. Electric railway journal . of themovement of the truck carrying the driving motor. A screwadjustment and guide are provided for feeding the grindingwheel down in the skate. As the skate slides along therail on two perfectly flat faces, it is obvious that the crestsof the corrugation waves will be ground off, and finally aperfectly flat and smooth surface reproduced on the railhead. The effect is really the same as that obtained by acarpenter truing up the wavy edge of a board with a plane. The machine is also arranged so that it may be used togrind out the small grooves worn by the wheel fla
. Electric railway journal . of themovement of the truck carrying the driving motor. A screwadjustment and guide are provided for feeding the grindingwheel down in the skate. As the skate slides along therail on two perfectly flat faces, it is obvious that the crestsof the corrugation waves will be ground off, and finally aperfectly flat and smooth surface reproduced on the railhead. The effect is really the same as that obtained by acarpenter truing up the wavy edge of a board with a plane. The machine is also arranged so that it may be used togrind out the small grooves worn by the wheel flanges atthe bottom of the grooves of switch point mates. Thesegrooves cause bumping of the cars, and are also, no doubt,the cause of many broken axles. For this purpose the ma-chine is provided with a second set of skate faces and anarrow grinding wheel is used. The power required is small. When the machine is run-ning light—that is to say, with the grinding wheel nottouching the rail—the motor of the machine shown in the. Rail Grinder for Removing Corrugations engraving takes il/2 kw. When grinding corrugations, theaverage input is kw, and the maximum about 5 motor is rated at 5 hp, and the drive is to a counter-shaft, and thence to the skate by means of two Renoldschain belts. Power is taken from the trolley. The slowtraverse along the track of about 5 ft. to 8 ft. per minuteis obtained by winding up a small steel rope on the winchseen at the left end of the machine. The other end of therope is fixed to a stake driven between the paving blocks. August 21, 1909.] ELECTRIC RAILWAY JOURNAL. 293 AUTOMATIC COUPLERS FOR ELECTRIC CARS The W. T. Van Dorn Company, Chicago, 111., has re-cently perfected and placed on the market several newtypes of drawbars for electric railway cars, which are de-signed to meet the special conditions encountered and toperform extraordinary service. All of these new typesare built along the same substantial lines as the older de-signs of c
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