US392351A - Balanced valve - Google Patents

Description

(No Model.) 2 Sheets-Sheet 1. J. T. LEE.

BALANCED VALVE. No. 392,351. Patented Nov. 6, 1888.

WITNESSES: INV'ENTOR:

M; I BY u V ATTORNEYS.

N. PETERS. PhalmLKhngnpher. Washinglun. n. C.

(No Model.) 2 Sheets-Sheet 2.

J. T. LEE.

I BALANCED VALVE. No. 392,351. Patented Nov. 6, 1888.

WITNESSES INVENTOR W l i x ATTORNEYS.

N. mzns. Pholoiilhographer. Washinmnn, n c.

rFIcE.

P TENT JULIUS THOMAS. LEE, OF MATTOON, ILLINOIS.

BALANC ED VALVE.

SPECIFICATION forming'part of Letters Patent No. 392,351, dated November 6, 1888.

Application filed March 1, 1888. Serial No. 265,818. (No model.)

You whom it may concern.-

Be it known that I, JULIUs THOMAS LEE,

of Mattoon, in the county of (loles and State of Illinois, have invented a new and Improved Balanced Valve, of which the following is a full, clear, and exact description.

The object of the invention is to' provide a new and improved balanced valve for steamengines, whereby the valve travels lightly on its seat, thereby preventing a considerable amount of friction and wear of the valve, at the same time keeping the valve true and even, so that the engine is capable of working to the fullest advantage at all times.

The invention consists of an adjustable table or track held in the steam-chest and a roller-frame provided with rollers traveling on the said table and supporting the slide-valve.

The invention also consists of certain parts and details and combinations of the same, as will be fully described hereinafter, and then I pointed out in the claims.

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 l isa longitudinal sectional elevation of the improvement as applied. Fig. 2 is an enlarged sectional plan view of the same on the line a: m of Fig. 1. Fig. 3 is an enlarged transverse sectional elevation of the improvement on the line 3 11 of Fig. 1, and Fig. 4 is a like view of the same on the line a z of Fig. 1.

The steam-cylinder A,of any approved construction, supports a steam-chest, B, in which is held to slide the slide-valve O, traveling over the ports of the cylinder A and provided with a valve-rod, D, connected in the usual manner with suitable mechanism on the engine for impartinga sliding motion to the said valve 0. On the front and rear sides of the top of the slide-valve O are placed the longitudinal plates E, supporting a cover, F, fastened by bolts G to thesaid longitudinal plates E, said bolts G also fastening the longitudinal plates E to the slide-valve O.

The cover F is provided in its middle with a strengthening-rib, F, and the under side of the said cover is supported on a number of rollers, H, each provided at its ends with trunnions H, mounted to rotate in suitable bearings formed in the roller-frame I, prefer ably made of two U shaped parts, of which the ends I overlap each other and are secured together by bolts 1, as is plainly shown in Fig. 2. Each roller H is provided with a number of reduced parts,H placed alternately between the enlarged rollers H as is plainly shown in Figs. 2 and 3. The enlarged part forms flanges which guide the rollers on the tracks. The reduced parts H of the rollers H travel on the longitudinal strips or tracks J, fastened on the top of a table, K, extending the length of the steam-chest B, but not reaching quite to either side of the steam-chest, so as to leave a steamspace between the sides of the steam-chest and the two corresponding sides of the table K. The said table K is supported by a number of springs, L, each coiled on a vertical rod, N, the lower end of which rests on the cylinder A, while its upper end passes through a suitable aperture formed in the said table K. The upper end of each spring L rests on the under side of the table K and the lower end of each spring L rests on a collar, N, secured to the rodN. The table K can be adjusted up or down in the steam-chest B by the screw-rods O, which pass through suitable apertures in the table K and screw at their lower ends into the cylinder A. Said screw-rods 0 pass through the cover B of the steam-chest B, and on the outer threaded ends of each screw-rod screws a nut, P, which is conical at its lower end and which fits into a corresponding conical aperture formed in the top of the cover B. On each screw-rod O is secured a collar, 0, which rests on the top of the table K, so that when the screw-rods O are screwed up and down said collars 0' either press the table K downward or permit an upward movement of the same by the action of the springs L pressing upward.

At each end of the steam-chest'B are secured two or more springs, Q, adapted to be engaged by lugs 1 projecting from each end of the roller-frame I, as is plainly shown in Fig. 2. In the table K, between the strips or tracks J, are formed a series of apertures, K, so as to permit the steam to pass from the lower part of the steam-chest to the upper, and vice versa, and also to permit the oil from the oilcup R to pass on the seat of the slide-valve C.

The operation is as follows: The slide-valve 0 receives a sliding motion in the usual man nor from the mechanism connected with the valve-rod D. The cover F, being secured to the slide-valve O and resting on the rollers II, supports the slide-valve on its seat, so that no pressure exists between the face of the slide valve and its seat on the cylinder A, and the table K is adjusted up or down accordingly by the screw-rods O, as above described, so that the wear that takes place on the slide-valve O can be taken up by the bolts 0, which adjust the table K lower down, and thus lower the slidc-valve G. The latter in its forward and-backward motion travels with its cover F on the rollers II, whereby thci'riction usually encountered in slide-valves as at present constructed is reduced to a minimum. The rollers II, having the reduced portions H, traveling on the strips or tracks J, also have very little friction, and the steam entering the steam-chest B can easily pass to all parts of the steanrchcst I5, either at the sides of the table K or through the apertures K in the same.

In case the roller-frame I gets out of place or to one side of the central line, the lugs I on the forward and backward motion of the slidevalve 0 will strike the springs Q, thus keeping the rollers II directly under the center of the cover 1?. \Vhcn the rollers II and the roller-frame I are in place and the valve 0 0p crates at full stroke, thelugs I will just touch the respective springs Q at the ends of the steam-chest B on the forward and backward movement of the said valve.

It will be seen that when the steam is turned oil and the valve put on long stroke, as is frequently done in locomotive-engines, the rollers II and their frame I adjust themselves to the center line at once, and hence they cannot get out of place or cause friction.

It will be obvious that my improvement is equally applicable to stationary and locomotive engines.

Having thus fully described my invention, I claim as new and desire to secure by Letters Patent- 1. In a roller-valve, the combination, with a table held in a steanrchcst and provided a table provided with longitudinal strips or tracks, of springs supporting the under side of said table, vertical rods on which said springs are coiled, said rods also guiding said table, screw-rods screwing into the cylinder and passing through the steam-chest cover and through the said table, nuts screwing on the outer ends of the said screw-rods, and a collar formed on each screw-rod and resting on top of the said table, substantially as shown and described.

3. In a roller-valve, the combination, with a cylinder and steam-eh est, of a table provided with longitudinal strips or tracks, springs on which said table rests, a screw-rod screwing in the cylinder and passing through the said table and the steam-chest cover, a collar formed on each. screw-rod and resting on top of the said table, and a nut having a conical bottom and screwing on the outer end of the said screw-rod, substantially as shown and described.

1-. In a rollcr-valve, the combination, with a steam-chest, of a table held adjustably in the said steam-chest and provided with longitudinal strips or tracks, rollers traveling on the said table, a frame in which the said rollers are mounted, said frame being provided with lugs at each end, and springs held on the in side of the said steam-chest and against which operate said lugs on the roller-frame, substantially as shown and described.

5. In a roller-valve, the combination, with a cylinder and steam-chest, of a slide-valve traveling in the said steam-chest, a cover fast ened on the said slide-valve, rollers supporting the said cover, a frame in which the said rollers are mounted to turn, a table held adjustably in the said steam-chest and provided with longitudinal strips or tracks, and springs held on the said steam-chest and adapted to be engaged by lugs on the said roller-frame, substantiall y as shown and described.

J. THOMAS LEE.

Witnesses:

S. RICHMOND, (3. E. WILsoN.

ICO

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