TOOL FOR MACHINING STONE OR CONCRETE FLOORS
The invention relates to a machine and at least one tool (10) for machining floor and road surfaces. The tool comprises at least one rotatably mounted disc (20) driven during use, which disc (20) comprises at least one machining element (30) being attached at one end (30a) to the disc. The machining element has a free end (30b) with a symmetrically blunt shape, so that the disc can be driven in different directions with the same machining element in a plane essentially in parallel with the plane of the disc.
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The present invention relates to a tool for machining stone or concrete floors, comprising at least one rotatably mounted disc driven during use, which disc carries at least one machining element.
DESCRIPTION OF RELATED ARTToday, tools for machining stone or concrete floors, i.e. primarily grinding and polishing but also cutting, milling or crushing floor surfaces and/or cleaning these surfaces by removing coatings on them with the object of producing plane, clean and/or smooth floor surfaces commonly use a machining appliance which carries one or more rotatably mounted discs that in turn carries one or more machining elements. This machining element or cutter/bit contacts the floor surface while performing a movement in a plane in parallel to the rotating disc, so that a machining of the floor surface is produced.
An exemplary tool for such machining of floor surfaces is disclosed in SE-C2-525 802.
A disadvantage of known tools for machining of floor surfaces is that one and the same tool can not be used for carrier discs rotating in different directions when driven, whereby left hand and right hand versions of the tools have to be manufactured. These left hand and right hand tool versions also have a disadvantage in that a left hand tool may not be mounted instead of a right hand tool or vice versa, whereby the risk of mistakes when mounting the tools increases. Moreover, another disadvantage is that prior art tools commonly only have one machining element and one supporting stud that restricts the cutting depth and which stud does not have any machining function, whereby the removal rate of these tools are relatively low. Furthermore, still another disadvantage is that prior art machining tools have a low resistance against shocks/strikes.
SUMMARYAn object of the invention is therefore to provide an improved machining tool, which eliminates or at least reduces the disadvantages for prior art machining tools.
The invention is defined by the enclosed independent claim. Embodiments are set forth by the dependent claims attached and by the following description and the drawings.
According to the invention a tool for machining floor and road surfaces, comprises at least one rotatably mounted disc driven during use, which disc comprises at least one machining element being attached at one end to the disc. The machining element has a free end with a symmetrically blunt shape, so that the disc can be driven in different directions with the same machining element in a plane essentially in parallel with the plane of the disc.
In one embodiment of the invention, the machining element protrudes out of the disc with its longitudinal axis perpendicular to the plane of the disc.
In another embodiment of the invention, the machining element protrudes out of the disc with its longitudinal axis oblique in relation to the plane of the disc.
In yet another embodiment the disc which comprises at least one machining element protruding out of the disc with its longitudinal axis perpendicular to the plane of the disc and at least one machining element protruding out of the disc with its longitudinal axis inclined in relation to the plane of the disc.
In still another embodiment the machining element protrudes out of the disc with its longitudinal axis having an inclination angle of up to 45° in relation to an axis being perpendicular to the plane of the disc.
In other embodiments, the free end of the machining element has a rounded shape, a spherical shape, is chamfered, or has a frustoconical shape.
Moreover, in another embodiment, the tool comprises a supporting stud with a support surface in parallel with the plane of the disc for contacting the floor surface, whereby the supporting stud in yet another embodiment is a machining element in that its support surface comprises machining abrasives. Furthermore, in another embodiment, the tool comprises a cutting element, which, in still another embodiment, has a back-rake angle of between 5°-20°.
In one embodiment, the free end of the machining element is made of poly crystalline or poly compact diamond (PCD), or is made of mono crystalline diamond (MCD) in another embodiment.
The invention also concerns a machine for machining floor and road surfaces, comprising at least one tool with at least one rotating disc, which disc comprises at least one machining element in accordance with any of the embodiments defined above.
Providing the machining element in a tool for machining floors and road surfaces with a free machining end having a symmetrically blunt shape, i.e. with no sharp edge/-s in any direction, means that the machining element machines the floor and/or road surface similar to a mill or a crusher, and that the machining of the floor/road surface is performed independently of the direction of rotation of the tool. Furthermore, a blunt shape is less sensible for strikes against projections, irregularities, edges etc in the floor/road surface. This strike/shock resistance of the tool is further enhanced by making the tool end in poly crystalline or poly compact diamond. Moreover, if such an inventive machining element is combined with cutting elements on the same tool, the inventive machining element enhances the engagement for the cutting element in the floor/road surface by milling/scratching the floor/road surface “opening” it up for the cutting edge on the cutting element, which increases the removal rate.
The tool will now be described in more detail with reference to the schematic drawings enclosed, in which
Each carrier plate 21, as shown in
In a preferred embodiment of the machining disc 20 (shown in
The machining element 30 shown in
The tool 10 for machining floor and road surfaces comprises the at least one rotatably mounted disc 20 driven during use, which disc carries the at least one machining element 30 being attached at one end 30a to the disc or the plate 21. The machining element 30 has a free end 30b with a symmetrically blunt shape, i.e. it has no sharp cutting edges in any direction, so that the disc 20 can be driven in different directions with the same machining element. This is possible due to the fact that the symmetrically blunt shape does not hinder the movement of the disc 20 to different extents in different directions, instead it gives an essentially equal resistance/friction in all directions of movement when the element 30 is in engagement with the surface, i.e. independently of linear and/or rotational direction of the disc 20. The directions could as mentioned be opposite rotational directions for the disc 20, e.g. clockwise and anti-clockwise, or linear movements of the disc 20 in different directions, e.g. back and forth, or combinations of these movements in varying patterns depending on the desired machining of the floor/road surface.
In one embodiment, the machining element 30 protrudes out of the disc 20 or the plate 21 with its longitudinal axis perpendicular to the plane of the plate (
One embodiment of the tool 10 comprises the at least one machining element 30 protruding out of the disc 20 or the plate 21 with its longitudinal axis perpendicular to the plane of the disc/plate and at least one machining element 30 protruding out of the disc or plate with its longitudinal axis inclined in relation to the plane of the disc/plate, as shown in
According to another embodiment, the free end 30b of the machining element 30 has a rounded shape, i.e. an all round shape, as shown in
According to another embodiment, the tool 10 comprises a supporting stud 40 with a support surface 41 in parallel with the plane of the disc 20 or the plate 21 for contacting the surface, so that any surface is machined as plane as possible. This further reduces the risk of jamming the free end 30b of the machining element 30 in the surface during machining because it controls the depth of the engagement for the machining element with the surface, i.e. the milling/crushing effect of the machining element 30 is controlled.
In one embodiment, the supporting stud 40 also is a machining element in that its support surface 41 comprises machining abrasives, which may be of any known type, e.g. a diamond matrix. This improves the removal rate when machining the surface and enhances the control of the engagement depth for the machining element 30 with the surface, and also makes the surface of the floor/road smoother reducing the risk of jamming the free end 30b into a too coarse surface.
According to yet another embodiment, the supporting stud 40 has a underheight in relation to the free end 30b of the machining element 30. This further enhances the control of the engagement depth for the machining element with the surface, and further reduces the risk of jamming or machining the free end 30b too deep into the surface. In another embodiment, the tool 10 comprises a cutting element 50. This increases the removal rate for the tool when combined with the inventive machining element 30 when machining the surface due to the fact that at least two machining elements, i.e. the machining element 30 and the cutting element 50, cooperate in that the machining element 30 “opens up” the surface for the cutting element 50. The third machining element 50 has a back-rake angle of between 5°-20°, preferably 15° as shown in
In
The size of the machining element 30 and its orientation together with its free length protruding out of the disc 20 or plate 21 may be chosen differently for different applications. The machining element is for example between 2 to 20 mm in diameter and protrudes out of the disc 20 or the plate 21 with a length of at least 3 mm when used for machining and cleaning stone and/or concrete floors while it may have a larger diameter and may protrude out with a different length when used for machining roads, wherein a diameter of more than 20 mm and a free protruding length of more than 3 mm are suitable.
Moreover, the machining element 30 may protrude out of the disc 20 or the plate 21 with its longitudinal axis having an inclination angle α of up to 45° in relation to the axis V being perpendicular to the plane of the disc/plate, i.e. the machining element 30 may extend in any direction out of the disc/plate in relation to the vertical axis V as long as the longitudinal axis is inclined not more than 45° from the vertical axis V. This means that the inclination of the longitudinal axis of the machining element is limited by a cone with a cone angle of 45° if the longitudinal axis of the machining element is swept 360° around the vertical axis V as seen in a plane being perpendicular to the vertical axis, i.e. a swept plane in parallel with the plane of the disc 20 or the plate 21, with the limiting inclination of 45°.
Claims
1. A tool for machining floor and road surfaces, comprising:
- at least one rotatably mounted disc driven during use,
- which disc comprises at least one machining element being fixedly attached or attachable at one end to the disc,
- wherein the machining element has a free end with a symmetrically blunt shape, designed to machine the floor and/or road surface in a milling or crushing-like manner, so that the disc can be driven in different directions with the same machining element in a plane essentially in parallel with the plane of the disc, and
- wherein the free end of the machining element is made of poly crystalline or poly compact diamond (PCD) and/or of mono crystalline diamond (MCD).
2. A tool according to claim 1, wherein the machining element protrudes out of the disc with its longitudinal axis perpendicular to the plane of the disc.
3. A tool according to claim 1, wherein the machining element protrudes out of the disc with its longitudinal axis oblique in relation to the plane of the disc.
4. A tool according to claim 1, wherein the disc comprises at least one machining element protruding out of the disc with its longitudinal axis perpendicular to the plane of the disc and at least one machining element protruding out of the disc with its longitudinal axis inclined in relation to the plane of the disc.
5. A tool according to claim 3, wherein the machining element protrudes out of the disc with its longitudinal axis having an inclination angle (α) of up to 45° in relation to an axis (V) being perpendicular to the plane of the disc.
6. A tool according to claim 1, wherein the free end of the machining element has a rounded shape.
7. A tool according to claim 1, wherein the free end of the machining element has a spherical shape.
8. A tool according to claim 1, wherein the free end of the machining element is chamfered.
9. A tool according to claim 1, wherein the free end of the machining element has a frustoconical shape.
10. A tool according to claim 1, comprising a supporting stud with a support surface in parallel with the plane of the disc for contacting the floor surface.
11. A tool according to claim 10, wherein the supporting stud is a machining element in that its support surface comprises machining abrasives.
12. A tool according to claim 1, comprising a cutting element.
13. A tool according to claim 12, wherein the cutting element has a back-rake angle of between 5°-20°.
14. A machine for machining floor and road surfaces, comprising at least one tool with at least one rotating disc, wherein the disc comprises at least one machining element in accordance with claim 1.
15. A method for removing a surface layer on a floor or road surface, comprising milling or crushing the surface with a tool as claimed in claim 1.
Type: Application
Filed: Feb 7, 2008
Publication Date: Jun 3, 2010
Applicant: HTC Sweden AB (Soderkoping)
Inventors: Kåre Kilgren (Svartsjo), Håkan Thysell (Soderkoping)
Application Number: 12/523,833
International Classification: B24B 7/22 (20060101); B24B 7/18 (20060101); B24D 5/06 (20060101); E01C 23/088 (20060101); B24B 1/00 (20060101);