Appletons' cyclopaedia of applied mechanics: a dictionary of mechanical engineering and the mechanical arts . o give plenty of area, and the ends are left open for convenient access in case theanvil should settle and require readjustment. The Sellers Steam-Hammer.—In a single-acting steam-hammer the gross force of the blow struckis that due to the weight of the die or hammer, the piston-rod and piston, and the height from whichthey fall; the force of the blow being regulated by varying the length of the stroke, or, in other HAMMERS, STEAM, DIRECT-ACTING. 95 words, the height to which the hamme
Appletons' cyclopaedia of applied mechanics: a dictionary of mechanical engineering and the mechanical arts . o give plenty of area, and the ends are left open for convenient access in case theanvil should settle and require readjustment. The Sellers Steam-Hammer.—In a single-acting steam-hammer the gross force of the blow struckis that due to the weight of the die or hammer, the piston-rod and piston, and the height from whichthey fall; the force of the blow being regulated by varying the length of the stroke, or, in other HAMMERS, STEAM, DIRECT-ACTING. 95 words, the height to which the hammer is lifted by the steam. In many steam-hammers of modernconstruction the steam is admitted to both sides of the piston, so that the force of the steam uponthe upper side acts to increase the force of the blow, the latter being modified by regulating thepressure of the steam above the piston, and for very light blows by throttling the exhaust-steam be-low it, as well as regulating the stroke of the hammer. A double upright steam-hammer, by William Sellers & Co., is shown in Fig. 2285. The essential. peculiarities in the design of this hammer consist in making the hammer one long bar of wrought-iron, having the piston welded to and forming part thereof, and guiding this bar by the top andbottom cylinder-heads only, thus doing away with the usual side-guides in the hammer-frame, andleaving the entire space below the cylinder free for the use of the workman in handling his work,while the hammer-head and die are claimed to be guided more efficiently than in any other system,and the frames to be subjected to less strain. An improvement in the manner of attaching the die to the bar consists in employing a crimpedsteel key, which holds the die with an elastic pressure, and operates to prevent the bending or thefracture of the bar. Another improvement consists in obtaining the motion to work the steam-valvefrom two diametrically opposite grooves, operating a brass yoke whose line of
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Keywords: ., bookauthorbenjaminpark18491922, bookcentury1800, bookdecade1880
