US474456A

US474456A - Steam-engine

Info

Publication number: US474456A
Authority: US
Publication date: 1892-05-10
Anticipated expiration: 1909-05-10

Description

(No Model.) 4 F. P. OGILV-IE. 1 STEAM ENGINE.

No. 474,456. Patented May 10,1892.

l I I A l I l l I I l I I l IL WITNESSES:

% m/ Zmgr 4 ATTORNEY.

tended for a traction-engine.

NITED STATES PATENT OFFICE.

FRANK P. OGILVIE, OF METROPOLIS CITY, ILLINOIS.

STEAM-ENGINE.

SPECIFICATION forming part of Letters Patent No. 474,456, dated May 10, 1892.

Application filed October 26, 1891. Serial No. 402,884. (No model.)

To all whom it may concern:

Be it known that I, FRANK P. OGILVIE, a citizen of the United States, residing at Metropolis City, in the county of Massac and State of Illinois, have invented certain new and useful Improvements in Steam-Engines; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to-which it appertains to make and use the same, reference being had to the accompanying drawings, and to the figures of reference marked thereon, which form a part of this-specification.

My invention consists in certain new and valuable improvements in steam engines, which will be hereinafter fully described and claimed.

Referring to the accompanying drawings, Figure 1 is aperspective view illustrating my invention. Fig. 2 is a sectional detail view taken on line a a of Fig. 1. Fig. 3 illustrates in detail the valvegearing.

The same numerals of reference indicate corresponding parts in all the figures.

Referring to the several parts by their designating numerals, 1 represents the boiler, the engine shown in the drawings being in At the side of the boiler is mounted, as shown, the steamcylinder 2, having the ports 3 3 4 and exhausting through the heater into the smokestack. The cross-head of the engine is connected by the pitman 5 with the wrist-pin 6 of a drive-wheel 7, secured on one end of the shaft 8, which is mounted in bearings transversely above that end of the boiler, while upon the other end of this shaft is secured a balance-wheel 9. At the side of the steamcylinder 2 is arranged the valve-chamber 10, the ports 3 3 4: opening through the inner wall of this chamber, as shown, and the passage of the steam through these ports is regulated by the cut-off valve 11. This valve is mounted at its upper end upon the squared inner end of a short rocking shaft 12, upon the pro jecting outer end of which is keyed or secured the slotted crank-bar 13. This bar is centrally secured upon the end of the rocking shaft and has formed in its fiat outer face a central longitudinal groove 14 and a series of holes or apertures 15, preferably three on each side of its center, as shown.

in which the edge of the cam 16 fits and revolves. The cam-rod is flattened near its other end and is there provided with a pin 21, arranged to lit in any one of the series of apertures 15 of the crank-bar 13. The Hattened end of the cam-rod passes under a guide-bail 22, secured at its ends in the ends of the crank-bar, and is normally held with its pin 21 resting in one of the apertures 15 by the tension of a spiral spring 23.

It will now be seen that as the transverse shaft 8 is revolved by the engine the cam 16 will be revolved with it, and as it turns in the casing 18 18 on the end of the cam-rod will reciprocate the said rod back and forth, and as the pin 21 at the other end of the camrod is fitted in one of the apertures 15 of the crank-bar 13 the said crank will be re=ciprocated, rocking the shaft 12, and thus reciprocating the valve 11 on the inner end of said shaft back and forth over the ports 3 3 and 4, as will be clearly-seen.

From the foregoing description, taken in connection with the accompanying drawings, the construction, operation, and advantages of my invention will be readily understood. It will be seen that the short-stroke cam (no cog-wheels or links being used to make the connection) reduces the amount of lost motion to the minimum, a great advantage in engines of high speed; secondly, in order to reverse the engine it is only necessary to pull the end of the cam-rod outward, releasing the pin 21 from the hole 15 in which it is resting, and slide it down to one of the holes on the other side of the center of the crank-bar l3; thirdly, the short motion of the rock-shaft and cut-off valve gives the engine high speed, and the speed of the engine can be increased or reduced by merely moving the cam-rod pin 21 to a hole 15 farther from or nearer to the center of the crank-bar, while by moving the pin to the center of the crank-bar the engine can be stopped. This short motion of the rock-shaft does not cut or wear out the packing as a long stroke.would.

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

1. In an engine, the combination, with the steam-cylinder having the ports 3 34, of the rocking shaft 12, having the valve 11 secured on its inner end, the crank-bar 13, cent-rally secured on the outer end of said shaft and formed with the series of apertures 15, the shaft 8, revolved by the engine and having the cam 16, and the cam-rod 17, having the pin 21 at its movable end, substantially as set forth.

2. In an engine, the combination, with the steam-cylinder having the ports 3 3 4, of the rease rocking shaft 12, having the valve 11 secured on its inner end, the crank-bar 13, centrally secured on the outer end of said shaft and formed with the series of apertures 15, the shaft 8, revolved by the engine and having the cam 16, the cam-rod 17, having at one end the grooved annular casing 18 18 and having at its other end the pin 21, and the spiral spring 23, arranged to hold the pm of the cam-rod in engagement with the apertured crank-bar, substantially as set forth.

In testimony whereof I affix my signature in presence of two Witnesses.

FRANK P. OGILVIE. Witnesses:

JOHN W. BELYEW, R. N. SMITH, Jr.