FI20175800A1 - A backing pad arrangement for an abrading system, and the abrading system - Google Patents

A backing pad arrangement for an abrading system, and the abrading system Download PDF

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Publication number
FI20175800A1
FI20175800A1 FI20175800A FI20175800A FI20175800A1 FI 20175800 A1 FI20175800 A1 FI 20175800A1 FI 20175800 A FI20175800 A FI 20175800A FI 20175800 A FI20175800 A FI 20175800A FI 20175800 A1 FI20175800 A1 FI 20175800A1
Authority
FI
Finland
Prior art keywords
backing pad
abrading
additional layer
backing
opening
Prior art date
Application number
FI20175800A
Other languages
Finnish (fi)
Swedish (sv)
Inventor
Stig Finnäs
Simon Bäck
Original Assignee
Mirka Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mirka Ltd filed Critical Mirka Ltd
Priority to FI20175800A priority Critical patent/FI20175800A1/en
Priority to TW107130152A priority patent/TWI810203B/en
Priority to US16/642,142 priority patent/US20200353593A1/en
Priority to EP18852917.6A priority patent/EP3678819A4/en
Priority to PCT/FI2018/050614 priority patent/WO2019048732A1/en
Publication of FI20175800A1 publication Critical patent/FI20175800A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B55/00—Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
    • B24B55/06—Dust extraction equipment on grinding or polishing machines
    • B24B55/10—Dust extraction equipment on grinding or polishing machines specially designed for portable grinding machines, e.g. hand-guided
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B55/00—Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
    • B24B55/06—Dust extraction equipment on grinding or polishing machines
    • B24B55/10—Dust extraction equipment on grinding or polishing machines specially designed for portable grinding machines, e.g. hand-guided
    • B24B55/102—Dust extraction equipment on grinding or polishing machines specially designed for portable grinding machines, e.g. hand-guided with rotating tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B23/00—Portable grinding machines, e.g. hand-guided; Accessories therefor
    • B24B23/02—Portable grinding machines, e.g. hand-guided; Accessories therefor with rotating grinding tools; Accessories therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B23/00—Portable grinding machines, e.g. hand-guided; Accessories therefor
    • B24B23/04—Portable grinding machines, e.g. hand-guided; Accessories therefor with oscillating grinding tools; Accessories therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B41/00—Component parts such as frames, beds, carriages, headstocks
    • B24B41/04—Headstocks; Working-spindles; Features relating thereto
    • B24B41/047—Grinding heads for working on plane surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B55/00—Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
    • B24B55/06—Dust extraction equipment on grinding or polishing machines
    • B24B55/10—Dust extraction equipment on grinding or polishing machines specially designed for portable grinding machines, e.g. hand-guided
    • B24B55/105—Dust extraction equipment on grinding or polishing machines specially designed for portable grinding machines, e.g. hand-guided with oscillating tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D3/00—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents
    • B24D3/001—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as supporting member
    • B24D3/002—Flexible supporting members, e.g. paper, woven, plastic materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D3/00—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents
    • B24D3/02—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent
    • B24D3/20—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent and being essentially organic
    • B24D3/22—Rubbers synthetic or natural
    • B24D3/26—Rubbers synthetic or natural for porous or cellular structure
    • 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
    • B24D9/085—Devices for mounting sheets on a backing plate

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Cleaning In General (AREA)
  • Electric Connection Of Electric Components To Printed Circuits (AREA)
  • Polishing Bodies And Polishing Tools (AREA)

Abstract

The application relates to a backing pad arrangement suitable for an abrading system. The backing pad arrangement comprises a backing pad (413, 513, 523), and an additional layer (418, 518, 528) or an abrading article (417, 527) adapted to be attached to the backing pad (413, 513, 523) with at least one fixing member (319, 419, 519, 529), which at least one fixing member (319, 419, 519, 529) may be hollow in its longitudinal direction. The application further relates to the abrading system comprising the backing pad arrangement according to the application.

Description

A BACKING PAD ARRANGEMENT FOR AN ABRADING SYSTEM, AND THE ABRADING SYSTEM
Technical field
The application relates to a backing pad arrangement suitable for an abrading system. The application further relates to the abrading system.
Background
Abrading is performed in a multitude of contexts such as automobile repair and paint work, building construction and repair, and manufacturing and repairing furniture and the like. Commonly, an abrading article is attached to 15 a backing pad of an abrading system via attachment elements. Abrading in all contexts creates debris, which causes wearing of the attachment elements. The backing pad thus loses its property to keep the abrading article in place, and the backing pad must then be replaced.
Summary
It is an object of the application to provide a longer lifetime of a backing pad, thus saving costs and environment.
According to an aspect of the application, a backing pad arrangement for an abrading system, the backing pad arrangement comprising a backing pad, wherein the lower surface of the backing pad comprises at least one opening, which at least one opening is adapted to receive a fixing member, is provided. The backing pad arrangement further comprises an additional layer 30 adapted to be attached to the backing pad. The additional layer comprises an upper surface, a lower surface and at least one opening which extends through the additional layer. The additional layer is attached to the backing pad with at least one fixing member. Alternatively, the backing pad arrangement further comprises an abrading article adapted to be attached to 35 the backing pad. The abrading article comprises at least one opening, which extends through the abrading article. The abrading article is attached to the
20175800 prh 08 -09- 2017 backing pad with at least one fixing member. The at least one fixing member is hollow in its longitudinal direction.
According to another aspect of the application, a backing pad arrangement for an abrading system, the backing pad arrangement comprising a backing pad, wherein the lower surface of the backing pad comprises two or more openings, said openings being adapted to receive fixing members, is provided. The backing pad arrangement further comprises an additional layer adapted to be attached to the backing pad, which additional layer comprises 10 an upper surface, a lower surface and two or more openings which extend through the additional layer. The additional layer is attached to the backing pad with two or more fixing members. Alternatively, the backing pad arrangement further comprises an abrading article adapted to be attached to the backing pad, which abrading article comprises two or more openings, 15 which extend through the abrading article. The abrading article is attached to the backing pad with two or more fixing members.
According to yet another aspect of the application, an abrading system comprising an abrading apparatus, wherein the abrading system further 20 comprises a backing pad arrangement according to the application, is provided.
Brief description of the drawings
The figures are presented to illustrate the disclosed embodiments, and are not to be taken to be limiting the scope of their use. The figures are not in any particular scale.
Figure 1 illustrates a cross-sectional view of a backing pad attached to an abrading apparatus.
Figure 2a illustrates a cross-sectional partial view of a backing pad with an abrading paper.
Figure 2b illustrates a cross-sectional partial view of a backing pad with an abrading net.
Figure 2c illustrates a cross-sectional partial view of a backing pad with a pad saver in between the backing pad and an abrading net.
Figure 2d illustrates a cross-sectional partial view of a backing pad with an interface in between the backing pad and an abrading net.
Figure 3 illustrates a cross-sectional view and a perspective view of a hollow fixing member for use in a backing pad arrangement.
Figure 4 illustrates a cross-sectional partial view of a backing pad.
Figure 5a illustrates a backing pad seen from the underside.
Figure 5b illustrates a cross-sectional view of a backing pad.
Detailed description
The solution is described in the following in more detail with reference to 20 some embodiments, which shall not be regarded as limiting.
In the following description, reference is made to the figures with the following numerals and denotations:
Sx and Sy denote orthogonal directions
20175800 prh 08 -09- 2017
Motor
Motor shaft
Bearing
14 Spindle
Pad screw
Suction opening
Abrading article
Backing pad
211 Coverplate
212 Upper opening
20175800 prh 08 -09- 2017
213 Glass fiber plate
214 Hard foam
215 Backing pad hooks
216 Suction opening
217 Abrading paper with loops
221 Cover plate
222 Upper opening
223 Glass fiber plate
224 Hard foam
225 Backing pad hooks
226 Suction opening
227 Abrading net with loops
231 Cover plate
232 Upper opening
233 Glass fiber plate
234 Hard foam
235 Backing pad hooks
236 Suction opening
237 Abrading net with loops
238 Pad saver with loops and hooks
241 Cover plate
242 Upper opening
243 Glass fiber plate
244 Hard foam
245 Backing pad hooks
246 Suction opening
247 Abrading net with loops
248 Interface with loops, soft foam and hooks
319 Fixing member
411 Cover plate
412 Upper opening
413 Backing pad
416 Suction opening
417 Abrading net
418 Additional layer
419 Fixing member
422 Additional opening
513 Backing pad
516 Suction opening
518 Additional layer
519 Fixing member
521 Cover plate
522 Upper opening
523 Backing pad
526 Suction opening
527 Abrading net
528 Additional layer
529 Fixing member
532 Additional opening
534 Air inlet conduit
535 Air inlet opening
20175800 prh 08 -09- 2017
An abrading apparatus to which a backing pad is attached is illustrated in Figure 1. The abrading apparatus comprises a pneumatic or electrical driven motor 11 for rotating a motor shaft 12. The abrading apparatus comprises a 20 bearing 13 mounted eccentrically with respect to the motor shaft 12 at a lower end of the motor shaft 12. To the bearing 13 a spindle 14 is mounted. Alternatively, the bearing may be mounted in an additional shaft balancer and the motor 11 is arranged to rotate the shaft balancer by means of connection members or gears.
The backing pad 18 is attached to the spindle 14. The backing pad 18 may be attached to the spindle 14 with a pad screw 15. By this arrangement the backing pad 18 may move in random circles. This refers to oscillating movement. An upper surface of the backing pad 18 refers to a surface that is 30 arranged to be attached to the abrading apparatus. A lower surface of the backing pad 18 refers to the opposite surface on the Sx,Sy plane.
As illustrated in Figures 2a-d, the upper surface of the backing pad 18 comprises a cover plate 211, 221, 231, 241. The cover plate 211, 221, 231, 35 241 may comprise upper openings 212, 222, 232, 242. The backing pad 18 may comprise a glass fiber plate 213, 223, 233, 243 arranged below the
20175800 prh 08 -09- 2017 cover plate 211, 221, 231, 241. The backing pad may further comprise a layer comprising hard foam 214, 221, 234, 244 below the glass fiber plate.
The lower surface of the backing pad 18 may comprise suction openings
216, 226, 236, 246. The suctions openings 216, 226, 236, 246 may be in 5 connection with the upper openings 212, 222, 232, 242. As illustrated in
Figures 2a-d, upper opening 212, 222, 232, 242 may be connected to more than one suction openings 216, 226, 236, 246. Thus, one upper opening 212, 222, 232, 242 may serve as an outlet for debris and/or airflow from more than one suction openings 216, 226, 236, 246.
During abrading a work piece with the abrading system, an abrading article
217, 227, 237, 247 may be attached to the lower surface of the backing pad 18. The abrading article 217, 227, 237, 247 may be attached to the lower surface of the backing pad 18 via attachment elements 215, 225, 235, 245 at the lower surface of the backing pad 18 and at the upper surface of the abrading article 217, 227, 237, 247. The upper surface of the abrading article 217, 227, 237, 247 is detachably attachable to the lower surface of the backing pad 18. The abrading article 217, 227, 237, 247 may comprise abrasive particles. The abrading article 217, 227, 237, 247 may comprise 20 abrasive material, like a sandpaper or a sanding net. An abrading surface refers to the surface that is adapted to be in contact with the surface to be abraded during abrading.
In all abrading, whether abrading a discrete work piece or larger surface such 25 as a wall or a ceiling, abrading debris is created. This debris may comprise abraded material from the abraded surface as well as abrasive particles detached from the abrading article. Debris may be fine-grained. Debris remaining in the abrading process may adversely affect abrasion efficiency and resulting surface quality, and may clog the abrading article. Accumulated 30 debris on the abrading article and/or the backing pad adds to the weight of the system component on which debris accumulates, resulting in an imbalanced abrading system which may compromise user control, abrading efficiency and surface quality.
The abrading article 217, 227, 237, 247 may comprise openings corresponding to the suction openings 216, 226, 236, 246 of the backing pad
20175800 prh 08 -09- 2017 or the abrading article 217, 227, 237, 247 may comprise an abrading net which comprises an open mesh. During abrading the open mesh allows debris and air to flow through the net. When attached to the backing pad 18 the openings of the abrading article 217, 227, 237, 247 are aligned with the suction openings 216, 226, 236, 246 of the backing pad 18.
The abrading article 217, 227, 237, 247 and the backing pad 18 may be of any shape on the Sx,Sy plane, such as rectangular, triangular, or preferably round. Preferably, the backing pad 18 and the abrading article 217, 227, 237, 247 are substantially of the same shape and size. The backing pad 18 and the abrading article 217, 227, 237, 247 are attachable such that edge portions of the facing surfaces of backing pad 18 and abrading article 217, 227, 237, 247, when attached next to each other, are compatible forming uniform external edge portion. The backing pad 18 and the abrading article 217, 227, 237, 247 have similar external edges in shape, size and form.
The abrading system may comprise a debris extractor for providing a suction pressure and transporting debris formed during abrading work. The abrading system may comprise a housing for guiding the suction pressure from the debris extractor system to the upper side of the backing pad 18. The suction pressure may be guided through the abrading apparatus above the backing pad 18. From outside the backing pad 18 and possibly through inlet conduits 534 and air inlet opening 535 in the backing pad 18 air may be transported by the suction pressure through suction openings in the backing pad 18 to the debris extractor. With this airflow, debris is transported away from underside of the backing pad 18 and the abrading article 217, 227, 237, 247.
Although most of the debris is transported away with the air flow caused by the suction pressure, even a small amount of remaining debris may wear the attachment elements 215, 225, 235, 245 of the lower surface of the backing pad 18 and/or the upper surface layer of the abrading article 217, 227, 237, 247. With worn attachment elements 215, 225, 235, 245 the lower surface of the backing pad 18 and/or the upper surface layer of the abrading article 217, 227, 237, 247 lose its/their property to keep the abrading article 217, 227, 237, 247 attached to the backing pad 18.
20175800 prh 08 -09- 2017
For smaller backing pads 18 an additional layer 238, 248 comprising attachment elements may be used in between the backing pad 18 and the abrading article 217, 227, 237, 247. Use of the additional layer 238, 248 may provide savings in costs and a longer lifetime for the backing pad 18. When 5 the attachment elements of the additional layer 238, 248 are worn out, the additional layer 238, 248 instead of the backing pad 18 is to be replaced.
The additional layer 238, 248 comprises an upper surface, which refers to the surface on the Sx,Sy plane that is arranged to be attached against the 10 backing pad, as well as a lower surface, which refers to the opposite surface of the additional layer 238, 248 on the Sx,Sy plane. The additional layer 238, 248 may be a pad saver or an interface. The pad saver comprises an upper surface and a lower surface. The upper surface and the lower surface of the pad saver may comprise attachment elements. The interface comprises an 15 upper surface, a lower surface and an intermediate layer. The upper surface and the lower surface of the interface may comprise attachment elements.
However, when using larger backing pads, the additional layer 238, 248 as described above may not extend the lifetime of the backing pad. For larger 20 backing pads, the airflow is not sufficient to keep the area clean when using a weak debris extractor. The debris gathers in the attachment elements between the backing pad and the additional layer 238, 248 and may even shorten the lifetime of the attachment elements of the backing pad.
A larger backing pad refers to a backing pad comprising a diameter of more than 150 mm. For a backing pad having a shape on the Sx,Sy plane other than round, such as rectangular, triangular, elliptical or otherwise polygonal, the diameter refers to longest possible distance between the edges of the backing pad.
For larger backing pads, a solution according to an embodiment is provided. According to an embodiment, the backing pad 413, 523 comprises an additional layer 418, 518, 528, which is attached to the backing pad 413, 523 with at least one fixing member 319, 419, 519, 529 as illustrated in Figures 3, 35 4, 5a and 5b.
20175800 prh 08 -09- 2017
The fixing member 319, 419, 519, 529 may be of a type of a screw. The fixing member 319, 419, 519, 529 may comprise screw threads. The fixing member 319, 419, 519, 529 may comprise a stub portion. Alternatively, the fixing member may be e.g. of a snap hook- or expanding type. The fixing 5 member 319, 419, 519, 529 may comprise plastic and/or metal.
Advantageously, the fixing member 319, 419, 519, 529 comprises plastic. The fixing member 319, 419, 519, 529 may be hollow in its longitudinal direction. Longitudinal direction refers to the direction of the fixing member 319, 419, 519, 529 arranged to pass through the backing pad 413, 523 and 10 the additional layer 418, 518, 528, being perpendicular to the surfaces of backing pad 413, 523 and additional layer 418, 518, 528. The fixing member 319, 419, 519, 529 passing through the backing pad 413, 523 and the additional layer 418, 518, 528 is arranged to enable the attachment of the backing pad 413, 523 and the additional layer 418, 518, 528. The hollow 15 fixing member 319, 419, 519, 529 allows the air to flow through.
The additional layer 418, 518, 528 comprises an upper surface, which refers to the surface on the Sx,Sy plane that is arranged to be attached against the backing pad 413, 523, as well as a lower surface, which refers to the 20 opposite surface of the additional layer 418, 518, 528 on the Sx,Sy plane. The additional layer 418, 518, 528 may be a pad saver or an interface. The pad saver comprises an upper surface and a lower surface. The interface comprises an upper surface, a lower surface and an intermediate layer.
The upper surface of the additional layer 418, 518, 528 may comprise fabric, film, plastic sheet and/or attachment elements, such as loops.
The lower surface of the additional layer 418, 518, 528 may comprise attachment elements for attaching the additional layer 418, 518, 528 to an 30 abrading article 417, 527. Such attachment elements may enable mechanical or adhesive attachment. Advantageously, such attachment enables removal and re-attachment. Attachment elements may comprise hook-and-loop type of fastening with the capability for convenient re-attachment. In an embodiment, the lower surface layer of the additional layer 418, 518, 528 35 comprises hooks. In another embodiment, the lower surface layer of the additional layer 418, 518, 528 comprises loops.
20175800 prh 08 -09- 2017
The lower surface of the additional layer 418, 518, 528 may comprise abrasive particles. The abrasive particles may be attached to the lower surface of the additional layer 418, 518, 528 via an adhesive.
The intermediate layer of the additional layer 418, 518, 528 may comprise a cushion. The intermediate layer may comprise soft material, such as foam.
The soft intermediate layer of the additional layer 418, 518, 528 enables the additional layer 418, 518, 528 to adapt to contours of a surface when 10 abrading.
The cover plate 411, 521 of the backing pad 413, 523 comprises openings.
The cover plate 411, 521 of the backing pad 413, 523 may comprise upper openings 412, 522 and additional openings 422, 532. The upper openings 15 412, 522 and additional openings 422, 532 are technically similar. The term upper opening 412, 522 refers to an opening that may be aligned with a suction opening 416, 516, 526 of the additional layer 418, 518, 528 comprising a fixing member 319, 419, 519, 529 fixed to it. The term additional opening 422, 532 refers to an opening that may be aligned with a suction 20 opening 416, 516, 526 of the additional layer 418, 518, 528 that does not comprise a fixing member 319, 419, 519, 529 fixed to it.
The additional layer 418, 518, 528 comprises suction openings 416, 516, 526. The suction openings 416, 516, 526 may extend through the additional 25 layer 418, 518, 528. The suction openings 416, 516, 526 extending through the additional layer 418, 518, 528 may be arranged such that when attached to the backing pad 413, 523, the suction openings 416, 516, 526 are aligned with upper openings 412, 522 and additional openings 422, 532 comprised by the cover plate 411, 521. The suction openings 416, 516, 526 may be 30 connected with the upper openings 412, 522 and/or additional openings 422,
532 of the cover plate 411, 521. Through the extended, continuous suction conduit(s) thus formed, debris forming during abrading work may be transported together with the airflow caused by the suction pressure provided by the debris extractor. Upper opening 412, 522 may be connected to more 35 than one suction openings 416, 516, 526. Thus, one upper opening 412, 522 or one additional opening 422, 532 may serve as an outlet for debris and/or
20175800 prh 08 -09- 2017 airflow from more than one suction openings 416, 516, 526. The debris extractor system is arranged to guide debris away from the additional layer 418, 518, 528 and the abrading surface of the abrading article 417, 527.
According to an embodiment, the additional layer 418, 518, 528 is attached to the backing pad 413, 523 with at least one fixing member 319, 419, 519, 529. The at least one fixing member 319, 419, 519, 529 is hollow in its longitudinal direction. A fixing member 319, 419, 519, 529, which is arranged through openings of a backing pad and an additional layer or an abrading 10 article, may form a border at circumference of the openings. Thus opening may be of smaller area and/or volume due to the fixing member 319, 419, 519, 529, but it still allows air and/or debris to flow through.
According to an embodiment, the additional layer 418, 518, 528 is attached 15 to the backing pad 413, 523 with multiple fixing members 319, 419, 519, 529.
The fixing members 419, 519, 529 may be arranged in a symmetrical or unsymmetrical manner. The fixing members 319, 419, 519, 529 may be fixed to the suction openings 416, 516, 526 of the additional layer 418, 518, 528. The fixing members may be fixed in alignment with the upper openings 412, 20 522 of the cover plate 411, 521. The suction openings 416, 516, 526 of the additional layer 418, 518, 528 are in connection with the upper openings 412, 522 and additional openings 422, 532 of the cover plate 411, 521 of the backing pad 413, 523. The hollow fixing members 319, 419, 519, 529 allow the debris to be transported with air through the fixing members. The debris 25 may also be transported through the suction conduits formed by the suction openings 416, 516, 526 of the additional layer 418, 518, 528 and the additional openings 422, 532 of the cover plate 411, 521 of the backing pad 413, 523.
An air inlet conduit 534 of the backing pad 523 is arranged to lead air via an air inlet opening 535 to the abrading surface of the abrading article 527. This increases the air flow from the abrading surface of the abrading article 527 to the suction openings 526.
According to another embodiment, the additional layer may be attached to the backing pad with one fixing member, which fixing member is arranged in
20175800 prh 08 -09- 2017 the center of the backing pad. The center of the backing pad refers to a center point of the backing pad in the Sx,Sy plane. The fixing member is hollow in its longitudinal direction. The hollow fixing member allows the air to flow through. The hollow fixing member allows the debris to be transported 5 through the fixing member. The debris may also be transported through the suction conduits formed by the suction openings of the additional layer and the additional openings of the cover plate of the backing pad.
According to an aspect of the application, a backing pad arrangement for an 10 abrading system, the backing pad arrangement comprising a backing pad, wherein the lower surface of the backing pad comprises at least one opening, which at least one opening is adapted to receive a fixing member, is provided. The backing pad arrangement further comprises an additional layer adapted to be attached to the backing pad. The additional layer comprises an 15 upper surface, a lower surface and at least one opening which extends through the additional layer. The additional layer is attached to the backing pad with at least one fixing member. Alternatively, the backing pad arrangement further comprises an abrading article adapted to be attached to the backing pad. The abrading article comprises at least one opening, which 20 extends through the abrading article. The abrading article is attached to the backing pad with at least one fixing member. The at least one fixing member is hollow in its longitudinal direction. The additional layer or the abrading article may be attached to the backing pad with two or more fixing members. The additional layer or the abrading article may be attached to the backing 25 pad with one fixing member arranged in the center of the backing pad. The fixing member may be of screw-, snap hook- or expanding type. The backing pad may comprise at least one air inlet conduit for conducting air to an abrading surface. The additional layer may comprise a soft intermediate layer between the upper surface and the lower surface of the additional layer. The 30 lower surface of the additional layer may comprise abrasive particles. The backing pad may comprise at least one additional opening not adapted to receive a fixing member.
According to another aspect of the application, a backing pad arrangement 35 for an abrading system, the backing pad arrangement comprising a backing pad, wherein the lower surface of the backing pad comprises two or more
20175800 prh 08 -09- 2017 openings, said openings being adapted to receive fixing members, is provided. The backing pad arrangement further comprises an additional layer adapted to be attached to the backing pad, which additional layer comprises an upper surface, a lower surface and two or more openings which extend 5 through the additional layer. The additional layer is attached to the backing pad with two or more fixing members. Alternatively, the backing pad arrangement further comprises an abrading article adapted to be attached to the backing pad, which abrading article comprises two or more openings, which extend through the abrading article. The abrading article is attached to 10 the backing pad with two or more fixing members. The fixing members may be of screw-, snap hook- or expanding type. The fixing members may be non-hollow. The backing pad may comprise at least one air inlet conduit for conducting air to an abrading surface. The additional layer may comprise a soft intermediate layer between the upper surface and the lower surface of 15 the additional layer. The lower surface of the additional layer may comprise abrasive particles. The backing pad may comprise at least one additional opening not adapted to receive a fixing member.
According to yet another aspect of the application, an abrading system 20 comprising an abrading apparatus, wherein the abrading system further comprises a backing pad arrangement according to the application, is provided. The abrading system may comprise a debris extractor system adapted to provide suction pressure and to remove debris formed during abrading work. The debris extractor system may be arranged to guide debris 25 away from the additional layer and the abrading surface. The debris extractor system may be adapted to guide debris via at least one of the following: the additional layer, the abrading article, the backing pad, the fixing member(s), opening(s) of the additional layer, opening(s) of the abrading article, opening(s) of a cover plate of the backing pad. Opening(s) of the additional 30 layer or opening(s) of the abrading article, and opening(s) of the cover plate of the backing pad may be connected in order to form conduit(s) for removing debris.
The lifetime of a backing pad arrangement according to an embodiment was 35 tested and compared with a backing pad arrangement having the additional layer attached to it via hook-and-loop type attachment elements. Depending on the material of the attachment elements, the average lifetime of the latter backing pad arrangement was shown to be between 12 and 17 hours. For the backing pad arrangement according to the embodiment, the lifetime of the additional layer was shown to be between 35 and 42 hours. Moreover, 5 after that the backing pad was not shown to be worn out and could be used again by replacing the additional layer with a new one.
The above presented provides a cost efficient and ecological backing pad for an abrading system. It is far more cost efficient to replace the additional layer 10 instead of the whole backing pad. The extended lifetime of backing pads decreases wasted backing pads and thus saves environment.
Many variations of the present application will suggest themselves to those skilled in the art in light of the description in previous. Such obvious variations 15 are within the full intended scope of the appended claims.

Claims (19)

  1. Claims:
    1. A backing pad arrangement for an abrading system, the backing pad arrangement comprising a backing pad (413, 513, 523), wherein the lower
    5 surface of the backing pad (413, 513, 523) comprises at least one opening, which at least one opening is adapted to receive a fixing member (319, 419, 519, 529), and the backing pad arrangement further comprises:
    - an additional layer (418, 518, 528) adapted to be attached to the backing pad (413, 513, 523), which additional layer (418, 518, 528)
    10 comprises an upper surface, a lower surface and at least one opening (416, 516, 526) which extends through the additional layer (418, 518, 528), and the additional layer is attached to the backing pad (413, 513, 523) with at least one fixing member (319, 419, 519, 529), or
    - an abrading article (417, 527) adapted to be attached to the backing 15 pad (413, 513, 523), which abrading article comprises at least one opening, which extends through the abrading article (417, 527), and the abrading article (417, 527) is attached to the backing pad (413, 513, 523) with at least one fixing member (319, 419, 519, 529), wherein the at least one fixing member (319, 419, 519, 529) is hollow in its 20 longitudinal direction.
  2. 2. The backing pad arrangement according to claim 1, wherein the additional layer (418, 518, 528) or the abrading article (417, 527) is attached to the backing pad (413, 513, 523) with two or more fixing members (319, 419, 519,
    25 529).
  3. 3. The backing pad arrangement according to claim 1, wherein the additional layer (418, 518, 528) or the abrading article (417, 527) is attached to the backing pad (413, 513, 523) with one fixing member (319, 419, 519, 529)
    30 arranged in the center of the backing pad (413, 513, 523).
  4. 4. The backing pad arrangement according to any of claims 1-3, wherein the fixing member (319, 419, 519, 529) is of screw-, snap hook- or expanding type-
    20175800 prh 08 -09- 2017
  5. 5. The backing pad arrangement according to any of claims 1-4, wherein the backing pad (413, 513, 523) comprises at least one air inlet conduit (534) for conducting air to an abrading surface.
    5
  6. 6. The backing pad arrangement according to any of claims 1-5, wherein the additional layer (418, 518, 528) comprises a soft intermediate layer between the upper surface and the lower surface of the additional layer (418, 518, 528).
    10
  7. 7. The backing pad arrangement according to any of claims 1-6, wherein the lower surface of the additional layer (418, 518, 528) comprises abrasive particles.
  8. 8. The backing pad arrangement according to any of claims 1-7, wherein the 15 backing pad (413, 513, 523) comprises at least one additional opening (532) not adapted to receive a fixing member (319, 419, 519, 529).
  9. 9. A backing pad arrangement for an abrading system, the backing pad arrangement comprising a backing pad (413, 513, 523), wherein the lower
    20 surface of the backing pad (413, 513, 523) comprises two or more openings, said openings being adapted to receive fixing members (319, 419, 519, 529), and the backing pad arrangement further comprises:
    - an additional layer (418, 518, 528) adapted to be attached to the backing pad (413, 513, 523), which additional layer (418, 518, 528)
    25 comprises an upper surface, a lower surface and two or more openings (416, 516, 526) which extend through the additional layer (418, 518, 528), and the additional layer is attached to the backing pad (413, 513, 523) with two or more fixing members (319, 419, 519, 529), or
    - an abrading article (417, 527) adapted to be attached to the backing 30 pad (413, 513, 523), which abrading article comprises two or more openings, which extend through the abrading article (417, 527), and the abrading article (417, 527) is attached to the backing pad (413, 513, 523) with two or more fixing members (319, 419, 519, 529).
    20175800 prh 08 -09- 2017
  10. 10. The backing pad arrangement according to claim 9, wherein the fixing members (319, 419, 519, 529) are of screw-, snap hook- or expanding type and/or the fixing members (319, 419, 519, 529) are non-hollow.
    5
  11. 11. The backing pad arrangement according to claim 9-10, wherein the backing pad (413, 513, 523) comprises at least one air inlet conduit (534) for conducting air to an abrading surface.
  12. 12. The backing pad arrangement according to any of claims 9-11, wherein 10 the additional layer (418, 518, 528) comprises a soft intermediate layer between the upper surface and the lower surface of the additional layer (418, 518, 528).
  13. 13. The backing pad arrangement according to any of claims 9-12, wherein 15 the lower surface of the additional layer (418, 518, 528) comprises abrasive particles.
  14. 14. The backing pad arrangement according to any of claims 9-13, wherein the backing pad (413, 513, 523) comprises at least one additional opening
    20 (532) not adapted to receive a fixing member (319, 419, 519, 529).
  15. 15. An abrading system comprising an abrading apparatus, wherein the abrading system further comprises a backing pad arrangement according to any of claims 1-14.
  16. 16. The abrading system according to claim 15, wherein the abrading system comprises a debris extractor system adapted to provide suction pressure and to remove debris formed during abrading work.
    30
  17. 17. The abrading system according to claim 16, wherein the debris extractor system is arranged to guide debris away from the additional layer (418, 518, 528) and the abrading surface.
  18. 18. The abrading system according to claim 16 or 17, wherein the debris 35 extractor system is adapted to guide debris via at least one of the following:
    - the additional layer (418, 518, 528),
    - the abrading article (417, 527),
    - the backing pad (413, 513, 523),
    - the fixing member(s) (319, 419, 519, 529),
    - opening(s) of the additional layer (418, 518, 528),
    5 - opening(s) of the abrading article (417, 527),
    - opening(s) (412, 522, 422, 532) of a cover plate (411, 521) of the backing pad (413, 513, 523).
  19. 19. The abrading system according to any of claims 15-18, wherein
    10 - opening(s) (416, 516, 526) of the additional layer (418, 518, 528) or opening(s) of the abrading article (417, 527), and
    - opening(s) (412, 522, 422, 532) of the cover plate (411, 521) of the backing pad (413, 513, 523) are connected in order to form conduit(s) for removing debris.
FI20175800A 2017-09-08 2017-09-08 A backing pad arrangement for an abrading system, and the abrading system FI20175800A1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
FI20175800A FI20175800A1 (en) 2017-09-08 2017-09-08 A backing pad arrangement for an abrading system, and the abrading system
TW107130152A TWI810203B (en) 2017-09-08 2018-08-29 A backing pad arrangement for an abrading system, and the abrading system
US16/642,142 US20200353593A1 (en) 2017-09-08 2018-08-30 A backing pad arrangement for an abrading system, and the abrading system
EP18852917.6A EP3678819A4 (en) 2017-09-08 2018-08-30 A backing pad arrangement for an abrading system, and the abrading system
PCT/FI2018/050614 WO2019048732A1 (en) 2017-09-08 2018-08-30 A backing pad arrangement for an abrading system, and the abrading system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FI20175800A FI20175800A1 (en) 2017-09-08 2017-09-08 A backing pad arrangement for an abrading system, and the abrading system

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Publication Number Publication Date
FI20175800A1 true FI20175800A1 (en) 2019-03-09

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FI20175800A FI20175800A1 (en) 2017-09-08 2017-09-08 A backing pad arrangement for an abrading system, and the abrading system

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EP (1) EP3678819A4 (en)
FI (1) FI20175800A1 (en)
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WO (1) WO2019048732A1 (en)

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US11780056B2 (en) * 2017-02-13 2023-10-10 Mirka Ltd Conduit arrangements in intermediate pad, backing pad, and abrading article for extracting abrading debris
CN110328589B (en) * 2019-08-06 2021-11-26 王君 Furniture flat plate sander capable of generating negative air pressure through eccentric vibration rotation
EP4063069B1 (en) 2021-03-23 2022-12-07 Andrea Valentini Plate-like backing pad adapted for releasable attachment to a hand-held polishing or sanding power tool
DE102021121566A1 (en) 2021-08-19 2023-02-23 Festool Gmbh plate tool

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US2573411A (en) * 1948-06-03 1951-10-30 Michel Frank De Abrasive disk backup pad
US2807918A (en) * 1956-08-27 1957-10-01 Theodore A Rupp Sanding disc
US3151425A (en) * 1962-07-24 1964-10-06 Skil Corp Sanding pad
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US20200353593A1 (en) 2020-11-12
WO2019048732A1 (en) 2019-03-14
EP3678819A4 (en) 2021-05-26
TWI810203B (en) 2023-08-01
EP3678819A1 (en) 2020-07-15
TW201919820A (en) 2019-06-01

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