US1816900A - Liquid dispensing apparatus - Google Patents

Description

Aug 4 1931- A. L. GRISE 1,816,900

LIQUID DISPENS ING APPARATUS IN V EN TOR.

- f 4 ATTORNEYS.

Aug. 4, 1931. A. L. GRISE LIQUID DISPENSING APYPARATUS Filed June 18, 1929 7l Sheets-Sheet 2 IN V EN TOR.

ATTORNEYS.

Afa

Aug. 4, 1.931.

A. L. GRISE LIQUID DISFENSING APPARATUS Filed June 18. 1929 7 Sheets-Sheetl 3 ATTORNEYS.

I ug. 4, l5.931. A. L. GRISE l 1,816,900

LIQUID DISPENSING AAFFARATUS ATTORNEYS.

Aug. 4, A. L. GRISE A LIQUID DISPNSING APPARATUS Filed June 1s, 192s 7 sheets-sheet 5 @ZZ- y IN V EN TOR.

ATTORNEYS.

Aug 4,v 1931 v K A. L. GRISE l 1,816,900

LIQUID DI SPENSING APPARATUS Filed June 18. 1929 7 Sheets-Sheet 6 1N V EN TOR.

By @nf/wai *Waf/ ATTORNEYS.

Aug. 4, 1931. A. L. GRISE LIQUID DISPENSING APPARATUS Filed June 18, 1929 v sheets-sheet 7 IN1 F\ TOR 274W b M ATTORNEYS.

Patented Aug. 4, 1931l UNITED s1iv11a-sv PATENT oFFicE ALFRED L. GRIS, 0F SIRINGIIEVI'EID,y MASSACHUSETTS, ASSIGNOR TO GILBERT & BARKER MANUFACTURING COMPANY, OF WEST SPRINGFIELD, MASSACHUSETTS, A.

CORPORATION OF -MASSACHUSETTS LIQUID DISPENSING APPARATUS Application 'led une V"18,

relates to that special type of apparatus, wherein .each .measuring cylinder is provided with apiston and the pistons are intercon-v nected by means in part of a resilient nature, the arrangement being such that one piston, moving under liquid pressure on its filling stroke, moves the other on its dis- 'just charge stroke and also such that the resilient part of the connection is stressed during the latter part of the filling stroke of 'each piston and later imparts a spring impulse to that piston to start it on its discharge stroke.

Such arrangement contemplates that either.

piston, which is forcing out liquid from its measuringcylinder,will complete its .Work well ahead oi the time When the other piston has completed its stroke in themeasuring cylinder which is being filled. The apparatus this ,way Without trouble. However, under certain conditions, such as abnormally fast pumping or restrictions in the discharge passage or hose, one piston can be made to complete its filling stroke before the other completes lits discharge stroke because the resilient part of thev aforesaid connections may yield before the appointed time.

y This invention has ,for one object .the provision ot' means for preventing the diiculty described. This object is accomplished by providing two locks for the valve mechvani'sm, one of which will be released by either piston at the end of its filling stroke and the other ot which" will be released by either piston at the end of its discharge under normal conditions,` Willfw'ork in l1929. serial No. 371,854.

the base of each cylinder, to eliminate any passageof pocket between the base of the cylinders and the "valve or-valves, in which liquid can collect'without being delivered immediately through the hose.

Other features of the invention will appear from the following description and will be pointed out in the appended claims. A

The invention will be disclosed with reference to the accompanying drawings, in which Figs. 1 and 2 are front andside elevational views of the dispensing apparatus;

Fig. 3 is a fragmentary sectional elevational view of one of the measuring cylinders showing its piston and the float-operated air valve therein.;

Fig. 4 is a Isectional plan view taken on the line 4 4` of Fig. 3;

'Figr is a view taken similarly to Fig. '3 but showing the loat valve in a different posifion;

Fig. 6 is a fragmentary elevational view of one 'of th\=l -measiiring cylinders, taken from the same ldirection as Fig. 2 but showing the hood in section;

Fig. 7 isa sectional elevational view, the upper portion ofwhich istaken along the line 7 -7 of Fig. 2 and the lower portion of which appears as it would if the enclosing casing `Were vremoved -tially along the line 8 8 of Fig. 1;

Figs. 9 and l() are front and rear elevational views, respectively, ot the intermediate section of. the apparatus, showing thel valve ICI) operating and -locking mechanism and associated parts;

Fig. 11 is a sectional View taken at right angles to Figs. 9 andlO and illustrative of the same mechanism;

.Fig 12 is a sectional planviewtaken onv the line 12-12 of Fig. 9;

Fig. 13 is a sectional plan view taken on the line 13-13 of Fig. 14;

Fig. 14 is a 'sectional elevational view taken on the line 14-14 of Fig. 12; and

Fig. 15 is a ragmentary'view, taken simig larly to Fig. 12 but with the valves removed to clearly reveal-the underlying port-s.

The dispensing apparatus includes two measuring cylinders 20 (Fig. 7), usually of glass or other suitable transparent material Vand each containing a suitable piston. 21,.

Each piston (see Fig. 3) has one or .more air passages 22 therethrough, which 'are openedand' closed under the control ofa float 23. Each piston has iiXed thereto a piston rod 24, extending downwardly through the common base casting 25, on which themeasuring cylinders are supported. These rods are connected together in any suitable way, preferably by a flexible member, such as the sprocketchain 26,` so that the pistons are forced to move in opposite directions. interposed, in

ythe connections between rods 24 are elastic means, such as one or more springs 27. A

Liquid under lpressureis supplied to the measuring cylinders alternately, at points beneath their pistons. under the control of suitable valv` means, herein shown as individual ported disc valves 28, which are interconnected to be operated simultaneously and extremely rapidly by a sin-gle spring impulse driving mechanism, such as that shown in Fig. 9,-the drive spring of which is marked 29. The arrangement is such that, when either valve 28 is positioned to admit liquid 'to the base of one measuring cylinder, the

other valve is so positioned as to permit its contents'to discharge through the outlet 30 and into hose 31. Thus, the piston, risingy in one cylinder under the pressure of the pumped liquid, communicates a force through I the chain 26 and springs 27 to the other piston, whereby the latter forcibly discharges the liquid previously admitted therein.

The stroke of each piston is adjusted so ais to displace a denite measured quantity of liquid from its cylinder. Each piston is positively limited in its stroke,#at one end by the abutment of the lower face-of the piston with the upper facev of, casting2, which .A has reached the limit of its stroke connections bet-Ween the pistons compensates for such differences in strokes and enables onel piston to move, .if necessary, to reach the limit of its stroke in one direction, after the other in the other direction.

By preference, I utilize the 'elastic means *i 27 for imparting a spring impulse to each piston to initiate its downward and discharge stroke. In such a case, thel connections between the pistons are soarranged that leach piston will normally vreach the end of its discharge or downward stroke beforev the other has completed its filling or upward stroke, as vill be clear from Fig. 7. In thisv way, continued movement of the rising piS- tonvafter the other pistonlias stopped, will -result in a substantial degree of stressing of springs 27. As each piston reaches the end of its upward stroke, it effects the release of that one of two latches 34, which has tlieretofore been restraining a valveA operating lever 35 from movement 'under the force of the drive spring 29. iVhen this lever is released, andV if the valve lever is otherwise tree to move, the springs 27 previously stressed as described, suddenly relieve their stressl and' impart a. quick, sharp, downwardly-directed impulse to'one of the pistonsv to start it on its downward and discharge stroke. u Y

'W'hen an 'elastic connection.l is interposed inthe connections vbetween the pistons, for i either of the two .purposes described, it 1s essential, in order to guard against improper operation ofthe apparatus, to prevent oper- .Y

ation of the valves until both pistons have completed their strokes. Operation of theV valves cannot occur'until the rising piston is arrested by abutment 32 which occurs simultaneously with the-release of valve .leverl 35 by latch 34. Normally the descending pist'on would have been arrested by abutment with base 25 before this time, but if the pumping is extremely rapid and/or the discharge` is sluggish because of a crooked -or trapped hose or for other reasons,the resist-` ance vto movement of the descending piston may be such as to cause springs 27 to yield before the appointed time. l-Vhile this is not the normal condition,.it is'one that can occur and one that needs' to be guarded' against. -As a safe-guard againstsuch trouble, the valve operating mechanism is pro- 'vided witha. supplementary-locking device 436 (Fig. 10), engageable in either of two notches 37 ina disc 38, secured to' the saine shaft 39, which carries the valve operating lever35. `This locking device 36 is arranged toibe withdrawn from holding engagement' with disc 38 by either' piston but only at the endof the discharge or descending movement thereof. Thus, the valves cannot operate until kthe rising piston completesits upward stroke and releases latch 34 and until Athe descending piston completes its down- 'planned notwithstanding that an elastic,

and therefore yieldable, element is interposed in the connection between the two pistons.

Referring to the details of the valve mechanism, each valve 25E-consists of a. ported circular disc (Fig. 12) which is-set into a recess 40 (Fig. 15) in the' base `25of its cylinder With its upper face (Fig. 14) flush with the upper face of suchbase. Each valve 28 has two diametrically opposed ports 41 (Figs. 12 and 14) extending 'vertically therethrough. In the base of each recess 40 are two diametrically opposed discharge ports 42 (Figs. 14 and 15) land all four of these ports communicate with an underlying discharge Ipassage 43 (Fig. 14) which is formed in base 25, and best shown in Fig. 13. Also formed in the bottom wall of each recess 40-is an inlet port 44 and these two ports communicate with an underlying inlet passage 45 (Fig. 13). Each valve is fixed to the upper end of a stem 4G which extends downwardly through and below casting 25, carrying on its lower end an arm 47 (Fig. 14).-

These two arms 47 are interconnected by a link 48, which has a central recess 49 of inverted U-shape to receive a roll 50 (Fig. 10) carried on the upper end of an arm 51. The latter at its other end, is fixed to the valve operating shaft 39 (Fig. 11) and, in coope'ration with a collar 52 on such shaft,v holds the shaft against undue endwise movement -in its support 53. The latter is ahollow casting, suitably secured as indicated to the lower face of base casting 25 and depending centrally therefrom. It will be clear 'that when the valve operating lever is actuated to turn shaft 39, both yvalves 28 will be simultaneously turned. The limit of this turning movement is ninety degrees and each valve 28 canturn from a position, wherein both ports 41 register with both discharge ports 42, to a position wherein one of the ports 41 registers with the port 44. In this' way, the valve connects its measuring'cylinder to the supply or discharge passages 45 or 43, respectively. From Fig. 12, it will be clear that when one valve 28 connects its cylinder 20 to the supply passage, the other valve is positioned so as to connect its cylinder 2O to the discharge passage. Thus, one

measuring 'cylinder fills while the other discharges.

Means are provided .for holding each valve against lifting from its yseat in recess 40 under the pressure ofthe liquid pumped into passage 45 and such means is preferably adjustable to compensate for wear; As herein shown, this means includes a nut 54 threaded onto the lower end of the valve-stem 46 and held. in adjusted position by .a'check nut 55. Nut 54 acts to draw down the valve stem by pressing againstthe valve arm 47, which is slidably connected by a key 56 to stem' 46.

'The upper part 4of arm 47 preferably bears 'against aball bearing 57, which in turn bears against Athe'lower end of a lsleeve 58;

The upper end of sleeve 58 bea'rs'against the under face of casting-25. )Within sleeve 58 is a spring 59, which acts between the ball bearing 57 and a gland 60. to compress the packing 61 in the stuffing box'formed' in casting 25, and thereby prevent leakage around valve stein 46. Leakage around the piston rods 24 is prevented by similar stuffing boxes shown in Fig.,14.A `The glands-62 ofy these boxes are pressed upwardly by a pair of springs 63 (Fig. 1 0) acting against the heads of a pair of studs 64 secured to casting 25.

The casting 53 is hollow (Fig. 7) affording a passage G5 which communicates as indicated in Figs. 11 and 13 with supply passage 45. To the lower end of casting 53 is bolted a vertically depending-cast-pipe section 6G, to the lower end of which is connected the supply pipe 67 for liquid under pressure.

Near the lower endof the pipe section 66 are a pair of diametricallyeopposed, radially-extending arms -68 in each of which is fixed a depending tube G9.v The tubes 69 slidably receive and guide the piston rods 24. The` arms 68 also serve to support the lower ends of a pair of fixed guide rods 70, disposed one directly 'behind each piston rod 24 (Fig.v

1Q) ,-the upper ends of these rods being rec'eived inv suitable sockets infthe base cast ing 25. l l .v Referring'next to Fig. 9and the connections between thetwo piston rods, each rod of these arms a rod' '72 isv mounted to slide in a direct-ion parallel to the axis y of the piston rod. The springs 27, above described, are applied one .to each of these rods, Each springfacts between the upper face of arm 71 and an adjust-ablel abutment 73 on its rod, tending to lift the latter until ahead 74 on-the lower end of the rod abuts -the lower face of arm 71. A The chain 26, above referred to, is connected at its ends, one to each of the heads 74. Thisch'ain is suitably guided intermediate its ends, as by a pair of grooved rolls 75 mounted one on each of the arms 68, so that the two vertical stretches of 105 24 has fixed thereto an arm 71 andin each 3 4 and that this lever is released, when the rising piston reaches the upper end of its stroke. These latches (Fig. 9) are pivoted ou studs 76 secured to casting 25. The free nd of each latch rests on top of a head 77, formed on the upper end of a rod 78, which is mounted for vertical sliding movement in a bearing 79. These bearings are formed, one on each outer end of-a bar 80, secured by bolts81 to casting53. 'Aspring 82 con-v nects each latch 34to the adjacent bearing 79 and tends to hold lits latchand rod 78 in the illustrated position', in which head 77 abuts the upper end of, bearing 79. Adjustably mounted on the lower end of each rod '78 is -an abutment 83. These abutments 83 are located, one in the path of each of a pair of arms 84, secured one to each piston rod 24 and preferably formed as a vlescribed arm 71. Vhen the le t hand piston is rising, the valve lever 35 is restrained by the left hand latch 34 and this latch will be released after arm 84 has engaged abut# ment 83 and lifted it far enough for the purpose. The actual release occurs simultaneously with the engagement of the abutment 32 on the rising piston with the overlying and fixed abutment 33. When 4the right hand piston is rising, lever 35is' rest-rained by the right hand latch 34 and this latch will be released in a. similar way and at a similar time by movement of the right hand arin 84. The locking device 36, which also controls v the time of movementof shaft 39 and thus the time of operation of valves 28, will be described with particular reference to Figs.- 10 and 11. This device consists of a piece of square cross section formed on the upper end of a rod 85, which slides vertically in a lug 86, formed on and projecting rearwardly from casting 53 near 4the lower end thereof. The rod 85 has a keyway 87 in which is engaged a pin 88 lfixed in lug 86, whereby to hold lock 36 froin`fturning'during-*its sliding movement and, in proper position for entry into the notches 37 of the locking disc 38. Rod 85, atitslower end, is threaded into a sleeve 89 fixed to the upper, end of a rod 90. Rod 85 can therefore be raised or lowered with respect to rod 90 for purposes of adjustment` although in all other respects it is virtually a part thereof. Rod 90 is vertically slidable in upper and lower guides 91 formed on the back side of pipe 66. Fixed at a point intermediate its ends to rod 90 and located also between the upper and lower guide 91 is a. cross bar 92. A- 'spring 93, acting be.- tweeu the top ofthe upper guide 91 and a eoilar 91 [ined ou red 90. tends to lift the late'r and holddork engaged iu one of the recesses 37. The rising moveu'xent` of, the rod is limited by' the abutment of cross bar 92 with the bottom of the'upper guide 91. The

- outer ends of cross bar 9,2 are slidably engaged .7 one with each guide rod 70. An arm 9.6 is

art of the fixed to and projects rearwardly from each i 36 in the manner and at the time described.

The valve lever 35, which as above described is positively held Iagainst movement until one piston reaches the upper end of its stroke and the other reaches the lower end of its stroke, is moved extremely rapidly when released by the drive spring 29.v The latter is coiled around a rod 96 (Figs. 9 and 11) -and acts between-a forked head 97 on one end of that rod and a collar-98, which is swivelled in and projects forwardly from the valve lever Rod 96 is free to slide in piece 98. Fork 97 is pivoted to the upper end of a lever 99 and the latter is pivoted intermediate its ends on a stud 100, fixed to a bracket 101. bolted to 'the front face of casting 53. During the driving of lever 35 by spring 29, lever 99 is stationary, being held so,

'as will later appear, either in the illustrated position or in a corresponding angular position on the opposite side of a vertical'line extending through the center of the pivot 100. The spring 29, as shown, is fully stressed. Consequently, when lever 35 is released, spring 29 will expand and move lever 35 to the right. This movement of lever`35 is limited by its engagement with a xed abutment 102 on cross bar 80. A similar abutment iS provided on bar 80 to define the extreme left hand or illustrated position of lever 35.

Assuming that lever 35 has moved to the right and engaged the right` hand abutment- 102, the valves 28 will have been 'reversed Ifrom the illustrated. positions and the right hand piston will start upwardly and the left hand one downwardly. As the right hand piston rod 24 moves upwardly, a spring 103, coiled therearound and resting on arm 7l, engages and lifts a member 104, through which the piston rod 24 slides. This member isconnected by a link 105 to one end of a lever 106, which is fixed at a point intermediate its ends to the rear end of a shaft 107. The latter is mounted in a bearing 108 formed on a frame 109, which is an integral part of `the cast pipe section 66. Fixed at a point intermediate its ends to the front end of sha ft 107 is a lever 110q the upper end of which carries a roll. 111 to ride in a recess 112 in the lower end of the above described lever 99. Thus. as rod 24 rises, levers 106 and 110 will be rocked in a counterclockwise direction, forcing lever 99 to swing clockwise.

' result is that the force of the spring on lever 35 will then be so directed as to tend to move the lever to the left, just as such force with the parts positioned as illustrated -in Fig. 9,`

is so directed as to tend 'to move lever 35 to the right. This lever 99 therefore has two functions,.to stress the drive spring and to position it properly so that it can move lever '35 in the proper direction at the proper time.

1In order to hold lever 99 stationary during the driving of lever 35 by'spring 29, the lower end of lever 110 i-s bifurcated, presenting two angularly spaced surfaces 113 and one or the other of such surfaces abut a iXed stop 114 on frame 109 at such times.

It will be noted that lever 106 is connected by a similar link 105 to a slidingmember 104 on the left hand piston rod 24 and that such rod carries a spring 103, whereby when' the left hand piston 21 is ascending, lever 106 can be rocked clockwise to cause a counterclockwise movement of lever 99 into the illusltrated position. The parts 104 are moved from the piston rods 24 throufrh springs 103 so that, after such parts have been. moved as far as possible (until one or the -other of the surfaces 113 has engaged stop 114), the springs can yield Aand permit continued upward travel of the piston rods to an extent suflicient to enable arms 84 to eect the release of the latches 34. f

From the lpreceding description, it will be clear that the measuring cylinders, and all of the mechanism associated therewithfor operating and cont-rolling the operation of the valvesthereo'f, are carried by the base casting 25. This -member may be vsupported in any suitable way. As an, illustrative example of one such way, the following supporting frame and enclosing housing for said mechanism may be used. Four pipe columns 115 yconnectbase casting 25 to an intermediate -member 116, which in turn is supportedI by threel pipe columns `117, from a base 118, adapted to be bolted to a suitable foundation.

A two part shell 119, of circular cross seetion, encloses th'e space between membersl 116 and 118 while a two part shell 120 of square cross section, encloses the space between base casting 25 and member `116.

lThese shells 119 and 120' are secured to the members, against which they abut, in the usual or anyisuitable manner. Thelower shell 119 is usually provided with vhinged doors, such as 121 and 122 which, when opened, uncover the openings 123 and 124,

respectively, shown in Fig. 8. Access'to the space within housing 120 is not ordinarily required and, in order to prevent convenient access thereto by way of opening 123, closure plates 125 and 125 are secured to the member 68 and ,housing 119, respectively, as shown in Fig. 8. The tubes 69, above described, are preferably closed at their lower ends to prevent manipulation of the piston rods 24, which at times extend below plate 125 and would otherwise be accessible through opening 123.

The measuring cylinders 20 may be mounted in any suitable manner. As shown in Fig. 7, each is surmounted by an annular ring 126 and asl shown in Fig. 6, across bar 127 extends vdiametrically across this ring with its ends resting thereon. A pair of tie rods 128, threaded at their lower ends into base casting .125, pass through ring 126 at opposite points thereon and through the overlying ends of cross bar 127. Long hexagonal nuts 129 are Athreaded on the upper ends of tie rods 128 and serve to clamp the cross bar to ring 126, the latter to the top oi' cylinder 20 and the cylinder to base 25. The rods 130 are dummy rods. The cross bar 127 serves'to support the described abutment 33, which is threaded into and therefore vertically adjustable with respect to the cross bar. Each measuring cylinder is preferably closed, as by a disc I131,.secured as indicated in Fig. 7, to ring 126. kThe upper ends of the two cylinders are interconnected by piping 132l which has an openingat 133 to the atmosphere. Usually a hood 134 surmounts the cylinders 20 and lower members 137 and 138, respectively, and

these members are secured together by cap screws 139. The member 137 is an annular ring and member 138 has a central upstanding cylindrical part extending into this ring to center it. The piston leather 136 is pressed against the wall of its cylinder 20 by a coil 'spring 140, mounted in a circumferential groove in member 128 and preferably stuii'ed with packing 141. The piston rod 24 passes through member 138 and through an overlying baiie plate 142 and is secured thereto by a nut which constitutes thedescribed abutment 32. Member 138 'has a central recess 143 of such size as to closely fit the described ioat 23, leaving freedom for just suicient 4vertical movement of the float to enable it to open vents 22 without passing out of the redess `to any extent. The vents 22, ofI which there are three, extend through the'upperwall of recess 143. The float slides freely onthe piston rod 24 and may rest at times on base 25. iVhensuch is the case, as liquid enters the base of a measuring cylinder, it carries the float upwardly as indicated in Fig. 5, and eventually into recess 143 into the-position shown in Fig. 3,-wherein all three vents are closed directly by the upper face of the ioat. To facilitate the outflowof air by way of recess 143 and vents 22, the lower face of member 138 vis slotted, as shown at 144. lThe arrangement is such that the volume of liquid which can ent/er into member 13,8 by way of grooves 144, recess 143, or aroundthe spring 140, is exceedingly small with reference to the volume displaced from a measuring cylinder by a full stroke of the piston and well within the tolerances of measurement usually permitted.

Liquid may be forced into the supply pipe 67 by any suitable means. l As an example of one of many such means, I show a hand operated pump (Figs. 7 and 8), having an oscillatable operating shaft 146, to the outer end of which is fixed a member 147. An operating handle 1 48 is pivoted at 149 to member 147 so that it may be swung from the position shown by dotted lines in? Fig. 8, wherein it is entirely enclosed in housing 119, to the 4position shown by full lines, wherein the handle lies suiiiciently outside the housing to enable it-to be rocked back and forth, in a plane 'at right angles to that in which it swings on pivot 149, to operate the pump. The pump 145 is supported, preferably ina manner such as to permit convenient removal, from a frame 150, secured as indicated to pipe columns 117. As shown, the pump has a dep-ending lpart 151 which is clamped between pairs of screws 152, mounted in a pair 4of upstanding lugs 153 on frame 150. The suction pipe of the pump is shown at 154 and is adaptedfm connection to an underground supply tank. Interposed in pipe 154 is a suitable filter 155, accessible through d-oor opening 124. The discharge pipe of the pump is shown at 156, and 157 is a by-pass from the discharge to the suction pipes around the pump. This by-pass is normally closed by awalve 158 which opens automatically. whenever the pressure of the pumped liquid in discliarge pipe 156 exceeds .a predetermined degree, and permits suchv liquid, or a part thereof, to return to the suction pipe 154.

lVhile the discharge pipe 156 might be directly connected to the above described pipe 67, I prefer to interposebetween these pipes an air separator. The separator .shown is of a known type and includes a tank 159 connected at its lower end to pipe 156 and at its upper end to pipe 67 and otherwise closed eX- cept fe' the outlet 160 in the top wall thereof.

Pipe 156 communicates at all times with a central upstanding pipe 161 in the tank and this pipe terminates near the top ofthe tank with an open upper end. Pipe 67 communicates at all times with a pipe 162 which extends downwardly iu the, tank, terminating near the bdttom thereof with an open lower end. Outlet is connected by a pipe 163 to a pipe 164, which extends downwardly in housing 119 and4 is adapted for connection to the top of the underground supply tank. Slidably encompassing pipe 161 is air-annular float 165 carryingr a valve 166, adapted when the liquid level in tank `159 rises su'iiciently,

to close outlet 160. At all other times. the

cape through outlet 160, 'the latter is connect-ed to the gasoline tank as described. Float 165 carries a cross -bar 167 which limits the downward movement thereof byengagement with the top of pipe 161. This cross bar passesdiametrically across, without closing oi the upper end of' pipe 161.

`Preferably, means areI provided for insuring that the measuring cylinders 2() are drained when pumping ceases. Of course, that cylinder 20, which happens to be connected 'to the` discharge passage, will empty itself into such passage becauseiioat 23 will open vents 22 and enable the draining. The other cylinder, which is then connected to the. inlet passage, might have been partially full when pumping ceased and, in ord-er to drain that cylinder, I connect to the inlet pipe .66, at some convenient point, a pipe 168 (Fig. 11) which extends upwardly inside housing 1,2() to about th'e level of the base of casing 25 and is there connected to the above described rcturn pipe164. v An air admission valve, or Siphon breaker 169 is connected Lil ceases, that cylinder 20 which is in communication with pipe 66 through the passages 45 and 65, will drain through pipes 16S and 164 and will be completely emptied. Liquid will also drain out of the inletpassage 45 and down to the level of the siphon breaker 169.

For the purpose of indicating the number of unit' measured quantities delivered from the apparatus, I provide a suitable register 170 and mechanism for operating .it in such a way that the register counts the number of operations of the valve lever 35. The register is supportedfrom the fram-e 109 by three studs 171 which are shown in section in Fig.

49. In Fig. 11, one of these studs has been lili ing the register and the shell has fixed thereto al Lringj175, which en'conipasses` the plate' 173 and conceals the opening. Fixed 'to' the inner face ofplat'e 17 3 is a frame 176 in; which theregister operating. shaft 177 is mounted.

vThis .shaft has fixed toits inner end aratchet ytwo i'ipwarilly diverging arms of this Y- shaped "lever carries a pawl' 181 for actuating the ratchet 178. A holding pawl 182 is pivotally mounted on stud 180 and these pawls are interconnected bya coil spring 183,

which lies in front of the ratchet (Fig. 11) and tends to hold both pawls in engagement therewith. The other of the aforesaid arms has a rearwardly projecting hub 184 which is connected by a link 185 to a fork 186. The latter-is adjustably secured to a rod 187 which is mounted for vertical sliding movement' in the hun of the bracket 101, above described. The upper end of rod 187 underlies one or the other of a pair of cams 188, formed on the lower end of valve lever 35, and is held in engagement therewith vby a spring 189 which connects a pin on said hub to link 185.

f The connection between rod 187 and fork 186 V177. The latter has a crank 190 (Fig. 11) on its outer end, the crank pin 191 of which engages the usual operating crank 192 of the register and crank 192 will, by the usual mechanism' (not shown) of the register 170, cause an appropriate movement of the register hand 193 (shown in Fig. 1). The ratchet is moved only during the first half of each movement'of the lever 35 and, on the other halt` ofsuch movement, rod 187 is permitted to rise -under the inliuence of spring 189, which causes pawl 181 to move back into its original position,-the ratchet 17 8 being held against movement bypawl 182. f

In operation, pump 145 is operated by oscillating handle 148 and liquid is forced upwardly through pipe 156, through the air separator 159, and thence through pipes 67 and 66l into passage 65 and finally into inlet passage 45. From this passage it will flow out through one of the inlet ports 44 '(that which isthenuncovered by the' overlying valve 28) into one of the measuring cylinders 20. The liquid, entering suchcylinder at a point beneath lits piston, raises such piston, first driving out through the vents 22,A

ifnecessary, any airl whichmay be in the cylinder. Then such air ha's'been substantially allfdriven out through vents 22, the latter are closed by fioat 23 and thepistonl rises. As one piston rises, the other is forced to descend dueto-the -intercounectionof the two piston rods by the chain 26 and4 springs 27. The descending piston normally reaches the lower limit of its stroke, and is arrestedby abutment with base before the rising piston reaches the upper limit of 'its stroke, with the result that continued upward movement of the rising piston causes springs 27 to be placed under stress. As soon as either piston reaches the lower limit of its stroke, the lock 36 is withdrawn-from holding engagement with disc 38, thus releasing the valve mechanism at this point. The latter, however, is not free to operate until the rising piston has completed its upward stroke, when that latch 34 which has been restraining lever 35 from movement, is released. lVhen both this latch and lock 36 are released, the drive spring 29 expands and-drives lever over and against the right hand abutment 102. This causes the valves 28 to be simultaneously moved and into such position as to connect the right hand cylinder 20 to inlet passage 45 and the left hand cylinder to discharge passage 43. The right hand piston then descends and pulls the left hand piston down to express from the left hand cylinder the liquid previously pumped therein. The discharge stroke of the left hand piston, however, is initiated much more suddenly because, just as soon as the valves 28 operate, the previously stressed spring 27 impart a spring impulse to such piston to start it on its downward stroke. Before the right hand piston has reached the upper end of its stroke, the'left hand piston, under normal conditions, will have completed its discharge stroke and released lock 36. Filling of the right hand cylinder continues until the piston therein is arrested by abutment 33, at which time the proper latch 34 is withdrawn from holding engagement with lever 35 and the latter is again moved by spring 29 into its left hand and illustrated position. Valves 28 are again operated to reverse the connections to the measuring cylinders 20 and the left hand cylinder begins to lill while the right hand cylinder discharges,the discharge being initiated as before by a spring impulse. The described action continues as long as pumping continues. On cessation of pumping, that cylinder which is then in the process of being filled will drain through pipes 164-and 168 and no liquid will ordinarily remain in either cylinder. This follows because it is usual to stop pumping after one piston has completed its discharge stroke and before the other has completed its filling stroke. In other words, one piston will be upper limit of its stroke and cause the release of lever 35 from latch 34. The lever 35, however, cannot then be moved by drive spring 29 because the shaft 39, to which it is fixed, will be held by lock 36 until the discharging piston completes its down stroke and abuts base 25 at which time vthe lock is released.

This double lock for the valve mechanism is of particular importance in an apparatus of this special kind, Where a spring impulse drive of the pistons is desired. Such drive necessitates the use of springs andA these necessarily can, under some conditions, yieldv at other than the desired times. The doublelock feature enables the desirable spring impulse to be used to initiatev the discharge stroke of the pistons without permitting-the pistons to get out of the desired timed relation. An apparatus of this .special type isv therebyrendered substantially fool-proof by the double-lock feature.

Aside from this feature, the valve arrangement is thought important particularly with 'respect to the mountin of the valves one in the base of each cylin er.- Inthis way, the

` piston abuts the upper face of the underlying necessary, as on cessation of pumping.

valve at the same time it abuts the base 25 and all liquid, except the small quantities in the` istonrecesses and grooves,l is forcibly expe ed, passing into the discharge passage 43,-from which all liquid can drain, when The invejntion has been disclosed herein, 1n

anembodiment at present preferred, for

illustrative purposes but the-scope ofthe invention is. defined by the appended claims rather than by the foregoing description.

What I claim is: 1. Liquid dispensing apparatus, comprising, a pairo'f measurin cylinders, a piston 1n leach of said cyliners, liquid forcing means, valve mechanism for alternately connecting said cylinders to said means and for enabling liquid to discharge from eitherV cylinder while the other is being filled, con-` nections between said pistons by which eachpiston when moved on its filling stroke by liquid entering one cylinder wi l'move the other piston to discharge liquid from the other cylinder, said rconnections including Y elastic means stressed by each piston during the latter part of its fillingstroke and initiating with a sprin im ulse the subsequent discharge stroke 0 suc piston, and means for locking said valve mechanism against operation until 011e piston has completed its filling'stroke and the other its discharge stroke.

2. Liquid dispensing apparatus, comprising, a air of measuring cylinders, 'apiston in eac of said cyliners, liquid forcing means, valve mechanlsm for alternately connecting said cylinders to said means and-` for enabling liquid to discharge from either' cylinder while the other is being filled, connections between said pistons by which each piston when moved on. its filling vstrokeby liquid entering onecylinder will move lthe other piston to discharge liquid from the other cylinder, said connections including elastic means stressed by each piston during the latter part 0f its filling strokel and initiating with a spring impulse the subsequent disvcharge stroke of such piston, and locking means for said valve mechanism releasahlc in 4 part by one piston when it reaches the end -of its filling stroke and in part by the other fixed limits, liquid forcing means, valve mechanism for alternately connecting said cylinders to said forcing means and for enabling either cylinder to discharge while the other is being lled, means interconnecting the pistons whereby either when moved during the filling of its cylinder will move the other to discharge. the liquid from its cylinder, Vsaid connections normally causing each piston to rach the fixed limit of its discharge stroke before the other piston reaches the fixed limit of its filling stroke, elastic means included in said connections permitting continued travel of either piston after the other has reached the limit of its discharge stroke, means for moving said valve mechanism, and means restraining the last named means from moving the valve mechanism until one piston has reached the limit of its fillingl stroke and the other Ipiston the limit'of its discharge stroke.

4:5 Il ofxcylinders, a piston in each cylinder mova liquid dispensing apparatus, a pair able between fixed limits, connections between j said pistons forcing them to move in opposite directions and arranged so that each pist0n normally reaches one of its limits before and means controlling theJtime of operation of said valve means and necessitating as a condition precedent to such opertion that the discharge stroke of one -and the filling stroke of for discharging liquid from such end of-one cylinder while the other is being illed,.where by one piston ismoved by theliquid supplied .to its cylinder under pressure-and moves thef other piston to force the liquid out of the other cylinder, means for arresting each piston at the end of its discharge stroke normally effective before the other piston has reached the end of its filling stroke, whereby said elastic means is normally stressed near the 'end of the filling stroke of each piston and imparts a spring impulse to such piston to initiate its discharge stroke, and means. controlling the time of operation vof said valve means and necessitating as a condition precedent to such operati-on that the discharge stroke of one and the filling stroke of. the other be completed.

6. In a liquid dispensing apparatus, a pair of upstanding cylinders disposed side by side, a piston in each cylinder having a piston rod depending through one end thereof, a flexible member, elastic means through `the intermediary of Awhich the ends of said member are connected one-to each piston rod, guiding means directing said member to travel in a path in part parallel and adjacent to one piston rod, across towards the other piston rod andv then parallel and adjacent to the last named rod, valve means for alternately, admitting liquid under pressure to the lowerends of said cylinders and for enabling one cylinder to discharge while the other is illing, whereby the liquid supplied to one cylinder raises the piston therein and through said flexible member lowers the other piston to forcibly expel the contents of the other cylinder, means for arresting each piston at the end of its discharge stroke and normally effective before the other piston has completed its filling stroke, whereby said elastic means will be stressed and impart an impulse to start each piston on its discharge stroke,y and two means for locking said valve mechanism one lof vwhich is releasable by either piston rod at the end of the upstroke thereof and the other of which is releasable by either'piston rod at the end of the downstroke thereof.

7. Liquid dispensing apparatus, comprising, a pair of upstanding measuring cylinders 65 mounted side by side, a pistonv in each cylinder havingl a 'piston rod extending through the bottom wall ofhits cylinder, oscillatory v-alves mountedone in the base of each cylinder for alternately admitting and dischargingliquidntherefrom', valve stems extending one from each valve throughthe base of its cylinder, means interconnecting said valve stems so that when one valve 1s in position to admit liquid to itscylinder the' other valve is in position to discharge liquid therefrom, a spring impulse mechanism for operating said. interconnecti'ngmeans first in one and then in an opposite direction, means operable by movement of said pistons for stressing said impulse mechanism, and means fory restraining said mechanism from moving said valves until one .piston reaches `the end of 'its filling stroke and the other the end of its discharge stroke.' y

1 8. Liquid ,dispensing apparatus, `comprising, a pair of upstanding measuring. cylindersV mounted side by side on a common base member, a pistonineach cylinder having a piston rod passing downwardly through Vsaid member, connections between said rods forcing them-to move in opposite directions,

oscillatory valves mounted in said 'member and located one in4A each cylinder with their stemsextending 'through and-'below said member, an oscillatory drive shaft and con- .nections betwen it and' said stems, spring impulse mechanism. located below. said member and between said rods for rocking said shaft iirstin one .and then in the other direction, two independentlyI operable .means for l locking said shaft against movement, means carried by each piston rod effective at' the `end of its upward stroke to release said shaft from one of said locking means, meanslcarried .by 'each piston rod effective at the end offits downward stroke to release the other of said means, and means operable .by the piston rods intermediate the ends of their c strokes to stress said impulse mechanism and render it effective when released to actuate said shaft.

9. In a liquid dispensing. apparatus, a measuring cylinder having a head provided with a valve/recess and intake and discharge ports inthe bottom wall of such recess, an oscillatory' diseva'lv-e mounted in said recess and seated on said wallA with its upper face flush with the upper facev of said head, said valve being movable to cover and uncover said ports in alternation, means for holding said valve to its seat against axial movement, and a piston' in' said cylinder having a ilntslower face to abut said head and valve.

10. In a liquid dispensing apparatus, aA

measuring cylinder having a head at one end thereof provided in'its inner face Awith a valve recess and with intake andl discharge ports leading into said recess, a valve in said recess mounted to turn but held against axial move-` Vment in said head and movable to cover and said Valve, the liquid pressure through thev luncover said vports in alternation, and a piston in said cylinder arranged to abut said face. of said head, the abutting surfaces of said piston andhead being complementarily formed to enable substantially all liquid between them to be expelled from the cylinder through the' adjacent discharge port,

` 11. In a liquid dispensing apparatus, a measuring container having in one end tl1ereof a valve seat with intake and discharge ports therein, a disc valve overlyingsaid seat and movable to cover and uncover said ports in alternation, means 'for supplying liquid under pressure to the intake port at all times while the apparatus is in operation including such times the intake port is covered by intake port tending to move said valve away fromv its seat, and means for holding said valve to its seat against said liquid pressure.

l2. In a liquid dispensing apparatus, a measuring container having in one wall thereof a valve seat and intake and discharge ports therein, adisc valve engaging said seat and movable to cover and uncover said ports in alternation, a ste'm for said valve turnably and slidably mounted in said wall and projecting therebeyond, resilient means for drawing said stem axially out-Ward to hold said valve tightly against its seat, said means including an interposed anti-friction bearing vassociated with the stem to enable the latter to turn freely although under the axially directed pressure of said resilient means, and means for turning said stem.

13. In a liquid dispensing apparatus, a

,measuring container having in one wall thereof a valve seat and intake anddischarge ports therein, a disc valve engaging said seat and movable to coverland uncover' said ports in alternation, a stem for said valve turnably and slidably mounted in said wall and projecting therebeyond,resilientmeansfor drawing said stem axially outward to hold said valve/tightly against its seat, and means for turning said stem including a member -slidablybut non-rotatably engaged with said stem, whereby the stem may move axially underthe inlluence of said resilient means without interference with the means for turning the stem.

In testimony whereof:I I have affixed my signature.

ALFRED L. GRIS.

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