US356958A - Cut-off for steam-engines - Google Patents

Description

(N0 Model.)- 2 Sheets-Sheet 1.

E. QUEROL. Y DELGADO. GUT-OFF EoE STEAM ENGINES.

No. 356,958. Patented Feb. 1', 1887.

ATTORNEYS.

N. PETERs Phoku'ljlhngnphcr. Wishinglun. D4 0.

UNITED STATES PATENT OFFICE.

EMILIo QUEROL Y DELGADO, OF BROOKLYN, NEW YORK.

CUT-OFF FOR STEAM-ENGINES.

SPECIFICATION forming part of Letters Patent No. 356,958, dated February 1, 1887.

Application filed September 1, 1886. Serial No.2llA1l. (No model.)

,GADO, of Brooklyn, in the county of Kings and. State of New York, have invented a new and Improved Automatic Out-0ft for Steam- Engines, of which the following is a specification, reference being had to the annexed drawings, forming a part thereof, in which Figure l is a side-elevation of a horizontal steam-engine to which my improved cut-off has been applied. Fig. 2 is an enlarged partial side elevation of the engine, showing the position of the parts of the cut-off when the steam is entirely shut oii" from the cylinder; and Fig. 3 is a vertical transverse section taken on line aw in Fig. 2, looking in the direction indicated by the arrows;

Similar letters of reference indicate corresponding parts inall the views.

The object of my invention is to construct a simple and eficient out off for steam engines, in which the stroke of the slide-valve will be varied in accordance with the load carried by the engine. l

My invention consists in the combination, with the slide-valve rod and eccentric-rod of a steam-engine, of a slotted valve-operating lever connectedwith the said rods, a movable fulcrum for the valve-lever, and a governor driven by the engine and arranged to move the fulcrum of the valve lever in accordance with the requirements of the engine.

It also consists in the combinatiomwith the movable fulcrum, of an index and scale forindicating the proportion of the strokeof the valve relative to its full stroke.

The enginecylinder A is mounted on the base B, and provided with a piston and piston-rod, which communicate motion to the main shaft 0 through the connecting-rod D and crank E in the usualway. The cylinder is provided with the valve-chest F, containing a slide-valve, G, of the ordinary construction, which is capable of opening and closing the ports a when moved by the mechanism presently to be described, so as to admit steam alternately to opposite ends of the cylinder.

' The slidevalve G is provided with the valverod b,which extends through the gland c in the end of the steam-chest F.

To the side of the engine-bed is secured a vertical guide, H, provided with the slot I to which is fitted a slide, J, carrying a stud, K.. In the L-shaped upper end of the guide H is journaled the vertical governor-shaft L, which extends below the bed of the engine, and is provided at its lower end with amiter-wheel, d, which receives motion from a miter-wheel, d, on the shaft M, journaled in the lower part of the'base B.

The shaft M is provided with a pulley, O, which receives motion through a belt. 0, from a pulley, N, on the main shaft 0. The upper end of the governor-shaft L carries a crosshead, P, to opposite ends ofwhich are pivoted the weighted levers Q.

On the shaft L, between the cross-head P and the guide H, is placed a sliding circumferentiallygrooved sleeve, R. provided with earsf on its upper end. Links S, pivoted to the ears f, are pivot-ally connected with the weighted levers Q, between their weighted and pivoted ends. In the circumferential groove of the sleeve R is placed a collar, g, which is connected with the slide J by a bar, T. By means of this construction the sleeve R is permitted to rotate freely with the governor shaft, and at the same time to impart vertical motion to the bar T and slide J when moved by the weighted levers Q.

Upon the stud K, carried by the slide J, is placed a slotted valve-operating lever, U, the stud K extending through the slot of the lever. The upper end of the slotted lever U is connected by a connecting-rod, V, with the end of the valve-rod b. A stud, h, projecting from the face of the slotted lever U, near the lower end thereof, extends through a curved slot, t, in a bridge, j, secured to the base B, and extending over the lever U. The lever U is free tooscillate on the stud K, and is prevented from falling by the stud hand the slotted bridge j.

To the lower end of the slotted lever U is pivoted the eccentric-rod W, which is provided with a strap, 70, encircling an eccentric, l, on the main shaft 0. The eccentric Z is arranged in the usual way with reference to the crank E. When the weighted levers Q of the governor are in their lowest position, the stud K is in the lower part of the slot of the lever U, and the eccentric Zwill impart to the valve G the greatest motion of which it is capable, opening the ports a a so as to admit steam to ICO the cylinder A through the greater portion of the stroke of the piston. As the speed of the engine increases, the centrifugal action of the weighted levers Q, causes them to rise, moving with them (through the rod T and slide J) the stud K, thereby diminishing the length of the upper arm of the lever U and correspondingly increasing the length of the lower arm, in this manner reducing the stroke of the valve G. \Vhen the normal speed of the engine is attained, the relation of the stud K to the slotted lever U will be such as to cause the valve G to admit to the cylinder sufiicient steam at the early part of the stroke of the piston to maintain the speed of the engine; but should the load on the engine increase so as to diminish its velocity the weighted levers Q will fall, thereby moving downward the slide J and the stud K, increasing the stroke of the valve so as to admit steam for a longer period to the cylinder A.

Should the sudden removal of the load from the engine require the complete shutting oft'of the steam, a slight increase in the motion of the engine will cause the weighted levers Q of the governor to rise, thereby carrying the stud K to the extreme upper end of the slot in the lever U, opposite the connection of the connecting'rod V. This brings the valve G over both ports a, and the oscillation of the lever U has no effect upon the valve G. The steam in this case will remain entirely shut off until the speed of the engine is suiiiciently reduced to allow the weighted levers Q to drop and again carry the stud K below the connection of the connecting rod V.

To the side of the guide H is secured a scale. m, the whole length of which represents the complete excursion of the slide J. The scale m is divided into equal parts, representing fractions of the excursion of the slide J, also fractions of the stroke of the valve. To the slide J is secured an index, n, which extends over the scale m, and is used in making readings of the scale.

It is obvious that, in lieu of the ordinary centrifugal governor shown and described in connection with my improved cut-off, any of the well known governors may be used for varying the position of the slide J and stud K.

The advantages secured by my invention are its great simplicity and adaptability to ordinary engines provided with plain slide-valves.

Having thus fully described myinvention, I claim as new and desire to secure by Letters Patent-- 1. In an automatic cut-oft for steam-engines, the combination, with the valve and eccentricrods of the engine. of thestraightslotted valveoperating lever U, provided with the stud h, and pivotally connected with the valve and eccentric-rods, the bridge j, provided with the curved slot 7', the slide J, provided with the stud K, and means for moving the said slide J, substantially as specified. I

2. In an automatic cut off forsteam engines, the combination of the slide valve G, valverod 7), straight slotted lever U, connecting-rod V, pivoted to the said valve-rod and slotted lever. the eccentric-rod WV, pivo'tally connected with the slotted lever U, the guide H, slide J, stud K, carried by the said slide and secured to the slot of the lever U, and the rod '1 and centrifugal governor connected therewith, snbstantially as specified.

EMILIO QUEROL Y DELGADO.

Vitnesses:

C. SEDGWICK, E. M. CLARK.

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