US2452467A

US2452467A - Slidable abutment rotary pump

Info

Publication number: US2452467A
Authority: US
Publication date: 1948-10-26
Anticipated expiration: 1965-10-26

Description

Get. 26, 1948. J JOHNSON 2,452,467

SLIDABLE ABUTMENT ROTARY PUMP Filed Dec. 1, 1942 I 3 Sheets-Sheet 1 INVENTOR. Jkmss F/Zmvsow Oct. 26, 1948. J. P. JOHNSON SLIDABLE ABUTMENT ROTARY PUMP 5 Sheets-Sheet 2 Filed Dec. 1, 1942' INVENTOR.

Oct. 26, 1948. JOHNSON 2,452,467

Filed Dec. 1, 1942 SLIDABLE ABUTMENT ROTARY PUMP 3 Sheets-Sheet 5 IN V EN TOR.

claws R Jamwsow Patented Oct. 26, 1948 ZASZABF STATES P'ihNT r'ics SLIDABLE ABUEMEN '1 ROTARY PUMP James P. Johnson, Shaker Heights, Ghio Application December 1, 1942, Serial No. 467,510

17 Claims. (Cl. 103123) This invention relates to rotary pumps and more particularly to small capacity pumps especially adaptable for use on aircraft, in delivering, under suitable pressure, anti-icing fluid to slinger rings on propellers although its construction lends itself to other uses obvious to those skilled in the art.

This application is a continuation in part of my co-pending application Serial No. 360,630, filed October 10, 1940, now abandoned.

An object of the present invention is to provide a pump of the type referred to having a non-circular rotor cooperatively associated with a relatively non-rotatable .blade or vane, the latter being mounted for reciprocatingmovemerit and actuated by the rotor to minimize the number .of moving parts.

Another object of the present invention is to provide a rotary pump having a fluid inlet opening and a pair of outlet openings, with pumping means so arranged as to meter and discharge the incoming fluid in equal quantities and at .equal pressures from both .ou'tle't openings,

Another object of the invention is to provide a rotary pump of the type referred to in which the number of inlet openings and the number of outlet openings may be varied relatively to .adapt the pump to different conditions.

Another object of the present invention is to provide a rotary pump, the capacity of which may be varied within definite limits in 'a quick and simple manner depending upon the requirements.

Another object of the present invention is to provide a removable insert held in operative posit-ion Joy a cover member and in which the rotor, blades, and porting are so positioned relattvelytha't production and assembly are materially simplified as well as effecting increased eniciency in operation.

Another object of the present invention is to provide a rotary pump of the type referred to which is simple in construction, eflicient in operation, and inexpensive to manufacture and assem'ble.

With the objects above indicated, and other "objects hereinafter explained in View, my invention consists in the construction and combination of elements hereinafter described and claimed.

- Referring to the drawings:

Figure 1 is a side elevational view of a rotary pump embodying the present invention, the same being driven by an electric motor.

Figure '2 is a transverse sectional view taken Cir 2 along .line 2-2 in Figure 1 and showing details of the pump chamber,

Figure 3 is a -vertical sectional view taken on line 3-4 in Figure l and showing further details of the pump structure.

Figure 4 is a fragmentary transverse sectional view taken on line i-4 in Figure 2 and showing further details of the pump embodying the present invention. v

Figure 5 is a fragmentary transverse sectional view taken on line 5-5 in Figure 2 and showing further details of the pump.

Figure 6 is a fragmentary plan view .showing the contour of the rotor and the cooperating blade on an enlarged scale.

Figure 7 is a transverse sectional view .taken substantially along line l! in Figure 8 and showing a modfied form of the rotary pump.

Figure 8 is a fragmentary vertical sectional View taken substantially along line 8-8 in Fig- .ure 7 and showing further details of the same modification.

Figure 9 is a fragmentary side elevational view, in full scale, of a further improved rotary :lluid metering pump embodying the invention, partly in section to more clearly illustrate the structural features.

Figure 10 is a transverse sectional view taken substantially along line ill-l0 in Figure 9 and on double scale to show more accurately the relative size and disposition of the ports, blades, etc.

Figure 11 is a fragmentary transverse sectional view in full scale, taken in a central plane through the fluid inlet opening as illustrated in Figure 9, and showing the manner of effecting communication between the pump chamber and inlet opening.

Figure 12 is a fragmentary transverse sectional view in full scale, taken in a central plane through both outlet openings as illustrated in Figure 9 and showing the manner of effecting communication between the-pump chamber and both outlet openings. v

Figure 13 is a fragmentary end elevational view, at 5 times the normal scale, of the removable insert of Figure 9 and showing the contour of the-pump chamber bore, the shape and d'is position of the adjacent inlet and outlet ports, and the intermediate slots for the blades,

In the drawings I have illustrated an antiicing pump embodying the present invention, positively driven by means of an electric motor which is the customary manner for effecting rotation of the pumping means but the invention may be otherwise adapted as will be obvious to those skilled in the particular art.

The pump and driving means are shown in full scale in the accompanying drawings in order that its size and compactness may be visually appreciated but the size may be varied to meet whatever conditions are required. The pump comprises a housing I9, preferably a bronze casting or other similar material, which has a bore ll extending inwardly from one end thereof terminating in a transversely extending inner wall l2. The housing In is provided with a fluid inlet opening l3 and a pair of fluid outlet openings i4 and I5 respectively in communication with a pumping means to be later described.

A cover [6, likewise preferably a bronze casting or other suitable material, normally closes the open end of the housing and has a laterally extending marginal flange I1 engageable with the adjacent face of the housing and removably connected thereto by a plurality of bolts IS. A gasket I9 is disposed between the adjacent faces of the housing and flange to provide a fluid tight seal. The cover l6 has an annular extension 20 projecting inwardly in the bore and the inner face of the annular extension is in abutting eng agement with the adjacent portion of the inner wall l2 thus providing an enclosed pump chamber 2| as more clearly shown in Figure 3.

A rotor 22, of tool steel or similar material, is rotatably disposed concentrically within the pump chamber 2| and has its opposite ends in running engagement with the adjacent walls of the housing and cover. The peripheral surface of the rotor 22 is of non-circular shape and preferably in the form of a three lobe cam with elevations 23 rotatably engageable with the inner peripheral wall of the pump chamber as more clearly shown in Figs. 2 and 6, the fluid completing an adequate seal. The depressions 24 are positioned diametrically opposite to the elevations '23, and thus, as shown, as the radius of elevation 23 comes to its maximum, the radius of depression .24 opposite comes to its minimum compensatively, and theoverall diametral measurement is uniformly the same at all diameters passing through the axis of rotation of the rotor, or otherwise stated, the diameter is a constant throughout. The rotor thus provides three non-communicating fluid chambers 26 between the elevations 23.

A blade assembly comprising a unitary assembly of two blades integrally joined to each other in the form of a member 21, of tool steel or similar material, is relatively long and thin having laterally extending ends 23 spaced relatively in substantially parallel relation the inner adjacent faces being at 29 for running engagement at diametrically opposite sides of the peripheral surface of the rotor 22 whereby the blade 21 is reciprocated. As the diameter of the rotor is uniform throughout, the rotor makes a running fit with the blade in all positions. The blade member 21 is slidably but nonrotatably mounted in a correspondingly shaped groove '20 formed in the adjacent portion of the cover 16 and the ends 28 are slidably disposed in slots 3| formed in the adjacent annular flange 20 between inlet and outlet openings, as more clearly shown in Figure 2.

Communication is afiorded between the fluid outlet opening [4 and the pump chamber 2| by an opening 32 provided in the adjacent flange 2K0 on one side of the blade 30, and between the fluid outlet opening l and the pump chamber by an opening 33 provided in-the adjacent flange 21) but diametrically opposite and on the opposite side of the blade as more clearly shown in Figure 2.

To establish communication between the fluid inlet opening l3 and the pump chamber 2!, openings 34 and 35 are provided in the flange 20 on diametrically opposite sides and each opening is disposed on the opposite side of the blade 30 from its adjacent outlet opening 32 and 33 respectively as more clearly shown in Figure 2. Due to the fact that only one fluid inlet opening I3 is desired the openings 34 and 35 should be suitably connected and, in the present instance, an annular groove 36 is formed on the peripheral wall of the bore ll, encircling the annular extension 20, and in common communication with the openings 34 and 35 and the fluid inlet opening l3 as more clearly shown in Figures 2, 3, 4 and 6.

It should be here pointed out that if two fluid inlet openings are desired the annular groove 36 should be eliminated and the openings 34 and 35 each connected directly with the different fluid inlet openings similar to the one indicated by the numeral l3. On the other hand should one fluid inlet opening and one fluid outlet opening be desired an additional annular groove similar to the one indicated by the numeral 36, should be provided it being located on the peripheral wall of the bore ll, but spaced inwardly from the groove 36. The additional groove should be in common communication with the

openings

32 and 33 affording communication with a single fluid outlet opening or one of the outlet openings M or 15 should be plugged.

In operation, referring particularly to Figure 2, as the rotor 22 rotates in the direction of the arrow, fluid is drawn in through the inlet opening 13, flows around the groove 35, and through the openings 34 and 35 respectively, the fluid being drawn successively into the non-communicating fluid chambers 26. As the fluid chambers change their respective positions, the fluid is discharged through the

outlet openings

32 and 33 depending upon which of the fluid chambers is in communication with the outlet openings and as the fluid chambers pass the inlet openings 34 and 35 additional fluid is drawn thereinto and the operation continues so long as the pump operates, During rotation of the rotor 22 the blade 30 is reciprocated, back and forth, by reason of the non-circular shape of the rotor and the ends 28 cooperate with the rotor in such a manner as to prevent any flow of fluid between adjacent outlet and inletopenings. Due to the fact that the outlets are of identical relative displacement and by reason of their displacements being governed by the same cam and same clearances, the discharged fluid from each outlet is of equal proportion provided they have the same resistance or are at the same pressure.

Any suitable means may be provided for effecting rotation of the rotor '22 but a simple and eflicient manner is illustrated in the drawings referring particularly to Figure 3. The rotor 22 has an outwardly extending axially disposed stub shaft 31 rotatably mounted in an opening 38 provided in the adjacent portion of the housing In, the latter having an extension 39 provided with an inwardly extending bore 48 in coaxial relation with respect to the stub shaft 31. The outer end of the stub shaft 31 has a non-circular reduced end 4| adapted to fit within a similarly shaped opening in a sleeve coupling 42. A fluid seal bearing member comprises cooperating

annular sections

43 and 44 encircling the shaft 31 and fitting within the bore 40, the lower portion 43 being seated upon the bottom of the bore while the upper portion 44 is disposed axially inspaced relation thereto. A- flexible annular shaped packing member 45 is disposed between

sections

43 and 44 to eflect a fluid seal about the rotatable shaft. A coiled spring 46 is disposed within the bore 40 and encircles the sleeve 42, the lower end of the spring resting upon the upper section 44 and adapted to exert a pressure suflicient to :maintain the seal. A washer 41 is disposed at the upper end of the springand is maintained in proper position by a snap ring 48 which fits in an annular groove formed on the inner pe- "ripheral wall of the extension 39.

In the present case, the .rotor 22 is driven by means of an electric motor 49 adapted to be mounted on the air-plane on a suitable supporting structure and connected in an electrical circuit in any well knowrrmanner. The circuit should include a rheostat for controlling the speed of the electric motor so. that the speed or the rotor may be likewise, controlled. The electric motor 49 is connected through a gear reduction mechanism 50 the details of which need not be shown or explained as any gear reduction may be used depending upon the relative speeds desired between the electric motor and the pump rotor. Th gear reduction mechanism 50 has an outwardly extendingstub shaft M, of non-circular shape, adapted to fit within a similarly shaped opening in the outer end of the sleeve coupling .42. It will be apparent from this construction that the rotor will be rotated at the desired speed which may be controlled within-limits by suitable operation of the rheostat. This is quite important where-the pump is to be used as an anti icing pump for slinger rings and, the like onpropellers inasmuch as the quantity of anti-icing fluid required may be as little as one-half gallon per hour and might be as much as two gallons per hour. Under. certain conditions, it would alsov be possible to connect the rotor shaft 31 directly with the electric motor where the speed of the latter can be controlled for eifecting rotationtof the pump rotor for supplying the small quantity of fluid required. The pump-housing id may be suitably mounted on the electric motor housing by means of a bracket 51 removably connected to both and this bracket preferably has openings :52 adapting the same for securement on any suitable supporting. structure. 1

The pump structure will operate very efficiently forhigh speeds as well as fairly :high pressures,

dueto the fact that the-only reciprocating part of the pump is its light blade. The pump, may also be used for oil and-fuel throughout the airplane where simple structures are desired. It may also be used as a hydraulic motordue to the-balanced condition of the rotor and thefact that the inlets and outlets-are. diametrically opposite each other'thus taking most of the load off ofthe bearing, and may thus do away with cramping condiv tions so common inhydraulic motors of the r-otar-y desi n.

In Figures 7 and 8 a modified form of the blade assembly is shown to assure proper running engagement between the opposite ends of the blades andthe adjacent face of the rotor in-the event inner adjacent wall of the bore l l in the housing. The extension 53 is'slotted at diametrically opposite sides, as shown in Figure 7, to receivea blade assembly comprising a pair of blades 55 adapted for'reciprocating movement transversely, the inner faces of the blades being engageable with adjacent portions of the rotor, and to join the blades and effect contact between the blades and rotor an arcuately shaped spring 56 is disposed in :encircling relation with respect to the extension '53 and has its opposite ends securely connected to the outer ends of the adjacent blades in such a manner as to afford unitary movement. If the cam face is laid out correctly, i. e. with its overall cliametral measurement uniformly the same at all diameters passing through the axis of rotation of the rotor, there will be no variationin engagement of the blades against the wall of the pump chamber, and the spring 56 will oscillate together with the blades 56 as a unit and the spring will not flex. Therefore, the force with which the blades engage the rotor is effected byv desirably pre-loading the spring 55. If there-should be an error in the cam face of the rotor, the springwill flex only in the amount of error tomaintain the blades in proper engagement with the cam face. The positions of the ports are :not shown in these views due to the fact that they bear the same relationshipwith respect to the blades .aswthcse shown in Figure 2, a detailed description of which has been hereinbefore'set forth.

In Figures 9 to 13 inclusive, a further improved rotary fluid metering pump is illustrated which forms the subject matter of this continuing application. This pump structure comprises a housing 58, of aluminum or similar material,.having a circular bore 6! extending inwardly from one end thereof which communicates with an axial opening 62 of relatively smaller diameter. The outer end of the housing is provided with an outwardly projecting marginal flange 63 to which a cover member fi4i5 removably connected by a plurality of machine screws 65 or other suitable means, for normally closing the adjacent end of the bore. The cover member 64 is formed with a single fluid inlet opening 66 interiorly threaded which extends inwardly from its outer end and a pair of substantially identical fluid outlet open: ings .61 and 5E 'interiorly threaded which extend inwardly from its outer end, as more clearly shown in Figures 11 and 12. v

A removable insert .63, of bronze or similar material, has a circular portion 10 snugly fitting within the bore 6! in the housing and an integral stem H of relatively smaller diameter disposed in the communicating opening .62, the free end of the stem ill being formed with a seat face H. The circular portion it has a pump chamber bore 12 extending inwardly from its outer end which; communicates'with an opening id of relatively smaller diameter extending centrally through the stem .1 i. A rotor '54, of steel or similar material, is rotatably disposed concentrically within the pump chamber bore 12 and has its opposite faces in running enl gagement with the adjacent walls ofthe insert 69 and a bushing iii, of bronze or similar material, mounted on the cover member 64 respectively. Th peripheral wall of the rotor '14 is preferably, in the form of longitudinally extending elevations vor ridges 16 substantially equally spaced apart relativelyin angular relation of degrees and in.- tervening-depressions ll of small but substantially equal volumetric capacity, the ridges being rotatably engageable with the inner peripheral wall ol? .t r m ham b as me ee arl'reeq i in Fig. 13, the fluid completing an adequate seal. The depressions H are positioned diametrically opposite to the elevations or ridges l6, and thus, as shown, as the radius of elevation 15 comes to its maximum, the radius of depression 11 oppo- Site comes to its minimum compensatively, and the overall diametral measurement is uniformly the same at all diameters passing through the axis of rotation of the rotor, or otherwise stated, the diameter is a constant throughout. The rotor thus provides three non-communicating fluid chambers 18 of small but substantially equal vo1- umetric capacities. The blade assembly here comprises a pair of relatively thin steel blades 19 slidably but non-rotatably mounted in transversely aligned slots 80 formed on the outer end of the circular portion and with their inner ends engageable at diametrically opposite sides of the peripheral wall of the rotor for effecting reciprocation of the blades 19, the blades also being adapted to divide the pump chamber into separate non-communicating portions, and to join the blades and effect contact between the inner ends of the blades 19 and the rotor cam face, a looped resilient spring member 8] is disposed for free oscillatory movement in a marginal groove 82 formed at the outer end of and on the outer peripheral wall of the circular portion 19 and has portions removably disposed in recesses 83 provided in the outer adjacent ends of the blades in such a manner as to afford unitary movement. If the cam face is formed correctly the spring member 8| will oscillate together with the blades 19 as a unit and, i. e., with its overall diametral measurement uniformly the same at all diameters passing through the axis of rotation of the rotor, there will be no variation in engagement of the blades against the wall of the pump chamber, and the spring member will not flex. Therefore, the force with which the blades engage the rotor cam face is effected by desirably preloading the spring member 8| for the same purpose as explained with reference to the modification of Figures 7 and 8.

To establish suitable communication between the single fluid inlet opening and both of the pump chamber portions, the improved arrangement comprises a pair of inlet ports 84 and 85 for the different pump chamber portions, arranged diametrically opposite and disposed relatively close to its adjacent blade. These inlet ports 84 and 85, preferably of substantially the same size, are formed on the inner peripheral wall of the pump chamber bore and extend parallel on opposite sides of the axis thereof, throughout the depth of the bore, the inlet ports in cross section being of arcuate form slightly greater than a semicircle as more clearly shown in Figures 10 and 13. At the inner end of the circular portion 69, a groove 86 of substantially uniform section, is formed onthe outer peripheral wall of the former and is in spaced relation with respect to the groove 6

I. Inlet passageways

81 and 88 of uniform diameter, are formed in the circular portion 69 and extend inwardly on diametrically opposite sides from the peripheral groove 86, the inner ends of the passageways communicating respectively'with the inner ends of the adjacent inlet ports 84 and 85 to afiord communication with the different pump chamber portions. An inlet passageway 89 is formed in the flange 63 and has its inner end communicating with the peripheral groove 86 while its outer end communicates with the single fluid inlet opening 66 whereby the incoming fluid'isdivided and introduced into both pump chamber portions successivelyas the rotor rotates.

To effect suitable communication between the pair of

fluid outlet openings

61 and 68 and both of the pump chamber portions, a pair of outlet ports and 9-! for the different pump chamber portions, are arranged diametrically opposite and disposed relatively close to its adjacent blade, the adjacent ports in each pump chamber portion being relatively spaced a distance greater than the spacing between adjacent ridges to insure against direct communication. These outlet ports 90 and SI, preferably of substantially thesame size, are formed on the inner peripheral wall of the pump chamber bore 12 and extend parallel on opposite sides of the axis thereof, throughout the depth of the bore, the outlet ports in cross section being of arcuate form slightly greater than a semicircle as more clearly shown in Figures 10 and 13. The bushing '15 is formed with a pair of identical outlet passageways 92 and 93- so positioned relatively that their inner ends communicate with the outer adjacent ends of the outlet ports 90 and BI while their outer ends communicate with adjacent but different fluid outlet openings 61 and 58 thereby affording discharge of the fluid under pressure from both pump chamber portions successively in substantially equal volumes upon rotation of the rotor. To prevent any trapping of the fluid discharged the outlet ports 90 and 9| are slotted at 92' in the direction of the adjacent blade thus providing sufliciently for the escape of fluid which might otherwise, affect the efliciency of the pump.

To effect rotation of the rotor 14, the latter is provided with an integral stub shaft 93 of reduced diameter which projects axially inward being rotatably but removably mounted in the central opening 13 of the stem H. The housing 60 is further, provided with a bore 94 which extends outwardly from its inner end, the bottom of the bore terminating adjacent the seal face H and communicating with the opening 62. The free end of the shaft 93 projects into the bore 94 and has a metal seal cage 95 freely mounted for relative angular movement thereon, the cage being formed with a seal face 95 engageable with the seal face H on the stem H to afford a fluid seal. A seal ring 96, of neoprene or similar material, is secured against displacement on the inner periphery of the cage and securely engages the adjacent portion of the shaft in encircling relation to afford a shaft seal. A coil spring 91 encircles the shaft and has one end in abutment with the cage to exert sufficient force for maintaining the cooperating seal faces in sealing engagement. The extreme free end of the shaft 93 is flattened at 98 to adapt it for removable connection with a coupling 99 likewise, removably connected to the end of an electric motor shaft, not shown, the electric motor indicated by the numeral I00, being suitably connected in an electrical circuit for operating the same. The motor should be of the variable speed type and its speed controlled preferably, by a rheostat to obtain the best operating conditions for the metering pump.

One of the important features of the improved metering pump, shown in Figures 9 to 13 inclusive, is the ease with which the individual elements can be machined and assembled without decreasing its efllciency. The removable insert 69 is assembled unitarily by placing the rotor in the bore, the blades in the slots, and the preloading ring disposed in the marginal groove with portions in the adjacent recesses of the blades. This insert, thus assembled, can be removed from 9 and replaced in the housing bore 6| by merely removing the cover member 64 in the event of injury or damage which is a simple manner of repair. The form and arrangement of the inlet and outlet ports is, likewise, important in the simplification of production and efficiency in operation.

In the operation of the further improvement, referring particularly to Figure 10, as the rotor H rotates in the direction of the arrow, fluid, by reason of the vacuum created, is drawn in through the single inlet opening 66, flows around the communicating peripheral groove 86 on the insert, through the communicating

passageways

81, and 88 on diametrically opposite sides, and into both pump chamber portions through related communicating inlet ports 84 and 85, the fluid being drawn successively into the non-communicating fluid chambers 18. In as much as the fluid chambers 1-8 serve to transmit the fluid under pressure toeach outlet port 90 and 9| respectively, the

volume of fluid discharged is substantially equal because despite any errors in the rotor cam face this defect will be present in both outlets but will haveno' detrimental efiect on the operation of the pump. As the fluid is discharged through the respective outlet ports 90 and 9! it flows through the related communicating

passageways

92 and 93 and from them to the related communicating

outlet openings

61 and 68 in substantially equal volumes where the fluid is conveyed bysuitable conduits, not shown, to the slinger rings or simi laninstrumentalities to be actuated thereby.

While I' have described the preferred embodiment of the invention it is to be understood that I am: not to be limited thereto inasmuch as changes and. modifications may be resorted to without departing from the spirit of the invention as defined in the appended claims.

What is claimed is:

1'. A rotary fluid metering pump comprising; a housing. having a pump chamber therein, a fluid inlet. opening,v and a pair of fluid outlet openings;

a rotor rotatably disposed in said pump chamber and: having a non-circular peripheral wall in the form. of alternate ridges and depressions so psitioned relatively to each other that the same dimension prevails between all diametrically opposite points on said peripheral wall when passing through the axis of rotation of said rotor, said ridges being rotatably engageable with the inner peripheral wall of said pump chamber and the intervening depressions being of substantially equal volumetric capacities; and a blade assembly slidablybut non-rotatably mounted in said housing and having its opposite ends engageable with diametrically opposite sides of the peripheral wall of said rotor for effecting reciprocation of said blade, the opposite ends of said blade dividing said pump chamber into separate non-communicating portions; said pump being provided with a passageway affording communication between said fluid inlet opening. and both of said pump chamber portions; said pump-containing a pair of noncommunicating passageways each of which affords? communication between different pump chamber portions and difierent fluid outlet openings ofsaid pair, whereby, upon rotation of said rotor, fluid is drawninto the alternate depressions successively in both pump chamber portions fronrsaid fluidrinlet opening and" discharged under pressure in substantially equal volumes-from the different fluid outlet openings.

A rotary fluid metering pump comprising; a housing having a pump chamber therein, a

mean? fluid inlet opening, and a, pair ofv fluid outlet" openings; a rotor rotatabl'y' disposed in said punip chamber and having a non-circular peripheral wall in the form of a three l'obecani, the'lobe's" of said cam being equally spacedapart about the axis of the rotor and rotata'bly engage'abl'e with the inner peripheral wall of said pump chamber, the surfaces of said jcam intervening between the lobes being spaced from" said pe iphi opposite" ends of said blade dividing said chamber into separate non-communicating portions; said pump being provided wth a assage:

way affording communication between said fluid inlet opening; and both of said pump chamber portions; said pump containing a pair of non communicating passageways each of which af-' fords communication between. different pump chamber portions and different fluid outlet o en: ings of saidpair, whereby, upon' rotation of saidrotor, fluid is drawn into the intervening spaces successively in both pump chamber portions from said fluid inlet opening and discharged under pressure in substantially equal volumes from the different fluid outlet openings;

A rotary fluid metering" pump comprising,;. a housing having a bore extending inwardly fro'm' one ndthereor; said housing having aslhgl fluid inlet opening-and a; pair of fluid outlet open ing's'; a cover member at the open end of said housing for normally closing the same and removably' connected to the latter, said cover member having' anannular extension projecting into said bore to provide with the bottom of the bore an enclosed pump chamber; a; rotor rotatabl'y disposed in said ump chamber and having. a" non-circular peripheral wall in the form of alter nate ridges and depressions so positioned relatively to each other that the same dimension prevails between all diametrically opposite points,

on said peripheral" wall when passing through.

the axis of rotation of said rotor, said ridges being rotatably engageable with the inner peripheral wall of said annular extension and the intervening depressions" being of substantially equal volumetric capacities; a blade slidably but non-rotatably mounted in said cover member and having its opposite ends engageable with diametrically opposite sides of the peripheral wall of said rotor for effecting reciprocation of said blade the' opposite ends of said blade dividing said pump chamber into separate noncommunicating portions; acontinuous groove formed on the inner peripheral. wall of said housing bore and normally closed on its inner side by said annular extension; a pair of substantially identical inlet ports in said annular extension, disposed relatively to each other in diametrically opposite relation on opposite sides of and in close proximity to the respective ends ofsa'id' blade to aflord communication betweensaid groove and different pump chamber portions; an inlet passageway in said housing af for'ding communication between said single inlet opening and said groove; a pair of substantension, disposed relatively to each other in .dia-' metrically opposite relation on opposite sides of and in close proximity to the respective ends of said blade to afford communication with different pump chamber portions, the adjacent ports in each pump chamber portion being spaced apart relatively to each other a greater distance than the angular spacing of the ridges on said rotor; and outlet passageways of substantially identical size in said housing each of which afiords communication between different outlet ports and a related outlet opening, whereby, upon rotation of: said rotor, fluid is drawn into the alternate depressions successively in both pump chamber portions from said single inlet opening and discharged under pressure in substan-. tially equal volumes from the different fluid out: let openings. 7

4. A rotary fluid metering pump comprising; a'housing having a, pump chamber therein, a fluid inlet opening, and a pair of fluid outlet openings; a, rotor rotatably disposed in said pump chamber and having non-circular peripheral wall in the form of alternate ridges and depressions so positioned relatively to each other that the same dimension prevails between all diametrically opposite points on said peripheral wall when passing through the axis of rotation of said rotor, said ridges being rotatably engageable with the inner peripheral wall of said pump chamber; and .a pair, of blades slidably but non-rotatably mounted in said housing and engageable at diametrically opposite sides of the peripheral wall of said rotor for, eflecting reciprocation of said blades, said blades dividing said pump chamber into separate non-communicating portions; a looped resilient pre-loaded member connected to said blades for efiecting unitary movement without flexing but adapted to maintain engagement between said blades and cam face to compensate for slight errors in the latter with minimum flexure; said housing being provided with a passageway affording communication between said fluid inlet'opening and both of said pump between different pump chamber portions and different fluid outlet openings of said pair, whereby, upon rotation of said rotor, fluid is drawn successively into both pump chamber portions from said fluid inlet opening and discharged under pressure in substantially equal volumes from the different fluid outlet openings.

5. A rotary fluid metering pump comprising; a housing having a bore extending inwardly from one end thereof, said housing having a fluid inlet opening and a pair of fluid outlet openings; a cover member at the open end of said housing for normally closing the same and removably connected to the latter, said cover member having an annular extensionprojecting into said bore to provide with the bottom of the bore an enclosed pump chamber; a rotor rotatably disposed in said pump chamber and having a non-circular peripheral wall inthe'form of alternate ridges and depressions so positioned relatively to each other that the same dimension prevails between all diametrically opposite points on said peripheral wall when passing through the axis of rotation of said rotor, said ridges being rotatably engageable with the inner peripheral wall of said extension; a pair of blades slidably but non-rotatably mounted in said cover member and engageable 12 with diametrically opposite sides of the peripheral wall of said rotor for effecting reciprocation of said blades, said blades dividing said pump chamber into separate non-communicating portions; a looped resilient pre-loaded member connected to said blades for effecting unitary movement without flexing but adapted to maintain engagement between said blades and cam face to compensate for slight errors in the latter with minimum flexure; a continuous groove formed on the inner peripheral wall of said housing bore and normally closed on its inner side by said annular extension; a pair of inlet ports in said annular extension disposed relatively to each other in diametrically opposite relation on opposite sides of and in close roximity to the ends of said blades to afford communication between said groove and different pump chamber portions; an inlet passageway in said housing affording communication between said single inlet opening and said groove; a pair of outlet ports in said annular extension, disposed relatively to each other in diametrically opposite relation on opposite sides of and in close proximity to the respective ends of said blades to afiord communication housing each of which affords communication be-.

cent ports in each pump chamber portion being spaced apart relatively to each other a greater distance than the angular spacing of the ridges on said rotor; and outlet passageways in said tween different outlet ports and a related outlet opening, whereby, upon rotation of said rotor;

fluid is drawn into the alternate depressions successively in both pump chamber portions from said single inlet opening and discharged under pressure in substantially equal volumes from the different fluid outlet openings.

6. A rotary fluid metering pump comprising; a housing having a bore extending inwardly from one end thereof and a single fluid inlet opening and a pair of fluid outlet openings; a cover member at the open end of said housing and removably connected to the latter, said cover member having an inwardly projecting annular extension snugly fitting the wall of the bore to provide with the bottom of the bore an enclosed pump chamber; a rotor rotatably disposed in said pump chamber and having a non-circular peripheral wall in the form of alternate ridges and depressions so positioned relatively to each other that the same dimension prevails between all diametrically opposite points on said peripheral wall when passing through the axis of rotation of said rotor, said ridges being rotatably engageable with the inner peripheral wall of said extension and the alternate depressions being of substantially equal volumetric capacities, said rotor being further provided with an axially disposed driving shaft rotatably mounted in said housing; a long thin blade slidably but non-rotatably mounted in a pair of outlet ports in said annular extension,

13' disposed relatively to each other in. diametrically opposite relation on opposite sides. of and/in, close proximity tothe respective ends of said; blade: to afford communication with diffierent plump cham-- ber' portions, the adjacent ports in each pump chamber portion being spaced apart relatively toeach other a greater distance than-the angular spacing of the ridges 'on said rotor; and outlet passageways in said housing. each of which affords communication between different outlet portsand a relatedoutlet opening, whereby, upon rotation of said rotor, fluid is drawn into the intervening' depressions successively in bothpu-mp chamber portions from said single outlet opening and discharged under pressure in substantially equal volumes from the difierent fluid outlet openings.

7.. A rotary fluid metering pump comprising; a housing having a bore extending inwardly fronione end thereof, and a fluid inlet open-- ing. and a pair offluid outlet openings; acover member at the open end of said housing and-- removably connected to the: latter, said cover member having an inwardly projecting annular extension snugly fitting the wall or the bore to provide with the bottom of the bore an enclosed pump chamber; a rotor rota-tabl-y disposedin saidchamber. and having a non-circular peripheral wallin the form of alternate. ridges and de-" press-ions so. positioned relatively vthat the same dimension prevails between all: diametrically op posite. points on said peripheral wall when passing through the axis. of rotation of saidroto'r, said ridges being rotatably engageable with the inner peripheral wall: of said extension and the intervening depressions being of substantially equal volumetric capacities; said rotor beingiurther provided with an axially disposedidriving shaft rotatably'mounted: in said: housing; a long;v thin blade slidably but nonx-rotatabl'y mounted-- in. said cover member and: having laterally extending opposite ends projecting into said? chamer, said-ends being engageablla with diametri cally opposite sides of: the peripheratwal l' of said rotor-.for effectingreciprocationv off said blade and dividing said pump; chamber into separate non-communication portions; said. housing being further provided with a. continuous groove-formed on the peripheral wall of the bore and a con-- necting passageway affording communication be-- tween said groove and said. fluid inlet opening; said annular: extension being provided with: trans verse inlet ports on: diametrically opposite sides afiording communication between saidgroove" and both pump chamber portions; a pair of outlet ports, in said annular extension; disposed rel atively to each other in diametricallyoppositepassageways in. said housing each of which affords communication between difterent outlet ports. and a related outlet openingwhereby; upon rotation of said rotor, fluid is drawn into the:

alternate depressions successively in bothlpump;

chamber portions from said. single inlet opening and discharged under pressure in. substantiallyequal volumes from the different fluid; outlet openings.

8. A rotary fluid metering, pump comprising;

a. housing having a bore extending inwardly from one. endthereof, and a. fluidinlet opening, anda assent? pair ofi luid outlet openings; a cover "member.

atthe open end of said'housing andremovably' connected tothe latter, said cover member having an inwardly projecting annular extension snumy fitting the wall of the bore to provide with the: bottom of the'bore an. enclosed pump chami-j bar; a rotor rotatably disposed in said pump chamber and having a non-circular peripheral; wall in the form of alternate ridges and d:epressions so positioned relatively that the same (Ii men-slop prevails between all diametrically oppo site points on said peripheral wall when passing: through; the axis of rotation of saidrotor, said ridges'be-ing rotatably engageable with the inner i peripheral wall of said extension and the alter-- nate depressions being of substantially equal vol-- umetric' capacities, said rotor being further provided with an axially disposed driving sha-ft ro"- tatably mounted in-said housing at the opposite sidefrom said cover; a blade slidably bu-t nomrotatably mounted in said cover member and having its opposite ends engag'eable diemetrically opposite sides of the peripheral wall of: said rotor for-effecting reciprocation of said blade; the opposite ends of said blade dividing said pump chamber into separate non-coinmunieatingv portions; a continuous groove formed" on the: inner peripheral wall of said housing bore and normally closed on its inner side" by said annuiar extension; a pair of inlet ports in said annular extension, disposed rel-ati-vely to each other in diametrically opposite relation "on oppo site sides of and inclos'e proximity to the respec tive ends-of said blade toafford co'mmumcation" between'said groove and different pump chamber" portions an inlet passageway in said housing affording communication between said single inlet opening said-groove; a pairof outlet ports i'rr' said annular extension, disposedrelatively' to each other diametrically opposite relation on opposite sides of and in close proximity to the respective ends or said blade to afford communi: cationdifferent pump chamber portions, the: adjacent ports in eachpump chamber por tion being spaced apart relatively to each other" a greater distance than the angular spacing of charged underpressure in substantially equal volumes from the difierent fluid outlet openings; and power means o-peratively connected to. the

outer" end of said shaft for imparting rotation thereto;

9. Arotary fluid metering pump comprising; a"

housing having a circular" bore extending inwardly. from" one end thereof, an opening of rela tively smaller diameter than said bore disposed in axial alignmentwith said bore and communieating therewithya cover member at the boreend of said housing for normally closing the bore and removably connected to said housing, said cover member having a single fluid inlet openinganda:

pair of fluid outlet openings; bearing material; in-

cluding a circular portion fitting snugly in said" I bore. and havin a stem integral therewith, said stem being of smaller diameter than said circular portion and disposed in said communicating openings, said circular portion having a pump chamber bore: extending axially inwardfrom its-outer end; an:- opening of relatively smaller diameter than said pump chamber bore extending centrally through said stem and communicating with said pump chamber bore; a rotor rotatably disposed in said pump chamber bore and having an axially projecting stub shaft integral therewith and of relatively smaller diameter rotatably mounted in the opening in said stem, the free end of said shaft being adapted for driving connection with a power means, the peripheral wall of said rotor being in the form of ridges extending longitudinally thereof and substantially equally spaced apart relatively in angular relation and intervening depressions of small but substantially equal volumetric capacity, the ridges being rotatably engageable with the inner peripheral wall of said pump chamber bore; slots transversely aligned with each other on the cover end of said circular portion, a pair of thin blades slidably but non-rotatablymounted in said slots and having their inner ends engageable with diametrically opposite sides of the peripheral wall of said rotor for effecting reciprocation of said blades and dividing said pump chamber into separate non-communicating portions; a marginal groove formed at the cover end of and on the outer peripheral wall of said circular portion, a looped resilient pre-loaded member disposed for free movement in said marginal groove, said looped member being operatively connected to the outer ends of said blades for effecting unitary movement of said blades without fiexure of said member but adapted to maintain engagement between said blades and rotor peripheral wall to compensate for slight error of contour in the latter with minimum flexure; a pair of substantially identical inlet ports in said circular portion disposed relatively to each other in diametrically opposite relation on opposite sides of and in close proximity to the respective blades to afford communication with diflerent pump chamber portions; a peripheral groove of substantially uniform section formed at the inner end of said circular portion; a pair of substantially identical inlet passageways diametrically disposed with respect to each other in said circular portion having their inner ends communicating respectively with the adjacent inlet port and their outer ends in common communication with said peripheral groove; an inlet passageway in said housing having its inner end communicating with said peripheral groove and its outer end communicating with the inlet opening on said cover member; a pair of substantially identical outlet ports in said circular portion disposed relatively to each other in diametrically opposite relation on opposite sides of and in close proximity to the respective blades to afford communication with different pump chamber portions, the adjacent ports in each pump chamber portion being spaced apart relatively to each other a greater distance than the angular spacing of the ridges on said rotor; and substantially identical outlet passageways in said pump, each of which has its inner end communicating with different but adjacent outlet ports and its outer end communicating with difierent but adjacent outlet openings in said cover member, whereby, upon rotation of said rotor, fluid is drawn into the intervening depressions successively in both pump chamber portions from the single fluid inlet opening and discharged under pressure in substantially equal volumes from the difierent fluid outlet openings.

7 10. A rotary fluid metering pump comprising; a housing having a bore extending inwardly from one end thereof a cover member atthe. bore end 16 of saidhousing fornormally closing the bore and removably connected to said housing, said cover member having a single fluid inlet opening and a pair of fluid outlet openings; bearing material, including a' circular portion snugly fitting within said housing bore and having a pump chamber bore extending axially inward from its outer end;' a rotor rotatably disposed concentrically in said pump chamber bore and having an axially projecting shaft rotatably mounted in said housing; the peripheral wall of said rotor being in the form of ridges extending longitudinally thereof and substantially equally spaced apart relatively in angular relation and intervening depressions of smallbut substantially equal volumetric capacity, the ridges bein rotatably engageable with the inner peripheral wall of said pump chamber bore; slots transversely aligned with each other on the cover end of said circular portion, a pair of thin blades slidably but nonrotatably mounted in said slots and havin their inner ends engageable with diametrically opposite sides of the peripheral wall of said rotor for effecting reciprocation of said blades and dividing said pump chamber into separate non-communicating portions; a marginal groove formed at the cover end of and on the outer peripheral wall of said circular portion, a looped resilient pre-loaded member disposed for free movement in said marginal groove, said looped member being operatively connected to the outer ends of said blades for effecting unitary movement of said blade without fiexure of said member but adapted to maintain engagement between said blades and rotor pheriph'eral wall to compensate for slight error of contour in the latter with minimum flexure; a pair of substantially identical inlet ports of arcuate shape in cross section disposed relatively to each other in diametrically opposite relation and formed on the inner peripheral wall of and extending for the depth of said pump chamber bore, the inlet ports being positioned on opposite sides of and in close proximity to the respective blades to afford communication with different pump chamber portions; a peripheral groove of substantially uniform section formed at the inner end of said circular portion, a. pair of substantially identical inlet passageways in said insert having their inner ends communicating respectively with the adjacent inlet inner peripheral wall of and extending for the depth of said pump chamber bore, the outlet ports being positioned on opposite sides of and in close proximity to the respective blades to afiord communication with different pump chamber portions, the adjacent ports in each pump chamber portion being spaced apart relatively to each other a greater distance than the angular spacing of the ridges on said rotor; and substantially identical outlet passageways in said pump, each of which has its inner end communicating with different but adjacent outlet ports and its outer end communicating with different but adjacent outlet openings in said cover member, whereby, upon rotation of said rotor, fluid is drawn into the intervening depressions successively in both 17 pump chamber portions from said single fluid inlet opening and discharged under pressure in substantially equal volumes from the different fluid outlet openings.

11. A rotary fluid metering pump comprising: a-housing having a pump chamber therein, a single fluid inlet opening, and a pair of fluid outlet openings; a rotor rotatably disposed in said pump chamber and havin a non-circular peripheral wall in the form of a three-lobe cam, the peaks of the cam being equally spaced apart about the axis of said rotor and rotatably engageable with the inner peripheral wall of said pump chamber, the depressions intervening between said peaks being of substantially equal volumetric capacities, the peaks and depressions bein so positioned relatively to each other that the same dimension prevails between alldiametrically opposite points on said peripheral wall when passing through the axis of rotation of said rotor, said rotor having an axially projecting stub shaft of relatively smaller diameter than said rotor rotatabl-y mounted in said housing, the inner face of said rotor and bottom of said pump chamber being engageable with each other to provide a fluid tight seal effected by fluid pressure, the free end or said shaft being adapted for driving connection with a power means; slots transversely aligned with each other in. said housing adjacent said pump chamber, a pair of thin blades slidably but non-rotatably mounted in said slots and havmg their inner ends engageable with diametrically opposite sides of the peripheral wall" of said rotor for efiecting reciprocation of said blades and dividing said pump chamber into separate non-communicating portions; resilient pre-loaded means; operatively connected to the outer ends of said blades for exerting a yieldable pressure to maintain; engagement between said blades and rotor peripheral wall regardless of error of contour in the latter; a pair of inlet ports in said housing disposed relatively to each other in diametrically opposite relation on opposite sides of and in close proximity to the respective blades to afford. communication with differa en-t pump chamber portions; a continuous groove formed said housing, a pairof inlet passageways in said housing having their inner ends communicating respectively with the adjacent inlet port and their outer ends in. common communication with said continuous groove; an inlet passageway in said housing having its inner end communicating with said groove and its outer endv communicating with said single inlet openings; a pair of outlet ports in said housing disposed relatively to each other in diametrically opposite relation on opposite sides of and in close proximity to the respective blades to aiford communication with different pump chamber portions; the adjacent ports in each pump chamber portion being spaced apart relatively to each other a greater distance than the angular spacing. of the ridges on said rotor; and outlet passageways in said housing, each of which has its inner end communicating with difierent but adjacent. outlet. ports and the outer end communieating with d-ifierent but adjacent outlet openings of the pair in said housing whereby, upon rotation of said rotor, fluid from said single inlet opening, is drawn into the intervening depressions successively into each pump chamber portion and discharged under pressure in substantially equal volumes from the different outlet openings.

12. A. rotary fluid metering pump comprising: a housing having a bore therein, a single fluid in 18 let opening, and a pair of fluid outlet openings; a removable insert snugly fitting within said housing bore and having a pump chamber bore eX- tending axially inward from one end of said insert; a rotor rotatably disposed in said pump chamber bore and having a non-circular peripheral wall in the form of a three-lobe cam, the peaks of the cam being equally spaced apart about the axis of said rotor and rotatably errgageable with the inner peripheral Wall of said pump chamber bore, the depressions intervening between said peaks being of substantially equal volumetric capacities; the peaks and depressions being so positioned relatively to each other that the same dimension prevails between all diametrically opposite points on said peripheral wall when passing through the axis of rotation of said rotor; said rotor having an axially projecting stub shaft rotatably mounted in said housing, the free end of said shaft being adapted for driving connection with a power means; slots transversely aligned. with each other in said insert adjacent said pump chamber bore, a pair of thin blades slidably but non-rotatably mounted in said slots and having their inner ends engageable with diametrically opposite sides of the pe-- ripheral wall of said .rotor for effecting reciprocation of said blades and dividing said pump chamber bore into separate non-communicating portions; resilient pro-loaded means operatively connected to the outer ends of said blades for ex-- erting a yieldable pressure to maintain engagement between said blades and rotor peripheral wall. regardless of error of contour'in the latter; a pair of inlet ports in said insert disposed relatively to each other in diametrically opposite relation on opposite sides'of and in close proximity to. said blades to afford communication with different pump chamber portions; a continuous groove formed in said insert, a pair of inlet passageways in said insert having their inner ends communicatingrespectively with the adjacent inlet port and their outer ends in common communication with said continuous groove; an inlet passageway in said. housing having its inner end communicating with said groove and its outer end communicating with said single inlet opening; a pair of outlet ports in said insert disposed relatively to each other in diametrically opposite relation on opposite sides of and in close proximity to said blades'to afford communication with,

difierent pump chamber portions; the adjacent ports in each pump chamber portion being spaced apart relatively to each other a greater distance than the angular spacing of the ridges on said tion and discharged under pressure in substantially equal volumes from the different outlet openings.

13;, A rotary fluid metering pump comprising:- a housing having a bore therein, a single fluid" inlet opening, anda pair of fluid outlet openings; a removable insert snugly fitted Within sai'dhou'sing bore and having a pump chamber bore extending axially inward from one end of said in-- sort; a rotor rotatably disposed in said pump chamber bore and having a, non-circular periph--' 19 eral wall i'n the form of a three-lobe cam, the peaks of the cam being equally spaced apart about the axis of "said rotor and rotatably engageable with the inner peripheral wall of said pump chamber bore, the depressions intervening between said peaks being of substantially equal vo-lumetric capacities; the peaks and depressions being so positioned relatively to each other that the same dimension prevails between all diametrically opposite points on "said peripheral wall when passing through the axis of rotation of said rotor; said rotor having ah axially projecting stub shaft rotatably mounted in said housing, the free end of said shaft being adapted for driving connection with a power means; slots transversely aligned with each other in said insert adjacent said pump chamber bore, a pair of thin blades slidably but non-rotatably mounted in said slots and having their inner ends engageable with diametrically opposite sides of the peripheral wall of said rotor for effecting reciprocation of said blades and dividing said pump chamber bore into separate non-communicating portions; a marginal groove formed at the outer end of said insort, a looped resilient pre-loaded member disposed for free movement in said marginal groove, saidlooped member being operatively connected to the outer ends of said blades for exerting a yieldable pressure to maintain engagement between said blades and rotor peripheral wall when error of contour exists in the latter; a pair of inlet ports in said insert disposed relatively to each other in diametrically opposite relation on opposite sides of and in close proximity to the respective blades to afiord communication with different pump chamber portions; a continuous groove formed in said insert, a pair of inlet passageways in said insert having their inner ends communicating respectively with the adjacent inlet port and their-outer ends in common communication withvsaid continuous groove; an inlet passageway in said housing having its inner end communicating with said groove and its outer end communicating with said single inlet opening; a pair of outlet ports in said insert disposed relativelyv to each other in diametrically opposite relation on opposite sides of and in close proximity to the respective blades to afford communication with, different pump chamber portions; the adjacent ports in each pump chamber portion being spaced apart relatively a greater distance than the angular spacing of the ridges on said rotor; and outlet passageways in said pump, each of which has its inner end communicating with different but adjacent outlet ports and the outer end communicating with different but adjacent outlet openings of the pair in said housing whereby, upon rotation of said rotor, fluid from said single inlet opening, is drawn into the intervening depressions successively into each pump chamber portion and discharged under pressure in substantially equal volumes from the different outlet openings.

14. A rotary fluid metering pump comprising: a housing having a pump chamber bore extending inwardly from one end thereof; a cover member at the bore end of said housing for normally closing the bore and removably connected to said housing, said cover member having a single fluid inlet opening and a pair of fluid outlet openings; a rotor rotatably disposed in said pump chamber bore and having a non-circular peripheral wall in the form of a three-lobe cam, the peaks of the cam being equally spaced apart about the axis of said rotor and rotatably engageable with 20' the inner peripheral wall of said pump chamber bore, the depressions intervening between said peaks being of substantially equal volumetric capacities; the peaks and depressions being so p0- sitioned relatively that the same dimension prevails between all diametrically opposite points on said peripheral Wall when passing through the axis of rotation of said rotor, said rotor having an axially projecting stub shaft of relatively smaller diameter than said rotor rotatably mounted in said housing, the inner face of said rotor and bottom of said pump chamber bore being engageable with each other to provide a fluid tight seal effected by fluid pressure, the free end of said shaft being adapted for driving connection with a power means; slots transversely aligned with each other in said housing adjacent said pump chamber bore, a pair of thin blades slidably but non-rotatably mounted in said slots and having their inner ends engageable with diametrically opposite sides of the peripheral wall of said rotor for effecting reciprocation of said blades and dividing said pump chamber bore into sepa-' rate non-communicating portions; resilient preloaded means operatively connected to the outer ends of said blades for exerting a yieldable pressure to maintain engagement between said blades and rotor peripheral wall regardless of error in the latter; a pair of inlet ports in said housing disposed relatively to each other in diametrically opposite relation on opposite sides of and in close proximity to said blades to afford communication with difierent pump chamber portions; a continuous groove formed in said pump, a pair of inlet passageways in said pump having their inner ends communicating respectively with the adjacent inlet port and their outer ends in common communication with said continuous groove; an inlet passageway in said housing having its inner end communicating with said groove and its outer end communicating with said single inlet opening; a pair of outlet ports in said pump disposed relatively to each other in diametrically opposite relation on opposite sides of and in close proximity to said blades to afford communication with diiferent pump chamber portions; the adjacent ports in each pump chamber portion being spaced apart relatively to each other a greater distance than the angular spacing of the ridges on said rotor; and outlet passageways in said pump, each of which has its inner end communicating with different but adjacent outlet ports and the outer end communicating with difierent' but adjacent outlet openings of the pair in said cover member, whereby, upon rotation of said rotor, fluid from said single inlet opening, is drawn into the intervening depressions successively into each pump chamber portion and discharged under pressure in substantially equal volumes from the difierent outlet openings.

15. A rotary fluid metering pump comprising: a housing having a bore extending inwardly from one end thereof; a cover member at the bore end of said housing for normally closing the bore and removably connected to said housing, said cover member having a single fluid inlet opening and a pair of fluid outlet openings; a removable insert snugly fitting within said housing bore and havin a pump chamber bore extending axially inward from one end of said insert; a rotor rotatably disposed in said pump chamber bore and having a non-circular peripheral wall in the form of a three-lobe cam, the peaks of the cam being equally spaced apart about the axis of said rotor and rotatably engageable with the inner peripheral wall of said pump chamber bore, the depressions intervening between said peaks being of substantially equal volumetric capacities; the peaks and depressions being so positioned relatively to each other that the same dimension prevails between all diametrically opposite points on said peripheral wall when passing through the axis of rotation of said rotor; said rotor having an axially projecting stub shaft rotatably mounted in said housing, thevfree end of said shaft being adapted for driving connection with a power means; slots trans versely aligned with each other in said insert adjacent said pump chamber bore, a pair of thin blades slidably but non-rotatably mounted in said slots and having their inner ends engageable with diametrically opposite sides of the peripheral wall of said rotor for effecting reciprocation of said blades and dividing said pump chamber bore into separate non-communicating portions; resilient pre-loadied means operatively connected to the outer ends of said blades for exerting a yieldable pressure to maintain engagement between said blades and rotor peripheral wall regardless of error of contour in the latter; a pair of inlet ports in said insert disposed relatively to each other in diametrically opposite relationon opposite sides of and in close proximity to the respective blades to afiord communication with d-ifierentpump chamber portions; a continuous groove formed in said insert, a pair of inlet passageways insaid insert having their inner ends communicating respectively with the adjacent inlet and their outer ends in" common communication with said continuous groove; an inlet passageway in said housing having its inner end communicating with said groove and its outer end communicating with said single inlet opening; a pair of outlet ports insaid insert disposed relatively to each other in diametrically opposite relation on opposite sides of and in close proximity to the respective blades to afford communication with different pump chamber portions; the adjacent ports in each pump chamber portion being spaced apart relatively a greater distance than the angular spacing of the ridges on said rotor; and outlet passageways, each of which has its inner end communicating with diff erentbut adjacent outlet ports and the outer ends of said passageways communicating with different but adjacent outlet openings of the pair in said cover member, whereby, upon rotation of said rotor, fluid from said single inlet opening, is drawn into the intervening depressions successively into each pump chamber portion and discharged under pressure in substantially equal volumes from the diiierent outlet openings.

16. A rotary fluid metering pump comprising: a housing having a bore extending inwardly from one end thereof; a cover member at the bore end of said housing for normally closing the bore and removably connected to said housing, said cover member having a single fluid inlet opening and a pair of fluid outlet openings; a removable insert snugly fitting within said housing bore and having a pump chamber bore extending axially inward from one end of said insert; a rotor rotatably disposed in said pump chamber bore and having a non-circular peripheral wall in the form of a three-lobe cam, the peaks of the cam being equally spaced apart about the axis of said rotor and rotatably engageable with the inner peripheral wall of said pump chamber bore, the depressions intervening between said peaks being of substantially equal volumetric capacities; the peaks and depressions being so positioned relatively to each other that the same dimension prevails between all diametrically opposite points on said peripheral wall whenpassing through the axis ot rotation of said rotor; said rotor having an axially projecting stub shaft rotatably mounted in said housing, the free end of said shaft being adapted for driving connection with a power means a fluid seal about said shaft and mounted in said housing a pair of thin blades slidably but nonrotatably mounted in transversely aligned slots in said insert adjacent said pump chamber bore and having their inner ends engageable at diametrically opposite sides ofthe peripheral wall of said rotor for effecting reciprocation of said blades anddividing said pump chamber bore into separatenoncommunicating portions; resilient pro-loadedmeans operatively connected to the outer ends of said blades for exerting a yieldable pressure to maintain engagement between said blades and rotor peripheral wall regardless of error of contour in the latter; a pair of inlet ports in said insert disposed relatively to each other in diametri-. cally opposite relation on opposite sides of and in close proximity to the respective blades toaff or'd communication with different pump chamber portions; a continuous groove formed insaid insert, a pair of inlet passageways in said insert having their inner ends communicating respectively with the adjacent inlet port and their outer ends in common communication with said continuous groove; an inlet passageway in said locusing having its inner end communicating with said groove and its outer end communicating with said single inlet openings; a pair of outlet ports in said insert disposed relatively to each other in diametricall-y opposite relation on opposite sides or and in close proximity to the respective blades to at ford communication with different pump chamber portions the adjacent ports ineach pump cham her portion being: spaced apart relatively to each other a greater distance than the angular spacing of the ridges on said rotor; and outlet passageways in said pump, each of which has its inner end communicating with different but adjacent outlet ports and the outer end communicating with difierent but adjacent outlet openings of the pair in said cover member, whereby, upon rotation of said rotor, fluid from said single inlet opening, is drawn into the intervening depressions successively into each pump chamber portion and discharged under pressure in substantially equal volumes from the different outlet openings.

17. A rotary fluid metering pump comprising: a housing having a bore extending inwardly from one end thereof; a cover member at the bore end of said housing for normally closing the bore and removably connected to said housing, said cover member having a single fluid inlet opening and a pair of fluid outlet openings; a removable insert snugly fitting within said housing bore and having a pump chamber \bore extending axially inward from one end of said insert; a bushing member mounted in said cover member and disposed in abutting relation with respect to the adjacent end of said insert for normally closing the outer end of said pump chamber bore; a rotor rotatably disposed in said pump chamber bore and. having a non-circular peripheral wall in the form of a three-lobe c'am, the peaks of the cam being equally spaced apart about the axis of said rotor and rotatably engageable with the inner peripheral wall of said pump chamber bore, the depressions intervening between said peaks being of substantially equal volumetric capacities; the peaks and depressions being so positioned relatively to each other that the same dimension pres vails between all diametrically opposite points on said peripheral wall when passing through the axis of rotation of said rotor; said rotor having an axially projecting stub shaft rotatably mounted in said housing, the free end of said shaft being adapted for driving connection with a power means; transversely aligned slots in said insert adjacent said pump chamber bore, a pair of blades slidably but non-rotatively mounted therein and having their inner ends engageable with diametrically opposite sides of the v peripheral wall of said rotor for effecting reciprocation of said blades and dividing said pump chamber bore into separate non-communicating portions; resilient pre-loaded means operatively connected to the outer ends of said blades for exerting a yieldable pressure to maintain engagement between said blades and rotor peripheral wall regardless of error of contour in the latter; a pair of inlet ports in said insert disposed relatively to each other in diametrically opposite relation on opposite sides of and in close proximity to the respective blades to afford communication with difi'erent pump chamber portions; a continuous groove formed in'said insert; a pair of inlet passageways in said insert having their inner ends communicating respectively with the adjacent inlet port and their outer ends in common communication with said groove; an inlet passage'way in said housing having its inner end communicating with said groove and its outer end communicating with said single inlet opening; apair of outlet ports in said insert disposed relatively to each other in diametrically opposite relation on opposite sides of and in close proximity to the respective blades to afford communication with different pump chamber portions; the adjacent ports in each pump chamber portion beingspaced apart relatively to each other a greater distance than the angular spacing of the ridges on said rotor; and outlet passageways in said bushing and cover members, each of which has its inner end communicating with difierent but adjacent outlet ports and its outer end communicating with different but adjacent outlet openings of the pair in said cover member, whereby, upon rotation of said rotor, fluid from said single inlet opening, is drawn into the intervening depressions successively into each pump chamber portion and discharged under pressure in substantially equal volumes from the difierent outlet openings.

- JAMES P. JOHNSON.

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

UNITED STATES PATENTS Number Name Date 607,678 'Brainerd July 19, 1898 763,525 Van Beresteyn June 28, 1904 791,919 Leid June 6, 1905 934,968 Harman Sept. 21, 1909 1,054,729 i/vhittinghill et al. Mar. 4, 1913 1,607,180 Storv Nov. 16, 1926 1,938,869 Shimerda Dec. 12, 1933 1,996,620 Ketterer Apr. 2, 1935 2,036,543 Ross Apr. 7, 1936 2,073,101 Fox Mar. 9, 1937 2,191,172 Lisowski Feb. 20, 1940 2,204,073 Dodge June 11, 1940 FOREIGN PATENTS Number Country Date 203,978 Great Britain Sept. 20, 1923 383,538 Great Britain Nov. 17, 1932 401,243 Germany Aug. 29, 1924