US1837504A - Electrically operated motive device - Google Patents

Description

Dec. 22, 1931. P. s. TlcE ELECTRICALLY OPERATED MOTIVE DEVICE Filed-Feb. 14, 1929 Patented yDec. 22, 1931 i,

UNITED. STATES 'PAfraNr OFFICE PERCIVAL S. TICE, F CHICAGO, ILLINOIS, ASSIGNOR T STEWART-WARNER CORPORA- i TION, OF CHICAGO, ILLINOIS, .A CORPORATION 0F VIRGINIA EDEC'IBICALLY OPEBATED MOTIVE DEVICE *i Application led February 141929. Serial No. 339,873.

The purpose of this invention is to provide an improved construction of fuel feeding system for an internal combustion engine 0f a motor vehicle, comprising an electromagnetic pumping device for supplying the fuel to the engine carbureter from a main supply tank located at the customary position at the rear of the vehicle and at a lower level than the'carbureter except when the vehicle is descending a steep grade.

One characteristic feature of the invention concerns the electromagnetic pump which is located in the lower part ofthe main fuel supply tank at the rear of the vehicle so that it is submerged in the fuel when the tank is occupied by fuel.

` Another characteristic of the inventionconcerns the location of an automatic switch for interrupting the pump-energizing current when the pressure by which it is fed to the carbureter reaches a predetermined de gree, said switch for controlling the ump,-

located as stated, in the rear main uel sup- 4 ply tankfor controlling the fuel pressure at the carbureter,-being located on top of the tank outside the same, and thereby remotely from the carbureter 'at which the presstroke-controlling switch of the electromagnetic pump.4

' Figure 4 is al detail section at the line 4-4 on Figure 3 on an enlarged scale.

.v Figure 5 is a vdetail section at the line 5 5 onvFigure 1. l

Referring to the drawings: A carbureter of conventional form and construction in 'customary position on the engine maybe understood to be connected with the apparatus shown in thedrawings by the ipe, 14, as in-` dicated by the arrow leading rom that pipe in Figure '1. The main fuel supply tank is indicated at C: having in the lower part, so as to be submerged inthe liquid content of the tank, an electro-magnetic pumping device which will be more particularly hereinafter described, indicated as to entirety by the reference letterlX.

The current source for energizing the electromagnetic element ofthe pump is indicated conventionally at D, from which a circuit wire, 10, is shown running to the engine ignition switch at 11, and thus to a coil at 12, from which a circuit wire, 13, is shown leading to a fitting, E, mounted on the top of the tank'C, and constituting the fuel discharge connection from the pump located within the tank to the carbureter, as indicated by the fuel pipe line, 14. v

To this fitting at the intake to its chamber, e, at' the inner s1de,.within the tank, the pipe, 15, which constitutes the immediate discharge ,connection of the pump', is connected at 16. i The circuit wire, 45, to the electromagnetic element of the pump extends in the ipe, 15, being connected inside the fitting, to the insulated contact, 17, of a switchv or circuitmaking-and-breaking device, of which the cooperating contact, 18, is. carried on the free end of a spring bar, 19, insulatedly mounted inside the fitting, E, by means of an insulated -binding post, 21, to which outside the fitting,

the current wire, 13, is secured by a binding nut, I22.

The cavit clamped to'the littirg b a spider, 24, secured by screws, 25; an t e ,diaphragml has a stem, 26, secured to it at its center and serving for clamping the central area ofthe diahragm between disks, 27 and 28, said stem being secured* at the lower end to the spring,

contact-carrying' bar, 19; and a coil spring, 30, is interposed above the diaphragm reacting between the diaphragm and the cen` tralc hub of the' spider, 24, a centering screw, 31, being set throughthe hub of the spider for positioningv the spring at its upper end,

l y, e, ofthe fitting, E, is closed at i lthe upper side byfa flexible diaphragm, 23,

and the clamping screw, 29, which holds the stem, 26, and the disks, 27 and 28, to the diaphragm, has its head elongated and tapered at the upper end to perform a similar function at the lower end of the spring.

The contact, 17, is carried by a fiat strip of conductive metal, 32, which is mounted on a bar, 33, of insulating material and conductively ,secured to the circuit wire, 45,' said insulating bar, 33, being mounted at an inlet port, 34, in the bottom of the fitting, E, said ar not bein -dimensioned for closing the port, but for eing stopped by lodgement of its opposite ends at the margin of the port where it may be secured fixedly to the bottom of the fitting, E.

Upon considering this construction, it may be readily understood that the pressure of the liquid pumped, producing pressure in the chamber, e, of the fitting, E, hereinafter called the fuel pressure chamber,-operating on the diaphragm, 23, will at some stage ovcrcome the resist-ance of the spring, 30and the stiffness of the spring bar, 32, and cause the diaphragm to lift the contact button, 17, out of contact with the contact button, 1,8, breaking the circuit and interrupting the energizing of the electromagnetic element of the pump and causing the pumping action to cease.

And it will be understood that by this means the pressure of the fuel at the carbureter is predetermined and maintained at the predetermined degree, the pump ceasing to act the instant the pressure reaches that degree, and resuming action the instant it falls the least below that degree.

The detail structure of the electromagnetic pump will now be described.

It comprises a casing, 40, which in the precise form illustrated,'is a die-casting containing a cylindrical main chamber, 41, in which there `is snugly fitted the electromagnetic pump unit which may be identified as to its entirety by the enclosing cylindrical shell, 51, encompassing the electromagnetic element which is of a solenoid type comprising the spool consisting of a central tube member, 52, and heads, 53 and 54, with the circuit windings, 55,I occupying the annular space between the spool heads.

The tube member, 52, constitutes also the pump cylinder in which the solenoid armature, 56, operates as the pump-pistombeing lfor that purpose furnished with suitable packing rings, 56a." The solenoid has at one end a fixed head, 57, of magnetic metal which supports an axially positioned stem, 58, on which the reciprocating armature-pis ton, 56, slides in its reciprocation. This stem is reduced in diameter over a portion of its length toward its free end. forming a shoulder, 59, and the axial bore of the armaturepiston which accommodates the stem is counterbored for admitting the unreduced portion of the stem, and to form a shoulder, 60; and a coil spring, 61, interposed on the stem between the shoulders, 59 and 60, is dimensioned and initially compressed for reacting between the stem and the armature for normally stressing and holding the arma ture-pistony at the limit of its stroke away from the fixed magnetic head, 57.

The casing, 40, has at the bottom of the chamber, 41, inlet ports, 62 and 62, located respectively beyond the opposite ends of the solenoid shell, 5l, said ports being controlled by inwardly opening check valves, 63 and 64, respectively; and at the upper side said casing contains al chamber, 65, communicating by ports, 66 and 67, with the main chamber, 41, said ports being controlled by outwardly opening check valves, 43 and 44; and it is within this chamber, 65, that the pipe, 15, communicates for fuel delivery to the fuel pressure chamber, e; and the circuit wire, 45, is connected in this chamber to an insulated conducting pin, 46, which is mounted in the horizontal partition, 68, which separates the chambers, 65 and 41; and from the inner end of said conductor pin, a resilient conducting clip, 46, extends for resilient contact with a contact button, 69, mounted insulatedly in the head, 54, of the solenoid spool and having the circuit winding, 55, soldered to its inner end, thus serving to conduet the current from the current source to said windings for energizing the electromagnetic unit, when the circuit is closed as hereinafter described.

The fixed magnetic'head, 57 is apertured for fluid communication between the cham ber, 41, and the pumping chamber; and it will be understood that suitable means being provided for automatically interrupting the solenoid energizing circuit at the completion of the armature-piston stroke which is caused by energizing the solenoid and re storing the connection upon the opposite stroke caused by the reaction of the spring, 61,-the pump will be double-acting, taking in fuel at the port, 62, in the stroke of the an mature-piston toward the head, 57

In that stroke the pump discharges fuel through the aperture in said head and out through the port, 67, past the check valve,

44, and on the opposite stroke taking in fuel f beted at its inner circumference as seen at ness of the annularvmember, 70, at its 'rablbeted inner margin.

to the insulated' annular member, 70,

This conductive disk stamping, 7 3, is held by a flat spring member, 75, riveted as shown at 76, tothe upstruck central part of the stamping at the coincident centers of said parts,

the ends of the spring, 7 5, being lodged on the outer side of the insulated annular memlowed by a drive fitted terminal ring or sleeve, 77.

I This sleeve, 77, thus constitutes the terminal of the armature-piston at the end which is thrust by the reaction o'f the spring, 61, toward and into contact with the conductive insulated stamped disk, 73. This disk, insulated as described. is conductively connected with the solenoid winding. 55. b v means of extending the end of said winding insulatedlv through the spool head, 53, in which also it is made fastby a headed contact pin, 78. whichfmakes contact with the free end of the spring, 79.- secured at the other end' bv the rivet which secures the fiat spring. 75, to the stamping 73. and havingk its said free end reflexed in C-sbape around the outer edge of the part. 70. so as to terminate onposite the head of the contact pin against which it reacts resiliently for maintaining contact throughout the short ranges of movement. of the stamping, 7 3, in the rabbet of the part, 7 0.

Upon considering this construction it mav be seen that the reaction of the spring, 60, tending to thrust the armature-piston into contact with the insulatedly supported conductive stamping, 7 3, causes the circuit to be closed by grounding through the armaturepiston and the conductive spool and casing constituting ground connection; and that such closing of the circuit causing the magi l netic armature-piston to be retracted from the conductive stamping, breaking the circuit and releasing the armature-piston from the magnetic pull of the electromagnet, leaves it subject again to the reaction of the spring, 60, whereupon the cycle of reciprocation is repeated. g i

But it may be observed that in the absence of some means for prolonging the closure of the circuit to' ive time for the armaturepiston to respon to the magnetic impulse by actual movement through a substantial part of the stroke, the current will be broken, leaving the spring in control of the armaturepiston Without any substantial stroke being made by the latter. 4 y

This is prevented by ymountingthe conductive member, 73, resiliently for very slight reaction in either direction, and making it of magnetic metal. If itis normally held stopped on the insulation, 7 0*, with Vso s ight reaction that the momentum of the armature-piston will carry it to the limit of the stroke derived from the reaction of the spring, 60, before it can respond to the magnetic attractionl resulting from the closing of the circuit by its contact with the part, 73, the resilient lreaction of the flat spring, 7 5, will cause the part, 7 3, to'follow the magnetically causedstroke of the armaature-piston and maintain the circuit connection until said part, 73, collides again with the insulation,v 7 0a, leaving the armaturepiston to complete the very short remainder of its stroke by momentum before thus yielding to the reaction of the spring, 60, for its return stroke. f l

Or if the spring support of the part, 73, is arran ed sothat said art is -normally held wit slight force at tile other limit of the rabbet,sa1d part being magnetic, will adhere to the armature-piston which becomes magnetized at the instant of contact with said part, 7 3, and will thereby be caused to follow the armature-piston in its magnetically caused stroke until, as in the first instance, the magnetic hold is broken by encounter with said installation.

By adapting the spring support of the circuit-closing part, 73, afforded by the spring, 7 5, "to normally hold the latter at an intermediate position in the rabbet, 71, between the bottom thereof and the insulation, 70, said spring support reacting for yielding of the parts, 7 3, to the inal portion of the springcaused stroke of the armature-piston, and also causing said part, 7 3, to follow the armature-piston in the iirst part of its reverse,- magnetically caused,-stroke, the construction is adapted to operatefor'the purpose of maintaining the circuit connection suitable for ensuring an effective magnetically caused stroke, both when the part, 73, is, and when it is not, of magnetic metal and adapted thereby to be held magnetically to the armature-plston While the circuit is closed forenergizing the electromagnetic winding.

I claim:

I,1. An electromagnetic device comprising an electromagnet and a reciprocable armature co-operating therewith for stroke in one direction when the electromagnetic Winding is energized; other means for giving the armaconductor breaking the circuit and releasing Y the armature for repeating its .said reverse stroke.

2. An electromagnetic device comprising an electromagnet and a reciprocable armature co-operating therewith for stroke in one direction when the electromagnet is energized; non-magnetic means for giving the armature its reverse stroke, a circuit-makingand-breaking device for controlling recipro cation of the armature consisting of an insulatedly supported conductor positioned forencounter of the reciprocating armature in the non-magnetic stroke of the latter; whereby the circuit is closed through the armature causing it to be magnetically retracted from said conductor, breaking the circuit and releasing the armature for repeating its stroke in said reverse direction.

3. An electromagnetic device comprising an electromagnet and a reciprocable armature co-operating therewith for stroke in one direction when the electromagnet is energized; means reacting on the armature lor giving it reverse stroke; a circuit-makingand-breaking device or controlling the reciprocation of the armature consisting of an insulatedly supported conductor positioned for encounter of the reciprocating armature in its said reverse stroke, whereby the circuit is 'closed through the armature causing it to be magnetically retracted from the conductor for breaking the. circuit and releasing the armature for its said reverse stroke.

4. An electromagnetic device comprising an electromagnet and a reciprocable armature co-operating therewith for stroke in one direction when the electromagnet winding is energized, other means for giving the armature it reverse stroke; a circuit-making-andbreaking device for controlling reciprocation of the armature consisting of a resiliently and insulatedly supported conductor in conductive connection with the circuit windings of the electromagnet, said device being positioned for encountering and resiliently yielding to the reciprocating armature in the rst mentioned stroke of the latter; whereby the circuit is 'closed and'maintained closed during the resilient yielding movement of the armature, causing it to be magnetically retracted from said conductor breaking the circuit and releasing the armature. 4

5. An electromagnetic device comprising an electromagnet and a reciprocable armature co-operating therewith for stroke in one direction when the winding of the electromagnet is energized; other means for giving the armaing the conductor 'for breaking the magnetic hold of the arma-ture thereon and permitting the conductor to be resiliently retracted to its normal position, breakin the circuit for terminating the magnetical y caused stroke and releasing the armature for repeating itsreverse stroke.

6. An electromagnetic device comprising an electromagnet and a reciprocable armature co-operating therewith for stroke in one direction vwhen the electromagnet is energized;- other means )for giving the armature its reverse stroke; a circuit-making-andbreaking device for controlling the reciprocation of the armature, consisting of a magnetic resilient and insulatedly supported conductor conductively connected with the electromagnet circuit winding and positioned for encounter of the reciprocating armature in the nonmagnetic'stroke of the latter; whereby the circuit -is closed through the armature causing it to be magnetically retracted, attracting and holding said conductor, so that the circuit is maintained closed during the initial part of said retraction7 and means arresting the conductor 'for breaking the magnetic hold of the armature thereon, permitting the conductor to be resiliently retracted to its initial position, breaking the circuit and terminating the magnetically caused stroke to release the armature for repeating its reverse stroke.

7. An electromagnetic device comprising an electromagnet anda reciprocable armature co-operating therewith for stroke in one direction when the electromagnet winding is energized; other means for giving the armature its reverse stroke; a circuit-makingqandbreaking device for controlling the recipro- .cation or" the armature consisting of a magnetic resiliently and insulatedly supported lll conductor conductively connected with the electromagnetlc circuit windings and positioned for encounter of the reciprocating armature in the non-magnetic stroke of the latter; whereby the circuit is closed through 'the armature causing it to be magnetically retracted, retracting and holding said conductor so that the circuit is maintained closed during the initial part of said retraction, and means arresting the conductor for breaking nao the magnetic hold ofthe armature thereon and permitting the conductor to be resiliently retracted to its normal position, breaking the circuit and terminating the magnetically caused stroke and releasing the armature for repeating its non-magnetic stroke.

8. In the construction defined in claim 1,

the circuit-making-and-breaking device consisting of an electrically conductive disk of magnetic metal in the electromagnet-energizing circuit, the mount for the disk consisting of an insulatedly mounted part, said disk being spring-supportedon the insulated mount at the opposite side lof the latter from the armature-piston, the mount being formed for exposing the disk to the encounter of the armature in its non-magnetic stroke and for being encountered by the disk in the ma netically caused stroke of the armature, hol ing the disk by magnetic attraction. 9. An electromagnetic device comprising an electromagnet and a reciprocable armature c-operating therewith for stroke in one directionV when the electromagnet winding is energized; other means for giving the armature reverse stroke; a circuit-makingand-breaking device controlling the reciprocation of the armature, comprising an insulated mount, a magnetic conductor and resilient means by which yit carries the magnetic conductorin position for encounter with the reciprocating armature in said reve/rse stroke 'of the latter for closingthe circuit, magnetizing the armature for magnetically attracting and holding said magnetic conductor, said insulated'lmount having an aperture in a plane transverse to the stroke of. the armature, said conductor being positioned spanning said aperture at the side toward the armature, said last mentioned means consisting of a flat spring spanning the aperture at said opposite side, and ailixed to the magnetic conductor through the aperture.

10. An electromagnetic device comprising an electromagnet and a reciprocable armature co-operating therewith for stroke in one direction when vthe electromagnet winding is energized; other means forgiving the armature reverse stroke; a circuit-making-andbreaking device controlling the reciprocation of the armature; an insulated mount and resilient means by which it carries the magnetic conductor in position for encounter with the reciprocating armature in said reverse stroke of the latter for closing the circuit,

magnetizing the armature for magnetically attracting and holding said magnetic conductor, the circuit connection of the eletromagnet windings with the magnetic conductor being effected by a contact pin terminal of the winding insulatedly carried by the munt, and a spring contact carried by the magnetic conductor.

11. In the construction defined in claim 10,

the circuit connection of the electromagnet windin with the magnetic conductor being eiec'tet by a contact pin terminal of the winding insulatedly carried by the mount exposed at the side thereof opposite the electromagnet spool head, and a spring contact member made fast at one end to the magnetic conductor through the aperture of the mount and extending at the side of the latter opposite the spool head, flexed to embrace the periphery of the mount and terminating at the side thereof toward the spool head for yielding contact with said contact pin.

In testimony whereof, I have hereunto set y hand at Chicago, Illinois, this 31st day of January, 1929.

' PERCIVAL S. TICE.

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