CN115106934A - Backing plate for hand polishing or sanding electric tool - Google Patents
Backing plate for hand polishing or sanding electric tool Download PDFInfo
- Publication number
- CN115106934A CN115106934A CN202210207973.7A CN202210207973A CN115106934A CN 115106934 A CN115106934 A CN 115106934A CN 202210207973 A CN202210207973 A CN 202210207973A CN 115106934 A CN115106934 A CN 115106934A
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- Prior art keywords
- support layer
- reinforcing ribs
- reinforcing
- layer
- underlay sheet
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- 238000005498 polishing Methods 0.000 title claims abstract description 40
- 239000010410 layer Substances 0.000 claims abstract description 241
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 211
- 238000013016 damping Methods 0.000 claims abstract description 60
- 239000000463 material Substances 0.000 claims abstract description 47
- 238000005452 bending Methods 0.000 claims abstract description 30
- 239000012790 adhesive layer Substances 0.000 claims abstract description 19
- 239000013013 elastic material Substances 0.000 claims abstract description 14
- 238000004519 manufacturing process Methods 0.000 claims abstract description 13
- 239000012858 resilient material Substances 0.000 claims abstract description 8
- 241000264877 Hippospongia communis Species 0.000 claims description 17
- 229920003023 plastic Polymers 0.000 claims description 8
- 239000004033 plastic Substances 0.000 claims description 8
- 239000012815 thermoplastic material Substances 0.000 claims description 5
- 238000002360 preparation method Methods 0.000 claims 1
- 238000002347 injection Methods 0.000 description 12
- 239000007924 injection Substances 0.000 description 12
- 238000003754 machining Methods 0.000 description 11
- 230000002787 reinforcement Effects 0.000 description 9
- 239000003365 glass fiber Substances 0.000 description 8
- 230000000694 effects Effects 0.000 description 7
- 238000009827 uniform distribution Methods 0.000 description 6
- 229920002430 Fibre-reinforced plastic Polymers 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 239000004952 Polyamide Substances 0.000 description 4
- 238000000465 moulding Methods 0.000 description 4
- 229920002401 polyacrylamide Polymers 0.000 description 4
- 229920002647 polyamide Polymers 0.000 description 4
- 239000000835 fiber Substances 0.000 description 3
- 229920002635 polyurethane Polymers 0.000 description 3
- 239000004814 polyurethane Substances 0.000 description 3
- 239000004953 Aliphatic polyamide Substances 0.000 description 2
- 229920005830 Polyurethane Foam Polymers 0.000 description 2
- 229920003231 aliphatic polyamide Polymers 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 239000011152 fibreglass Substances 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 229920001778 nylon Polymers 0.000 description 2
- 239000011496 polyurethane foam Substances 0.000 description 2
- 239000005060 rubber Substances 0.000 description 2
- 229920001169 thermoplastic Polymers 0.000 description 2
- 239000004416 thermosoftening plastic Substances 0.000 description 2
- 241000239290 Araneae Species 0.000 description 1
- 101100491335 Caenorhabditis elegans mat-2 gene Proteins 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000012783 reinforcing fiber Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
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
-
- 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
-
- 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
-
- 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
- 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
The present invention relates to a pad for a hand-operated polishing or sanding power tool, comprising: a support layer made of a rigid material, the support layer including attachment elements on a top surface thereof for attaching the pad to a drive shaft or eccentric element of a polishing or sanding power tool; a damping layer made of an elastic material, the damping layer being fixedly attached to the bottom surface of the support layer; and an adhesive layer for detachably attaching the polishing or sanding member to the pad, the adhesive layer being fixedly attached to the bottom surface of the damping layer. It is proposed that the bottom surface of the support layer is provided with reinforcing elements for reinforcing the bending stiffness of the support layer, and that the bottom surface of the support layer is further provided with grooves formed between and at least partly bounded by the reinforcing elements, wherein during manufacture of the underlay sheet the resilient material of the damping layer enters the grooves and completely fills the grooves after the resilient material has cured.
Description
Technical Field
The present invention relates to a pad for a hand-operated polishing or sanding power tool, comprising:
a support layer made of a rigid material, said support layer comprising on its top surface attachment elements for attaching the pad to a drive shaft or eccentric element of a polishing or sanding power tool,
-a damping layer made of an elastic material, the damping layer being fixedly attached to the bottom surface of the support layer, an
-an adhesive layer for removably attaching the polishing or sanding member to the backing plate, the adhesive layer being fixedly attached to the bottom surface of the damping layer.
Background
Hand-operated polishing or sanding power tools are commonly used in the field of sanding or polishing of surfaces of vehicle bodies, boats, ship hulls, or aircraft fuselage. The power tool may be operated electrically (with rechargeable batteries or with a mains connection point) or pneumatically, depending on the intended use of the tool, the type of process and/or the preferences of the user. Polishing or sanding power tools include an electric or pneumatic motor with a drive shaft. The drive shaft is connected to the attachment member in a torque-proof manner (e.g. by a bevel gear arrangement and/or a reducer gear arrangement) or directly or indirectly. The attachment member may comprise an external thread, an adapter element and/or an eccentric element. The shim plate is attached with its connecting elements in a detachable manner to the attachment member. Known tie plates comprise a rigid support layer, typically made of a glass fibre reinforced plastic material, which comprises on its top surface connecting elements for detachable attachment to a power tool. A damping layer made of an elastic material, such as polyurethane, is fixedly attached to the bottom surface of the support layer, for example by co-moulding. In the prior art, the bottom surface of the support layer is a uniform surface. Attached to the bottom surface of the damping layer is an adhesive layer (e.g., including hook and loop fasteners) for removably attaching a polishing or sanding member, such as a polishing pad or sheet sandpaper or sanding cloth.
A problem with conventional tie plates is that they tend to warp during their intended use if used with eccentric power tools that effect random orbital or rotary orbital machining movements, since tie plates are typically operated at relatively high rotational speeds, and since they move eccentrically during their intended use. Warping means that the shim plate tends to undulate in its plane of extension. This leads to a situation in which the pad or the polishing or sanding member, respectively, is no longer uniformly located over its entire bottom surface on the surface to be machined, resulting in an unsatisfactory efficiency and quality of the machining process. Furthermore, in order to reduce the buckling effect, the support layer of conventional mats is made of a rather expensive glass fiber reinforced plastic material. Finally, in some cases, the damping layer may be detached from the support layer.
It is therefore an object of the present invention to provide a tie plate with increased stiffness and bending stiffness without increasing the total weight of the tie plate, the attachment of the damping layer of the tie plate to the support layer being safer and tighter and at the same time more cost-effective than the known tie plates.
Disclosure of Invention
To solve this object, a shim plate with the features of claim 1 is proposed. In particular, starting from a shim plate of the kind described above, it is proposed that the bottom surface of the support layer is provided with reinforcing elements for reinforcing the bending stiffness of the support layer, and that the bottom surface of the support layer is further provided with grooves formed between and at least partly bounded by said elements, wherein during the manufacture of the shim plate the resilient material of the damping layer enters the grooves and completely fills said grooves after the resilient material has cured.
The structure of the claimed tie plate, in particular of its supporting layer, has the advantage that the hardness of the supporting layer and thus the bending stiffness of the entire tie plate are significantly increased. The reinforcing element significantly reduces the buckling effect of the previously described shim plate during the intended use. This is particularly true when the pad is operated at relatively high rotational speeds, and when the pad is eccentrically displaced during its intended use. In particular, the reinforcing element significantly reduces the tendency of the underlay sheet to undulate in its plane of extension during its intended use. Thus, during the intended use of the pad, the pad lies with its entire bottom surface uniformly on the surface to be processed, so that the efficiency and quality of the polishing or sanding process is particularly high. The intended use of the underlay sheet in the sense of the invention means: the 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 the power tool operates at speeds commonly used to machine the surface of a workpiece (e.g., a vehicle, boat, or airplane, etc.).
The reduction of the buckling effect and the higher stiffness of the underlay sheet is mainly caused by a better, more secure intervention and mechanical anchoring between the damping layer and the support layer of the underlay sheet. This is due to the fact that the reinforcing elements of the supporting layer are immersed in the damping layer and are completely surrounded by the solidified material of the damping layer.
Furthermore, due to the better stiffness and bending stiffness of the underlay sheet according to the invention, the support layer does not necessarily have to be made of a rather expensive glass fibre reinforced plastic material. Instead, the support layer can be made of a conventional cheaper and possibly more easily handled plastic material, and still maintain an acceptable stiffness and bending rigidity. This results in a very cost-effective shim plate which still has a high stiffness and bending stiffness.
In the tie plate according to the invention, it is particularly advantageous that, due to the three-dimensional extension of the reinforcing elements on the bottom surface of the supporting layer and the material of the damping layer entering the grooves provided between the reinforcing elements, the interconnection between the damping layer and the supporting layer is effective not only in a two-dimensional horizontal plane extending between the extension of the supporting layer and the damping layer, but also in three dimensions. This significantly reduces the twisting of the shim plate during the intended use. The form and structure of the reinforcing element are such that: during the intended use of the power tool to which the pad is attached, the forces acting locally on the pad are absorbed and distributed over a larger area of the pad. For example, the force acting on the bolster plate is due to the pressure exerted by the user on the power tool, and thus on the bolster plate, during the intended use of the power tool. This results in reduced static deformation of the shim plate during intended use. Furthermore, the form and structure of the reinforcing element are such that: the vibrations are absorbed to a large extent in all directions, i.e. in radial, axial and transverse directions. To this end, the reinforcing element may have a form similar to an acoustic wall. This reduces dynamic deformation of the shim plate during intended use.
Finally, the reinforcing elements and the grooves therebetween, wherein the elastic material of the damping layer enters the grooves during the manufacturing of the underlay sheet and fills the grooves completely after the elastic material has cured, provide a safer and more reliable attachment of the damping layer to the support layer. Due to the claimed structure of the bottom surface of the support layer, it will be almost impossible for the damping layer to detach from the support layer during the intended use of the underlay sheet.
The reinforcing elements may have any desired three-dimensional form that rises from the bottom surface of the support layer into the damping layer and forms grooves therebetween that are filled with the material of the damping layer. Preferably, the reinforcing element comprises a plurality of discrete elements having a greater extension at their base than at their distal ends. For example, it is proposed that the reinforcing element comprises: a plurality of discrete pyramidal elements having a base surface in the form of a circle, a triangle, a rectangle (in particular a square) or any other polygon (in particular an equilateral polygon).
Alternatively, it is proposed that the reinforcing element comprises reinforcing ribs. The precise configuration of the bottom surface of the support layer with the reinforcing ribs may have many possible specific designs to achieve the desired results and advantages of the present invention. According to a preferred embodiment of the invention, it is proposed that the reinforcing ribs have a rotationally symmetrical design with respect to the center of the support layer at least discrete over at least some rotation angles about the center of the support layer. For example, the reinforcing ribs may have a rotationally symmetrical design with respect to the center of the support layer, the rotation angle being 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 reinforcing ribs may also have a fully rotationally symmetrical design with respect to the center of the support layer at any rotational angle. The at least discrete rotational symmetry of the reinforcing ribs ensures the stiffness and bending stiffness of the support layer and the backing plate, respectively, in different directions.
According to a preferred embodiment of the invention, it is proposed that the reinforcing ribs comprise a plurality of polygonal geometric elements, each element having a substantially polygonal rib design, and that adjacent elements are positioned adjacent to each other and/or offset from each other. The polygonal geometric elements may have any given form, for example, with triangular, rectangular, square, pentagonal, hexagonal, octagonal, circular, oval outer walls that protrude from the bottom surface of the support layer and form reinforcing ribs. The polygonal geometric elements are preferably evenly distributed over the bottom surface of the support layer. The polygonal geometric elements may be positioned one next to the other, two adjacent elements sharing at least a portion of the same outer wall. Alternatively, the polygonal geometric elements may be positioned spaced apart from each other. Preferably, the distance between adjacent polygonal geometric elements is the same for all polygonal geometric elements.
According to another preferred embodiment of the invention, it is suggested that the reinforcing ribs comprise a honeycomb structure having a plurality of outer walls forming a honeycomb, the outer walls being positioned adjacent to each other, the outer walls of each honeycomb forming a rib design of substantially equilateral hexagons, and the adjacent honeycombs sharing a common outer wall. Such honeycomb structures have discrete rotational symmetries at rotational angles of 180 ° and 360 °. It may provide a rigid support layer and a backing plate, respectively, which are particularly hard and resistant to bending. Furthermore, the substantially hexagonal recesses in each honeycomb provide a particularly safe, durable and reliable connection between the damping layer and the support layer after the curing of the elastic material of the damping layer, which has been pre-inserted into the recesses during the manufacture of the underlay sheet.
According to a further preferred embodiment of the invention, it is proposed that the reinforcing ribs comprise a circular spider-web structure extending around the centre of the supporting layer, said spider-web structure having: first reinforcing ribs extending in a radial direction from a center of the support layer or extending parallel to the radial direction; and second reinforcing ribs extending in a circumferential direction around a center of the support layer, the second reinforcing ribs extending substantially perpendicular to the respective first reinforcing ribs at intersections with the first reinforcing ribs. Of course, if the first reinforcing rib extends parallel to the radial direction, the second reinforcing rib does not extend exactly perpendicular to the first reinforcing rib at its intersection point. Thus, the term "substantially perpendicular" includes angles of substantially 50 ° to 130 °, preferably between 70 ° and 110 °. It has been shown that the spider-web structure provides a particularly stiff backing layer and a backing plate, respectively, which are particularly stiff and resistant to bending.
The first reinforcing ribs extending in the radial direction may extend along the entire distance between the center of the support layer and the outer edge of the support layer. Preferably, the reinforcing ribs comprise first reinforcing ribs extending in a radial direction from the centre of the support layer or parallel to the radial direction along at least a part of the distance between the centre of the support layer and the outer edge of the support layer. Thus, the first reinforcing ribs may start at a distance from the centre of the support layer and/or end at a distance from the outer edge of the support layer.
Preferably, the first reinforcing ribs are equally spaced relative to each other in the circumferential direction. This provides a uniform distribution of the reinforcing ribs on the bottom surface of the support layer and provides a certain amount of stiffness and bending stiffness of the support layer and the pad plate, respectively, with a uniform distribution at discrete angles of rotation about the center of the support layer.
Furthermore, it is proposed that the reinforcing ribs comprise second reinforcing ribs extending in the circumferential direction around the center of the supporting layer. Preferably, the second reinforcing rib extends coaxially around the centre of the support layer. This provides an even and uniform distribution of the weight of the shim plate relative to the centre of the support layer, thereby minimising vibration during rotation of the shim plate about its axis of rotation through the centre of the support layer. Adjacent second reinforcing ribs are spaced apart from each other in the radial direction, preferably at equal distances from each other. Of course, it is also possible to design the reinforcing rib structure such that adjacent second circumferential reinforcing ribs towards the centre of the support layer have a larger distance than adjacent second circumferential reinforcing ribs towards the outer edge of the support layer, and vice versa.
Furthermore, it is proposed that the reinforcing ribs comprise third reinforcing ribs which are realized as: circular, semicircular or elliptical ribs located at least some of the intersections between the radially extending first reinforcing ribs or first reinforcing ribs extending parallel to the radial direction and the circumferentially extending second reinforcing ribs, wherein these intersections form the center of the third reinforcing ribs. The third reinforcing ribs add additional stiffness and bending stiffness to the support layer and the backing plate, respectively. They may also have the form of any polygon, in particular with more than three sides and corners. For example, the third reinforcing ribs may have a diamond-shaped form having four sides and four corners. Of course, the third reinforcing ribs may have a semicircular or semi-elliptical form towards the centre of the supporting layer and towards the outer edge of the supporting layer.
The reinforcement rib structure may be designed such that adjacent third reinforcement ribs contact a common point or region of the outer wall forming the third reinforcement ribs. Preferably, the third reinforcing ribs of adjacent intersections are spaced apart from each other.
The reinforcing rib structure may be designed such that at least some of the third reinforcing ribs have a different form and/or diameter. For example, the third reinforcing ribs toward the center of the support layer may be smaller than the third reinforcing ribs positioned toward the outer edge of the support layer. Preferably, the third reinforcing ribs have the same form and/or the same diameter over the entire bottom surface of the support layer.
The shim plate can have any given form, in particular rectangular or triangular, in plan view. These pads will not rotate about the central axis of rotation but will only perform a pure orbital machining movement. To do so, they would be attached to a rail polishing or sanding power tool. Preferably, the shim plate has a circular shape in top view. Such a pad may perform a pure orbital, random orbital, or rotary orbital (gear driven) machining movement depending on the type of polishing or sanding power tool to which it is attached.
Due to the better stiffness and bending stiffness of the underlay sheet according to the invention, the support layer can be manufactured from a material having a lower stiffness and rigidity and possibly less expensive, without losing stiffness and bending stiffness, compared to a conventional underlay sheet without reinforcing ribs but made of a harder, stiffer material, such as a glass fiber reinforced plastic material. For this purpose, it is proposed that the support layer is made of a plastic material, in particular a thermoplastic material, with or without reinforcing fibers. Typical examples of such thermoplastic materials are polyamides, in particular aliphatic polyamides, such as nylon polymers. Preferably, use is made of
The polyacrylamide material of PARA makes the support layer. Such asIf desired (but not necessarily), the thermoplastic, polyamide or polyacrylamide material may contain 50-60% of fibrous reinforcement, in particular glass fiber reinforcement, giving the support layer significant strength and rigidity. Due to the reinforcing ribs, the overall thickness of the pallet can be reduced compared to conventional pallets without compromising stiffness and bending rigidity. This is particularly the case when the plastic material is a fibre reinforced material.
Finally, it is proposed that the damping layer is made of polyurethane, in particular polyurethane foam rubber.
The manufacturing of the shim plate may be performed in the following manner: first, a connecting member for connecting a pad plate to a driving shaft or an eccentric member of a polishing or sanding power tool may be inserted into the bottom of an injection mold. The heated material of the support layer is then injected into an injection mold, surrounding at least a portion of the connecting element. The bottom surface of the support layer faces upward in the injection mold. The reinforcing ribs are created, for example, by closing the injection mold with a cap having channels embedded therein corresponding to the reinforcing ribs. The cover is pressed against the material of the support layer, from which material enters the channels, thereby forming the reinforcing ribs. Thereafter, the heating material of the damping layer is injected into an injection mold on top of the bottom surface of the support layer. The cap must be removed from the injection mold in advance. Due to the fluid or viscous condition of the heated material of the damping layer, it enters the grooves between the reinforcing ribs and completely fills them. Finally, an adhesive layer is positioned on the bottom surface of the damping layer. The material of the shim plate may then be cured under heat and/or pressure. After the material is cured, 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.
Drawings
Further features and advantages of the invention are described in more detail below with reference to the accompanying drawings. Each feature shown in the drawings and/or described below may form a part of the invention either alone or in any possible combination with any other feature shown in the drawings and/or described below even if the combination is not shown in the drawings and/or explicitly mentioned below. The drawings show:
fig. 1 is an exploded perspective view of an embodiment of a shim plate according to the present invention, seen from below;
FIG. 2 is a perspective view from above of an embodiment of a shim plate according to the present invention;
FIG. 3 is a schematic view of the bottom surface of the support layer of an embodiment of a pallet according to the present invention;
FIG. 4 is a schematic view of the bottom surface of the support layer of an embodiment of a pallet according to the present invention;
FIG. 5 is a schematic view of the bottom surface of the support layer of an embodiment of a pallet according to the present invention;
FIG. 6 is a schematic view of the bottom surface of the support layer of an embodiment of a pallet according to the present invention;
FIG. 7 is a side view of a conventional tie plate during its intended use;
FIG. 8 is a side view of a conventional tie plate during its intended use;
FIG. 9 is a schematic view of the bottom surface of the support layer of an embodiment of a pallet according to the present invention;
FIG. 10 is a schematic view of the bottom surface of the support layer of an embodiment of a pallet according to the present invention; and
fig. 11 is a schematic view of the bottom surface of the support layer of an embodiment of a pallet according to the present invention.
Detailed Description
Fig. 1 shows an exploded view of a pad 2 for a hand-operated polishing or sanding power tool. The backing plate includes:
a supporting layer 4 made of rigid material, the supporting layer 4 comprising on its top surface 8 attachment elements 6 (see figure 2) for attaching the pad 2 to a drive shaft or eccentric element of a polishing or sanding power tool,
a damping layer 10 made of an elastic material, the damping layer 10 being fixedly attached to a bottom surface 12 of the support layer 4, and
an adhesive layer 14 for removably attaching a polishing or sanding member to the backing plate 2, the adhesive layer 14 being fixedly attached to the bottom surface 16 of the damping layer 10.
The connecting element 6 has a grooved form and has a rotationally symmetrical form with respect to a central or rotational axis 22 of the shim plate 2. The support layer 4 has an outer edge 40. The damping layer 10 and the adhesive layer 14 may have a central opening 44. Preferably, the connecting element 6 is made of or comprises a rigid material, such as a plastic material or a metal, in particular steel or aluminum. The adhesive layer 14 may include: for example, a layer of hook and loop fasteners for removably attaching a polishing or sanding member to the backing plate 2. The polishing or sanding member may be, for example, a polishing pad 42 or a sheet of sandpaper or sanded fabric. The polishing or sanding member may have a central opening corresponding to the central opening 44 of the damping layer 10 and the adhesive layer 14.
After the individual layers 4, 10, 14 are manufactured separately, preferably the individual layers 4, 10, 14 are not attached to each other, for example by gluing or welding. Instead, it is preferred that the individual layers 4, 10, 14 are attached to each other during the manufacture of the underlay sheet 2, for example by co-moulding. This has the advantage that the entire shim plate 2 can be manufactured in one co-moulding process. Due to the molding process, the individual layers 4, 10, 14 are attached to each other in a particularly robust manner.
Hand-operated polishing or sanding power tools are commonly used in the field of sanding or polishing of surfaces of vehicle bodies, boats, ship hulls, or airplane fuselages. Depending on the intended use of the tool, the type of machining and/or user preferences, the power tool may be electrically (with rechargeable batteries or with a mains power connection point) or pneumatically operated, which may cause the shim plate 2 to perform different types of machining movements (e.g. pure rotation, pure orbital, random orbital or rotary orbital or gear drive). The polishing or sanding power tool includes an electric or pneumatic motor with a drive shaft 18 (see fig. 2). The drive shaft 18 is connected to an attachment member 20 of the power tool in a torque proof manner (e.g. by a bevel gear arrangement and/or a speed reducer gear arrangement located in the housing of the power tool) or directly or indirectly. The attachment member 20 is used to detachably attach the pad 2 to the power tool. The attachment member 20 is designed as an adapter element having an outer circumferential form corresponding to the inner circumferential form of the groove of the connecting element 6. The adapter element 20 can be fixed in the axial direction in the recess 6 by means of a screw or the like inserted from below into the central hole of the shim plate 2, which screw or the like passes through the hole and is screwed into a threaded hole opening in the underside of the adapter element 20. The central bore of the backing plate 2 preferably extends coaxially to the central opening 44 of the damping layer 10 and the adhesive layer 14. In the tie plate 2, which is manufactured and ready for use, the connecting elements 6 of the supporting layer 4 are preferably located above the central opening 44. Although not shown in the drawings, the central hole extends through the entire mat 2 including the support layer 4 and the connecting element 6.
Alternatively, the attachment member 20 and the connecting element 6 of the underlay sheet 2 may be designed differently than described above. Any possible configuration of the reciprocal attachment member 20 and the connecting element 6 is possible. In particular, the attachment member 20 may comprise an external thread, an adapter element and/or an eccentric element. The underlay sheet 2 is attached with its connecting element 6 in a detachable manner to the attachment member 20.
A problem with conventional shim plates 2 is that they tend to warp during their intended use if used with eccentric power tools that effect random orbital or rotary orbital machining movements, since shim plates 2 are typically operated at relatively high rotational speeds, and due to the eccentric movement of the shim plates during their intended use. Warping means that the underlay sheet 2 tends to undulate in its plane of extension (see fig. 7 and 8). This leads to a situation in which the pad 2 or the polishing or sanding member, respectively, no longer lies uniformly with its entire bottom surface on the surface 32 to be machined (see fig. 7 and 8), resulting in an unsatisfactory efficiency and quality of the machining process. Furthermore, in order to reduce the buckling effect, the support layer 4 of the conventional underlay sheet 2 is made of a rather expensive glass fibre reinforced plastic material. Finally, in some cases, the damping layer 10 may be detached from the support layer 4.
In order to avoid warping of the shim plate 2 during its intended use and to increase the stiffness and bending rigidity of the shim plate 2, it is proposed that the bottom surface 12 of the support layer 4 is provided with reinforcing elements in the form of reinforcing ribs 24, 26, 28, and that the bottom surface 12 of the support layer 4 is further provided with recesses 30 formed between the reinforcing ribs 24, 26, 28 and at least partially bounded by the reinforcing ribs 24, 26, 28, wherein during manufacture of the shim plate 2 the resilient material of the damping layer 10 enters the recesses 30 and completely fills the recesses 30 after the resilient material has cured.
Being at least partially bounded by reinforcing ribs 24, 26, 28 means that the majority of grooves 30 are bounded on their sides by the respective reinforcing ribs 24, 26, 28. However, in particular towards the outer edge 40 of the supporting layer 4 or towards the central opening 44 of the underlay sheet 2, there may be some recesses 30a, which recesses 30a are not limited to the reinforcing ribs 24, 26, 28 on all sides, but open towards the outside/environment. These grooves 30a are also completely filled by the elastic material of the damping layer 10 during the manufacture of the underlay sheet 2.
The construction of the underlay sheet 2, in particular its support layer 4 with reinforcing ribs 24, 26, 28, has the advantage that the stiffness of the support layer 4 and thus the bending stiffness of the entire underlay sheet 2 is significantly increased. The reinforcing ribs 24, 26, 28 significantly reduce the effect of warping of the underlay sheet 2 during its intended use. This is especially true when the shim plate 2 is operated at a relatively high rotational speed of the drive shaft 18 and when the shim plate 2 is eccentrically moved during its intended use, for example by a random or rotary orbital or gear drive. In particular, the reinforcing ribs 24, 26, 28 significantly reduce the tendency of the shim plate 2 to undulate in its plane of extension during its intended use (see fig. 7 and 8). Thus, during the intended use of the pad 2 according to the invention, the pad 2 lies with its entire bottom surface uniformly on the surface 32 to be machined, so that the efficiency and quality of the polishing or sanding process is particularly high. The intended use of the backing plate 2 in the sense of the present invention means that the backing plate 2 is removably attached to a polishing or sanding power tool and carries a polishing or sanding member on the bottom surface of the adhesive layer 14, and the power tool is operated at speeds commonly used for machining the surface of a workpiece, such as a vehicle, boat or airplane, etc.
Furthermore, due to the better stiffness and bending stiffness of the underlay sheet 2 according to the invention, the support layer 4 does not necessarily have to be made of a rather expensive glass fibre reinforced plastic material. Instead, the support layer can be made of a conventional cheaper and possibly more easily handled plastic material (e.g. without any reinforcing fibres) and still maintain an acceptable stiffness and bending rigidity. This results in a very cost-effective and efficient pallet 2 which still has a high stiffness and bending rigidity.
Due to the better stiffness and bending stiffness of the underlay sheet 2 according to the invention, the support layer 4 can be manufactured from a material having lower stiffness and rigidity and possibly less expensive than a conventional underlay sheet without reinforcing ribs but made of a harder, stiffer material, such as a glass fibre reinforced plastic material, without losing stiffness and bending stiffness. For this purpose, it is proposed that the support layer 4 be made of a plastic material, in particular a thermoplastic material. Typical examples of such thermoplastic materials are polyamides, in particular aliphatic polyamides, such as nylon polymers. Preferably, use is made of
The polyacrylamide material of PARA makes the support layer 4. If desired (but not necessarily), the thermoplastic, polyamide or polyacrylamide material may contain up to 50-60% of fibre reinforcement, in particular glass fibre reinforcement, giving the support layer 4 a significant strength and stiffness which significantly exceeds that of conventional glass fibre reinforced mats.
Due to the reinforcing ribs 24, 26, 28, the overall thickness of the pallet 2 can be reduced compared to conventional pallets without compromising stiffness and bending rigidity. This is particularly the case when the plastic material used for the support layer 4 has not only reinforcing ribs 24, 26, 28 but also fibre reinforcement. The damping layer 10 is preferably made of polyurethane, in particular polyurethane foam rubber.
The reinforcing ribs 24, 26, 28 and the grooves 30 in between, wherein the elastic material of the damping layer 10 enters the grooves 30 during the manufacture of the underlay sheet 2 and completely fills the grooves 30 after the elastic material has cured, provide a safer and more reliable attachment of the damping layer 10 to the support layer 4. Due to the proposed structure of the bottom surface 12 of the support layer 4, the damping layer 10 is less likely to detach from the support layer 4 during the intended use of the underlay sheet 2.
The configuration of the bottom surface 12 of the support layer 4 may have many possible specific designs to achieve the desired results and advantages of the present invention. According to a preferred embodiment it is proposed that the reinforcing ribs 24, 26, 28 have an at least discrete rotationally symmetrical design with respect to the center 34 of the support layer 4 at least some rotational angles around the center 34 of the support layer. The axis of rotation 22 passes through the centre 34 of the support layer 4. For example, the reinforcing ribs 24, 26, 28 may have a rotationally symmetrical design with respect to the center 34 of the support layer 4, the rotation angle being 180 ° and 360 ° (see the embodiment of fig. 4), or 120 °, 240 ° and 360 °, or 90 °, 180 °, 270 ° and 360 ° (see the embodiment of fig. 5), or 60 °, 120 °, 180 °, 240 °, 300 ° and 360 ° (see the embodiment of fig. 6), or 45 °, 90 °, 135 °, 180 °, 225 °, 270 °, 315 ° and 360 ° (see the embodiment of fig. 3), or 30 °, 60 °, 90 °, 120 °, 150 °, 180 °, 210 °, 240 °, 270 °, 300 °, 330 ° and 360 °. Of course, the reinforcing ribs can also have a fully rotationally symmetrical design with respect to the center 34 of the support layer 4 at any rotational angle. At least the discrete rotational symmetry of the reinforcing ribs 24, 26, 28 ensures the stiffness and the bending stiffness of the support layer 4 and the tie plate 2, respectively, in different directions.
According to a preferred embodiment of the invention, shown in fig. 4, it is proposed that the reinforcing ribs 24, 26, 28 form a plurality of polygonal geometric elements 36, each element 36 having a substantially polygonal rib design, and that adjacent elements 36 are positioned adjacent to each other. Alternatively, adjacent elements 36 may also be offset relative to each other. The polygonal geometric elements 36 can have any given form, for example, with triangular, rectangular, square, pentagonal, hexagonal, octagonal, circular, oval outer walls which project from the bottom surface 12 of the supporting layer 4 and form the reinforcing ribs 24, 26, 28. The polygonal geometric elements 36 are preferably evenly distributed on the bottom surface 12 of the support layer 4. As shown in fig. 4, the polygonal geometric elements 36 may be positioned one next to the other, two adjacent elements sharing at least a portion of the same outer wall or rib 24, 26, 28, respectively. Alternatively, the polygonal geometric elements 36 may be positioned spaced apart from each other. Preferably, the distance between adjacent polygonal geometric elements 36 is the same for all polygonal geometric elements 36.
In the embodiment of fig. 4, the polygonal geometric elements 36 each have the hexagonal form of a honeycomb. All of the elements 36 together form a honeycomb structure. The plurality of outer walls or ribs 24, 26, 28, respectively, forming the honeycomb are positioned adjacent to one another, with the outer walls 24, 26, 28 of each honeycomb 36 forming a substantially equilateral hexagonal rib design. Adjacent honeycombs 36 share a common outer wall 24, 26, 28. Such honeycomb structures have discrete rotational symmetries at rotational angles of 180 ° and 360 °. It may provide a particularly stiff and bending-resistant rigid support layer 4 and backing plate 2, respectively. Furthermore, the substantially hexagonal grooves 30 in each honeycomb 36 provide a particularly safe, durable and reliable connection between the damping layer 10 and the supporting layer 4 after the curing of the elastic material of the damping layer 10, which has been pre-inserted into the grooves 30 during the manufacture of the underlay sheet 2.
According to the embodiment of fig. 1, the reinforcing element comprises a first reinforcing rib 24 extending in a radial direction from the centre 34 of the support layer 4. The reinforcing element further comprises a second reinforcing rib 26 having a circular extension extending equidistant from the centre 34 and perpendicular to the first reinforcing rib 24. Grooves 30 are formed between adjacent first reinforcing ribs 24 and adjacent second reinforcing ribs 26. Some of grooves 30a are not limited to reinforcing ribs 24, 26 on all sides, but are open to the outside/environment.
According to another preferred embodiment of the invention, shown in fig. 6, it is proposed that the reinforcing ribs 24, 26, 28 form a circular spider-web structure extending around the centre 34 of the supporting layer 4. The spider web structure has: first reinforcing ribs 24 extending in a radial direction from the center 34 of the support layer 4; and a second reinforcing rib 26 extending in a substantially circumferential direction around the center 34 of the support layer 4. In this embodiment, the second reinforcing ribs 26 have a linear extension extending perpendicular to an imaginary radial line 38, the imaginary radial line 38 extending in an equidistant manner between two adjacent first reinforcing ribs 24. Second reinforcing ribs 26 extend substantially perpendicular to respective first reinforcing ribs 24 at the intersection with first reinforcing ribs 24. Of course, due to the linear extension of the second reinforcing ribs 26, they are not exactly perpendicular to the first reinforcing ribs 24 at their intersection points. Thus, the term "substantially perpendicular" includes angles of substantially 50 ° to 130 °, preferably between 70 ° and 110 °. In the embodiment of fig. 6, the angle between first stiffening ribs 24 and second stiffening ribs 26 is about 60 °. It has been found that the spider-web structure provides a particularly stiff and bending-resistant rigid support layer 4 and backing plate 2, respectively.
According to the embodiment shown in fig. 5, reinforcing ribs 24, 26, 28 comprise: first reinforcing ribs 24 extending in a radial direction from a center 34 of the support layer 4; and first reinforcing ribs 24' extending parallel to an imaginary line 41 extending in the radial direction. An imaginary line 41 extends in an equidistant manner between two adjacent first reinforcing ribs 24. The bottom surface 12 of the support layer 4 of fig. 5 is divided into four independent quadrants by the first reinforcing ribs 24. Each quadrant includes an imaginary line 41. The first reinforcing ribs 24' have different extensions depending on the quadrant in which they are located. In particular, the first reinforcing ribs 24' of a quadrant extend parallel to the imaginary line 41 of that quadrant.
The rib structure of fig. 1 and 5 further comprises a second reinforcing rib 26 extending in a circumferential direction around the centre 34 of the support layer 4. In this embodiment, the second reinforcing ribs 26 have a circular extension that extends perpendicular to an imaginary radial line 41 at the respective intersection of the first reinforcing ribs 24. The second reinforcing ribs 26 do not extend exactly perpendicular to the other first reinforcing ribs 24' at the intersection points. Since the first reinforcing ribs 24 'do not extend exactly radially, the second reinforcing ribs 26 do not extend exactly perpendicularly to the first reinforcing ribs 24' at their intersection points. The closer the first reinforcing rib 24' of a quadrant is to the imaginary radial line 41 of that quadrant, the closer the angle between the first reinforcing rib 24 and the second reinforcing rib 26 is to 90 °. Thus, the term "substantially perpendicular" includes angles of substantially 50 ° to 130 °, preferably between 70 ° and 110 °.
The first reinforcing ribs 24 extending in the radial direction may extend along the entire distance between the center 34 of the support layer 4 and the outer edge 40 of the support layer 4. Alternatively, the reinforcing ribs 24, 26, 28 comprise first reinforcing ribs 24 extending in a radial direction from the center 34 of the support layer 4 or extending parallel to the radial direction along at least a portion of the distance between the center 34 of the support layer 4 and the outer edge 40 of the support layer 4. Thus, the first reinforcing ribs 24 may start at a distance from the center 34 of the support layer 4 and/or end at a distance from the outer edge 40 of the support layer 4.
Preferably, the first reinforcing ribs 24 are equally spaced relative to each other in the circumferential direction (see fig. 1, 3, 5 (with respect to the first ribs 24, but not the other first ribs 24') and 6). This provides a uniform distribution of the reinforcing ribs 24 on the bottom surface 12 of the support layer 4 and provides a certain amount of stiffness and bending stiffness of the support layer 4 and the underlay sheet 2, respectively, with a uniform distribution at discrete angles of rotation about the centre 34 of the support layer 4.
Preferably, the second reinforcing ribs 26 extend coaxially around the center 34 of the support layer 4. This provides an even and uniform distribution of the weight of the underlay sheet 2 with respect to the central axis 22 of the support layer 4, thereby minimizing vibrations during rotation of the underlay sheet 2 about its axis of rotation 22 through the centre 34 of the support layer 4. Adjacent second reinforcing ribs 26 are spaced apart from each other in the radial direction, preferably by equal distances. Of course, it is also possible to design the reinforcing rib structure so that adjacent second circumferential reinforcing ribs 26 towards the centre 34 of the support layer 4 have a greater distance than adjacent second circumferential reinforcing ribs 26 towards the outer edge 40 of the support layer 4, and vice versa.
Furthermore, the reinforcing ribs 24, 26, 28 may comprise a third reinforcing rib 28, which is realized as: circular, semicircular or elliptical ribs located at least some of the intersections between the first radially extending reinforcing ribs 24 (see fig. 3 and 6) or the first reinforcing ribs 24' (see fig. 5) extending parallel to the radial direction 41 and the second circumferentially extending reinforcing ribs 26, wherein these intersections form the center of the third reinforcing ribs 28. The third reinforcing ribs 28 add additional stiffness and bending stiffness to the support layer 5 and the backing plate 2, respectively.
In the embodiment of fig. 3, the third reinforcing ribs 28 have a mostly circular shape. A circular third rib 28 is located at each intersection between the first radial rib 24 and the second circumferential rib 26. Of course, towards the centre 34 of the supporting layer 4 and towards the outer edge 40 of the supporting layer 4, the third reinforcing ribs 28 may have a semi-circular or semi-elliptical form (see fig. 3). The centre of the semi-elliptical outer third rib 28 is constituted by the intersection between the first radial rib 24 and the outer edge 40 of the support layer 4. In the embodiment of fig. 5, the third reinforcing ribs 28 all have a circular shape. The circular third ribs 28 are located only: at some intersections between the first radial ribs 24 and other first ribs 24 'extending parallel to the radial imaginary line 41, and at some intersections between other first ribs 24' extending parallel to the radial imaginary line 41 and the second circumferential ribs 26. In the embodiment of fig. 6, third reinforcing ribs 28 have an elliptical shape. The elliptical third ribs 28 are located only at some of the intersections between the first radial ribs 24 and the second substantially circumferential ribs 26. The third reinforcing ribs 28 may also have the form of any polygon, in particular a polygon having more than three sides and corners. For example, third reinforcing ribs 28 may have a diamond-shaped form having four sides and four corners.
The reinforcing rib structure may be designed such that: adjacent third reinforcing ribs 28 contact a common point or region forming the outer wall of the third reinforcing rib 28. Preferably, the third reinforcing ribs 28 of adjacent intersections are spaced apart from one another.
The reinforcing rib structure may be designed such that: at least some of the third reinforcing ribs 28 have different forms and/or diameters (see fig. 3). For example, the third reinforcing ribs 28 toward the center 34 of the support layer 4 may be smaller than the third reinforcing ribs located toward the outer edge 40 of the support layer 4. Preferably, the third reinforcing ribs 28 have the same form and/or the same diameter over the entire bottom surface 12 of the support layer 4 (see fig. 5).
The underlay sheet 2 can have any given form, in particular rectangular or triangular, in top view. These shim plates 2 will not rotate about the centre axis of rotation 22 but only perform a pure orbital machining movement. To do so, they would be attached to a rail polishing or sanding power tool. Preferably, the shim plate 2 has a circular shape in top view. Such a pad 2 may perform a purely orbital, random orbital or rotary orbital (gear driven) machining movement depending on the type of polishing or sanding power tool to which it is attached.
The manufacture of the underlay sheet 2 can be performed in the following way: first, the connecting member 6 for connecting the setting plate 2 to the drive shaft 18 or eccentric member of the polishing or sanding power tool may be inserted into the bottom of the injection mold. The heated material of the support layer 4 is then injected into an injection mould, surrounding at least a portion of the connection element 6. The bottom surface 12 of the support layer 4 faces upwards in the injection mould. For example, reinforcing ribs 24, 26, 28 are created by closing an injection mold with a cap having channels embedded therein corresponding to reinforcing ribs 24, 26, 28. The cover is pressed against the material of the support layer 4, from which material enters the channels, so that the reinforcing ribs 24, 26, 28 are formed. The heated material of the damping layer 10 is then injected into an injection mould on top of the bottom surface 12 of the support layer 4. If a cover is used to create the reinforcing ribs 24, 26, 28, the material of the damping layer 10 must be removed before it is inserted into the injection mold. Due to the fluid or viscous condition of the heated material of damping layer 10, it enters and completely fills the grooves 30 between reinforcing ribs 24, 26, 28. Finally, the adhesive layer 14 is positioned on the bottom surface 16 of the damping layer 10. The material of the underlay sheet 2 may be cured under heat and/or pressure. After the material cures, the damping layer 10 is fixedly attached to the bottom surface 12 of the support layer 4, and the adhesive layer 14 is fixedly attached to the bottom surface 16 of the damping layer 10.
Fig. 9 shows a different embodiment of a shim plate 2 according to the invention. In order to avoid warping of the underlay sheet 2 during its intended use and to increase the stiffness and bending rigidity of the underlay sheet 2, it is suggested that the bottom surface 12 of the support layer 4 is provided with reinforcing elements in the form of reinforcing ribs 24, 26. The bottom surface 12 of the support layer 4 is further provided with a groove 30 formed between the reinforcing ribs 24, 26 and at least partially bounded by the reinforcing ribs 24, 26, wherein during manufacture of the underlay sheet 2 the elastic material of the damping layer 10 enters the groove 30 and completely fills the groove 30 after the elastic material has cured. In contrast to the previously described embodiments, the surfaces of the reinforcing ribs 24, 26 facing away from the bottom surface 12 of the support layer 4 towards the damping layer 10 do not have a flat extension, but rather have a corrugated extension. In particular, reinforcing ribs 24, 26 have a maximum thickness at their respective intersection points.
According to the embodiment of fig. 9, the reinforcing element comprises a plurality of first reinforcing ribs 24 extending in a radial direction from the centre 34 of the support layer 4. In this embodiment, a total of 18 first reinforcing ribs 24 are provided, each spaced 20 ° from the other. The reinforcing element further comprises a second reinforcing rib 26 having a circular extension extending equidistant from the centre 34 and perpendicular to the first reinforcing rib 24. In this embodiment, a total of three second reinforcing ribs are provided. Grooves 30 are formed between adjacent first stiffening ribs 24 and adjacent second stiffening ribs 26. Some of grooves 30a are not limited to reinforcing ribs 24, 26 on all sides, but are open to the outside/environment. Only the outer second reinforcing ribs 26 have one surface with a flat extension facing away from the bottom surface 12 of the support layer 4 towards the damping layer 10.
Fig. 11 shows a part of another embodiment of a underlay sheet 2 according to the invention, in which the reinforcement elements comprise: a plurality of discrete pyramidal elements 46 having a base surface in the form of a rectangle, in particular a square. Alternatively, the base surface may also have a circular, triangular or any other polygonal form, in particular an equilateral polygonal form. The side surfaces of the discrete elements 46 converge towards a tip 48 which faces away from the bottom surface 12 of the support layer 4 towards the damping layer 10. The grooves 30 are formed between adjacent discrete elements 46.
Fig. 10 shows a part of a further embodiment of a shim plate 2 according to the invention, wherein the reinforcing elements comprise a plurality of discrete elements 50, 52 forming undulating surface extensions. The discrete elements 50, 52 include hills 50 protruding from the bottom surface 12 and valleys 52 in the form of depressions in the bottom surface 12. The discrete elements 50, 52 are similar to the discrete elements 46 of fig. 11, with all edges being rounded so as to form a wave-like structure on the bottom surface 12 of the support layer 4 of the pallet 2.
Claims (17)
1. A pad (2) for manually polishing or sanding a power tool, comprising:
a support layer (4) made of a rigid material, said support layer (4) comprising, on a top surface (8) thereof, connection elements (6) for connecting the pad (2) to a drive shaft (18) or eccentric element of the polishing or sanding power tool,
a damping layer (10) made of an elastic material, the damping layer (10) being fixedly attached to a bottom surface (12) of the support layer (4), and
an adhesive layer (14) for removably attaching a polishing or sanding member to the backing plate (2), the adhesive layer (14) being fixedly attached to the bottom surface (16) of the damping layer (10),
it is characterized in that the preparation method is characterized in that,
the bottom surface (12) of the support layer (4) is provided with reinforcing elements (24, 26, 28; 46; 50, 52) for reinforcing the bending stiffness of the support layer (4), and the bottom surface (12) of the support layer (4) is further provided with grooves (30) formed between the reinforcing elements (24, 26, 28; 46; 50, 52) and at least partially bounded by the reinforcing elements, wherein during the manufacture of the underlay sheet (2) the resilient material of the damping layer (10) enters the grooves (30) and completely fills the grooves (30) after the resilient material has cured.
2. The underlay sheet (2) according to claim 1, wherein
The reinforcing element comprises: a plurality of discrete pyramidal 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 in the form of an equilateral polygon.
3. The underlay sheet (2) according to claim 1, wherein
The reinforcing elements comprise reinforcing ribs (24, 26, 28).
4. The underlay sheet (2) according to claim 3, wherein
The reinforcing ribs (24, 26, 28) have an at least discrete rotationally symmetrical design with respect to the center (34) of the support layer (4) at least some angles of rotation about the center (34) of the support layer (4).
5. The underlay sheet (2) according to claim 3 or 4, wherein
The reinforcing ribs (24, 26, 28) comprise a plurality of polygonal geometric elements (36), each element (36) having a substantially polygonal rib design, and adjacent elements (36) are positioned adjacent to each other and/or offset with respect to each other.
6. Mat plate (2) according to one of the claims 3 to 5, wherein
The reinforcing ribs (24, 26, 28) comprising: a honeycomb structure having a plurality of honeycombs (36) positioned adjacent one another, each honeycomb (36) having a substantially equilateral hexagonal rib design, and adjacent honeycombs (36) sharing a common rib (24, 26, 28).
7. Shim plate (2) according to one of claims 3 to 6, wherein
The reinforcing ribs (24, 26, 28) comprise a circular spider-web structure extending around a centre (34) of the support layer (4), the spider-web structure having: -first reinforcing ribs (24) extending in a radial direction or parallel to the radial direction from a center (34) of the support layer (4); and second reinforcing ribs (26) extending in a circumferential direction around the centre (34) of the support layer (4), substantially perpendicular to the respective first reinforcing ribs (24) at which they intersect.
8. Shim plate (2) according to one of claims 3 to 7, wherein
The reinforcing ribs (24, 26, 28) comprise first reinforcing ribs (24) extending in a radial direction from a center (34) of the support layer (4) or extending parallel to the radial direction along at least a part of a distance between the center (34) of the support layer (4) and an outer edge (40) of the support layer (4).
9. Shim plate (2) according to claim 7 or 8, wherein
The first reinforcing ribs (24) are equally spaced relative to each other in the circumferential direction.
10. Shim plate (2) according to one of claims 3 to 9, wherein
The reinforcing ribs (24, 26, 28) comprise second reinforcing ribs (26) extending in a circumferential direction around a center (34) of the support layer (4).
11. The underlay sheet (2) according to claim 7 or 10, wherein
The second reinforcing rib (26) extends coaxially around the centre (34) of the support layer (4).
12. Shim plate (2) according to claim 7, 10 or 11, wherein
Adjacent second reinforcing ribs (26) are spaced apart from each other in the radial direction, preferably at equal distances from each other.
13. Shim plate (2) according to one of claims 3 to 12, wherein
The reinforcing ribs (24, 26, 28) comprise third reinforcing ribs (28) realized as: circular, semi-circular or elliptical ribs located at least some of the intersections between radially extending first reinforcing ribs (24) or first reinforcing ribs (24') extending parallel to the radial direction and circumferentially extending second reinforcing ribs (26), wherein the intersections form the center of the third reinforcing rib (28).
14. The underlay sheet (2) according to claim 13, wherein
The third reinforcing ribs (28) of adjacent intersections are spaced apart from one another.
15. The underlay sheet (2) according to claim 13 or 14, wherein
The third reinforcing ribs (28) have the same form and/or the same diameter.
16. The underlay sheet (2) according to one of the preceding claims, wherein
The shim plate (2) has a circular shape in plan view.
17. The underlay sheet (2) according to one of the preceding claims, wherein
The support layer (4) is made of a plastic material, in particular a thermoplastic material, with or without reinforcing fibres.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP21161306.2 | 2021-03-08 | ||
| EP21161306.2A EP4056316A1 (en) | 2021-03-08 | 2021-03-08 | Backing pad for a hand-guided polishing or sanding power tool |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115106934A true CN115106934A (en) | 2022-09-27 |
Family
ID=74859816
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210207973.7A Pending CN115106934A (en) | 2021-03-08 | 2022-03-04 | Backing plate for hand polishing or sanding electric tool |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US20220388122A1 (en) |
| EP (3) | EP4056316A1 (en) |
| JP (1) | JP2022136999A (en) |
| KR (1) | KR20220126252A (en) |
| CN (1) | CN115106934A (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4382252A1 (en) | 2022-12-06 | 2024-06-12 | Lupi, Lucio | Flexible pad for sanding bodywork |
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Also Published As
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|---|---|
| KR20220126252A (en) | 2022-09-15 |
| EP4056318A2 (en) | 2022-09-14 |
| US20220388122A1 (en) | 2022-12-08 |
| EP4056317A3 (en) | 2022-11-23 |
| EP4056317A2 (en) | 2022-09-14 |
| JP2022136999A (en) | 2022-09-21 |
| EP4056318A3 (en) | 2022-12-14 |
| EP4056316A1 (en) | 2022-09-14 |
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