DK171703B1

DK171703B1 - Rotary grinding or polishing tool with replaceable grinding elements

Info

Publication number: DK171703B1
Application number: DK84992A
Authority: DK
Inventors: Poul Erik Jespersen
Original assignee: Poul Erik Jespersen
Priority date: 1992-06-29
Filing date: 1992-06-29
Publication date: 1997-04-01
Also published as: DK84992A; DK84992D0

Description

i DK 171703 B1in DK 171703 B1

Opfindelse angår et roterende slibe- eller pudseværktøj med udskiftelige slibeelementer, som under virkning af centrifugalkraften under værktøjets rotation og i kombination med slibeelementemes egenstivhed og elastiske bøjelighed er beregnet til eftergiveligt at overstryge og bearbejde den overflade, som er under behandling, og hvor de bø-5 jelige slibeelementer i det væsentlige udgøres af lameller af slibelærred (smergellærred, sandpapir etc.), og fortrinsvis også af afstivende børster indsat mellem disse lameller, og hvilket slibe- eller pudseværktøj nærmere bestemt er af den art, hvor slibe-elementerne er monteret på ydersiden af et rotationssymmetrisk værktøjskorpus, som er sammensat af et aksialt gennemgående midterstykke og et antal cylinder skalstyk-10 ker, som på komplementær vis omslutter midterstykket og er aftageligt fastgjort på dette, hvor der på ydersiden af skalstykkeme, for eksempel ved spåntagende bearbejdning, er indarbejdet enkelt eller flergængede, skruelinieformede indfæstningsnoter beregnet til optagelse af slibeelementeme fortrinsvis ved en udskiftelig indfæstning af disse ved hjælp af fodstykker på elementerne, som er indskydelige i noterne.BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a rotary grinding or polishing tool having interchangeable abrasive elements which, by virtue of the centrifugal force during the rotation of the tool, and in combination with the abrasive element's elasticity and elastic flexibility, are intended to resiliently coat and work the surface under treatment and where they are applied. 5 abrasive grinding elements are essentially constituted of grinding sheets (grinding cloth, sandpaper, etc.), and preferably also of stiffening brushes inserted between these slats, and which grinding or cleaning tool is more specifically the kind in which the grinding elements are mounted on the exterior of a rotationally symmetrical tool corpus, which is composed of an axially extending center piece and a plurality of cylinder shell pieces, which complementarily surround the center piece and are removably attached thereto, where, on the outside of the shell pieces, for example, by machining incorporated single or multiple hinged, helical fastening notes intended for receiving the abrasive elements preferably by a replaceable mounting thereof by means of footings on the elements slidable in the grooves.

1515

Slibe- eller pudseværktøjer er den her omhandlede art anvendes som hovedregel til slibning og pudsning af ikke plane overflader, så som krumme møbeldele, fyldningslåger, fyldningsdøre, etc. Sædvanligvis består det slibeaktive materiale af smergellærred, der er opklippet i bændler eller lameller, og den slibende eller pudsende effekt op-20 står som følge af lamellernes samlede massevirkning under deres eftergivelige overstrygning af emnet under værktøjets rotation, hvorunder centrifugalkraften bidrager til det for bearbejdningen nødvendige slibetryk. I andre sammenhænge benyttes lignende værktøjer for eksempel til polering af overflader og til fj emel se af overfladebelægninger. I sådanne tilfælde kan de slibeaktive elementer bestå af læderstrimler, 25 stive børster eller lignende arbejdsorganer, som har en pudsende eller polerende effekt i sig selv.Abrasive or abrasive tools are the type of abrasive used herein, as a general rule, for grinding and polishing non-planar surfaces, such as curved furniture parts, filling doors, filling doors, etc. Usually, the abrasive-active material consists of paints canvas cut into tapes or slats, and the abrasive or abrasive effect arises as a result of the total mass action of the slats during their resilient overstretching of the workpiece during the rotation of the tool, under which the centrifugal force contributes to the abrasive pressure required for machining. In other contexts, similar tools are used, for example, for polishing surfaces and for removing surface coatings. In such cases, the abrasive elements may consist of leather strips, 25 rigid brushes or similar work organs which have a polishing or polishing effect in themselves.

Et kendt værktøj af den her omhandlede type benævnes ’’flatterpudser”. Værktøjet er blandt andet omtalt i dansk fremlæggelsesskrift nr. 149.281 B. Værktøjet er sammen-30 sat af et antal paralleltliggende, cirkelformede pudserondeller, der hver især er opslidset i radiære lameller ved gennemskæring radiært fra periferien og et stykke ind mod centrum af rondellen. Sliberondelleme er opspændt på en gennemgående, central 2 DK 171703 B1 værktøjsaksel. Når der er tale om pudseværktøjer af en vis bredde, eksempelvis af den type, der benyttes til efterslibning og pudsning af fyldningslåger og fyldningsdøre, er værktøjsakslen lejret i begge ender. Sliberondelleme har en relativ kort levetid og skal følgelig udskiftes med jævne mellemrum. Udskiftningen forudsætter, at værktøjet som 5 helhed demonteres, hvilket indebærer, at lejer og drivanordning (kobling, remskive, kædehjul, etc.) skal adskilles. Først når den centrale aksel er fri, kan de slidte rondeller fjernes og nye indsættes på akslen. Processen er omstændelig, arbejdskrævende og bevirker tab af kostbar produktionstid. Andre ulemper ved det kendte “flatterpudser” system er omtalt i beskrivelsen til dansk patentansøgning nr. 0191/91.A known tool of the type in question is referred to as '' flatter brushes ''. Among other things, the tool is disclosed in Danish Patent Specification No. 149,281 B. The tool is composed of a number of parallel, circular plaster rounds, each slotted into radial slats by cutting radially from the periphery and a distance towards the center of the roundabout. The sliver parts are clamped on a continuous, central 2 tool 171703 B1 tool shaft. In the case of cleaning tools of a certain width, for example of the type used for grinding and polishing of filling doors and filling doors, the tool shaft is mounted at both ends. The sliver parts have a relatively short life and must therefore be replaced periodically. The replacement assumes that the tool as a whole is dismantled, which means that the bearings and drive device (clutch, pulley, sprocket, etc.) must be separated. Only when the central shaft is clear can the worn pulleys be removed and new ones inserted on the shaft. The process is cumbersome, labor intensive and causes a loss of costly production time. Other disadvantages of the known "flatter" system are discussed in the description of Danish patent application no. 0191/91.

1010

Til grund for opfindelsen ligger den opgave at anvise et slibe- eller pudseværktøj af den angivne art, som ikke er behæftet med de ovenfor anførte ulemper i forbindelse med udskiftningen af de slidte slibeelementer, og som samtidig udmærker sig ved at have større slibeeffektivitet, ved at medføre bedre slibefinish, og ved at have en bedre 15 slibeøkonomi sammenlignet med de hidtil kendte værktøjer af tilsvarende type. Dette opnås ifølge opfindelsen ved at opbygge og indrettet værktøjet efter de principper, der er angivet i den kendetegnende del af krav 1.The object of the invention is to provide a grinding or cleaning tool of the specified kind, which is not subject to the disadvantages mentioned above in connection with the replacement of the worn abrasive elements, and which at the same time distinguishes itself by having greater abrasive efficiency, by result in a better grinding finish, and by having a better 15 grinding economy compared to the previously known tools of similar type. This is achieved according to the invention by constructing and arranging the tool according to the principles set forth in the characterizing part of claim 1.

Det roterende pudseværktøj ifølge opfindelsen er ejendommeligt ved, at hvert skal-20 stykke for sig er frembragt (i det mindste ud fra en geometrisk betragtning) som en på langs i to eller flere halvdele/segmentstykker gennemskåret cylinderskal, hvorhos gængerne i hvert andet skalstykke er højregående, og gængerne i hvert andet skalstykke er venstregående, således at de to (eller flere) skaller i monteret stilling på værktøjet fremtræder med gænger (indfæstningsnoter), der er indbyrdes brudt og/eller forsat. På 25 ydersiden af skalstykkeme findes et antal T-noter eller svalehalenoter, hvori slibeele-menteme er indfæstet. Andre indfæstningsprincipper er også mulige.The rotary plaster tool according to the invention is characterized in that each shell 20 is produced separately (at least from a geometric view) as a cylindrical shell cut longitudinally into two or more halves / segment pieces, the threads of each other shell piece being and the threads of each other shell piece are left-handed, so that the two (or more) shells in the mounted position on the tool appear with threads (fastening notes) that are mutually broken and / or set. On the outside of the shell pieces are a plurality of T-notes or dovetail notes into which the abrasive elements are attached. Other mounting principles are also possible.

Den indbyrdes skråstilling af slibelamelleme som følge af de skiftevis højre- og venstregående gænger over de to halvdele af værktøjskorpus har til formål at sikre, at be-30 arbejdningen foregår ved en art krydsslibning af overfladen, hvor slibesporene hele tiden krydser over og “jævner” over hinanden. Herved opnår man en særlig effektiv og 3 DK 171703 B1 ensartet slibning selv i tilfælde, hvor der arbejdes med detaljerede og komplicerede emnegeometrier.The intersection of the grinding blades as a result of the alternating right and left threads over the two halves of the tool corpus is intended to ensure that the work is done by a kind of cross-grinding of the surface, where the grinding grooves constantly cross and "smooth" over each other. This results in a particularly efficient and even sanding even in cases where detailed and complicated workpiece geometries are used.

Konstruktionsprincippet med aftagelige skalstykker gør det muligt at udskifte slidte 5 slibeelementer uden demontage af værktøjets bærende midterstykke, det vil sige at lejring og drivanordning kan forblive intakt. Skalstykkeme med tilhørende slibeelementer kan være beregnet til udskiftning som præfabrikerede, montageklare enheder, eller systemet kan alternativt være indrettet på en sådan måde, at alene slibeelementerne udskiftes som enheder for sig, det vil sige at selve skalstykkeme genbruges. Slibe-10 elementerne kan udskiftes på skalstykkeme uden brug af værktøj og på en meget hurtig og arbejdsmæssige enkel måde, når først skalstykkeme er demonteret fra korpus-midterstykket.The design principle with removable shell pieces makes it possible to replace worn 5 abrasive elements without dismantling the tool's supporting center piece, that is, the bearing and drive device can remain intact. The shell pieces with associated abrasive elements may be intended for replacement as prefabricated, assembly-ready units, or the system may alternatively be arranged in such a way that only the abrasive elements are replaced as units individually, that is, the shell pieces themselves are recycled. The abrasive-10 elements can be replaced on the shell pieces without the use of tools and in a very quick and workable simple manner once the shell pieces are removed from the corpus center piece.

Hvert skalstykke for sig er frembragt som en på langs gennemskåret cylinderskal, og 15 samtidig er gængerne i det ene skalstykke højregående, og gængerne i det andet skalstykke er venstregående, således at de to skaller i monteret stilling på korpusmidter-stykket fremtræder med gænger (noter), der er indbyrdes brudt og/eller forsat. Herved opnås på enkel måde den ovenfor omtalte krydsslibning.Each shell piece is produced separately as a longitudinal sectioned cylinder shell, and at the same time the threads in one shell piece are upright and the threads in the other shell piece are left-hand so that the two shells in mounted position on the corpus center piece appear with threads (notes ) that are broken and / or set apart. In this way, the above-mentioned cross-grinding is obtained in a simple manner.

20 Formålstjenligt er slibeelementeme præfabrikeret i halvcirkelformede segmentstykker, som hver består af en fodprofil, hvori slibelamelleme og de eventuelle børster er indfæstet. Disse segmentstykker er enkeltvis indskydelige i de nævnte gængeafsnit i skalstykkeme, når disse er adskilt fra hinanden, underforstået: når i det mindste det ene skalstykke er fjernet fra korpus-midterstykket, således at gængeafsnittene er åbne i 25 enderne.Conveniently, the grinding elements are prefabricated in semi-circular segment pieces, each of which consists of a foot profile into which the grinding elements and the optional brushes are fixed. These segment pieces are individually slidable in said thread sections of the shell pieces, when separated from each other, by implication: when at least one shell piece is removed from the corpus center piece so that the thread sections are open at the ends.

Ved udskiftning af slidte slibeelementer er det tilstrækkeligt at demontere det ene skalstykke, hvorefter segmentstykkeme frist kan trækkes ud fra noterne i begge skalstykker og nye indskydes. Det er altså unødvendigt at demontere værktøjet som helhed 30 fra maskinen, det vil sige at man undgår at skulle konstruere specielle leje- og drivarrangementer på denne.When replacing worn abrasive elements, it is sufficient to disassemble one shell piece, after which the segment pieces can be pulled out from the notes in both shell pieces and new ones can be inserted. Thus, it is unnecessary to disassemble the tool as a whole 30 from the machine, that is, avoid having to construct special bearing and drive arrangements on it.

4 DK 171703 B14 DK 171703 B1

De præfabrikerede slibeelementer jvf. krav 2 og 3 er velegnede til fremstilling ved moderne, rationelle fabrikationsmetoder (sprøjtestøbning af termoplastisk formstof, oppresning af metalplade, etc.), det vil sige at elementerne kan fremstilles til en relativ lav stykpris. Elementerne er hurtige at skifte og indebærer endvidere den fordel, at 5 slibelamelleme allerede under fremstillingsprocessen kan bringes til at vende med slibesiden korrekt fremefter. Derved undgår man, at skulle indkøre slibeelementeme efter udskiftning af disse. Slibeelementeme er parate til produktionskørsel straks fra starten af.The prefabricated abrasive elements according to claims 2 and 3 are suitable for manufacture by modern, rational fabrication methods (injection molding of thermoplastic resin, metal sheet erection, etc.), ie the elements can be manufactured at a relatively low unit price. The elements are quick to change and furthermore have the advantage that even during the manufacturing process the abrasive blades can be made to turn with the abrasive side correctly forward. This avoids having to insert the grinding elements after replacing them. The grinding elements are ready for production run right from the start.

10 Opfindelsen skal forklares nærmere i forbindelse med tegningen, hvor fig. 1 viser et værktøjskorpus til et slibeværktøj ifølge opfindelsen, set skråt fra siden, fig. 2 samme set i retning ind mod den ene endeflade, 15 fig. 3 et snit langs linien A-A i fig. 2, fig. 4 et fra værktøjets korpus-midterstykke demonteret skalstykke, vist særskilt, fig. 5 et halvcirkelformet segmentstykke (slibeelement) beregnet til indsættelse i det i fig. 1 viste værktøjskorpus, set skråt fra siden, fig. 6 samme i tværsnit, 20 fig. 6a samme i en udførelsesform med støbt fodstykke, fig. 7 et eksempel på en fastspændingsanordning for det aftagelige skalstykke, vist i tværsnit, fig. 8 skalstykket vist særskilt, set skråt fra siden, fig. 9 en detalje fra selve låsemekanismen i sidebillede, og 25 fig. 10 samme i snit langs linien B-B i fig. 9.The invention will be explained in more detail in connection with the drawing, in which fig. 1 is a side view of a tool corpus for a grinding tool according to the invention; FIG. 2 shows the same in the direction towards one end surface; FIG. 3 is a section along the line A-A of FIG. 2, FIG. 4 shows a shell piece disassembled from the tool body centerpiece, shown separately; FIG. 5 shows a semi-circular segmental piece (abrasive element) intended for insertion into the FIG. 1 is a side view of the tool corpus, FIG. 6 is a cross sectional view, FIG. 6a the same in a molded foot embodiment; 7 shows an example of a clamping device for the removable shell piece, shown in cross section; FIG. 8 is a separate side view of the shell, FIG. 9 is a side view of the locking mechanism itself, and FIG. 10 is a sectional view taken along line B-B of FIG. 9th

I den på tegningens fig. 1 - 4 viste udførelsesform består slibeværktøjet i det væsentlige af et rotationssymmetrisk værktøjs-korpus 1, der har form som en aflang cylinder 2 med en akseltap 3 stikkende ud i hver ende. Værktøjskorpus 1 er sammensat af et 30 centralt midterstykke 4, hvor af de to akseltappe 3 udgør en integreret del. Midterstykket har form som en kraftig aksel eller cylinder. Rotationsaksen er angivet med C. Udvendig omkring midterstykket 4 er monteret to skalstykker 5 og 6. Disse har form 5 DK 171703 B1 som to på langs gennemskåme cylinderskaller. Skalstykkeme, eller i det mindste det ene af disse, er fastspændt på midterstykket ved hjælp af skruer 7. Det andet skalstykke kan være aftageligt fastgjort ved hjælp af en eller anden form for snaplåsemekanisme, mere herom senere. Alternativt kan også det andet skalstykke være fast-5 spændt på midterstykket 4 ved hjælp af skruer.In the FIG. 1 to 4, the grinding tool consists essentially of a rotationally symmetrical tool body 1 which is shaped like an elongated cylinder 2 with a shaft 3 protruding at each end. Tool body 1 is composed of a central center piece 4, of which the two shaft pins 3 form an integral part. The centerpiece has the shape of a powerful shaft or cylinder. The axis of rotation is indicated by C. On the outside around the center piece 4 are mounted two shell pieces 5 and 6. These have the shape 5 DK 171703 B1 as two longitudinally cut cylindrical shells. The shell pieces, or at least one of them, are clamped to the center piece by screws 7. The other shell piece may be removably secured by some kind of snap-locking mechanism, more on this later. Alternatively, the second shell piece may also be clamped to the center piece 4 by means of screws.

De to skalstykker 5 og 6 er hver for sig forsynet med et antal nærmest paralleltløbende noter 8 på den udvendige side. Disse noter er frembragt som gevindgænger i de cylinderskaller, hvoraf skalstykker - i det mindste i geometrisk forstand - udgør en halvdel 10 hver for sig. Gængerne (det vil sige noterne 8) er højregående på det ene skalstykke 5 og venstregående på det andet skalstykke 6. Noterne 8, som kan være frembragt ved fræsning eller drejning, har T-profil, og er beregnet til at optage slibeelementeme.The two shell pieces 5 and 6 are individually provided with a plurality of almost parallel grooves 8 on the outside. These notes are produced as threads in the cylindrical shells, of which shell pieces - at least in the geometric sense - constitute one half 10 each. The threads (i.e., the grooves 8) are right-handed on one shell piece 5 and left-hand on the other shell-piece 6. The grooves 8, which may be produced by milling or turning, have a T-profile and are intended to accommodate the abrasive elements.

Slibeelementeme er samlet i segmentstykker 9, som er beregnet til indskydning i no-15 terne 8 efter demontage af det ene skalstykke 5,6. Ved denne demontage vil samtlige noter 8 i de to skalstykker være frit tilgængelige fra enderne af, således at segment-stykkerne 9 med fodstykket 10 uden videre kan skydes på langs ind i noterne. Seg-mentstykkeme er både i form og størrelse tilpasset noterne, således at indføringen kan foregå uden tilpasning og uden brug af værktøj.The abrasive elements are assembled into segment pieces 9 which are intended for insertion into the grooves 8 after dismantling of the one shell piece 5.6. In this disassembly, all of the grooves 8 of the two shell pieces will be freely accessible from the ends, so that the segment pieces 9 with the footer 10 can be slid into the grooves without delay. The segment pieces are both in shape and size adapted to the notes, so that the insertion can be carried out without adjustment and without the use of tools.

2020

Hvert segmentstykke 9 (fig. 5 og 6) består af et antal slibelameller 11, eksempelvis af smergellærred, som er indfæstet i fodstykket 10 sammen med støttebørster 12. Både børster og slibelameller er sikret ved hjælp af en ankertråd 13, som er indlagt i fodstykket og omkring hvilken børsterne og lamellerne er ført. Selve fodstykket 10 udgø-25 res af en U-formet metalprofil 14, hvis to sideflanger 15 og 16 er klemt sammen omkring børster og lameller mv. Samtidig er fodstykket bukket op i en til den respektive gevindgænge (not 8) tilpasset “snoet” form, med lamellerne 11 og børsterne 12 strittende radiært udad. Slibelamelleme 11 kan på i og for sig kendt måde være frembragt ved passende opslidsning af et slibeark, således at lamellerne er sammenhængende 30 langs en “rygside”. Rygsiden udgør da slibelamellemes indfæstningsdel, det vil sige den i fodstykket værende del af slibearket.Each segment piece 9 (Figs. 5 and 6) consists of a plurality of abrasive lamellae 11, for example, of embroidery canvas, which is attached to the footpiece 10 together with support bristles 12. Both brushes and abrasive lamellae are secured by an anchor wire 13 which is inserted into the base and around which the brushes and slats are guided. The base 10 itself is constituted by a U-shaped metal profile 14, whose two side flanges 15 and 16 are clamped around brushes and slats, etc. At the same time, the footpiece is bent into a "twisted" shape adapted to the respective thread thread (Note 8), with the slats 11 and the brushes 12 radially protruding outwards. The abrasive lamellae 11 may be produced in a manner known per se by appropriate slitting of a abrasive sheet so that the lamellae are continuous 30 along a "back side". The back side then forms the attachment part of the abrasive, that is, the part of the abrasive sheet which is in the foot piece.

6 DK 171703 B1 I fig. 6a er segmentstykket vist i en udførelsesform, hvor slibelamelleme og børsterne er indstøbt i et fodstykke 17 af termoplastisk formstof. Ud over det ændrede materialevalg adskiller segmentstykket sig ikke fra den allerede beskrevne. Fodstykket af plast udmærker sig ved at være let bøjeligt, således at segmentstykket kan fremstilles 5 (støbes) i plan form. Først under monteringen i værktøjets gængeformede not 8 “vrides” fodstykket på plads i den respektive gængeform.6 DK 171703 B1 In fig. 6a, the segment piece is shown in an embodiment in which the abrasive blades and the brushes are embedded in a thermoplastic resin foot 17. In addition to the changed material selection, the segment does not differ from the one already described. The plastic foot piece is distinguished by being easily flexible, so that the segment piece can be made 5 (cast) in planar form. Only during installation in the tool threaded groove 8 does the footpiece “rotate” in place in the respective thread shape.

I fig. 7 - 10 er vist en mekanisme, hvormed det aftagelige skalstykke 5 er fastgjort til værktøjs-midterstykket 4. Det andet skalstykke 5 er på sædvanlig måde fastgjort ved 10 hjælp af skruer (ikke vist), og er ikke beregnet til demontering under skift af slibelameller. Mekanismen består af en på langs forskydelig låsepal 18, der er lejret i to udfræsede styrespor 19 i midterstykket 4. Styresporene forløber parallelt med rotationsaksen C. Låsepalen 18 har form som en aflang skinne med samme længde som midterstykket. I denne skinne er udfræset et antal nøglehuls-formede udsparinger 20 Αεί 5 regnet til at optage et tilsvarende antal, radiært indadrettede låsetappe 21 monteret på indersiden af skalstykket 5, se fig. 8. Låsetappene 21 er hver især forsynet med en inddrejning 22, som er tilpasset den smalle del af nøglehuls-udfræsningen 20, således at et låsegreb mellem palen 18 og låsetappene kan etableres ved passende forskydning af palen.In FIG. Figures 7 - 10 show a mechanism by which the removable shell piece 5 is attached to the tool center piece 4. The second shell piece 5 is fixed in the usual manner by means of screws (not shown) and is not intended for dismantling during the change of abrasive blades. . The mechanism consists of a longitudinally displaceable locking pawl 18 which is mounted in two milled guide grooves 19 in the middle piece 4. The guide grooves extend parallel to the axis of rotation C. The locking pawl 18 has the shape of an elongated rail with the same length as the middle piece. In this rail, a number of keyhole-shaped recesses 20 Αεί 5 are milled to accommodate a corresponding number of radially inward locking pins 21 mounted on the inside of the shell piece 5, see fig. 8. The locking pins 21 are each provided with a recess 22 adapted to the narrow portion of the keyhole cutter 20 so that a locking grip between the pawl 18 and the locking pins can be established by appropriate displacement of the pawl.

2020

Under normal drift holdes låsepalen i den låste stilling af en fleder 23 indsat mellem palen og midterstykket. Mekanismen kan åbnes manuelt ved forskydning af palen 18 mod flederens virkning indtil tappene 21 befinder sig ud for nøglehuls-udsparingernes 20 brede afsnit. I denne stilling kan skalstykket frit aftages. Forskydningen af låsepa-25 len sker ved påvirkning af en dertil indrettet gribehage 24, der er tilgængelig udefra i den ene ende af værktøj s-midterstykket 4.During normal operation, the locking pawl is held in the locked position by a flutter 23 inserted between the pawl and the center piece. The mechanism can be opened manually by displacing the pawl 18 against the action of the flats until the pins 21 are off the wide portions of the keyhole recesses 20. In this position, the shell piece is freely removable. The locking panel 25 is displaced by actuation of a gripping hook 24 adapted therefrom, accessible from the outside at one end of the tool center piece 4.

Claims

7 DK 171703 B1

1. Rotary grinding or polishing tool with interchangeable grinding elements, which, under the action of the centrifugal force during the rotation of the tool and in combination with the self-stiffness and elastic flexibility of the grinding elements, are intended to resiliently coat and process the surface being treated and where flexible abrasive elements are essentially constituted by slats (11) of abrasive canvas (paints, sandpaper, etc.), and preferably also of stiffening brushes (12) inserted between these slats, and which grinding or cleaning tool is more specifically of the kind in which sliding The -10 leg members are mounted on the outside of a rotationally symmetrical tool corpus (1), which is composed of an axially extending center piece (4) and a plurality of cylinder shell pieces (5,6), which complementarily surround the center piece (4) and are removably fixed on this, where, on the outside of the shell pieces, for example by machining, a simple e Or multi-threaded, helical fastening grooves (8) intended to receive the abrasive elements, preferably by a replaceable fastening thereof by footpieces (10) on the elements slidable in the grooves, characterized in that each shell piece (5,6) is produced separately (at least from a geometrical point of view) as a longitudinal sectional cylinder shell, cut into two or more halves / segment pieces, the threads of each other shell piece being upright and the threads of each other shell piece being left , so that the two (or more) shells in the mounted position on the tool appear with threads (fastening notes) that are mutually broken and / or offset.

Rotary grinding or polishing tool according to claim 1, wherein the number of shell pieces (5,6) 25 are two, each covering 180 ° of the circumference, characterized in that the grinding elements (9) are prefabricated in almost semicircular segment pieces, each consisting of of a foot profile (10) in which the abrasive members (11) and the optional brushes (12) are anchored, which segment pieces (9) are slidable in said fastening notes (8) in the shell pieces (5,6) when separated from each other , understood: when at least 30 one shell piece is removed from the tool. 8 DK 171703 B1

Rotary grinding or polishing tool according to claims 1 and 2, wherein the fastening grooves have a dovetail profile or a T-profile, characterized in that the footpieces (10) of the segment pieces have a complementary cross-sectional shape formed on the basis of a metallic U-shape. profile (14), the side flanges (15,16) of which are clamped about 5 abrasive blades (11) and / or the brushes (12), the slats and brushes being guided around a steel wire or synthetic fiber wire (13) inserted into the bottom of the The U-profile to lock the abrasive lamellae and the brushes at which the clamping of the U-profile is shaped according to the cross-section of the fastening notes.

Rotary grinding or polishing tool according to claims 1 and 2, characterized in that the segment pieces (9) are formed by embedding the abrasive blades and brushes in a thermoplastic resin or similar moldable plastic material and that the footpiece is shaped according to the cross-section of the fastening grooves.

Rotary grinding or cleaning tool according to claims 1 and 2, characterized in that only one shell piece (6) is detachable from the tool, while the other shell piece is fixedly clamped on the tool's middle piece (4), if necessary. designed as an integral part of the center piece.