SI25527A2 - Magnetic spirit level with prismatic base - Google Patents

Abstract

The magnetic vortex (1) with a prismatic base, wherein the vial includes an air bubble and a vial comprising a hollow body (2) with an inner cavity (10) of a non-magnetic material, wherein the body (2) of the vestibule comprises three consecutive rectangular sides (3, 4, 5) and a side or base (6) of a spatula having at least two adjacent oblique parts (7, 8) which converge in the direction of the inner cavity (10) of said body (2) of the libel restrained by the sides (3, 4, 5 , 6), where the oblique parts (7, 8) start directly from the side surface (3,5) of the sphere, which lies adjacent to the base, or begin in short sections (11, 12) which are placed perpendicular to the side faces (3, 5) vials. The inclined portions (7, 8), rectangular successive sides (3, 4, 5) and the intermediate portions (11, 12) each have their inner surface (7A, 8A, 3A, 4A, 5A, 11A, 12A) directed towards the cavity (10), and the surfaces (7B, 8B, 3B, 4B, 5B, 11B, 12B) are directed away from the cavity (10, the libel (1) being based on its base (6) on the body surface, the slope of which on the inner surfaces (7A, 8B) of the oblique parts (7, 8) of the base (6) of the vortex are magnetic means (20, 21) that persist in the position through direct or indirect interference with the contrast non-magnetic body (10, 25, 40, 50) which is present or inserted longitudinally into the inner cavity (10) of the vestibule (1), wherein the base (6) is free of openings connecting the inner cavity (10) of the vestibule (1) with the exterior .

Description

MAGNETIC LIBELLA WITH A PRIZMIC BASE DESCRIPTION

The object of the present invention is a magnetic libel with a prismatic basis in accordance with the introductory part of the main claim.

As is well known, the vial with a prismatic base comprises a body with a multipoint cross-section having three consecutive sides perpendicular to one another, and a fourth side, the base of the libel comprising at least two oblique parts converging in the direction of the cavity located inside the body (limited by said sides).

The inclined works can begin immediately from the site that is adjacent to the base of the vortex or begin after two short sections derived from the libel which are perpendicular to the (adjacent) side faces of the vial and end where the oblique parts start.

In this kind of libel, the problem arises as to combine the inclined surfaces of the base of the prismatic layer to the iron body, the inclination we want to measure. It should be noted that in the case of a flatbed, a flat solution is a known solution with magnets acting on the (flat) basis of the libel. In this way, the vertical or inclined flat surfaces are received.

However, in the case of a libel with a prismatic basis or with a base having two V-shaped pages, there is currently no market solution on the market that would ensure the magnetic attraction of the inclined surfaces over a large part of its length, without overturning these surfaces in order to insert magnets, and without the mentioned magnets being in direct contact with the object to be measured. This would be of great use in cases where the vials are used in vertical and / or horizontal edges or in convex surfaces (eg tubes) along which the vial with the prismatic base is self-centered in the axial direction of the tube.

The state-of-the-art technology knows the use of rubber magnetic strips, which adhere to the exterior of the inclined surface. However, this solution does not generate sufficient magnetic flux to satisfy and maintain the weight of the spray or provide a sufficiently stable anchoring. Because, in addition, the straps made of rubber material do not provide endurance against wear. U.S. Patent No. 2007/0271802 describes an embodiment which comprises a portion of the features of the introductory part of the main claims in this document. U.S. Patent No. 2007/0271802 describes a vial whose body contains one or more ampoules for measuring the inclination of the surface of the body to be measured and to which the vial is positioned.

The abrasion has a flat (not cracked) body which can be made of various materials, for example, printed on plastic or aluminum, and can cover the base of the vial with a prismatic shape, that is, with a "V" surface, which is located between two flat surfaces. This shape of the surface facilitates the installation of the base of the libel on the elongated element with a convex cross-section.

The body of the vestibule is full of body and inside it from one end to the other does not contain any voids. Its body comprises only side openings extending transversally and intended for the carriers of the above ampoules. Basically, the vials are holes in which the magnets are installed (inserted into each hole in the base). These magnets can also be designed in accordance with the shape of the V-shaped surface on the basis of the libel so that they coincide with the inclined sides on this surface. Magnets are in direct contact with the body to be measured.

This arrangement of magnets has several drawbacks: firstly, iron powder on the surface on which the libel is placed can receive the surface of the magnet and permanently clamp the gap between the magnet and the hole, the place where it is installed, and therefore incorrectly displays the level of the base, which makes the information of the vial incorrect. These problems arise from the fact that every magnet is always exposed in a prominent place on the basis of the libel; whether it is V-shaped and in direct contact with the (convex) surface of the body to be measured, either having a flat base and not receiving the convex portion to be measured. US 2017/0003127 describes a concave profile with a completely flat base. Therefore, this relates to another type of libel, which differs from the present invention. Preliminary is described a libel comprising at least one magnet positioned within the body relative to the measuring surface through which the vial is placed on the body, the slope of which is measured. Each magnet is attached to its base or carrier, all together it is located inside the chamber, which is located within the vial.

Unlike US 2017/0003127, in which the basis is or the magnetic carrier is an essential element in the claim, in this invention the magnets are inserted inside the cavity and are in contact with the inner surface of the oblique sides of the base without the use of supports. In a position, they are simply retained by mechanical interference with the inner surfaces surrounding the cavity.

This American text describes this solution in contrast to the solution (shown in Figure 1 US 2017/0003127) from the previous technical state, where the magnet is positioned inside the body of the vortex and ends on the outer side of the body where the coplanar coincides with the measuring the surface (or the basis of the vial) to which the magnet is attached. US 2017/000312 also refers to EP 0 919 786, which describes the libel whose measuring surface represents the magnet space that combines the vial with the object to be measured. In conjunction with EP 0919786, in US 2017/0003127 it is stated that the previous solution implies the interruption of the measuring surface, and its construction is complicated and expensive, as it requires mechanical processing of the vial.

It seems therefore unlikely that an expert in this field would combine the knowledge from US 2017/0003127 with the previously described knowledge of 2007/0271802, since the magnets are also in a prominent position on the basis of a libel, as in EP 0919786, which would be it is necessary to improve on the basis of US 2007/0271802, because the subject of the latter text has been overcome.

The purpose of this invention is to provide a device or device. with a prismatic base that would simply be attached to the surface of the iron body, the inclination of which should be measured.

More specifically, the object of this invention is to offer a device of this kind which can be magnetically attracted to such flat surfaces in a vertical or oblique direction with respect to the reference base as well as horizontal or vertical edges, curved convex surfaces (horizontal or vertical), e.g. masts or pipes, without getting rid of these surfaces.

Another purpose is to offer such a device or a lightweight that can be easily fabricated and quickly assembled with low production costs.

These and other advantages, which the expert in this field immediately recognizes, can be achieved with a prismatic basis according to the content of the claim.

In order to better understand this invention, the following drawings are applied in a non-binding manner and as an example only: Example 1 shows a partial view in the perspective of the first libel according to the invention; Figure 2 shows the cross-section of the vial from the image l; Figure 3 shows a similar view as Figure 2, but the first version of the vial from Figure 2; Figure 4 shows another embodiment of the embodiment according to the invention; FIGS. 5 and 6 show a cross-section and a cross-section along line 6-6 of FIG. 5, yet another embodiment according to the invention; FIGS. 7 to 9 show further versions of the invention; Figure 10 shows the version of the invention shown in Figure 3, and Figure 11 shows a side view of the part of the invention shown in Figure 10.

According to the above-mentioned pictures, the vial according to the invention is generally labeled with 1 and comprises a body 2 made of a non-magnetic material, for example from a metal. The said body has adjacent, consecutive and mutually perpendicular sides 3, 4, 5; fourth page or. the base 6 of the sphere has at least two successive portions 7 and 8 that are inclined (inclined) and converge inside the cavity 10 in the body 2 bounded by pages 3, 4, 5, and 6.

The inclined parts 7 and 8 (positioned at an angle of 90 °) can be directly connected to the adjacent sides 3 and 5, or, even more preferably, connect them to these sides via short flat sections 11 and 12 performed on the basis of 6 libels perpendicular to the adjacent sides 3 and 5 and ending where the oblique parts 7 and 8 are started. These plane sections of the base 6 of the sphere create a sufficient base on the flat surfaces to measure their inclination relative to the reference horizontal surface. This measurement is carried out in particular using conventional indicators, for example, with an air bubble installed at the appropriate site, which are usually visible on pages 3, 5 and on page 4.

The inclined portions 7 and 8 and the flat sections 11 and 12 have matching inner surfaces 7A, 8A, 11A, 12A which are directed to the inside of the cavity 10 of the body 2 of the libellum, and the matching outer surfaces 7B, 8B, 11B, 12B facing outwards depending on the body (at least some of these surfaces, when placed on the surface that we must measure). The remaining sides 3, 4, 5 of the body 2 also have inner surfaces 3A, 4A, 5A facing the cavity 10, and the outer surfaces 3B, 4B, 5B facing outwardly with respect to the body 2.

In order to secure or anchor the hard metal surface (straight or edges) or the surface of the body containing iron metal bodies (eg walls or columns of reinforced concrete in which the reinforcement bars are located below the surface) during the measurement, without having to use a hand in order to keep it in place with a prismatic basis (with the basis 6 limited by the abovementioned oblique parts 7 and 8) in place, contains the magnet means 20 and 21 which are directly and in this order connected with the inner surfaces 7A and 8A of the sloping parts 7 and 8 of the base 6 of the spatula, which, via magnetic attraction, attach the libel to said surface (metallic or such that it contains iron metal parts).

Magnetic means 20 and 21 are more precisely permanent magnets, preferably in the form of a parallelepiped (in one piece or in several aligned pieces) or in the form of a disc. In order to optimize the forces of attraction with smaller pieces, it is recommended that permanent magnets are made of neodymium. These magnets are easily accessible on the market. Magnetic means 20, 21, in sufficient number to create the desired magnetic force, are inserted in length into the cavity 10 of the spikes, on each surface 7A, 8A of the base 6 of the sphere at both ends 10A of the body 2 of the spatula on which the plugs 19 are then mounted ( Figure 1 shows only one end). Said magnetic means have such thickness and dimensions that they can be longitudinally inserted into said cavity and their flat surfaces 20M and 21M are respectively arranged on the surfaces 7A, 8A of the parts 7, 8 of the base 6 of the sphere and are maintained in this (working) position due to interference with the corresponding contrast element located in the cavity 10 of the body 2 of the sphere. In this way, no layer of adhesive is required between the individual magnetic material and the surfaces 7A and 8A. Consequently, the installation of magnets in the cavity 10 of the body 2 of the spray is more secure, durable, simple and economical than in the case of the use of a glue.

Magnetic means 20, 21 are placed in the working position by sticking them forcefully (one after the other) into the cavity 10 from its ends 10A (which are then closed with a corresponding plug 19, see Figure 1). During insertion (or immediately after insertion into the cavity 10), the magnetic means 20, 21 cooperate with the corresponding contrast element so that they are immediately contained in the cavity 10 with interference.

In Figs. 2 to 11, various embodiments of the contrast element are shown. They will be described below.

In FIG. 2, the contrast element is a body 25 extending from the ends 26 and 27 of the surfaces 7A, 8A, and its shape in cross section resembles the shape of the mushroom. This contrast element has a central portion 30 of which a separate transverse head or transverse end 31 which includes the opposite outer sides 32 and 33 are positioned at a distance from and parallel to parts 7 and 8. These form a groove 34. The distance D between the said sides 32 and 33 and the said portions 7 and 8 is essentially equal to the thickness of the magnetic means 20, 21 which are stuck in each groove 34 and are in direct contact with the direct interference.

The solution in FIG. 2 provides for the possibility of using an iron or similar strip 36 which is positioned on each free side 37 of the magnetic means 20 and 21 opposite the contact surface 20M, 21M with oblique portions 7, 8 of the body 2 of the sphere. This strip closes the magnetic field generated by the magnetic means 20 and 21.

In Figure 3 (where the parts corresponding to the already described pictures are marked with the same reference numerals), the contrast element 40 is preferably hollow for easier deformation, which is indefinitely inserted into the cavity 10 and is preferably matched to the part of the cavity in has its upper part and has two lower portions 70 facing the magnetic means 20, 21 and are arranged in such a way that they are parallel thereto. The body 40 is made of non-magnetic material (for example, plastic or ABS) and can be inserted into the cavity 10 and extended in a direction perpendicular to the side 4 with an element that causes axial pressure, e.g. with a screw 41 with a nut 42 (as shown in Figure 10). Its deformation pushes the upper part towards the inner surface 4A of the side 4 and with the pressure portions 70 magnetic means 20, 21 against the sloping parts 7 and 8 and blocks them in the position.

In Figures 10 and 11, a variant of the solution of Figure 3 is shown. Here, where the parts corresponding to the already described pictures are marked with the same reference numbers, the contrast element or body 40 has no lower part paralleled by the inclined portions 7 and 8, but is directly pressurized by a plane surface 70A which is parallel to the side 4 to the magnetic means 20 and 21.

Figure 11 shows a possible (but not limiting) embodiment of a contrasting element or body 40 that deforms in a direction perpendicular to the side 4 with a screw 41 and a nut 42.

The solution of Figures 10 and 11 only indicates the function of the contrast body 40 which can be carried out in other already known and equivalent ways, e.g. with a profile with deformable ribs against the surface 4A or with an interrupted (cut) profile that deforms upon insertion, or the body is made of two parts (the upper and lower parts) between which a spring is pressed against it against the surface 4A and against magnetic medium 20, 21.

In FIGS. 4-9, where the parts corresponding to the already described pictures are marked with the same reference numerals, the contrast element is defined by at least one non-magnetic wall 50 which is transversely over the inclined portions 7 and 8 and is connected to the inner surfaces 3A and 5A sides 3 and 5 of the body 2. The distance of the wall 50 from the sloping parts 7 and 8 is such that the magnetic means 20, 21 (for example, in the form of a disc) can be "stuck" between the wall, between the surfaces 7A and 8A of these inclined parts 7 and 8 and between the inner surfaces 3A and 5A of the sides 3 and 5 of the body 2 of the spatula (and possibly between the surfaces 11A and 12A of sections 11 and 12, if present), with or without the use of additional external independent elements 36, 52.

In Figure 4, where the parts corresponding to the already described pictures are marked with the same reference numbers, the magnetic means 20 and 21 have a smaller dimension in the cross-section than the dimensions of the surfaces 7A and 8A of the sloping parts 7 and 8 on which they are leaning and interacting / interfere with the wall 50 and the sides 3 and 5. Magnetic elements 20 and 21 are further maintained in the position of the wall 50 and by the co-operation of the magnets with pages 3 and 5.

In FIGS. 5 and 6, where the parts corresponding to the already described pictures are marked with the same reference numerals, an embodiment is shown in which the magnetic means 20, 21 are disks as shown in FIG. 6 and have dimensions in the cross-section greater than the dimensions of the surfaces 7A, 8A of the sloping parts 7 and 8 and extending over their respective (connected) ends 26, 27 and directly leaning to the edges 20K and 21K on the wall 50, with the edges 20W and 21W on the faces 11A and 12A of the side 6 and with the edges 20X and 21X on the surfaces 3A and 5A of the sides 3 and 5. The magnetic means 20 and 21 are arranged offset one another, that is, they are alternately inserted in the cavity (seat) 85A and 85B, which are located between the part (side) 7 and the wall 50, and the part (side) 8 and the wall 50, affecting the inclined parts 7 and 8 along their entire width, thereby creating a magnetic force which allows the vapor to be adhered to at the edges of the columns, not only the iron, but also pillars of reinforced concrete, where they can be attracted to the arm The aturne rods, located under these pillars straight at the edges.

The advantage resulting from this is obvious: the use of such prismatic vents on two or more edges of the same pillar allows the verification of the vertical position in the room.

It should be noted that the magnetic means 20 and 21 in the embodiment in Figures 5 and 6 do not only represent the edges 20K, 20W, 21K and 21W that cooperate with the surface 53 (facing the oblique parts 7 and 8) of the wall 50 and on the surface (section ) 11A and 12A, but also the edges 20X and 21X cooperating with the adjacent surface 3A or 5A. This enables optimum locking of magnetic means on the sloping parts 7 and 8 along their entire length, and creating a magnetic attraction force also through the lower part (near the base 6 of the sphere) on the sides 3 and 5 of the level 1, which, together with the force of attraction through the sections 11 and 12, magnetic locking of the vial even on vertical flat surfaces.

To optimize the magnetic attraction force, all magnets that are inserted in the cavity (eg 85A) have the same polarity facing the wall 50 (for example, positively), whilst all the magnets inserted in the second cavity (85B) the opposite (negative) polarity facing the wall 50.

Figure 7 shows a "wedging" between the edges 20K, 20W and 21K, 21W magnetic means 20 and 21, which are initially freely inserted into the cavity 85 between the wall 50 and the sloping parts 7 and 8 with non-magnetic elements 52 (for example, plastic materials) which are stuck between the side 53 of the wall 50 facing the oblique parts 7 and 8, and the magnetic means 20 and 21. This allows the magnetic means to be blocked on the sloping portions 7 and 8. It is noted that magnetic means 20 and 21 oz. several permanent magnets, for example in the form of a disc, which are arranged longitudinally and connected to each of the sides 7 and 8, can be fixed (for example, by gluing or by a double-sided adhesive tape) to the band 36 of the iron material, so that only two magnet groups , one for each part 7 and 8, which are connected to each other by the respective strips 36 (similar to that in the embodiment of Figure 2).

The fact that individual magnets are grouped in only two independent groups that can be prepared outside the libel and then inserted as if they were two separate pieces greatly simplified assembly and reduced costs.

Figure 8 shows a further embodiment of the invention. In this figure, where the parts corresponding to the already described pictures are marked with the same reference numerals, the wall 50 is divided into two parts 50A and 50B which are carried out as a base over the sloping portions 7 and 8 of the page 6. Between portions 50A and 50B the walls (perpendicular to the surfaces 3A and 5A of the opposite sides 3 and 5) and the oblique sections 7 and 8 are arranged magnetic means 20, 21 on which the iron strips 36 are mounted. In the present solution, these bands touch the sides 3 and 5 of the body 2 of the vial and parts 50A and 50B of the wall (on page 53 facing the sloping portions 7 and 8), which forces magnetic means against the oblique parts 7 and 8 of page 6.

In FIG. 9, where the parts corresponding to the already described pictures are marked with the same reference numerals, an additional embodiment of the invention is shown, wherein the parts of the walls or supports 50A and 50B are inclined towards the oblique portions 7 and 8 of the base or the base 6 of the sphere against this basis). Partially 50A and 50B walls and magnetic means 20, 21, non-magnetic independent locking elements 52 (as in the embodiment of FIG. 7) are present, for example, plastic, ABS or other materials capable of engaging with magnetic means 20 and 21. These are touched with the edges 20K, 21K by said locking elements 52 and with the edges 20X and 21X of the sides 3 and 5 of the body 2 of the sphere. These locking elements 52 may also be freely inserted into the body 2 of the sphere after the insertion of the magnetic means 20 and 21, and then move towards the interior of the cavity 85 and press the magnetic means against the oblique parts 7 and 8. Also, in this case, using the elements 52, magnetic the means 20 and 21 (e.g., in the form of a parallelepiped) are stitched between the walls of the walls 50A and 50B, between the oblique parts 7 and 8 of the base of the vial and between the opposite sides 3 and 5, so that they are firmly positioned against the inclined portions 7 and 8 via interference.

With regard to the common feature of all described embodiments, the oblique sections 7 and 8, sections 11 and 12 and the sides 3 and 5, the latter, with respect to the size of their work in the vicinity of the base 6, are not equipped with openings that would connect the cavity 10 of the spatula with the exterior of the body 2 vials, thereby avoiding the risk of continuous accumulation of dirt or iron dust that could occur with openings (as may be the case in the case of the described level in US 2007/0271802). From this it follows that the exact operation of the spray is always ensured. Moreover, due to the absence of holes, the vial is more rigid, especially in models with a length of over 60 cm, where the number of magnets required to hold the weight of the vial is high.

Another common feature of all described embodiments is that the magnetic means 20, 21 are dimensioned so as to be "stuck" directly between the sides 3, 5 and possibly 11, 12 and between the contrast element (25, 50, 50A, 50B, 40) or by intermediate insertion of the non-magnetic 52 or iron element 36.

Thanks to the invention and the shape of the base 6 of the spatula, the body 2 of the vest is self-centered if placed on the iron surface with edges or non-ferrous (eg concrete), which contains iron bodies, such as reinforcing bars in reinforced concrete or iron curbs, or even on a round convex surface (e.g., a tube) and adheres to this surface due to the magnetic attraction generated by the magnetic means 20, 21 which are located within said body 2. The magnetic attraction force may be increased, if desired, between the design according to the number and shape magnetic means inserted into the libel near the two ends of the cavity 10 and on each face 7A, 8A of the sides 7, 8 and / or, if necessary, also in the central part or any other part of the cavity 10.

The present invention describes, therefore, the hollow profile, where magnets are positioned to optimize the transmission of the magnetic force to the body to be measured. The magnets are held in a position by interference with the wall and / or the inner parts of the vortex made of non-magnetic metal material (aluminum or aluminum alloys), and the closed base libels prevent the direct contact of these magnets with said body to be measured.

Libel 1, also due to the presence of straight sections 11 and 12 crossed by the magnetic flux of magnetic means 20 and 21, can be used on flat surfaces, leaving magnetically blocked (with magnets) in a vertical position or even horizontally facing the head, when the base is facing upwards. This libel is therefore versatile and allows you to perform measurements in such a way that it overcomes the gravity force and allows you to work with your free hands. There are obvious advantages for a user who, if he uses a vibe that automatically remains fixed in the desired position, can both hands free to work. This is particularly useful and effective in the case of a vial with a prismatic base whose specific application is primarily on the edges of the supports and pillars, on the edge of thin plates or on round convex surfaces such as pipes or poles. In the case of tubes or rods, the prismatic base is self-centered in the longitudinal direction of the axis, while in the case of edges of columns, simultaneously using two vials that remain magnetically fixed to two edges, a user with both hands free can also accurately place the tube or rod in the vertical direction.

The magnetic elements are located entirely inside the vial. The absence of openings or slots on the basis of the libel prevents the possibility of permanent accumulation of dust, dirt or small metal particles in these openings, making it very easy to clean the base of the peg with a palm. This is contrary to what is happening in known solutions, for example, in US 2007/0271802, where the magnets are in direct contact with the surface of the body to be measured as indicated in the introductory part of this description.

In addition, by appropriately dimensioning the size and shape of the cavity of the vortex, taking into account the standard magnetic elements (neodymium discs) available on the market at low prices, the magnetic force can be increased, if desired, at the design stage, by inserting a variable and sufficient number of magnets two sloping faces of the base, which ensures that we always have the desired force, without weakening the base, as otherwise it could happen by drilling a large number of holes in order to increase the number of magnets.

Various embodiments of the invention have been described. Still others are available according to the description and scope of the invention, as defined by the appended claims.

Claims (15)

PATENT CLAIMS A magnetic libel with a prismatic base, wherein the vial includes an air bubble, and the libel comprises a hollow body (2) with an inner cavity (10) and is made of a metal non-magnetic material, said body (2) of the vial comprising three side surfaces or (7, 8) converting towards the inner cavity (10) of said body (2) of the spatula, said second and second side members (3, 4, 5) are perpendicular to each other and a side or base (6) (3, 4, 5, 6), said oblique parts (7, 8) starting directly from the side surfaces (3, 5) of the libel which are adjacent to the base, or start after two short (11, 12) which are directly connected and perpendicular to the lateral surfaces (3, 5) of the libel, said bevel parts (7, 8) having said rectangular successive sides (3, 4, 5) and, if said short flat portions (11, 12), their inner surface (7A, 8A, 3A, 4A, 5A, 11A, 12A) are present, vv (10) and the outer surface (7B, 8B, 3B, 4B, 5B, 11B, 12B) outside the cavity (10), the libel (1) resting with the base (6) on the surface of the body, the inclination of which should be measured to the reference horizontal plane, characterized in that magnetic means (20, 21) are held on the inner surfaces (7A, 8A) of said oblique parts (7, 8) of the base (6) of the sphere, which is retained in the position of the interference with the contrast non-magnetic to the body (25, 40, 50, 50A, 50B) which is present inside the cavity (10) of the vestibule (1), wherein the base (6) is free of openings connecting the inner cavity (10) of the vial (1) with the exterior. Loop according to claim 1, characterized in that said contrasting body (25) is connected to the inclined portions (7, 8) of the base (6) of the libel. The abrasive according to claim 2, characterized in that said contrasting body (25) is lifted from the ends (26, 27) of said oblique parts (7, 8) towards the inside of the cavity (10), the contrast body comprising a part (30) , which is integrated with said oblique portions (7, 8), and at the end portion of which a transversal end (31) is arranged, which includes oppositely located outer sides (32, 33) which are located at a distance from and parallel to said slopes (34), wherein the distances between said inclined portions and said outer sides (32, 33) are equal to the thickness of the magnetic means (20, 21) and said groove (34) holds said magnetic means (20, 21) with interference. 4. The abrasive according to claim 1, characterized in that the contrast body (40) is a body, preferably a hollow which is deformable in a direction perpendicular to the side (4) which is opposite to the base (6) of the vestibule and is inserted into the cavity (10) (7, 8) of the body (2) and at least one lower part (70, 70A) is positioned opposite to the said oblique parts (7, 8) of the base (6) of the spatula, so that the cavities ) for the magnetic means (20, 21), wherein the magnetic means (20, 21) are pressed against the inclined portions (7, 8) due to the deformation of said deformable body after inserting the latter into the cavity (10) of the body (2) of the sphere an open end (10A) of the cavity (10). 5. The loop according to claim 1, characterized in that the contrasting body is at least one wall (50, 50A, 50B) located above said oblique parts (7, 8) of the base (6) of the libel so as to cooperate with the magnetic means (20, 21) and is connected at its ends with the inner surfaces (3A, 5A) of the opposite sides (3, 5) of the body of the vial. A looser according to claim 5, characterized in that two walls (50A, 50B) are provided that are located above each of the oblique parts (7, 8) of the base (6) of the spatula, wherein these walls protrude from the plates (3A, 5A) of the opposite sides (3, 5) of the body (2) of the spatula in the cavity (10) of the body (2) and the walls (50A, 50B) can be placed perpendicular to the wall (3, 5) from which they project, inclined on the wall (3, 5). The loop according to claim 1, characterized in that the magnetic means (20, 21) are composed of one or more pieces of permanent magnets, preferably in the form of a disk or parallelepiped, and of such dimensions and thickness that they can be longitudinally inserted into the cavity ( 10, 34, 85, 85A, 85B) of the body of the vortex so that with one of the flat surfaces (20M, 21M) is attached to the oblique parts (7, 8) of the base (6) of the spatula, said magnetic means being present at each inclined surface (7A, 8A) at least at the two opposite ends (10A) of the body (2) of the vial, which are closed by pins (19). A looser according to claim 7, characterized in that each oblique part (7, 8) fully cooperates across its entire width with a flat surface (20M, 21M) of the magnetic means (20, 21) having larger dimensions of the cross-section as oblique wherein the said magnetic means extends over the ends of said slanted parts and forms a shaft and alternately on each of the oblique parts within the respective cavity (85A) , 85B). Loop according to claim 1, characterized in that the magnetic means (20, 21) are neodymium. The loop according to claim 8, characterized in that all the magnets (20) in the first cavity (85A) of the spacer are arranged with the same first polarity directed towards the contrasting body (50), magnetic bodies (21) which are in the second cavity 85B), they are arranged with the same second polarity directed towards the contrasting body. 11. The abrasive according to claim 1, characterized in that the magnetic means (20, 21) are lined with edges (20W, 21W) on the faces (11A, 12A) of the short sections (11, 12) which are perpendicular to the sides (3, 5 ), and they end where the oblique parts start (7, 8). 12. The loop according to claim 1, characterized in that the magnetic means (20, 21) directly interfere with said contrasting body (25, 50, 50A, 50B) and extend over oblique parts (7, 8) or sides (3, 5) body (2) vials. A loop according to claim 4, characterized in that the magnetic means (20, 21) directly interfere with said non-magnetic contrasting body (40) which is longitudinally inserted into the cavity (10) of the libel (1) and is deformable. Libel according to claim 1, characterized in that the iron strips (36) or non-magnetic bodies (52) are inserted between the magnetic means (20, 21) and the contrast body (50, 50A, 50B). The abrasive according to claim 12, characterized in that the iron strips (36) are independent elements associated with magnetic means (20, 21) by gluing or double-sided adhesive tape, so as to form a single magnetic unit, the connection of said iron strips (36 ) to said magnetic means (20, 21) is carried out before being inserted into the vial.