US2193540A - Cooling installation - Google Patents

Description

March 12, 1940. H. E. scH uLsE COOLING INSTALLATION Original Filed July 1a, 1956 3 Sheets-Sheet 1 INVENTOR. Herman E. Sclzaise BY v QWwM- widxzamm ATTORNEYS.

March 12, 1940. SCHULSE 2,193,540

COOLING INSTALLATION I Original Filed July 18, 1936 3 Sheets-Sheet 2 [111. 5 INVENTOR. 7g HermanESchulse 2 09W? WMA v A TTORN E YS.

March 12, 1940.

H. SCHULSE coomne INSTALLATION Original Filed July 18 1936 3 Sheets-Sheet 3 INVENTOR. Herman E.Schulse A TTORNEYS.

Patented Mar. 12, 1940 UNITED STATES} PATENT OFFICE 2.19am coormor INSTALLATION Herman E. Schulse, Miami, Fla.

Application July 18, 1936, Serial No. 91,334

Renewed April 2, 1938 18 Claims. (0]. 62-141) My present invention relates to installations and equipment for circulating and controlling the operation of cooling fluid, and has particular application to a brew conditioning systemin which the brew is cooled in the original keg or barrel.

While the invention is applicable in other relations, it is particularly useful in connection with the installation and the performance of the method claimed in my copending application, Serial No. 759,440, filed December 28, 1934, issued as Patent No. 2,051,013 on August 11, 1936.

The equipment and apparatus for controlling the circulation and cooling of the present invention constitutes an improvement upon that disclosed in my prior application above identified and the present application is a continuation in part of said prior application.

Among the objects of the invention are to provide a circulating and controlling installation that may be readily set up as a fixture in the tap room, which is of compact and rugged construction which is made up largely of standard units of familiar construction and proved eflicacy including such standard elements as a compressor unit and expansion valve, thermostatically controlled valves and switches, and which operates reliably, economically and automatically to maintain the cooling fluid within the desired close limits of cooling effectiveness and in the particular application in which water is used as the cooling fluid, maintains the same between the desired close temperature limits, preferably, very slightly above the freezing point, and which isadaptable in small establishments with but a few kegs on the cooling line as well as for larger establishments with a considerably greater number of containers to be cooled and kept cool simultaneously.

Another object is to provide an installation of the above type in which derangement in the cooling system is automatically indicated and can not result in impairing the palatable condition of the brew in the containers, which brew may continue to be served therefrom in proper condition for a considerable period of time pending repair.

Another object is to provide an installation of the character set forth by which the circulation of the cooling fluid may be interrupted at will,

as for instance, when an empty barrel is to be disconnected and replaced by a full one, without substantial loss or leak of the cooling medium and by which substantial assurance is had that the circulation of such cooling medium is resumed after the fresh keg has been connected to the line.

tained and are readily accessible for inspection and service.

A feature of the invention is the installation comprising the cooling box and the headers extending therefrom, preferably horizontally along a wall of the tap room, through which the cooling fluid is circulated and from which the cooling fluid is pumped into heat conductive relation with the contents of the various brew kegs, desirably by releasably connecting the latter in parallel thereacross.

Another feature is the thermostatic control by 20 which the circuit to the electric motor which drives the pump that circulates the cooling medium, usually cold water, through the barrels or kegs, is interrupted either manually as for instance when a keg is to be replaced, or automatically as for instance, when the compressor should become deranged and the cooling water reach the uppermost permissible limit of temperature or when an excessive load is placed on said motor.

Another feature is the automatic control de- 80 sirably a temperature control, for interrupting the circuit of the compressor motor whenever the primary refrigerating medium reaches the lower limit of permissible temperature.

Another feature is the construction of the re- 35 frigerating unit with a heat insulated tank containing the refrigerating coil, with the various control apparatus in a narrow instrument compartment accessible from the front, with the a somewhat larger scale taken on line 4-4 of Fig. 3,

Fig. 5 is a plan view of the box shown in Fig. 4 with part of the cover removed,

Fig. 6 is a front elevation of the refrigerating box with the front panel and other parts removed to show the relation of certain of the elements thereof,

Fig. 7 is a detail sectional view on a larger scale taken on line '|-'I of Fig. 5,

Fig. 8 is a circuit diagram showing the approximate relation of the various electrical control elements with respect to the outline of the box or cabinet,-and Fig. 9 is a sectional view of a bypass plug connection detail.

While the invention herein claimed may be used in other relations, it is disclosed in Figs. 1 and 2 as it is applied in the brew cooling installation and method of my prior application above identified.

That installation in its general broad outlines includes a series of standard size transportation beer barrels, kegs or containers, of wood or metal, each having means associated therewith for cooling and maintaining at substantially dispensing temperature the beer oi other brew contained therein.

For this purpose, coolingfiuid, preferably water, is supplied from a source shown as the cabinet or box C adjacent the barrels through a pipe main 2!! and returned through a pipe main 2|. Both mains are enclosed in a common heat insulating jacket 22 extending the length of the installation and having a portion 23 on the cabinet C. Branches 24' and 24 of rubber, preferably jacketed with sponge rubber, tap the respective mains and are connected to the several beer barrels B, B B etc. to circulate the water in parallel into heat exchange relation with the enclosed brew, as for instance, through coils 25. The cabinet or box C has an overflow pipe I30 therein which determines the level of water in said tank and that level is shown as below that of the branch ends through which water is fed to the several containers.

The cooling water is pumped through the mains 20 and 2| and through the conduits of the various barrels in parallel, by a circulating system, both the propulsion and temperature of the water in which are automatically controlled from the cabinet C, to maintain the beer within each of the barrels at all times at substantially the correct dispensing temperature.

Accordingly, any of the barrels can be tapped directly to dispense beer to the consumer without further chilling outside of the barrel. For this purpose, as shown roughly in Fig. 1, the barrels B and B are shown tapped, each tap rod 25 having a faucet F at the upper end thereof and having gas pressure applied therethrough at 28 from gas conduit 29. The remaining barrels B etc. on the line are shown cooled, but in reserve until required to be tapped. A semi-circular drain pan 1) is preferably laid on each barrel on tap directly under the faucet spout.

The equipment constituting the cooling and control system which except for the conventional compressor and condenser unit U as shown contained'in the cabinet or box C, is shown in Figs. 3 130 7 inclusive. Said cabinet C includes a tank 30 for the cooling water in which a double helical refrigerating coil 3i is immersed.

The tank is heat insulated, desirably by resting it upon a slab 33 of pressed insulating cork upon sheet metal floor 34 of the box, and similar slabs of pressed insulating cork 35 fill the space between the side walls of the tank 30 and corresponding side walls or partitions 36 of the box.

Near the bottom of the tank is the water circulating pump 31, preferably of the centrifugal type, which has an axial inlet 38 communicating directly with the water in the tank and an outlet 39 rising therefrom and connected by means of a flexible hose 40 to the supply main 20, from which the circulating water re-enters the tank by way of return main 2|, which discharges into the top of the tank 30, at a level below the heads of the respective barrels. Preferably the connection between the water headers 20 and 2| of the tank is through a header elbow 44, removably attached to the top of the box and which may be altematively placed either or both at the right or left end of the cover depending on whether the headers are to extend from one or the other side of the cabinet.

The pump 31 is driven by an electric motor 46 preferably disposed under the floor of the cabinet which has legs 41. The motor is attached under said floor by means of any suitable bracket 48 used for ceiling mounting and is desirably rubber mounted to absorb vibration. Preferably this mount is of the familiar pivot character automatically to tighten the belt 49, by which torque is transmitted to the pump 31. The belt extends in front of the front wall or partition 36 of the box around the pump pulley 5|. As shown in the detail of Fig. '7, the pump bearing 52 rests in a liner 53 in the front wall of the box and is secured in place by a nut 55 upon its extremity, drawing the shoulder 45 thereon to compress a gasket 56 against the inner end thereof. The pump shaft 51 through said bearing and which mounts the pulley 5| is connected in leak-tight relation by means of a gland 58 thereabout. The various control elements are preferably located in the control compartment 59 in front of the wall 36 to which compartment access is readily had through door 60 in front.

The electric motor is operated continuously while the system is in service and as long as the water in the tank 30 is kept within the range of temperature permissible for cooling the brew. A control is, however, provided for automatically arresting the circulation of cooling water preferably by disconnecting the circuit of motor 46,

should the refrigerating system become derangedand the temperature of the cooling tank rise above the permissible maximum. At the same time a normally inactive signal apprises the operator of the defect. A desirable apparatus for this purpose comprises a thermostatically operated switch 6| in the control compartment, illustratively near the top thereof, which is operated from a thermostatic bulb 62 in the water tank. the stem of said bulb extending therefrom through bushing 63 in the front wall. As this switch is conventional, its details, need not be set forth. It is sufficient to state that by expansion of the fluid in the bulb, the switch is opened and upon subsequent contraction when the water again is sufficiently cold, the switch again closes circuit, so that the motor resumes operation. The bulb 62 is submerged in the water, so as to respond to its temperature. By this means the system is controlled, so that at no time will it pump water of temperature more than a predetermined maximum, preferably not greater than 10 degrees F. higher than the optimum temperature, which desirably is kept as close to the freezing point as possible.

The switch BI is preferably of a combination variety familiar to those skilled in the art, to respond not only to temperature, as noted, but also to open on overload and at will by manipulation. The manual operation is for the purpose of disconnecting the circulation of water as for instance, when an empty keg or barrel is to. be replaced. An electric signal desirably, a lamp 66 in the control cabinet and behind a window or bulls eye 61 in the door, apprises the attendant of the fact that the motor is not running, regardless whether this be due to thermostatic action, overload, or manual opening of switch 6!. Upon resetting the switch 6| through button 68, operation resumes after a manual or temporary overload disconnection, but the button is inoperative to close circuit until the expansion fluid in the thermostatic bulb has contracted after cooling to within the desired range.

In Fig. 8 is shown the circuit diagram, indicating the inter-relation between the combination thermostatic, overload and manual switch 6|, the motor 46 and the signal lamp 66. It is seen that the motor circuit from the mains m and m is closed through switch 6|, when the latter is closed, and that the terminals of the lamp 66 are short-circuited by said switch at common terminals 69 and 10 on the terminal block 1|.-

When the switch 6| is open, the signal lamp is energized from the mains by connection in series with the motor. As soon as the switch 6| recloses, whether by operation of the thermostat or by hand, the motor 46 resumes operation and the signal lamp goes out. It is, of course, understood that the signal may be a thermostatic flasher lamp, bell, buzzer or other indicator. The

brew in the barrels as well as the water in the pipes being at substantially dispensing temperature when the trouble signal registers, the attendant might despite the interruption of cooling circulation, continue serving brew in substantially perfect condition for a substantial period of time pending repair.

A desirable refrigeration cycle for keeping the cooling water in tank 36 at proper temperature involves a conventional compressor unit ordinarily disposed below the dispensing establishment, said unit including a reciprocating compressor 12 driven by belt 49' from an electric motor 46', said compressor feeding the refrigerant through a contiguous condenser coil 13, where the heat is removed by radiation. The refrigerant passes from the condenser 13 to receiver l9 thence through a small pipe 14 to the inlet of an expansion valve 16 and from the outlet 11 thereof to the refrigerating coil 3| in the cooling water tank 3|]. The return from the refrigerating coil 3| flows through the pipe 18 of larger diameter than inlet pipe 14 back to the compressor, in which the vapor is restored to the liquid condition and cooled in condenser I3, for repetition of the refrigerating cycle set forth.

The fiow of the refrigerant in the expansion coil is thermostatically modulated by means comprising a conventional thermostatic bulb 86 is held by clamp near the outlet of the refrig-v The expansion valve 16 used is a familiar piece of apparatus which when warm water is in the tank, as when it is initially set up for operation, operates substantially as a pressure relief .valve to permit effective and relatively rapid cooling. But when the water-approaches the temperature range for which the expansion valve is designed or adjusted, the pressure relief operation is modulated by the thermostatic action which then sets in. The circuit to the compressor motor 46', is interrupted when the temperature water in the tank falls too low, by a temperature control switch 82 in the control cabinet 59. Temperature controlled switch 82 is operated from a thermostatic bulb 83, clamped to the refrigerating coil. Upon opening of switch 82, the refrigerating cycle is interrupted and as the water becomes warmer than desired, the thermostatic fluid in bulb 83 again expands to cause switch 82 to reclose and motor 46' to resume operation. The fluid in bulb 80 also now expands to cause expansion valve 16 to reopen and permit refrigeration to resume.

As shown in the drawings, the various electrical control and auxiliary elements including the combination thermostatic, manual and overload switch 6l, the temperature control switch 82, the signal lamp 66, the terminal block H and the various electrical connecting conduits C therefor are located in the narrow instrument compartment 59, while the electric motor 46, of length greater than the depth of said compartment is disposed therebehind. v

The expansion valve is preferably mounted as shown, on the insulating cover ledge 84 of the compartment and is enclosed by sheet metal hood 85, the main insulating cover 81 in front of the hood being a separate element to afford ready access to the coil, while the expansion valve and connections thereto from the compressor are readily accessible by removal of the hood 85. The

coil and the expansion valve with their associated cover ledge 84 may readily be removed from the assembly as a single unit without interrupting the connection therebetween.

Preferably the tank is equipped with means to limit the level to which it can be filled with water. For this purpose, a nipple connection 86 protrudes through the floor of the box from the interior of the tank 30. To this nipple is connected a rubber hose which is releasably connected at its upper end to a clamp9| preferably in back of the tank or box, at the limiting level above which the water in the tank cannot rise, since it will overflow through the hose.

The upper end of the hose may be disconnected and its loose end lowered to permit draining the tank when desired.

Preferably the upper surface of the cover 81 is made of rust proof and stainless material to serve as a cutting board.

Switch 6| being thrown open preparatory to removing a barrel from the line, as for instance, for replacement, no cooling water is lost by pumping through the now open connections. By the release of the parts above described, substantially no water is lost from the system by gravity flow, since the return pipe 2| and the feed hose 40 of the tank 30 'both extend con siderably below the barrel heads, as does also the level of the water in tank 30. Accordingly, a siphoning action is exerted upon the now open pipe branch ends which are readily connected to the fresh barrel. It is preferable before connecting such fresh barrel in the cooling circuit to pour water over its head, which will fill the coolingcoil 65 thereof to compensate for the water remaining in the cooling pipe 25 of the empty barrel that was removed.

No air blocking occurs in the circulating system during replacement or at any other time, since a high resistance connection 92 between the supply and return mains and 2| obviates dead air pockets in the circulating system and thus assures air clearance.

If it is desired to operate the installation with less than the full number of kegs for which it has outlets, this can readily be done by connecting the inlet and outlet branch hoses that are not connected to a barrel, preferably through a high resistance fitting 88 (Fig. 9) having a restricted longitudinal passage 89 and tapped ends 89' to which the ends of the branch hose may be connected-by suitable union fittings.

The fitting 88 affords a resistance to flow, preferably of the order of that of the cooling coil of a barrel, so as not to short-circuit the cooling conduit of other barrels or kegs on the line. Instead of the fitting 88, a double ended imperforate plug of Bakelite, vulcanite or the like might be used to shut off the passage between the two hose branches across the mains.

The use of water as the cooling agent to be circulated through the brew barrels is preferred not only because of its negligible cost but because it has no corrosive or other deleterious action on the conduits of the barrels, and furthermore can be circulated under low pressure and so admits of the use of thin-walled tubing of correspondingly light weight and low cost. It is understood, however, that the invention embraces within its scope, as defined in certain of the claims, the use of any fluid cooling medium to be circulated through the brew barrel conduits, whether that medium be a brine or a vaporizable refrigerant and regardless by what means the heat be abstracted from the brine or other refrigerant after its has circulated through the barrels.

Iiaving thus described my invention, what I claim as new and desire to secure by Letters Patent of the United States is:

1. A cooling system of the character described comprising a cooling liquid tank, refrigerating means therefor, control means to maintain said liquid at a temperature within predetermined limits, a plurality of units to be cooled,

each of said units having a cooling conduit associated therewith, an electrically operated pump for circulating liquid from said tank in parallel through said several conduits, a thermostatically operated switch subjected to temperature in said tank and connected to interrupt the motor circuit should the cooling liquid become exces sively warm, thereby to preclude the circulation of warm water to the units, and an electric trouble signal connected automatically to register when the motor circuit is interrupted, and a hand switch for disconnecting the motor circuit at will and simultaneously connecting the signal when a unit is to be replaced.

2. A cooling system for maintaining beverage in individual containers at dispensing temperature, said system comprising water conduits in heat transfer relation with the beverage in the individual containers, a cooling liquid tank, a supply main leading therefrom, a return main delivering thereto, the conduits of the individual containers being connected in parallel across said mains, an electrically driven pump for circulating the supply water to effect the desired cooling of the beverage, mechanical refrigerating equipment maintaining the water in the reservoir between predetermined temperature limits, and a thermostatic switch having a control element subject to temperature in said tank, to automatically interrupt the motor circuit, thereby to prevent further circulation to the containers should the cooling water reach a temperature in excess of the permissible maximum.

3. A cooling system for maintaining a beverage in individual containers substantially at dispensing temperature, said system comprising water conduits in heat transfer relation with the beverage in the individual containers, a cooling water tank, a supply main leading therefrom, a return main delivering thereto, the conduits of the individual containers being connected in parallel across said mains, an electrically driven pump for circulating the cooling water to effect the desired cooling, mechanical refrigerating equipment maintaining the water in the tank between predetermined temperature limits, a thermostatic switch having a control element subject to temperature in said tank to automatically prevent further circulation of water from said tank should the same reach a temperature in excess of the permissible maximum, and a manual switch for interrupting the circulating motor circuit at will, as for the replacement of an empty container, said conduit system being constructed and arranged to preclude draining of water from the system when disconnecting a container therefrom.

4. A cooling system for maintaining beverage in individual containers substantially at dispensing temperature, said system comprising cold water conduits in' heat transfer relation with the beverage in the individual containers, a cooling liquid tank, a supply main. leading therefrom, a return main delivering thereto, the conduits of the individual containers being connected in parallel across said mains, an electrically driven pump for circulating cooling water to effect the desired cooling. mechanical refrigerating equipment maintaining the water in the reservoir between predetermined temperature limits, a thermostatic switch having a control element subject to temperature in said reservoir to automatically prevent further circulation of water from said reservoir should the same reach a temperature in excess of the permissible maximum, whereby the circulation of warm water through the beverage conduits in the event of a defect therein is precluded, a manual switch for interrupting the motor circuit at will, as for the replacement of an empty container, said cooling liquid tank having means limiting the water therein to a level below that of the connections to the several containers, said mains having their tank ends substantially below the branch ends of the respective containers, whereby upon interrupting the cooling circuit connections to any container, cooling liquid will be siphoned back to the tank and will not be lost.

5. In an installation of the type which includes a plurality of heat-insulating transportation containers, each of said containers equipped with a conduit therein in heat transfer relation to the contained liquid, a cooling Water ta k, a supply main feeding from said tank, a return main delivering to said tank, said several mains having branch connections releasably connecting the conduits of the several containers in parallel and means for circulating water from said tank through the mains and the cooling conduits; the combination of the releasable connections for the various conduits substantially above the tank ends of'the mains, and above the level of water in said tank.

6. In a circulating cooling system a cooling water tank, feed mains communicating therewith, a pump for circulating cooling water from said .tank through said mains, an electric motor for operating said pump, mechanical refrigerating equipment for chilling the tank water and including a refrigerant conduit and an electric compressor-driving motor, thermostatic control means for interrupting the compressor motor circuit when a predetermined temperature of the refrigerant is reached, and. thermostatic control means subjected to temperature in the cooling water tank for interrupting the circuit of the circulating pump motor, to discontinue water circulation, independently of the operation of the mechanical refrigerator when the temperature of the cooling water exceeds a predetermined value.

'7. A refrigerating cabinet having a cooling water tank, a control compartment along one wall of said tank, an electric motor, a pump shaft near the bottom of said tank and driven from said motor, a pump on said shaft and in said tank, having an output pipe extending to an outlet at the top of said cabinet, a refrigerating coil in said tank, a thermostatic bulb carried near the outlet thereof, an expansion valve governed by said thermostatic bulb, a second thermostatic bulb subjected to temperature in said tank, a thermostatic switch governed thereby and disposed in said control compartment, said switch controlling the circuit of said motor to interrupt circulation of cooling water should the temperature thereof become excessive.

8. A refrigerating cabinet comprising a heat insulated tank having a refrigerating coil therein, said cabinet having a control compartment in front of said tank, an electric motor under the floor of said tank behind said control compartment, a pump in said tank having a shaft extending through one of the heat insulated walls into said control compartment, a drive belt connecting said motor to said protruding pump shaft end, a water feed connection at the cover of said tank and a flexible hose connecting the outlet of said pump to said feed connection.

9. A refrigerating cabinet having a heat insulated tank therein for the cooling fluid, a refrigerating coil submerged in said tank, an insulating cover on said tank, a water pump submerged in said tank and a water header elbow unit mounted on said cover having means in cluding two ducts for connection respectively to a supply and to a return header, and a flexible hose connection within said tank between said pump and one of the ducts of said header.

10. A refrigerating cabinet having an elevated floor, a heat insulated tank thereon, a refrigerating coil within said tank, a control compartment in front of said tank, an electric motor below said fioor,'a pump within said tank, a driving belt connection between said motor and said pump extending into said control compartment, 8. cover ledge on said tank, an expansion valve mounted thereon and having a bulb connection through said cover ledge to said coil, a second bulb mounted on said coil, a temperature control valve in said control compartment operably connected to said second bulb and adapted to control the operation of a compressor for supplying the coil with primary refrigerant, a third bulb on said coil, a combination thermostatic, overload and manual switch in said control compartment operatively connected to said third bulb, and an electric indicator in said control compartment connected to register when said latter valve is in open position.

11. In a refrigerating cabinet, the combination of a heat insulated tank having a refrigerating coil therein, a heat insulated cover therefor comprising a rear ledge, an expansion valve mounted thereon and connected therethrough with respect to said coil, a header elbow member on said ledge, a motor operated pump within said tank and a conduit connecting said pump to said header.

12. A system for cooling the contents of individual containers, said system including conduits in heat transfer relation with said contents, a tank of cooling liquid, feed mains communicating with said tank, the conduits of the respective individual containers being releasably connected in parallel across said feed mains, means for circulating water from said tank through said mains, and a flow resisting passage connecting the outermost extremities of said mains and serving to preclude air-lock.

13. A system. for cooling the contents of individual containers, said system including conduits in heat transfer relation with said contents, a tank of cooling liquid, a supply main and a return main both communicating with said tank, the conduits of the respective individual containers being releasably connected in parallel across said mains, means for circulating water from said tank through said mains, the tank ends of said mains and the water level in said tank extending below the releasable connections to the containers, for exertion of a siphoning effect upon disconnection of any container and accordingly to preclude loss of water from the cooling water mains, and a high resistance flow conduit establishing a connection free from interference with the conduits of the several containers, to aid in expelling air that might otherwise become trapped in the circulating conduit.

14. In a circulating cooling system, a cooling water tank, feed means communicating therewith, a pump for circulating cooling water from said tank through said means, an electric motor for operating said pump, mechanical refrigerating equipment for chilling the tank water and including a refrigerant conduit in said tank and an electric compressor driving motor, thermostatic control means for interrupting the compressor motor circuit when a predetermined temperature of the refrigerant is reached and a combination overload and manual switch for interrupting the circuit of the circulating pump motor to discontinue water circulation independently of the operation of the mechanical refrigerating, equipment.

15. In a circulating cooling system, a cooling water tank, feed means communicating therewith, a pump for circulating cooling water from said tank through said means, mechanical refrigerating equipment for chilling the water and including a refrigerant coil in said tank, electric motor means for operating the refrigerating equipment and for operating the pump, and a combination thermostatic, overload and manual switch for controlling the circuit of said electric motor means.

16. In a circulating cooling system a cooling water tank, feed mains communicating therewith, a pump for circulating cooling water from said tank through said mains, an electric motor for operating said pump, mechanical refrigerating equipment for chilling the tank water and including a refrigerant coil in said tank and an electric compressor-driving motor, thermostatic control means for interrupting the compressor said tank through said mains, an electric motor for operating said pump, mechanical refrigerating equipment for chilling the tank water and including a refrigerant coil in said tank and an electric compressor-driving motor. thermostatic control means for interrupting the compressor motor circuit when a predetermined temperature of the refrigerant is reached, and means for automatically interrupting the circuit of the circulating pump motor to discontinue water circulation upon the occurrence of an abnormal condition.

18. A refrigerating cabinet having a heat insulated tank therein for the cooling fluid a refrigerating coil submerged in said tank, an insulating cover on said tank, a water pump submerged in and near the bottom of said tank, elbow connection means mounted on said cover, including two ducts for connection respectively to a supply and to a return header, and a conduit within said tank connectin said pump to one of said elbow ducts.

HERMAN E. SCHULSE.

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