EP3487665A2

EP3487665A2 - Surface machining apparatus comprising a curved portion

Info

Publication number: EP3487665A2
Application number: EP17751659.8A
Authority: EP
Inventors: Frank SIEBERT; Guido PÖRTNER
Original assignee: Tts Microcell GmbH
Current assignee: Festool GmbH
Priority date: 2016-07-29
Filing date: 2017-07-21
Publication date: 2019-05-29
Anticipated expiration: 2037-07-21
Also published as: CN109715344B; EP3487665B1; CN109715344A; WO2018019736A2; US20210276154A1; WO2018019736A3; DE102016114096A1

Abstract

The invention relates to a surface machining apparatus (10), in particular a manual grinder, comprising a machining member (20) that has at least one machining surface (21-23) for grinding or polishing a workpiece surface (O); the machining member (20) includes a planar surface portion (26) with a planar machining surface (21) for machining planar workpiece surfaces (O) and at least one curved portion (27) with a curved machining surface (22-23) for machining curved workpiece surfaces (O). The curved portion (27) on said machining apparatus (10): - extends across a side of the machining member (20) that lies opposite the planar surface portion (26), - has a plurality of curved sections (31-36) which adjoin each other without interruption and each of which has a different radius of curvature (R1-R5), and - does not protrude beyond the planar machining surface (21-23) of the planar surface portion (26).

Description

Surface treatment device with a curvature section

The invention relates to a surface treatment device, in particular a manual grinder or polishing device, comprising a processing body having at least one processing surface for a grinding or polishing processing a workpiece surface, wherein the processing body has a planar surface area with a planar processing surface for machining planar workpiece surfaces and at least one curvature having a curved machining surface for machining curved workpiece surfaces.

Such processing devices are known, for example, as grinding blocks. The operator has the ability to work flat surfaces or workpieces on the basis of the flat working surface, while the curved working surface is optimally suited, for example, for grinding or polishing of narrow or round sections of the workpiece. However, as a rule, the curved machining surfaces are not suitable for any type of round workpieces or hollows. Furthermore, the curved processing surfaces are often very small area, which significantly limits the scope of such grinding blocks.

It is therefore the object of the present invention to provide an improved surface processing apparatus.

To achieve the object, it is provided in a surface treatment device of the type mentioned above that the curvature part extends over a side of the processing body which is opposite to the plane surface part, wherein the curvature part passes over several continuously Having curvature portions with mutually different radii of curvature and does not protrude in front of the planar processing surface of the plane surface portion.

It is a basic idea that several different radii of curvature and thus several differently configured geometries of the processing surfaces are available for workpiece machining. The continuous course of the curvature section advantageously makes it possible that no projecting or stepped edges preclude a clean and stepless machining of the workpiece surface.

Preferably, the curved portion has the course of a spiral or

Part-spiral.

Expediently, the curvature part has the course of a so-called fibonacci spiral.

However, the curvature part can also have the course of a logarithmic spiral, in particular the course of a so-called golden spiral.

It is preferred that the curvature part and the plane surface part at at least one transition region adjoin one another at an angle. The angled transition region may, for example, provide an edge with which the workpiece surface can be machined. However, the angular transition region can also be an area that is inactive or not intended for machining the workpiece surface, for example a region on which respective end regions or edges of an abrasive material are arranged. It is particularly advantageous if the angle is in a range of, for example, 90-45 °. The angular transition region can also be configured at an acute angle of, for example, 45-25 °.

Conveniently, a plurality of radii of curvature is provided. The largest radius of curvature of the curvature part is, for example, at least twice, preferably three times, in particular four times, as large as the smallest curvature radius of the curvature part. It is preferred that a curvature section of the curvature section has a larger radius of curvature at the at least one angled transition area than at least one further curvature section of the curvature section. For example, it is particularly preferred if a largest or the largest radius of curvature of the curvature part is provided at the at least one angular transition region.

It is understood that an angular transition region can be provided in each case at opposite end regions or transition regions from the plane surface part into the curvature part. However, an asymmetrical configuration is also possible, for example in connection with the following embodiment.

An advantageous concept provides that the curvature part tangentially transitions into the plane surface part at exactly one or at least one transition region. Thus, therefore, the curvature portion at one or more transition regions, so to speak, passes tangentially or continuously into the plane surface area. A rounding or curvature of the curvature begins directly from the plane surface part.

It is advantageously provided that a radius of curvature of a curvature section merging tangentially into the planar surface section is smaller than at least one further curvature radius of a curvature section of the curvature section, preferably of all further radii of curvature of the other curved sections of the curvature section. Thus, therefore, a particularly small radius of curvature or the smallest radius of curvature of the curved portion is provided in the tangential transition region between the plane surface portion and the curvature portion.

A respective transition region between the curvature part and the plane surface part is expediently provided on a longitudinal side region of the processing body. Ergonomically favorable and / or in the sense of optimal workpiece machining, it is, for example, when the curvature part projects laterally next to the plane surface part, for example, at least one side or exactly one side of the plane surface part.

However, it is advantageous if the curvature part does not project frontally or in the normal direction in front of the plane surface of the plane surface part, so that it is completely suitable for planar contact with the workpiece surface, without the curvature part being a hindrance.

For example, it is provided that no polishing agent or abrasive or no holding means for holding an abrasive or polishing agent is arranged on at least one, in particular an angular or angular, transition region between the plane surface portion and the curving portion. As already indicated above, the angular transition region can be used, for example, to allow an operator there, for example for an exchange, to grasp the abrasive or polishing agent particularly easily. Furthermore, it is favorable in some cases that, especially in the angular transition region, there is no surface suitable for workpiece machining, which could damage the workpiece surface, for example, if the processing device is not handled properly.

The following measure advantageously provides that the curved portion and the plane surface portion extend on mutually opposite sides of the machining body substantially over its entire transverse width. Thus, particularly large-area processing surfaces are present, namely, for example, on an upper side and a lower side of the processing device.

It is advantageous, for example, if the plane surface part extends over a part of the cross section of the processing body and the curvature part extends over all remaining regions of the cross section of the processing body. The surface treatment device thus provides the flat surface part on the one hand and the curvature part on the other regions on the other hand. It would be possible to lent also a configuration in which, for example, in addition to the flat surface area side wall sections or side parts are present, which in turn pass into the curvature section. Thus, for example, a basically cuboid, but provided with a curved portion machining body is possible.

A preferred concept provides that the curvature part adjoins opposite transverse end regions of the plane surface part. Thus, in each case a transition to the curvature part, for example the abovementioned angular transition region and / or the above-mentioned tangential transition region, is provided at both transverse end regions or lateral regions of the planar surface part.

Appropriately, it is provided that the processing body is wholly or at least partially configured as a cylinder and / or as a cone, on the lateral surface of the curved portion and the plane surface portion are provided. The cylindrical configuration has the advantage that the machining body over a longitudinal length or along a longitudinal axis has a continuous shape, that is, the large processing surfaces with over the longitudinal length or longitudinal axis of the same contours for workpiece machining are available. A cone has the advantage that, for example, the radii of curvature of the curvature part at one longitudinal end region of the cylinder are greater than at the other longitudinal end region. Thus, additional and narrower radii of curvature are available. It is understood that, for example, a conical section may be provided on a cylindrical portion of the processing body.

Also, a stepped configuration of the at least partially or partially conical and / or partially or section-wise cylindrical machining body is possible:

It is preferably provided that the machining body has at least one step or is designed as a step body. For example, a plurality, for example at least two, cylindrical sections with respect to a Longitudinal axis of the processing body to be arranged side by side. For example, a conical section may also be connected to these cylindrical sections or a cylindrical section.

At this point it should be mentioned that the machining body preferably has over its entire longitudinal length, the outer contour of the invention or sheath contour. However, it is also possible for the machining body to have the above-described planar surface section and curvature section over a partial section, while another partial section is designed, for example, as a cuboid or circular cylinder or with another other circumferential geometry or geometry of machining surfaces.

An advantageous concept provides that the machining body in the region of the curvature part has the profile of the upper side of a wing, on the underside of which the plane surface part is arranged. The top-side profile thus has a curvature course, which extends on one side arcuately to the planar surface area out, opposite but angularly and shallow expires.

It is preferred if a length of the machining body is greater than a transverse width and / or a transverse height of the machining body, with the curved portion and the planar surface portion extending over the respective length of the machining body. The processing body thus has an elongated shape.

It is also expedient if a transverse width of the plane surface portion is greater than a height of the processing body, so that the processing body has a flat shape.

The processing body is suitably elastic. Preferably, it comprises or is made of a foam material. There is also the possibility that the machining body has a relatively hard core, for example by arranging there an air guide body or air guide body, which acts as a stiffener. On the relatively hard core, the elastic and / or consisting of foam material material may be arranged, so anyway the preferred embodiment is achieved, which looks like this. Preferably, a foam material or an elastic, resilient material is provided at least in the region of the at least one processing surface. The foam material preferably contains or is polyurethane foam.

The surface treatment device expediently has an abrasive and / or polishing agent on the planar processing surface and / or the curved portion.

A polishing agent or abrasive may be or include, for example, a grain or grain structure. The polishing agent or abrasive may also be a knit, e.g. a grinding knit, or an abrasive cloth or polishing cloth or include.

It is possible for different abrasives or polishing agents to be arranged in different zones of the processing surface, for example the curved processing surface and the planar processing surface. For example, it is conceivable that the curved part has an abrasive and the plane surface part has a polishing agent. But it is also possible that the curvature part has two mutually different abrasives or polishing agents. Also, in the planar surface portion, it is possible that they include not only an abrasive or a polishing agent but at least two mutually different abrasives, e.g. Abrasive with different grain size, different grain material or the like, or at least two mutually different polishing, for example, different hard and / or dense polishing fabric has.

It is possible for the machining body to have an integral abrasive or polishing agent, that is, for example, an abrasive grain, a grinding knit, a polishing cloth or another polishing material or the like is arranged in the region of the at least one machining surface. If the processing body is worn, it is replaced. In the sense of favorable consumption or sustainability, the following measure is advantageous: It is expedient if holding means, for example an adhesive layer, a hook and loop or the like, are provided on the outer circumference of the processing body or of the at least one processing surface, for example an abrasive or polishing agent, for example Abrasive sheet, a Schleifgewirke or the like to keep.

The abrasive means or polishing means which can be detachably or firmly arranged on the machining body by means of the holding means or arranged have expediently a sheet-like shape. In particular, the abrasive or polishing agent is an abrasive sheet or polishing sheet.

An abrasive or polishing agent which can be detachably arranged or arranged on the machining body expediently forms part of a system which has the machining body and the abrasive and / or the polishing agent.

It is preferred if the plane surface portion and / or the portion of curvature uninterrupted or continuously have an abrasive and / or polishing agent. In the flat surface portion and / or the curved portion, it is also advantageous if it has continuous holding means, in particular a Velcro layer, for holding an abrasive or polishing agent. For example, therefore, no portion is provided on the flat surface portion or the curving portion, which has no abrasive or polishing agent.

In particular, transitions between portions or end portions of the polishing agent or abrasive, whether integrally disposed directly on the machining body or configured as a replaceable component, are provided only at a transition region between the planar surface portion and the arcuate portion. For example, no edge of a sanding sheet is arranged on the flat surface part or the curving part.

Although the illustrated concept is preferably applied to a manual surface treatment device. But it is also possible that a machine Nelles surface processing device is designed according to the invention. For example, a drive, in particular an electric or pneumatic drive motor with a corresponding transmission gear, be provided for driving the processing body to rotary and / or eccentric and / or hypercycloid and / or oscillatory movements. For example, the drive is arranged in a machine housing on which the processing body is arranged.

In the manual processing device is advantageous if it has, for example, a handle on which the processing body is arranged. Preferably, the handle is arranged on a suction connection or has a suction connection for sucking off dust from the at least one processing surface.

A preferred concept provides active dust extraction. Advantageously, it is provided that inflow openings for sucking dust laden with dust are arranged on the at least one processing surface, which are flow-connected via a channel arrangement to a suction connection to which a suction device can be connected. Thus, dust generated on one or more of the processing surfaces can be effectively extracted.

Particularly preferred is the following, representing a self-contained invention concept in conjunction with the measure described in the paragraph above and the preamble of claim 1, wherein it is provided that the processing unit has an adjusting device for adjusting effective flow cross-sections, with which inflow of a first machining surface section of the at least one machining surface and inlet openings of at least one second machining surface section of the at least one machining surface are flow-connected to the suction port, so that a suction effect on the first machining surface and the at least one second machining surface can be adjusted and / or switched off. As a result, the suction power of the suction device is not lost on unused working surfaces or machining parts, but is there Used effectively where you need it. Thus, it is possible, for example, to provide the suction only on the plane surface part or only on the curving part. Even the plane surface part and / or the curvature part can be subdivided with respect to the suction, so that, for example, partial regions of the planar surface part or the curving part can be brought into fluid communication with the suction connection by means of the adjusting device, while other partial regions are not sucked off or to a lesser extent. Thus, for example, an extraction in the region of larger radii of curvature and in the region of smaller radii of curvature of the curvature section can optionally be set in the area of curvature.

Thus, for example, the inflow of foreign air to an unnecessary working surface or currently not engaged or in contact with the workpiece processing surface can be prevented or limited. The suction capacity of the active working surface is thereby higher. Furthermore, any unpleasant in the workpiece machining air flow that would flow through a non-engaging with the workpiece processing surface is prevented or reduced.

The two first and at least one second machining surface parts, for example the plane surface part and the curvature part and / or components of a curvature part, can also have mutually angular or curved machining surface sections or machining surface parts. A region of machining surfaces can thus be understood as a first machining surface section of the at least one machining surface and at least one second machining surface section of the at least one machining surface.

It is preferably provided that the first and the at least one second machining surface section are arranged on mutually angled sides of an outer circumference of the machining body. Inter-angular machining surfaces or machining-surface parts include or are expediently also those machining surfaces in which, for example, a machining surface is a flat surface, the other processing surface is arcuate away from the planar processing surface.

It is also possible for the first and the at least one second machining surface section to be arranged on mutually opposite sides of the machining body.

In this context, it should only be mentioned in addition that a plurality of processing surfaces or processing surface parts may be present, for example, three or four processing surfaces or processing surface parts that are angled to each other. Furthermore, mutually angular machining surfaces or machining surface parts can also be provided on opposite sides of the machining body.

It is possible that the suction power is variably adjustable by means of the adjusting device, so that, for example, the suction flow, which flows over the first processing surface to the suction suction, is smaller or larger than that which flows to the suction via the at least one second processing surface.

Advantageously, it is provided that the adjusting device is designed to reduce the effective flow cross section between the suction connection and the first machining surface in favor of increasing the effective flow cross section between the suction connection and the at least one second machining surface.

An expedient embodiment provides that the adjusting device is configured to switch over a flow connection between the suction connection and the inflow openings of the first processing surface and the inflow openings of the at least one second processing surface such that either the inflow openings of the first processing surface or the inflow openings of the at least one second processing surface are connected to the suction. Thus, for example, the suction flow can be switched off at the one processing surface while he flows over or through the other processing surface. If a plurality of processing surfaces, in particular on mutually opposite or mutually angled sides of the processing body provided processing surfaces, are provided, it is possible, for example, a working surface to suck, while the other processing surfaces are switched off in terms of the suction, so to speak. No suction flow then flows to the suction connection via its inlet openings.

Also, combinations are readily possible, i. that the flow connection between the inflow openings of a first processing surface area and the suction connection is switched off or inhibited by means of the adjusting device, while in a second processing surface area a full suction flow or a virtually unobstructed flow connection between the inlet openings and the suction connection is present and finally at the inflow openings of a third processing surface section relative to the inlet openings of the second processing surface area lower suction flow flows. Thus, therefore, the suction at the second processing surface area is maximum, reduced at the third processing surface and not present at the first processing area. This application example is also readily possible for further, for example, more than three processing surfaces.

It is preferably provided that the processing device has latching means and / or a locking device for latching or locking the adjusting device in at least one setting position and / or in all setting positions in which the suction connection is flow-connected to only one of the processing surfaces. Thus, the suction power can be switched, for example, digitally between the processing surfaces or processing surface lots. The flow connection to the suction connection is always present only at a machining surface area or processing surface. However, latching or locking or a combination thereof is also possible in the case of further setting positions, for example as in the above exemplary embodiment, in which, for example, not just a suction flow over the inlet flow openings of a processing surface can flow, but also at least partially or to a lesser extent via the inlet openings of a further processing surface.

It should be mentioned that also clamping means or the like other fixing means for fixing the adjusting device can be provided in at least one setting position.

It is expediently provided that the adjusting device has a manually operable adjusting element, in particular an adjusting ring or an adjusting sleeve, for adjusting the effective flow cross-sections. Thus, the adjusting device is manually operable. Without further thought, however, would also be an electrical or other motor drive variant, in which, for example, an actuator, in particular an electromagnet, a stepper motor or the like, actuates the adjusting device.

An advantageous concept provides that the adjusting element is coupled or fixedly connected to a mask body or has a mask body, wherein the mask body is arranged between the inlet openings of the processing surface parts and the suction connection and has a passage section having at least one passage opening and at least one reducing section, which has a Closing surface for closing a flow connection between the inlet openings of at least one processing surface area and the suction port or with a smaller effective flow area than the passage section is permeable to air. The mask body is for the positioning of the passage portion or the at least one reducing portion between the suction port and the inlet openings of a respective machining surface area based on a bearing, in particular a pivot bearing, with respect to the processing body movable, in particular rotatably mounted. But without further ado would be a sliding bearing or a combination of sliding bearing and pivot bearing possible. The at least one reducing section can therefore be completely closed, ie a flow connection between the machining surface section or Processing surface, which he is assigned in a respective setting position of the adjusting device, and prevent the suction connection. It is also possible for the at least one reducing section to reduce a flow connection between the machining surface area or the machining surface to which it is currently assigned according to the respective setting position of the adjusting device. The flow cross section of the reducing section which can be flowed through by the suction flow is smaller than a flow cross section of the passage section which can be flowed through by the suction flow.

The mask body may also be referred to as a valve body or a valve body.

It is also advantageous if the mask body is flow-permeable only at the passage section. In this case, the mask body or valve body is closed except for the passage portion. This is advantageous, for example, in the case of a digital changeover such that only a first processing surface is sucked off.

It can also be provided that the mask body forms part of a mask arrangement whose masks are adjustable relative to one another, in particular rotatable, in order to adjust an effective flow cross section for the dust air between the inlet openings of a respective processing surface and the suction connection. For example, mask body or valve body may be provided, which are designed like a disk and are rotatable and / or slidably mounted relative to each other. But would also be possible a combination of drum-like or sleeve-like mask body or valve body, which are for example displaceable relative to each other or rotatable or both stored. By the relative adjustment of the mask body or valve body, it is possible that passage openings or flow openings of the two mask body or valve body are adjustable in different relative positions to each other in which they are aligned with each other and then provide a maximum flow cross-section or relative to each other so adjustable or adjusted, that, for example, a closed surface or wall surface of a mask body or valve body completely or at least partially covers a passage opening of the other mask body or valve body, so that the flow cross section of this covered passage opening is closed or reduced.

An advantageous measure provides that extends along a longitudinal axis of the machining body at least one suction channel, the flow connection with the suction and with the inlet openings of at least one of the first processing surface area or the at least one second processing surface area on the basis of transverse channels or a flow-permeable structure , The air flow can flow from the inflow openings to the suction connection via the suction channel, which is elongated as it were. One or more such suction channels can be provided. It is understood that all suction channels can extend over the entire longitudinal length of a processing body. But it is also possible that extends or extend only over a part of a longitudinal length of the processing body one or more suction ducts. A length of a suction channel is preferably configured in such a way that it extends from the respective machining surface section to be sucked off substantially to the suction connection.

A suction channel can for example also serve as a valve body or valve seat, in particular in the embodiment which will be explained below

The at least one suction channel has e.g. Through openings, which are fluidly connected to the inlet openings of the machining surface lots. But it is also possible that the suction channel has a porous structure or in any other way at least partially permeable to air, so that inflowing air can flow into the suction through the inlet openings.

It is expediently provided that in the at least one suction channel a particularly tubular and / or rod-shaped air guiding body, for example in the form of a mask body or valve body, as described above. written rotatable about a longitudinal axis extending along the axis of rotation and / or is slidably mounted along a sliding axis.

The air guide body advantageously has on its outer circumference at least one flow opening, which is flow-connected to a flow channel which extends along the longitudinal axis and is flow-connected to the suction, so that by adjusting the air guide body in the suction the at least one flow opening of the air guide body relative to the inlet openings and / or to at least one communicating with the inlet openings of at least one machining surface section passage opening of the suction channel for changing the effective flow cross-section of the inlet openings with respect to the suction is adjustable.

The at least one suction channel is, for example, a stationary mask body or valve body relative to the processing body, relative to which the movable mask body or valve body is movably mounted in the form of the air guiding body. For example, both mask body or valve body are tubular or sleeve-shaped.

It is possible that with separate suction ducts in each suction or multiple suction ducts such air guide body are arranged.

It is preferably provided that the suction channel comprises a suction channel body, in which the air guide body is rotatably and / or displaceably mounted.

The air guide body, in particular the mask body or valve body, advantageously has at least one or at least one flow opening, in particular a series arrangement of throughflow openings arranged side by side on a first angular segment region or longitudinal region of its outer periphery, and no flow openings at at least one second angular segment region or longitudinal region or through flow openings having a smaller flow area than at the first angle segment area, wherein the flow openings are fluidly connected to the flow channel, which extends along the longitudinal axis and is flow-connected to the suction port. By rotating and / or moving the air guide body, the first angular segment region or the at least one second angular segment region or the first longitudinal region and the first longitudinal region with the inflow openings of the first processing surface area or the at least one second processing surface area in flow communication for adjusting the effective flow cross section between the suction port and the respective processing surface can be brought.

It is possible a configuration in which the air guide body is mounted longitudinally displaceable in the suction, wherein through a longitudinal displacement or relative displacement of the air guide body in the suction throughflow openings of the air guide body, which communicate with the flow channel, with flow openings of the suction, with the inlet openings of a respective processing surface or Bearbeitungsflächenpartie connected in flow, can be made in alignment, so that the exhaust air can flow through the inlet openings of the processing surface or machining surface and the throughflow openings of the suction passage into the flow channel of the air guide body. However, the flow-through openings of the air-guiding body can also be adjusted away from the flow-through openings of the suction channel, so that the flow-through openings of the suction channel are at least partially covered and thus no suction air can flow into the flow channel of the air-guiding body through the inflow openings of the associated processing surface or machining surface section.

It is also expedient if the air guiding body has on its outer circumference extending in the longitudinal direction and at least one angular segment region delimiting sealing contours, in particular sealing projections or sealing ribs, which bear against an inner circumference of the suction channel. However, it can also be a longitudinal region separated by at least one sealing contour of another longitudinal region, wherein the sealing contour then in the circumferential direction extends. Thus, therefore, for example, a tubular or sleeve-shaped air guide body can be provided with radially outwardly projecting ribs or sealing contours rotatable in a suction channel. However, the ribs or sealing contours need not rest against the inner circumference of the suction channel surface or sealing, but can also be provided with a certain play, so that the air guide body is easier to rotate or move.

A suction channel is advantageously provided for each processing surface, which extends along the longitudinal axis of the processing body and is flow-connected to the inlet openings of the respective processing surface. For this purpose, for example, several suction channels as bores, channel bodies or the like may be arranged in the processing body. But it is also possible that in a single flow body, for example, tubular body, angle segments or cross-sectional segments are divided, in each of which a suction channel is formed. Thus, for example, in such a flow body, which can also be seen in the drawing, partitions or partitions may be provided which separate the suction channels from each other.

The mask body or valve body is expediently arranged between the suction connection and the suction channels.

The mask body is advantageously movable for positioning the passage section and the at least one reducing section between a respective suction channel and the suction connection on the basis of the bearing, in particular rotatable and / or displaceable, mounted.

Thus, it is possible, for example, for the mask or the valve body to be arranged between the suction connection and the individual suction channels, for example at the end of the suction channels, and for this purpose to be mounted in a relatively adjustable manner, for example rotatably mounted and / or displaceably mounted, around a respective suction channel to close, so to speak, or to release its flow cross-section. Without further ado it is also possible that one respective suction channel is only partially closed, so that its flow cross-section is reduced to Absauganschluss out.

Advantageously, it is provided that a connecting element of the suction connection for connecting a suction hose is rotatably mounted to the machining body, wherein advantageously the machining body and the suction hose without an adjustment of the adjusting device are rotatable relative to each other. The connecting element is expediently sleeve-shaped or comprises a sleeve. In this way, a rotational decoupling of the suction hose is possible relative to the processing body, which among other things facilitates handling. But even an unintentional, possibly caused by the suction hose adjustment of the adjusting device is easily avoided by a rotary decoupling.

It is expediently provided that an inlet channel arrangement which is open at the side to the processing surface and is flow-connected to the suction connection by means of at least one of the inlet openings or the inlet openings is arranged on the at least one machining surface or machining area. In particular, a labyrinth is provided or a tree-like structure of inlet channels or an inlet channel arrangement is provided. Advantageously, the inlet duct arrangement comprises at least two, preferably a plurality of branched inlet ducts, which are at least partially open, so that exhaust air can reach an inflow opening via the inlet ducts.

Hereinafter, embodiments of the invention will be explained with reference to the drawing. Show it:

FIG. 1 is an oblique perspective view of a surface treatment device;

FIG. 2 shows a perspective oblique view of an abrasive for the processing device according to FIG. 1, an exploded view of an adjusting device for setting a suction effect in the processing apparatus according to the above figures, a frontal view of a processing body of the processing device according to the above figures to illustrate its outer peripheral contour, which is in a cross-section shown in FIG along a section line AA in Figure 1, a longitudinal section through 1, along a section line AA in FIG. 1, a detail D1 from FIG. 6, a side view of an alternative adjusting device for setting a suction effect in the processing device according to the preceding figures, a longitudinal section through the adjusting device according to FIG. 8, along a section line CC 9, an exploded view of the adjusting device according to FIGS. 8-10, a mask body of the adjusting device according to FIG. 11 in a perspective oblique view, an a Alternative processing body as well as an adjusting device with a functional principle similar to the adjusting device according to FIGS. 8-12, wherein the machining body has separate, tubular suction channels from one another,

14 shows the processing body and the adjusting device according to FIG. 13, but in a different setting position of the adjusting device, FIG.

Figure 15 shows the arrangement according to Figure 13, 14, wherein the adjusting device is further adjusted, and

FIG. 16 shows a processing body designed as a step body.

A processing apparatus 10 comprises a processing body 20, on whose outer circumference a plurality of processing surfaces 21, 22 and 23 are provided. On the basis of the working surfaces 21-23, a schematically indicated workpiece W can be machined on its workpiece surface O, for example ground and / or polished. The machining surfaces 21-23 extend on an outer periphery 24 of the generally cylindrical machining body 20. The machining body 20 has a longitudinal shape and extends along a longitudinal or longitudinal axis L.

The processing surface 21 is provided as a plane surface 25 or flat surface, with which a correspondingly planar workpiece surface O can be optimally processed. The machining surface 21 or plane surface 25 is provided on a machining surface portion 28, which is designed on the basis of the plane surface 25 as a plane surface portion 26.

The working surfaces 22 and 23, on the other hand, are curved working surfaces and are provided on working surface parts 29, 30 which form components of a curvature part 27.

The working surfaces 21-23 merge into each other continuously so that they can also be referred to as a single working surface. The distinction between working surfaces 21-23 is intended in particular to clarify the assignment to the working surface parts 28-30. In any case, the curved machining surfaces 22-23 form, in principle, a single machining surface, which, however, has different radii of curvature and thus different geometric properties, which will become clear below.

The curvature portion 27 has a plurality of continuously merging into each other curvature sections 31, 32, 33, 34, 35, 36, the different radii of curvature, for example, radii of curvature R1, R2, R3, R4, R5, have. The curvature sections 31 to 36 merge into one another continuously, that is to say that in the end there are also other radii of curvature which are not specified here in detail. It is possible that, for example, the curvature part 27, starting from the radius of curvature R1, has a multiplicity of radii of curvature not explained in detail up to the radius of curvature R5.

The plane surface part 26 merges tangentially into the curvature part 27 at a transition region 37 shown on the right in FIGS. 4 and 5. There is the smallest radius of curvature R1 available. The curvature part 27 protrudes laterally in front of the plane surface part 26 in the transition region 37. However, the curvature part 27 does not protrude in front of the plane surface 25 frontally and or in the normal direction. A flat contact of the plane surface 25 on the workpiece surface O is therefore possible without being affected by the curvature part 27. The narrow radius of curvature R1, however, allows the processing of correspondingly curved or narrow portions of the workpiece surface O.

The radius R5 is in contrast to the radius R1 significantly larger, for example, at least twice as large or three times, preferably about four times as large as the radius R1, so that the curved portion 27 to a transition region 38, where the curved portion 27 at an angle to the flat surface portion 26 adjacent, runs relatively flat, for example, with an angle of less than 90 °, preferably 80-70 °. The transition region 38 and the transition region 37 are provided on opposite sides of the plane surface portion 26 and extend along the longitudinal axis L. Overall, the processing body 20 has a cylindrical, wing-like shape, the bottom of the "wing" as opposed to a real wing is flat or flat, so has no concave or convex curvature.The top of this wing extends convexly over the plane surface 25 and is at the transition region 37 round, while at the transition region 38 at an angle with respect to the plane surface 25 expires.

A transverse width B1 of the planar surface 25 or the planar surface portion 26 is almost as large as a transverse width B2 of the curved portion 27, so that the surface of the curved portion 27 and the plane surface 25 which are effectively usable for workpiece machining are similarly large.

However, the usable surface of the curvature part 27 is greater insofar as the transverse width B2 is greater than the transverse width B1 and the curvature part 27 also extends convexly over the plane surface part 26, so to speak bulges. Namely, the processing body 20 has a height H, over which the curving portion 27 bulges over the plane surface portion 26.

The height H is expediently about half as large as the transverse width B1 or B2.

Overall, this is a compact, handy and thus manually easily handled processing body 20 given.

The angular transition region 38 is not provided in the embodiment for workpiece machining. In principle, this would be readily possible, for example, if there is a corresponding polishing agent or abrasive present.

In the present embodiment, however, it is provided that a base material or base material 39 of the processing body 20 in the transition region 38 is exposed, ie no polishing agent or abrasive is provided and also no adhesive or holding means 40, which otherwise extends beyond the outer periphery 24 of the processing body 20. The base material 39 is, for example, example, a polyurethane foam or other elastic material. The adhesive or holding means 40 includes, for example, a Velcro layer, adhesive layer or the like.

The transition region 38, which is provided without holding means 40, has a grip zone or gripping regions 41 on which an abraded abrasive 120 in the form of a sanding sheet can be comfortably grasped and thus removed from the machining body 20.

The relatively soft processing body 20 is at its end faces, so to speak, the cylinder base surfaces covered by covers 42, 43 and thus protected. The covers 42, 43 are preferably harder than the base material 39, for example of a thermoplastic material. The covers 42, 43 include, for example, cover plates or are designed as such. The covers 42, 43 may be adhered to the foam material of the processing body 20.

The abrasive 120 has holding means 140, for example a Velcro layer or hooks, which cooperate with the holding means 40 of the processing body 20 in the sense of a solid, suitable for a surface treatment of the workpiece W neck. In other words, therefore, the abrasive 120 on the outer circumference 24 of the processing body 20 by means of the holding means 140, 40 releasably secured. This is known per se. At one of the holding means 140 having the opposite side of the abrasive 120 is a

Abrasive material 124, for example, a grinding knitted fabric, a grain or the like provided, with which the workpiece surface O can be treated in terms of abrasive machining or grinding processing.

Alternatively, of course, would also be possible that on the outer circumference 24 of the machining body 20 directly an abrasive, polishing or the like is arranged, for example, the abrasive material 124th

When the abrasive 120 is disposed on the processing body 20 (not shown, it takes the shape of the outer circumference indicated schematically in FIG. beginning 24 of the processing body 20 at. The abrasive 120 thus has a processing surface 121 and processing surfaces 122, 123 which rest against the processing surfaces 21, 22, 23 of the processing body 20. The processing surface 121 forms a plane surface 125 and thus a plane surface portion 126, while the other processing surfaces 122, 123 form components of a curvature portion 127, corresponding to the curvature portion 27 of the processing body 20.

The abrasive 120 has side edges 141 which come to rest on the gripping areas 41 in the state of the abrasive disposed on the processing body 20. There, the abrasive 120 can thus be comfortably grasped and subtracted from the processing body 20 so to speak, wherein the holding means 40, 140 separate from each other.

Furthermore, inflow openings 150, 151, 152 are provided on the processing surfaces 121, 122, 123, through which dust can be sucked off, which is formed, for example, during abrasive machining of the workpiece surface O based on the abrasive material 124.

The inflow openings 150-152 are made, for example, in the manner of holes, Ausstandzungen or the like.

In mounted on the processing body 20 or arranged state of

Abrasive 120 communicate the inflow openings 150-152 with inflow openings 50, 51 and 52 on the processing surfaces 21, 22, 23, thus with inflow openings 50, 51 and 52, which are provided on the processing surface portions 28-30.

The inflow openings 50, 51, 52 have for example angular distances with angles W1 and W2, which are preferably the same. Thus, a dust extraction at mutually angled sides of the processing body 20, namely with angular intervals W1 and W2, possible. The inflow openings 50, 51, 52 are flow-connected to an inlet channel arrangement 53, whose inlet channels 54, 55, 56 are open to the respective processing surface 21, 22, 23. The inlet passages 54-56 are exemplified and stand for a plurality of inlet passages branching away from the inlet ports 50-52. Above a respective inlet channel 54-56, one or more of the inlet openings 150-152 of the abrasive 120 are arranged, so that dust-laden air through the respective inflow opening 150-152 into the inlet channels 54-56 and from there into the inlet openings 50,51 and 52 can flow. Thus, in each case one inlet opening 50-52 is not provided for each of the inlet openings 150-152. Rather, dust air can flow through a plurality of inlet openings 150-152 and via the inlet channels 54-56 to the inlet openings 50-52. Furthermore, it is possible that an inlet channel 54, 55 or 56 communicates with or communicates with a plurality of the inlet openings 50 or 51 or 52, which is indicated by the example of the flow channel 55 in FIG. In any case, it is ensured that a dust extraction is provided in each case from a plurality of inlet openings 150-152 of the abrasive 120.

In use of the processing apparatus 10, the processing body 20 is usually only partially engaged with the workpiece W. For example, only one of the processing lots 28, 29 or 30 is effectively used while the other processing lots are not used. Namely, the operator will select the machining section 28, 29, 30 which is best adapted to the respective surface geometry of the workpiece surface O or which enables optimum grinding or polishing machining. The problem with this is that dust extraction would not only take place at the respectively used processing section 28, 29, 30, but also air would flow over the unused processing section 28 or 29 or 30, so to speak would flow false air. Here are the measures described below effectively remedy:

By means of an adjusting device 60, 260, 360, the dust extraction is effectively adjustable. The adjusting device 60 is shown in the processing apparatus 10 as shown in FIG. The adjusting devices 260, 320 have processing bodies 220, 320, which in terms of their basic external design, for example, the outer circumference 24, the machining surface parts 28-30 and the like are constructed the same, so far as not be explained in more detail. However, the flow concept and the setting of the same for the suction flow are designed differently. The adjustment means 60, 260, 360 make it possible to switch the suction between the inlet openings 50, 51 and 52 and to influence in advantageous embodiments, the suction or the effective for the inflow openings 50, 51 and 52 provided flow cross-section for the suction.

The inflow openings 50, 51 and 52 are flow-connected via a channel arrangement 57 and the adjustment devices 60, 260, 360 to a suction connection 11. The suction connection 1 1 comprises, for example, a connecting element 12, in particular in the manner of a connecting piece, to which a suction hose SL can be connected, which leads to a suction device AB. The suction device AB comprises, for example, a mobile vacuum cleaner or a stationary central dust extraction system.

It should be mentioned at this point that in the case of a processing device according to the invention it is of course also possible for dust to be present on board the processing device. For example, it is possible that a dust collector is connected to the suction port 1 1. Preferably, this is then associated with or upstream of a fan or other flow generator for generating a suction flow, which in the embodiment so the inflow openings 50 or 51 or 52, can flow via the inflow, which are associated with the processing surfaces, in particular a respective processing surface area.

The connection element 12 comprises, for example, a connection section 13 for attaching or inserting the suction hose SL. At the connection section 13 is preferably provided a ribbing. The connection element 13 furthermore has a connection section 14, which is provided for the rotatable connection with the components of the adjustment device 60 explained further below.

The channel arrangement 57 comprises transverse channels 58, which lead inwardly from the inflow openings 50, 51, 52 in the processing body 20, 220, 320 and open at the processing body 20 via passage openings 68 into a central suction channel 45, at the processing body 220 into separate suction channels 245, 246, 247 and the processing body 320 in separate suction channels 345, 346, 347th

The suction channels 45, 245, 246, 247 and 345, 346, 347 extend along the longitudinal axis L, the processing body 20, 220, 320 preferably over the entire or almost the entire longitudinal length of the processing body 20, 220, 320. For example, they are frontal closed by the covers 42, wherein another closure would also be possible.

The suction channel 45 is provided in a suction channel body 65 having a tubular shape. The Absaugkanalkörper has, for example, a peripheral wall 66, which is designed rohrformig. The peripheral wall 66 or the suction channel body 65 is expediently provided with ribs 67, which improve the hold in the base material 39 of the processing body 20. For example, the suction channel body 65 is foamed with the base material 39. On the front side, the suction channel body 65 may be closed by the cover 42, but also by a bottom, which is integrally formed on the Absaugkanalkörper 45. The cover 42 has, for example, a closure projection 42a which can be inserted into the suction channel body 65 or a cavity of the processing body 20 having the suction channel body 65.

On the peripheral wall 66 further passage openings 68 are provided, which are fluidly connected to the transverse channels 58, in particular aligned. Thus, dust air through the inlet openings 50-52 and the transverse channels 58 and Finally, the passages 68 flow to enter the suction channel 45.

At the suction port 1 1 side facing the Absaugkanalkörper 55 has a connection portion 69, for example, a connection sleeve 70. At the connecting portion 69, which is connected to the peripheral wall 66 or an extension thereof, is preferably a screw thread 71, in particular an internal thread, intended. Alternatively, however, a contact surface could also be provided for gluing or latching or the like.

In the Absaugkanalkörper 65, the suction channel 45 extends and terminates at the connection portion 69 from the Absaugkanalkörper 65.

With the connection portion 69, a connection element 73 is connected, for example screwed. The connection element 73 comprises, for example, a tubular or sleeve-shaped connection body 74, which has a screw thread 75 at a connection section. The screw thread 75 is screwed into the screw thread 71 of the suction channel body 65 so as to provide a substantially airtight connection.

The connection body 74 penetrates, for example, a passage opening 44 of the cover 42.

Between a front side 76 of the connecting body 74 and the bottom of a receptacle 72 of the connecting portion 69, in which the screw thread 71 is arranged, a gap 77 is provided.

The connecting element 73 has a bearing receptacle 78 into which an adjusting element 80 engages and in which the adjusting element 80 is rotatably mounted. A rotation axis D of the adjusting element 80 with respect to the bearing receptacle 78 corresponds for example to the longitudinal axis L. The connecting element 73 and the adjusting element 80 together form bearing elements of a pivot bearing. The Einstellelennent 80 has a channel body 81 which protrudes from a control portion 82 of the adjusting member 80 to Absaugkanalkörper 65 out. The adjusting section 82 has, for example, a receptacle 83 into which the connecting element 12 engages with the connecting section 14. The receptacle 83 forms a pivot bearing receptacle, in which the connecting portion 14 is rotatably mounted, so that a rotational decoupling between the connecting element 12 or the suction port 1 1 on the one hand and the processing body 20 and / or the adjusting device 60 is provided.

Preferably, a holding projection 84, for example a ring-shaped or part-annular rib projecting radially inwardly and located in the receptacle 83, engages in a corresponding recess 15 on the connecting section 14 of the connecting element 12. On the basis of the retaining projection 84 and the recess 15, the connecting element 12 with respect to its axis of rotation about which it can rotate relative to the receptacle 83, determined tensile strength. The axis of rotation corresponds here to the longitudinal axis L or is parallel to the longitudinal axis L.

It is expedient if the connection element 12 rests with a flange projection 16 on an end face 85 of the adjusting element 80. It is also advantageous if one end face of the connection element 12 or of the connection section 14 is supported on the bottom of the receptacle 83.

Due to the rotational mounting on the one hand of the connecting element 12 on the adjusting element 80 and on the other hand, of the adjusting element 80 with respect to the machining body 20 and the connecting element 73, the adjusting element 80 can rotate freely between the suction hose SL and the machining body 20.

The adjusting element 80 is held on the connecting element 73 by means of a latching tensile strength with respect to the longitudinal axis L or its axis of rotation D relative to the connecting element 73. For example, hook hooks 86 are provided on the adjusting element 80 and project in front of the adjusting section 82. The hook projections 86 have hooked noses 87, which are inserted into the intermediate space 77. engage, so that the adjustment member 80 on the connecting element 73 zugfest fixed with respect to the longitudinal axis L of the axis of rotation D with respect to the connecting element 73 by this rear handle. The hook projections 86 have spacings in the circumferential direction relative to one another, so that they are movable radially in this respect in order to lock in the bearing receptacle 78. Thus, therefore, the adjusting element 80 can be inserted and latched into the bearing receptacle 78 along the longitudinal axis L or the axis of rotation D. The assembly is easy.

Fixing means 88 are preferably provided, in particular a latching device or latching means. The fixing means 88 comprise, for example, latching noses 89, which protrude radially outward in front of the hook projections 86 and engage in corresponding latching recesses 79 of the connection element 73. The latching recesses 79 are provided, for example, on an inner circumference of the bearing receptacle 78.

With the adjusting member 80, in particular the channel body 81, an air guide body 90 is rotatably connected. For example, the channel body 81 is inserted into the air guide body 90 and glued in the region of a connecting portion 81 A with this, locked, pressed or the like otherwise firmly connected. Thus, when the adjusting member 80 is rotated about the rotation axis D, the air guide body 90 rotates accordingly.

For a rotationally correct installation of the adjusting member 80 and the air guide body 90 together advantageously provides a combination of groove and projection protruding into the groove or the like other mechanical rotation angle 81 B, for example, between the channel body 81 and the inner circumference or the flow channel 94 of the air guide body 90 is.

The air guide body 90 has a cylindrical or tubular shape and extends along the longitudinal axis L in the suction passage 45. In the suction passage 45 of the air guide body 90 is rotatably mounted. The air guide body 90 has a peripheral wall 91, are provided at the flow openings 92, 93, can flow through the air into an interior of the air guide body 90, namely in a flow channel 94. On the outer circumference of the air guide body 90 are sealing contours 95, for example, longitudinal ribs provided, which bear against the inner circumference of the suction 45 or at least arranged close to this inner circumference. By the sealing contours 95 are angular segments of the air guide body 90 separated from each other so to speak. One of the angle segments includes, for example, the flow openings 92, another angle segment the flow openings 93. The other angle segments, which are separated by the sealing contours 95 from each other, have no flow openings, so are flow-tight.

By rotating the air guide body 90 in the suction channel 45 about the rotation axis D, the flow openings 92 can be positioned opposite the inlet openings 50 or 51 or 52 associated through openings 68, so that dust D via the respective inlet openings 50 or 51 or 52, the transverse channels 58 and the flow-through openings 92 can flow into the flow channel 94 and can continue to flow via the adjusting element 80 to the suction connection 1 1, where the dusty air S from a flow channel 17 of the connection element 12 can flow into the suction hose SL. A flow cross section of this flow connection is maximum.

The air guide body 90 thus forms a valve body or mask body 96, from the rotational position with respect to the axis of rotation D of the flow cross-section depends, which is ready for the respective inflow openings 50, 51 or 52 for suction via the suction port 1 1.

A respective rotational position adjustment position of the air guide body 90 and the adjusting body 80 can be understood by at least one index 97, the body 80 is arranged, for example, on the outer circumference of the sleeve-shaped adjustment. Symbols 98 for the respective machining area section 28, 29, 30 on the adjusting body 80, in particular close to the index or the indices 97, are also advantageously arranged. Thus, the operator can easily recognize which processing surface area 28, 29, 30 in the respective rotational position. tion of the adjusting body 80 and the air guide body 90 is currently sucked, for example, if only the flow openings 92 are present.

The flow-through openings 93, however, are an option. The number or the effective flow cross-section of the flow-through openings 93 is smaller than the number or the effective flow cross-section of the flow-through openings 92. Thus, if the flow-through openings 93 are opposite the passage openings 68, there is still an extraction via the inflow openings 50 or 51 or respectively associated with the passage openings 68 52 possible, but with compared to the suction through the flow openings 92 smaller suction or suction.

Also possible is an embodiment in which, for example, the flow-through openings 92 or the flow-through openings 93 or a combination of both, i. Both the through-openings 92 and the flow-through openings 93 are positioned opposite the throughflow openings 68 assigned to a respective machining surface section 28, 29, 30. Thus, the suction power for a respective processing surface 28, 29, 30 can be varied in a total of 4 stages: no flow, greater flow over the flow-through openings 93, even greater flow over the flow-through openings 92 and maximum flow over the combination of the flow-through openings 92 and 93.

In the adjustment device 260 shown in FIGS. 8-1 1, an adjustment facial expression arranged at the front side in the vicinity of the suction connection 11 ensures that the dusty air can flow through one of the suction channels 245, 246 or 247 or the flow cross section of these suction channels 245, 246 or 247 is released or closed. A mask body 296 of the adjustment device 260 is arranged between the suction connection 11 and the front side or on the front side of the processing body 220.

The suction channels 245, 246 or 247 extend in a Absaugkanalkörper 265, which extends along the longitudinal axis L in the processing body 220. The Absaugkanalkörper 265 has a peripheral wall 266 which a rohrformigen Limited interior space in which along the longitudinal axis extending and with each other, approximately in the center of Absaugkanalkörpers 265 connected partitions 267 are arranged. The partitions 267 are arranged, for example, star-shaped and separate the limited by the peripheral wall 266 interior of Absaugkanalkörpers 265 in the suction channels 245, 246 or 247. On the peripheral wall 266 communicating through openings 268 are provided with the suction channels 245, 246 or 247, which are fluidly connected with transverse channels 58, which in turn communicate with the inlet openings 50, 51, 52 and thus the processing surface parts 28, 29, 30. Thus, each machining surface section 28, 29, 30 is assigned to one of the suction channels 245, 246 or 247.

By means of an adjusting element 280 of the adjusting device 260, in each case one of the suction channels 245, 246 or 247 can be fluidly connected to the suction port 11, so that, as a result, one of the machining surface sections 28, 29 or 30 is in flow communication with the suction port 11 and an exhaust for the respective processing surface section 28, 29 or 30 is available. The adjustment member 280 forms or includes the mask body 296.

The adjusting element 280 rotatably receives the connecting element 12 already explained. For example, the adjusting element has a receptacle 283, in which the connecting portion 14 is rotatably mounted. In the recess 15 engages, for example, arranged on the receptacle 283 holding projection 284, for example, an annular retaining projection 284 in the manner of the retaining projection 84, so that the connecting element 12 with respect to its axis of rotation D rotatable, but not along the axis of rotation D from the Recording 283 is extendable. Thus, therefore, the adjusting member 280 is rotatably mounted relative to, for example, the suction hose SL or vice versa, the suction hose SL rotatably mounted with respect to the adjusting member 280.

Further, the adjusting member 280 is rotatably supported relative to a connecting member 270 which is rotationally fixed with respect to the processing body 220 and the suction channel body 265. The connection element 270 comprises, for example, a NEN sleeve portion 273, in which the Absaugkanalkörper 265 received or in which this is inserted.

The connector 270 is e.g. in front of a cover 243 and is preferably integrally connected to this, which corresponds in principle to the cover 43 and the machining body 220 covers the front side. The cover 243 has a passage opening 244.

On the connecting element 270, a bearing receptacle 278 is provided for the adjusting element 280. The adjusting member 280 is rotatably received in the bearing receiver 278. On the inner circumference of the bearing receptacle 278 is, for example, a support projection 287, which engages in a support receptacle 277 of the adjusting element 280. The support projection 287 and the support receptacle 277 form a pull-out protection or ensure that the adjustment element 280 is rotatable relative to its axis of rotation D of the bearing receptacle 278, but not along the axis of rotation D from this bearing receptacle 278 can be pulled out.

The adjusting element 280 is braced with front-side supporting projections 282 at the bottom of the bearing receiver 278, in particular on an annular bearing surface 275. In the area of the bearing surface 275, latching recesses 279, in any case at least one latching recess 279, are additionally provided, which are or are provided for latching with one or more latching projections 289. The at least one latching projection 289 protrudes in front of the support projections 282 and engages in the latching recess 279 in respective adjustment positions of the adjustment element 280. Preferably, the elasticity of the locking projection 289 is increased by having a cavity 289A into which an arcuate portion 289B of the locking projection 289 can deform.

On the outer circumference of the sleeve-shaped adjusting element 280, for example its peripheral wall 291, symbols 98A and 98B and another symbol not visible in the drawing are provided which indicate the suction with respect to a respective machining surface section 28, 29 or 30. In the interior of the adjusting element 280 extends an end wall 295, on which a flow-through opening 292 and optionally a flow-through opening 293 is provided. The flow-through opening 292 has a large area and extends over an angle segment, which corresponds to the flow cross-section of a suction channel 245-247. Thus, if the flow-through opening 292 is located frontally in front of one of the suction channels 245-247 or is aligned therewith, a maximum flow cross-section is available for the processing area section 28-30 assigned to the respective suction channel 245-247. If, however, the smaller cross-section of the flow-through opening 293 is located in front of a respective suction channel 245-247, the flow cross-section is smaller, ie the suction output is reduced. When the end wall 295 completely or partially covers one of the suction channels 245-247, the working surface section 28, 29 or 30 associated with the suction channel is not sucked off or at reduced suction power. The adjusting element 280 thus influences the effective flow cross-section, which is available for extracting a respective machining section 28, 29, 30.

The latching arrangement or the latching means with the latching projection 289 and the latching recess 279 is preferably designed such that in a respective latching position the flow-through opening 292 is aligned with one of the suction ducts 245-247.

A cross section of the flow-through opening 292 expediently corresponds to a flow cross-section of a suction channel 245, 246, 247.

In the one-piece device 360, a concept that is similar in principle to the one-piece device 260 is selected, wherein the suction channels 345, 346, 347 are separate tubes that pass through the machining element 320 parallel to the longitudinal axis L. For example, the individual tubes may be integrally molded in the manufacturing process of the processing body 320, for example, in foaming the base material 39 having a corresponding shape. Instead of a single mask body 296, one or more mask bodies 396, 496 may be provided, for example disk-like or drum-like mask bodies. The mask bodies 396, 496 are rotatably mounted, for example, about an axis of rotation, which is not visible in the drawing, extending between the suction channels 345, 346, 347 parallel to the longitudinal axis L with respect to the suction channels 345, 346, 347. The axis of rotation corresponds, for example, to the already explained rotary axis D.

The mask body 396 has, for example, a flow-through opening 392 and preferably a further flow-through opening 393, which can be made flush by rotation about the aforementioned axis of rotation to the suction channels 345, 346, 347. Thus, the mask body 396 thus forms an adjustment element 380.

In FIG. 13, for example, the flow-through opening 392 is aligned with the suction channel 347, while the flow-through opening 393 is aligned with the suction channel 346, thus providing a smaller flow cross-section there. Accordingly, the machining surface section 30 is sucked off with a higher suction power than the machining surface 29. In FIG. 14, the mask body 396 is rotated counterclockwise so that the throughflow opening 392 is only partially in front of the suction channel 347, thus reducing the suction power or the flow cross section is. In FIG. 15, the flow-through opening 392 is in alignment with the suction channel 346, so that a maximum suction power is available on the machining surface section 29, while the suction on the machining surface section 30 is, so to speak, switched off.

It can be seen that a stepless adjustment of a suction power or of a flow cross-section would be possible even with the aid of the mask body 396, namely that the mask body 396 or the adjusting element 380 can not only stand in such setting positions, in which the flow-through opening 392 with one of the suction channels 345, 346 , 347 is aligned, but also in intermediate positions, in which the flow-through opening 392 only partially before one of these suction Channels is and a reduced flow through the respective suction through the suction flow S allows.

The possibilities for adjusting the suction power at one or more of the machining surface parts 28, 29 or 30 can be improved by the further mask body 496. This has, for example, a flow-through opening 492, which makes adjustable by rotating the mask body 496 relative to the suction channels 345, 346, 347 and relatively through-flow openings 392 and optionally 393 variable flow cross-sections between the suction port 1 1 and the suction channels 345, 346, 347.

A processing body 420 (Figure 16) is formed as a step body. The processing body 420 includes, for example, part processing bodies 420A, 420B having different cross sections. Both sub-processing bodies 420A, 420B are directly adjacent to each other or adjacent to each other with a step 418 provided between the two sub-processing bodies 420A, 420B. The part processing bodies 420A, 420B may be made in one piece or in one piece.

Although the partial processing bodies 420A, 420B have the same cross-sectional geometry in the embodiment according to FIG. 16, they have different cross-sectional area expansions. As a result, it is apparent that curvature parts 427A, 427B of the part-processing bodies 420A, 420B have the same basic geometrical contours, but different radii.

The part processing bodies 420A, 420B have curvature parts 427A, 427B corresponding geometrically to the curvature part 27, and face surface parts 426A, 426B corresponding to the flat surface part 426.

In principle, it would be possible for the part-processing bodies 420A, 420B to be coaxial with respect to a longitudinal axis passing centrally through their respective cross-sections. In the present case, however, an embodiment is chosen in which the plane surface parts 426A, 426B of the part-processing bodies 420A, 420B are combined in a planar manner. the transition, ie without step into each other, so that a continuous plane surface portion 426 is formed.

However, between the bends 427A, 427B of the part-processing bodies 420A, 420B, the step 418 is provided.

Furthermore, the configuration of the machining body 420 is such that machining surfaces 422A, 422B of the partial machining bodies 420A, 420B are aligned with the planar surface portion 426 at least in a transition region 438 corresponding to the transitional region 38, while between machining surfaces 423A, 423B corresponding to the already described machining surfaces 23 are basically similar, as well as between the transition regions 437A, 437B, which in principle the same transition region 37, the step 418 is formed. Again, it should be noted that this offset or step 418 may also be provided between the processing surfaces 422A, 422B when the

Part processing bodies 420A, 420B are arranged transversely to a longitudinal axis LA of the processing body 420 differently relative to each other (not shown).

Preferably, the processing body 420 has a suction, i. that, for example, the connection element 12 with the connection section 13 is arranged on the machining body 420, in particular on the part-processing body 420A which is smaller in cross-section. However, it would also be possible to have such a suction connection on the other, a larger cross-section

Provide part processing body 420B.

On the processing body 420, in particular the processing surfaces 423A and / or 423B and / or 422A and / or 422B, for example, the abrasive material 124, for example a grain, a granule structure, a knit or the like, may be arranged directly.

It is also possible for the machining body 420 to have, for example, a retaining means 480 comparable to the retaining means 40 in the region of the machining surfaces 423A and / or 423B and / or 422A and / or 422B, on which a grinding agent or polishing agent, for example, an abrasive sheet, polishing material, polishing or polishing fabric or the like, is releasably attachable.

It is possible that different surface finishes are provided on the working surfaces 423A, 423B, 422A, 422B, e.g. for example, a holding means on one of the working surfaces, a polishing material on another, and a polishing knit on another working surface.

Claims

claims

1 . A surface processing apparatus (10), in particular a manual grinder or polishing apparatus, having a processing body (20) having at least one processing surface (21-23) for grinding or polishing a workpiece surface (O), the processing body (20) having a planar surface portion (26) with a planar processing surface (21) for processing flat workpiece surfaces (O) and at least one curved portion (27) with a curved processing surface (22, 23) for processing curved workpiece surfaces (O), characterized in that the curved portion ( 27) extends over a side of the machining body (20) opposite the planar surface part (26), the curved part (27) having a plurality of continuously merging curved sections (31-36) with mutually different radii of curvature (R1-R5) and not facing the plane working surface (21 -23) of the plane surfaces partie (26) protrudes.

2. Processing device (10) according to claim 1, characterized in that the curved portion (27) and the plane surface portion (26) at at least one transition region (38) angled adjacent to each other.

3. Processing device according to claim 2, characterized in that a curvature section (31-36) of the curvature part (27) at the at least one angled transition region (38) has a larger radius of curvature (R5) than at least one further curvature section (31-36) of the curvature part (27), in particular a largest radius of curvature (R1 -R5) or the largest radius of curvature (R5) of the curved portion (27).

4. Processing device according to one of the preceding claims, characterized in that the curved portion (27) at exactly one or at least one transition region (37) passes tangentially into the plane surface portion (26).

5. Machining device according to one of the preceding claims, characterized in that a radius of curvature (R1) of a tangential in the plane surface portion (26) merging curvature section (31 -36) smaller than a radius of curvature (R2-R5) at least one further curvature section (32-36 ) of the curvature part (27), preferably of all other radii of curvature (R2-R5) of the other curvature sections (32-36) of the curvature part (27).

6. Processing device according to one of the preceding claims, characterized in that the curvature part (27) on at least one side or exactly one side laterally next to the plane surface portion (26) protrudes.

7. Processing device according to one of the preceding claims, characterized in that at least one, in particular angular, transition region (38) between the plane surface portion (26) and the curvature portion (27) no polish or abrasive (140) or no holding means (40) for Holding an abrasive (140) or polishing agent is arranged.

8. Processing device according to one of the preceding claims, characterized in that extending the curved portion (27) and the plane surface portion (26) on opposite sides of the machining body (20) substantially over its entire transverse width.

9. Processing device according to one of the preceding claims, characterized in that the planar surface part (26) extend over a part of the cross section of the machining body (20) and the curved part (27) over all other areas of the cross section of the machining body (20).

10. Processing device according to one of the preceding claims, characterized in that the curvature part (27) adjoins opposite transverse end regions of the plane surface part (26).

1 1. Machining device according to one of the preceding claims, characterized in that the processing body (20) is designed wholly or at least in sections as a cylinder and / or as a cone and / or as a step body, on whose lateral surface the curved portion (27) and the plane surface portion ( 26) are provided.

12. Processing device according to one of the preceding claims, characterized in that the machining body (20) in the region of the curvature part (27) has the profile of the top of a wing, on the underside of the plane surface portion (26) is arranged.

13. Processing device according to one of the preceding claims, characterized in that the processing body (20) is elastic at least in the region of the at least one processing surface (21-23) and / or in particular in the region of the at least one processing surface (21-23) is a foam material. Material has.

14. Processing device according to one of the preceding claims, characterized in that the machining body (20) on its outer circumference (24) or on the processing surfaces (21 -23) holding means (40), in particular a Velcro layer, for holding an abrasive (140) or Having polishing.

15. Processing device according to one of the preceding claims, characterized in that the machining body (20) on its outer circumference (24) and / or on the working surfaces (21 -23) integrally comprises an abrasive (140) or polishing agent.

16. Processing device according to one of the preceding claims, characterized in that the machining body (20) has a longitudinal shape and / or is designed as a cylinder.

17. Processing device according to one of the preceding claims, characterized in that arranged on the at least one processing surface (21 -23) inflow openings (50-52) for sucking dust-laden dust air, which via a channel arrangement (57) with a suction ( 1 1) are stromungsverbunden, to which a suction device (AB) can be connected.

18. Processing device according to claim 17, characterized in that it has an adjusting device (60; 260; 360) for adjusting effective flow cross sections, with which inflow openings (50-52) of a first processing surface section (29, 30) (28) of the at least one Processing surface (21 -23) and inflow openings (50-52) of at least one second processing surface (29, 30) of the at least one processing surface (21 -23) with the suction port (1 1) are current-connected, so that a suction effect on the first processing surface area ( 28) of the at least one processing surface (21-23) and the at least one second processing surface portion (29, 30) of the at least one processing surface (21-23) is adjustable and / or switched off.

19. Processing device according to claim 17 or 18, characterized in that on the at least one processing surface (21 -23) to the processing surface (21 -23) laterally open inlet channel arrangement is arranged, which with the suction port (1 1) based on at least one of the inlet openings (50-52) or the inlet openings (50-52) is stromungsverbunden.