. Appleton's dictionary of machines, mechanics, engine-work, and engineering. d in this piston are of a U-form, placed vertically, the strong side bearing upon thepiston, and the elastic side against the adjacent ends of two of tlte segments. The number of springsand segments is thus necessarily equal, ami so arranged that every segment is supported at each endby a spring. By this means the piston is made to work in (lie cylinder steam-tight, and to accommo-date itself to any slight variations due to the contraction and expansion of the materials ; and likewiseto compensate for wear of its own
. Appleton's dictionary of machines, mechanics, engine-work, and engineering. d in this piston are of a U-form, placed vertically, the strong side bearing upon thepiston, and the elastic side against the adjacent ends of two of tlte segments. The number of springsand segments is thus necessarily equal, ami so arranged that every segment is supported at each endby a spring. By this means the piston is made to work in (lie cylinder steam-tight, and to accommo-date itself to any slight variations due to the contraction and expansion of the materials ; and likewiseto compensate for wear of its own circumference and that of the II.—22 338 MARINE STEAM-ENGINE. The junk-ring is secured in its place by bolts and nuts; the nuts are placed in recesses providedfor them in the metal of the piston, and the bolts are screwed into them from the outside. The headsthus project on the surface of the ring, and would come into contact, at the end of the up-stroke, withthe cylinder cover, but for a circular recess formed in it for their reception, as before The piston-rod H is inserted into the piston through the eye in the centre, which is bored and taperedfrom the under side. The rod is of malleable iron, and turned, the body of it truly cylindrical, so thatat may work freely in the stuffing-box through which it ascends, and the lower end with the same taperas the eye into which it is fitted, and in which it is secured by a cotter-key traversing the metal of the MARINE STEAM-ENGWiE. 339 eye and the thickness of the rod thereby effectually binding the latter to the piston. For convenienceof inserting the key a recess is left in the upper plate of the piston, which is afterwards filled, to preventthe steam gaining admission to the hollow interior of the piston. Piston cross-head and connections.—The piston-rod, ascending through a packed stuffing-box, isinserted into an eye, bored a little smaller than its own diameter in the cross-head I, equidistantfrom the
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Keywords: ., bookcentury1800, booksubjectmechanicalengineering, bookyear1861
