. The railroad and engineering journal . Fig. 187. and when the .bushing is worn out it can be removed anda new one put in its place. Question 312. How is metal packing for piston rods and valvestems made ? Answer. A number of different kinds of metal packing arenow used. One of these kinds, made by the United StatesMetallic Packing Company, of Philadelphia, is illustrated by It consists of a cap, 1 i, which is bolted over the stuffing-box. The latter contains a number of metal rings, in which thepiston-rod B works. These rings are made as follows : 3 3 isa solid ring made of brass, w
. The railroad and engineering journal . Fig. 187. and when the .bushing is worn out it can be removed anda new one put in its place. Question 312. How is metal packing for piston rods and valvestems made ? Answer. A number of different kinds of metal packing arenow used. One of these kinds, made by the United StatesMetallic Packing Company, of Philadelphia, is illustrated by It consists of a cap, 1 i, which is bolted over the stuffing-box. The latter contains a number of metal rings, in which thepiston-rod B works. These rings are made as follows : 3 3 isa solid ring made of brass, with a spherical surface on one sidewhich bears against the cap i i, and a flat surface on the otherside. A solid cast-iron ring, 4 4, bears against the flat surface. according to the direction the piston is moving. This pressurewould bend the piston-rod if no provision were made to pre-vent it. For this reason the end of the piston-rod is attachedto what is called a cross-head, M, figs. 177. 17S, and 181, whichworks in guides, N N, N N, called guide-bars. Question 314. What are the different forms tf cross-headsand guides that are used? Answer. The cross-head shown in figs. 177, 17S. and 181 isthe one which is generally used on passenger engines. Thecross head is made of cast iron, and has slides, m in, fig. iSi,one on each side, which work between pairs of guide-bars, !^ A ,shown in section in fig. 181. These guide-bars are planed andfinished with great accuracy, so as to be straight and smooth, Vol. LXII, No. 6.] ENGINEERING JOURNAL. 275
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Keywords: ., bookcentury1800, bookdecade1880, bookidrailroadengi, bookyear1887
