EP0404133B1 - Schleifvorrichtung zum trockenen Flächenschleifen - Google Patents

Schleifvorrichtung zum trockenen Flächenschleifen Download PDF

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Publication number
EP0404133B1
EP0404133B1 EP90111701A EP90111701A EP0404133B1 EP 0404133 B1 EP0404133 B1 EP 0404133B1 EP 90111701 A EP90111701 A EP 90111701A EP 90111701 A EP90111701 A EP 90111701A EP 0404133 B1 EP0404133 B1 EP 0404133B1
Authority
EP
European Patent Office
Prior art keywords
grinding
housing
duct
holding
fan
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
EP90111701A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0404133A3 (de
EP0404133A2 (de
Inventor
Hans-Peter Barthelt
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.)
Festo SE and Co KG
Original Assignee
Festo SE and Co KG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Festo SE and Co KG filed Critical Festo SE and Co KG
Publication of EP0404133A2 publication Critical patent/EP0404133A2/de
Publication of EP0404133A3 publication Critical patent/EP0404133A3/de
Application granted granted Critical
Publication of EP0404133B1 publication Critical patent/EP0404133B1/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
    • B24B55/00—Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
    • B24B55/06—Dust extraction equipment on grinding or polishing machines
    • B24B55/10—Dust extraction equipment on grinding or polishing machines specially designed for portable grinding machines, e.g. hand-guided
    • B24B55/105—Dust extraction equipment on grinding or polishing machines specially designed for portable grinding machines, e.g. hand-guided with oscillating tools

Definitions

  • the invention relates to a grinding device for dry surface grinding with the features of the preamble of claim 1.
  • the generic orbital grinders known from practice contain in a housing a drive device for a flat grinding shoe which is elastically fastened to the housing.
  • a geared eccentric device arranged between the grinding shoe and the drive device, the grinding shoe is set into an orbital movement in which each point performs a circular movement of the same diameter.
  • the radius of this circle is small compared to the overall dimensions of the sanding shoe, which holds the abrasive in the form of sandpaper or sanding lies on its surface facing away from the housing.
  • the orbital sanders are equipped with a suction device that is effective on the outer edge of the sanding pad. It either contains a brush ring surrounding the grinding shoe, a vacuum being created within the brush ring with the aid of a blower, or vacuum located near the edge of the grinding shoe, which are connected to the suction side of the blower via channels contained in the grinding shoe.
  • this area of the sanding pad in which the pad made of sanding dust is located between the abrasive and the processed surface, is ineffective and makes no contribution to material removal.
  • the air used for this purpose can be part of the drive air in the case of a pneumatic drive or part of its cooling air in the case of an electric motor drive, which in most cases is cold enough even after flowing through the motor to achieve a cooling effect. In any case, it is able to blow the sanding dust away from the middle area under the sanding shoe, which does not require excessive static pressures.
  • FIG. 1 shows an orbital sander 1, in the housing 2 of which a drive device in the form of an electric or air pressure motor is arranged, which serves to set an abrasive shoe 3 elastically connected to the housing 2 in an oscillating movement relative to the housing 2 .
  • the housing 2 represents the fixed reference point and should remain as quiet as possible.
  • a motor shaft 4 of the drive device is rotatably mounted in a bearing flange 5 of the housing 2 by means of a radial groove ball bearing 6 sealed on both sides about an axis of rotation 7 which extends at right angles to a plane defined by the grinding shoe 3.
  • the oscillating movement of the grinding shoe 3 produces an eccentric 8, which is fixed in a rotationally fixed manner on the end of the motor shaft 4 protruding from the deep groove ball bearing 6 and has a cylindrical outer peripheral surface whose axis of symmetry 9 is radially offset with respect to the axis of rotation 7 of the motor shaft 4.
  • On the eccentric 8 is another radial deep groove ball bearing 11, which is pushed onto a shoulder 12 of the eccentric 8 until it rests.
  • the axis of symmetry 9 thereby forms the axis of rotation of the eccentric 8 in the grinding shoe 3, which is parallel to the axis of rotation 7.
  • the outer bearing ring of the deep groove ball bearing 11 is in a bearing seat 13 which is located in a dome-like attachment 14 of the grinding shoe 3.
  • the dome-like attachment is an integral part of a rigid plate-shaped upper part 10 and bulges towards the underside of the housing 2. It is located approximately in the middle above the grinding shoe 3.
  • On the flat underside of the plate 10 there is an elastic one Glued on the support plate 15, which forms a flat surface 16 that extends at right angles to the axis of rotation 7, on which, when using the orbital sander 1, the non-illustrated sanding paper or abrasive fleece, which form the actual abrasive, is held.
  • the fastening devices for holding the sanding paper or sanding fleece are omitted for the sake of clarity.
  • the eccentric 8 is axially secured on the output shaft by means of a countersunk screw 17 which is screwed into a coaxial threaded bore 19 of the output shaft 4 with the interposition of a washer 18.
  • the washer 18 forms the contact surface for the bottom end face of the eccentric 8 or the balancing weight.
  • a suction device 25 which has a radial fan 27 arranged in a chamber 26 and seated in a rotationally fixed manner on the motor shaft 4.
  • the radial fan 27 forms, together with the chamber 26, a blower, the pressure side of which is connected via channels (not shown) to a connection 28 protruding from the housing 2 for a filter bag (not shown).
  • the suction side of the blower formed by the radial fan 27 and the chamber 26 is connected via an elastic hose 29 to a channel system 31 inside the grinding shoe 3.
  • the elastic hose 29 sits at one end on an unrecognizable socket of the housing 2 and on a likewise invisible socket on the top of the plate 10 and is secured by means of hose clips 32, 33.
  • the channel system 31 is located between the plate 10 and the underside 16 and connects an opening 34 in the plate 10 to the hose 29 with the channel system 31.
  • the channel system 31 consists essentially of two branches 35 and 36, which are parallel to the two longer sides run and open into a total of six through holes 37 which connect the channel system 31 to the underside 16.
  • a flat rounded groove 38 leads in the shortest possible way directly to an adjacent side edge 39 or 41 of the grinding shoe 3. In this way, not only is the grinding dust located below the underside 16 near the holes 37, but also that Dust located next to the grinding shoe 3 is sucked in and conveyed by the radial fan 27 to the filter bag connected to the connecting piece 28.
  • the opening 44 is surrounded by a nozzle on which a further elastic hose 45 is attached.
  • the hose 45 connects the duct 43 to the pressure side of a further blower 46, which contains a radial fan 47, which is also non-rotatably seated on the motor shaft 4.
  • the radial fan 47 is separated from the radial fan 27 in terms of flow and, moreover, serves to convey cooling air through the motor of the orbital sander 1.
  • the air emerging on the pressure side of the blower 46 is partly blown outside and partly reaches the underside 16 via the hose or channel 45, which is shown in broken lines. To illustrate these relationships, there is an opening next to the radial fan 47 48 of the channel 45 schematically illustrated.
  • the blow-out opening 42 thus effectively prevents the formation of a cushion of grinding dust in a central area between the suction openings 37.
  • the central area which is located between the two rows of suction openings 37 lying next to one another in parallel, is in this way inevitably kept free of grinding dust and can make its contribution to material removal, which would not be possible if sanding dust accumulates at this point and lifts the abrasive off the surface to be machined.
  • the abrasive paper or abrasive fleece has at least one opening aligned with the opening 42 so that the blown-in air can get between the abrasive and the surface to be processed.
  • the constant escape of air from the opening 42 is undesirable, for example when heavily curved surfaces are machined, or the orbital sander is inclined on the surface to be machined for the purpose of increased material removal.
  • the cushion of grinding dust occurring between the two rows of suction openings can also be effectively removed.
  • the channel 43 is not extended to the pressure side of the blower 46, but opens into a channel 49 which opens on a side surface of the grinding shoe 3.
  • the suction openings 37 located at the edge of the grinding shoe 3 are able to generate an air flow in the central region of the underside 16, which is directed towards the suction openings 37.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding-Machine Dressing And Accessory Apparatuses (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
EP90111701A 1989-06-20 1990-06-20 Schleifvorrichtung zum trockenen Flächenschleifen Expired - Lifetime EP0404133B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3920021A DE3920021C1 (es) 1989-06-20 1989-06-20
DE3920021 1989-06-20

Publications (3)

Publication Number Publication Date
EP0404133A2 EP0404133A2 (de) 1990-12-27
EP0404133A3 EP0404133A3 (de) 1991-05-02
EP0404133B1 true EP0404133B1 (de) 1994-04-13

Family

ID=6383071

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90111701A Expired - Lifetime EP0404133B1 (de) 1989-06-20 1990-06-20 Schleifvorrichtung zum trockenen Flächenschleifen

Country Status (2)

Country Link
EP (1) EP0404133B1 (es)
DE (2) DE3920021C1 (es)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1186379A2 (en) 2000-09-07 2002-03-13 Tholes srl Device for surface grinding and sanding
US7081046B2 (en) 2003-12-03 2006-07-25 Watson Adam Dewain Sanding machine supporting removable side extensions
US7112127B2 (en) 2003-12-03 2006-09-26 Watson Adam Dewain Joint compound sander

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5833524A (en) * 1994-08-22 1998-11-10 Ryobi Limited Dust collection system for a power tool
US6039639A (en) * 1997-02-27 2000-03-21 Robert Bosch Gmbh Motor driven hand tool with improved elastic supporting members connecting an oscillating work tool carrier with the tool housing
DE19941620A1 (de) 1999-09-01 2001-03-08 Bosch Gmbh Robert Handwerkzeugmaschine
ES2199013B1 (es) * 2001-03-13 2005-05-16 Carlos A. Martinez Rodilla Procedimiento para el tratamiento de la madera, corcho linolium y hormigon.

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3866304A (en) * 1972-08-21 1975-02-18 Alma A Hutchins Method of piercing air suction holes in abrasive sheet material
US3906682A (en) * 1974-08-15 1975-09-23 Melvin Glasser Sander with dust prevention means
EP0244465B1 (de) * 1985-11-15 1989-08-02 C. & E. FEIN GmbH & Co. Handschleifgerät

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1186379A2 (en) 2000-09-07 2002-03-13 Tholes srl Device for surface grinding and sanding
US7081046B2 (en) 2003-12-03 2006-07-25 Watson Adam Dewain Sanding machine supporting removable side extensions
US7112127B2 (en) 2003-12-03 2006-09-26 Watson Adam Dewain Joint compound sander

Also Published As

Publication number Publication date
EP0404133A3 (de) 1991-05-02
DE3920021C1 (es) 1990-05-17
DE59005318D1 (de) 1994-05-19
EP0404133A2 (de) 1990-12-27

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