US412693A

US412693A - James b

Info

Publication number: US412693A
Authority: US
Publication date: 1889-10-08
Anticipated expiration: 1906-10-08

Description

J. B. ALLFREE.

Pate nted Oct. 8, 1889.

No. 412,693. I

uililliun "Mimi" E Wm i UNITED STATES PATENT OFFICE.

ticularly described or pointed out,

.valve more sensitiveand more completely JAMES B. ALLFREE, or INDIANAPOLIS, INDIANA.

BALANCED SLIDE-VALVE.

SPEOIFIGATIO N forming part of Letters Patent No. 412,693, dated October 8, 1889.

Application filed April 3, 1889. Serial No. 305,844- (NomodeL) To all whom it may concern:

Be it known that 1, JAMES B. ALLFREE, a citizen of the United States, residing at Indianapolis, in the county of Marion and State of Indiana, have invented certain new and useful Improvements in Balanced Slide Valves; and I do hereby 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.

This invention relates to certain new and useful improvements in balanced slide-valves; and it consists, substantially, in such features of arrangement, construction, and combinations of parts as will hereinafter be more par- The invention is intended as an improvement upon the balanced slide-valve for which Letters Patent No. 280,993 were granted me on the 10th day of July, 1883; and it has for its object to render the valve adjustable, so that its contact with its-valve-seat may be easily regulated; to make the operation of the under control, being adjustable While the engine is in operation, and to permit of con struction' with greater accuracy and less cost, all as will more fully hereinafter appear, when taken in connection with the accompanying drawings, wherein Figure 1 represents a longitudinal side elevation of my improved balanced slide-valve, the same being partly in section to more clearly indicate the construction of parts. Fig. 2 is a transverse sectional view of the valve, together with the steam-chest in which the same slides. Fig. 3 is a view in detail representing the connection resorted to between the eccentric-rod of the engine and the valve-stem. I

, In the former patent referred to the two valves are held apart by springs, and the distance they can move apart is determined by a clamp at either end. These clamps are formed with ledges havingrectangular sides, which receive ledges or lugs on the ends of the valves, also rectangular, forming stops for the valves, and their construction is such that the extent of their movement apart cannot be adjusted or regulated. To enable the valves to do their work properly, these clamps must be neatly fitted by a skilled mechanic, 4

and there is no provision except by refitting, to take up any wear or to correct a bad fit In the present invention springs are employed in like manner tohold the valves apart; but the ledges. on the clamps have beveled or inclined sides, and the lugs on the ends of the valve which are received by said clamps are also beveled correspondingly, so that if the clamps are moved toward or from each otherthe distance the valves can move apart is increased or decreased in proportion to the distance the clamps are moved. The movement of the clamps necessary to adjust the valves is effected by rotating the valve-stem, which passes longitudinally between the valves, and may be squared at any part outside of the steam-chest, and which is provided with a right-handed screw at one end of the valves and a left-handed screw at the other end, which take into screw-threaded holes in the clamps provided for that purpose.

The valve-stem imparts reciprocal motion to the valves, and in order to prevent any i change of position of the clamps by this reciprocal motion, and also to insure the same regulation of either clamp when the valvestem is rotated, it is necessary to adapt the valve-stem to the valves in such a way as to permit its rotation. and to prevent its longitudinal motion with respect to the valves themselves, while the latter are held firmly on the stem and are free to move transversely (to or from the valve-seats) by the action of the steam and springs. This-is effected by placing on the valve-stem inside, between the valves, lock-nuts and washers, which are faced off and bear against facedofi portions of the valves squared and faced to receive them, and in this way also isprovision made to receive the thrust by which the valves are actuated. The spaces on the valve-stem where these nuts are located may be flattened or the threads removed on one or two sides of the stem. and the hole through the washer shaped to fit neatly thereon, for the purpose of preventing the washer from turning on the stem and loosening the nuts when said. stem is rotated.

the letters marked thereon, A represents the valves,- two in number, counterparts of each other, and each one seated before the ports in the steam-chest A. The said valves are maintained apart from each other by the steam-pressure when the engine is in operation and by means of the springs B, by the action of which they are free to move transversely or to and from the valve-seats, and to they are provided, as usual, with steam-ports.

(Designated by the letter C.)

The valves are provided with lugs a on their ends, the sides of which are beveled, as shown, and these lugs enter or are received I 5 under the ledges 1), formed on the adj ustingclamps D, and also having correspondinglybeveled sides. From this construction the distance the valves can move apart may be increased or decreased by simply turning the valve-stem E, which passes longitudinally between the valves, and which is provided at one end with a right-handed screw and at the other end with a lefthanded screw, which take into screw-threaded holes in the clamps, as shown, said clamps being lined with brass or other suitable material to prevent sticking from oxidization.

Located on the valve-stem, inside and between the valves, are washers L L and lock- 0 nuts M M, which, as before stated, serve to receive the thrust required to actuate the valves as they are reciprocated before the valve-seats by the stem,by virtue of their being squared and faced off and bearing against 5 faced-01f portions of the valves. The said nuts and washers prevent any change of position of the clamps apt to occur on the reciprocation of the valve-stem, as well as any longitudinal motion of said stem with respect to the valves when the same is rotated to move the clamps in or out.

By reference to Fig. 3 of the drawings the manner of connection between the valve-stem and the eccentric-rod will be seen. This c011- nection is constituted of a yoke R, to which the eccentric-rod S is connected, and which yoke is held by brackets s s, bolted to the engine-bed, as shown. The yoke has a projection t, through which thevalve-stem passes,

and a set-screw is provided to tighten against the stem, as shown. The end of the valvestem is screw-threaded, as explained and shown, and fitting thereon on either side of the projection 15 are the nuts T T and U,

which firmly hold said stem. Then it is desired to rotate the valve-stem, the nut U is loosened. The stem is then free to rotate without changing position longitudinally, as the two nuts T T are locked against each other, forming a collar. When it is desired to move the valve-stem longitudinally, then all the nuts are loosened and set as desired. The point of the valve-stem is made square, for the purpose of fitting a wrench with which to rotate the stem and also hold it in position while the nut U is being firmly set. The accidental turning of the valve-stem is of course prevented when the nutU is screwed tight against the nuts T T.

From the foregoing it will be seen that by the construction and arrangement of the several parts a uniform wear is had, as well as reliable action, and that the valves may be easily adjusted to suit varying requirements incident to their use and operation.

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

1. In balanced slide-valves, the combination, with the valve-stem, of the two valvesSo adapted to move to and from each other and provided on their ends with lugs or ledges having beveled sides, and two clamps correspondingly formed and adjustable on the stem, substantially as described.

2. In balanced slide-valves, the combination, with the valve-stem provided at one end with a right-handed screw and at the other end with a left-handed screw, of two valves held apart by springs and provided on their ends with lugs having beveled sides and two clamps screw-threaded to fit the ends of the valve-stem and formed with ledges fitting said lugs, substantially as described.

3. The combination, with the valve-stem, 5 the two valves adapted to move transversely with respect thereto, and means for increasing or decreasing the extent of such movement, of locknuts and washers placed on the valve-stem inside between the valves, .the same being faced off and bearing against faced-oif portions of the valves, which are squared and faced to receive them, substantially as described.

4. The combination, with the valve-stem, of two valves adapted to move transversely with respect thereto and form ed on their ends with the lugs or ledges having beveled sides, the two clamps correspondingly formed for adjustin g the valves, and lock-n uts and washers placed on the valve-stem inside between the valves, the same being faced off and bearing against faced-off portions of the valves, which are squared and faced to receive them, substantially as described.

5. In balanced slide-valves, the combination, with the valve-stem and eccentric-rod, of the yoke R, having projection it, through which the stem passes, and the nuts T T and U, fitting on said stem on either side of said projection, substantially as described.

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

JAMES B. ALLFREE.

Witnesses:

M. H. Esoorr, T. R. BELL.