Technical field

The present invention relates to a slab edge polishing and/or milling system, as well as to an edge polishing and/or milling method for a slab made of material capable of being machined such as stone agglomerates, ceramics, natural stones and the like. The system supports a tool for polishing and/or milling the edges of slabs that can be made of different materials, particularly hard materials. The invention refers too to machined slabs obtained through the methods as well as panels made up of joined polished and/or milled edges of slabs.

The invention is applicable in the field of portable hand tools for polishing or milling the edges of slabs, preferably of stone agglomerates, natural stone, ceramics, and the like, that preferably find use in the fabrication and installation of kitchen countertops.

Background of the invention

In the state of the art, different portable manual machines are known for polishing and/or milling the edges of natural stone slabs or stone agglomerates, used at the place of installation of the slab in order to adapt it to the necessary dimensions and shapes determined by the required application, the dimensions and spaces at the place of installation of the slab, usually bathrooms and kitchens, for flooring, wall cladding and most frequently countertops. It is customary to cut the slab in situ since the actual required measurements often differ from those on plan. Therefore the slab needs to be cut and trimmed by the installers just prior to installation. The edges obtained by cutting the slabs, which would be visible during the intended use of the slab, are generally polished and/or milled to improve their appearance.

In most cases, it is also necessary to join together different pieces of slabs, for example when the required length or width of the countertop exceeds the dimensions of the starting slab, or when the countertop is designed with no-straight shapes. In those cases, the starting slabs are cut in pieces, and the cut edges which are used for making those joints are polished and/or milled before they are joined together with intermediation of an adhesive. The length of these joints might range up to more than 1 m, but more normally they are between 40 - 80 cm long, and their visual appearance for the quality of the installation work is of upmost importance.

Examples of said polishing and/or milling machines are described for example in US-7373936-B1 and US-8162726-B1. Both documents describe tools placed on a guiding body and displaced manually for polishing or milling at least one edge of a slab. These guiding bodies of the machines are directly placed on the slab that is to be polished or milled, which is at the same time placed on a flat surface (floor, a table, a structure, etc.). Afterwards, the guiding body and the slab have to be positioned and aligned in order to guarantee that the edge is parallel to the movement of the polishing or milling head and afterwards secured with clamps.

After thorough investigations, the inventors realized that although these devices might provide acceptable results when the polished or milled edges are those to remain visible in the intended use of the slab, they fail importantly when the machined edges are to be used for forming joints between slab pieces.

As the known devices are placed manually by an operator it is difficult to assure that the guide will always be perfectly aligned and that the tool will move with the required parallelism to the edge of the slab and perpendicularity to the surface of the slab all through the polishing/milling process. The positioning and adjusting of the slab is subject to operator mistakes. In addition to the above, the guiding body is directly fixed to the slab and the retention means used, mainly the clamps, do not guarantee that the different components cannot move relative to each other when the tool is moved, considering too that the polishing/milling step is inevitably accompanied by severe vibrations when the head of the tool acts on the edge of these normally hard materials. As a consequence, even highly skilled operators have difficulties to obtain reproducible results regarding the parallelism, planarity and perpendicularity of the machined edges of different slab pieces.

Even small deviations in the machined edges of different slab pieces in their parallelism, or in the perpendicularity between the major surfaces of the slab and the slab edge, results in grooves, separations or openings in the joints between the machined edges of two slab pieces or boards. The imperfections in the joints can be seen with the naked eye, and further to an aesthetic disadvantage, dirt and microorganisms can also accumulate in them, meaning a potential risk for the use as kitchen worktop.

The cited prior art documents US-7373936-B1 and US-8162726-B1 are silent regarding to the above problematic.

From the above, it is apparent that there is a need for an improved portable manual polishing and/or milling tool, and an improved method for polishing and/or milling slab edges, which allows the operator to move the tool along the edges of the slabs under very repeatable conditions of linearity and perpendicularity to the upper and lower major faces of the slab, conditions which can be precisely reproduced in the different edges to be joined together, minimizing the occurrence of deviations. As already mentioned, the tools used in the state of the art do not allow linearity in the polishing and/or milling path to be achieved and reproduced with sufficient level of reproducibility, and therefore, they do not allow the edges of the parts to be joined to be perfectly parallel and perpendicular to the major slab surfaces.

The invention achieves an improvement in the machined slab edges and as a result, also in the creation of joints from those edges, by the combination of at least the following:

- Reproducible positioning and reliable fixation of the polishing and/or milling tool with respect to the slab,

Uniform movement of translation of said tool along the slab parallel to the edge being polished and/or milled,

Constant and adjustable pressure of the tool head on the slab during the machining operation of the slab edge,

Assurance of the planarity and perpendicularity of the polished and/or milled edges relative to the major slab surfaces,

Improved reproducibility of the resulting polished and/or milled edges of different slab pieces or boards.

In order to achieve these objectives resulting in improved joints of slab pieces or board, which are nearly visually imperceptible and which cannot accumulate dirt or microorganisms, the present invention provides an improved slab edge polishing and / or milling system, as well as a method among other objects. Description of the invention

In accordance with a first object of the invention, this invention proposes a slab edge polishing and/or milling system, which is preferably portable, according to claim 1. Additional features of the invention are contained in claims 2 to 7.

Specifically, the system, object of the invention, comprises: - A guiding body,

- A tool carriage with a polishing and/or milling tool connection and with guiding means enabling the displacement of said carriage along the guiding body,

- A slab supporting frame, preferably a supporting frame table,

Positioning means and fixing means for relative fixation of the guiding body on said frame, and

Locking means for securing the position of the slab between the guiding body and the frame.

The system is portable, meaning that it can be transported and used in the site where the installation of the slab or panel takes place, and it is not a fixed construction. Preferably, the system can be transported by the operator itself or with the help of another person.

The system allows the blocking of a slab in the correct position, between the supporting frame and the guiding body, wherein the slab is made of materials that are capable of being machined, such as stone agglomerates, natural stones, ceramics and the like. The slab comprises two major surfaces, normally the top and bottom surfaces, one front edge (the one intended to be machined), one rear edge (opposed to the front edge), and two lateral edges. In the intended uses of the slab, normally the top surface will be the surface that remains visible in the application or final location of the slab (for example, the top surface of a kitchen countertop).

The system assures through the positioning and fixing means that the relative position of the guiding body and the tool carriage with respect to the frame, and through the locking means that the relative position of the edge of the slab to be machined with respect to the movement of the head of the polishing and/or milling tool does not change during the machining process, despite the vibrations generated by the tool and despite the refrigerating/lubricating means normally used in this process. The system assures too that the possibility of alignment deviations or operator errors are minimized, and therefore that the edge can be precisely duplicated in another slab.

In order to make possible using slabs of different thicknesses, the positioning means of the system are preferably vertical devices to allow the vertical displacement of the guiding body with respect to the supporting frame along a vertical axis (z). Also preferably, the fixing means are stops that prevent the movement of the guiding body with respect to the supporting frame in any of three orthogonal axes (x, y, z). The locking means of the system are placed to block the position of the slab, and therefore also the edge slab, between the supporting frame and the guiding body, once the slab has been correctly positioned. Preferably, the system includes adjusting means for the correct positioning of the slab edge to be machined relative to the machining head as well as relative to the guiding body and supporting frame. The combination of adjusting means and locking means in the system assure the parallelism, planarity, linearity and perpendicularity between the edge of the slab and the different surfaces of the system and the repeatability of the results, blocking the right position of the slab in the system before and during the polishing and/or milling. Said locking means preferably block the slab in three orthogonal axes (x, y, z) to secure its position. Specifically, said locking means are preferably:

First locking means along the longitudinal axis (x): these are preferably side carriages on the lateral ends of the guiding body that displace stop devices that are placed between the frame and the guiding body, pushing against the lateral edges, perpendicular or nearly perpendicular to the edge of the slab to be polished and/ or milled (front edge), and

Second locking means along the vertical axis (z): these are preferably means that act on the side carriages placed on the lateral ends of the guiding body and exert a pressure on the major surface of the slab, that is to be placed in contact with the supporting frame.

By the effect of the combination of the locking means along the longitudinal axis (x) and the vertical axis (z), it is also achieved a locking in the remaining transversal axis (y) direction.

The position of the slab between the frame and the guiding body can be adjusted manually by using a measuring meter, a gauge, references, or a ruler. However, this might be subject to operator mistakes. In preferred embodiments, the system includes adjusting means for correct and repeatable positioning of the slab to therefore achieve correct positioning, improved repeatability and to minimize the risk of operator mistakes. The adjusting means preferably comprise limiting devices, spacers or extended elements with two ends, that act as limiters of the position of the slab along the transversal axis (y), suitably placed on the front part of the guiding body or of the frame. These adjusting means define the distance between the edge of the slab to polish and / or mill and the guiding body, guaranteeing the parallelism between the edge of the slab and the movement of the head of the machining tool. The guiding body might comprise any number of displacement guides. However, the guiding body preferably comprises at least two displacement guides, which may be parallel between them, and suitably also parallel to the front part of the guiding body. In preferred embodiments, the guiding body comprises two parallel displacement guides which are designed to be positioned during the machining process, also substantially parallel to the edge being polished and/or milled during the machining step. The displacement guides serve the guiding means of the tool carriage to displace along said guiding body.

The tool carriage comprises too guiding means intended to be located on said at least one displacement guide on the guiding body, coupled to this at least one displacement guide, allowing only a linear translational movement along said guides longitudinally parallel to the edge to be machined and preventing the carriage from moving in any other direction. Said carriage further comprises a tool connection for coupling the polishing and/or milling tool and it will travel along and parallel to the edge of the slab, machining the same, when the guiding means and the tool carriage move along the at least one displacement guide driven manually by the user. Thus, the displacement of the tool carriage along said guides and therefore the displacement of the tool along the edge of the slab are achieved. The guides may have adjustable limit switches in order to prevent the support from slipping out of the guides or for limiting the extend of the edge to be machined, preferably a limit switch on each end of at least one of the guides.

Said guiding means are preferably at least two friction guide shoes, for example, made of Teflon, roller guide shoes with ball bearings or the like, which would be in contact with the at least one displacement guide. Preferably, the displacement guides are located inside said guiding means, the means and the guides having complementary shapes in order to ensure tight connection between both. For example, the sections of the guides and the guiding means may be rounded or curved, or dovetailed, such that they enable the displacement of the means over the guides, without risking "derailing" of the former or the slipping out of the latter.

The tool connection on the tool carriage, in suitable embodiments, comprises regulating means for modifying the position or distance of the head of the polishing and / or milling tool, allowing the tool to get closer or farther from the supporting frame and therefore from the front edge of the slab, or to regulate the pressure that the head exerts on the edge during the polishing and/or milling process. In preferred embodiments of the system, the carriage also comprises inclination means to modify the inclination of the head of the machining tool with respect to said edge. Therefore, by these inclination means it is possible to assure that the angle between the head of the tool with respect to the surface of the supporting frame where the slab is placed, and therefore with respect to the major surfaces of the slab, is always 90° ± 5°, preferable 90° ± 2°, and that the machined edge is always perfectly perpendicular to those major (top and bottom) surfaces.

In view of the above, in order to polish and/or mill the edge of the slab, the guiding body is placed on top of one of the major faces or surfaces of the slab, normally the top major surface of the slab, with the at least one displacement guide, preferably two guides, projecting up from the guiding body. The other major face or surface of the slab is placed facing the supporting frame. The guiding body is suitably positioned and secured to the supporting frame through the positioning means and the fixing means comprised in the system.

A second object of the invention is, according to claim 8, a method for polishing and/or milling a slab edge, which may use the slab edge polishing and/or milling system of the first aspect of the invention.

The steps of said method are, in view of the described system:

a) Placing a guiding body on a supporting frame through positioning means, b) Placing the slab with the edge to be polished and / or milled between the guiding body and the supporting frame,

c) Blocking the position of the guiding body on the frame by fixing means, d) Securing the position of the slab between the guiding body and the frame by locking means,

e) Confronting the head of a polishing and / or milling tool with the edge of the slab, the tool being connected to a tool carriage displaceable along the guiding body, f) Polishing and / or milling the edge of the slab after activation and displacement of the head of the tool along the edge of the slab, when the carriage is moved along the guiding body.

The steps of this method do not need be performed in the sequence given, and any meaningful sequence is also possible without departing from the scope of the invention. Thus, for instance, it is thinkable that the step d) is done before or simultaneously with step c), or step c) might be done simultaneously or before step b), or step b) might be done simultaneously or before step a). In preferred embodiments of the method, it additionally comprises a step b1 ) of arranging, on the guiding body and/or on the supporting frame, the adjusting means for the position of the slab. In further preferred embodiments, the method comprises additionally a step d 1 ), which may be done after step d), of removing the adjusting means for the position of the slab from the guiding body and/or the supporting frame.

Step c) is preferably performed so that the guiding body on the frame is blocked in any spatial direction.

Step d) is preferably performed so that the position of the slab is locked in any spatial direction.

In further preferred embodiments, the method includes a step e1 ) of adjusting the angle of the head of the polishing and/or milling tool relative to the top major surface of the slab, preferably to an angle of 90° ± 5°, more preferably to an angle of 90° ± 2°.

Advantageously, the polishing and/or milling step f) is conducted by displacing the head several times along the edge. Preferably, particle abrasives are used with a decreasing particle size sequence, more preferably with a grit size sequence of 50- 100-200, and optionally finishing with grit size 400.

With the afore-mentioned method and system, the edges of the slabs obtained have improved parallelism, planarity and perpendicularity to the major surfaces of the slab. The repeatability of the results is also improved, with reduced risk of the occurrence of operator mistakes. These improved polished and/or milled edges allow joining two slab pieces to obtain panels where the joint between the slab pieces is significantly improved regarding its visual appearance. The improvement is such, that the joint is nearly imperceptible.

The appearance of the joints between two slab pieces can be further improved by an improved method of joining two slab pieces, which is an additional aspect of the invention. Said method comprises polishing and/or milling the edges to be joined of the slab pieces in accordance with the invention. Then, it is followed by a step of grinding the machined edge for creating a recess on the lower part of the edge (the part of the edge distal from the top surface of the slab, the visible surface during use of the slab) for placing an adhesive for gluing the slab pieces. With this new step the slab piece comprises a recess where adhesive can be introduced to further be fixed or glued to other slab piece, wherein the adhesive is not visible in the joint from the top major surface of the panel obtained. Since the adhesive is only present in the lower recesses of the joint edges, the upper part of the edges can still come into intimate contact with each other.

Another object of the invention also relates to the slabs or slab pieces with improved machined edges, obtained by the method for polishing and/or milling slab edges according to the embodiments herein.

The invention also comprises a method for the formation of joints between slab pieces made of materials capable of being machined such as stone agglomerates, ceramics, natural stone and the like, which uses the method for polishing and/or milling slab edges according to the embodiments herein. Said method, object of the present invention, is a method for obtaining a panel made up of at least two slab pieces, wherein:

the slab pieces are obtained through a method of the embodiments herein with polished and/or milled edges having a recess,

placing an adhesive in the recess of the edge of at least one of the pieces, - joining both pieces together and applying pressure, and

removing the excess of adhesive.

By the above method a panel formed by two slab pieces is obtained, wherein the joint shows an improved appearance and wherein the risk of accumulation of dirt and microorganisms in the joint is significantly reduced.

The invention also concerns the panel formed by joining at least two slab pieces, wherein their machined edged to be joined are obtained in accordance with the method for polishing and/or milling slab edges of the embodiments herein. Preferably, the panels of the invention are also obtained by applying method for obtaining a panel made up of at least two slab pieces of the embodiments herein.

Along this description, relative position terms are used, such as top, bottom, horizontal, vertical, upper, lower, etc. Unless it is otherwise specified, those terms are intended to describe the position relative to the common understanding and relative to the position of the ground. Brief description of the drawings

The foregoing and other advantages and characteristics of the invention will be more fully understood in light of the following detailed description of the embodiments, with reference to the attached figures, which must be considered by way of illustration and not limitation, wherein: Figure 1 shows a perspective view of a system according to the invention, with the guiding body positioned on but not fixed to the supporting frame.

Figure 2 shows a side view of the system.

Figure 3 shows the AA cross-sectional view of Figure 2.

Figure 4 shows a plan view of the system.

Figure 5 shows a perspective view of the guiding body of the system.

Figure 6 shows a plan view of the guiding body.

Figure 7 shows a perspective view of the locking means of the system.

Figure 8 shows a side view of the tool carriage with guiding means of the system.

Figure 9 shows a perspective view of the tool carriage.

Figure 10 shows a perspective view of part of the tool carriage, specifically the tool connection.

Figure 1 1 shows a perspective view of an inverted supporting frame of the system.

Figure 12 shows a side view of the supporting frame.

Figure 13 shows a top perspective view of the system with a slab positioned and locked between the frame and the guiding body, with the adjusting means for the position of the slab in place.

Figure 14 shows a rear perspective view of the system with a slab positioned and locked between the supporting frame and the guiding body , with the adjusting means for the position of the slab in place.

Figure 15 shows a perspective view of the system with the tool connection pivoting to confront the head of the tool with the edge of the slab.

Figure 16 shows a perspective lateral of the head of the tool confronting the edge of the slab.

Figure 17 shows a perspective view of the system with the tool head confronting and acting on the edge.

Figure 18 shows a perspective view of a slab piece with a polished and/or milled edge having a recess for receiving adhesive.

Figure 19 shows a top perspective view of two slab pieces being joined together through their previously machined edges.

Figure 20 shows schematically a cross-section of the panel made up of two slab pieces showing the improved joint between them, result of joining their machined edges with the adhesive inside the recessed parts of the edges.

Detailed description of the preferred embodiments

Referring to the enclosed figures, the preferred embodiments of the present invention will be now described. As previously mentioned, the edge 2 polishing and/or milling system 10 for a slab 1 made of materials capable of being machined such as stone agglomerates, ceramics, natural stone and the like, comprises a guiding body 200, a tool carriage 300 with a polishing and/or milling tool connection 310 and with guiding means 330 enabling the displacement of said carriage 300 along the guiding body 200, a slab supporting frame 100, positioning means 120, 240, and fixing means 241 for relative fixation of the guiding body 200 on said frame 100, and locking means 233, 234, 235 for securing the position of the slab 1 between the guiding body 200 and the frame 100. In the preferred embodiments shown in the figures, the polishing and/or milling system 10 is a portable system and incorporates several handles 106 for its transportation by the user.

To couple the different components of the system 10 in order to polish and/or mill the edge 2 of a slab 1 , in a preferred way of carrying out the invention, the supporting frame 100, preferably a frame table, and more preferably a frame table with a T shaped body 105, is placed on a surface, for example the floor or more preferably other elevated surface, standing on at least four legs 110, preferably seven legs, with height regulating means that are acted independently for leveling the supporting frame 100 on the surface. Once the frame 100 is leveled horizontally, the guiding body 200 with the tool carriage 300 is positioned on top of the supporting frame 100 with help of the positioning means 120, 240, for example represented by vertical devices such as rods 120 arranged on the frame 100, introduced in receiving means 240 placed for that purpose on the guiding body 200, for example, rings 240 in the guiding body 200 adapted to receive the rods 120. Other types of positioning means are thinkable without departing from the scope of the invention.

Once the guiding body 200 is placed on the supporting frame 100, in preferred embodiments, two limiting devices 220 acting as adjusting means along the transversal axis (y) of the system 10 are coupled to the front part or side 225 of the guiding body 200 (as shown in figures 1-4) or the front part or side of the supporting frame 100 (as shown in figures 13-14). The front part or side 225 of the guiding body 200 or the frame 100 refers to the part or side more proximal to the intended position of the front edge 2 to be machined of the slab 1. These limiting devices 220 preferably have an“L” shape to define the appropriate distance between the short leg of the“L” shaped device 220 and the front part or side 225 of the guiding body 200 or the front part of the frame 100. Once the limiting devices 220 have been coupled, the slab 1 is placed between the guiding body 200 and the supporting frame 100, e.g. by elevating the guiding body 200 and introducing the slab 1 between both components 100, 200. Once the slab 1 is between the guiding body 200 and the supporting frame 100, it is positioned with the front edge 2 to be machined contacting the short leg of the“L” shaped limiting device 220.

In the particular embodiments shown in the figures, so that edges of different lengths can be machined, and the system can adapt to slabs of different sizes, additional means for supporting the slab 1 may be placed on the frame 100, specifically on the short side of the T-shaped body 105. Said supporting means comprise an L piece 130 with a slot and can move perpendicular to said short side depending of the size of the slab. To reach the position of the slab 1 placed on the T-shaped body 105 the L piece 130 comprises adjustable means 131 that displace with respect to the L piece 130 until they contact with the lower major surface 4 of the slab 1.

Afterwards the relative position of the guiding body 200 and the supporting frame 100 is locked through the fixing means 241 , a screw pushing the rod 120 of the positioning means inside the ring 240, so that in this stage the guiding body 200 and the guiding means 330 on the tool carriage 300 will not be able to move anymore with respect to the supporting frame 100.

Afterwards, the locking means of the system 10, preferably first and second locking means, are activated to secure/block the position of the slab 1 within the system 10, between the guiding body 200 and the supporting frame 100. Specifically, in the preferred embodiments shown in the figures, the first locking means move along the longitudinal axis (x), that is the axis parallel to the front edge 2 of the slab 1 to be machined, and perpendicular to the lateral edges 3 of the slab 1 , and are activated by moving two lateral wheels 230 that displace side carriages 231 along the guiding body 200. These side carriages 231 are displaced until they contact the lateral edges 3 of the slab 1 , which are normally approximately perpendicular to the front edge 2 of the slab 1 to be machined or front edge 2 of the slab 1. Once they have contacted said lateral edges 3, these first locking means of the system 10 are secured or blocked with locks or brakes 237 and further fixing means 234, preventing the movement of the slab 1 in the longitudinal (x) direction. Said carriages 231 preferably comprise also second locking means 233, 235 that work along the vertical axis (z), that is the axis perpendicular to the major surfaces 4 of the slab 1 , of the system 10, and act vertically on the lateral carriages 231 to prevent the movement of the slab 1 in the vertical axis (z) with respect to the whole system.

Said side carriages 231 comprise a side wheel 230 connected to the carriage 231 through rods 236, being one of said rods 236 an endless screw that allows the movement of the carriage along the rods 236. Said carriage 231 comprises a vertical plate 232 that moves under the surface 205 of the guiding body 200 that comprises the second locking means 233, 235 and means 234 for precise adjustment of the locking in the longitudinal (x) axis. The second locking means are preferably composed by a vertical screw 235 that vertically displaces a horizontal plate 233 that pushes upwards the slab 1 through its lower major surface. The precise longitudinal adjustment means 234 push the slab 1 through its lateral edges 3.

Now the slab 1 is reliably secured/blocked between the guiding body 200 and the supporting frame 100, and simultaneously the guiding body 200 is fixed to the supporting frame 100. As a result, the components of the system 10 and the slab 1 are blocked against any movement relative to each other, even in the occurrence of strong vibrations or the operator inadvertently pushing the slab 1.

Before proceeding with the polishing and/or milling step, the front edge 2 of the slab 1 will be exposed by removing the limiting devices 220.

At this point, the head 341 of the polishing and/or milling tool 342 on the tool carriage 300 can be positioned facing the edge 2 to be machined and this head 341 can be displaced parallel to the front edge 2 of the slab 1 , by moving the carriage 300 along the two parallel displacement guides 210 placed on the surface 205 of the guiding body 200.

The displacement guides 210 are preferably covered by a suitable protection 250 such as an accordion cover that is folded when the guiding means 330 of the carriage 300 displace along the displacement guides 210 on the guiding body 200 pushing said accordion cover 250. Further, the side carriages 231 on the guiding body 200 are also preferably protected by cases 235. These protections 250, 235 help to prevent the introduction of refrigerating/lubricating liquids and/or particles arising from the polishing/milling of slab.

The movement of the guiding means 330 placed on the tool carriage 300, and therefore the movement of the tool carriage 300, along the displacement guides 210 of the guiding body 200 can be carried out manually through the force that an operator or user exerts on the carriage 300 or on the guiding means 330, by driving or pushing the same on the guides 210. Advantageously, it is foreseen that the tool carriage 300, or the tool connection 310 comprised in it, comprises a gripping element 312, such as a grip, clamp, handle or the like, which facilitates gripping or holding the tool carriage 300 by the operator and subsequent manual driving.

The manual polishing and/or milling tool 342 couples to the tool carriage 300 through retention means 340 on the tool connection 310. The tool carriage 300 and the tool 342 are configured so that it is enabled that the machining head 341 of the tool 342 can be arranged either in a resting position (far from the front edge 2 of the slab 1 ) or in a working position (near and facing the front edge 2 of the slab 1 ). In order to facilitate positioning of the tool head 341 from the resting position to the working position, said tool carriage 300 comprises means of articulation 322 for pivoting the connection 310, and hence the tool 342, from the resting position to the working position. A security device that prevents undesired articulation of the connection 310 and that locks the tool in the working position can be also included and may comprise a grip 323 with a rod connected with a chain 324, where the rod, with or without a screw, crosses the body of the tool connection 310 and the body 320 of the tool carriage 300 preventing the movement of the tool connection 310 with respect to the tool carriage 300. Further the body 320 of the tool carriage 300 has stops 321 to receive the tool connection 310 when this pivots to its resting position on to the carriage 300.

The tool connection 310 of the carriage 300 shall allow easy coupling and uncoupling of different polishing and/or milling hand tools 342 through the retention means 340 on the connection 310. The tool carriage 300 might also comprise displaceable coupling means 31 1 of the tool, preferably in the tool connection 310 itself, so as to be able to regulate the distance between the machining head 341 of the polishing and/or milling tool 342 and the slab edge 2 to be machined, and therefore also regulate the pressure that the tool head 341 exerts against the edge 2 of the slab 1 during polishing and/or milling. These displaceable means 31 1 for the tool 342 comprise an endless screw that when it is actuated displaces the tool 342 with respect to a plate 316 on the tool connection 310. Once the definitive position of the tool 342 is reached said position is fixed by activating side locks or brakes 313, 315 on the tool connection 310 that prevent the movement of the endless screw of the displaceable means 31 1 for the tool 342. The retention means 340 for the tool 342 must preferably allow the coupling of different manual polishing and/or milling hand machines, without being limited by the manufacturer and the type of tool, for which it may be necessary to use an adapter between the connection and the tool.

Since it is a portable system that must allow being transferred to the place where it is needed for use, usually the installation site of the slab in a bathroom or a kitchen, and since people, preferably without the help of additional machinery, carry out said transfer, the system must be, just like the tool, transportable by a user, i.e., portable. To this end, the system comprises fastenings or grips 106 at the ends, preferably of the supporting frame 100 and in the guiding body 200, that enable the transfer thereof by means of one or two people, depending on the dimensions of the supporting frame 100. The weight and dimensions of the frame 100 and the components thereof may vary depending on the dimensions of the slabs 1 to be machined and the materials of the different components of the support, which will preferably be duralumin for the frame 100, guiding body 200 and tool carriage 300.

As previously mentioned, and as it is shown in figures 15 to 17, once the slab 1 is locked between the frame 100 and the guiding body 200, the tool connection 310 with the tool 342 is confronted with the edge 2 of the slab 1 to be machined.

In preferred embodiments, the tool carriage 300 comprises inclination means 317 for adjusting the inclination of the tool head 341 relative to the plane of the top major surface of the slab 1. In the embodiments shown in the figures, the inclination means are realized by two screws 317 located in threads provided in the body 320 of the carriage 300, so that when the tool connection 310 is pivoted to the working position, the tool connection 310 rests onto the heads of these two screws 317. By screwing in or screwing out the screws 317 from the threads in the body 320 of the carriage 300, the resting position of the tool connection 310 is slightly raised or lowered, and so, the inclination angle of the tool head 341 relative to the top major surface of the slab 1 might be adjusted to an angle of 90° with very small deviation of ±5° or even ±2°. The screws 317 are provided with blocking means, a nut in the figures, to block further rotational movement of the screw once the inclination angle has been set.

Once it is assured that the tool head 341 is perpendicular to the top major surface of the slab 1 , the machine is switched on and the front edge 2 is polished and / or milled by moving the tool carriage 300 along the displacement guides 210 of the guiding body 200.

Therefore, summarizing, the main steps of the method for polishing and / or milling an edge of a slab or slab piece, according to the preferred embodiments shown in the figures, are:

- Placing a guiding body 200 on a supporting frame 100 through positioning means 120, 240.

Placing the slab 1 with the edge 2 to be polished and / or milled between the guiding body 200 and the supporting frame 100, with help of the adjusting means 220.

- Blocking the position of the guiding body 200 on the frame 100 by fixing means 241.

Locking the position of the slab 1 between the guiding body 200 and the frame 100 by locking means.

Removing the adjusting means 220.

- Confronting the head 341 of a polishing and / or milling tool 342 with the edge 2 of the slab 1 , the tool 342 being connected to a tool carriage 300 displaceable along the guiding body 200.

Polishing and / or milling the edge 2 of the slab 1 after activation and displacement of the head 341 of the tool 342 along the edge 2 of the slab 1 , when the carriage 300 is moved manually along the guiding body 200.

After polishing and / or milling the edge 2 of the slab 1 , it is possible to use the same system 10 to, once the edge 2 has been polished and/or milled, grind said edge 2 to create a recess 5 in a portion of that edge 2, by simply changing the head 341 of the tool 342 to a grinding head. The system may be provided with limiters of the displacement of the tool carriage (300) to limit the length of the recess 5. Said recess 5 may be used to place adhesive inside it for joining two slab pieces 1 , 1 ^' . The panel obtained by joining the two slab pieces 1 , 1 ^' , with confronted edges polished and/or milled with the previously described system 10 and method, using adhesive in the recesses 5, 5 ^' , allows obtaining improved joints of slab pieces, which are nearly visually imperceptible and with minimized risk of accumulating dirt or microorganisms. The joining of both slab pieces 1 is made by applying pressure between both confronted edges provided with adhesive through known means. For example devices 500 are coupled to the two slab pieces 1 , 1 ^' to be joined, by creating vacuum between the devices 500 and the surface of the slab pieces 1 , 1 ^' , wherein the devices 500 are joined through rods so that they can be pneumatically approximated. Once the two slab pieces 1 , 1 ^' are joined, the excess of adhesive that might exit from the joint due to the pressure exerted is removed.