DK181656B1 - An abrasion system, a holding device for abrasive strips and a method for securing abrasive strips in an abrasion system - Google Patents
An abrasion system, a holding device for abrasive strips and a method for securing abrasive strips in an abrasion system Download PDFInfo
- Publication number
- DK181656B1 DK181656B1 DKPA202370101A DKPA202370101A DK181656B1 DK 181656 B1 DK181656 B1 DK 181656B1 DK PA202370101 A DKPA202370101 A DK PA202370101A DK PA202370101 A DKPA202370101 A DK PA202370101A DK 181656 B1 DK181656 B1 DK 181656B1
- Authority
- DK
- Denmark
- Prior art keywords
- disc
- radial grooves
- contact surface
- chuck
- collar
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims abstract description 11
- 238000005299 abrasion Methods 0.000 title abstract description 18
- 238000007373 indentation Methods 0.000 description 13
- 239000000463 material Substances 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000004033 plastic Substances 0.000 description 6
- 239000004744 fabric Substances 0.000 description 3
- 238000010146 3D printing Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000004411 aluminium Substances 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000003028 elevating effect Effects 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 241000239290 Araneae Species 0.000 description 1
- 229910001369 Brass Inorganic materials 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 230000001010 compromised effect Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000002991 molded plastic Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- AFJYYKSVHJGXSN-KAJWKRCWSA-N selamectin Chemical compound O1[C@@H](C)[C@H](O)[C@@H](OC)C[C@@H]1O[C@@H]1C(/C)=C/C[C@@H](O[C@]2(O[C@@H]([C@@H](C)CC2)C2CCCCC2)C2)C[C@@H]2OC(=O)[C@@H]([C@]23O)C=C(C)C(=N\O)/[C@H]3OC\C2=C/C=C/[C@@H]1C AFJYYKSVHJGXSN-KAJWKRCWSA-N 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D13/00—Wheels having flexibly-acting working parts, e.g. buffing wheels; Mountings therefor
- B24D13/14—Wheels having flexibly-acting working parts, e.g. buffing wheels; Mountings therefor acting by the front face
- B24D13/16—Wheels having flexibly-acting working parts, e.g. buffing wheels; Mountings therefor acting by the front face comprising pleated flaps or strips
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D13/00—Wheels having flexibly-acting working parts, e.g. buffing wheels; Mountings therefor
- B24D13/20—Mountings for the wheels
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D7/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting otherwise than only by their periphery, e.g. by the front face; Bushings or mountings therefor
- B24D7/06—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting otherwise than only by their periphery, e.g. by the front face; Bushings or mountings therefor with inserted abrasive blocks, e.g. segmental
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D7/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting otherwise than only by their periphery, e.g. by the front face; Bushings or mountings therefor
- B24D7/06—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting otherwise than only by their periphery, e.g. by the front face; Bushings or mountings therefor with inserted abrasive blocks, e.g. segmental
- B24D7/066—Grinding blocks; their mountings or supports
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D7/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting otherwise than only by their periphery, e.g. by the front face; Bushings or mountings therefor
- B24D7/16—Bushings; Mountings
-
- 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
- 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)
- Polishing Bodies And Polishing Tools (AREA)
Abstract
Disclosed is an abrasion system (9) comprising rotational drive means (7), and a holding device (1) holding abrasive strips (2). The holding device (1) comprises a disc (3) including a number of undercut radial grooves (4) formed in a front surface (5) of the disc (3), wherein the undercut radial grooves (4) are extending from a periphery (8) of the disc (3) towards a centre (10) of the disc (3). The disc (3) further comprises a connection shaft (11) extending from a back surface (6) of the disc (3), wherein the front surface (5) is opposite the back surface (6), and wherein the abrasive strips (2) are arranged in one or more of the number of undercut radial grooves (4). The disc (3) also comprises a locking part (12) being releasably connected to the disc (3), wherein the locking part (12) comprises a base part (13) extending across the back surface (6), and a collar part (14) extending from the base part (13) towards the front surface (5) so that the collar part (14) blocks at least a part of each of the number of undercut radial grooves (4) at the periphery (8) of the disc (3), wherein the base part (13) further comprises a hole (15) through which the connection shaft (11) is extending so that a contact surface (16) for the rotational drive means (7) is formed by the base part (13) around the connection shaft (11). The rotational drive means (7) is connected to the connection shaft (11) by means of a chuck (17) of the rotational drive means (7) and the free end of the chuck (17) is arranged in contact with the contact surface (16) or in close proximity of the contact surface (16). A holding device (1), use of a holding device (1) and a method for securing abrasive strips (2) in an abrasion system (9) is also disclosed.
Description
DK 181656 B1 1
AN ABRASION SYSTEM, A HOLDING DEVICE FOR ABRASIVE STRIPS AND A METHOD FOR
SECURING ABRASIVE STRIPS IN AN ABRASION SYSTEM
The invention relates to an abrasion system comprising rotational drive means, and a holding device holding abrasive strips. The holding device comprises a locking part and a disc including a number of undercut radial grooves in which abrasive strips may be inserted. The invention also relates to a method for securing abrasive strips in an abrasion system.
Abrasive tools — such as abrasive discs, drums, cones, sheets or cubs — are know in many shapes and sizes and used for many different purposes such as grinding, polishing, lapping, sanding and other.
From the international patent applications WO 2017/207008 Al and WO 2017/207007 Al it is known to form an abrasive tool by means of a holding device having undercut grooves extending radially in which abrasive strips are inserted.
Once the abrasive strips are worn, they may be pulled out of the radial grooves and replace by new ones. During use the disc rotates at high-speed while being pressed firmly against and moved across the surface to be grinded. Thus, it is important that the strips cannot be flung out of the grooves during use and the WO 2017/207008 A1 and WO 2017/207007 Al therefore disclose that a mounting portion 3 - fastened directly to a drive shaft - is connected to a tool portion blocking the open ends of grooves so that the strips cannot leave the grooves. However, this design is complex and rather unsecure.
An object of the invention is therefore to provide for a simpler and more secure technique for holding abrasive strips.
DK 181656 B1 2
The invention provides for an abrasion system comprising rotational drive means, and a holding device holding abrasive strips. The holding device comprises a disc including a number of undercut radial grooves formed in a front surface of the disc, wherein the undercut radial grooves are extending from a periphery of the disc towards a centre of the disc. The disc further comprises a connection shaft extending from a back surface of the disc, wherein the front surface is opposite the back surface, and wherein the abrasive strips are arranged in one or more of the number of undercut radial grooves. The holding device also comprises a locking part being releasably connected to the disc, wherein the locking part comprises a base part extending across the back surface, and a collar part extending from the base part towards the front surface so that the collar part blocks at least a part of each of the number of undercut radial grooves at the periphery of the disc, wherein the base part — further comprises a hole through which the connection shaft is extending so that a contact surface for the rotational drive means is formed by the base part around the connection shaft. The rotational drive means is connected to the connection shaft by means of a chuck of the rotational drive means and the free end of the chuck is arranged in contact with the contact surface or in close proximity of the contact — surface.
Providing the holding device with a locking device having a collar part blocking the open ends of the undercut radial grooves is advantageous in that this ensures that the abrasive strips stays secured in the grooves. And releasably connecting the locking part to the disc is advantageous in that the locking part hereby easily can be removed to provide access to the grooves — e.g., when the abrasive strips are worm out and need to be replaced. However, given the rough handling the holding device is exposed to during use there is a risk of the locking part releasing itself from the disc during use and it is therefore advantageous to make the base part of the locking part extend across the back surface so that a contact surface is formed by the base part
DK 181656 B1 3 around the connection shaft. Thus, by connecting the chuck of the rotational drive means to the connection shaft so that the free end of the chuck is in contact with the contact surface or at least in close proximity of the contact surface, the chuck will ensure, that even if the locking part is released from the disc during use it cannot move so far back that the grooves are no longer at least partly blocked. Le., by designing the locking part with a contact surface for the free end of the chuck surrounding the connection shaft, the abrasion system is in a simple manner provided with an integrated fail-safe preventing the abrasive strips from leaving the grooves even if the releasable connection fails during use.
In this context the term “rotational drive means” is to be understood as any kind of rotational driver capable of rotating the connection shaft and thereby the holding device. Le., the term includes any kind of power drill, angle grinder, electrical screwdriver, a dedicated motor or any other device comprising a motor or a similar device capable of being connected to the connection shaft and rotating it.
It should also be emphasised that the term “chuck” is to be understood as any kind of attachment for holding the connection shaft e.g. through clamping, wedging, through engaging threaded parts, through engaging bayonet parts or other. Le. the term includes any kind of drill chuck, clamping chuck, spiders, magnetic chuck, vacuum chuck, Special Direct System (SDS) or similar.
In an aspect of the invention, the locking part is releasably connected to the disc through a disc threaded part of the disc and a lock threaded part of the locking part being mutually engaged, or through a disc bayonet part of the disc and a lock bayonet part of the locking part being mutually engaged.
Providing the disc with a disc threaded part or a disc bayonet part arranged to engage a corresponding lock threaded part or lock bayonet part of the locking part is advantageous in that this ensures that the disc and the locking part can easily be
DK 181656 B1 4 assembled and disassembled — e.g., during replacement of the abrasive strips — while at the same time ensuring that the disc and the locking part remains connected during use.
In an aspect of the invention, the base part comprises a contact collar projecting in a direction away from the back surface, wherein the contact collar is surrounding the connection shaft and wherein the contact surface is formed by the free end surface of the contact collar.
Providing the base part with a contact collar elevating the contact surface of the back side of the base part is advantageous in that It hereby is possible to make the area underneath the contact surface thicker and thereby more sturdy and strong so that it does not break when the chuck is pressed against the contact surface — without having to increase the thickness and the strength of the entire base part. Furthermore, by elevating the contact surface by means of a contact collar surrounding the connection shaft, the connection shaft is better supported and guided - thus ensuring that the holding device runs true when assembled. Even further, the elevated contact surface ensures that the user more easily and with greater certainty can observe and establish that the free end of the chuck is arranged in contact with the contact surface — or in close proximity of the contact surface when the user connects the chuck to the connection shaft.
In an aspect of the invention, the contact collar is projecting a contact collar distance of between 2 mm and 40 mm, preferably between 4 mm and 30 mm, and most — preferred between 7 mm and 20 mm in the direction away from the back surface.
If the contact collar is projecting too little, the contact surface could become too weak, the connection shaft is not sufficiently supported, and it becomes more difficult to observe if the chuck is placed correctly in relation to the contact surface.
However, if the contact collar is projecting too much, the total length of the holding
DK 181656 B1 device increases so much that the risk of it running untrue increases and the additional length will increase the cost of the holding device. Thus, the present distance ranges present an advantageous relationship between functionality, cost, and safety. 5
In an embodiment, the disc and the locking part are made of a plastic material and wherein the connection shaft is made of metal.
Plastic is inexpensive, light and easy to mould and it is therefore advantageous to form the disc and the locking part of a plastic material. This also enables that the more complex parts — i.e., the disc and the locking part — may be formed e.g., by 3D printing. However, during use the connection shaft is heavily strained and it therefore advantageous to make the shaft of metal to ensure sufficient strength to transfer the necessary torque and to accept any transvers forces generated during use when the rotating holding device is pressed firmly against a surface.
In an embodiment, the connection shaft is concentric with the centre of the disc.
Arranging the connection shaft concentric with the centre of the disc is advantageous in that it this reduces the risk of any run-out of the disc and it makes it easier to design and connect the locking part to the disc.
In an aspect of the invention, the connection shaft has a shaft length of between 10 mm and 100 mm, preferably between 15 mm and 70mm, and most preferred between 20 mm and 50 mm as measured from the contact surface to a free end of the connection shaft.
If the connection shaft is too short, it will be difficult for the chuck to secure a strong hold on the connection shaft and if the connection shaft is too long, the risk of the free end of the connection shaft hitting the bottom of a chuck before the free end of
DK 181656 B1 6 the chuck is contact with the contact surface or in close proximity of the contact surface increases. Thus, the present length ranges are advantageous in relation to functionality.
In an aspect of the invention, the greatest lateral extent of the hole is a maximum of 20%, preferably 10% and most preferred 5% bigger than the greatest lateral extent of the connection shaft at the hole.
If the hole is too small, it becomes more difficult to fit the locking part on the disc.
However, if the hole becomes too big, the contact surface is so far from the connection shaft that its function as a fail-safe is compromised. Thus, the present hole ranges are advantageous in relation to functionality.
In an embodiment, the greatest lateral extent of the free end of the chuck is bigger than the greatest lateral extent of the hole in the base part.
Forming the hole so it is smaller than the greatest lateral extent of the free end of the chuck is advantageous in that it hereby is ensured that the contact surface surrounding the hole always will hit the free end of the chuck if the locking part unintentionally releases from the disc during use.
In an aspect of the invention, the free end of the chuck is arranged in contact with the contact surface or a maximum chuck distance of 15 mm, preferably 12 mm, and most preferred 8 mm from the contact surface.
The bigger the maximum chuck distance is, the longer the collar part of the locking part has to be to ensure that it overlaps the grooves even if the locking part releases unintentionally from the disc during use. Thus, if the maximum chuck distance is too big, the fail-safe function of the chuck being arranged close to the contact surface — will not work or the cost of the locking part will increase — due to the long collar part
DK 181656 B1 7 — and/or the long collar part could hinder access to the full length of the abrasive strips during normal use. Thus, the present maximum chuck distances are advantageous in relation to safety, cost and functionality.
In an aspect of the invention, the collar part blocks at least a part of each of the number of undercut radial grooves by overlapping the number of undercut radial grooves by an overlap distance which is greater that a chuck distance between the free end of the chuck and the contact surface.
Making the collar part overlap the grooves more than the chuck distance between the free end of the chuck and the contact surface is advantageous in that even if the locking part unintentionally releases from the disc during use that collar part can never move so far back that the grooves are not at least partly covered. Thus, a more secure fail-safe is hereby formed.
The invention further relates to a holding device for abrasive strips. The holding device comprises a disc including a number of undercut radial grooves formed in a front surface of the disc, wherein the undercut radial grooves are extending from a periphery of the disc towards a centre of the disc. The disc further comprising a — connection shaft arranged for connecting the disc to rotational drive means, wherein the connection shaft is extending from a back surface of the disc and wherein the front surface is opposite the back surface. The holding device also comprises a locking part being releasably connected to the disc, wherein the locking part comprises a base part extending across the back surface and a collar part extending from the base part towards the front surface so that the collar part blocks at least a part of each of the number of undercut radial grooves at the periphery of the disc, wherein the base part further comprises a hole through which the connection shaft is extending so that a contact surface for the rotational drive means is formed by the base part around the connection shaft.
DK 181656 B1 8
Making the connection shaft extend through a hole in the base part of the locking part, so that a contact surface for rotational drive means is formed by the base part around the connection shaft, is advantageous in that the holding device hereby is provided with an additional safety feature enabling that the collar part of the locking disc will overlap at least a part of each of the grooves even if the locking part unintentionally releases from the disc during use as long as the front end of the rotational drive means — typically a drill chuck or similar — is positioned against or very near the contact surface when the rotational drive means are connected to the connection shaft.
Even further, the invention relates to a method for securing abrasive strips in an abrasion system. The method comprises the steps of: e sliding one or more abrasive strips into one or more undercut radial grooves formed in a front surface of a disc, wherein the one or more abrasive strips are slid into the one or more undercut radial grooves from a periphery of the disc towards a centre of the disc, e releasably connecting a locking part to the disc, so that a collar part of the locking part blocks at least a part of each of the number of undercut radial grooves at the periphery of the disc, wherein the locking part comprises a base part extending across a back surface of the disc, wherein the front surface is opposite the back surface, and so that a connection shaft extending from a back surface of the disc is extending through a hole in the base part, and e connecting rotational drive means to the connection shaft by means of a chuck of the rotational drive means so that the free end of the chuck is in contact with a contact surface formed by the base part around the connection shaft or in close proximity of the contact surface.
Connecting the locking part releasably to the disc is advantageous in that it hereby is — easy to replace worn out abrasive strips by releasing the locking part from the disc to
DK 181656 B1 9 unblock the grooves. And connecting the rotational drive means to the connection shaft so that the free end of the chuck is in contact with a contact surface formed by the base part around the connection shaft or so that the free end of the chuck is in close proximity of the contact surface is advantageous in that it hereby is ensured that the locking part cannot travel enough backwards that the grooves will be unblocked during use for the abrasive strips to be flung out of the grooves.
The invention will be described in the following with reference to the figures in which fig. 1 illustrates a holding device, as seen in an isometric view, fig. 2 illustrates a cross section through the middle of a holding device, as seen in from the side, fig. 3 illustrates an abrasion system, as seen in from the side, fig. 4 illustrates a disc, as seen in a first isometric view, fig. 5 illustrates a disc, as seen in a second isometric view, fig. 6 illustrates a locking part, as seen in a first isometric view, and fig. 7 illustrates a locking part, as seen in a second isometric view.
DK 181656 B1 10
Fig. 1 illustrates a holding device 1, as seen in an isometric view and fig. 2 illustrates a cross section through the middle of a holding device 1, as seen in from the side.
In this embodiment the holding device 1 is basically made from three parts: a disc 3, a connection shaft 11 rigidly connected to the disc 3, and a locking part 12 releasably connected to the disc 3. However, during operation the holding device 1 would obviously also comprise abrasive strips 2 as discussed in the following and in another embodiment the holding device 1 could comprise more parts — e.g, if the disc 3 — and/or the locking part 12 was formed by two or more interconnected parts. And/or the connection shaft 11 could be formed integrally with the disc 3 so that the holding device 1 would only comprise 2 parts.
In this embodiment the disc 3 and the locking part 12 are made by 3D printing of a — plastic material. However, in another embodiment the disc 3 and/or the locking part 12 could also or instead be made of steel, stainless steel, aluminium and/or another metal, a composite material - e.g., fibre reinforced - or any combination thereof and/or the disc 3 and/or the locking part 12 could be made by moulding, machining or another process or any combination thereof.
In this embodiment the shaft 11 is made of metal in the form of steel to be able to transfer the torque and bending moments during use but in another embodiment the shaft could be made of brass, stainless steel, a fibre reinforces resin material, a composite material, a plastic material or other or any combination thereof.
In this embodiment the disc 3 is formed with eight evenly distributed undercut radial grooves 4 formed in a front surface 5 of the disc 3. However, in another embodiment the undercut radial grooves 4 could be distributed or angled differently and/or the disc 3 could comprise more radial grooves 4 — such as ten, fourteen, seventeen or even more — or the disc 3 could comprise fewer radial grooves 4 — such as seven,
DK 181656 B1 11 five, four or even fewer. In this embodiment the undercut radial grooves 4 are extending from a periphery 8 of the disc 3 towards a centre 10 of the disc 3 at which the grooves 4 stops just before the centre. However in another embodiment the radial grooves 4 could continue all the way or at least closer to the centre 10. In this embodiment the disc 3 further comprises a connection shaft 11 extending from a back surface 6 of the disc 3 and in this embodiment the disc 3 is formed with a non- circular engagement indentation 27 in the form of a hexagonal blind hole formed in the front surface 5 of the disc 3. In this embodiment one end of the connection shaft 11 is provided with a matching external non-circular engagement structure 31 in the — form of a head 26 having a hexagonal shape — like on a standard bolt — so that when the connection shaft 11 is fitted in the disc 3, the connection shaft 11 and the disc 3 are locked against mutual rotation. To ensure that the connection shaft 11 is also rigidly connected to the disc 3 axially, adhesive is provided between the external non-circular engagement structure 31 and the non-circular engagement indentation 27 to hold them together so that the connection shaft 11 does not release from the disc 3 during use and handling of the holding device 1. However, in another embodiment the external non-circular engagement structure 31 of the connection shaft 11 could be connected to the non-circular engagement indentation 27 of the disc 3 by means of a radially extending set screw in the disc 3 engaging the external non-circular engagement structure 31, a radially extending head screw, a dedicated holding device, a bayonet coupling device or other or any combination thereof. Or as previously explained the connection shaft 11 could be formed integrally with the disc 3 or in another embodiment the connection shaft 11 would not comprise an external non-circular engagement structure 31 and the disc 3 would not comprise a non- circular engagement indentation 27, and the disc 3 and the connection shaft 11 would instead be connected through welding, soldering, shrink-fitting, screws or other.
It should be noted that the non-circular engagement indentation 27 may be any kind of non-circular hole. Le. the non-circular engagement indentation 27 may have the form of a hole with an inner structure, e.g. a polygonal shaped hole, a star shaped
DK 181656 B1 12 hole, a rectangular hole, a hole with one or more depressions in a cylindrical inner face or other or any combination thereof. The external non-circular engagement 31 structure may likewise be any kind of non-circular protrusion. Le. the external non- circular engagement structure 31 may have the form of a protrusion with an external polygonal shape, a star shape, a rectangular shape, a cylindrical shape with one or more protrusions from the cylindrical outer face or other or any combination thereof.
The non-circular engagement indentation 27 matches the external non-circular engagement structure 31 in a way so that the external non-circular engagement structure 31 can be inserted via an axial displacement in the non-circular engagement indentation 27. When inserted, the non-circular engagement indentation 27 and the external non-circular engagement structure 31 are mutually locked so that they will rotate together. I e., it is understood that non-circular refers to any cross-sectional shape of the hole of the non-circular engagement indentation 27 and the rod of the external non-circular engagement structure 31 which deviates from a geometric circle. For example, the internal and external engagement structures 27, 31 may be in the form of inner and outer gears, respectively, have a cross-sectional shape in the form of a corrugated circle, i.e., non-circular. Accordingly, the function of the non- circular shape is to rotatably lock the non-circular engagement indentation 27 and the external non-circular engagement structure 31. That is, the engagement structures — can be seen as deviations from a circle shape which prohibits rotation of the disc 3 with respect to the inserted head 26 of the connection shaft 11.
In this embodiment the connection shaft 11 is arranged concentric with the centre 10 of the disc 3 so that the disc and the locking part 12 can be formed rotationally symmetrical so that they can be separated from each other by rotation. However, in another embodiment the connection shaft 11 could be arranged eccentrically in relation to the centre 10 of the disc 3 if an eccentrical abrasion motion was desired.
But then the locking part 12 should be releasably connected to the disc 3 by means of something that would accept only axial motion — such as a snap lock or similar.
DK 181656 B1 13
In this embodiment the locking part 12 is releasably connected to the disc 3 through a disc threaded part 18 of the disc 3 engaging a lock threaded part 19 of the locking part 12 so that the locking part 12 may be released from the disc 3 by rotating the locking part 12 in relation to the disc 3 to unscrew the locking part. However, in another embodiment the locking part 12 could be is releasably connected to the disc 3 through one or more disc bayonet parts of disc 3 engaging one or more corresponding lock bayonet parts of the locking part 12, or the locking part 12 could be releasably connected to the disc 3 through one or more quick-release couplings, through corresponding press fastener parts, snap fastener parts or other ensuring that the locking part 12 is connected to the disc 3 during use but also ensuring that the locking part 12 can easily be released from the disc 3 e.g., when the abrasive strips 2 need to be exchanged.
In this embodiment the locking part 12 is formed with a base part 13 extending across the entire back surface 6 of the disc 3 and the base part 13 is provided with a hole 15 through which the connection shaft 11 is extending so that a contact surface 16 is formed by the base part 13 around the connection shaft 11 - the contact surface 16 will be discussed in more details in relation to fig. 3. However, in another embodiment the base part 13 would not be extending across the entire back surface 6 ofthe disc 3 — e.g, if the base part 13 was provided with further openings, such as a sprocket design, a cross design or other. In this embodiment the locking part 12 is also provided with a collar part 14 extending from the base part 13 towards the front surface 5 of the disc 3 (when assembled) so that the collar part 14 blocks each of the number of undercut radial grooves 4 at the periphery 8 of the disc 3. In this embodiment the length of the collar part 14 is substantially equal to the thickness of the disc 3 — as can be seen in fig. 2 — so that the free edge 21 of the collar part 14 is substantially flush with the front surface 5 of the disc 3 when the disc 3 and the locking part 12 are assembled as illustrated in fig. 2. Le, in this embodiment the collar part 14 blocks the undercut radial grooves 4 with an overlap distance OD — which is substantially equal to the entire axial extent of the undercut radial grooves 4.
DK 181656 B1 14
However, in another embodiment the collar part 14 could be shorter so that only a part of each of the undercut radial grooves 4 would be blocked by the collar part 14 — i.e., the overlap distance OD could be shorter — or the collar part 14 could be longer so that the free edge 21 of the collar part 14 would extend beyond the front surface 5 ofthe disc 3 —1i.e., the overlap distance OD could be longer and each of the undercut radial grooves 4 would be fully blocked by the collar part 3.
In this embodiment the greatest lateral extent GEH of the hole 15 in the base part 13 - 1.e., the diameter of the hole 15 in that the hole 15 in this embodiment is circular — is around 1% bigger than the greatest lateral extent GES of the connection shaft 11 — i.e., the diameter of the connection shaft 11 in that the connection shaft 11 in this embodiment is cylindrical — so that the connection shaft 11 is supported by the hole but in another embodiment the greatest lateral extent GEH of the hole 15 could be bigger or smaller in relation to the greatest lateral extent GES of the connection shaft 15 11. However, in another embodiment the hole 15 and/or the connection shaft 11 could be other than round — e.g., in another embodiment the connection shaft 11 could be hexagonal to fit in a standard or a custom-made bit holder. However, if the locking part 12 is releasably connected to the disc 3 through means that requires that the parts 3, 12 are rotated in relation to each other to be released, it is obviously important that the shape of the hole 15 and the connection shaft 11 does not mutually geometrically lock.
Furthermore, it is important that the greatest lateral extent GEH of the hole 15 does not become so big in that the contact surface 16 surrounding the hole 15 becomes bigger than the greatest lateral extent of the free end of chuck 25, so that unintended axial movement of the locking part 12 in relation to the disc 3 will not be limited by the contact surface 16 hitting the free end of chuck 25.
Fig. 3 illustrates an abrasion system 9 with a partial cutout in the locking part 12 and — across section through the middle of a chuck 17, as seen in from the side.
DK 181656 B1 15
In this embodiment the holding device 1 of the abrasion system 9 is illustrated with only one abrasive strip 2 in one undercut radial groove 4, however during normal use of the holding device 1 and the abrasion system 9 as an abrasive tool, abrasive strips 2 would normally be provided in all the undercut radial grooves 4.
In this embodiment the abrasive strip 2 comprises an abrasive cloth 29 which on the backside is supported by bristles 30 made of a plastic material and the abrasive cloth 29 and the bristles 30 are mounted in and connected to a base 28 comprising bend sheet metal. However, in another embodiment the abrasive strip 2 could also or instead comprise abrasive paper, wire brushes or other, the bristles 30 could be made from natural hair, metal, or the bristles 30 could be omitted and/or the base 28 could be moulded plastic, an extruded aluminium rail or other or any combination thereof.
In this embodiment the undercut radial grooves 4 are formed as tracks that are wider at the bottom of the tracks than at the front surface 5 of the disc 3 and in this embodiment the base 28 of the abrasive strips 2 have substantially the same shape as the undercut radial grooves 4 so that the abrasive strips 2 may be slid into the undercut radial grooves 4 from the periphery 8 of the disc 3 and so that the abrasive strips 2 are substantially locked against axial displacement when mounted in the undercut radial grooves 4. However, in another embodiment the undercut radial grooves 4 and/or the base 28 of the abrasive strips 2 could have another shape, such as dovetail shape, an undercut circle, the bottom of the tracks could be wider or have another shape or the undercut radial grooves 4 and/or the base 28 of the abrasive — strips 2 could be formed in numerous other ways ensuring that the strips 2 are axially locked in the undercut radial grooves 4.
In this embodiment rotational drive means 7 in the form of a power drill are connected to the connection shaft 11 by means of a chuck 17 which in this case is a standard drill chuck. However, in another embodiment the rotational drive means 7
DK 181656 B1 16 could be any other type of drill, it could be an angle grinder, a dedicated device or other and/or the chuck 17 could be any other kind of known standard chucks 17 or it could be a dedicated chuck 17 e.g., specifically designed to correspond to a specific connection shaft 11 design.
In this embodiment the free end 25 of the chuck 17 is arranged in close proximity of the contact surface 16 in that the chuck 17 is connected to the connection shaft 11 so that in this embodiment the free end 25 of the chuck 17 is arranged in a chuck distance DCD of 2 mm from the contact surface 16. However, in another embodiment the chuck 17 could be connected to the connection shaft 11 so that in the free end 25 of the chuck 17 was arranged greater chuck distance DCD — such as 3 mm, 6 mm, 10 mm or even more — or the chuck distance DCD could be smaller — such as 1.5 mm, 1 mm, 0.5 mm or even less or the free end 25 of the chuck 17 could be arranged in a chuck distance DCD of 0 mm so that the free end 25 of the chuck 17 — would be in contact with the contact surface 16.
However, to ensure that the locking part 12 cannot move so far back — if it unintentionally releases from the disc 3 during use — that the collar part 14 of the locking part 12 no longer blocks the undercut radial grooves 4 it is important that the — overlap distance OD — 1.e., the distance from the front free edge 21 of the collar part 14 to the bottom of the undercut radial grooves 4 - is greater that a chuck distance
DCD 10 — i.e., the distance DCD between the free end 25 of the chuck 17 and the contact surface 16.
In an embodiment the connection shaft 11 could be provided with an indentation, a line, a colour marking or another marking indicating the maximum chuck distance
DCD between the free end 25 of the chuck 17 and the contact surface 16 that can be accepted given the actual overlap distance OD by which the collar part 14 actually overlaps the undercut radial grooves 4.
DK 181656 B1 17
In this embodiment the connection shaft 11 has a shaft length SL of around 35 mm to ensure that the chuck 17 overlaps the connection shaft 11 so much that a strong and true hold is secured while at the same time ensuring that the free end 24 of the connection shaft 11 is not hitting the bottom of the chuck 20 before the free end 25 of — the chuck 17 is contact with the contact surface 16 or at least in close proximity of the contact surface 16. However, in another embodiment the shaft length SL of the connection shaft 11 could be longer — such as 38 mm, 42 mm, 46 mm or even longer — or it could be shorter — such as 32 mm, 29 mm, 26 mm or even shorter — e.g, depending on the specific use, the specific chuck 17 or other.
In this embodiment the base part 13 comprises a contact collar 22 by means of which the contact surface 16 surrounding the hole 15 is elevated in relation to the rest of the base part. I e., in this embodiment the contact collar 22 is surrounding the connection shaft 11 and projecting in a direction away from the back surface 6 so that the — contact surface 16 is moved up to the free end surface 23 of the contact collar 22. In this embodiment the contact collar 22 is projecting a contact collar distance CD of 13 mm in the direction away from the back surface 6 of the disc 3 from the back of the base part 13. However, in another embodiment the contact collar distance CD could be shorter — such as 11 mm, 9 mm, 7 mm or even shorter — or the contact collar — distance CD could be longer — such as 16 mm, 18 mm, 21 mm or even longer e.g, depending on the specific use, the specific size of the holding device 1 or other.
In this embodiment the abrasive strips 2 are secured in the abrasion system 9 by the following method. With the locking part 12 removed from the undercut radial grooves 4 the abrasive strips 2 are first slid into one or more of the undercut radial grooves 4 from the periphery 8 of the disc 3 towards the centre 10 of the disc 3. The locking part 12 is then releasably connected to the disc 3, so that the collar part 14 of the locking part 12 blocks at least a part of each of the undercut radial grooves and so that the connection shaft 11 is extending through the hole 15 in the base part 13. — After this the chuck 17 of the rotational drive means 7 is connected to the connection
DK 181656 B1 18 shaft so that the free end 25 of the chuck 17 is in contact with the contact surface 16 on the base part 13 of the locking part 12 or so that the free end 25 of the chuck 17 is in close proximity of the contact surface 16.
Fig. 4 illustrates a disc 3, as seen in a first isometric view, fig. 5 illustrates a disc 3, as seen in a second isometric view, fig. 6 illustrates a locking part 12, as seen in a first isometric view, and fig. 7 illustrates a locking part 12, as seen in a second isometric view.
In this embodiment the locking part 12 is provided with a lock threaded part 19 projecting from the inside surface of the base part 13 (see fig. 7) and the disc 3 is provided with a corresponding disc threaded part 18 formed in back surface 6 of the disc 3 (see fig. 4) enabling that the locking part 12 can be releasably connected to the disc 3 by engaging the treaded parts 18, 19 through rotation. However, in another embodiment the lock threaded part 19 could be arranged on the inside of the collar part 14 and the disc threaded part 18 could be formed on the peripheral side of the disc 3.
In this embodiment both the disc 3 and the locking part 12 are formed with a substantially circular cross section — as seen in an axial direction — which enables that the parts 3, 12 can be releasably connected through mutual rotation. However, in another embodiment could also or instead be provided with an oval cross section, a polygonal cross section — e.g., eight sided, twelve sided, twenty sided or more — or with another cross-sectional shape.
The invention has been exemplified above with reference to specific examples of holding devices 1, discs 3, locking parts 12 and other. However, it should be understood that the invention is not limited to the particular examples described above but may be designed and altered in a multitude of varieties within the scope of the invention as specified in the claims.
DK 181656 B1 19
List 1. Holding device 2. Abrasive strip 3. Disc 4. Undercut radial groove 5. Front surface of disc 6. Back surface of disc 7. Rotational drive means 8. Periphery of disc 9. Abrasion system 10. Centre of disc 11. Connection shaft 12. Locking part 13. Base part 14. Collar part 15. Hole 16. Contact surface 17. Chuck 18. Disc threaded part 19. Lock threaded part 20. Bottom of chuck 21. Free edge of collar part 22. Contact collar 23. Free end surface of contact collar 24. Free end of connection shaft 25. Free end of chuck 26. Head 27. Non-circular engagement indentation 28. Base of abrasive strip
DK 181656 B1 20 29. Abrasive cloth 30. Brush 31. External non-circular engagement structure
CD. Contact collar distance
SL. Shaft length
GEH. Greatest lateral extent of hole
GES. Greatest lateral extent of connection shaft
DCD. Chuck distance
OD. Overlap distance
Claims (10)
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DKPA202370101A DK181656B1 (en) | 2023-02-24 | 2023-02-24 | An abrasion system, a holding device for abrasive strips and a method for securing abrasive strips in an abrasion system |
| PCT/DK2024/050033 WO2024175161A1 (en) | 2023-02-24 | 2024-02-22 | A holding device for abrasive strips and use of a holding device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DKPA202370101A DK181656B1 (en) | 2023-02-24 | 2023-02-24 | An abrasion system, a holding device for abrasive strips and a method for securing abrasive strips in an abrasion system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| DK202370101A1 DK202370101A1 (en) | 2024-09-10 |
| DK181656B1 true DK181656B1 (en) | 2024-09-10 |
Family
ID=90105299
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DKPA202370101A DK181656B1 (en) | 2023-02-24 | 2023-02-24 | An abrasion system, a holding device for abrasive strips and a method for securing abrasive strips in an abrasion system |
Country Status (2)
| Country | Link |
|---|---|
| DK (1) | DK181656B1 (en) |
| WO (1) | WO2024175161A1 (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB708183A (en) * | 1950-12-22 | 1954-04-28 | Engis Ltd | Improvements in rotary abrasion and/or polishing tools |
| DE2411749A1 (en) * | 1974-03-12 | 1975-09-25 | Festo Maschf Stoll G | Hand operated rotary powered disc grinder - has bunched abrasive paper grinding elements inset into the grinding disc |
| US4493170A (en) * | 1981-11-19 | 1985-01-15 | The Boeing Company | Abrading tool |
| US20040180613A1 (en) * | 2002-10-10 | 2004-09-16 | Poul Lundum | Abrading machine with abrading discs, which are moved in a reciprocatory movement transverse to an item |
| KR20110056043A (en) * | 2009-11-20 | 2011-05-26 | 삼성중공업 주식회사 | Polishing wheel assembly and polishing apparatus comprising the same |
| US20150306738A1 (en) * | 2004-05-21 | 2015-10-29 | Diamabrush Llc | Low pressure polishing method and apparatus |
| CN205166722U (en) * | 2015-11-10 | 2016-04-20 | 青岛威特动力木业机械有限公司 | Quick assembly disassembly sand light brush dish |
| US20170165811A1 (en) * | 2015-12-09 | 2017-06-15 | Kolthoff Gabrovo Eood | Tool for Fine Machining of Surfaces |
| WO2017207008A1 (en) * | 2016-05-31 | 2017-12-07 | Kadicma Aps | Tool with tool elements |
| WO2020035120A1 (en) * | 2018-08-16 | 2020-02-20 | Flex Trim A/S | Rotary machining unit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DK178917B1 (en) | 2016-05-31 | 2017-05-22 | Kadicma Aps | Bayonet coupling and machining unit with such bayonet coupling |
-
2023
- 2023-02-24 DK DKPA202370101A patent/DK181656B1/en active IP Right Grant
-
2024
- 2024-02-22 WO PCT/DK2024/050033 patent/WO2024175161A1/en unknown
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|---|---|---|---|---|
| GB708183A (en) * | 1950-12-22 | 1954-04-28 | Engis Ltd | Improvements in rotary abrasion and/or polishing tools |
| DE2411749A1 (en) * | 1974-03-12 | 1975-09-25 | Festo Maschf Stoll G | Hand operated rotary powered disc grinder - has bunched abrasive paper grinding elements inset into the grinding disc |
| US4493170A (en) * | 1981-11-19 | 1985-01-15 | The Boeing Company | Abrading tool |
| US20040180613A1 (en) * | 2002-10-10 | 2004-09-16 | Poul Lundum | Abrading machine with abrading discs, which are moved in a reciprocatory movement transverse to an item |
| US20150306738A1 (en) * | 2004-05-21 | 2015-10-29 | Diamabrush Llc | Low pressure polishing method and apparatus |
| KR20110056043A (en) * | 2009-11-20 | 2011-05-26 | 삼성중공업 주식회사 | Polishing wheel assembly and polishing apparatus comprising the same |
| CN205166722U (en) * | 2015-11-10 | 2016-04-20 | 青岛威特动力木业机械有限公司 | Quick assembly disassembly sand light brush dish |
| US20170165811A1 (en) * | 2015-12-09 | 2017-06-15 | Kolthoff Gabrovo Eood | Tool for Fine Machining of Surfaces |
| WO2017207008A1 (en) * | 2016-05-31 | 2017-12-07 | Kadicma Aps | Tool with tool elements |
| WO2020035120A1 (en) * | 2018-08-16 | 2020-02-20 | Flex Trim A/S | Rotary machining unit |
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Also Published As
| Publication number | Publication date |
|---|---|
| DK202370101A1 (en) | 2024-09-10 |
| WO2024175161A1 (en) | 2024-08-29 |
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| Date | Code | Title | Description |
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| PAT | Application published |
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| PME | Patent granted |
Effective date: 20240910 |