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
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B28—WORKING CEMENT, CLAY, OR STONE
  • B28D—WORKING STONE OR STONE-LIKE MATERIALS
  • B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
  • B28D1/18—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by milling, e.g. channelling by means of milling tools
  • B28D1/181—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by milling, e.g. channelling by means of milling tools using cutters loosely mounted on a turning tool support

Definitions

• the present invention is related to a rotating tool for roughing surfaces such as for removing rust on steel plates, working of welds before applying more welding material, abrading concrete surfaces, removal of paint and other preparations before applying paint etc.
• various methods are known: blasting, working with a pick axe and a scaling hammer for removal of slag, abrading by hand or by means of rotating, flexible or rigid grinding disks, wire brushing by hand or by means of rotating, motor driven brushes.
• a rotating wire brush is previously known, which has relatively thick wires of steel mounted radially on a hub in one or more axial rows.
• the wires are, as well, bent to form a loop between their fastening point and the inner end of the wire, which is arranged freely at the hub.
• the d sadvantages of this type of tool are first of all (1) the limited resistance against wear which delimits the use of this tool to working of surfaces with a relatively soft surface layer, and (2) rupture of the spring wire used, which has the result in the fact that a part of a steel wire may be thrown away with great force and seriously damage the operator or persons present in the neighbourhood of the tool.
• a rotating tool is previously known consisting of radially arranged, relatively soft steel wires, which at their outer end carry spherical abrasive bodies consisting of or coated with an abrasive material. This tool is intended for a very smooth finishing treatment of the inner surface of cylindrical bodies, in particular for honing of cyl nders in combustion motors.
• the purpose of the present invention is to eliminate or at least significantly reduce said disadvantages mentioned in relation to a rotating paint remover. Briefly this purpose is accomplished by providing loops in the steel wire in the shape of closed coils between the fastening points of the wires in the hub and those ends of the steel wires, which are in contact with the working surface, and by providing wear portions of a wear resistant hard material on these ends. Further, the part of the wires adjacent to the hub may be provided with an elastic annular body through which the wires pass. In this way a tool is provided for roughing with a widely extended range of use.
• Figure 1 shows a rotating tool according to the invention, seen in an axial direction
• Figure 2 shows, seen from the side, a number of tools assembled to a larger unit
• Figure 3 shows an example of an embodiment of a wear portion
• Figure 4 shows an alter-. native embodiment of the invention seen from the side
• Figures 5 and 6 show examplary ways of how to attach a wear portion.
• the reference numeral 1 designates the hub portion of the tool, which is provided with a centre hole 3.
• the hub portion 1 consists of two circular plates, which are attached to each other by mea,ns of six rivets 5, arranged symmetrically in the circumferential direction. Between the circular plates there is, if necessary, a circular washer 7 of a smaller diametre. Between the plates 1 are clamped springy steel wires 9 bent to the shape of a V which approximately at the centre of the leg of the V are bent to annular loops 11. Every spring wire 9 can be provided with several loops 11 and ⁇ ry loop can consist of several turns. The arrangement of the loops are, in addition adapted to the loads for which the spring wires are intended.
• the loops 11 are necessary to give the spring wires the elastic property, needed for the wires to stand great stresses.
• the V- shaped steel wires 9 are attached at the point of the V since the hub plates in this area 13 have been pressed together to be practically applied to each other.
• the spring wires can be fastened by their passing behind the rivets 5 at the point of the V.
• the steel wires as an example, can be made of 1 mm music wire, but material and dimensions are otherwise chosen with regard to the expected loads.
• wear portions 15 At the outer end of the steel wires 9 there are attached, by means of hard soldering or in another suitable way, wear portions 15. These can consist of or be coated with hard material as conventional abrasive material. According to the invention, however, they consist of hard metal.
• the wear portions 15 in Figures 1 and 2 are shown with a cylindrical shape. Another preferred shape is illustrated in Figure 3.
• the wear portion 15 here has the shape of a cut-off pear and its thicker part is intended to be arranged at the larger distance from the axis of the tool.
• the thicker part can be provided with pointed small protrusions 17 and the whole portion 15 has a through hole 19 for mounting on a steel wire.
• FIGs 1 and 2 there is also illustrated how to prevent, according to the invention, that the wires 9 are broken adjacent to their attachment point in the hub portion 1.
• the radially inner parts of the wires are embedded in a vulcanized rubber body 19.
• This rubber body 19 can have a suitable radial extension, for instance up to the region of the wires located between the hub 1 and the loops 11.
• the elastic body 19 cooperates with the wires, so that the bending of every individual spring 9 is carried by the other spring wires.
• this gives every wire spring a greater stiffness and as well a localized indication of fracture is avoided which otherwise would exist adjacent to the entrance point of the wire 9 into the hub portion 1, i.e. at the border of the hub 1.
• an extra security is obtained against the risk that the spring is thrown away, as the spring 9 in this case also is held by the elastic body 19.
• Figure 2 shows how the individual rotating elements in Figure 1 can be assembled to one unit.
• a centre bolt 21 with a nut washer 23 and nut 25 holds the elements together. If necessary, spacer washers 27 can be provided between the elements. In this way a rotating tool of arbitrary width can be obtained.
• FIG 4 is shown an alternative embodiment of the invention.
• the corresponding parts have been given the same reference numerals as above.
• the embodiment differs from the one described above by the fact that the spring wires 9 are bent in order to provide a tool for working axially contrary to the embodiment above which is intended for working radially.
• the bending is made with a deviation of approximately 90° between the inner parts of the strings 9, which are adjacent to the hub 1, and the outer parts located adjacent to the wear portions 15. Further the bending is made so that the inner parts of the springs-are arranged radially in the same way as above and the outer parts are located more or less axially contrary to the embodiment above, in which all of the spring wires 9 are located principally in radial directions.
• the region of the bending of the wires 9 can be located inside the elastic body 19 to enhance the resistance of the spring wires against being extended radially due to the centrifugal forces.
• the bending can also be located in the region of the spring wires where these leave the rubber body 19.
• a rotating tool is obtained suited also for comfortable use in for example angle grinding machines in analogy with conventional so-called cup-shaped wire brushes.
• several tool elements can be assembled in a suitable way to one unit with multiple rows of spring wires and wear portions.
• FIGS 5 and 6 Examples of how a wear portion can be attached to the spring wire 9 are shown in Figures 5 and 6 as alternatives to the direct hard soldering of the wire into a hole in the wear portion.
• the wear portion is cylindrical, has essentially the same outer diametre as the wire 9 and is attached to the wire by means of an intermediate sleeve or muff portion 29, which in turn is hard soldered both to the wire and the wear portion.
• a connection sleeve 29 and in this case the sleeve is provided with different inner diametres at its both ends.
• the tubular sleeve 29 can be exchanged by a short helical spring. This may be prolonged as is shown in Figure 6.
• both end portions of the helical spring 31 are soldered to the spring wire 9 and to the wear portion 15 respectively, so that the helical spring has a free intermediate part.
• the wire and the wear portion can have different diametres which is preferred according to the invention.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Mining & Mineral Resources (AREA)
• Springs (AREA)
• Polishing Bodies And Polishing Tools (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=20360710

Family Applications (1)

Country Status (2)

Cited By (3)

Citations (4)

• 1985
  • 1985-06-26 SE SE8503171A patent/SE8503171L/sv unknown
• 1986
  • 1986-06-25 WO PCT/SE1986/000307 patent/WO1987000107A1/en unknown

Patent Citations (4)

Also Published As

Similar Documents

Legal Events