. Railway age gazette . j. The position of the valve 7 is con-trolled for speed by centrifugal force, and for pressure by apressure cylinder, similar to the regular speed and pressuregovernor. An increase in the speed or air pressure graduallycloses the valve 7, causing the oil pressure in the pipes S torise. This increase of oil pressure raises the plunger p againstthe weight is, changing the position of the link 13 from posi-tion A, in the direction as shown by position B, thus reducingthe point of cutoff. When the air pressure drops, the valve 7opens, reducing the oil pressure in the cylind
. Railway age gazette . j. The position of the valve 7 is con-trolled for speed by centrifugal force, and for pressure by apressure cylinder, similar to the regular speed and pressuregovernor. An increase in the speed or air pressure graduallycloses the valve 7, causing the oil pressure in the pipes S torise. This increase of oil pressure raises the plunger p againstthe weight is, changing the position of the link 13 from posi-tion A, in the direction as shown by position B, thus reducingthe point of cutoff. When the air pressure drops, the valve 7opens, reducing the oil pressure in the cylinder lO, allowing theweight IS to drop and increase the point of cut-off in the directionas indicated by A. Valve // is for adjusting the amount of oilopening for the maximum speed of the machine. VARIABLE SPEED AND REVERSINGATTACHMENT An attachment for drill presses which provides three speedsand a reverse for the drill without change in the adjustment oftlie drill press, is shown in the accompanying illustration. These. Variable Speed and Reversing Attachment for Drilling changes of speed or reversing are made without stopping themachine and provide for the convenient use of different sizes ofdrills and taps in the same hole or in the same vicinity. Thisattachment is carefullv built of high grade materials. There 210 RAILWAY AGE GAZETTE, MECHANICAL EDITION Vol. No. 4 are no sliding gears and the transmission is effected by twohardened and positive-acting ckitches. All the gears are ofhardened steel and the loose gears run on phosphor-bronze bush-ings. The direct speed is the same as the spindle speed, theintermediate speed is about two and one-half times faster thanthe direct and the high speed is about five times faster. This attachment, as ordinarily furnished, includes a Wizardchuck which permits the changing of all sizes and kinds of toolswithout stopping the machine, but it can also be obtained witha No. 3 Morse taper hole or a stub arbor so that any otherstyle of chuck ca
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroa, bookyear1913
