2 sheets-sheet 1. STEAM ENGINE, No. 251,144. Patented Dec. 20, 1881.

(No Model.) . . . . ' 2 sheets-sheet 2. W. W0N PITTLER. STEAM ENGINE, No. 251,144. Patented Dec. 20, 1881.

. UNITED STATES PATENT OFFICE. WILHELM VON PITTLER, OF LEIPSIC, GERMANY. STEAM - ENGINE. SPECIFICATION forming part of Letters P atent No. 251,144, dated December 20, 1881. Application filed April 18, 1881. (No model.) Patented in Germany February 12, 1881. To all whom it may concern: of the fire. A suitable casing, P, surrounds of Bethe it city known of Leipsic,that II, WILHELM in the German VON PITTLER, Empire, the outside of these pipes, and in said casing have invented new and useful Improvements the fire-door N is arranged. in Steam-Engines, of which the following is a In the center of the top plate, T, a very heavy specification. metal (preferably cast-steel) clhamber, A, is ar 55 My invention relates to steam-engines con ranged, extending some distance downward nected with the steam-generator and operated into the fire-chamber F, formed by the grate - by superheated high-pressure steam; and my bars E, pipes i, and top plate, T, as above de- - O invention consists in the construction of a fire scribed. Into this metal chamber A the steam chamber surrounded by a series of pipes and cylinder C, with its slide-valve K, but without ?? closed by a plate, to which a heavy-metal (cast any valve-case, is placed, the piston-rod pass steel) chamber is attached, extending down ing through a suitable stuffing-box in the cover ward into the fire-chamber. A small quantity of said chamber A, and connected with the of water is at each stroke of the engine injected moving parts of the engine, arranged upon the into the surrounding pipes by means of a suit top plate, T, in any suitable manner. 65 able pump, the discharge or supply valve of The engine is provided with a suitable feed which is regulated by a suitable governor. The pump, B, to supply the generator with water, thus-injected water is converted into steam in and the discharge-pipe.7 of said pump is pro 2 ? vided with a suitable regulating-valve, m, op these heated pipes, and passes then into the erated by a governor, R, attached to the engine. heavy-metal chamber, where it is converted The water to be converted into superheated into superheated steam before entering the stealmisinjected, by means of the pump B, into chamber.steam-cylinder, which latter is placed into said one of the tubes, i-say into i'-and circulates 25 In the accompanying drawings, Figurel rep. then as water and steam through the series of resents a vertical section of the steam-gener. pipes i, as above described, into the pipe i', 75 ator with engine attached. Fig.2 is a top view from where it passes through pipe b into the of the same, and Fig. 3 is an outside elevation. “red-hot” heated metal chamber A, to be con Similar letters represent similar parts. verted into superheated steam, surrounding 30 The steam-generator consists of a suitable the steam-cylinder C and slide-valve K, and base-plate or frame, E, supporting the grate, passing then above or below-the edge of said bars H, and a top plate, F, between which a cylinderslide-valve C, toK, operatein the usual its piston, manner, and intothrough the number of upright tubes, i, are arranged close its piston-rod the crank-shaft, in the usual man to each other and surrounding the grate-bars. Iner. The escape-steam passes through a suita 35 One tube is connected with the adjoining tube, ble pipe, G, connected with the exhaust of the topabove plate, and T,below by suitable the flanges cap-pieces, of the frame J, forming E and cylinder, into the atmosphere, or may be used to 85 a communication from one tube with the next heat the water to be injected into the generator. tube, so that the water from which the steam. The slide-valve K is operated in the usual . 4O. is to be generated will pass down one tube and manner by means of an eccentric on the driv upward in the next tube, then downward again ing-shaft, and the quantity of water to be in 90 in the adjoining tube and upward again in jected into the pipes i of the generator is reg the next, and so on. These cap-pieces J form ulated by means of the governor R, operating at the saine time slipjoints for the tubes, to al and regulating the valve m, so that the quan 45 low the same to expand and contract freely. tity of water injected shall be in proportion to These tubes are placed close to and around the der.the quantity of steam used in the steain-cylin 95 grate-bars H, except in the front, where suffi Iam aware that steam-boilers have been con cient space M is left for the arrangement of structed with pipes surrounding the fire-cham the necessary fire-door N, and are consequently ber, and which said pipes have been filled, either so surrounded on all sides by the flame and gases wholly or partially, with a regular and constant Ico 2 251,144 quantity of water to be converted into steam; plate, T, with heavy-metal chamber A, extend and I am likewise aware that the top of a steam- ling downward into the generator F, and pipe IS boiler has been constructed with a chamber b, in combination with the steam-cylinder C extending downward into the steam-space of and its slide-valve K, inclosed in said chamber the boiler, and in which said chamber the steam- | A, the feed-pump B, supply-valve m, and gov cylinder, with its appropriate slide-valve, has ernor R, the whole being constructed and ar- . . been placed, and therefore do not claim this ranged to operate substantially in the manner arrangement, broadly; but and for the purpose herein described. to Whatsecure I byclaim Letters as myFittentis' invention, and desire. . WILHELMr vr.VON PITTLER.R O The steam-generator F, consisting of a suita. . Witnesses: ble fireplace or grate-bars, H, surrounded by || OTTO PARK, . pipes i, communicating with each other, top - WILHELM ELZE.