US1888250A - Electromagnetic fuel pump - Google Patents

Description

Nov. 22, 1932. P. s. TICE ELECTROMAGNETIC FUEL PUMP Filed Feb. 13, 1928 6 Sheets-Sheet 1 Nov. 22, 1932. C 1,888,250

ELECTROMAGNETIC FUEL PUMP Filed Feb. 13. 1928 6 Sheets-Sheet 2 was: @MW

Nov. 22, 1932. P. s. TlCE ELECTROMAGNETIC FUEL PUMP 6 Sheets-Sheet Filed Feb. 13, 1928 6/ VIE/m \v Nov. 22, 1932. CE 1,888,250

ELECTROMAGNETIC FUEL PUMP Filed Feb. 13. 1928 6 Sheets-Sheet 4 Nov. 22, 1932. P. s. TlCE ELECTROMAGNETIC FUEL PUMP Filed Feb. 13, 1928 6 Sheets-Sheet 5 ,zvflezr/i'az". fercbflai 13.22 '09 Nov. 22, 1932. P. s. TlCE ELECTROMAGNETIC FUEL PUMP Filed Feb. 15, 1928 6 Sheets-Sheet 6' 172%? 71%02. ferazflaZ 5120a Wzesa @lifim 83 84/7 5%02226 z 5..

Patented Nov. 22, 1932 UNITED STATES PATENT OFFICE PERQIVAL S. TICE, OF CHICAGO, ILLINOIS, .ASSIGNOR T STEWART-WARNER COBPOBIL- TION, OF CHICAGO, ILLINOIS, A CORPORATION OF VIRGINIA ELECTROMAGNETIC FUEL PUMP Application filed February 13, 1928. Serial No. 253,974.

The purpose of this invention is to provide an improved construction for feeding fuel from low level source to the carburetor of an internal combustion engine, the same comprising an electromagnetic pumping device. It consists in the elements and features of construction shown and described as indicated in the claims,

In the drawings Figure l is a diagrammatic view showing one form of installation of the invention.

Figure 2 is a similar view showing a second form of such installation.

Figure 3 is a similar View showing a third andin general preferred form of installation and construction.

Figure 4 is a vertical section axial with respect to the cylinder of a form of electromagnetic pumping device embodying the invention designed and adapted to be installed submerged in the main tank from which the fuel is to be pumped for supplying the carbureter,

Figure 5 is a section at the line 55 on Figure 4.

Figurefi is a section at the line 66 on Figure 4:.

Figure 7 is a detail section at the line 7--7 on Figure 4.,

Figure 8 is a section at the line 8-8 on Figure 1.

Figure 9 is a section at the line 99 on Figure 1.

Figure 10 is a section axial with respect to the venturi of the fuel intake passage of the engine and with respect to the pumping device, of a structure embodying the invention as in the installation shown in Figure 3 in which the electromagnetic pumping device and the governor are both embodied in the unitary carbureter structure.

Figure 11 is a section at the line 11-11 on Figure 10.

Figure 1:2 is a section at the line 1212 on Figure 10.

Figure-13 is a wiring diagram of the form shown in Figures 10, 11 and 12.

Figure 14 is a detail section at the line 14-44 on Figure 9.

Figure 15 is a section at the line 1515 on Figure 14-.

Figure 16 is a view corresponding to Figure 4 showing a modification of the pumping device adapted to be installed submerged in the fuel tank.

Figure 17 is a top plan view of the construction shown in Figure 16 as at plane indicated by the line 1717, that is with the connection fitting detached,

Figure 18 is a section at the line 1818 on Figures 16 and 17.

of the middle portion of the construction shown in Figure 16.

Figure 20 is a section at the line 20-20 on Figure 18.

Figure 21 is a section at the line 21-21 on Figure 12 on an enlarged scale for showing the alternating switch.

Figure 22 is a section at the line 22-422 on Figure 11.

Figure 23 is a section at the line 23-23 on Figure 19.

Figure 24 is a view looking in the direction of the arrow, 24, on Figure 10 with the bottom detachable parts removed.

The structure as illustrated in Figures 1 and 4 will first be described.

In this embodiment of the invention the carbureter of the engine to be served is seen at A; the main fuel tank usually carried at the rear of the vehicle to be served is seen at B; the pumping device in its entirety is indicated at C, where it is seen submerged in the fuel in the tank, B, and connected by a pipe, 10, leading out pf the top of the tank with a pipe, 11, for conducting the fuel to a local fuel container, 12, of small capacity, mounted in proximity to the engine as at the front of the dash and under the cowl, and connected by the pipe, 13, for delivering the fuel by gravity to the carburetor.

In this installation the governing device indicated in its entirety on Figure 1 by reference letter, D, is mounted on the container, 12, hereinafter more particularly identified as consisting of a casing, 90, having chainhers, 91 and 98, for containing a limited quantity of fuel pumped thereto.

Figure 19 is a detail inverted plan view hating attraction.

The construction of the pumping device will first be described in detail. It is of the general character of an electromagnetic pump in which the electromagnetic elements are of quasi solenoid type; that is, the llOD. core, 40, encompassed by the circuit windings, ll, 41, is hollow, and the armature element, 42, is adapted to telescope with the hollow core which has its ends fitted with pole pieces, 43, re, between which the armature element, 42, has a short range of reciprocation in the tubular core, lO, which serves also as a pump barrel or cylinder in which the armature element, l2, operates as a piston, being suitably provided with packing rings as indicated at is. The pole pieces, 43, as, are each apertured as seen at 43 for flow of the fuel pumped into and out of the cavities, do, 45, by the armature acting as a piston and reciprocating the short distance shown of the excess of length of the interval between the pole pieces and the length of the armature piston Guided in the pole pieces is an axially positioned rod, l6, on which the armature piston is mounted, and about this axial guide, as it may be called, ol' the armature piston, there are coiled springs, 47, 47, which are accommodated at the opposite ends in axial recesses, 22*, 42 in the piston armature, said springs reacting between the bottoms of these recesses and the pole pieces respectively, tending to position the armature piston equidistantly between the two pole pieces, and so tending return it to this position when the pole piece which has attracted it in one direction, compressing the spring at side, is die-energized by the interruption of the current through the circuit winding at that endof the magnet. The tubular core member, 40, is adapted for retaining the circuit windings by having titted securely on it midway in its length an iron annular disk, 4-8, forming a spool head between the two winds; similar iron spool heads, 48, 428*, are securely on the opposite outer ends of the pole pieces, d3,

The entire electromagnet assembly as thus described is encompassed by a sleeve, l9, which is titted snugly to the spool heads, 48,

\ e8 48 and at the right hand end (referring to Figure 4) there is secured an insulating disk, 50, upon which is mounted a snap over switch member, 51, hereinafter more particularly described, which is operated by the thrust of the rod, 46, upon the movement of the armature piston under the alternating attraction of the opposite pole pieces for sitting the current back and forth between the two circuit windings to cause said alterlhe assembly encompassed and made securely unitary by the sleeve, 49, is enclosed in a casing, 60, in which it is fitted so as to partition the main cavity of the casing from the cavities, 45, 4:5, from which the pipe, it), leads for conducting the detail in its relation to the nessnso fuel on its way to the carbureters above described. I

llt may be understood that the entire pump structure as seen in Figure i: being submerged in the main tank, derives fuel supply through a filter screen, 64, mounted on an annular bottom flange, 65, of the casing, 60, and enclosing an entrance chamber, 61, from which the fuel is drawn alternately into the cavities, lf), $25, by the alternating strokes of the piston member, 42, the fuel entering past check valves, 67, 67, and being discharged from the cavities, 3:5, to, respectively, past check valves, 68 and 69, (see Fig. 5) into the passage, 62, formed in a boss, 66, at the upper side 01' the casing, 60, from which passage, 62, the pipe, 10, leads to the carbureter,

"lhe snap switch will now be described in parts of the circuit which it connects. conductor, 70, leads from the engine ignition switch, not shown, through the governing switch, D, hereinafter described, and into and through the pipe, 10, into the chamber, 62, and therein to a bindingpost, 71, mounted in the partition wall, 69, at the inner side of which in the chamber, 15, said binding post is in con tact with the resilient tongue, 72, of a bracket, 73, which is mounted on the insulating disk, 50. 'lo this bracket the snap lever, 51, is pivoted at its upper end, said snap lever being forked at the lower end for carrying at that end a roller, 74, one end of which obtains its journal bearing in an elongated slot, 75, in one of the fork arms, 76, its journal bearing at the other end in the other fork arm being loose to permit the first mentioned end to play in the slot without cramping the hearing at the opposite end; and a stretched spring, 77, connects the first mentioned end of the roller with the pivot of the lever at its upper end to the bracket as mentioned. The rod, t6, carries a conoidal cam collar, 78, formed tapering from the maximum diameter midway of its length, narrowing toward both ends. This cam collar is mounted on the rod, 46, at such position that midway in the stroke of the piston, 42, said cam collar stands with the plane of its maxi mum diameter containing the axis of the pivot of the lever, 51; and the length of said lever from its pivot at the upper end to the mounting of the roller, 74 at its lower end is such that the spring, 77, operates to hold the roller stressed upwardly against the cam collar. Upon considering this construction it will be understood that when the rod carrying the double cone is thrust by the armature piston from one extreme position to the other, in passing the midway position it will force the roller against the resistance of the stretched spring outward from the axis of the cone, and upon the reaction of the spring pulling it back against slope of the cone the lever will be swung in the opposite direction from the thrust of the rod. On the insulating disk, 50, there are mounted so as to project at opposite sides of the lever, 51, spring contacts, 80, and 81, which are connected respectively by circuit Wires, 82 and 83, with the outer coils of the windings, 41 and 41, said windings have their innermost coils grounded by their connection to the core.

It will be seen from this construction that the, thrust of the armature piston upon its attraction by one of the magnet pole pieces upon the energizing of that pole piece by the current through its winding will cause the operation of the snap switch to shift the current to the other winding, energizing the opposite pole piece which will thereupon retract the armature piston, again reversing the connection, and thus the reciprocation of the armature piston will continue, the pumping actionwill continue, pumpingthe fuel, until by any means or from any cause either the resistance of the fuel to the pumping action exceeds the pumping capacity of the device, or the energizing circuit is int-errnpted otherwise than in the alternating manner described which causesthe reciprocation. The intent of the structure being to maintain the pumping action in such manner as to maintain the supply of fuel to the carburetor and to interrupt the pumping action when the supply exceeds the carburetor requirements in the least degree, provision is made for Interrupting the circuit by the action of the fuel pumped when the supply passes the predetermined limit of the requirement of the carbureter. This interruption of the circuit is effected by the governing device which will now be described.

The governing device includes the casing, 90, of the container, 12, and particularly the chamber, 91, therein, the outer side wall of which comprises a flexible diaphragm, 92, stressed inwardly by an exterior spring, 93, reacting at its outer end against a spider or bridge member, 90 mounted exteriorly on the casing. Binding posts, 96 and 96, set in the casing and extending into the chamber, 91, at opposite points in its periphery, serve respectively for positioning in the chamber, 91, a rigid contact, 94:, and the spring contact, 95, whose terminal buttons, 94*- and 95, are normally in contact, the spring contact being connected by a spacer, 97, with the center of the diaphragm, 92, so that the reaction of the spring, 93, tends to enforce the contact of the buttons, 94 and 95. The casing has a chamber, 98, extending up alongside the chamber, 91, to a height determined upon for adapting said chamber, 98, to act as a stand pipe for liquid communicating with the chamber, 91, for exerting pressure on the diaphragm to expand said chamber, 91, and cause the diaphragm to withdraw the spacer, 9?, from the spring contact, 95, and

permit the latter to react for separating the buttons, 9? and 95*, or if the spacer is attached to the spring contact, as it may be, to withdraw the spring contact with the spacer and separate the buttons, breaking the circuit. The casing, 90, as to both its chambers, 91 and 98, is in communication through the pipe, 11, with the discharge of the pumping device, said pipe being connected at the side of the casing, 90, through a nipple, 99, lead ing to a hollow boss, 99, which opens downwardly at the center of the circular base, 90", of the casing, 90, which is peripherally flanged as seen at 90, and shouldered as seen at 90 for seating on and closing the upper end of a sediment cup, 90, between which and the casing there is clamped a strainer, 90, and a gasket, 90, the strainer being clamped at the end of the central boss, 99 by a T- fitting 11 screwed into the boss and constituting the continuation of the entrance passage for liquid which is thus introduced below the strainer and passes up through the latter into the chamber, 98, and. thence by ports, 99, in the partition,*99'-', into the chamber, 91.

In the installation illustrated in Figure 2 the sediment cup is omitted and the governor is mounted directly on the stand pipe chamher-designated 98 in this forn1,at the lower end thereof as indicated by the spider, 9 1, and the spring, 923, seen in Figure 2, and the said stand pipe chamber, 98', is made of suitable capacity and suitably positioned with respect to the carburetor fuel nozzle indicated at 100 to function as the customary carbureter float bowl for supplying the nozzle under governed hydrostatic pressure, the stand pipe level of said chamber being the governed level of the customary float bowl, the fuel being delivered from this chamber to the fuel nozzle of the carburcter under the same conditions as it is delivered from the customary float bowl to the fuel nozzle.

0f the installation seen diagrammatically in Figure 3 the detail construction may be understood from Figures 10, ll, 12, 22, 23 I and 24e, as will 'now be described.

In this embodiment of the invention the electromagnetic pumping element comprises an energizing circuit winding, 200, wound between iron retaining rings or spool heads, 201, 202, upon a hollow core member, 203, whose cavity from one end to a point somewhat past the middle of the length constitutes a piston chamber, 20%, in which there is fitted piston-wise an armature element, 205, the remaining portion of said cavity, which is somewhat less than half the axial extent of the encompassing circuit winding, which is occupied by a fixed magnet pole piece, 200, to which the armature piston, 205, is attracted when the circuit is closed through the circuit winding, 200. A spring, 205 ,is provided reacting on the armature piston for restoring it to normal position, withdrawn from the 207, there is mounted pole piece, 206, when the circuit is interrupted by the action of the switch to be now described.

At the end of the core member opposite the pole piece, 206, there is mounted a segmental annular insulating plate, 207, which serves to stop the outward-spring-caused stroke of the armature piston. On said insulating plate,

a switch lever, 20S, pivoted at one end as seen at 209 in Figure 12 on a bracket, 210, mounted fixedly on'said insulating plate, 207, and in contact with a binding post, 210, to which is attached the circuit Wire, 211, which leads from the ignition switch seen at M in Figure 3. Said switch lever extends across the axis of the core member and carries at its free end a roller, 212, which at rest position of the parts, when no current is net circuit winding, and the armature piston is accordingly thrust by the spring, 203, against the inner side of the insulating plate, 207, rests against the inner side of double cone boss, 213, of insulating material having a hollow stem, 21%, by means of which it is mounted centrally in the armature piston, 205, and co-operates with the pin, 20%, which projects rigidly from the pole piece, 206, into said hollow stem for guiding the armature piston from which said double cone boss projects past the insulating plate, 207. At this position of the switch lever it is in contact with the contact member, 215, to which is attached the circuit wire forming circuit winding, 200, whose inner end is grounded through the governing switch as hereinafter described; and in this position of the switch it closes the circuit through said circuit windings for energizing the magnet pole piece. The roller, 212, is journaled in the ends of the two parallel arms, 208 208", of the switch lever, 208, and has one of its journal bearings slotted to permit the roller journaled at its end to vibrhte toward and from the doubleconed boss, 213, and a stretched spring, 216, connected to that end of the roller journal and at the other end to the bracket, 210, operates for holding the roller stressed against the double cone with the ellect that when the armature piston is pulled inward by the attraction or" the pole piece upon the closing of the circuit through the ignition switch by the governing switch ashereinafter described, energizing the circuit winding, 200, the roller being crowded out to the apex of the double cone, is retracted on the outer cone slope and the switch lever, 208, is thus swung over to circuit-breaking position where it is stopped by a projection, 217, on the bracket, 210. 'lhereupon the spring, 205*, retracts the armature piston to the initial position causing opposite action of the cooperating double cone and roller, i. e., swinging-the switch lever back to the circuit-closing position; and thus the armature piston is reciprocated rapidly passing through the mag-4 spider serving also for having a pin,

so long as the circuit is closed through the governing switch and interrupted only by the alternating switch above described.

The electromagnetic pumping device thus far described is fitted snugly in a cylindrical cavity of the casing, 220, with one open end of which the pumping device is flush, the cavity of the casing being counter-bored the length over-all of the pumping device, leavin at the inner end of the cylindrical cavity a chamber, 221, in which the alternating switch device above described is situated. The casing, 220, has an exteriorly projecting hollow boss, 222, extending the entire height of the casing at the side at which the chamber, 221, is situated and extending also around the lower right-hand corner and along the side of the casing as seen at 223, and open at the end at which the pumping device is flush with the casing as above mentioned. At the upper side the casing has a hollow boss, 224,0pen at the same end as the boss, 222. A port, 225, affords communication of the chamber, 221, with the boss, 222, at the upper end of the latter, and below that port there is interposed in the boss, 222, a check valve, 226, open for liquid flow toward the port, 225, and thereby into the chamber, 221; and from the upper side of that chamber a port, 227, controlled by a check valve, 228, ah"ording communication with the cavity of the boss,22 l, the valve, 228, opening for how the boss cavity and seating against reverse flow.

In this installation the governing switch element comprises the diaphragm, 230, mounted in position for closing the lower end of the fuel receiving cavity of the carburetor, comprising the standpipe or level overning chamber, 98 said diaphragm bemg clamped into place between gaskets, 230

111, with the spring 231,

230*, by the spider,

the under side of the interposed between diaphragm, through the central hub of the spider, said clamping above the plate, 111, having a diaphragm a damping affording restricted central aperture, 111", access to the diaphragm of the fuel in the standpipe or level governing chamber. This damping plate carries an insulating binding post, 232, onto the upper end of which there is secured one end of an upper contact memher, 233, and below which there is secured one end of a lower spring contact'member, 235, said contact members both extending into alignment with the axis of the dia-- phragm where they are provided with con-- tact buttons, 233 and 235, respectively, tacing each other,

the spring contact member 234,, projecting down through the aperture, 111 in the damping plate, 111 for engagement with the diaphragm, 230, at the center of the latter.

The circuit connection to the governing it and an adjusting screw acting assesso switch is made from the inner end of solenoid winding, 200, from which as seen in Figure 18 the circuit wire is led out, insulated as indicated at 200 through the spool head 201, to an insulated contact button, 201*. A spring circuit wire, 237, is mounted rigidly in a conductive sleeve, 236, which is mounted in the insulating post, 232, carried by the damping plate, 111*, the upper end of the sleeve being peened over upon the contact member, 233, for securing the latter on the post as above described. Said spring circuit wire extends up in the chamber, 08 and at its upper end is bent laterally as seen at 237*", :tor projecting into contact with the contact button, 201*; and for insuring some stress of the end of the spring circuit wire against said contact button, there is provided an insulating abutn'ient, 260, mounted in the wall of the chamber, 98 against which the upr1ght portion of the spring circuit wire, 23?, 1s thrust by the button, 201 in applying and mounting the casing 220, on the outside or the chamber, 98

From this description it will be understood the circuit is grounded through the damping plate, 111, on which the spring contact, 235, is mounted below the insulating post, 232, and that the circuit is" normally closed through the governing switch by the action of the spring, 231, stressing the diaphragm upward and holding the contact buttons, 233 235 in touch with each other; and that the circuit is broken when the hydraulic pressure of the fuel pumped into the chamber, 98 is sufiicient to overcome the spring and separate the contact buttons, 233 ,235

in all the forms shown in the several installations illustrated in Figures 1, 2 and 8, it is of great advantage to employ a corn struction which is illustrated in Figure 3 and which will now be described, for a purpose which will appear as the description proceeds.

At the lower end of the level-governing chamber, 98 which functions as a stand pipe for aliording hydrostatic head acting on the operating diaphragm of the governing switch in the constructions of Figures 10 and 11, there is formed a hollow boss, 110, whose cavity, 110 is a part of the cavity 01 the level-gmerning chamber, and which is made open at the bottom of said boss for admitting the parts to be described, the opening, after said parts are introduced, being closed by a tightly fitting stamped closure member, 111. The vertical axis of the cavity, 110, of the boss in Figure 10, is in the vertical plane oi the axis of the fuel inlet port through the nipple, 255, and the latter port is furnished with a check valve fitting, 256, in sorted and screwed in from the outer end of the nipple, 255, and comprising a checlr valve, 25?, opening for inflow and adapted to be adjusted to stop or restrict the inflow The inner end of the stem, 258, of the valve, 257., at what may be regarded as the normal or rest position of the parts, with the valve open for inflow or held open by inflow, bears against the upper end of the short arm, 259, of a weighted lever or pendulum, 260, which is pivoted at 261 and depends from its pivot toward the cavity, 110, or the boss, 110, having its lower end heavily weighted as seen at 262. The position of the parts seen in Figure with the weighted pendulum at its normal vertical position, is that which they will occupy when the vehicle whose engine is equipped with the device is traveling on the level road. When the vehicle is on descending grade, so that the fuel supply tank at the rear is elevated and may be so much elevated that the fuel will flow by gravity, without the service or the pump to the carburetor, and would eventually flood the carburetor, the movement of the pendulum from vertical position, operates to move the valve, toward closed position, and to close it and hold it closed when the grade is such as to elevate the fuel supply at the rear of the vehicle above the level the carburetor. The parts are dimensioned with relation to the usual distance of the fuel tanlr rearward from the carburetor so that the force exerted by the pendulum lever at the upper end of its short arm against the stem of the valve, 257, for holdin the latter closed corresponds with the head pressure operating horizontally of the liduicl due to the elevation of the rear tank so that as this head pressure increases the force exerted by the pendulum for holding the valve closed correspondingly increases. And that even it the vehicle should become tilted up at the rear to a vertical position,- standing on its :torward end,the pressure of the fuel in the tanlr would not open the valve against the resisting force exerted by the pendulum for holding it seated,

in Figures 16 to 20 there is shown a modification of the electromagnetic pumping device which has some advantages for installations such as shown in Figure 1, having the entire pumping device submerged in the main fuel tank. This modification comprises a casing consisting of a central member, 300, and lateral or end members, L 301, in the form oat caps which are adapted to be applied to the opposite sides of the central member with packing gaskets, 304, 1-, interposed,

tor

the three members being held rigidly together and the joints rendered liquid-tight by an encomp assing binder, 305. In this casing there is mounted the pumpingmechanism comprising two solenoids of which the core members, 303, 308, are fixed in the outer ends of the respective solenoid tubes, 302, 302, the arr a.- ture, 807, of the right hand solenoid being mounted rigidly upon a central stern, 308, one

end of which obtains slide bearing in the right hand core member, 303. The left hand solenoid has the armature, 307*, similarly mounted rigidly upon a stem, 309, which obtains slide hearing at the outer end in the lefthand core member, 303. The central casing member, 300, has an annular boss, 310, which affords the slide seat for the piston member, 311, fitted within said annular boss and together with said annular boss, and the transaxial web, 312, of the piston, 311, constituting a complete partition in the cavity of said central casing member, 300, dividing it into chambers, 313 and 314. In the chamber, 313, at the left-hand side of this partition there is mounted a switch structure identical with that shown in Figure 4 and having the several parts indicated by the'same' reference numerals and the stem, 309, of the left-hand solenoid carries a double cone boss, 320, which operates said switch in the manner already described. The chamber, 313, has at the lower side two ports, 315, 315, for inlet of iuel from the main tank in which the entire structure is submerged, said ports being controlled by the inwardly opening check valves, 316, 316; and said chamber has at the upper side outlet ports, 317, 317, for communication with a chamber, 325, in the upper part or the casing above the chambers, 313 and 314', said ports being controlled by check valves, 318, 318, opening for outflow, said cavity, 325, having connection at the upper side indicated by the nipple, 326, for attaching the pipe, 10, leading tothe elevated reserve chamber, 12, as shown and described with respect to the construction seen in Figures 1 and 4. The circuit connection from the ignition switch to the solenoid windings is made in substantially the same manner as the construction shown in Figure 4, the circuitwire being led through the pipe, 10, into the chamber, 325, where the wire is secured to binding 0st, 328, which is electrically connected by spring, 329, with the binding post, 330, at the inner end of which the switch-supporting bracket, 7 3, is secured substantially as described with respect to the construct-ion shown in Figure 4. At the normal position of rest with the circuit connection with the ignition switch interrupted, so that the solenoid windings are not energized, the piston, 311, occupies the position seen in Figure 16, and the stems, 308, 309, are held in contact with the piston web by springs, 331, 331, housed in the axial bores of the cores, 303, 303. at he opposite ends of the piston respectively, and the armatures, 307, 307 carried by the stems, 308 and 309 respectively stand each spaced inwardly from the proximate endsof the cores respective with which the armatures co-operate When the governing switch is closed, one or the other of the solenoids oeing energized according to the position of the alternating switch 51 at that instant, the correr finding aseaaeo armature is attracted to the core, causing the piston to be drawn to one limit of its stroke, which,assuming that to be to the righthand side of the partition,causes fuel. to be drawn in to the chamber, 314, at the left-hand side, and driven out from the chamber, 313, at the right-hand side of the partition. This action operating to reverse the alternating switch 51 in the manner already described with respect to the construction shown in Figure 4, causes the left-hand end solenoid to be energized and the right-hand solenoid to be (lo-energized, resulting in the stroke of the piston in the opposite direction, drawing in the fuel to the right-hand chamber and expelling it from the left-hand chamber, the operation being thus self-repeating and maintaining pumping action as of a doubleacting pump so long as the governing switch is closed, the operation being in all respects similar to that described with respect to the structure shown in Figure 4. For this action it will be understood that the armatures are apertured as seen at 340 for free 1 communication of the spaces between the armature and the core with the spaces in which the piston reciprocates for its pumping action.

The purpose served by the springs, 331, 331, reacting on the armature for returning them 'to the mid-position after each stroke caused by the energizing of either co-operating core member, is that-thereby the armature is positioned distant from the core whose winding is energized upon the operation of the alternating switch upon the last preceding stroke, only half as far as it would otherwise be, and the force of magnetic attraction varying inversely as the square of the distance of the armature from the attracting pole, this force for starting the armature and the pump piston is four times as great as it would have been if the armature were leftat the position to which it was drawn by the attraction of the last energized core; and the length of the spring being very short relatively to the length of the coil spring which is compressed in the stroke, the resistance of the spring which has to be overcome by the magnetic attraction whose energy is thus stored in the compressed spring, is not materially greater at the end than at the beginning of the spring-compressing stroke, and the two springs practically ofi'set each other throughout the very short stroke, each returning the armature and piston to midposition, the diet result is that the amount of electric energy necessary to operate the device for pumping at a given rate is reduced the magnetic element of the pump is energized; a stroke-controlling switch device "which is automatically operated oppositely hy the opposite pumping strokes for alternately making and breaking the circuit connections, the circuit containing also a governing switch device comprisinaua member exposed to the pressure of the liquid pumped, and connections from said member for operating said governino' switch to interrupt the circuit upon predetermined pressure of the pumped liquid on member, the fuel chamher of the carhul ter being connected With the discharge of he pump for fuel iioW from the pump toward the carburetor, the governingswitch-operating member being a port-ion of the Wall said fuel chamber and exposed to the head pressure of the liquid any time contained th rein.

2. In a construction for the purpose indicated in combination with the carburetor of an internal coinhustion engine, a magnetically operatec. pump; an electric circuit in which magnetic element of the pump is energized; a stroke controlling switch which is automatically operated oppositely hy the opposite pumping strokes for alternately making and breaking the circuit connections, the carloureter havii a standpipe chamber which in supplied with fuel by the pumping device, the circuit containing a governing switch (10-, viceu hich comprises a member exposed to the action of he liquid in the standpipe chamber, and connections from said mernhei for operating said governing switch to interrupt id in said standpipe the circuit noon the lion chamher reaching predetermined depth.

3. in a construction for the purpose indicated in combination with the carhureter of an internal combustion engine comprising a fuel chamhe' on which the fuel for runni lg the engine is talrcn directly by engine suction, a magnetically or eratcd pump; an eiectric circuit in which the magnetic element of pump is energized, stroke controlling switch device which is magnetically operated oppositely by opposite pumping strolres for alternately making and breaking the circuit connections, the pump in its entirety including its stroke control ling switch member heiugmounted adjacent to said fuel chamher the carburetor, the circuit containing a governing" switch device couzurising' nemher adapted to ha operated l the actio of the l quid con tamed in i Mi carburetor fuel chamber, said rovernii Witch device and its operating; member being also mounted adjacent to said carhureter fuel chamber, and said fuel chamher havi g port and duct for communicstiou of the liquid pressure contained therein to said operat p" nemher.

5 L n construction to; the purpose indicated, in comhination with the carburetor of on internal comcustion engine, and connecalternately making and breaking the circuit connections, the carburetor comprising a fuel chamber to which the fuel is supplied by the pumping device, the circuit containing a governing switch device comprising a member exposed to the action of the liquid at any time contained in the fuel chamber of the carburetor, the tuel conduit from so fuel source to the carhureter fuel chamher having a bore affording access of the liquid pressure in said conduit to said switch operating member, and connections from said member for operating said governing sui to interrupt the circuit upon the liquid sure in said conduit mined degree.

5, In the construction defined in claim l, the s 'itcl'i-operating memher being adapted so to react automatically for closing the circuit upon reduction the pressure thereon of the pumped liquid below the predetermined degree.

In combination with the carhureter of an internal combustion engine, ele mechanical "fuel pumping apparatus havi connection for flow from a t'uel so having a magnet energizing circuit, means to connected with the 3 source of circuit; a switch device ed for making hrealring such connec on, means operable the pressure of i pumped for operating the switch to the circuit'upon said pressure reaching redetermined degree; a chamher in the fuel pumped may accumulate to sale .erree, the fuel flow connection to the pu up ing apparatus hein made in cha whereby the pump energizing circuit i Le interrupted when the fuel level at the source is such as to produce the predetermined degree of pressure, independently o eration of the pump; a valve positio controlling the ilou of liquid ii source to the chamber arranged to again inflow, a pendulum lever ii? chamher having; a Weighted longer a m reaching a predeten a shot r arm which is encountered *alve at "he 1::

discharge connection leading to the engine intake manifold, a magnetically operated pump and a circuit in which the magnetic element of the pump is energized; a governing switch mounted in the fuel chamber and operable for interrupting the current in said circuit and thereby interrupting the pumping action; the fuel chamber having a movable wall member exposed to the pressure of the liquid in the said fuel discharge connection to the intake manifold operatively connected to the governing switch for giving the same its circuit opening. movement upon predetermined pressure in said conduit.

8. In a construction for the purpose indicated, afuelchambe-r mounted on the engine and having fuel discharge connection leading to the engine intake manifold; a magnetically operated pump connected for discharge within the fuel chamber and an electric circuit in which the magnetic element of the pump is energized, a governing switch mounted in the fuel chamber for interrupting .,the current to interrupt the pumping acportion of the tion, the fuel chamber having a movable wall member mounted for exposure to the pressure of the liquid content of said fuel chamber, and operating connections from said member for operating said governing switch arranged to interrupt the circuit upon the fuel reaching a predetermined depth in the fuel chamber. 9. The construction defined in claim 7 the governing-switch-operating member being a wall of the fuel chamber and exposed to the head pressure of the liquid at any time contained therein.

10. In combination with a chamber in which liquid is accumulated,pressure-producing means forso accumulating it: electro-magnetic means for controlling said pressure producing means; an electric circuit in which said electro-Ina-gnetic means is energized; a switch mounted in the fuel chamber controlling said circuit; the chamber having a movable wall member exposed to pressure of the liquid accumulated due to its being fed to a predetermined level, and connections from said member for operating said switch to interrupt the circuit when the liquid reaches said level.

11. In combinat on with a chamber in which liquid is to be accumulated, pressure producing means including a magnetically operated pump for so accumulating the liq -uid; an electric circuit in which the magnetic element of the pump is energized; a strokecontrolling switch which is automatically operated oppositely by the opposite pumping strokes for alternately making and breaking the circuit connections, the chamber having a standpipe extension which is supplied with fuel by the pumping device, the circuit con taining a governing switch device which comprises a movable member of the chamber wall inwardly exposed to the action of the liquid'in the standpipe extension, and connections from saidmovable wall member for operating said governing switch to intercuit in which the magnetic element of the pump is energized, a stroke-controlling switch device which is automatically operated oppositely by the opposite pumping strokes for-alternately making and breaking the circuit connections, the circuit containing a governing switch device comprising a member exposed to the action of the liquid at any time contained in the accumulating chamber, the conduit from the source to said chamber having a bore affording access of the liquid pressure in said conduit to said switch operating member, and connections from said member for operating said governing switch to interrupt the circuit upon the pressure in said conduit reaching a predetermined degree. i

13. In the construction defined in claim 12, the switch-operating member being adapted to react automatically for closing the circuit upon reduction of the pressure thereon of the pumped liquid below the predetermined degree.

14. The construction defined in claim 6 having the pendulum lever dimensioned relatively to the distance of the fuel tank on the vehicle rearwardly from the carbureter to cause the variation of the force exerted by the pendulum lever upon the valve for closing it to correspond with the variation of the hydrostatic pressure due to the relative elevation of the fuel tank with respect to the earbureter.

In testimony whereof, I have hereunto set my hand at Chicago, Illinois, this 9th day of February, 1928.

PERCIVAL S. TICE.

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