US278451A - Valve-gear for steam-engines - Google Patents

Description

(No Model.) 2 Sh eetsSheet 1. E. O'NEILL.

VALVE GEAR FOR STEAMENGINEK No. 278,451 Patented May 29,1883.

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E. ONEILL.

VALVE GEAR FOR STEAM ENGINES.

Patented May 29,1883.

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i the exhaust-valve and UNITED STATES PATENT OFFICE, I

EUGENE ONEILL, OF SAN FRANCISCO, CALIFORNIA.

VALVE-G EAR FOR STEAM-ENGINES.

SlPEGIFICATION, forming part of Letters Patent No. 278,451, dated May 29, 1883.

- l Application filed February 27, 1883. (No model.)

To all whom it may concern:

Be it known that I, EUGENE ONEILL, of

the. cityand county of San Francisco, State of California, have invented an Improved Valve- Gearfor Engines; and I hereby declare the following to be a full, clear, and exact description thereof.

1 My invention relatesto certain improvements in valve-gear for engines; and it consists, mainly, in a mechanism by which the eccentrics actuate the valves and in an im proved construction of the valves and their seats, and also in a means for connecting the exhaust-valve stems with the actuating-levers,

all of which will be more fully explained by reference to the accompanying drawings, in which- Figure 1 is a vertical section. 8 are side views.

My invention is shown in the present case as applied to an engine having a horizontal cylinder, A, with steam-valves B andexhaustvalvesB, the same being duplicated at the other end of the cylinder.

In my patent of May 25, 1880, the steam and the exhaust valves are both operated from above by suitable stems; but the stems of the exhaust-valves pass up through hollow sleeves, and their seats must be removed through the top, thus requiring considerable work when it is necessary to gain access to the exhaust-valves.

In my present invention each steamvalve B has a stem, 0, passing up through the top of the steam-chest and connected with theactnating mechanism, as will be described hereinafter. The exhaust-valvesB have stems D, which pass downward through stuffing-boxes at the bottom, as shown.

E is a plate or cover for the front of the Figs. 2 and steam-chest E, and the opening caused by its removal is of a size sufficient, after the steamvalve is raised 'to its highest point, to admit its seat F, which may thus be introduced or removed without interfering with the steam -valves. The exhaustvalve seats F have sleeves or extensions Gr projecting downward from them and screwthreaded at their lower ends, so that the studing-boxes H may be screwed upon them, and thus draw them closely to their places, where they are firmly held. When they are to be after removing the seats may be removed through the dependently by its own eccentric I, these 89- centrics being secured to a horizontal shaft, J, which extends from the crankshaft to a point The steam-valves opposite the cylinder and parallel with it,-be-

ing driven by gearing from the crank-shaft. The eccentric rods K connect with the oscillatin g toes or lifters L, and these lift the levers M, to which the lower ends of the exhaust-valve stems are connected, thus opening and closing the exhaust-valves at the proper time. The encen trio-rods N connect with the rocking arms 0, which actuate the lifting-toes P, and these latterraise the levers Q, by which the steam-valves are opened. The steam-valve stems O are con nected with the slotted bars or frames R, with in which the oscillating tripping-blocks S are hung, and these blocks are actuated by the ec centrics T, and the links U, and rocking arms V, so as to determine the point at which steam shall be cut off. The levers Q have anti-frictional rollers W mounted upon them at the points beneath the blocks S, so that when the levers are lifted by the toes or lifters P these rollers lift the blocks S, and with them the valve-stem 0, so as to open the steam-valves and keep them open until the action of the out 01f eccentric and the governor upon the block turns it so that it drops from the roller and allows the valve to close. This cut-oft mechanism is fully described in my patent of January 30, 1883, No. 271,352 but my present improvement consists in the employment of the levers Q and the anti-friction rollers W in place of blocks, which were formerly used, and which would be liable to become clogged by this construction and the employment of independent eccentrics for each valve, with the short eccentric-rods, I am enabled to set each valve exactly without disturbing either of the others, and the short rods being less afl'ected, to lengthen or shorten them by heat and cold,

the adjustment of the valves remains correspondingly more perfect.

The levers M and Q by their length and weight insure the prompt closing of the valves dust. By

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cular faceswill roll slightly. within the blocks when released, and the rollers W relievethe blocks from dauger'of breakage. As the point where the valve-stems D connect with the levers M moves slightly in the arc of acircle, I prevent the side movement of the stem as follows: The lower end of the stem is secured to a yoke, a, within which the blocks 11 are fitted to slide slightly. These blocks have their-inner faces made concave to fit the enlarged circular faces 0 of the lever M, so that as the lever rises and falls about its fulcrum thesecirr' b, and the blocks slide a little within the yoke to compensate for the slight arc of a circle made by the movement of the lever about its fulcrum.

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

1. In an engine having the independent superposed steam and exhaust valves 13 B,

' the movable exhaust-valve seat F, with the sleeve or extension G, through which the valvestem may pass downward from the valve, and;

the stufling-box H, screwed upon the extension to" hold the valve-seat to its place, substan tially as herein described.

2. In an engine having the superposed steam and exhaust valves B'Bwithin the steamchest E, the valve-stems G andD, extending out through the top and bottom of the valvechest from their respective valves, in combination with the levers M and Q, the toes or lifters L and P, and the independent eccentric I for each valve and'dri'vi'ng-shaft J, substantially as herein described.

3. The steam valve rod O,connected with the slotted bar R, and the oscillating trippingblocks S of the cut-off mechanism, in combina tion with the lever Q, with the anti-friction roller W, the toe or lifter IE, and the eccentric and rocker-arm, substantially as herein described.

4. Thelever M, having the enlarged circular faces a, and the valve-stem D, with its yoke a, in combination with the blocks 1), fitting the faces a, and said lever Madapted to slide within the yoke, so as to prevent side movement of Y the valve-stem, substantially as herein described.

. In witness whereof I hereunto set my hand.

EUGENE ONEILL.

Witnesses:

JAMES DALY, J. H. BLOOD.

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