Modern Steam Practice, Engineering and Electricity Volume 4; A Guide to Approved Methods of Construction and the Principles Relating Thereto, with Examples, Practical Rules, and Formulae (Paperback)

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1883 Excerpt: ...g causing the cams B and C and the disc G to slide in the contrary direction, or toward the left hand, which brings the various parts into the position Fig. 36; and so arrests the motion of the hammer by the action of the disc G. Upon the shaft A are two collars e S, which fit into recesses formed in the bosses of the cams B C, and act as air pistons to check the momentum of the cams when sliding on the shaft for the purpose of putting the hammer in or out of gear; there is also an arrangement, shown in Fig. 36, for preventing the roller H from being forced out of the plane of the inclined camsgg' while acting upon them. The distance to which the hammer is raised or depressed, and consequently the force of the blow, is controlled and regulated as follows. The connection between the rocking lever D and hammer F is formed by means of the lever J, which is circular in cross section; and this lever slides freely through the pin j, in the upper part of the piston p. One end of the lever J is connected to the rocking lever D by the connecting rod K, and the opposite end is pivoted on a movable fulcrum on the hanging arm L, which is fixed to a sector shaft / carried by the main framing; and according as this fulcrum is moved to the right or left hand, relative to the connecting pin j, a greater or less movement will be given to the hammer F. To control the movement of this fulcrum, a forked lever M is connected by a series of shafts and levers to a clutch m on the shaft A; the clutch being so connected to the shaft as to revolve with it, and at the same time being free to slide upon it. The clutch m is situate between two bevel wheels n -', mounted loosely on A, each of these wheels being formed with a clutch on its surface. The wheels n n' both gear with a p...