FR2597933A1 - Improved magnetic fastening device - Google Patents

Abstract

Magnetic fastening device which comprises a magnet or ferrite object 2 placed between two polar bodies 1a, 1b, said polar bodies possessing at least one lateral flange 3 to prevent the ferrite object 2 from sliding out from between the said bodies. The device may be wholly or partly enclosed within an outer coating.

Description

Improved magnetic fixing device.

 Magnetic fixing devices generally comprise a ferrite or permanent magnet and two polar masses.

 The ferrite is held between the two polar masses by magnetic attraction but this force of attraction is not sufficient to make the assembly defective and without sliding. It is therefore necessary to carry out a complementary fixing operation such as bonding.

 The invention makes it possible to remedy this drawback by proposing polar masses having at least one lateral flange intended to prevent the sliding of the ferrite between said masses towards the outside.

 The invention therefore makes it possible to obtain a magnetic fixing device which is effective and in which the ferrite is trapped between the two polar masses. In addition, the invention makes it possible to obtain a more intense bonding force between the magnetic device and the metal support.

Thus, when the magnetic device according to the invention is partially included in an external coating Cre-sie, concrete ..t), the anchoring of the latter is reinforced by the edges of the polar masses, which in addition make it in this case polar masses and ferrite totally indis sociable
In another embodiment, the bulk masses are pierced with holes intended to receive mounting screws. The heads of the screws are set back with respect to the magnetic contact surface between the ferrite and the polar masses.

- The invention will be better understood on reading the description which will follow with reference to the accompanying drawings in which
Figure I is a perspective view of the device according to the invention.

FIG. 2 is a sectional view of a mode of embodiment comparable to that of FIG. I but with polar masses pierced with holes for the installation of mounting via or other fixing elements,
Figures 3 and 4 are perspective views of other embodiments of the invention.

 Figures 1 and 2 show the pole masses (la, lb), the ferrite (2) with a rectangular section or the like coming to lodge between the 2 pole masses (la, lb) with their lateral edges (3). On the polar mass (lb) (Figure 2) are provided holes (4) intended to receive the mounting screws- (5). These holes (4) are made so that the screw heads (5) are set back relative to the contact surface (6) with the ferrite (2).

 FIG. 3 shows another embodiment of the insertion in which the lateral flange (3) is only produced. on only one of the longitudinal edges of the polar masses (1).

The device to be included is fixed on a metal support (7), the external coating is not shown.

 FIG. 4 represents polar masses (1) in the form of an H. This embodiment allows better anchoring of the magnetic device in the external coating thanks to the external extension (8) of the flanges (3).

 Of course, various modifications can be made by ltho, even in the art, to the device which has just been described by way of nonlimiting example, without departing from the scope of the invention.

Claims (3)

 Magnetic fixing device which comprises a magnet or ferrite (2) placed between two polar mas-ses (la, 1b), characterized in that said polar masses have at least one lateral flange (3) intended to prevent sliding of the ferrite ( 2) between said masses towards the outside. 2. Device according to claim i, characterized in that it can be partially or totally included in an external coating. 3. Device according to one of the preceding claims, characterized in that the polar masses (la, lb) have flanges (3) with external extensions (8) to allow better attachment in the outer coating.