USRE5985E - Improvement in steam-engines - Google Patents

Description

F. LATTA.

Steam-Engines.

Reissued myza, 1814.

UNITED STATES PATENT OFFICE.

FINLEY LATTA, CINCINNATI, OHIO, ASSIGNOR TO JOHN B. WOOD AND RANDOLPH WOOD, OF PHILADELPHIA, PENNSYLVANIA.

IMPROVEMENT lN STEAM-ENGINES.

Speciiication forming part of Letters Patent No. 55,122, dated May 29, 1866; reissue Noi 5,985, dated July 28, 1874 application filed June 13, 1874.

To all whom it may concern:

Be it known that I, FINLEY LATTA, of Gincinnati, Hamilton county, Ohio, have invented certain n ew an d useful,Improvements in Steam- Engines, and I do hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accoming drawing making part of this specification.

My improvement relates to compound steanr engines, in which the exhaust steam from a high-pressure cylinderl is used, in an expanded form, in another cylinder before final eXhausp tion, and my invention consists of a valve-v motion, by means of which the valves of both cylinders are operated from one shaft.

In the accompanying drawing, Figure 1 is a perspective view of a compound engine with my improvements. Fig. 2 is a cross-section of the two cylinders.

The small cylinder A and the large cylinder B are arranged side by side, as closely as practicable. With this object in view I prefer to form both. cylinders, together with their steamports, in a single casting, as represented in the accompanying drawing'.

The small cylinder A receives steam from the boiler through a pipe, O, and exhausts into thc larger cylinder through passages D D', the cylinder B in its turn exhausting, through a pipe or passage, E, either into the open air or into a condenser, as may be preferred.

The valve-chests of the respective cylinders may be single, as at F, or double, as at Grv Gr'.

The cylinder A exhausts, by daring passages D D', into the valve-chests G G', which chests, together with their ports y g', are made of somewhat greater capacity than the corresponding parts of the cylinder A. The pistons of both cylinders are connected to a common crank-shaft,'H, whose cranks I l' point in diametrically-opposite directions.

The `crank-shaft H is provided with a single customary eccentric, J, which, being connected either to the direct wrist K or to the reverse wrist K' of a rock-shaft, L, serves to work at the same time both sets of valves, through the medium of suitable arms M M' and rods N N', of usual construction.

The described arrangement of valve-chests in juxtaposition also acts to economize material, space, and steam.

The inequality of effective area on the two sides ofthe common reciprocating piston, due

.to the space taken up by the rod, is in the above arrangement partly neutralized, because when the sole of one piston is in action the rod side ofthe otherI piston is in action.

By working the steam into the similar or corresponding end ofthe larger cy linder, and the piston in reversedirections, I am enabled to make one eccentric and one rocli-shaft serve for both sets of valves.

I claim herein as new and of my invention- The combination of two cylinders provided with pistons and valves, and a single rockshaft and reversing device, common to both valves, substantially as specified.

In testimony whereofI have signed my name to this speciication in the presence of two subscribin g witnesses.

FINLEY LATTA.

Witnesses:

J oHN' W; CARTER, H. G. H. TARE.

Images