Century Dictionary and Cyclopedia
- n. In steam-engines, a shaft that oscillates or rocks on its journals instead of revolving; specifically, a vibrating shaft with levers which works the slide-valves of some engines. This mode was generally adopted before the introduction of the direct-action mode of working them. Also rocker-shaft, rocking-shaft.
- n. In mining, a shaft constructed for sending down rock for filling stopes which have been worked out. It is usually provided with a valve or trap at the bottom so that rock may be thrown into it at any time and taken out as it is wanted.
“When the reversing lever, T, is thrown full to the right, as in Fig. 12, the pin, P, is drawn to the inner end of the slot in the arm, G, and is thus exactly in line with the rock-shaft, O.”
“Fig 11, is thrown full to the left, the pin in its upper end is exactly in line with the rock-shaft, O.”
“This journal turns freely in the outer end of a lever, M, which transmits the reciprocating motion to the valve, through the rock-shaft, O, and another lever, N.”
“The amount of travel on the rock-shaft is fixed by the design, but the proportionate travel above and below the horizontal is controlled by the length of the connecting-rods from the crank to the rock-shaft.”
“Then turn the machine slowly by hand until the pawls on one set of valves are at their highest point of travel, then with the valves wide open adjust the drive-rods, i.e., the rods extending from the crank to the rock-shaft, so that there is 1/32 of an inch clearance (shown dotted in Fig. 17, Chap. I) at the point of opening of the pawls when they are "in.”
“If it is noticed that the shield-plate shaft has any tendency to oscillate in unison with the rock-shaft which carries the pawls, it is a sure indication that the shield-plates are not as free as they should be, and should be attended to.”
“The valves, as can easily be seen, are very simple affairs, the steam pressure in the steam chest holding the valve either open or shut until it is moved by the pawl on the rock-shaft.”
“_ It communicates to the leg the semi-rotary or oscillating motion of the rock-shaft.”
“It may be attached to either end of the rock-shaft.”
“The action derived from the right end of the rock-shaft is much less severe than that from the left, on account of the shape of the rubber appendage, and at the beginning should be used in preference.”
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