动装置
CN107457690B (zh) * 2017-08-31 2018-06-29 广州市永合祥自动化设备科技有限公司 研磨抛光机及其辅助机构
CN113601359B (zh) * 2021-08-30 2022-10-21 中电鹏程智能装备有限公司 一种砂纸自动夹持式柔性自动打磨装置
EP4534242A1 (en) * 2023-10-05 2025-04-09 Guido Valentini Eccentric element for use in a hand-held power tool

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2751725A (en) * 1954-08-13 1956-06-26 Roy J Champayne Orbital action rubbing machine
US3482362A (en) * 1966-01-28 1969-12-09 Ingersoll Rand Co Double acting sander head
DE1752453A1 (de) * 1968-05-29 1971-05-19 Miller Sanuel A Tragbare Poliermaschine
DE2745129A1 (de) * 1977-10-07 1979-04-12 Miksa Marton Exzenterkopf fuer eine handschleifmaschine
DE3517766A1 (de) * 1984-09-08 1986-03-20 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Schwingschleifer
DE8711895U1 (de) * 1987-08-18 1987-10-15 Marton, Miksa, Windsor, Ontario Handschleifmaschine

Also Published As

Publication number Publication date
AU596026B2 (en) 1990-04-12
DK459888A (da) 1989-02-19
ES2022553B3 (es) 1991-12-01
RU1834788C (ru) 1993-08-15
GR3002603T3 (en) 1993-01-25
NO883661D0 (no) 1988-08-17
BR8804195A (pt) 1989-03-14
AU2112088A (en) 1989-02-23
DE3727487A1 (de) 1989-03-02
CA1313309C (en) 1993-02-02
DE3727487C2 (enrdf_load_stackoverflow) 1989-05-24
NO883661L (no) 1989-02-20
EP0303955A1 (de) 1989-02-22
DK459888D0 (da) 1988-08-17
DE3862909D1 (de) 1991-06-27
DD282194A5 (de) 1990-09-05
JPH01135460A (ja) 1989-05-29
ATE63710T1 (de) 1991-06-15

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