US395376A - allen - Google Patents

Description

(No Mqael.) I 2 sheetssheen 1. Jv. IH ALLEN.

Y GUT-OPE'GOVBRNOR. No. 395,376. Patented Jan, 1 1-889,

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WITNESEEE INVENTUR N, PETERS Phummhogmpmr. wuhinqlon, llt;v

FUNITED STATES PATENT JOHN F. ALLEN, OF N ElV YORK, N. Y.

CUT-OFF GOVERNOR.

SPECIFICATION forming part of Letters Patent No. 395,376, dated January 1, 1889.

Application tiled February 23, 1888. Serial No. 264,950. (No model.)

T0 @ZZ whom, t may concern:

Be it known that I, JOHN F. ALLEN, ot' New York city, New York, have invented a new and useful Improvement in (,utOltl Governors, of which they following is a speeitication.

My invention relates to improvemelits in automatic val ve-gears in which the regulator' or governor an d eccentric are so arranged as to cut ot the steam to ci'rrrespoud with the varying load of the engine. This is aceon'iplished when a constant lead oli" the valve is desired by causing the center ot' the eccentric to move upon the are described by the end of the valveeon nection attached to the eccentric whenever the engine is on its lineoti' Centers. 'hen the ecccentric operates a supplementary cut-oil" valve, the eccentric maybe moved or advanced simply around the shaft, as a constant lead is not required in that fase.. 'lhechiet di tiiculty in operating valve-gears of this kind whenever the eccentric operates the valve is, that when the oenterof the eccentric is notin line with the center oli' the shat't oron (head-center in relation to the direction ot the load or resisting torce, or when the same is at right angles to the direction ot' this Force, then the eccentric or regulator will be more easily moved than the valve itselt", and whenever this occurs the valve-gear will become useless.

The object ol my inventiiim is to overccune this difficulty and at the same time make the regulator or governor more isochronalJ and therehy keep the number ot' revolutions made by the engine more constant under the varying load that may he required.

ln the accompanying drawings, l `igu re l represents a side view of my lm proved cut-ott i governor vFor steam-engines. Fig. ll is a vertical section ot the same. Fig. Ill is a plan ot' the rock-shat i; Fig. IY, anv end view of arm l) and eccentric ot' the rock-shaft, and Fig. V an end view of arm lil otl the same.

l-S is a pulley or ily-wheel disk in which the mechanisnl is arranged, securely 'fastened to the sliat't A.

QF is a rock-shaft passing through the hul) or web ot' the pulley or disk B and turning in the same. This rock-shaft is provided with an arm, l), upon which the eccentric C is suspended or arranged to forni part of said arm. The other end o l this'rocleshat't is provided with an arm, E.

The swinging' ends of the arms D and E are provided with suitable openings for the shaft A to pass freely at any position of the ends of said arms. (See Figs. IV and V T are two curved weights. (me end ot' each is pivoted at 1c to the pulley or disk l5, and their other free ends are connecttal through rods (l (lf to the rock-shaft arm lt. Thus the weights, in connection with the rods (nl, turn ing upon the arms lt, form in eliect a pair ot' reverse toggle-1- oi 1 x ts.

Upon the outer ends ot' the weights W flat springs .S S are bolted, theI t'ree ends ot' which bear against the inside oli the riiu oli' the pulley or disk l. These springs curve or roll upon the curved outer surfaces of the `weights whenever the same are forced out war l hy (entriliugal force sutiic-ent to overcome the resistance ot said springs.

By the inward or outward `motion otf the weights \\Y the centers oli' their iiree ends will move lbetween the points l and and through their connection 'with the Free end ot the arm E, through the rods (i (i, the center ol' the tree end oli' this arm hl will be moved betwtam the points and -fl-7 moving thereby the center ot' the l'ree end olil the arm D, and consequently the center ol the eccentric C loetween the points and o. Consequently the throw o l the valve will be increased or diminished colnmensurate with ther speed of the eu gine. I

(me ol' the important t'eat'urcsot myinvention is that the eccentric is locked against; any ,liorce acting parallel with a line passing through the joints ot' connection oi' one of the weights XV, and as this passes o't' the force comes then to act parallel. with a line passing through the joints of the other weight It wil l be observed that the eccentric is more easily moved when the reaction cau sed by ineving the valve acts in a line at right angles to a radial line drawn :from the point of suspension F to the center of the eccentric indicated by the are from 5 to G. lt will also be observed that aline drawn through the points zo of suspension of the weights XV is nearly at right angles with the before-mentioned line. Therefore any force acting in the direction of the latter locked by these iixed centers the more it approaches the line of deadcenters of these points of suspension.

IOO

Another important :feature of my invention consists in the 'flat eurved springs being curved o r rolled upon the weights, whereby as the weights move outward the force of the same increases by shortening their length. At the saine time the leverage of the weights to overeome these springs has beeome longer7 thereby keeping their resistance more equal with the eentii'ugal foree 'for all positions et the weights, or in a measure more isoehronal. In place ot' using two weights, but one may be employed, though the resul t will not be as satistaetory.

Thenever the weights are arranged. on the same side as the lever D, Carrying the eeeentrie C, the rods G will be attached direet to this arm D, dispensing thereby with the seeond arm E.

That I elaiin isl. The Combination of swinging weight YV with the eonneeting-rod G, one end of the latter turning' upon arm E, the whole constituting a reverse toggle-joint Vfor moving arm E,

Y substantially as specified.

JOHN F. ALLEN.

Witnesses:

HENRY E. ROEDER, F. V. BRIEsEN.

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