US2373143A - Automatically controlled portable fuel pumping unit - Google Patents

Description

April 10,1945. D. SAMIRAN 2,373,143

AUTOMATICALLY CONTROLLED PORTABLEFUEL PUMPING UNIT Filed Jul 15, 1945 2 Sheets-Sheet 1 He. I

April 10, 1945. Q SAWRAN 2,373,143

' AUTOMATICALLY CONTROLLED PORTABLE FUEL PUMPING UNIT Filed July 13, 1943 2 Sheets-Sheet 2 INl/ENTDP 0,4140 SAM/Ev? yw f/ Patented Apr. 10, 1945 AUTOMATICALLY CONTROLLED PORTABLE FUEL PUMPING UNIT David Samiran, Osborn, Ohio Application July 13, 1943, Serial No, 494,553

(Granted under the act of March 3, 1883', as amended'April 30, 1928; 370 O. G. 757) 14 Claims.

The invention described herein may be manufactured and used by or for the Government for governmental purposes, without the payment to me of any royalty thereon.

This invention relates to fuel pumping apparatus, and particularly, to a power operated portable pumping unit for pumping liquid fuel from containers into the tanks or other reservoirs or receptacles of aircraft, or the like.

An object of the invention is to provide a unit of this kind with automatic control means, to the end that the user need not be in constant attendance when the device is pumping.

Another object of the invention is to provide when the tank being pumped into has become filled and will then transfer the sensation to the pumping unit, where appropriate controls are actuated, thereby to automatically cause discontinuance of pump operation.

Since it not infrequently happens that a certain amount of 'water accidentally gets into a container and settles to .the bottom, and must be avoided when pumping fuel from the container, cooperating means are provided for sensing the presence of such Water and transferring the sen sation to the pump, where proper control means are actuated to reduce pump effort until the difficulty may be remedied.

Since a pumping unit of this kind may frequently be required to operate where a source of electrical energy is not readily available, a relatively small internal combustion engine has been selected in the instant embodiment as a power source for operating the pump, the fuel for operating the engine being taken from the discharge side of the pump, a fuel pressure responsive means being provided for controlling the engine throttle and for disconnecting the drive between the engine and pump.

In the drawings, which are schematic eleva tional views showing 'an illustrative embodiment of the invention,

Fig. 1 is a view of the improved apparatus as it may appear either when the engine is at rest or is rotating, but with the pump unit drivably disconnected therefrom.

Fig. 2 is a view of the apparatus as it appears when the engine and pump units are manually connected, the engine throttle still being automatically retained in the idling position.

Fig. 3 shows the mechanism as it appears with the apparatus in action, the throttle automatically held open, and pumping conditions normal.

Fig. 4 shows-the automatic cooperation of the controls when a stratum of water is encountered in the fuel receptacle by the pump suction pipe.

Fig. 5 shows the action'of the controls when the tank which is being pumped into becomes filled to a predetermined-level.

Like reference characters refer to like parts throughout the several figures.

Referring now to the drawings, a small internal combustion engine It! is drivably connected to a pump i2 through a speed reducing gear unit M. The usual grooved pulley II is provided on the engine shaft for starting the engine. The gear unit It is contained within a housing I6 and comprises a brake drum 18, which is rotatable freely on the engine shaft 20 and has two horizontally extending studs 22 upon each of which are two pinions 24 and 26, which are joined together for unitary rotation and are freely rotatable on the studs. A pinion 28 on the pump shaft 20 meshes with the pinions, while the pinions 26 mesh with the internal gear 30011 the pump shaft 32.

Obviously, when the drum l 8 is not held against rotation, the rotation of the'engine shaft ZO-and pinion 28 will merely cause the pinions 24 and 2G to planitate in .the gear 30, thereby leaving the pump shaft nonrotative. Rotation of the pump shaft may be'had, however, by holding the drum I8 against rotation.

Asa means for holding the drum l8 against rotation, a control lever 34 is pivoted in the housing it at 36, and a link 38, hinged to the lower end of the lever at 40, has its own lower end hinged to the brake shoe 42 at 43. A detent ball it, actuated by a spring 46, is adapted to engage either the notch 48 when the upper end of the lever 34 is moved to the left for withdrawing the shoe 4?. from the drum it, or the notch 50 when the upper end of the lever is moved to the right for applying the shoe to the-drum. Movement of the upper end of the lever to the right, therefore, drivably connects the pump I2 to the engine in through the gear unit l4 while the movement to the left frees the pump from the engine.

The discharge side 52 of the pump 12 is rovided with a-conduit 54 for conveying fuel from the pump to the tank 56. A discharge nozzle 58 on the tank end of the conduit is of that type which may be inserted in the tank and opened manually by an opening means, as at 60, but

closes itself automatically by a float or similar closing means, as at 62, when the tank becomes filled with the liquid fuel, thus preventing overflowing of the tank. The valve 51 is of the clapper type hinged at 59, and is normally swung out of the path of the incoming fuel by the weight of the float 62 acting through the link 6| but is interposed in the path of the fuel when the float rises, whereupon the inertia of the flowing fuel closes the valve. It is noted that while closing of the valve 57 prevents further flow into the tank 56, the valve will not prevent drain-back of the fuel in the conduit 54 through the pump when the pump ceases rotation.

Such a discharge nozzle is shownand described in a copending application, Serial No. 480,162, filed March 23, 1943, andis therefore not separately-claimed herein, butonly in combination with instrumentalities which react to its closing The interiors of the casing 66 and conduit 54 are connected, as at 16.

The'control rod 1.2- has'anelongated slot I8. A pin 80 has its one end fast in the control lever 34 and the other end extending freely intothe s1ot.'I8. The outer end of the control rod 12 is hinged by the pin 82 to one free end of a bell crank 84. The middle of the bell crank is hinged by the pin 85 to a bracket 88 which extends upwardly from the intake pipe 90 of the engine I0. The other free end of the bell crank 84 is hinged by apin 92 to a link 94 which is connected to theend of. a. short arm 96, which operates the throttle 98. A carburetor I is keptsupplied with fuel by a smallpipe I02 which connects the carburetor to the discharge conduit 54.

age hole I33 may extend through the cover, or, if desired, the flap valve I32 itself may intentionally be made to leak slightly. A valve I34 is provided for closing the opening between the casing I22 and suction pipe I06, the valve being centrally secured to the diaphragm I28 and resilient- 1y held to its closed position by the spring I36. The valve I34 is guided to its seat by a hollow cylindrical portion I38, which fits the valve passage slidably, there being V shaped notches I40 cut through the wall of the cylinder whereby the capacity of the valve to pass air increases gradu- The suction side m4 of the pump I2 is provided with a pipe I06. which fits slidably intoanother pipe I08, whereby the bottom portions of con tainers I09 of different depthsmay be reached. A suction shutoff valve H0 at the lower end of the suction pipe is so arranged that its floatactuated valve I I2 is normally down and off its seat H4, whereby the valve is open' and fuel III may enter the openings H6 and pass upward through the suction pipe I08- The float II8, however, is so balanced that it will sink in the fuel but rise in water, whereby the valve stays open as long as there is no water, as at H3, in the bottom of the container from which the fuel is being pumped.

Such a suction shutoif valve is shown and described in my copending application, Serial No. 323,560, filed March 12,1940, and is therefore not separately claimed herein, but only in combinationwith other devices which are aifected by its opening and closing.

In the wall of the suction pipe I06, between the suction shutofi valve H0 and the pump I2, is a vent valve assembly I which comprises a casing I22, vented at I24, and a lid I26 with diaphragm I28 clampedv between the casing and lid. The cover. I26 has a small opening I30 which is covered bya spring actuated flap valve I32 biased for inflow into the-space enclosed between the cover and diaphragm. .An additional small leakally as the valve rises from its seat. The spring I36 is under sufficient initial stress to hold the valve I34 seated against the normal pumping suction in the pip I06.

.The apparatus shown may preferably be put into service in the following manner:

With the control lever 34 in the vertical or neutral position (see Fig. 1), whereby the gear unit I4 is inoperative to drivably connect the engine and pump units, the engine may be started in the usual manner by wrapping a cord around the pulley I I and pulling its free end.- By reference to Fig. 1, it will be seen that, when the pump is not connected to the engine, the absence of pressure in the control means 64 allows the control rod 72 to move to the extreme right end of its travel, and that, in this position of the control rod, the throttle valve 98 is held at the closed or idling position, which automaticallyprevents the engine from racing when it is running under zero load.

After the suction pipe I08 has been inserted in a container I09 and the discharge nozzle 58 placed in the filler opening of the tank 56 and opened by the manual means 60, the. control lever 34 may be manually moved to the right so as to cause the gear unit I4 to become operative to drivably connect the engine andapump units together.

Fig. 2 shows the apparatus right after the gear unit has been made effective, but before the pump has had time to build any pressure in the control means 64, whereby the throttle valve momentarily remains in the closed or engine-idling position.

However, .since thepump. speedily builds up a pressure in thecontrol means 64. the control rod I2 coincidentally moves to. thev left, against the resistance of the spring I4, to the position shown in Fig. 3, in which position the throttle is wide open and the apparatus is pumping at full capacity.

If, while the apparatus is operating at full capacity, as seen in "Fig. 3, the suction shutoff valve H0 is lowered sufliciently to encounter a stratum of water, as shown at H3 in the bottom of the container I09, the float IIB will rise and move the valve II2 against its seat II4, thereby, for the time being, preventing either fuel or water from being pumped.

When the suction shutoff valve IIO thus closes while the apparatus is. pumping, the vent valve I34 is drawn off its seat by. the suction of. the pump (see Fig. 4), air being thereby'drawn into the suction pipe I06 through the vent I24. Since the vent valve I34 is attached to the diaphragm I 28, inward movement ofthe vent valve flexes the diaphragm inwardly, which simultaneously draws air in through the flap valve I32 into the space between the lid I26 and diaphragm, I28. Almost instantly after opening of the valve I34, the air drawn in through the opening I24 passes through the pump, whereby the pressure in the control means 64 drops, which allows the spring I4 to move the control rod 12 to the right and back to the position which it previously occupied in Fig. 2, where thepump remains connected through the gear unit H, but the throttle valve 98 is closed, bringing the engine down to idling speed, at which speed it may continue to run while the suction shutoff valve Ilfl remains closed by the water and the pump is pumping air in through the vent unit I 20. However, since the carburetor I is supplied with fuel through a. small pipe I02 from the discharge pipe 54,

and the discharge pipe now contains air only,

the engine will operate no longer than'it takes to consume the small amount of fuel in the carburetor even though the attendant neglects to raise the suction shutoff valve assembly H0 out of the water stratum.

Ordinarily, however, the attendant will notice. that the enginehas dropped to idling speed and will raise the suction pipe I08 until the suction shutoff valve assembly H0 is above the water level, whereupon fuel III will again flow up the suction pipe mil-405 to the pump, and the spring I36 will seat the vent valve I34. The slow leakage of'a-ir through the small hole I33 allows the air in the space between the lid I26 and the diaphragm I28 to escape slowly, whereby the vent valve is prevented from seating with too much shock, and is also prevented from chattering.

When the suction shutoff valve is raised out of the stratum of water, the apparatus reassumes the condition shown in Fig. 3, that is, the full operating condition, which will likely not be further disturbed until the tank 56 has been pumped full or until the container I09 has been emptied.

When the tank 56' becomes full to a. predetermined level, the float 62 rises and shifts the check valve 51 into the path of the flowing fuel, whereupon the check valve is closed. The

pressure now almost instantly rises in the con-.

trol means 64 above normal and moves the control rod 12 enough farther to the left (see Fig. from the normal positions of Fig. 3 to cause the right end of the slot 78 to push on the pin 80 and move the control lever 34 back to the vertical position shown in Fig. 1, whereby the pump is drivably disconnected from the engine. through the gear unit 14.

When rotation of the pump is thus discon' tinned, the almost instantaneous drop in pressure in the controlmeans 64, permits the control rod 12 to quickly move to the extreme right and close the throttle valve 98, thereby bringing the engine down to its idling speed, at which speed it may continue to rotate until the small amount of fuel in the carburetor I 00 is consumed, or until the engine is manually shut off.

while a single exemplification of my apparatus has been herein shown and described, it will. of course, be understood that many modifications may be made within the spirit of the invention, as for instance, the engine and pump may be connected by a friction clutch which may be operated by the control lever 34, the power being transmitted from the engine unit to the pump unit through gearing or directly, as may be indicated by the relative rotation of the engine and pump. I

Likewise, while several diaphragms are employed in the automatic controls for translating pressure into movement, pistons may be substituted under certain conditions for the same purpose. i

So also, while the embodiment disclosed includes shutoff means in both the suction and the discharge conduit, to eitherof which the controls respond automatically, it will readily be recognized that a pump of the character shown would have considerable merit if but one of these pipes contained a shutoff means to which the controls were arranged to respond.

Having thus described an embodiment of my invention, in which the objects hereinbefore set forth are attained, I claim:

1. In a device for pumping fuel from a container into a tank, the combination of an intern-a1 combustion engine, a carburetor and a throttle for said engine, a pump, a suction pipe and a discharge conduit for said pump, a carburetor supply pipe connecting the discharge conduit to the carburetor; a suction shutoff valve at the free end of said suction pipe, a float adapted to rise and close said suction shutoff valve when said float is emrersed in water, a vent valve in said suction pipe intermediate the suction shutoff valve and the'pump, adapted for inflow of air into said suction pipe when said suction shutoff valve is closed, a dashpot means for controlling closing of said vent valve, a discharge nozzle on the free end of said discharge conduit, a dischargeshutofi valve in said nozzle, 21. float for closing said discharge shutoff valve whenthe fuel in said tank reaches a predetermined level, power transmitting means for drivably connecting or disconnecting the pump to the engine, a control lever actuable to a disconnecting or a connecting position to place said power transmitting means in the disconnected or the connected state, detent means for releasably holding said control lever in one or the other of its positions, and a pressure responsive control means in pressure communication with said discharge conduit for moving said control lever and said throttle, means operative by said control means with subnormal pressure in said discharge conduit to hold said throttle in the engine idling position, with normal pressure in said discharge conduit to hold said throttle in the full open position, and with supernormal pressure in said discharge conduit to move said control lever to'the disconnecting position. 1

- 2. In a device for pumping fuel from'a container into a tank, the combination of an internal combustion engine, a carburetor and a throttle for said engine, a pump, a suction pipe and a discharge conduit for said pump, a carburetor supply pipe connecting the discharge conduit to the carburetor, a suction shutoff valve at the free end of said suction pipe, a float adapted to rise and close said suction shutoff valve when said float is emersed in water, a vent valve in said suction pipe intermediate the suction shutoff valve and the pump, adapted for inflow of air into said suction pipe when said suction shutoff valve is closed, a dashpot means for controlling closing of said vent valve, a dischargenozzle on the free end of said discharge conduit, a discharge shut off valve in said nozzle, a float'for closing said means including means operative by subnormal pressure insaid discharge conduit, to hold said throttle in the engine idling position, operative by normal pressure in said discharge conduit to hold said throttle in the full open position, and operative by supernormal pressure in said discharge conduit to move said control lever to the disconnecting position.

3. In a device for pumping fuel from a container into a, tank, the combination of an internal combustion engine, a carburetor and a throttle for said engine, a pump, a suction pipe and a discharge conduit for said pump, a carburetor supply pipe connecting the discharge conduit to the carburetor, a suction shutoff valve at the free end of said-suction pipe, a float adapted to rise and close said suction shutoff valve when said float is emersed in water, a vent valve in said suction pipe intermediate the suction shutoff valve and the pump, adapted for inflow of air into said suction pipe when said suction shutoff valve is closed, a discharge nozzle on the free end of said discharge conduit, a discharge shutoff valve in said nozzle, a float for closing said discharge shutoff valve when the fuel in said tank reaches a predetermined level, power transmitting means for drivably connecting or disconnecting the pump to the engine, a control lever actuable to a disconnecting or a connectingposition to place said power transmitting means in the disconnected or the connected state, resilient means for releasably holding said control lever in one or the other of its positions, and a pressure responsive control means associated with said discharge conduit, including means operative by subnormal pressure in said discharge conduit, to hold said throttle in the engine idling position, operative by normal pressure in said discharge conduit to hold said throttle in the full open position, and operative by supernormal pressure in said discharge conduit to move'said control lever to the disconnecting position.

4, In a device for pumping fuel from a container into a tank, the combination of an internal combustion engine, a carburetor and a throttle for said engine, a pump, a suction pipe and a discharge conduit for said pump, a carburetor supply pipe connecting the discharge conduit to the carburetor, a suction shutoff valve at the free end of said suction pipe, a float adapted to rise and close said suction shutoff valve when said float is emersed in water, a vent valve in saidsuction pipe intermediate the suction shutoff valve and the pump, adapted for inflow of air into said suction pipe when said suction shutoff valve is closed, a discharge nozzle on the free end of said discharge conduit, a discharge shutoff valve in said nozzle, a float for closing said discharge shutoff valve when the fuel in said tank reaches predetermined level, power transmitting means for drivably connecting or disconnecting the pump to the engine, a control lever actuable to a disconnecting or a connecting position to place said power transmitting means in the disconnected or the connected state, a pressure responsive control mechanism associated with said discharge conduit operative by subnormal pressure in said discharge conduit, to hold said throttle in the engine idling position, operative by normal pressure in said discharge conduit to hold said throttle in the full open position, and operative bysupernorrnal pressure in said discharge conduit to move said control lever to the disconnectingpcsition.

5. In a device for pumping fuel from a con- .tainer into a tank; thecombination of an internal'combustion engine, a carburetor and ath'rottle for said engine, a-pump, "a suction pipeand a discharge conduit'for said pump, a carburetor supply pipe connecting the discharge'conduit to the carburetor, a suction shutoff valve at th'e free end of said suction pipe, means adapted to close said suction shutoff valve when said means encounters water, a vent valve in said suction pipe intermediate the suction shutoff valve and the pump, adapted for inflow of air into said suctionpipe when'said suction shutoff valve is closed, adischarge nozzle on the free end of said discharge conduit, a discharge shutoff valve in said nozzle, a float for closing said discharge shutoff valve when the'fuel in said tank reaches a predetermined level, power transmitting means for drivably connecting or disconnecting the pump to the engine, a control lever'actuable to a disconnecting or a connecting position to place said power transmitting means in the disconnected or the connectedsta'te, and a pressure responsive controlmechanism associated with said discharge conduit operative bysubnormal pressure in said discharge conduit, to hold said throttle in the'engine idling position, operative by normal pressure in said discharge conduit to hold said throttle in the full open position, and operative by supernormal pressure in said discharge conduit to move said control lever to the disconnecting position.

6. In a device for pumping fuel from a container into a tank, the combination of an internal combustion engine, a carburetor and a throttle for said engine, a pump, a suction pipe and a discharge conduit for said pump, a carburetor supply pipe connecting the discharge conduit to the carburetor, a suction shutoff valve at the free end of said suction pipe, a float adapted to rise and close said suction shutoff valve when said float is emersed in water, a vent valve in said suction pipe intermediate the suction shutoff valve and the pump, adapted for inflow of air into said suction pipe whe said suction shutoff valve is closed, a discharge nozzle on the free end of said discharge conduit, a discharge shutoff valve mechanism in said nozzle, adapted to close when the fuel in said tank reaches a predetermined level, power transmitting means for drivably connecting or disconnecting the pump to the engine, a control lever actuable to a disconnecting or a connecting position to, place said power transmitting means in thedisconnected or the connected state, and a pressure responsive control mechanism associated with said discharge conduit operativc by sub-normal pressure i said discharge conduit, to hold said throttle in the engine idling position, operative by' normal pressure in said discharge conduit to hold said throttle in the full open position, and operative by supernormal pressure in saiddischarge conduit to move said control lever to the disconnecting position.

7.' In a device for pumping fuel from a container into a tank, the combination of an interrial combustion engine, carburetor and a throttle for said engine,a'pump, a suction pipe and a discharge'conduit for'said pump, a carburetor supcharge nozzle o'n thefree end of said discharge conduit, a discharge shutofl valve mechanism in said nozzle, adapted to close when the fuel in said tank reaches a predetermined level, power transmitting means for drivably connecting or disconnecting the pump to the engine, a control lever actuable to a disconnecting or a connecting position to place said power transmitting means in the disconnected or the connected state, and a pressure responsive control mechanism associated with said discharge conduit operative by subnormal pressure in'said discharge conduit, to hold said throttle in the engine idling position, operative by normal pressure in said discharge conduit to hold said throttle in the full open position, and

operative by supernormal pressure in said dis-' charge conduit to move said control lever to the disconnecting position.

8. In a device for pumping fuel from a container into a tank, the combination of an internal combustion engine, a carburetor and a throttle for said engine, a pump, a suction pipe and a discharge conduit ior said pump, a carburetor supply pipe connecting the discharge conduit to the carburetor, a suction shutoff valve at the free end of said suction pipe, means adapted to close said suction shutoff valve when said means encounters water, a vent valve in said suction pipe intermediate the suction shutoff valveand the pump, adapted forinfiow of air into said suction pipe when said suction shutoii valve is closed, a discharge nozzle on the free end of said discharge conduit, a discharge shutoff valve mechanism in said nozzle, adapted to close when the fuel in said tank reaches'a predetermined level, power transmitting means for drivably connecting or disconnecting the pump to the engine, .a control means operable manually to place said power transmitting means in the connected state, and a pressure responsive control mechanism associated with said discharge conduit operative by subnormal pressure in said discharge conduit, to hold said throttle in the engine idling position, operative by normal pressure in said discharge conduit to hold said throttle in the full open position, and operaive by supernormal pressure in said discharge conduit to move said manually operated control meansto the disconnecting position.

9. In a device for pumping fuel from a container into a receptacle, the combination of an internal combustion engine, a'carburetor and 'a throttle for said engine, a pump, a suction pipe and a discharge conduit for said pump, a suction shutofi valve at the free end of said suction pipe, means adapted to close said suction shutoff valve when said means encounters water, a vent valve in said suction pipe, intermediate the suction shutcii valve and the pump, adapted for inflow of air into said suction pipe when said suction shutofi' valve is closed, a discharge nozzle of the .free end of said discharge conduit, a discharge shutoff valve mechanism in said nozzle, adapted to close when the fuel in said receptacle reaches a predetermined level, power transmitting means for drivably connecting or disconnecting the pump to the engine, a control means operable manually to place said power transmitting means in the connected state, and a pressure responsive control mechanism associated with said discharge conduit operative by subnormal pressure in said discharge conduit, to hold said throttle in the engine idling position, operative by normal pressure in said discharge conduit to hold said throttle in the full open position, and operative by supernormal pressure in said discharge conduit to move 10. In a device for pumping fuel from a container, the combination of an internal combus tion'engine, a carburetor and a throttle for said engine, a pump, a suction pipe and a discharge conduit for said pump, .a carburetor supply pipe connecting the discharge conduit to the carburetor, a suction shutofi valve at the free end of said suction pipe, means adapted to close said suction shutofi valve when said means encounters Water, a vent valve in, said suction pipe intermediate the suction shutoff valve and the pump, adapted for inflow of air into said suction pipe when said suction shutoff valve is closed, power transmitting means for drivably connecting or disconnecting the pump to the engine, a control means operable manually to place said power transmitting means in the connected state, and a pressure responsive control mechanism associated with said discharge conduit operative by subnormal pressure in said discharge conduit, to hold said throttle in the engine idling position, and operative by normal pumping pressure in said discharge conduit to hold said throttle in the full open position.

11. In a device for pumping fuel from a container, the combination of an internal combustion engine, a throttle for said engine, a pump, a suction pipe and a discharge conduit for said pump, a suction shutoff valve at the free end of said suction pipe, means adapted to close said suction shutoff valve when said means encounters water, a vent valve in said suction pipe intermediatee the suction shutoff valve and the pump, adapted for inflow of air into said suction pipe when said suction shutoff valve is closed, means drivably connecting the engine and pump, and a pressure responsive control mechanism associated with said discharge conduit operative, when the pressure in said discharge conduit is less than the normal pumping pressure, to hold said throttle in the engine idling position, and operative by normal pumping pressure in said discharge conduit to hold said throttle in the full open position.

12. In a device for pumping liquid from a container into a receptacle, the combination of an internal combustion engine, a carburetor and a throttle for said engine, a pump, a suction pipe and a discharge conduit for said pump, a carburetor supply pipe connecting the discharge conduit to the carburetor, a discharge nozzle on the free end of said discharge conduit, a discharge shutoff valve mechanism in said nozzle, adapted to close when the fuel in said receptacle reaches a predetermined level, power transmitting means for drivably connecting or disconnecting the pump to the engine, a control means operable manually to place said power transmitting means in the connected state, and a pressure responsive control mechanism associated with said discharge conduit operative, when the pressure in said discharge conduit is less than the normal pumping pressure, to hold said throttle in the engine idling position, operative by normal pumping pressure in said discharge conduit to hold said throttle in the full open position, and operative by supernormal pressure in said discharge conduit to move said manually operated control means to the disconnecting position.

13. In a device for pumping liquid from a, container, the combination of an internal combustion engine, a throttle for said engine, a pump, drive means connecting the engine and pump, a

side drains: backwardly through the pumpwhen said' pump-is not driven, a pressure. responsive means. associated with the discharge side of said pump operative by supernormal pressure in said discharge side to drivably disconnect said pump from said engine, a carburetor for said engine having a small reserve reservoir capable of oper.-; ating said engine a. limited time after its source of supply is interrupted, and conduit means for.

maintaining said reservoir filled from said dise. charge side While said pump is operating.

DAVID SAMIRAM;

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