US2692704A

US2692704A - Pneumatically operated liquid pump

Info

Publication number: US2692704A
Application number: US135204A
Authority: US
Inventors: Cyril C Benz
Original assignee: Individual
Current assignee: Individual
Priority date: 1949-12-27
Filing date: 1949-12-27
Publication date: 1954-10-26
Anticipated expiration: 1971-10-26

Description

Get. 26, 1954 c, c, BENZ 2,692,704

PNEUMATICALLY OPERATED LIQUID PUMP Filed Dec. 27. 1949 4 Sheets-Sheet J.

/NVENTO/?.

CYRIL C. Be/vz BY HIJ flTT RNEYS. HARE/.iK/Ecb; Fosrz/e & HARRIS fly Oct. 26, 1954 c, Q BENZ 2,692,704 PNEUMATIQALLY OPERATED LIQUID PUMP Filed Dec. 27, 1949 4 Sheets-Sheet 2 C I /07 BY ATTORNEYS.

HA RRIS, /(/z-: Fosrse a HH R215 0 v Oct. 26, 1954 C; c. BENZ PNEUMATICALLY OPERATED LIQUID PUMP 4 Sheets-Sheet 4 Filed Dec. 27. 1949 BY HIS ATTORNEYS. HA RR/S, Knscu, Fos T: & Hn RIF/5 6v 7 Patented Oct. 26, 1954 UNITED? sTA rEs ea'reu'rf OFFICE? PNEUMAT-IGALLY DRERATED LIQUID Cyril C. Benz, Los Angeles, Calif.

Applicaticn'iDeccmberi27, 1949, Serial No. 135,204

11 Claims. (01. 222-109) This invention.Jrelatesegenerallm to the liquid dispensing-art,iandzparticularly to a metering. pump .which is adapted forpiusetzin isdispensing n; measured quantitiesaaof glubricatingxoilgfrom a drumior barrelin whichctheizpurnpuis incorpo 5 rated.:. Howeventthe pump;:.forming the, Subject matterof this. application is equal-lyadaptablein dispensing measured quantities .of. Yariousother: liquids from. other containers xand cthe invention is therefore not to be regarded as limitedwto thetr exact. application-to .use. hereinafter;.-referred .to.

Lubricating and other. oilsgareyusually stored in' a; steel drums in automobilepservicinggstationsaandzv: it is the. usuaL practice .to dispense: 517116.;011 11'1130 1 a pouring canbymeans of a conventional: manue: ally operable pump mountedxonr the drum and having a. rotatable1operating1handleniAs is welln" known, such a dispensing.operationiis somewhat-.11.; laborious and. rtimeeconsumingmso thatcithei rat at which the vehiclescan. be service-dais min mized and the cost: of operating :a; busmservic station. is accordingly zincreased.:.; r.Another:dis advantage of such "conventionalehandeoperate oil-dispensing pumps resides in the; fact that: the operator must watch carefully, the.-.1eve1:rof thenZ oil dispensed intoithepouringr-canxso as .1130 avoidaril underfilling or overfilling thereof;

It is therefore an objectrof theLpresentzinveneu. tionto obviatethe disadvantagesof previouso metering and dispensing 'means. .zbyapro idingra .30 pump which .is adaptedsfonnse: in .:connection.1=.: with a drum andwhichfifunctionszoto ':.disp.ense;= :1 accurately a predetermined :quantity :of. :oil from :3: the drum: in a minimumperiod; of :time:

Another object is to providesa pumpaaof the 1 character referred .to .whichis fluidaoperated, preferably "by pneumatic pressure; so that ,it may be connected to theusualsupplyaof compressed. air: in an automobileservice-station or garage to be operated thereby. 40

Anotherobject is to provide a meteringpump I which includes a vertical piston disposedmvithin the drum and a a; pistonrslidable in. the cylinder; said piston being'operative uponrupward move-u ment to draw oilinto the cylinder through -.a check-valve in the-lower end thereof and to force the oil upwardly fromrthe;.cylind'er throughsa delivery tubewhenthepistonis forcedzdowm. wardly.

Another object is to provide a metering. pump-.- in which the piston is forceddownwardly .through anzoperative stroke in responseto the introduc-h tion of compressed air intothe upper end of then. cylinder,-and in which the piston is moved to its-upper position ,to perform-a suction stroke so 15? as to draw a fresh-charge of oil into thezcylinder, through the. medium of spring means.

Another object is to provide a device of the type indicated in which-the cylinder is suspended from an. air tube'which, in turn, is carried by a valve body disposed in anapertureof and sup.- ported by the top wallof the drum an air valve of the poppet type being slidable Within the body to control the injection-of air .into the: cylinders'by way of the airtube. A related. object is to provide a manually operated .-valve-actuator which i is slidable axially of the valve-bodyand-pperative, when raised, to open the air :valve to admit compressed air into the upper endof thecylinder,-; and adapted when released; "by the-operator 'to disengage the air valve soas to permit the latter to close. a valve mbody: having an {aii'.:.V8I1t "passage come dispensing. stroke 10f the piston, "but adaptedvto be closed by a poppet valve head carried byathe it manually operable valve actuator wherr the lat-.

:ter is raised, so as to retain theoperatingeir within (the cylinderandwair tube;

Another object is to provide a device of the.

class .specifiedwhich includes-a lost :motion link connection between the valveactuator and...

the piston. by which the :valve head. of the .actuator is unseated as the pistonwreaches the end of its" discharge stroke: so as to ventcthe-upper end of the cylinder to the atmosphere and thus allow the piston to return to its upper position.

. A further object-is to provide adjustable stop.

means :for limiting the upward sliding movement of the piston so as :to control'with .precisiontthe volumeof oil drawn-into the cylinderand; con a:

sequently, that dispensed during the discharge stroke of the pistonmBy this provisiornthe effec-.

tive volumeof the cylinder can be variedaccw. rately. by merely rotating. the air tube with respectto the cylinder and. this is accomplished.

from outside the drum-with'out disconnecting:

the pump deviceiwi ing. H

Another important. object is to I-providemeansu for sealing-the: piston: againstxpassage of oil I therearoundto the upper portionof the cylinders Since it is impossibleto compl'etelyseal' a piston A further related object is to provide to positively eliminate such leakage, the present invention provides means for trapping oil escaping upwardly around the piston so as to avoid passage thereof into the upper end of the cylinder, and this is a related object of the invention.

Another object is to provide sealing means for guarding .against leakage of air from the upper end of the cylinder to the lower end thereof, Which would reduce the amount of oil dispensed by the pump.

A further object is to provide means to prevent manipulation of the actuator when a container is not in place beneath the delivery nozzle to receive the oil dispensed from the drum.

A further object is to provide an oil drum and pump combination in which the entire pump assembly is merely suspended from the top head of the drum and retained in place by means disposed within the drum.

Further objects will appear from the following specification, and from the drawings which are intended for the purpose of illustration only, and in which:

Fig. 1 is a vertical sectional view through the present improved oil drum and dispensing pump;

Fig. 2 is a plan view of the same;

Fig. 3 is a sectional plan view, taken on line 33 of Fig. 1;

Fig. 4 is an enlarged vertical sectional view of the pump device, taken on line 4-4 of Fig. 2, with the metering piston shown at the upper end of its suction stroke;

Fig. 5 is a further enlarged view, similar to Fig. 4 but showing the piston near the lower end of its discharge stroke;

Fig. 6 is a cross-sectional view, taken on line 65 of Fig. 5;

Fig. '7 is a cross-sectional view, taken on line 'I-? of Fig. 5;

Fig. 8 is a cross-sectional view, taken on line 88 of Fig. 5;

Fig. 9 is a cross-sectional view, taken on line 99 of Fig. 5;

Fig. 10 is a cross-sectional view, taken on line Iii-J0 of Fig. 4;

Fig. 11 is a cross-sectional view, taken on line H-li of Fig. 5;

Fig. 12 is a cross-sectional view, taken on line i2--I2 of Fig. 2;

Fig. 13 is a cross-sectional view, taken on line l3l3 of Fig. 1; and

Fig. 14 is a cross-sectional View, taken on line l4i4 of Fig. 1.

Referring to the drawings in detail, the present improved liquid metering and dispensing means includes a sheet metal tank or drum 2!] which, as shown in Fig. 2 may be one of rectangular configuration, the drum having a bottom head 2! and a top head 22. The present drum also has a horizontal partition 23 disposed intermediate its upper and lower ends but in other respects the drum is similar to conventional oil drums used in automobile service stations and garages for dispensing oil into containers.

As shown in Figs. 2 and 12, the top wall or head 22 of the drum is provided with a flanged filler opening 25 which is normally closed by a filler plate or cover 26. The cover 26 is of inverted dish shape and so proportioned that its depending peripheral flange 21 surrounds the upstanding circular flange 28 of the filler opening 25. The bottom of the cover 26 is a hook 29 which normally underlies the drum head 22 to retain one side of the cover in closed position. At its diametrically opposite portion the cover 26 has an angular extension 30 which overlies the upper corner of the drum and which has a hole 3! in its downwardly extending leg 32. A thumbscrew 33 passes through the hole 3! and is screwed into a boss 34 on the inner surface of the wall of the drum. The head 35 0f the thumb-screw has a transverse opening 36 which aligns with an aperture 31 in the leg 32. A thin sheet metal band 38 is looped through the opening 35 and the aperture 31 and its ends are brought together and joined by a lead seal 40 at the front side of the drum so as to be visible to the consumer. By this construction, after the drum 20 has been filled with lubricating oil, the cover 26 is placed over the opening 25 as shown in Fig. 12 and retained in this closed position by the retaining screw 33, after which the sealing means 38, M1 is applied to lock the screw in place. It is thus seen that the cover 26 cannot be removed without breaking the sealing band 38 and this safeguards against refilling the drum with an inferior grade of oil. A notice calling the consumers attention to the seal may be printed on the front side of the drum adjacent the seal.

Projecting upwardly from the top head 22 of the drum 20 is the upper, detachable extension 44 of an oil dispensing tube 45 which extends downwardly through an opening in the head 22 into the drum. The extension 44 is joined to the upper end of the tube 45 by means of a coupling 46, the lower end of which rests upon an annular flange 4'! of the drum head 22 (Fig. 4). The extension 44 has a laterally bent upper end 58 (Fig. 13) to the outer end of which is detachably connected a dispensing or head nozzle 50. The nozzle is, in effect, an elbow fitting which serves to direct oil, pumped upwardly through the tube 45 and extension 44, downwardly into a suitable container (not shown) which may be placed on the cover 26 beneath the nozzle. Applied to the lower end of the nozzle is a screen 51 through which the oil flows, the screen being curved slightly so that oil which might drain therefrom will drip from the central portion of the screen. It is to be noted that the nozzle opening through which the oil is dispensed is considerably larger than the openings of oil spouts of conventional oil pumping devices so that a much greater rate of delivery of the oil is made possible. A film of oil which normally is present on the screen acts as a seal to prevent air from entering the delivery nozzle and tube. The nozzle 50 is provided with a depending peripheral bead 5| from which rain water may drip so as to prevent the flow thereof onto the screen 5|.

A substantially vertical drain pipe 52 has its lower end projecting downwardly through a flanged opening in the drum head 22 (Fig. 4) a sleeve 53 on the pipe resting upon the annular flange 53' surrounding the opening. By this means, the drain pipe 52 is pivotally mounted, the upper portion of the pipe being rotatable in a U-shaped bracket 54 carried by the tube extension 44. The upper end of the drain pipe 5?; is bent laterally in a sloping arm 55, the upper, outer portion of the arm being cut away to provide a channel 56 which is disposed beneath the screen 51 (Fig. 13) to adapt it to receive oil which drips from the nozzle following a dispensing operation, the oil thus caught flowing back into the drum 2!) through the pipe 52. Since dripping of the oil occurs only at the center of the screen 5!, the channel 56 of the drain pipe 52 can be located entirely inwardly of the rain water dri bead 5 i It is to be noted that the drain pipe 52 is relative- 1y small so that pouringof inferior oill intolthem.

sealed drum through this pipe is prevented. .Th'j

arm 55 carries at its free end an abutment plate 5'! "which is adapted to beiengaged .by thecons H tainer when the latter is placed beneath thenozzle so as to swing theudrain-means to inoperative position againstthe action of a spring tt-(Fig;

14), disposed beneath thedrum head '22. The 1 spring 58 has one endanchoredto the drum head ZZ at 59 and its otherend connected to the lower end of the drain pipe 5 2 at +601 Thus;-the i spring 58 normally tends to retain the drains means in operative position to return dripping-oil to the interior of the-drumwWhen-a con'l'lainen is placed in oil receiving position, the sprin yields to allow -the'drain means to pivot to moperative position and When the container -removed, thedra-in meanssnaps back-into operative A position.-- When it is desired to retain'thedrain means in inoperative position, the arm-55 is swung laterally toa locationwherein-thespring.

58 moves across center as'indicated by the "dotand-dash lines in jFiggll. A finger 5i projects radially from the drain pipe 52 and-is usedfor the purpose to behereinaftenexplained;

Adapted to rest upon an annular flange fissurrounding. an opening in the'drum'head 22 ;is the upper head portion 6 3 of an, element 55 which-is hereinafter referred to as a valvebodyuThe" lower end of the valve body extends downwardly;

into theinterior of the drum 2B and has an axial:

bore or chamber 65. The head 64 has a bore Bl extending parallel to the axis. of the valve body spring H disposed between. thevalve element 10 and a pluglz screwed intotheiupper end of the counterbore actsto normally. maintain. the valveelement in closed position, As shown in Fig. "7,

the upper portion of thavalveelement 1t ispolygonal in cross section,.thus providing segmental.

'45 passages betweenits perimeter and thelcounter-W bore 68 through whichiairi may-pass. The valve,

element is is provided with a depending stemllt which extends downwardly. through theiborefilu Referringto Fig. '7, the headwfi l of the valve '50 body 65 is provided with a diagonaLair-inlet pas-.1-

sage which is in fluid. communication'with the. counterbore 68. The outer end of the-passage 1.5 has a threaded counterboreinto. which is screwed an end. of a pipe nipplefldtheothen end-0f the .1;

nipple being suitably. connected to a hose (notshown) which may extend-iromlatank-tor otheravalve H is employed forthe purposeof regulate1 ing the rate of flow ofcompressedsairathroughz.

the inlet passage 75.

Adapted to slidevertically, in anyaxia'lpcbore i9 of the valve body 65 is a tubularvalve,actuator stem 88, to the lower end of .which-i=is secured;

within the chambeixfit, anainventavalve poppet 8L valve body. 55 and. carries. anactuating knob ,82.

The stem projectsabovethetop of the 1 As shown in Fig. 6, the stem 8%) and therknob 8.2 are split and a binder screw isspassingthrough one side of the split p rtion of theaknobmandr threaded into theother sidethereofbinds the knob firmlyin place on the stem. ;.In addition,..

the stem=80 is clamped aroundra' small pull-rod? which projects downwardly fromethe valve; body 65 =andwhich-is formedtwith'a loop 86 at its lower ends The valvepoppet Bljstemufill and knob 82 together provide a-valveactuator, it being noted that .the peripheral portion of the valve poppet underlies thestem lfi f theair inlet valve NJ. When the knob 82 is raised manually; the

valve poppet-8l Zengages the stem 13 and raises the valve 70 from the seated so as to admit air under pressure intothechamber 66,'as shown in Fig. 5. At the same-timepthe air vent valve poppet 85 engages an annular-seat 90 and thus prevents the escape -of compressed air from the chamber-65 into a compartment! of the valve body-lidthrough radial vent passages 92 (Figs. 5 and 8) l to the atmosphere; When air is introduced into the devicethroughthe valve bore 51, the air vent valve M is held closed due to the pressure air which acts against the entire lower area of the valve 8 I Screwed into the lower end of the valve body it 'is an annular element 85 which is provided with'an integral, relatively long, air tube or sleeve 56. The lower threaded-end of the tube'QB 'is screwed into the upper end member 93 of a pneumatic cylinder Hill which also includes a lower end memberllli; A series of bolts [d2 connected between the end members 98 and It! maintains the parts of the cylinder in connected relation. It is thus seen that the cylinder its is suspended from the air tube SS and valve body 65 within the oil drum 20 (Fig. l).

The lower end platellll of the, cylinder Hill is provided with an oil inlet passage it? formed with a tapered valve seat H36 at its uppervend (Figs. 5 and 11). Disposed centrally within the opening Idfiis a boss 10'! supported from the.

end plate by webs 18;. Slidable in an axial bore. of theboss ill! is the stem I09 of a poppet type check-valve i H) which has a resilient peripheral ring i l 1 adapted to be engaged against thevalve seat 196 by a spring H2. The endplate Elli is further. provided with radially extending walls defining lateral and vertical oil outletpassages 1 l5 and H5. Surrounding the passage HE; is a valve seat iii against which a resili nt ring H8 l of a poppet-type checkevalve lid. is normally held by means of a spring 12!. The lower end of the oil-dispensing tube 45 is screwed into the passage H6 so that oil forced through the passage flows upwardly through the tube and is dispensed through the nozzle 58.

Slidably disposed within the cylinder Him is a relatively wide, hollow piston iZfi. A sleeve lid is screwed into an axial threaded hole in the upper wall of the piston andits lower end is disposed a short distance above the lower. wall of the piston 525 within ,the reservoir l2? thereof. A ball-type check-valve i28 is provided within thesleeve i263. Connected to the upper end of the sleeve I26 is the lower end of a wire link.,i29 through. the upper looped end I35 of which the loop portion 86 of the link 85 is hooked to providenforr lost motion therebetween. It is thus seen that-thepiston I25 is floatingly dis-v posedwithin the cylinder [60. A coil spring 533 surrounds the links-85 and ,IMJ and has its lower end connected .to thesleeve lid and its upper end hooked through. a hole in the element 95. The spring 133 functions normally to raise the pistoncl25 to theposition. illustrated in Fig. 4, butiyields to .allowthe piston to be forced to its lowermost position shown in Fig. 5 under the action. of compressed .air,..introduced intothe 7 upper end of the cylinder I in the manner to be later explained.

As will be apparent from the foregoing, when the piston I25 is slid upwardly, oil is drawn into the cylinder I00 through the passage I05, after which the check-valve IIO closes. Upon downward movement of the piston I25, the metered oil is forced from the cylinder I00 past the checkvalve I20 and discharged through the delivery tube and nozzle 50. It is to be noted that when the piston I25 is drawn upwardly by the spring I33, its upper end engages the lower end of the air tube or sleeve 95 which extends into the cylinder I00. Upon completion of the upward stroke of the piston I25, a predetermined volume of oil, for example a quart, will have been drawn from the drum 20 into the cylinder I00, and this amount of oil will be dispensed from the nozzle 50 when the piston is operated through its downward discharge stroke.

To effect dispensing of the exact quantity of oil, it is necessary that the displacement of the piston be such that the proper effective volume of the cylinder I00 be utilized and to ob-- tain this exact displacement, the tube 00, together with the valve body 65, is screwed farther into or from the cylinder head 90 so as to adjust the lower extremity of the tube toward and away from the lower head IOI In order to effect such an adjustment, it is necessary that the cylinder I00 and associated parts be held against rotation and thisis accomplished by means of the partition 23 of the drum 20. As shown in Figs. 1 and 3, the partition 23 has a circular opening I36 through which the lower end of the metering and dispensing device, that is, the cylinder assembly 08, I00, WI and the lower end of the dispensing tube 05 are lowered to dispose them adjacent the bottom of the drum. The opening I30 has a pair of slot-like extensions I3I' and I38 into which the respective tubes 05 and 06 can be located by moving the cylinder assembly laterally following its insertion through the opening I36. To retain the cylinder assembly in this latter location, a retainer strip I39 is bolted to the partition 23 and extends across the slots I31 and I 30 to prevent displacement of the tubes 45 and 06 therefrom. It is thus seen that the cylinder assembly is held against rotation so that manual rotation of the tube 05 by means of the valve body 05 causes the tube to be adjusted axially within the cylinder I00. The entire device may be raised slightly by merely lifting the valve body 05 so as to facilitate turning of the latter.

Referring to Figs. 4 and 5, the hollow piston I25 is provided with sealing means to avoid leakage of oil from the lower end to the upper end of the cylinder I00. The sealing means includes resilient sealing rings I40, It! and 502 of the so-called cup type which are disposed in peripheral grooves of the piston. Each sealing ring is substantially U-shape in cross section, the sides or legs of the U-section being adapted to spread apart in response to pressure exerted within the section, so as to engage the inner surfaces of the cylinder I00 and the peripheral groove in which the particular ring is disposed. The sealing rings I40 and I l! serve to seal the piston against leakage of compressed air from the upper end of the cylinder into the lower end thereof so as to avoid air bubbles in the oil dispensed by the device and thus prevent volumetric discrepancies, these rings being arranged with the legs of their U-sections directed upwardly. The sealing ring I42, on the other 8 hand, has the legs of its U-section directed downwardly so that this ring guards against upward flow of oil past the piston. As will be apparent, the cup-shaped sealing rings I40, MI, and I42 permit the piston I25 to rotate within the cylinder I00 relative to the adjustable air tube 06 so that if the knob 82 should be rotated, the piston is likewise rotated without disturbing the adjustment of the air tube.

The piston I25 is also provided with a peripheral groove I45 disposed between the sealing rings I40 and MI, this groove communicating with the interior of reservoir I2I of the piston through apertures I06. By this provision, during each discharge stroke of the piston, any oil which may escape upwardly past the lower rings I42 and MI can flow into the reservoir IZI. When the level of the oil flowing into the piston covers the lower end of the sleeve I20, operating air, which may leak past the ring I40 and enter the piston by way of the apertures I46, forces the oil upwardly through the sleeve and past the ball check-valve I20. Since the oil is somewhat atomized by the pressure air, the globules of oil are carried upwardly through the air vent openings BI and 92 during the return stroke of the piston to uppermost position.

The liquid metering and dispensing device having been described in detail, the method of operation thereof is explained as follows: Assuming that the present improved device is to be employed for metering and dispensing lubricating oil from the barrel or drum 20 and that the device is installed in the drum and presently inoperative, the parts of the device assume the positions shown in Figs. 1 to 4. That is to say, the drain means 52 is maintained in a position wherein its channel end 56 underlies the nozzle 50 so as to drain back into the drum 20 any oil which may drip from the nozzle. The piston I25 assumes a position wherein it abuts the lower end or the air tube 96, the piston being retained in this position under the action of the spring I33. It will be observed by reference to Fig. 4. that the pull-rod 85, the valve 8|, the stem 00, and the knob 82 assume their lowermost position under the action of gravity. Thus, the air valve I0 is closed by its spring II and the air vent valve BI is open. It is to be noted that when the drain means is in its operative position, its finger BI overlies the knob 82 and thus prevents raising of the latter to a position which would operate the device to effect dispensing of a metered amount of oil directly into the drain tube 52. By this provision, dispensing of oil, when a container is not positioned to receive the same, is normally prevented. Since the piston I25 is in uppermost position, there exists a metered charge of oil in the cylinder I00, the check-valves II 0 and I20 being closed.

To dispense the measured amount, for example a quart, of oil a container is first placed on the drum head 22 and moved under the spout or nozzle 50. During this movement, the container engages the abutment plate 51 of the drain pipe 52 and thus pivots the latter to inoperative position against the action of the spring 50. In this manner, the finger 6| is swung clear of the knob 82. With the container thus in place, the attendant merely grasps and raises the knob 82 to cause the air vent valve M to engage the seat 00 so as to close the air vent passages 0I, 92. At the same time, the valve 0i engages the stem 73 of the valve III to raise the latter from the seat 69 so that operating air can flow from the pipe .16 ,w through-the passa e wand-past the valve .10, into the: valve body 64;.rand thencedownmwardly through-the air tube 96 to impinge against the. piston 12 5 so as. to l force thealatter down- :wardly. ,-In this,mannerthe ,oilcontained in the cylinder 1 I is iorcediromlthe cylinder; through the passage I I5, valve. I 20, tube 45, .extension. Mi,

- and nozzle 50 into the-container. The downward smovement ofthe-piston E25 is relativelylrapid. so 1 that the oil is dispensed. into rtheqcontainer at a fast rate.

Since-the lower end of I the cylinder 1 I00 is disposed within the supply of ,oil. in the drum:20, the presence of air in the dispensed oil is: avoided. and asteady, .even stream of oil. is I caused toflow intothecontainer so that splash- .vsing ofthe oil iscminimizedw It is to; be noted I .that the interiorof the .air,,tubef96.- andmthe interior of the valve body 65 arerelatively small so that the dead air space of the device is .w minimizedand thismakesqfor greater efiiciencyl .As the piston completes. its downwardoperat- .ing strokeunder the .force ofwoperatiing air introduced into theupper. end of thecylinder, to the position shown in Fig. 5, the lostemotion linkage 85, I29 acts to draw the valve. 8I downwardly lieved, the spring I33 acts to return the floating piston from the position shown in Fig. .5 to that illustrated in Fig. 4. During this suction stroke of the piston "I25, oil is .drawn into the cylinder I00. throughthe large passage I05, the checkvalve lleopening to admit, the, oil.- Eventually, the piston J25 reaches its uppermost position .where it engagesthe lower end of the .air tube 96 at which time. the predetermined amount of oil Willhave been. drawn into .the cylinder and the check-valve IIOWillclose; If it becomes nec- 4 to fsaidffiuidValvemeans and said Vent Valve means ,for simultaneously; opening said fluid valve essary to adjust the device to..more accurately dispense the necessary amount of oil, the operator merely turns. thevalve body 65 so as to locate the lower end of theair tube at a greater or lesser depth within the cylinder E00. 'Inaddition, the operator mayadjust the ,pull-i'od'85 axially by simply loosening. thebinder screw 83 and sliding the rod,after whichthe screw is retightened. By so adjusting the pull-rod 85,1 the cyiinder 100 is dispensedtherefrom through the 5 delivery tube 45 and nozzlei5il, and that following each dispensing stroke and after the knob been released, the piston I25 is drawn upwardly by the spring I33 to meter a predetermined amount of theoil for subsequent delivery to a container. It will be apparent that the operator may cause the device to dispense smaller quantities of oil by reciprocating the' knob 82 at a fast rate.

In the foregoing specification the liquidmetering and dispensing device ha beendescribed in connection with. anoil drum' for delivering oiltherefrorn'. It will be apparent, howevenithat the present device isad'aptable for use inxmeasuring; and dispensing"other-liquids; such as beverages, fruit juicesymilk; etc., and, the invention is therefore not tobe regarded as-limited I clairnas -myinventionz theicombination of: a receptacle for a liquid; a cylinderp-inlet passage means-communicating at 110 9 end withione, end of. said cylinder and comc-smunicating at; its I-other endwith the interior w of said receptacle; normally" closed inlet check valve means in-said=inlet passage means and sopena'ble by flow-through said inlet passage v-r-rneans-frorn saidreceptacle to said cylinder; dis- 10 charge passage-means:communicating at one end --l--with saidone-end of said cylinder'and communiueating at its other end with the exterior of said receptacle; normally closeddischarge check valve i-tmeans in said" zdischarge --passage means and -openab1eby=fl0w through said'discharge passage :meansfr om said cylinder to the exterior of said receptacle; a piston reciprocable in said cylinder;

resilient ineans operatively connected to said l piston:and-biasingsaidzpiston in a direction from 0 said-one end oft said cylinder toward the other ends-thereof, said piston drawing liquid from said receptacle into said cylinder through said inlet passage'means upon-movement of said piston in aid direction by said resilient means; fluid pas- 1-.;sage'means. connectibleto ,a source 'of operating fluidunderpressure at one end and communicat- ,-.;ing ;at,its-other end with. said other end of said @cylinder .onlya whereby; an operating fluid under pressure mayybe. introduced into said other end of saidcylinder to movesaid piston in the 0p- .wpositendirectionl in said cylinder so as to force liquid-from said cylinder through said discharge passage means; normally closed fluid valve means in saidrfiuidtpassage means; vent passage means i communicating at one end with the exterior of sh-said receptaclegand communicating at its other end with said 'other end of said cylinder; nor- :mally open vent valve means in said vent passage means; control means operatively connected means and closing (said vent valve means, and for cg simultaneouslyo closing saidfluid valve means aud t-opening. .saidvent valve means; and means ittoperatively connecting said control means and .-sai d .apiston. for ,automatically closing said fluid .Hvalveumeansand. opening said vent valve means whensaid piston reaches the ends of its discharge stroke in, said. opposite direction whereby said resilient means returns said piston to said other end of said cylinder in said direction, said fluid .yalvemeans remainingclosed and said vent valve means remaining ,open until; such time as said ...,contro1 \m eans. isamanually actuated at some iqsubsequent time,;,whereupon said piston remains at said Otherend of said lcylinderuntil such subsequent time.

a: liquidmetering anddispensing device,

gthelcombination of: a receptacle for a liquid; .a cylinder;- inlets-passage means I communicating l, at one end with one. end of said cylinder and comismunicating, at,-its. other-.endgwith the interior of ".ssaidreceptade; normally closed inlet check valve ,-means in ,said inlet passagemeans and openable I by,-flow; through said inlet passage means from said-receptacle to said cylinder; discharge passagermeans communicating. atone end with said .Lone ;end ofsaid cylinder and. .communicating at its -iotherl-end with the exterior of said receptacle; nO1;-mally".c1o sed' discharge check. valve means in isaidrdischargerpassage :means andopenable by w flow; through-ssaid discharge passage. means from tcsaidicylinder.tonthe exterior of said receptacle; piston-,4 reciprocable. in; saidwcylinder; resilient swam means operatively connected to said'piston and biasing said piston in a direction from said one end of said cylinder toward the other end thereof, said piston drawing liquid from said receptacle into said cylinder through said inlet passage means upon movement of said piston in said direction by said resilient means; fluid passage means connectible to a source of operating fluid under pressure at one end and communicating at its other end with said other end of said cylinder, whereby an operating fluid under pressure may be introduced into said other end of said cylinder to move said piston in the opposite direction in said cylinder so as to force liquid from said cylinder through said discharge passage means; normally closed fluid valve means in said fluid passage means; vent passage means communicating at one end with the exterior of said receptacle and communicating at its other end with said other end of said cylinder; normally open vent valve means in said vent passage means; control means operatively connected to said fluid valve means and said vent valve means for simultaneously opening said fluid valve means and closing said vent valve means, and for simultaneously closing said fluid valve means and opening said vent valve means; spring means operatively connected to said fluid valve means and said vent valve means for biasing said fluid valve means closed and said vent valve means open; and hydraulic means exposed to and actuable by operating fluid under pressure in said fluid passage means intermediate said fluid valve means and said cylinder for maintaining said fluid valve means open and said vent valve means closed in opposition to the action of said spring means, said hydraulic means being operatively connected to said fluid valve means and said vent valve means.

3. A device as defined in claim 2 wherein said fluid valve means includes an annular seat in said fluid passage means and a valve member engageable with said annular seat, and wherein said vent valve means includes another annular seat in said vent passage means and another valve member engageable with said other annular seat, said hydraulic means including a surface of one of said valve members exposed to operating fluid under pressure in said fluid passage means intermediate said fluid valve means and said cylinder.

4. In a valve device for a liquid metering and dispensing apparatus which includes a cylinder having a piston reciprocable therein and which includes fluid passage means and vent passage means communicating with one end of said cylinder to deliver operating fluid under pressure to said one end of said cylinder and exhaust spent operating fluid therefrom, respectively, the combination of: normally closed fluid valve means in said fluid passage means, said fluid valve means including a first annular seat in said fluid passage and a first valve member engageable with said first annular seat; spring means engaging said first valve member for biasing it into engagement with said first annular seat; normally open vent valve means in said vent passage means, said vent valve means includin a second annular seat in said vent passage means and a second valve member engageable with said second annular seat, said first and second valve members being movable toward their respective open and closed positions in opposite directions and said second valve member engaging said first valve member to move said first valve member to its open position in opposition to the action of said spring means upon movement of said second valve member from its open positionto its closed position; and control means connected to said second valve member for moving it from its open position to its closed position.

5. A device as defined in claim 2 including a valve body containing said fluid valve means and said vent valve means, said fluid passage means and said vent passage means including a tube common thereto and connected at one end to said valve body and extending into said other end of said cylinder, said tube being threadedly connected to said cylinder so that said other end thereof provides an adjustable stop for said piston to limit movement of said piston during the intake stroke thereof in said opposite direction.

6. In a liquid metering and dispensing device, the combination of: a receptacle for a liquid; a cylinder; inlet passage means communicating at one end with one end of said cylinder and communicating at its other end with the interior of said receptacle; normally closed inlet check valve means in said inlet passage means and openable by flow through said inlet passage means from said receptacle to said cylinder; discharge passage means communicating at one end with said one end of said cylinder and communicating at its other end with the exterior of said receptacle; normally closed discharge check valve means in said discharge passage means and openable by flow through said discharge passage means from said cylinder to the exterior of said receptacle; a piston reciprocable in said cylinder; resilient means operatively connected to said piston and biasing said piston in a direction from said one end of said cylinder toward the other end thereof, said piston drawing liquid from said receptacle into said cylinder through said inlet passage means upon movement of said piston in said direction by said resilient means; fluid passage means connectible to a source of operating fluid under pressure at one end and communicating at its other end with said other end of said cylinder, whereby an operating fluid under pressure may be introduced into said other end of said cylinder to move said piston in the opposite direction in said cylinder so as to force liquid from said cylinder through said discharge passage means; normally closed fluid valve means in said fluid passage means; vent passage means communicating at one end with the exterior of said receptacle and communicating at its other end with said other end of said cylinder; normally open vent valve means in said vent passage means; control means operatively connected to said fluid valve means and said vent valve means for simultaneously opening said fluid valve means and closing said vent valve means, and for simultaneously closing said fluid valve means and opening said vent valve means; a nozzle connected to said other end of said discharge passage means; and a drain tube mounted on said receptacle and communicating at one end with the interior of said receptacle, said drain tube being movable from an operative position wherein the other end thereof is disposed below said nozzle to receive liquid dripping therefrom to an inoperative position wherein said other end thereof is spaced from said nozzle, said drain tube including an abutment element adapted to be engaged by a container placed beneath said nozzle so as to move said drain tube to said inoperative position.

7. In a liquid metering and dispensing device, the combination of: a receptacle for a liquid; a cylinder; inlet passage means communicating at one end with one end of said cylinder and communicating at its other end with the interior of said receptacle; normally closed inlet check valve means in said inlet passage means and openable by now through said inlet passage means from said receptacle to said cylinder; discharge passage means communicating at one end with said one end of said cylinder and communicating at its other end with the exterior of said receptacle; normally closed discharge check valve means in said discharge passage means and openable by flow through said discharge passage means from said cylinder to the exterior of said receptacle; a piston reciprocable in said cylinder; resilient means operatively connected to said piston and biasing said piston in a direction from said one end of said cylinder toward the other end thereof, said piston drawing liquid from said receptacle into said cylinder through said inlet passage means upon movement of said piston in said direction by said resilient means; fluid passage means connectible to a source of operating fluid under pressure at one end and communicating at its other end with said other end of said cylinder, whereby an operating fluid under pressure may be introduced into said other end of said cylinder to move said piston in the opposite direction in said cylinder so as to force liquid from said cylinder through said discharge passage means; normally closed fluid valve means in said fluid passage means; vent passage means communicating at one end with the exterior of said receptacle and communicating at its other end with said other end of said cylinder; normally open vent valve means in said vent passage means; control means operatively connected to said fluid valve means and said vent valve means for simultaneously opening said fluid valve means and closing said vent valve means, and for simultaneously closing said fluid valve means and opening said vent valve means; a nozzle connected to said other end of said discharge passage means; and a drain tube mounted on said receptacle and communicating at one end with the interior of said receptacle, said drain tube being movable from an operative position wherein the other end thereof is disposed below said nozzle to receive liquid dripping therefrom to an inoperative position wherein said other end thereof is spaced from said nozzle, said drain tube having an element which overlies said control means when said drain tube is in said operative position so as to prevent actuation of said control means.

8. In a liquid metering and dispensing device, the combination of: a receptacle for a liquid; a vertical cylinder; inlet passage means communicating at one end with one end of said cylinder and communicating at its other end with the interior of said receptacle; normally closed inlet check valve means in said inlet passage means and openable by flow through said inlet passage means from said receptacle to said cylinder; discharge passage means communicating at one end with said one end of said cylinder and communieating at its other end with the exterior of said receptacle; normally closed discharge check valve means in said discharge passage means and openable by flow through said discharge passage means from said cylinder to the exterior of said receptacle; a piston reciprccable in said cylinder, said piston being hollow and having radial passages in its peripheral wall and an axial passage in its top wall with a check valve in said. axial passage exposed to fluid pressure in the upper end of said cylinder, said check valve preventing ingress of pressure fluid into said piston during the discharge stroke of said piston but permitting egress during the suction strok of said piston of pressure fluid and liquid entering said piston through said radial passages; resilient means operatively connected to said piston and biasing said piston in a direction from said one end of said cylinder toward the other end thereof, said piston drawing liquid from said receptacle into said cylinder through said inlet passage means upon movement of said piston in said direction by said resilient means; fluid passage means connectible to a source of operating fluid under pressure at one end and communicating at its other end with said other end or said cylinder, whereby an operating fluid under pressure may be introduced into said other end of said cylinder to move said piston in the opposite direction in said cylinder so as to force liquid from said cylinder through said discharge passage means; normally closed fluid valve means in said fluid passage means; vent passage means communicating at one end with the exterior of said receptacle and communicating at its other end with said other end of said cylinder; normally open vent valve means in said vent passage means; and control means operatively connected to said fluid valve means and said vent valve means for simultaneously opening said fluid valve means and closing said vent valve means, and for simultaneously closing said fluid valve means and opening said vent valve means.

9. A device as defined in claim 8 in which said piston is provided with peripheral sealing rings, at least one sealing ring being disposed between said radial passages and said top wall and at least two sealing rings being disposed between said radial passages and the bottom wall of said piston.

10. A device as defined in claim 9 in which each of said sealing rings is resilient and of U-shaped cross section,

11. A device as defined in claim 10 which includes a sleeve carried by said top wall and extending downwardly into said piston with its lower end disposed adjacent the bottom Wall of said piston, said check-valve being within said sleeve, said resilient means consisting of a tension spring having its lower end connected to said sleeve and havin its upper end connected to said fluid passage means.

References Cited in the file of this patent WITED STATES PATENTS Number Name Date 507,316 Fowler Oct. 24, 1893 1,510,981 Davis Oct. 7, 1924 1,767,354 Eastes June 24, 1930 2,235,544 Wold Mar. 18, 1941