Classifications

• • 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
  • B24D7/08—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 with reinforcing means
• • 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
  • B24B7/00—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor
  • B24B7/10—Single-purpose machines or devices
  • B24B7/18—Single-purpose machines or devices for grinding floorings, walls, ceilings or the like
  • B24B7/186—Single-purpose machines or devices for grinding floorings, walls, ceilings or the like with disc-type 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
  • 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
• • 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

Definitions

• the present invention refers to a tool for the roughing and/or polishing of hard surfaces such as stone, marble or the like.
• the tool subject-matter of the present invention is of the type usable in association with hand-operated machines, such as an angle grinder or the like, for manual treatment of surfaces by an operator.
• Flexibility of the disc-like bearing is an essential requisite, as it allows a bending of the abrasive disc, under the operator's pressure, so as to best adapt to the surface and therefore obtain a result that be the best possible.
• the known discs have a reduced flexibility in the sense indicated herein. This is basically due to the fact that the abrasive members placed on the work surface are made in the form of metal strips on which the abrasive is deposited via a galvanic- type deposition process. Such metal strips are then anchored onto the elastic bearing, at the work surface, to cover most of it.
• the metal strips though flexible, greatly stiffen the support itself, relevantly limiting its possibility of bending in use. In particular, bending is limited depending on the arrangement and orientation of the metal strips, moreover making tool behavior non- homogeneous. This constitutes an evident limit of the known art.
• object of the present invention is to solve the problems still left open by the known art, and this is attained by a tool as defined in claim 1.
• the present invention by overcoming the problems of the known art, entails several evident advantages.
• the tool described herein entails no risk of detachment of abrasive members in use.
• the manufacturing and the anchoring modes thereof to the bearing is such as to guarantee very high performances and the maximum possible safety for the operator.
• FIG. 1 is a perspective view of a tool according to the present invention.
• FIG. 2 is a sectional view of a tool according to a first embodiment of the present invention.
• Figure 2A is a view of a detail of Figure 2;
• FIG. 3 is a sectional view of a tool according to a second embodiment of the present invention.
• Figure 3A is a view of a detail of Figure 3;
• FIG. 4 is an illustrative view of the use mode of a tool according to the present invention.
• Figures 5A, 5B and 5C are views of a tool according to a third embodiment of the present invention.
• FIG. 6A, 6B and 6C are views of a tool according to a fourth embodiment of the present invention.
• FIGS. 7A, 7B, 7C and 7D are views of a tool according to a fifth embodiment of the present invention.
• figure 1 it shows a surface machining tool 1.
• the tool 1 is of the type usable with a rotary machine, e.g. a grinder, a drill and the like.
• the tool 1 comprises an elastic bearing 2 of rubber.
• the rubber of which said elastic bearing 2 is made is of thermoplastic type, in particular thermoplastic polyurethane which allows to obtain the desired flexibility and elasticity of the bearing, combining it with the right mechanical strength.
• thermoplastic type in particular thermoplastic polyurethane which allows to obtain the desired flexibility and elasticity of the bearing, combining it with the right mechanical strength.
• other materials may be used, in particular rubbers, thermoplastic and non-thermoplastic ones, provided they exhibit equivalent technical and physical features.
• Such bearing 2 preferably has a discoidal shape and comprises means for fastening to a mandrel of the rotary machine.
• such means can comprise a metal flange 10, equipped with connections and/or holes suitable for said fastening function. It is not deemed necessary to delve into the details of such means, as it could be different depending on the type of machine for which the tool is intended.
• the bearing 2 has a surface 3, which herein will be referred to as work surface 3.
• the work surface 3 is the tool portion which, during a machining, contacts the material to be polished.
• the tool should be provided with abrasive material, at its work surface 3.
• the elasticity and flexibility of the material of which the bearing 2 is comprised of is advantageous for allowing optimum adaptation of the bearing itself to the surface to be polished during the machining.
• the tool 1 comprises a plurality of rigid abrasive members 4, anchored to the elastic bearing 2.
• Each of said abrasive members 4 has a projecting portion 5 which projects from the work surface 3.
• each projecting portion 5 of each abrasive member 4 may have a surface of an extension comprised between 15 and 80 mm 2 .
• the bearing can bend, elastically, about each single point represented by one of the abrasive members 4.
• each one of the projecting portions 5 of the abrasive members 4 is button-, dome- or disc-shaped.
• the abrasive members 4 comprise means for anchoring to the elastic bearing 2.
• FIGS. 2 and 3 are sectional views illustrating two embodiments of the present invention, in connection with the anchoring modes of the abrasive members 4 to the bearing 2.
• Such anchoring means may be of different type, but anyhow such as to guarantee a firm anchoring to the bearing itself and, above all, a reduction of the stress and strains to which the members 4 themselves are subjected in machining.
• the anchoring means comprises a body 6, integral to the projecting portion 5, having a substantially frustoconical or frustopyramidal shape.
• the body may advantageously be housed in corresponding seats obtained directly on the elastic bearing 2.
• a production process for a tool of this kind may envisage a step of moulding the elastic bearing. Therefore, at the mould-preparing stage the abrasive members 4 may be prearranged in position; their frustopyramidal or frustoconical bodies will remain embedded in the bearing itself, as illustrated in Figure 3A.
• the side walls of the body 6 may be knurled to improve the seal; in addition, side bosses may be provided which further hold the abrasive member 4 integral to the bearing 2.
• the anchoring means may be made so as to comprise a rod 7, integral to the projecting portion 5, and apt to be inserted into a corresponding through hole obtained in the elastic bearing 2.
• a corresponding fastening element 8 is then provided, so that it may cooperate with the rod at the surface 9 opposite to the work surface 3.
• the rod 7 may be a threaded rod, and the fastening element 8 a corresponding nut 10.
• This embodiment is illustrated in Figure 2A.
• each individual abrasive member is subjected merely to a minimum stress, especially a shearing stress, and held firmly anchored to the elastic bearing 2.
• the abrasive members 4 As to the manufacturing of the abrasive members 4, they comprise abrasive material on the surface of the projecting portion 5.
• the abrasive material will be set on the members 4 according to modes depending on the type of material of which the members themselves are made, and on the technologies selected and/or available.
• the abrasive material used for treating hard surfaces is diamond.
• the abrasive members could be made of metal or metal alloy, with a subsequent depositing of diamond grain on the projecting portion.
• the depositing could be carried out with galvanic methods or by means of vacuum-brazing, or by sintering.
• the abrasive members 4 may be entirely or at least partly made of resin (or mixture of resins).
• the abrasive material e.g. the diamond grain, might be directly mixed to the resin, to form at least the projecting portion.
• the technique for manufacturing the abrasive members will be selected depending on the intended use of the tool. In fact, different manufacturings are suited for different machinings. Some are more suited to roughing jobs, others are more suited to polishing jobs.
• the elastic bearing has a substantially discoidal shape and, at rest, a convexity facing the work surface.
• the abrasive members 4 could therefore be arranged so as to define lines and a pattern taking into account the bearing rotation.
• curved lines, preferably spiral- shaped ones can be provided, wound about the center of rotation of the tool.
• each of the abrasive members 4 may be mounted idle on a bearing element, so as to be able to freely rotate with respect to the elastic bearing 2. This advantageously produces a lengthening of the life of the abrasive members, since they, by revolving on themselves, best exploit all of their surface extension.
• FIGs 5A, 5B and 5C are views of a tool according to a third embodiment of the present invention.
• the tool provides a plurality of peripheral abrasive members 14, arranged along an external periphery of the bearing 2.
• peripheral abrasive members 14 are provided, arranged at the ends of two orthogonal diameters of the disc 2, therefore at 90° the one to the other.
• peripheral abrasive members 14 have the purpose of allowing a correct machining also of angle parts, as illustrated in Figure 5C.
• each of the peripheral abrasive members 14 should necessarily be arranged so as to come as close as possible to the external peripheral edge of the bearing 2, or, even better, so as to project with respect to said periphery.
• each of the peripheral abrasive members 14 covers also a corresponding side portion of the bearing 2.
• peripheral abrasive members 14 be present in a number greater than four along the periphery of the bearing disc 2, so as to limit or eliminate gaps during rotation, in contact with the surface to be machined.
• a fourth embodiment of the tool according to the present invention is provided.
• the peripheral abrasive members 14 are arranged, along the periphery of the bearing 2, at a mutual distance shorter than their size.
• peripheral abrasive members 14 are preferably arranged so as to project with respect to said periphery and cover also a corresponding side portion of the bearing 2.
• Figures 7A, 7B and 7C refer to a fifth embodiment of a tool according to the present invention.
• the tool comprises substantially disc-shaped peripheral abrasive members 14 .
• the abrasive members 4 are discshaped and manufactured according to the same technique.
• all abrasive members are manufactured by inserting rivet-type devices into the bearing 2.
• each of said abrasive members is disc-shaped and can be mounted idle on a bearing member, so as to be able to freely rotate with respect to the elastic bearing 2.
• This advantageously produces a lengthening of the life of the abrasive members, since they, by revolving on themselves, best exploit all of their surface extension.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Polishing Bodies And Polishing Tools (AREA)
• Cutting Tools, Boring Holders, And Turrets (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=44553987

Family Applications (1)

Country Status (4)

Families Citing this family (4)

Family Cites Families (10)

• 2011
  • 2011-04-06 IT IT000173A patent/ITRM20110173A1/it unknown
• 2012
  • 2012-04-04 US US14/009,791 patent/US20140045414A1/en not_active Abandoned
  • 2012-04-04 EP EP12722514.2A patent/EP2694248A1/de not_active Withdrawn
  • 2012-04-04 WO PCT/IB2012/051652 patent/WO2012137143A1/en active Application Filing

Non-Patent Citations (1)

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