EP0559020B1 - Ponceuse à plateau excentrique avec vitesse de rotation limitée - Google Patents

Ponceuse à plateau excentrique avec vitesse de rotation limitée Download PDF

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Publication number
EP0559020B1
EP0559020B1 EP93102636A EP93102636A EP0559020B1 EP 0559020 B1 EP0559020 B1 EP 0559020B1 EP 93102636 A EP93102636 A EP 93102636A EP 93102636 A EP93102636 A EP 93102636A EP 0559020 B1 EP0559020 B1 EP 0559020B1
Authority
EP
European Patent Office
Prior art keywords
eccentric
grinding disc
disc
connecting piece
tube connecting
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
EP93102636A
Other languages
German (de)
English (en)
Other versions
EP0559020A1 (fr
Inventor
Steffen Dipl.-Ing. Wünsch
Claus Dipl.-Ing. Kemmner
Karl-Heinz Dipl.-Ing. Braunbach
Klaus Wurst
Thomas Palaver
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0559020A1 publication Critical patent/EP0559020A1/fr
Application granted granted Critical
Publication of EP0559020B1 publication Critical patent/EP0559020B1/fr
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
    • 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 disc grinder according to the preamble of claim 1.
  • Such an eccentric disc grinder is known from WO-A-90/09869.
  • the known eccentric disc grinder with friction brake have the disadvantage that the brake friction constantly acts on the grinding disc. Due to the power of the drive motor required to overcome the braking force, the efficiency of the eccentric disc grinder is relatively low. The motor power is never fully usable for the grinding process because part of the drive energy is constantly converted into heat.
  • the braking force acting on the grinding disc cannot be increased, so that a single machining step is determined with the help of the brake. Different processing stages cannot be set using the brake.
  • an eccentric grinder with a ring arranged on its grinding plate is known, which is supported on the housing of the eccentric grinder and serves as a friction wheel for generating a forced rotation of the grinding plate during its eccentric circular movement.
  • This ring also acts as a high-speed brake, which prevents the grinding plate from turning up unintentionally to the idle speed of the machine drive.
  • This ring cannot be variably adjusted with regard to its braking effect.
  • the eccentric disc grinder according to the invention with the characterizing features of claim 1 has the advantage that the braking force acting on the grinding plate can be repeatedly and precisely set variably, that different processing stages from fine sanding to coarse sanding can be set by changing the braking force and that at least in one machining step the drive energy is fully available for the grinding work.
  • This solution is structurally particularly simple and robust with little additional weight compared to the prior art.
  • FIG. 1 shows an eccentric disc grinder with a hose-like, adjustable braking means
  • the eccentric disc grinder 1 shown in Figure 1 consists of a housing 3 with a handle 5, in which an on and off switch 7 is arranged.
  • a motor 9 with an output shaft 13 rotating about a shaft axis 11 is arranged in the interior of the housing 3.
  • the eccentric carrier 15 and thus at the same time the free end of the output shaft 13 is rotatably mounted in a roller bearing 17 in the gear housing 3.
  • An eccentric pin 19 is mounted in the eccentric carrier 15 by an amount "e" to the axis 11 and is rotatably mounted about its own axis 21 in a further roller bearing 23.
  • a grinding plate 25 is arranged in a rotationally fixed manner on the eccentric pin 19, held by a screw 27 which passes through the grinding plate 25 and is screwed into a threaded bore 29 of the eccentric pin 19.
  • a hose connector 31 is arranged in a manner fixed against rotation and immovably, which with its inner radial surface 32 touches the grinding plate 25 on a grinding plate collar 33.
  • the hose connector 31 is arranged concentrically to the shaft axis 11, its surface 32 being located at the geometric location of the circular path which the grinding plate collar 33 describes when the drive shaft 13 rotates.
  • the hose connector 31 is tightly encompassed by a ring 35 on the outside.
  • the ring 35 is arranged displaceably along the hose connector 31.
  • a rotary knob 37 which is arranged transversely to the direction of displacement in the housing 3, the ring 35 can be axially adjusted via engagement by means of an eccentric (not specified) and held in its respective position.
  • the braking effect can be varied in the following way: after starting the motor 9 by actuating the on / off switch 7, the grinding plate 25 is forced into a circular path concentric with the shaft axis, the grinding plate 25 rotating about its axis 21 due to the friction in the further rolling bearing 23 begins. The circular movement and the rotation overlapped each other.
  • the braking force of the hose connector 31 on the grinding plate 25 is relatively low. If the ring 35 is in the position shown close to the grinding plate, the braking force of the hose connector 31 on the grinding plate 25 or its collar 33 is significantly increased. As a result, the grinding plate can be braked to such an extent that there is a rolling movement on the inner surface 32 of the hose connector 31, and the grinding plate, as a result of the rolling of the grinding plate collar 33 on the hose connector 31, performs a controlled, powerful self-rotation with which a maximum removal rate, the working position " rough ", is fulfilled.
  • positions of the ring 35 between the two end positions can be varied continuously between rough and fine sanding.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)

Claims (8)

  1. Ponceuse orbitale comprenant un boîtier (3) logeant un moteur (9) qui entraîne par un arbre de sortie (13) un plateau de ponçage (25), l'arbre moteur (13) étant couple solidairement en rotation à un support d'excentrique (15) portant un tourillon d'excentrique (19) qui tourne notamment dans un palier de roulement (23) avec un certain frottement de position autour de son axe (21), et couplé avec une certaine excentricité (e) à l'arbre de sortie (13) et solidaire en rotation au plateau tournant (25) pour que celui-ci tourne avec l'excentricité (e) autour de l'axe (11) de l'arbre de sortie (13) et que du fait du frottement du palier en même temps autour de l'axe (21) du tourillon d'excentrique (19), des moyens de freinage (31, 33) limitant la vitesse de rotation du plateau de ponceuse (25) pour un plateau de ponceuse (25) qui ne s'appuie pas ou très peu sur la pièce,
    caractérisée en ce que
    le moyen de freinage est réalisé sous la forme d'un ajutage tubulaire (31) dont les extrémités libres sont réglables pour limiter le frottement en étant appuyées contre le plateau (25) et le manchon (31) est appuyé par des moyens d'appui (35) coulissant parallèlement à son axe longitudinal, et avec une rigidité réglable contre la surface antagoniste (33) du plateau de ponceuse (25).
  2. Ponceuse orbitale selon la revendication 1,
    caractérisée en ce que
    le manchon (31) est essentiellement solidaire en rotation dans le boîtier (3) concentriquement au plateau de ponceuse (25) et peut toucher le plateau (25).
  3. Ponceuse orbitale selon la revendication 1 ou 2,
    caractérisée en ce que
    le manchon (31) coupe ou touche au moins une surface (32) de la périphérie de la trajectoire sur laquelle se déplace la surface antagoniste (33) du plateau de ponceuse (24).
  4. Ponceuse orbitale selon l'une des revendications précédentes,
    caractérisée en ce que
    le manchon (31) touche avec une surface radiale ou axiale (32), une surface antagoniste radiale ou axiale (33) du plateau (25).
  5. Ponceuse orbitale selon la revendication,
    caractérisée en ce que
    les moyens d'appui (35) entourent étroitement le manchon (31) et sont réalisés notamment sous la forme d'une bague pour servir à régler la rigidité du manchon (31).
  6. Ponceuse orbitale selon l'une des revendications,
    caractérisée en ce qu'
    une zone en forme de collerette du plateau de ponceuse (25) porte la surface antagoniste (33).
  7. Ponceuse orbitale selon la revendication 5,
    caractérisée en ce que
    le moyen d'appui (35) est monté radialement de manière élastique.
  8. Ponceuse orbitale selon l'une des revendications précédentes,
    caractérisée en ce que
    le manchon (31) comporte des passages de ventilation et d'aération du plateau (25).
EP93102636A 1992-03-05 1993-02-19 Ponceuse à plateau excentrique avec vitesse de rotation limitée Expired - Lifetime EP0559020B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4206962A DE4206962A1 (de) 1992-03-05 1992-03-05 Exzentertellerschleifer mit begrenzter drehzahl des schleiftellers
DE4206962 1992-03-05

Publications (2)

Publication Number Publication Date
EP0559020A1 EP0559020A1 (fr) 1993-09-08
EP0559020B1 true EP0559020B1 (fr) 1997-10-15

Family

ID=6453303

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93102636A Expired - Lifetime EP0559020B1 (fr) 1992-03-05 1993-02-19 Ponceuse à plateau excentrique avec vitesse de rotation limitée

Country Status (2)

Country Link
EP (1) EP0559020B1 (fr)
DE (2) DE4206962A1 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4233729A1 (de) * 1992-10-07 1994-04-14 Bosch Gmbh Robert Exzentertellerschleifer mit Schleiftellerbremse
US5392568A (en) * 1993-12-22 1995-02-28 Black & Decker Inc. Random orbit sander having braking member
US5580302A (en) * 1994-02-28 1996-12-03 Black & Decker Inc. Random orbit sander having air directing baffle
US5885146A (en) * 1995-12-06 1999-03-23 Black & Decker Inc. Oscillating hand tool
JP3316622B2 (ja) * 1996-03-08 2002-08-19 株式会社マキタ サンダ
DE19963831B4 (de) * 1999-12-30 2006-04-06 Robert Bosch Gmbh Exzentertellerschleifer mit einem Gehäuse
DE10031761A1 (de) * 2000-06-29 2002-01-10 Bosch Gmbh Robert Exzentertellerschleifmaschine mit einem zylindrischen Gehäuse
DE10055246A1 (de) * 2000-11-08 2002-05-16 Bosch Gmbh Robert Exzenterschleifer mit einer Vorrichtung zur Drehzahlbegrenzung des Schleiftellers
CN107225477A (zh) * 2017-06-06 2017-10-03 浙江亚特电器有限公司 一种使用安全的圆砂机

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5018314A (en) * 1989-06-08 1991-05-28 Makita Electric Works, Ltd. Sander

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3625655C1 (de) * 1986-07-29 1988-01-07 Festo Kg Exzentertellerschleifer
DE3906549A1 (de) * 1989-03-02 1990-09-06 Bosch Gmbh Robert Exzenterschleifer

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5018314A (en) * 1989-06-08 1991-05-28 Makita Electric Works, Ltd. Sander

Also Published As

Publication number Publication date
DE59307524D1 (de) 1997-11-20
EP0559020A1 (fr) 1993-09-08
DE4206962A1 (de) 1993-09-09

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