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US 5,018,605 AGranted
Magnetic rail brake device
AssigneeTebel Pneumatiek B.V.
InventorsJelle Hooghiem, Bart van der Sloot, Sytse Epema
Life of this patent
Estimating the term…
Abstract
A magnetic rail brake device for rail vehicles, comprising one or more pairs of brake blocks adapted to be pulled, in operation, magnetically against the rail. The brake device is characterized by at least one permanent magnet movable up and down in a magnet housing. The magnet housing is arranged in such a manner that in rest position of the permanent magnet in the magnet housing, the magnetic field lines close through an upper portion of the magnet housing. In an operating position of the magnet in the magnet housing, the field lines can extend through pole pieces within brake block members of magnetizable material which can be brought into contact with the rail.
Claims20
A magnetic rail brake device for rail vehicles, comprising:
- (a) at least one pair of brake blocks adapted to be engaged magnetically against the rail;
- (b) at least one permanent magnet, the permanent magnet generating magnetic field lines;
- (c) a magnet housing, the magnet housing being formed so as to have a substantially inverted u-shaped upper portion created by a top plate and an adjoining first side plate and an adjoining second side plate;
- (d) a double acting cylinder, further comprising:
- (i) a cylinder block;
- (ii) a piston, the piston traveling within the cylinder block;
- (iii) at least one port, the port permitting adjustment of piston position within the cylinder by a pressure medium;
- (iv) a piston rod;
- (v) at least one spring, the spring permitting biasing of the piston position within the cylinder block;
- (e) a universal joint, the universal joint being operatively interconnected between the piston rod and the magnet housing, such that the magnetic field lines close through an upper portion of the magnet housing when the permanent magnet is in a first position, and in a second position of the permanent magnet in the magnet housing the field lines can extend through pole pieces within brake block members of magnetizable material adapted to be brought into contact with the rail the second position being reached by unidirectional movement of the permanent magnet and the pole pieces;
- and
- (f) a dust hood, the dust hood being formed as a bellows surrounding the universal joint, thereby protecting the universal joint against dust and dirt.
9 more elements
A magnetic single rail brake device comprising:
- (a) at least one pressure actuated cylinder, the cylinder being pivotably affixed to a carriage frame of a vehicle to be braked;
- (b) at least one piston rod, each piston rod being slidably mounted within each cylinder;
- (c) at least one universal joint, each universal joint being operatively connected to an end of the piston rod external to the cylinder;
- (d) at least one permanent magnet;
- (e) at least one magnet housing, the magnet housing having a substantially inverted u-shaped upper portion formed with a top plate and two side plates, the top plate having an opening, the opening permitting the universal joint to enter the magnet housing, the universal joint being mechanically linked to the permanent magnet;
- (f) at least one brake shoe, each brake show being formed as a plurality of sections located sequentially along a line substantially perpendicular to the piston rod, the brake shoe being mechanically linked to the permanent magnet such that the brake shoe tends to engage the rail when the piston rod moves in a downward direction, an upper portion of the magnet housing being connected to pole pieces within the brake shoe through structural members of non-magnetizable material;
- (g) at least one guide member, the guide member being located at an end region of the brake device, the guide member being attached to the magnet housing, the guide member moving in a substantially vertical direction and engaging a portion of the carriage frame during said vertical movement;
- (h) at least one end plate, the end plate being mounted at a face of the magnet housing, the end plates being formed of a non-magnetizable material, the end plate including an end part, the end part tending to guide the brake shoe over any obstacle encountered along the rail;
- and
- (i) a pressurization system, the pressurization system comprising:
- (i) a switch valve;
- (ii) a switch lever, the switch lever operating the switch valve;
- (iii) a cam member, the cam member being mechanically coupled to the permanent magnet, the cam member operating the switch lever;
- (iv) at least one supply line, the supply line being mechanically coupled to and in fluid communication with each pressure actuated cylinder;
- (v) a pressure medium, the pressure medium being supplied to the cylinders via the supply line in response to actuation by the cam member, said pressure actuation being relieved when the permanent magnet pulls itself toward the rail, thereby reducing cylinder wear.
12 more elements
Dependencies are inferred from the claim text.