EP2992998A1 - Rotary disc with removable abrasive segments - Google Patents

Abstract

The invention relates to a disc (1) for a rotary tool (2) for working a solid material by removal of material, comprising a substantially circular plate (8) having removable segments (9) on its underside (10). ) intended to be in contact with the solid material to be worked. According to the invention, each detachable segment (9) is held on the underside (10) of the tray (8) by means of recessed locking shapes (14) provided on a top face (18) of each removable segment. (9), and projecting locking shapes (15) provided on the bottom face (10) of the plate (8), the locking shapes (14, 15) each comprising sidewalls (16, 17) converging substantially towards the center of the plate (8) for locking the segments (9) by the centrifugal force exerted on the removable segments (9) when the disc (1) is rotated.

Description

Technical area

The present invention relates to the field of rotary tools provided for working a solid material by removal of material by means of a disk having segments.

The invention more particularly relates to the attachment of the segments on the rotating disk, these segments generally comprising diamond material removal inserts.

State of the art

In the aforementioned field, discs having an abrasive outer face are known for which the segments are formed in one piece with the discs. When the segments are worn, the discs are then discarded and replaced, which is prohibitively expensive.

It is therefore known to fix the segments removably on the discs so as to replace the segments when they are worn and thus be able to keep the discs. This solution is advantageous in that it also makes it possible to use different segments, depending on the material to be worked and the desired rendering, without having to change discs.

The segments are usually fixed on the disks by screwing, but because of the many screws to remove and then put back in place, the replacement of such segments is a long and tedious operation.

Disclosure of the invention

The object of the present invention is therefore to overcome the disadvantages of the prior art by providing a new means of securing the segments on the discs that is simple, fast and safe.

The objects assigned to the invention are achieved by means of a disk for a rotary tool for working a solid material by removal of material, comprising a substantially circular plate having removable segments on its underside intended to be in contact. with the solid material to work.

According to the invention, each removable segment is held on the underside of the tray by means of recessed locking shapes provided on a top face of each removable segment, and projecting locking shapes provided on the underside of the tray. plateau, the blocking forms each comprising flanks converging substantially towards the center of the plate to secure the segments by the centrifugal force exerted on the removable segments when the disc is rotated.

Thus, when using the rotary tool, the removable segments are retained between the solid material to be worked and the underside of the plate, while being held in position by the hollow locking forms. The segments can be easily changed, without having to use a wrench or the like, since the segments are held by centrifugal force only, without using screws or other attached fasteners.

According to an exemplary implementation of the invention, the hollow and / or protruding blocking shapes are of complementary shape so as to be able to fit each other. Restrained solely by the mutual engagement of the locking forms and by the centrifugal force when the disc is rotated, the removable segments can thus be easily and quickly placed on the disc and removed therefrom. Advantageously, the establishment and removal of the removable segments are done by hand, without requiring any tools or any physical effort.

According to an alternative embodiment of the invention, the hollow and / or protruding blocking shapes are of triangular or trapezoidal shape.

According to an exemplary implementation of the invention, the recessed locking form has an open side on its outer edge, which makes it easier to remove the segments placed on the disk.

According to another exemplary implementation of the invention, the convergent sides of the hollow and / or protruding blocking forms are rectilinear. This also makes it easier to remove the removable segments.

According to an alternative embodiment of the invention, the removable segments comprise a ferrous material in their composition, and they are held in place on the underside of the plate by magnets provided on said plate. This variant advantageously makes it possible to keep the removable segments in place on the disk, especially when the latter is raised.

According to an alternative embodiment of the invention, the removable segments are provided on the outer periphery of the plate, and on its outer periphery, the plate has cutouts located at each of the removable segments. These cuts make it easier to manually remove the segments.

The objects assigned to the invention are also achieved with the aid of a rotary tool for working a solid material by removal of material, comprising a disk as described above.

Brief description of the drawings

• la figure 1 est une vue de profil d'une ponceuse de sol comportant un disque rotatif à segments abrasifs prévu pour travailler un matériau solide par enlèvement de matière ;
• la figure 2 est une vue d'ensemble en perspective de dessous d'un disque selon l'invention comportant six segments abrasifs ;
• la figure 3 est une vue d'ensemble en perspective de dessous d'un disque selon l'invention, sur lequel les aimants de fixation et les segments abrasifs ne sont pas représentés ;
• la figure 4 est une vue de détail en perspective de dessous illustrant la mise en place d'un segment abrasif et des aimants de fixation associés sur un disque selon l'invention ;
• la figure 5 est une vue en perspective de dessus d'un segment abrasif selon l'invention ;

Other characteristics and advantages of the present invention will emerge more clearly on reading the description which follows, made with reference to the appended drawings, given by way of non-limiting examples, in which:

• the figure 1 is a profile view of a floor sander having an abrasive segment rotary disc for working solid material by removal of material;
• the figure 2 is an overall perspective view from below of a disk according to the invention comprising six abrasive segments;
• the figure 3 is an overall perspective view from below of a disk according to the invention, on which the fixing magnets and the abrasive segments are not represented;
• the figure 4 is a detailed perspective view from below illustrating the establishment of an abrasive segment and associated fixing magnets on a disk according to the invention;
• the figure 5 is a perspective view from above of an abrasive segment according to the invention;

Mode (s) of realization of the invention

The structurally and functionally identical elements present in several separate figures are assigned a same numerical or alphanumeric reference.

The disk (1) according to the invention is intended to be used with a rotating tool (2) for working a solid material by removal of material, such as for example a floor sander (3) as shown in the drawing. figure 1 .

Such a disc (1) is usually rotated by a motor (4) to which it is connected by a central axis (5). Its upper face is generally protected by a housing (6) which also serves as a suction chamber for the material removed during operation of the rotary tool (2), while its lower face (10) is in contact with the material solid to work, for example the ground (7).

As shown on the figure 2 , the disc (1) according to the invention is in the form of a substantially circular plate (8) having removable segments (9) on its underside (10) intended to be in contact with the solid material to be worked .

The plate (8) also has through holes (11) provided in particular for its attachment to the rotary tool (2) and the suction of the removed material. Usually, it also has a central orifice (11 ') for mounting it on the central axis (5) of the rotary tool (2).

On their underside (12) intended to be in contact with the material solid to work, each removable segment (9) comprises an abrasive coating or at least one insert (13) of removal of material. For example, a material removal insert (13) may have a diamond outer surface or a ceramic element. Each material removal insert (13) is in one piece or securely fastened to the bottom face (12) of the removable segment (9).

In the figures, by way of example only, are represented removable segments (9) having two parallel inserts (13) of parallelepiped shape. The number, shape and arrangement of the inserts (13) can be arbitrary and of little importance for the invention.

Similarly, the figures show a disk (1) comprising six removable segments (9) distributed in a circular manner around the periphery of the plate (8). The number, shape and arrangement of the removable segments (9) can be arbitrary and of little importance for the invention.

According to the invention, each detachable segment (9) has at least one hollow locking shape (14) cooperating with protruding blocking shapes (15), which presents the bottom face (10) of the plate (8). , said shapes (14, 15) each having two convergent sides (16, 17) for locking the segments (9) on the plate (8) by the centrifugal force exerted on said segments (9) when the disk (1) is rotated.

According to the invention, and as shown by Figures 3 to 5 , the recessed locking shape (14) is provided on the top face (18) of each removable segment (9) while the protruding blocking shape (15) is provided on the bottom face (10) of the tray (8).

According to this embodiment, the convergent flanks (17) of the protruding blocking shape (15) of the plate (8) converge substantially towards the center of the plate (8), and the convergent flanks (16) of the locking form recessed (14) of each of the removable segments (9), when placed on the plate (8), substantially converge towards the center of said plate (8).

According to the invention, the hollow and projecting locking shapes (14, 15) are of complementary shape so as to be able to fit one another, preferably in a tight fit.

In the figures, the hollow and projecting blocking shapes (14, 15) are of triangular shape, but they may have any shape having at least two convergent sides (16, 17), for example a trapezoidal shape.

Similarly, in the figures, the hollow locking form (14) has an open side on its outer edge, namely on its edge opposite the center of the plate (8). This side open facilitates the placement and removal of the removable segments (9) on the plate (8), but is not mandatory.

The specific shape of the hollow and protruding blocking shapes (14, 15) makes it possible to hold each removable segment (9) on the plate (8) when the disk (1) according to the invention is used. When the disc (1) is rotating, the centrifugal force which tends to move each removable segment (9) away from the center of rotation of the disc (1) blocks each removable segment (9) by the thrust of the convergent sidewalls (17) of the protruding blocking shape (15) against the convergent sidewalls (16) of the recessed locking form (14). Thus, when the disk (1) is rotating, each removable segment (9) is held in place on the plate (8) in a horizontal plane by the hollow and protruding locking shapes (14, 15).

In use, each removable segment (9) is also held in place on the plate (8) in a vertical plane by the support of its underside (12) on the ground (7) or the material to be worked, and by the support of its top face (18) on the plate (8). Thus, when the disk (1) is rotating, each removable segment (9) is sandwiched between the plate (8) and the ground (7) or the material to be worked.

Note that in use, each removable segment (9) is held in place on the plate (8), but when the disk (1) is no longer rotated and is raised from the ground (7) or the solid material to work, the removable segments (9) can be easily and quickly removed for their replacement or the establishment of removable segments (9) of another type.

In the figures, the convergent flanks (16, 17) of the recessed and protruding blocking shapes (14, 15) are rectilinearly shown. The rectilinear nature of the convergent flanks (16, 17) is advantageous in that it facilitates the setting up and removal of the removable segment (9) on the plate (8), but it is also possible to envisage convergent flanks (16, 17) curved or angular.

It will be noted that the hollow and protruding blocking shapes (14, 15) are preferably designed so that, when the removable segments (9) are put in place on the plate (8), at least part of the removable segments (9) ) is offset radially with respect to the other removable segments (9) so that all removable segments (9) of the same disk (1) do not remove material at the same location, for a larger work surface for the rotary tool (2).

According to a variant of the invention, the removable segments (9), which usually comprise a ferrous material in their composition, are also held in place on the plate (8) by magnets (19) provided flush in the plate (8), that is to say so as to have an outer surface substantially at the same level as the underside (10) of the tray (8).

For this purpose, the plate (8) has hollow housings (20) provided in the bottom face (10) of the plate (8) for each housing a magnet (19).

One can also consider the use of a plate (8) magnetized.

As an example shown in the figures, the plate (8) comprises three magnets (19) provided for each removable segment (9). Those skilled in the art may, however, consider a different number, size and shape for each of the magnets without departing from the scope of the invention.

Although this is not economically advantageous, it could also provide a plate (8) comprising a ferrous material, and removable segments (9) magnetized or having magnets (19).

These magnets (19) make it easier to place the removable segments (9) on the plate (8) and hold them in position when the disk (1) is lifted from the ground and is not driven by rotation.

The same hold could be achieved for the removable segments (9) in the case where the recessed and protruding locking shapes (14, 15) fit together in a snug fit, but such a tight fit does not allow for a shrinkage as well. easy removable segments (9) than when using the magnets (19).

The removable segments (9) are preferably provided on the outer periphery of the plate (8), which allows to have a larger working surface for the disk (1) according to the invention. In this case, the plate (8) may have cutouts (21), for example in the form of rounded notches, located on its outer periphery at each of the removable segments (9), which allows a better grip of the segments removable (9). According to this preferred embodiment of the invention, to remove a removable segment (9) of a plate (8), simply slide a finger into the associated notch and lift the removable segment (9) away from the tray (8).

It is obvious that the present description is not limited to the examples explicitly described, but also includes other embodiments and / or implementation. Thus, a described technical feature can be replaced by an equivalent technical characteristic without departing from the scope of the present invention.

Claims (8)

Disc (1) for a rotating tool (2) for working a solid material by removal of material, comprising a substantially circular plate (8) having removable segments (9) on its underside (10) intended to be contact with the solid material to be worked, characterized in that each removable segment (9) is held on the bottom face (10) of the plate (8) by means of hollow locking shapes (14) provided on a top face (18) of each removable segment (9), and protruding blocking shapes (15) provided on the bottom face (10) of the plate (8), the blocking shapes (14, 15) each comprising sidewalls ( 16, 17) converging substantially towards the center of the plate (8) to secure the segments (9) by the centrifugal force exerted on the removable segments (9) when the disc (1) is rotated. Disk (1) according to claim 1, characterized in that the hollow and protruding locking shapes (14, 15) are of complementary shape so as to be mutually interlocking. Disk (1) according to any one of the preceding claims, characterized in that the hollow and protruding locking shapes (14, 15) are of triangular or trapezoidal shape. Disk (1) according to any one of the preceding claims, characterized in that the hollow locking form (14) has an open side on its outer edge. Disk (1) according to any one of the preceding claims, characterized in that the convergent flanks (16, 17) of the hollow and protruding blocking shapes (14, 15) are rectilinear. Disc (1) according to any one of the preceding claims, characterized in that the removable segments (9) comprise a ferrous material in their composition, and in that they are held in place on the underside (10) plate (8) by magnets (19) provided on said plate (8). Disk (1) according to any one of the preceding claims, characterized in that the removable segments (9) are provided on the outer periphery of the plate (8), and in that , on its outer periphery, the plate (8) has cutouts (21) located at each of the removable segments (9). Rotating tool (2) for working a solid material by removal of material, characterized in that it comprises a disc (1) according to any one of the preceding claims.

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