US395882A - Governor for engines - Google Patents

Description

I (No Model.) 3 Sheets-QSheet 1. D. P. DAVIS.

GOVERNOR FOR ENGINES.

Patented Jan. 8, 1889.

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(No Model.) 3 Sheets-Sheet 2. DP. DAVIS.

GOVERNOR FOR ENGINES.

iM Patented Jan. 8, 1889,

N. PETERS. Mmho n mn Waminpan. 0.6.

(No Model.) 3 Sheets-Sl1eet 3. D. P.'DAVIS.

GOVERNOR FOR ENGINES.

Patented Jan. 8, 1889.

WITNESSES: 4%

INVENTOR,

DAVID P. DAYIS, OF ALLEXDALE, Xidf JERSEY.

GOVERNGR FOR ENGIN Ap licet T0 aZZ whom it may concern.-

Be it known that 1, DAVID 1. Davis, a citizen of the United States, residing at Allendale, in the county of Bergen, State of Xew Jersey, have invt-uited certain new and useful Improvements in Governors for Engines, of which the l'ollt'nving' is a speciticatitm.

My invention relates to governors that are adapted to act upon the eccentric otthe cutotl mechanism of a steam-engine, so that the position of the center ot the eccentric with relation to the axis of the shaft will be changed and. a variation ot stroke n'oduced to govern "Patent No. 395,882, dated January 8, 1889.

the supply of steam bv the period of cut-oft, i

and thereby compensate for the varyingloads put upon the engine.

Herctoiore various devices have been employed to overcome the ditticultv arising in holding the eccentric rigidly against displacement due to the frictional resistance of the Q caused to assume, and of valves that lock the t flowing-ports through which the liquid is admitted or withdrawn from either side of said piston, the said valves being operated by means of the centrifugal eoverning-weight.

Referring to the accompanying drawings, Forming a part of this specification, and in which similar let ters of reference indicate corresponding parts thrmrghout the several views. Figure l is a front elevation of a fly- I I u t wheel or driving-pulley bearing a movable eccentric, an eccentric shifting weight and spring, and the liquid locking device connected therewith. Fig. 2 is a central trans verse section of Fig. l and Fig. 3, a sectional detail view on the line Jr .11, Fig. l. Fig.1 is a view corresponding to l ig. Lomitt ing' the eccentric shiitine' weight and spring; Fig. 5, a

front elevation illustrating the invention applied to a modified construction ol' the movable eccentric; 6, a transverse section on the line y y, Fig.

Fig. 7 is an enlarged de- Serial No. 281,936. We model.)

tail view taken in cross-section on the liney y,Fi 9;. and Fi e. 8, an enlarged detail view taken in section on the line 2 Fig. 7.

Referring to Figs. 1, 3. and 3. t" is the cccentric operating the slide-valve or other cut oil? mechanism of the steam-cylindcr; D, guidcwaw's upon which the eetf'entric is made movabletransversely, but rotativel carried with the tlriving'pulle v A and shaft B.

The eccentric block C is slotted, as shown at F, to permitits movement over the shaft upon the guidewavs D. the latter being attached to the hub of the wheel. The guideways are preferably of beveled form, as shown, the wear of the samebeinetalten upbyagib. (I, having tie-litcning-bolts D.

G is a centrifugal weight that actuates the eccentric block upon its guidewa vs, and H an opposing contractile spring counteracting the centrifugz'tl force of the said weight. Both the weight and the spring are made adjustable as to etticicnc vthe former by its sectional construction 1; (Z c, whercb it may be built up or decreased, as circumstances require, and the latter by its screw-shackle connections to the eccentric blocl; and to the rim of the wheel, respcctiwly, by right and left screw-threads provided with jam-nuts 7a.

I is a pistonrod extending" from the weight G, bearing a piston, .T, Fig. within the cylinder K, which latter is swiveled to the rim of the wheel at a point, f, diametrically opposite the susperiding-point of the spring ll.

L is the centrifugal governing-weight, adj ustable upon the lever g, tulcru med as shown, carrying with it a cylinder-valve-opcrating' shaft, 2.

Counteracting the weight L is the contractile spring M, connected by adjustable screwshackle connections similar to those of the spring H between the arm 1 of the lever g and the wheel-rim.

In Fig. t the piston-rod I is shown connected with the eccentric block operating in guideways l, similarly to Fig. l. The centrifugal weight G is in this instance omitted, as also its counteracting spring, and the trio tional resistance of the cut-off mechanism upon the eccentric is depended on to move the eccentric from one position to another when the piston in cylinder K is released.

In Fig. 5 the piston-rod l is swiveled to the eccentric C, and the said eccentric is moved upon a fulcrum at O of its arm N, in lieu of operating .in guideways, as in the former instances. The slot F is curved to correspond with the center of movement, and a small curved slot, I, and a guiding-stud therein are also provided to retain the eccentric in its plane of movement and preventits being displaced laterally.

The form illustrated in Fig. may be used in connection with the in vcntion. with or with out the centrifugal weight G and sprin ll.

Referring to l igs. 7 and 8, the miiposite chambers of the cylinder K are tilled with liquidpreferably such as oil and glyccrine or other non-freezing com1 )oundand they communicate by the run-around ports j through chamber "1' when the intercepting check-valves l l are open. N a cam within the chamber 1', fixed to the shaft 11, which cam engages with the webbed stems of the checkvalves Z I, so as o alternately lift the one or the other from its seat when the weight I, is retracted toward or thrown from the centerol. the wheel, as the case may be. The rescating of the valves when released by the cam is assisted by the valve-springs n. The shaft h of the cam is packed tight through the gland 5, being left free to rotate.

on are cramping screw-plugs, used to adjust the capacity of the ports and regulate the amount of retardation offered to the How of the liquid and to the movement of the eccentric.

In Figs] to (i, inclusive, the eccentric is shown in a position to give the minimum stroke and to cut ot't' the admission of steam to the engine-cy'dinder at an early period of the stroke of the steam-piston. In operation, as the engine assumes its normal speed, the weight L arrives at its mid-position shown in the figures, wherein the cam N is disengaged from both valves H, the said valves remaining seated, so as to lock. the piston J inactively between the confined liquid. An increased load upon the engine will cause the retraction of the weight 1 in the direction of the arrow 0, causing the cam N to bear upon the check-valve l. The contractile action of the spring H then moves the piston .l' and weight G toward the axis of the shaft, carrying the center a of the eccentric in the direction of the arrow to give an extended stroke. A decreased load is followed by the opposite action of the weight L in the direction of the arrow p, lifting the check-valve Z, causing an opposite automatic movement of the several parts until a normal speed is resumed. It is obvious that a similar o jmration will take place in the absence of the weight and spring G If, due to the frictional resist ance on the eccentric, as aforesaid, the back and forward pressure of the eccentric-strap incident to each revolution being yielded to one Way or the other at the successive turns, according as the check-valve Z or Z may be raised. The slot F, being extended both ways across the eccentric disk, enables the direction of rotation 'in' which the engine is driven to be reversed by disconnecting the 5 piston I. and reversing the position of the eccentric.

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

1. In a governor for engines, the combination of an eccentric operating the cut-off mechanism, capable of variable adjustment of its center to or from the axis of the shaft, with a liquid-confined locking-piston connected with said eccentric and adapted to hold the same against displacement during rotation or to release the eccentric by release of the liquid confining said piston.

L. In a governor for engines, the combination of an eccentric operating the cutoff mechanism, capable of variable adjustment of its center to or from the axis of the shaft, with a liquill-confined locking -piston connected with said eccentric, check-valves normally opposing the escape of the liquid conlined upon either side of said piston, and an ai'itomatie check-valve-tripping mechanism, consisting, substantially, ot' a centritugallyoperated weighted lever, a retraeting-spring, and a tripping cam or toe operated by said weighted lever and spring to release the conlined liquid, in the manner set forth.

The combination, with an eccentric t rans- Vcrsely movable in parallel guideways for the adjustment of its center at variabledistances from the axis of the shaft, of the herein-described liquid-confined locking-piston, liquidreleasing valves, centrifugal valve-operating weight, and counteracting spring, adapted as and for the purposes herein set forth.

at. The combination, with an eccentric swiveled upon a fulcrum aside from its center to move transversely for the adjustment of its center at variable distances from the axis of the shaft, of the herein-described liquid-contined locking-piston, liquid-releasing valves, centrifugal valve-operatin g weight, and counteracting spring, adapted as and for the purposes herein set forth.

The con'ibination, with an eccentric transversely movable for the adjustment of its center at variable distances from the axis of the shaft, a centrifugal eccentric moving weight, as G, and a retractingspring, as H, of the Z herein-descril ed liquid-contim'id locking-piston, llqn id-releasi n valves, centrifugal valveopcmating weight, and counteracting spring, all adapted as and 'lor the purposes set forth.

DAVID P. DAVIS. Witnesses:

(inxs. ll. AnoN, HENRY F. PARKER.

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