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US2562552A - Measuring pump with flexible tubing - Google Patents

Measuring pump with flexible tubing Download PDF

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US2562552A
US2562552A US76476047A US2562552A US 2562552 A US2562552 A US 2562552A US 76476047 A US76476047 A US 76476047A US 2562552 A US2562552 A US 2562552A
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plate
tube
push
means
cams
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Henry Louis Joseph
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Henry Louis Joseph
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B43/00Machines, pumps, or pumping installations having flexible working members
    • F04B43/08Machines, pumps, or pumping installations having flexible working members having tubular flexible members
    • F04B43/082Machines, pumps, or pumping installations having flexible working members having tubular flexible members the tubular flexible member being pressed against a wall by a number of elements, each having an alternating movement in a direction perpendicular to the axes of the tubular member and each having its own driving mechanism

Description

.Buy 31, 1951 L, .I. HENRY 2,562,552

' MEASURING PUMP WITH FLEXIBLE TUBING Filed July so, 1947 4 sheets-sheet 1 FHM 23 79 I Iv-g, I 39 o as 49 55 4B l Bef/36 W A. 1

3e 32 ne F5 .3 31 79 2 33 /32 34' 30\ f `Fuly 31, 1951 L. J. HENRY MEASURINGPUMP WITH FLEXIBLE TUBING 4 Sheets-Sheet 2 Filed July so. 1947 FIGA- July 31,1951 J. HENRY 2,562,552

l MEASURING PUMP WITH FLEXIBLE TUBING Filed July .'50, 1947 4 Sheets-Sheet 3 Fls FIC-).9

July 31, 1951 J. HENRY MEAsuRING PUMP WITH FLEXIBLE TUBING 4 Sheets-Sheet 4 Filed July 50. 1947 Patented July 31, 19.51

uuiTED STATES PATENT OFFICE 2,562,552 MEASURING PUMP WITH FLEXIBLE TUBING Louis Joseph Henry, Paris/France AppriatibnJuiy'so, 1947,.,seria1- No. 764,760" In France March 11,1941

Section LPublficA Law 690, vAugust 8, 1946 Patent expires March '7, 1961 9 claims. (o1. 222-418) being: correlated Vin Suche manner that the ilexible tubing element which Vis thussubjected to theaction ,ofsaid members will behave-as a suctionor pressure pump barrel.

My pump makes it possible to, inject a pluralvity of liquids, Orliquids on one hand and any desired gases onthe other hand, in variable amounts according to the desires of the operator.

.The volume of flow of each of said liquids or 20 gases injected in this way is adjustable for each individual tube without it Ybeing required to Vary the speed of the motor provided to drive the pump.

As a result of the above-disclosed features, the pump according to my invention, makes it possible,.fcr instancato transfuse within agiven time .300 cc. vof blood, and in the samelapse of.

time and simultaneously therewithinject 10 cc.

Any -important feature of my new device is that the iliquids or gases being pumped do not enter into contact .with any .valve ortho like means: :they flow through simple rubber tubes which do not require any flubrication, as vdistinguished from .alternating pumps, vaned pumps, gear pumps, and the like. Inthis manner any `possi- .'bility .of :the products flowing in the apparatus mingling ywith foreign materials i s positively Dre- -clud`ed, this being of capital importance in medicinal applications.

A.Positioning and removal or the tubesmay be eieojted with the greatestof easewithout requiring the dismantling@ any mechanical member. `ltthus becomes an easymatterto cleanand sterilze 'the tubes whenever Vnecessary or desir- My apparatusmay bejormed with anysuitable .number of tubes. literals' by way 401E example. there is described vhereinafter an apparatus comprisinggtwo tubes `as diagrammatically shown yin the accompanying drawing:

j.- Fig, 1 is an elevational View of the apparatus assembly with parts broken away and in cross :125 section Online I-,I 0f Fig. 5-

Fig. 2 is across section on line VII--II of Fig. 4

-n itS,; leit-lnand side and an end i'iewy 0f the pump .proper in itsrighthand side. t

Fig., 13 is aside view of the same pump, one

ci an anaesthetic, the apparatus in such case 3 0 ...Se 40f .the .base being brOkIl @Warte Show@ comprising two tubes. The products may be injected separately, that is they may be introduced into different points of the patients body; both tubes could also be connected with a single hypodermicncedle, the proportioning of the injected uid then being veffected within the single tube interconnecting both the abovementionedtubes.

My apparatus may operate either -asfauartiiicial heart (theoutput of both tubes .then vbeing alternated, one` or the tubes being caused to 1aspirate while the other one discharges) oraspira'- tiony and discharge may be eectedsimultaneously, in which oase my apparatus may constitute a metering-mixing device in whichboth products being pumped are 'mixed-in fpredter? mined proportions through adjustment of both ratesoi iiow and throughout the entire-.duration ofthe discharge period.

As will be apparent fromthedisclosureeiven hereinafter in greater detail, the adjustmentgof ,Y

such adjustment being operable both C atrest-:and

when the apparatus is in use.

detail.

.Eig. -4 s hOWSVthe vsaine device partly in cross section Online IV-fIfQf Figi 2 ne, 5,15, in itsupper pain-ascensori une v-v of Eig. .f i, .and in its bottom part a section on line Fig. 46 shows the pcsitionoi the'control Acams controlling the obturating push-rods of one of .the .t ubes ,at the start of the suction phase.

'T shows the position of the control cams of the obturating push-rods of the other tube at the start of the delivery stroke.

elevation respectively one of the supportsof the tubeabutment plate,said support atthe same time serving foradjustingpurposes.

Fig l2 is an endview ofthe counter with which theiapparatusisprovided. Figs. 13 and 14 respectively are ay bottom; plan View and anelevational View oisaid counter. Figs. l5 and l-farean elevational and a-plah .yieW respectively of a ,detail Yof thecounter.

Ytling of the tubes 21. -ofcheck-valves and are operated alternately, one

synchronizing the suction and delivery strokes' or periods in each tube, or on the other hand for causing them to alternate, depending on particular requirements.

The device is supported on a base I which in turn serves as a support for a shaft 2 on which are secured cams 3, 4, 5, 6, (and 3', 4', 5', 6 forv the other tube). The shaft 2 is driven in rotation at a constant rate from an electric motor accommodated under the apparatus within a casing 1I upon which the base I is secured. Particular features of the control means from said Vmotor will be given hereinafter.

The cams 3, 4, 5, 6 are engaged by one end (which may be provided with a follower roller) Vof levers 1, 8, 9, I rigid with pins II, I2, I3 and `I4 which also support levers 1', 8', 9', Ill' actuating push-rods or members I5, I6, I1 and I8 respectively.

' The end push-rods I1 and I8 (see Fig. 5) are adapted to effect at the requisite moments throt- They serve the function of them pressing upon the tube to throttle it while the other one releases the tube to enable liquid or gas to iiow freely therethrough.

The push-rods I1 and I8 are slidable in xed guides and are maintained in engagement with.

their controlling levers 9 and I9' by springs I1' and I8 which at the same time are adapted to maintain the levers 9 and ID pressed against the cams and 6.

The push-rods I5 and I6 located between thel push-rods I1 and I8 are effective to flatten the tube 21 in the length thereof included between the end push-rods, in order to effect the discharge ofthe liquid or gas contained in the tube. Said push-rods I5 and I6 are connected with a pressure-plate I9 along which they are movable, the connection between said push-rod and said plate being for instance effected through a dovetail assembly which may best be seen in Fig. 1. The push-rods I5 and I6 are actuated synchronously by the levers 1' and 8 which in turn are controlled from the related cams and the thus obtained displacement of the push-rods and the plate I9 towards the tube 21 causes said tube to be clamped between the plate I9 and a fixed abutment plate 28.

When the plate I9 has reached the end of its `stroke or in other words when the discharge of a desired amount of liquid or gas has been effected by displacement of the plate I9, the latter is retracted by the action of a spring 24 acting through the medium of a link and a lever 26 upon a rod 24 guided in a recess formed in the post 23 and formed with an aperture 24'. It will be easily understood that the action of the spring 24" also results in maintaining the levers 1 and 8 constantly applied against the cams 3 and 4 from which they are controlled.

The just described control devicefor the plate I9 is devised so as to permit of adjusting the various gauges or thicknesses.

rate of iiow through the tube 21, such adjust. ment being effected by varying the amplitude of stroke of the plate I9. For that purpose, as previously stated, the push-rods I5 and I6 are movable along the plate I9. It follows that said vpush-rods according to the position occupied by them relatively to the central rod 24, are engaged by a point of the levers 1 and 8 which is more or less distant from the fulcrum axis of said levers. Consequently, the stroke of the pushrods I5 and I6 (and therefore that of the plate I9 with which they are combined) is also modified.

For such adjustment, it is necessary that the push-rods I5 and I6 be displaced by strictly equal amounts. For that purpose the displacement of the push-rods is controlled by a screw 20 formed with threads of opposite pitch acting upon the guides I5 and I6 of the push-rods I5 and I6. By rotating the screw 20 by means of the knobs 2l and 2I a simultaneous displacement in opposite directions by equal amounts is obtained for the guides I5' and I6 and therefore the pushrods I5 and I6. Such movement being effected either in a direction to bring the push-rods closer to the pivotal axis of the levers 1l and 8 or to space said push-rods further away from said axis.

The screw 23 is rotated in the walls 22 and 22' of the apparatus and is moreover supported in the central post 23. It may be provided with blocking means to set it in a required position.

The screw 2U could be replaced by a rapid adjustment device formed by a pinion rotating on the member 23 and meshing with sets of rack teeth one of which is rigid with the guide I5 and the other with the guide I6. By rotating the pinion, movements in opposite directions are imparted to the guides, which movements may be faster than those obtained with the screw having threads of opposite pitch as described previously.

The rubber tube 21 which so to speak forms the body or barrel of the pump, and on which the push-rods I1 and I8 act in the manner of check-valves, is clamped for the purpose of discharging the fluid contained therein, between the movable plate I9 and the fixed abutment plate 2S, as stated above. The abutment plate 28 remains stationary throughout the operation of the apparatus, but may be mounted so as to be adjustable and also to be foldable as will now be explained.

Adjustment of the plate 28 makes it possible to adapt the device for use with rubber tubes of Such adjustment is obtained by means of the following device.

The plate 28 is through the medium of a pin 29 mounted on two supports 30 and 30 which are freely slidable on the base I, said supports being guided by the side edges of the ports I which are engaged by the extensions 30"' of the supports 30 and 30'. Said extensions are formed as forks into which project levers 35 and 35 rigid with the shaft 36, rotatable on pins 31 and 31 rigid with the base I, as best shown in Figs. 2 and 3. A lever 38 is rigid with the shaft 36 and said lever is engaged by a set-screw 39, which screw may be actuated by means of an adjusting knob 4D and is threaded into the side wall of the base I. The supports 30 and 30' are maintained in place on the base frame I by means of strap members 4I and 4I with which they are made rigid through screws 42 or any suitable equivalent means.

It will be readily understood that when the screw 39 is actuated the assembly comprising the estes-eg supportsU .'50v and 3B' and the abutment plate-28, may be advanced or retracted and consequently thepush-rods l `and I6 may be made to suiiciently flatten down the tube 21 to obturate it Without however crushing it to the point of injury, whatever the thickness of said tube may be.

Moreover, the abutment plate 28 may be completely folded back to enable removal or insertion of the rubber tube 21. For that purpose said plate may be rotated about the axis 29 to assume the position indicated at the left of Fig'. 1. As shown in this figure, the supports 35 and 30 are formed with notches 3U, therebyenabling the tube 21 to be inserted (or removed) when the abutment plate'28 is in folded back condition. As a result of this arrangement, positioning and removal of the tube may be eiected without even having to look at it and possibly in complete darkness.

The abutment plate 28 is maintained in its operative position (as shown at the right of Fig. 1) by two'latches 32 and 32 (See in particular Fig. 5) engaging recesses 3l and 3l' formed in the supports 30 and 58'; a spring 33 urges the latches into their recesses; actuating lugs 311 and Sil' formed at the ends of the latches allow them to be extracted from out of their recesses by compressing the spring 33 when it is desired to clear the abutment 28' in order to remove or insert a tube 21. When the latches engage their recesses, they are effective to block Vthe abutment plate 2B in the position to which it has been brought in the above-described adjustment and they enable it to withstand the pressure exerted by the tube 21 when the latter has been compressed by the push-rods I1, I8 and the pressure plate I9.'

Itis important that the operator have a correct knowledge of the amount by which the rate of flow through any given tube is altered when the set screw 2li causing longitudinal displacement of the guides l5 and It and thereby the push-rods I5 and I6 together with the plate i9, is actuated. This result is obtained by means of an indicating device (Fig. 18) comprising an indicator arm or needle 45 movable in front ofV a graduated scale on a dial. If said indicator arm were displaced proportionally with the amplitude of dispalcement of the guides i5 and I 6 it would be necessary to provide a non-uniform spacing between the scale-graduations of the dial, since the rate of flow through a cylindrical tube is not varied in a directly proportional manner in response to the degree of Iiatening to which it is subjected by being clamped against a planar surface. To overcome these drawbacks a correcting device is provided which comprises a cam 43 mounted on the wall of the base l by means of a pin 44 on which it is freely rotatable; said cam is engaged by a finger 45 rigid with any one of the guides I5 or I6. It will easily be understood that the contour of the cam 43 may be so calculated that the indicating arm d6 will be caused to travel through equi-spaced scale graduations even though the corresponding length of stroke of the cam controlling guide may have been subjected to irregular variations.

It goes without saying that without altering the basic organization of the invention, it would be possible to actuate through the medium of a gearing or a gear train controlled from the cam 43, a second indicator arm serving to indicate a fraction ofthe main scale graduations. Also two cams could be used each controlled from one of theguides I5 and I6' so as to make it possible to ascertain without requiring any calculations,

tnefrateloffnw for a predetermined adjustment throught two` tubes of different diameters.'

The device moreover' comprisesla flow registeringand totalizingdevice'adpated to automatically compensate for'anydeviations inthe rate of flow such as may .be causedv by the displacement-f theguides I5 and I6. Saiddev'ice is essentially formed'bya counter 41 of any suitable type-con-` trolled byaV lever llvadaptedto transmit to it the impulses' 'received from a toothed ratchet 49: adapted to rotate the drum` of the counter byanamountfequivalent to one digit per tooth.V

l'Iheratcliet-lilV1 is Vdriven through amechanical connection formed by a spring 50 having-juntaposed turns wound-around a cylinder 5l rigid with the ratchetllil'yandl one end of which isy blocked by means ofav screw '52 on a lever52insuch a way thateach impulseofthe iever 52 which tendslto' tighten the spring 5d around the cylinder 5| causesthe latter to be rotated,-whi1e in thereverse movement, tending tounwind or release" the spring -ythe latter mayA rotate freely around the" cylinder 5l without-driving "the latter. Y n

*A' second spring 535wo'und in an opposite direc'` tion around the cylinder 5I and one end of 'which' is blocked on theframe 54 of the driving device with a s'crew5", allows the ratchetjfl!) to-'be' rotated freely whenl urged by the spring 5B, but effectively blocks theratchet when lthe spring! 50 is moved in the reverse direction.

1A-link25 connectstheflever 52 on which it acts through the medium ofa pin 55, Vwith a lever-'2G to which it is xed by a pin 56; the'leveri-Z- is pivote'd on the base l by means of a pin 28 andreceives the impulses from the guide rod '522' formed for that purpose (as previously stated) with an aperture-245' into'which extends thelfree end of tl'1'e---lever'2'5.Y Areturnspring- 24v (Fig-'sb' 1\3- and 14) rigid at one of its ends withA thel lever' 52 vrand -at its oppositeend withv aV ratchet wheel 51 adapted to Vbe blocked by means ofa pawl- 58 pressed by a spring 58 and rotatable on the' pin'59 rigid with? the frame 5fi,'retrac'ts the'. lever 52 after each impulse received. from the plate {Sith-rough the guide rod '2G from the lever 2B and the link 25; saidv spring at the same time ret'racts the vplate I9 against the push-rods l5 and i$,which in-turn act upon the levers.1-1" and B- to apply them against the earns- 3; and/l; The ratchet wheel 5T which is rotatableon the pin 60 carried bythe frame 54' enables adjustment of the tension of the return spring 2li".

As explained in greater .detail hereinafter', the above described counter functions as a totalizer' for fractions of a digit.

The frame 54 (which supports theratchet 51 and related elements) and the counter 'e1 are secured on-.theicasing' El supporting the base l and serving-to house anV electric motorZ controllingthed'evice.

The motor 62 has beenespecially devisedfor: use in connection with my apparatus as used for medicinal purposes. This specific application of the device requires an arrangement such as to positively preclude the possibility of any contact at any time between the oil necessary to lubricate the motor and the members through which the liquids or gases to be injected are circulated. This'result is obtained according to the invention through the useof an oil chamber 63 devised sowas toproduce the lubrication of a train of gears without necessitating renewal or replenishing of ther lubricant. To that endf a suiiiciently large amount ofthe latter isV contained in the lower part of the motor casing which forms a sump or chamber 63 the shape of whichis determined so that the oil level may at no time reach the bearingk for the motor drive shaft, which bearing seals said chamber, and this being true for any position of the motor. In other words, the apparatus may be turned upside down, or placed on its side, or generally may be madeto assume any position whatever without the possibility of any oil escaping through the bearing, said chamber being moreover completely oiltight everywhere else.

In order to prevent the oil from rising in the motor under the effect of air pressure, resulting from the heat evolved in the motor in operation, there is provided a tube through which the motor chamber is vented to the atmosphere; said tube is arranged in such a way that the level of oil can never` reach its inlet in the chamber.

Said special motor is also characterized Yby an arrangement ensuring a particularly eicacious guiding of its shaft. As shown in Fig'. 1, the drive shaft proper 65 driven from the rotor 64 is a tubular shaft; it is supported in a lower bearing 66 and guided in an upper bearing 61. Said shaft has secured thereon a pinion 68 which engages one or more pinions 69 rigid with pinions 10 which in turn drive a pinion 1I rigid with a shaft 12 rotatable within the tubular shaft 65. Said shaft 12 rests on a thrust bearing 13; it is guided throughout its entire length and drives the shaft 2 carrying the control cams.

In a modification of the device, the connection between the shaft 12 and the shaft 2 is effected through a free-wheel arrangement allowing the shaft 2 to be rotated by hand without driving the motor. f

In the above the control of only one tube 21 has been described; the apparatus illustrated is provided with two tubes, and, as stated above, the mechanism described is simply duplicated, with the exception of the motor and the shaft 2, which in this case supports a second set of cams.

The pump may be operated to suck and discharge synchronously or alternately through both tubes (in the latter case one tube effects aspiration while the other one discharges). This result may be obtained very simply by means of the device now to be described and more particularly illustrated in Figs. 8 and 9.

In order to modify the manner of operation of the pump, it is simply necessary to change the setting of the second set or trains of cams 3', 4', 5', 6 designated by the general reference 14 in Fig. 8. For that purpose, said set of cams is driven by means of a retractable key 15 accommodated in a chamber 15' formed in the thickness of the shaft 2 and subjected to the action of two springs 16 and 16' which urge it into engagement, according to requirements, in either one of two grooves 11 or 11' formed in the thick.- ness of the set of cams.

The previously mentioned cams 3, 4, andv 6 form a first set or train rigid with theshaftZ; the second set of cams 14 may, with respectto said first train, be so adjusted that theaction Iof both tubes may be synchronized or? on the other hand alternated. To modify the setting of the train of cams 14, there are provided flats 18, 18 extending perpendicular toeach of the grooves 11 and 11 as shown in Fig. 9, said flats making it possible to expose said grooves while being in tangential relation with the'innerfdi- .ameter of the bush in which the shaft 2 is roltatable. A push-rod 19 formed-by a 4plate bent of the latches 32 and 32.

in the form of a U (Figs. 8 and 9) is arranged to extend between each pair of cams of the train 14 so that'it may, when caused to slide in its housing formed in the post 23, engage the retractable key 15 to expel it from out of that one of the grooves in which it is engaged. A spring 80 restores the push-rod 'I8 to its rest position when no longer compressed.

It will readily be understood that if the pushrod 19 is pressed while the shaft 2 is rotated. the ends of the push-rod will, at the instant where the fiat is presented before them, engage the key 15 and will expel it from out of the groove in the train of cams 14; the latter will then no longer be driven through the key 15 and will stop, since the push-rod, through the pressure exerted by it on the flat, will iniznobilize said set of cams, the shaft 2 still remaining freely rotatable. In this rotation of the shaft 2, the key 15 will encounter the groove which was free and will at once project thereinto, whereby the train of cams 14 will once more be rigid with the shaft 2 and the drive of said set of cams will once more be effective. At the same time, the push-rod 19 is expelled by the action of the flat applied against it and acting as a cam.

The result of this operation is that the setting of the train of cams 14 will have been altered with respect to that of the train formed by the cams 3, 4, 5 and 6. This alteration in the setting will obviously be obtained each time that the push-rod 19 is pressed during the rotation of the shaft 2.

The shaft 2 may be extended beyond the upper plate of the frame I to receive a crank thereon, enabling the device to be operated manually in case of a power breakdown. Also a pulley (or a pinion) may be adapted thereon to serve for the drive of an accessory device through a drive belt or chain.

The operation of the apparatus as described is as follows:

The abutment 28 being swung back, the rubber tube 21 is brought opposite to the push-rods I1, I8 and to the pressure plate I9 by causing it to rest in the notches 35" in the supports 39 and 39 which maintain it in proper position (see Fig. l). The abutment 28 is then raised and blocked on the supports 39 and 38 by means If necessary the abutment 28 is then adjusted. For that purpose the screw 39 is unscrewed and the end of the tube corresponding to the intake side is dipped into a suitable liquid; the apparatus is then started and the screw is tightened until the liquid is aspirated and discharged by the tube. The apparatus is then in adjusted condition. Aspira-` tion and discharge are caused by the associated action of the pressure-plate I9 and the pushrods I1 and I8. Since the apparatus is reversible, the intake may be effected at will through either end of the tube. It will be assumed for example that the left hand end of the tube (as seen in Fig. 5) is used for intake: In this case, the device operates as follows:

The push-rod I1 having been actuated by operation of the cam 5 and levers Sand 9', until it has completely obstructed or throttled the tube 21, the plate I9 which was pressing the tube after it had flattened it out, is retracted by the action of the return spring 24' which pushes In such conditions,

.the tube under the eiect oi thefsuction, pro.-

the tube. When the plate I9 has,v been com:-

pletely retracted and consequently the suction eiect has reached .its maximum value, the push.- s.

.rod I8. `is brought to the. position causing throttling `f the tube,v While the. push-rod I7 on the other hand is retracted. At the same time, the plate I9 is caused to. clamp the tube 21 against the abutment plate 2t, thereby causing discharge of the, uid by compression of the tube. rlhis intake and discharge cycle isv repeated' as long asfthe device is in operation.

,If .thedirection 1of rotation of the camslis reversed,v the flow of duid in the tube is also re versed.

The rate of` ow may beadjusted by means of the screw 2i) with opposite screw .threads which is adapted to bring the push-1'odsI5 and I5 closer to. or further away from the pivotal axis of` the levers 'I'r and 9'; the amplitude of stroke of said pusherods (and therefor that of the. clamping, plate I9) is thus altered. It will be easily understood that the more closely spaced are the push-rods with respect to the ends of the levers, the Vlarger will be theamplitudev of the. movements of the plates I9; conversely, as said push-rods are brought closer to the fulcrum axes of the levers, said amplitude will be decreased until it becomes Zero as the push-rods pass exactly through the axis of 'the levers.

The.y variation of the stroke of the plate |91 is eective toproduce a more or less pronounced collapse of the tube and consequently to alterthe rate of ow. v

It is obvious that this method of adjustment is such that the rate of `flow in each tube is independent from the rate of rotation of the cams. This makes .it'possible to adjust once for -all ysaid rate of rotation and thereby makes it possible to use a synchronous motor permitting a strictly stable rate of rotation and consequently a uniform rate of ow, which is particularly valuable and desirable in medicinal use.

As indicated in the course of the disclosure, the apparatus may be adapted to act on any desiredA number of tubes; when two tubes are used, it may be desirable, to synchronize their deliveries or on the other hand to cause them to alternate. This possibility makes it possible, Without modifying the rate of rotation of the motor, to double the frequency of the pumping action. Thus, for instance, if the apparatus is established to provide eighty aspirating anddelivery cycles per minutefor each tube, both tubes operating alternately, the total frequency will .be brought up to 160 pulsations per minute or may be reduced to 80 if the tubes are operated synchronously, that is if they aspirate and deliver at the same times.

Inorder to alter the frequency, or in other words to Synchronize the action of the mechanism in both tubes, or on the other hand to cause such actionto alternate in both tubes, ,it is simply necessary, the apparatus being in operation, to press Von the .push-rod 19 to automatically-produce in the above-indicated ,manner a change in the relative setting of .both trains of cams. At each push exerted .on the push-rod 19, there will be produced a .different combination in the kcon-- trolof the levers acting on said tubes.

The flow indicator shown in Fig. v18., for a given gauge `of tubing, allows the apparatus to. be adjusted so as ,to deliverany desired volume .of liquider gas. 'If lit becomes necessary to use .-a

,istics may kresult from thefact that, therate of ',flow

of the tube ,is varied with Athedisplacement V.01T the push-rods I5 and I6 along the levers 'l' and 8. The counter in question is adptedto register the number of strokes or cycles performed by the plate I9. But, sincev those strokes ,are not, all o f the same length it is important that the counter should register one vadditional digit `only when the sum of several rstrokesoi? the plate I9 has given rise to the deliveryy through the tube 21, of a predetermined amount, for instance 1 cc.` Such lresult is obtained by the'action of the compensating device whichoperates as follows; The lever 26 transmits to the lever 52 through the medium of the link 25, the impulses received fromjtlie plate I9; in turn the lever 52 drives the ratchet 49 through the-agency of the spring'SD. Asprovlously described' for -one direction .of movement of the lever 52, thespring-fis blocked onthe Acylinder 5I and is effectiveto drive it, while, in the opposite direction, it releases said :cylinder which is then blocked by the spring 53. Each time the ratchet'49 has vadvancedby the-amount 'ofl one tooth, the lever 48'whi'ch Vtransmits the movement to the counter YII'I througlfialink 48 causes one step of advanceof thefunits drum of the counter andthe latter then totaliz'es the Y-riuinber ofY irripulses. But, when thefpurnp is adjusted, in'such a Vmanner that a certain number 'of strokes of vthe plate I9 iisirequired to produce the 1deli-.very of onel unitof-'volum'e (1`cc.for eX- ample), the gear of the counter only'Y advances, at eachl impulse receivedfromVv the "lever 26, by an amount `corresponding to the; amplitude of i the movement o1y said lever (the, lever ZBfre'rnaining stationary inthe limitingcase where the plate' I9 is adjusted for a Vrateof flow vthrough the tube equal tenero); each-Strokeofthe plate I9 of'an amplitudesmaljler than that Which'would cause the deliver-y of Vone unit volume, feed `the ,ratchet 49, by a fraction of atooth space and :saidi ratchet remains in such l3nsit-ion' until a-A I iew` stroke vof theplate I .9. causes Yitfto be fed by anew-fraction. Whenthe total of elementaryrimpulses thus ini-f parted tothe ratchet-49amountsfto one unit, said ratchet is yadvanced by one tooth `and causes the indication ofan additional unit inthe drumsrof the counter. l a modification of the inventionthe tube of uniform .gauge described abovesreplaced by a tubev comprising, in the `portion :thereorforming theloumpbarrd, a resilient bulb. ion Whichthe pressure producing-delivery is adapted .to be GX,- erted; in this case, said bulb should-be actuated on both sides thereof, -and .simultaneously the plate I9 and the abutment zshould be controlled- What I claim is:

1. In a `device iorpumping medicinal uids in combination a nat abutment ,surface adaptedto xedly removably receive a length ,oi ,flexible .tub- 11115 .thereagainst, a movable guided pressure-plate adapted to be moved towards :andawayfromsaid 11 abutment surface,` aspring-urged push-rod cooperating with said abutment surface beyond each end of saidv pressure-plate to' throttle a related point of said tube thereagainst, a camshaft With suitably slettable cams thereon, means to rotate said' camshaft, foreach of said pushrods a follower lever,v means co-operating with one of ksaid cams tocontrol said push-rod, a pair of levers each having'aflxed fulcrum and provided with a follower arm and an actuating arm, said follower arm cooperating with a related cam, two movable projections on said pressureplate each co-,operating with a related one of said actuating arms and adjustably movable on said pressure plate, in relation to said fulcrum of said last-mentioned]A levers to cause said pressureplate to be actuated to a variable degree towards said abutmentsurface, flow-indicator means including a scale graduation and an indicator arm operatively `connected to said movable projections on said pressure-plate to indicate the degree of adjustment thereof with respect tothe fulcrum points of said last-mentioned levers whereby to be responsive to the degree of actuation of said pressure-plate, said operative connection `including a `cam deviceVw of suitable profile whereby the displacements'of saidl indicator arm on said scale may be lmade to beproportion-al with the actual rates of flow throughk said tube forthe various degrees of actuation of said pressure-plate, the setting of said cams 4being such as toI produce: a suitable sequence of operation of said pressure-plate and said push-rods to effectively pump fluidthrough said tube.

2. lIn a device for pumping medicinal fluids in combination 9, flat abutment surface adapted to nxedly receive a length of flexible tubing thereon, a lreciprocable pressure-plate adapted to be reciprocated towards and away from said pressureplate, means to adjust the amplitude of said reciprocation, spring-urged push-rods co-operating with said abutment: surface beyond each end of said pressure plate to throttle a related point of said tube thereagainst," a camshaft with suitably settable cams thereon, an electric motor to drive said camshaftvat a constant rate, means to control said pressure plate and each oneof said pushrods from 'a respectiveone of said cams, the setting of said cams being such as to cause a predetermined' pumping sequence of operations of said pressure-plate and said push-rods to pump fluid through said tube, a counting andl totalizing means to register the total amount of fluid pumped through said tube, said means comprising a, registering wheel, a ratchet adapted when and only when advanced by the space of one tooth to advance said registering wheel by one digit, and means to cause each actuation of said pressure-plate with'r'espect to said abutment sur,- 'faceto cause a corresponding ,advance of said ratchetthe arrangement beingV such that said ratchetlis caused vto be -advanced by the amount of onetooth thereof for va number of actuations of said pressure-plate corresponding to the passing of one unit volume of fluid through said tube.

3,.. In a, device for pumping medicinal fluid and the ,likejin combina/tion a flat abutment surface adapted to flxedly receive thereon a length of resiliently flexible tubing connecting with a supply of fluid to be pumped and with a means for utilizing said fluid, a reciprocable pressure-plate adapted to be variably reciprocated towards and away from said abutment surface to variably throttle said length of tubing, means to iadui? 'lli thel amplitude of reciprocation of said plate and thereby the degree of throttling of said tube and means to indicate said adjusted amplitude and thereby the amount of fluid flow through said tube at each |actuation of said pressure plate, spring-urged push-rods co-operating with said abutment surface beyond each end of said pressure plate to completely throttle off a related point of said tube, a camshaft with suitably settable cams thereon, control means from each of said cams to said pressure plate and each of said push-rods respectively to operate the same in a pre-determined pumping sequence as'determined by the setting of said cams, an electric motor, a sealed housing for said motor, the lower part of said housing forming an oil sump, gearing connections from said motor to said camshaft operating in said oil sump, the arrangement being such as to prevent any escape of said oil from said sump for any position of said device.

4. In the device as claimed in claim 3, means for venting of said sump to atmosphere to prevent a rise of oil therein under the effect of pressure of air heated by the operation of the motor.

5. In a device for pumping medicinal fluids and the like in combination two flexible tubes with resiliently collapsible side-walls each connected with a respective supply of fluid to be pumped on one hand and a means for utilizing said fluid on the other hand, means for removably supporting a length of each of said tubes against a flat abutment' surface, for each' of said tubes a pressure plate adapted to be variably reciprocated towards and awayfrom said abutment surface to variably throttle said tube thereagainst, means to adjust the degree of reciprocation of said pressure-plate and means to indicate the degree of said reciprocation and consequently the amount of each fluid flowing through each of said tubes at each reciprocation of said pressure-plate, spring-urged push-rods co-operating with said abutment surfaces beyond each end of said pressure-plate to completely throttle a related point of each of said tubes thereat, a common camshaft with two series of cams thereon one for each tube, a motor to drive said camshaft, control means for one of said cams of each series to a respective pressureplate and from cams of each of said series to re-A lated push-rods of a respective tube, means for setting each of said series of cams so as to cause a suitable pumping sequence of operations of the related pressure-plate and push-rods` to pump said related fluid from said supply to said utilization means through said related tube, and means for altering the relative setting of both said series of cams with respect toeach other while said camshaft is in rotation, so as to selectively obtain a relative timing such that'said pressureplates and push-rods for both tubes are operated in unison to simultaneously deliver their respective fluids through said tubes, or alternatively to obtain a relative timing such that the respective fluids` are delivered alternately through both tubes. y

6. The device as in claim 5, wherein said means for selectively altering the relative setting between both said series of cams comprises a pair of angularly spaced longitudinal grooves in said camshaft opposite to one of said series ,of ca-msga retractable key adapted to engage any one .of said grooves selectively to cause Asaid series of cams as a whole to becoupled withV said camshaft in aA related one of two ',angularsettiogs with respectif@ the Other series of cams. and

13 means for retracting said key while said shaft is in rotation to allow said setting to be automatically altered.

7. In a device for pumping medicinal iiuids and the like in combination a supporting frame, two flexible tubes each connectable with a respective supply of fluid on one hand and with means for utilizing said fluid on the other hand, means for removably supporting a length of each of said tubes horizontally at each side of said supporting frame, an abutment member for each of said lengths of tubes latchable in an operative vertical position to engage a generatriX of said tube and pivotable to an inoperative horizontal position to enable the removal and insertion of said tube, for each of said tubes a reciprocable pressure-plate adapted to be variably horizontally reciprocated towards and away from said abutment plate to variably throttle said length of tube thereagainst, means to adjust the degree of reciprocation of said pressure-plates, and means to indicate said adjusted degree of reciprocation calibrated in units of volume flow per unit of time, spring-urged push-rods co-operating with said abutment plates beyond each end of said pressure plates to completely throttle a related point of said tube thereat, a common vertical camshaft rotatably mounted centrally of said frame with two series of cams thereon one for each tube, control means from the respective cams in each series to the pressure plate and the push-rods of a related tube, means for setting each of said series of cams to cause a suitable pumping sequence of operations of said pressure-plates and said push-rods for each tube, and means for altering the relative setting between both said series of cams while said camshaft is in rotation so as to obtain selectively a simultaneous or an alternating delivery of fluid through both tubes, totalizing counter means for registering the amount of uid ow through each tube, a synchronous electric motor housed under said supporting frame in a casing, an oil sump formed in the bottom of said casing containing a substantial amount of oil therein, bearings in said casing for the driveshaft of said motor, and means to positively prevent said oil from leaking through said bearings into said supporting frame.

8. The pumping device as in claim 7, wherein said drive-shaft of said motor is a tubular shaft co-axially surrounding said camshaft and adapted to drive the latter through a train of gears arranged to work in said oil-sump.

9. In a device for pumping iiuids in combination a fixed abutment surface adapted to iixedly removably receive a length of iiexible tubing thereagainst, one end of said tubing communicating with a source of fluid to be pumped and the opposite end with a means for utilizing said duid, a reciprocable pressure-plate to be moved towards and away from said abutment surface, guiding means for said pressure-plate, rst pushrods each having an end engaging said pressureplate, second push rods each cooperating with said abutment surface beyond each end of said pressure-plate adapted when actuated to flatten out and throttle a related point of said tube against said abutment surface, guiding means for said first and second push-rods, spring means for urging said rst and second push-rods away from said abutment surface, a rotatable camshaft, settable cams on said camshaft, follower levers cooperating with each one of said cams, pins associated with and secured to a related one of said levers respectively, actuating levers xed on each of said pins and each cooperating with a related one of said push-rods, and means for displacing said rst push-rods in reverse directions with respect to each other substantially along the related ones of said actuating levers thereby causing said pressure-plate to be moved to a variable extent from said pins through said actuating levers according to the adjustment of said rst push-rods with respect to their associated actuating levers, the setting of said cams being such as to provide for a predetermined pumping sequence of operation of said pressure-plate and said second push-rods to cause pumping of said fluid from said source to said utilization means, and a constant speed driving mechanism for operating said camshaft.

HENRY, LOUIS JOSEPH.

REFERENCES CITED The following references are of record in the file of. this patent:

'UNITED STATES PATENTS

US2562552A 1941-03-07 1947-07-30 Measuring pump with flexible tubing Expired - Lifetime US2562552A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR2562552X 1941-03-07

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US2562552A true US2562552A (en) 1951-07-31

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US2562552A Expired - Lifetime US2562552A (en) 1941-03-07 1947-07-30 Measuring pump with flexible tubing

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2816514A (en) * 1954-09-17 1957-12-17 Designers For Industry Inc Vibratory pump
US4042153A (en) * 1973-03-14 1977-08-16 Standard Oil Company Liquid dropping device
US4365943A (en) * 1979-04-06 1982-12-28 Eldex Laboratories, Inc. Multichannel pump
US4818186A (en) * 1987-05-01 1989-04-04 Abbott Laboratories Drive mechanism for disposable fluid infusion pumping cassette

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US231795A (en) * 1880-08-31 Measuring-pump
US2105200A (en) * 1934-04-25 1938-01-11 Hugh G Phelps Surgical pump
US2285974A (en) * 1941-01-08 1942-06-09 Downingtown Mfg Co Pump structure
US2393838A (en) * 1943-11-10 1946-01-29 Foundation For Clinical And Su Drop by drop pump
US2412397A (en) * 1943-12-31 1946-12-10 Lyndus E Harper Flexible tube pump

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US231795A (en) * 1880-08-31 Measuring-pump
US2105200A (en) * 1934-04-25 1938-01-11 Hugh G Phelps Surgical pump
US2285974A (en) * 1941-01-08 1942-06-09 Downingtown Mfg Co Pump structure
US2393838A (en) * 1943-11-10 1946-01-29 Foundation For Clinical And Su Drop by drop pump
US2412397A (en) * 1943-12-31 1946-12-10 Lyndus E Harper Flexible tube pump

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2816514A (en) * 1954-09-17 1957-12-17 Designers For Industry Inc Vibratory pump
US4042153A (en) * 1973-03-14 1977-08-16 Standard Oil Company Liquid dropping device
US4365943A (en) * 1979-04-06 1982-12-28 Eldex Laboratories, Inc. Multichannel pump
US4818186A (en) * 1987-05-01 1989-04-04 Abbott Laboratories Drive mechanism for disposable fluid infusion pumping cassette

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