Class / Patent application number | Description | Number of patent applications / Date published |
219053000 | Rail bond | 8 |
20080217299 | Conductor rails - A method of manufacturing a conductor rail comprising a main body ( | 09-11-2008 |
20080230520 | Method For Welding Two Rails of a Track - The invention relates to a method for welding two rails ( | 09-25-2008 |
20110168675 | WELDING UNIT FOR WELDING RAILS OF A TRACK - A welding unit for welding rails of a track includes two unit bodies that can be moved in relation to each other by displacement cylinders along unit guides running parallel to the rails. The displacement cylinders are connected both to pull rods and to a crossbeam. Thus a simple design having high tensile forces is possible. | 07-14-2011 |
219055000 | Resistance weld methods | 5 |
20100051585 | Welding head rail squaring process - An improved method for executing a flash butt weld to join first and second rail segments includes applying a voltage to the first rail segment and the second rail segment to establish a voltage difference between the first and second rail segments. The rail end faces are brought into contact, resulting in an electrical current between the first rail end face and the second rail end face, resistively heating material at the interface. As material burns off at the interface, the power consumed at the rail end interface as a function of rail displacement is periodically sampled. If the comparison indicates that the power per unit of rail displacement is not increasing from sample to sample, the burn-off process is terminated. In a further aspect, if the power per unit of rail displacement exceeds a predetermined threshold, the burn-off process is terminated. | 03-04-2010 |
20100155372 | Welding process with jerk compensation - An improved welding head for creating an in-track weld between a first rail segment and a second rail segment includes a controller having computer-readable instructions read by the controller. The computer-readable instructions include instructions for compensating for rail jerk during in-track welding. The welding head includes a closing force actuator, such as a hydraulic cylinder, for moving the rail segments toward one another. A pressure transducer is monitored during welding to determine a closing force. An impending jerk of the rail movement is detected if an abnormal closing force change is observed, and in response the flow of hydraulic fluid into or out of the hydraulic cylinder is restricted to prevent or minimize the jerk. In addition, when an impending jerk is detected the weld current may be temporarily increased to burn or prevent the formation of short circuit paths between the rails. | 06-24-2010 |
20130008874 | MACHINE FOR FLASH-BUTT WELDING OF RAILS - A machine for the flash-butt welding of rails has two tong-type clamping devices, made in the form of two double-arm levers mounted on a common central axle and isolated from one another, hydraulic cylinders of clamping and displacement of parts being welded, two welding transformers built into double-arm levers of one of two tong-type clamping devices, and current-carrying elements which include rods of displacement and upsetting, electric contacts-yokes and flexible jumpers. The electric contacts-yokes have controlled drives and the upper part of each electric contacts-yoke has holes, through which guide pins are passed, and a retaining spring is fixed on a lateral surface of the electric contacts-yoke. | 01-10-2013 |
20130284705 | WELDING HEAD RAIL SQUARING PROCESS - An improved method for executing a flash butt weld to join first and second rail segments includes applying a voltage to the first rail segment and the second rail segment to establish a voltage difference between the first and second rail segments. The rail end faces are brought into contact, resulting in an electrical current between the first rail end face and the second rail end face, resistively heating material at the interface. As material burns off at the interface, the power consumed at the rail end interface as a function of rail displacement is periodically sampled. If the comparison indicates that the power per unit of rail displacement is not increasing from sample to sample, the burn-off process is terminated. In a further aspect, if the power per unit of rail displacement exceeds a predetermined threshold, the burn-off process is terminated. | 10-31-2013 |
20130284706 | Method for Repairing Metallic Structure - A rail repair method enables repair of rails and rail-like structures. A rail defect is initially identified and removed as contained within a volumetric material portion so as to form a contoured void while maintaining continuity of the rail opposite the void. A pre-formed insert is then placed into the void thereby effecting a rail-to-insert interface. Current is driven through the interface as force directs the insert against the rail. Resistance heat and pressure weld the insert to the rail. The flash welding aspects remove oxides and other impurities from the interface, and the forge welding aspects create a robust solid state weld. Excess material, whether flash, rail, or insert-based, is removed during the finishing processes to provide a virtually seamless rail repair. The solid state weld repair methodology may be used to repair any number of targeted metallic rail-like structures. | 10-31-2013 |