US1534612A - Pulsator for milking machines - Google Patents

Description

Aprily 2l, 1925. v 1,534,612

J. A. SCHMITT PULSATOR FOR MILKING MACHINES Filed NOV. 28, 1922 2 Sheets-Sheet 1 l Awww-vw. @www Aprilzl, 1925. l 1,534,612

, J. A. SCHMITT PULSATQR FOR MLKING MACHINES Filed Nov. 28. -1922 2 Sheets-Sheet 2 l l' y gnwmo@ 451m 45 .y v

with. the movable parts.

Patented pr. 21, 1925.

n UNITED STATES 1,534,612 PATENT oFFici-z."

JOHN A. SCHMITT, OF COLUMBUS,A 0HIOASSIGNOR TO THE UNIVERSAL MILKING MACHINE COMPANY, OF COLUMBUS, CHIC, A CORPDRATION 0F OHIO.k

rULsA'ron ron- MILKING MACHINES.

Application filed November 28, 1922. Serial No. 6031,72?. Y

To all whom it may concern:

Be it known that I, J oHN A. SCHMITT, a citizen of the United States, residing at Columbus, in the county of Franklin and State of Ohio, have invented certain new and vuseful Improvements in Pulsators for Milking Machines, of which the following is a specification.

My invention relates to fluid pressure actuated pulsators or alternators for milking apparatus and analogous purposes.

The present application is a continuation and further development of the subject matter of my co-pending applications for Letters Patent Serial No. 505,257, filed October 4, 1921, and 539,167, filed February 25, 1922.

VVhle involving the same general structural features and mode of operation, the present invention contemplates an improved form of tumbler mechanism for intermit-` tently reversing the iuid pressure control valve and an improved and more economical means for connecting the actuating piston Whereas the previous constructions referred to involved theuse of a tension spring shifted to and fro past a dead center relation, with the valve to be operated, upon which it exerts a constant pulling influence, first in one direction and then in the other, the present construction is dependent upon a push and pull mode of transmitting movement from the prime actuator to thev movable valve` the movement of the valve being effected wholly upon one side of a dead center position, the valve being actuated by the reaction of a compression spring, intermittently.

compressed by both the push and pull impulses of the power transmission devices. This is accomplished by means of a telescopic power transmission link having the compression spring so interposed between the relatively rmovable telescopic members of the link, that botli the extension and contraction of such telescopic link will place the spring under compression. This telescopic link is connected eccentrically with a pivoted fluid pressure control valve, which is thereby moved .to and lfro across the pathof travel of a continuously moving` alternatingfstop` member, witliwvliicli 'tlievalve st {iuctureengages, firstupon one side fand;V l then .upon the other toiholdithevalve against' operative movement until the stop member and connected parts approach the limit of their stroke in either direction. iection between tlie actuating piston and the initial member of thev valve tumbling mechanisin is effected by a feather or key, carried by or movable vwith the piston stem and having sliding engagement in afkey way or -="i in the main structure or mount-ing and a non-sliding engagement in an elongated slotin the operated member, wherebythe latter' ismaintained in proper alignment during its reciprocation in unison with the piston. l

The object of the invention is tov simplify the structure as well as the means and mode of operation of valve reversing or tumbling mechanism for pulsator structures and the limit of the operative stroke, and to further t afford a. construction employing a compression spring, which will afford kgreater uniformity of action and longer period of uset fulness, than a spring subjected to elongation.

A further object of the invention is to afford a structure which may be produced with inexpensive machine operation, and,

which will require minimum adjustment and accuracy of fit, the valve members being of a substantially free oating type, subjected to minimum displacement strain, whereby they will tend to 'automatically find their seat, and maintain close contact under pre` ponderance of atmospheric pressure.

A further object of the invention is to The conprovide an improved connection between the,

prime actuator and the operated member,r

which will maintain the latter in predetermined alined path of" travel without presenting` difficulties ori obstructions to economical machine operations. A further object of the invention "is to provide an improved safety device v for the throttle control member,l which while'z pere mjitting ready I andeasy; adjustment, will pre1; i vent accidentali change= of'adjustinent` under' influence of vibration.

With the above prima-ry and other incidental objects in view as will more fully appearw'in the specification, the invention consists of the features of construction, the parts and combinations thereof, and the mode of operation, orvtheir equivalents as hereinafter described and set forth in the claims.

'In the accompanying drawings, wherein is shown the preferred, butobviously not necessarily the only form of embodiment of invention', Fig. 11is a top plan view-.ofthe assembled' pulsatorshowing the parts of the tumbler mechanism..,aproaching the limit of theirstroke inthe ldirection indicated by the darts.. Fig. 2 .is .aA side elevation of the assembledk pulsator structure. Fig. 3 is a top` plan view similar to Fig. 1,- but showinggthe operatingpartsapproaching the opposite limit of tlieinstroke in the direction indicatedy by thedarts. Fig. et is a top plan view yof, themainstructure or mounting with thecvalve tumbling mechanism removed. Fig. 5 is a vertical sectional view. Fig. 6 is a detail sectional view through the vreversiblecontrol valve and itsrcarrier. Fig. 7 is a detail perspective view of the control valve and `its vactuating parts- .disassembled- Fig. 8 is a` detail perspective view of the telescopic power transmission linkxwith the compression spring removed. Fig. 9 is a perspective .view showing the under sideV of the oscillatory control or locking member for the control valve; Fig. 10 is a perspective vien7 showing the under side of the reciprocatory pulsatorvalve. Fig. 11 is a vperspective view of i the connecting key for transmitting movement from the piston stem to the reciprocatory pulsator valve. Fig. 12 illustrates av modification.

Like parts are indicated by similar characters of reference throughout the several views.`

The;V structure herein shown is particularly adapted for being mounted upon the lid or coverof'a-pail or receiver, which will form t-he closure for the bottom of the vacuum chamber-contained in the base of the structure.- Otherwise the pulsatorismounted upon a suitable base. not shown, in lieu of such pail or receiver lid. In the particular form of embodimentillustrated, the pulsator ycomprises a vertically disposed cylindrical` chambered` base et, carrying at one sidethereof a laterally disposed integral short` cylinder portion 5, and adjacent to thiscylinder 5 and forming-the top of the base forA vacuum chamber is a flat table like valve bearingV surface 6. Upon this bearing surface or valve table 6, the pulsatoi and control valve are preferably mounted. The'vacuum chamber 7,' .within the base 4 is provided with a nipple or spud 8, through whichv it communicates with any source of suction such as a vacuum tank, a pump or other such device. The head of the base i immediately` beneath the'valve bearing surface is provided with a transverse bore v9. communicating with the interior of the cylinder 5, and within which bore reciprocates a piston stem 10, connected within the cylinder 5 to a piston head. The piston y head is actuated to and fro by alternation nately connecting the opposite sides of ythe.

piston with atmosphere and with the suction or vacuum chamber 7 respectively. To this end, the valve table 6 is provided with a group of three ports 17, 18 and 19. The intermediate port 17 extends downwardly through the head or top of the pulsator body and communicates at its lower end with the vacuum chamber 7, which in turn is directly connected by anipple or spud 8, with a source of suction. The port 18 communicates through a lateral passage 18', shown by .dotted4 lines, with the inner end of the cylinder 5. The remaining port v19 is likewise connected through a communicating passage 19 with the outer end of the cylinder 5 and beyond the piston head. These ports are controlled by an oscillatory control valve 20, pivot-ally mounted upon a stud 21, and oscillated to andl fro to alternately connect the suction port 17 with the respective ports 18 and 19. The disconnected port being uncovered by the movement of the valve 2O admits air at atmospheric pressure to the cylinder. At the same time, the opposite end of the cylinder is connected through the corresponding passage and port with the vacuum chamber 7. As a result the atmospheric pressure upon the piston head will shiftk the piston toward the end of the cylinder connected with the suction or vacuum chamber. This movement of the piston is transmitted to the valve 20 to rcverse the position of the valve and the com-- munication of the ports controlled thereby to admit air pressure to the opposite side of the piston 10 and reversing the connection of the cylinder 5 with the suction or vacuum chamber 7. Adjacent to the opposite'sidc of the valve table 6 is a second group of ports 23, 24 and 25, constituting4 the pulsator ports and controlled by the reciprocatory pulsator valve 26. The intermediate port 23 `communicates with the vacuum chamber 7, While the ports 25 and 26 are independenti ly connected with a separateteat cup connection in this instance a Y connection 27. The teat cup clusters are connected with the connections 27, and alternately actuated asthe valve 26 is reciprocated.

The pulsator valve 26 is recessed on'its under side at 26 to afford an intercommunieating passage between the intermediate port 23 and the respective ports 24 and y25,`

when the valve is at the opposite limits of its stroke. At one limit of its movement the valve 26 connects the ports 23 and 24, leaving the port 25 yopen to atmosphere, While at its opposite stroke this connection is reversed, opening the po-rt 24 to atmosphere and connecting the port 25 With the source of suction through the port 23.

As thus far described the structural features are quite similar to the prior constructions referred to.

The reciproca-tory pulsation valve 26 is slotted or splined on its under side as at'28 for engagement over a key or feather 29, carried by the rear end of the piston stem 1() and projecting above the top surface of the valve table 6. This connecting key may be of any suitable form. However, in the draw ing, 1t has been sho-Wn of a substantially T shape, having a laterally disposed screw stem 30, engaging in a screw threaded hole, in the extremity `of the piston stem 1.0. There is formed in the ta ble surface 6, a slot 3,3, communicating with the bore 9. The piston stem 10 extends Within the bore 9 While the T shaped lkey or coupling member 29 is inserted through the slot 83,- and is engagedtherewith by rotating the piston and stem by means of the slotted outer extremity 31 of the piston stem, to interengage the stem 10 and key or coupler 29. The head or engaging portion of the key or coupler 29 its bearing upon the surface of the table 6.y

The same is true of the. control valve 20, which likewise isv subjected to suction or vacuum onkits under side, through the port 17 While atmosphere affords a preponderance of pressure upon the top. The bearing surfaces forV the valve particularly the-pulsatorvalve 26 is slightly raised above the general. surfacerof the tablet vas particularly` shown' inFig: 4, andlthei'vralve asfit travels tofan'dfro extends;slightlysbeyondthe-limit? of such bearing surface in either direction..

The

This slight elevationof the bearing surface materially facilitates the manufacture and finishing of such surfaces and the tension of the valve laterally beyond the limit of such bearing` surface and its movement slightly beyond the extremity ofthe bearing` surface at the limit of its stroke makes the valve self cleaning. That is to say any sediment, dust or accumulation of oil upon the. bearing surface will be pushed by the valve off such surface onto the surrounding clearance space. The clearance of this bearing surface may be very slight. I*

The pulsator valve 26 being'y connected with the piston stem 10 through thekej7 or coupler 29, reciprocates in unison with the piston and alternates the connection of the teat cup spuds 27, with the suction or vacuum chamber 7. This movement of the pulsator valve alternately subjects each of the teat cup spuds 27 to the admission of air at atmospheric pressure and to exhaustion through connection with the vacuum chamber 7. n

This to and fro movement of the pulsator valve is transmitted to the control valve 20 to effect itsalternation as the piston and with it the pulsator valve 26 approach the koperated position until the pulsator valve and piston approach the opposite limits of their stroke,fvvhereupon the control valve is not only unlocked, but is actuatedwvith a snap over movement to its reverse position;

The fluid pressure control valve 20 is ac.- tuated to and fro by means of a valve carrier 35, pivoted concentrically With the valve 2O upon the stud 21. The valve and carrier` are interengaged to oscillate in unison yet leaving the valve 2()` free for independentad- `justment toward its'valve seat under atmospheric pressure and relieving the valve itself from incidental unseating pressures or strains. This valve 2O is provided in its under face with an elongated recess or vport 36 of sufficient extent to connect the port 17 with either the ports 18 or 19, according to the position ofthevvalve. For economy of manufacture, this valve 20 may be stamped from sheet metal. The stamping operation in forming the port or recess 36 embosses ory raises uponI the top of the valve a correspending rib or bead 37, which for economy is utilized to operatively interengage the valve With the carrier 35.- This carrier 35 is provided `With an arcuate slot 38, in Whiclr:` the'fproj ectingj rib *orbead 37" ofthe valve 20 engages;

The carrier 35 is actuated to and froby alternating push and pull impulses, transmitted from an oscillatory control member 40, pivoted to the main structure at 41, and overlying thek reciprocatory pulsator valve 26. The control member 40 carries on its under surface a stud or lug 42, which engages in a notch 42', in the top surface of the pulsator valve 26, thereby causing the control member 40 to move in unison with the pulsator valve and the piston alternately in opposite directions. The oscillatory control member 40 carries upon its upper surface a projecting stud 43, operatively connected by a telescopic link, withy a stud 44, eccentrically positioned upon the oscillatory valve carrier The telescopic power transmission link comprises two slotted members, relatively movable in longitudinal direction and arranged in overlapping relation. One of these members 45 has slotted engagement with the stud 43. ot the control member 40, while the other slotted member 45 of the telescopic link has slotted sliding engagement with tbe eccentric stud 44 of the valve carrier. rlhe overlapping ends of the slotted member 45 are provided with T heads or offset shoulders 46,which aifordabutments for the opposite ends of the compression spring 47, which surrounds and encloses the overlapping. portions of the link members 45, intermediate the heads or shoulders 46. The construction is such that whether the pull is outwardly upon the extreme ends of the overlapping slotted members or the push inwardlly upon the mean or overlapped ends of the slotted members, the effect upon the spring 47 is the same, causing the spring to be com pressed in order that by its reaction it may transmit a like impulse, that is push or pull upon the valve carrier to reverse the valve. In other words, the pulling eort or pushing effort as the case may be of the oscillating control members 41 is stored in the spring 47, by subjecting the spring to compression, to be later transmitted to the valve carrier. The valve carrier is provided with an upwardly projecting stop pin 48 at its free end, while the oscillatory control member 40 is provided with a coacting dependent fia-nge or lip 49. Under the pushing impulse of the control member, whereby the valve carrier tends to turn inwardly as shown in Fig. 1, the stop pin 48 rides upon the exterior margin of the flange 49 until the control member reaches the limit of its stroke, whereupon the pin will pass the end of the flange as the valve. reverses under the influence of the spring expansion. During the return movement under the pulling influence of the control member, the stop pin 48 will ride upon the inner face of the flange or-lip 49 until the control member reaches the opposite limit of its stroke, whereupon the valve will again be reversed by a second expansive movement of the spring. The stop pin of the valve carrier thus moves to andtro across the path of travel of the dependent flange or lip 49 of the control member. engaging the flange first upon one side and then upon the other. The movement ofthe valve is limited by such engagement until the parts approach the limit of' their stroke in either direction, whereupon the valve is released for reversal under the expansion of the spring. During the movement of' the parts in one direction as `shownin Fig. 1, wherein the control ymember exerts a pushing impulse, the studs 43 engagesV the head of the opposite slotted link member carried by the valve carrier stud, while the stud 44 Aof the valve carrier forms an` abutment for the head of the slotted link member, carried by the control member stud The movement of the stud 43 toward the valve carrier stud 44 forces the head 46 ofthe respective link members toward each other, placing the spring 47 under compression. As the stop flange 49 of the control member passes beyond the pin 48, the vexpansion of the spring oscillates the valve carrier from the position shown in Fig. l to that shown in' Fig.'3. During the return stroke whereby the control member exerts a pulling impulse, the studs 43 and 44 engage inV the extreme ends of the slots of the respective members 45, tending to reciprocate the members 45 outwardly in opposite directions, thereby again causing the heads 46 of the link members 45 to move toward each other and again placing the spring` 47 under compression. At the opposite limit of the stroke. the stop ange 49 again passes beyond the pin 48, but in the opposite direction, thereby releasing the valve carrier, which by the expansion of the spring is returned to the position shown in Fig. 1. It will be observed that the oscillation of the control valve carrier 35, occurs wholly upon one side of a head center position. That is to say, the valve does not reverse to and fro across a dead center position, neither is the actuating spring carried to and fro across a dead center point to exert its infiuence in diHerent. directions, as is a very common expedient. Likewise it is to be noted that although the valve is actuated by alternating push and pull impulses. the actuating` spring 47 is compressed by both impulses and by its subsequent expansion eX- erts its influence rst in one direction, and then lin the other, to transmit the initial push or pull impulse, to the oscillatory valve.

The speed with which the alternation or reversal occurs is controlled by regulating the capacity of the control port 17. To this end there is provided an adjusting screw 50. which intersects the port passage and by its adjustment serves to reduce the capacity of the port and hence the volume of air passing therethrough and so retard the speed of operation.

It has been customary to provide such throttle screws with lock nuts, by which they may be maintained in adjusted relation. However, the useof` a lock nut has been found troublesome in that the lock nut frequently sticks or jams, necessitating the use of tools to'release it. To overcome this difficulty a spring 51 is provided, which surrounds and encloses the exposed portion of the throttle screw, abutting at one end upon the head of the screw and at its op* posite end upon the main supporting struc operation of the parts to avoid complication,

it has been omitted.

rFhe detail view Fig. 12 has been shown as a j modification, wherein the oscillatory control member 40 has been wholly omitted,

yand the stop flange 49, corresponding to the flange 49 kbeforeidescribed is mounted directly upon ythe reciprocatory pulsator valve 26. This dependent flange 49 performs the same locking function, in Vcontrolling the valve carrier 35 as before described. In lieu of the actuating stud 43 carried by the control member, a `corre-vl spending stud 43? is mounted directly upon the reciprocatory, valve 26 and connected with the telescopic links, thus transmitting movement directly from the reciprocatory valve 26 to the control valve carrier 35.

From the above description it will be apparent that there is thus provided a device of the character described possessing -the particular features of advantage betore enumerated as desirable, but which ob'- viously is susceptible of modification in its form, proportions, detail construction and arrangement of parts without departing from the principle involved orl sacrificing any of its advantages. j

While in order to comply with the statute the inventionl has been described in lanuage more or less specific as to structural eatures, it is to be understood that the invention isnotlimited to the specific details shown, but that the means and construction herein disclosed comprises the preferred form of several modesA of puttingk the invention in to effect and the inventionis therefore claimed in any of, its forms or modifications within the legitimate and valid Score-0f the apperde Claires:

claim:

1. Iii a pulsator mechanism of the char' actery described, wherein a iiuid pressure actuated mechanism operates to alternately subject a pair of pulsation conduits to variations of fluid pressure characterized by an alternating member actuated. by said pressure operated mechanism, an oscillatory control valve for the Huid under pressure and an extensible aiid'contractible link between the alternating member and the voscil-L latory valve transmitting alternate push vand pull movements from the alternating member to the oscillatory valve. j

, 2. In a pulsator mechanism of the character described, wherein a fluid pressure actuated-mechanism operates to alternately subject a pair of pulsation conduits to variations of fluid pressure characterized by an alternating member, actuated by saidk pressure operated mechanism,an oscillatory control valve for thefiuid under pressure,and a compression spring compressed bythe .movement of thel alternating: member in eachdirection which by its successive re- Having thus described my invention, I

actionsactuates the control valve in alternate directions without passing adead center position in relation with the valve. i

H 3. In azpulsator mechanism of theycharacter described, wherein a fluid ,pressure actuated mechanism operates to alternately ,subject a pair of pulsation conduits to varia tions of fluid pressure, characterized by/arr alternating member actuated by said pressure operated mechanism, .an oscillatory control valve for the fluid under pressure, a link connecting` the alternating member andthe valve comprising two overlapping longitu-` dinally adjustable sections having sliding engagement with both the: alternating member and the valvel and also with each other,

`and a spring-common to the overlapping portions of both sections, tensioned by the relative adjustment of the sections under iniiuence of the alternation of the alternating member, the reaction of which spring acting through the engaged link section reverses the valve.

4. In a pulsator mechanism of the characatedmechanism operatesto alternately subject apair of pulsation conduits to variations of fluid pressure characterized by an alternating member actuated by said pres- .115, lter described, wherein a iiuid pressure actuL s l sure operated mechanism, an oscillatory conr trol valve for the fluid underpressure, a telej scopic link interposed between the `alternating member and the oscillatory valve and telescopically adjusted by themovement-of the reciprocatory member, and a spring lten-` sioned by both elongation and contraction of the telescopic link, the reaction of which reverses the valve in alternate directions.

la a pulsator mechanism@ the Characliao iro ter described, whereina fluid pressure actuated mechanism operates to alternately subject a pair of pulsation conduits to variations of fluid pressure characterizedby an alternating' member actuated by said pressure operated mechanism, an oscillatory control valve for the fluid under pressure, a link comprising two overlapping relatively7 movable sections, each section having a stop portion at its overlapped end, a slot in each section. evtending` beyond the overlapped portions, studs carried by the alternating member andthe valve member engaging through said slots which when moved one away from the other engage the ends of the slots to extend the overlapping link sections and when moved one toward the other engage the overlapping ends to likewise extend the sections and a` compression spring mounted intermediate the stop portions of the overlapping ends of the sections, and compressed by the relative movement of said sections in either direction which by its reaction will reverse the control valve.

6. A motion transmitting link comprising` two overlapping' slotted members having stop means at their overlapping ends, and a compression spring interposed between the stop means of the respective members, and relatively movable studs engaging in the slots of the respective members adapted by their relative adjustment to or from each other to extend said link against the tension of the spring.

7. A pulsator apparatus wherein a pulsator conduit is intermittently subjected to fluctuations of fluid pressure by operation of a fluid pressure actuated operating mechanism, characterized by an oscillatory valve yto be intermittently actuated controlling the action of the fluid under pressure an oscil latory control member having continuous alternating movementthe valve and control member being movable in intersecting paths of travel wholly at one side of a dead center position. the movement of the valve being 4limited'firstl in one direction and then in the other by the position of the control member until said control member approaches the limit of its stroke in either direction, and a spring tensioned by the movement of the control member in either direction which by its reaction =shifts the valve upon the movement of the control member out of the path of travel of the valve.

8. A pulsator lapparatus wherein a pulsatorconduitis intermittently subjected to fluctuations of fluid pressure by operationy of la. fluid pressure actuated-operating mechanism characterized by an oscillatory valve Vto beintermittently actuated controlling the action-of the fluid under pressure, an oscillatory control memberhavingcontinuous alternating movement, the valve and control member being movable in intersecting paths of travel wholly at one side of a dead center position, the movement of the valve being limited first in one direction andthen in the other by the position of the control member until .said control member approaches the limit of its stroke in either direction, anda compression spring compressed by the movement of the control member in either rdirection, the reaction of which will shift the valve when the control membe1l moves out of the path of travel of said valve.

9. A pulsator apparatus wherein a pulsator conduit is intermittently subjected to fluctuations of fluidpressure by operation of a fluid pressure actuated operating mechanism characterized by an intermittently operated oscillatory valve controlling the action of the fluid pressure and a continuously alternating oscillatory control member, moving in intersecting paths of travel wholly at one side of a dead center position. a. stop flange upon thecontrol member and a stop upon the valve engagingthe stop flange of the control member first on one side and then upon the opposite side and released to permit movement of the valve only as the control member approaches the limit of its stroke in either direction, and a spring tensioned by the movement of the control member to shift the valve when so released.

10. A pulsator apparatus wherein a pulsator conduit is intermittently subjected to fluctuations of fluid Ypressure by operation of a fluid pressure actuated operating mechanism characterized by an intermittently opera-ted oscillatory valve controlling the action of the fluid pressure and a continuously alternating oscillatory ycontrol member, moving in intersecting paths of `travel wholly at one side of a. dead center position, said control memberlimiting the movement of the valve until the controlmember approaches the limit of its stroke. and an actuating link connecting the control member and valve transmitting alternating push and pull impulses through the linkto said` valve, by which the valve is reversed atpredetermined points in the cycle of operation.

1l. In a pulsator mechanism wherein a pulsator conduit is subjected to intermittent fluctuations of fluid pressure by operation of a fluid pressure actuated operating mechanism, characterized by an oscillatory valve controlling the action of the fluid pressure, a reciprocatorypulsator valve, an oscillatory control member operatively engaged with the reciprocatory pulsator valve for oscillatory movement in unison therewith, an alternatingpush and pull link connecting the control memberand said fluid pressure control valve, which shifts the valve upon the approach of the pulsator valve to either limit of itsstroke.

12. In a pulsator apparatus, wherein a pulsator conduit is intermittently subjected llO to fluctuations of fluid pressure bv operation of a fluid pressure actuated mechanism including a reciprocatory piston and a pulsator valve movable in unison with the piston, characterized by a spline carried by the piston and engaging` in the under side of the pulsator valve to connect said parts in predetermined alined relation forunison movement. l

13. In a pulsator apparatus wherein a` pul-' sator conduit is intermittently subjected to fluctuations of fluid pressure by operation of a fluid pressure actuated mechanism including a reciprocatory piston and-a pulsator valve movable in unison with the piston, characterized by a substantially T-shaped connector carried by the piston and engaging` With the pulsator valve to maintain the valve in predetermined relative relation during the unison reciprocation of the piston and valve.

14. In a pulsator apparatus wherein a pulsator conduit is intermittently subjected to fluctuations of fluid pressure by operation of a fluid pressure actuated meuhanism including a reciprocatory piston and a pulsator valve movable inl unison with the piston.' characterized by a stud having a polygonal headengaging in a `corresponding` recess in the pulsator valve to maintainfthe valve in predetermined relative relation during the reciprocatory movement thereof.

l5. In a pulsator apparatus wherein a pulsator conduit is intermittently subjected to fluctuations of fluid pressure by opera` tion of a fluid pressure actuated mechanism including a reciprocatory piston and a pulsator Valve movable in unison with the pis ton, characterized by a connector engaged in the end of the piston stem and havingr a standing portion surmounted by an elongated head engaging in a corresponding recess in the valve to operatively connect the valve and piston for unison movement.

In testimony whereof, I have hereunto set my hand this 10th day of September A. D. 1922.

JOHN A. SCHMITT.

Witnesses E. B. SHUR'rs, J. P. BARLOWE.

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