US7350A - Abbawerement oe several slide-valves ist the same steam-chest - Google Patents

Description

UNITED sTATEs PATENT orrrcn.

CYRUSA RICHARDSON, 0F WOBURN, MASSACHUSETTS.

ARRANGEMET 0F SEVERAL SLIDE-VALVES IN `'III-IE SAME STEAIVLCHEST.

Specification of Letters Patent No. 7,350, dated May 7, 1850.

To all whom t may concern:

Be it known that I, CYRUs RioHARDsoN, of the town of Woburn, in the county of Middlesex and State of Massachusetts, have invented a new and useful Improvement in Arranging Valves for Locomotives and other Engines, called Richardsons Improved Arrangement of Valves, which is described as follows, reference being had to the annexed drawings of the same making part of this specification.`

` Figure l is a plan of the valves, eccen trics, &c.,` the cap plate of the steam chest being removed in order to exhibit the interior of the steam chest. Fig. 2 is a vertical cross section on the line 0, o, of Fig. l, the cap plate being in its proper position. Fig. 3, is a longitudinal section on the line w, w, of Fig. l, the cap plate being in its place. Fig. 4 is a plan of the steam chest, the cap and valves H, I-I, being rqmoved in order to show the openings in the valve seat.

Similar letters in the several gures refer to like parts.

My improved arrangement consists in making two or more valve seats in the same steam chest, with a valve cup to each seat, one of which is made in the usual form, and is used when the engine has to draw its ordinary load, and the valve cups to the other seats are made of various lengths longer than is usual and are used when the engine has less than its ordinary load, and graduates the quantity of steam used as to apportion it in some measure according to theA load, and thus enables the engineer to economize, or reduce the quantity of fuel used to generate the steam. This is eit'ected by stopping the ingress of the steam into the cylinder when the cylinder is one third, one half, or partially lled with steam; and by this means the expansive force of the steam is gained.

In the drawing accompanying my application I have represented similar valve seats upon, and wavs through the sides of `a triangular bed plate, or prism, represented in the drawings at I, the valve cup H isintended to work a full stroke of steam and is arranged u on one side of the aforesaid triangular be plate, and is operated by the usual kind of machinery used for that purpose, such as eccentrics B, B eccentric hook rods C, C', vibrating lever beam E, rock` shaft D, valve rod F, F2, cam shaft M, and

lifting cams V, V, for disengaging the ec-v centric rods C, C', from the lever E, all of Lwhich may be made and operated in the usual manner to change orstop the motion of the valve cup.

The valve cup H is intended to work a is effected by making the sweep of the y eccentrics B2 twice as long as the eccentrics B, B, so that when the piston arrives at the center of the cylinder the valve closes and shuts or cuts olf the steam upon that side of the piston until the next stroke. The valve I-I is connected to the eccentric B2 by the eccentric hook rod C2, lever E2 valve rod F2. The cam V2 is designed for disengaging the hook rod C2, and is operated in the usual manner.

The operation of the common slide valves in steam engines being so well known as to require no farther description, I shall therefore proceed to describe the operation or erates the valve H giving the piston half a stroke of steam. There may be several pins in the lever E2 at various distances from the center of the rock shaft to eifect a less stroke by diminishing the sweep of the beam. Where the amount of power required varies, I contemplate the use of steam chests with such a number of valve seats wit-h the requisite steam ways as may be necessary to eect the changes in the quantity of steamused, to suit the quantity of power required, the valves to be arranged upon a plane, or the portion of a cylinder, or upon angular elevations. I am aware (that two or more slide valves and valve seats have been used in the same `steam chest, as is the case when a cut ofi'. valve above the usual valve is employed.V I am also aware"VV and from the cylinder of a steam engine, ar-

ranged and operated to graduate the admissionofsteam into the cylinders ofsteam engines in the manner and for the purpose substantially as above set forth in the foregoing specification.

In testimony whereof I have hereunto signed my name before two subscribing witnesses.

CYRUS RICHARDSON.

Witnesses:

o JOHN B. BEERS,

JAMES M. RANDALL.

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