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US 4,363,277 AGranted
Stabilizing high speed railway truck safety device
AssigneeDofasco Inc.
InventorsHenry Martin, Charles R. Thompson
Life of this patent
Estimating the term…
Abstract
A safety device for a banking vehicle includes a pair of cylinders which extend to hold the superstructure in an upright position. The cylinders are hydraulically connected to an accumulator which provides a pressurized fluid reservoir. A valve controls flow from the accumulator to the cylinders. Upon detection of a failure in one of the vehicle systems the valve moves to a position in which fluid flows from the accumulator to extend the cylinders. A pilot operated check valve is positioned between the accumulator and the cylinders to hold the cylinders in the extended position until the failure is rectified.
Claims11
For use in a railway truck assembly comprising:
- a frame;
- at least two wheel and axle assemblies mounted by the frame and on which the vehicle runs;
- a bolster member mounted on the frame and adapted to support a vehicle body thereon for pivoting and tilting movement relative to the frame;
- mounting means connecting the bolster member and the frame for the said tilting movement of the bolster member relative to the frame;
- first motor means connected between the bolster member and the frame and operative upon the supply of power thereto from a power source to produce the said tilting movement therebetween;
- and
- a safety device comprising hydraulic second motor means mounted by the frame and operable between a first condition in which it engages the bolster member to inhibit tilting thereof relative to the truck frame and a second condition in which said tilting is permitted;
- a control circuit for said hydraulic second motor means, said control circuit comprising a pressure line connected to a source of pressurized fluid, a return line connected to a sump for the pressurized fluid, a pair of hydraulic service lines connected to opposite sides of said hydraulic second motor means, valve means connected to said service lines and said pressure and return lines and operable in a first position to direct fluid from said pressure line to one of said service lines to move said motor means to said first condition and in a second position to direct fluid from said pressure line to the other of said services lines to cause said motor means to move to said second condition, control means to move said valve means between said first and second positions and a pressurized fluid reservoir connected to said pressure line and operable to supply pressurized fluid to said valve means whereby, upon movement of said valve means to said first position, said pressurized fluid reservoir supplies fluid to said one service line to move said motor means to said first condition.
5 more elements
For use in a railway truck assembly comprising:
- a frame;
- at least two wheel and axle assemblies mounted by the frame and on which the vehicle runs;
- a bolster member mounted on the frame and adapted to support a vehicle body thereon for pivoting and tilting movement relative to the frame;
- mounting means connecting the bolster member and the frame for the said tilting movement of the bolster member relative to the frame;
- and
- first motor means connected between the bolster member and the frame and operative upon the supply of power thereto from a power source to produce the said tilting movement therebetween;
- a safety device comprising hydraulic second motor means mounted by the frame and operable between a first condition in which it engages the bolster member to inhibit tilting thereof relative to the truck frame and a second condition in which the said tilting is permitted;
- the safety device including a control circuit for said hydraulic second means, said control circuit comprising a pressure line connected to a source of pressurized fluid, a return line connected to a sump for the pressurized fluid, a pair of hydraulic service lines connected to opposite sides of said hydraulic second motor means, valve means connected to said service lines and said pressure and return lines and operable in a first position to direct fluid from said pressure line to one of said service lines to move said motor means to said first condition and in a second position to direct fluid from said pressure line to the other of said service lines to cause said motor means to move to said second condition, control means to move said valve means between said first and second positions and a pressurized fluid reservoir connected to said pressure line and operable to supply pressurized fluid to said valve means whereby, upon movement of said valve means to said first position, said pressurized fluid reservoir supplies fluid to said one service line to move said cylinder to said first condition, said pressurized fluid reservoir including a variable volume fluid receiving chamber and biasing means to reduce the volume of said chamber to a minumum.
5 more elements
Dependencies are inferred from the claim text.