. The Street railway journal . w Kensing-ton, Pa., has brought out recently an improved type of ellipticspring, which is now used in the electric motor trucks built by theStandard Steel Car Company, of Pittsburg, Pa. In motor trucks,owing to the limited wheel base between plates and the space neces-sarily occupied by the motor, the bolsters have to be very narrow,and hence the bolster springs are limited to double elliptics withleaves about 2>lA ins. or 4 ins. wide. To carry the load and at thesame time provide for sufficient deflection to insure easy riding, it isnecessary to make these sp
. The Street railway journal . w Kensing-ton, Pa., has brought out recently an improved type of ellipticspring, which is now used in the electric motor trucks built by theStandard Steel Car Company, of Pittsburg, Pa. In motor trucks,owing to the limited wheel base between plates and the space neces-sarily occupied by the motor, the bolsters have to be very narrow,and hence the bolster springs are limited to double elliptics withleaves about 2>lA ins. or 4 ins. wide. To carry the load and at thesame time provide for sufficient deflection to insure easy riding, it isnecessary to make these springs not less than 36 ins. long, and withas many as six leaves or even more; but it is a well-known factthat too many leaves in the ordinary type of elliptic spring causeit to be hard riding, owing to the excessive damping effect, due tofriction. The manufacturers experience confirms the belief thatthree or four-leaved springs are the easiest riding. In order tomake a six-leaf spring of ample strength that will ride as easily. NEW TYPE OF SIX-LEAF ELLIPTIC SPRING as a three-leaf spring, the six leaves have been divided into twosets of three leaves each, both sets being secured by one band,but beyond the band the sets are separated so that no friction is pro-duced between them. The outside set carries a plate which connectsthe upper and lower sets of the spring and the inside set has thelong leaves merely resting together at their ends, as is shown inthe illustration. The action of this spring is precisely the same asa quadruple elliptic three-leaved spring of the same length andwidth of leaves, which is equal in good riding qualities to the bestsprings used on steam railroad passenger cars. The Union Spring & Manufacturing Company was one of thefirst independent spring manufacturers to go into business after theformation of the Railway Steel Spring Company. It manufactures helical and elliptical springs for all types of rolling stock, as wellas pressed steel spring plates and
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
