US438034A - Le roy tobey - Google Patents

Description

UNITED TATES ATENT FFIcE.

LE ROY TOBEY, OF PENN YAN, NEW YORK, ASSIGNOR TO HIMSELF AND GEORGE S. SHEPPARD, OF SAME PLACE.

ENGINE.

SPECIFICATION forming part of Letters Patent No. 438,034, dated October '7, 1890.

Application filed December 18 1889. Serial No. 334,189. (No model.)

To all whom it may concern:

Be it known that I, LE ROY TOBEY, of Penn Yan, in the county of Yates and State of New York, have invented a new and Improved Engine, of which the following is a full, clear, and exact description.

The invention relates to that class of engines known as three-cylinder engines, and its object is to provide a new and improved engine which is simple and durable in construction,very efiective in operation, and can be easily and quickly reversed whenever desired.

The invention consists in the construction of the rotary valves and the particular construction and combination of parts, whereby a continuous rotary motion is imparted to the valves while they are being shifted for reversing the engine, as hereinafter described.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar letters of reference indicate corresponding parts in all the figures.

Figure 1 is a longitudinal sectional elevation of the improvement. Fig. 2 is an end elevation of the same with part broken out. Fig. 3 is a transverse section of the same on the line m as of Fig. 1. Fig. l is a transverse section of part of the reversing mechanism on the line y 3 of Fig. 1; and Figs. 5, 6, and 7 are transverse sections of the valves, showing their relative positions.

The improved engine is provided with a suitably-constructed closed casing A, in the lower part of which is mounted to turn in suitable bearings a main driving-shaft B, having three crank-arms G, O, and 0 respectively, extending at angles of about one hundred and twenty degrees in relation to each other, as is plainly shown in Fig. 3. The crank-arms O, O, and O are inside of the casing A, and are connected by the pitmen D, D, and D respectively, with the pistons E, E, and E respectively, mounted to slide in the cylinders F, F, and F respectively, open at both ends, and secured at their upper ends to the under side of the steam-chest G, secured on top of the casing A.

In the steam-chest G are arranged the valveseats H, H, and H provided with the ports 11 ,11", and H respectively, connecting the interior of the steam-chest Gwith the upper open ends of the cylinders F, F, and F respect ively. On top of the valve-seats H, H, and H are mounted to turn the valves I, I, and 1 respectively, all three being secured on a longitudinally-extending shaft J, mounted to turn in suitable bearings in the steam-chest G and extending at one end to theoutside of the steam-chest, as is plainly shown in Figs. 1 and 2; Each of the valves I, I, and I is made in the form of a cylinder, and has in its periphery a longitudinally-extending groove 1 I, or 1 respectively, preferably of the same length as the valve-seat H, H, or H respectively, but somewhat longer and Wider than the respective ports H H or 1-1 in the valve-seat H. About one-half of each valve extends above its respective valve-seat, so' that when the shaft J is rotated the grooves 1 ,1 and I of the several valves are alternately exposed to the inside of the steam-chest, and then pass onto the respective valve-seats, so that the motive agent from the steam-chest G can only pass through the ends of the grooves I I and I to pass into the ports H H and H respectively, leading to the cylinders F and D respectively. It is understood that the longitudinal grooves in the several valves I, I, and I are placed in the same relative position as the crank-arms O, O, and C previously mentioned, so that when the first valve I takes steam, as shown in Fig. 5, the groove I of the second valve is uncovered on the outside of its seat H, and the other groove 1 of the third valve I is also uncovered and on the rear side of its respective valve-seat H The motive agent enters the steam-chest G through the usual inlet-opening G, and the motive agent is exhausted from the cylinders F F F when the respective pistons E, E, and E are in their lowermost position, so as to uncover openings F arranged in the Walls of the cylinders F, F, and F respectively, as is plainly shown in Fig. 1. The exhaust is thus discharged from the cylinders F F F into the casing A, and passed from the latter through an exhaust-pipe A to the outside.

A reversing mechanism is connected with the valve-shaft J and is provided with a sleeve K, having a diagonal groove K, engaged by a pin J, secured on the shaft J, as is plainly shown in Figs. 1 and 4, the outer end of the sleeve K being provided with an annular groove K engaged by pins L, projecting from a forked shifting-lever L, which when moved slides the sleeve K on the shaft J and turns the latter by the pin J of the said shaft engaging the diagonal or spiral groove K of the said sleeve.

On the sleeve K is held to turn and to slide a gear-wheel N in mesh. with a gear-Wheel O, A

The operation is as follows: When a motive agent is admitted to the steam-chest G, it passes alternately through the several cylinders F, F, and F by means of the valves I, I and I respectively, when the latter are alternately in such aposition that their respective grooves 1 ,1 and I are over the openings H H, and H respectively, in the val ve-seats H, H, and H so that the motive agent can pass from the ends of each valve through the grooves 1 I, and I into the openings H H and H to the upper ends of the cylinders F, F, and F The pressure exerted by the motive agent against the respective pistons E, E, and E forces the same downward, the motive agent being cutoff at or about two-thirds of the downward stroke. \Vhen the pistons E, E, and E are nearly in their lowermost position, then the upper ends of the said pistons uncover the exhaust-openings F of the respective cylinders F, F, and F so as to exhaust into the casing A, from which the exhaust can pass to the outside by the exhaustpipe A. It is understood that thelower part of the casing A is usually filled with oil or other suitable lubricant. When the operator desires to reverse the engine, he shifts, by means of the lever L, the sleeve K, so that the shaft J is rotated, and the position of the grooves 1 I, and l of the valves I, I, and I is changed to first admit steam alternately to the cylinders F, F, and F, thus reversing the motion of the engine. Thus it will be seen that the engine is very simple and durable in construction,effectively transmits the force of the motive power to the main driving-shaft, and also permits of reversing whenever desired.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

In a three-cylinder engine, the combination,

with the three-crank drivingshaft, the pis- LE ROY TOBEY.

Witnesses:

WM. T. MORRIS, O. V. BUsH.

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