DE102013009129B4 - Improved Abrasive Device - Google Patents

Abstract

An improved abrasive device for applying a rotating abrasive surface, comprising an upper hub wheel 10 and a lower hub wheel which are nested, the upper hub wheel 10 and the lower hub wheel being connected by threads and said threads are formed on the steep, mating sides 11 of the hubs, providing reduced wear and improved operability. Advantageously, a socket sleeve 13 reduces the risk of entanglement, while a cutout 16 facilitates the assembly / disassembly of the hub wheels; a horizontally protruding, abrasive medium 23 allows improved visual control during use.

Description

The present invention is directed to an improved abrasive device according to the preamble of the independent claim.

TECHNICAL BACKGROUND

The general, technical area is the area of abrasives, which are used for conditioning and / or cleaning surfaces. Depending on the roughness and grain size of an abrasive medium and on the circumstances and the duration of the use of such a medium, such abrasives allow a variety of applications, which range from the coarse, substantial removal of matter to cleaning and polishing applications to honing and / or smoothing particularly planar surfaces for special applications are sufficient.

The CH 257 128 A1 illustrates common and established designs and known measures in this area. Disc-shaped or ring-shaped solid bodies are known which are attached to a rotating drive as in FIG 4th as set out in this document. The rotating disk / ring carries an abrasive medium which will interact with a material when said material is brought into contact with the rotating surface of the disk / ring. Applications such as polishing, grinding or cutting are possible. In the same way, US 2004/0053569 A1 teaches that conventional hub cleaning takes place using a grinding wheel or sandpaper. In order to obtain a smooth and clean surface, this document proposes attaching an annular grinding body detachably to an annular end face of a rotatable, bell-shaped receiving body, the receiving body in turn being able to be guided by hand. However, the bell-shaped receiving body alone allows abrasive media to be received on its annular end face. Furthermore, the receiving body consists of a single, bell-shaped, hard polymer body, as a result of which any impact or jolt is disadvantageously transmitted directly into the hard polymer structure, which causes direct stress and associated wear on the body in the force-transmitting sections.

From the U.S. 4,694,615 A1 a grinding wheel with a deeper center is known, the hub of the grinding wheel being attached to a rotating rod via a retaining nut and a matching cup-shaped retaining flange.

A general problem with these rotating, abrasive media is the damaging impact effect caused by uneven structures that have to be treated: Uneven elevations within a surface generate shocks and impacts which act directly on the non-positive and force-transmitting connections between the abrasive medium / carrier and the rotating drive. The established connections such as a central threaded rod with a clamping nut are therefore subject to recurring bumps and blows and suffer considerable wear.

• Aus der GB 718,149 A ist ein Feststell-Mechanismus bekannt, welcher einen Schleifkopf mit einer rotierenden Säule verbindet. Der Feststell-Mechanismus sieht einen konischen Kopf vor, welcher in ein zylindrisches Sackloch unter Federspannung eingreift. Überschreitet ein Schlag eine vorgegebene Stärke wird der konische Stift nach Außen in eine gleitende Position geschoben; dadurch werden destruktive Kräfte vermieden, welche auf Grund eines festgekeilten abrasiven Mediums, welches in seiner Bewegung blockiert ist, auftreten würden.

Various designs are known from the prior art, which are intended to improve this basic flow of forces:

• From the GB 718,149 A a locking mechanism is known which connects a grinding head to a rotating column. The locking mechanism provides a conical head which engages in a cylindrical blind hole under spring tension. If an impact exceeds a predetermined strength, the conical pin is pushed outwards into a sliding position; this avoids destructive forces which would occur due to a tightly wedged abrasive medium which is blocked in its movement.

From the DE 34 39 230 C1 it is known to connect an abrasive, rotating medium to a drive via an elastomer body, as a result of which shocks and impacts are dampened within the solid elastomer structure.

The WO 2008/069424 A1 on the other hand suggests screwing a carrier plate with a thread on the edge into the edge of a bell-shaped receiving body protruding from the underside. A vibration-damping, elastic intermediate layer is inserted between the carrier plate and the receiving body. For additional security, screws are then firmly screwed into the carrier plate through the outside of the receiving body. Disadvantageously, the transversely screwed in screws prevent elastic yielding of the screwed-in carrier plate in the mount. The DE 10 2004 001 580 B3 on the other hand suggests a tool head 10 , which can accommodate a bell-shaped grinding medium, to be attached to a drive via a multi-part holder equipped with several intermeshing threads. In this case, a force-conducting spring in one of the thread transitions permanently provides elastic damping that compensates for impacts and pulses. The AT 278570 B alternatively teaches screwing a carrier plate with a protruding external thread into a driven carrier with an internal thread, the coupling part being made of elastic plastic in order to achieve improved damping. The three types of construction described above, however, cannot use a grinding medium while a carrier is being screwed into a mount with fixing clamps at the edge.

STATE OF THE ART

From the DD 258 765 A1 a device is known in which two hub wheels are arranged one inside the other in order to hold an annular, abrasive medium, arranged between the outer, protruding edges. Such a fastening clamp allows the abrasive media to slide and move if they are blocked on an uneven surface, but impacts are also transmitted at the same time via a central connection to the connected shaft and drive. The present invention is based on this type of design. The U.S. 3,757,378 A1 in the same direction discloses a polishing / grinding machine for ring-shaped polishing media, in which several ring bodies, comprising the polishing medium, are gripped between the outwardly protruding edges while a lower hub wheel is being screwed into an upper hub wheel connected to a drive and be fixed.

A disadvantage of the devices available here is that they do not allow all available abrasive media to be attached. While some require at least one ring-shaped, flat surface for the reversible attachment of pads or sponges, others provide for form-fitting notches or edges to be clamped in. No device is known which would allow the quick and easy exchange of one type of abrasive medium for another, e.g. B. Replacing a C-shaped ring body with a flat, circular pad.

Another problem is that many devices still transmit bumps or blows directly into the centered drive and into its connection with the media mount / bracket. The use of damping structures which have elastic properties results in a connection with increased elastic force, which makes disassembly difficult and often requires special tools or keys to loosen the connection.

Another problem are alloys that provide the necessary stability and strength to withstand impacts or blows; these are expensive and will wedge themselves in place once dust gets into a threaded connection with such an alloy; however, in the case of the use of abrasive media, dust can be found everywhere, which leads to irreversibly jamming screw connections in which it is almost impossible to disassemble.

Another problem is that many abrasive devices provide special extensions and / or special adapter connections which enable connection to a drive; if such an adapter is lost or damaged, the entire device can be rendered unusable.

The object of the present invention is to offer an abrasive device which overcomes the disadvantages of the prior art and provides an improved device for using a rotating, abrasive surface.

This object is achieved according to the features of the independent claim. Advantageous features and / or preferred features which take further problems into account can be found in the dependent claims and the following description.

SUMMARY OF THE INVENTION

In accordance with the present invention, an improved abrasive device for applying a rotating abrasive surface has an upper hub wheel 10 on and a lower hub wheel 20th which are arranged one inside the other, with the upper hub wheel 10 and the lower hub wheel 20th can be connected via thread 30th , said thread 30th are formed on the steep, mutually fitting sides 11 , 21st the hubs and other features are designed as specified in the independent claim.

DESCRIPTION OF THE INVENTION AND ADVANTAGEOUS FEATURES

A “hub wheel” is a generally bell-shaped or cup-shaped component that has an outer, horizontally protruding edge and a “hub”, ie an upwardly curved inner core. Said hub / core section has a symmetrically extended, tubular section which connects the lower, outer edge with an upper apex. In the case of a substantially vertical tube and a horizontal apex, such a hub wheel resembles in cross section a pot with vertical sides and a wide, protruding edge in an overhead arrangement; on the other hand, a conical tube shape will result in a cross-section with a trapezoidal appearance, with inclined sides connecting a lower, wider edge with an upper, narrower apex. In the present description, “horizontal” is intended to denote a direction essentially perpendicular to the axis of rotation, while “vertical” describes a direction oriented essentially parallel to the axis of rotation. Furthermore, the horizontally protruding edge of a hub wheel should be referred to as the 'lower' part of the hub wheel, while the indented core and its final vertex are referred to as the 'upper' part, which are thus 'above the edge'.

The two hub wheels 10 , 20th of the present invention are to be arranged one inside the other, ie the lower hub of the lower hub wheel 20th is the same or smaller in diameter and / or - in the case of trapezoidal shape - has an outer profile which is the same size or smaller in size compared to the dimensions of the hollow shape / hub of the upper hub wheel 10 . So can the lower hub wheel 20th inside the upper hub wheel 10 be arranged, the lower hub correspondingly extends into the upper hub.

The lower hub wheel 20th has at least one external thread, while the upper hub wheel has at least one internal thread; both threads 30th are arranged in areas where the two hub wheels 10 , 20th can be arranged close enough to each other to allow coupling of said threads 30th to allow which ones on the steep, mating sides 11 , 21st of the two hubs are arranged. It goes without saying that the threads 30th are deep enough to effectively couple with one another and that surfaces are spatially arranged close enough to one another to allow sufficient engagement.
Preferably the threads are 30th designed so that a gap between the threads a thermal expansion of the lower hub wheel 20th when cutting or grinding / polishing allows for materials that generate significant frictional heat such as metal oxides / ceramics.
The threads preferably have 30th an elastic, replaceable component in its end portions, which allows adjustment of an elasticity of a fixed connection to predetermined values; the elastic component is particularly preferably an elastic polymer; most preferred is the elastic component in the embedded crown area between the hub wheels 10 , 20th arranged.

The assembly of the device according to the invention is carried out by screwing in the lower hub wheel 20th in the upper hub wheel 10 until a firm connection is provided; a direction of rotation is preferably used as a predetermined value on the outside of the upper hub wheel 10 and is oriented opposite to the screw connection, ie during use the lower hub wheel 20th continuously into the upper hub wheel 10 pushed in by the frictional resistance, improving the connection, performance and reliability.

By arranging the threads 30th closer to the outer edge, impact forces that affect the outer edge are exerted with a significantly smaller lever, while the thread as such becomes considerably longer. The inventors assume that these two effects are responsible for the improved performance of the device according to the invention: The threads 30th are significantly better wear-resistant and show a significant reduction in wear while connecting the hub-wheels 10 , 20th have no tendency to wedge in an over-tight, tightened connection. The threads 30th are only elastically deformed, even when treating inhomogeneous materials such as concrete mixtures with coarsely crushed ceramic additives where sudden changes in frictional resistance are unavoidable.

The claimed device is advantageously characterized in that the ratio of external diameters 22nd of the lower hub wheel 20th to inner diameter 25th of the lower hub wheel 20th is not greater than 8/1.
Keeping the diameters in this range enabled the use of softer metals and alloys, which could significantly reduce manufacturing costs. The ratio of external diameters is preferred 22nd of the lower hub wheel 20th to inner diameter 25th held between 5/1 and 1.6 / 1. Within this range, polymer materials can be used to provide at least one of the hub wheels while still maintaining performance and wear resistance at the highest level.
In particular, composite bodies with a metal endoskeleton and a plastic body with a preferably fiber-reinforced polymeric component could be used for all applications without the metal endoskeleton separating from the surrounding polymer matrix.
The ratio of external diameters is particularly preferred 22nd of the lower hub wheel 20th to inner diameter 25th held between 3.1 / 1 and 1.7 / 1, which allows the use of wear-resistant combinations of materials of a more elastic nature but lower strength. Such combinations are particularly versatile when it comes to holding various abrasive media, ranging from abrasive rings with a C-shaped cross-section, which are placed on the lower hub wheel 20th to be arranged and elastic between the protruding edges of the two hub wheels 10 , 20th are to be clamped in place using elastic strips or pads on the lower hub wheel 20th be fastened by adhesive bonding up to solid composite bodies which contain an abrasive in a matrix and are reversibly fastened via a Velcro surface or a similar thread connection; this enables diverse modes of operation such as cutting and voluminous Sand down without the need for any other special tools or devices.
In a particularly advantageous embodiment, the abrasive medium consists of several parts which are detachably connected and thus allow a sequence of work without a single change; ie, a resilient, C-shaped ring having a resilient pad with an attached, rough abrasive strip, allows coarse grinding, removal of the strip, fine sanding using the pad, removal of the pad and final polishing using a fine polishing agent which is inside the polymer matrix of the ring is arranged, only the removal of the corresponding medium part after completion of the respective step is necessary. In view of the foregoing, the present invention also discloses an advantageous method of abrading and subsequent polishing, comprising the use of at least three removably connected abrasive media.

The claimed device is advantageously characterized in that the upper hub wheel 10 a socket 13 has the socket-sleeve 13 form-fittingly enclosing a central connection means for transmitting torque. The transmission of a rotational force, ie the imparting of a rotary movement, requires considerable forces. By enclosing the corresponding, central connecting means with a socket sleeve 13 dangerous gaps or edges are covered and tightly closed, which for example reduces the risk of dangerous pulling in of the user's clothing. The socket preferably has a sleeve 13 Covering sections made of an elastic, low-friction polymer which precisely cover and enclose gaps and grooves, the surface being so low-friction that even when actually caught, it is highly unlikely that it will be drawn in; In addition, such a low-friction material offers the advantageously reduced tendency to collect dust and will prevent dust from penetrating the non-positive connection between the drive and the abrasive device.

The claimed device is advantageously characterized in that the upper hub wheel 10 a locking mechanism 14th has for torque transmission. A locking mechanism has engagement or tensioning means such as steel balls, which can be brought into engagement with a drive or corresponding gear, preferably by manual operation. A locking mechanism allows 14th Advantageously, the quick and easy manual exchange of the device and / or the drive without the need for additional tools. Examples of established construction methods in this area can be found in the GB 1 108 248 A1 or the US 3 816 015 A1 , to which relevant measures and design features are comprehensively referred to by this reference.

Preferably the locking mechanism 14th combined with a socket 13 designed, which provides a quick-change mechanism, which advantageously improves safety during use and prefers dust to penetrate the locking mechanism 14th prevents, whereby the wear is significantly reduced.
The locking mechanism preferably comprises 14th an outer, symmetrical hinge clamping bracket, which enables a quick release function by releasing the clamping bracket with a single movement, the clamping bracket having an even, radial distribution of the weight, whereby any risk of opening by centrifugal forces during use is eliminated.
The locking mechanism preferably comprises 14th a drive locking mechanism, which enables the fixation of the device in a relative position and the unscrewing of the lower hub wheel 20th facilitated.

The claimed device is advantageously characterized in that the upper hub wheel 10 a central socket 15th has as a central connection means, the central socket 15th can be connected to a polygonal shaft to enable torque transmission. A polygonal shaft has edges which can be effectively engaged and interacted with a corresponding bracket; Such systems are known from special screwdrivers and appropriately recessed screws such as hexagon fitting screws.
The central socket preferably has 15th Receiving means on which allow the receiving of several different, common shaft types.
The central socket preferably has 15th Recording means on which a locking mechanism 14th comprise, which in turn preferably comprises metal disks and / or metal balls made of a high-strength alloy in order to be able to accommodate and securely hold a polygonal shaft during insertion.
Such a central bushing is preferred 15th with the upper hub wheel 10 releasably connected, particularly preferably via an elastic, wear-resistant polymer, which can be removed mechanically in combination with excessive, embrittling heat but otherwise provides a permanent, elastic and force-transmitting connection.

The claimed device is advantageously characterized in that the upper hub wheel 10 has a central connection means, which allows the connection of pneumatic drives and / or wrenches.
Pneumatic actuators and / or wrenches provide two major advantages; On the one hand, pneumatic systems are often already available even in smaller workshops and, on the other hand, a pneumatic drive is driven by gas pressure, ie force is transmitted elastically and evenly due to the pneumatic expansion of the driving compressed air. As a result, even small workshops are able to use the advantageous, abrasive device with improved smooth acceleration, improved speed and smooth acceleration properties, resulting in improved overall performance at an extremely low price, since a special drive does not have to be purchased. In view of this, the present invention also discloses an advantageous use of the claimed abrasive device.
Such a central connection means preferably comprises a safety valve which releases pressure at an excessively high rotational speed, whereby the safety of the device is additionally improved by a very simple and effective constructive measure.

The socket advantageously encloses the sleeve 13 form-fit the central socket 15th ; the central socket 15th is a central connecting means, which can be connected to a polygonal shaft and enables the transmission of a rotational force. The locking mechanism 14th is inside the central socket 15th arranged and can engage in optional grooves of a shaft, whereby the established connection is improved in stability and security. The socket 13 is with the locking mechanism 14th connected by spring force; the spring force causes both a quick change function for a connected shaft and the fixing of the socket 13 in an enclosing position while a polygonal shaft is connected. The central socket 15th , which can be connected to pneumatic drives and / or wrenches, leads to a combination of features that improve user acceptance, usability and security in an outstanding manner.

The claimed device is advantageously characterized in that the lower hub wheel 20th at least one other abrasive medium 23 which is selected from the group consisting of pad, strip, disc, sponge, composite body, sponge containing abrasive particles, fiber body, fiber body containing abrasive particles, filaments, textile product, woven textile product, non-woven textile product, fiber body containing metal fibers , detachable pad, detachable strip, detachable disc, detachable sponge containing abrasive particles, detachable fiber body, detachable fiber body containing abrasive particles, detachable filaments, detachable fabric, detachable woven fabric, detachable nonwoven fabric, detachable fibrous body containing metal fibers, glued on Pad, glued strips, glued disc, glued sponge, glued fiber body, glued filaments, glued textile product, glued woven textile product, glued non-woven textile product.
An abrasive medium is preferred 23 applied using an adhesive; Adhesives are widespread and provide a number of advantageous properties (e.g. detachable or permanent adhesives, elastic, thermosetting or thermoplastic adhesives or combinations of the aforementioned) which can be adapted to the respective requirements. Particularly preferably, an adhesive is set in such a way that there is a permanent connection of the abrasive media, but disintegration / loosening occurs when overheating and / or a solvent is applied, which potentially increases both safety (thermal decomposition at excessive heat) and usability (detachable / replaceable by a solvent) can be improved.
The abrasive medium is / comprises preferably 23 a textile product. Textiles are woven from threads; The type and arrangement of said threads offer selectable, advantageous properties, e.g. B. a plain weave of different fibers with a given proportion of carbon fibers and polymer fibers with abrasive particles will provide a sheet-like, abrasive medium, showing two sides of the same effectiveness, whereby the carbon fibers set reducing, chemical conditions, while the abrasive particles create freshly exposed surfaces, which provides optimal conditions for subsequent coating of a surface with oxidizing coating or oxidizing lacquer. The abrasive medium is / comprises preferably 23 a non-woven textile product such as a fleece, which is particularly advantageous for polishing applications, especially in the case of natural fibers arranged randomly and evenly, having protective layers of natural oils / fats.
The abrasive medium preferably comprises 23 an abrasive structure with improved stiffness such as strips or composite bristles, which allow the transmission of greater forces and at the same time provide abrasive particles in a matrix for an improved grinding effect. Such structures allow the rapid and substantial removal of material in an advantageous combination with improved stability of the abrasive medium 23 . The abrasive medium preferably has 23 a diameter no greater than 130% of the diameter of the lower hub wheel 20th is, whereby the leverage of bumps or blows is kept in a predetermined range, whereby also an outstanding wear resistance of the connection between the two hub wheels 10 , 20th is ensured even when cutting operations or local removals are carried out.

The claimed device is advantageously characterized in that at least one hub wheel 10 , 20th consists at least partially of at least one material, the material selected from the group consisting of polymer, copolymer, terpolymer, copolymerized prepolymer, PP, ABS, metal, light metal, aluminum, abrasive material, preferably at least partially composed of a composite material, preferably of a composite material containing a metal endoskeleton, particularly preferably a composite material containing a metal endoskeleton and a component containing an abrasive medium.

PP (polypropylene) is preferably used for those parts that must have strength and heat resistance; In use, a PP carrier could withstand peak temperatures of up to 130 ° C in cutting operations without showing any decrease in stability.
ABS is preferably used for those parts that must be stable under aqueous, aggressive conditions, such as. B. when polishing or cutting using aggressive, aqueous acid, base or an oxidizing cutting oil.
Aluminum is preferably used for parts that require a large, abrasive surface in combination with improved strength; Aluminum offers sufficient stability with an exceptionally low weight, which in particular improves user acceptance for manual use: A user will find such a tool to be lightweight and easy to handle, while providing superior abrasive performance.

The claimed device is advantageously characterized in that the upper hub wheel 10 at least one section 16 on his side 11 and the lower hub wheel 20th at least one hole 24 on his side 21st having, the hole 24 through the neckline 16 is accessible when the top hub wheel 10 and the lower hub wheel 20th are arranged connected to each other.

A hole 24 offers the possibility of inserting a rod or a tool in order to be able to apply a stronger force to dismantle the abrasive device: the right cutout 16 allows a rod or tool to be inserted into the hole 24 ; the hole can be any type of hole, including pin holes, blind holes and through holes, as long as a force-transmitting insertion of the rod or tool is possible in order to provide the appropriate leverage.
The mounted, abrasive device is preferably fixed in place by locking the upper hub wheel 10 via an appropriate drive or a locking mechanism.
The combination of hole 24 and cutout 16 Allows a stick or tool to be used around the top hub wheel as described above 10 from the lower hub wheel 20th to solve, which advantageously allows the rapid replacement and / or adaptation of the abrasive device, particularly in areas of application in which established abrasive devices are awkward to operate or adapt.

Further advantages arise in view of the following explanation of advantageous embodiments. It goes without saying that the above-described, preferred and / or advantageous features and the following exemplary embodiments are not to be seen as restricting the invention to these features or their combinations: Further advantageous / preferred features and further combinations of features as explained in the description or in different ways Combinations can additionally be realized in the subject matter of the independent claims without departing from the scope of the invention / the claimed protection area.

Figure list

• 1 eine vorteilhafte Ausführungsform eines oberen Naben-Rads 10
• 2 eine vorteilhafte Ausführungsform eines unteren Naben-Rads 20
• 3 eine vorteilhafte Ausführungsform einer verbesserten, abrasiven Vorrichtung in Explosionsdarstellung
• 4 eine vorteilhafte Ausführungsform einer verbesserten, abrasiven Vorrichtung in zusammengebauter Form
• 5 eine vorteilhafte Ausführungsform einer zusammengebauten, verbesserten, abrasiven Vorrichtung aufweisend zwei trapezoide Naben

The figures illustrate schematically in ...

• 1 an advantageous embodiment of an upper hub wheel 10
• 2 an advantageous embodiment of a lower hub wheel 20
• 3 an advantageous embodiment of an improved, abrasive device in an exploded view
• 4th an advantageous embodiment of an improved, abrasive device in assembled form
• 5 an advantageous embodiment of an assembled, improved, abrasive device comprising two trapezoidal hubs

DETAILED EXPLANATION OF THE INVENTION ON THE HAND OF ADVANTAGEOUS EXEMPLARY EMBODIMENTS

• - das obere Naben-Rad 10 und das untere Naben-Rad 20 über Gewinde 30 verbindbar sind,
• - die Gewinde 30 auf den steilen, ineinander passenden Seiten 11, 21 der Naben ausgebildet sind,
• - das Verhältnis äußerer Durchmesser 22 des unteren Naben-Rads 20 zu innerem Durchmesser 25 des unteren Naben-Rads 20 zwischen 3,1/1 und 1,7/1 gehalten ist,
• - das obere Naben-Rad 10 eine Fassungs-Hülse 13 aufweist, besagte Fassungs-Hülse formschlüssig umschließend eine mittige Buchse 15, die mittige Buchse 15 ausgebildet als ein mittiges Anschlussmittel, welches an einen polygonalen Schaft anschließbar ist und die Übertragung einer Drehkraft erlaubt,
• - das obere Naben-Rad 10 aufweisend einen Feststell-Mechanismus 14 innerhalb der mittigen Buchse 15, wobei der Feststell-Mechanismus 14 ausgebildet ist um in optionale Rillen des Schafts einzugreifen,
• - die Fassungs-Hülse 13 mit dem Feststell-Mechanismus 14 unter Federspannung verbunden ist, bereitstellend sowohl eine schnelle Auswechselbarkeit eines verbundenen Schafts als auch das Fixieren der Fassungs-Hülse 13 in umschließender Position während ein polygonaler Schaft angeschlossen ist,
• - die mittige Buchse 15 erlaubend das Anschließen von pneumatischen Antrieben und/oder Schraubenschlüsseln,
• - das untere Naben-Rad 20 umfassend mindestens ein abrasives Medium 23 ausgewählt aus der Gruppe bestehend aus Streifen, Textilerzeugnis, gewebtes Textilerzeugnis, nicht gewebtes Textilerzeugnis, Filament-Körper,
• - das obere Naben-Rad 10 mindestens einen Ausschnitt 16 in seiner Seite 11 aufweist,
• - das untere Naben-Rad 20 mindestens ein Loch 24 in seiner Seite 21 aufweist
• - und dass das Loch 24 durch den Ausschnitt 16 zugänglich ist wenn oberes Naben-Rad 10 und unteres Naben-Rad 20 in miteinander verbundener Anordnung sind.

An advantageous embodiment of an improved, abrasive device for using a rotating, abrasive surface has an upper hub wheel 10 and a lower hub wheel 20th which are arranged one inside the other, where ...

• - the upper hub wheel 10 and the lower hub wheel 20th via thread 30th are connectable,
• - the threads 30th on the steep, mutually fitting sides 11 , 21st the hubs are designed,
• - the ratio of external diameters 22nd of the lower hub wheel 20th to inner diameter 25th of the lower hub wheel 20th is kept between 3.1 / 1 and 1.7 / 1,
• - the upper hub wheel 10 a socket 13 has, said socket sleeve positively enclosing a central socket 15th , the central socket 15th designed as a central connection means which can be connected to a polygonal shaft and allows the transmission of a rotational force,
• - the upper hub wheel 10 having a locking mechanism 14th inside the central socket 15th , the locking mechanism 14th is designed to engage in optional grooves in the shaft,
• - the socket 13 with the locking mechanism 14th is connected under spring tension, providing both a quick interchangeability of a connected shaft and the fixing of the socket sleeve 13 in an enclosing position while a polygonal shaft is connected,
• - the central socket 15th allowing the connection of pneumatic drives and / or wrenches,
• - the lower hub wheel 20th comprising at least one abrasive medium 23 selected from the group consisting of strip, fabric, woven fabric, non-woven fabric, filament body,
• - the upper hub wheel 10 at least one section 16 in his side 11 having,
• - the lower hub wheel 20th at least one hole 24 in his side 21st having
• - and that the hole 24 through the neckline 16 is accessible when the upper hub wheel 10 and lower hub wheel 20th are in interconnected arrangement.

1 Fig. 11 illustrates an advantageous embodiment of an upper hub wheel 10 , having a socket 13 , steep, essentially vertical sides 11 , a central hub, said hub having cutouts 16 in the sides 11 .
The tightly enclosing socket 13 is directly at the horizontal apex of the upper hub wheel 10 attached and leaves no gap or edge which could endanger a user during use.
The cutout 16 is of a preferred, elongated, slot-like shape and is capable of several as well as different holes of a connected, lower hub wheel 20th keep it easily accessible. The slit-like shape of the neckline 16 allows the connection of various lower hub wheels 20th , which are all about the advantageous versatile neckline 16 would be accessible. So offers a combination of this upper hub wheel 10 with different types of lower hub wheels 20th a fault-free method of connection: the elongated shape ensures - regardless of how the corresponding thread 30th be screwed into each other - that a corresponding hole 24 will always be accessible.

2 illustrates an advantageous embodiment of a lower hub wheel 20th , having steep, substantially vertical side 21st a central hub, the lower part of the side being threaded 30th is provided, while the upper part has four equally spaced holes 24 having arranged in a horizontal plane. While the thread 30th a secure, improved connection to an upper hub wheel 10 allows provide the holes 24 the possibility of quick disconnection using a rod, tool or wrench attached to the hole 24 through a cutout 16 be connected through and allow the application of a separating force with considerable leverage.

3 illustrates an advantageous embodiment in an exploded view, in which individual components are arranged at a distance from one another. The upper hub wheel 10 and the lower hub wheel 20th are to be arranged one inside the other, connectable via thread 30th , the thread 30th of the upper hub wheel only partially through the cutout 16 is visible. The threads 30th are on the steep, essentially vertical, mating sides 11 , 21st of the hubs, with the mating, inner, vertical side of the upper hub wheel 10 is not visible. Viewed in vertical section, this arrangement would resemble, in the assembled state, a double-walled, vertically extending pot in the overhead position, which rests on its horizontally protruding edge. The ratio of the outer diameter 22nd of the lower hub wheel 20th to the inner diameter 25th of the lower hub wheel 20th is kept between 3.1 / 1 and 1.7 / 1 and thus enables the selection of advantageous structures and materials for one or both hub wheels 10 , 20th . The upper hub wheel 10 has a socket 13 on which a central socket 15th encloses precisely and advantageously improves safety during use. The central socket 15th serves as a central connection means, can be connected to a polygonal shaft and allows the transmission of a torque. A locking mechanism 14th inside the central socket 15th enables an engagement in optional grooves of a shaft via metal disks made of a high-strength alloy, which improves both the strength of the holder and the stability of the force transmission. The socket 13 is with the locking mechanism 14th connected under spring tension and provides a quick-change mechanism for changing a connected shaft or drive and holds the socket 13 in an enclosing position while the polygonal shaft is inserted. The central socket 15th enables a pneumatic drive and / or wrench to be connected, which provides a low-priced device with a significantly more uniform and durable application. The lower hub wheel 20th comprises at least one abrasive medium selected from the group consisting of strips, fabric, woven fabric, non-woven fabric or filamentary body. A filament body advantageously consists of monofilament, solid fibers, which are advantageously applied as bristles with outstanding high pressure over their tips, which provides a very effective, abrasive function in the case of monofilament fibers which carry abrasive particles in their carbon-containing or polymeric matrix. The abrasive medium extends horizontally and has an outer rim whose diameter is larger than the diameter of the lower hub wheel 20th which provides an exposed, outer edge that allows ablation and / or cutting point treatments on a surface. The upper hub wheel 10 has at least one cutout 16 in his side 11 on which to at least one hole 24 in the side 21st of the lower hub wheel 20th fits. The hole 24 is through the neckline 16 accessible if upper hub wheel 10 and lower hub wheel 20th in an assembled configuration allowing for quick, improved disassembly of the top hub wheel 10 and lower hub wheel 20th allows if the abrasive device is to be converted for further and / or other measures.

4th Fig. 11 illustrates an advantageous embodiment of a composite, improved, abrasive device, e.g. B. according to 3 . This figure shows the smooth and continuous outer shape of the advantageous, abrasive device in an assembled position due to the socket 13 and the advantageously matching diameters of the outer edges of the upper hub wheel 10 and lower hub wheel 20th . The abrasive medium advantageously has 23 a horizontally protruding, outer edge, which offers better, visual control during use and enables a much easier removal by simply pulling off the medium manually, the protruding edge being used as a tab or handle.

5 illustrates in a schematic sectional view an advantageous embodiment of a composite, improved, abrasive device with two trapezoidal hubs, the threads 30th are arranged on the inclined sides. The inclination of the sides in this particular embodiment results in a smaller area in which the threads 30th can couple effectively. On the other hand, a trapezoidal outer shape of the hub advantageously reduces the risk of dangerous entanglement. As this figure shows, threads can 30th also a plurality of short, coupling threads 30th which couple effectively in a small area and preferably a substantial angle of inclination of the sides 11 , 21st allow up to 45 ° inwards (90 ° indicative of vertical alignment / no inclination); several, short, parallel threads 30th offer the advantage of a quick release connection from the upper hub wheel 10 with lower hub wheel 20th : The number of turns necessary to make the threads 30th Bringing them into firm connection is significantly reduced. The connection of the hubs can be achieved here by a short twist, most preferably with less than 270 ° (360 ° designating a full turn describing a circle). Such a connection is in combination with the section described above 16 and the matching hole 24 particularly easy to use, a simple rod or screwdriver being used to apply the lever force, most preferably allowing complete assembly / disassembly in combination with matching, slit-shaped, sloping cutouts 16 showing the holes 24 Keep it accessible throughout the entire turning process.

List of reference symbols

10

upper hub wheel

11

page

13

Socket

14th

Locking mechanism

15th

central socket

16

Cutout

20th

lower hub wheel

21st

page

22nd

outer diameter

23

abrasive medium

24

hole

25th

inner diameter

30th

thread

Claims (3)

Improved abrasive device for applying a rotating, abrasive surface, comprising an upper hub wheel (10) and a lower hub wheel (20) which are nested, the upper hub wheel (10) and the lower hub wheel Wheel (20) can be connected by means of threads (30), said threads (30) being formed on the steep, mutually fitting sides (11), (21) of the hubs and both hub wheels (10, 20) protruding outward edges have, between which at least one abrasive medium can be clamped, the device having in detail the features that - the upper hub wheel (10) and the lower hub wheel (20) can be connected via threads (30), - the threads (30) are formed on the steep, mutually fitting sides (11), (21) of the hubs, - the ratio of the outer diameter (22) of the lower hub wheel (20) to the inner diameter (25) of the lower hub wheel (20) is kept between 3.1 / 1 and 1.7 / 1, - The upper hub wheel (10) has a socket sleeve (13), said socket sleeve positively enclosing a central bushing (15), the central bushing (15) designed as a central connecting means which can be connected to a polygonal shaft and allows the transmission of a torque, - The upper hub wheel (10) having a locking mechanism (14) within the central bushing (15), the locking mechanism (14) being designed to engage in optional grooves in the shaft, - the socket (13) is connected to the locking mechanism (14) under spring tension, providing both quick interchangeability of a connected shaft and the fixing of the socket (13) in an enclosing position while a polygonal shaft is connected, - the central socket (15) allows the connection of pneumatic actuators and / or wrenches, - The lower hub wheel (20) comprising at least one abrasive medium (23) selected from the group consisting of strips, textile product, woven textile product, non-woven textile product, filament body, - the upper hub wheel (10) has at least one cutout (16) in its side (11), - The lower hub wheel (20) has at least one hole (24) in its side (21) - and that the hole (24) is accessible through the cutout (16) when the upper hub wheel (10) and lower hub wheel (20) are connected to one another. Device according to one of the preceding claims, characterized in that the lower hub wheel (20) comprises at least one further, abrasive medium (23) which is selected from the group consisting of pad, strip, disc, sponge, composite body, containing sponge abrasive particles, fiber bodies, fiber bodies containing abrasive particles, filaments, fabric, woven fabric, non-woven fabric, fiber body containing metal fibers, removable pad, removable strip, removable disc, removable sponge containing abrasive particles, removable fiber body, removable Fiber bodies containing abrasive particles, detachable filaments, detachable textile product, detachable woven textile product, detachable non-woven textile product, detachable fiber body containing metal fibers, glued pad, glued strips, glued disc, glued sponge, glued fiber body, glued filaments, glued on Fabric, adhered woven fabric, adhered non-woven fabric. Device according to one of the preceding claims, characterized in that at least one hub wheel (10, 20) consists at least partially of at least one material, the material selected from the group consisting of polymer, copolymer, terpolymer, copolymerized prepolymer, PP, ABS, Metal, light metal, aluminum, abrasive material, preferably at least partially composed of a composite material, preferably of a composite material containing a metal endoskeleton, particularly preferably a composite material containing a metal endoskeleton and a component containing an abrasive medium.

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