EP0300180B1 - Disk wheel grinder - Google Patents

Disk wheel grinder Download PDF

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Publication number
EP0300180B1
EP0300180B1 EP88109006A EP88109006A EP0300180B1 EP 0300180 B1 EP0300180 B1 EP 0300180B1 EP 88109006 A EP88109006 A EP 88109006A EP 88109006 A EP88109006 A EP 88109006A EP 0300180 B1 EP0300180 B1 EP 0300180B1
Authority
EP
European Patent Office
Prior art keywords
grinder according
disc
hood
disc grinder
suction
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
EP88109006A
Other languages
German (de)
French (fr)
Other versions
EP0300180A1 (en
Inventor
Karl Attinger
Wolfgang Kuch
Peter Maier
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 AT88109006T priority Critical patent/ATE58858T1/en
Publication of EP0300180A1 publication Critical patent/EP0300180A1/en
Application granted granted Critical
Publication of EP0300180B1 publication Critical patent/EP0300180B1/en
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
    • 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

Definitions

  • the invention relates to a plate grinding machine designed as a hand-held device, with a grinding plate driven by a drive shaft for a rotational movement, a handle projecting laterally in the direction away from the machine housing, and a dust extraction device which has a suction space that covers the upper side of the grinding plate by a distance and spans the circumference of the grinding plate and the suction hood fixed to the machine housing with a bristle ring or the like seated on a workpiece. has on the underside, wherein the bristle ring extends only a part of the circumference of the suction hood while leaving a visible area to the workpiece, and wherein the grinding dust or the like between the grinding plate circumference and the bristle ring. through to the suction chamber.
  • the present invention is therefore based on the object to provide a disc grinder of the type mentioned, in which a bristle ring or the like. unhindered machining of workpieces with any sanding pad area is possible, without the dust extraction suffering as a result.
  • the measures required for this should be as simple as possible and easy to use.
  • suction hood rotatably arranged on the connecting part to the machine housing of the suction hood independently of the grinding plate and the like or the bristle ring. contains supporting lower part and that the handle is a twist grip which is drivingly connected to the lower part of the suction hood via a gear.
  • the grinding plate circumference is only partially or the like through the bristle ring. covered. Since this can be rotated around the sanding plate together with the lower part of the hood, it can be rotated into the circumferential position where the dust is generated, so that the sanding plate can be attached to the workpiece in any position and always has good dust extraction.
  • the processing point is visible and you get the further advantage that you can use the grinding plate or the like in workpiece joints. can get to practically with any peripheral area of the grinding plate, without the bristle ring or the like. is a hindrance.
  • the plate grinder is held on the handle, which protrudes sideways as usual, so that, since the handle is designed as a rotary handle in driving connection with the lower part of the hood, the bristle ring position can be adjusted while holding and guiding the machine during workpiece machining without releasing the handle . You can thus keep the grinding machine different from the workpiece without interrupting the grinding and the bristle ring or the like. so that it always starts next to the current processing point. Without this measure, the machine would have to be lifted off the workpiece to turn the lower part of the hood and one would have to reach down to the lower part of the hood in the area of the grinding plate with the other hand, which would be dangerous and cumbersome. In addition, such machines are held regularly with both hands, so that the second hand would not be available for this.
  • the plate grinding machine which is designed as a hand-held device, is a so-called angle grinder.
  • the elongated machine housing 1; 1 a comprises a motor part 2; 2a containing the drive motor and a machine head 3; 3a, in which a deflection gear is arranged and from whose underside the drive shaft 4; 4a, which extends at right angles to the longitudinal direction of the housing, projects, which has a grinding plate 5 ; 5a drives to a rotational movement.
  • the grinding plate 5; 5a consists of grinding material or is provided with a grinding covering and is regularly held obliquely against the workpiece to be machined, so that it only engages the workpiece over a relatively small circumferential angle.
  • This angle grinder is held with both hands.
  • a handle 6; 6a which projects laterally in the direction from the machine housing 1; 1a and is attached approximately above the grinding plate 5; 5a.
  • the grinding plate 5; 5a can be pressed against the workpiece by means of this handle 6; 6a.
  • the other hand can, for example, encompass the elongated machine housing 1;
  • a dust extraction device which has a suction hood 7; 7a with a distance covering the upper side of the grinding plate and over the circumference of the grinding plate with a bristle ring 8; 8a or the like sitting on the workpiece . has at the bottom. Between the grinding plate circumference and the cross-over downwards, the bristle ring 8 or the like. supporting section there is an annular gap 10; 10a through which the grinding dust reaches a circumferential suction chamber 11; 11a in the suction hood 7; 7a.
  • a dust extraction nozzle 12; 12a is attached to the circumference of the suction hood 7; 7a and is in open connection with the suction chamber 11; 11a.
  • a vacuum cleaner or a dust bag can be connected to the suction nozzle 12; 12a.
  • 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; 4a and located in the suction path.
  • the bristle ring 8; 8a or the like (there could also be a ring of plastic knobs or a sealing lip made of resilient material) seals the hood interior on the workpiece from the outside, so that the grinding dust cannot get out here. However, outside air can be drawn in through the bristles to maintain the suction flow.
  • the suction hood 7; 7a is fixed to the machine head 3; 3a concentrically to the drive shaft 4; 4a and is penetrated by the drive shaft 4; 4a.
  • the grinding plate 5; 5a is fastened to the free end of the drive shaft 4; 4a, expediently screwed on.
  • the suction hood 7; 7a has an upper part 13; 13a facing the machine head 3; 3a, which is fastened to the machine head 3; 3a and contains the suction chamber 11; 11a.
  • This suction chamber 11; 11 a is closed at the top and the circumference. Down, i.e. to the grinding plate 5; 5a, the suction chamber 11; 11a is open.
  • the suction hood 7; 7a also contains a hood lower part 9; 9a which is rotatably arranged on the upper part 13; 13a of the suction hood producing the connection to the machine housing 1; 1a, independently of the grinding plate 5; 5a.
  • the bristle ring 8, 8a or the like. extends only over part of the circumference of the hood lower part 9; 9a, and expediently over an angular range of approximately 180 ° or less.
  • the bristle ring 8; 8a free peripheral area of the lower hood part 9; 9a represents a viewing area in which the bristles can look unobstructedly at the grinding plate 5; 5a and the workpiece.
  • the rotatable on the upper part 13; 13a lower part 9; 9a is rotated when using the machine in such a rotational position that the bristle ring 8; 8a or the like. in the area of the workpiece processing point and lying next to it. Since the sanding dust enters the gap 10; 10a essentially tangentially to the direction of rotation 16; 16a of the sanding plate 5; 5a, the bristle ring 8; 8a seen in the direction of rotation 16; 16a is offset somewhat to the rear with respect to the processing point, so that it is in Direction of the dust thrown away at the processing point.
  • the hood lower part 9 has a disc body 14 which is opposite the upper side of the grinding plate and which covers the open underside of the upper part 13 located above it to the grinding plate 5, which is rotatably mounted and the bristle ring 8 or the like on the circumference . wearing.
  • the disc body 14 has a passage opening 15 through which the grinding dust can reach the upper part 13 and thus the suction chamber 11.
  • the passage opening 15 in the disk body 14 expediently extends over a substantially the angular region of the bristle ring or the like. corresponding angular range, as shown in Fig. 6.
  • the passage opening 15 may also have the shape of a partial ring, or the like, the bristle ring 8. or the angled towards the grinding plate and the bristle ring 8 or the like. supporting lower edge 9 runs along.
  • the suction chamber 11 is open towards the disc body 14 via an annular opening 17.
  • the radius of the partial ring forming the passage opening 15 essentially corresponds to the radius of the ring-shaped circumferential entry opening 17.
  • the passage opening 15 is located opposite a corresponding circumferential area of the entry opening 17, while the remaining part of the entry opening 17 is covered.
  • the underside of the upper part 13 is formed by a bearing ring 18 screwed onto the end face, which protrudes radially inward from the circumference of the upper part below the suction chamber 11 and contains the annular inlet opening 17.
  • the disc body 14 of the lower part 9 is rotatably mounted.
  • the retaining ring 21 is connected to the disk body 14 by means of screws 22 accessible from the grinding plate 5.
  • the retaining ring 21 resting on the bearing shoulder 20 secures the disk body 14 at the same time in the axial direction towards the grinding plate 5. Since the retaining ring 18 projects freely radially inwards, the inlet opening 17 is divided into opening segments 17a-17d which are separated from one another by ribs 23 and are successive in the circumferential direction. The ribs 23 serve to hold the inner circumferential area of the bearing ring 18. When the above and in the following are referred to as the annular opening 17, the division into the opening segments 17a-17d is of course also recorded.
  • the disk body 14 and thus the hood lower part 9 are non-displaceably pivoted in both axial directions, which also applies to the exemplary embodiment according to FIGS. 7-9, to which we will come back later.
  • the lower hood part 9 is held downwards by the bearing shoulder 20. Since it or its disk body 14 rests on the upper part 13 or its bearing ring 18 from below, it cannot move upwards either.
  • the disk body 14 has a central passage recess 25, through which the drive shaft 4 is screwed to the grinding plate 5.
  • the inner circumferential region 26 of the disk body 14 delimiting the passage recess 25 projects toward the upper part 13 and forms a centering for the retaining ring 21.
  • the disc body 14 is arranged at an axial distance from the top of the grinding plate 5 so that the grinding dust can reach the passage opening 15.
  • the space 27 formed by this distance from the bristle ring 8 or the like. free circumferential area forth false air is sucked in to the passage opening 15, it is expediently provided that on the underside of the disk body 14 a protruding toward the grinding plate 5, the area of the passage opening 15 on the bristle ring 8 or the like. opposite side is arranged in the plane parallel to the disk body to the outside sealing body 28.
  • This is expediently formed by a sealing web. Instead of this, it could also be formed by a bristle strip.
  • the sealing web shown is integrally formed on the disc body 14.
  • the sealing body 28 expediently runs from the region of one end to the region of the other end of the bristle ring 8 or the angled peripheral lower edge of the bristle, which extends around the passage opening 15. At the two ends of the circumferential edge of the lower part 9, which is angled downwards and forms an outer boundary of the gap 10, sealing body pieces 29, 30 adjoining the sealing body 28 can be attached, which seal against the circumference of the grinding plate.
  • the sealing body 28 can also extend in an arc around the central disk body region and thus also around the drive shaft 4. Such dust particles, which are not captured by the passage opening 15, are thrown against this arcuate sealing body at the rear end of the bristle ring region in the direction of rotation 16 and are guided from this to the front end of the passage opening 17. As shown, the sealing body can run in a spiral-like manner with a radius that becomes smaller in the direction of rotation 16. So that any dust particles that may escape to the outside can be caught again, the sealing body 28 can form a passage 31 which is open in the direction of rotation at the front end as seen in the direction of rotation 16. The sealing body 28 is interrupted accordingly at this point. The passage 31 is adjacent to the front end of the passage opening 17, so that the dust particles are sucked off practically directly through it.
  • the lower hood part 9a does not extend, or only slightly, radially inwards into the space between the grinding plate 5a and the upper hood part 13a.
  • the wall of the upper part 13a merges essentially continuously into the wall of the hood lower part 9a.
  • the hood lower part 9a is rotatably mounted on the underside of the upper part 13a in the region of its outer circumference.
  • the disk body is shortened, so to speak, to a retaining ring 21a, with which the hood lower part 9a bears against the underside of the upper part 13a.
  • a bearing ring 18a with an L-shaped cross section which is screwed to the upper part 13a with screws 22a accessible from the grinding plate 5a and the retaining ring 21a reaches under.
  • the bearing ring 18a engages somewhat in the upper part 13a and lies against the circumferential wall from the inside.
  • the screws 22a engage through thickenings 50 formed on the inner circumference of the bearing ring 18a and are screwed into corresponding formations 51 on the inside of the upper part 13a.
  • the lower hood part 9a has a peripheral edge that surrounds the grinding plate.
  • this edge which is angled downward, extends only over the circumferential angle of the bristle ring.
  • the variant with a peripheral edge having the advantage that dust particles can be trapped all around.
  • the peripheral edge replaces, so to speak Sealing body 28 of the exemplary embodiment according to FIGS. 1-6. It goes without saying that the peripheral edge ends somewhat above the underside of the grinding plate 5a, so that its lower peripheral edge is exposed.
  • the bristle ring 8a or the like. bearing edge portion 52 is radially offset with respect to the remaining edge area, as can be seen from FIGS. 7 and 8, so that here the gap 10a is formed, while the remaining edge area is closer to the periphery of the grinding plate.
  • Fig. 8 also shows that the bristle ring 8a or the like. runs spirally, so that the gap 10a narrows in the direction of rotation 16a. Accordingly, the edge portion 52 carrying the bristle ring also runs spirally. The dust particles are thrown into the gap 10a at the wider end thereof. This can also be provided in the embodiment according to FIGS. 1-6.
  • the bristle ring 8a can be formed by a bristle strip 53 which has a strip body 54 which is inserted into an annular groove 54 of the lower part 9a and from which the bristles protrude. If the bristles are worn out, the bristle strip 53 can be replaced very easily. This can also be provided in the embodiment according to FIGS. 1-6.
  • a disc body corresponding to the disc body 14 of the exemplary embodiment according to FIGS. 1-6 can also be provided on the lower part of the hood, just as in the arrangement according to FIGS 1 - 6 could store the lower part of the hood on the outer circumference of the underside of the upper part.
  • the upper part 13; 13a essentially the shape of a flat, to the grinding plate 5; 5a open can, which is covered by the disc body 14 in the embodiment of FIGS. 1-6.
  • the suction hood 7; 7a is an additional part which is arranged between the grinding plate 5; 5a and the machine housing 1; 1a and is detachably fastened to the latter.
  • the suction hood can also be completely removed, especially if you are working on those workpiece points where it is a hindrance due to space constraints or where the sanding plate should be visible all around.
  • a drive shaft 4; 4a coaxial cylindrical housing projection 40; 40a On the underside of the housing head 3; 3a is a drive shaft 4; 4a coaxial cylindrical housing projection 40; 40a.
  • the upper part 13; 13a of the suction hood can be plugged onto this housing projection 40; 40a by the upper part 13; 13a having a corresponding cylindrical push-on sleeve 41; 41a owns.
  • the hood upper part 13; 13a and with it the entire suction hood can be clamped to the housing projection 40; 40a.
  • an eccentric lever 42 is present in the embodiment according to FIGS. 1-6, which is operated by hand.
  • the eccentric lever 42 is pivotably attached to the upper part 13 about a pivot axis 43 running parallel to the drive shaft 4 and engages with its clamping end through the plug sleeve 41 which is interrupted here.
  • the clamping end is designed as an eccentric so that its pivoting part 42 is clamped against the housing projection 40 by pivoting the eccentric lever 42 is, so that the upper part 13 and with it the entire suction hood 7 is held.
  • the eccentric lever 42 sits in front of the machine head 3 on the top of the upper part 13 and is therefore easily accessible. His lever arm, which can be gripped by hand, protrudes to the side.
  • a clamping screw 55 which is screwed radially through the hood upper part 13a and which carries an actuating lever 56 on the outside for easier turning and presses with its end face against the housing projection 40a.
  • the hood upper part 13a has an elevation 57 on its upper side.
  • the of the push-on sleeve 41; 41 a formed plug-in opening of the hood upper part 13; 13a to adapt to the diameter of the housing projection 40; 40a a slotted insert ring 58 can be assigned, which can be clamped against the housing projection 40, 40a.
  • the same suction hood can be used for machines with different housing projections 40; 40a by inserting the appropriate insert ring 58 into the push-on sleeve 41.
  • the clamping screw 55 then presses against the slotted insert ring 58 so that it is clamped against the housing projection 40a.
  • the already mentioned handle 6, 6a is designed as a rotary handle, which is connected in a driving manner to the hood lower part 9; 9a stands.
  • the handle 6, which has an elongated shape and is oriented transversely to the drive shaft 4; 4a of the grinding plate 5; 5a, can thus be rotated about its own axis, the hood lower part 9; 9a and with it the bristle ring 8; 8a or the like turns with. In this way, the handle 6; 6a holding hand during the grinding process, the bristle ring is brought to the most favorable location for dust extraction.
  • the transmission can be a rope or belt transmission.
  • the lower hood part 9 is in a driving connection with the rotary handle 6 via a cable pull 32.
  • This cable pull 32 is formed by a cable which runs similarly to an eight-shaped double loop, the individual cables 33, 34 of which are at right angles to one another.
  • a single loop 33 is guided on the circumference of the hood upper part 13 and fastened to the hood lower part 9, while the other single loop 34 loops around and is fastened to the rotary handle 6, the two individual loops 33, 34 on one deflecting device 35 arranged on the hood upper part 13, for example a roller or a deflecting bolt, merge into one another.
  • the handle 6 carries at its end facing the machine head a drive pulley 36 with a larger diameter than the handle 6, on the circumference of which the cable is attached at 37, the single loop 34 of which runs in a circumferential groove of the drive pulley 36.
  • the deflection device 35 is located below the handle 6 on the upper part 13, in such a way that the cable deflected at the deflection device 35 is arranged on both sides of the deflection device 35 at the level of a circumferential groove provided on the lower part 9 of the hood, in which the single loop 33 is guided.
  • a cable holder 38 stands on its outside up to the height of the circumferential groove of the upper part 13 which guides the single cable loop 33. If you turn the handle 6 in one direction or the other, the rope attached to the handle at 37 is taken along.
  • the lower individual loop 33 slips in the circumferential groove of the hood part and takes the pulley body 14 with it via the cable holder 38.
  • the transmission is a gear transmission.
  • the rotary handle 6a carries at its end region opposite the free handle end a coaxial gear wheel 60 which is in engagement with a toothed ring 61 arranged on the lower hood part 9a.
  • the rotary handle 6a has a radially projecting drive disk 36a, on the opposite side of the free handle end of which the toothed wheel 60 is arranged, the teeth of which are located on the circumference of the drive disk 36a, which in the exemplary embodiment is a bevel gear.
  • the hood lower part 9a protrudes in the radial direction above the hood upper part 13a and carries the ring gear 61 on the projecting area.
  • the ring gear 61 is located on the top of the projecting area of the hood lower part 9a.
  • the hood lower part 9a rotates under the gear 60.
  • the gear wheel 60 and the ring gear 61 are integrally formed on the rotary handle 6a or on the hood lower part 9a, but in principle it could also be separate and correspondingly fastened parts.
  • rotary drive Another option for the rotary drive would be a flexible shaft between the rotary handle and the lower part of the hood.
  • the rotary handle 6 is located on the machine housing 1 and thereby on the machine head 3.
  • the rotary handle 6a on Hood upper part 13a is arranged.
  • the suction hood can then be completely prefabricated, including the rotary drive of the hood lower part and the rotary handle, and can then be attached to the machine head as a whole.
  • a lever-supporting element 62 on which the axis of rotation is seated, can stand up from the top of the hood upper part 13a in the region of the circumference thereof for the rotary mounting of the rotary handle 6a. There is then enough space for gripping the rotary handle 6a by hand.
  • FIG. 10 A variant of the rotary handle arranged on the hood upper part is shown schematically in FIG. 10.
  • This rotary handle 6b is arranged above the hood upper part 13b, for which purpose a rotary handle support element 45 stands up from the upper part 13b, between which and the rotary handle 6b there is a rotary bearing.
  • the hood lower part 9b, the bristle ring 8b and the machine head 3b are also given a reference number in FIG. 10.
  • a dust extraction connection 12; 12a connected to the hood upper part 13; 13a is attached to the extraction chamber 11; 11a.
  • This can protrude essentially tangentially from the circumference of the upper hood part 13; 13a, it being expediently arranged on the side of the upper hood part 13; 13a opposite the rotary handle 6; 6a so that it faces away from the hand holding the rotary handle 6; 6a.
  • the suction nozzle 12; 12a does not hinder the attachment of the suction hood to the machine, the arrangement can also be such that the suction nozzle 12; 12a does not protrude upwards over the hood upper part 13; 13a on the side opposite the hood lower part 9; 9a.
  • a dust guide plate 63 or the like preventing the dust from being blown past the mouth be arranged, which extends from the top of the hood upper part 13; 13a in the suction chamber 11; 11a to the grinding plate 5; 5a.
  • the dust deflector plate 63 or the like. is indicated by dashed lines in Fig. 8, it is molded onto the underside of the upper part, which is not visible here.
  • the dust extraction from the extraction chamber to the outside could take place instead of through the nozzle 12; 12a also through a suction channel 11b penetrating the rotary handle 6b (FIG. 10).
  • the suction channel 11b thus runs in the rotary handle 6b, then in the support element 45 and then through the upper side of the hood upper part 13b into the suction space contained therein.
  • a spring-loaded locking plate 46; 46a which can be actuated from the outside and can be moved back and forth transversely to the drive shaft 4; 4a and which, in its active position, engages around the drive shaft 4; 4a in a fork-like manner and thereby holds it in a rotationally fixed manner.
  • the illustrated locking plate 46; 46a has a fork slot 47 (see FIG. 5) which has an area 48 with a larger one Diameter than the drive shaft 4 and a region 49 with a diameter holding the drive shaft.
  • this locking plate 46; 46a is in the position in which the drive shaft 4, 4a penetrates the fork slot area 48 of larger diameter. If you want to determine the drive shaft to replace the grinding plate, you move the locking plate so that the area 49 of the fork slot 47 reaches the drive shaft 4, 4a and this is held.
  • the fork legs 46 ', 46 ";46'a, 46 " b running on both sides of the drive shaft can also be seen from FIGS. 2 and 7. Since the locking plate 46a of the exemplary embodiment according to FIGS. 7-9 can correspond to the locking plate 46, no reference numbers have been entered in FIG. 8 for its details.
  • the drive shaft is provided with flats for the attack of the fork legs, in Fig. 7 this drive shaft section is shown at 65.
  • the locking plate 46; 46a is or the like on suitably arranged in the upper part 13; 13a. slidable back and forth. 7 two bearing webs 66, 67 are indicated. It is also spring-loaded, for which purpose a spring 50, which is connected on the one hand to the locking plate 46; 46a and on the other hand to the hood upper part, is used, which is only shown in FIGS. 5 and 6. This spring 50 holds the locking plate in the position in which the drive shaft 4; 4a penetrates the slot area 48 of larger diameter. To lock the drive shaft, pull on the outside with the locking plate 46; 46a connected handle 51; 51a against the force of the spring 50.
  • the hood lower part 9; 9a has an opening 68 (see FIG. 9) on the circumference for the passage of a tool engaging with the grinding plate 5; 5a, with which the grinding plate screwed onto the drive shaft is held while the drive shaft is held in place can detach from this.
  • this interruption 68 which has the shape of a slot, is located on the circumferential edge of the lower part of the hood projecting downwards and in the region of the bristle strip 53, which is partially visible here through the opening 68.
  • the suction hood could also be a machine-fixed part, for example in that the hood top part is attached to the housing in one piece or by a fixed connection.
  • a detachably attached suction hood is more appropriate.

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  • 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)

Description

Die Erfindung betrifft eine als Handgerät ausgebildete Tellerschleifmaschine, mit einem von einer Antriebswelle zu einer Rotationsbewegung angetriebenen Schleifteller, einem seitlich in Richtung vom Maschinengehäuse weg abstehenden Handgriff und einer Staubabsaugeinrichtung, die eine die Schleifteller-Oberseite mit Abstand überdeckende, den Schleiftellerumfang übergreifende, einen Absaugraum enthaltende und am Maschinengehäuse festgelegte Absaughaube mit einem auf einem Werkstück aufsitzenden Borstenkranz od.dgl. an der Unterseite aufweist, wobei sich der Borstenkranz unter Freilassen eines Sichtbereichs zum Werkstück hin nur über einen Teil des Umfangs der Absaughaube erstreckt und wobei der Schleifstaub zwischen dem Schleiftellerumfang und dem Borstenkranz od.dgl. hindurch zum Absaugraum gelangt.The invention relates to a plate grinding machine designed as a hand-held device, with a grinding plate driven by a drive shaft for a rotational movement, a handle projecting laterally in the direction away from the machine housing, and a dust extraction device which has a suction space that covers the upper side of the grinding plate by a distance and spans the circumference of the grinding plate and the suction hood fixed to the machine housing with a bristle ring or the like seated on a workpiece. has on the underside, wherein the bristle ring extends only a part of the circumference of the suction hood while leaving a visible area to the workpiece, and wherein the grinding dust or the like between the grinding plate circumference and the bristle ring. through to the suction chamber.

Mit Hilfe einer so ausgestatteten Tellerschleifmaschine kann zwar die jeweilige Bearbeitungsstelle eingesehen werden. Dies jedoch nur dann, wenn die Tellerschleifmaschine so gehalten wird, daß der vom Borstenkranz od.dgl. freie Schleiftellerbereich am Werkstück angreift. Dies ist jedoch des öfteren je nach den örtlichen Verhältnissen bzw. der Werkstückgestalt nicht möglich. Auch selbst wenn man das Werkstück mit dem nicht von dem Borstenkranz od.dgl. umschlossenen Schleiftellerbereich bearbeiten kann, besteht noch der Nachteil, daß häufig zwischen der lokalen Bearbeitungsstelle und dem Beginn des Borstenkranzes od.dgl. ein Abstand vorhanden ist, so daß der tangential weggeschleuderte Staub nicht vom Borstenkranz eingefangen wird, sondern außen an diesem vorbeifliegt und somit nicht abgesaugt wird.With the help of a plate grinding machine equipped in this way, the respective processing point can be viewed. However, this only if the plate grinder is held so that the bristle ring or the like. free grinding plate area attacks the workpiece. However, this is often not possible depending on the local conditions or the shape of the workpiece. Even if the workpiece with the bristle ring or the like is not. can edit enclosed grinding plate area, there is the disadvantage that often between the local processing point and the beginning of the bristle ring or the like. there is a distance so that the tangentially flung dust is not caught by the bristle ring, but flies past it on the outside and is therefore not extracted.

Der vorliegenden Erfindung liegt deshalb die Aufgabe zugrunde, eine Tellerschleifmaschine der eingangs genannten Art zu schaffen, bei der ein vom Borstenkranz od.dgl. unbehindertes Bearbeiten von Werkstücken mit einem beliebigen Schleiftellerbereich möglich ist, und zwar ohne daß hierdurch die Staubabsaugung leidet. Dabei sollen die hierfür erforderlichen Maßnahmen möglichst einfach und eine leichte Handhabung gegeben sein.The present invention is therefore based on the object to provide a disc grinder of the type mentioned, in which a bristle ring or the like. unhindered machining of workpieces with any sanding pad area is possible, without the dust extraction suffering as a result. The measures required for this should be as simple as possible and easy to use.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß die Absaughaube ein am die Verbindung zum Maschinengehäuse herstellenden Oberteil der Absaughaube unabhängig vom Schleifteller drehbar angeordnetes und den Borstenkranz od.dgl. tragendes Unterteil enthält und daß der Handgriff ein Drehgriff ist, der über ein Getriebe in treibender Verbindung mit dem Unterteil der Absaughaube steht.This object is achieved in that the suction hood rotatably arranged on the connecting part to the machine housing of the suction hood independently of the grinding plate and the like or the bristle ring. contains supporting lower part and that the handle is a twist grip which is drivingly connected to the lower part of the suction hood via a gear.

Nach wie vor ist also der Schleiftellerumfang nur teilweise durch den Borstenkranz od.dgl. verdeckt. Da dieser zusammen mit dem Haubenunterteil um den Schleifteller herum verdreht werden kann, kann er jeweils in die Umfangsposition gedreht werden, wo der Staub entsteht, so daß man den Schleifteller in beliebiger Lage am Werkstück ansetzen kann und dabei stets eine gute Staubabsaugung erhält. Dabei kann man den Borstenkranz od.dgl. in Richtung entgegen der Rotationsrichtung des Schleiftellers so nahe an die jeweilige Bearbeitungsstelle drehen, daß der vom Werkstück im wesentlichen tangential weggeschleuderte Schleifstaub zwischen dem Borstenkranz od.dgl. und dem Schleiftellerumfang hindurch zum Absaugraum gelangt. Hierbei ist die Bearbeitungsstelle einsehbar und man erhält den weiteren Vorteil, daß man mit dem Schleifteller auch in Werkstückfugen od.dgl. gelangen kann und zwar praktisch mit jedem Umfangsbereich des Schleiftellers, ohne daß der Borstenkranz od.dgl. hinderlich ist.As before, the grinding plate circumference is only partially or the like through the bristle ring. covered. Since this can be rotated around the sanding plate together with the lower part of the hood, it can be rotated into the circumferential position where the dust is generated, so that the sanding plate can be attached to the workpiece in any position and always has good dust extraction. You can use the bristle ring or the like. turn in the direction opposite to the direction of rotation of the grinding plate so close to the respective processing point that the grinding dust or the like is thrown substantially tangentially away from the workpiece between the bristle ring or the like. and reaches the suction chamber through the grinding plate circumference. Here, the processing point is visible and you get the further advantage that you can use the grinding plate or the like in workpiece joints. can get to practically with any peripheral area of the grinding plate, without the bristle ring or the like. is a hindrance.

Die Tellerschleifmaschine wird an dem wie üblich seitlich abstehenden Handgriff gehalten, so daß man, da der Handgriff als mit dem Haubenunterteil in treibender Verbindung stehender Drehgriff ausgebildet ist, gleichzeitig mit dem Halten und Führen der Maschine die Borstenkranzstellung während der Werkstückbearbeitung ohne Loslassen des Griffs verstellen kann. Man kann somit ohne Unterbrechung des Schleifens die Schleifmaschine unterschiedlich zum Werkstück halten und dabei den Borstenkranz od.dgl. so nachführen, daß er immer neben der momentanen Bearbeitungsstelle beginnt. Ohne diese Maßnahme müßte man die Maschine zum Verdrehen des Haubenunterteils jeweils vom Werkstück abheben und man müßte mit der anderen Hand nach unten zum Haubenunterteil in den Bereich des Schleiftellers greifen, was gefährlich und umständlich wäre. Außerdem werden derartige Maschinen regelmäßig mit beiden Händen gehalten, so daß die zweite Hand hierfür nicht zur Verfügung stehen würde.The plate grinder is held on the handle, which protrudes sideways as usual, so that, since the handle is designed as a rotary handle in driving connection with the lower part of the hood, the bristle ring position can be adjusted while holding and guiding the machine during workpiece machining without releasing the handle . You can thus keep the grinding machine different from the workpiece without interrupting the grinding and the bristle ring or the like. so that it always starts next to the current processing point. Without this measure, the machine would have to be lifted off the workpiece to turn the lower part of the hood and one would have to reach down to the lower part of the hood in the area of the grinding plate with the other hand, which would be dangerous and cumbersome. In addition, such machines are held regularly with both hands, so that the second hand would not be available for this.

Ausführungsbeispiele der Erfindung und zweckmäßige Ausgestaltungen werden nun anhand der Zeichnung im einzelnen beschrieben. Es zeigen:

  • Fig. 1 eine erfindungsgemäße Tellerschleifmaschine in explodierter Seitenansicht gemäß Pfeil in Fig. 3,
  • Fig. 2 die Tellerschleifmaschine gemäß Fig. 1 im zur Zeichenebene der Fig. 1 parallelen Längsschnitt,
  • Fig. 3 eine Draufsicht von oben in Richtung gemäß Pfeil 111 in Fig. 2 gesehen der gleichen Maschine,
  • Fig. 4 die der Fig. 1 entgegengesetzte Seitenansicht (Pfeil IV in Fig. 3) der Tellerschleifmaschine,
  • Fig. 5 die Absaughaube in gesonderter Darstellung in Draufsicht von oben gemäß Pfeil V in Fig. 1,
  • Fig. 6 die Absaughaube gemäß Fig. 5 in entgegengesetzter Draufsicht von unten her gesehen,
  • Fig. 7 eine zweites Ausführungsbeispiel der erfindungsgemäßen Tellerschleifmaschine im der Fig. 2 entsprechenden Längsschnitt,
  • Fig. 8 die Absaughaube der Tellerschleifmaschine gemäß Fig. 7 in gesonderter Darstellung in der Fig. 5 entsprechender Draufsicht von oben,
  • Fig. 9 die Absaughaube des Ausführungsbeispiels nach den Fig. 7 und 8 in Stirnansicht gemäß Pfeil IX in Fig. 7 und
  • Fig. 10 die schematische Darstellung einer weiteren Variante der erfindungsgemäßen Tellerschleifmaschine in Stirnansicht beispielsweise gemäß Pfeil VII in Fig. 4 oder Pfeil IX in Fig. 7.
Embodiments of the invention and expedient embodiments are now described in detail with reference to the drawing. Show it:
  • 1 is a plate grinding machine according to the invention in an exploded side view according to the arrow in Fig. 3,
  • 2 shows the disc grinding machine according to FIG. 1 in a longitudinal section parallel to the drawing plane of FIG. 1,
  • 3 shows a plan view from above in the direction according to arrow 111 in FIG. 2 of the same machine,
  • 4 the side view (arrow IV in FIG. 3) of the plate grinding machine opposite to FIG. 1,
  • 5 the suction hood in a separate representation in plan view from above according to arrow V in FIG. 1,
  • 6 seen the suction hood according to FIG. 5 in an opposite plan view from below,
  • 7 shows a second exemplary embodiment of the plate grinding machine according to the invention in the longitudinal section corresponding to FIG. 2,
  • 8 shows the suction hood of the disc grinding machine according to FIG. 7 in a separate representation in FIG. 5 corresponding top view from above,
  • Fig. 9, the suction hood of the embodiment of FIGS. 7 and 8 in front view according to arrow IX in Fig. 7 and
  • 10 shows the schematic representation of a further variant of the plate grinding machine according to the invention in front view, for example according to arrow VII in FIG. 4 or arrow IX in FIG. 7.

Bei der als Handgerät ausgebildeten Tellerschleifmaschine handelt es sich um einen sogenannten Winkelschleifer. Das längliche Maschinengehäuse 1;1 a umfaßt einen den Antriebsmotor enthaltenden Motorteil 2;2a und einen Maschinenkopf 3;3a, in dem ein Umlenkgetriebe angeordnet ist und aus dessen Unterseite die rechtwinkelig zur Gehäuse-Längsrichtung verlaufende Antriebswelle 4;4a ragt, die einen Schleifteller 5;5a zu einer Rotationsbewegung antreibt. Der Schleifteller 5;5a besteht aus Schleifmaterial oder ist mit einem Schleifbelag versehen und wird regelmäßig schräg gegen das zu bearbeitende Werkstück gehalten, so daß er nur über einen verhältnismäßig kleinen Umfangswinkel an diesem angreift.The plate grinding machine, which is designed as a hand-held device, is a so-called angle grinder. The elongated machine housing 1; 1 a comprises a motor part 2; 2a containing the drive motor and a machine head 3; 3a, in which a deflection gear is arranged and from whose underside the drive shaft 4; 4a, which extends at right angles to the longitudinal direction of the housing, projects, which has a grinding plate 5 ; 5a drives to a rotational movement. The grinding plate 5; 5a consists of grinding material or is provided with a grinding covering and is regularly held obliquely against the workpiece to be machined, so that it only engages the workpiece over a relatively small circumferential angle.

Dieser Winkelschleifer wird beidhändig gehalten. Zum Halten mit der einen Hand ist ein seitlich in Richtung vom Maschinengehäuse 1;1a abstehender Handgriff 6;6a vorhanden, der etwa oberhalb des Schleiftellers 5;5a angebracht ist. Mittels dieses Handgriffs 6;6a kann der Schleifteller 5;5a gegen das Werkstück gedrückt werden. Die andere Hand kann beispielsweise das längliche Maschinengehäuse 1;1 a umfaßen, wozu dieses griffgünstig ausgebildet sein kann.This angle grinder is held with both hands. For holding with one hand there is a handle 6; 6a which projects laterally in the direction from the machine housing 1; 1a and is attached approximately above the grinding plate 5; 5a. The grinding plate 5; 5a can be pressed against the workpiece by means of this handle 6; 6a. The other hand can, for example, encompass the elongated machine housing 1;

Um zu vermeiden, daß der beim Schleifen anfallende Schleifstaub in die Umgebung gelangt, ist eine Staubabsaugeinrichtung vorhanden, die eine die Schleifteller-Oberseite mit Abstand überdeckende und den Schleiftellerumfang übergreifende Absaughaube 7;7a mit einem auf dem Werkstück aufsitzenden Borstenkranz 8;8a od.dgl. an der Unterseite aufweist. Zwischen dem Schleiftellerumfang und der diesen nach unten hin übergreifenden, den Borstenkranz 8 od.dgl. tragenden Partie ist ein Ringspalt 10;10a vorhanden, durch den hindurch der Schleifstaub zu einem umlaufenden Absaugraum 11;11 a in der Absaughaube 7;7a gelangt. An den Umfang der Absaughaube 7;7a ist ein Staubabsaugstutzen 12;12a angesetzt, der mit dem Absaugraum 11;11a in offener Verbindung steht. An den Absaugstutzen 12;12a kann ein Staubsauger oder ein Staubsack angeschlossen werden. Zur Erzeugung des Saugstroms dient ein nicht dargestelltes Gebläse, das extern oder auch innerhalb der Maschine beispielsweise in Gestalt eines an der Antriebswelle 4;4a sitzenden und im Absaugweg befindlichen Gebläserades angeordnet sein kann.In order to avoid that the grinding dust occurring during grinding gets into the environment, a dust extraction device is provided which has a suction hood 7; 7a with a distance covering the upper side of the grinding plate and over the circumference of the grinding plate with a bristle ring 8; 8a or the like sitting on the workpiece . has at the bottom. Between the grinding plate circumference and the cross-over downwards, the bristle ring 8 or the like. supporting section there is an annular gap 10; 10a through which the grinding dust reaches a circumferential suction chamber 11; 11a in the suction hood 7; 7a. A dust extraction nozzle 12; 12a is attached to the circumference of the suction hood 7; 7a and is in open connection with the suction chamber 11; 11a. A vacuum cleaner or a dust bag can be connected to the suction nozzle 12; 12a. 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; 4a and located in the suction path.

Der Borstenkranz 8;8a od.dgl (es könnte auch ein Kranz von Kunststoffnoppen oder eine aus nachgiebigem Material bestehende Dichtlippe vorhanden sein) dichtet den Haubeninnenraum am Werkstück nach aussen hin ab, so daß der Schleifstaub hier nicht nach außen gelangen kann. Dabei kann jedoch durch die Borsten Außenluft zur Aufrechterhaltung des Saugstroms angesaugt werden.The bristle ring 8; 8a or the like (there could also be a ring of plastic knobs or a sealing lip made of resilient material) seals the hood interior on the workpiece from the outside, so that the grinding dust cannot get out here. However, outside air can be drawn in through the bristles to maintain the suction flow.

Die Absaughaube 7;7a ist konzentrisch zur Antriebswelle 4;4a am Maschinenkopf 3;3a feststehend angebracht und wird von der Antriebswelle 4;4a durchsetzt. Am freien Ende der Antriebswelle 4;4a ist der Schleifteller 5;5a befestigt, zweckmäßigerweise angeschraubt.The suction hood 7; 7a is fixed to the machine head 3; 3a concentrically to the drive shaft 4; 4a and is penetrated by the drive shaft 4; 4a. The grinding plate 5; 5a is fastened to the free end of the drive shaft 4; 4a, expediently screwed on.

Die Absaughaube 7;7a besitzt ein dem Maschinenkopf 3;3a zugewandtes Oberteil 13;13a, das am Maschinenkopf 3;3a befestigt ist und den Absaugraum 11;11 a enthält. Dieser Absaugraum 11;11 a ist nach oben und zum Umfang hin abgeschlossen. Nach unten, d.h. zum Schleifteller 5;5a hin, ist der Absaugraum 11;11 a dagegen offen.The suction hood 7; 7a has an upper part 13; 13a facing the machine head 3; 3a, which is fastened to the machine head 3; 3a and contains the suction chamber 11; 11a. This suction chamber 11; 11 a is closed at the top and the circumference. Down, i.e. to the grinding plate 5; 5a, the suction chamber 11; 11a is open.

Die Absaughaube 7;7a enthält ferner ein am die Verbindung zum Maschinengehäuse 1;1 a herstellenden Oberteil 13;13a der Absaughaube unabhängig vom Schleifteller 5;5a drehbar angeordnetes Haubenunterteil 9;9a. Der Borstenkranz 8 , 8a od.dgl. erstreckt sich nur über einen Teil des Umfangs des Haubenunterteils 9;9a, und zwar zweckmäßigerweise über einen Winkelbereich von etwa 180° oder weniger. Der vom Borstenkranz 8; 8a freie Umfangsbereich des Haubenunterteils 9;9a stellt einen Sichtbereich dar, in dem von den Borsten ungehindert zum Schleifteller 5;5a und zum Werkstück geblickt werden kann.The suction hood 7; 7a also contains a hood lower part 9; 9a which is rotatably arranged on the upper part 13; 13a of the suction hood producing the connection to the machine housing 1; 1a, independently of the grinding plate 5; 5a. The bristle ring 8, 8a or the like. extends only over part of the circumference of the hood lower part 9; 9a, and expediently over an angular range of approximately 180 ° or less. The bristle ring 8; 8a free peripheral area of the lower hood part 9; 9a represents a viewing area in which the bristles can look unobstructedly at the grinding plate 5; 5a and the workpiece.

Das drehbar am Oberteil 13;13a gelagerte Unterteil 9;9a dreht man bei Benutzung der Maschine in eine solche Drehlage, daß der Borstenkranz 8;8a od.dgl. im Bereich der Werkstück-Bearbeitungsstelle und dabei neben dieser liegt. Da der Schleifstaub im wesentlichen tangential zur Rotationsrichtung 16;16a des Schleiftellers 5;5a in den Spalt 10;10a eintritt, wird der Borstenkranz 8;8a in Rotationsrichtung 16;16a gesehen mit Bezug auf die Bearbeitungsstelle etwas nach hinten versetzt, so daß er in Richtung des weggeschleuderten Staubes an der Bearbeitungsstelle beginnt.The rotatable on the upper part 13; 13a lower part 9; 9a is rotated when using the machine in such a rotational position that the bristle ring 8; 8a or the like. in the area of the workpiece processing point and lying next to it. Since the sanding dust enters the gap 10; 10a essentially tangentially to the direction of rotation 16; 16a of the sanding plate 5; 5a, the bristle ring 8; 8a seen in the direction of rotation 16; 16a is offset somewhat to the rear with respect to the processing point, so that it is in Direction of the dust thrown away at the processing point.

Beim Ausführungsbeispiel gemäß den Fig. 1 - 6 weist das Haubenunterteil 9 einen der Schleifteller-Oberseite gegenüberliegenden, die offene Unterseite des darüber befindlichen Oberteils 13 zum Schleifteller 5 hin abdeckenden Scheibenkörper 14 auf, der drehbar gelagert ist und am Umfang den Borstenkranz 8 od.dgl. trägt. Im Winkelbereich des Borstenkranzes 8 od.dgl. weist der Scheibenkörper 14 eine Durchtrittsöffnung 15 auf, durch die hindurch der Schleifstaub in das Oberteil 13 und somit in den Absaugraum 11 gelangen kann. Die Durchtrittsöffnung 15 im Scheibenkörper 14 erstreckt sich zweckmäßigerweise über einen im wesentlichen dem Winkelbereich des Borstenkranzes od.dgl. entsprechenden Winkelbereich, wie aus Fig. 6 hervorgeht. Die Durchtrittsöffnung 15 kann ferner die Gestalt eines Teilrings besitzen, der dem Borstenkranz 8 od.dgl. bzw. dem zum Schleifteller hin abgewinkelten und den Borstenkranz 8 od.dgl. tragenden Unterteilrand 9 entlang verläuft. Dabei ist der Absaugraum 11 zum Scheibenkörper 14 hin über eine ringförmig umlaufende Eintrittsöffnung 17 offen. Der Radius des die Durchtrittsöffnung 15 bildenden Teilrings entspricht im wesentlichen dem Radius der ringförmig umlaufenden Eintrittsöffnung 17. Somit befindet sich in jeder Drehstellung des Scheibenkörpers 14 die Durchtrittsöffnung 15 einem entsprechenden Umfangsbereich der Eintrittsöffnung 17 gegenüber während der restliche Teil der Eintrittsöffnung 17 abgedeckt ist.In the exemplary embodiment according to FIGS. 1-6, the hood lower part 9 has a disc body 14 which is opposite the upper side of the grinding plate and which covers the open underside of the upper part 13 located above it to the grinding plate 5, which is rotatably mounted and the bristle ring 8 or the like on the circumference . wearing. In the angular range of the bristle ring 8 or the like. the disc body 14 has a passage opening 15 through which the grinding dust can reach the upper part 13 and thus the suction chamber 11. The passage opening 15 in the disk body 14 expediently extends over a substantially the angular region of the bristle ring or the like. corresponding angular range, as shown in Fig. 6. The passage opening 15 may also have the shape of a partial ring, or the like, the bristle ring 8. or the angled towards the grinding plate and the bristle ring 8 or the like. supporting lower edge 9 runs along. The suction chamber 11 is open towards the disc body 14 via an annular opening 17. The radius of the partial ring forming the passage opening 15 essentially corresponds to the radius of the ring-shaped circumferential entry opening 17. Thus, in each rotational position of the disk body 14, the passage opening 15 is located opposite a corresponding circumferential area of the entry opening 17, while the remaining part of the entry opening 17 is covered.

Beim Ausführungsbeispiel nach den Fig. 1 - 6 wird die Unterseite des Oberteils 13 von einem stirnseitig angeschraubten Lagerring 18 gebildet, der unterhalb des Absaugraums 11 vom Oberteilumfang nach radial innen vorsteht und die ringförmig umlaufende Eintrittsöffnung 17 enthält. Am Innenumfang des Lagerrings 18 ist der Scheibenkörper 14 des Unterteils 9 drehbar gelagert. Hierzu befindet sich am Innenumfang des Lagerrings 18 ein radial nach innen hin vorstehender Lagerabsatz 20, der von einem mit dem Scheibenkörper 14 fest verbundenen Haltering 21 hintergriffen wird. Der Haltering 21 ist mit Hilfe von vom Schleifteller 5 her zugänglichen Schrauben 22 mit dem Scheibenkörper 14 verbunden. Der auf dem Lagerabsatz 20 aufliegende Haltering 21 sichert den Scheibenkörper 14 gleichzeitig in axialer Richtung zum Schleifteller 5 hin. Da der Haltering 18 nach radial innen hin frei vorsteht, ist die Eintrittsöffnung 17 in durch Rippen 23 voneinander getrennte, in Umfangsrichtung aufeinanderfolgende Öffnungssegmente 17a - 17d unterteilt. Die Rippen 23 dienen zum Halten des Innenumfangsbereichs des Lagerrings 18. Wenn oben und im folgenden von der ringförmig umlaufenden Eintrittsöffnung 17 gesprochen wird, so wird hiermit selbstverständlich auch die Unterteilung in die Öffnungssegmente 17a - 17d erfaßt.In the exemplary embodiment according to FIGS. 1-6, the underside of the upper part 13 is formed by a bearing ring 18 screwed onto the end face, which protrudes radially inward from the circumference of the upper part below the suction chamber 11 and contains the annular inlet opening 17. On the inner circumference of the La gerrings 18, the disc body 14 of the lower part 9 is rotatably mounted. For this purpose, there is a radially inwardly projecting bearing shoulder 20 on the inner circumference of the bearing ring 18, which is engaged behind by a retaining ring 21 which is firmly connected to the disk body 14. The retaining ring 21 is connected to the disk body 14 by means of screws 22 accessible from the grinding plate 5. The retaining ring 21 resting on the bearing shoulder 20 secures the disk body 14 at the same time in the axial direction towards the grinding plate 5. Since the retaining ring 18 projects freely radially inwards, the inlet opening 17 is divided into opening segments 17a-17d which are separated from one another by ribs 23 and are successive in the circumferential direction. The ribs 23 serve to hold the inner circumferential area of the bearing ring 18. When the above and in the following are referred to as the annular opening 17, the division into the opening segments 17a-17d is of course also recorded.

Es versteht sich, daß der Scheibenkörper 14 und somit das Haubenunterteil 9 in beiden axialen Richtungen unverschieblich drehgelagert ist, was auch für das Ausführungsbeispiel gemäß den Fig. 7 - 9 gilt, worauf noch zurückgekommen werden wird. Bei der Ausführungsform nach den Fig. 1 - 6 wird das Haubenunterteil 9 nach unten hin von dem Lagerabsatz 20 gehalten. Da es bzw. sein Scheibenkörper 14 von unten her an dem Oberteil 13 bzw. dessen Lagerring 18 anliegt, kann es sich auch nicht nach oben verlagern.It goes without saying that the disk body 14 and thus the hood lower part 9 are non-displaceably pivoted in both axial directions, which also applies to the exemplary embodiment according to FIGS. 7-9, to which we will come back later. In the embodiment according to FIGS. 1-6, the lower hood part 9 is held downwards by the bearing shoulder 20. Since it or its disk body 14 rests on the upper part 13 or its bearing ring 18 from below, it cannot move upwards either.

Der Scheibenkörper 14 besitzt eine zentrale Durchgangsausnehmung 25, durch die hindurch die Antriebswelle 4 mit dem Schleifteller 5 verschraubt ist. Der die Durchgangsausnehmung 25 begrenzende Innenumfangsbereich 26 des Scheibenkörpers 14 steht zum Oberteil 13 hin vor und bildet eine Zentrierung für den Haltering 21.The disk body 14 has a central passage recess 25, through which the drive shaft 4 is screwed to the grinding plate 5. The inner circumferential region 26 of the disk body 14 delimiting the passage recess 25 projects toward the upper part 13 and forms a centering for the retaining ring 21.

Der Scheibenkörper 14 ist mit axialem Abstand zur Oberseite des Schleiftellers 5 angeordnet, damit der Schleifstaub zur Durchtrittsöffnung 15 gelangen kann. Um zu vermeiden, daß über den von diesem Abstand gebildeten Zwischenraum 27 vom von dem Borstenkranz 8 od.dgl. freien Umfangsbereich her Falschluft zur Durchtrittsöffnung 15 hin angesaugt wird, ist zweckmäßigerweise vorgesehen, daß an der Unterseite des Scheibenkörpers 14 ein zum Schleifteller 5 hin vorstehender, den Bereich der Durchtrittsöffnung 15 an der dem Borstenkranz 8 od.dgl. entgegengesetzten Seite in der zum Scheibenkörper parallelen Ebene nach aussen hin abdichtender Dichtkörper 28 angeordnet ist. Dieser wird zweckmäßigerweise von einem Dichtsteg gebildet. Anstelle hiervon könnte er auch durch eine Borstenleiste gebildet sein. Der dargestellte Dichtsteg ist einstückig an den Scheibenkörper 14 angeformt. Somit ist der Zwischenraum 27 zwischen dem Schleifteller 5 und dem Scheibenkörper 14 in dem Bereich, wo sich die Durchtrittsöffnung 15 befindet, seitlich abgeschlossen, so daß nur durch den Umfangsspalt 10 am Schleifteller Luft und mit dieser der Schleifstaub angesaugt wird.The disc body 14 is arranged at an axial distance from the top of the grinding plate 5 so that the grinding dust can reach the passage opening 15. In order to avoid the space 27 formed by this distance from the bristle ring 8 or the like. free circumferential area forth false air is sucked in to the passage opening 15, it is expediently provided that on the underside of the disk body 14 a protruding toward the grinding plate 5, the area of the passage opening 15 on the bristle ring 8 or the like. opposite side is arranged in the plane parallel to the disk body to the outside sealing body 28. This is expediently formed by a sealing web. Instead of this, it could also be formed by a bristle strip. The sealing web shown is integrally formed on the disc body 14. Thus, the space 27 between the grinding plate 5 and the wheel body 14 is laterally closed in the area where the passage opening 15 is located, so that air and only the grinding dust is sucked in through the peripheral gap 10 on the grinding plate.

Der Dichtkörper 28 verläuft zweckmäßigerweise vom Bereich des einen Endes zum Bereich des anderen Endes des Borstenkranzes 8 bzw. des diesen tragenden abgewinkelten Umfangs-Unterteilrandes, wobei er sich um die Durchtrittsöffnung 15 herum erstreckt. An den beiden Enden des nach unten hin abgewinkelten und eine Außenbegrenzung des Spaltes 10 bildenden Umfangsrandes des Unterteils 9 können innenseitig an den Dichtkörper 28 anschließende Dichtkörperstücke 29,30 angesetzt sein, die gegen den Schleiftellerumfang abdichten.The sealing body 28 expediently runs from the region of one end to the region of the other end of the bristle ring 8 or the angled peripheral lower edge of the bristle, which extends around the passage opening 15. At the two ends of the circumferential edge of the lower part 9, which is angled downwards and forms an outer boundary of the gap 10, sealing body pieces 29, 30 adjoining the sealing body 28 can be attached, which seal against the circumference of the grinding plate.

Der Dichtkörper 28 kann ferner bogenförmig um den zentralen Scheibenkörperbereich und somit auch um die Antriebswelle 4 herum verlaufen. Solche Staubteilchen, die von der Durchtrittsöffnung 15 nicht eingefangen werden, werden am in Rotationsrichtung 16 hinteren Ende des Borstenkranzbereichs gegen diesen bogenförmigen Dichtkörper geschleudert und von diesem zum vorderen Ende der Durchtrittsöffnung 17 geführt. Dabei kann der Dichtkörper, wie dargestellt, spiralähnlich mit in Rotationsrichtung 16 kleiner werdendem Radius verlaufen. Damit auch evtl. nach außen gelangende Staubpartikel wieder eingefangen werden können, kann der Dichtkörper 28 am in Rotationsrichtung 16 gesehen vorderen Ende einen in Rotationsrichtung offenen Durchlaß 31 bilden. Der Dichtkörper 28 ist an dieser Stelle entsprechend unterbrochen. Der Durchlaß 31 ist dem vorderen Ende der Durchtrittsöffnung 17 benachbart, so daß die Staubpartikel praktisch direkt durch diese abgesaugt werden.The sealing body 28 can also extend in an arc around the central disk body region and thus also around the drive shaft 4. Such dust particles, which are not captured by the passage opening 15, are thrown against this arcuate sealing body at the rear end of the bristle ring region in the direction of rotation 16 and are guided from this to the front end of the passage opening 17. As shown, the sealing body can run in a spiral-like manner with a radius that becomes smaller in the direction of rotation 16. So that any dust particles that may escape to the outside can be caught again, the sealing body 28 can form a passage 31 which is open in the direction of rotation at the front end as seen in the direction of rotation 16. The sealing body 28 is interrupted accordingly at this point. The passage 31 is adjacent to the front end of the passage opening 17, so that the dust particles are sucked off practically directly through it.

Beim Ausführungsbeispiel gemäß den Fig. 7 - 9 erstreckt sich das Haubenunterteil 9a nicht oder nur kaum nach radial innen in den Raum zwischen den Schleifteller 5a und dem Haubenoberteil 13a. Im Querschnitt gesehen geht die Wandung des Oberteils 13a im wesentlichen kontinuierlich in die Wandung des Haubenunterteils 9a über. Dabei ist das Haubenunterteil 9a an der Unterseite des Oberteils 13a im Bereich von dessen Außenumfang drehbar gelagert. Hierzu ist bei diesem Ausführungsbeispiel der Scheibenkörper sozusagen zu einem Haltering 21 a verkürzt, mit dem das Haubenunterteil 9a gegen die Unterseite des Oberteils 13a anliegt. Zum drehbaren Fixieren des einstückig angeformten Halterings 21 a des Unterteils 9a, der nach radial innen vorsteht, ist ein Lagerring 18a mit L-förmigem Querschnitt vorhanden, der mit vom Schleifteller 5a her zugänglichen Schrauben 22a an das Oberteil 13a angeschraubt ist und den Haltering 21 a untergreift. Dabei greift der Lagerring 18a etwas in Oberteil 13a ein und liegt von innen her an dessen Umfangswand an. Die Schrauben 22a greifen durch am Innenumfang des Lagerrings 18a angeformte Verdickungen 50 und sind in entsprechende Anformungen 51 an der Innenseite des Oberteils 13a eingeschraubt.In the exemplary embodiment according to FIGS. 7-9, the lower hood part 9a does not extend, or only slightly, radially inwards into the space between the grinding plate 5a and the upper hood part 13a. Viewed in cross section, the wall of the upper part 13a merges essentially continuously into the wall of the hood lower part 9a. The hood lower part 9a is rotatably mounted on the underside of the upper part 13a in the region of its outer circumference. For this purpose, in this exemplary embodiment, the disk body is shortened, so to speak, to a retaining ring 21a, with which the hood lower part 9a bears against the underside of the upper part 13a. For rotatably fixing the integrally formed retaining ring 21 a of the lower part 9a, which protrudes radially inwards, there is a bearing ring 18a with an L-shaped cross section, which is screwed to the upper part 13a with screws 22a accessible from the grinding plate 5a and the retaining ring 21a reaches under. The bearing ring 18a engages somewhat in the upper part 13a and lies against the circumferential wall from the inside. The screws 22a engage through thickenings 50 formed on the inner circumference of the bearing ring 18a and are screwed into corresponding formations 51 on the inside of the upper part 13a.

Bei dem Ausführungsbeispiel nach den Fig. 7 - 9 weist das Haubenunterteil 9a einen umlaufenden, den Schleifteller umgreifenden Rand auf. Demgegenüber erstreckt sich beim Ausführungsbeispiel nach den Fig. 1 - 6 dieser nach unten hin abgewinkelte Rand nur über den Umfangswinkel des Borstenkranzes. Bei beiden Ausführungsbeispielen sind jedoch beide Varianten möglich, wobei die Variante mit umlaufendem Rand den Vorteil aufweist, daß rundum Staubpartikel eingefangen werden können. Dabei ersetzt der umlaufende Rand sozusagen den Dichtkörper 28 des Ausführungsbeispiels gemäß den Fig. 1 - 6. Es versteht sich, daß der umlaufende Rand etwas oberhalb von der Unterseite des Schleiftellers 5a endet, so daß deren untere Umfangskante freiliegt. Die den Borstenkranz 8a od.dgl. tragende Randpartie 52 ist mit Bezug auf den übrigen Randbereich radial vorversetzt, wie aus den Fig. 7 und 8 ersichtlich ist, so daß hier der Spalt 10a gebildet wird, wäührend der übrige Randbereich dem Schleiftellerumfang näher benachbart ist.In the exemplary embodiment according to FIGS. 7-9, the lower hood part 9a has a peripheral edge that surrounds the grinding plate. In contrast, in the exemplary embodiment according to FIGS. 1-6, this edge, which is angled downward, extends only over the circumferential angle of the bristle ring. In both embodiments, however, both variants are possible, the variant with a peripheral edge having the advantage that dust particles can be trapped all around. The peripheral edge replaces, so to speak Sealing body 28 of the exemplary embodiment according to FIGS. 1-6. It goes without saying that the peripheral edge ends somewhat above the underside of the grinding plate 5a, so that its lower peripheral edge is exposed. The bristle ring 8a or the like. bearing edge portion 52 is radially offset with respect to the remaining edge area, as can be seen from FIGS. 7 and 8, so that here the gap 10a is formed, while the remaining edge area is closer to the periphery of the grinding plate.

Aus Fig. 8 geht ferner hervor, daß der Borstenkranz 8a od.dgl. spiralig verläuft, so daß sich der Spalt 10a in Rotationsrichtung 16a verschmälert. Dementsprechend verläuft die den Borstenkranz tragende Randpartie 52 ebenfalls spiralig. Die Staubpartikel werden am breiteren Ende des Spaltes 10a in diesen eingeschleudert. Dies läßt sich auch beim Ausführungsbeispiel gemäß den Fig. 1 - 6 vorsehen.From Fig. 8 also shows that the bristle ring 8a or the like. runs spirally, so that the gap 10a narrows in the direction of rotation 16a. Accordingly, the edge portion 52 carrying the bristle ring also runs spirally. The dust particles are thrown into the gap 10a at the wider end thereof. This can also be provided in the embodiment according to FIGS. 1-6.

Der Borstenkranz 8a kann von einer Borstenleiste 53 gebildet werden, die einen in eine Ringnut 54 des Unterteils 9a eingesteckten Leistenkörper 54 besitzt, von dem die Borsten abstehen. Sind die Borsten abgenutzt, kann man die Borstenleiste 53 sehr einfach auswechseln. Dies kann beim Ausführungsbeispiel nach den Fig. 1 - 6 ebenfalls vorgesehen werden.The bristle ring 8a can be formed by a bristle strip 53 which has a strip body 54 which is inserted into an annular groove 54 of the lower part 9a and from which the bristles protrude. If the bristles are worn out, the bristle strip 53 can be replaced very easily. This can also be provided in the embodiment according to FIGS. 1-6.

Ferner wird in diesem Zusammenhang noch darauf hingewiesen, daß bei der Anordnung gemäß den Fig. 7 - 9 ebenfalls ein dem Scheibenkörper 14 des Ausführungsbeispiels nach den Fig. 1 - 6 entsprechender Scheibenkörper am Haubenunterteil vorsehen kann, ebenso wie man bei der Anordnung gemäß den Fig. 1 - 6 das Haubenunterteil am Außenumfang der Unterseite des Oberteils lagern könnte.Furthermore, it is pointed out in this connection that in the arrangement according to FIGS. 7-9, a disc body corresponding to the disc body 14 of the exemplary embodiment according to FIGS. 1-6 can also be provided on the lower part of the hood, just as in the arrangement according to FIGS 1 - 6 could store the lower part of the hood on the outer circumference of the underside of the upper part.

Bei beiden Ausführungsbeispielen besitzt das Oberteil 13; 13a im wesentlichen die Gestalt einer flachen, zum Schleifteller 5; 5a hin offenen Dose, die bei der Ausführungsform nach den Fig. 1 - 6 durch den Scheibenkörper 14 abgedeckt ist.In both embodiments, the upper part 13; 13a essentially the shape of a flat, to the grinding plate 5; 5a open can, which is covered by the disc body 14 in the embodiment of FIGS. 1-6.

Ferner ist bei beiden Ausführungsbeispielen die Absaughaube 7;7a ein zwischen dem Schleifteller 5;5a und dem Maschinengehäuse 1;1 a angeordnetes, an letzterem lösbar befestigtes Zusatzteil. Auf diese Weise kann man die Absaughaube auch ganz wegnehmen, vor allem wenn man solche Werkstückstellen bearbeitet, an denen sie aus Platzgründen hinderlich ist oder an denen der Schleifteller rundum sichtbar sein sollte. Außerdem kann man eine von Haus aus nicht mit einer Absaughaube versehene Maschine nachträglich mit einer solchen ausrüsten.Furthermore, in both exemplary embodiments, the suction hood 7; 7a is an additional part which is arranged between the grinding plate 5; 5a and the machine housing 1; 1a and is detachably fastened to the latter. In this way, the suction hood can also be completely removed, especially if you are working on those workpiece points where it is a hindrance due to space constraints or where the sanding plate should be visible all around. In addition, you can retrofit a machine that is not equipped with a suction hood from scratch.

An der Unterseite des Gehäusekopfes 3;3a steht ein zur Antriebswelle 4; 4a koaxialer zylindrischer Gehäusevorsprung 40;40a vor. Auf diesen Gehäusevorsprung 40;40a ist das Oberteil 13;13a der Absaughaube aufsteckbar, indem das Oberteil 13;13a eine entsprechend zylindrische Aufsteckhülse 41; 41a besitzt. Dabei ist das Haubenoberteil 13;13a und mit diesem die ganze Absaughaube an den Gehäusevorsprung 40;40a anklemmbar.On the underside of the housing head 3; 3a is a drive shaft 4; 4a coaxial cylindrical housing projection 40; 40a. The upper part 13; 13a of the suction hood can be plugged onto this housing projection 40; 40a by the upper part 13; 13a having a corresponding cylindrical push-on sleeve 41; 41a owns. The hood upper part 13; 13a and with it the entire suction hood can be clamped to the housing projection 40; 40a.

Hierzu ist beim Ausführungsbeispiel nach den Fig. 1 - 6 ein Exzenterhebel 42 vorhanden, der von Hand betätigt wird. Der Exzenterhebel 42 ist um eine parallel zur Antriebswelle 4 verlaufende Schwenkachse 43 schwenkbar am Oberteil 13 angebracht und durchgreift mit seinem Klemmende die hier unterbrochene Steckhülse 41. Das Klemmende ist als Exzenter ausgebildet, so daß durch Verschwenken des Exzenterhebels 42 dessen Klemmpartie gegen den Gehäusevorsprung 40 geklemmt wird, so daß auch das Oberteil 13 und mit diesem die gesamte Absaughaube 7 festgehalten wird. Der Exzenterhebel 42 sitzt vor dem Maschinenkopf 3 auf der Oberseite des Oberteils 13 und ist somit leicht zugänglich. Dabei steht sein mit der Hand zu ergreifender Hebelarm zu Seite hin vor.For this purpose, an eccentric lever 42 is present in the embodiment according to FIGS. 1-6, which is operated by hand. The eccentric lever 42 is pivotably attached to the upper part 13 about a pivot axis 43 running parallel to the drive shaft 4 and engages with its clamping end through the plug sleeve 41 which is interrupted here. The clamping end is designed as an eccentric so that its pivoting part 42 is clamped against the housing projection 40 by pivoting the eccentric lever 42 is, so that the upper part 13 and with it the entire suction hood 7 is held. The eccentric lever 42 sits in front of the machine head 3 on the top of the upper part 13 and is therefore easily accessible. His lever arm, which can be gripped by hand, protrudes to the side.

Beim Ausführungsbeispiel gemäß den Fig. 7 - 9 ist dagegen eine radial durch das Haubenoberteil 13a geschraubte Klemmschraube 55 vorhanden, die zum leichteren Verdrehen aussen einen Betätigungshebel 56 trägt und mit ihrer Stirnseite gegen den Gehäusevorsprung 40a drückt. Zur Aufnahme der Klemmschraube 55 besitzt das Haubenoberteil 13a an seiner Oberseite eine Erhebung 57.In the exemplary embodiment according to FIGS. 7-9, on the other hand, there is a clamping screw 55 which is screwed radially through the hood upper part 13a and which carries an actuating lever 56 on the outside for easier turning and presses with its end face against the housing projection 40a. To receive the clamping screw 55, the hood upper part 13a has an elevation 57 on its upper side.

In jedem Falle kann der von der Aufsteckhülse 41; 41 a gebildeten Aufstecköffnung des Haubenoberteils 13;13a zur Anpassung an den Durchmesser des Gehäusevorsprungs 40;40a ein geschlitzter Einlegering 58 zugeordnet sein, der gegen den Gehäusevorsprung 40, 40a klemmbar ist. Dies ist nur bei der Variante gemäß den Fig. 7 - 9 dargestellt. Auf diese Weise kann man für Maschinen mit verschiedenen Durchmesser aufweisendem Gehäusevorsprung 40;40a eine gleiche Absaughaube verwenden, indem man den passenden Einlegering 58 in die Aufsteckhülse 41 einlegt. Die Klemmschraube 55 drückt dann gegen den geschlitzten Einlegering 58, so daß dieser gegen den Gehäusevorsprung 40a geklemmt wird. Entsprechendes gilt bei Verwendung des Exzenterhebels 42.In any case, the of the push-on sleeve 41; 41 a formed plug-in opening of the hood upper part 13; 13a to adapt to the diameter of the housing projection 40; 40a a slotted insert ring 58 can be assigned, which can be clamped against the housing projection 40, 40a. This is only shown in the variant according to FIGS. 7-9. In this way, the same suction hood can be used for machines with different housing projections 40; 40a by inserting the appropriate insert ring 58 into the push-on sleeve 41. The clamping screw 55 then presses against the slotted insert ring 58 so that it is clamped against the housing projection 40a. The same applies accordingly when using the eccentric lever 42.

Damit man zum Verdrehen des Haubenunterteils 9;9a nicht an dieses greifen muß, ist ihm eine Antriebseinrichtung zugeordnet. Hierzu ist der schon erwähnte Handgriff 6;6a als Drehgriff ausgebildet, der über ein Getriebe in treibender Verbindung mit dem Haubenunterteil 9; 9a steht. Der quer zur Antriebswelle 4;4a des Schleiftellers 5;5a gerichtete, längliche Gestalt besitzende Handgriff 6 ist also um seine eigene Achse drehbar, wobei sich gleichzeitig das Haubenunterteil 9;9a und mit diesem der Borstenkranz 8; 8a od.dgl. mitdreht. Auf diese Weise kann mit der den Handgriff 6; 6a haltenden Hand während der Schleifbearbeitung der Borstenkranz an die jeweils für die Staubabsaugung günstigste Stelle gebracht werden.So that one does not have to reach for rotating the lower hood part 9; 9a, a drive device is assigned to it. For this purpose, the already mentioned handle 6, 6a is designed as a rotary handle, which is connected in a driving manner to the hood lower part 9; 9a stands. The handle 6, which has an elongated shape and is oriented transversely to the drive shaft 4; 4a of the grinding plate 5; 5a, can thus be rotated about its own axis, the hood lower part 9; 9a and with it the bristle ring 8; 8a or the like turns with. In this way, the handle 6; 6a holding hand during the grinding process, the bristle ring is brought to the most favorable location for dust extraction.

Das Getriebe kann ein Seil- oder Riemengetriebe sein. Bei dem Seilgetriebe des Ausführungsbeispiels gemäß den Fig. 1 - 6 steht das Haubenunterteil 9 mit dem Drehgriff 6 über einen Seilzug 32 in treibender Verbindung. Dieser Seilzug 32 wird von einem Seil gebildet, das ähnlich einer achterförmigen Doppelschlaufe verläuft, deren Einzeischiaufen 33,34 rechtwinkelig zueinander stehen. Dabei ist die eine Einzelschlaufe 33 am Umfang des Haubenoberteils 13 geführt und am Haubenunterteil 9 befestigt, während die andere Einzelschlaufe 34 den Drehgriff 6 umschlingt und an diesem befestigt ist, wobei die beiden Einzelschlaufen 33,34 an einer am Haubenoberteil 13 angeordneten Umlenkeinrichtung 35, z.B. eine Rolle oder ein Umlenkbolzen, ineinander übergehen. Der Handgriff 6 trägt an seinem dem Maschinekopf zugewandten Ende eine Antriebsscheibe 36 mit gegenüber dem Handgriff 6 größerem Durchmesser, an deren Umfang bei 37 der Seilzug befestigt ist, dessen, Einzelschlaufe 34 in einer Umfangsnut der Antriebsscheibe 36 verläuft. Die Umlenkeinrichtung 35 befindet sich unterhalb des Handgriffs 6 am Oberteil 13, und zwar derart, daß das an der Umlenkeinrichtung 35 umgelenkte Seil beiderseits der Umlenkeinrichtung 35 in Höhe einer am Haubenunterteil 9 vorgesehenen Umfangsnut angeordnet ist, in der die Einzelschlaufe 33 geführt ist. Zur Befestigung des Seils am Hauben unterteil 9 steht an dessen Außenseite ein Seilhalter 38 bis über die Höhe der die Seilzug-Einzelschlaufe 33 führenden Umfangsnut des Oberteils 13 hoch. Dreht man den Handgriff 6 in die eine oder andere Richtung, wird das bei 37 am Handgriff befestigte Seil mitgenommen. Dabei verrutsch die untere Einzelschlaufe 33 in der Umfangsnut des Haubenoberteils und nimmt hierbei über den Seilhalter 38 den Scheibenkörper 14 mit.The transmission can be a rope or belt transmission. In the cable gearing of the exemplary embodiment according to FIGS. 1-6, the lower hood part 9 is in a driving connection with the rotary handle 6 via a cable pull 32. This cable pull 32 is formed by a cable which runs similarly to an eight-shaped double loop, the individual cables 33, 34 of which are at right angles to one another. Here, a single loop 33 is guided on the circumference of the hood upper part 13 and fastened to the hood lower part 9, while the other single loop 34 loops around and is fastened to the rotary handle 6, the two individual loops 33, 34 on one deflecting device 35 arranged on the hood upper part 13, for example a roller or a deflecting bolt, merge into one another. The handle 6 carries at its end facing the machine head a drive pulley 36 with a larger diameter than the handle 6, on the circumference of which the cable is attached at 37, the single loop 34 of which runs in a circumferential groove of the drive pulley 36. The deflection device 35 is located below the handle 6 on the upper part 13, in such a way that the cable deflected at the deflection device 35 is arranged on both sides of the deflection device 35 at the level of a circumferential groove provided on the lower part 9 of the hood, in which the single loop 33 is guided. To attach the cable to the lower part 9 of the hood, a cable holder 38 stands on its outside up to the height of the circumferential groove of the upper part 13 which guides the single cable loop 33. If you turn the handle 6 in one direction or the other, the rope attached to the handle at 37 is taken along. The lower individual loop 33 slips in the circumferential groove of the hood part and takes the pulley body 14 with it via the cable holder 38.

Demgegenüber ist bei dem Ausführungsbeispiel nach den Fig. 7 und 9 das Getriebe ein Zahnradgetriebe. Dabei trägt der Drehgriff 6a an seinem dem freien Griffende entgegengesetzten Endbereich ein koaxiales Zahnrad 60, das mit einem am Haubenunterteil 9a angeordneten Zahnkranz 61 in Eingriff steht. Ähnlich wie der Drehgriff 6 weist der Drehgriff 6a eine radial vorstehende Antriebsscheibe 36a auf, an deren dem freien Griffende entgegengesetzten Seite das Zahnrad 60 angeordnet ist, dessen Zähne sich am Umfang der Antriebsscheibe 36a befinden, wobei es sich beim Ausführungsbeispiel um Kegelzahnrad handelt. Das Haubenunterteil 9a steht in radialer Richtung über das Haubenoberteil 13a vor und trägt am vorstehenden Bereich den Zahnkranz 61. Dabei befindet sich der Zahnkranz 61 an der Oberseite des vorstehenden Bereichs des Haubenunterteils 9a. Beim Drehen des Handgriffs 6a dreht sich also das Haubenunterteil 9a unter dem Zahnrad 60 durch. Beim Ausführungsbeispiel sind das Zahnrad 60 und der Zahnkranz 61 einstückig an den Drehgriff 6a bzw. an das Haubenunterteil 9a angeformt, prinzipiell könnte es sich jedoch auch um gesonderte und entsprechend befestigte Teile handeln.In contrast, in the embodiment according to FIGS. 7 and 9, the transmission is a gear transmission. The rotary handle 6a carries at its end region opposite the free handle end a coaxial gear wheel 60 which is in engagement with a toothed ring 61 arranged on the lower hood part 9a. Similar to the rotary handle 6, the rotary handle 6a has a radially projecting drive disk 36a, on the opposite side of the free handle end of which the toothed wheel 60 is arranged, the teeth of which are located on the circumference of the drive disk 36a, which in the exemplary embodiment is a bevel gear. The hood lower part 9a protrudes in the radial direction above the hood upper part 13a and carries the ring gear 61 on the projecting area. The ring gear 61 is located on the top of the projecting area of the hood lower part 9a. When the handle 6a is rotated, the hood lower part 9a rotates under the gear 60. In the exemplary embodiment, the gear wheel 60 and the ring gear 61 are integrally formed on the rotary handle 6a or on the hood lower part 9a, but in principle it could also be separate and correspondingly fastened parts.

Eine weitere Möglichkeit des Drehantriebs wäre eine biegsame Welle zwischen Drehgriff und Haubenunterteil.Another option for the rotary drive would be a flexible shaft between the rotary handle and the lower part of the hood.

Bei dem Ausführungsbeispiel nach den Fig. 1 - 6 befindet sich der Drehgriff 6 am Maschinengehäuse 1 und dabei an dem Maschinenkopf 3. Zweckmäßiger ist es jedoch, wie es bei dem Ausführungsbeispiel nach den Fig. 7 - 9 dargestellt ist, daß der Drehgriff 6a am Haubenoberteil 13a angeordnet ist. Die Absaughaube kann dann einschließlich des Drehantriebs des Haubenunterteils und des Drehgriffs vollständig vorgefertigt und dann insgesamt an den Maschinenkopf angesetzt werden.In the embodiment according to FIGS. 1-6, the rotary handle 6 is located on the machine housing 1 and thereby on the machine head 3. However, as is shown in the embodiment according to FIGS. 7-9, it is more practical that the rotary handle 6a on Hood upper part 13a is arranged. The suction hood can then be completely prefabricated, including the rotary drive of the hood lower part and the rotary handle, and can then be attached to the machine head as a whole.

Wenn es sich, wie beim Ausführungsbeispiel, um ein verhältnismäßig flaches Haubenoberteil 13a handelt, kann zur Drehlagerung des Drehgriffs 6a von der Oberseite des Haubenoberteils 13a im Bereich von dessen Umfang ein Hebel-Tragelement 62 hochstehen, an dem die Drehachse sitzt. Es ist dann genügend Platz für das Umgreifen des Drehgriffs 6a mit der Hand vorhanden.If, as in the exemplary embodiment, it is a relatively flat hood upper part 13a, a lever-supporting element 62, on which the axis of rotation is seated, can stand up from the top of the hood upper part 13a in the region of the circumference thereof for the rotary mounting of the rotary handle 6a. There is then enough space for gripping the rotary handle 6a by hand.

In Fig. 7 befindet sich der Drehgriff 6a mit dem Zahnrad 60 unterhalb der Zeichenebene und wird daher von dem Maschinengehäuse 1 a verdeckt.In Fig. 7, the rotary handle 6a with the gear 60 is below the plane of the drawing and is therefore covered by the machine housing 1 a.

Eine Variante des am Haubenoberteil angeordneten Drehgriffs geht schematisch aus Fig. 10 hervor. Dieser Drehgriff 6b ist oberhalb des Haubenoberteils 13b angeordnet, wozu vom Oberteil 13b ein Drehgrift-Tragelement 45 hochsteht, zwischen dem und dem Drehgriff 6b sich eine Drehlagerung befindet. Am Drehgriff 6b ist eine Antriebsscheibe 36b beispielsweise für einen Seilzugantrieb oder mit einem Zahnrad vorhanden Des Verständnisses wegen sind in Fig. 10 noch das Haubenunterteil 9b, der Borstenkranz 8b und der Maschinenkopf 3b mit einer Bezugsziffer belegt. Bei den beiden Ausführungsbeispielen gemäß den Fig. 1 - 9 ist, wie schon erwähnt, an das Haubenoberteil 13;13a ein mit dem Absaugraum 11;11a verbundener Staubabsaugstutzen 12;12a angesetzt. Dieser kann im wesentlichen tangential vom Umfang des Haubenoberteils 13;13a abstehen, wobei er zweckmäßigerweise an der dem Drehgriff 6;6a entgegengesetzten Seite des Haubenoberteils 13;13a angeordnet ist, damit er der den Drehgriff 6;6a haltenden Hand abgewandt ist. Damit der Absaugstutzen 12;12a das Ansetzen der Absaughaube an die Maschine nicht behindert, kann die Anordnung ferner so getroffen sein, daß der Absaugstutzen 12;12a an der dem Haubenunterteil 9;9a entgegengesetzten Seite nicht nach oben über das Haubenoberteil 13;13a vorsteht. Im Haubenoberteil 13;13a kann im Bereich der Mündung des Staubabsaugstutzens 12;12a bzw. eines entsprechenden Absaugkanals eine das Vorbeischleudern des Staubes an der Mündung verhindernde Staubleitplatte 63 od.dgl. angeordnet sein, die sich von der Oberseite des Haubenoberteils 13;13a im Absaugraum 11;11 a zum Schleifteller 5;5a hin erstreckt. Die Staubableitplatte 63 od.dgl. ist in Fig. 8 gestrichelt angedeutet, sie ist an die hier nicht sichtbare Oberteilunterseite angeformt.A variant of the rotary handle arranged on the hood upper part is shown schematically in FIG. 10. This rotary handle 6b is arranged above the hood upper part 13b, for which purpose a rotary handle support element 45 stands up from the upper part 13b, between which and the rotary handle 6b there is a rotary bearing. On the rotary handle 6b there is a drive pulley 36b, for example for a cable drive or with a gear wheel. For the sake of understanding, the hood lower part 9b, the bristle ring 8b and the machine head 3b are also given a reference number in FIG. 10. In the two exemplary embodiments according to FIGS. 1-9, as already mentioned, a dust extraction connection 12; 12a connected to the hood upper part 13; 13a is attached to the extraction chamber 11; 11a. This can protrude essentially tangentially from the circumference of the upper hood part 13; 13a, it being expediently arranged on the side of the upper hood part 13; 13a opposite the rotary handle 6; 6a so that it faces away from the hand holding the rotary handle 6; 6a. So that the suction nozzle 12; 12a does not hinder the attachment of the suction hood to the machine, the arrangement can also be such that the suction nozzle 12; 12a does not protrude upwards over the hood upper part 13; 13a on the side opposite the hood lower part 9; 9a. In the hood upper part 13; 13a in the area of the mouth of the dust extraction nozzle 12; 12a or a corresponding suction channel a dust guide plate 63 or the like preventing the dust from being blown past the mouth. be arranged, which extends from the top of the hood upper part 13; 13a in the suction chamber 11; 11a to the grinding plate 5; 5a. The dust deflector plate 63 or the like. is indicated by dashed lines in Fig. 8, it is molded onto the underside of the upper part, which is not visible here.

Die Staubabsaugung vom Absaugraum nach außen könnte anstelle durch den Stutzen 12;12a auch durch einen den Drehgriff 6b durchdringenden Absaugkanal 11 b erfolgen (Fig. 10). Bei der Variante gemäß Fig. 10 verläuft der Absaugkanal 11 b also im Drehgriff 6b, sodann im Tragelement 45 und anschließend durch die Oberseite des Haubenoberteils 13b hindurch in den in diesem enthaltenen Absaugraum.The dust extraction from the extraction chamber to the outside could take place instead of through the nozzle 12; 12a also through a suction channel 11b penetrating the rotary handle 6b (FIG. 10). In the variant according to FIG. 10, the suction channel 11b thus runs in the rotary handle 6b, then in the support element 45 and then through the upper side of the hood upper part 13b into the suction space contained therein.

Um das Befestigen bzw. Wegnehmen des Schleiftellers 5;5a an bzw. von der Antriebswelle 4;4a zu erleichtern, kann diese festgestellt werden. Hierzu ist im Inneren des Haubenoberteils 13;13a eine von außen her betätigbare, federbelastete Arretierplatte 46;46a quer zur Antriebswelle 4;4a hin und her verschieblich geführt, die in ihrer wirksamen Stellung die Antriebswelle 4;4a gabelartig umgreift und dabei drehfest festhält. Die dargestellte Arretierplatte 46;46a weist einen Gabelschlitz 47 (siehe Fig. 5) auf, der einen Bereich 48 mit größerem Durchmesser als die Antriebswelle 4 und einen Bereich 49 mit einem die Antriebswelle festhaltenden Durchmesser besitzt. Beim üblichen Betrieb der Maschine befindet sich diese Arretierplatte 46;46a in der Stellung, in der die Antriebswelle 4,4a den Gabelschlitzbereich 48 größeren Durchmessers durchdringt. Will man die Antriebswelle zum Auswechseln des Schleiftellers feststellen, verlagert man die Arretierplatte, so daß der Bereich 49 des Gabelschlitzes 47 auf die Antriebswelle 4;4a gelangt und diese festgehalten wird. Die beiderseits der Antriebswelle verlaufenden Gabelschenkel 46',46";46'a,46"b sind auch aus den Fig. 2 und 7 ersichtlich. Da die Arretierplatte 46a des Ausführungsbeispiels gemäß den Fig. 7 - 9 der Arretierplatte 46 entsprechen kann, sind in Fig. 8 zu ihren Einzelheiten keine Bezugsziffern eingetragen worden.In order to facilitate the attachment or removal of the grinding plate 5; 5a to or from the drive shaft 4; 4a, this can be determined. For this purpose, a spring-loaded locking plate 46; 46a, which can be actuated from the outside and can be moved back and forth transversely to the drive shaft 4; 4a and which, in its active position, engages around the drive shaft 4; 4a in a fork-like manner and thereby holds it in a rotationally fixed manner. The illustrated locking plate 46; 46a has a fork slot 47 (see FIG. 5) which has an area 48 with a larger one Diameter than the drive shaft 4 and a region 49 with a diameter holding the drive shaft. During normal operation of the machine, this locking plate 46; 46a is in the position in which the drive shaft 4, 4a penetrates the fork slot area 48 of larger diameter. If you want to determine the drive shaft to replace the grinding plate, you move the locking plate so that the area 49 of the fork slot 47 reaches the drive shaft 4, 4a and this is held. The fork legs 46 ', 46 ";46'a, 46 " b running on both sides of the drive shaft can also be seen from FIGS. 2 and 7. Since the locking plate 46a of the exemplary embodiment according to FIGS. 7-9 can correspond to the locking plate 46, no reference numbers have been entered in FIG. 8 for its details.

In Höhe der Arretierplatte ist die Antriebswelle mit Abflachungen für den Angriff der Gabelschenkel versehen, in Fig. 7 ist diese Antriebswellenpartie bei 65 dargestellt.At the level of the locking plate, the drive shaft is provided with flats for the attack of the fork legs, in Fig. 7 this drive shaft section is shown at 65.

Die Arretierplatte 46;46a ist an geeignet im Oberteil 13;13a angeordneten Lagerstegen od.dgl. hin und her verschiebbar gelagert. In Fig. 7 sind zwei solche Lagerstege 66, 67 angedeutet. Sie ist ferner federbelastet, wozu eine einerseits mit der Arretierplatte 46;46a und andererseits mit dem Haubenoberteil verbundene Feder 50 dient, die nur in den Fig. 5 und 6 dargestellt ist. Diese Feder 50 hält die Arretierplatte in der Stellung, in der die Antriebswelle 4;4a den Schlitzbereich 48 größeren Durchmessers durchdringt. Zum Feststellen der Antriebswelle zieht man aussen an einer mit der Arretierplatte 46; 46a verbundenen Handhabe 51;51a entgegen der Kraft der Feder 50.The locking plate 46; 46a is or the like on suitably arranged in the upper part 13; 13a. slidable back and forth. 7 two bearing webs 66, 67 are indicated. It is also spring-loaded, for which purpose a spring 50, which is connected on the one hand to the locking plate 46; 46a and on the other hand to the hood upper part, is used, which is only shown in FIGS. 5 and 6. This spring 50 holds the locking plate in the position in which the drive shaft 4; 4a penetrates the slot area 48 of larger diameter. To lock the drive shaft, pull on the outside with the locking plate 46; 46a connected handle 51; 51a against the force of the spring 50.

Ferner ist es zweckmäßig, daß das Haubenunterteil 9;9a am Umfang eine Durchbrechung 68 (siehe Fig. 9) für den Durchgriff eines mit dem Schleifteller 5;5a in Eingriff gelangenden Werkzeugs aufweist, mit dem man den auf die Antriebswelle aufgeschraubten Schleifteller bei festgehaltener Antriebswelle von dieser lösen kann. In Fig. 9 befindet sich diese Unterbrechung 68, die Schlitzgestalt hat, am nach unten hin abstehenden Umfangsrand des Haubenunterteils und dabei im Bereich der Borstenleiste 53, die hier durch die Durchbrechung 68 zum Teil sichtbar ist.It is also expedient that the hood lower part 9; 9a has an opening 68 (see FIG. 9) on the circumference for the passage of a tool engaging with the grinding plate 5; 5a, with which the grinding plate screwed onto the drive shaft is held while the drive shaft is held in place can detach from this. In Fig. 9, this interruption 68, which has the shape of a slot, is located on the circumferential edge of the lower part of the hood projecting downwards and in the region of the bristle strip 53, which is partially visible here through the opening 68.

In Höhe der Durchbrechung 68 sitzt an der Oberseite des Schleiftellers eine fest angeordnete Mutter 70, in die die Antriebswelle eingeschraubt ist und mit der das Werkzeug in Eingriff gelangt.At the level of the opening 68, there is a fixed nut 70 on the upper side of the grinding plate, into which the drive shaft is screwed and with which the tool comes into engagement.

Prinzipiell könnte die Absaughaube auch ein maschinenfestes Teil sein, beispielsweise indem das Haubenoberteil einstückig oder durch eine feste Verbindung an das Gehäuse angesetzt ist. Es ist jedoch ersichtlich, daß eine lösbar befestigte Absaughaube zweckmäßiger ist.In principle, the suction hood could also be a machine-fixed part, for example in that the hood top part is attached to the housing in one piece or by a fixed connection. However, it can be seen that a detachably attached suction hood is more appropriate.

Claims (35)

1. A disc grinder designed as a hand tool, with a grinding disc (5, 5a) driven by a drive shaft (4, 4a) to perform a rotary movement, with a handle (6, 6a, 6b) projecting away from the machine casing (1, 1 a), and with a dust extraction device which has a suction hood (7, 7a) covering the upper side of the grinding disc at a distance, overlapping over the circumference of the grinding disc, containing a suction space and firmly attached to the machine casing (1, 1a), with an annular brush (8, 8a, 8b) or the like, sitting on a workpiece on the underside, the annular brush, leaving free a visual area towards the workpiece, extending over only a portion of the circumference of the suction hood, and the grinding dust passing between the circumference of the grinding disc and the annular brush (8, 8a, 8b) or the like, through to the suction space, characterised in that the suction hood (7; 7a) contains a lower portion (9; 9a; 9b) mounted to rotate, independently of the grinding disc (5; 5a), on the upper portion (13; 13a; 13b) which produces the connection to the machine casing (1; 1a) said lower portion (9; 9a; 9b) also carrying the annular brush (8; 8; 8b), and that the handel (6; 6a; 6b) is a rotary handle, which is in a driving connection via a gear system (32; 60; 61) with the lower portion of the suction hood.
2. A disc grinder according to Claim 1, characterised in that the gear system is a toothed gearwheel system.
3. A disc grinder according to Claim 2, characterised in that the rotary handle (6a) carries on its terminal portion opposite to the free end of the handle a coaxial gearwheel (60), which engages with a sprocket (61) located on the lower hood portion (9a).
4. A disc grinder according to Claim 3, characterised in that the lower hood portion (9a) projects radially over the upper hood portion (13a) and carries the sprocket in the projecting region.
5. A disc grinder according to Claim 4, characterised in that the sprocket (61) is located on the upper side of the projecting region of the lower portion (9a).
6. A disc grinder according to one of Claims 3 to 5, characterised in that the toothed gearwheel (60) and/or the sprocket (61) is integrally formed on the rotary handle (6a) or on the hood lower portion (9a).
7. A disc grinder according to Claim 1, characterised in that the gear system is a cable or belt gearing system.
8. A disc grinder according to Claim 7, characterised in that the cable or belt gearing system has a figure-of-eight-shaped double belt loop with individual loops (33, 34) standing at right angles to one another, of which one individual loop (33) is guided on the circumference of the upper portion (13) of the suction hood (7) and attached to the lower hood portion (9), while the other individual loop (34) passes round the rotary handle (6) and is attached thereto, both individual loops (33, 34) merging into one another at a diversion device (35) located on the upper portion (35) of the suction hood.
9. A disc grinder according to one of Claims 1 to 8, characterised in that the rotary handle (6a; 6b) is located on the upper portion (13a; 13b) of the suction hood.
10. A disc grinder according to one of Claims 1 to 9, characterised in that a dust extraction nozzle (12; 12a) connected with the suction space (11; 11 a) is mounted on the upper portion (13; 13a; 13b) of the suction hood.
11. A disc grinder according to Claim 10, characterised in that the dust extraction nozzle (12; 12a) projects substantially tangentially away from the circumference of the upper hood portion (13; 13a, 13b).
12. A disc grinder according to Claim 11, characterised in that the dust extraction nozzle (12; 12a) is located on the side of the upper hood portion (13; 13a, 13b) opposite to the rotary handle (6; 6a; 6b).
13. A disc grinder according to one of Claims 10 to 12, characterised in that the suction nozzle (12; 12a) does not project upwards over the upper hood portion, on the side opposite to the upper hood portion.
14. A disc grinder according to one of Claims 1 to 9, characterised in that dust extraction from the suction space to the exterior is effected through a suction duct passing through the rotary handle (6b).
15. A disc grinder according to one of Claims 1 to 14, characterised in that there is located, at the upper hood portion (13; 13a; 13b), in the region of the mouth of the dust extraction nozzle (12; 12a) or of the suction duct (11 b), a dust deflector plate (63) or the like, which prevents the dust from being impelled past the said mouth, said dust deflector plate (63) or the like extending from the upper side of the upper hood portion (13; 13a; 13b) in the suction space towards the grinding disc.
16. A disc grinder according to one of Claims 1 to 15, characterised in that the suction hood (7; 7a) is a supplementary part, located between the grinding disc (5; 5a) and the machine casing (1; 1a), and releasably attached to the latter.
17. A disc grinder according to Claim 16, characterised in that the upper hood portion (13; 13a) may be thrust on to a cylindrical casing projection (40; 40a) and clamped securely thereto.
18. A disc grinder according to Claim 17, characterised in that there is associated with the push-on opening of the upper hood portion (13; 13a), in order to adapt said opening to the diameter of the casing projection (40; 40a), a slotted spacer ring (58), which can be clamped against said casing projection.
19. A disc grinder according to Claim 10 or 18, characterised in that the upper hood portion (13; 13a; 13b) is in the shape of a flat box, which has on its upper side a cylindrical push-on tube (41; 41 a).
20. A disc grinder according to one of Claims 1 to 19, characterised in that there is located on the upper hood portion (13; 13a) a locking device for securing the drive shaft (4; 4a), an externally actua- ble, springloaded locking plate (46; 46a) being more suitably guided to move to and for transversely to the drive shaft (4; 4a), said locking plate (46; 46a), in its effective position, surrounding the drive shaft in a forked manner, thus securing it against rotation.
21. A disc grinder according to Claim 20, characterised in that the lower hood portion (9a) has on its circumference a passage (68) allowing access to a tool moving into engagement with the grinding disc (5a).
22. A disc grinder according to one of Claims 1 to 21, characterised in that the annular brush (8; 8a; 8b) or the like is spiral in configuration.
23. A disc grinder according to one of Claims 1 to 22, characterised in that the lower hood portion (9a) has a rotating rim surrounding the grinding disc (5a), the rim portion (52) supporting the annular brush or the like being initially offset radially.
24. A disc grinder according to one of Claims 1 to 23, characterised in that the lower hood portion (9a) is rotatably mounted on the lower side of the upper portion (13a) in the region of its outer circumference.
25. A disc grinder according to one of Claims 1 to 24, characterised in that the annular brush (8; 8a, 8b) or the like extends over an angle of arc of about 1800 or less.
26. A disc grinder according to one of Claims 1 to 25, characterised in that the annular brush (8a) or the like is formed by a strip (53) thrust into the lower portion (9a).
27. A disc grinder according to one of Claims 1 to 26, characterised in that the lower hood portion (9) has a disc body (14), lying opposite the upper side of the grinding disc and covering the suction space (11), located thereabove in the upper hood portion (13), from the grinding disc (5), said disc body (14) containing, in the angle of arc of the annular brush (8) or the like, a passage (15) allowing the grinding dust to pass to the suction space (11).
28. A disc grinder according to Claim 27, characterised in that the passage (15) extends over an angular range substantially corresponding to that of the annular brush (8).
29. A disc grinder according to Claim 27 or 28, characterised in that the suction space (11) is open towards the disc body (14) via an annular surrounding inlet opening (17), and that the passage (15) is in the shape of a ring section having a radius substantially equal to that of the inlet opening (17).
30. A disc grinder according to one of Claims 27 to 29, characterised in that there is located on the lower side of the disc body (14) a seal member (28) projecting towards the grinding disc (5), sealing from the outside the region of the passage (15) on the side opposite to the annular brush (8) in the plane parallel to the disc body (14).
31. A disc grinder according to Claim 30, characterised in that the seal member (28) is formed by a seal web or a brush strip.
32. A disc grinder according to Claim 30 or 31, characterised in that the seal member (28) extends from the region of one end of the annular brush (8) or the like to the region of the other end of the annular brush or the like, thus extending around the passage (15).
33. A disc grinder according to Claim 32, characterised in that the seal member (28) extends in an arcuate manner around the region of the central disc body.
34. A disc grinder according to Claim 33, characterised in that the seal member (28) extends in a spiralling manner, with a radius becoming smaller in the direction of rotation.
35. A disc grinder according to Claim 33 or 34, characterised in that the seal member (28), at the forward end seen in the direction of rotation, forms a passage (31) open in the direction of rotation.
EP88109006A 1987-07-20 1988-06-06 Disk wheel grinder Expired - Lifetime EP0300180B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88109006T ATE58858T1 (en) 1987-07-20 1988-06-06 DISC GRINDING MACHINE.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3723947 1987-07-20
DE3723947 1987-07-20
DE3805991A DE3805991A1 (en) 1987-07-20 1988-02-25 PLATE GRINDING MACHINE
DE3805991 1988-02-25

Publications (2)

Publication Number Publication Date
EP0300180A1 EP0300180A1 (en) 1989-01-25
EP0300180B1 true EP0300180B1 (en) 1990-12-05

Family

ID=25857757

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88109006A Expired - Lifetime EP0300180B1 (en) 1987-07-20 1988-06-06 Disk wheel grinder

Country Status (4)

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US (1) US4905421A (en)
EP (1) EP0300180B1 (en)
JP (1) JP2599437B2 (en)
DE (2) DE3805991A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4306009A1 (en) * 1993-02-26 1994-09-01 Fein C & E Grinding machine

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4422247A1 (en) * 1994-06-24 1996-01-04 Fraunhofer Ges Forschung Guide and handle for hand=held appliance
US5713785A (en) * 1997-01-17 1998-02-03 Linax Co., Ltd. Vacuum type portable sander
DE10162630A1 (en) * 2001-12-20 2003-07-10 Hilti Ag Grinder with a suction hood
GB2443199B (en) * 2006-10-27 2008-12-31 David Vincent Byrne A chaser comprising a universal connection means
US7896041B2 (en) * 2007-02-02 2011-03-01 Rockler Companies, Inc. Dust collection attachment
DE102008010977A1 (en) * 2008-02-25 2009-08-27 Robert Bosch Gmbh Hand tool, in particular hand-guided grinding machine
DE102008024801A1 (en) * 2008-05-23 2009-11-26 INOTEC GmbH Transport- und Fördersysteme Hand tool for material-removing machining of a workpiece or component surface
JP5947110B2 (en) * 2012-05-25 2016-07-06 Dmg森精機株式会社 Dust collection attachment for cutting, dust collection duct for machine tool, tool holder for machine tool and machine tool
EP2730371B1 (en) * 2012-11-13 2016-05-18 Siemens Aktiengesellschaft Device for setting a predetermined radial gap size of the blades of a turbomachine
DE102016106782A1 (en) * 2016-04-13 2017-10-19 Festool Gmbh Hand machine tool with a cover device
DE102018111836A1 (en) * 2018-05-16 2019-11-21 Festool Gmbh Mobile machine tool for machining a surface
AU2018101054B4 (en) * 2018-07-30 2019-04-11 Norton, Mathew Raymund MR Toggle Latch Quick Release - Floating Skirt Dust Shroud
RU2758353C1 (en) * 2021-04-05 2021-10-28 федеральное государственное бюджетное образовательное учреждение высшего образования «Белгородский государственный технологический университет им. В.Г. Шухова» Centrifugal disc grinder

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
FR2365410A1 (en) * 1976-09-27 1978-04-21 Robert Jean Rotary disc power sander with dust extraction - has adjustable vacuum box covering fraction of back of disc to extract dust through holes in disc
DE2741325C3 (en) * 1977-09-14 1980-03-06 Miksa Windsor Ontario Marton (Kanada) Hand-held disc grinder
DE8322326U1 (en) * 1983-02-04 1983-12-22 Atlas Copco AB, Nacka ROTATING GRINDING TOOL WITH SAFETY COVER AND DUST COLLECTING DEVICE
DE3512190A1 (en) * 1985-04-03 1986-10-09 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Grinding or brushing unit which is driven by an electric motor
DE8523993U1 (en) * 1985-08-21 1985-11-07 Paul Peter KG, 5900 Siegen Protective and suction cover
US4683682A (en) * 1986-09-19 1987-08-04 Dresser Industries, Inc. Safety lever for portable power tool
US4765099A (en) * 1986-12-11 1988-08-23 Tanner John G Sanding and dust collecting apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4306009A1 (en) * 1993-02-26 1994-09-01 Fein C & E Grinding machine

Also Published As

Publication number Publication date
JP2599437B2 (en) 1997-04-09
US4905421A (en) 1990-03-06
JPH01109072A (en) 1989-04-26
DE3805991A1 (en) 1989-02-02
DE3861223D1 (en) 1991-01-17
EP0300180A1 (en) 1989-01-25

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