Appleton's dictionary of machines, mechanics, engine-work, and engineering . .The valve-spindle I is prolonged upwards andattached to a small solid piston m, workingwithin a short cylinder M, bolted to the mainsteam cylinder D. A small portion of steam issupplied above the piston in, by a slender coppertube n, communicating with the steam valve-chest J; by this arrangement it will bo seenthat, unless counteracted by some superior force,the pressure of the steam upon the piston m willtend to keep the valve e constantly depressed,in which position the steam-port f is full counteracting
Appleton's dictionary of machines, mechanics, engine-work, and engineering . .The valve-spindle I is prolonged upwards andattached to a small solid piston m, workingwithin a short cylinder M, bolted to the mainsteam cylinder D. A small portion of steam issupplied above the piston in, by a slender coppertube n, communicating with the steam valve-chest J; by this arrangement it will bo seenthat, unless counteracted by some superior force,the pressure of the steam upon the piston m willtend to keep the valve e constantly depressed,in which position the steam-port f is full counteracting force is supplied by the actionof the hammer itself; for, by means of the tap-pet N, (which is bolted to the hammer-block,)coming into sliding contact, when the. latter israised, with the small friction-roller o, mounted on the end of a bent lever 00, the screwed rod 1,which is jointed to the opposite end of that lever, is depressed, and that motion being communicated tothe valve-spindle /, through the intervention of the oonnecting-rod Q and valve lever K, the ste mi-. HAMMER. valve e is raised, thus cutting off all further ingress of steam under the piston, and almost at the sameinstant permitting the escape of that which had served to raise the hammer. By this simple contri-vance the upward motion of the hammer is made the agent for its own control in that respect. By com-paring the relative positions of the parts referred to, as exhibited in Figs. 2244 and 2248, the nature ofthe motion above described will be at once most fully understood. To obviate the injurious effects 01the shock of the tappet N against the lever 0, a connection is provided at p, on a similar principle tothat formerly described in reference to the connection of the piston-rod and the hammer-block; and inorder to restrict the downward travel of the valve to the proper point, a check or buffer-box S is pro-vided, consisting of a small cylinder bolted firmly to the framing of the machine, within which a c
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Keywords: ., bookcentury1800, booksubjectmechanicalengineering, bookyear1861
