US943095A - Governed pump. - Google Patents

Description

N. MOCARTY.

GOVERNED PUMP.

APPLICATION nun) A1104), 1909 943,095, Patented Dec. 14, 1909.

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UNITED STATES PATENT OFFICE.

scum: was, or mmnurous. mmana, assmnon. 'ro arms snows woaxs, or mmwaronzs, mums, a coarons'rron or mmnm oovsnmsn rum.

Specification of Letters Patent.

Patented Dec. 14, 1909.

Application filed August 9, 1909. Serial N0. 511,985.

COMM.

Be It known that I, Norman MCCARTY,

The object of my invention is to produce 5 a' 'm ca bio of delivering variabl measur d qhaniii ies of a fluid, and of suc charactor that no material pressure will be exerted upon the mechanism by means of which the amount of delivery is varied, thus making a pump which is especially adapted for use in delivering successively measured, variable quantities of liquid fuel to on inte'rnalcombnstion en of the non-explosive'ty' the adjusting mechanism of the pump mg connected with a speed controlled governor driven by the motor.

The accompanying drawing, which is a vertical section, illustrates an embodiment of my'invention.

In the drawing, 10 indicates a suitable bbdy havmg' a pump chamber 11 orme'd therein. Projected into chamber 11, through a suitable packing gland 12, is a displacing plunger 13 which may conven- Ien y have a uniform stroke produced in andesired manner, as, for lnstance, by means of the arm 14 carried by stra 15 surrounding an eccentric 16 carried y shaft I7: Leading into chamber 11 is a su ply pipe 18 in which is arranged the usual inwardjy opening check valve 19, and leading from chamber 11 is a discharge pi e 21 in which is mounted the usual outwar ly openin' check valve 22. Also pro'ccted mto ch ber 11, through a. suitable packing "land 23, is a compensating plunger 24.

ung'er 24 at its outer end, 13 formed into a plunger 25 which passes through a suitable 'acking land 26 Into a ressure chamber 7 into w ich is introduce through a suitable ipe 28, a ielding fluid pressure of stifliclent amoun to propel plunger 24 throu h the packing ofidglnnd 23 when pluu gar 1 is being retract u Plunger 24 in its outward stroke, needs to be definitely and uniform] limited, and any: desirable slop run be m opted for this pa pose. Probably he most convenient entlstruction however is to provide a shoulder 8'! in chamber 27 against which the end I caused to engage stop 35,

with a roller 34 ada ted to cage of plunger 25 will be driven and thus limit the outward movement of plunger 24.

In order to vary the suction eil'ect of plunget 13 upon the contents of supply ipe 18, an adjustable stop mechanism need; to be provided to variably limit the inward stroke of the compensating plunger 24, and for this purpose I secure to plunger 24, at 32, a lever 33 which is provided at its outer end ge an adjustable stop 35, sai stop bem adjustably mounted in an arm 36 carried by a bracket- 37. Lever 33 is provided with an intermediate slot 38 into which is projected a pivot pin 39 carried by an arm 40. Pin 39 is also projected into a slot 41 formed in bracket 37, said slot lying at an angle which is substantiall coincident with the an ular osition of ever 33 and its slot 38 w en \ston 24 is in its outermost position so that, in this position there may be a, shifting of pin 39 without producin any swinging movement of the lever 33. no 40 is carried by an eccentric strap 43 mounted upon an eccentric 44 carried by a rock shaft 45, which may be rocked by suitable connections 46 with a speed controlled governor 47.

lVith the parts adjusted as shown in the drawing the operation is as follows :V\'ith the displacing plunger 13 at the end of its out-ward, or suction, stroke, compensating plunger 24 has been driven inward by the pressure within chamber 27 until roller 34 engages head 35 and as this movement of plunger 24 has been (to-extensive, in displacemrnt volume, with the withdrawal of plunger 13, there will have been no flow of material from supply pi e 18 into chamber 11 and consequently, wicn plunger 13 is projected into the pump chamber ll,plunger 24 will be driven out of the chamber 11. by the pressure exerted by plunger 13, lllllll the end of plunger 2 engages stop 31 which will not be until plunger 13 has reached the inner end of its stroke. Consequently there will be no discharge through pipe 21. Durlog all of this time the only prrssurc. bryoml the more weight of lever 33, upon pivot ill], was during the time when whorl ill was in rngugvun-nt with stop 35 and amounted to not more than twice the total prcssuw exerted in am the inner and of plunger 2 which, 0 course. m't'd not be great. lly shilling pin 31) to the left, roller ill will he and thus pl'm'cfll Ill!) l'll further inward movement of plunger 24, be-

fore plunger 13 has finished its outward i of stroke. Consequently a quantity of li aid will be drawn into the map, more or ess depending upon the di erences in volume movement of the two plungers and, upon the return or inward stroke of the displacing plun er 13. plunger 24 will be driven outwar ly to its stop before plunger 13 will have finished its inward stroke and there will be a consequent discharge of liquid from the pump. It will be noticed that, by this arrangement, no definite proportion be tween the displacement volume of the two plungers l3 and 24 need be rovided becapse the inward movement of t e compensating plunger is a yielding movement Wl'llCl merely follows the outward movement of the plunger 13 and therefore can at no time exceed, in volume, the volume withdrawal of the plunger 13. On the return or inward stroke of lunger 13 the compensating plunger 24 is forced outward] volume for volume, by the plunger 13, until the positive sto 31 is reached.

y this construction, it will be apparent, that I have succeeded in avoiding it did:- cult which has heretofore existed in pumps of this general type where, because of a positive connection between the displacing plunger and compensating plunger, very great care had to be exercised in accurately proportioning the two plungers.

I claim as my invention:

1. The combination with a pump chamber, of a displacing plunger projectable into and out of t :e pump chamber, a compensating plunger projectable into and out of the pump chamber, a stop arranged to limit the outward movement of the compensating plunger, means, independent of the displacmg plunger, for driving the compensating plun r inwardly, stop mechanism associate with the compensating plunger for limiting the inward movement thereof, and means by which said last mentioned stop mechanism may be adjusted to variably limit the inward movement of the compensating plunger.

2. The combination with a pump chamber having inlet and outlet valves, of a displacing plunger projectable into and out of the pump chamber, a compensating plunger Emjectuble into and out of the pump chamer, a stop arranged to limit the outward movement of the compensating plunger, means, independent of the displacing plunger, for driving the compensating plunger inwardly, stop mechanism associntcd with the compensating plunger for limiting the inward movement thereof, and means by which said last mcntioncd stop mechanism may be adjusted to variably limit. the inward movement of the compensating plunger.

3. The combination with a pump chamber I a displacing plunger projectab e into and 5 out of the am chamber, a compensating plun er pro ecta 1e into and out of the pump cham a stop arranged to limit the outward movement of the compensating plun er, means, inde ndent of the displacmg plunger, for yicl ingly driving the compensatmg plunger nwardly, stop mechan- 13m associated with the compensating plunger for limitin the inward movement thereof, and means y which said last mentioned stop mechanism may be adjusted to variably limit the inward movement of the compensating plunger.

4. The combination with a pump chamher having inlet and outlet valves, of a displacing plunger projectable into and out of the pump chamber, a compensating plunger projectable into and out o the pump chamber, a stop arranged to limit the outward movement of the compensating plunger, means, inde endent of the displacing plunger, for ye dingly driving the compensatmg plunger inwardly, stop mechanism associnted with the compensating plunger for limiting the inward movement thereof, and means by which said last mentioned stop mechanism may be adjusted to variably limit the inward movement of the compensating plunger.

3. in a pump, the combination with a pump chamber, of a displacin plunger projectable into and out of said amber, a compensating plunger projectahle into and out of the chamber, means, independent of the displacing plunger, for driving the compensatmg plunger inwardly, a stop for uniformly limiting the outward movement. of the. compensating plunger, a lever connected at one end to t e compensat' plunger, a stop arranged to enga e said ever, a crum for said lever, an means for shifting said fulcrum relative to the lever to vary the relation between said lever andits stop. 110

(S. In a ump, the combination with a pum cham r, of a displacm plunger proecta le into and out of said c iamber,a compensatin plunger projectuble into and out of the c lumber, means, independent of the 115 displacing plunger, for yiel ingl driving the com ensating plunger inward y a stop for uni ormly limiting the outward move ment of the compensating plunger, a lever connected at one end to the compensating 120 plunger, a stop arranged to engage said le var. a fulcrum for said lever, and means for shifting said fulcrum relative to the lever to vary the relation between said lever and ils stop.

7. In a amp, the combination with a pmn chum )c1', of a displucm plunger procctn tie into and out of said c iamberm compausutin plunger projectahlc into and out of tho ciambcr, means, independent of the 130 displacin plunger, for driving the compen satm p inwardly, a stop for muform y limiting the outward movement oi the compensati plunger, a lever connected at one end to t e compensati plunger, a stop arranged to engag said ever, a fulcrum for said lever, an means for shifting said fulcrum to vary the relation between the lever and its stop.

8. Inha ump,f thg ciimbinatilon with a um c am r,o a ispacmgpungerproiiecta iile into and out of said chamber, a compensatin plunger projectable into and out of the amber, means, independent of the displacing plunger, for yieldmgly'dnw ing the compensating plunger inwardly, a stop for uniformly limiting the outward movement of the compensating plunger, a lever connected at one end to the compensating plan 1, a sto arranged to engage said lever a crum or said lever, and means for shifting said fulcrum to vary the relation between the lever and its stop.

9. Inl a ump,f tha ctlimbinatilon with a um clam r,o a 18 ac ungerproi ecta le into and out of aid t zfia inbena compensatingdplunger also projectable into and out of sax chamber, a prmrtzplunger and its pressure chamber associa with said compensating plungler to yieliilfigly drive said compensating p unger mw y, a. stop for uniformly limiting the outward movement of the compensating plunger, and means associated with the compcnsatgig plunger for variably limiting its inw movement.

10. In a ump the combination with a pum chum r, of a displacm plunger proecta is into and out of said c amber, a comisatin lun er also project/able into and ii t of said chaiiiber, a presspre lunger and its pressure chamber associa with said compensating plunger to yleldlfily drive said compensating plunger inwa y a stop for uniformly limitin the outwa movement of the compensa ingdplunger, a lever connected at one end with e compensatin member, a stop arranged in the path 0 movement of said lever to limit the inward movement of the compensating plunger, a fulcrum for said lever and means for shifting said fulcrum to vary the relation be tween said lever and its stop.

11. In a pump, the combination with a pum chamber, of a displacing plunger proecta le into and out of said chamber, a com pensating plunger also projeetable into and out of said chamber, a pressure lunger and its pressure chamber associat with said compensating plunger to yieldirsgly drive said compensating plunger lnwar y a stop for uniformly limiting the outw movement of the compensating lunger, a lever connected at one end with t e compensatin member, a stop arranged in the path 0 movement off said lever to limit thle inward movement 0 t e compensating p u r, a fulcrum for said lever, and means foi s hi ing said fulcrum relative to the lever to vary the relation between said lever and its stop.

In witness whereof I have hereunto set my hand and seal at lndianapolis, Indiana, this second day of Au st, A. D. one thousand nine hundred an nine.

NORMAN MoCARTY. [1,. s.)

Witnesses:

Aimma M. H000, Tnomas W. McMmms.

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