US1981335A

US1981335A - Liquid dispenser

Info

Publication number: US1981335A
Application number: US579688A
Authority: US
Inventors: Paul S Shield
Original assignee: Individual
Current assignee: Individual
Priority date: 1931-12-08
Filing date: 1931-12-08
Publication date: 1934-11-20
Anticipated expiration: 1951-11-20

Description

Nov. 20, 1934. P, s H D 1,981,335

LIQUID DISPENSER Filed Dec. 8, 1931 4 Sheets-Sheet l ATTORN Nov. 20, 1934. P. s. SHIELD LIQUID DISPENSER Filed Dec. 8, 1931 4 Sheets-Sheet 2 om 0m:

mil

5 09 as m 3. mm 91 ATTORN Nov. 20, 1934. P. s. SHIELD LIQUID DISPENSER Filed Dec. 8, 1931 4 Sheets-Sheet 3 ATTORNEY Nov. 20, 1934.

P. S. SHIELD LIQUID DISPENSER Filed Dec. 8, 1931 4 Sheets-Sheet 4 mNN Pm: 0, Q9

ON MQNA m2 $2 5 fli x l fi ATTORNE Patented Nov. 28, 1934 UNHTED STATES LIQUID DISPENSER Paul S. Shield, Cincinnati, Ohio, assignor to [augustine Davis, Jr., Cincinnati, Ohio Application December 8, 1931, Serial No. 579,588

19 Claims.

The invention relates to measuring liquid dispensers, specifically gasolene dispensers.

The object of the invention is to provide a simple and reliable hydraulic system for controlling the dispenser from the nozzle end of the hose through which the gasolene is delivered from the dispenser to the customers tank.

For this purpose a hydraulic control offers advantages over a mechanical control, but how to realize them has been a problem.

One of the difiiculties encountered in devising a successful hydraulic control for a gasolene dispenser was loss in volume of the working body of operating liquid resulting from leakage or shrinkage under cold. Such loss or shrinkage would draw air into the working system, or, in any event, the result would be that the hydraulic device at the dispenser would move an insufficient distance or unreliably, when the operating device at the nozzle was operated.

One of the objects of the invention is to overcome this drawback by automatically replenishing the liquid in the working parts of the hydraulic control system, and for relieving these parts 01" any Thus, a constant-volume body of working fluid is insured. Means for instantly replenishing the hydraulic system are preferably provided at both ends, that is to say, at the nozzle end and at the dispenser end.

With rising temperatures, the liquid in the hydraulic system will expand. A further object of the invention is to take care of this expansion so as to avoid any detrimental effect on the operation of the system.

Another object of the invention is to provide an automatic catch which, when the nozzle handle is released, will function to hold the delivery conduit valve of the dispenser slightly open. When this catch is released the delivery valve closes completely. This facilitates draining of the hose.

The complete system of control includes means for controlling the operation of a shut-off and flow-regulating valve in the delivery conduit of the measuring dispenser to which the hose is connected, a master valve controlling the supply of liquid to the dispenser, and a switch or other appropriate power-control organ for the motor which drives the pump.

Generally, the hydraulic system for controlling the dispenser'from the nozzle end of the hose may operate any one or more of these control organs of the dispenser itself. In the dispenser to which the invention more especially relates, the delivery valveis at the outlet of the dispenser and behind the hose, so that any unit quantity registered on the dispenser is delivered to the customer. With a delivery valve so located, it is essential to control it from the nozzle. In the type of dispenser hereinafter described, it is also important, or at least desirable, to provide a master valve controlling the supply of gasolene or other liquid to the measuring apparatus. The hydraulic control system of the in- I vention can,- and preferably does, control a valve at the supply side of the dispenser. It preferably controls both a master valve and a delivery valve. Furthermore, the operation of these two valves is preferably synchronized. A switch or other power-control organ of the motor which drives a pump to operate the dispenser may be controlled from the nozzle by thesame means, 'or it may not. The invention is not necessarily limited to the specific control organ, or combi nation of organs, of the dispenser which is operated from the nozzle.

Another object of the invention is to synchronize the movement of the delivery valve of the dispenser with that of the master valve which controls the supply of liquid to the dispenser, thus obtaining a better control of the outgoing liquid.

The discharge hoses are subject to rough usage. A further object of the invention is to provide a simple means for removing a wornout hose and substituting a new one without disturbing the parts of the hydraulic control system.

It is also an object to enable the delivery valve at the dispenser to be adjusted while making a delivery, by manipulation of the manual device at the nozzle so as to control the rapidity of discharge into the customers tank.

The foregoing and other objects and features of the invention will be readily understood from a consideration of the preferred embodiment which is described in the body of the specification and illustrated in the accompanying drawings forming part thereof.

In the said drawings:

Fig. 1 is a view, principally in a central vertical section through the dispenser, with certain portions broken out, the outer portion of the delivery passage, the delivery hose and parts at the end thereof are in elevation, the intermediate part of the hose being broken out. A part of the reversing mechanism of the dispenser which actually lies behind the plane of the section is shown projected over to one side of the View.

' View, taken on the irregular line -5 of Fig. 4.

Fig. 6 is a cross-sectional view taken on the line @6 of Fig. 4.

Fig. '7 is a fragmentary detail sectional View taken at right angles to Fig. 4, of a ball check valve used in the hydraulic control system.

Fig. 8 is a bottom plan view of the parts shown in Fig. 7.

Fig. 9 is a longitudinal section with parts in elevation, showing the construction at the outer end of the hose.

Fig. 10 is a detail vertical sectional View on the line 10-10 of 9.

Fig. 11 is a fragmentary detail horizontal section on the line 11-11 of Fig. 9.

The type of dispenser to which the invention is applied in these drawings is one having twin measuring chambers each of which in turn is filled while the other is emptying, the reversal of flow to and from the. chambers being effected by an automatic mechanism.

The twin measuring chambers are marked, 2 and 2. 3 is a supply passage and 4 is a discharge passage, to the end of which latter the hose 5 is connected. A bulls eye or sight-glass 5 is preferably placed in the wall of the outer portion of the discharge passage so that the unit quantities of liquid can be seen passing from g the dispenser.

The chambers preferably have vent openings 6 at the top, these vent openings being interconnected by a pipe '7 and being closed alternately, when each chamber is completely filled, by float valves 8. Connected with the pipe 7 is an inwardly-opening, spring-closed air-admission valve 105.

The supply passage 3 is connected with a storage tank and contains a pump 9 which is driven by a motor 10, preferably though not necessarily an electric motor. In common with other dispensers of this type, a relief valve 11 is preferably placed in the supply line to divert liquid into a return line 12 and thereby limit the pressure that can be placed on the liquid going to the chambers and the reversing mechanism. The supply passage 3 is connected with a master valve chamber 120 in the casting 106 of the dispenser. This valve chamber communicates through an opening, which it is not necessary to illustrate, with a continuation passage 3 in the casting, the ends of this passage opening into the opposite ends of a slide valve chamber 121.

The reversing mechanism illustrated is of a known type comprising a piston 13 exposed to the liquid pressure developed in the measuring chambers, a four-way slide valve 14 in the chamber 121 and a spring-toggle valve-actuating device 15. The valve connects each measuring chamber alternately with the supply and discharge passages, one chamber being connected with the supply while the other is connected with the discharge and vice versa. When either the length ofthe link.

chamber is empty and the other is filled with liquid, the pressure developed on this liquid by reason of the corresponding vent 6 being closed acts on the piston 13, moving the latter to the right or to the left depending upon its lastposition. This movement stores up power in the snap-over action device 15, and after the latter is moved past center its spring acts to reverse the position of the valve. This operation is repeated automatically while liquid continues to be supplied to the measuring chambers.

The dispenser as thus far described is similar to that of the Carbonaro Reissue Patent No. 17,287, dated May '7, 1929, but the invention is not limited to this form of execution.

A rock-shaft 16 is oscillated by an arm 101 which is opcratively connected with the piston 13.

The snap-over action device 15 includes an arm 20 rigidly clamped on the shaft 16 outside of the valve casing and immediately behind the arm 101, though projected to one side in Fig. 1 for clearer illustration. The

arms

20 and 101 move as a unit with the shaft 16 as the shaft oscillates on its axis. A link 22 has one end pivotally connected with the shaft 16. A compressible link 24 has a pivot connection 26 with the arm 20. The lower end of the compressible link 24 has pivot connection 28 with the link 22.

Thelink 22 is made of telescoping sections With a compressed spring which tends to increase With the parts in the positions shown in Fig. 1, the pressure of the spring tends to move the arm 22 in a counterclockwise direction around the shaft 16. When the shaft 16 is turned so that the pivot connectionZfi is on the other side of a line between shaft 16 and. pivot connection 28, then the pressure of the spring of link 24 tends to move the link 22 in a clockwise direction around shaft 16.

Another rock shaft 103 extends through the wall of the valve casing and operates the valve 14 through an arm 104, which is rigidly connected to the shaft 103. An arm 102 is rigidly connected to the shaft 103 outside of the valve casing and just behind the arm 104. The arm 102 is projected out 01' its true position in Fig. 1 for clearer illustration.

The arm 1021s operated by a pin 30 on the lower end of the link 22. This pin extends through a slot in the upper end of the arm 102. l

The starting and stopping of themotor is effected by means of a switch or cut-out which is indicated schematically at 93, electrical wiring 93 connecting the same with the motor. Naturally, a motor of the fluid-actuated type might be used in place of an electric motor, in which event a valve controlling the motive fluid would be theequivalent of a switch.

The supply pipe 3, as previously stated, connects with a valve chamber 120 in a casting 106'.

containing the chambers in which the piston 13 and the reversing valve 14 operate, this casting being formed with suitable passages, not

necessary to illustrate or describe in detail, for

connecting one of the

chambers

2, 2 with the supply passage while the other is connected with the discharge passage, these conditions being reversed with each reversal of the valve 14. Thus, the outlet of the valve chamber 120, which forms a part of the supply passage, is to be understood as being connected by fluid-ways, not

shown, with the ends of the reversing-valve member 91, which in the present embodiment of the invention takes the form of a butterfly valve. When this valve is closed against a stop 130, the supply of liquid to the dispenser is cut off. It follows that if either one of the measuring chambers is then full and the liquid pressure is then seeking to operate the reversing mechanism, such pressure is relieved by the closing of the master valve and thereafter the revelsinfi mechanism will not operate.

The valve member 91 is connected by a link 144 with an arm 146 fixed to a rock-shaft 89. This rock-shaft passes through a suitably packed opening in the wall of the up-stream part of the valve chamber 120 to the outside of the dispenser casting 106, where it carries a crank-arm 88. Another arm 88 fixed to the rock-shaft 89 is connected by a link 92 with one arm of a bell-crank lever 94. The other arm of the bel1- crank lever 94 is connected to a thrust member 95, which operates the on button 96 of the power-control organ 93. The off button 96 of the power-control organ may be operated manually by the attendant. Naturally, the provisions for operating the master valve and the power-control organ may be widely varied.

The outer section 4 of the delivery conduit of the dispenser contains a valve member 147, a function of which is to shut off flow from the dispenser to the hose 5 in case of necessity. In addition, this valve is operable to throttle or regulate the discharge, so as to increase or decrease the speed of delivery during the filling of customers tanks. V

This valve closes in the direction of flow, against a beveled valve seat 148 formedat the entrance to the conduit section 4 The valve member preferably comprises a composition gasket 149 clamped between

metal parts

150 and 151. The body of the down-stream part 151 is circular and is disposed within the cylindrical inner surface of a guide 152 which projects down-stream in the conduit section 4 An appreciable clearance 153 between the

parts

151 and 152 affords a restricted annular passage when the valve is moved to separate the gasket 149 from the seat 148 but not moved far enough to carry the obstructor 151 out of the broad cylindrical opening through the guide. When the part 151 is moved out of said opening, free flow of liquid through the valve is permitted, and by moving the part 151 relatively to the beveled surface 148 this outflow can be increased or decreased in a manner to secure very effective control of the speed and force of discharge.

The part 151 of this valve member is formedwith guide wings 154 which contact slidably with t1:v interior of the guide 152. A spring 155 reacting between the up-stream face of the valve member 147 and an abutment 156 in the discharge passage acts to close the valve.

On the outer end of the hose 5 there is a hollow body 157 containing the fluid passage 158 (Fig. 9). The nozzle 159 is secured to or forms part of this body. A spaced longitudinal bar 160 set away from the body 157 and united therewith by legs 161 may be used as a handle.

A small flexible tubing 162 extends inside the hose throughout its length. The rear end of this tubing is connected by a coupling 163 to an interior boss 164 of the delivery conduit section 4, this boss being provided with a duct 165. A short tube 166 (Figs. 2 and 5) connects the duct 165 with a casting 167 secured by screws'168 to the outside of the delivery conduit section 4 The casting 167 comprises a more or less vertical hydraulic cylinder .169 and, above the cylinder, a reservoir 170. 1 In the hydraulic cylinder is a piston 171, which, as illustrated in Fig. 4, is hollow and has a stem 172 extending from its lower part. Immediately below the piston is a cup leather 173, which is held in place by a nut 174 threaded on the stem 172, a washer 175 being interposed between the nut and the cup leather. The lower end of the cylinder 169 is closed by a screw plug 176 and made air-tight by a gasket 177. The tube 166, as indicated in Fig. 5, is connected with the hydraulic cylinder 169 below the piston.

The reservoir 170 has a removable fill-plug 178. It may be noted that this plug is so situated as to permit of only a partial filling of the reservoir, this being in order to provide ample free space for upward movement of the piston. A small vent opening 179 permits the admission and escape of air as the piston is moved.

The oil in the reservoir and upper part of the cylinder serves as a supply for automatic-re- 'plenishmentof the liquid in the system, to make up for any loss by leakage or contraction. An opening 180 is formed through the piston and its depending stem.- The lower part of this opening is enlarged to accommodate a ball check-valve 181. In the inactive condition of the dispenser, the piston is in its lowermost position in the cylinder 169 and the stem 172 rests on the upper face of the screw 176. The lower portion of the stem is slotted as indicated at 182 in Figs. 7 and 8, to permit of the control liquid freely seeping past the ball-check and into the system. The ball is prevented from dropping out of the-hole by peening over the lower edge of the hole. As fluid pressure is forced into the cylinder 169 below its piston, v the ball-check will immediately close off the restricted opening 180 and the piston will .be raised to lift the valve member 147 as hereinafter described. 7

, If, however, the working body of liquid beneath the piston 171 and in the

lines

166 and 162 and in the hydraulic operating device at the nozzle, hereinafter described, should expand by reason or" heat, any excess in this working body will pass the check valve 181 freely, Without closing it, and be received in the reservoir space above the piston. Likewise, if there should be any air in this part of the hydraulic control system, it will escape through this passage.

' The top of the passage 186 is slotted as illustrated at 183 in Figs. 4 and 6. This slotting prevents the opening from being shut 011 by a thrust element 184, which is interposed between the piston and an arm 185 rigid with a rockshaft 186, which extends through tight bearing openings in the wall of the discharge conduit 4*. A spring 187 surrounding this thrust element 183 returns the piston to its normal position. Naturally, the spring 155 would act to perform the function, but the spring 187 gives further as surance that the piston will return.

The rock-shaft 186 also has an arm 188 (Fig. 2) in the interior of the section 4 This arm is rigid with the rock-shaft and is pivotally connected to a thrust rod 189 extending upwardly into a socket 190 in the down-stream side of the valve member 147. From the foregoing it will be apparent that the valve 147 will be moved in unison with the movement of the piston 171 in its cylinder 169.

A crank arm 191 is secured to the portion of the shaft 186 outside the conduit, on the opposite side of the conduit to that portion of the shaft bearing the arm 185. The crank arm 191 is pivotally connected to a rod 79 which extends rearward to the castingv 106, where it enters an enclosure formed between the casting and a cover plate (not shown). The rear end of the rod is loosely connected with the crank arm 88 on the rock-shaft 89, heretofore described. A turnbuckle 90 may be provided in the rod 79 for adjustment purposes.

The forward end of the flexible tubing 162 is secured by a coupling 192 to a fitting 193 fixed in a tubular member 194, the member 194 forming the hydraulic operating cylinder carried by the hollow body 157 at the nozzle end of the hose. This cylinder snugly fits a suitable opening in the body 157 adjacent the gasolene passage 158. Its forward end is flanged at 195 and a gasket 196 prevents leakage of gasolene.

Projecting through the forward flanged end of the cylinder 194 is a reduced extension of a plunger or piston, 197. This plunger is hollow, forming a reservoir 198 for operating liquid, and its forward end is closed by a removable screw 199 having a gasket under its head. The rear end of the plunger has a projecting stem 200 on a cup leather 201, which is secured by a washer 202 and a nut203 A spring 204 is interposed between the plunger-and the end fitting 193. This spring returns the plunger to its normal position as indicated in Fig. 9, this being the position the parts assume when the dispenser is idle. A gasket 205 is interposed between the flanged end 195 of the cylinder and a shoulder on the plunger.

The reservoir 198 contains a supply of operating liquid. This reservoir serves for automatic replenishment of operating liquid in this part of the system and for venting of air, if there is any in the system. There is a communication between the reservoir and the working chamber of the nozzle part of the hydraulic control system which is effective when the system is at rest. It preferably consists of a lateral port 206 through-the Wall of the reservoir and a short slot 207 cut in the inside wall of the cylinder past the usual position of the cup leather of the piston. In the inactive position of the plunger oil may flow from the reservoir into the system, and air may pass in the reverse direction, but immediately upon advancing the plunger the slot 207 is closed off and thefluid can not escape back into thereservoir.

Manually operable means are associated with the body for actuating the plunger. A rod 208 is slidably mounted on a boss formed on one of the legs 161. Secured to the forward end of the rod 208 is a flat bar 209. The lower portion of this flat bar bears against the end of the plunger. An opening 210 is provided in the bar to facilitate access to the screw 199, when it is desired to remove it in order to fill this part of the hydraulic control system.

The rear end of the rod 208 has a pin 211 which is engaged by the bifurcated end 212 of an operating lever 213. The operating lever is pivoted on a pin 214 and works in a slot 215 formed in one of the legs 161. When the operating lever 213 is depressed, the reservoir plunger will be advanced in its cylinder and force the fluid through the flexible tubing to perform the operations heretofore described. 7

It is desirable to provide means to hold the slightly open. I

valve'147 in a slightly open position. This permits the last-measured gallon or other quantity called for to pass the valve and facilitates the draining of the hose. For this purpose a spring-pressed catch 216 is provided. The catch may be in theform of a plunger mounted in one of the legs 161, its lower end engaging a notch 217 on the forward part of the rod 208. A spring 218 confined between a shoulder on this plunger and a set-screw 219 forces the plunger toward the rod. When the operating handle 213 is fully depressed, as shown in Fig. l,

the valve 147 is wide open. As the operating handle moves back toward the position of Fig. 9, the plunger 216 engages the notch 217 and prevents complete return of piston 197, thus holding thevalve 147 slightly open. The parts are so arranged that at the time when the outlet valve 147 is held cracked or partly open, the master valve 91 is closed. A slotted, or lostmotion, connection is provided at the pivot of the rod 79 and lever 88, or elsewhere, and a spring 60, or its equivalent, is used to close the master valve 91 when the conduit valve 147 is When it is desired to completely close thevalve 147, as for instance when the customers tank runs over, a lever 220 is manually pushed toward the bar 160. This lever is pivoted at 221 and is attached to the plunger by a pin 222, which operates in a slightly enlarged hole 223 in the plunger.

The hose must be replaced from time to time.

.To do this Without disturbing the hydraulic 'plunger assembly fastened to the tube 162. The

hose is then unscrewed from the discharge conduit fitting 4 and slid over the flexible tubing 162 and lower hydraulic assembly. The new hose will be installed in the reverse manner.

Briefly, the operation is as follows:

Figs. 2, 4 and 9 show the position of the parts when the dispenser is not in use. dispenser, the, attendant having inserted the nozzle in the customers tank presses the operating lever 213, thereby advancing the operating plunger 197 in its cylinder 194. The initial movementof the plunger closes the opening 207 and no hydraulic fluid can then escape from the Working system to this reservoir.

The hydraulic fluid displaced in the cylinder 194 is forced through the flexible tubing 162 and into the cylinder 169 under the piston 171. The ball check valve 181 closes, and piston 171 raises the thrust element 184, which in turn moves the arm 185 on the rock-shaft 186. Through the medium of lever 188 and thrust conduit 4? is opened. The flow of gasolene can be regulated by manipulating the operating lever 213, thereby opening the valve 147 more or less.

To start the connection 189 the valve 147 in the discharge 14s The adjustable rod 79 connected to crank-arm l9l on the rocker-shaft 186 opens the'master valve 91. This connection enables the master valve 91 and the outlet valve 147 of the dispenser to be synchronized with each other, causing the supply to the measuring dispenser to be approximately proportionate to the outflow through the valve 147. Suitable connections heretofore described cause the power-control organ 93 to start the motor and pump. However, if desired, the power control organ may be operated entirely by hand.

When the required amount of gasolene has been delivered to the customers tank, the operating handle is released and the parts move back toward their inactive positions. plunger 216 engages the notch 217 in the bar 208 to facilitate draining the hose and delivery of the last-measured gallon. As heretofore stated, the master valve 91 will be closed while the outlet valve 147 is still cracked, thus insuring no more gasolene being measured or delivered than is intended. The springs in the upper and lower cylinders insure the complete return of the pistons and relieve the system from any pressure. The supply of hydraulic fluid is automatically replenished and the venting of any possible air is accomplished as heretofore described.

Various other functions and advantages of the features of the invention have been pointed out and need not be repeated.

It will be apparent that the apparatus may be modified or altered by additions, omissions, substitutions, or re-arrangement, without departing from the spirit of the invention. The claims are intended to cover all the generic and specific features of the invention and all statements of scope which as a matter of language might be said to fall therebetween.

I claim:

1. In a liquid dispensing apparatus, a delivery hose, a body on the nozzle end of said hose, a remote valve controlling the flow of liquid to said hose, a manually operable device associated with said body, hydraulic means operable by said device to open and close said valve, and means for automatically replenishing the working body of liquid in said hydraulic means.

2. In a liquid dispensing apparatus, a delivery hose, a body on the nozzle end of said hose, a valve controlling the flow of liquid to said hose, a manually operable device associated with said body, hydraulic means operable by said device to open and close said valve, and means at both ends of said discharge hose for automatically replenishing the working body of liquid in said hydraulic means.

3. The combination with the delivery conduit of a dispenser and a hose connected therewith, of a body on the nozzle end of said hose, a valve in said delivery conduit, a manually operable device associated with said body, hydraulic means operable by said device and passing along said hose to operate said valve, and means for automatically replenishing the working body of liquid in said hydraulic means.

i. The combination with the delivery conduit of a dispenser and a hose connected therewith, of a body on the nozzle end of said hose, a valve in said delivery conduit, a manually operable device associated with said body, hydraulic means operable by said device and passing along said hose to operate said valve, means adjacent said delivery conduit for supplying fluid to said hy- The draulic means, and other means carried by said body for supplying fluid to said hydraulic means.

5. The combination with the delivery conduit of a dispenser, and a hose connected therewith, of a body on the nozzle end of said hose, a valve in said delivery conduit, a manually operable device associated with said body, a hydraulic cylinder carried by said body, a phinger in said cylinder, connections between said plunger and said manually operable device, and a flexible tubing connected to said cylinder and passing along the inside of said hose to transmit fluid ressure to operate said valve in said delivery conduit.

6. In a liquid dispenser, the combination with a delivery conduit and a hose connected therewith, of a body on the nozzle end of said hose, a valve in said deliv conduit, a hydraulic cylinder carried by said body, a plunger in said cylinder, a reservoir in said plunger, a passage between said reservoir and said hydraulic cylinder, manually operable means associated with said body for advancing said plunger in said cylinder, the advancing of said plunger causing said passage to be closed, and a flexible tubing connected to said cylinder and passing along said hose to transmit fluid pressure to operate said valve in said delivery conduit.

7. In a liquid dispenser, the combination with a delivery conduit and a hose connected therewith, of a body on the nozzle end of said hose, a valve in said delivery conduit, a hydraulic cylinder outside of said delivery conduit, a piston in said cylinder, motion transmitting means including a thrust pin cooperating with said piston to open the valve in the delivery conduit, means for closing said valve in the direction of flo'w, manually operable means associated with said nozzle body for setting up fluid pressure, and a flexible tubing to conduct the hydraulic fluid to said cylinder.

8. In a liquid dispenser, the combination with a delivery conduit and a hose connected therewith, of a body on the nozzle end of said hose, a valve in said delivery conduit, a hydraulic cylinder adjacent said delivery conduit, a piston in said cylinder, means operable by said piston to open the valve in the delivery conduit, a reservoir connected with and forming part of said hydraulic cylinder, a' passage to enable hydraulic fluid to flow from the reservoir past the piston, manually operable means associated with said body for setting up fluid pressure, and a flexible tubing to conduct the hydraulic fluid to said cylinder.

9. In a liquid dispenser, the combination with a delivery conduit and a hose connected therewith, of a body on the nozzle end of said hose, a valve in said delivery conduit, a hydraulic cylinder adjacent said delivery conduit, a piston in said cylinder, means operable by said piston to open the valve in the delivery conduit, a reservoir connected with and forming part of said hydraulic cylinder, a passage through said piston to permit hydraulic fluid to flow past said piston, a check valve in said passage, manually operable means associated with said body for setting up fluid pressure, and a flexible tubing to conduct the hydraulic fluid to said cylinder.

10. In a liquid dispenser, the combination with a delivery conduit and a hose connected therewith, of a body on the nozzle end of said hose, a valve in said delivery conduit, a hydraulic cylinder carried by said body, a plunger in said cylinder, a reservoir in said plunger, a

passage between said reservoir and said hydraulic cylinder, manually operable means associated with said body for advancing said plunger in said cylinder, the advancing of said plunger causing said passage to be closed, another hydraulic cylinder adjacent said delivery conduit, a piston in said cylinder, means operable by said piston to open the valve in the delivery conduit, and a flexible tubing connecting said cylinders to transmit fluid pressure.

l1. lhe combination with the delivery conduit of a dispenser and a hose connected therewith, of a body on the nozzle end of said hose, a valve in said delivery conduit, a manually operable device associated with said body, a hydraulic cylinder carried by said body, a plunger in said cylinder, connections between said plunger and said manually operable device, another hydraulic cylinder adjacent said delivery conduit, a piston in said cylinder, means operable by said piston to open the valve in the delivery conduit, a reservoir connected with and forming part of said second-mentioned cylinder, a passage to permit hydraulic fluid to flow from the reservoir past the piston, and a flexible tubing connecting said cylinders to transmit fluid pressure.

12. In a liquid dispenser, the combination with a delivery conduit and a hose connected therewith, of a body on the nozzle end of said hose, a valve in said delivery conduit, a hydraulic cylinder carried by said body, a plunger in said cylinder, a reservoir in said plunger, .a passage between said reservoir and said hydraulic cylinder, manually operable means associated with said body for advancing said plunger in said cylinder, the advancing of said plunger causing said passage to be closed, another'hydraulic cylinder adjacent said delivery conduit, a piston in said cylinder, means operable by said piston to open the valve in the delivery conduit, a reservoir connected with and forming part of said second mentioned cylinder, a passage to permit bydraulic fluid to flow from the reservoir past the piston, and a flexible tubing connecting said cylinders to transmit fluid pressure.

13. Hydraulic means for operating a valve in the delivery conduit of a liquid dispenser, said means comprising a hydraulic cylinder, a reservoir connected with said cylinder, a piston in said cylinder, a passage through which the hydraulic fluid may flow past the piston, a fillopening for said reservoir, said fill-opening being below the upper part of said reservoir, and means for supplying hydraulic pressure to said cylinder.

14. In a liquid dispenser having measuring means, a supply conduit, a delivery conduit, a hose connected with said delivery conduit, and a motor and pump for supplying liquid through said supply conduit to said measuring means, the combination of a master valve in said supply conduit, a shut-oif valve in said delivery conduit, a body connected with the nozzle end of said hose, a manually operable device associated with said body, a hydraulic cylinder carried by said body, a plunger in said cylinder capable of being reciprocated by said device, a flexible tubing connected to said cylinder and passing along said hose, another hydraulic cylinder connected to the other end of said flexible tubing, a piston in said cylinder, a lever supported in said delivery conduit below said shut-off valve, a thrust element interposed between said lever and said shut-01f valve, a shaft on which said lever is mounted, said shaft'passing through the.

wall of said conduit, motion-transmitting means between said piston to said shaft, a rod connected with the external portion of said shaft, and connections between said rod and said master valve to cause said master valve and said shut-off valve to move in unison with each other. 1

15. In a liquid dispenser having measuring means, asupply conduit, a delivery conduit, a hose connected with said delivery conduit, and a motor and pump for supplying liquid through said supply conduit to said measuring means, the combination of a power-control organ for said motor, a master valve in connection with said supply conduit, a shut-off valve in said delivery conduit, a body connected with the nozzle end or" said hose, a manually operable device associated with said body, hydraulically operated means controlled by said device .to open and close said shut-off valve, and motion transmitting connections between said shut-oil valve and said power-control organ and said master valve three elements to operate end of said hose, hydraulically operated means L controlled by said device to open and close said shut oif valve, and a releasable catch associated with said control device to hold said valve slightly open.

17. In a liquid dispenser having one or more control organs and a delivery hose, hydraulic control means comprising the combination of a hydraulic operating unit at the nozzle end of the hose, a subject unit at the dispenser, a flexible tube passing along the hose and connecting said units, and means for maintaining a constantvolume body of working liquid in said hydraulic means.

18. The combination with a liquid dispenser, a nozzle body, a hose detachably connected with the dispenser and with the nozzle body, a hydraulic control unit attached at the dispenser, a hydraulic control unit attached to the nozzle body, a flexible tube connecting said units, and located within the hose and detachable means for holding one of the control units in its support so that the hose can be replaced withoutbreaking the connection of the tube to either of the control units.

19. In a liquid dispenser, the combination of a discharge conduit; a hydraulic control unit for controlling the flow of liquid from the discharge conduit; a hose detachably connected with the discharge conduit; a nozzle body connected with the hose; a hydraulic operating unit attached to the nozzle body; a flexible tube within the hose and connected to both of the hydraulic units for the flow of liquid between said units; and means for detachably holding one of the hydraulic units in its support so that the hose can be replaced without opening the hydraulic circuit between said hydraulic units.

PAUL S. SHIELD.