. The Street railway journal . nd the top of the track is 4I/4 motor without gear or gear case weighs 1865 lbs., and com-plete, with both gear and gear case, weighs 2150 lbs. Duplex Trolley Base The trolley base shown in the accompanying illustration wasinvented by a mechanic who for many years has been employed inthe repair shops of a prominent electric railway company. Thedevice is known as the Moyer duplex trolley base. A number ofthese bases have been in constant use for the past six months andhave withstood all the tests made under every possible conditionof hard service in a high
. The Street railway journal . nd the top of the track is 4I/4 motor without gear or gear case weighs 1865 lbs., and com-plete, with both gear and gear case, weighs 2150 lbs. Duplex Trolley Base The trolley base shown in the accompanying illustration wasinvented by a mechanic who for many years has been employed inthe repair shops of a prominent electric railway company. Thedevice is known as the Moyer duplex trolley base. A number ofthese bases have been in constant use for the past six months andhave withstood all the tests made under every possible conditionof hard service in a highly satisfactory and successful way. The base is made of carefully selected material, and the variousparts are strong and designed to meet severe wear and tear. Itswings on a pivotal pin and is sensitive to every deflection of thetrolley as it follows the line, and it can be used where bridges andarches bring the wire to within 70 ins. of the roof of the car. Thetwo distinct sets or pairs of coil extension springs can be easily. DUPLEX TROLLEY BASE adjusted and regulated, permitting the stretch of spring to betaken up and corrected when necessary. The springs used aresufficiently strong to maintain a tension of 1400 lbs. at the footof the pole, and this provides a reliable contact under all condi-tions between trolley and line. By a simple mechanism the re-serve duplex set of springs can be put into immediate service byswinging the base round into position. When not in use. theduplex springs are always in readiness to take up any sudden ten-sion that may be put upon them; the jumping of the trolley fromthe wire, releasing the pole, brings them into action as soon as thepole swings forward and is past the perpendicular, and the springswithout sudden check or jar restrain and lessen the force of the blow which the pole would otherwise give to any interposing ob-ject. Patents for this device have been applied for in the UnitedStates of America, Canada and all the important countrie
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
