. Electric railway journal . n the tangent line and a very short distance forthe wheel to travel on its flanges. The short flange travel reducesarcing and greatly increases the life of the frog and mechanical features mentioned allow the frog to be placed4 ft. further back from the track frog and permit centering thefrog with the track, thus avoiding kinks in the tangent wire andavoiding dragging the wheel at an angle to the line when thecar is taking the curve. Another feature of the trolley frogis the long, flexible approach. This approach prevents thewheel from striking a blow and
. Electric railway journal . n the tangent line and a very short distance forthe wheel to travel on its flanges. The short flange travel reducesarcing and greatly increases the life of the frog and mechanical features mentioned allow the frog to be placed4 ft. further back from the track frog and permit centering thefrog with the track, thus avoiding kinks in the tangent wire andavoiding dragging the wheel at an angle to the line when thecar is taking the curve. Another feature of the trolley frogis the long, flexible approach. This approach prevents thewheel from striking a blow and thus avoids crystallization ofthe wire. A large space and a preventer between the twoapproaches prevent a wild wheel from jamming and make itunnecessary to construct additional preventers. Differing from frogs of earlier design this frog allows thecurve wire to be run through and dead-ended in a strain guywith obvious advantages. The main line is relieved of unduestresses and the trolley wire need not be cut when it becomes. Two Views of Trolley Frog necessary to replace a frog, nor is any block and tackle neces-sary in such cases. The mechanical construction of the frog is such that it can-not buckle, but remains always level and smooth under run-ning. The frog is installed over a point 18 ft. from the trackfrog for standard 18-ft. to 20-ft. trolley for all curves up to 80 ft. radius. For longer curves this distance is increasedaccordingly. When properly placed the turn-out points directlyto the first curve pull-off, thus avoiding a bend at the frog. A NEW SLEET CUTTER The Bonney-Vehslage Tool Company, New York, has recent-ly placed upon the market the B-V sleet cutter, which is ofthe simple type shown in the three accompanying illustrations.
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Keywords: ., bookcentury1900, bookdecade1900, bookidelectricrailway371911newy
