Brakes – Vehicle – Railway
Patent
1998-04-02
1999-11-09
Oberleitner, Robert J.
Brakes
Vehicle
Railway
188165, B61H 700
Patent
active
059796103
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a rail brake device having permanent magnetic energization, comprising a housing of magnetizable material, which housing is mounted for up and down movement and has at least one permanent magnetic element which in an operating position of the rail brake device is magnetically coupled to a rail above which the rail brake device is located, and which in the rest position of the rail brake device is not magnetically coupled to a rail.
Such rail brake devices are already known, for instance from applicant's European patent 0 361 582. The object of the invention is to provide an improved, reliably operating rail brake device of relatively simple and robust construction. To this end, in accordance with the invention, a rail brake device of the above-described type is characterized in that the permanent magnetic element is fixedly mounted along a first wall of a cavity in the housing; that located in the cavity is a switching element of magnetizable material, which switching element is slidable back and forth, by means of operating means, along the magnetic element and along a second wall of the cavity, located opposite the first wall; that the second wall of the cavity comprises at least two parts separated by a magnetic barrier, wherein, in the rest position of the brake device, the switching element forms a magnetic connection between the permanent magnetic element and a part of the second wall of the cavity which, via magnetic material of the rest of the housing, is in direct connection with a side of the permanent magnetic element facing away from the switching element, while in the operating position of the brake device, the switching element forms a magnetic connection between the permanent magnetic element and another part of the second wall, which part of the second wall is magnetically separated from the rest of the housing, but magnetically coupled to a wearing piece of the brake device, which wearing piece is magnetically coupled, via an air gap and a second wearing piece, to the rest of the housing.
Hereinafter, the invention will be further described with reference to the accompanying drawing of an exemplary embodiment.
FIG. 1 schematically shows, in cross section, an example of a rail brake device according to the invention;
FIG. 2 schematically shows, in cross section, a part of the device shown in FIG. 1, in the rest position;
FIG. 3 schematically shows, in cross section, a part of the device shown in FIG. 1, in the active position;
FIG. 4 schematically shows a second example of a rail brake device according to the invention, in the active position; and
FIG. 5 shows the rail brake device of FIG. 4 in the rest position.
FIG. 1 schematically shows, in a cross section, a rail brake device 1 according to the invention in position above the head of a rail 2. The rail brake device shown is in particular, but not exclusively, suitable for use in a system with low-suspension, wherein the brake shoe in the rest position is suspended fairly close above the rail. The intermediate distance can for instance be 10 mm. Such a brake system can for instance be used in trams, metro trains and the like.
The rail brake device shown comprises a housing 3 of magnetizable material, such as for instance (cast) steel. The housing is formed so as to be about C-shaped and has a cavity 4, wherein, on the top side thereof, a permanent magnet 5 is mounted, magnetized in a substantially vertical direction, as indicated by an arrow 6.
It is observed that in a direction extending transversely to the plane of the drawing, the housing 3 can have a considerable length. The magnet 5 can consist of a number of short sections. The housing, too, could be built up from sections, but preferably consists of one whole, at least in the longitudinal direction, apart from end sections not shown. The magnet is at its bottom side provided with a pole plate 7 which is attached to the magnet in a suitable manner, for instance through glueing, and which is manufactured from magnetizable material, for instance steel.
At the
REFERENCES:
patent: 5018605 (1991-05-01), Hooghiem et al.
patent: 5647458 (1997-07-01), Ven Der Sloot et al.
Oberleitner Robert J.
Sab Wabco B.V.
Sy Mariano
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