Abstract: A method and an apparatus for releasably attaching a polishing pad to a support surface under the polishing pad. In one embodiment of the invention, a polishing pad has a first surface for planarizing a substrate assembly, a second surface contacting the support surface, and an interlocking element. The support surface has a retaining member configured to engage the interlocking element on the polishing pad. The interlocking element and retaining member can be any one of several configurations, including: tongue and groove, protuberance and depression, reciprocal elongated ridges, or teeth.

Abstract: A sanding pad with a circular cross section for a manually operable grinding device has one 'surface with means (2) for connection to the grinding device. An opposite surface (6) forms a contacting surface (5) for guiding an abrasive. The contacting surface (5) is provided with radially extending grooves (1), which are constructed open towards the contacting surface (5), in order to increase the abrading performance of the sanding pad (2).

Abstract: An adapter and abrasive articles for use with automated abrading equipment. The adapter includes a first surface for the releasable mounting of abrasive articles, such as those mounted with releasable adhesive, and a second surface for releasable mounting to automated equipment. The second surface may contain hook and/or loop like structures or other non-adhesive based mounting mechanisms, and the adapter may include magnetic material. Abrasive articles are also disclosed that include magnetic material and/or sections with both hook and loop like structures.

Abstract: A grinding wheel has a base ring, a positioning disk disposed on the base ring, a grinding cloth assembly disposed on the positioning disk, and an upper ring disposed on the grinding cloth assembly. The positioning disk has an upper annular flange and a circular hole. The upper ring has a round hole. The grinding cloth assembly has a first grinding cloth disk, a second grinding cloth disk, and a third grinding cloth disk adhered together. The upper annular flange passes through the first grinding cloth disk, the second grinding cloth disk, and the third grinding cloth disk to be inserted in the round hole of the upper ring.

Abstract: An adapter for use with automated abrading equipment. The adapter includes a first surface for the releasable mounting of abrasive articles, such as those mounted with releasable adhesive, and a second surface for releasable mounting to automated equipment. The second surface may contain hook and/or loop like structures or other non-adhesive based mounting mechanisms, and the adapter may include magnetic material.

Abstract: This invention provides a fixture for an abrasive cloth paper in which a surface fastener does not have to be bonded prior to fixing of the abrasive cloth paper onto the fixture and in which hook-shaped engaging elements are disposed accurately at portions directly related to polishing by an abrasive cloth paper fastening portion of the fixture with precedence. A fixture made of synthetic resin comprises a mounting portion which is engaged with/disengaged from a base plate of a sander and a fastening portion on which an abrasive cloth paper is wound and fastened. In the fastening portion, a plurality of surface fastener engaging element rows which are parallel to a direction of winding of the abrasive cloth paper are formed integrally so as to form a fastening surface. A hollow portion is formed in the fastening portion.

Abstract: A hub is disclosed for supporting and retaining at least one surface conditioning article relative to and spaced apart from a rotary shaft. The hub may be a hub of a brush assembly. The hub includes an arbor tube and a pair of plates. Shoulders are provided on the arbor tube and the plates are coupled to the arbor tube at a pre-determined distance set by shoulders. The surface conditioning article is provided between the plates. Since the distance between the plates is set by the shoulders, the density of the surface conditioning article between the face plates also is predetermined. The plates may include a key-shaped region with a circular portion and a keyseat. An adapter also may be provided. The adapter is configured and dimensioned to be engaged in the key-shaped region, permitting a shaft having a smaller diameter to be coupled to the hub.

Abstract: Backing plates are provided for use with abrasive disks designed to permit a view of the surface while abrading is occurring. This is achieved by the removal of portions of the circumference of the plate and preferably also viewing apertures in the body of the plate.

Abstract: A manually operated sander including a motor-driven grinding plate for treating a workpiece, and a device (2) for releasably clamping abrasive paper to the grinding plate, with the clamping device (2) having a clamping surface element (9) and a clamping stirrup (11) eccentrically pivotable with respect to the clamping surface element (9) for securing at least one end region (16) of the abrasive paper (3), with a gap (S) between a pivotal path (B) of the clamping stirrup (11) and the clamping surface element (9) substantially closing toward a region of the clamping surface element (9) that cooperates with the clamping stirrup (11) for clamping and end region (16) of the abrasive paper (3).

Abstract: A back-up pad for pad for supporting an abrasive article. A preferred embodiment of the invention provides a back-up pad having a dust collection groove, in which the engagement component for securing the abrasive article is attached to the dust collection groove surface. The present invention also provides a method for forming a back-up pad with a dust collection groove.

Abstract: A method and apparatus for planarizing a microelectronic substrate. In one embodiment, the apparatus can include an elongated polishing pad that is moved over a platen either between or during the planarization cycles, and a support pad that is moved along with the polishing pad. The support pad can be an elongated member that extends between a supply roller and a take-up roller, or can include a continuous member that extends around the spaced apart rollers. The platen can also be movable along with the support pad and can be supported by fluid jets, rollers, or a rotating bladder. Cleaning devices and/or milling devices can treat the surfaces of the polishing pad, the support pad and/or the platen to reduce the likelihood for contaminants to become caught between these components as they engage with each other.

Abstract: A method of producing an abrasive treatment disc is provided, whereby the disc is formed from an abrasive material (10) ultrasonically welded to a mounting member (14). The mounting member (14) may be used to attach the disc (10) to a tool for subseguent use.

Abstract: A polishing chip has its outer shape substantially the same as that of a semiconductor device, and is arranged to be mounted and dismounted to and from a semiconductor-device receiving socket (11) installed in a testing apparatus for evaluation of semiconductor devices. Distal end portions (15b) of contact pins (15) of the socket are brought in contact with an abrasive layer (22) formed in distal end portions of the polishing chip mounted to the socket, whereby distal ends of the contact pins are polished to remove foreign substances therefrom.

Abstract: A rotary polishing disc for dental grinding and polishing includes a disc-shaped piece of sheet of abrasive material fixed to a hub. In one embodiment, the hub is a hollow cylinder which is received onto a rotatable arbor. In another embodiment, the hub has a first end fixed to the sheet material, and has a second end that is received by a socketed end of the arbor. To fix the disc-shaped piece of sheet material more securely to the hub, a retainer plug may pass through a central aperture in the sheet material and enter into the hub. The retainer plug has a flat cap which becomes juxtaposed with the sheet material furthest from the hub. In another aspect, an improved arbor for the first type of hub includes protruding barbs which spear the hub when its hollow interior is disposed on the arbor.

Abstract: A rotary polishing disc for dental grinding and polishing includes a disc-shaped piece of sheet of abrasive material fixed to a hub. In one embodiment, the hub is a hollow cylinder which is received onto a rotatable arbor. In another embodiment, the hub has a first end fixed to the sheet material, and has a second end that is received by a socketed end of the arbor. To fix the disc-shaped piece of sheet material more securely to the hub, a retainer plug may pass through a central aperture in the sheet material and enter into the hub. The retainer plug has a flat cap which becomes juxtaposed with the sheet material furthest from the hub. In another aspect, an improved arbor for the first type of hub includes protruding barbs which spear the hub when its hollow interior is disposed on the arbor.

Abstract: A brush cutter adapted to be driven in rotary motion by a conventional machine tool. The brush cutter includes an annular wall having a cylindrical outer surface defining a longitudinal center axis. Front and rear faces are connected to opposing ends of the cylindrical outer surface. An arbor bore and a counterbore are concentrically disposed and coaxially aligned with the center axis. A plurality of brush assemblies are received within a plurality of circumferentially spaced axial and radial receiving bores. The axial receiving bores extend axially inwardly from the front face and the radial receiving bores extend radially inwardly from the cylindrical outer surface.

Abstract: Apparatus and a method of cold cross-sectioning soft materials includes providing a chuck attached to a drive motor with a composite plate attached to the chuck and including a heat insulating portion, a heat conducting layer, and a central axially extending duct with a plurality of radially extending conduits in communication therewith, the central axially extending duct is accessible externally for introducing a cooling liquid thereto. A sheet of grinding material is magnetically attached to the composite plate and the drive motor is activated to rotate the composite plate and grinding material. A cooling liquid is introduced into the duct and communicated to the conduits and a lubricant is supplied to the exposed rotating surface of grinding material.

Abstract: An orbital disc sander support is provided which may support an active orbital disc sander in a stationary position so that an operator can attend to other tasks without having to de-activate the sander or worry that the sander will fall off of the work area. This both helps to protect the sander and increases operator efficiency by eliminating time wasted waiting for the orbital disc to reach its operating speed or to stop before continuing with the next task. The support has a turntable, which includes a platform rotatably mounted to a base, and may employ a retaining wall for retaining the sander. The base may be provided with a cushion to absorb vibrations and to prevent the base from slipping off the work area. Alternatively, the base may simply be secured to the work area. The platform may also be provided with a rubber pad to help clean the sanding disc surface of the orbital disc sander.

Abstract: A method and an apparatus for releasably attaching a polishing pad to a support surface under the polishing pad. In one embodiment of the invention, a polishing pad has a first surface for planarizing a substrate assembly, a second surface contacting the support surface, and an interlocking element. The support surface has a retaining member configured to engage the interlocking element on the polishing pad. The interlocking element and retaining member can be any one of several configurations, including: tongue and groove, protuberance and depression, reciprocal elongated ridges, or teeth.

Abstract: A method and apparatus for planarizing a microelectronic substrate. In one embodiment, the apparatus can include an elongated polishing pad that is moved over a platen either between or during the planarization cycles, and a support pad that is moved along with the polishing pad. The support pad can be an elongated member that extends between a supply roller and a take-up roller, or can include a continuous member that extends around the spaced apart rollers. The platen can also be movable along with the support pad and can be supported by fluid jets, rollers, or a rotating bladder. Cleaning devices and/or milling devices can treat the surfaces of the polishing pad, the support pad and/or the platen to reduce the likelihood for contaminants to become caught between these components as they engage with each other.

Abstract: A method and apparatus for planarizing a microelectronic substrate. In one embodiment, the apparatus can include an elongated polishing pad that is moved over a platen either between or during the planarization cycles, and a support pad that is moved along with the polishing pad. The support pad can be an elongated member that extends between a supply roller and a take-up roller, or can include a continuous member that extends around the spaced apart rollers. The platen can also be movable along with the support pad and can be supported by fluid jets, rollers, or a rotating bladder. Cleaning devices and/or milling devices can treat the surfaces of the polishing pad, the support pad and/or the platen to reduce the likelihood for contaminants to become caught between these components as they engage with each other.

Abstract: A chemical mechanical polishing apparatus has a rotatable platen, a generally linear polishing sheet having an exposed portion extending over a top surface of the platen for polishing the substrate, and a drive mechanism to incrementally advance the polishing sheet in a linear direction across a top surface of the platen. The polishing sheet is releasably secured to the platen to rotate with the platen, and it has a width greater than a diameter of the substrate.

Abstract: A sanding sponge primarily used for sanding finished dry wall. In its least complicated embodiment, the tool is a hand-held sanding sponge made from a cellular foam material into a block having a top portion with a nonabrasive surface to ensure a comfortable grip and a bottom portion with an abrasive surface and acutely angled opposed edges, to allow the sponge to be used for sanding the corners and angles of finished drywall. In alternate embodiments the sanding sponge has means for attachment to a commercially available pole sander, or the sanding sponge may form an annular disk having a removable abrasive layer on one side and a hole formed through its radial center adapted for attachment: to an electric power sander.

Abstract: A method for manufacturing a sweeper or abrasive element is disclosed. The abrasive element is manufactured from a U-shaped plastic profile having an aperture in which are placed abrasive lamellae, supporting bristles and heat-dissoluble plastic threads. By heating above the plasticization temperature of the plastic, total embedding of the bristles and abrasive lamellae occurs thereby forming an integral unit. This ensures that the bristles and/or abrasive lamellae will not separate during use of rotating abrasive or polishing tools in which the abrasive elements are included. As the abrasive elements are of plastic material they are flexible and able to adapt to different diameters of abrasive or polishing tools. The user, therefore, only needs to have a supply of abrasive elements, cut into suitable lengths depending on the diameter of the tool in which the abrasive elements are to be replaced.

Abstract: A sanding brush assembly, includes a metallic base body formed with a plurality of grooves in spaced-apart disposition about its circumference or formed on its end face. Detachably received in form-fitting or force-fitting engagement in each of the grooves is a clamping element which supports a strip brush carrying an array of bristles. Disposed between successive strip brushes and supported by the strip brushes are respective sanding segments, whereby each sanding segment is mounted together with the associated clamping element of the strip brush by a flexible footing in the pertaining groove.

Abstract: A polishing cloth according to the present invention includes: a polishing cloth substrate; a pressure-sensitive adhesive layer laminated on one face of the polishing cloth substrate; and a release sheet attached to the pressure-sensitive adhesive layer in a releasable manner. The pressure-sensitive adhesive layer includes an adhesive composition containing a polymer, the polymer having a first-order melt transition in a temperature range narrower than 15° C. Thus, the present invention provides a polishing cloth and a method for attaching/detaching the polishing cloth to/from a base plate of a polishing machine such that the polishing cloth can be peeled off the base by simply cooling the base plate and the adhesive layer of the polishing cloth.

Abstract: A fixing member is provided for fixing a front end section to the rest of a base plate. The fixing member is provided with a surface fastener which is integrally molded with the fixing member.

Abstract: An adapter apparatus for use with a power operated surface preparation device comprising an upper cap positioned on a first end of a stainless steel spring and a lower cap positioned on a second end of the spring. The center of the upper cap has a threaded opening and the center of the lower cap has a threaded opening wherein a shaft of the power tool is fastened to the upper cap and a shaft of a disk is fastened to the center of the lower cap. The power device rotates at speeds up to 10,000 RPMs and the disk on the lower end adapter of the apparatus maintains close contact with a work surface while an operator exerts minimum force only to guide the power device from area to area and not to maintain the disk touching the work surface.

Abstract: A grinding disk for an electric hand power tool has a support plate, a foam material body arranged on the support plate and composed of flexible polyurethane, and a burdock-shaped fabric which is pulled over the foam material body on a body surface facing away from the supporting plate, for fixing of a grinding members, the supporting plate being composed of a massive, non-foamed, viscous hard, polyurethane resin, and the foam material body being composed of a polyurethane reaction mixture which connects the supporting plate with the burdock-shaped fabric.

Abstract: An attachment means for attaching a sheet-formed abrasive and/or polishing means to a magnetized support, said attachment means comprising a ferromagnetic base layer and an external adhesive layer to which the abrasive and/or polishing means attached, and where said ferromagnetic base layer comprises a ferromagnetic metal foil and that said attachment means comprises a liner sheet having a first side adhered to a first side of the base layer by means of an internal adhesive layer, the liner sheet having the external adhesive layer disposed on the second side of the liner, the external adhesive layer being capable of releasably fixating the abrasive and/or polishing means and said external adhesive layer being capable of substantially retaining its adhesive capacity after removal of the abrasive and/or polishing means. The base layer is optionally and preferably provided with a friction increasing layer on the second side.

Abstract: A surface treating article including a quick release fastener. The fastener includes a first end opposite the article, a second end adjacent the article, a tapered portion increasing in cross sectional area in the direction from the first end to the second end, a groove located between the tapered portion and the second end, and a mating portion having a non-circular cross section. Preferably, the mating portion has a hexagonal cross section. Also disclosed is a backup pad for use with the surface treating article. The backup pad includes an opening having a cross sectional area that corresponds to the cross-sectional area of the mating portion of the fastener. The backup pad also includes an o-ring in the opening to engage the groove in the fastener.

Abstract: A polishing system such as a chemical mechanical belt polisher includes a hydrostatic fluid bearing that supports polishing pads and incorporates one or more of the following novel aspects. One aspect uses compliant surfaces surrounding fluid inlets in an array of inlets to extend areas of elevated support pressure around the inlets. Another aspect modulates or reverses fluid flow in the bearing to reduce deviations in the time averaged support pressure and to induce vibrations in the polishing pads to improve polishing performance. Another aspect provides a hydrostatic bearing with a cavity having a lateral extent greater than that of an object being polished. The depth and bottom contour of cavity can be adjusted to provide nearly uniform support pressure across an area that is surrounded by a retaining ring support. Changing fluid pressure to the retaining ring support adjusts the fluid film thickness of the bearing.

Abstract: This invention provides an improved backup pad for an abrasive disk adapted to permit a view of surface as it is being ground which comprises a compressible pad and a relatively rigid support member laminated to the pad that has shorter radial dimensions than the pad in those portions of the circumference of the pad that are likely to snag an angled surface during grinding. The result is that abrasive disks borne on the pad are less likely to tear from such contact.

Abstract: A back-up pad for pad for supporting an abrasive article. A preferred embodiment of the invention provides a back-up pad having a dust collection groove, in which the engagement component for securing the abrasive article is attached to the dust collection groove surface.

Abstract: A polishing disc support comprising a body (1) in the form of a disc, the disc having two sides one of which has a center, a centering hole (4) being provided in said center and a drive hole (5) being provided in an eccentric position in this same side, wherein a coating (6) of a material which is softer than that of the body (1) is applied to the other side (3).

Abstract: Apparatus and method for both cleaning and polishing work surfaces such as automotive panels using a single combination pad. In one embodiment, a support holds a circular replaceable, disposable cleaning/polishing pad on a powered polishing tool for rotation about the pad's central axis. The illustrated pad is made of compressible/expandable material such as foam. The pad has front and rear recesses that define concentric radially outer and inner sections. The inner section is thinner and has a forward cleaning surface. The outer section normally protrudes forwardly of the cleaning surface so that when it is first brought into engagement with a work surface, the cleaning surface does not engage the work surface. A pressure-applying backup plate of a firm material such as neoprene has a forwardly displaced inner portion that is received in the pad rear recess for applying firm pressure to the pad cleaning surface. The plate has an outer portion for applying pressure to the outer pad section.

Abstract: A lapping assembly is described wherein a lapping process is performed to provide a flat headbox apron floor. The lapping assembly includes an eight-legged fly-style plate and a spring loaded floating driver. The lapping assembly and operation consists of attaching a spring loaded floating driver to a machine spindle of a milling machine. A lapping fly wheel is attached to the spring loaded floating driver. A coated abrasive strip with desired grit size to achieve the desired finished results is clamped in place on the lapping fly wheel. The machine spindle is rotated, thereby rotating the spring loaded floating driver and the lapping fly wheel, and the grinding and lapping of the apron floor can begin.

Abstract: A hard, sanding roller has a cylindrical sleeve that can be telescoped onto and removed from and clutched to a hard, supporting roller or drum This is achieved by a one-way, clutch mechanism between the supporting roller and abrasive sleeve that allows axially sliding and rotational turning when sliding the sleeve onto the roller and turning the sleeve in the non-sanding direction, and this clutch mechanism drives the sleeve without rotational turning of the sleeve relative to the roller when abrading. The inner surface of the abrading roller carries one-half of a clutch surface; and the mating roller surface carries the other half of the clutch surface.

Abstract: A dual function powered oscillating hand tool comprises a driven unit having an electric motor and a first drive shaft; an eccentric bearing mounted on the first drive shaft with a radial offset e relative to the first drive shaft; a second drive shaft mounted on the eccentric bearing and terminating in a flange and a drive spigot; a sanding shoe; and a location hole positioned on the backing face of the sanding shoe for location of the second drive shaft and means to restrict the random orbit of the sanding shoe to a regular orbit. The drive spigot has a diameter d.sub.1 adjacent to the flange face and a maximum diameter d.sub.2 at its free end and the location hole has a diameter d.sub.3 at the backing face and a diameter d.sub.4 at the face adjacent to the working face of the shoe, andd.sub.1 =d.sub.3 -c.sub.1d.sub.2 =d.sub.4 -c.sub.2 andd.sub.2 =d.sub.3 -(2e-c.sub.1)where c.sub.

Abstract: A sanding apparatus (1) has a sanding platen (2) to which motion is applied. The platen (2) has a flat surface (9) to which an abrasive sheet (22) is applied. The peripheral edge (3) of the platen (2) has a point (4) which can be used for detailed sanding. The surface (9) has a detachable portion (14) adjacent the point (4). The detachable portion (14) can be removed from the remainder of the platen (2) and rotated through 180.degree.. The abrasive sheet (22) can have an area corresponding to the detachable portion (14) of the surface (9) which is removable from the remainder of the abrasive sheet (22) by means of a perforated line (24).

Abstract: A burnisher for disassociating undesirable material from a work piece includes a wire and a burnishing medium operably associated with the wire. The flexibility of the burnisher permits forces to be generated to disassociate the burnishing medium.

Abstract: A method for making an abrasive article is disclosed, including the steps of providing a substrate having abrasive means on one surface, and providing a plurality of hooking stems on the opposite surface thereof. Several illustrative variations of the inventive method are disclosed.

Abstract: A laminated abrasive wheel comprises a central carrying member having two holding flanges between which abrasive laminae assembled to form stacks of abrasive laminae are arranged. On the holding flanges there are fastened respectively alternating studs which are pushed between the stacks of abrasive laminae and which serve to hold them under friction. At the same time, the holding flanges are also connected to the stacks of abrasive laminae to form a unit.

Abstract: A technique for mounting polishing pads to a platen in chemi-mechanical semiconductor wafer polishing apparatus is disclosed. A lower pad is mounted to the platen, and is trimmed to the size of the platen. An upper pad is mounted to the lower pad, and is sized so that an extreme outer edge portion of the upper pad extends beyond the trimmed outer edge of the lower pad. The outer edge portion of the upper pad is deformed downwardly, towards the lower pad. In this manner, polishing slurry is diverted from the pad-to-pad interface. Additionally, an integral annular lip can be formed on the front face of the upper pad, creating a reservoir for slurry to be retained on the face of the upper pad for enhancing residence time of the polishing slurry prior to the slurry washing over the face of the upper pad.

Abstract: The roller and belt assembly for mounting on a spindle or drive shaft comprises a closed loop belt having an inner surface and an outer surface, the inner surface having an engagable material thereon, and the outer surface having an abrasive or buffing material thereon. The assembly further includes a cylindrical roller having an outer cylindrical surface, having a longitudinal axis and having a resilient, compressible material attached to and covering the outer cylindrical surface. Sliding and engaging structure is attached to the resilient, compressible material which, when the belt is rotated in a first direction, allows the belt to slidingly rotate around and about the longitudinal axis of the roller and, when the belt is rotated in a second direction, the sliding and engaging structure engages the engagable material on the inner surface of the belt and prevents the belt from rotating about the roller.

Abstract: Buffing apparatus including a buffing assembly including a stack of buffing wheels with or without spacers between the rings, compressed under high pressure. Each wheel includes a clinch ring which in turn secures an annulus of fabric extending radially therefrom. Each spacer includes a ring; they may be the remnants of used buffing wheels. The wheels and spacers, if any, are contiguous forming an inner cylindrical surface of the rings. Steel straps extend axially along this inner surface, the straps being secured by metal inert-gas welding to the rings at the ends of the stack. The pressure between the buffing wheels and any spacers of the stacks is so high as to suppress any tendency of the wheels or spacers to slip circumferentially with respect to each other when the stack is under high tangential force in use. The straps serve to be engaged by the keys of a drive shaft to drive the buffing apparatus.

Abstract: A semi-conductor wafer polishing machine having a polishing pad assembly and a wafer holder includes a support positioned adjacent the polishing pad assembly. The support includes multiple fluid bearings that support the polishing pad assembly on the support. These fluid bearings are arranged concentrically to provide concentric regions of support for the polishing pad assembly, and each fluid bearing is coupled to a respective source of pressurized fluid at a respective pressure.

Abstract: A container assembly for a sharpening stone which can be converted from a package for transport and display into a pedestal for supporting and exposing the sharpening stone for use. The assembly is formed of a sheet of polymeric material having a plurality of panels joined by living hinges. A generally box-shaped package can be formed for containing the sharpening stone by folding the panels in one direction and joining end flaps and panels by the use of detents. A pedestal for exposing the sharpening stone can be formed by folding the respective panels on the assembly in the opposite direction and joining into a box-shaped configuration with the use of the end flaps, panels and detents.

Abstract: A sandpaper pad and a pad support of corresponding shape is provided for use with a detail sander. The sandpaper pad and pad support each has a substantially 90.degree. forward corner formed by a pair of facet edges. A pair of outwardly inclined straight side edges extend rearwardly from the facet edges on opposite sides of the pad center line each being outwardly inclined from the center line 10.degree.-30.degree.. When the straight side edges are in use, the forward corner is inwardly offset, thereby minimizing forward corner wear.

Abstract: An apparatus for sanding a work piece includes a motor, a motor housing, an essentially cylindrical sanding element assembly including a sanding element, a tubular sanding element assembly first support member extending from the motor housing to the sanding element assembly, and a drive train extending from the motor through the first support member to the sanding element assembly. The motor housing is preferably cylindrical and has a longitudinal axis, and the first support member extends essentially perpendicular to the housing longitudinal axis, and the cylindrical sanding element assembly also has a longitudinal axis which is essentially parallel to the housing longitudinal axis.