US88497A - Improvement in steam-engine governors - Google Patents

Description

.TEREMIAH A. MARDEN, OF BOSTON, MASSACHUSETTS, ASSIGNOR TO CHARLES E. AND IJOHN H. ABBOTT, OF SAME PLACE.

Letters Patent No. 88,497, dated March 30, 1869.

IMPROVEMENT IN STEAM-ENGINE `G-OVERII'OIRS.

The Schedule referred to in these Letters Patent and making part of the same.

To all whom it may concern:

Be it known that I, JEREMIAII A. MARDEN, of Boston, in the county of Suffolk, and State of Massachusetts, have invented certain Improvements in Governors for Steam-Engines, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, making ,part of this specification, in which- Figure 1 is a perspective view of the exterior' of the casing which encloses the valve, witll such 4portion of my improvements applied thereto as are situated outside.

of the same, soule of the mechanism being sllown in elevation, the various parts being in the position tlley occupy when the valve is wide open.

Figure 3 is all elevatioll, representing the receptacle which contaills a portion of lny improvements broken away, to show their construction, the parts being in the posit-ion tlley occupy when the valve is nearly closed.

Figure 4 is a section entire line x x of fig. 2.

Figure 5 is a perspective view ofthe extension paddle-blade, with some of the mechanism immediately colnlected therewith.

My invention consists in one or more extension paddie-blades, revolving in a receptacle containing oil, or other suitable fluid, the increased resistance on the extension-blade or blades, occasioned by its or their increased Aate of speed through the fluid, causing the blade or blades to be deflected, in such manner as to operate certain devices connected therewith, and partially close the valve to the steam-chest, thus reducing the pressure of the steam, and consequently checking I the speed as required; and, in combination with such extension paddle-blade or blades,

My invention also consists ill a rocker-shaft, which raises or allows to descend a sliding rod, which servesl as a movable fulcrum for the upper of one` of a series of levers connected with the valve-stem, weigllts of different denominations being employed, according to the mean degree of speed which it is required for the engine to maintain.

To enable others skilled in the art to understand and use lny invention, I will proceed to describe the manner in which I have carried it out.

In the said drawing, the base of the casing A, which encloses the valve-chamber, is secured to the steamchest of the cylinder, the induction-passage communicating with the valve-chamber.

The stem of thevalvc passes through the outside of the casing, at a, and has secured thereto a short bent level', B, to the outer end ofwhich is pivotcd the lower end of an upright level', C, which carries weights, D, of the denomination necessary for maintaining any desired uniform rate of speed predetermined.

The upright level' C passes through a slotted guide, I), and has pivoted to its upper eml the outer end of Figure 2 is a longitudinal section through the centre all arm,'or lever, Ewhieh rests in a bifurca'ted fulcrum, c, at the uppenend of a vertical rod, F, which passes through the top of a receptacle, G, containingoil, the lower eml of this vertical rod extending down illto the receptacle, and being free to slide up alld down, when acted on by mechanism hereafter to be described.

The inner end of the level' E is pivoted, at ll, to a short stud, O, rising from the top ofthe oil-receptacle, G.

'A horizontal shaft, H, passes .through alld has its bearing in the stud O, the outer extremity of the shaft having a drun1,'or pulley, I, secured thereto, while the inner extremity of the shaft carries a bevel-wheel, J, which meshes into a bevel-wheel, K, on the top of a vertical shaft, or spindle, c, passing through the centre of the top of the oil-receptacle G, the shaft ofthe bevel-wheel being hollow at its centre, to allow the rod F to slide freely up and down therein.

The lower end of the hollow shaft, or spindle e terminates ill a circular flange, or plate, L, which is bent down at points diametrically opposite, forming two forks, f f, into which the ends of'a short'shaft, g, have their bearings.

One extremity of this short shaft projects outside one of the forked bearings, alld has secured to it a paddle-blade, M, of a curved form in the direction of its length, t. c., downward, while it is flat in its horizontal cross-section.

A sliding sleeve surrounds, or partially surrounds, the paddle-blade L, and forms all extension-piece, N, thereto.

To the lower cud of this extension-piece is pivoted the lower end of a straight rod, h, while the upper end ofthe rod is pivoted, at Ii., 4to a projection on the under side of the circular flange, or plate L, by which construction-the paddle-blme, with its extension, is free to move longitudinally into an inclined position.

The centre of the shaft q has formed thereon a short arm, 7:, having a cup-shaped recess, l, at its outer end, into which the lower end of the vertical rod F rests.

Over the pulley I, and a pulley on the crank-shaft,

- (not shown,) is intended to be passed a belt, by which the motion of the engine is communicated, to drive the pulley I, and, through the connections above described, to revolve the extension paddle-blade around witllin the oil contained in the receptacle G.

The normal position of the paddle-blade and its extension, when at rest, is that showll ill lig. 2, the lower end of the extension being slightly above or even with the bottoln ofthe blade; but, as the valve opens, and steam is let on, they commence to revolve through the oil, the resistance of which thereto, as the speed of the engine increases, causes the blade and its extension to be deflected, the latter sliding dowll upon its blade, and the outer ,end of the arln k is thrown up, thereby raising the vertical rod F intovthe position shown in lig. A

The ascent of the rod F raises the outer end of the upperl lever, E, and with it the upright weighted lever C, which, in its turn, brings np the outer end of the lower lever, B, connected with the valve-stem, and closes the valve sufficiently to shut off a portion ofthe steam necessary to reduce lche speed to the uniform rate determined on, the extension of the paddleblade sliding up thereon, and the blade itself approaching toward the position seen in lig. 2.

To prevent any objectionable flaring ofthe oil, when pressed upon by the paddle-blade, l provide the receptaole G with a series of projections, on, which serve to keep the surface of the oilcomparatively level, and thus insure the paddle-blade being properly immersed therein.

It will be seen, that when the engine is revolving blade may be connected to the rocker-shaft H, and other uid than oil may be used in the receptacle G; but I prefer the use of oil.

. Instead of three levers, B G E, one, only, if properly Claims.

'What I claim as my invention, and desire to secure by Letters Patent, is

The sliding adjustable paddle N and rod 71, substantially as set forth.

Also, in combinationwith the above paddle-blade N, the rocker-shaft g, sliding rod F,- and Weighted lever, for operating the valve, substantially as set forth.

JEREMIAH A. MARDEN.

fitnessesz N. W. STEARNs, L. E. BATCHELLER.

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