. American engineer . valve chamber. This saves all the time thatis spent in lining up the valve stem guide of the ordinary con-struction employed with the Walschaert valve gear when it isnecessary to take down the valve motion. This arrangement isself supporting, so that no bracing from the guides or any othersource than the cylinder is required. It permits the use of astraight design of combination lever without forks, which is con-nected to the valve stem crosshead by a pin passing through itswings, thus affording greater lateral stability than is obtained inother designs. Extended Piston R
. American engineer . valve chamber. This saves all the time thatis spent in lining up the valve stem guide of the ordinary con-struction employed with the Walschaert valve gear when it isnecessary to take down the valve motion. This arrangement isself supporting, so that no bracing from the guides or any othersource than the cylinder is required. It permits the use of astraight design of combination lever without forks, which is con-nected to the valve stem crosshead by a pin passing through itswings, thus affording greater lateral stability than is obtained inother designs. Extended Piston Rod Guide.—A design of guide for the ex-tended piston rod, which in view of the general adoption of thispractice on locomotives equipped with superheaters has a wideusefulness, is shown in one of the illustrations. This device,like the valve stem guide, is self-centering, and can be removedand replaced in position without lining up, and at the same timeexactly coincides with the longitudinal axis of the cylinder. It. The steam pipes here shown liaze sinee been changed to the improved type shown on page 8, Front End Arrangement of Locomotive No. 50,000. 10 AMERICAN ENGINEER. Vol. 86, No. 1. consists of a cast iron shoe fitted to the e.\tended end of the and the guide is so constructed that it may be bored out andpiston rods and composed of a cast steel body to which the faced off at one setting of the machine. The bearing surfacesshoe is firmly screwed by four bolts. The shoe slides on a guide of the shoe and guide are made radial to provide sufficient wear-
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroa, bookyear1912
