US3044662A - Printer and interlock structure for motor fuel dispenser - Google Patents

Description

July 17, 1962 G. w. wRlGHT ETAL 3,044,662

PRINTER AND INTERLOCK STRUCTURE FOR MOTOR FUEL DISPENSER I T I l RoBERT A. YENNEY I I l INVENTORS ATTORN EY July 17, 1962 c.;` w. WRIGHT ETAL 3,044,662

PRINTER AND INTERLocx STRUCTURE FOR MoToR FUEL DISPENSER Filed May 2, 1960 4 Sheets-Sheet 2 173 ROBERT @NYI/211mg 'I I: I BYM/M/nm ATTORNEY.

July 17, 1962 G. w. WRIGHT ETAL 3,044,662

PRINTER AND INTERLOCK STRUCTURE FOR MOTOR FUEL DISPENSER Filed May 2, 1960 4 Sheets-Sheet 5 ROBERT A.YENNEY 1 N VEN TORS July 17, 1962 G. w. WRIGHT ETAI. 3,044,662

PRINTER AND INTERLOCK STRUCTURE FoR MOTOR FUEL DISPENSER Filed May 2, 1960 4 Sheets-Sheet 4 FIG. 5

GEORGE W.WRIGHT ROBERT A` YENNEY INVENTORS A'T'TORNEY 3,044,652 Patented July 17, 1962 3,044,662 PRINTER AND INTERLOCII STRUCTURE FR MTOR FUEL DISPENSER George W. Wright, Yoder, and Robert A. Yenney, Fort Wayne, Ind., assignors to Toixheim Corporation, Fort Wayne, Ind., a corporation of Indiana Filed May 2, 1960, Ser. No. 26,091 16 Claims. (Cl. 222-30) This invention relates. to a printer and interlock structure for a motor fuel dispenser. More specifically it relates to a mechanism for driving a printer from a commercial type of computer and for interlocking the operation of the dispenser with the operation of the computer and printer `so that after a ticket has been inserted in the printer and initially printed to indicate a starting or zero condition of the register and after a delivery has been made from the dispenser, a second delivery from the dispenser will be prevented until the ticket has been printed with the amount of the iirst delivery.

It is a further object of the invention to provide a mechanism which will permit numerous, successive de liveries from the dispenser when the printer has not been actuated to initially print the ticket.

Another object of the invention is to provide driving mechanism for connecting a commercially Kavailable printer to a commercially available dispenser so that the printer may be driven from the computer and the printer operating mechanism may be interlocked with the reset and `delivery control mechanism of the dispenser.

Other objects will become apparent from the study of this speciiication and the drawings in which:

FIGURE 1 is an elevation showing the printer and computer mounted in the dispenser and the driving and interlock connections between them.

FIGURE 2 is an elevation partially in section showing the drive mechanism `for connecting the printer to be driven by the computer.

FIGURE 3 is detail of the lower portion of FIGURE 2 showing the parts rotated ninety degrees.

FIGURE 4 is an exploded view of the computer reset and control mechanism.

FIGURE 5 is an elevation of the end of the computer opposite that shown in FIGURE 4.

FIGURE 6 is a view of the interlock mechanism in the position in which multiple deliveries may be made from the dispenser and FIGURE 7 is a view similar to FIGURE 6 showing i the interlock mechanism in la position to prevent further deliveries from the dispenser.

Referring first to FIGURE 1, numeral 1 indicates generally the dispenser while numeral 3 indicates generally the ticket printer which is of the type yshown and fully disclosed in the C. L. Mclvi'ullen Patent 2,086,363, issued July 6. 1937.

Numeral 5 indicates generally `a computing and registering mechanism such as that shown generally in the patent to H. N. Bliss No. 2,814,444, issued November 26, 1957.

The printer 3 includes an operating crank 7 which drives a shaft 9 and through gearing and other mechanism not shown herein but which is fully disclosed in said Patent 2,086,363, will reciprocate a ticket holder 11 as described below.

A lu-g or plate 13 is attached tothe ticket holder 11 and lmoves between the positions B and A shown in full and dashed lines respectively in FIGURE 1. In the idle condition of the ticket printer, the holder occupies the normal dashed line position A in this figure, and the operation of the ticket printer is such that, upon rotation of the crank 7 one revolution, the mechanism will imprint a ticket against the printing wheels to show their condition at the start of dispensing and will thereafter shift the ticket holder 11 and plate 13 to thevdisplaced, full line position B. The delivery will be made from the dispenser in a manner to be described below and upon completion of the delivery, the crank 'I of the ticket printer will be rotated a second revolution, which causes the printer mechanism to again imprint the ticket and thereafter restore the ticket holder and plate 13` to the normal, dashed line position A. The printing wheels, having been advanced by the computing mechanism during the delivery op-eration, will print the amount of this delivery when the second impression is taken.

The structure of the computer mechanism will now be briey described, reference being had to FIGURES 1, 4 and 5. A fuller description of the computer is found in ithe Bliss patent supra. The computer is indicated generally by numeral 5 `and has indicator dials 15 which comprise -a cost register and similar dials 17 which comprise the gallons register. The input shaft 19 shown in FIGURE 5 drives a variator mechanism indicated generally by numeral 21 and .the variator has a gallons output shaft 23 which is connected by gearing 155-152 to drive a gallons shaft 25 [andthe gallons register 17. This variator also has a cost output shaft 27 which is connected by gearing (not shown) to drive the cost register 1S. 'Ihe individual indicator wheels of registers 15 and i7 respectively, `are mounted to rotate on shafts 29 and 31, FIGURE 4, and have clutch mechanisms (not shown) which `are loperated by endwise motion of the shafts 29 and 31 to connect the registers either to the output drives from the variator or to the resetting mechanism shown in FIGURE 4.

The resetting mechanism, FIGURE 4, comprises shafts 33 and 35 to which are fixed respectively gears 37 and 39. These mesh with a master gear 41 to which is attached a ratchet 43. The gear 41 and ratchet 43 rotate freely on shaft 45. A resetting disc 47, a control disc 49 and a cam 51 are mounted by suitable hubs on shaft 45. Reset disc 47 is .provided with a hole 53 which receives Ia trunnion 55 of a pawl S7 which is disposed to engage the teeth of ratchet 43. A spring 59 is connected to the pawl and the disc 47 so as to urge the pawl into engagement with the natchet. The disc 47 also carries a pin r61 upon which is pivotally mounted a dog 63 which is urged into engagement with -a stop 65 on the control disc by means of a spring 67. An anchor post 69 projects :axially from the reset `disc 47 past the edge of the control disc and a resetting spring 71 has one end hooked to this post and the other end toa post 73 mounted on the side yframe 75 of the computer. A journal 77 mounted in the side frame 75 extendsnaxially past the edges of the gear 41 and discs 47 and 4S and a pawl 79 is pivotally mounted thereon and is urged by `a spring 81 into engagement with teeth 83, S5 and 87 formed on the edge of the control disc 49 substantially opposite to the stop 65. This pawl has a pin 89 which ex-tends axially toward the trame 75 past the disc 49 into the path of a cam 91 and a stop 93 for-med on the reset disc. A cam follower lever 95 is also rotatably mounted on the journal 77 and has a cam follower surface 97 which is unged into contact with cam 5,1 by spring 99. Cam 51 also has ya pin 101 which extends toward the control disc 49 and enters a lost motion slot 103 formed therein. Cam follower'95 is provided with a'projection 105 which overlies the tail 107 of dog 63. Reset disc 47 `also has a cam 109 which coacts with a pin 111 on the latch pawl -113 which is normally engaged with ratchet 43. A dashpot is pivotally mounted on a stud =117 on side frame 75 and has a plunger 119 which carries a roller 121 on a pin 123. The roller comprises an outer met-al rim mounted on a rubber center portion 125. Cam 51 is attached to a hub 127 which is operated manually in a aoaaeea clockwise direction to cause the computer registers to be reset and to close the motor control switch of the dispenser after resetting has been completed. The hub is rotated in a counterclockwise direction (FIGURE 4) to open the switch and to cock the spring 71 Vafter dispensing has been completed as described in detail below. This hub 127 vis fixed to the shaft 45 which extends through the computer mechanism and projects from the opposite side frame 129 shown in FIGURE 5. This end of the shaft is connected to rotate a cam 131 which reciprocates a slide bar 135 by acting on rollers 137 mounted thereon. The reciprocation of the slide bars is transmitted through levers 139, 141 to respective shafts 143, 145 which carry gear sectors `147 and 149 at their opposite ends. Sectors 147 engage rack teeth 151 formed on the ends of the clutch shafts 29 and sectors 149 engage rack teeth 153 formed on the ends of the clutch shafts 31.

Operation of Computer Reset Mechanism Referring to FIGURE 4, the cam 51 has an initial position which is shown in FIG. 4. The lever 82, shaft 80, hub 127 and cam 51 are movable from this initial position through a distance representing the lost motion provided by slot 103 in disc 49. Assuming that arm 215 is lifted to free 95, the first operation of hub 127, by means of lever 32 and shaft 80, in the clockwise direction from such initial position is limited by the contact of pin 101 with the right hand side of slot 103. 'IIhis movement of cam 51 causes the follower 95 Ito be rotated clockwise about journal 77 and causes the projection 105 thereof to depress the tail 107 of dog 63 so as to free the dog from the stop 65 on control disc 43. Reset spring 71 is under full tension in this condition of the parts and control disc 49 has teeth 83 engaged by pawl 79 so that the disc cannot rotate clockwise. Upon release of dog 63 as described, spring 71 will rotate disc 47 in a clockwise direction and pawl 57 which is mounted in disc 47 will rotate ratchet 43 and resetting gear 41 clockwise. The gear 41 in turn rotates the resetting gears 37 and 39, reset shafts 33 and 35 and through additional gearing will reset the registers 15 and 17 to zero.

It should also be noted that the rotation of hub 127, cam 51 and shaft 45, through the distance permitted by the lost motion, will not alter the position of cam 131 (FIGURE sufficiently to move the bar 135 which therefore maintains the shafts 29 and 31 in the position in which the indicator wheels of registers and 17 are clutched to the reset mechanism and are declutched from the output shafts 23 and 27 of the variator.

As disc 47 is rotated clockwise by the spring as described, the cam 91 thereof will act on pin 89 of pawl '7 9 to cam the pawl free of the teeth `83 of the control disc and will thereupon rotate further until the stop 93 of disc 47 rests on pin 89 of the latch pawl 79.

Since the control disc 49 is now free from pawl 79, further rotation of lever 82, cam 84, hub 127, cam 51, control dise 49 and shaft 45 (FIGURE 4) land cam 131 (FIGURE 5) to the second, clockwise position, is now possible. Such rotation must be accomplished manually by lever 82 and is limited by stops (not shown). Such rotation causes cam 131 to shift bar '135 and through the mechanism described above, this, in turn, shifts the shafts 29 and 31 so that the indicator wheels of registers 15 and 17 will be declutched from the resetting mechanism and will be clutched to the output shafts 27 and 23 so as to be driven thereby when delivery is made. Such further rotation of cam 51 will produce lfurther clockwise rotation of cam follower 95 to substantially the position shown in `FIGURE 7. After completion of the delivery of the required amount of liquid, the lever 82, yhub 127, cam 51, control disc 49, and shaft 45 will be rotated in a counterclockwise direction manually (FIGURE 4).

During the clockwise rotation of control disc 49, as

described above, the stop 65 will have passed the coacting end of pawl 63 so that upon the countcrclockwise rotation of the control disc, the stop 65 v/ill engage the pawl 63 and thereafter the reset disc will also rotate countercloekwise with the control disc, to tension or cock the reset spring 71. Such motion of the reset disc also removes cam 91 from engagement with pin S9 of latch pawl 79 so that this pawl will again engage the edge of the control disc 49. The counterclockwise rotation of hub 127 and its associated parts to their initial positions is limited by stop means not shown and, upon release of the hub 127 from manual operation, these parts will again be held in the initial position by the engagement of the teeth 83 of the control disc with the pawl 79. During the described countcrclockwise rotation of these parts, cam 131 will again operate bar 135 `and its associated mechanisms to shift shafts 29 and 31 to the initial position, in which the indicators of registers 15 and 17 are disconnected from the output shafts 23, 27 and are `connected with the resetting mechanism.

Primer Drive Referring to FIGURES l, 2 and 3, the pinion 155 on the gallons output shaft 23 drives a gear 157 on shaft 25 and the cost output shaft 27 crosses shaft 25 in closely spaced relation thereto.

A support 159 is provided with a downwardly open yoke 161 which rests on the horizontal shaft 25 and with 4a laterally extending yoke 163 which spans the vertical shaft 27 to keep the support from moving along shaft 25.

The support also has arms 165, 166 extending at right angles to the yoke `163, which are drilled at 167 and 169 to receive shaft 171 which has a pinion 173 pinned to it so as to be spanned by said arms. The hole 169 is a blind hole and supports the shaft with pinion closely adjacent arm while the latter prevents the pinion and shaft from rising. This pinion is thus held in mesh with and is driven by gear 157.

A plate is fixed tothe top of the end frames 5 of th computer and a gear box 177 is fastened thereto by screws 179. The input shaft 181 of this gear box is connected to shaft 171 by a universal joint 183 (FIGS. l and 2). Shaft 181 drives the gears 185 which, in turn, drive the output shaft E37. rl`he latter is supported in a bearing 189 (FIG. l) which is mounted on the ticket printer support 191 while the support 191 is `mounted on plate 175. A cross pin 193 in shaft 187 drives a slotted socket 195 which is mounted on and depends from the printer drive shaft.

The mechanism described, rotates the gallons type Wheels of the printer (not shown) -in time with the gallons dials 17 of the computer so that the number of gallons delivered will be printed on the ticket by the type wheels.

Interlock As mentioned above, the plate 13 is moved between its dashed line position indicated by A to its full line position B during the initial operation of the printer crank 7.

The plate 13 carries a boss 197 which receives and holds one end of the wire 199 of a Bowden cable 201. The casing of the cable is clamped to the printer frame by clamp 203 and to a bracket 297, which is fastened at 269 to plate 175 of the computer, by a clamp 205.

A bell crank 211 is pivotally mounted on a threaded stud 213 which is iixedly mounted in a tapped hole 214 on the computer end frame 5 (FIGS. l, 4, 6 and 7). This crank has a latching arm 215, which is notched at one end to provide a tooth which overlies upwardly extending .projection 219 on the cam follower 95.

The other arm of the bell crank has an outwardly bent ear 221 through which the other end of the core wire 199 of the Bowden cable extends and a collar 223 is fastened to the projecting end of the Wire.

A helical compression spring 225 surrounds the core aca-@gasa wire 199 on the opposite side of the ear from the collar and bears at one end on the ear and at the other end on a washer 22S which rests against the end ofthe cable sheath. Thus the spring will continuously urge the bell crank to rotate counterclockwise thereby urging the latch arm 215 toward engagement with the projection 219 on follower 95. The rotative position of the bell crank is determined by the position of collar 223 which is dependent upon the position of the ticket chute 11. Thus if the latter and plate 13- occupy the A Iposition, the collar will hold the `bell crank in its clockwise position, whereas if ticket chute occupies the B position, the collar 223 will be moved so that the bell crank can be moved to its counterclockwise position under the action of spring 225.

However, such rotation of the ybell crank may be prevented by a latch pawl 227 which is pivotally mounted on a pin 229 supported on a bracket 231. The latter is supported on the stud 213 and the stud M7 which supports the dashpot 115.

The pawl 227 has one end 233 disposed in the path of one of the clutch shafts 29 and the other end is provided with a hook 235 which is adapted to engage the lower edge of pawl arm 215 of the bell crank.

A spring 237 is xed to bracket 231 and depends behind to hook end of pawl 227 so as to urge the hook into engagement with arm 215.

A spring 239 (FIG. l) is connected at one end to a pin 241 extending from the `control plate 49, past the edge of cam 51 and the other end of the spring is anchored on a projection on the stud 213 which supports the bell crank.

OPERATION W itlzout Ticket Printing Assume that both the dispenser and ticket printer occupy their idle positions which they normally occupy at the end of a dispensing operation, with the power shut off and the previous ticket printed and removed.

In such condition7 the ticket chute 11 and plate 13 will occupy the A position (FIG. l) and collar 223 will hold the bel-l crank 2-1-1 in its clockwise position (FIG. 6), in which the arm 215 is above the level of the hook 235 of pawl 227. The shaft 29 is withdrawn into frame 5 as indicated in FIGURE 6, so that spring 237 holds the pawl 227 with its hook 235 projecting `beneath arm 215. The arm is, however, raised slightly above the hook so that it does not rest thereon.

The cam 51, cam follower 95, control crank 82 and cam 34 will be positioned as shown in FIGURE l. The switch 85 will be in the open or oli condition so that the motor pump (not shown) will be idle. It must be remembered however, that the arm 215 is not in the position shown in gure but is lifted out of blocking position relative to follower 95 as shown in FIGURE 6.

In this condition it will be seen that the crank S2 can be operated to rotate cam 51 from the initial position to the limit of the lost motion 101-103- This rotates cam follower 95 which trips dog 63 and frees the resetting disc 47. The spring 71 then rotates this disc to reset the gallons and cost registers to zero. Upon completion of resetting, cam 91 unlatches pawl 79 so that the lever 8 2 can ybe rotated clockwise to its fullest extent which is its second position. During this operation cam S4 closes and holds closed the motor switch 83. n

The iirst part of the rotation of shaft 45 (FIGURE 5) after resetting is completed operates cam 1311 and the associated parts to move the shaft 29, at the upper left of this view, inwardly, away from the observer. This shaft, as viewed in FIGURES l, 4, 6 and 7 moves outwardly against the upper end 233 of pawl 227 and withdraws the hook 235 of the pawl from underneath the arm 215.

This action produces no result, under the conditions Accordingly, the delivery may be made and at the completion thereof, the handle 82 will be rotated counter- `clockwise to its initial position. This causes cam 84 to release switch 58, which opens the control plate 49 and dog 63 restore the resetting plate 47 and the parts associated therewith to their initial positions and the movement of the plate `47 cocks the reset spring 71. The shaft 45 also actuates cam 131 which restores the clutch shafts to their initial positions.

It will be obvious that so long as the latch pawl arm 225 of the bell crank is retained in its FIGURE 6 position, the dispenser may be operated through any number of dispensing cycles at will.

With Tic/'cef Printing When it is desi-red to record any dispensing transaction on a ticket, the ticket will be inserted in ticket chute 11 and crank 7 will be operated for one revolution. As described in the McMullen patent, the mechanism operated by the crank locks the ticket in the chute, moves the chute to the B position (FIGURE l) and takes an impression of the type wheels.

As the ticket chute shifts to the B position, the core wire 199 of the Bowden `cable is moved and moves the collar 223 to the dashed line position (FIG. v6). The spring 225 rotates the bell crank counterclockwise until the arm 215 rests on the hook 235 of pawl 227 but the tooth 217 is still held in a position in which it is unable to engage projection 219 of follower 95. Consequently 'the handle 52 (FIG. 4) is free to turn clockwise from its initial position to reset the registers, and thereafter to eect the shifting of cam 131 and to close the switch so` that a delivery can be made.

When the cam 131 is operated as described above, shaft 29 is projected into engagement with the end 233 of pawl 227 and the latter is actuated thereby to withdraw the hook 235 from arm 215. The bell crank is then rotated counterclockwise (FIG. 7) by spring 225 until it is stopped in its effective position by contact of ear 221 with the collar 223. The arm 215 is thus effectively positioned in the path of cam follower projection 219.

Thereafter, when the handle 82 is rotated counterclockwise (FIG. 4) to its initial position to terminate dispensing, the projection 219 of the cam follower 95, which is rotated counterclockwise by spring 99, will engage and wipe along the bottom edge of the arm 215, rotating it clockwise against the action of spring 225 and, after the projection passes the tooth 217, the arm 215 will rotate oppositely to position the tooth in the path of the cam follower as shown in FIGURE l to effectively prevent clockwise rotation thereof.

lt should be noted that upon the counterclockwise rotation of handle 82, shaft 29 is withdrawn from contact with the end of pawl 227 and the latter is rotated counterclockwise by spring 237 (FIG. 7) until the end of its hook 235 rests against the side of arm 215. However, this arm is not rotated clockwise by projection 219, when the latter returns to its initial position, sufficiently to allow the hook to enter beneath the lever.

Accordingly, no further dispensing operation can be carried out until the arm E21'5 has been rotated to clear the tooth from the path of the projection because rotation of cam 51 is blocked by follower 95 which is latched against clockwise rotation.

Movement of arm 215 from its elfective position can be accomplished only by rotating the crank 7 ofthe ticket printer another revolution which, as described in the McMullen patent, causes the ticket chute to move from its B to its A position (FIG. l), to take another impression from the gallonage ltype wheel-s and to unlock the ticket so that it may be taken out of the chute.

The described movement of the chute to the A position pulls on the Bowden cable wire 199 so that collar 223 engages ear 221 of the bell crank lever 211 and thereafter rotates this lever, clockwise out of its effective aos/.gees

position, against the action of spring 225. Such action raises arm 215 above the level of hook 235 which is then moved to latching position under the arm by spring 237.

Thus whenever a ticket has been inserted in the printer and the initial impression of the type wheels has been taken, the dispenser can be operated to perform only one dispensing operation. It cannot perform a second delivery until the ticket has been imprinted a second time to record the gallons reading of the type wheels at the end of the delivery.

While the printer disclosed by the McMullen patent contemplates printing the amount of the prior delivery first and the amount of the last deliver second so that the gallons dispensed can be ascertained by subtraction, later versions of this machine include a resetting mechanism which is operable during the first rotation of the crank 7, prior to taking the first impression, for zeroizing the type wheels. In both cases the two printing operations and the two ticket chute shifts are performed and whether the type wheels are zeroized or not is immaterial to the present invention.

lt is obvious that various changes may be made in the form, structure and arrangement of parts of the specific embodiments of the invention disclosed herein for purposes of illustration, without departing from the spirit of the invention. Accordingly, applicants do not desire to be limited to such specific embodiments but desire protection falling fairly within the scope of the appended claims.

We claim:

l. A liquid dispenser comprising a ticket printer including manually operable first means having an initial condition, said manually operable first means being operable through a printing cycle to a second condition and being subsequently operable through another printing cycle to its initial condition, manually actuable second means, movable from an initial position in which it prevents dispensing to a second position in which it permits dispensing and back to said initial position, latching means having an effective position in which it coacts with said second means, in the initial position thereof, to prevent movement of said second means toward said second position, means responsive to said lirst means, in the initial condition thereof, for holding said latching means out of effective position, means responsive to the operation of said first means to its second condition and responsive to the actuation of said second means toward said second position, for moving said latching means to its effective position, said latching means coacting with said second means, after the return thereof to its initial position, for preventing a subsequent actuation of said second means toward its second position.

2. The structure dened by claim 1 which includes means responsive to the operation of said first means to its initial condition for withdrawing said latching means from its effective position.

3. The structure defined by claim l which includes means for urging said latching means toward its effective position, wherein said latching means, in its effective position is disposed by said urging means, in the path of said second means and wherein said second means includes an element disposed to displace said latching means from its effective means against the action of said urging means, during the return of said second means to its initial position, said urging means Serving to restore latching means to its effective position when said second means reaches said initial position.

4. The structure defined by claim 1 which includes a resettable visual register, means for simultaneously advancing the count on said register and printer in accordance with the amount of liquid dispensed and means operable by said second means upon movement thereof toward its second position for resetting said register.

5. The structure defined by claim l which includes a second latch disposed to prevent said latching means from occupying its effective position after said rst means is operated to its second condition, and means operable by said second means, during the movement of said second means beyond the point of its travel toward its second position at which resetting is completed, for disabling said second latch.

6. The structure defined by claim 5 wherein said latching means, in its effective position is disposed by said urging means, in the path of said second means and wherein said second means includes an element disposed to displace said latching means from its effective means against the action of said urging means during the return of said second means to its initial position, said urging means serving to restore latching means to its effective position when said second means reaches said initial position.

7. A liquid dispenser comprising a ticket printer including a movable ticket holder having a normal and a displaced position, manually operable first means for operating said printer in a printing cycle and for moving said holder to its displaced position and for subsequently again operating said ticket printer in a printing cycle and for moving said holder back to its normal position, manually operable second means, movable from an initial position in which it prevents dispensing to a second position in which it permits dispensing and back to said initial position, latching means having an effective position in which it coacts with said second means, in the initial position thereof, to prevent movement of said second means toward said second position, means for urging said latching means toward its effective position, means operable by said holder when it is moved to its normal position, for moving and holding said latching means out of its effective position, said last named means being rendered ineffective by said holder when it is moved to its displaced position, additional means for holding said latching means out of its effective position after movement of said holder to its displaced position and means responsive to the movement of said second means from its initial position toward its second position for disabling said additional holding means, to permit movement of said latching means to its effective position -by said urging means.

8. The structure defined by claim 7 which includes means responsive to the operation of said first means to its initial condition for withdrawing said latching means `from its effective position.

9. The structure defined by claim 7 which includes a resettable visual register, means for simultaneously ad vancing the count on said register and printer in accordance with the amount of liquid dispensed and means operable by said second means upon movement thereof toward its second position, for resetting said register.

10. A liquid dispenser comprising a ticket printer including a movable ticket holder having a normal and a displaced position, manually operable first means for operating said printer in a printing cycle and for moving said holder to its displaced position and for subsequently again operating said ticket printer in a printing cycle and for moving said holder back to its normal position, manually operable second means, movable from an initial position in which it prevents dispensing to a second position in which it permits dispensing and back to said initial position, latching means having an effective position in which it coacts with said second means, in the initial position thereof, to prevent subsequent movement of said second means toward said second position, means for urging said latching means toward its effective position, means operable by said holder, when it moves to its normal position, for moving and holding said latching means out of its effective position, said last named means being rendered ineffective by said holder when it moves to its displaced position, additional means for holding said latching means out of its effective position after movement of said holder to its displaced position and means responsive to the movement of said second means from its initial position toward its second position for disabling said additional holding means to permit movement of said latching means to its effective position by said urging means, said responsive means serving to condition said additional holding means for movement to its effective position upon movement of said second means to its initial position.

11. The structure defined by claim 7 wherein said additional holding means comprises a pawl, yieldable means for urging said pawl into the path of said latching means, said latching means and pawl being relatively disposed so that said latching means, in its effective position, holds said pawl out of said path.

12. A liquid dispenser comprising a ticket printer including a movable ticket holder having a normal and a displaced position, manually operable first means for operating said printer in a printing cycle and for moving said holder to its displaced position, and for subsequently again operating said ticket printer in a printing cycle and for moving said holder back to its normal position, manually operable second means, including a lever, movable between an initial, dispensing preventing position to a second, dispensing permitting position, a latching arm, means mounting said arm vfor pivotal movement between an idle and an effective position, in which it coacts with said lever to prevent movement thereof from said initial position, first yieldable means for urging said arm toward its effective position, a pawl mounted lfor movement into the path of said arm when said arm is in its idle position, second yieldable means -for urging said pawl into said path, means for holding said pawl out of said path when said arm occupies its effective position, means connecting -said holder tovmove said arm to its idle position when said holder moves to its normal position, to enable said pawl to enter said path, said connecting means serving to free saidarm for movement to its effective position when said holder moves to its displaced position, said first yieldable means serving thereupon to move said arm into engagement with said pawl, and means actuable inl response to the movement of said second means toward its second position, for withdrawing the pawl from said path to free said arm for movement to its effective position.

13. The structure defined by claim l2 which includes a resettable visual register, means for simultaneously -advancing the count on said register and printer in accordance with the amount of liquid dispensed and means operable by said second means upon movement thereof toward its second position for resetting said register.

14. The structure defined by claim 13 wherein said second means includes means for first actuating said resetting means and means for thereafter actuating said pawl References Cited in the file of this patent UNITED STATES PATENTS 4Eickmeyer et al. July 25, 1944 Crews May 22, 1951

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