US2595259A - Resetting mechanism for gasoline dispensing pumps - Google Patents

Description

,May 6, 1952 R. H. HILL ET AL 2,595,259

RESETTING MECHANISM FOR GASOLINE DISPENSING PUMPS Filed Feb. 28, 1947 7 Sheets-Sheet 1 INVENTORS y 6, 1952 R. H. HILL ET AL 2,595,259

RESETTING MECHANISM FOR GASOLINE DISPENSING PUMPS Filed Feb. 28, 1947 7 Sheets-Sheet 2 Q 5 & S

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m 3 M? i l 3 NJ s m =1 g Q 3 S i w WL- a m lllllll u N j: 1 a g Q v \r 1 INVENTORS m k g 4 Wm ,fli lw gm y 6, 1952 R. H. HILL ET AL 2,595,259

RESETTING MECHANISM FOR GASOLINE DISPENSING PUMPS y 1952 R. H. HlLL ET AL 2,595,259

RESETTING MECHANISM FOR GASOLINE DISPENSING PUMPS Filed Feb. 28, 1947 7 Sheets-Sheet 4 May 6, 1952 2,595,259

RESETTING MECHANISM FOR GASOLINE DISPENSING PUMPS Filed Feb. 28, 1947 R. H. HILL ETAL '7 Sheets-Sheet 5 INVENTORS @erffl. Jardeie z/g May 6, 1952 R. H. HILL ET AL ,595,

RESETTING MECHANISM FOR GASOLINE DISPENSING PUMPS Filed Feb. 28, 1947 7 Sheets-Sheet e INVENTORS May 6, 1952 2,595,259

RESEITTING MECHANISM FOR GASOLINE DISPENSING PUMPS Filed Feb. 28, 1947 R. H. HlLL ET AL 7 Sheets-Sheet 7 J7 3w 3J0 L 2 247 656 ZZZ /ZZ w QXMM Patented May 6, 1952 RESETTIN G MECHANISM FOR GASOLINE DISPENSING PUMPS Robert H. Hill and Burdette W.

Ind., Company, Indiana assignors to Tokheim Oil Foss, Fort Wayne, Tank and Pump Fort Wayne, Ind., a corporation of Application February 28, 1947, Serial No. 731,636

28 Claims. l This invention relates to reset mechanisms for resetting the computer head of a so-called computing device and more particularly to a gasoline pump of the computer type.

Among the objects of the present invention is to provide an hydraulic mechanism operated by the pressure in the dispensing line for automatically actuating the reset mechanism prior to the initiation of the dispensing operation and operable from the pressure of the pump which causes the dispensing flow and whereby the hydraulic pressure'may be utilized to control the speed of the resetting mechanism whereby to avoid injury to such mechanism.

Yet another object of the invention is to provide an hydraulic mechanism for resetting the computer mechanism wherein means is provided whereby to prevent a false registration of the computer mechanism.

Yet another object of the invention resides in providing hydraulic reset mechanism for the computer head including means which will permit the pump motor switch lever being thrown to a position to stop the pump but which will prevent the switch from being thrown again to a second on position until the reset mechanism has been restored to an original initial position from which resetting starts, thereby precluding false registration of the numeral wheels.

Yet another object of the invention resides in providing mechanism associated with the switch for the pump motor constructed and arranged so that if the pump motor switch is once thrown to the pump ofi position, the reset mechanism must complete its cycle of operations before such pump motor switch can again be turned to a pump on position.

Yet another object of the invention resides in providing, in an hydraulic reset mechanism for a computer head, means for preventing partial actuation of the shutter mechanism or of the reset mechanism due to momentary failure of the power line'or due to the momentary passage of relatively large volumes of air through the air separator such as would cause such a material reduction of pressure in the dispensing line to affect the hydraulic reset mechanism.

Yet another object of the invention resides in providing means controlled by the on position of the motor pump switch lever for precluding movement of the hydraulic reset mechanism away from dispensing position due to the momentary passage of air through the air separator or the momentary failure of the electrical system.

Yetanother object of the present invention resides in providing an hydraulic reset mechanism for a gasoline computer pump possessing all of the advantages of the foregoing.

Another object of the invention is to provide a resetting device which will reset the computer at a fixed constant speed.

Another object of the invention resides in providing a resetting device which will prevent the operation of the resetting mechanism during any discharge of liquid from the dispensing nozzle.

These and other objects of the invention will be apparent from a perusal of the following specification when taken in connection with the accompanying drawings, wherein:

Figure 1 is a view of a gasoline computer pump provided with the instant invention;

Figure 2 is a schematic view of the flow lines of the pump and incorporating parts of the present invention;

Figure 3 is a diagrammatic representation of the hydraulic reset mechanism which includes the air separator or air release mechanism of the Bechtold Patent 1,868,444, issued July 19, 1932, the details of the valve mechanismbeing more specifically shown in Figure 6 of the drawings;

Figure 4 represents the same diagrammatic view showing the motor pump switch lever thrown to the on position, the resetting operation having taken place and dispensing in operation;

Figure 5 is a corresponding view of the parts showing the hydraulic reset mechanism returning to normal position and the motor pump switch lever in off position;

Figure 6 is a detail view of the valve construction showing the air release mechanism of the aforesaid Bechtold patent, and also shown in the Foss Patent 2,289,003, issued July 7, 1942 Figure '7 is a view of the torque responsive clutch showing the position of parts before the pump is started;

Figure 8 is a view of the same showing the position of the parts after the pump is started and the reset shaft turned one and one eighth of a revolution;

a Figure 9 is a view showing the position of the parts an instant after the completion of one and one eighth revolution;

Figure 10 is a view showing the position of the parts an instant after the cam is released; I

Figure 11 is a sectional view of the torque responsive clutch taken onthe line II--l of Figure 7;

Figure 12 is anexploded view showing the various parts of the torque responsive clutch;

Figure 13 is a view, similar to Figure 4, but

incorporating additional safety structures for insuring proper operation of the parts;

Figure 14 shows a view of a modified or commercial form of the hydraulic reset mechanism;

Figure is an enlarged view of the hydraulic cylinder and its piston and rack and the reset latching mechanism;

Figure 16 is a section on the line 15-45 of Figure 14 showing the details of construction of the improved clutch; and

Figure 1? is a section on line l'i-il of Figure 16.

In the present commercial type of gasoline computer pump t he computer mechanism, which is of the well known Veeder-Root type, requires a manual one and one eighth forward turn to complete the resetting operation. This forward turn is followed by a one eighth turn in the reverse direction for the purpose of raising the shutters which mask the numeral wheels during the resetting operation. The one eighth reverse turn for clearing the shutters from the numeral wheels is actuated by spring means in the computer itself andv this reverse turn occurs at the termination of the forward one and one eighth turn andis occasioned by the computing mechanism coming against a positive stop, which is then fol'lowedby the aforesaid reverse turn. One or all of the following patents owned by Veeder- Root, Incorporated, of Hartford, Connecticut, discloses the particular type of mechanism herein set forth: Slye 2,264,557, of December 2, 1941; Wild 2,274,115, of February 24, 1942; Slye 2,282,- 678, of May 1 2, 1942. In addition, it is to be noted that this type of Veeder-Root computing mechanism has been in commercial use and sale in practically all of the computer type pumps now in use in the United States. They are made by Veeder-Root,Incorporated, of Hartford, Connecticut, and are known as computer pumps, and the computing mechanism is constructed and opcrates in accordance with the disclosure of this application. Furthermore they are described in repair part manuals of Veeder-Root, Incorporated and also of many of the gasoline pump manufacturers, including The Wayne Pump Company, S;. F. Bowser & Company, Incorporated, The TokheimOil Tank and Pump Company, of FortWayne, Indiana, the Erie Company, of Erie, Pennsylvania, and many others too numerous to mention. In short, the construction and operation of this type of computer is well known to those skilled in the art.

Referring now to the drawingsin detail, in Figure 1 there isshown a more or less conventional type oidispensing pump preferably of the computer type which is adapted not only to compute the volume but also the price. The invention is. equally adaptable to any type of volume and/or price indicating pump wherein indicating or registering mechanism is synchronically operated in accordance with the liquid flow through the metering. or liquid. measuring mechanism. In the present instance, the computing mechanism is shown as positively driven by the meter shaft, but other adaptations. are within the contemplation of this invention.

Referring now to Figure 1, the invention shows the usual type of angle iron frame or skeleton upright .I whichsupports the conventional type of housing 2- and within which housing is positioned the other internal unitsof the pump such as the electric motor 3 driving the pump 4 through suitable gearing such as the belt 5. The pump 4 is adapted'todraw gasolinefroma supply tank,

upwardly through the pipe 5 forming a part of the dispensing line, into the suction chamber 1 and an air separator or air release mechanism shown particularly in Figure 3. In the present instance, the air separator is of the type preferably as shown in a patent to Bechtold, No. 1,868,- 444, patented July 19, 1932, comprising a housing or other casing having internal partitions. The pump has an inlet chamber or suction chamber 1 connected with the pipe 6 and connecting with a preferably cylindrical screen 8 through which the entering gasoline flows on its way to the pump 4. The pump is shown preferably asin internal gear type but any type of pump may be utilized. The gasoline is discharged from the port If! into a separation chamber H which is adapted to separate air and/or vapor from the gasoline, discharging the air and/or vapor to atmosphere while passing the gasoline to and through the dispensing line. In the air separator any air entering the chamber H will necessarily rise to the top and pass through the small orifice [2 into the superior float chamber [3. If no air be present, a small amount of gasoline will pass through this orifice l2 when the pump is running,

' but if or when the amount of gasoline. in the chamber l3 rises to such a level as to raise the, float I4, this in turn, opens the valvev 15. This additional flow of liquid is thus returned to the suction side of the pump 4 by means of the conduit l6. The float chamber I3 is preferably covered by a metal dome I"! to which in the present invention are connected two tubes l8 and I9. Tube l9 serves as a constantly open vent to the atmosphere. This tube passes upwardly and out through the housing 2, as shown in Figure 1. Thus the float chamber I3 is always under normal atmospheric pressure.

Tube I8, which is not disclosed in the prior Bechtold patent, leads to the upper end of; acylinder 26 hereinafter more fully described in detail.

As in accordance with the prior Bechtold patent, and as shown in detailin Figurefi of the present drawings, the separation chamber II' is pr vided with two pressure operated valves 21. and 22 normally held closed by springs 23 and 24 respectively. Valve 22 is known as the by-pass valve, while valve 2| is a, regulating valve. I the dividing partition25 which divides the pressure chamber from. the float chamber, there are provided two openings. adapted to receive. cylinders 26. The upper ends of these cylindershave, an annular flange 2'! which fits into a counterbore in the casting. On top of these, flanges are covers 28 which are clamped thereon by the, bar 29 and screws 30. In the center of these cylinder covers 28 is a dome-like portion 31 apertured centrally as at 32. The bar clamp 29 is provided with holes 33 which register with the vent holes 32 whereby to allow the. upper ends of these cylinders, 26 to bev open to atmospheric. pressure. through the gasoline, inthe floatchamber'lirand the atmospheric-vent tube [9. Withineachcyh inder 28 is a piston 34 securedto valve'rods. 3.5. and. 36.

for holding the valves closed until sumcient pres-- sure is created in the separation chamber H by the pump whereby to-act upon thepistons'fl On the. lower-ends of the-cylinders 2B, are spring retainer disks 3! having; a, large,

and open the valves against their springs. Below the valve 22 is a by-pass duct 38 which opens into'the suction chamber 1. Below the valve 2| is a duct 39 the top of which is attached to a pipe 40 constituting a part of the dispensing line and leading in the inlet side of the meter 4I. Attached to the side of the separator chamber H is another tube 42 the other end of which is attached to the bottom of the cylinder 20 of the resetting device.

From the outlet side of the meter, the dispensing line 43 flows through a liquid flow gauge 45 and from thence the gasoline passes through the usual type of flexible hose 46 mounted on the outside of the housing or casing 2. This hose 46 is provided with the conventional type of nozzle valve 4'3. The meter 4| drives the computer 49 by means of the drive shaft coupling 56. The computer may be of the conventional type used today or may be just a simple type of counter. For this discussion, the mechanism is devised for resettin the type of computer generally known as a Veeder-Root, manufactured by Veeder-Root, Incorporated of Hartford, Connecticut. On this type of computer the reset shaft 5| does not rotate when the computer is being driven. To reset, the shaft must be turned 405 degrees counterclockwise, looking at the computer from the hose side, as viewed in Figure 3, and it will then rock back 45 degrees.

By reference to Figures 1, 2 and 3, the cylinder 28 shown in Figure 3 is suitably mounted on the support frame I of the pump. This cylinder 20 is provided at its upper end with a relatively long bearing 52 in which rotates a pinion shaft 1'.

54. The opposite wall of the cylinder 26 is provided with an elongated sleeve-like portion 56 for purposes hereinafter recited, and the top of the cylinder 26 is provided with a longitudinal housing or guideway 58 to accommodate the uppermost position of a rack about to be described.

The pinion shaft 54 is provided on its inner end with a pinion 66 adapted to mesh with an elongated rack 62 normally disposed within the cylinder and carryin at its lower end a piston 66. A coil spring 68 normally confined between the upper end of the cylinder 20 and the top side of the piston 66 normally serves to force the piston down to the position shown in Figure 3. The interior of the cylinder 20 is provided with a guideway 18 to the rack. The top 72 of the rack, as shown more clearly in Figure 5, is provided with a bevelled surface 14 for cooperation with a preferably round nose 16 of a plunger 78 which has a collar 88 confining a spring 82 between it and the shoulder 84 of the bearing sleeve-like portion 56 whereby the plunger I8 is normally pressed toward the rack to maintain the rounded nose portion I6 in contact with the rack. The hollowed outer end 86 of the plunger i8 is provided with a second plunger the stem 88 of which is normally projected outwardly by means of a second coil spring 90. A threaded thimble 92 closes the end of the plunger 18 about the shank 88. The inner end of the shank is provided with a head which is adapted to compress the spring 98 in the bored portion of the plunger 18. The outer end of the shank 88 is provided with a preferably squared end forming a, latch to cooperate with a shoulder portion 94 on the inner rounded end 96 of the switch lever 88 which is pivoted at I80. The upper end of this switch lever may be formed preferably in any well known manner to receive thereon the hose nozzle which is of customary construction. The usual port associated with the switch lever, as is well known in the art. The hose nozzle 41, it will be understood, is provided with the customary valve 4Ia and the valve actuating member 47b.

Associated with the liquid dispensing line 43 coming from the meter 4| is a fitting which connects as at 97 with that port of the dispensing line 43 into which the meter 4| discharges. This fitting has a lower portion providing a bear- 7 ing Isl with a valve seat I62 and an outlet pipe I84 which connects with that portion of the dispensing line 43 that is beyond the usual type of sight glass 45. In addition the fitting is provided with a delivery valve I06 adapted to be urged onto the valve seat I82 by a coil spring I88. The valve I66 has a stem III] which slides in an aperture in the bearing IOI. The hearing is shown as being at the upper portion of the elongated guideway 58 in which the rack 62 reciprocates. I66 is in the dispensing line and is normally closed on the valve seat I02.

A torque responsive clutch mechanism H2 is located between the pinion shaft 54 and the computer reset shaft 5I, as shown clearly in Figure 3, and its function is to provide a driving agency between the hydraulically actuated pinion shaft 54 and the reset shaft 5| of the computer. The present type of computer which rotates 405 degrees forwardly to reset the numeral wheels of 'the computer and then 45 degrees rearwardly to remove the shutters from the reset numerals, requires a type of clutch which will permit this. In addition, the clutch must be constructed and arranged to permit the rack 62 of the hydraulically actuated mechanism which gears with the pinion 68 to move downwardly its full length stroke after the upward full length stroke of the rack which is the actual reset portion of the movement of the rack. The downward stroke of the movement of the rack is a cocking or conditioning movement of the piston so as to put the reset mechanism in condition for a subsequent operation. The torque responsive clutch, as shown in Figures 11 and 12 of the drawings, comprises an outer shell II 2 of generally cuplike construction, which shell has an axial integral hub II4 which is pinned as at II8 to the pinion shaft 54. The shell H2 is provided with a slot I20 in its annular rim and is likewise provided with an outstanding, radially extending lug I24. A torsion spring I26 through which the driving takes place has one end I28 which is anchored in the slot I20 of the shell and has an opposite inner end I 38 which is anchored as hereinafter described. The spring houses within the hollow shell II2. As shown in Figure 12, the lug I24 has a portion I25 that extends outwardly beyond the edge or mouthof the shell II2. A disk I32 is provided with a hub I34. The hub in turn is provided with a groove or slot I 36. The hub is adapted to surround the pinion shaft 54 and has a bearing thereon and rotates with respect thereto. The hub extends into the shell H2 and is housed thereby. The inner end I36 of thespring I26'is anchored in the slot I36 of the hub I34. The disk is provided with an offset. portion I38 to receive a pivot pin I40 which pivots a trigger I42 to the disk. This trigger has an outwardly extending leg I44 whichleg isbent at right angles-to provide a portion out of It will thus be seen that the valve the plane of the trigger I42. opposite leg I48 of the trigger i42 projects normally outwardly beyond the periphery of the disk I32 being normally held in this position by meansof a coil spring 559- which is anchored to the outer end of the leg I44 and likewise to the disk I32. The disk I32 is also provided with a radially outstanding, substantially square ear I52 which cooperates with the lug I25 on the shell II 2. The trigger portion -48 also cooperates with the lug I24 on the shell I i2 during a certainpart of the driving operation. A second disk 454 is provided with an annular collar I55 extending from one face thereof. It is provided with an oppositely extending sleeve It] extending cen trally thereof. This sleeve IfiI is provided with diametrically disposed slots I62 for receiving driving pins !65 formed on the inner end I64 of a short shaft. This short shaft in turn in pro vided with a ball-like head I61 and oppositely extending pins I69 which engage in slots III on the end of the computer shaft 5|. ln addition, the sleeve It! is provided with a groove ISO to receive a spring H2 which engages in a grooved end N4 of the driving shaft 54. The computer reset shaft 51, as is well known, is adapted to be operated in one direction, preferably forwardly, to turn the numeral wheels to zero for the reset operation. This forward or clockwise turning of the reset shaft is to the extent of 405 degrees forwardly to reset the numeral'wheels and computer, and then the shaft, under spring action of. a spring in the computer itself, turns the reset shaft rearwardly 45 degrees to remove the shutters from the reset numerals, as is well known in the art. The clutch herein disclosed accomplishes this function. The second disk I54 is providedwith a cam surface I58 andan abrupt shoulder .iithereon. This camsurface I and the shoulder we are adapted to cooperate withthe upturned end M4 of the trigger mechanism i lt carried: by the first disk I32. The pinion drive shaft extends through this sleeves The groove il of the shaft 54- will lie opposite the slot so thatthe spring inserted in this slot will lie in the groove W4 of the shaft 54. r

Pivoted as at I'ifi" to the inner end 96 of the switch lever 98 is a switch rod I18, the inner end carrying a switch I80 which is adapted to make electrical contacts with the electrical. circuit of the motor 3 which drives the pump 4, ina well known manner. 7 v

By reference to Figure 3, the liquid drain pipe 58 connects to the top portionof the hydraulic cylinder 24. The opposite end of. this pipe I8 connects with the float chamber I3. v

In the operation of the entiremechanism, as-

suming that due to a previous op'erationof the computing dispensing pump the numeralwheelshave stopped at 5 gallons and the corresponding total cost wheels of the computer have-stopped-at $1.00, which would be the total cost of 5 gallons at 20c per gallon, when it is desired to makea second and subsequent dispensing. the operator takes the nozzle 4'7 from the hook and manually raises the switch lever 98-. Prior to raising the will be completely downward because'boththe top and bottom of the piston are at-a-tmosphericpressure when the pump is idle, thereby allowing the spring 68 to push the piston downward to the bottommost position, as shown in F-igure'g.

At this time the nozzle valve is closed and the valve I96 is closed, and the two" valves" 2I and 22' In addition, the

are closed, as stated. The operator then removes the nozzle from its hook and raises the switch lever 98'to the "011 position of the pump, as shown in Figure 4. This immediately, through the rod I78, closes the switch and starts the pump motor to start the pump 4. Pressure in the chamber II is immediately created. The spring of valve 2I is set for approximately I0 pounds. The spring of the by-pass valve 22 is set for 20 pounds. The spring 68 on the hydraulic piston cylinder chamber 20 is set for less than 20 pounds. The spring I58 is set for more than 22 pounds. As soon as the pump is started, the rack 62- is raised and in so raising the rack will turn the pinion 69 on the shaft 54. Figure 7 of the draw} ings shows the position of the parts of the clutch before the pump is started. Figure 8 shows the position of. the parts after the pump has been started, and shows the reset shaft 5| turning forwardly or clockwise one and one eighth revolutions. During the turning of the reset shaft the first one eighth of a turn, the spring in the computer is energized. The turning of the reset shaft by the turning of thedrive shaft 54 is ac complished in the following way. As a result of the pressure created in the chamber II liquid will be forced through the pipe 42 into the hydraulic cylinder 29 to raise the piston 56 against the tension of the spring 68.- (This will force the rack upwardly and push the plunger 18 outward- 1y so that its outer end contacts the rounded periphery of the cam 96 as shown in Figure 4.) As the rack 62 moves upwardly the pinion 68 isrotated torotate the shaft 54. Assoon as the pump is started during theraising of the rack, the shell IIZ, being connected to the shaft 54, will be rotated in a clockwise direction. This shell [I2 is connected as at I28 with the outerend ofthe spring I26, and the inner end I30 of the spring is connected to the collar I34 of the disk I32 by means of the slot I36, see Figure 12. This spring then acts as a driver for rotating the disk I 32 in a forward, clockwise direction. The'disk I32 thus rotating forwardly will carry the trigger mechanism I48 in a forward, clockwise manner around with it, and since the toe I44 of this trigger is engaging the shoulder I10 of the disk I54, this latter disk I54 will likewise be turned in a forward, clockwise direction. It will be remembered that the spring I59 maintains this toe in contact with the shoulder I10. This second disk- I54, being connected by means of the slot I62 and" the pins I66, pins I69 and slot I'II' of the shaft5I, will turn likewise to drive the reset shaft 5I forwardly in aclockwise direction. After one i the end I48 of the trigger mechanism to'push the same about its pivot I in a clockwise direction toshift the toe I44 of the trigger mechanism away from the shoulder I?!) of the disk I54, thereby to break the driving connection between the driven disk I 32 and the driven disk I54. This position is indicated in Figure 9 where the toe I44 is just leaving the shoulder I'IEI. As soon as this release occurs, thedisk I 54'wi1l rotate backwardly in a counterclockwise direction degrees to re- -movetheshuttersfrom the-reset numerals This backward movement is caused by the spring in the computer mechanism itself, which spring is present in practically all standard types of computers, such for instance as the computers now manufactured by Veeder-Root, Incorporated, and in use on practically all types of computer pumps, such for instance as those manufactured by The Wayne Pump Company, Tokheim Oil Tank and Pump Company, and Gilbert & Barker Manufacturing Company. The return of this disk I54 is shown in Figure 10. Simultaneously with the return of this disk I54 the toe I52 on the disk I32, still moving forwardly clockwise, contacts the lug I24 of the shell, due to the action of the spring I26.

Referring to the foregoing cycle of operations, it is to be noticed that during the preliminary rotation of the reset shaft 5| the first action is to move the shutters over the numeral wheels and thereafter to shift the numeral wheels toward zero setting. As the rack continues to rise, the resetting will continue to the position where the upper end of the rack reaches the line A in Figure 4 of the drawings. This latter position of the rack corresponds to the completion of the resetting operation by the computer mechanism of the computer itself and corresponds-to a situation where a portion of the operative mechanism of the computer contacts the movable stop. That is, when the computer shaft comes to the 10 line 40-43 due to the fact that the nozzle valve 41a is still unopened. As soon as the nozzle valve 41a is opened, dispensing flow will immediately take place under the influence of the rotating pump 4, and the Valve H16 will thus be held open by rack 62 to permit this. Immediately upon the completion of that particular dispensing operation the operator will then return the switch lever 93 to the down or off position to stop the pump, see Figure 5. Immediately the pressure in the chamber II drops, and this drop correspondingly reduces the pressure in the hydraulic cylinder 20. When the pressure gets low enough, the spring 68. will start forcing the piston 66 down. This will cary the rackdown so that when the top of the rack descends to point A (see Figure 4) the valve l 66 will close under the action of the spring I08. As shown in Figure 5, the rack continues to descend to recock or recondition the reset mechanism for the next dispensing and its subsequently following reset operation. As long as the rack is in an upward position the blunt nose of the plunger 18 will bear or slide against the side of the rack tmmaintain the latch 88 against the rounded side 96 of the switch 98. However, when I the switch arm is lowered, this shoulder 54 will end of its rotating reset motion, it engages a stop within the computer proper. This creates excessive torque on the computer reset shaft which in turn moves lug IZ I away from the ear I52 (Figure 9), thereby engaging the upper arm I 43 of the trigger and disengaging the trigger from the cam I54 to break the drive between the disk I32 and the disk I54. During the rotation of the reset shaft, that is, during at least one eighth of the reset revolution of the computer, a torque spring in the computer is energized so that at the conclusion of the reset operation when the reset mechanism strikes the stop and the driving connection between the disks I54 and I32 is broken,

this energized spring then comes into action so that when in position corresponding tothe top of the rack reaching the line A, the spring reverses the reset operation one eighth of a turn, whereby to remove the shutters from the now reset counter wheels. This action takes place after the disengaged position is reached, just as the parts move beyond the position shown in Figure 9, so that the tang I44 is free of the shoulder I19 and thereafter rides upon the smooth portion 1689f the cam disk i5 3. By this time, the rack has continued on up to the position shown at B in Figure 4 where the tip of the rack strikes the shank of the valve I66 and opens it against the pressure of the spring I08. This position is shown in Figure 4. This valve let, which constitutes, a delivery valve or a valve controlling the flow of dispensing fluid in the delivery line, is thus held in open position as long as the resetting piston is held in its topmost position, as shown in Figure 4. At this time no dispensing occurs because the nozzle valve is not open. As the pressure in the chamber i I continues to build up, and when twenty pounds pressure has been reached the by-pass valve 22 will open to permit the liquid to by-pass around the pump, as is well known in the art. Erior to this, to-wit, at ten pounds pressure, the valve 2| has been opened by the pressure occurring against the underside of the piston of the valve as set forth in the prior patent to Bechtold, but no flow takes place through the flow be brought above the position of the latch so that the latch will then snap under it as shown in Figure 5, and thereafter it will be impossible to raise the switch 98 until the rack 62 has moved back to its lowermost position, as shown in Figure 3, which corresponds to the completion of the recock or reconditioning position of the reset mechanism. The reverse movement of the rack, which brings about a reverse rotation of the shaft 54, and hence a reverse rotation of the shell H2, is permitted since the pivoted trip I48 carried by the shell will revolve in an opposite direction, the tang I44 thereof moving in such a direction as to pass the shoulderedportion I16 of the disk I68 on the pinion shaft.

From the foregoing it will be apparent that one of the great advantages of the present construction of hydraulic automatic reset mechanism is that the speed of the reset mechanism can be controlled to whatever appears to be the most satisfactory speed; because the hydraulic reset mechanism provides a controlled and fixed pressure for actuating the piston which supplies the power for the reset mechanism. The rate of speed of reset can be controlled by controlling the size of the pipe 42. The speed of the cocking action is controlled by the strength of spring 68 and the size of the orifice I2 and size of pipe 42.

Furthermore, the present reset mechanism provides means for protecting the operator of the pump, or the owner of the pump, against dispensing any gasolineprior to the completion of the reset due to the fact that the valve I 05 cannot be opened until after the computer head'has I been completely reset, and further in view of the fact that it is controlled by the reset mechanism itself. In fact, in the present device the power has been disconnected from the computer before this valve can open. The latter part of the stroke of the rack which has been disconnected from the computer goes upward some distance after the line A is reached, before it fully opens the valve I06 at the line B. By reference to the drawings, the line A shows the point at which the reset rack 62 is disconnected from the computer through the clutch H2. Asthe nose I2 of the rack 62 passesbeyond the point A it contacts the lower end of the valve stem Ila-and begins to open the valve I06. From the point A to the 11 point B the valve I06 is opening and at the point B the valve I06 is sufficiently open. Hence until the rack reaves the point A, at which time the resetting has been completed and the rack disconnected, the valve I06 will not be opened to permit fiow through the line I04 and thus there is provided means for preventing the liquid from flowing through the dispensing line until the completion of the reset operation and until the reset shaft is disconnected by means of the clutch H2 from the computer.

In addition, means is also provided in the form of the shoulder 96 on the motor switch Q8 and its cooperative latch 88 for preventing the switch from being turned to off position and then turned on again immediately in an attempt to stop the computer in the middle of the reset operation. This means, herein shown in the form of the latch 88, prevents the motor or pump switch being turned to on position again after once being turned to "off position, until the reset mechanism has been returned to its normal position. Figure shows the position where the rack is descending and shows that the motor pump switch 98 is locked in oil position until the rack 62 completely descends to the position shown in Figure 3, which means that the operator cannot stop the resetting mechanism in the middle of a cocking cycle because if he did he could cause the computer to show a false reading. switch locking mechanism therefore precludes the operator from stopping the reset operation when half-way through, so that a dispensing operation for a subsequent purchaser would not start with the dials away from zero position, and hence the subsequent purchaser would not be deirauded and charged for more gasoline than he actually received. This mechanism prevents the operator from restarting the motor when the resetting rack is in a partially downward position due to the fact that the rack itself must go all the way down in order to permit the latch .to be pushed inwardly by a spring to escape the shoulder of the switch lever. This mechanism will ensure that the reset mechanism when once put into operation by the opening of the switch, and followed by the raising of the switch followed by the lowering of the switch to stop dispensing, must move through a full cycle before the switch can be thrown on again.

In the event that a type of computer is used wherein the reset shaft turns through two complete revolutions but has no partial backward travel, a simple type of overrunning clutch or a friction clutch may be used in place of the clutch H2.

In certain instances it is desirable to provide means interconnecting the switch leverand the rack for holding the rack in full raised position up to the point B where the valve I05 is maintained in open position during dispensing so as to preclude the partial lowering of the rack, as when a large amount of air passes through the air release chamber, or due to a momentary failure of the current in the line as distinguished from an opening of the switch lever 98. Such means is illustrated in Figure 13. This mechanism comprises a wedge-shaped abutment Isa formed on the side of the rack 62 and having an upper wedge-shaped face and providing a lower shoulder. In cooperation with this wedgeshaped abutment there is provided a second latch I86 passing through the desired portion of the wall 58, which second latch has a head manormally pressed by a spring I90 and confined with- The in a hollow plunger I92 on the end of a rod I95. This rod is pivoted at I96 to a bell crank lever I98 pivoted at 200 and pivotally connected as at 202 by means of an arm 2.04 to the switch arm 98' by means of the pivotal connection 2%, so that when the switch arm is raised the arm I95 will be pushed inwardly, tending to push against the side of the rack. When the rack is raised, and after arm 98 has been raised to pump on" position, the. upper surface of abutment its will ride past the latch I86, after which the latter will spring under the shoulder of the abutment whereby to maintain the rack in raised position until such time as the switch lever is thrown to the off position, which immediately withdraws the second latch I86 so that thereafter the rack 62 is free to descend. By thus holding the rack in raised position continuously during dispensing and until the switch lever 98 is restored to pump offpositiOn, a relatively large momentary volume of air passingthrough the chamber II even though it'causes a drop in the chamber and a drop in the pressure in the cylinder 29 will not permit the valve I06 to be closed under the force of .the spring I08. Hence the dispensing line will be kept open. Without this means, if the rack should drop adistance due to the decrease of pressure in the cylinder due in turn to a momentary large volume of air passing through the chamber II, the dispensing valve would close, and then when the air had passed and the pressure picked up again, the rack would move upwardly again away from its fallen position, and

this last raising movement of the rack would throw the shutters of the dials and partially turn the computer dials and the shutters would remain over the dials because the reset opera tion would not be completed. With the last described mechanism, however, this is impossible because the latching mechanism I86 will hold the rack in its elevated position and will hold the valve I66 open so that the rack cannot drop, and therefore will not drop and then raise again, and will therefore not throw the shutters over the numeral wheels or cause a false movement of the numeral wheels. The fact that the valve IE6 is held open during the momentary movement of a large volume of air through the air separator, is immaterial because the valve 2| of the air separator will close at this point and prevent any such air from getting into the dispensing line.

Referring now to the modification shown in Figure'lfi, only a portion of the structure shown in the prior figures is modified. The modifica tion relates to the construction of the hydraulic cylinder and its rack and the construction of the latching apparatus. In addition, a more simplified construction of clutch is shown. Referring to Figure 15, there is shown a preferably cast cylinder base 208 in which is seated the cylinder 2lIl. The upper end of this cylinder is closed by means of an elongated cylindrical cap 2E2 which at its upper end 2I4 is formed of smaller dimensions and terminates in a relatively long barrellike portion 2I6, extending considerably beyond the restricted portion 2I4 and connecting with a fitting 2I8 in which the valve Hi6 and its stem III! are mounted. The hydraulic piston 220 is attached to the bottom of the rack 222 in any suitable manner, as my means of the centralized screw 224 which confines the usual type or circular gasket 226 between the piston and the retaining plate 228. A coil spring 239 is confined between the inner face of the piston 229 and the shoulder 94 in Figure of the drawings.

upper end of the narrowed portion 2| 4 of the cap 2|2, the narrowed portion being provided with a shoulder to retain the upper end of the spring.

Mounted in the cap 2 I4 is the pinion shaft 232 on which is mounted the pinion 234. This pinion shaft 232 corresponds with the pinion shaft 54 of Figure 3, and the pinion 234 corresponds with the pinion 69 of Figure 3. This pinion 234 meshes with the teeth 236 of the rack 222. In addition, the upper end of the rack is provided with a narrowed. end 231 and an inclined shoulder 249, much like the upper end portion 12 of the rack 62 is formed in Figure 3. The top of the rack operates and reciprocates in the relatively small sleeve-like portion 2I6 and its upper portion is arranged to contact the lower end of the valve stem III) in the same way that the rack 62 contacts the valve stem H9 in Figure 3. So also the fitting or cap 2 I4 is provided with an enlarged, inwardly projecting wall portion 242 which is recessed as at 244 to receive a bushing 246. The bushing 246 forms a bearing for a head 248. The head 248 has a threaded internal bore to which is also threaded a sleeve 250 which has an outer bearing in a flanged ring 252 that is bolted as at 254 and 256 to the outer wall of the head 2| 4. The member'250 has a central opening through which reciprocates a latch pin 258 which has a rounded end 260. The other end of the latch pin 258 has a head 252 between which and the inner end of a bore 264 of the first head 248 is located a coil spring 266 which spring tends to force the head 262 of the latch pin 258 normally outwardly. In addition to the movement of the latch pin 258, the latch head 248 also has a movement in and out, toward and away from the line of reciprocation of the rack 222. To accomplish this, the head 248 is provided with an annular shoulder 268 which forms a seat against which a second coil springs 219 is confined. The opposite end of the coil spring is confined against the inner wall of the flange 252. Thus the spring 216 tends to normally force the head 248 inwardly against the rack bar while permitting the head to be moved outwardly by the inclined wall 249 of the rack bar. A spring finger 212 is mounted as at 214 on the cap 2M and has its inner ends pressing against the adjacent wall of the rack 222 whereby normally to keep the teeth of the rack resiliently in contact with the teeth of the pinion I Cooperating with the outer rounded end 269 of the rounded latch 253 is a second latch member 216. This latch is of sector-like conformation and is rigidly mounted on the shaft 218 which is adapted to turn. This shaft 218 corresponds to the shaft I09 on which the switch lever 98 is rigidly mounted so that when the lever is turned the shaft is likewise turned. Hence, when the hose nozzle is placed on the switch 98, as shown more particularly in Figure 5 of the drawings,

the lever 98 will be moved to a motor off or disconnected position, whereas when the switch lever 98 is raised, the motor will be placed in operative or motor on position. The switch latch 216 is provided with a depressed portion 289 which corresponds with the lower point of the cam 96 which is shown directly below the The other portion 282 of the latch is provided with a flat or higher surface so that as the latch sector 216 moves angularly with the shaft 218 either the low portion 289 or the higher portion 292 of the latch confronts the rounded end 26s of the latch pin 258. The action of this mechanism is other wise exactly like the action of the latch construction shown in Figures 1 to 5.

The modified clutch arrangement is shown particularly in Figures l4, l6 and 11. In Figure 17 the shaft 54 is shown at 284 as being rigidly connected to a collar 286 which in turn is rigidly welded or fixed to a shell-like housing 285. This housing has a punched-in ear 296 to which one end of a coil spring 292 is connected. In addition, the inner end 294 of the shaft 54 is loosely mounted in a hub 296 which is provided with an integral cam 298 and an outwardly extending driving shaft 399 provided with a slotted end 362 for engaging a universal connection with the computer reset shaft 5|, as is shown in the prior Figures 11 and 12. The housing 288 is provided with a rivet pin 394 which pivotally supports a latching dog 306 disposed within the housing. This latching dog carries at its outer end an anti-friction roller 358 and is provided at its outer end with a tongue or ear 3| 9 to which is attached the opposite end 3 I2 of the coil spring 292 heretofore referred to. In addition, the cam 298 is provided with a cam surface 3l4 which terminates in a shoulder 3! 6 which is adjacent a low point 3MB of the cam surface, the low point of the cam surface gradually increasing in the manner shown, up to the high point adjacent the shoulder 3I6. In the operation of this device, when the rack operated shaft 54 or 232 of Figure 15 is turned, upon actuation of the rack in an upward direction, as seen in Figure 15, the pinion will be turned counterclockwise as viewed in Figure 15, which in turn moves the housing 288 counterclockwise and through the pin 3G4 and the spring 292 causes the roller 398 to engage the shoulder 13"; of the cam, and the cam 298 will be turned counterclockwise in the same direction. This counterclockwise movement through this clutch mechanism will thus turn the shaft 399 counterclockwise to cause the reset shaft 5! to move in the same direction to cause the resetting of the computer. When the computer mechanism has reached its positive stop, as hereinbefore explained, in connection with Figures 1 to 5 inelusive and Figures 7 to 12 inclusive, the resistance set up will cause the roller 368 to disengage and move outwardly from the shoulder 3 I 5 thereby breaking or unclutching the driving connection which will permit the reset shaft to continue to turn while the computer has stopped. This breaking of the clutch connection permits the rack 222 to continue to move upwardly after the resetting has been completed so as to contact the lower end of the valve stem Hi! to open the valve I96.

Obviously the invention is not limited to the specific details of construction disclosed herein but is capable of other modifications and changes without departing from the spirit and scope of the appended claims.

Having thus described the invention, what is claimed as new and desired to be secured by Letters Patent is:

l. A liquid dispensing apparatus comprising a dispensing line adapted to be connected to a source of liquid supply, means for controlling the fiow of liquid through the dispensing line, register mechanism operable in accordance with the flow of liquid through the-dispensing line, resetting means for the register mechanism, control means for efiecting the operation of the register resetting means and the liquid flow control means, said control means including mechanism for operating the flow control means in predetermined timed relation to the operation of the register resetting means and including mechanism operable upon the actuation of the control means for efiecting the operation of the liquid flow control means'to cause the pressure of the liquid in the dispensing line to cause the complete automatic cyclic operation of the resetting means before the control means can be reoperated to cause a subsequent operation of the liquid flow control means.

,2. A liquid dispensing apparatus comprising a dispensing line adapted to be connected to a source of liquid supply, pumping means for forcing liquid through the dispensing line, means including a delivery valve for controlling the flow of liquid through the dispensing line, register mechanism operable in accordance with the flow of liquid through the dispensing line, resetting means for th registering mechanism, and control means for effecting the operation of the pumping means, the operation of the register resetting means, and the operation of the delivery valve, said control means including mechanism operable by pressure of liquid in the dispensing line for effecting the opening of the delivery valve at a predetermined time interval after the operation of the resetting means and for ensuring the completion of the operation of the resetting means prior to a subsequent operation of the pump operating means by said control means.

3. A liquid dispensing apparatus comprising a dispensing line adapted to be connected to a source of liquid supply, pumping means for forcing liquid through said dispensing line including a manually operable switch, means including a delivery valve in the dispensing line for controlling the flow of liquid through the dispensing line, said manually operable switch controlling said pumping means, register mechanism operable in accordance with the flow of liquid through the dispensing line, resetting means for the register mechanism, and common control means for effecting the operation of the register resetting means, and said delivery valve including mechanism operable by pressure of liquid in the dispensing line for efiecting the opening of the delivery valve a predetermined time interval after the operation of the register resetting means and for preventing a subsequent operation of the manually controlled switch until the completion of the operation of the resetting means.

i. A liquid dispensing apparatus comprising a dispensing line adapted to be connected to a source of liquid supply, pumping means for pumping liquid through said dispensing line, a motor for driving the pump and a switch operating mechanism for operating the motor, register mechanism operable in accordance with the flow of liquid through the dispensing line, resetting means for the registering mechanism, and control means interconnecting the switch operating mechanism and the resetting mechanism and actuated by pressure of liquid in the dispensing line for preventing the operation of the switch operating mechanism to restart the motor until the resetting mechanism has completed its cycle of operation.

5. A liquid dispensing apparatus comprising a dispensing line adapted to be connected to a source of liquid supply, means including a delivery valve for controlling the flow of liquid through the dispensing line, register mechanism operable in accordance with the flow of liquid through the dispensing line, resetting means for the register mechanism, a pump for forcing liquid through said dispensing line, a motor for the pump, a manually operated switch lever for the motor, an actuatable member adapted to move a predetermined distance upon the operation of the pump by said motor, means operated by the movement of said member for actuating the resetting mechanism and for subsequently opening the delivery valve, and means cooperating with the travel of said member and associated with the switch lever for preventing two consecutive operations of said switch lever unless the resetting mechanism has been completely operated by a predetermined movement of said member.

6. A liquid dispensing apparatus comprising a liquid dispensing line adapted to be connected to a source of liquid supply, a pump in said line.

a motor for driving the pump, a manually operated switch member for actuating said motor, means including a delivery valve for controlling the flow of liquid through the dispensing line, register mechanism operable in accordance with the flow of liquid through the dispensing line, a cylinder, a piston in the cylinder, connections from said cylinder to the liquid flow line to cause the operation of said piston upon the creation of a pressure in the flow line, a rack operated by the piston, means actuated by movement of the rack for operating the resetting mechanism, said rack upon a predetermined movement actuating said delivery valve, and a latchin device disposed in the path of movement of said rack cooperating with the switch operating mechanism of the motor for preventing two consecutive movements of the switch operating mechanism to pump operating position unless the resetting mechanism has completed its resetting travel.

'7. A liquid dispensing apparatus comprising a dispensing line adapted to be connected to a source of liquid supply, means including a delivery valve ior controlling the flow of liquid through the dispensing line, register mechanism operable in accordance with the fiow of liquid through the dispensing line, resetting means for the register mechanism, a pump for forcing liquid through said dispensing line, a motor for the pump, manually operated switch mechanism for the motor, and control means operable upon the movement of said pump means for effecting the operation of the register resetting means and the delivery valve, said control means including mechanism for efiecting the opening of the delivery valve a predetermined time after the operation of the register resetting means and including mechanism for locking the manually operated switch means for subsequent operation until after the completion of the resetting of the rack.

8. A liquid dispensing apparatus comprising a dispensing line adapted to be comnected to a source of liquid supply, a pump for forcing liquid through the line, a motor for the pump and a manually operated switch member for controlling the pump motor, means including a delivery valve in the dispensing line for controlling the flow of liquid through said line, register mechanism operable in accordance with the flow of liquid through said line, resetting means for the register mechanism and means actuated by the movement of said switch member for operating the register resetting means and said delivery valve, said means including mechanism for efiecting the opening of the delivery valve a predetermined time after the operation of the resetting means and including mechanism for maintaining the delivery valve in 17 open position until said pump switch operating member is thrown to such a position that th pump motor is rendered inoperative.

9. A liquid dispensing apparatus comprising a dispensing line adapted to be connected to a source of liquid supply, a pump for forcing liquid through the line, a motor for the pump and a manually operated switch member for controlling the pump motor, means including a delivery valve in the dispensing line for controlling the flow of liquid through said line, register mechanism operable in accordance with the flow of liquid through said line, resetting means for the register mechanism and means actuated by the movement of said switch member for operating the register resetting means and said delivery valve, said means including mechanism for effecting the opening of the delivery valve a predetermined time after the operation of the resetting means and including mechanism for preventing momentary closure of the delivery valve under momentary failure in the current in the line as distinguishing from the throwing of the pump motor switch to pump off position.

10. A liquid dispensing apparatus comprising a dispensing line adapted to be connected to a source of liquid supply, means including a delivery valve for controlling the flow of liquid through said dispensing line, register mechanism operable in accordance with the flow of liquid through the dispensing line, reset mechanism for the register mechanism, air release mechanism for said dispensing line including a pressure chamber subject to a relatively low pressure when the pump is idle and subject to substantial pressure when the pump is in operation, an hydraulic cylinder and liquid conduit connecting said pressure chamber with said hydraulic cylinder, a piston in said cylinder, and means actuated by movement of said piston for operating said reset mechanism and for opening said delivery valve, said mechanism efiecting the opening of the delivery valve a predetermined time after the operation of the register resetting means, and means for holding said delivery valve in open opsition during momentary movement of "large volumes of air through the air separator.

11. A liquid dispensing apparatus comprising a dispensing line adapted to be connected to a source of liquid supply, means including a delivery valve for controlling the flow of liquid through said dispensing line, register mechanism operable in accordance with the flow of liquid through the dispensing line, reset mechanism for the register mechanism, air release mechanism for said dispensing line including a pressure chamber subject to a relatively low pressure when the pump is in operation, an hydraulic cylinder and liquid conduit connecting said pressure chamber with said hydraulic cylinder, a piston in said cylinder, and means actuated by movement of said piston for operating said reset mechanism and for opening said delivery valve, said mechanism efiecting the opening of the delivery valve a predetermined time after the operation of the register resetting means, and means for holding said delivery valve in open position during momentary movement of large volumes of air through the air separator, a pump for forcing liquid through the dispensing line, a motor for driving the pump, a switch operating member for the motor and means interconnecting the switch operating mechanism and said movable member operated and moved by said piston for holding said delivery valve in open position while said switch operating member is in pump on" position and during the momentary movement of large volumes of air through the air separator.

12. A liquid dispensing apparatus comprising a dispensing line adapted to be connected to a source of liquid supply, means including a delivery valve for controlling the flow of liquid through said dispensing line, register mechanism operable in accordance with the flow of liquid through the dispensing line, reset mechanism for the register mechanism, air release mechanism for said dispensing line including a pressure chamber subject to a relatively low pressure when the pump is in operation, an hydraulic cylinder and liquid conduit connecting said pressure chamber with said hydraulic cylinder, a piston in said cylinder, and means actuated by movement of said piston for operating said reset mechanism and for opening said delivery valve, said mechanism effecting the opening of the delivery valve a predetermined time after the operation of the register resetting means, means for holding said delivery valve in open position during momentary movement of large volumes of air through the air separator, a pump'for forcing liquid through the dispensing line, a motor for driving the pump, a switch operating member for the motor and means interconnecting the switch operating mechanism and said movable member operated and moved by said piston for holding said delivery valve in open position while said switch operating member is in pump on position and during the momentary movement of large volumes of air through the air separator, and means for locking said pump switch operating member from subsequent pump operating movement until the completeion of the reset operation.

13. In a liquid dispensing apparatus comprising a dispensing line adapted to be connected to a source of liquid supply,.means including a delivery valve in said line for controlling the flow of liquid therethrough, registering means operable in accordance with the flow of liquid through said dispensing line, said registering mechanism including shutter mechanism operable to cover the computing indicia, said computing mechanism being of the type requiring a manual one and one eighth forward turn to complete the resetting operation thereof and followed by a one eighth turn in the reverse direction for the purpose of raising the shutters masking the numeral wheels at the termination of the forward one and ne ei hth turn, said computing mechanism including stop mechanism precluding further forward turning of said computing mechanism after the reset has been accomplished, said resetting means for the register including a reset shaft, a driving shaft for operating said reset shaft, means for actuating said driving shaft in a direction to cause the reset shaft to move one and one eighth turns to effect the resetting thereof and to cause the resetting mechanism to contact the stop and thus to prevent further continued movement'of said resetting mechanism, and clutch mechanism inserted between the driving shaft and the reset shaft including a driving element connected to said second shaft, a spring connected to the driving element, a driven element having the spring connected thereto whereby said driven element is rotated by means of said spring upon the rotation of said driving element, said driven element in cluding a pivoted trigger, a second driven element connected with the reset shaft for rotation trigger element having a toe adapted drivingly to engage said shoulder whereby upon movement of said driving and first driven element in one direction said toe engaging said shoulder will drive said second driven element in the same direction, and means brought into operation when said reset mechanism contacts the stop in the computer mechanism for breaking the connection between the driving element and said second driven element whereby the spring of the computer turns said second driven element reversely one eighth of a revolution, and means on said firstdriven element and on said driving element for reconditioning said driving and driven elements for a subsequent operation.

14. In a liquid dispensing apparatus, comprising a dispensing line adapted to be connected to a source of liquid supply, means including a delivery valve in said line for controlling the flow of liquid therethrough, registering means operable in accordance with the flow of liquid through said dispensing line, said registering mechanism including shutter mechanism operable to cover the computing indicia, said computing mechanism being of the type requiring a manual one and one eighth forward turn to complete the resetting operation thereof and followed by a one eighth turn in the reverse direction for the purpose of raising the shutters and masking the numeral wheels at the termination of the forward one and one eighth turn, and including a stop mechanism precluding further forward turning of said computing mechanism after the reset has been accomplished, said resetting means for the register including a reset shaft, a driving shaft for operating said reset shaft, means for actuating said driving shaft in a direction to cause the reset shaft to move one and one eighth turns to effect the resetting thereof and to cause the resetting mechanism to stop to prevent further continued movement of said resetting mechanism, and a clutch mechanism inserted between the driving shaft and the reset shaft including a driving element connected to said driving shaft, aspring having one end connected to the same, a driven element having the other end of the spring connected thereto whereby said driven element is rotated by means of said spring upon the rotation of said driving shaft, said driven element having thereon a pivoted trigger, said clutch mechanism including a second driven element connected with the reset shaft for rotation therewith, said second driven element having acam thereon, said cam having a shoulder, said trigger element having a portion adapted drivingly to engage said shoulder whereby upon movement of said driving and first driven element in'one direction said toe engaging said shoulder will drive said driven element in the same direction, and means operable when said reset mechanism is stopped for breaking the connection between the driving element and said second driven element whereby to permit the spring of the computer to turn said second driven element reversely one eighth of a revolution, means on said first driven element and on said driving element for reconditiom'ng said driving and driven elements for a subsequent operation, said means including aradially disposed lug on said first drivenelement and a spaced lug on said driving element.

15. A clutch for interconnecting a drivingshaft and a reset shaft of a computer of the type having a reset shaft inoperable when the computer is being driven and wherein said shaft is turned 405, degrees in one direction to reset the computer and is thereafter stopped, and wherein said reset shaft then rotates reversely 45 degrees, said clutch comprising a driving shaft, a shell driven thereby, a spring connected to the shell, a driving disk associated with said shell, the other end of the spring being connected with said driving disk whereby saiddriving disk is rotated by rotation of said shell, a trigger mechanism pivotally mounted on said driving disk, said trigger mechanism having an outwardly extending lug and a laterally bent toe, said clutch including an additional driven disk connected to said reset shaft, said disks and said shell having a common central axis concentrically mounted with respect to the axis of said driving shaft and said reset shaft, said second disk having a surface adapted to be engaged by said trigger mechanism to form a driving engagement between said first disk and said driven disk, whereby upon rotation of said driving shaft said second driven disk is rotated.

by said first disk through the agency of said trigger, and whereby when said reset shaft stops said toe of said trigger will be disengaged from the surface of said cam to break the driving connection and permit the spring in said computer to reversely rotate the driven disk 45 degrees, said shell having means adapted to engage the radially disposed lug on said trigger and said driven disk having a radially disposed lug adapted to'engage the peripherally disposed lug on said shell;

16. A clutch for interconnecting a driving shaft and a reset shaft of a computer of the type having a reset shaft inoperable when the computer is being driven and wherein said shaft is turned 405 degrees in one direction to reset the computer and then stops and wherein said reset shaft then rotates reversely 45 degrees, said driving shaft and reset shaft being disposed in alignment and said clutch concentrically surrounding the axis of rotation of said shafts, and said clutch including a drivingmember and a driven member and a spring interconnecting said driving and driven members, and said clutch including an additional driven member and a disconnectable driving means between said first driven member and said additional driven member and operable when said reset mechanism of the computer stops automatically to render inoperative the driving means between said first driving member and said driven member upon the completion of the resetting operation and thereby to permit said reset shaft to be reversely rotated 45 degrees by the spring mechanism in the computer.

17. A liquid dispensing apparatus comprising a liquid dispensing line adapted to be connected to a source of liquid supply, a pump in said line, a motor for driving the pump, a manually operated switch member for actuating the motor, means including a delivery valve controlling the flow of liquid through the dispensing line, register mechanism operable in accordance with the flow of liquid through the dispensing line, an hydraulic cylinder, a piston in the cylinder, connections from said cylinder to the flow line to cause the operation of said piston upon the creation of a pressure in the flow line, mechanism movably operated by the piston, means actuated by movement of said mechanism for operating the resetting mechanism, said mechanism upon a predetermined movement actuating said delivery valve, and latching means, disposed in the path of movement, of said mechanism and cooperating With the switch operating mechanism of the motor for preventing two consecutive movements of the switch operating mechanism to pump operating position unless the resetting mechanism has completed its full resetting travel.

18. A liquid dispensing apparatus comprising a dispensing line adapted to be connected to a source of liquid supply, register mechanism operable in accordance with the flow of liquid through the dispensing line, resetting means for the register mechanism, means responsive to the pressure of the fluid in said dispensing line for operating said resetting means, control means for effecting the operation of the register resetting means, said control means including mechanism to cause the complete automatic cyclic operation of the resetting means before said control means can be actuated again.

19. A fluid dispensing apparatus comprising a dispensing line adapted to be connected to a source of liquid supply, means for controlling the flow of liquid through the dispensing line, register mechanism operable in accordance with the flow of fluid through the dispensing line, resetting means for the register mechanism, means responsive to the pressure of the fluid in said dispensing line for operating said resetting means, control means for effecting-the operation of the register resetting means, said control means including mechanism for operating the flow control means in predetermined timed relation to the operation of the resetting means, and means operable upon the actuation of said control means to cause the complete automatic cyclic operation of said resetting means before the control means can be operated again.

20. A liquid dispensing apparatus comprising a dispensing line adapted to be connected to a source of liquid supply, pump means for forcing liquid through said line, switch means for controlling said pump means, a register mechanism operable in accordance with the flow of liquid through said line, resetting means for said register mechanism, means responsive to the pressure of the fluid in said dispensing line for operating said resetting means, control means for effecting the operation of said switch means and said resetting means, and means for holding said resetting means at the position occupied at the end of the resetting stroke until said control means is actuated again.

21. A liquid dispensing apparatus comprising a dispensing line adapted to be connected to a source of liquid supply, pump means for forcing liquid through said line, switch means for controlling said pump means, a register mechanism operable in accordance with the flow of liquid through said line, resetting means for said register mechanism, means responsive to the pressure of the fluid in said dispensing line for operating said resetting means, control means for efiecting the operation of said switch means and said resetting means, and means for holding said resetting means at the position occupied at the termination of the resetting operation until said control means is thrown to such a position that the pumping means is rendered inoperative.

22. A liquid dispensing apparatus comprising a dispensing line adapted to be connected to a source of liquid supply, pump means for forcing liquid through said line, switch means for controlling said pump means, a register mechanism operable in accordance with the flow of liquid through said line, resetting means for said register mechanism, means responsive to the pressure of the fluid in said dispensing line for operating said resetting means, control means for effecting the operation of said switch means and said resetting means, means for holding said resetting means at the position occupied at the end of the resetting operation, and linkage means interconnecting said holding means and said control means effective to release said resetting means from said holding means when the control means is thrown to such a position that the pumping means is rendered'inoperative.

23. Aliquid dispensing apparatus comprising a dispensing line adapted to be connected to a source of liquid supply, pumping means for forcing liquid through said line, switch means for controlling said pumping means, a register mechanism operable in accordance with the flow of fluid through said line, a resetting means for said register mechanism, means responsive to the pressure of the fluid in said dispensing line for operating said resetting means, control means for effecting the operation of said switch means and said resetting means, said control means including mechanism to cause the complete automatic cyclic operation of the resetting means before said control means can be operated again, and means for holding said resetting means in the position occupied after-the completion of the resetting operation until said control means is thrown to such a position that the pumping means is rendered inoperative.

24. A clutch for interconnecting a driving shaft and a reset shaft of a computer of the type having a reset shaft inoperable when the computer is being driven and wherein said shaft is turned 405 in one direction to reset the computer and then stops and wherein said reset shaft then rotates reversely 45, said driving shaft and reset shaft being disposed in alignment and said clutch concentrically surrounding the axis of rotation of said shafts, said clutch including a driving member attached to said driving shaft and a latch means pivotally mounted on said driving member, a driven member having a cam surface with a recessed portion formed thereon, said latch means having an anti-friction member mounted thereon, said anti-friction member being urged against said cam surface and into said recessed portion by a spring interconnecting said latch means and said driving member whereby to interconnect said driving member and said driven member during the reset operation and operable when said reset mechanism of the computer stops automatically to render inoperative the driving connection between said driving member and said driven member upon completion of the resetting operation and whereby to permit said reset shaft to be reversely rotated 45 by the spring mechanism in the computer.

25. A liquid dispensing apparatus comprising a dispensing line adapted to be connected to a source of liquid supply, a valve means for controlling the flow of liquid through the dispensing line, register mechanism operable in accordance with the flow of liquid through the dispensing line, resetting means for the register mechanism, automatic control means for operating said resetting means and opening said valve means, and hydraulic means operated by the pressure of the liquid in the dispensing line for actuating said automatic control means, said control means completing the resetting of said register mechanism before opening said valve means whereby to insure that all liquid passing through the dispensing line is registered on the register mechanism.

A iqui di nsin app ra s comprising a dispensing line adapted: to. beconnected to a source of liquid supply, pumpingmeansfor-forcing liquid through ,thezdispensing line, -valve means for controlling the flow of-Jiquid-throu'gh the dispensing line, register mechanism operable in accordance With-the flow otliqnid through the dispensing line, resetting: means-for the register mechanismswitch means for efiectingthe. operation of the pumping-means,.actuatingfmeans for said resetting means and said valve'means, and hydraulic means operated by. theliquidi-pressure in said dispensing line for operating saidactuating means, said actuating'means completing the resetting of the register-.mechanism-before opening said valve meansiwhereby to insure that all liquid passing through said" dispensing line is registered on said register mechanism.

127. A liquid. dispensing apparatus comprisinga dispensing line adapted-tobe. connected-to; a

source of liquid supply, valve-means for controlling the flow or liquidthrough the dispensing line, register mechanism operable in-accordance .with

the flow-of liquidthrough the dispensing line, re-

2 8. .A-liquid dispensing apparatus comprising a dispensing, line adapted to be connected .to a source'ofliquid supply, valve-means for controlling the flow of liquid through said dispensing line, pump; means for forcing liquid through said dispensing line, switch means for controllingsaid pump 'means, a register mechanism operable in accordance with the flow of liquid through said dispensing-line, resettingmeans for said register nechanism means responsive to the pressure of the fluid. in said dispensing line foroperating said resetting. means-and opening said valve means,

.said last mentioned means opening said valve means onlyafter said resetting means hascompleted the-resetting operation, control means for .efiecting the operation of said switch means, and

means for holding said resetting means at the position occupied at the end of the resetting .stroke-untilsaid control means is actuated.

ROBERT HILL. BURDETTE -W. FOSS.

IREFEBENCES CITED iTherfollowing references are of record 'inthe :fiieof this patent:

UNITED STATES PATENTS .Number Name Date 2,022,932 De Lancey Dec. 3, .1935 2,072,522. Lent Mar. 2, 1937 2,2 6' 7,793 Hayard Dec. .30, 19.41

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