US121355A - Improvement in oscillating-engines - Google Patents

Description

THOMAS W.. GODWIN.

--lmprovement in OSciHatin-g Engines.

Patented Nov. 28,1871. 1

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THOMAS W GODW|N Improvement in Oscillating Engines, Y0. 121,355, Patented Nov. 28,1871-.

N F N UNITED STATES PATENT OFFICE.

THOMAS W. GODWIN, OF NORFOLK, VIRGINIA.

. IMPROVEMENT IN OSCILLATING-ENGINES.

Specification forming part of Letters Patent No. 121,355, dated November 28, 1871.

10 all whom it may concern:

Be it known that I, THOMAS W. GonwIN, of Norfolk, in the county of Norfolk, and in the State of Virginia, have invented a new and useful Improvement in Oscillating Steam-Engines; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawing making a part of this specification.

My invention relates to oscillating engines; and consists in a peculiar construction and arrangement of valves in connection with the piston-cylinder, as hereinafter more fully set forth.

Figure 1 represents a side elevation of my improved engine. Fig.2 is a plan of the same. Fig. 3 is a sectional view of the steamchest H. Fig. 4 is a plan of the same with the cover removed. Fig. 5 is a horizontal longitudinal section. Figs. 6 and 7 are views of the valve and stem. Figs. 8 and 9 are views of the interior of the steam-chest D, showing the steam-valve with two ports open in each figure in different positions of the cylinder. Fig. 9 is a vertical section of the steam-chest D and valve B. Fig. 10 is a rear view of the valve B, the openings on the face thereof being represented by dotted lines.

The steam-cylinder A, trunnions A A and steam-chest D are cast separately or in one piece, one end of the latter forming the valve-seat, in which are four ports, a a b b, for the ingress and egress of steam. The trunnions are made hollow, A being divided by a partition, so as to form two chambers or passages for steam, each communicating with the chamber 0, which is formed upon and opens into either end of the steam-cylinder A. This chamber 0 also has a partition across its center opposite to andagainst that in the trunnions. The valve 13 consists of four slotted arms projecting from a hub to the inner circumference of the steam-chest. The slots a a b b form the openings to correspond with the ports a a b 1). Attached to the rear of this valve is a hollow disk, 6, provided with shorter arms which project over the slots aforesaid, and are channeled so as to conduct the steam into or from said hollow disk which opens into the hollow valve-stem B extending through the cover of the steam-chest D, and communicating, by means of pipe E, with steam-chest H. Between the inside of the cover of the steamchest D and the chamber 0 is a metallic washer or ring, which is made to press the valve closely against its seat by means of set-screws, as shown in Fig. 9. The lever F attached to the stem serves to adjust the valve, and is held in position by the notches in the ends of the lugs i i.

The arrangements within the steam-chest H are clearly shown in Figs. 3 and 4. The horizontal partition or valve-seat is provided with openings m a 0, communicating, respectively, with pipes E, K, and G. The valve 70 is the ordinary slidevalve used in stationary engines, and has attached the arm Z operated by the lever I. The pipe L communicates with and conducts the steam from the boiler.

The operation is as follows: The steam is admitted through the pipe L, the valve 70 being in the position shown in Fig. 3, and is conducted through the opening m, pipe E, and valve-stem B into the slotted arms of the valve B, where (the cylinder and piston being in the position shown in Figs. 1 and 2) it finds the apertures a a in the arms opposite to the ports a a in the valve-seat, through both of which it passes, and, after traversing the right-hand passage of the trunnion and division of the chamber 0, enters the cylinder A through the opening at the rear end of said chamber. In performing its office upon the piston the cylinder is oscillated, producing a corresponding oscillation of the valveseat and its ports, which closes the openings at a, opens the ports a a into the steam-chest, and brings the ports I) b opposite the apertures b I), through which the steam is now conducted to the forward end of the cylinder A, and, acting upon the piston, causes the exhaust steam from the opposite end to enter the steam-chest through the port a a. Thus at each stroke of the piston the two apertures a a of the valve open and close alternately with those marked 1) b, while two of the ports a a b b alternate with the other two in communicating with said apertures and in opening into the steam-chest. The exhaust steam is conducted from the chest D through pipe K, trunnion A and pipe K back to steamchest H, passing up through opening a, under valve 7c, down through opening 0, and out through exhaust-pipe G. The engine may be reversed by changing the lever F from one lug to the other, or by taking hold of the lever I and drawing the rod b, which moves the valve Ia, whereby the opening a is uncovered, permitting the steam to pass directly into the pipe K, through trunnion A and pipe K to steam-chest D. The projecting arms of the valve B being, as before stated, so arranged that the apertures in two of them are opposite two of the ports while the other two face the solid surface of the seat, the latter in this case permit the two open ports to take steam for one end of the cylinder A, while the other two conduct the exhaust steam from the opposite end. It then passes through the valve-stem B and pipe E into the lower division of boX H, up through opening m, under the valve 7c, and out as before through opening 0 and exhaustpipe G.

I claim as my invention l. The valve B and oscillating seat, herein described, in combination with the steam-chest D, substantially as set forth.

l/Vitnessesz D. E. SoMEs, F. O. SoM s.

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