EP2957387A1 - Adaptateur destiné à l'application d'une meule sur un bloc support - Google Patents

Adaptateur destiné à l'application d'une meule sur un bloc support Download PDF

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Publication number
EP2957387A1
EP2957387A1 EP14172914.5A EP14172914A EP2957387A1 EP 2957387 A1 EP2957387 A1 EP 2957387A1 EP 14172914 A EP14172914 A EP 14172914A EP 2957387 A1 EP2957387 A1 EP 2957387A1
Authority
EP
European Patent Office
Prior art keywords
adapter
recesses
pattern
side facing
support plate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP14172914.5A
Other languages
German (de)
English (en)
Inventor
Philip König
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hermes Schleifmittel GmbH and Co KG
Original Assignee
Hermes Schleifmittel GmbH and Co KG
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 Hermes Schleifmittel GmbH and Co KG filed Critical Hermes Schleifmittel GmbH and Co KG
Priority to EP14172914.5A priority Critical patent/EP2957387A1/fr
Publication of EP2957387A1 publication Critical patent/EP2957387A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D9/00—Wheels or drums supporting in exchangeable arrangement a layer of flexible abrasive material, e.g. sandpaper
    • B24D9/08—Circular back-plates for carrying flexible material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • 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

Definitions

  • abrasives are used on pad, especially round abrasive sheets on paper backing, which are preferably used with hand grinders, in particular eccentric grinding machines.
  • the machined surface should receive a particularly visually appealing appearance.
  • a workpiece is in a multi-stage process with staggered, graded from coarse to fine grains processed.
  • the high-quality surfaces obtained can, for example, be painted or polished to a high gloss.
  • the most complete possible extraction of the grinding dust formed during the grinding process is important. This is to prevent that the dust compacts and enforce individual areas of the sanding sheet. As a result, not only the service life of the abrasive sheet is shortened. In addition, surface defects may also occur in the form of scratches or marks. Regardless of the technical aspects of the application, the reduction of dust load in terms of occupational safety has a high priority.
  • a disadvantage of such patterns is the suction in only individual areas of the abrasive sheet. Thus, especially in the inner area of the dust compact and contribute to premature end of life.
  • EP 781 629 B1 discloses an abrasive sheet having a narrow perforation pattern. Thus, there are a plurality of smaller openings through which the dust is extracted at many points distributed over the surface of the abrasive sheet.
  • the abrasive sheet is mounted by means of an adapter on a support plate.
  • the adapter has a gas- and particle-permeable layer, through which the grinding dust can be sucked through and can be supplied to corresponding extraction openings in the support plate of the grinding machine.
  • the invention is based on the object to provide an adapter of the aforementioned type, which allows for easy handling in conjunction with various abrasive sheets and grinding a good grinding performance with good surface quality and long service life of the abrasive sheet.
  • the invention relates to an adapter which serves for attaching a grinding tool on a support plate.
  • the term support plate refers to the effective surface of a grinding machine on which the grinding tool is mounted. According to the invention, it may in particular be a hand-guided grinding machine which is provided for surface treatment.
  • the grinding tool is preferably a grinding tool with an abrasive on a base, for example on a paper backing, for example, a conventional abrasive sheet.
  • the abrasive sheet preferably has a plurality of apertures or holes (hole pattern), more preferably a dense hole pattern with small hole intervals, which allows the passage of sanding dust through the sanding sheet.
  • the abrasive sheet may have all commercially available hole patterns and hole spacings, since the suction is effective over substantially a substantial portion of the surface of the adapter, preferably over the entire surface.
  • the adapter of the invention provides the adhesion of the abrasive sheet on the backing pad.
  • it has repositionable connection means for connection to the support plate on one side (the side facing the support plate).
  • Repositionable means that the connection is releasable again after use.
  • the connection is sufficiently strong to be used as intended (a proper grinding) to allow.
  • the connection means may comprise, for example, a hook-and-loop connection.
  • An adhesive, in particular self-adhesive connection is also possible.
  • the adapter On the opposite side facing the grinding tool, the adapter also has suitable repositionable connecting means, which may be identical or different with the means on the opposite side. These means are used for attaching the grinding tool, in particular an abrasive sheet.
  • the passage means for the passage of grinding dust from the side facing the grinding tool to the side facing the backing plate allow grinding dust to be sucked from the suction device of the grinding machine through the adapter and corresponding openings in the backing pad of the grinding machine.
  • Characteristic of the invention is the exact design of these passage means.
  • a pattern of recesses is arranged in each case, which extend through a part of the thickness of the adapter.
  • These recesses or depressions basically allow the absorption and (in the gas stream) forwarding of grinding dust.
  • the two patterns of recesses are arranged according to the invention so that they partially overlap and form in the overlap region the adapter as a whole penetrating openings.
  • each recess of the first or second pattern reduces the thickness of the adapter by only a predetermined fraction.
  • the reductions in the thickness of the adapter together lead to a complete opening.
  • Partially overlapping means in the context of the invention that the two patterns of recesses do not coincide, so it is not a total of complete openings. Rather, the non-overlapping areas are merely reductions in the thickness of the adapter.
  • aperture refers to any opening extending through the entire thickness of the adapter.
  • the course of the main axis of such an opening is preferably approximately perpendicular to the plane of the adapter, but it may also include an angle of less than 90 ° with the plane and thus obliquely through the adapter, the angle of the main axis may, for example 80 ° or less, 60 ° or less or, for example, about 45 °.
  • the invention makes it possible to provide the surfaces of an adapter with a relatively high proportion of recesses which communicate on the side facing the abrasive sheet with openings or patterns of the abrasive sheet and thus can suck in dust.
  • the high surface portion of recesses possible according to the invention enables secure communication with the suction openings in the support plate.
  • the structure of the adapter and thus also its capacity for occurring during grinding forces and pressures is not or only slightly weakened, since the proportion of complete Openings through the structure of the adapter, which can contribute significantly to the weakening of the adapter, according to the invention significantly less than the area ratio of the recesses on each side of the adapter.
  • the adapter can thus suck dust close to its place of origin through the provided with openings or holes patterns grinding tool (abrasive sheet) and lead into the recesses on the grinding tool side facing.
  • the particles are transported by the gas stream resulting from the suction, until they reach an opening and are transported from there into the recesses on the opposite side of the adapter until they reach a suction opening in the support plate.
  • the adapter according to the invention may have on both surfaces relatively large "open" surface portions, can be sucked through the dust (on the side facing the grinding tool) or on the dust in the suction openings of the support plate can be dissipated (on the support plate side facing ). Since the two patterns of recesses on each side only partially penetrate the material of the adapter and apertures are arranged only in the overlapping surface area, the structure and thus mechanical stability of the adapter is not or only slightly weakened.
  • the grinding dust need not be passed through a fiber layer permeable to the particles, which is always at risk of being clogged by the particles. Instead, the removal of the dust can take place through completely open openings of the adapter, which have no or at most a very low risk of clogging.
  • the degree of overlap is according to the invention 5 to 50%, preferably 5 to 30%, more preferably 10 to 20%.
  • the area of the full apertures (measured in the plane perpendicular to the major axis of the respective apertures) is said percentage of the total area of the recesses of either the first pattern of recesses or the second pattern of recesses.
  • the first pattern of recesses on the side facing the grinding tool and / or the second pattern of recesses on the side facing the support plate 5 to 50%, preferably 10 to 40%, more preferably 20 to 40%, on preferably occupies 30 to 40% of the total area of the respective side of the adapter. This achieves a relatively open surface in which a sufficiently large degree of coverage is achieved with the hole pattern of an abrasive sheet on one side or the suction openings of the backing plate on the other side.
  • the area fraction of the openings penetrating the adapter as a whole on the total area of the side facing the sanding pad is 1 to 10%, preferably 2 to 5%. According to the invention, such a relatively high open surface area can be combined on the surfaces of the adapter with a comparatively small proportion the structure of weakening perforations.
  • the depth of the recesses reaches according to the invention preferably 40-60%, more preferably about 50% of the thickness of the adapter.
  • the side walls of the recesses are preferably arranged approximately perpendicular to the plane of the adapter, you may optionally run obliquely, so that the depth of the recesses increases from the edge towards the center.
  • the adapter according to the invention has two halves joined together, each of which has a pattern of apertures (through this half).
  • the two halves are joined together in such a way that the respective openings partially overlap and in the overlapping area the adapter forms penetrating openings in total.
  • the two halves can be made separately, the openings of these halves can be prepared for example in a conventional manner by stamping.
  • the pattern of the openings of both halves can be basically identical or different.
  • the two halves are joined together, for example, glued, in a manner that the respective openings partially overlap.
  • an adapter according to the invention is preferably in the range 2-10 mm, more preferably 2-5 mm. If an inventive adapter should also have elastic properties, a larger height, for example in the range 20-30 mm may be useful.
  • the recesses are preferably elongated. This means that their largest length exceeds the largest width by at least a factor of 2. They are preferably elongated straight, but may optionally also be curved. In the case of a curved recess, its length is measured along the course of the curvature. The length of each recess is preferably smaller than the radius of the usually circular adapter.
  • Elongated recesses may extend over a correspondingly long portion of the adapter and thus ensure that a large part of the openings or holes of an abrasive sheet on one side of the adapter and the suction openings in the support plate on the opposite side can each communicate with recesses of the adapter and contribute to the extraction of dust. Furthermore, an elongated design of the recesses facilitates the gas and particle flow through these recesses and thus a safe removal of the dust.
  • the preferred limitation of the length of each recess to less than the radius of the adapter causes no excessive weakening of the mechanical strength of the adapter.
  • the first pattern of recesses and the second pattern of recesses each have a plurality of elongated, substantially mutually parallel recesses.
  • These recesses are preferably rectilinear, but may optionally also be curved.
  • an arrangement substantially parallel to one another means that the respective tangents of the longitudinal axes are substantially parallel to one another.
  • the longitudinal axes of the first and second patterns of recesses are arranged at an angle to each other, which is preferably 20-90 °, more preferably 45-90 °, more preferably about 90 °.
  • each recess is preferably in the range 1-5 mm, more preferably 2-4 mm.
  • the width of the webs between the recesses is preferably 2-7 mm, more preferably 4-6 mm.
  • the edge region of the adapter has no recesses, the width of this edge region is preferably at least 2% of the diameter of the adapter.
  • Another object of the invention is an assembly of a grinding machine with a support plate, a mounted on the support plate adapter according to the invention, and attached to the adapter, preferably provided with a hole pattern abrasive sheet.
  • An inventive adapter has an intended for placement on the backing pad of a grinding machine side, which is hereinafter referred to as the bottom.
  • This underside is provided with a suede adhesive layer 1, with which it can be fixed on the backing pad of a grinder.
  • a pattern of openings 3 arranged substantially parallel to one another extends.
  • the top of the adapter has a Velcro layer 2, on which a perforated sanding sheet can be attached. Through the upper half of the adapter also extends a pattern of substantially mutually parallel apertures. 4
  • Both halves of the adapter have a perforation-free edge 5 and 6, further there are cross-shaped extending over the respective half reinforcing webs 7 and 8, which cause the result that the maximum length of each aperture is smaller than the radius of the adapter ,
  • the two halves of the adapter are made of a Vulkanfiber the Fa. Dynos, type Dynos TVF-E.
  • the adapter has a diameter of 147 mm.
  • the width of each recess is 3 mm, the width of the webs between the recesses 5 mm.
  • the two halves of the adapter are glued to each other in such a way that the longitudinal axes of the recesses are arranged rotated by 90 ° to each other. It can be seen that in this way on each side of the adapter, a pattern of elongated recesses or channels is present, can be announced by the dust or dissipated.
  • the transversely extending channels on both sides of the adapter are connected by a number of openings 9, which are respectively present where a channel of the bottom and a channel of the top cross and thus the adapter is broken in total.
  • the two comparative tests were carried out with two different sanding sheets, which were stapled directly onto the backing pad.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding-Machine Dressing And Accessory Apparatuses (AREA)
EP14172914.5A 2014-06-18 2014-06-18 Adaptateur destiné à l'application d'une meule sur un bloc support Withdrawn EP2957387A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP14172914.5A EP2957387A1 (fr) 2014-06-18 2014-06-18 Adaptateur destiné à l'application d'une meule sur un bloc support

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP14172914.5A EP2957387A1 (fr) 2014-06-18 2014-06-18 Adaptateur destiné à l'application d'une meule sur un bloc support

Publications (1)

Publication Number Publication Date
EP2957387A1 true EP2957387A1 (fr) 2015-12-23

Family

ID=50972543

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14172914.5A Withdrawn EP2957387A1 (fr) 2014-06-18 2014-06-18 Adaptateur destiné à l'application d'une meule sur un bloc support

Country Status (1)

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EP (1) EP2957387A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0781629B1 (fr) 1995-12-29 1999-06-09 Peter Jöst Elément abrasif adaptable directement ou indirectement à une machine ou à un support d'abrasif actionné manuellement ainsi qu'un adaptateur approprié
US20070243803A1 (en) * 2006-04-14 2007-10-18 3M Innovative Properties Company Abrasive tool for collecting dust
WO2009088772A2 (fr) * 2007-12-31 2009-07-16 Saint-Gobain Abrasives, Inc. Tampon d'interface destiné à être utilisé entre un article abrasif et un outil de support

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0781629B1 (fr) 1995-12-29 1999-06-09 Peter Jöst Elément abrasif adaptable directement ou indirectement à une machine ou à un support d'abrasif actionné manuellement ainsi qu'un adaptateur approprié
US20070243803A1 (en) * 2006-04-14 2007-10-18 3M Innovative Properties Company Abrasive tool for collecting dust
WO2009088772A2 (fr) * 2007-12-31 2009-07-16 Saint-Gobain Abrasives, Inc. Tampon d'interface destiné à être utilisé entre un article abrasif et un outil de support

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