. American engineer and railroad journal . 42 X 42 PL.^NER WITH VARI.\BLE SPKED MOTOR TOP VIEW OF SPEED V.\RIATOR SHOWING BELT SHIFTING DEVICE, belt forks are moved alternately along guide rods bymeans of a pair of cylindrical cams, which revolve alter-nately through the medium of a set of intermittent gears oper-ated by the hand wheel shown at the rear. One revolution otthis wheel shifts the belt from one step to another and a shotpin indicates the complete revolution. The cam rolls have spiralslots milled in their peripheries, each belt fork being moved of the belt is controlled by t
. American engineer and railroad journal . 42 X 42 PL.^NER WITH VARI.\BLE SPKED MOTOR TOP VIEW OF SPEED V.\RIATOR SHOWING BELT SHIFTING DEVICE, belt forks are moved alternately along guide rods bymeans of a pair of cylindrical cams, which revolve alter-nately through the medium of a set of intermittent gears oper-ated by the hand wheel shown at the rear. One revolution otthis wheel shifts the belt from one step to another and a shotpin indicates the complete revolution. The cam rolls have spiralslots milled in their peripheries, each belt fork being moved of the belt is controlled by the vertical lever, shown at the rear,operating in a radial slot. This lever is of convenient heightand, through link connections, operates a pair of bell crankswhich serve as levers to slide the driven cone towards the driver,thus slackening the belt. This feature, together with the me-chanical belt shifting device and the fact that the steps of thepulleys are beveled on the edge, so as to offer no resistance tothe passage of the belt, permits of easily mak-ing rapid changes of speed, eve
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
