EP4056317A2 - Backing pad for a hand-guided polishing or sanding power tool - Google Patents
Backing pad for a hand-guided polishing or sanding power tool Download PDFInfo
- Publication number
- EP4056317A2 EP4056317A2 EP22158628.2A EP22158628A EP4056317A2 EP 4056317 A2 EP4056317 A2 EP 4056317A2 EP 22158628 A EP22158628 A EP 22158628A EP 4056317 A2 EP4056317 A2 EP 4056317A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- backing pad
- support layer
- layer
- reinforcement ribs
- polishing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
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- 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
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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
- B24B41/00—Component parts such as frames, beds, carriages, headstocks
- B24B41/06—Work supports, e.g. adjustable steadies
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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
- B24B23/00—Portable grinding machines, e.g. hand-guided; Accessories therefor
- B24B23/005—Auxiliary devices used in connection with portable grinding machines, e.g. holders
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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
- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D18/00—Manufacture of grinding tools or other grinding devices, e.g. wheels, not otherwise provided for
- B24D18/009—Tools not otherwise provided for
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Polishing Bodies And Polishing Tools (AREA)
- Vibration Prevention Devices (AREA)
- Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
Abstract
- a support layer (4) made of a rigid material, the support layer (4) comprising a connection element (6) on its top surface (8) for connection of the backing pad (2) to a driving shaft (18) or an eccentric element of the polishing or sanding power tool,
- a damping layer (10) made of a resilient material, the damping layer (10) being fixedly attached to a bottom surface (12) of the support layer (4), and
- an adhesive layer (14) for releasable attachment of a polishing or sanding member to the backing pad (2), the adhesive layer (14) being fixedly attached to a bottom surface (16) of the damping layer (10),
wherein the bottom surface (12) of the support layer (4) is provided with reinforcement elements (24, 26, 28; 46; 50, 52) for enhancing flexural rigidity of the support layer (4), and the bottom surface (12) of the support layer (4) is further provided with recesses (30) formed between and at least partially limited by the reinforcement elements (24, 26, 28; 46; 50, 52).
Description
- The present invention refers to a backing pad for a hand-guided polishing or sanding power tool, comprising
- a support layer made of a rigid material, the support layer comprising a connection element on its top surface for connection of the backing pad to a drive shaft or an eccentric element of the polishing or sanding power tool,
- a damping layer made of a resilient material, the damping layer being fixedly attached to a bottom surface of the support layer, and
- an adhesive layer for releasable attachment of a polishing or sanding member to the backing pad, the adhesive layer being fixedly attached to a bottom surface of the damping layer,
- Hand-guided polishing or sanding power tools are commonly used in the field of sanding or polishing of surfaces of vehicle bodies, boat or ship hulls or airplane fuselages. Depending on the intended use of the tools, the type of processing and/or the user's preferences, the power tools can be operated electrically (with rechargeable batteries or with mains power supply connection) or pneumatically. The polishing or sanding power tools comprise an electric or pneumatic motor with a drive shaft. The drive shaft is connected to an attachment member in a torque-proof manner either directly or indirectly, e.g. by means of a bevel gear arrangement and/or a reducer gear arrangement. The attachment member may comprise an external thread, an adapter element and/or an eccentric element.
- A backing pad is releasably attached with its connection element to the attachment member. Known backing pads comprise a rigid support layer, usually made of glass fibre reinforced plastic material, comprising the connection element on its top surface for releasable attachment to the power tool. Fixedly attached to the bottom surface of the support layer, e.g. by means of co-moulding, is a damping layer made of resilient material, e.g. polyurethane. In the prior art the bottom surface of the support layer is an even surface. Attached to the bottom surface of the damping layer is an adhesive layer, e.g. comprising a hook-and-loop fastener, for releasable attachment of a polishing or sanding member, e.g. a polishing pad or a sheet-like sanding paper or sanding fabric.
- Backing pads of the above-mentioned kind are known, for example, from
US 9,039,496 B2 - A problem with the conventional backing pads is the fact that they tend to warp during intended use due to the rather high rotational speeds at which the backing pads are usually operated and due to an eccentric movement of the backing pad during its intended use, if used with an eccentric power tool effecting a random orbital or a roto-orbital working movement. Warping means that the backing pad tends to through waves in its plane of extension. This leads to a situation in which the backing pad or the polishing or sanding member, respectively, does no longer lie evenly with its entire bottom surface on the surface to be worked, resulting in an unsatisfactory efficiency and quality of the working process. Furthermore, in order to reduce the warp effect, the support layer of conventional backing pads is made of a rather expensive glass fibre reinforced plastic material. Finally, under some circumstances the damping layer can come off the support layer.
- Therefore, it is an object of the present invention to provide for a backing pad which has an enhanced stiffness and flexural rigidity without increasing the overall weight of the backing pad, which has a safer and a tighter attachment of the damping layer to the support layer and which at the same time is more cost efficient than the known backing pads.
- In order to solve this object, a backing pad with the features of claim 1 is suggested. In particular, starting from the backing pad of the above identified kind, it is suggested that the reinforcement elements comprise a plurality of discrete pyramid-shaped elements having a base surface in the form of a circle, a triangle, a rectangle, in particular a square, or any other polygonal form, in particular an equilateral polygonal form, wherein during manufacture of the backing pad the resilient material of the damping layer enters into the recesses and after curing of the resilient material entirely fills the recesses.
- The claimed structure of the backing pad, in particular of its support layer, has the advantage that the stiffness of the support layer and with it the flexural rigidity of the entire backing pad is significantly enhanced. The reinforcement elements clearly reduce the previously described warp effect of the backing pad during its intended use. This is in particular true when the backing pad is operated at rather high rotational speeds and when the backing pad effects an eccentric movement during its intended use. In particular, the reinforcement elements significantly reduce the tendency of the backing pad to through waves in its plane of extension during its intended use. As a result, during intended use of the backing pad it lies evenly with its entire bottom surface on the surface to be worked, resulting in a particularly high efficiency and quality of the polishing or sanding process. The intended use of the backing pad in the sense of the present invention means that the backing pad is attached to a polishing or sanding power tool and carries a polishing or sanding member on the bottom surface of the adhesive layer and that the power tool is operated at a speed commonly used for working surfaces of a workpiece (e.g. a vehicle, boat airplane or the like).
- Reduction of the warp effect and the higher stiffness of the backing pad is mainly caused by a much better and firmer interference and mechanical anchoring between the damping layer and the support layer of the backing pad. This is due to the reinforcement elements of the support layer immersing into the damping layer and being completely surrounded by the cured material of the damping layer.
- Furthermore, due to the better stiffness and flexural rigidity of the backing pad according to the present invention, the support layer does not necessarily have to be made of the rather expensive glass fibre reinforced plastic material. Rather, it is possible to make the support layer of a conventional much cheaper and possibly easier to handle plastic material and still maintaining an acceptable amount of stiffness and flexural rigidity. This results in a very cost efficient backing pad which still has a high amount of stiffness and flexural rigidity.
- It is particularly advantageous in the backing pad according to the invention that due to the three-dimensional extension of the reinforcement elements on the bottom surface of the support layer and the material of the damping layer entering into the recesses provided between the reinforcement elements, the interconnection between the damping layer and the support layer is not only effective in a two-dimensional horizontal plane extending between the extension of the support layer and the damping layer, but rather in three dimensions. This significantly reduces torsion of the backing pad during intended use. The form and the structure of the reinforcement elements is such that forces acting locally on the backing pad during the intended use of the power tool, to which the backing pad is attached, are absorbed and spread over a larger area of the backing pad. The forces acting on the backing pad are, for example, due to pressure applied by a user on the power tool and thus on the backing pad during intended use of the power tool. This leads to a reduction of static deformation of the backing pad during intended use. Furthermore, the form and the structure of the reinforcement elements is such that vibrations are absorbed to a great extent in all directions, i.e. in the radial, axial and transversal direction. To this end, the reinforcement elements may have a form similar to a noise cancelling wall. This reduces dynamic deformation of the backing pad during intended use.
- Finally, the reinforcement elements and the recesses in between with the resilient material of the damping layer entering into the recesses during manufacture of the backing pad and after curing of the resilient material entirely filling the recesses, provides for a much safer and more reliable attachment of the damping layer to the support layer. With the claimed structure of the bottom surface of the support layer, it is almost impossible that the damping layer will come off the support layer during intended use of the backing pad.
- The reinforcement elements may have any desired three-dimensional form rising from the bottom surface of the support layer into the damping layer and forming recesses in between which are filled by the material of the damping layer. Preferably, the reinforcement elements comprise a plurality of discrete elements which have a larger extension in their base than in their distal end. For example, it is suggested, that the reinforcement elements comprise a plurality of discrete pyramid-shaped elements having a base surface in the form of a circle, a triangle, a rectangle, in particular a square, or any other polygonal form, in particular an equilateral polygonal form.
- Preferably, the plurality of discrete pyramid-shaped elements are provided on the bottom surface of the support layer starting extending in a radial distance in respect to a center region of the support layer up to a circumferential external edge of the support layer. The bottom surface of the center region of the support layer covers the connection element provided on the top surface of the support layer and adapted for connection of the backing pad to a drive shaft or an eccentric element of the polishing or sanding power tool. The bottom surface of the center region is designed essentially smooth and even and in particular does not comprise any reinforcement elements. The bottom surface of the center region may comprise a central hole for passing through a screw or similar connection means from the bottom and fastening it to the connection element thereby securing the backing pad in an axial direction to the drive shaft or the eccentric element of the power tool. The bottom surface of the support layer may comprise a circumferentially extending annularly shaped reinforcement rib extending along the circumferential external edge of the support layer. Preferably, the discrete pyramid-shaped elements are provided on the bottom surface of the support layer starting radially externally from the center region and ending radially internally from the circumferentially extending annularly shaped reinforcement rib.
- It is known from the prior art, to provide the inside surfaces of walls, floor and ceiling of a room or chamber with a plurality of discrete pyramid-shaped elements, in order to reduce the reflection of sound and noise. Such rooms or chambers are used e.g. for effecting audio-acoustic measurements or audio recordings. Due to the form and design of the discrete pyramid-shaped elements, these rooms or chambers have a highly sound-absorbing effect. Sound and noise merely consist of acoustic vibrations in a frequency band audible to the human ear.
- The discrete pyramid-shaped elements provided on the bottom surface of the support layer of the backing pad have a similar vibration-absorbing effect. Mechanical vibrations caused during the intended use of the backing pad or the power tool, respectively, are absorbed by the discrete pyramid-shaped elements provided on the bottom surface of the support layer, similar to the known absorption of acoustic vibrations in a sound-absorbing room or chamber. Furthermore, the vibrations are absorbed at or near to where they are created, i.e. within the backing pad. The absorbed mechanical vibrations do not reach the power tool and, therefore, a user holding the power tool is subjected to considerably less vibrations. Furthermore, less vibrations of the rotating parts of the power tool (i.e. the backing pad with a polishing or sanding member attached thereto) automatically results in less noise during intended use of the power tool because some of the absorbed mechanical vibrations have harmonics in a frequency range audible to the human ear.
- The reinforcement elements may also comprise reinforcement ribs. The exact structure of the bottom surface of the support layer with the reinforcement ribs can have many possible specific designs in order to achieve the desired results and advantages of the invention. For example, the reinforcement ribs may have an at least discrete rotationally symmetric design in respect to a center of the support layer in at least some rotational angles about the center of the support layer. By way of further example, the reinforcement ribs may have a rotationally symmetric design in respect to the center of the support layer in rotational angles of 180° and 360° or 120°, 240° and 360° or 90°, 180°, 270° and 360° or 60°, 120°, 180°, 240°, 300° and 360° or 45°, 90°, 135°, 180°, 225°, 270°, 315° and 360° or 30°, 60°, 90°, 120°, 150°, 180°, 210°, 240°, 270°, 300°, 330° and 360°. Alternatively, the reinforcement ribs may also have a full rotationally symmetric design in respect to the center of the support layer in any rotational angle. The at least discrete rotational symmetry of the reinforcement ribs guarantees a stiffness and flexural rigidity of the support layer and the backing pad, respectively, in different directions.
- The reinforcement ribs could also comprise a plurality of polygonal geometric elements, each element having an essentially polygonal rib design and neighbouring elements being located next to each other and/or offset in respect to each other. The polygonal geometric elements may have any given form, e.g. with triangular, rectangular, square, pentagonal, hexagonal, octagonal, circular, oval external walls protruding from the bottom surface of the support layer and forming the reinforcement ribs. The polygonal geometric elements are preferably evenly distributed on the bottom surface of the support layer. The polygonal geometric elements may be located one immediately next to the other, two neighbouring elements sharing at least part of the same external walls. Alternatively, the polygonal geometric elements may be located spaced apart from each other. Preferably, distances between neighbouring polygonal geometric elements are the same for all polygonal geometric elements.
- The reinforcement ribs may comprise a honeycomb structure with a plurality of external walls forming honeycombs located next to each other, the external walls of each honeycomb forming an essentially equilateral hexagonal rib design and neighbouring honeycombs sharing a common external wall. Such a honeycomb structure has a discrete rotational symmetry in the rotational angles of 180° and 360°. It can provide for a particularly stiff and flexural rigid support layer and backing pad, respectively. Furthermore, the essentially hexagonal recesses in each of the honeycombs provide for a particularly safe, durable and reliable connection between the damping layer and the support layer after curing of the resilient material of the damping layer which during manufacture of the backing pad previously entered into the recesses.
- The reinforcement ribs may comprise a circular cobweb structure extending about a center of the support layer, the cobweb structure having first reinforcement ribs extending in a radial direction from the center of the support layer or parallel to the radial direction and second reinforcement ribs extending in a circumferential direction around the center of the support layer, the second reinforcement ribs running essentially perpendicular to the respective first reinforcement ribs at the points of intersection with the first reinforcement ribs. Of course, if the first reinforcement ribs extend parallel to the radial direction, the second reinforcement ribs will not run exactly perpendicular to the first reinforcement ribs in their points of intersection. Hence, the wording "essentially perpendicular" comprises angles of approximately 50° to 130°., preferably between 70° and 110°. The cob web structure has proved to provide for a particularly stiff and flexural rigid support layer and backing pad, respectively.
- The first reinforcement ribs extending in a radial direction may extend along the entire distance between a center of the support layer and an outer edge of the support layer. Preferably, the reinforcement ribs comprise first reinforcement ribs extending in a radial direction from a center of the support layer or parallel to the radial direction along at least part of a distance between the center of the support layer and an outer edge of the support layer. Hence, the first reinforcement ribs may start in a distance to the center of the support layer and/or end in a distance to the outer edge of the support layer.
- The first reinforcement ribs may be equally spaced apart in respect to each other in a circumferential direction. This provides for reinforcement ribs evenly distributed on the bottom surface of the support layer and for an amount of stiffness and flexural rigidity of the support layer and the backing pad, respectively, evenly distributed in discrete rotational angles about the center of the support layer.
- Furthermore, the reinforcement ribs may comprise second reinforcement ribs extending in a circumferential direction around a center of the support layer. Preferably, the second reinforcement ribs extend coaxially around the center of the support layer. This provides for an even and uniform distribution of the weight of the backing pad in respect to the center of the support layer resulting in a minimum of vibrations during rotation of the backing pad about its rotational axis running through the center of the support layer. Neighbouring second reinforcement ribs may be spaced apart from each other in a radial direction, preferably by an equal distance. Of course, it would also be possible to design the reinforcement rib structure such that neighbouring second circumferential reinforcement ribs towards the center of the support layer have a larger distance than neighbouring second circumferential reinforcement ribs towards the outer edge of the support layer or vice versa.
- Moreover, the reinforcement ribs may comprise third reinforcement ribs which are embodied as circular, semi-circular or oval ribs located at least at some intersection points between radially extending first reinforcement ribs or first reinforcement ribs extending parallel to a radial direction and circumferentially extending second reinforcement ribs, wherein the intersection points form centers of the third reinforcement ribs. The third reinforcement ribs add additional stiffness and flexural rigidity to the support layer and the backing pad, respectively. They could also have the form of any polygon, in particular having more than three sides and corners. For example, the third reinforcement ribs could have the form of a rhombus with four sides and four corners. Of course, towards the center and towards the outer edge of the support layer the third reinforcement ribs may have the form of a semi-circle or a semi-oval.
- The reinforcement rib structure could be designed such that neighbouring third reinforcement ribs touch in a common point or region of external walls forming the third reinforcement ribs. Preferably, the third reinforcement ribs of neighbouring intersection points are spaced apart from each other.
- The reinforcement rib structure could be designed such that at least some of the third reinforcement ribs have a different form and/or diameter. For example, it could be possible that the third reinforcement ribs towards the center of the support layer are smaller than those located towards the outer edge of the support layer. The third reinforcement ribs may have the same form and/or the same diameter throughout the entire bottom surface of the support layer.
- In a top view, the backing pad may have any given form, in particular rectangular or delta-shaped. Those backing pads will not rotate about a central axis of rotation but simply perform a purely orbital working movement. To this end, they would be attached to an orbital polishing or sanding power tool. Preferably, in a top view the backing pad has a circular shape. Such a backing pad may perform a purely orbital, a random-orbital or a roto-orbital (gear driven) working movement depending on the type of polishing or sanding power tool it is attached to.
- As a result of the better stiffness and flexural rigidity of the backing pad according to the invention, it is possible to manufacture the support layer of a less stiff and rigid and possibly cheaper material without losing stiffness and flexural rigidity in respect to the conventional backing pads made without reinforcement ribs but from a stiffer and more rigid material such as glass fibre reinforced plastic material. To this end it is suggested that the support layer is made of plastic material, in particular of a thermoplastic material, with or without reinforcing fibres contained therein. Typical examples for such a thermoplastic material are polyamides, in particular aliphatic polyamides such as nylon polymers. Preferably, a polyacrylamide material such as Ixef® PARA is used for manufacturing the support layer. If desired, but not necessarily, the thermoplastic material, polyamide material or the polyacrylamide material may contain 50-60% fiber reinforcement, in particular glass fiber reinforcement, giving the support layer a remarkable strength and rigidity. Due to the reinforcement ribs the overall thickness of the backing pad may be reduced without any detriment in respect of stiffness and flexural rigidity compared to the conventional backing pads. This is particularly the case, when the plastic material is fiber reinforced.
- Finally, it is suggested that the damping layer is made of polyurethane, in particular a polyurethane foam rubber.
- Manufacturing of the backing pad may be performed in the following manner: First, a connection element for connection of the backing pad to a driving shaft or an eccentric element of a polishing or sanding power tool may be inserted into the bottom of an injection mould. Then, the heated material of the support layer is injected into the injection mould, surrounding at least part of the connection element. The bottom surface of the support layer faces upwards in the injection mould. The reinforcement ribs are created, for example, by closing the injection mould with a lid having channels embodied therein corresponding to the reinforcement ribs. The lid is pressed onto the material of the support layer whereby the material enters into the channels thereby forming the reinforcement ribs. Thereafter, the heated material of the damping layer is injected into the injection mould on top of the bottom surface of the support layer. A lid must be removed previously from the injection mould. Due to the fluid or viscous condition of the heated material of the damping layer, it enters into the recesses between the reinforcement ribs and fills them out completely.
- Finally, the adhesive layer is positioned on the bottom surface of the damping layer. The materials of the backing pad are then cured, possibly under heat supply and/or pressure. After curing of the materials the damping layer is fixedly attached to the bottom surface of the support layer and the adhesive layer is fixedly attached to the bottom surface of the damping layer.
- Further features and advantages of the present invention will be described in further detail hereinafter with reference to the accompanying drawings. Each of the features shown in the drawings and/or described hereinafter may form part of the present invention on its own or in a combination with any of the other features shown in the drawings and/or described hereinafter, provided that the combination falls within the scope of the claims, even if that combination is not shown in the drawings and/or explicitly mentioned in the following description. The drawings show:
- Figure 1
- an embodiment of a backing pad in an exploded perspective view from below;
- Figure 2
- an embodiment of a backing pad according to the present invention in a perspective view from above;
- Figure 3
- a schematic view of a bottom surface of a support layer of an embodiment of a backing pad;
- Figure 4
- a schematic view of a bottom surface of a support layer of an embodiment of a backing pad;
- Figure 5
- a schematic view of a bottom surface of a support layer of an embodiment of a backing pad;
- Figure 6
- a schematic view of a bottom surface of a support layer of an embodiment of a backing pad;
- Figure 7
- a conventional backing pad in a side view during intended use of the backing pad;
- Figure 8
- a conventional backing pad in a side view during intended use of the backing pad;
- Figure 9
- a schematic view of a bottom surface of a support layer of an embodiment of a backing pad;
- Figure 10
- a schematic view of a bottom surface of a support layer of an embodiment of a backing pad according to the present invention; and
- Figure 11
- a schematic view of a bottom surface of a support layer of an embodiment of a backing pad according to the present invention.
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Fig. 1 shows an exploded view of a backing pad orplate 2 for a hand-guided polishing or sanding power tool not forming part of the present invention. The backing pad comprises - a
support layer 4 made of a rigid material, thesupport layer 4 comprising a connection element 6 (seeFig. 2 ) on itstop surface 8 for connection of thebacking pad 2 to a drive shaft or an eccentric element of the polishing or sanding power tool, - a damping
layer 10 made of a resilient material, the dampinglayer 10 being fixedly attached to abottom surface 12 of thesupport layer 4, and - an
adhesive layer 14 for releasable attachment of a polishing or sanding member to thebacking pad 2, theadhesive layer 14 being fixedly attached to abottom surface 16 of the dampinglayer 10. - The
connection element 6 has the form of a recess and has a form which is not rotationally symmetric in respect to a center axis orrotational axis 22 of thebacking pad 2. Thesupport layer 4 has anouter edge 40. The dampinglayer 10 and theadhesive layer 14 may have acentral opening 44. Preferably, theconnection element 6 is made of or comprises a rigid material, for example a plastic material or metal, in particular steel or aluminium. Theadhesive layer 14 may comprise, e.g. a layer of a hook-and-loop fastener, for releasable attachment of a polishing or sanding member to thebacking pad 2. The polishing or sanding member may be, e.g. apolishing pad 42 or a sheet-like sanding paper or sanding fabric. The polishing or sanding member may have a central opening corresponding to thecentral opening 44 of the dampinglayer 10 and theadhesive layer 14. - The
various layers layers various layers backing pad 2, e.g. by co-moulding. This has the advantage that theentire backing pad 2 can be manufactured in a single co-moulding process. Due to the moulding process thevarious layers - Hand-guided polishing or sanding power tools are commonly used in the field of sanding or polishing of surfaces of vehicle bodies, boat or ship hulls or airplane fuselages. Depending on the intended use of the tools, the type of processing and/or the user's preferences, the power tools can be operated electrically (with rechargeable batteries or with mains power supply connection) or pneumatically and they can make the
backing pad 2 perform different types of working movements (e.g. purely rotational, purely orbital, random-orbital or roto-orbital or gear-driven). The polishing or sanding power tools comprise an electric or pneumatic motor with a drive shaft 18 (seeFig. 2 ). Thedrive shaft 18 is connected to anattachment member 20 of the power tool in a torque-proof manner either directly or indirectly, e.g. by means of a bevel gear arrangement and/or a reducer gear arrangement located inside a power tool housing. Theattachment member 20 serves for releasably attaching thebacking pad 2 to the power tool. Theattachment member 20 is designed as an adapter element having an external circumferential form corresponding to the internal circumferential form of the recess of theconnection element 6. Theadapter element 20 can be secured in the recess of theconnection element 6 in an axial direction by means of a screw or the like inserted into a central hole of thebacking pad 2 from below, passing through the hole and screwed into a threaded bore opening into the bottom side of theadapter element 20. The central hole of thebacking pad 2 preferably extends coaxially to thecentral opening 44 of the dampinglayer 10 and theadhesive layer 14. In the manufactured and ready to usebacking pad 2, theconnection element 6 of thesupport layer 4 is preferably located above thecentral opening 44. Although not shown in the figures, the central hole extends through theentire backing pad 2 including thesupport layer 4 and theconnection element 6. - Alternatively, the
attachment member 20 as well as theconnection element 6 of thebacking pad 2 may be designed differently from what is described above. Any possible configuration of interactingattachment member 20 andconnection element 6 is possible. In particular, theattachment element 20 may comprise an external thread, an adapter element and/or an eccentric element. Thebacking pad 2 is releasably attached with itsconnection element 6 to theattachment member 20. - A problem with the
conventional backing pads 2 is the fact that they tend to warp during intended use due to the rather high rotational speeds at which thebacking pads 2 are usually operated and due to an eccentric movement of the backing pad during its intended use, if used with an eccentric power tool effecting a random orbital or a roto-orbital working movement. Warping means that thebacking pad 2 tends to through waves in its plane of extension (seeFigs. 7 and 8 ). This leads to a situation in which thebacking pad 2 or the polishing or sanding member, respectively, does no longer lie evenly with its entire bottom surface on asurface 32 to be worked (seeFigs. 7 and 8 ), resulting in an unsatisfactory efficiency and quality of the working process. Furthermore, in order to reduce the warp effect, thesupport layer 4 ofconventional backing pads 2 is made of a rather expensive glass fibre reinforced plastic material. Finally, under some circumstances the dampinglayer 10 can come off thesupport layer 4. - In order to avoid warping of the
backing pad 2 during its intended use and in order to improve stiffness and flexural rigidity of thebacking pad 2 it is suggested that thebottom surface 12 of thesupport layer 4 is provided with reinforcement elements in the form ofreinforcement ribs bottom surface 12 of thesupport layer 4 is further provided withrecesses 30 formed between and at least partially limited by thereinforcement ribs backing pad 2 the resilient material of the dampinglayer 10 enters into therecesses 30 and after curing of the resilient material entirely fills therecesses 30. - At least partially limited by the
reinforcement ribs recesses 30 are limited to their sides byrespective reinforcement ribs outer edge 40 of thesupport layer 4 or towards thecentral opening 44 of thebacking pad 2, there may be somerecesses 30a which are not limited to all sides byreinforcement ribs recesses 30a are also completely filled with the resilient material of the dampinglayer 10 during manufacturing of thebacking pad 2. - The structure of the
backing pad 2, in particular of itssupport layer 4 with thereinforcement ribs support layer 4 and with it the flexural rigidity of theentire backing pad 2 is significantly enhanced. Thereinforcement ribs backing pad 2 during its intended use. This is in particular true when thebacking pad 2 is operated at rather high rotational speeds of thedrive shaft 18 and when thebacking pad 2 effects an eccentric movement (e.g. random orbital or roto-orbital or gear-driven) during its intended use. In particular, thereinforcement ribs backing pad 2 to through waves in its plane of extension during its intended use (seeFigs. 7 and 8 ). As a result, during intended use of thebacking pad 2 according to the invention thebacking pad 2 lies evenly with its entire bottom surface on thesurface 32 to be worked, resulting in a particularly high efficiency and quality of the polishing or sanding process. The intended use of thebacking pad 2 in the sense of the present invention means that thebacking pad 2 is releasably attached to a polishing or sanding power tool and carries a polishing or sanding member on the bottom surface of theadhesive layer 14 and that the power tool is operated at a speed commonly used for working surfaces of a workpiece (e.g. a vehicle, boat airplane or the like). - Furthermore, due to the better stiffness and flexural rigidity of the
backing pad 2 according to the present invention, thesupport layer 4 does not necessarily have to be made of the rather expensive glass fibre reinforced plastic material. Rather, it is possible to make the support layer of a conventional much cheaper and possibly easier to handle plastic material (e.g. without any reinforcement fibres) and still maintaining an acceptable amount of stiffness and flexural rigidity. This results in a very costefficient backing pad 2 which still has a high amount of stiffness and flexural rigidity. - As a result of the better stiffness and flexural rigidity of the
backing pad 2 according to the invention, it is possible to manufacture thesupport layer 4 of a less stiff and rigid and possibly cheaper material without losing stiffness and flexural rigidity compared to the conventional backing pads made without reinforcement ribs but from a stiffer and more rigid material such as glass fibre reinforced plastic material. To this end it is suggested that thesupport layer 4 is made of plastic material, in particular of a thermoplastic material. Typical examples for such a thermoplastic material are polyamides, in particular aliphatic polyamides such as nylon polymers. Preferably, a polyacrylamide material such as Ixef® PARA is used for manufacturing thesupport layer 4. If desired, but not necessarily, the thermoplastic material, polyamide material or the polyacrylamide material may contain up to 50-60% fiber reinforcement, in particular glass fiber reinforcement, giving the support layer 4 a remarkable strength and rigidity clearly exceeding that of conventional glass fiber reinforced backing pads. - Due to the
reinforcement ribs backing pad 2 may be reduced without any detriment in respect of stiffness and flexural rigidity compared to the conventional backing pads. This is particularly the case, when the plastic material used for thesupport layer 4 does not only have thereinforcement ribs layer 10 is preferably made of polyurethane, in particular a polyurethane foam rubber. - The
reinforcement ribs recesses 30 in between with the resilient material of the dampinglayer 10 entering into therecesses 30 during manufacture of thebacking pad 2 and after curing of the resilient material entirely filling therecesses 30, provides for a much safer and more reliable attachment of the dampinglayer 10 to thesupport layer 4. With the proposed structure of thebottom surface 12 of thesupport layer 4 it is almost impossible that the dampinglayer 10 will come off thesupport layer 4 during intended use of thebacking pad 2. - The structure of the
bottom surface 12 of thesupport layer 4 can have many possible specific designs in order to achieve the desired results and advantages of the invention. According to a preferred embodiment it is suggested that thereinforcement ribs center 34 of thesupport layer 4 in at least some rotational angles about thecenter 34 of the support layer. Therotational axis 22 passes through thecenter 34 of thesupport layer 4. For example, thereinforcement ribs center 34 of thesupport layer 4 in rotational angles of 180° and 360° (see embodiment ofFig. 4 ) or 120°, 240° and 360° or 90°, 180°, 270° and 360° (see embodiment ofFig. 5 ) or 60°, 120°, 180°, 240°, 300° and 360° (see embodiment ofFig. 6 ) or 45°, 90°, 135°, 180°, 225°, 270°, 315° and 360° (see embodiment ofFig. 3 ) or 30°, 60°, 90°, 120°, 150°, 180°, 210°, 240°, 270°, 300°, 330° and 360°. Of course, the reinforcement ribs could also have a full rotationally symmetric design in respect to thecenter 34 of thesupport layer 4 in any rotational angle. The at least discrete rotational symmetry of thereinforcement ribs support layer 4 and thebacking pad 2, respectively, in different directions. - According to an embodiment shown in
Fig. 4 not forming part of the present invention, thereinforcement ribs geometric elements 36, eachelement 36 having an essentially polygonal rib design andneighbouring elements 36 being located next to each other. Alternatively, neighbouringelements 36 could also be offset in respect to each other. The polygonalgeometric elements 36 may have any given form, e.g. with triangular, rectangular, square, pentagonal, hexagonal, octagonal, circular, oval external walls protruding from thebottom surface 12 of thesupport layer 4 and forming thereinforcement ribs geometric elements 36 are preferably evenly distributed on thebottom surface 12 of thesupport layer 4. As shown inFig. 4 , the polygonalgeometric elements 36 may be located one immediately next to the other, two neighbouring elements sharing at least part of the same external walls orribs geometric elements 36 may be located spaced apart from each other. Preferably, distances between neighbouring polygonalgeometric elements 36 are the same for all polygonalgeometric elements 36. - In the embodiment of
Fig. 4 the polygonalgeometric elements 36 each have the hexagonal form of a honeycomb. Allelements 36 together form a honeycomb structure. A plurality of external walls orribs external walls honeycomb 36 forming an essentially equilateral hexagonal rib design. Neighbouringhoneycombs 36 share a commonexternal wall rigid support layer 4 andbacking pad 2, respectively. Furthermore, the essentiallyhexagonal recesses 30 in each of thehoneycombs 36 provide for a particularly safe, durable and reliable connection between the dampinglayer 10 and thesupport layer 4 after curing of the resilient material of the dampinglayer 10 which during manufacture of thebacking pad 2 previously entered into therecesses 30. - According to the embodiment of
Fig. 1 not forming part of the present invention, the reinforcement elements comprisefirst reinforcement ribs 24 extending in a radial direction from acenter 34 of thesupport layer 4. The reinforcement elements further comprisesecond reinforcement ribs 26 having a circular extension extending equidistant to thecenter 34 and perpendicular to thefirst reinforcement ribs 24. -
Recesses 30 are formed between neighbouringfirst reinforcement ribs 24 and neighbouringsecond reinforcement ribs 26. Somerecesses 30a are not limited to all sides byreinforcement ribs - According to another embodiment shown in
Fig. 6 not forming part of the invention, thereinforcement ribs center 34 of thesupport layer 4. The cobweb structure hasfirst reinforcement ribs 24 extending in a radial direction from thecenter 34 of thesupport layer 4 andsecond reinforcement ribs 26 extending in an essentially circumferential direction around thecenter 34 of thesupport layer 4. In this embodiment, thesecond reinforcement ribs 26 have a linear extension extending perpendicular to animaginary radial line 38 running in an equidistant manner between two neighbouringfirst reinforcement ribs 24. Thesecond reinforcement ribs 26 run essentially perpendicular to the respectivefirst reinforcement ribs 24 at the points of intersection with thefirst reinforcement ribs 24. Of course, due to the linear extension of thesecond reinforcement ribs 26 they will not run exactly perpendicular to thefirst reinforcement ribs 24 in their points of intersection. Hence, the wording "essentially perpendicular" comprises angles of approximately 50° to 130°, preferably between 70° and 110°. In the embodiment ofFig. 6 the angle between the first andsecond reinforcement ribs rigid support layer 4 andbacking pad 2, respectively. - According to the embodiment shown in
Fig. 5 not forming part of the invention, thereinforcement ribs first reinforcement ribs 24 extending in a radial direction from acenter 34 of thesupport layer 4 and first reinforcement ribs 24' extending parallel to animaginary line 41 extending in a radial direction. Theimaginary line 41 runs in an equidistant manner between two neighbouringfirst reinforcement ribs 24. Thebottom surface 12 of thesupport layer 4 ofFig. 5 is divided into four separate quadrants by thefirst reinforcement ribs 24. Each quadrant comprises animaginary line 41. The first reinforcement ribs 24' have different extensions depending on the quadrant they are in. In particular, the first reinforcement ribs 24' of a certain quadrant extend parallel to theimaginary line 41 of that quadrant. - The rib structure of
Figs. 1 and5 further comprisessecond reinforcement ribs 26 extending in a circumferential direction around thecenter 34 of thesupport layer 4. In this embodiment, thesecond reinforcement ribs 26 have a circular extension extending perpendicular to thefirst reinforcement ribs 24 and theimaginary radial lines 41 at the respective points of intersection. Thesecond reinforcement ribs 26 do not run exactly perpendicular to the other first reinforcement ribs 24' at the points of intersection. Due to the first reinforcement ribs 24' not extending exactly radially, thesecond reinforcement ribs 26 will not run exactly perpendicular to the first reinforcement ribs 24' in their points of intersection. The closer the first reinforcement rib 24' of a quadrant is to theimaginary radial line 41 of that quadrant, the closer the angle between the first andsecond reinforcement ribs - The
first reinforcement ribs 24 extending in a radial direction may extend along the entire distance between acenter 34 of thesupport layer 4 and anouter edge 40 of thesupport layer 4. Alternatively, thereinforcement ribs first reinforcement ribs 24 extending in a radial direction from acenter 34 of thesupport layer 4 or parallel to the radial direction along at least part of a distance between thecenter 34 of thesupport layer 4 and anouter edge 40 of thesupport layer 4. Hence, thefirst reinforcement ribs 24 may start in a distance to thecenter 34 of thesupport layer 4 and/or end in a distance to theouter edge 40 of thesupport layer 4. - In an embodiment not forming part of the invention, the
first reinforcement ribs 24 are equally spaced apart in respect to each other in a circumferential direction (seeFigs. 1 ,3 ,5 (regarding thefirst ribs 24, not the other first ribs 24'), and 6). This provides forreinforcement ribs 24 evenly distributed on thebottom surface 12 of thesupport layer 4 and for an amount of stiffness and flexural rigidity of thesupport layer 4 and thebacking pad 2, respectively, evenly distributed in discrete rotational angles about thecenter 34 of thesupport layer 4. - The
second reinforcement ribs 26 may extend coaxially around thecenter 34 of thesupport layer 4. This provides for an even and uniform distribution of the weight of thebacking pad 2 in respect to thecenter axis 22 of thesupport layer 4 resulting in a minimum of vibrations during rotation of thebacking pad 2 about itsrotational axis 22 running through thecenter 34 of thesupport layer 4. Neighbouringsecond reinforcement ribs 26 are spaced apart from each other in a radial direction, preferably by an equal distance. Of course, it would also be possible to design the reinforcement rib structure such that neighbouring secondcircumferential reinforcement ribs 26 towards thecenter 34 of thesupport layer 4 have a larger distance than neighbouring secondcircumferential reinforcement ribs 26 towards theouter edge 40 of thesupport layer 4 or vice versa. - Moreover, the
reinforcement ribs third reinforcement ribs 28 which are embodied as circular, semi-circular or oval ribs located at least at some intersection points between radially extending first reinforcement ribs 24 (seeFigs. 3 and6 ) or first reinforcement ribs 24' (seeFig. 5 ) extending parallel to aradial direction 41 and circumferentially extendingsecond reinforcement ribs 26, wherein the intersection points form centers of thethird reinforcement ribs 28. Thethird reinforcement ribs 28 add additional stiffness and flexural rigidity to the support layer 5 and thebacking pad 2, respectively. - In the embodiment of
Fig. 3 not forming part of the present invention thethird reinforcement ribs 28 mostly have a circular shape. The circularthird ribs 28 are located at each point of intersection between the firstradial ribs 24 and the secondcircumferential ribs 26. Of course, towards thecenter 34 and towards theouter edge 40 of thesupport layer 4 thethird reinforcement ribs 28 may have the form of a semi-circle or a semi-oval (seeFig. 3 ). The center of the semi-oval externalthird ribs 28 is constituted by a point of intersection between the firstradial ribs 24 and theouter edge 40 of thesupport layer 4. In the embodiment ofFig. 5 thethird reinforcement ribs 28 all have a circular shape. The circularthird ribs 28 are located only at some points of intersection between the firstradial ribs 24 and the other first ribs 24' extending parallel to a radialimaginary line 41 and at some points of intersection of the other first ribs 24' extending parallel to a radialimaginary line 41 and the secondcircumferential ribs 26. In the embodiment ofFig. 6 thethird reinforcement ribs 28 have an oval shape. The ovalthird ribs 28 are located only at some points of intersection between the firstradial ribs 24 and the second essentiallycircumferential ribs 26. Thethird reinforcement ribs 28 could also have the form of any polygon, in particular a polygon having more than three sides and corners. For example, thethird reinforcement ribs 28 could have the form of a rhombus with four sides and four corners. - The reinforcement rib structure could be designed such that neighbouring
third reinforcement ribs 28 touch in a common point or region of external walls forming thethird reinforcement ribs 28. Preferably, thethird reinforcement ribs 28 of neighbouring intersection points are spaced apart from each other. - The reinforcement rib structure could be designed such that at least some of the
third reinforcement ribs 28 have a different form and/or diameter (seeFig. 3 ). For example, it could be possible that thethird reinforcement ribs 28 towards thecenter 34 of thesupport layer 4 are smaller than those located towards theouter edge 40 of thesupport layer 4. Preferably, thethird reinforcement ribs 28 have the same form and/or the same diameter throughout theentire bottom surface 12 of the support layer 4 (seeFig. 5 ). - In a top view, the
backing pad 2 may have any given form, in particular rectangular or delta-shaped.Such backing pads 2 will not rotate about acentral axis 22 of rotation but simply perform a purely orbital (or eccentric) working movement. To this end, they would be attached to an orbital polishing or sanding power tool. Preferably, in a top view, thebacking pad 2 has a circular shape. Such abacking pad 2 may perform a purely orbital, a random-orbital or a roto-orbital (gear driven) working movement depending on the type of polishing or sanding power tool it is attached to or whether it is fixedly attached directly to adrive shaft 18 of the power tool (seeFig. 2 ) or - possibly in a freely rotatable manner - to an eccentric element which in turn is fixedly attached to thedrive shaft 18 of the power tool. - Manufacturing of the
backing pad 2 may be performed in the following manner: First, aconnection element 6 for connection of thebacking pad 2 to a drivingshaft 18 or an eccentric element of a polishing or sanding power tool may be inserted into the bottom of an injection mould. Then, the heated material of thesupport layer 4 is injected into the injection mould, surrounding at least part of theconnection element 6. Thebottom surface 12 of thesupport layer 4 faces upwards in the injection mould. Thereinforcement ribs reinforcement ribs support layer 4 whereby the material enters into the channels thereby forming thereinforcement ribs layer 10 is injected into the injection mould on top of thebottom surface 12 of thesupport layer 4. If a lid was used for creating thereinforcement ribs layer 10 can be inserted into the injection mould. Due to the fluid or viscous condition of the heated material of the dampinglayer 10, it enters into therecesses 30 between thereinforcement ribs adhesive layer 14 is positioned on thebottom surface 16 of the dampinglayer 10. The materials of thebacking pad 2 are cured, possibly under heat supply and/or pressure. After curing of the materials the dampinglayer 10 is fixedly attached to thebottom surface 12 of thesupport layer 4 and theadhesive layer 14 is fixedly attached to thebottom surface 16 of the dampinglayer 10. -
Fig. 9 shows an embodiment of thebacking pad 2 not making part of the present invention. In order to avoid warping of thebacking pad 2 during its intended use and in order to improve stiffness and flexural rigidity of thebacking pad 2 it is suggested that thebottom surface 12 of thesupport layer 4 is provided with reinforcement elements in the form ofreinforcement ribs bottom surface 12 of thesupport layer 4 is further provided withrecesses 30 formed between and at least partially limited by thereinforcement ribs backing pad 2 the resilient material of the dampinglayer 10 enters into therecesses 30 and after curing of the resilient material entirely fills therecesses 30. In contrast to the previously described embodiments, a surface of thereinforcement ribs bottom surface 12 of thesupport layer 4 towards the dampinglayer 10 does not have an even but rather an undulated extension. In particular, thereinforcement ribs - According to the embodiment of
Fig. 9 , the reinforcement elements comprise a plurality offirst reinforcement ribs 24 extending in a radial direction from acenter 34 of thesupport layer 4. In this embodiment, a total of 18first reinforcement ribs 24 are provided spaced apart from each other by 20° each. The reinforcement elements further comprisesecond reinforcement ribs 26 having a circular extension extending equidistant to thecenter 34 and perpendicular to thefirst reinforcement ribs 24. In this embodiment, a total of threesecond reinforcement ribs 24 are provided.Recesses 30 are formed between neighbouringfirst reinforcement ribs 24 and neighbouringsecond reinforcement ribs 26. Somerecesses 30a are not limited to all sides byreinforcement ribs second reinforcement rib 26 has a surface with an even extension facing away from thebottom surface 12 of thesupport layer 4 towards the dampinglayer 10. -
Fig. 11 shows part of abottom surface 12 of thesupport layer 4 of abacking pad 2 according to the invention, where the reinforcement elements comprise a plurality of discrete pyramid-shapedelements 46 having a base surface in the form of a rectangle, in particular a square. Alternatively, the base surface could also have the form of a circle, a triangle, or any other polygonal form, in particular an equilateral polygonal form. Side surfaces of thediscrete elements 46 converge towards atip 48 facing away from thebottom surface 12 of thesupport layer 4 towards the dampinglayer 10.Recesses 30 are formed between neighbouring discrete pyramid-shapedelements 46. -
Fig. 10 shows part of yet another embodiment of abottom surface 12 of thesupport layer 4 of abacking pad 2 according to the invention, where the reinforcement elements comprise a plurality ofdiscrete elements discrete elements hills 50 protruding from thebottom surface 12 andvalleys 52 in the form of depressions in thebottom surface 12. Thediscrete elements elements 46 ofFig. 11 . To this end, thediscrete elements discrete elements 46 ofFig. 11 , with all edges rounded, in order to form the undulated structure on thebottom surface 12 of thesupport layer 4 of thebacking pad 2. Different to what is shown inFig. 10 , thediscrete elements bottom surface 12 of thesupport layer 4.
Claims (11)
- A backing pad (2) for a hand-guided polishing or sanding power tool, comprising- a support layer (4) made of a rigid material, the support layer (4) comprising a connection element (6) on its top surface (8) for connection of the backing pad (2) to a driving shaft (18) or an eccentric element of the polishing or sanding power tool,- a damping layer (10) made of a resilient material, the damping layer (10) being fixedly attached to a bottom surface (12) of the support layer (4), and- an adhesive layer (14) for releasable attachment of a polishing or sanding member to the backing pad (2), the adhesive layer (14) being fixedly attached to a bottom surface (16) of the damping layer (10),wherein the bottom surface (12) of the support layer (4) is provided with reinforcement elements (24, 26, 28; 46; 50, 52) for enhancing flexural rigidity of the support layer (4), and the bottom surface (12) of the support layer (4) is further provided with recesses (30) formed between and at least partially limited by the reinforcement elements (24, 26, 28; 46; 50, 52),
characterized in that
the reinforcement elements comprise a plurality of discrete pyramid-shaped elements (46; 50, 52) having a base surface in the form of a circle, a triangle, a rectangle, in particular a square, or any other polygonal form, in particular an equilateral polygonal form, wherein during manufacture of the backing pad (2) the resilient material of the damping layer (10) enters into the recesses (30) and after curing of the resilient material entirely fills the recesses (30). - The backing pad (2) according to claim 1, wherein
in a top view the backing pad (2) has a circular shape. - The backing pad (2) according to claim 1 or 2, wherein
the support layer (4) is made of plastic material, in particular a thermoplastic material. - The backing pad (2) according to claim 3, wherein
reinforcing fibres are contained in the plastic material. - The backing pad (2) according to claim 4, wherein
the plastic material contains 50-60% reinforcing fibres. - The backing pad (2) according to claim 4 or 5, wherein
the reinforcing fibres are glass fibers. - The backing pad (2) according to one of the claims 3 to 6, wherein
the plastic material is a polyamide, in particular an aliphatic polyamide such as nylon polymer. - The backing pad (2) according to one of the claims 3 to 6, wherein
the plastic material is a polyacrylamide material, in particular Ixef® PARA. - The backing pad (2) according to one of the preceding claims, wherein
the damping layer (10) is made of polyurethane, in particular a polyurethane foam rubber. - Method for manufacturing a backing pad (2) for a hand-guided polishing or sanding power tool, comprising the steps of- providing an injection mould,- inserting a connection element (8) for connection of the manufactured backing pad (2) to a drive shaft (18) or an eccentric element of a polishing or sanding power tool into the bottom of the injection mould,- injecting heated material of a support layer (4) of the backing pad (2) into the injection mould, surrounding at least part of the connection element (8),- closing the injection mould with a lid having channels embodied therein, the channels corresponding to reinforcement elements (46; 50, 52) to be provided on a bottom surface (12) of the support layer (4),- pressing the lid onto the material of the support layer (4) whereby the material of the support layer (4) enters into the channels thereby forming the reinforcement elements (46; 50, 52),- removing the lid from the injection mold,- injecting heated material of a damping layer (10) of the backing pad (2) into the injection mould on top of the bottom surface (12) of the support layer (4) facing upwards in the injection mould,- positioning an adhesive layer (14) of the backing pad (2) on the bottom surface of the damping layer (10), and- curing the materials of the backing pad (2).
- Method according to claim 10, wherein
curing of the materials of the backing pad (2) is effected under heat supply and/or pressure.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP21161306.2A EP4056316A1 (en) | 2021-03-08 | 2021-03-08 | Backing pad for a hand-guided polishing or sanding power tool |
Publications (2)
Publication Number | Publication Date |
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EP4056317A2 true EP4056317A2 (en) | 2022-09-14 |
EP4056317A3 EP4056317A3 (en) | 2022-11-23 |
Family
ID=74859816
Family Applications (3)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP21161306.2A Pending EP4056316A1 (en) | 2021-03-08 | 2021-03-08 | Backing pad for a hand-guided polishing or sanding power tool |
EP22158633.2A Pending EP4056318A3 (en) | 2021-03-08 | 2022-02-24 | Backing pad for a hand-guided polishing or sanding power tool |
EP22158628.2A Pending EP4056317A3 (en) | 2021-03-08 | 2022-02-24 | Backing pad for a hand-guided polishing or sanding power tool |
Family Applications Before (2)
Application Number | Title | Priority Date | Filing Date |
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EP21161306.2A Pending EP4056316A1 (en) | 2021-03-08 | 2021-03-08 | Backing pad for a hand-guided polishing or sanding power tool |
EP22158633.2A Pending EP4056318A3 (en) | 2021-03-08 | 2022-02-24 | Backing pad for a hand-guided polishing or sanding power tool |
Country Status (5)
Country | Link |
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US (1) | US20220388122A1 (en) |
EP (3) | EP4056316A1 (en) |
JP (1) | JP2022136999A (en) |
KR (1) | KR20220126252A (en) |
CN (1) | CN115106934A (en) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9039496B2 (en) | 2011-12-20 | 2015-05-26 | Kolthoff Gabrovo Eood | Grinding disk |
Family Cites Families (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT1229703B (en) * | 1989-05-11 | 1991-09-07 | Franco Romanini | SANDING TOOL OR SIMILAR. |
US6142858A (en) * | 1997-11-10 | 2000-11-07 | 3M Innovative Properties Company | Backup pad for abrasive articles |
JPH11333696A (en) * | 1998-05-26 | 1999-12-07 | Seiko Epson Corp | Polishing device and polishing method |
KR100387954B1 (en) * | 1999-10-12 | 2003-06-19 | (주) 휴네텍 | Conditioner for polishing pad and method of manufacturing the same |
US20030017291A1 (en) * | 2001-03-14 | 2003-01-23 | Fleming Danny L. | Adhesive layers and release liners with pyramidal structures |
US6755878B2 (en) * | 2002-08-02 | 2004-06-29 | 3M Innovative Properties Company | Abrasive articles and methods of making and using the same |
JP3895256B2 (en) * | 2002-10-11 | 2007-03-22 | Ykk株式会社 | Polishing substrate for portable polishing machine |
DE10357144A1 (en) * | 2003-12-06 | 2005-06-30 | Robert Bosch Gmbh | Sanding pad for a hand grinder |
US8302243B2 (en) * | 2009-08-18 | 2012-11-06 | S.C. Johnson & Son, Inc. | Multi-layer surface treatment pad for motorized device |
JP6529210B2 (en) * | 2013-04-04 | 2019-06-12 | スリーエム イノベイティブ プロパティズ カンパニー | Polishing method using polishing disk and article used therefor |
TWI599447B (en) * | 2013-10-18 | 2017-09-21 | 卡博特微電子公司 | Cmp polishing pad having edge exclusion region of offset concentric groove pattern |
JP6611414B2 (en) * | 2014-05-27 | 2019-11-27 | スリーエム イノベイティブ プロパティズ カンパニー | Paint surface finishing method and polishing material |
EP3028811B1 (en) * | 2014-12-05 | 2017-03-01 | Guido Valentini | Backing pad for a hand guided polishing or sanding tool and hand guided polishing or sanding tool with such a backing pad |
CN106334997A (en) * | 2016-10-20 | 2017-01-18 | 天津华海清科机电科技有限公司 | Polishing head and polisher with same |
JP6580086B2 (en) * | 2017-04-27 | 2019-09-25 | ケヰテック株式会社 | Composite sponge buff |
CN111070080B (en) * | 2019-12-31 | 2022-02-22 | 天津大学 | Surface series processing technology for sub-aperture center liquid supply optical element |
-
2021
- 2021-03-08 EP EP21161306.2A patent/EP4056316A1/en active Pending
-
2022
- 2022-02-24 EP EP22158633.2A patent/EP4056318A3/en active Pending
- 2022-02-24 EP EP22158628.2A patent/EP4056317A3/en active Pending
- 2022-03-01 US US17/683,599 patent/US20220388122A1/en active Pending
- 2022-03-04 CN CN202210207973.7A patent/CN115106934A/en active Pending
- 2022-03-07 JP JP2022034168A patent/JP2022136999A/en active Pending
- 2022-03-08 KR KR1020220029471A patent/KR20220126252A/en not_active Application Discontinuation
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9039496B2 (en) | 2011-12-20 | 2015-05-26 | Kolthoff Gabrovo Eood | Grinding disk |
Also Published As
Publication number | Publication date |
---|---|
JP2022136999A (en) | 2022-09-21 |
EP4056317A3 (en) | 2022-11-23 |
CN115106934A (en) | 2022-09-27 |
EP4056318A3 (en) | 2022-12-14 |
EP4056318A2 (en) | 2022-09-14 |
KR20220126252A (en) | 2022-09-15 |
EP4056316A1 (en) | 2022-09-14 |
US20220388122A1 (en) | 2022-12-08 |
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