US623168A - Engine - Google Patents

Description

. Pat'e'ntad Apr. I8, I899. T. LITWILLEB. ENGINE (Application filed Mar. 26, 1897.

2 Shani-Sheet (No Model.)

No. 623,:681 Patented Apr. I8, I899. T. LITWILLER.

ENGINE.

(Applicatien filed Mar. 26, 1897.. (No Model.) 2 Sheets-Sheet 2.

Nr'rni) STATES PATENT OFFICE.

THOMAS LITIVILLER, OF TREMONT, ILLINOIS.

ENGINE.

SPECIFICATION forming part of Letters Patent No. 623,168, dated April 18, 1899.

Application filed March 26, 1897. Serial No. 629,456. (No model.) I

To all whont it may concern.-

Be it known that I, THOMAS L1Tw1LLnR,a citizen of the United States, residing at Tremont, in the county of Tazewell and State of Illinois, have invented certain new and useful Improvements in Engines; and I do hereby declare that the following is a full, clear, and exact description of the invention, which will enable others skilled in the art to which it appertains to make and use the same.

The object of the present invention is to provide an improved construction of balanced slide-valves by means of which a balance-valve is constructed that is well adapted for the purpose designed.

By means of the construction I employ in carrying out my invention both the combination of valves and the means for connecting and actuating the said valves are very simple and durable and are arranged and manipulated to utilize the motive agent to the greatest advantage and constructed to reduce the friction to a minimum.

The invention consists of certain parts and details and combinations of the same, as will hereinafter be described, and then 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 of the figures.

Figure 1 is a plan view of an engine and steam-chest. Fig. 2 is a horizontal section showing the interior of the cylinder and steam-chest and the relative position of the working parts. Fig. 3 is an elevation of the steam-chest with the front wall thereof removed. Fig. 4 is a section on the line X X of Fig. 3.

In the drawings Ihave shown and described myinvention as applied to a multiple-piston engine and will proceed to describe the working function of the same in connection with my balance-valve.

The bed-frame of the engine is as a whole indicated by M.

B is the steam-cylinder, containing the piston-heads N O P and suitably secured on the bed-frame, the ends of which are closed by the heads b N, secured thereto by set-screws or by other suitable means.

(I. b are steam-ports opening out of steamchest E. The steam is delivered to the cylinder from the steam-chest through the said ports a b and exhausts therefrom through the same ports.

The pistons in cylinder B are adapted to operate in the manner shown, and the said cylinder has its ports a 12 adapted to register alternately with the ports 0 d, formed in the main slide-valve D, mounted to slide in the steam-chest E. F is a valve-stem connected with the mechanism for imparting a reciprocating motion to the said valve, consisting of the pitman-bar F, pivoted to the rod and eccentrically carried and driven from shaft V, for imparting a reciprocating motion to said valve to alternately connect the portsc d with the ports a b, respectively.

c is an exhaust port, space,or openingin the valve D, and c is an exhaust port or opening cored into the steam-chestE between the ports a and b and adapted to communicate with the exhaust-port c, where it opens out through the bottom face of the main valve D. With in the steam-chest is located a second or cutofi valve H, seated on the main valve and consisting of a flat lower part and a central raised neck, having a chamber adapted to communicate with the exhaust c,where it opens out at a point in the top face of valve D, and this valve H is adapted to be reciprocated in the steam-chest in such a manneras to alternately open and close the ports 0 d in valve D, the

said valve H being adapted to reciprocate throughout the greater portion of its move ment in an opposite direction from the movement of the valve D". Said valve H is also adapted to have a one-fourth lead over the said valve to facilitate in the proper working of the combined valves and adapted to so operate in connection with ports a d thatas one port is opened to admit steam the other will be closed; but the exhaust-ports or one of them at a time will be opened a short time after its matching port has been closed.

H is a stem connected with valve H,which are two upright pins 1.; 7c, spaced just outside the end sections h, and 2' vi are leaf-springs, each having a depressed center engaged inside one of said pins and two bent ends hearing upon the outer face of its section h, whereby the four sections are held together. The sectional frame is held against the side wall of the steam-chest in such manner as to produce a practically steam-tight joint by means of other and similarlyconstructed spring at 0n.,whose bent ends bear against the lower edges of the side sections h and whose depressed centers rest one upon a lug m at one side of the neck and the other upon the valve-stem ll,which is secured to the valve. By forming the valves in the manner shown I am better able to produce a practically complete balanced valve. Of course some little steam may escape into the interior of the valve or into the exhaust-space provided in each, but not enough to in any way afiect the principle of working of the valve. In connection with the steam-chest I provide the stuffing-box n, which carries the stems F and H. The s! eam enters the steam-chest through the inlet-opening K in the top portion thereof.

As before mentioned, through the body of the main valve D is arranged the exhaust-port c,which also opens into the chamber in valve II and connects with the outlet c leading to the outside, it being understood that the steam passing into the steam-chest from the cylinder can pass through the exhaust-ports to the outside. The valves D and H are somewhat less in width than the steam-chest, and hence the valve way or seat is correspondingly less in width, but extends the entire length of the steam-chest, as plainly shown in the drawings.

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

l. In an engine, the combination with the cylinder, piston, steam-chest, and main valve therein having steam and exhaust ports; of the herein-described cut-off valve comprising a flat lower part and an upwardly-extending hollow rectangular neck of smaller contour, means for reciprocating both valves, pins in the lower part of the cut-off valve at opposite ends of and remote from the neck, a frame surrounding the latter and consisting of two end sections notched near their extremities and two side sections whose extremities fit said notches, expansive springs between said pins and the end sections for holding all sections engaged, and expansive springs between said lower part and side sections for holding the latter in contact with the wall of the steam-chest, substantially as described.

2. In an engine, the combination with the steam-chest, and the main valve therein having steam and exhaust ports; of a cut-01f valve comprising a flat lower part and an upwardlyextending rectangular neck of smaller contour, means for moving both valves, pins in the lower part of the cut-off valve at opposite ends of and remote from said neck, a frame surrounding the latter and consisting of two end sections notched in their inner faces near their extremities and two side sections whose extremities fit the notches, and a removable leaf-spring between each endsection and its adjacent pin, the spring having a depressed center bearing against said pin and bent ends contacting with the outer face of said section to hold its notches engaged with the extremities of the side sections, substantially as de scribed.

3. In an engine, the combination with a steam-chest having parallel cover and seat, and the main valve reciprocating therein and provided with steam and exhaust ports; of a cut-off valve reciprocating between the main valve and cover and comprising a flat lower part and an upwardly-extending rectangular neck, a lug at one end of the latter, a valvestem connected with the other end thereof, a frame surrounding the neck and consisting of two end sections and notches in their inner faces and two side sections whose extremities engage said notches, means for pressing the end sections inward, and leaf-springs having depressed centers resting on said lug and stem respectively and bent ends for holding the side sections in contact with the wall of the steam-chest, substantially as described.

at. In an engine, the combination with the cylinder, the usual steam-chest with its ports and having parallel cover and seat, and the main reciprocating slide-valve having two main ports and an interposed exhaust-port extending through its body; of a cut-off valve upon the main valve and beneath said cover, said valve having a flat lower portion and an upwardly-extending neck provided with a chamber adapted to register with said exhaust-port, a loose-jointed frame surrounding said neck and comprising four sections, two springs for holding said sections engaged with each other, and two other springs for holding certain sections in contact with the cover of the steam-chest and the bodies of the two valves in contact -with each other, all substantially as described.

In testimony whereof I affix my signature 1n presence of two witnesses.

THOMAS LITlVILLER.

Witnesses:

IV. V. TEFFT, OHAs. W. LA PORTE.

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