US20230339062A1 - Sanding pad having a sealing element and a rib structure, and sanding machine - Google Patents

Sanding pad having a sealing element and a rib structure, and sanding machine Download PDF

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Publication number
US20230339062A1
US20230339062A1 US17/908,563 US202117908563A US2023339062A1 US 20230339062 A1 US20230339062 A1 US 20230339062A1 US 202117908563 A US202117908563 A US 202117908563A US 2023339062 A1 US2023339062 A1 US 2023339062A1
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US
United States
Prior art keywords
sanding
sealing element
machining
sanding pad
supporting wall
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Pending
Application number
US17/908,563
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English (en)
Inventor
Stefan Tulodziecki
Mutasem Rabah
Frank Siebert
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Festool GmbH
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Festool GmbH
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Application filed by Festool GmbH filed Critical Festool GmbH
Assigned to FESTOOL GMBH reassignment FESTOOL GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SIEBERT, Frank, RABAH, Mutasem, TULODZIECKI, STEFAN
Publication of US20230339062A1 publication Critical patent/US20230339062A1/en
Pending legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B55/00—Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
    • B24B55/06—Dust extraction equipment on grinding or polishing machines
    • B24B55/10—Dust extraction equipment on grinding or polishing machines specially designed for portable grinding machines, e.g. hand-guided
    • B24B55/102—Dust extraction equipment on grinding or polishing machines specially designed for portable grinding machines, e.g. hand-guided with rotating tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B23/00—Portable grinding machines, e.g. hand-guided; Accessories therefor
    • B24B23/02—Portable grinding machines, e.g. hand-guided; Accessories therefor with rotating grinding tools; Accessories therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B41/00—Component parts such as frames, beds, carriages, headstocks
    • B24B41/04—Headstocks; Working-spindles; Features relating thereto
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B55/00—Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
    • B24B55/06—Dust extraction equipment on grinding or polishing machines
    • B24B55/10—Dust extraction equipment on grinding or polishing machines specially designed for portable grinding machines, e.g. hand-guided
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D7/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting otherwise than only by their periphery, e.g. by the front face; Bushings or mountings therefor
    • B24D7/02—Wheels in one piece
    • B24D7/04—Wheels in one piece with reinforcing means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D9/00—Wheels or drums supporting in exchangeable arrangement a layer of flexible abrasive material, e.g. sandpaper
    • B24D9/08—Circular back-plates for carrying flexible material

Definitions

  • the invention relates to a sanding pad for a sanding machine, comprising a drive holder, situated on the machine side of the sanding pad, to be fastened in a non-rotatable manner to a drive of the sanding machine, such that the sanding pad can be driven by the sanding machine in an in particular rotational and/or eccentric sanding motion that is suitable for sanding a workpiece (W); wherein the sanding pad comprises a machining side, which is opposite the machine side and has a machining face on which a sanding means for abrasive machining of a workpiece (W) can be arranged so as to be fixed or removable using an adhesive layer; wherein inflow openings for dust-laden dirty air (S) to flow in are situated in the machining face, and outflow openings fluidically connected to the inflow openings via through-channels are situated on the machine side; wherein the outflow openings are situated in a suction zone within an annul
  • the planar body is designed as a supporting body, wherein a soft pad is arranged on the lower side of the same and is thus directed towards the machining side.
  • the planar body is stiffened by a rib structure that extends around the drive holder.
  • a sealing element in the form of a running surface extends annularly around this rib structure, on which a counter-sealing element, for example a sealing collar or the like of the sanding machine can bear to form a seal.
  • a counter-sealing element for example a sealing collar or the like of the sanding machine can bear to form a seal.
  • the concept of the known sanding pad provides that the ribs can only be arranged radially on the inside, close to the drive holder, while the plate-shaped sealing element or the running surface is provided radially on the outside.
  • the stiffening concept is thus limited in the case of the known sanding pad.
  • a sanding pad known from U.S. Pat. No. 9,302,365 B2 has a planar body on which a sanding pad is arranged, wherein a row of through-flow openings allows a flow through the sanding pad from its machining side to its machine side.
  • a cover ring suitable for guiding a flow flowing through the through-flow openings is arranged on the machine side.
  • a sanding pad which has a cushion having a chamber structure is known from DE 20 2013 010 480 U1.
  • a support plate is arranged on the chamber structure and covers the chamber structure.
  • DE 10 2010 012 007 A1 describes a sanding plate having a base plate that has a tool holder for driving a sanding machine, and a cushion part having air channels on the lower side of the base plate.
  • the sealing element covers at least some of the cavities toward the machine side.
  • a basic concept of the sanding pad is that the rib structure is also present in the region of the sealing element, for example the running surface for the counter-sealing element of the sanding machine, wherein gaps between the ribs are covered by the sealing element.
  • the planar body and ultimately also the sanding pad are also reinforced by the rib structure in the region of the sealing element or in the radial distance of the sealing element to the drive holder. Nevertheless, the sealing element is located there.
  • Cavities of the planar body that are closed or covered by the sealing element are, in particular, such cavities that are closed to the radially outer edge region of the planar body by the material of the planar body.
  • the planar body preferably forms a hard component of the sanding pad that stiffens the sanding pad.
  • the planar body is preferably not made of a foamed material and/or made of foam.
  • the planar body is preferably made of a hard plastic or rigid plastic or metal.
  • planar body is advantageously harder and/or more rigid in relation to a cover body, for example a sanding pad, arranged on the machining side.
  • the rib structure is preferably integral with the supporting wall. However, it is also possible for the rib structure to be adhesively bonded, overmolded or cast onto the supporting wall or the like.
  • the sanding pad is manufactured in such a way that the sealing element forms a first component and the supporting wall, which has the rib structure, forms a second component of the sanding pad, which are or will be connected to one another.
  • the rib structure already present on the supporting wall is at least partially covered by the sealing element in the course of the production of the sanding pad.
  • the planar body has further ribs on a radially outer edge region with respect to the drive holder, in particular ribs of the type that extend in a star shape or radiate from a center of the planar body or sanding pad.
  • Such ribs can have a stiffening function, for example.
  • the ribs can form flow channels. Recesses are present between these ribs, which are advantageously not covered by the sealing element.
  • the radially outer edge region of the planar body is advantageously not covered by the sealing element.
  • the sealing element can be plate-like, for example. However, it is also possible for the sealing element to contain a sealing collar or a part of a sealing collar. Therefore, the sealing element or the counter-sealing element or both can be designed as a collar or another flexible sealing element.
  • the sealing element and the counter-sealing element bear against one another in a sealing fit, so that the suction zone is housed or enclosed by the sealing element and the counter-sealing element.
  • the sealing element which covers the cavities on the machine side is preferably the only sealing element for the sealing contact of the or of a counter-sealing element of the sanding machine.
  • planar body and/or the sealing element are preferably essentially rigid, in particular when arranged on one another.
  • the sealing element preferably has a sealing surface for contacting the counter-sealing element, which is designed as a flat surface or planar surface.
  • the sealing surface and the machining surface are preferably parallel to each other.
  • the sealing element preferably comprises a ring body and/or plate-shaped or wall-like body.
  • planar body and/or the sealing element advantageously consist of metal and/or a thermosetting plastic.
  • the planar body and/or the sealing element can consist of a fiber-reinforced material, for example, one containing glass fibers and/or carbon fiber-reinforced plastic.
  • the planar body is preferably designed on the machine side in such a way that, without the sealing element at least partially covering the cavities, it has no sealing surface, in particular no sealing surface extending annularly around the drive holder, for sealing contact with the or a counter-sealing element of the sanding machine.
  • the planar body it is possible for the planar body to have, in addition to the sealing element covering the cavities, at least one additional sealing surface or sealing contour, in particular extending annularly around the drive holder, for sealing contact with a counter-sealing element of the sanding machine.
  • Both the sealing element and the counter-sealing element can be hard components or soft components or both.
  • the sealing element is plate-shaped or flat, i.e., the component located on the sanding pad has a plate-like or web-like shape.
  • the counter-sealing element is preferably designed as a seal collar or sealing collar, which is arranged, for example, on the tool holder of the sanding machine, which can be brought into engagement with the drive holder of the sanding pad.
  • the tool holder of the sanding machine is located in particular centrally within the counter-sealing element and is annularly enclosed thereby.
  • this configuration is also advantageous in the sanding pad, i.e., the drive holder is located centrally in the region of the sealing element or in its center.
  • the sealing element and the planar body can be integral.
  • the sealing element is extruded onto the planar body or integrally produced, for example by an injection molding process.
  • the planar body and the sealing element are separate components that are, however, fixedly connected to one another.
  • the fixed connection can be a non-detachable connection, for example a welded bond, adhesive bond, or the like.
  • the fixed connection can also be a detachable connection, for example a latching connection, clamp connection, form-fitting connection, adhesive bond with a detachable adhesive, or the like.
  • the sealing element is arranged in a stationary manner on the planar body during operation of the sanding pad or for operation of the sanding pad on the planar body.
  • At least one cavity of the planar body that is covered by the sealing element of the sanding pad on the machine side is advantageously a demolding cavity that is formed by removing a casting core from the cavity.
  • the planar body is produced, for example, by means of a die and a core.
  • the die ultimately defines the formation of the supporting wall, while the core is needed to form the rib structure.
  • the casting cavity in which the planar body is formed during casting or injection molding, is provided between the die and the core. If the core is removed from the matrix, i.e., the planar body is removed, so to speak, the cavities between the ribs of the rib structure are created.
  • the sealing element covers and/or tightly closes all the cavities of the planar body within the suction zone and/or on a planar flat side of the planar body between the drive holder and an edge region of the planar body.
  • the planar body has further ribs on the outside or radially on the outside with respect to the drive holder or the sealing element, which, however, are not covered or overlapped by the sealing element.
  • the edge region preferably has a conical or sloping profile. The edge region preferably rises from the outer edge of the planar body to its region at which the sealing element is arranged.
  • the sealing element covers all cavities or at least a large part of the cavities of the planar body, in particular closes them tightly. It is particularly advantageous if the sealing element, except for the outflow openings, covers or tightly closes all cavities of the planar body that are not open radially outwards with respect to the drive holder of the planar body or sanding pad.
  • the sealing element closes at least one, preferably multiple, or all cavities completely and/or tightly.
  • a preferred concept provides that the sealing element, except for the outflow openings, tightly closes at least part of the cavities, preferably all cavities or a large number of cavities, so that a volume located in the respective cavity is closed or enclosed in a dust-tight manner
  • Those cavities of the planar body which are closed by the sealing element are preferably completely closed by the sealing element.
  • Such a closed cavity is closed, for example, by the rib structure, wherein ribs of the rib structure form peripheral walls of the cavity, and on opposite sides by the supporting wall and the sealing element.
  • the sealing element and the supporting wall are connected to the ribs forming the peripheral walls in such a way that the cavity is completely closed.
  • the sealing element covers and/or tightly closes at least one, multiple, or all of the cavities provided and designed to form one or more through channels and/or at least one or all through channels. It is possible that cavities distant from the through channels are covered by the sealing element, but are not completely tightly closed. A cavity covered by the sealing element that is not tightly closed, for example by welding or adhesive bonding, is also protected against the penetration of dust.
  • cavities are initially still present in the raw planar body, so to speak, but these are covered or closed by the sealing element.
  • the cavity is delimited on first sides, for example two, three, or four sides, for example by the ribs and the supporting wall, and the sealing element closes the at least one second side, for example a fourth, fifth, or sixth side.
  • the sealing element, the supporting wall, and the ribs completely surround or enclose a volume in one or more cavities. No dust can therefore get into the respective cavity when the sanding pad is in operation.
  • the mechanical properties for example balancing or synchronization of the sanding pad, do not change or are at least not changed by dust that could otherwise settle in the cavity.
  • the sealing element rests flatly on the end faces of the ribs of the rib structure facing toward the sealing element. This makes it possible, for example, to enclose volumes in a respective cavity.
  • sealing element is connected to the planar body, for example to the ribs, in particular to their end faces, by means of a weld, for example a thermal weld, an ultrasonic weld, or the like.
  • a weld for example a thermal weld, an ultrasonic weld, or the like.
  • an adhesive bond can also be provided. Therefore, a permanent connection of sealing element and planar body is advantageous.
  • welding tips or welding projections are provided.
  • the sealing element and/or the planar body have at least one welding projection, for example a welding tip, welding rib, or the like, for welding to the respective other component of planar body and sealing element or are connected to one another by means of such a welding projection.
  • the welding projection can be configured as a narrow ridge, for example.
  • the at least one welding projection can be a so-called energy director, for example. In the case of thermal welding, for example ultrasonic welding, the welding projection melts and thus ensures that planar body and sealing element are welded.
  • the at least one welding projection has an elongated shape.
  • the at least one welding projection can also, for example, comprise or be formed by an arrangement of multiple welding spots or punctiform welding projections.
  • the at least one welding projection or a welded connection formed by means of the welding projection is, for example, designed like a frame or forms a frame.
  • the at least one welding projection or a welded connection formed by means of the welding projection extends, for example, around an outflow opening of the planar body in such a way that the outflow opening is sealed off from the surroundings when the at least one welding projection or a welded connection formed by means of the welding projection connects the sealing element tightly to the planar body in the surroundings of the outflow opening.
  • no dust-laden air from the region of the outflow opening can get between the sealing element and the planar body.
  • planar body and the sealing element are advantageously supported in a form-fitting manner on one another in a direction of force parallel to the machining surface or geometric plane of the machining surface.
  • form-fitting contours of planar body and sealing element bear against one another.
  • the form-fitting contours or form-fitting surfaces can include, for example, form-fitting projections and form-fitting receptacles on one part each of planar body and sealing element.
  • the form-fitting support can, for example, support a torque that occurs between planar body and sealing element during operation using the sanding machine.
  • Such a torque results, for example, due to friction of the counter-sealing element on the sealing element and/or in the case of sanding contact of the machining surface on a workpiece, in each case when the sanding pad is driven by the sanding machine.
  • the sanding machine can readily be a rotary sanding machine, i.e., the sanding pad is designed and provided for rotational, abrasive, or sanding machining of a workpiece.
  • the sanding pad it is also possible for the sanding pad to be configured as an eccentric sanding pad and the sanding machine as an eccentric sanding machine.
  • various operating modes are settable, for example by setting the sanding machine between a rotation principle, an eccentric drive principle, or a hypercycloidal rotation drive principle, i.e., to an eccentric rotation operation.
  • the sealing element for example by means of clamping means and/or latching means and/or a detachable adhesive bond, is detachably arranged on the planar body.
  • the sealing element is a separate component per se from the planar body, it is detachably connected to the planar body. Thus, for example, when the sealing element or the planar body is worn, the respective worn component can easily be replaced.
  • the sealing element and the planar body are expediently connected to one another in a form-fitting manner by at least one pairing of a form-fitting projection and a form-fitting receptacle, wherein the form-fitting projection and the form-fitting receptacle extend transversely, for example perpendicularly, to the machining surface and interlock.
  • the at least one form-fitting projection is, for example, a form-fitting pin and the at least one form-fitting receptacle is a form-fitting pin receptacle.
  • the form-fitting projection can also have a wall-like configuration.
  • the form-fitting projection can be supported, for example, on a rib of the rib structure.
  • a form-fitting receptacle is then formed between the ribs. It is possible that a respective form-fitting projection is supported only in one direction of force on a wall of a form-fitting receptacle, for example on a rib of the rib structure. At least one pairing or an arrangement of multiple pairs of form-fitting projections and form-fitting receptacles can also be used as an assembly aid or temporary holder, for example until a weld or adhesive bond is produced between the sealing element and the planar body.
  • a latching pin or latching projection is expediently provided as at least one form-fitting projection.
  • the at least one form-fitting receptacle expediently includes a latching receptacle.
  • the at least one form-fitting projection can also be a plug projection and the at least one form-fitting receptacle can be a plug receptacle.
  • the plug projection is pluggable into the plug receptacle along a plug axis.
  • a plug receptacle can be designed as a latching plug receptacle and a plug projection can be designed as a latching plug projection.
  • the plug receptacle and the plug projection expediently have rear gripping surfaces which extend transversely to the plug axis and impede or prevent removal of the plug projection from the plug receptacle.
  • the rear gripping surfaces can be aligned, for example, obliquely to the plug axis or at right angles to the plug axis. It is possible that the rear gripping surfaces are normally at a distance from one another, in particular when the sealing element is in any case subjected to a force in the direction of the planar body, in particular by the counter-sealing element. However, it is preferred if the rear gripping surfaces bear against one another, so that the sealing element is also held fixedly on the planar body in the direction of the plug axis.
  • the plug projection expediently has at least two plug segments, preferably three or four plug segments, which can be moved relative to one another transversely to the plug axis.
  • the plug segments are displaceable towards one another and/or movable away from each other.
  • the plug segments can initially be displaced towards one another in the plug axis direction when they are plugged in, until there is free space that allows the plug segments to move away from one another again.
  • the above-mentioned rear gripping surfaces are provided on the free space, for example.
  • the plug segments are formed, for example, in that the plug projection has a slot that extends in the direction of the plug axis and penetrates a plane in which the plug axis is located.
  • the sealing element has at least one support contour, for example a support receptacle and/or a support rib projecting in front of the sealing element, which is provided and configured for lateral contact on a rib delimiting a cavity.
  • the support contour can also be, for example, a welding projection or can be formed thereby.
  • the sealing element and the planar body are supported on one another in a direction of force parallel to the machining surface.
  • the planar body has a support contour, in particular a support rib, provided and configured for engagement with a counter-support contour of the sealing element, for example for engagement in a support receptacle, groove, or the like on the sealing element.
  • the sealing element has two spaced-apart support contours, for example two spaced-apart support ribs or inner sides of a form-fitting receptacle, in particular a receptacle groove, which are intended for contact on opposing ribs delimiting a cavity or, for example in the form of a receptacle groove, delimit a receptacle for the engagement of a rib.
  • the sealing element and the planar body are supported on one another in opposite directions of force parallel to the machining surface.
  • the at least one support contour has at least two support contours extending at an angle to one another, for example support ribs, for support on ribs which are at an angle to one another.
  • the sealing element and the planar body are supported on one another in directions of force at an angle to one another parallel to the machining surface.
  • the at least one support contour comprises a support frame for lateral contact on an inner circumference of a cavity delimited by ribs, for example three or four or five ribs.
  • the ribs and legs of the support frame extend at an angle to one another, for example, in the shape of a triangle, a square, a trapezoid, or the like.
  • the at least one support contour can preferably form or comprise a welding projection for thermal welding, for example ultrasonic welding, of the sealing element to the planar body.
  • the at least one support contour for example, only ensures a form-fitting hold of the sealing element on the planar body and/or represents a support contour which is provided and configured for the adhesive bonding of sealing element and planar body.
  • the sealing element covers all cavities on the machine side that are located within the suction space. Cavities located outside of the suction space can also be covered by the sealing element. It is possible here that all cavities located outside of the suction chamber are covered by the sealing element.
  • the sanding pad has a cover element which covers at least part of the cavities on the machine side.
  • both the sealing element and the cover element can each cover cavities on the machine side.
  • a sandwiched arrangement is also possible, i.e., both the cover element and the sealing element are arranged above a respective cavity. It is also possible that the sealing element covers at least part of the cavities with the interposition of the cover element, which it would also cover without cover element.
  • the cover element is preferably plate-shaped.
  • the cover element is preferably configured as a ring body.
  • sealing element and the cover element are integrally or fixedly connected to one another. Furthermore, it is possible that the sealing element comprises or forms the cover element.
  • the cover element is preferably held fixedly on the planar body.
  • the cover element is held on the planar body in a form-fitting manner and/or by means of the sealing element and/or by means of an adhesive bond, in particular a detachable adhesive bond, and/or a weld.
  • the sealing element can thus form a holding element for the cover element, so to speak.
  • the sealing element can be held on the planar body by means of the cover element, for example in a form-fitting manner
  • a part of the sealing element can engage in a gap between cover element and planar body and can thus be held by the cover element on the planar body.
  • the cover element advantageously has openings that can be provided for multiple purposes, for example for form-fitting elements, using which the sealing element and the planar body are fixed on one another in a form-fitting manner, for engaging holding contours of the sealing element, i.e., for example holding projections which are arranged on the sealing element and engage in the openings.
  • the openings can also be provided for dirty air to flow through or for the drive holder.
  • the openings can preferably be passage openings.
  • the openings are only recesses or indentations, for example for engaging holding contours of the sealing element. Passage openings are not absolutely necessary at these points.
  • the sealing element preferably has holding projections for holding the cover element on the planar body.
  • the holding projections preferably extend in a plane parallel to the machining surface.
  • the holding projections can comprise hook projections, the hook sections of which engage in the cover element, for example in one of the above-mentioned openings, which are configured as passage openings or recesses.
  • the holding projections can be or comprise holding projections which protrude radially outwards, i.e., away from the drive holder, but preferably in the direction of the drive holder. In particular in the direction of the drive holder, namely in the suction zone, it is advantageous if additional holding projections hold the cover element on the planar body.
  • the holding projections can extend up to the drive holder.
  • the sealing element and/or the cover element preferably completely or essentially covers cavities of the planar body in the region of the suction zone. It is advantageously provided that only outflow openings for the dirty air in the suction zone and/or the drive holder are not covered by the sealing element and/or the cover element.
  • sealing element and the cover element are concentric and/or annular. Both the sealing element and the cover element can extend annularly around the drive holder. Circular rings are readily possible here.
  • the sealing element and/or the cover element have a similar basic geometric contour as the planar body or the sanding pad.
  • the above-mentioned annular shape of the sealing element and the cover element can be a circular annular shape, it can also be, for example, a triangular annular shape or a rectangular annular shape.
  • the sealing element and/or the cover element expediently have an outer peripheral contour which correlates with the outer peripheral contour of the planar body or sanding pad, for example, a round or circular annular outer peripheral contour, a triangular outer peripheral contour, or a rectangular outer peripheral contour.
  • the cover element is preferably fixed on the planar body by the sealing element in a rotationally-fixed manner with respect to an axis of rotation around which the planar body rotates during operation of the sanding machine.
  • Form-fitting contours, using which the sealing element and the planar body are engaged with one another, preferably engage in a form-fitting manner in form-fitting receptacles or form-fitting contours of the cover element.
  • the sealing element and/or a cover element that at least partially covers the cavities of the planar body can be plate-like or wall-like.
  • the sealing element has a higher mechanical load capacity and/or wall thickness than the cover element.
  • the cover element can consist of a film-like material or a material having a thin wall thickness, while the sealing element, which is at least frictionally loaded during operation by the counter-sealing element of the sanding machine, has a higher rigidity or strength than the cover element.
  • a step is provided between the sealing element and the cover element. The step is formed, for example, in that the sealing element has a greater material thickness than the cover element.
  • the sealing element and/or the or a cover element at least partially covering the cavities of the planar body, for example both together, cover, except for the outflow openings for the dirty air outside and/or within the suction zone, all cavities of the planar body on the machine side, which are closed with respect to an outer circumference of the planar body between the machine side and the machining side.
  • further cavities can be provided radially on the outside or at the edge of the planar body, which are not closed by the cover element or sealing element.
  • ribs of the rib structure are open at the edge or towards the outer edge of the sanding pad and are not covered there by the sealing element or cover element.
  • At least a part of the ribs of the planar body extend radially or radiating away from the drive holder to an edge region of the sanding pad.
  • transverse ribs or transverse reinforcements can be provided between these ribs.
  • a part of the ribs of the planar body preferably define a common support plane or support surface in which the ribs support the sealing element and/or the cover element.
  • the support plane is, so to speak, an enveloping or common plane in which the ribs of the planar body form a support plane, so to speak.
  • the support plane can be a flat surface or flat plane. It is advantageous if all ribs or cavities of the planar body in the region of the support plane are covered and/or closed by the sealing element and/or the cover element.
  • the supporting wall can be a substantially closed supporting wall, on which the inflow openings are provided, however.
  • the supporting wall has recesses and indentations on the machining side, so that a type of rib structure is formed, for example.
  • the supporting wall of the planar body has, for example, recesses on the machining side to form the inflow opening and/or for providing at least partial sections of the through channels.
  • the recesses extend, for example, radially from an outer circumference of the sanding pad toward the drive holder and/or toward the outflow openings located adjacent to the drive holder.
  • the machining surface of the sanding pad can be provided directly by the supporting wall.
  • an adhesive layer for the sanding means or the sanding means itself can be arranged there.
  • the sanding means comprises, for example, a knitted sanding means fabric and/or an abrasive grit material, for example corundum.
  • the sanding means is preferably an abrasive sheet.
  • the sanding pad is advantageously suitable for fastening a sanding sheet on the work surface.
  • a cover body is arranged on the supporting wall, which covers the supporting wall and, in particular, also closes recesses on the planar body.
  • the cover body can have through-flow openings or through-flow channels and can have the inflow openings of the sanding pad.
  • the cover body comprises, for example, an elastic and/or resilient cushion body, for example a kind of pad or is formed by it.
  • the cushion body is elastic and/or consists of a plastic which is airtight and/or impermeable to dust particles.
  • the cushion body consists of foam.
  • the cushion body comprises or consists of polyurethane foam, in particular an elastomeric foam based on polyester and/or an aromatic PUR elastomeric foam.
  • the cushion body is configured as a pad or cushion, for example.
  • the cover body can completely or substantially completely cover the planar body on the machining side. It is preferred if the cover body covers the planar body on the machining side except for an edge region which is remote from the drive holder and is provided for engaging behind the sanding means and/or except for inflow openings or through-flow openings for dirty air. For example, there is no adhesive layer on the edge region, so that the sanding means, for example an abrasive sheet, is removable from the sanding pad.
  • the inflow openings on the machining surface are fluidically connected to and/or communicate with inflow openings or through-flow openings of the cover body.
  • cover body forms an advantageous embodiment of the invention, i.e., it is suitable for advantageous arrangement on the planar body.
  • the cover body is used on a different sanding pad, for example on a sanding pad that has no cavities and/or is not covered by a sealing element or a cover element or both.
  • a sanding pad has a planar body on which the cover body is arranged according to the following embodiment, but on which no special measures have been taken.
  • planar body has inflow openings and outflow openings which are fluidically connected to one another by means of through channels, so that dirty air flowing in on the machining side of the planar body can pass through the through channels to the outflow openings, where it can be extracted by, for example, the suction device, the sanding machine, or the like.
  • a cover body for a sanding pad or as part of a sanding pad, wherein the sanding pad is configured in particular according to one of the preceding claims, wherein the cover body is configured as a cushion and has a supporting wall body and a machining wall body, between which an elastic and/or resilient cushion body is held in a sandwich-like manner, wherein the supporting wall body and the machining wall body have flat sides facing away from one another, of which the flat side of the supporting wall body is provided and configured for contact on one or the planar body of the sanding pad and the flat side of the machining wall body contains a sanding means or an adhesive layer for the detachable fastening of a sanding means, in which it is provided that the machining wall body and the supporting wall body are connected to one another by a connecting device on an outer circumference of the cover body, so that the cushion body is protected against mechanical damage by the supporting wall body, the machining wall body, and the connecting device on
  • the cover body is so to speak reinforced at the edge, i.e., at its circumference, by the connecting device, at least it covers the cushion body. Therefore, the cushion body is enclosed in a chamber which is provided on the one hand by the supporting wall body and the machining wall body on opposite sides of the cushion body, and on the peripheral side by the connecting device.
  • the connecting device thus preferably forms a reinforcement of the cover body on its outer circumference.
  • an outer circumference of the cover body preferably essentially has the same contour as an outer circumference of the planar body or disk body of the sanding pad.
  • the supporting wall body and/or the machining wall body consist of material which is different and/or has higher tensile strength than the cushion body. Therefore, the cover body and the machining wall body ensure a protective envelope for the cushion body having high tensile strength.
  • the cushion body is preferably a foam body, for example made of a polyurethane foam or the like. Therefore, the cushion body is elastically yielding.
  • the supporting wall body is not present, i.e., the cushion body bears directly on the planar body, for example a supporting wall of the planar body, and the planar body is connected to the machining wall body by the connecting device.
  • the cushion body consists, for example, of a single foam material or foamed material or of a combination of at least two foamed materials or foam materials.
  • the supporting wall body and/or the machining wall body preferably consist of a textile material.
  • the supporting wall body and/or the machining wall body are more closely meshed or less porous than the cushion body.
  • the supporting wall body and the machining wall body are thin, i.e., for example, the cushion body is at least twice as thick, preferably at least three times as thick as the supporting wall body and the machining wall body.
  • the textile material of the supporting wall body and/or of the machining wall body is preferably reinforced, for example by polyamide fibers.
  • the connecting device comprises, for example, a seam or connecting bodies spaced apart from one another, for example rivets or the like, or is formed by a seam or rivets.
  • the seam or the connecting bodies are, for example, angularly spaced apart from one another.
  • the seam or the connecting bodies connect the supporting wall body and the machining wall body, for example directly to one another.
  • at least one section of the cushion body is penetrated, so to speak, between the supporting wall body and the machining wall body by the connecting device, for example the seam, the connecting bodies, and the like.
  • the cover body is edged with the seam on its outer circumference.
  • the seam is sewn through the respective front sides or flat sides of the supporting wall body and machining wall body.
  • the connecting device comprises a material bond or is formed by a material bond, for example a welded bond and/or an adhesive bond.
  • the material bond connects the supporting wall body and the machining wall body to one another, for example directly to one another. It is also possible in this case, for example, that an intermediate layer or a portion of the cushion body is adhesively bonded or welded between the supporting wall body and the machining wall body, wherein the welding makes the material of the cushion body stiffer and more resilient on its outer circumference, so to speak.
  • an adhesive bond there can also be an ultrasonic welded bond, for example.
  • the connecting device can be formed by a material vulcanized onto the machining wall body and the supporting wall body, which at the same time produces a material bond between the two wall bodies.
  • a ring body is also advantageous as the connecting device, which at least partially surrounds the outer circumference of the cover body.
  • the ring body encloses the cover body like a clasp.
  • the ring body comprises, for example, at least one peripheral wall covering the cushion body on the outer periphery of the cover body, or a peripheral wall section. It is also advantageous in the ring body if it has one or more, for example two, leg sections on which a respective flat side of the supporting wall body, a flat side of the machining wall body, or the planar body of the sanding pad is supported.
  • the supporting wall body, the machining wall body, and the planar body can be supported between opposite legs or between legs of the ring body. Therefore, the ring body can also hold the planar body.
  • the ring body has, for example, a clamp opening or a slot that enables the ring body to be fastened on the cover body.
  • Longitudinal ends of the ring body, between which the clamp opening or the slot is provided, can be movable toward one another in the sense of enclosing the cover body.
  • several ring segments can be joined together to form the ring body, or the ring body can comprise multiple ring segments. It is preferred if the ring body completely or essentially surrounds the outer circumference of the cover body, so that it is protected as completely as possible on the circumference by the ring body.
  • the ring body can clamp the machining wall body with the supporting wall body and/or the planar body.
  • the ring body can be configured as a bent part.
  • the ring body may comprise ring bodies lying opposite to one another and connected in particular by rivets, bolts, or other similar connecting bodies, between which the machining wall body and the supporting wall body are held in a sandwich-like manner
  • a section of the planar body for example an outer edge section of the planar body, also engages between these ring bodies.
  • the at least one ring body can also comprise or be formed by a ring body which is arranged between the supporting wall body and the machining wall body or has a section arranged between the supporting wall body and the machining wall body.
  • the ring body can surround the cushion body radially on the outside or on the outer circumference of the cover body.
  • the supporting wall body and/or the machining wall bodies advantageously consist of a material that is more impact-resistant and/or denser and/or harder than the cushion body.
  • the ring body which is sandwiched between the supporting wall body and the machining wall body, preferably consists of a ring body that has a higher tensile strength and/or is more impact-resistant and/or denser than the cushion body.
  • this ring body can also be made of a foam material or porous or flexible material, for example. However, this material is preferably less porous or stronger or harder or all together than the cushion body.
  • the ring body can also be elastic and can be deformed by a force acting on the machining wall body in the direction of the supporting wall body.
  • the ring body consists at least partially of rubber or elastic plastic.
  • the ring body can be produced, for example, by vulcanization or can be connected by means of vulcanization to the cover body, for example the supporting wall body and/or the machining wall body. Therefore, the ring body preferably forms a wall body that covers the cushion body radially on the outside or on the outer circumference of the cover body.
  • the cover body expediently has a large-region central region in which the cushion body is arranged and around which the connecting device extends. In the central region, there is preferably no connection between the machining wall body and the supporting wall body that penetrates the cushion body.
  • the advantage here is that in the central region the cushion body has its elasticity to the full extent, i.e., it brings the sanding means arranged on it, for example, flatly into contact against the workpiece to be processed.
  • the machining wall body has a large-region central region in which the machining wall body projects farther in front of the supporting wall body and/or farther in front of the planar body than at the outer circumference of the cover body.
  • a setback is implemented by the connecting device.
  • this setback is advantageously not stepped, but continuous. Therefore, the cover body preferably has a convex or cushion-like shape in the region of the machining wall body.
  • Inflow openings for dirty air are expediently arranged on the flat side of the machining body, which are connected to outflow openings on the flat side of the supporting wall body via through channels. dirty air can flow through the cover body through the through channels.
  • the outflow openings of the cover body communicate when mounted on the planar body of the sanding pad with inflow openings of the planar body, which in turn are fluidically connected via through channels to outflow openings on the machine side of the sanding pad.
  • the cushion body extends all the way to the outer circumference of the cover body and/or up to the connecting device.
  • a cavity enclosed by the supporting wall body and the machining wall body, so to speak air is arranged between the cushion body and the outer circumference of the cover body. This cavity is preferably configured as an annular space.
  • the cover body having the edge-side connecting device offers a special advantage in particular in conjunction with eccentric sanding machines, i.e., in which the sanding pad runs through an eccentric or at least non-rotational movement.
  • the connecting device protects the cushion body from damage.
  • the sanding means is preferably an abrasive sheet which can be removed from the sanding pad and held on it detachably.
  • the adhesive layer comprises, for example, a component of a hook-and-loop connection, for example a hook-and-loop layer or hook-and-loop hooks, for the detachable fastening of the sanding means.
  • the sanding means can be arranged directly on the cover body, for example the sanding mat.
  • the cover body it is also possible for the cover body to have or carry the adhesive layer, for example a hook-and-loop layer, for the detachable fastening of the sanding means on the sanding pad.
  • the invention furthermore relates to a sanding machine having a sanding pad according to the invention and a counter-sealing element for contact on the sealing element of the sanding pad.
  • the counter-sealing element has, for example, an elastic ring body made of an elastic material.
  • the counter-sealing element can also readily be a plate-shaped body that slides along the sealing element.
  • it is advantageous if the counter-sealing element is held on a housing of the sanding machine in a resiliently yielding manner with respect to the sealing element.
  • the sanding machine has, for example, a drive motor for driving a tool holder, on which the drive holder of the sanding pad can be detachably fastened.
  • the drive motor can be an electric motor, for example an electronically commutated or brushless motor, a universal motor, or the like. However, the drive motor can also be a compressed air motor.
  • a gear and/or an eccentric bearing for an eccentric mounting of the tool holder with respect to an axis of rotation of the drive motor can be arranged between the tool holder and the drive motor.
  • one or more contact bodies are expediently embedded for sanding contact on the sealing element of the sanding pad, wherein the at least one contact body is made of a material that is harder than the elastic material, for example metal.
  • the counter-sealing element is wear-resistant.
  • Holding pins in particular several holding pins at an angular spacing, expediently protrude from the sealing element and engage in pin receptacles of the planar body.
  • cover and/or sealing element By appropriate geometric configuration of cover and/or sealing element, it is readily possible to set an suction concept of the sanding pad individually.
  • the cavities of the sanding pad are not filled by dust or other material over time, which can negatively influence the running behavior or smooth running of the sanding pad or its balancing.
  • the suction behavior or suction behavior of the dirty air can be set.
  • the sealing element can readily be replaced when worn.
  • the material of the sealing element can readily be adapted to the properties of the counter-sealing element, for example its contact force, frictional force, or the like, so that matching material combinations of sealing element and counter-sealing element are selectable.
  • FIG. 1 shows a perspective diagonal view of a sanding machine in partial section having a sanding pad which is shown in
  • FIG. 2 in an exploded view diagonally from above and in detail enlargements D 2 , D 3 , and D 4 and in
  • FIG. 3 assembled diagonally from above
  • FIG. 4 shows an exploded view of the sanding pad according to the above figures, approximately corresponding to FIG. 2 , but diagonally from below and with detail enlargements D 5 and D 6 ,
  • FIG. 5 shows the sanding pad according to the preceding figures diagonally from below
  • FIG. 6 shows a top view of the sanding pad of the preceding figures frontally from above
  • FIG. 7 shows a partial portion corresponding to a detail D 1 .
  • FIG. 8 shows the partial portion according to detail D 1 , but along a portion line B-B in FIG. 6 of detail D 1 ,
  • FIG. 9 shows an exploded view of the sanding machine in partial section according to FIG. 1 having a sanding pad in a further embodiment
  • FIG. 10 shows the sanding pad according to FIG. 9 diagonally from above
  • FIG. 11 shows an exploded view of the sanding pad according to FIG. 10 diagonally from above
  • FIG. 12 shows an exploded view of the sanding pad according to FIGS. 10 , 11 diagonally from below,
  • FIG. 13 shows an alternative sealing element for the sanding pad according to FIGS. 9 - 12 .
  • FIG. 14 shows a section along a section line C-C through the sanding pad according to FIG. 10 .
  • FIG. 15 shows a section along a section line D-D through the sanding pad according to FIG. 10 .
  • FIG. 16 shows a variant of the sanding pad according to the preceding figures, but with a cover element which is reinforced at the edge by a reinforcing device in a first embodiment
  • FIG. 17 shows the sanding pad and in particular the cover body according to FIG. 16 diagonally from below
  • FIG. 18 shows a detail D 7 from FIG. 17 .
  • FIG. 19 shows a variant of the sanding pad according to FIG. 16 having a smaller cushion body, approximately corresponding to a detail D 8 in FIG. 16 ,
  • FIG. 20 shows a further cover body, a variant of a sanding pad, and a cover body having a ring body as the connecting device,
  • FIG. 21 shows a portion through the sanding pad according to FIG. 20 , approximately corresponding to detail D 8 in FIG. 16 ,
  • FIG. 22 shows the sanding pad according to FIG. 20 diagonally from above, but having an alternative ring body
  • FIG. 23 shows a partial portion through an edge region of the sanding pad according to FIG. 22 , approximately corresponding to detail D 8 ,
  • FIG. 24 shows a further sanding pad and a further cover body having an edge-side adhesive bond or weld of the cover body
  • FIG. 25 shows a detail of the sanding pad and cover body according to FIG. 24 , approximately corresponding to detail D 8 ,
  • FIG. 26 shows a further sanding pad and cover body having a stamped and bent part as a ring body and connecting device, of which in
  • FIG. 27 a detailed portion approximately corresponding to detail D 8 is shown
  • FIG. 28 shows a further sanding pad and cover body diagonally from below, of which in
  • FIG. 29 a detail portion, for example detail D 8 is shown
  • FIG. 30 shows a further sanding pad and cover body diagonally from below having an elastic edge protection, which is shown in detail in
  • FIG. 31 as a portional view (approximately corresponding to detail D 8 ).
  • a sanding machine 15 is used for sanding a workpiece surface, for example, a wall surface of a space, a mobile workpiece W, or the like.
  • the sanding machine 15 can be gripped at a handle 16 which, in contrast to the drawing, can be connected to a machine housing 20 of the sanding machine 15 fixedly or, as shown in the drawing, movably by means of a joint 17 .
  • the handle 16 can be an integral part of the machine body 20 and can protrude fixedly therefrom, in contrast to what is shown in the drawing.
  • the handle 16 which is in particular rod-shaped, allows the sanding machine 15 to be guided along the remote workpiece surfaces, for example along ceilings or side walls of a room.
  • a drive motor 25 is accommodated in a motor portion 21 of the machine housing 20 , for example an electronically commutated motor, a universal motor, or the like.
  • An output 26 of the drive motor 25 drives an eccentric bearing device 27 which supports a tool shaft 28 in a rotatable manner, namely by means of one or more pivot bearings.
  • the bearing device 27 has a tool holder 29 on which a sanding pad 40 can be detachably fastened using its drive holder 49 .
  • the drive holder 49 and the tool holder 29 have, for example, corresponding screw contours, bayonet contours, or similar other fastening means for detachable fastening.
  • the tool shaft 28 has an eccentricity to a shaft of the drive motor 25 (not shown in more detail in the drawing), on which the output 26 is arranged, i.e., an axis of rotation E of the tool holder 29 is eccentric to an axis of rotation M of the drive motor 25 . Therefore, a rotational but eccentric sanding movement or drive movement can be generated by the drive train of the sanding machine 25 .
  • this eccentricity is only one embodiment, i.e., the sanding machine 25 could in principle also drive the sanding pad 50 without such an eccentricity, for example if the tool holder 29 were arranged directly on the output 26 of the drive motor 25 .
  • the sanding pad 40 is arranged within a protective body 23 which is designed, for example, in the manner of an suction hood or protective hood.
  • the protective body 23 is held by a tool portion 22 of the motor housing 20 arranged on the motor portion 21 or is integral with it.
  • a machining face 45 of the sanding pad 40 projects in front of the protective body 23 , i.e., in front of its edge 24 oriented or projecting towards the machining face 45 .
  • An suction device 30 is used to extract dust that is produced when using the sanding machine 15 or the sanding pad 40 , namely in that particles are removed from the workpiece W.
  • the suction device 30 is arranged on the tool portion 22 , for example.
  • the suction device 30 has an suction fitting 31 to which a hose 12 of an suction device 11 , for example a vacuum cleaner, is connectable.
  • the suction device 11 generates a suction flow so that dirty air S can be extracted from the region of the machining surface 45 .
  • an suction device or a flow generator could also be provided directly on the sanding machine 15 , in particular a fan wheel or the like. This can be drivable, for example, by the drive motor 25 or a separate drive motor.
  • the suction fitting 31 is fluidically connected to an suction chamber 32 which extends around the tool holder 29 . If a machine side 41 of the sanding pad 40 is subjected to negative pressure or extracted, the outflow openings 43 for the dirty air S that are present there and are located in the suction chamber 32 are subjected to negative pressure.
  • Ambient air L furthermore flows from the outside around the sanding pad 40 , for example through a gap 34 between the protective body 23 , the suction hood, and the sanding pad 40 and/or through through-flow openings 33 of the protective body 23 .
  • the through-flow openings 33 are provided on an edge region 47 of the sanding pad 40 .
  • An suction zone 44 in the center of the sanding pad 40 i.e., an suction zone that extends around the drive holder 49 , is delimited by a sealing arrangement 35 , which also encloses or houses the suction chamber 32 .
  • the sealing arrangement 35 comprises a counter-sealing element 36 of the sanding machine 15 which, when the sanding pad 40 is mounted on the sanding machine 15 , bears against a sealing element 80 of the sanding pad 40 to form a seal.
  • the counter-sealing element 36 comprises, for example, an elastic ring body 37 , in particular a type of sealing collar.
  • the ring body consists for example of elastic plastic, rubber, or the like.
  • the counter-sealing element 36 can have displacement contours, beads, or the like so that it is deformable relative to the substantially rigid or non-elastic sealing element 80 .
  • contact bodies 38 are embedded in the ring body 37 and slide along the sealing element 80 of the sanding pad 40 .
  • the contact bodies 38 are made of a harder material than the ring body 37 and comprise, for example, metal pins.
  • the machining surface 45 of the sanding pad 40 is arranged on its machining side 42 .
  • Inflow openings 48 for the inflow of dirty air S are also located there.
  • the inflow openings 48 communicate with through-channels 59 of the sanding pad 40 , which are fluidically connected to the outflow openings 43 .
  • the sealing element 80 extends around the suction zone 44 on the machine side 41 .
  • the outflow openings 43 which open into the suction chamber 32 , so to speak, are arranged in the interior of the suction zone 44 .
  • the sealing element 80 thus annularly encloses the suction zone 44 .
  • An outer zone 46 is provided radially on the outside with respect to the drive holder 49 , i.e., between the edge region 47 or the outer circumference of the sanding pad 40 and the sealing element 80 , which is closed off towards the machine side 41 , namely by a cover element 70 .
  • a rib structure 45 of the sanding pad 40 is open, but not to the side 41 , but also to the outer edge of the sanding pad 40 , so that no dust deposits or the like are to be feared there.
  • the sanding pad 40 experiences its rigidity essentially due to the planar body 50 , which is essentially rigid.
  • the planar body 50 consists of metal, of a thermosetting plastic, or the like.
  • the planar body 50 is reinforced by the rib structure 45 .
  • the planar body 50 is provided on its machine side 51 with a plurality of cavities 57 which are located between ribs 56 of the rib structure 55 .
  • the cavities 57 result essentially due to the demolding of the planar body 50 in the context of a casting process, for example when a casting core GK (shown schematically in FIG. 3 ) is removed from a respective cavity 57 .
  • a casting core GK shown schematically in FIG. 3
  • the supporting wall 54 has a plurality of recesses 59 A, which communicate with the inflow openings of the sanding pad 40 or form them. portions of the recesses 59 A can be represented by inflow openings 58 , for example.
  • the through-channels 59 communicate with outflow openings 53 on the machine side of the planar body 50 so that dirty air flowing into the recesses 59 A and the inflow openings 58 can flow through the through-channels 59 to the outflow openings 53 .
  • planar body 50 is open on its machining side 52 due to the recesses 59 A, it is in any case closed or covered by a cover body 560 .
  • the cover body 560 is arranged with its machine side 61 on the machining side 52 of the planar body 50 , for example adhesively bonded to the planar body 50 , connected in a form-fitting manner (not shown), or the like.
  • the cover body 560 has a plate-like shape.
  • the cover body 560 has, for example, through-flow openings 63 which are fluidically connected to the inflow openings 58 of the planar body 50 or communicate with them.
  • a passage opening 569 is provided on the cover body 560 in the region of the drive holder 49 , so that, for example, a fastening screw or the like, using which the sanding pad 40 is connectable to the tool holder 29 , is actuatable.
  • the cover body 560 On its machining side 62 , the cover body 560 preferably has an adhesive layer 66 , for example a hook-and-loop layer, an adhesive layer, or the like, for a sanding means 90 , in particular an abrasive sheet 90 A.
  • an adhesive layer 66 for example a hook-and-loop layer, an adhesive layer, or the like, for a sanding means 90 , in particular an abrasive sheet 90 A.
  • a sanding means for example a grit, a sanding means fabric, or the like, could be arranged directly.
  • the planar body 50 is essentially covered by a cover element 70 on the machine side 51 .
  • the cover element 70 extends into the outer zone 46 and covers the rib structure 55 there towards the machine side. Thus, no dust or any other undesirable material can penetrate into the cavities 57 of the outer zone 46 .
  • the cover element 70 also essentially covers the cavities 57 of the rib structure 55 radially on the inside with respect to the sealing element 80 .
  • a machining side 72 of the cover element 70 rests on the ribs 56 and can, for example, be adhesively bonded and/or welded to them, for example thermally welded.
  • the cover element 70 is held in a form-fitting manner on the planar body 50 , namely by the sealing element 80 .
  • through-flow openings 73 of the cover element 70 are aligned with the outflow openings 53 of the planar body 50 , so that they can represent the outflow openings 43 of the sanding pad 40 .
  • the cover element 70 is not only provided in the region of the outer zone 46 to cover part of the cavities 57 , but also in the suction zone 44 .
  • There the cover element 70 covers all the cavities 57 of the rib structure 55 , except for the outflow openings 53 and the drive holder 49 , for which through-flow opening 73 or passage openings 79 , respectively, are provided.
  • the cover element 70 has further passage openings 78 , namely for holding projections 89 and thus holding contours 88 which engage in the holding receptacles or passage openings 78 in a form-fitting manner
  • the holding projections 85 are polygonal or are provided in some other way with an anti-twist contour on their outer circumference, i.e., around their respective plug axis along which they are pluggable into the holding receptacles 78 .
  • the sealing element 80 has a sealing body 83 A which has a passage opening 83 and thus has an annular shape.
  • the inner peripheral contour of the sealing body 83 A delimiting the passage opening 83 delimits the suction zone 44 .
  • a sealing surface 83 B is provided on the machine side 81 of the sealing element 80 , against which the counter-sealing element 36 can bear to form a seal, i.e, for example, can rub along.
  • the holding projections 89 penetrate the holding receptacles 78 or passage openings of the holding element 70 and protrude freely into the cavities 57 .
  • plug receptacles or similar other form-fitting holding contours could also be provided for the holding projections 89 , so that the sealing element 80 can be fastened directly to the planar body 50 in a form-fitting manner by means of the holding projections 89 .
  • Such a form-fitting support enables, for example, support against a direction of force F, which extends parallel to the machining surface 45 .
  • a torque generated by the sealing elements 36 and 80 rubbing against one another is supported on the planar body 50 .
  • the sealing element 80 is connected in a form-fitting manner, namely latched, directly to the planar body 50 using latching means 84 .
  • the latching means 84 include form-fitting projections 85 which protrude towards the machining side 82 of the sealing element 80 and engage in a form-fitting manner in form-fitting receptacles 95 of the planar body 50 .
  • the form-fitting projections 85 and the form-fitting receptacles 95 are, for example, plug projections and plug receptacles.
  • the form-fitting projections 85 could engage in the form-fitting receptacles 95 , for example with a press fit, which results, for example, in that the form-fitting projections 85 have slots 85 C, 85 D, so that plug segments 85 A, 85 B are formed, which are relatively movable toward one another and away from one another transversely to a plug axis SA.
  • a press fit is provided on lateral support surfaces 98 of the form-fitting receptacle 95 , using which the respective form-fitting projection 85 for supporting the force F is supported on the form-fitting receptacle 95 .
  • the support surfaces 98 support, for example, a base region of a respective form-fitting projection 85 , using which it is connected to the sealing body 83 A.
  • the form-fitting projections 85 are configured, for example, like holding pins that engage in the holding receptacles or form-fitting receptacles 95 .
  • Rear gripping surfaces 97 are provided counter to a plug axis direction, along which the form-fitting projections 85 are inserted into the form-fitting receptacles 95 .
  • the rear gripping surfaces 97 are located in an expanded section 96 of a respective form-fitting receptacle 95 , into which a head region 86 of a respective form-fitting projection 86 engages.
  • the head region 86 also has rear gripping surfaces 87 which protrude transversely to the plug axis SA in front of the base region or base section of a respective form-fitting projection 85 .
  • the form-fitting projections 85 are thus supported in a form-fitting manner in the form-fitting receptacles 95 in the direction of a removal of the sealing element 80 from the planar body 50 .
  • the plug segments 85 A, 85 B are displaced toward one another in the direction of the slots 85 C, 85 D or in the direction of a narrowing of the slots 85 C, 85 D, so that the head regions 86 can reach the widened portion 96 of the form-fitting receptacle 95 past the support surfaces 98 and latch there with the form-fitting receptacle 95 .
  • the slots 85 C, 85 D extend, for example, in a cross shape and/or at an angle to one another.
  • an adhesive bond of the sealing element 80 to the planar body 50 can also be provided.
  • the form-fitting projections 85 are arranged at angular intervals, preferably equal or equidistant angular intervals, on the sealing element 80 and protrude toward the machining side 82 of this element.
  • the form-fitting projections 85 penetrate passage openings 75 of the cover element 70 so that this is held in a sandwich-like manner between the sealing element 80 and the planar body 50 .
  • the holding contours 88 or holding projections 89 form additional holding elements which fix the cover element 70 with respect to the planar body 50 .
  • the holding projections 89 are, for example, likewise arranged at angular intervals from one another, in particular at regular angular intervals from one another. It can be provided that a holding projection 89 is provided next to or on each, preferably only every second, form-fitting projection 85 .
  • a cover body 60 can also be provided.
  • the cover body 60 is fastened to the planar body 50 with a machine side 61 , for example adhesively bonded thereon or connected detachably to it, which will become even clearer hereinafter.
  • a supporting wall body 64 of the cover body 60 bears against the planar body 50 .
  • the cover body 60 On a machining side 62 opposite to the machine side 61 , the cover body 60 has a machining wall body 65 , which is used to fasten and support the sanding means 90 , in particular the sanding means 90 A.
  • An adhesive layer 66 is arranged on the machining wall body 65 , for example, which can be connected to the adhesive layer 94 of the sanding means 90 , for example in the manner of a hook-and-loop connection.
  • a cushion body 67 made of a foam material or other elastic material is arranged between the supporting wall body 64 and the machining wall body 65 , so that the machining side 62 or the machining wall body 65 can deform with deformation of the cushion body 67 in the direction of the machining side 52 of the planar body 50 in order to conform to contours of the workpiece W.
  • the supporting wall body 64 and the machining wall body 65 have flat sides 64 F, 65 F facing away from each other, of which the flat side 64 F of the supporting wall body 64 is provided and configured for contact on the planar body 50 of the sanding pad 60 , 160 and the flat side 65 F of the machining wall body 65 has the adhesive layer 66
  • the cover body 60 has through-flow openings 63 which, when the cover body 60 is mounted on the planar body 50 , are aligned with the inflow openings 58 , so that dirty air S, which flows through the through-flow openings 93 of the sanding means 90 into the cover body 60 , flows into the inflow openings 63 E of the cover body 60 and through through-flow openings 63 , can flow out of outflow openings 63 A of the cover body 60 and can furthermore flow through the planar body 50 .
  • a sanding means for example an abrasive fabric, a grit material, or the like, could readily be arranged directly on the cover body 60 or 560 .
  • the cover body 60 is adhesively bonded on the planar body 50 , for example.
  • the cover body 60 is advantageously releasably fastenable on a planar body 150 of a sanding pad 140 , namely, for example, by means of screws 68 B that are inserted through passage openings 68 in the cover body 160 and screwed into screw receptacles 68 D of the planar body 150 that are arranged on its machining side 52 .
  • the screws 68 B have screw heads 68 C, which are supported on the machining side 62 of the cover body 60 , which is configured as a flat side. Contrary to what is shown in the drawing, but as indicated by dash-dotted lines in FIG.
  • the screw heads 68 C plunge into the machining side 52 or the machining wall body 65 in such a way that troughs are formed therein which the screw heads 68 C are accommodated, and a substantially flat surface 62 B results on the machining side 62 .
  • slots 68 A extend from the passage openings 68 , for example in a star shape, which enable or facilitate a deformation or trough formation of the cover body 60 in the region of the screw heads 68 C.
  • the sanding pad 160 has the above-mentioned planar body 150 , which has a machine side 51 on which a drive holder 149 is provided.
  • the drive holder 149 is used to fasten a tool holder 129 , which has certain differences from the tool holder 59 , but also has an eccentric bearing device 27 .
  • Holding projections 29 A are provided on its outer circumference, on which screw receptacles 29 B are arranged.
  • the holding projections 29 A are preferably accommodated in the drive holder 149 in a form-fitting manner, for example by means of matching receptacle contours. However, this is not absolutely necessary, namely because screws 29 C are provided which penetrate passage openings 29 D of the planar body 150 and are screwed into the screw receptacles 29 B.
  • the planar body 150 is constructed similarly to the planar body 50 , i.e., it has a supporting wall 54 and inflow openings 58 on its machining side, which are fluidically connected via through-channels 59 to outflow openings 53 of a machine side 51 of the planar body 150 .
  • a rib structure 155 stiffens and supports the supporting wall 54 and is open toward the machine side 51 , i.e., cavities 57 are present between ribs 156 of the rib structure 155 . These cavities 57 are also covered on the machine side 51 in the case of the planar body 150 and thus the sanding pad 140 , so that dust and similar other undesirable material does not penetrate into the cavities 57 .
  • the sanding pad 160 has a sealing element 180 which is integrally enclosed by cover element 170 .
  • a machine side 81 of the sealing element 80 is used to ensure that the elastic ring body 37 and/or the counter-sealing element 36 bears against it to form a seal.
  • An annular sealing surface 83 B is provided on a sealing body 83 A of the sealing element 180 for sealing contact of the counter-sealing element 36 and extends around a passage opening 83 of the sealing element 180 .
  • the cover element 170 is arranged radially on the outside on the sealing element 180 , which annularly encloses the sealing element 180 with a ring body 174 , which has an annular shape.
  • the sealing element 180 is connected to the planar body 150 by means of a weld and essentially covers its cavities 57 , except for rib structures which are open radially outwards with respect to the sanding pad 140 .
  • Both the sealing element 180 and the cover element 170 are plate-shaped.
  • the sealing element 180 protrudes in front of the cover element 170 in a direction away from the planar body 150 .
  • Holding contours 188 can be provided on the sealing element 180 , for example holding projections, which engage in the planar body 150 , for example are supported on the ribs 156 of its rib structure 155 .
  • form-fitting contours are advantageously provided on the machine side 51 of the planar body 150 and the machining side 82 of the sealing element 180 which advantageously and/or at least during an assembly process and/or welding process of the two components interlock in a form-fitting manner and hold the two components relative to each other, so that the welding described hereinafter succeeds with optimal accuracy.
  • form-fitting projections 158 A are provided on the machine side 51 of the planar body 150 , for example in the form of centering projections or centering pins, which engage in form-fitting receptacles 178 of the cover element 170 .
  • the pairs of form-fitting receptacle 170 and form-fitting projections 158 A are provided at angular intervals with respect to the axis of rotation or central axis of the sanding pad 140 .
  • Welding projections 185 are provided on the machining side 82 of the sealing element 180 and on the machining side 72 of the cover element 170 , i.e. on the same side of both components, which projections are supported on the ribs 156 and are connected to them by means of ultrasonic welding.
  • the welding projections 185 extend partially annularly around the outflow openings 53 of the planar body 50 and to this extent close through-channels 59 via which inflowing dirty air can flow via the inflow openings 58 on the machining side 52 of the planar body 50 .
  • the course of the welding projections 185 is adapted to the course of the ribs 156 and has, for example, portions 185 A extending approximately parallel to the outer circumference of the drive holder 149 , from which portions 185 B extend away in the direction of the drive holder 149 and up to it.
  • the sealing element 180 thus covers or seals the radially inner region of the machine side 51 of the planar body 150 surrounding the drive holder 159 and is welded to this region.
  • the cavities 57 are covered radially on the outside by the cover element 170 , which rests tightly on the end faces of the ribs 156 , but is not or not completely welded to them.
  • welding projections 177 for example punctiform welding projections, are provided radially on the outside with respect to the axis of rotation of the sanding pad 140 on the machining side 72 of the cover element 170 and are welded to the material of the planar body 150 .
  • multiple welding projections 177 are provided arranged adjacent to one another at angular intervals in the circumferential direction with respect to the axis of rotation of the sanding pad 140 .
  • the welding projections 177 are arranged on the radially outer edge region of the cover element 170 with respect to the axis of rotation of the sanding pad 140 .
  • welding projections 177 form a welding projection group, for example. Between the welding projection groups of welding projections 177 , there are preferably angular intervals in which no welding projections are provided.
  • the welding projections 177 preferably form multiple row arrangements.
  • a sealing element 180 A which in principle corresponds to the sealing element 180 including the cover element 170 arranged thereon, there are welding projections which have a linear shape and also enable optimal welding to the planar body 150 in the region of the cover element 170 .
  • peripheral welding projections 185 D extending on the outer circumference of the cover element 170 are provided.
  • Annular welding projections 185 E also extend, for example, around the screw receptacles 86 D.
  • further welding projections 185 C extend radially outwards in a star shape in the region of the cover element 170 .
  • the welding projections of the sealing element 180 basically form a rib-like shape which is, so to speak, complementary to the rib structure 155 and thus comes to rest on or adjacent to the end faces of the ribs 156 .
  • a correspondingly powerful welding system for example at 20 kilowatts and more, elongated welding projections and a large number of welding projections, as in the case of the sealing element 180 A, can also be welded using ultrasound.
  • the cushion body 67 of the cover body 60 is exposed on the outer circumference 69 of the cover body 60 . As a result, for example, it is not protected against damage if the sanding pad 140 hits an obstacle.
  • alternative covering bodies 60 A, 60 B, 60 C, 60 D, 60 E, 60 F, 60 G are provided to cover body 60 , on the outer circumference 69 of which a connecting device 100 A, 100 B, 100 C, 100 D, 100 E, 100 F, 100 G is provided.
  • the connecting device 100 A- 100 G protects the respective outer circumference 69 against damage, namely in that the cushion body 67 is protected by the connecting device 100 A- 100 G, which may also be referred to hereinafter as the connecting device 100 for the sake of simplicity.
  • the basic structure of the covering bodies 60 A, 60 B, 60 C, 60 D, 60 E, 60 F, 60 G corresponds to the cover body 60 , i.e., they have supporting wall bodies 64 and machining wall bodies 65 , between which a cushion body 67 is accommodated in a sandwich-like manner in each case.
  • a seam 101 is provided in the cover body 60 A, which directly connects the supporting wall body 64 and the machining wall body 65 to one another.
  • the seam 101 is preferably configured as a zigzag seam. It is particularly advantageous if the seam 101 is configured as a type of edge.
  • the supporting wall body 64 and/or the machining wall body 65 consists, for example, of rubber, cloth, composite materials, or the like.
  • the supporting wall body 64 and the machining wall body 65 are, so to speak, connected to one another at the edge by the connecting device 100 A.
  • the connecting device 100 A in particular the seam 101 , forms a peripheral part 69 B on the outer circumference 69 , in which or on which the wall bodies 64 and 65 are arranged directly adjacent to one another and are fixedly connected to one another.
  • an inclined part 69 A of the outer circumference 69 extends to a flat or essentially flat fastening plane 69 C, which is provided for fastening the sanding means 90 .
  • the inclined part 69 A extends obliquely with respect to the fastening plane 69 C.
  • the fastening plane 69 C is preferably a flat plane in front of which the heads of the screws 68 B do not protrude, namely by plunging into the slots 68 A or troughs of the cushion body 67 .
  • a material connection 101 A for example welding, adhesive bonding, etc., is also possible.
  • the wall bodies 64 and 65 are connected directly to one another, so that the cushion body 67 is enclosed on the outer circumference 69 and is not freestanding.
  • a cavity 67 A is provided between the cushion body 67 and the outer circumference 69 , for example. This is the case, for example, in a cover body 60 A 2 .
  • the fastening plane 69 C and/or thus a middle or central region or central region 69 Z or the largest surface extension of the machining side 62 of the cover body 60 A is configured in such a way that there is no connection penetrating the cushion body 67 and the supporting wall body 64 and the machining wall body 65 there, for example, no part of the connecting device 100 , i.e., for example no seam, no material bond, or the like.
  • a ring body 102 which, so to speak, encloses the supporting wall body 64 , the machining wall body 65 , and also the supporting wall 54 .
  • the ring body 102 has, for example, a peripheral wall portion 102 A from which leg portions 102 B, 102 C project at an angle, for example at right angles.
  • a U-shaped receptacle is thereby formed, in which a peripheral part 65 A of the machining wall body 65 as well as a peripheral part 64 A of the supporting wall body 64 are accommodated.
  • the ring body 102 preferably has a slot or clamp opening 102 D so that it is installable like a clamp around the outer circumference of the sanding pad 140 , enclosing the planar body 150 and the cover body 60 B.
  • a connecting device 100 C has a similar concept as the connecting device 100 B, wherein in contrast to the ring body 102 , a ring body 103 only clamps the supporting wall body 64 and the machining wall body 65 together, so to speak.
  • the ring body 103 A has a peripheral wall portion 103 from which leg portions 103 B and 103 C project at an angle, so that a receptacle is thus formed in which the peripheral parts 65 A of the supporting wall body 64 and the machining wall body 65 are accommodated.
  • the ring body 103 also has a slot or clamp opening 103 D so that it can be arranged on the cover body 60 C enclosing it like a clamp. In doing so, it engages, for example, in a depression or peripheral receptacle 54 A of a planar body 150 C, which is arranged on the outer circumference of its supporting wall 54 and/or is open radially outwards. Otherwise, the planar body 150 C corresponds to the planar body 150 .
  • planar body 150 C is also suitable for a connecting device 100 D which has a two-part ring body 104 , so to speak. This is configured, for example, as a stamped and bent part.
  • a ring element 104 A and a ring element 104 B are, for example, welded to one another and/or adhesively bonded to one another, for example in the region of a peripheral part 104 E of the ring element 104 A.
  • a peripheral wall portion 104 C extends from this peripheral part 104 E in a direction away from the ring element 104 B, while a leg 104 B in turn lies opposite the ring element 104 B, so that between these two latter components there is a receptacle into which the peripheral wall parts 64 A and 65 A engage or in which they are accommodated.
  • a connecting device 100 E the ring body 105 of which has ring elements 105 B and 105 C, which accommodate the peripheral parts 64 A and 65 A in a sandwich-like manner and connect them to one another.
  • the ring elements 105 B and 105 C are, for example, annular, in particular circularly annular, plate bodies or wall bodies which face toward one another with their end faces or flat sides, wherein the peripheral part 65 A of the machining wall body 65 and the one peripheral part 64 A of the supporting wall body 64 are accommodated between the end faces or flat sides.
  • the ring elements 105 B and 105 C are connected to one another by connecting bodies 105 A, e.g., rivets, screws, or the like, which penetrate both the ring elements 105 B and 105 C and also the supporting wall body 64 and the machining wall body 65 and thus fixedly connect all components to one another.
  • the cover body 60 E is compacted at its outer periphery 69 and is hard and advantageously impact-resistant.
  • the ring elements 105 B and/or 105 C are not provided, wherein then the connecting bodies 105 A connect peripheral parts 64 A and 65 A directly to one another. It can be provided that only one of the ring elements 105 B and/or 105 C is present.
  • a relatively soft outer circumference of the cover element 60 F also offers optimal protection for the cushion body 67 .
  • a ring body 106 of the connecting device 105 is made of an elastic material, e.g., plastic, rubber, or the like.
  • the ring body 106 has a peripheral wall 106 A, which preferably has wall parts 106 B which are movable relative to one another.
  • the wall parts 106 B are aligned in a V-shape or are in a V-shape relative to one another.
  • Wall portions 106 C and 106 D extend away from the peripheral wall 106 A and are connected to the supporting wall body 64 and the peripheral wall body 65 , for example by material bonding, adhesive bonding, or the like.
  • a part 106 E of the ring body 106 engages in the above-explained receptacle 64 A of the planar body 150 C. It is advantageous if the planar body 150 C having the supporting wall 64 protrudes approximately up to the peripheral wall portions 106 D and 106 C, so that it can implement additional mechanical protection for the cushion body 67 .
  • a material which is more wear-resistant than the cushion body 67 but which is nevertheless flexible and is accommodated between the wall bodies 64 and 65 can also represent a connecting device, as is the case with the connecting device 100 G.
  • a ring body 107 is formed from a foam material which is more wear-resistant than the foam material of the cushion body 67 , for example harder, and/or more closed cell or the like.
  • the ring body 107 extends to the outer circumference 69 , where it is frontally open, i.e., is not covered by the supporting wall body 64 or the machining wall body 65 , for example.
  • the ring body 107 is more mechanically resilient than the cushion body 67 , it is less sensitive to impact loads than the cushion body 67 .
  • a thickness of the ring body 107 is advantageously selected so that it is less than a thickness of the cushion body 67 , wherein the thickness represents the distance between the supporting wall body 64 and the machining wall body 65 .
  • an inclined part 69 A extends to a peripheral part 69 B which is set back in relation to the central portion.
  • the supporting wall body 64 is not necessary in all cases.
  • the ring body 103 connects the machining wall body 65 directly to the supporting wall 54 , so that the cushion body 67 is enclosed between the supporting wall 54 and the machining wall body 65 .
  • the ring body 103 provides sufficient protection on the outer circumference 69 .
  • the machining wall body 65 can be connected directly to the planar body 50 , i.e., the supporting wall 54 , at the outer circumference 69 , for example, by a seam, a weld, or the like.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding-Machine Dressing And Accessory Apparatuses (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
US17/908,563 2020-03-02 2021-02-25 Sanding pad having a sealing element and a rib structure, and sanding machine Pending US20230339062A1 (en)

Applications Claiming Priority (3)

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DE102020105572.2 2020-03-02
DE102020105572.2A DE102020105572A1 (de) 2020-03-02 2020-03-02 Schleifteller mit einem Dichtungselement und einer Rippenstruktur sowie Schleifmaschine
PCT/EP2021/054637 WO2021175687A1 (de) 2020-03-02 2021-02-25 Schleifteller mit einem dichtungselement und einer rippenstruktur sowie schleifmaschine

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US (1) US20230339062A1 (zh)
EP (2) EP4114613B1 (zh)
JP (1) JP2023517191A (zh)
CN (2) CN117840882A (zh)
DE (1) DE102020105572A1 (zh)
WO (1) WO2021175687A1 (zh)

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DE102021121566A1 (de) 2021-08-19 2023-02-23 Festool Gmbh Tellerwerkzeug

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US9597776B2 (en) * 2013-11-21 2017-03-21 Kolthoff Gabrovo Eood Grinding disk

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US3924362A (en) * 1974-10-25 1975-12-09 Formax Manufacturing Corp Sanding pad assembly
AU515811B2 (en) * 1975-11-26 1981-04-30 Miksa Marton Vacuum housing for a vacuum sanding device
CA1053005A (en) * 1976-09-24 1979-04-24 Miksa Marton Pad assembly for vacuum rotary sander
DE10357144A1 (de) * 2003-12-06 2005-06-30 Robert Bosch Gmbh Schleifteller für eine Handschleifmaschine
DE102010012007A1 (de) 2010-03-15 2011-09-15 C. & E. Fein Gmbh Schleifplatte
ITMI20111434A1 (it) 2011-07-29 2013-01-30 Guido Valentini Platorello a doppia camera di aspirazione
DE102013106546A1 (de) * 2013-06-24 2014-12-24 C. & E. Fein Gmbh Schleifteller für einen Oszillationsantrieb
DE102015113190A1 (de) * 2015-08-11 2017-02-16 Festool Gmbh Schleifteller und damit ausgestattete Schleifmaschine
DE102016100072A1 (de) 2016-01-04 2017-07-06 Festool Gmbh Schleifteller und Schleifmittel

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US9597776B2 (en) * 2013-11-21 2017-03-21 Kolthoff Gabrovo Eood Grinding disk

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CN115210041B (zh) 2024-05-07
EP4450223A1 (de) 2024-10-23
CN115210041A (zh) 2022-10-18
WO2021175687A1 (de) 2021-09-10
EP4114613A1 (de) 2023-01-11
CN117840882A (zh) 2024-04-09
DE102020105572A1 (de) 2021-09-02
JP2023517191A (ja) 2023-04-24
EP4114613B1 (de) 2024-10-23

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