US182183A - Improvement in steam-engines - Google Patents

Description

C. ERVIEN.

STEAM-ENGINE.

Patented Sept. 12, 1876.

N- PETERS, PHOTQ-L|THOGRAPHER, WASHINGTON, D CV UNITED STATES PATENT OFFICE.

CHARLES W. ERVIEN, OF PHILADELPHIA, PENNSYLVANIA.

IMPROVEMENT'IN STEAM-ENGINES.

Specitication forming part of Letters Patent No. 182,183, dated September 12, 1876; application led August 4,1816. y

Be it known that I, CHARLES W. ERvIEN,

0f Philadelphia, Pennsylvania, have invented an Improvement in Steam-Engines, of which the following is a spccication:

The object of my invention is toaiford facilities for starting a steam-engine when the valve or valves cover both steam-ports and exclude the steam from .the usual passages.

In the accompanying drawing, Figure l is a sectional view of part of a steam-cylinder with steam-chest and valve, and containing my improvement; Fig. 2, a sectional plan on the line 1 2, and Fig., 3 a moditicatiou of my invention.

Arepresents part of the cylinder of a steamengine, and B the steam-chest. In the present instance there is a duplex valve, D D', connected to the valve-spindle and adapted to the steamports a and exhaust-ports b in the usual manner.

When the engine has stopped at such a point that the valve covers both steam-ports,

.as shown in Fig. 1', the operation' ofthe valve by hand becomes necessary in starting an ordinary engine, and this is usually accomplished by throwing the end of the eccentric rod out ot' gear and manipulating a lever connected to the valve-spindle-operatious demanding costly appliances, which I dispense with by arranging within the steam -chest a supplementary valve-seat, Gr, having two ports, m m', the former communicating, through a passage, u, with the main steam-port at one end of the cylinder, and the other, through a passage, n', with the steam-port at the opposite end of the cylinder. To the valv'eseat G is adapted a small valve, H, attached to a spindle, I,'which passes through a stuffing- `box on the steam-chest.

r point that the main valve covers both steamports a a.

Instead of making long passages -n n', communicating with the steam-ports, and a single seat for a single supplementary valve, there may be within the chest two seats for a du plex supplementary valve, H H, adapted to ports m, communicatingthrough short passages with the main steam-ports.

l do not desire to claim, broadly, the use of a supplementary valve for introducing steam to the cylinder when both steam-ports are closed; nor do I restrict the application of my invention to a valve of the class shown, as it may be applied to different styles of valves; but Y I claim as my invention- The combination, with the steam-chest B and its main valve, of the supplementary valve seat or seats G, arranged within the chest, the ports m m', communicating with the main steam-passages, and the supplementary valve or valves H, all substantially as set forth. Y

In testimony whereof I have signed my name to this `specification in the presence of two subscribing witnesses.

CHARLES W. ERVIEN.

Witnesses:

HARRY HoWsoN, Jr.,

HARRY SMITH.

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