. American engineer and railroad journal . frame is a decidedly new de-parture, This speed variaior has iwo Bhafta, i and 2, each withseven gears to it. proportioned for seven speeds in geometricalprogression. These cones of gears are aot in mesh with eachother, but all are Axed to iheir shafts, except the largest drivengear on the variable speed shall 2, which is connected to it bya pawl and ratchet arrange nt a connection between this ratchet gear and the smallest gearon the driving or constant-speed shaft 1, is formed by an idlerpinion. 8, causing the driven shall to run always at the slowe
. American engineer and railroad journal . frame is a decidedly new de-parture, This speed variaior has iwo Bhafta, i and 2, each withseven gears to it. proportioned for seven speeds in geometricalprogression. These cones of gears are aot in mesh with eachother, but all are Axed to iheir shafts, except the largest drivengear on the variable speed shall 2, which is connected to it bya pawl and ratchet arrange nt a connection between this ratchet gear and the smallest gearon the driving or constant-speed shaft 1, is formed by an idlerpinion. 8, causing the driven shall to run always at the slowest Speed. When the S| I of tile variable-Speed shall, 2, is in creased by proper adjustment of pinion, 1, the ratchet fixedon this shaft runs ahead of the pawl in the loose gear, but inthis way shaft 2 is always kept in motion. The lever with handle, :,, shown in front of the speed vari-aior, is mounted and swings ;.i the rear on a rocker frame, 6,and is so arranged that it can be shifted lengthwise or cross- 1 lZ +_Y5 . l .> Vt-I-/ICn. 60.—DETAILS OF THE main DRIVE \ TRIABLE-SPEED MECHANISMiskii UPON 111 I M • \\ DE8I0N OF DRESES RYDIA1 wise. It carries a gear, 4, forming connections between thedifferent gears on the two shafts, 1 and 2, so as to producethe different speeds. The laleli with plunger below the handlelocks the handle vertically and the knob pin horizontally, allas shown diagrammatically in Pig. 60. The holes for locking in the index plate are drilled to suitthe correct positions of the intermediate gear in mesh with tht>cone gears. No engagement can lie made unless the inter-mediate gear is in the correct position. Though the entiremomentum from rest to the different speeds does not thusrequire to be overcome, as the variable speed shaft runs alwaysat the lowest speed, the shock from low to high speeds provedto be still too great and a frlctional connection between thedrill shaft and variator had to be introduced. This friction issimilar t
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
