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| Number | Title | Issue Date |
| 7363864 | Mechanic's track creeper A mechanic's track creeper is described, which includes a body, and a rail interface coupled to the body, wherein the rail interface of the creeper is operatively engageable with a rail having a translational axis, wherein the rail interface of the creeper comprises... | 04/29/2008 |
| 7292144 | Apparatus and method for contact-less switching An apparatus and method for use with a railroad dragging equipment detecting (DED) system that detects objects hanging from and dragged beneath a train as the train travels along rails of a railroad track. A generator supplies a first signal and is coupled to a magn... | 11/06/2007 |
| 7279654 | Current sensor A current sensor for installation on a conductor without breaking the conductor may include an insulating base having a conductor supporting portion and a conductive coil disposed within an outer surface of the insulating base. A magnetically permeable conductor ret... | 10/09/2007 |
| 7148679 | Transformer probe A probe (10) for sensing movement of a body of magnetic material comprises a magnetically energisable pole piece (30), a closed loop electrical circuit (20) having a first end (25) which is wound around the pole piece (30) and form... | 12/12/2006 |
| 7053606 | Measurement of residual and thermally-induced stress in a rail In a railway line, thermally-induced stresses are a factor for both rail breaks and rail buckling. These stresses are in the longitudinal direction. A nondestructive measuring technique enables the residual stress in a rail to be determined, and hence the thermally-... | 05/30/2006 |
| 6995556 | Electromagnetic gage sensing system and method for railroad track inspection An electromagnetic gage sensing system having sensor heads positioned over each rail of a railroad track that measures both rail gage and height distance above the rails of a railroad track. Each sensor head includes an array of electromagnetic field generating coil... | 02/07/2006 |
| 6819241 | System and method for scanning individuals for illicit objects A system and method for scanning individuals for illicit objects include the ability to scan a wheeled user transport device and an individual being transported thereby for metallic objects and to determine whether an illicit object may be present, without activatin... | 11/16/2004 |
| 6779761 | Broken rail detection A break in a rail, where two rails (12, 13) extend parallel to each other along a railway line, is detected by connecting the two rails together electrically with two electrical connections (16, 18) at opposite ends of a section of the line, causing el... | 08/24/2004 |
| 6768298 | Transverse crack detection in rail head using low frequency eddy currents A method and system for detecting transverse cracks beneath horizontal cracks in the rail way track. As a transporter moves over rail, a saturation magnetic field is generated into and across the rail head using a toroidal-shaped DC saturation magnet located a prede... | 07/27/2004 |
| 6594591 | Method and system for processing rail inspection test data A data processing system is provided for use in conjunction with a rail inspection system having a detection carriage with a plurality of sensor units configured to sense discontinuities in a rail of a railroad track as the detector carriage travels along... | 07/15/2003 |
| 6549005 | Magnetic detection of discontinuities in railway rails using hall effect sensors A method and apparatus for high speed magnetic detection of surface fatigue cracks in railway rails. The magnetic material of the rail is magnetized by touch magnetization using a permanent magnet (31), leaving a remanent magnetic field. A sensor head (30... | 04/15/2003 |
| 6476603 | Brush assembly for magnetic induction test apparatus A brush assembly for engaging and conducting electricity to or from a surface is provided. The brush assembly comprises a monolithic, electrically conductive bus block and a bristle holder removably attached to the bus block. The bristle holder is formed ... | 11/05/2002 |
| 6262573 | Electromagnetic system for railroad track crack detection and traction enhancement An electromagnetic system for detecting cracked rail and enhancing traction when necessary, includes wiring coils around wheel axles, and a corresponding power source for supplying power to the coils for producing electromagnetic flux. The produced electr... | 07/17/2001 |
| 5825177 | Device for measuring the speed of a rail-mounted vehicle A rail mounted vehicle speed measuring device includes a first magnetic field generating member and a first magnetic field sensing member positioned at a first measuring location on the vehicle; a second magnetic field generating member and a second magne... | 10/20/1998 |
| 5654634 | Method for detecting gaps to be bridged in the power supply of an electric rail vehicle A method for detecting gaps to be bridged in a power supply of an electric rail vehicle includes continuously sensing at least one conductor rail for gaps with at least one contact signal transmitter travelling ahead of a plurality of electrically interco... | 08/05/1997 |
| 5045787 | Apparatus and method for measuring insulated track joint resistances A technique for measuring the insulation resistance of an insulated rail joint in the presence of leakage ground resistance (ballast resistance), as well as other track run-around paths, without the use of calibrated meters, such technique characterized b... | 09/03/1991 |
| 4672230 | Electronic proximity switch device An electronic switch of the type having two external lines, one of which is connected to one pole of an operating voltage source in series with a load and the other of which is connected with the load. The switch comprises a sensor, e.g. an oscillator, re... | 06/09/1987 |
