US83941A - Improvement in rotary steam-engines - Google Patents

Description

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ALFRED DUVALL, OF BALTIMRE, MARYLAND.

Letters PatentvNo. 83,941, dated November 10, 1868;

To all whom it mez/y conce/rn Be it known that I, ALFRED DUVALL, of Baltimore, in thecounty of Baltimore, and State of Maryland, have invented a new and useful Improvement in Rotary- Pressure'Engines, to be operated by steam or any other fluid or liquid; and I do hereby declare that the following is a full, clear, and exact description ofthe construction and operation thereof', reference being had to the accompanying drawings, and letters of reference thereon, making a part of this specication, in which- Figure 1, plate 1, is a vertical cross-section.

Figure 2, plate 1, a longitudinal section ofthe springs, bar, and set-screws in the ends of the ellipse.

Figure 3, plate l, a cross-section ofthe same. Figure 4, plate 1, a cross-section of spring pressing against packing-rings.

Figure 5, plate l, a plan of same. Figure 6, plate 2, a longitudinalsection in elevation.

'l Figure 7 plate 3, a vertical cross-section, showing the engine with two valves.'

` To enable others skilled in mechanics to make and my invention, I will proceed to describe the constructionand operation o'f the same.

The character of my invention, as shown by the accompanying drawings, consists, first, in an elliptic piston, revolving within a cylinder of a true circle, equal in diameter to the length of the ellipse, with one or two, as desired, oscillating and nearly-balanced valves; also, the arrangement ofthe end Vpackin g-rings, and appliances for adjusting the same, and of weakening the 'points of the elliptic piston, by which they are made elastic, and arrangement for adjusting the same, so as tq compensate for wear; and also providing an oil or water-chamber in the ends of the same, and the combinationaas shown by the accompanying drawings, as will be more fully described in this specification.

Fig. 1, plate 1, shows an engine with but one valve, and receiving the agent of power at but one point.

Fig. 7, plate 3, shows an engine of a more efcient character, having two valves, and receiving the agent of-power at opposite points. When using two valves, the longer points of the valves, pressing on the face of the ellipse, are s'o prpportioned as to close the inletports at the time the exhaustA commences through the discharge-ports.

A is the shaft on which the revolving elliptic piston B is fastened. o

This piston is of an elliptical form, and has formed within the material composing its outer walls, and at the points of its greatest diameter, chambersD D, which serve as oil-chambers, and at the same time they serve to weaken the pistou at the points of its contact with the cylinder, so that by means ofthe set-screws H, bars Gr, and l springs F, the weakened or elastic portions may be set'out and brought into contact with the .interior surface of said cylinder. v

O is the stationary cylinder in which the elliptic pis- 'to'nrevolves u D D are oil-chambers in the endsof the elliptic piston.

.E E are oil-holes Afor charging the oil-chambers D.

J, gum packing between the packing-rings I and K.

L are conicalsprings, pressing against the packingrings K, as shown in figs. 4 and 5, plate 1, and fig. 6, plate 2.

M are set-screws, 'pressing against the springs L.

N are flange-rings, bolted to the flanges of the cylinder C, and through which the set-screws M work.

O are the stationary shafts, on which the valves P oscillate.

Q are the valve-chambers.

R R, recesses in the backs of the valves P, to be' iilled with Babbit metal.

S, recess in valve l), forming an oil-chamber.

T, oil-tube, supplying oil-chamber S.

U, inlet-pipe and port.

V, exhaust-pipe and port. g

W, journal-stands, supporting engine-shaft.

X, bed-plate.

Y Y, lily-wheels. I

For reversing, I use two engines of' the same class, on the same shaft, or connected by couplings, with the necessary stop-valves, Sto., so as to operate either engine alternately', thereby giving a reverse motion.

Opf/ration.

The steam or other agent of power, ,being let on through a' valve in the inlet-pipe, presses against the front of rthe valve P, which forms an abutment, and the front, or part of theY valve bearing on the elliptic piston,

is made a little longer than the back arm, by which means the valve is constantly kept tight to the face of the elliptic piston during its revolutions. The point of the ellipse being moved a little beyond the inlet-port, the agent of power' acts on the same, and'causes it to revolve in the direction indicated by the arrows, and, from the momentum ofthe iiy-wheels, a continuous rotary motion is maintained, and the power transmitted from the shaft of the engine as may be desired.

What I claim as my invention, and desire to 'secure by Letters Patent, is- 1. An elliptical piston, constructed with elastic or yielding surfaces upon its points of greatest diameter, substantlallyas shown and described.

2. The chambers D D, formed Within the piston, substantially as shown and described.

3. rlhe combination of the elliptical pistou B, the chambers D D, and the set-screw H, bars G, and springs F, substantially as shown and described.

4. The arrangement of the packing-rings K and I, rubber or elastic packing J, spring L, and set-screw' M, substantially as shown and described.

ALFRED DUVALL.

Witnesses:

SAMUEL Kann, A. LESLIE DUVALL.

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