. The Street railway journal . TRACK DRILL WITH EXTENSION CRANKS work the drill, one at each crank. The drill is provided withan automatic friction feed to adjust the feed rate, this feedacting also as a c]uick return of spindle by reversing thecranks. The leverage of the crankshafts can be lengthenedor shortened, according to the power and speed required,and other adjustments made for different demands. Thesocket is bored for 41-64 straight shank drills, and a sleeveis provided so that drills with a J^-in. straight shank canalso be used. One revolution of the crankgives one revolution of the
. The Street railway journal . TRACK DRILL WITH EXTENSION CRANKS work the drill, one at each crank. The drill is provided withan automatic friction feed to adjust the feed rate, this feedacting also as a c]uick return of spindle by reversing thecranks. The leverage of the crankshafts can be lengthenedor shortened, according to the power and speed required,and other adjustments made for different demands. Thesocket is bored for 41-64 straight shank drills, and a sleeveis provided so that drills with a J^-in. straight shank canalso be used. One revolution of the crankgives one revolution of the drill. Whenthe top yoke is removed and one crankis put on the upright shaft, a speed of onerevolution of the crank to two revolutionsof the drill is obtained. A radical im-provement has also Ijeen made over theordinary track drill in that the lower gear-ing parts have been enclosed to removethe possibility of dust, gravel and othersubstances getting into the lower gearsand interfering with the smooth and nat-ural working of th
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
