No. 91,239, PATENTED JUNE 15, 1869. W. LEHMANN. HOT AIR , 3 SBEES-SEEET .

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No, 91.239, PATENTED JUNE 15, 1869, W. LEHMANN, HOT AIR ENGINE, 3 SHEETS-SHEET 2.

No. 91,239, PATENTED JUNE 15, l869. W. LEHMANN, HOT AIR, ENGINE, 3 SHEETS-8HEET 3.

(lited States a tent ()ffice. WILHELM LEHMANN, OF NUREMBERG, GERMANY, ASSIGNOR TO HIMSELF AND STEHN & WULFING, OF NEW YORK CITY. Letters Potent No. 91,239, dated June 15, 1869.

IMPROVEMENT IN HOT-AER ENGINE. recor-armesear The schedule refered to in these Letters Patent and making part of the same.

--e-r---Yr-r To all whom it may concern: The cylinders A and D contain the displacing-cyl Be it known that I, WILHELM LEHMANN, of Nu inder G, that is made of sleet-lmetal, riveted firinly, renberg, Bavaria, ?eritany, have invented and made so as to be air-tight, and within it is a head, g, and, a new and useful Improvement in Caloric-; at the end next the K, is a head, g. and I do hereby declare the following to be a full, This G is fitted to slide freely, in brass or clear, and exact description of the said invention, ref. other guides, attached to the inside of the cylinder A, erence being had to the annexed drawing, making part as at , there being an air-passage between the cylin of this specification, wherein ders G and A. a. Figure 1 is a longitudinal section of said caloric-, The piston-rod d is connected to the heads g g, engine; and passes through a stuffing-box in the piston K, Figure 2 is a plan of the same; and and connects, by slings 22, with the crank H', on a Figure 3 is a front elevation. rock-shaft, 3, an arm, 4, from which connects, by the Similar letters denote the same parts. rod it, with the crank b, on crank M of the shaft 5 of The object of this invention is to protect the pack the fly-wheel S. ings and working-parts from injury by the , dust, The piston K is connected, by the links 6, to the and friction usual in hot-air engines, and that the crank-arms 7, on the rock-shaft 8, and, from the arm oil, or iubricating-material, can be used without being H, a link, u', connects to the crank M. chaired. A valve, V, is provided, that can be operated by In consequence of my peculiar construction, high the handle q, or by the governor N, to let air into the speed and increased power can be obtained in propor engine, or allow air to pass out, if neuessary. tion to the size of the engine. The governor N is of any usual character, and forms There is no unpleasant smell from the oil. The no part of this invention. of air employed is confined in the engine, and It will be understood, upon reference to fig. I, that but little inconvenience is experienced from these en the fly-wheel S, moving in the direction shown by the gines, even in warm weather. arrow, the displacement-cylinder G moves toward K, Any character of fuel may be employed. There is and that the piston R, for a short distance, moves fl no danger of explosions, aid the engine is simple in ward g. its construction, can be attended by an ordinary me The cranks H H are so placed that this movement chanic, and can be very easily kept in repair. takes place to expel the air from betweeng ald K, My invention consists in an air-heating vessel, or and send it into the hat, D. 'hat, with a closed end, placed in a and con There it is heated, and acts, by its expansion, nected with the engine-cylindler, in combination with against the end of G, to complete the stroke and a main pistol) and a displacement-cylinder, and a water carry the crank M. past its dead-point, so that both jacket surrounding the main cylinder. the K and cylinder G will be moving in the By this construction the air between the displace sene direction as the air expands. ment-cylinder and piston is forced into the space he The crank b, turning the centre before the crank tween the displacement-cylinder and hat. There it M, causes the distance betweeng and K to increase, is heated, and acts to move the displacement-cylinder. transferring the air from the hat D to the cylinder A, Then the further movement of the parts causes the where it is cooled, to produce a minus , that air to pass between the displacement-cylinder and causes a reaction on the parts moving the piston K the main cylinder, so that it is cooled and its bulk in the other direction, the crank M having by this lessened, allowing of the reverse movement of the time turned its dead-centre, and the operations are engine. repeated. In the drawing What I claim, and desire to secure by Letters Pat A is the main cylinder, to which is united, by the ent, is bolts s, the air-heating vessel D, the end of which is The air-heating cylinder, or “hat, D, the cylinder shaped somewhat like a hat, and is to be introduced A, with water-jacket W, in combination with the dis within any suitable furnace or heating-apparatus. placement-cyliuder G, pisten K, and connections to I have sliown a furnace, R. the fly-wheel shaft, substantially in the manner set The end-portion of this air-heating vessel D is re forth. movable, so as to be changed in case of being burned In testimony whereof, I have hereunto set my name, Ot. in presence of two subscribing wituesses, this 1st day Around the cylinder A is a water-jacket, W, with of February, A. D. 1869. an inlet at , and an escape-pipe, F. W. LEEMANN. These are to be connected with a reservoir, and the water should circulate through the jacket so as to be Witnesses: kept cool, and, where the body of water is sufficient PHILIP GEIssE, to diffuse the caloric, it will not be necessary to re NICOLL HALSEY. pleuish the same on account of becoming warm.