EP0329943B1 - Tellerschleifmaschine - Google Patents

Tellerschleifmaschine Download PDF

Info

Publication number
EP0329943B1
EP0329943B1 EP89100838A EP89100838A EP0329943B1 EP 0329943 B1 EP0329943 B1 EP 0329943B1 EP 89100838 A EP89100838 A EP 89100838A EP 89100838 A EP89100838 A EP 89100838A EP 0329943 B1 EP0329943 B1 EP 0329943B1
Authority
EP
European Patent Office
Prior art keywords
disc
grinding
machine according
hood
grinding machine
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
EP89100838A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0329943A3 (de
EP0329943A2 (de
Inventor
Karl Attinger
Peter Maier
Wolfgang Kuch
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
Priority to AT89100838T priority Critical patent/ATE83185T1/de
Publication of EP0329943A2 publication Critical patent/EP0329943A2/de
Publication of EP0329943A3 publication Critical patent/EP0329943A3/de
Application granted granted Critical
Publication of EP0329943B1 publication Critical patent/EP0329943B1/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
    • B24B55/102—Dust extraction equipment on grinding or polishing machines specially designed for portable grinding machines, e.g. hand-guided with rotating tools

Definitions

  • the invention relates to a disc grinding machine with a grinding disc driven by a drive shaft for a rotational movement and a dust extraction device which has a dust extraction hood surrounding the grinding disc and containing a suction space, the hood body of which ends above the bottom surface of the grinding disc, with a workpiece on the underside of the hood body attachable bristle ring or the like.
  • a plate grinder equipped with such a dust extraction hood has a like or the like compared to a suction hood with a completely surrounding bristle ring.
  • the present invention is therefore based on the object to provide a disc grinding machine of the type mentioned, in which, despite the bristle ring or the like which does not extend over the entire circumference. the grinding dust generated during workpiece machining is extracted much better than since then. This should be achieved with measures that are as simple and inexpensive to manufacture as possible.
  • the inside of the suction hood is sealed as possible from the outside, since the inside of the hood is only on front end of the suction gap, where the bristle ring or the like. is opposite the grinding plate circumference at a relatively large distance, and is connected to the outside atmosphere on the underside over the length of the suction gap.
  • false air cannot enter anywhere, and the suction force is concentrated on the suction gap and on the front end when the grinding disc is placed on the workpiece.
  • the machine Since the machine is regularly attached to the workpiece in such a way that the front, open end of the suction gap is located next to and slightly behind the processing point when viewed in the direction of rotation, the sanding dust flung away in the direction of the front end of the suction gap is strong and therefore safe sucked in. Once the grinding dust is sucked in, it can no longer escape from the inside of the hood because of the seal according to the invention.
  • the plate grinding machine which is designed as a hand-held device, is a so-called angle grinder.
  • the elongated machine housing 1 comprises a motor part 2 containing the drive motor and a machine head 3, in which a deflection gear is arranged and from which extends below the drive shaft 4, which runs at right angles to the longitudinal direction of the housing and drives a circular grinding plate 5 for a rotational movement.
  • the sanding plate 5 is made of abrasive material or is provided with an abrasive coating and is regularly held obliquely against the workpiece to be machined, so that it only engages this over a relatively small circumferential angle.
  • This angle grinder is held with both hands.
  • a handle 6 which projects laterally in the direction from the machine housing 1 and is attached approximately above the grinding plate 5.
  • the grinding plate 5 can be pressed against the workpiece by means of this handle.
  • the other hand can, for example, encompass the elongated machine housing 1, for which purpose this can be designed to be within easy reach.
  • a dust extraction device which has a dust extraction hood 7 surrounding the grinding plate 5 with a hood body 8.
  • the suction hood 7 overlaps the grinding plate circumference and covers the upper side of the grinding plate at a distance, so that a suction space 9 is present in the interior of the hood above the grinding plate 5.
  • the suction hood 7 also has a suction nozzle 10 attached to the hood body 8, which in the exemplary embodiment is arranged on the top of the hood body 8 and projects approximately in the tangential direction.
  • the suction nozzle 10 is in open connection with the suction chamber 9.
  • a vacuum cleaner or a dust bag can be connected to the suction nozzle 10.
  • a blower not shown, is used to generate the suction flow and can be arranged externally or also inside the machine, for example in the form of a blower wheel located on the drive shaft 4 and located in the suction path.
  • the hood body 8 ends at the bottom above the grinding plate underside 11, with a bristle ring 13 or the like from the underside of the hood body 8. (it could also be a ring of plastic knobs or a sealing lip made of resilient material) that can be placed on the workpiece.
  • the bristle ring 13 or the like. runs along leaving only a part of the circumference of the grinding plate 5, leaving a visible area towards the workpiece, as can be seen above all from FIG. 3, in which the bristle ring is shown in dotted lines.
  • the bristle ring 13 or the like. also forms, with the facing peripheral region 14 of the grinding plate 5, a suction gap 15 which faces the workpiece, i.e. below, is open.
  • the suction gap 15 is also open at the front end 16 seen in the direction of rotation 16 of the grinding plate 5.
  • the suction gap 15 means only the gap or the like between the bristle ring 13. and the grinding plate circumference is formed and has a gap height reaching to the underside 12 of the hood body 8.
  • the machine is regularly held so that the grinding plate area 17 located in front of the side handle 6 processes the workpiece.
  • the front in the circumferential direction open end 16 of the suction gap 15, where the distance between the bristle ring 13 or the like. and the grinding plate circumference is relatively large, is located next to the workpiece processing point and mostly seen behind this in the direction of rotation 16.
  • the grinding dust is therefore thrown to the open end 16 of the suction gap 15 and also sucked in with great force so that it is sucked through the suction gap 15 past the grinding plate circumference 14 into the suction chamber 9.
  • the suction gap 15 is radially outward through the bristle ring 13 or the like. sealed.
  • the bristle ring 13 or the like. furthermore forms a rear seal of the suction gap 13 by the rear end 18 of the bristle ring 13 or the like, viewed in the direction of rotation 16. runs to the grinding plate circumference 14. It is advantageously provided that the bristle ring 13 or the like. Starting from the front end 16 to the rear end 18 extends spirally towards the grinding plate circumference 14, so that the suction gap 15 tapers continuously in the direction of rotation 16 of the grinding plate 5. While at the front end 16 of the bristle ring 13 or the like. thus begins with a relatively large distance from the grinding plate circumference, the bristle ring 13 or the like. at the rear end 18 as close as possible to the periphery of the grinding plate.
  • the hood body 8 also has an over the bristle ring 13 or the like. Free angular range ⁇ extending sealing portion 19 which is opposite to the grinding plate 5 with the sealing distance allowing the grinding plate rotation.
  • the sealing section 19, as will be explained in more detail below, is an integral part of the hood body 8. However, it could also be a brush, lip or the like carried by the hood body 8. be.
  • the sealing section may not necessarily seal against the circumference of the grinding plate, as in the exemplary embodiment, but also against the upper side of the grinding plate.
  • the suction chamber 9 can be seen from the sealing distance of the sealing section which permits the grinding plate rotation and from the possibly small distance between the grinding plate circumference and the rear bristle ring end, with the surroundings only via the suction gap 15 which is open at the front and at the bottom and in the exemplary embodiment tapers in a wedge shape connected so that no false air can be sucked in and the suction effect is completely concentrated on the suction gap 15.
  • the sealing part 19 is expediently formed by an annular wall region 20 of the hood body 8 which runs along the circumference of the grinding plate parallel to this circular arc and is opposite the grinding plate circumference with a sealing distance.
  • This ring wall area 20 thus extends downward over the circumference of the grinding plate, it ending below slightly above the underside 11 of the grinding plate. Since the grinding plate circumference tapers upwards like a truncated cone and the ring wall region 20 ends above the grinding plate underside 11 close to the grinding plate circumference, the ring wall region 20 does not protrude, or scarcely, radially beyond the grinding plate circumference.
  • the ring wall area 20, like the circumference of the sanding disc, can taper conically upwards.
  • the arrangement is preferably such that the hood body 8 has a partial annular body 21 which projects radially beyond the grinding plate 5 and extends along the grinding plate circumference 14, on the underside of which the bristle ring 13 or the like. is arranged. It is expedient for the inside 22 of the partial ring body 21 facing the grinding plate to run parallel or parallel to the bristle ring 13 or the like, preferably in a spiral shape, and for the outer boundary of a suction gap 23 to form a continuation of the suction gap 15.
  • the suction gap 23 thus follows the suction gap 15 when viewed in the height direction, wherein it has the same longitudinal profile in the circumferential direction as this.
  • the partial ring body 21, like the rest of the ring wall region 20, projects above the grinding plate circumference, the suction gap 23 delimited by it outside and by the grinding plate inside being closed off at the top by an upper wall 24 of the partial ring body.
  • the partial ring body 21 has a holding groove 25 open on its underside for inserting a bristle ring 13 or the like. having strip body 26. In this way, the bristle ring 13 or the like. can be easily replaced when it is worn. One then only needs to pull out the strip body 26 carrying the bristle ring and exchange for a new one.
  • the partial ring body is double-walled, the space between the inner wall 27 and the outer wall 28 representing the retaining groove 25.
  • load-bearing partial ring bodies 21 form an annular wall that runs continuously around the grinding plate, the partial ring body 21 being radially offset.
  • the underside of the ring wall is flat and forms the underside of the hood body 12.
  • the inside 29 of the annular wall region 29 forming the sealing part 19 can be provided at the front end 16 of the bristle ring 13 or the like. pass into the inside 22 of the partial ring body 21 via an essentially radially outwardly directed shoulder 30.
  • the shoulder 30 is formed by a wall web 31 of the partial ring body 21 which delimits the suction gap 23 at the front end 16.
  • the inside 22 of the partial ring body 21 expediently merges substantially continuously into the inside 29 of the ring wall region 20 forming the sealing part 19, so that there is no or only an insignificant dead corner here.
  • the suction hood 7 can be arranged fixed on the machine housing 1. Appropriately, however, it is detachably attached.
  • its hood body 8 can have a cylindrical push-on sleeve 33 on the top, which is attached to a cylindrical housing projection 34 (only indicated by dashed lines) coaxial with the drive shaft 4.
  • the releasable fastening can be carried out by clamping, for example by means of a clamping screw 35, which is only indicated by dash-dotted lines in FIG. 2.
  • hood body 8 in an attached to the machine housing and thereby preferably detachably attached upper part 36 and in a bristle ring 13 or the like. and the sealing part 19 having lower part 37 is divided, the lower part 37 being rotatably mounted on the upper part 36. You can then turn the lower part 37 in an angular position favorable for the respective machining process, so that the front end 16 at the machining point is.
  • the rotatability of the bristle ring 13 or the like. is not absolutely necessary, however, since angle grinders of this type are held in the same way against the workpiece in most applications.
  • the rotatable mounting of the lower part 37 can take place by means of a bearing ring 38, which engages behind an inward ring projection 39 of the lower part 37 which rests upward against the underside of the upper part 36 and is screwed to the upper part.
  • the handle 6 projecting laterally in the direction away from the machine housing can be a rotary handle which is in a driving connection with the lower part via a gear.
  • the handle 6, which has an elongated shape and is directed transversely to the drive shaft 4 of the grinding plate 5 screwed onto it, can thus be rotated about its own axis, with the lower part 37 of the hood also rotating. In this way, with the hand holding the handle 6 during grinding the bristle ring 13 or the like. be brought to the most convenient location for dust extraction.
  • the transmission is expediently a gear transmission.
  • the rotary handle 6 carries at its machine-side end a coaxial gear 40 which is in engagement with a ring gear 41 arranged on the lower part 37 of the hood.
  • the gear wheel 40 is arranged on a larger diameter than the disk body 42 having the rotary handle 6.
  • the hood lower part 37 protrudes radially above the hood upper part 36 and carries the ring gear 41 in the projecting area.
  • the rotary handle 6 is expediently arranged on the hood upper part 36 and can be mounted on a bearing block 43 which stands up from the upper part 36.

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)
  • Polishing Bodies And Polishing Tools (AREA)
EP89100838A 1988-02-25 1989-01-19 Tellerschleifmaschine Expired - Lifetime EP0329943B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89100838T ATE83185T1 (de) 1988-02-25 1989-01-19 Tellerschleifmaschine.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3805962 1988-02-25
DE3805962A DE3805962A1 (de) 1988-02-25 1988-02-25 Tellerschleifmaschine

Publications (3)

Publication Number Publication Date
EP0329943A2 EP0329943A2 (de) 1989-08-30
EP0329943A3 EP0329943A3 (de) 1991-03-20
EP0329943B1 true EP0329943B1 (de) 1992-12-09

Family

ID=6348176

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89100838A Expired - Lifetime EP0329943B1 (de) 1988-02-25 1989-01-19 Tellerschleifmaschine

Country Status (6)

Country Link
US (1) US4899495A (es)
EP (1) EP0329943B1 (es)
JP (1) JPH01246075A (es)
AT (1) ATE83185T1 (es)
DE (2) DE3805962A1 (es)
ES (1) ES2035960T3 (es)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5518442A (en) * 1993-01-22 1996-05-21 Porter-Cable Corporation Sander
DE4306009C2 (de) * 1993-02-26 1996-05-09 Fein C & E Absaugeinrichtung für eine Flächenschleifmaschine
US5941765A (en) * 1996-11-19 1999-08-24 Porter Cable Corporation Sander
US7896041B2 (en) * 2007-02-02 2011-03-01 Rockler Companies, Inc. Dust collection attachment
DE102008024801A1 (de) 2008-05-23 2009-11-26 INOTEC GmbH Transport- und Fördersysteme Handwerkzeug zur materialabtragenden Bearbeitung einer Werkstück- oder Bauteiloberfläche
DE102008054489A1 (de) 2008-12-10 2010-06-17 Hilti Aktiengesellschaft Werkzeugsystem
USD906079S1 (en) * 2019-04-18 2020-12-29 Skitter & Squirt Adventures, Llc Grinder shroud
USD906078S1 (en) * 2019-04-18 2020-12-29 Skitter & Squirt Adventires, LLC Grinder shroud
USD906077S1 (en) * 2019-04-18 2020-12-29 Skitter & Squirt Adventures, Llc Grinder shroud
USD911805S1 (en) * 2019-05-28 2021-03-02 Zhejiang Yongkang Moyi Tools Co., Ltd Grinder shroud
CN113245299B (zh) * 2021-05-13 2023-11-21 江阴华新精密科技股份有限公司 一种电机铁芯除尘设备及除尘方法
CN113894666A (zh) * 2021-10-11 2022-01-07 北京汽车集团越野车有限公司 一种打蜡抛光设备

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2152352A (en) * 1937-10-19 1939-03-28 William E Holt Electric surfacing tool
US3334448A (en) * 1964-03-20 1967-08-08 Rockwell Mfg Co Spindle lock for a power tool
US3673744A (en) * 1971-02-12 1972-07-04 Anders Oimoen Portable grinder
AU472778B2 (en) * 1973-06-08 1976-06-03 Clarkson Industries Inc Dust collector for portable rotary disc grinder
GB1462156A (es) * 1974-09-24 1977-01-19 Kungalv Tryckluftmask Ab
DE3670027D1 (de) * 1985-09-20 1990-05-10 Festo Kg Rotationsschleifgeraet mit staubabsaugvorrichtung.
DE3615799C2 (de) * 1986-05-10 1994-10-13 Bosch Gmbh Robert Exzenterschleifer mit einer Vorrichtung zum Verändern der Schleifbewegung
US4765099A (en) * 1986-12-11 1988-08-23 Tanner John G Sanding and dust collecting apparatus

Also Published As

Publication number Publication date
US4899495A (en) 1990-02-13
ATE83185T1 (de) 1992-12-15
EP0329943A3 (de) 1991-03-20
EP0329943A2 (de) 1989-08-30
DE58902920D1 (de) 1993-01-21
JPH01246075A (ja) 1989-10-02
DE3805962A1 (de) 1989-09-07
ES2035960T3 (es) 1993-05-01

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