US2208193A - Pneumatic displacement pump - Google Patents

Description

July 16, 1940 J. o. McMlLLAN PNEUMATIC DISPLACEMENT PUMP ENTOR Mf/V/ //a/7 ATTOR'N EY 3 Sheets-Sheet l Filed Deo.

July 16, 1940.- J. o. McMlLLAN 2,208,193

PNEUMATIC DISPLACEMENT PUMP Filed Dec. 10. 1936 5 Sheets-Sheet 2 INVENTOR ATTORN EY 3 ShveetS-Sheet 5 INVENTOR. James O /V-f/V//a/z ATTORNEY.

J. O. MCMILLAN PNEUMATIC DISPLACEMENT PUMP Filed Dec. l0, 1936 July 16, 1940.

Patented July 16, 194@ UNiTEp s'ilrss v.2,208,193 y PNEUMATIC DISPLACEMENT PUMP James 0. McMillan, Wichita, Kans., assigner of one-fourth to A. G. W. Biddle, Skiatook, Okla.

Application December 10, 1936, Serial No. 115,106

23 Claims.

This invention relates to pumps and more particularly to those of the pneumatic displacement through now of the liquid being lifted and to provide a substantially continuous ovv of liquid at the point of delivery.

In accomplishing these and other objects of the ZU invention, I have provided improved details of structure, the preferred forms of which are illustrated in the accompanying drawings, wherein: Fig. 1 is a vertical section through a Well or cistern equipped with a pumping apparatus em- `-55 bodying the features of the present invention.

Fig. 2 is an enlarged vertical section through the pump cylinder, particularly illustrating the valve mechanism.

Fig. 3 is a vertical section similar to Fig. 2 3U illustrating the float actuation of the control valve which effects power application of the hydrostatic pressure of fluid in the delivery line to a motive power cylinder.

Fig. 4 is a vertical section through the rupper pump head taken from the direction opposite that shown in Figs. 2 and 3 on the line iw-Il,` Fig. 5.

Fig. 5 is a plan view of the pump head particularly illustrating the arrangement of the iiow, pressure medium, and exhaust lines. Fig. 6 is a horizontal cross section on the line -B, Fig. 2.

Fig. 7 is a bottom horizontal cross section of the pump head on the line 1 1, Fig. 2.

Fig. 8 is a horizontal cross section on the line `s`-a, Fig. 3.

Fig. 9 is an enlarged vertical cross section illustrating a modified form of control valveat the lower end of the pump cylinder.

Fig. 10 is a horizontal section on the line Ill- I Il, Fig. 9..

Fig. 11 is a vertical section through a further modified form of pump showing its valve mechanism, and particularly illustrating float operation of the control valve which effects power applito provide a valve mechanism which is controlled cation of the hydrostatic pressure of fluid in the delivery line to a motor piston.

Fig. 12is a horizontal section on the line I 2--I 2, Fig. 11, particularly illustrating the float operated lever for actuating the control valve.

Fig. 13 is a horizontal section on the line I3- I 3, Fig. 11.

Fig. 14 is a horizontal section on the line I4-I4, Fig. 11.

Fig. 15 a vertical section through the upper pump head taken at right angles to the section shown in Fig. 11.

Fig. 16 is a horizontal section on the line IB-I 6, Fig. 11 through the upper cylinder head, particularly illustrating the motor piston for controlling inlet and exhaust of the pressure medium.

Referring more in detail to the drawings:

I designates a well or cistern containing a body of liquid 2 to be elevated under pressure` of an automatic pump 3 and discharged into a delivery 2o system 4 upon actuation of a faucet 5.

The pump 3 includes a cylinder 6 having upper and lower heads 1 and 8 closing the ends thereof to form a liquid receiving chamber 9 into which the liquid iiows under hydrostatic pressure and 25 from which the liquid is automatically displaced by a suitable pressure medium incidental to actuation of the faucet 5.

'I'he upper head l includes a body portion It having an air inlet chamber II and an air inlet needle valve I2 for closing a port I3 leading from the chamber Il to the chamber 9. 'I'he valve I2 is. mounted in a cage I4 formed in the body portion Ill and includes a needle member I5 having pin and slot connection I6 with an actuating rod I1 which in turn is engaged as at I8 with one end I 9 of a lever arm 2l) that is pivoted on a bracket 2| fixed to the ybottom face of the upper head '1. The lever arm 20, together with its function, will be more fully described later. Formed on the to lower end of the body portion I0 is a disk shaped cap or flange 22 preferably of the` same diameter as that of the cylinder 6 which is provided with an annular-cut-out portion 23 in its lower peripheral edge for receiving the upper end of the cylinder wall 6 whereby the head is retained in concentric position relative to the cylinder, a gasket ring 24 being inserted between the cap 22 and the upper edge of the 'cylinder to form a `pressure tight joint. Formed axially within the head I is a socket 25 having threads for engaging external threads of a discharge pipe 26 which depends within the cylinder 6 and has its lower end 21 threadedly engaged in a threaded opening 5 5 is threadedly engaged in a socket 28 of a check valve housing Z9 that is located in spaced relation to the bottom of the cylinder 6.

The lower head il includes a disk shaped cap 3] having an annular cut-out portion l3l in its upper face for receiving the lower edge of the cylinder 6 and which is sealed therewith by a packing ring 32 similar to the packing ring M of the upper head l.

Connected with the cap portion Sil of the head 8 is a depending sleeve 53 having an axial bore 3d for passing a stud The upper end of the stud 35 is threaded and engages with a threaded socket 36 of a check valve seat member 3? that is threaded into an opening 3i! in the bottom of the che-ck valve housing 29. l

The opposite end of the stud 35 projects from the sleeve 33 and mounts a draw-nut 3Q which is screwed into bearing contact with the lower end of the sleeve 33 to draw the heads l and 8 into sealing engagement with the ends of the cylinder 6 by means of the discharge pipe check valve housing 29 and check valve seat member 3l.

Formed on the nut 5S is a radially extending flange lll having an annularly shouldered seat Ail for seating the lower edge of a cylindrical screen l2 which has its upper edge seating against a similarly annularly shouldered seat iii formed on the cap portion 3S of the head When the nut 39 is in place, the cylindrical screen is retained thereby in xed concentric alignment with the sleeve 33 to form a filter through which liquid passes before entering the pump through an annular inlet port ed.

The annular inlet port extends through the cap portion of the head S in encircling relation to the sleeve 33, the rim portion of the head being connected with the sleeve by means of radial wings bridging the port as best illustrated in Fig. 2.

Formed about the inner and outer peripheries of the inlet port lll are ring like ribs l5 and il on the upper faces of the sleeve 33 and head 8 respectively, which form seats for a foot valve ring 38. The valve ring 58 is reciprocably mounted in concentric relation with the pump cylinder on guide wings fili vextending radially from a seat member 5t, the lower end of which at the upper end of the sleeve 35. Upward movement of the valve ring is limited by a lateral flange 5i on the upper end of the seat member overlapping the path of travel of the ring.

It is thus apparent that when the cylinder is submerged within the liquid 2, the liquid ows through the screen to unseat the foot valve i8 and iill the cylinder ii up to a level that is controlled by a float 52 slidable upon the discharge pipe 26.V

The liquid is thendischarged from the cylinder through the check valve housing by means of a suitable pressure medium that is delivered through a supply line 5t having its lower end connected to the-air inlet chamber il and havn ing its other end connected with a suitable source of pressure supply, not shown, at the top of the well.

Upon admission of the pressure medium into the cylinder B, the pressure causes seating of the yfoot valve i8 and displacement oi the trapped liquid through the check valve and pipe 255, the liquid entering the check valve housing through ports 56 thatare formed within the seat member 31 and through its seat 55 upon lifting of a check valve ring 56 which` normally valves off the 'ports 5d.

The check valve ring 56 is guided for reciprocation to and from its seat by a pintle 5l depending from the head of a fitting 58 that is screwed into lug formed as a part of the check valve housing and having arms 5B for supporting the lug 59.

Upon continued admission of the air to the cylinder S, the liquid is forced upwardly through the pipe 25through a ley-pass port El in the head l', Figs. 4 and 5, and into a delivery pipe 62 leading to the top of the cistern and connected with the supply system through a pressure chamber 63.

The pressure chamber 63 has an air dome therein to provide for continuous iiow of water therethrough upon variation in the pressure medium supply and particularly during the interval between the time the cylinder is lling and when the pressure medium is displacing the liquid from the cylinder as later described.

Extending through the upper side of the lug 59 is an opening Se for mounting the lower end of a tube @5 having its upper end screwed into a boss 65 of the head l' to communicate with a passageway 6l, as best shown in Fig. 4, which leads to a control cylinder 69 for the admission of pressure medium to the cylinder E through the air inlet chamber Il.

The lower end of the tube t5 is sealingly engaged with the opening @il by means of a washer I l0 encircling the projecting end of the tube and retained in seating engagement with the top of the socket 'li by the tting 58. The tting 58 has a' recess l2 communicating with the lower end of the tube and is provided with lateral ports I i3 leading to a lateral passageway lll formed in the lug 59.

The passageway lll communicates with a passageway extending upwardly at right angles thereto tothe top of the check valve housing; the passageways lil and l5 being formed by drilling into the check valve housing. Plugs 'i1 are threaded into the housing to seal'the holes left by the drill.

Mounted in the upper end of the check valve housing in alignment with the passage l5 is a cylindrical insert i8 which extends slightly above the top of the housing. The check valve housing is also provided with an upwardly -extending bracket arm 'i9 for pivotally mounting a lever arm 86, as at 8|, which consists of a ring -82 loosely engaged about the pipe 26 in the nature of a yoke, the outer end of the lever terminating in an outwardly and downwardly curved arm 83 adapted to be engaged by the lower end of the float 52 as later described.

The inner end of the lever arm is provided with a valve member 84 which consists of a housing 85 sleevable over the insert I8 of the check valve housing and a valve head limountedin the housing and engageable over the upper end of the passage 'l5 to valve olf the passageways 14 and l5. A cushion 87 is also provided to eii'ectively seal the opening of the passage 'l5 together with a spring 88, the ends of which are respectively xed to the check valve housing and leverarm for normally retaining the valve in closed position. The center portion of the spring 1s extended over the valve housing for normally raising the lever arm.

The float 52 previously referred to is constructed of molded material of relatively light weight to float upon the liquid admitted to the cylinder and carries a compressible bumper washer 89 on its upper end adapted to engage against a lever 'Q5 arm when the iioat isy in its uppermost position to actuate the lever to eiect'operation of' air inlet control valves. v

When the float falls with the emptying of water from the cylinder, the lower end of the float engagesthe cam end 83 of the lever 80 to cause opening of the valve 84 and admission of water from the cylinder past the valve through the pas- -sageway 'I5 to the passageway 'I4 and pipe 65 to act against apiston 92, Fig. 4, in the motive power ycylinder 09 of the' head 'I to eiect closing of the air inlet valve I2 through a lever assembly 93, now tobe described.

The lever assembly 93 is clearly illustrated in Fig. '7 and consists of the bracket 2| previously described in connection with the air inlet valve that is xed to the head 1, the yoke end I8 thereof pivotally engaging the needle valve I2'to cause its reciprocation as the lever is moved. The lever arm 20 is formed as a part of the pivoted arm 94 and extends .at right angles thereto onone side of the delivery pipe 26 to a point directly beneath the motive power cylinder 09, where it is broadened as at 95, and provided with an opening 9B for the passage of an exhaust valve pin 97 which is pivoted thereto by the pin 90. The broadened portion of the lever is provided with a right angularly extending arm 90 through which a bolt 99' is extended for mounting the curved lever arm I00 which extends reversely to the arm'20 on the y opposite side of the pipe 26. The exhaust valve pin mounts an exhaust valve |02 (Fig. 4) engageable with the under face of the head 1 to cover the exhaust port and also mounts a piston rod |03 which is threadedly mounted on the pin and which extends through the port |04 into the motive power cylinder 69 to mount the piston 92 on a reduced threaded end |06 of the rod |03. A coil spring |01 is mounted on the rod |03 between the piston 92 and the bottom face |00 or the power cylinder to normally maintain the piston in raised position and the exhaust port closed, the piston being retained on the rod IES by a nut |09 threaded on the threaded upper end of the piston rod.

It is thus apparent that when liquid from the cylinder 6 acts against the piston 92, the piston lis forced downwardly to open the exhaust port |04 and close the air inlet valve I2 through the common pivot` point IIO of the valves. Then since the supply of air pressure is cut off the pressure in the cylinder may escape through the exhaust port |04 to be vented by a vent I I I, formed in a plug I I2 closing the top of the motive power cylinder to permit the spring to raise the piston.

In order to hold the air inlet valve I2 seated in closed position until the cylinder 6 has been relled with liquid, I provide the head 'I with a latch mechanism- II3 particularly illustrated in Figs. 2 yand 3. The latch mechanism is slightly offset from the piston 92 and is in the same vertical 'plane as the air inlet valve and liquid outlet as shown in Figs. 6 and 7 and consists in part of a sleeve I I4 mounted in the bottom face oi the head 'I and has a vertically lextending bore IIE, which is enlarged at its lower end to form a shoulder IIB on the sleeve. The shoulder H0 is adapted for engagement by a latch pin II'I vmounted on a lug |I8 of the lever arm |00 eccentrically of the bolt which pivots the lever arm. lWhen the lever 94 is in downward position the lug causes the pin II'I to be drawn inwardly due to the pivotal movement thereof to cause the pin toseat on the shoulder and thus retain the valve I2 4in closed position, When the lever arm is in 4upward position, 'kick it off `the shoulder, further ment of the lever arm |00 forcing the pin into the sleeve to permit unseating of the air inlet valve.

the pin is forced outwardly to upward move- In order to effect automatic functioning of the valves," it is necessary to provide a pressure outlet from-the cylinder 6. This is accomplished by the outlet IIS (Fig. 5) which communicates with the bottom of the motive power cylinder 69 as `shown` at II1 in Fig. 4 on the side of the latch mechanism opposite the piston I3, as shown in Fig. 6. I I

It is.. thus apparent that when the exhaust portY is open and the inlet valve closed, pressure medium in the cylinder 0 enters the power cylinder 69 through the port I04 and seeking the line of least resistance passes along the bottom of the cylinder 09 to the outlet IIB', in such a manner that pressure is relieved below the piston to per- `mit closing of the air inlet valve I2.

In installing the equipment, the pump cylinder is submerged in the body of liquid t0 a suicient depth to`provide the required hydrostatic head to eiect actuation of the piston 92 against' the pressure medium-actingon the valve `I2 and also effect proper filling of the cylinder. A sufficient length of pipe I I9 is connected with the `exhaust port so that it will extend a suitable distance above `the level of liquid carried in the well.

The line 53 supplying the pressure medium is connected with a suitable source of supply and the delivery line 02 is connected with the dis- 'pensing system 5 through the air chamber 63.

IThe well uid will enter the pump cylinder through the screen 42 and lift the foot valve ring to viill the cylinder 0; Pressure medium is then turned into the line 53 which causes opening of the air inlet valve since the hydrostatic pressure upon the piston due to the fact that the oat lwhich rises upon filling of the cylinder permits closure of the control valve |02. Pressure medium will then flow from the valve chamber into the cylinder through the port |331..

.trol valve lever, whereupon the control valve -lever will be moved downwardly to eifect open-z ing of the control valve which allows a portion 0f the liquid in the cylinder to enter the passageways 'F5 and 74, for flow through the tube 65 to the passageway 01 to act against the piston 92 thus establishing pressure on the piston to close the vair inlet valve for cutting olf the supply of pressure medium, pressure in the cylinder being vented to atmosphere through the air' outlet I I9.

Upon relief of the pressure within the cylinder. the check valve ring 56 seats dueto the static head of fluid in the delivery pipe and the foot valve 48 opens to allow a new supply of liquid to enter the cylinder from the Well.

The oat then again rises with the level of the liquid until the upper end thereof engages the.

of the fluid in the discharge pipe is not acting aio in the cylinder in the same manner as previously described to begin another cycle of operation 0f the pump. These cycles will continue until the system is completely filled. During the filling of pressure medium being held within the pump cylinder the air chamber 63 will cause substantially continuous flow in the system even Vthough the pump is intermittently operated.

When the system is full and the faucet 5 is opened, the pump starts operation and when the faucet is shut 01T the pump ceases operation, the the cylinder until the faucet 5 is again opened. f

In the form ofthe invention illustrated in Figs. 9 and 10, I show a modified form of control .valve in' the check valve housing.

In this construction the control valve |23 consists of a valve head |2| mounted in an arm |22,

the head covering a passage |23 leading to a tube |24 which in turnleads to the motive power cylinder at the top of the cylinder 6. The arm |22 is mounted in xed position by the pin |25 on the rod |26 connecting the arm |22 with a lever arm |21 similar to the lever arm 80 in the preferred form of invention with the exception that the valve end of the lever arm extends into'the upper end of a compartment |23 formed integrally with the check Avalve housing, and pivots in the check valve housing in response to the weight of the `float and upward pull of a rod |30 connected to the arm |27 as at |3| to respectively open and close the control valve |26.

It is apparent, however, that with minor alterations, for example, 'by eliminating the pull rod |33, the modified form of pump vmay be applied to the motive power cylinder illustrated in the preferred form of invention.

In the form of invention illustrated in Figs. 1l to 16, inclusive, I have provided a species of air inlet chamber |32, valve chamber |33, motive power chamber and mechanism |34, and control valve assembly |35, the remaining construction of the invention being substantially similar to that described in the preferred form of invention.

In order to prevent foreign matter of any detrimental size to pass from the Aair supply line |35 into the cylinder I3?, the inlet chamber is equipped with a strainer |33 shown as comprising a coil spring having its upper end seated within the inlet opening of the chamber and having its lower end seated against .a plug |39 .closing theopposite end of the chamber. It is thus apparent that the air is delivered from the line |33 to the interior of the spring for flow between the coils thereof which expand suiiiciently to permit passage of a large quantity of air but which prevents passage of foreign matter. Upon passing the screen the pressure medium is delivered into the valve chamber |33 through a'port |43 and from the valve chamber through a port in the Ybottom thereof into the cylinder |31 to act against `the -liquid collected therein.

2,208,193 Pressure within the piston cylinder is relieved When the cylinder has become emptied, it is necessary to .shut oi the air supply and to vent the cylinder to atmosphere through the valve chamber |33which communicates with an exhaust pipe |4| having its lower end threaded into the motive power chamber |42 and its upper end extending above the level of liquid within the cistern or well.

The port |40 is provided with a valve |43 that is actuated by the motor mechanism |34 under control of the hydrostatic head of fluid flowing through the pipe |44.

The motor mechanism |34 includes an insert housing |45 having a shouldered end |46 sealingly engaged in an opening formed in the side wall of the chamber |33. The opposite end of the insert is mounted in an aligning opening formed in the side of the head in axial alignment with an exhaust chamber |49. The screw threaded cap |5|lhas an inwardly extending flange |5| adapted to abut against the end of the insert to retain the insert in position as shown in Fig. 1l.

Formed within the insert and opening from the direction of the cap |53 is a piston cylinder |52 having its cuter end communicating with a passageway |53 through notched openings |54 formed in the flange portion |5| of the cap.v

Locatedin the opposite end of the insert is a recessed chamber with the valve chamber |33 and with the exhaust chamber |49 throughradial ports |51 to form an exhaust passageway through which pressure medium` is exhausted from the pump cylinder |31 to allow rell thereof as later de-.

scribed.

The recessed chamber |55 and cylinder |52 are separated by a diaphragm |58, Fig. 16, having an axial opening in which is slidably mounted a valve stem 59 for the valve |43 and an exhaust valve |63, the latter valve being adapted to close the exhaust port when the port |43 is opened to allow admission of pressure medium to the cylinder |3'i.

The valve is preferably'formed as a part l of the valve stem or tie rod |59 extending through a .cup plate which abuts against the head of the valve |43 and through a valve'washer ISI which cooperates with thel Valve cup in retaining a compressible valve ring therebetween. Sleeved over the rod and extending through the bearing opening of the diaphragm in the insert is a sleeve |62 having one end abutting against the valve washer |6| and its opposite en-d against a piston |63 that is slidably mounted in the cylinder |52.

rIhe tie rod extends through the center of the piston and has .a threaded outer end for mounting a nut which is screwed thereon to clamp the piston against the end of the sleeve so that the valves and unit.

It is thus obvious that when pressure is admitted to the `passageway |53 it acts directly against the piston to move the piston to the left to cause closing of the valve portl4l).

The effective area of the valve |43 is materially lessthan that of the eective area of the piston, so that the pressure of liquid acting on the piston to seat the valve need be a small amountl to close the valve |43 againstthe high lpressure medium admitted through the line |35.

In-order-that the piston may be moved to the right under influence of the pressure medium acting-against the effective portiouof yIthe Valve L |55 communicating directly -:k

|43, the piston is provided with a port |64 extending therethrough to the interior of the cylinder which in turn is vented to the exhaust chamber through a port |65 in the Wall of the cylinder.

When the supply of pressure medium is shut oil from the motor, pressures on the respective sides of the piston will become equalized through ilow of iiuid through the port |65.

When the pressures approach equalization, the pressure acting against the valve |43 Ypreponderates to cause opening of the inlet valve and seating of the exhaust valve against the seat or" the exhaust port to again re-establish flow of pressure medium into the pump cylinder- In order to prevent leakage of pressure medium .u through the exhaust port while the valves are moving to and from seating position, the exhaust port is closed before the inlet port becomes eective. Toacomplish this, the valve |43 carries a pilot portion iiii'having sliding t within the port which retains the port closed until the valve washer 6| has entered and closed oi the exhaust port.

Likewise, when the valves are moved in the opposite direction under iniiuence of the liquid actingagainst theipis'ton |69, the valve washer ||i| prolongs full opening movement of the exhaust valve until the pilot has entered the inlet port.

In order to positively actuate the piston |63, I employ the hydrostatic head'of fluid moving through the discharge pipe |44 which is intermittently admitted to the piston under control of the float member |01 as now to be described.

The lower inlet portion |68 of the pump is similar to the preferred form of invention. A

check valve housing |69is provided, however,` which has an inwardly extending lug |10 for l mounting a tube |1| inr communicating relation to av laterally extendingpassage |12.

ExtendingV at right angles'to the lug |10 in l Patentis:

parallelrelation with the axis of the cylinder |31 is a bore |13 for receiving a valve housing |14. The valve housing |14 includes a cylini drical'body having a shouldered lowerend |15 seated in the bottom of the bore and extending f through the lower face ofthe lug. The upper end of the valve housing is threadedly retained -inzthe bore and has a head |10 engaging the upper end of the check Valve housing.

The valve housing is provided at its upper end with an axial bore to guidingly mount a head |11 of a valve |18 and at its lower end with an aligning bore |19. `Thevalve |18 includes `vertically spaced concentric bevelled annular seating surfaces |80 and |8| of dilierential size adapted to respectivelyengage seats |82 and |83 at the respective ends of the bore |19. Communicating with the bore |19 between the respective valve seats are radial ports |84, Fig. 13, connected with the passageway |12 leading to the radial ports |85 within the fitting |86 of the tending longitudinally of the pipe |44 and which.

terminates at the upper end of the pipe in a ring |9| slidably engaging the pipe. The outer` end'of the actuating lever terminates in anarm |92 which isladapted to be engaged by the lower through the tube |1| to act against the piston |63 to close the air inlet valve port |40.

Due tothe differential area of the piston and valve |43, the piston will be movedto the left to effect closure of the =port |40. During this movement` of the valve, none ofthe. pressure medium will escape through the exhaust valve, because the pilot |66 ofthe valve closes the port |40 before the valve washer ||i| has opened the` exhaust port. i-

At the time the valve |43 engages its seat to close theport. |40, the valve washerhas cleared the exhaust port to allow pressure in the cylinder to be vented to atmosphere through the ports |51 into the exhaust chamber and through the exhaust pipe` |4|. Upon relief of pressure within the cylinder |31, the hydrostatic head of liq-` uid in the delivery pipe closes the check valve |93 and the ioot valve |04 opens to refill the cylinder from the well.

The oat then rises until it engages the ring |9|` to ,lift the lever arm |89 and close the valve |18 to relieve hydrostatic pressureon the piston |63. 4The exhaust ports |64 and |65 relieve the piston Vcylinder of pressure in such a manner that pressure medium from the inlet line blows the valve` |43 open t'o admit air to the pump cylinder, the exhaust valve closing at that timev to prevent escape of pressure medium through the exhaust pipe and `another cycle of operation is thus begun. a

What I claim and desire vto secure by Letters f1". In an apparatus of the character described,

a liquid receiver, liquid delivery means connected with the receiver; a sourceof pressure medium for supplying pressure to displace the liquid from the receiver, means for controlling admission of said pressure medium, means responsive to pressuresin the receiver for actuating said control means, latch .means engaged with, said controlmeans for maintaining the control means in closed condition, and means responsive to level of liquid in the receiver engageable with the latch means for permitting the control means to open.

2. In an apparatus of the character described, a liquid receiver, liquid delivery means connected with the receiver, a source of pressure medium for supplying pressure to displace the liquid from the receiver, a pressure exhaust duct `connected with the receiver, means for controlling admission of said pressure medium, means for closing said exhaust duct, apiston cylinder connected with said receiver, `a piston in the cylinder, a lever assembly in the receiver connectingV the piston with said 'control and exhaust closing means, means for supplying liquid from the receiver to actuate the piston, a valve in the supply means, `and a oat in the receiver engageable with the lever assembly and the valve to alternately apply pressure of the liquid and pressure medium to said piston for regulating supply of said pressure medium to the receiver andexhaust pressure medium from the receiver.

3. In an apparatus of the character described, a liquid receiving cylinder; a foot valve for admitting liquid to said cylinder; a delivery duct forA discharging` liquid from said cylinder; a

' check valve for said delivery duct; means for `actuatingisaid exhaust valve in response to pressuresuin saidV liquid receiving cylinder; a `lever assembly connecting said inlet valve, latch and exhaust valve; a floatin'said cylinder engageable with said lever assembly to release the latch for permitting the piston to open the inlet valve and close the exhaust valve; a tube communicating with said motive power cylinder andy liquid receiving cylinder; a valve for said tube; and a lever for actuating said tube valve in response to weight of the float, whereby pressure medium Lin the cylinder is transmitted to said motive a liquid receiving cylinderLa foot valve for ad# 30` ,power cylinder for acting on said piston to cooperate with said lever assembly in actuating said valve.

4. In an apparatus of the character described,

mittingliquid to said cylinder; a delivery duct for discharging liquid from said cylinder; a check valve housing having a valve for said delivery duct; means for supplying `pressure medium to said cylinder for displacing liquid therefrom through the delivery duct; an inlet valve for said pressure medium supply means; a latch for said inlet valve; a motive power cylindermounted on said liquid receiving cylinder having an exhaust valve; a piston in said motive power cylinder for actuatingY said exhaust valve in response to presltures in said liquid receiving cylinder; a lever 'assembly in the cylinder connecting said inlet valve, latch and exhaust valve; a float in said' .cylinderv engageable with said lever assembly for cooperating with the piston to release the latch, open the inlet valve and close the exhaust valve'; a tube connecting said check valve housing and power cylinder; a' valve in said check valve housing for said tube; and a lever engageable with said float for actuating said tube valve in response to weight of the float, whereby pressure medium in the cylinder is transmitted to said motive power cylinder` for acting on said piston to cooperate with said lever assembly in actuating said latch andvalves.

5. In an apparatus of the character described, a liquid, receiving cylinder, a foot `valve for admitting liquid to said cylinder; a delivery duct v for discharging liquid from said cylinder; a check valve for said delivery duct; means for supplying pressure mediumnto said cylinder for displacing liquid therefrom through the delivery duct; an inlet valve for said pressure medium supply means; a latch for said inlet valve; an exhaust valve for said cylinder; a motive power cylinder mounted on said liquid receiving cylinder; a piston in said motive power cylinder for actuating said exhaust valve in response to pressures in said liquid receiving cylinder; a lever assembly in the liquid receiving cylinder connecting said inlet and Aexhaust valves and latch; and a iioat in said cylinder engageable with said lever assembly to release the latch rfor permitting the piston to actuate the inlet and exhaust valves. f 6; In an apparatus of the character described,

i therein and engageable with the latch member for releasing the same to permit opening of the inlet valve to admit pressure iiuid to the receiving member and to close said pressure fluid outlet valve for discharging liquid from said receiving member through said liquid outlet.

7. In an apparatus of the character described,

liquid receiving means, means for admitting liquid to said receiving means, means for clischarging liquid from said receiving means, means for supplying pressureuid to said receiving means for displacing liquid therefrom through the discharge means, an inlet valve for admitting pressure iiuid to the receiving means, a latch for said inlet valve, an exhaust valve for exhausting pressure fluid from said receiving means, a fluid motor communicating with the receiving means and controlling said exhaust and inlet valves, a lever assembly connecting said inietrand exhaust valves and latch, and means in said receiving means engageable with said lever assembly for releasing the latch to permit actuation of said valves.

8. An apparatus of the character described Vincluding a pump chamber having a valved liquid pump chamber engageable with the lever arm in response to rise in level of liquid therein and cooperable with the arm and with pressure fluid vapplied to the inlet valve for .releasing the latch to permit opening of the inlet valve and closing of' the outlet valve to discharge liquid from the pump chamber.

' 9. An apparatus of the character described in cluding a pump chamber having a valved liquid inlet and a liquid outlet line, a pressure fluid inlet compartment communicating with the pump chamber, a pressure fluid inlet valve controlling communication between Ythe inlet compartment and said pump chamber, a iiuid motor cylinder, a piston sildably rmounted in saidcylinder having al piston rod, a pressure uid outlet communicating with said pump chamber and motor cylinder, a pressure iiuid `outlet valve on the piston rod controlling communication between the pump chamber,v motor cylinder and pressure fluid outlet and controlling exhaust of pressure uid from said pump chamber, said piston rod being connected with said inlet and outlet valves and alternately maintaining the compartment and pressure duid outlet in closed and open condition respectively relative to the pump chamber, a duct leading from the pump chamber to the iiuid motor cylinder to permit pressure fluid in the pump chamber to act on said piston for actuating said h ETH' compartment communicating with the pump chamber, a pressure fluid inlet valve controlling communication between the inlet compartment and said pump chamber, a iiuid motor cylinder, a piston slidably mounted in said cylinder having a piston rod, a pressure fluid outlet communicating .with said pump chamber and motor cylinder, a pressure iluid outlet valve on the piston rod controlling communication between the pump chamber, motor cylinder and pressure uid outlet and controlling exhaust of pressure fluid from said pump chamber, said piston rod being connected with said inlet and outlet valves and alternately maintaining the compartment and pressure iiuid outlet in closed and open condition respectively relative to the pump chamber, a duct leading from the pump chamber to the fluid motor cylinderv to permit pressure fluid in the pump chamber to act on said piston for actuating said valves, means in the pump chamber controlling admission of fluid to said duct, said duct controlling means including a valve housing `in said pump chamber enclosing the lower ends of said duct and the liquid outlet line, a check valve in said housing admitting liquid to said outlet line. a valve in said housing controlling admission of pressure Vfluid within the housing and liquid in the outlet line to the lower end of said duct, a lever member mounted within said housing supporting said duct valve and having a portion extending outwardly of said housing, and means in the pump chamber respon-sive to level of liquid in the chamber engageable with said outwardly extending portion of said lever member upon fall of the liquid level in the chamber for opening said duct valve to permit application of fluid pressure to said motorpiston,

11. An apparatus of the character described including a pump chamber having a valved liquid inlet and a liquid outlet line, a pressure uuid inlet compartment communicating with the pump chamber, a pressure fluid inlet valve controlling communication between the inlet compartment and said pump chamber, a uid motor cylinder, a piston slidably mounted in said cylinder having a piston rod, a pressure fluid outlet communicating with said pump chamber and motor cylinder, a pressure fluid outlet valve on the piston rod controlling communication between the pump chamber, motor cylinder and pressure fluid outlet and controlling exhaust of pressure fluid from said pump chamber, said piston rod being connected with said inlet and outlet valves and alternately maintaining the compartment and pressure uid outlet in closed and open condition respectively relative to the pump chamber, a duct leading from the pump chamber to the fluid motor cylinder to permit pressure fluid in the pump chamber to act on said piston for actuating said valves, means in the pump chamber controlling admission of fluid to said duct, said duct controlling means including a check valve housing in said pump chamber enclosing the lower ends of said duct and the liquid outlet line, a check valve in said housing admitting liquid to said outlet line, a lug in said housing supporting the lower `end of said duct and having a passageway therethrough, a duct valve housing in said check valve housing having a bore extending through said lug and communicating with said lug passageway, a valve slidably mounted in said bore controlling entrance of fluid to said passageway, a lever mounted exteriorly of the check valve housing engaged4 with said duct valve, a float in said chamber engageable with said lever upon fall of level of liquid in the chamber for actuating the valve to close oi said duct, and means in the chamber connected with the lever and engageable by the float upon rise of liquid level in the chamber for actuating the lever to open said duct to the passage of fluid to operate said motor piston.

12. In a compressed air pumping mechanism, the combination with a closed cylinder having an inlet for liquid, an inlet for compresse-d air and an outlet for exhaust air, of an inwardly opening check valve for closing said liquid inlet, a valve for closing said air inlet, a valve for closing said air outlet, means by which when either of said last named two valves opens the other closes, liquid discharge means having in the lower portion of said cylinder a liquid intake, an inwardly opening check valve for closing said liquid intake, a chamber, a piston reciprocative in said chamber and engaging and movable with said air outlet valve and, when moved in one direction, moving said air outlet valve to the open position, a liquid conductor communicating with said cylinder in the lower portion thereof and with said chamber at the end of said piston distant from said air outlet valve, whereby liquid entering said chamber through said conductor will move said piston in said direction,

thus opening' said air outlet valve and closing 'J said air inlet valve,` means for automatically locking said air inlet valve and said air outlet valve respectively closed and open when they are moved to said positions, a valve normally closing said conductor, and a float carried by the liquid in said cylinder and, when the liquid lowers to a predetermined level, engaging and opening said conductor closing valve, whereby liquid will pass from said cylinder through said conductor into said chamber and will move said piston in said direction, thus opening said air outlet valve and closing said air inlet valve, said float, when the liquid rises in said cylinder to a predetermined level, engaging and releasing said locking means, permitting said air inlet valve to open and said air outlet valve to close, upon which compressed air entering said cylinder through said air inlet will force liquid from said cylinder out through said discharge means.

13. In a compressed air pumping mechanism, the combination with a closed cylinder having an inlet for liquid,` an inlet for compressed air and an outlet for exhaust air, of an inwardly opening check valve for closing said liquid inlet, a valve for closing said air inlet, a valve for closing said air outlet, means by which when either of said last named two valves opens the other closes, liquid discharge means having in the lower portion of said cylinder a liquid intake, an inwardly opening check valve for closing said intake, a chamber, a piston reciprocative in said chamber and engaging and movable with said air outlet valve and, when moved in one direction, moving said outlet valve to the open position, a liquid conductor communicating with said cylinder in the lower portion thereof and with said chamber at the end of said piston distant from said air outlet valve, whereby liquid entering said chamber through said conductor will move said piston in said direction, thus opening said air outlet valve and closing said air inlet valve, means for automatically locking said air positions, a valve normally closing said conductor,

releasing said locking means, and means operative when said locking means is released for opening said air inlet valve and closing said air outlet valve, upon which compressed air entering said cylinder through said air inlet will force liquid from said cylinder out through said discharge means.

14. In a compressed air pumping mechanism, the combination with a closed cylinder having a liquid inlet, an inlet for compressed air and an outlet for exhaust air, of an inwardly opening check valve for closing said liquid inlet, a valve which opens toward said cylinder for closing said air inlet, a valve for closing said air outlet, means by which when either of said last two named valves opens the other closes, liquid discharge means having in the lower portion of said cylinder a liquid intake, an inwardly opening check valve for closing said intake, means automatically locking said air inlet valve and said air outlet valve respectively closed and open when they are moved to said positions, a iloat carried by the liquid in said cylinder, and means operative when said float lowers to a predetermined position for forcing said air outlet valve to the open position and said air inlet valve to the closed position, upon which liquid will enter said cylinder through said liquid inlet, said iioat, when the liquid in said cylinder rises to a predetermined level, engaging and releasing said locking means, permitting said air inlet valve to open and said air outlet valve to close, upon which compressed air entering said cylinder through said air inlet will force liquid from said cylinder through said discharge means.

l5. In a compressed air pumping mechanism,

* the combination with a closed cylinder having a liquid inlet, an inlet for compressed air and an outlet for exhaust air, of an inwardly opening check valve for closing said liquid inlet, a valve which opens toward said cylinder for closing said air inlet, a valve for closing said air outlet, means by which .when either of said last two named valves opens the other closes, liquid discharge means having in the lower portion of said cylinder a liquid intake, a iloat carried by the liquid in said cylinder, and means releasable by said iloat when the liquid level in said cylinder rises to a predetermined level for automatically locking said air inlet valve and said air outlet valve respectivcly in the closed and open positions when said air inlet valve and said air outlet valve are moved to said positions.

i6. In a compressed air pumping mechanism, the combination with a closed cylinder having a liquid inlet, an inlet for compressed air and an outlet for exhaust air, of a valve which opens toward said cylinder` for closing said air inlet, a valve for closing said air outlet, means by which when either of said valves opens the other closes, liquid discharge means having in the lower portion oi said cylinder a liquid intake, a float carried by the liquid in said cylinder, and means releasable by said iloat when the liquid in said cylinder rises to a predetermined level for automatically locking said air inlet valve andr -said air outlet valve respectively in the closed and open positions when said valves are moved to said positions.

17. In a compressed air pumping mechanism, the combination with a closed cylinder having a liquid inlet, an inlet for compressed air and an outlet for exhaust air, of a valve which opens toward said cylinder for closing said air inlet, a valve for closing said air outlet, means including a lever fulcrumed intermediate of and engaging said valves by which when either opens the other closes, liquid discharge means having in the lower portion of said cylinder a liquid intake, a float carried by the liquid in said cylinder, and means releasable by said float when the liquid in said cylinder rises to a predetermined level for automatically locking said lever so as to hold said air inlet valve closed and said air outlet valve open when said valves are moved to said positions.

18. In a compressed air pumping mechanism, the combination with a closed cylinder having a liquid inlet, an inlet for compressed air and an outlet for exhaust air, of a valve which opens toward said cylinder for closing said air inlet, a valve for closing said air outlet, a lever connectand fulcrumed between said valves by which when one opens the other closes, and locking means carried by said lever for automatically locking said lever, with said air inlet Valve closed and said air outlet valve open, from movement when said valves respectively are moved to said positions.

19. In a compressed air pumping mechanism, the combination with a closed cylinder having a liquid inlet, a liquid outlet, an inlet for compressed air, and an outlet for exhaust air, of a valve which opens toward said cylinder for closing said air inlet, a valve for closing said air outlet, means by which when either of said valves opens the other closes, a oat carried by the liquid in said cylinder, and a locking member which automatically moves to the locking position and holds said air inlet valve closed and said air outlet valve open when said valves respectively move to said positions, said locking member being engaged and released from its locking position by said float when said float rises in said cylinder to a predetermined position,

20. In a compressed air pumping mechanism, the combination with a closed cylinder having a liquid inlet, a liquid outlet, an inlet for compressed air and an outlet for exhaust air, of a valve which opens toward said cylinder for closing said air inlet, a valve for closing said air outlet, a lever connecting and fulcrumed between said valves by which when either of said valves opens the other closes, a float carried by liquid in said cylinder, and a locking member automatically movable on said lever to a locking position in which said air inlet valve will be locked closed and said air outlet valve will be locked open, said locking member being engaged and moved to a release position by said iloat when said float rises to a predetermined position.

2l. In a compressed air pumping mechanism, the combination with a closed cylinder having a liquid inlet, a liquid outlet, an inlet for compressed air and an outlet for exhaust air, of a valve which opens toward said cylinder for closing said air inlet, a valve for closing said air outlet, means by which when either of said valves opens the other closes, a oat carried lby the liquid in said cylinder, and a pivoted locking member automatically movable to a locking position in which it will hold said air inlet valve closed and said outlet valve open when said valves respective- 1y move to said positions, said float engaging and swinging said locking member to a release position when said float rises to a predetermined position.

22. In a compressed air pumping mechanism, the combination with a closed cylinder having a liquid inlet, a liquid outlet, an inlet for compressed air, and an outlet for exhaust air, of an inwardly opening Valve for closing said air inlet, a valve for closing said air outlet, means by which when either of said valves opens the other closes, a float carried by the liquid in said cylinder, a chamber, a piston reciprocative in said chamber and engaging and movable with said air outlet valve, and, when moved in one direction, moving said air outlet valve to the open position, a liquid conductor communicating with said cylinder in the lower portion thereof and with said chamber at the end of said piston distant from said air outlet valve, a valve normally automatically closing said conductor and engaged and moved to the open position by ysaid float when said float lowers to a predetermined position, whereby liquid will pass from said cylinder through said conductor into said chamber and will move said piston in said direction thus moving said air outlet valve to the open position and said air inlet valve to the closed position, and'means releasable by said 4iloat on its upward movement for locking said air inlet valve closed and said air outlet Valve open.

23. In a compressed air pumping mechanism,

the combination with a closed cylinder having a liquid inlet, a liquid outlet, an inlet for compressed air, and an outlet for exhaust air, of two valves respectively closing said air inlet and said air outlet, means by which when either of said valves opens the other closes, a float carried by liquid in said cylinder, a chamber, a piston reciprocative in said chamber and engaging and movable with said air outlet Valve, a liquid conductor communicating with the lower portion of said cylinder and with said chamber, a valve normally automatically closing said conductor and engaged and moved to the open position by said float when said float lowers to a predeterlrnined position, whereby liquid will pass from said cylinder through said conductor into said chamber and move said piston to a position in which it will open said air outlet valve and close said air inlet valve, means for moving said piston in the opposite direction so as to close said air outlet valve and open said air inlet valve,land means releasable by said float on its upward movement for locking said air inlet valve closed and said air outlet valve open.

JAMES O. MCMILLAN.

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