US2511006A - Liquid dispensing apparatus - Google Patents

Description

June 13, 1950 c. F. PRANGLEY 2,511,006

LIQUID DISPENSING APPARATUS Filed March 16, 1944 4 Sheets-Sheet 1 METER PIMP? INVEN TOR.

2,51 LOW?) June 13, 1950 vc3. PRANGLEY LIQUID DISPENSING APPARATUS 4 Sheets-Sheet Filed March 16, 1944 J05 J04 73 65 .95 J00 nonrim IN V EN TOR.

June 13 3950 C. F. PRANGLEY LIQUID DISPENSING APPARATUS Filed March 16, 1944 4 Sheets-Sheet 3 zaz IN VEN TOR.

Patented June 13, 1950 UNITED STATES PATENT OFFICE LIQUID DISPENSING APPARATUS Curtis F. Prangley, Evanston, 111. Application March 16, 1944, Serial No. 526,722

13 Claims.

This invention relates to liquid fuel pumps of the gasoline service station type, in particular to computer pumps which compute not only the volume of liquid dispensed but also the total cost thereof at any prevailing price per unit of volume.

Among the objects of the present invention are to provide in a liquid fuel dispensing system including a source of liquid supply a liquid displacement meter and a dispensin hose, computing and registering means actuated by a power source independent of the liquid supply system but controlled by the liquid displacement meter and, in turn, controlling the initiation of operation of the dispensing system; to provide in such a system an electrical follow-up mechanism or system controlled by the liquid displacement meter and operating the computing and registering means; to provide in such a system a novel and simplified computing and registering means; to provide computing and registering means which may be disposed remotely from the source of liquid supply, the liquid displacement meter and the dispensing hose, and to provide in such a system simple, automatic register resetting means.

Other and further objects will be apparent from the following specification when taken in connection with the accompanying drawings, wherein:

. Figure l is a view in elevation with parts broken away, showing the application of the invention to a service station gasoline pump;

Figure 2 is a view in horizontal section taken substantially along the line 2-2 of Figure 1;

Figures 3 and 4 are fragmentary views in vertical section taken substantially along the lines 3-3 and 4-4 respectively of Figure 2;

Figure 5 is a diagrammatic view of a registering means and includes a, schematic diagram of the electrical connections;

Figure 6 is a diagrammatic view showing in section the motor drive of the cost registering means and its controls;

- Figure 7 is a view similar to Figure 1 showing a modification of the pump;

Figure 8 is a view similar to Figure 1 showing a modification of the pump stand;

Figure 9 is a view in section taken on the line 8-9 of Figure 8;

Figures 10 and 11 are views showing a modified form of motor switch control means; and

Figure 12 is a view similar to Figure 5 show ing a circuit embodying the control means of Figure 10.

The invention is shown, for purposes of illustration, and not by way of limitation, in connec- 2 tion with a modern type of dispensing device or service station pump.

Referring now to the drawing in detail, there is shown an underground tank 2 adapted to hold a quantity 4 of gasoline or other liquid to be dispensed. A pipe 6 of a, dispensing line projects downwardly into the tank 2 and'is provided at its lower end with the usual type of foot valve (not shown). The upper end of this pipe 6' projects into a casing or housing 8 which may be of any conventional type and connects with any usual type of pump I0 driven in the conventional manner by an electric motor I2. The pump discharges through a pipe 14 of the dispensing line into the air eliminator 16 of conventional structure and thence by means of pipe 20 of the dispensing line into a liquid displacement meter 22, from which the liquid passes through pipe 24 of the dispensing line. This meter may be of any general type and includes a meter shaft 26 which is rotated by means of the liquid flow through the meter, causing pistons or a wobble plate of the liquid displacement mechanism to turn the shaft 26 in accordance with the flow of liquid through the meter.

The pipe 24 may be connected at its upper end, which passes out of the housing 8, to any type of sight glass 28 and from the sight glass the liquid passes through the usual dispensing hose 38 and thence out through the nozzle 32 which is provided with a common nozzle valve 34. When not in use the nozzle and nozzle valve are supported on the conventional hose hook 38 carried by the housing 8 and overlie the outer end of the conventional lever 38 which through the usual rod 40 controls the usual motor switch 42 (schematically indicated in Figures 5 and 6), this switch being commonly termed the nozzle switch for it can be operated to closed position only when the nozzle is off the hook 36 and must be moved to open position before the nozzle is returned to the hook 36.

The switch rod 40 is provided with a .latch member 44 (Figure 1) carried at the outer end of a bar spring or strip 46 fastened at its other end to the rod. This latch cooperates with a companion latch member 48 released by a solenoid 50 and urged into latching position by a spring 52 encircling the member 48 and bearing at one end against the fixedly mounted solenoid and at the other end against a collar on the member 48. Both latch members 44 and 48 are preferably formed with beveled faces so that the latch member 44 may move over the member 48 when in projected position so that the switch rod 40 can be moved upwardly to move the switch 42, even though the member 48 is in fully projected position. The member 48, as will hereinafter appear, serves to prevent closure of the motor circuit if the registering means is not reset between dispensing operations.

The meter shaft 26 drives directly or through any suitable gearing an alternating current a speed control for the cost register, indicated generally by the numeral 60.

As shown more particularly in Figures 2 to 5,

the volume register 58 comprises a film strip 62 wound on a supply roll 64 similar to the usual film supply roll common in motion picture apparatus, the roll 64 being detachably mounted on a drive shaft 66 in amanner' as is conventionalvinsuch apparatus, and being fed from the 'roll' B4to a like takeeup roll'68, also detachably' mountedinthe' same manner on its drivegslia ft 10. Theffilm "62"has printed on it, in any known "manner,'two "sets or series of numeralsior indiciai'lZ and '14 which represent the quantity orvoiume of'liqiiid dispensed. It

will be evident that each series of numerals may be compose arnumper'srunning from z'ero to any, efonv'enienfimaxi'riium'amount in units, tens and'fractio'ris of gallons, and the numbers ma'kingupeachjseries will'b'e spaced longitudinally ofjthefilfii.

Th'e "in, its passage from its supply roll 64 to'TtheItake-u'p roll "(it passes over suitable projection apparatus [6 which may comprise a film'jgate and supporting base 18 in a light box 80' having slots in itsopposite edges to perinit passage lof the film therethrough A projectien'source 82 comprising one or more projection amps, which may be o f relatively low ower, is mounted in the bottom of the light,

box 8 in alignment with the picture or light aperture ofthe film gate 18. -From the aperturei 84 thelight passes through the film or through; ti ie numerals on :the film to 'mirrors, prisms or other, light reflecting a means 86 and 88 by which the, light-rays are directed, through lens or other focusingmeans 90 and 92, ontotranslucent; glass plates 7; or translucent screens 94 and 96, theplate'or screened being set in a suitable holder on, an :escutcheon carried by one side .wall of the housing .8 and covering a suitable gpening in the housing. The screen or plate 96 isxsimilarly. mounted::on the opposite wall of the housingandgthe mirrors or reflecting means $533,116.18 are relatively inclined ppositely at45jdegrees to. the path of light. from the projectionisource. One reflecting means is aligned vertically with that portion of the film onwhichone series of numbers is m'arked, while,

the:other;reflecting-means is vertically aligned withthelportion'of'the'film on which the other" plates mounted 'interiorly' of'the' housing and exposed through suitable transparent windows in the housing. A suitable shield (not shown) may be formed over the translucent plates to prevent the suns rays from directly striking the plates, or there may be provided a short enclosing shield (not shown) around the glass plate for further excluding the direct rays of the sun at any time.

The film strip may be rendered opaque while the numerals are rendered transparent in any well-known manner or, conversely,'the' strip may be rendered transparent and the numerals j opaque so as to secure the maximum contrast between the reproduction of the numerals on -the-screens and the remaining areas of the screens,

The film is provided with a control cut-out 98'so positioned as to engage a roller (not shown) or operating member of a Micro switch unit of conventional structure embodying an operating lever I02 carrying a roller which is adapted to. ride 'on the .s'urfacefof the film and, when aligned with the control cut-out 98, to sink therethrou'gh and operate the multiple switch plates of the fMicro switch unit, so as to openthe contacts I04 and T6 and close the contact 108". When the roller rides out of thecontrol cut-out it lifts the operating member or lever I02 and closes the contacts I04 and [-06 and opens the contact [08. H I

The shaft '66 and, consequentlythe feed roll 64 are driven'by an alternating current rewind; motor I I 01 mounted in any suitable manner within the housing through a gear l l2 on the motor shaft meshing with the gear, [l4 on the countershaft H6 carrying a gear H8 meshing with agear I21! on a shaft [22 coupled to the shaft -66: by any suitab-le electrically operable clutch I24, such as, for example, a solenoid operated clutchof suitable conventional construction in which the clutch parts vare engaged only when the actuating solenoid is energized and so long as the solenoid is deene rgized the spring of the clutch holds the clutch parts in disengaged position.

The film take-up reel 68 isdriven to feed the film in a reverse direction by means of an alternating curent Selsyn motor or receiver 126 of conventional structure connected by the usual four-wire cable I28 to the alternating current Selsyn generator or transmitter 54, so that the shaft l3!) of the motor isdriven'inexact synchronism'with the shaft of the generator as it is rotated by the meter 22. The shaftlifl may beconnected to' theshaft' 1-0 of the take-up roll '63 in any suitable manner, preferably by means of an intermittentmotion mechanism or Geneva i32, of which-the driver'is connected to the shaft 39 and the driven 'part'c'on'nected to a shaft I3 3 connected by any conventional one-way clutch, such asa roller clutch I36 to the shaft iii. 7 The intermittent motion mechanism serves to advance the film step by -step" to positionsu'c cessive' numbers over the aperture 84 in proper succession so as to integrate, in'effect, the move ments of the meter and thus indicate by the registering means successive predetermined increments of movement of the meter rather than instantaneous movements of the meter.

The cost register 60 is s'ir nilar inconstruction to the volume register 58 and comprises a film- I38 similar to the film 62 and-similarly formed with two series of numerals I 40 and I42 similarly arranged to indicate the cost .of the liquid in dollars and cents. .Thefilm f38'is supplied "from a supply roll I44 detachably mounted on the drive shaft I46 and driven directly by the motor IIO through an electrically operable clutch I48 similar to the clutch I24.

It will :be evident that the films may be fed from the supply rolls to the take-up rolls by feed sprockets in advance of the take-up rolls, with suitable loops between the sprockets and the take-up rolls, the sprocket and take-up roll for each film being geared to each for synchronous driving, as is usual in film projection apparatus.

The film is fed from the supply roll and passed over a picture gate or anvil, not shown but similar to the picture gate 18, by means of a take-up roll I50 detachably secured to a shaft I52. The take-up roll I50 is driven by an alternating current actuated, direct current speed controlled, induction motor, eddy current clutch I54 through an intermittent motion mechanism or Geneva movement I58 which is connected to the shaft I52 through a one-way clutch I 58 similar to the clutch I38.

The film I38 is provided with a control cutout I 80 similar to the control cut-out 88 for similarly controlling the operation of a Micro switch unit I62 of the same structure as the Micro switch unit I00, and the unit I82 comprises a pair of normally open switches I54 and I66 and a normally closed switch N58.

The induction motor eddy clutch I54 comprises, as best seen in Figure 6, a housing I in both end walls of which is journaled the drive shaft I12. Two rotor parts I14 and I16 are journaled loosely on the shaft I12 for rotation relative thereto in opposite directions. The rotors I14 and I16 are each of the well-known short circuited rotor type. A cylindrical body or eddy current clutch member I18 is secured to the shaft between the rotors I14 and I16 and at its opposite ends projects into two annular slots in the inner faces of the rotors I14 and I16. The cylinder I18 is formed of copper, or other good electrically conducting material. The alternating current windings I80 and I82 are formed on the usual core members and positioned in proper alignment with their respective rotors. In a groove in the outer face of the rotor I14 there is inserted a direct current winding I84 to which current is fed through a supply cable I86 through the usual motor slip rings (not shown). A like direct current exciting winding I88 is inserted in a similar recess in the rotor I16 and this winding is similarly supplied with direct current through a supply cable I90. It will be evident that as a result of the eddy currents induced in copper cylinder I18 by the rotor I14 the cylinder will be impelled in one direction of rotation with a certain slip. Similarly by reason of the eddy currents induced in the cylinder by the other rotor I16 it will be impelled in the opposite direction with a certain slip. So long as the eddy currents induced in the currents from both rotors are equal, the cylinder will remain stationary and when one exceeds the other, the cylinder will be driven in a direction corresponding to the greater. Alternating current in proper phase relation is fed to the alternating current windings I80 and I82 through motor leads I92 and I04, connected to the alternating current supply leads LI and L-2 in one of which the nozzle switch 42 is inserted as shown in Figure 5.

Direct current is applied to the eddy clutch exciting winding I84 from the motor driven tachometer generator 56 which is connected to the cable I86 through a cable I96 and an electrical price variator I98, which comprises a potentiometer 200 connected across the cable I96 and having its wiper arm connected to the cable I86. The wiper arm of the electrical price variator I96 may be connected in any desirable manner, as for example as illustrated in my copendin application, Serial No. 496,421 filed July 28, 1943, now Patent 2,400,888, or my copending application, Serial No. 505,753 filed October 11, 1943, now Patent 2,428,382, to the price per gallon indicator 202 (Figure 1) mounted in the housing 8, and having suitable dials displayed behind a window in the housing.

Direct current for the eddy clutch exciting winding I88 may be supplied from the alternating current supply leads I92 and I94 through a half or full wave rectifier 204 of conventional structure and a potentiometer 206 connected across the outer terminals of the rectifier and to the cable I90, with the wiper of the potentiometer being connected to one of the wires of the cable I90.v By adjustment of the potentiometer 208, the speed of operation of the eddy clutch I16 for minimum rate of dispensing may be calibrated and the rotation of this member so dampened dynamically as to cause it to stop practically instantaneously in its forward rotation when the flow meter 22 stops, due to the closing of the nozzle valve. In fact, with the proper adjustment, the eddy clutch member I18 can be brought to a stop and reversed in either direction of rotation just slightly before the meter comes to a complete stop so that the driving of the cost register means ceases at the very instant the nozzle valve is closed even though there should be a slight la between the closing of the nozzle valve and the stopping of the meter, which, of course, in conventional apparatus, causes a building up of pressure in the flexible dispensing hose but occasions no flow of liquid through the nozzle valve.

It should be noted that it is within the contemplation of this invention to employ an induction motor eddy current clutch having only one alternating current actuating winding, one rotor and one direct current eddy clutch exciting winding where the registering means or mechanism driven by the motor supplies a sufficient frictional or inertia load to bring the driven eddy clutch member I18 quickly to rest on a stopping of the meter 22.

As shown in Figure 5, the pump motor I2 is connected to the supply lines L-I and L-Z, on the load side of the nozzle switch 42, by the supply wires 208.

The film rewinding motor IIO is connected on one side to the supply line L-I through wire 2I0 and on the other side to supply line L-2 through wire 2I2, a first contact 2I4 of a manually operable switch 2I6, wire 2I8, switch I66 of Micro switch unit I82 or switch I06 of Micro switch unit I00, and wired to supply line L-Z in advance of the nozzle switch 42 so that the circuit to the rewind motor may be completed when the nozzle switch 42 is open. It should be noted that the switch I66 of the Micro switch unit I62 and switch I06 of the Micro switch unit I00 are connected in parallel to the wires 2I8 and 220 so that the circuit to the rewind motor may be completed or maintained by either of these switches. The reset interlock control solenoid 50 is connected on one side to supply line LI as by wire 222 and on the other side through wire 224, switch I08 of Micro switch 2, s1 Loos 7 unit mt,:'switeh: it's of Micro 'switch unit I62, to wire 226 and then" through wire 2211 to: supply line-k2 in advance of the nozzle switch n so that this solenoid may' be energized when-the n zzle switch is open.

The eleetrically operable clutch I48 is connected on one side by' wire 2 28 thesecond switch Co'ntact ZEfi of the reset switch 2-I-6" and wire: 232 to supplyli-ne LI, and o'n it's other side isconn'ectedthrough wire 2'34, switch I64 of Micro switchunit I62, Wire 2 and wire 226 to the supply-l-ir ie L2. The electrically-operable clutch rat is similarly eonnected tcthe supply lines Ir--I and L-2. On one side it is connected through wheres, thircl swi tch 246 of reset switch 2 I-6, wire lfl' and Wire- 232 to supply line LI. On its other side this clutch-is connected'through wire 2 M, switch I64, of Micro'switch'unit I00, wire 246, and" wires 236 and 220: to the supply line It should be noted that both of these electr ically operable clutches are connected to sup-- my line L--Z in advance ofthe nozzle: switch 42.

The operation of theinvention in the form shownin Figures 1 to 6 is as follows: The master switch 248 for the suppl line being-closed to energize the entire equipment, when it is desired to dispense gasoline the nozzle isremoved from the hook 36 and the s'witchlever '38 operated. If the registers arein zferoized position so that the lever-carried operating rollers and the Micro switch units are in the control cut-outs 98 and It will be clearthat if either one of the switches 168 or I-66'is' in open position by reason-of the fact that its associated registering mean is not in z'eroized-position, the solenoid will not be ener- :giz'es. Wnenthe solenoid is, however, energized, it withdraws the latch member 48 from the'latch member uandallowsrnove'ment of the switch 1ever'48 and switch i'od'fifls'oas to close the -noz'z1e switch 4'2. on closure of' the nozzle switch-'42, the puinp di iving motor I2 is'en'ergized' through the circuit previousl described. The p'urnp lfl is' ther-e'by driven'hut, being of the conventional bypass type, merely bypasses the liquid from its high pressure side toits low pressure side until the nozzle "valve 34 is opened. On opening of the nozzle valve 34, the meter 22 is driven by,

the liquid as it is dispensed. The consequent rotation of the meter shaft/ '26 effects rotation of the rotor of the Selsyn generator or transmitter 54 and of the tachometergenerator '58. The tachometer-generator supplies electric energy at a current 'or voltage proportionate to the speed or the meter shaft- 25 and the proportionof this ener delivered to the exciting winding I84 of the induction motor eddy current clutch isdeterinined'by adjustment-of the price variator I 98 of which the potentiometer is calibrated in accordance-with the price per-unit of fvoluine of the liquid-dispensed, so that theproportion'of energy delivered may be variedWith the variations in "price of the liquid. 7

The "induction -motor eddy current clutch, therefore, through the intermittent motion mechanism 7 I Ee-and'the one-way clutch 58 drives the film feeding or 'take up roll Ion-in predeterr'nincd speed'ratio to the-shaft 26. As the'film' is-thus fed, the cost numerals carried thereby are successively and progressively brought in line with the projection aperture in the picture gate and therethrough projected onto one of the screens or translucent plates 94 and 96 in opposite faces of'the housing.

Through the alternating current Selsyn system comprising the transmitter 54 and the receiver I 26, the film 62 or" the volume registering means is driven in exact and unvaryi'ng positional synchronism with themeter shaft 26 so that the amount numerals on the film 62 are successively and progressively brought before the projection aperture 84' in thepicture gate I8 and thus projected on-the screens at opposite sides of the housing.

As the films 62 and I38 are moved by their respective feed rolls away from zeroized position,

the lever carrying rollers of the Micro switch units I59 and It? are lifted so that the switches I 04 and I126 of the unit 196 and the switches I64 and I55 of the unit I62 are closed, while the switch I68 of the unit I59 and the switch I68 of the unit I52 are opened. The closing of the switches lei, I56, I64 and I66 efiects partial completion of the circuits to the rewind motor H6, the electrically operable clutch I48 and the similar clutch IZd. However, these circuits are not completed at this time since the manually operable reset switch 2I6 remains in open position.

The opening of the switches I68 and I 63 results in the deenergization of the solenoid 50 so that the spring 52 projects the latch member 48 into the path of the spring carried latch member 44.

When a dispensing operation is completed by the closing of the nozzle valve, the meter 22 stops and, consequently, no further electrical energy is supplied to the exciting winding I84 of the induction motor eddy current clutch I54. The

shaft driving clutch member I-I8 therefore stops, although the rotors rotate. Even if this clutch member, after stopping I74 and I16 continue to in its forward direction of rotation, reverses under the action of the rotor H6 and the exciting winding' I33, this is without effect so far as the cost registering film is concerned, since in view of the versed in rotation in the interval between the closing or the nozzle valve and the opening of the nozzle switch 52.

Since the rotor of the transmitter 54 stops when the meter stops, the volume film 62 stops at the same instant.

When the nozzle is hung on the hook, the switch lever 38 is simultaneously operated to raise the switch rod 46 and the spring carried latch member is springs over the latch member 38 so that the switch rod 46 cannot be again operated until the registers have been reset.

To reset the registers, the reset switch 2I6 is manually operated to close its switch contacts EM, 236 and 246 which complete the energizing circuits for the rewind motor III}, the clutch M8 and the clutch I24 through the circuits previously described. The film supply rolls 64 and IM arethus driven by the rewind motor in the opposite direction to wind the film onthe rolls. During this reversing or resetting-movement of the 9 films, the one-way clutches I 36 and I58 permit free reverse turning of the take-up rolls 68 and It will be evident, of course, that the cost registering film I38 and the volume registering film 62 will not ordinarily be moved the same distance in the dispensing operation and, therefore, will not return to zeroized position at the same instant. Whichever film arrives first at the zeroized position will first cause operation of its Micro switch unit. The film 62 will ordinarily arrive at zeroized position first since its distance of movement in a reverse operation is generally less than that of the film I38. Assuming this to be the fact, the Micro switch I will be first operated to open its switches I04 and I06 and close its switch I08.

On opening of the switch I04, the clutch I24 will be deenergized and, therefore, its clutch parts disengaged so that rewinding of the film 62 will be instantaneously terminated. Opening of the switch I06 has no effect under these assumed conditions, for it is merely connected in parallel to the switch I66 which remains closed. The closing of the switch I08 partially closes the circuit of solenoid 58, which circuit, however, remains open at the switch I60. Thereafter when the film I38 reaches its zeroized position, its "Micro switch unit I62 is operated to open the switches I64 and I66 and close the switch I60.

The opening of the switch I64 deenergizes the clutch I48 and the parts thereof then become disengaged. The opening of the switch I66 breaks the circuit to the rewind motor II 0 and thus terminates the resetting operation. The manually operable reset switch 2I6 may now be released and its contacts thus spring to open position.

When the price per gallon of gasoline exceeds 10 cents, the film I38 must move a greater distance than the film 62. When the price of gasoline is 10 cents a gallon then the two films move equal distances. When the price of gasoline is less than 10 cents per gallon, the film 62 moves a greater distance than the film I38. Under normal circumstances in most locations, the price of gasoline does not drop to or below 10 cents a gallon and, therefore, the switch I06 of the Micro switch umt I80 may usually be eliminated for the film 62 will usually return to its zeroized position before the film I38.

In the modification shown in Figure 7, the alternating current Selsyn motor or receiver I 26 may directly drive,through a. shaft 250 coupled to the shaft of the receiver, the usual mechanical volume register 252, while the induction motor eddy current clutch I54, through a coupler shaft 254, drives the usual mechanical register 256. In this form, as in the form shown in Figures 1 to 6, the electrical price variator I98 is coupled electrically, in the same manner, to the direct current tachometer generator 56 and the speed controlled eddy current clutch exciting winding of the induction motor I54, while the adjusting means of this variator is coupled mechanically in the same manner to a unit price indicator 258.

In this form, as in the previous form, the induction motor I54 may be connected to the sup- .ply line in the same manner as illustrated in Figures and 6.

In the form of the invention shown in Figure 8, the housing 8 is formed into two parts, one a lower part 260 and the second an upper part or turret 262 rotatably mounted on the lower part 260. The volume register 252, the cost register 256, the Selsyn receiver I26, the induction motor eddy current clutch I54, the unit price indicator 258 and the price variator I98 may all be mounted, in any conventional manner, in thi turret 262. In this form, however, the registers 252 and 256 may each be a single face register rather than the double face register, as in the form shown in Figure 7. These single face registers may be of the same structure as the conventional double face registers, but with the one face of each register being eliminated.

The turret 262 may be provided with any suitable handle or lever means by which it can be turned manually by the attendant. Such means may take the form of a ring 264 secured to the bottom of the turret 262. The electrical current from the alternating current Selsyn transmitter and the direct current tachometer 56 to the receiver I26 and the price variator I88, and from the supply line to the induction motor I54 may be supplied through appropriate cables, including cable I28 from the transmitter 54, cable I96 from the generator 56 and a cable 266 from the supply line, which latter cable includes the wires I92 and I94. These cables pass upwardly through a pipe or suitable hollow fixture 268 fixed to and supported by a bracket 210 secured to the housing part 260.

An explosion-proof housing, which may comprise a cylindrical depending wall 212 formed integrally with the bottom plate 214 of the turret, and a closure 216, may contain an inner drum 218 carried by the fixture 268, with the cables I 28, I96 and 266 projecting into the drum through the bottom wall thereof, and the wires thereof connected to the terminals .280 of resilient contact wipers 282 in number equal to the number of wires in the three cables. These wipers may project from the circumference of the drum 218 and each engages a companion slip ring 284 carried by an insulating sleeve 286 mounted in the explosion proof housing, concentrically with the drum 218, and rotatable about the drum as the turret rotates. These slip rings 284 may be connected by suitable terminal screws or other fastenings to the wires of cables 288, 280 and 292 respectively, connecting the cables I 28, I96 and 266 to the alternating current Selsyn receiver I26, the price variator I98 and the induction motor I54.

Thus it will be clear that the electrical connections, previously described, to the register driving motors and control means is maintained during the rotation of the turret and that accordingly the turret may be swung to any desired position to properly position the dials of the single face registering means for viewing by the purchaser and the attendant, and this regardless of the position in which the automoile is driven up to the pump stand.

It will be further clear that inadvertent or intentional rotation of the turret during the dispensing operation will in nowise affect the accuracy of the registration.

In the form of the invention shown in Figures 19 to 12, the switch rod operated by the nozzle switch lever is formed in two parts, 294 and 296, joined by a lost motion connection 298 comprising, as illustrated, a sleeve 300 fixed to the part 254 and slidably receiving the enlarged end of the part 296. A spring 302 holds the parts normall in the position shown in Figure 10. When closure of the nozzle switch 42 is prevented by the latch member 48, the operation of the lever 38, as on initiation of a dispensing 2,511.,ooe

operation, causes the-part 294. to move down-.- wardl'y and the sleeve 3flfl to'sl'ide' over the rod 296 against the action ofv the spring 39 1 In sodoing, the. sleeve engages and depresse .the switch operating collar 304 against its spring. 3135'; The rod 308 carried by the collardepresses the operating plunger of the Micro switch 3m mounted in a switch housing carried by the part 2%. The switch 311 controls a circuit which includes a solenoid 3l2 of a solenoid operatedreset switch 314 having switch contacts 316,

- 818 and 320 connected in the circuits of the rewind, motor. llllf'and' the clutches l'4'8 'and I24 in the same manner as the-switch contacts 2H,. 23B and 240' of the reset switch 216." The solenoid is energized througha circuit which extends from the line Ll, throughwire 21.0,. Wire 322, solenoid 3'I2,switch3ltl, wire 21.8,switch. [GB-of switch unit 162'for switch I06 of switch unit I and wire 22!] to supply line -2.

registering, means. On completion of the resetting, the solenoid. is deenergized by the open ing of the switches Hi6 and H36; the-switch contacts 31 6, 318 'and 328 then move to open position breaking the rewind motor circuits and further opening the circuits to-the clutches I48 and I24.

Obviously the invention is not limited to the specific detailsof construction disclosed herein but is capable of other modifications andchanges without departing. from the spirit and scopeof' the. appended claims.

I claim:

1-. In a liquidfuel dispensing. system, the combination of a flow linethrough .which: liquid fuel. is. adapted to. flowunder pressure, a liquid displacement. meter. in said line,.. a-cost register, electric. motor-clutch. means driving, said cost. register, adjustablespeed controlmeans actuated. by the meter. and connected to. said motor-clutch means for...causin'g..said clutch means to drive said. costregisterin proportionto the movements of the meterat ratios. adjustable in. accordance with .the unit price of. the. liquid dispensed}:

2.'In a. liquid fuel. dispensing system, thecom bination of a. flow line through whiclrliquid fuel is adapted to flow under pressure, a liquid. displacement meter in said line, .a cost register, electrical driving means including an electrically operable eddy current clutch. for driving said costregister, electrically operable and adjustable speed controlmea-ns-actuated by the meter andLconnected tosaid eddy current clutchimeans for causing. saidcost registerto be-driven by said driving. means in proportion to the movements of. the. meter at ratiosadjustable inac cordance with changes in the unitpriceof. the liquid dispensed.

3'.' In a liquid fuel. dispensing system, the combination of aflow "line through which liquid fuel is adapted .to how under pressure; a liquid displacement meter in. said line, a cost register,

a volume register, electrical driving means including an: electrically operable clutch for drivingsaid. cost register, electrically operable and adjustablespeedcontrol means actuated. by the meterand connected to said clutch for causing said cost register to be driven bysaid driving means in proportion to the movements of the meter. at. ratios adjustable in accordance with the: changes in the unit. price of the liquid dispensed,. and an. electrical follow-up comprising a. position. transmitter: actuated by the meter, awpositionreceiver electrically connected tosaid The solenoid 312 is thus energized to cause resetting of the transmitter and mechanicallyconnected. to said volume register for driving saidregister in. positional synchronism with'said meter.

4.. In a liquid. fuel dispensing system, the. combination of. a flow line. through which liquid fuel isadapted to flow under pressure,- a liquid displacement meter in said line, a cost register, a volume register, electrical driving means including auelectrically operableclutchfor driving said. cost registen. electrically operable and" adjustable speed controlmeans actuated by the meter and connected: to saidclutchior causing said. cost register to be driven by saiddriving means: in. proportion tothe movementsof the meter at: ratios. adjustable in accordance with the changes inthe-unit price of the liquid dispensed, electrical driving means for the volume register, and electricpower supplying means actuated by the meter and connected to saidlast mentioned driving. means.

5.. In a liquid fuel dispensingsystem, the combination of. a flow line-through. which liquid fuel isadapted-toflownnder pressure, a liquiddis. placement meter in said line, a cost register, a volume register, electrical driving means including an electrically operable clutch for driving said. cost register, electrically operable and adjustable speed control means actuated by the meter and connected to said clutch for causing said cost. register to be driven by said driving meansin proportion to the movements of the meter at ratios adjustable in-accordance with the-changes in.the unit price of the liquid dispensed, and electrical drivingmeans for the volume register,. and means controlled by the meter for powering. the same.

6,- Ina liquid fuel dispensingsystem, the-combination of a flow line through which liquid fuel is adapted to flowunder pressure, a liquid displacement meter in. said line, a cost register, a:

volume register, electrical driving means including an electrically operable clutch for driving said cost. register adjustable speed control, electrically operable means actuated by the meter and con-. nected to said clutch forcausing saidcost register to be drivenby said driving means in proportion to the movementsof the meter at ratios adjustable in accordance with the changes in the unit price of the liquid dispensed, andan electric follow-up drive for said. volume register and actuated by the meter.

'7. In a liquid fuel dispensing. system, the combination :of a flow line through which liquid fuel is adapted to flow under pressure, a liquid dis placement meter in said line, a cost register,.a volume register, electric motor means independent of the meter for driving the cost register, electrically operable speed control means actuated by the meter for varying the rate at which the cost register is driven by said motor to accord with the rate of movement of the meter, anelectric motor for driving the volume register, electric power supply means for said motor and driven by the meter.

8. In a liquid fuel dispensing system, the combination of a flow line through which liquid fuel is adapted to flow under pressure, a liquid displacement meter in said line, .a housing enclosing a portion of said dispensing line and said meter, a turret turnable with respect to said housing, registering means in said turret, electrically operable driving means for said registering means and mounted in said turret, electric power supply means. in said housing, electric control means in saidlhousing, and actuatedby. the meter, and v means for connecting said power supply means and said electric control means in said housing to said electrically operable driving means in said turret, said connecting means including relatively rotatable contact members one secured to the housing and the other to said turret.

9. In liquid dispensing apparatus, a flow line, a meter in said line and operated by the fiow of liquid therethrough, registering means comprising a roll of film marked with dispensing indicia, film projection means, a projection screen upon which said indicia is projected by said projection means from said film, film feeding means controlled by the meter, electrically operable means for re-winding said film on said supply roll to reset said registering means and electrically operable means controlled by the film for preventing flow of liquid through said line during rewinding of the film.

10. In liquid dispensing apparatus, a flow line, a dispensing valve in said line, a meter in said line and operated by the fiow of liquid therethrough, registering means comprising a roll of film marked with dispensing indicia, film projection means, a projection screen upon which said indicia is projected by said projection means from said film, film feeding means controlled by the meter, electric motor means for re-winding said film on said supply roll to reset said registering means to zeroized position between successive dispensing operations of said valve, and automatic means operated by the film for rendering said re-winding means inefiective when said film reaches zeroizecl position.

11. In liquid dispensing apparatus, a source of liquid supply, a dispensing line connected to said source, a dispensing valve in said line, means for causing a flow of liquid through said line from said source upon the opening of the valve, a, meter in said line and operated by the fiow of liquid therethrough, registering means, means controlled by the meter for driving said registering means in proportion to the movements of the meter, an electric motor for driving said flow-causing means, said dispensing line includ% ing a flexible hose having a dispensing nozzle in which said valve is located, a support for said nozzle when not in use, means for initiating operation of said motor upon removal of the nozzle from said support, and electrically operable register resetting means operable upon removal of the nozzle from said support and controlling said motor initiating means to prevent operation of the motor until the registering means have been reset.

12. In a liquid dispensing apparatus, a, flow line, a meter in said line and operated by the flow of liquid therethrough, registering means comprising two rolls of film, oneoi' which is marked with volume indicia and the other with cost indicia, film projection means, a projection screen upon which the indicia on both said films is simultaneously projected by said projection means from both said films, a follow-up comprising an electrical position transmitter driven by the meter and a osition receiver driving the film containing the volume indicia, variable speed electric motor means for driving the film containing the cost indicia, electric generator means connected to the meter and to said motor means for controlling the speed of said motor means, an electrical price variator in the connection between said generator means and said motor means for adjusting the speed ratio between the motor means and the generator means in accordance with unit price of liquid to be dispensed, electric motor means common to both said films for rewinding said films, electric clutches, one for each of said films for individually connecting and disconnecting said rewinding motor means from the films, and a control associated with each film for rendering the clutch associated with that film effective to disconnect the rewinding motor from the film when the film on rewinding reaches zeroized position.

13. In a liquid dispensing apparatus, a dispensing line, a pump in said line causing a flow of liquid through said line, a meter in said line operated by the flow of liquid therethrough, an electric motor for driving said pump, registering means, means controlled by the meter for driving said registering means in proportion to the movements of the meter, said dispensing line including a flexible hose having a dispensing nozzle, a support for said nozzle when not in use, electrically operable register resetting means, means operable upon removal of the nozzle from said support for initiating operation of said register resetting means, and electrically operable means controlled by the registering means for automatically initiating operation of said motor when the registering means have been reset.

CURTIS F. PRANGLEY.

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

UNITED STATES PATENTS Number Name Date 1,922,071 Bassett Aug. 15, 1933 2,060,674 Hicks Nov. 10, 1936 2,151,239 Slye et al Mar. 21, 1939 2,173,477 Goss Sept. 19, 1939 2,176,827 Walker Oct. 17, 1939 2,209,700 Mayo July 30, 1940 2,213,278 Hazard Sept. 3, 1940 2,229,370 Carroll Jan. 21, 1941 2,289,003 Faso July 7, 1942 2,289,330 Fischer et a1. July 7, 1942 2,307,085 Trexler Jan. 5, 1943 2,309,332 Tancred Jan. 26, 1943 2,319,867 Johnsen May 25, 1943 2,364,138 Grise Dec. 5, 1944 Certificate of Correction Patent N 0. 2,511,006 June 13, 1950 CURTIS F. PRANGLEY It is hereby certified that error appears in the printed specification of the above numbered patent reopuirirg correction as follows:

Column 4, line 48, for curent read current; column 12, lines 13 and 44, for adjustable speed control, electrically operable read electrically operable and adjustable speed control and that the said Letters Patent should be read as corrected above, so that the same may conform to the record of the case in the Patent Office. Signed and sealed this 9th day of January, A. D. 1951.

THOMAS F. MURPHY,

Assistant Commissioner of Patents.

Certificate of Correction Patent No. 2,511,006 June 13, 1950 CURTIS F. PRANGLEY It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows:

Column 4, line 48, for curent read current; column 12, lines 43 and 44, for adjustable speed control, electrically operable read electrically operable and adjustable speed control,;

and that the said Letters Patent should be read as corrected above, so that the same may conform to the record of the case in the Patent Oflice. Signed and sealed this 9th day of January, A. D. 1951.

THOMAS F. MURPHY,

Assistant Commissioner of Patents.

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