Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B24—GRINDING; POLISHING
  • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
  • B24D9/00—Wheels or drums supporting in exchangeable arrangement a layer of flexible abrasive material, e.g. sandpaper
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B24—GRINDING; POLISHING
  • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
  • B24D13/00—Wheels having flexibly-acting working parts, e.g. buffing wheels; Mountings therefor
  • B24D13/02—Wheels having flexibly-acting working parts, e.g. buffing wheels; Mountings therefor acting by their periphery
  • B24D13/10—Wheels having flexibly-acting working parts, e.g. buffing wheels; Mountings therefor acting by their periphery comprising assemblies of brushes
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B24—GRINDING; POLISHING
  • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
  • B24D13/00—Wheels having flexibly-acting working parts, e.g. buffing wheels; Mountings therefor
  • B24D13/20—Mountings for the wheels

Definitions

• the invention relates to a rotary tool consisting of a novel drive hub N and replaceable novel tool sleeves H, such as in particular emery sleeves and / or brush rings.
• Abrasive sleeves and brush rings have hitherto been predominantly clamped onto rigid or elastic clamping devices, which can be radially expanded or axially clamped, for example, or rigidly clamped on a rigid drive hub as a segment arrangement or as a ring.
• rigid or elastic clamping devices which can be radially expanded or axially clamped, for example, or rigidly clamped on a rigid drive hub as a segment arrangement or as a ring.
• radially expandable drive hubs, clamping elements or a clamping rubber for example with possibly two clamping cones, are axially contracted by means of a screw connection and pressed against the inner circumferential surface of the tool sleeve. The tool sleeve is carried by friction.
• the brush belt is therefore operated in DE-OS 31 18 932 with a rubber-elastic, radially expandable tensioning device.
• the drive force is transmitted by friction.
• the clamping of the brush ring is relatively cumbersome. In the event of insufficient tension or reduced friction, for example due to oil contamination on the clamping surfaces, slipping or slipping of the brush ring cannot be ruled out.
• the bristles flexibly supported in the clamping device in the elastically supported brush band have a good abrasion effect due to the remaining flexibility, but their flexibility is limited and, for example in the case of strongly profiled workpieces, is overwhelmed due to the tensioning of the rubber core and the brush band.
• brush belt damage can occur, which would impair safety and create dangers.
• a "stabilizing bush” inserted into the inside of the brush band should prevent the brush ring from being squeezed together due to the axial tension.
• the rigid bushing not only impairs the radial mobility of the brush belt inward and thus the flexibility of the brush belt, but also the intended one
• the bristles lose their flexibility on the axial webs and therefore bend permanently. As a result, these bristles lose their effectiveness and service life and break off easily, for example when the direction of rotation changes. Because of the axial ring grooves in the flanges and because of the shark victories, the elastic storage and angular adjustability of the bristles, which are possible as a result of the brush band, are again severely restricted and in some cases nullified.
• the axial webs abutting the bristle bodies considerably shorten the effective bristle bending length and thus cut the flexibility of the bristles, which is essential for this type of brush and which is essential for its function, by severely hindering the elasticity of the bristles, their free bending length and their possibility of inclination.
• the flexibility of the brush is also greatly reduced by the rigid inner stabilizing bushing and by the form-fitting rigid edge clamping of the brush ring in the axial flange ring grooves, to the detriment of the brush effect. This also does not give the brush ring an elastic flexibility towards the brush center axis.
• the clamping device according to DE-OS 31 41 983 has clamping disks or flanges which are designed with a diameter larger than the tool sleeves to be used. This means that the edges of the tensioning discs are annoying when using emery sleeves, especially when working on surfaces, as are the overlapping axial webs.
• the overlapping axial webs serve unintentionally the drive in which they lie against the bristle groups during operation, so that the bristles bend at the edges of the axial webs and break off when the direction of rotation changes, which is particularly important leads to dangers when used with high-speed machines such as angle grinders.
• the movement angle of the bristles in the circumferential direction is also significantly restricted and the bending-active bristle length is considerably shortened.
• the bristles like the work surface of emery sleeves, remain inoperative.
• T DE-OS 36 05 855 relates to a grinding tool for profiled strips made of wood, two clamping elements being assigned to each of the base bodies carrying the grinding segments for fixing the grinding segments, which engage behind projections on the grinding segments. It is therefore not a drive device for rotary tools, such as emery sleeves or brush rings, which is formed from two flanges, and this document also gives no indication as to how tensioning, screwing and kinking of bristles is prevented in such a drive device, or a tool sleeve is secure could be kept from the inside.
• DE-OS 29 30 589 is concerned with a rotating wiper, the two flanges of which are fastened to one another by riveting or welding connecting pins, that is to say they are inextricably linked.
• the DE-GM document 88 C5 136 also shows a rotary brush, as it is already described in the main claim of DE-OS 31 18 932, except for the mention of the production-related bristle-free band edges.
• a rotary brush which is formed from individual brush ring body segments arranged next to one another in the circumferential direction, each of which abuts radially from the outside snugly on the lateral surface of a rigid hub and thereby with an axially extending ring body - Ribs, which have a narrow foot and a wider head, are positively anchored in the corresponding axial grooves of the hub.
• the individual, initially flat brush segments consisting of bristles in a flexible brush band with a flat cross-section, are attached with their brush backs to individual, also initially flat ring body segments made of flexible polymeric material with a flat cross-section.
• the ring body segments facing away from the brush, carry the ribs that widen with the distance. Only when the brush-ring body segments are installed on the hub are the previously flat segments arched so that they lie snugly on the hub peripheral surface.
• the flexibility of the ßür ⁇ t p ⁇ and ring body material only serves this purpose, which is ineffective after installation in operation. Only several segments arranged side by side over the circumference finally result in a rotating brush around the entire hub circumference.
• flanks of the radially aligned annular body ribs rest positively on the flanks of the radial longitudinal grooves of the hub, so that this positive rib-groove anchoring the brush-ring body curvature around the hub circumference and in particular the radial attachment of the segments to the Mainly effects and ensures the hub against centrifugal force.
• a noticeable radial mobility of the segments in the assembled state due to the flexibility of their material is no longer given because of the full contact with the outer surface of the rigid hub and it is also not intended or desired in this known case.
• the rotary tool should work with a high level of safety, dispense with any clamping device, be manageable without complex assembly processes and, especially during operation, the radial bristle band flexibility should be retained as far as possible to achieve maximum work efficiency and the highest possible speeds should be managed.
• the previous drive arm arrangement radially outside the tool sleeve leads in the previously known design to mutual rotation of the drive device and the tool sleeve, ie slippage and reduced power, it leads to unfavorable, punctual positive locking with the bristles and their unadjusted harmful movement impairment.
• the tool sleeve drive solution according to the invention offers greater security, effectiveness, elasticity and flexibility, is more versatile and more effective, ie more efficient, simple, time-saving and reliable.
• a snap connection for example arranged centrally in axial approaches, is provided, as is shown in the drawing as an exemplary embodiment.
• the snap connection can also be arranged, for example, on the driver arm ends or on a central shaft, and the design as a bayonet-type snap lock is an example of the possible embodiments of such snap connections.
• the inventive teaching discloses preferably to provide a positive and unlockable snap connection which is possible, for example within the central approach, but also outside on the central approach and / or on the driver arms and which can only be unlocked again by means of unlocking means such as a pull-operated mechanism.
• driver elements are provided on the tool sleeve, which are arranged coaxially with the engaging driver arms of the drive, whereby the drive is positive and thus slip-free, safer and more reliable.
• Such a brush belt bearing which always remains flexible during operation, was already considered important in the prior art according to DE-OS 31 18 932 and was aimed at in the form of an adjustable, elastic spring-back brush belt support on the brush belt carrier for a better working effect, but could only partially realized.
• such a rotary tool for example as a rotary brush
• a rotary tool for example as a rotary brush
• substantially improved according to the invention that is to say the flexibility of the brush band during use and, at the same time, the elastic, resilient inclination setting of the bristles in engagement should be further improved by avoiding all measures which counteract flexibility.
• the radial or axial brush band bracing according to DE-PS 31 18 932 or DE-PS 31 41 983 has been dispensed with; according to the invention, a rigid inner radial brush band support, such as that provided by the "stabilizing bushing", has been avoided 16 "according to DE-PS 31 41 983 was provided, according to the invention a partially form-fitting tensioning band fixation by the" ring grooves 6 "according to DE-PS 31 41 983 was avoided and according to the invention it is also an unfavorable, tangential Bristle system on the overarching "Axialstegen 7" according to DE-PS 31 41 983 avoided.
• the new rotary tool for example as a brush
• the radial resilience and inclinability as well as the elastic mounting or mounting of the bristles brings about the elementally important bending elasticity and elastic resilience radially and at an angle to the center axis of the brush.
• the elasticity can be adapted by the ring body, which can be firmly connected to the brush band and can be selected in terms of its elasticity, and can cause the bristles to function resiliently, just as there can be a radial displacement of the bristles without the inner ring body, which establishes a balance between the centrifugal forces acting thereon and the external working pressure forces.
• the resetting property according to the invention ie flexibility in the direction of the brush center axis, the bristles, of bristle groups, of the brush band has been significantly increased and ensured according to the invention.
• Essential to this is the flexible brush band and possibly the ring body made of flexible band, whereby it is meant that the bands remain flexible during work, i.e. not only consist of flexible material, but are also arranged so that the flexibility remains effective when working, ie it ring bodies made of flexible tape are meant, which remain just as effective and flexible in work and do not become more inflexible through clamping devices.
• Brush band drive and brush band holding and brush band receiving device enables, according to the invention and in contrast to the entire known prior art, that a safety rotary brush is present when working, in which the inner circumference of the flexible brush band according to the invention or the flexible ring body without an immediate physical inner support remains, especially in the form of a rigid inner body support that noticeably influences flexibility.
• the brush belt with or without ring body is only indirectly and radially fixed via the loops located radially further inwards, but without any significant impairment of the belt flexibility.
• the brush strip with or without a flexible ring body can bend radially inwards and outwards when working in the area of the relatively rigid bristles that are currently in engagement, due to the noticeable radial mobility that, among other things, the inclination of the bristles currently in engagement with the associated ones Brush band circumferential tangent on the bristle base can be adjusted flexibly, ie resiliently, and can change the angle of movement of the bristles in the circumferential direction. Radial displaceability of the bristles can also be provided.
• the rotary tool according to the invention provides, inter alia, a brush band with internal loops for better use and preservation of the radial brush band flexibility when working with the brush band, for increasing safety and for a form-fitting brush band holder on the drive while avoiding any tensioning device.
• the known device works in a frictional manner, the rubber core tensions the brush band radially from the inside with a reduced impairment of the brush band flexibility remaining when working, the brush band is no longer held in the event of damage and the known disadvantages of complex tensioning are present.
• Another particularly important feature of the invention is the positive drive of the tool sleeve with the aid of driver arms, which interact positively with the tool sleeve, either by driver elements of the tool sleeve, which can be loop-shaped, for example, or by contact in the circumferential direction, for example on the bristle tufts, which is why the special cross-sectional contour of the driver arms is designed to be edge-free in a specially adapted manner.
• the positive drive driving of the tool sleeve by the driver arms prevents a reduction in performance due to the mutual rotation of the drive device and the tool sleeve, for example as a brush ring.
• the bristles in the action radius can be optimally movable and their action unimpeded for brush rings come.
• the securing flange prevents the tool sleeve from sliding axially and is simply pushed on, whereby it snaps into place by means of a snap connection, such as an axially operable bayonet lock or the like. Tedious screwing and tightening is no longer necessary. This means that you can work safely in both directions of rotation.
• the securing element can only be removed again by activating unlocking means such as, for example, actuating an unlocking device, for example an unlocking lever, so that inadvertent loosening is prevented in this way.
• unlocking lever for example, can preferably be designed as a pull lever and sunk inside the tool contour.
• the snap connection can be provided on the driver ends or on a central shaft and engage.
• Internally located central approaches are advantageous, on which the snap mechanism, for example as a bayonet mechanism, can be embedded on the outer circumference or in the cavity, for example, which can interlock positively and only fit together if the drive arms also overlap with the associated recesses or projections of the opposite flange .
• FIG. 1 shows a rotary tool according to the invention with drive hub (N) with drive flange, rotary brush and locked securing flange in section,
• TT 5 shows the top view of a safety tool sleeve according to the invention in the form of a safety rotary brush ring with various possible driver elements 33, preferably designed as loops 34, inside the brush ring 36,
• FIG. 6 shows a safety tool sleeve according to the invention in the form of a brush band ring 31 with a radially arranged and firmly connected ring body 35 and driver elements 33 in different designs, preferably designed as loops 34,
• Fig. 1 shows a safety tool sleeve according to the invention in the form of a
• Brush ring 36 made of brush strip 31 with a firmly connected inner, resiliently soft inner filling 31, which has loop-shaped recessed openings 38 as driver elements,
• FIG. 8 shows a section through a rotary tool with a tool sleeve according to FIG. 1
• Fig. 1 an embodiment of a rotary tool according to the invention is shown in section, in which the drive flange 1 forms the actual tool sleeve carrier.
• the motor connection 3 is firmly connected to the drive flange 1 and at the same time represents the central axial extension 6.
• the extension 6 is drilled on the inside and accommodates the snap connection locking mechanism attached in the securing flange 2.
• the shoulder 6 is provided with an annular groove 9 which is recessed at right angles and which decreases in radius in the direction of the motor connection 3.
• the securing flange 2 is pushed on, the attachment 7 is pushed against the attachment 6 in a manner preventing rotation, and the closure elements 10 arranged in the cavity of attachment 1 are immersed in the attachment 6 and locked into the annular groove 9.
• the driver arms 4 are designed, for example, as tubes which are guided through the radially inner loop-shaped driver elements 14 of the tool sleeve H and thereby receive the projections 5 on the securing flange 2 in a form-fitting manner.
• Fig. 2 shows the securing flange 2 with the unlocking lever 11 pulled.
• the hollow cylinder 13 has the locking elements 10 of the spring sleeve 8 constricted so far that their circumferential diameter is smaller than the inside diameter of the extension 6.
• the unlocking element 11 cannot remain in the position shown .
• the radially acting spring forces of the closure elements 10 force the unlocking element 11 back into the starting position or into the securing position with the spring sleeve 8 spread and the closure elements 10 protruding radially outside.
• the driver arms 4 receive the tool sleeve H radially from the outside, ie the driver arms 4 lie radially outside the sleeve diameter.
• the axial webs or axial projections or driver arms 4 are in a form-fitting manner against bristle groups. If the cross-sectional contour of the driving arms 4 is not adapted, the bridges' movement angle in the circumferential direction and in the direction of the axis of rotation could be narrowed by the overlapping webs, and the bending-active bristle length could thus be shortened considerably. According to the invention, this is achieved by a specially adapted edge-free, preferably convex on all sides
• Driver arms 4 prevents the reduction in performance compared to the known designs by mutual rotation of tool sleeve H and drive hub N. Because the cross-sectional contour of the driver arms 4 is adapted to the deformation contour of the brush band and bristles that arise during operation of the tool, the bristles and the brush band can be in action Flexible and elastic operational deformation and position take largely unhindered and are therefore optimally used.
• the securing flange 2 prevents the tool sleeve H from sliding axially from the drive hub N when both flanges 1, 2 are detachably fastened to one another, for example by means of a snap connection S, a large number of
• the radially outer driver arms 4 are on their radially inner side and on their two adjoining side areas centric bracket and for the rotary drive of the tool sleeve H edge-free and with a special cross-sectional contour in the circumferential direction.
• the driver arms 4 can be designed with essentially no edges in cross-section and, at least in the directions of action acting on the tool sleeve H, preferably essentially with a convex circumferential ruler, that is to say, for example, essentially oval or elliptical or bean-shaped in all effective areas, the radially outside lying side preferably has a smaller radius of curvature than the radius of the tool sleeve H or the drive hub N or the securing flange 2. Furthermore, the convex radial outside can at least partially extend beyond the circumference of the drive hub N and the securing flange 2.
• the edge-free course due to the transitional curvature between the radially inner and the radially outer driving arm cross-sectional contour lies in radius ranges which correspond to the diameter of the bristles to be used, or a multiple thereof in the range of two to five times the bristle diameter.
• This transition curvature can particularly preferably be designed as a curve, which particularly advantageously corresponds, for example, to the bending line function of a bending beam clamped in at one end and at the other side with transverse force, the clamping corresponding to the bristle holder located radially on the inside in the brush band and the transverse force being applied radially further out , for example according to the circumferential force that occurs when working on the free ends of the bristle tips.
• Other transition curvatures such as spiral or involute contours can also be regarded as advantageous.
• An embodiment of the invention with such an edge-free special driver arm cross-sectional contour according to the invention is shown in the drawing according to FIG. 4.
• This embodiment has a drive flange 1, on which at least three driver arms 4, which are evenly distributed over the circumference and extend parallel to one another and parallel to the axis of rotation, are arranged in the radially outer region of the drive flange 1 on the end face, axially on the inside, axially aligned with the securing flange 2.
• a central extension 6 can preferably be provided, which is drilled inside, for example, and on which the snap connection S can be arranged.
• a securing flange 2 with a handle 12, preferably designed as a pull knob, is provided in parallel to the drive flange 1, axially offset in the direction of the axis of rotation 2, a securing flange 2 with a handle 12, preferably designed as a pull knob, is provided.
• the securing flange In its radiai outer area, the securing flange has holding devices 15 for the driving arms 4 in the form of recesses 15, which are positively adapted to the contour of the driving arms 4, for axially and radially immovable but releasable fixing of the driving arms 4.
• the handle 12 preferably designed as a pull knob, can unlock the snap connection S between the drive flange 1 and the securing flange 2, for example in the interior of the attachment 6, in which a snap means released by pulling the handle 12 in the direction of the axis of rotation Z of the rotary tool is released and can be unlocked.
• the driver arms 4 are designed according to the invention in cross section without edges and convex on all sides, for example oval, in such a way that they have a convex radial outer side 11 and, compared to the prior art, also convex, radially inner side 16, preferably with a larger radius of curvature than the outer side 11.
• the outside 11 has a smaller radius of curvature than the radius of the securing flange 2 or the driving flange 1 or the tool sleeve H and extends, for example, partially beyond the circumference of the securing flange 2.
• tool sleeves H which can be received radially on the outside, for example brush rings, which have no bristles in the circumferential direction in the area of the driving arms 4, can be accommodated, in that the circumference of the tool sleeve H can radially rest against the radially inner convex area 16.
• the bristles protruding radially outward come partially to the side on the edge-free, rounded side area 18 of the driving arm provided with an adapted curvature contour for positive engagement, whereby the tool sleeve drive is effected.
• the flexible brush band and the adjacent bristles are not kinked but are adapted in their free, stress-related deformation in the deformation end region.
• the bristles can rest on the convex side surfaces 18 of the driving arms 4 facing them with an adapted curvature, as well as on the convex radial outer side 11 while working, so that no damage or breakage of the bristles is to be feared.
• the bristles can rest on the convex side faces of the driving arms 4 with an adapted curvature facing them, as well as on the convex radial outer side 11 while working, so that no damage or breakage of the bristles is to be feared.
• this task can also be carried out by such a positive driving construction between the drive hub N and the
• the tool for example as a safety rotary brush, for example for surface processing, is equipped with the following features:
• a one-piece or multi-part flexible tool band 36, for example brush band 31, with a flat cross section is provided, which can be designed as a closed ring, for example a brush ring.
• Bristle bodies 32 are then attached to the brush band 31 as a brush ring, the bristle bodies 32 are U-shaped, their free legs at least partially penetrating radially outward through the brush band 31 and their free ends predominantly projecting radially outward from the brush band 31.
• the brush band 31 remains unstressed and maintains a noticeable radial flexibility even when working, which allows a noticeable radially inward and outward elastic mobility of the brush band 31 during operation.
• driving elements 33 for positively engaging a driving clutch for driving the brush belt 31 can be arranged.
• the arrangement of the driving elements 33 within the brush ring creates considerable advantages.
• the form-fitting drive connection reliably prevents slippage, ie twisting of the brush ring relative to the driver coupling, and saves any clamping device and the clamping process.
• the bristles or bristle groups ⁇ U can be largely unimpeded radially inward through the brush band during operation by overcoming the centrifugal force acting on the bristles by the workers acting on the bristles can be inserted if no internal support is provided, which may be desirable in some applications, for example if a strongly profiled surface has to be machined, so that immersion of the bristles is promoted.
• the design of the driver elements 33 as loops 34 also has the particular advantage that in the event of a malfunction the rotary brush continues to be positively coupled to the driver's drive shaft.
• an additional ring body 35 is arranged in the brush ring 36, through which the loops 34 can also be formed.
• This ring body 35 prevents the bristles from being pushed in from the brush ring in the direction of the brush center axis.
• the brush flexibility ie its flexibility towards the central axis and the elasticity of the bristles and bristle groups in their angular position to the circumferential tangent, can be adjusted by determining the thickness and material composition of the brush ring 35 and the ring body.
• the ring body 35 which is firmly connected to the brush band (vulcanized, glued, sewn) and which can be adjusted in its elasticity or flexibility, brings about a resilient, elastic mode of operation of the bristles without these being irreversibly pushed out of the brush band 31 radially into the interior of the brush ring .
• the resetting property (flexibility of the brush band 31 in the radial direction, that is to say and away from the center axis of the brush) of the bristles 32 and bristle groups by a soft-elastic elastomer 31 firmly anchored in the brush ring 36, for example by introducing Foam rubber or the like, can be raised in the hollow brush ring 36.
• the loops or corresponding loop-like, coaxial to the axes of the driving arms can be used for positive engagement of a driving clutch in the brush hub Acceptances 38 are omitted.
• FIG. 5 shows the top view of a safety rotary brush according to the invention with various possible entrainment elements inside a free inside of the brush ring 36
• FIG. 5 shows the top view of a safety rotary brush according to the invention with various possible entrainment elements inside a free inside of the brush ring 36
• FIG 6 shows a safety rotary brush with a fixedly connected ring body 35 and loops 34 arranged in different ways
• FIG 1 shows a safety rotary brush according to the invention with or without a firmly connected ring body but in each case with a resiliently soft inner filling 31 of the brush ring 36, in which only recesses 38 for the driving clutch are arranged.
• FIG. 8 shows a sectional drawing of the rotary brush in accordance with the embodiments according to FIG. 5 or FIG. 6 or FIG. 1.
• FIG. 5 shows various exemplary embodiments of a safety rotary brush according to the invention, in which U-shaped bristles 32 through the brush band 31 are inserted.
• the brush band 31 is locked into a ring, the free bristle ends projecting radially outwards.
• Loop-shaped driver elements 33 are attached in the interior of the brush ring 36 and can simultaneously connect several brush band segments to form a ring.
• the drivers for example driver arms 4, of a drive coupling are pushed into the driver elements 33, thus forming the brush belt mounting and holder while maintaining a radially flexible, noticeable brush belt mobility, and at the same time thus enable the form-fitting brush belt drive.
• Detail A in FIG. 5 shows a loop-shaped driver 33 fastened on the inside in the brush band 31, detail B in FIG. 5 the foot of a loop-shaped driver 33, which simultaneously connects brush band segments, detail C in FIG. 5 shows such a driver 33 with the loop shaped head piece, the loop 34.
• Detail D in Fig. 5 shows a Mitneh ⁇ mer loop 34, which is formed by gluing, vulcanizing, sewing or clipping from the brush band 31 itself.
• FIG. 5 shows a Mitneh ⁇ mer loop 34, which is formed by gluing, vulcanizing, sewing or clipping from the brush band 31 itself.
• the safety rotary brush is provided on the inside with an elastic, flexible, firmly connected ring body 35, the drivers 33 being designed in detail A, B, C and D in a manner similar to that in FIG. 5.
• Detail E of 6 shows a driver loop 34 formed from the ring body 35.
• a safety rotary brush according to the invention with a firmly connected ring body 36 and with a flexible, resilient inner filling 31 is shown in FIG. 1.
• the inner filling 31 can and is made of foam rubber or the like internally connected to the brush band 31 or the ring body 35.
• loop-like recesses 38 can be seen, in which the drive clutch can engage.
• FIG. 8 shows a section through a safety rotary brush of the type described above.
• the U-shaped bristles are pushed as far as possible through the brush band 31 and are supported by the flexible ring body 35 which is firmly connected to the brush band 31.
• a driver coupling provided with a drive flange 7 for motors is through the driver loops
• driver elements 74 formed here, for example, as driver loops 34 can, according to the invention, also be designed differently for the form-fitting connection with the driver arms 4 or axial projections A.
• An essential further part of the rotary tool according to the invention is, in particular even when using lower speeds, the possible arrangement of a radially elastically expandable ground ring acting under centrifugal force within the tool sleeve H, in order to enable this sleeve, particularly at lower speeds, advantageously to provide a speed-dependent inner support, in order to achieve particularly high speeds To enable work performance and work pressure also in the radial direction.
• a ground ring is indicated by dashed lines in FIG. 5, but only in a segment section.
• the actual earth ring 50 can consist of the mass ring elements 50 exposed to the centrifugal force, which can be guided in a radially movable manner, for example by means of radial guide shafts 52, in a closed retaining ring 51 and, for example, by means of springs 54, which are located on the retaining ring 51 and on the mass ring elements 50 and / or can be supported on the guide shafts 52 via stops 55, can be radialphaseasiei, while the mass ring elements 50 then the brush belt 31 can be preselected depending on the speed and at the same time radially elastically flexible.
• This exemplary embodiment of the earth ring can also consist of slotted earth ring sleeves made of resilient elastic material, which in the idle state cannot be radially expanded, for example, can rest only slightly on the inner circumference of the brush band 31, or can also consist, for example, of a earth ring layer in the form of ring segments, for example made of metal or elastomer, etc., which, for example, is not or only slightly at
• Inner diameter of the brush band 31 abut and are firmly connected to the outer peripheral surface of a resilient-elastic soft rubber filling carried radially inside the brush band.
• the outer diameter of the mass ring according to the invention wanting to increase elastically depending on the speed under the centrifugal force acting on it and consequently radially outwards depending on the speed from the inside onto the brush ring and / or acts on the bristle roots, the resiliently elastic ground ring having a smaller diameter in the idle state and in operation preferably resting against the brush band 31, at least over part of the circumference.
• the resiliently expandable mass ring R to be arranged in the tool sleeve H, optionally freely in the tool sleeve H, radially inside the tool sleeve H, can for example predominantly be a resilient elastic elastomer and / or metal.
• This mass ring which is preferably used at lower speeds and high manpower, is radially elastically expandable under the centrifugal forces that become effective in it, for example depending on the speed, and is connected to the radially inner circumferential surface of the tool sleeve H in such a way that the mass ring R rotates radially outwards depending on the speed can be supported on the inner circumferential surface of the tool sleeve H, for example on the inside of the brush band with the bristle roots.
• the rotary tool according to the invention consisting of drive hub N and exchangeable tool sleeve H, is provided, inter alia, with additionally designed flow guide surfaces arranged on drive hub N and / or on tool sleeve H.
• These additionally provided flow guide surfaces bring about a cooling effect on the rotary tool when the rotary tool is working by causing an additional flow of the medium surrounding the rotary tool, for example the air, on the rotary tool and the flow guide surfaces being in the form of a turbine or a compressor and / or one Vane or paddle wheel can be formed.
• the additional flow of the surrounding medium that can be generated takes place predominantly axially through the radial interior of the tool sleeve H and / or over the outer surface of the rotary tool
• the flow or turbine-like flow guide surfaces for example, predominantly axially on one of the flanges 1 or 2 of the drive hub N or on both are arranged on the end face facing away from the other flange 2 or 1 or predominantly radially inside the tool sleeve H in the drive hub N.
• Such cooling for example as internal cooling, is indicated schematically in FIG. 8, for example, by openings 47 in one flange wall located radially further inward, which at the same time can carry blade ribs 43 axially on the outside, which, when the brush tool is rotated, create a dynamic pressure of the ambient air into opening 47 generate and thereby direct an air flow into the interior of the rotary tool according to the indicated flow arrows, whereby in the other flange wall, for example, openings 42 located radially further outward can be arranged, through which the air flow can escape from the inside of the rotary tool again to the outside, at the Openings 42 additionally arranged blade ribs can be provided, which here generate a negative pressure at the openings 42 when the rotary tool is rotated, so that, according to the drawn flow arrows, the air flow leaves the tool again in a strongly flowing manner.
• Numerous openings 47 and 42 of this type are possible, as are other designs and designs of the flow surfaces on the inside and outside of the rotary tool, for example on the
• the flow guide surfaces can work, for example, in the manner of a compressor or a turbine and / or an impeller or a paddle wheel, or they can preferably also use the inertial forces of the flow medium, for example by using the centrifugal force and, instead or in connection therewith / or the inertia acting on the fluid when the tool is rotating.
• appropriately arranged openings on different radii from the axis of rotation would be expedient, for example in connection with a shovel-shaped surface contour, for example on the flanges 7 and / or 2.
• the rotary tool self-cooling according to the invention and the speed-dependent mass ring tool sleeve inner support according to the invention are only indicated schematically in the drawing, specifically in FIGS. 5 and 8 and not separately in a separate figure. However, they are not only limited to the exemplary embodiments mentioned.
• the individual embodiments contributing to higher effectiveness, performance, safety, etc. compared to the prior art are each individually suitable for bringing about improvements over the known and avoiding its specific disadvantages, but they can also be used in any combination with one another or are used and trained with one another in order to ensure that the tool is optimally adapted to the practical requirements of the application in each case and, in any case, work better than the comparable prior art and at least partially, but preferably completely, its respective disadvantages avoid, the invention is not intended to be limited to the exemplary embodiments shown in each case, but rather all alternative and equivalent means should also be part of the invention.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Brushes (AREA)

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Citations (5)

• 1991
  • 1991-10-19 HU HU922369A patent/HUT62506A/hu unknown
  • 1991-10-19 EP EP19910918260 patent/EP0510133A1/de not_active Withdrawn
  • 1991-10-19 WO PCT/EP1991/001992 patent/WO1992006821A1/de not_active Application Discontinuation
  • 1991-10-19 AU AU87331/91A patent/AU8733191A/en not_active Abandoned
  • 1991-10-19 CA CA 2076344 patent/CA2076344A1/en not_active Abandoned
• 1992
  • 1992-06-30 FI FI923043A patent/FI923043A/fi not_active Application Discontinuation

Patent Citations (5)

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