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Publication numberUS2478814 A
Publication typeGrant
Publication dateAug 9, 1949
Filing dateAug 26, 1941
Priority dateJun 10, 1936
Publication numberUS 2478814 A, US 2478814A, US-A-2478814, US2478814 A, US2478814A
InventorsDonald K Ferris
Original AssigneeGen Motors Corp
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Washing machine having automatically operated siphons
US 2478814 A
Abstract  available in
Images(5)
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Claims  available in
Description  (OCR text may contain errors)

I D. K. 'FERRIS 2,478,814: I WASHING MACHINE HAVING AUTOMATICALLY Y A OPERATED SIPHONS Original Filed June 10, 1936 5 Sheets-Sheet 1 I INVENTOR- T T J 5 -.1-&-

D. K. FERRIS WASHING MACHINE HAVING AUTOMATICALLY OPERATED S IPHONS Aug. 9, 194 9.

Origihal Filed June 10, 1936 5 Sheets-She et s 0. K. FERRIS WASHING MACHINE HAVING AUTOMATICALLY OPERATED SIPHONS IL- as 6/ z 7 w I Aug. 9, 1949.

Original Fi1ed June 10, 1936 I IIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIII/IIIIIIIIIIIIII a I a L A d f D. K. FERRIS -WASH ING MACHINE-HAVING AUTOMATICALLY OPERATED SIPHONS Original Filed Jfine '10. 1936 ,Aua- 4 D. K. FERRIS T i 2,478,814

WASHING MACHINE HAVING AUTOMAQICALLY OPERATED SIPHONS I Original FiledJune 10, 1936 5 She ets-Sheet 5 WATER I 5H DRAIN HOT MOTOR ON DRAIN cLoaeo--- DRAIN cow wmen PRE- WA6H v-- WA Patented Aug. 9, 1949 WASHING MACHINE HAVING AUTOMATI- CALLY OPERATED SIPHONS Donald K. Ferris, Dayton,'0hio, assignor to General Motors Corporation, Dayton, Ohio, a corporation of Delaware Original application Jnne'10, 1936, Serial No.

Divided and this application August 26, 1941, Serial No. 408,361

16 Claims. (Cl. 134-57) The present invention relates to apparatus for washing articles and has for its object to provide improvements in apparatus of this characterwhereby to simplify the construction and to reduce the cost of manufacturing the same.

This application is a division of application Serial No. 84,504, filed June 10, 1936, and now Patent Number 2,314,332, granted March 23, 1943.v

A further object of the invention is to provide improved apparatus of this class, particularly adapted for use in the washing of dishes and other articles and including an improved arrangement of electrical devices for heating and contrcllini, the flow of the washing and rinsing fluid.

A further object of the invention is to provide an improved liquid heating unit embodying a container or receptacle for the liquid having electric heating means for generating steam and means by which to control and employ the steam to vary the level of the liquid and to control and effect discharge of the liquid from the unit.

A further object of the invention is to provide an improved arrangement of electric heating and circuit controlling devices within the liquid holding receptacles under the control of the liquid and adapted to operate or function in a predetermined timed relation to insure delivery of the heated washing and rinsing supplies of water to the washing chamber at proper intervals and at the desired temperatures.

'A further object of the invention isto provide in a machine of the class described, a washing chamber and individual compartments for supplying pre-washing, washing, and rinsing liquids thereto with electrical devices for generating steam in the compartments containing the washing and rinsing liquids to effect discharge of the liquid therefrom at predetermined intervals, and in which apparatus electrical devices are also provided for circulating the liquid within the washing chamber and for controlling the drain passage leading therefrom, said electrical devices operating automatically in a predetermined sequence to successfully complete the required operations.

A further object of the invention is to provide receptacles in which to heat the washing and rinsing liquids and one or more heating devices in each of the receptacles for heating the liquid as well as for the purpose of generating steam to provide pressure within the receptacles sum cient to effect discharge of the liquid to the A washing chamber, and also to provide means for 2 varying the position of the heating device or devices relative to the level of the liquid in order to be able to vary the period required to effect the discharge of the liquid from each receptacle and to make it possible to be able to better control the intervals of discharge of the liquid from the several receptacles and the temperatures at which the liquid is supplied to the washing chamber.

A further object of the invention is to provide an improved apparatus for washing dishes by which the food particles adhering thereto can be effectively removed and the dishes rinsed and dried within the washing chamber in an eflicient and economical manner.

A further object of the invention is to provide an improved apparatus for heating the washing liquid, effecting its delivery to the washing chamber, and automatically controlling the operations of circulating it therein and discharging it therefrom.

A further object of the invention is to provide an improved apparatus for heating water in a plurality of receptacles for washing and rinsing the dishes, discharging it from the receptacles to the washing chamber at predetermined intervals and controlling the operations of washing and rinsing the dishes and of the discharge of the water from the washing chamber in a predetermined sequence.

To these and other ends the invention resides in certain improvements and combinations of parts, all as will be hereinafter more fully described, the novel'features being pointed out in the claims at the end of the specification.

In the drawings:

Fig. 1 is a sectional elevation of a washing machine embodying one form of the invention;

Fig. 2 is a fragmentary sectional elevation on line 2-2 of Fig. 3;

Fig. 3 is a, front elevation as viewed from the right of Fig. 2;

Fig. 4 is a sectional plan taken substantially on line 4-4 of Fig. 2;

Fig. 5 is a fragmentary through the receptacle containing the rinse wa- Fig. 6 is a plan view illustrating the manner of constructing the switch and heating units for controlling and heating the liquid;

Fig. 7 is a sectional elevation on line 'l| of Flg. 6;

Fig. 8 is an enlarged sectional elevation on line 8-8 of Fig. 6;

sectional elevation Fig. 9 is a top plan view of a slightly modified form of heating unit;

Fig. 10 is a sectional elevation taken on line Ill-ill of Fig. 9;

Fig. 11 is a fragmentary sectional elevation i1- lustrating the latch mechanism for securing the cover for the washing chamber in closed position with the magnet for releasing the latch shown in normal deenergized position;

Fig. 12 is a similar view showing the armature of the magnet in position to effect release of the latch when the armature becomes deenergized;

Fig. 13 is a part sectional elevation illustrating the drain for the dish washing chamber and associated parts;

Fig. 14 is a similar view showing the drain valve in closed position;

Fig. 15 is a diagrammatic view showing the electrical devices and the circuit connections therefor;

Fig. 16 is a plan view of one of the hinges for raising the cover of the machine when the latching means therefor is released;

Fig. 17 is a transverse sectional elevation through the hinge shown in Fig. 16;

Fig. 18 is a view in elevation of a modified form of the invention;

Fig. 19 is a sectional elevation of another modification; and

Fig. 20 is a diagrammatic representation of a portion of the machine.

The same reference numerals throughout the several Views indicate the same parts.

The present invention embodies generally, liquid heating apparatus in which steam is generated in a receptacle containing the liquid by means of a suitable heating device such, for example, as an electric heater of any preferred type. The steam is collected and controlled in such a manner 'as to exert pressure on the liquid sufiicient to force it downwardly through a suitable outlet or to raise it to a predetermined level for discharge from the receptacle at a point above the normal level of the liquid. A siphon is preferably employed for withdrawing the heated liquid from the receptacle for discharge to any desired point when raising the level of the liquid, as distinguished from forcing it downwardly within the receptacle. The siphon will begin operation after the water has reached the boiling point and sufficient steam has been generated to exert pressurev on the liquid to raise it to the required level.

When the apparatus is to be used for heating water for dish washing purposes it can be directly associated with a dish washing machine of any suitable design, such, for example, as that shown in Fig. 1. In this case three receptacles are employed for receiving the pre-wash, the wash, and the rinsing water; respectively, the pro-wash water being discharged directly to the dish-washing chamber. The electric heating and circuit control devices within the receptacles containing the washing and rinsing water are so designed and related as to function or operate in a predetermined sequence whereby to effect heating and delivery of the washing and rinsing water to the dish-washing chamber at predetermined intervals, the rinsing water being delivered thereto as soon as the main supply of wash water has been discharged therefrom. In other words, the apparatus is so designed that it is only necessary to place the dishes and a suitable detergent within the washing chamber and the water within the different receptacles provided, the operatlons thereafter being automatic, the motor circuit being closed by the water to start the motor for driving the impeller whereby to circulate the water within the dish washing chamber. Furthermore, the drain valve for controlling the discharge of the waste water is automatically opened and closed at proper intervals and the latch for maintaining the cover for the dish washing chamber in closed position is automatically released to allow the cover to swing to open position as soon as the final rinsing operation is completed.

Referring to the drawings, i0 represents the outer casing of the machine having top and bottom frame members Ii and I2, respectively, to which the side walls of the casing are attached, the frame member ll carrying the end wall Ila of the receptacle. Suitably supported within the casing is the washing machine proper, designated generally by the reference numeral i3 and comprising a container having a washing chamber H into which extends an impeller i5 for circulating and discharging the washing fluid in 'contact with the dishes i6 supported by any suitable means, such as the rack l1 shown in Fig. l. The impeller is mounted on the shaft of an electric motor I8, suitably connected with the lower end of the container i3. The container has a drain pipe 19 extending therefrom which is provided at its outer end with a valve 20 for closing the outlet 2|, the valve being normally held in open position by a spring 22 and closed by an electro-magnet 23 included in the motor circuit and operated as described hereinafter.

Surrounding the drain pipe 19 is a heating coil 24 for warming the water contained within the pipe, the coil being in the form of an adjustable resistance for controlling or regulating the flow of the current, as more fully described hereinafter.

Disposed within the casing i0 is a tank 25 for receiving the waste water discharging from the drain pipe when the valve 20 is opened, the tank being removably supported on guides 26 suitably connected with and supported by the casing i0.

Separate tanks or receptacles are provided for the pre-wash, wash, and rinsing water, these being designated by reference numerals 27, 28, and 29, respectively, the receptacle 2.! having a small compartment 30 disposed thierebrneath through which the rinse water is by-passed on its way to the washing chamber for a purpose described hereinafter. The receptacles or compartments 21 to 30, inclusive, are preferably formed of metal and may, if desired, be constructed as a unit and secured to the front, rear and end walls 31, 32, and 33, respectively, which are disposed within the casin i0 and formed of suitable insulating material.

A measuring tank or receptacle 34 is provided for measuring the water to be delivered to the compartments 21, 28, and 29, said receptacle being supported for a swinging movement from the horizontal position shown in Fig. 2 to the vertical position shown in Figs. 1 and 5 by a plurality of hinges 35 which connect the tank with the front wall of the casing Ill. The measuring tank has three compartments 21a, 28a and 29a for measuring the pro-wash, the wash and the rinsing liquids for discharge respectively to the receptacles 21, 28, and 29 upon swinging the measuring receptacle from the horizontal position shown in Fig. 2 to the vertical position shown in Fig. 1.

The water level of the measurin receptacle is indicated at 98, an overflowipassage 81 being provided to insure proper measurement of the water by the several compartments of the receptacle.

The adjacent side walls of the liquid measuring compartments are provided with openings 98 for the passage ofthe liquid from one measuring compartment to another, whereby the receptacle may be illled by discharging the liquid to either of said compartments, said adjacent walls being spaced apart at their inner ends to provide opening's 89 to afford clearance for the sidewalls of the receptacle 2! as shown'in Fig.4. g

The measuring receptacle is provided with a suitable lock 'or latch 40 for cooperation with a uring compartment 21a into the receptacle 21 will iiow immediately from the latter through a discharge conduit 44 which is extended intothe washing chamber [4 and so positioned as to discharge the liquid in contact with the blades of the impeller l5 for proper distribution or circulation by the latter.

As previously stated, the wash and rinsing pipe- 44 leading to the dish 'washin chamber as shownin Fig. 1.

A similar. siphon tube 5l. has its shorter leg, disposed within the receptacle :9 containing the rinse water, but in this case the longer leg of the tube is bent at its lower end and extended within 1 thesmall liquid receiving compartment imwater will, upon swinging the measuring receptacle from the position shown in Fig. 2 to that shown in Fig. 1, be discharged into the tanks or receptacles 28 and 29, respectively, to fill thesame substantially to the level indicated at a in Fig.

5. The receptacles 28 and 29 constitute heating compartments for the main supply of wash water and the rinse water, respectively, each being provided with heating means described hereinafter.

Disposed within the heating compartment 28 is an inverted container 28b and mounted within the heating compartment 29 is a similar container 29b. The air trapped within the container 28b by the liquid delivered to the heating receptacle 28 will be forced out by the liquid through a vent pipe 45 extending upwardly within the casing l0 and terminating in a supporting plate 46, Figs. 2

and 3. A similar vent pipe 41 extends from the inverted container 29b to the supporting plate 46 for carrying off the air trapped in said container by the liquid entering the same.

The open ends of the vent pipes are closed by a strip of rubber 49 or other suitable material secured upon the side walls of the measuring compartment 21a at the outer ends thereof as shown in Fig. 4, said member movin into engagement with the supporting plate 46 after the air has escaped from the inverted containers 28b and 29b.

The receptacles 28 and 29 are each provided with electric heating devices described hereinmediately below the receptacle 29, the hquid being discharged to saidcompartment for a purpose described hereinafter. The compartment 30 is connected with the liquid discharge pipe 44 by a shortrpipe 52, as shown by dotted lines in Fig. 3.

The means'for heating the washing and rinsing water in the receptacles 28 and 29 preferably comprises multiple surface immersion heaters of the grid type, one of which is shown at 53 in the receptacle 28, and two of which are shown at 54 and 55 inthe upper and lower portions of the receptacle 29 respectively. As will be under-stood, with liquid contact heaters of this type, the liquid lying between the spaced blades or contacts of the heater serves to complete the circuit. This is true also of the switches 56 and 51 in the upper and lower portions of the container 29b as Well as of the-switches 58 and 59 in the liquid receiving compartment 30.

The switch and heater construction is shown in Fig. 6, in which the supporting plate 6| has a plurality of laterally extending spaced blades ila lying between the blades 62a of the supporting plate 62. The blades are held in spaced relation and are insulated one from another by the parts 63, formed of rubber or other suitable insulating material, said parts in certain of the switch and heater units being projected below the blades as shown in Fig. 8 to form supporting means for units. The. number of the blades of any particular switch or heater unit may be varied to vary the capacity of the unit as desired, Furthermore, the size of the blades and the distance between the same may also be varied to regulate or control the capacity of the heater. It is found desirable to place certain of the heater and switch units within small liquid holding containers for maintaining one or more closed circuits after the main supplies of liquid have been discharged from the heating receptacles to the dish washing chamber.

Two of such containers are indicated at 54 in Fig. 3, one adjacent the. bottom of the liquid heating receptacle 29 for supporting the heater 55 and switch unit 51 and another in the compartment 30 for supporting the swtich units 58 and 59. The construction of the container 64 is best shown in Figs. '7 and 8, in which the blade insulating parts 63 are shown resting on the bottom of the container. The containers 64 are necessary at the points indicated in order to maintain a closed circuit when the rinse water in the compartment 29 is below a predetermined level, as for example when practically all of the supply of rinse water has been discharged to the dish washing chamber, at which time it is desired to prevent opening of the closure 13a for the washing chamber and to keep the motor running a whereby to operate the impeller to complete the rinsing operation. Under these conditions of operation the liquid within the receptacles 64 will be suflicient to maintain the motor circuit closed for the desired length of time and the electromagnets 23 and 60 energized to prevent opening of the drain valve and release of the latch for the closure [3a. The discharge end of the siphon Si is directed towards the container 64 in the compartment 30, so that the siphon fills the icontainer 64 before any substantial amount of liquid is discharged through the discharge pipe 52.

With the present arrangement the main supply of wash water delivered to the receptacle 28 is about half of the amount of rinse water delivered to the receptacle 29. Since the rinse water is not needed until after. the supply of wash water has been exhausted, it is necessary to so proportion the size or capacity of the heaters in the receptacles 28 and 29 as to insure proper timing of the same whereby to start siphoning of the rinse water for discharge to the dish washing chamber as soon as the main washing operation is completed.

The timing operations can be controlled in different ways, as for example by the use of the modified form of heating unit shown in Figs. 9 and in which the heater is mounted on a suitable support 65 which may constitute the bottom wall of the liquid holding receptacle or be in the form of a container similar to that shown at 64 in Figs. 7 and 8. The modified heater except for the means for controlling its capacity, is of the same construction as the one shown in Fig. 6,

an important factor in determining the current draw. If a thin strip of insulation is placed between the active surfaces of two of the heater leaves, the current will be forced to travel around the edges of the strip in order to reach the opposite leaf, In doing so it will travel for a part of the way through water of a lower temperature than that through which it would travel if the strip of insulation were not used. Thus the current will be reduced since its path of travel is increased through water the conductivity of which is decreased. By inserting a variable number of strips of insulation between the leaves of the heater or the switch the current can be limited as desired. .An example of this method of current control is illustrated in Figs. 9 and 10 in which two relatively long and short strips 66 and 61 of insulating material are shown between certain of the leaves of the heater.

The screen Ma is provided in the bottom of the washing chamber M which is spaced from and opposite the inlet end of the drain pipe 19 as shown in Fig. 1. The screen forms a pocket between the impeller and the conduit open at one side and at the top which is provided for the purpose of trapping food particles released by the washing or cleansing operations, which if allowed to remain in the water would tend to collect on and to adhere to the dishes after completing the rinsing operation. Such particles are of course kept in circulation by the action of the impeller, but tend to gravitate toward the bottom of the dish washing chamber. During the course of the agitation of liquidby impeller l5, the food particles tend to be trapped on the right hand side of screen Ma, so that after a comparatively short time substantially all of the particles find their way to the right hand side of screen Ma where they are trapped, later to be discharged through the discharge valve when it is opened. This construction collects practically all of the food particles on the right hand side; but if any remain on the left hand side they are of such small quantity as to be negligible.

The closure [3a for the dish holding container I3 is hingedly connected with the inwardly extending portion Ha of the end wall ll of the casing ill by means of a suitable number of hinges, one of which is indicated at 68 in Figs. 16 and 17. These hinges ar of a well known type, and each embodies a torsion spring 69, the spring operating to raise the closure substantially to the dotted line position shown in Fig. 1 when the latch for the closure is released, upon completion 'of the rinsing operation, by the solenoid or electro-magnet 60 supported by a bracket 68a, depending within the casing Hi from the end wall Ila thereof as shown in Figs. 1 and 11. The closure l3a has a forwardly extending member 10 thereon provided with a depending latch bar H for cooperation with the latch lever 12 pivoted intermediate its ends upon an arm 13 carried by the bracket 88a for supporting the electro-magnet 80. The latch is held in latching position when the door is closed by a spring 14. The latch has a pivoted dog thereon which is swung outwardly by the lug 16 on the armature 18 of the magnet when the latter is energized, at which time the armature is moved from the position shown in Fig. 11 to that shown in Fig. 12. The magnet is deenergized by the opening of the switch 59 at which time the spring 19 will return the armature to the position shown in Fig. 11. When this is done, the lug 16, through engagement with the dog 75, will trip the latch and release the cover for movement by the cover for movement by the springs 69 of the hinges 68 to the dotted line position shown in Fig. 1. The latch may be manually released when desired, by moving the releasing member from the position shown in Fig. 11 in a direction toward the latch to swing the latter upon the arm 13 against the resistance of the spring 74.

In the control of the temperature of the water, it has been found that .the current flowing through the blades of the heater and the water therebetween efiects a rather rapid generation of steam. It will be obvious of course that the nearer the bottom of the receptacle the heater is placed the longer it will take to collect sufficient steam in the upper end of the inverted container to force the water therefrom due to the fact that a greater quantity of steam must be condensed before the temperature of the water can be raised to a point at which the steam will be given on at the level of the liquid. In other words, if the heater is placed adjacent or even with the surface of the water, the steam generated by the heater will be quickly liberated since the amount of water to be heated before the steam will begin to escape will be relatively small compared to the quantity to be heated when the heating unit is placed in the bottom of the receptacle.

It will be seen therefore that if the heater is made adjustable for movement up and down within the receptacle, that th time required to accumulate sufficient steam above the level of 75 the liquid in the inverted container to raise the 58 at the desired level within the receptacle.

The modification shown in Fig. 18 embodies a single unitary heating device which can be used for heating liquids for various purposes, said unit being adapted for use in laboratories, bath rooms or wherever it may be desired to provide for a relatively quick supply of hot water or other liquid. This device comprises a receptacle lla having a hinged cover 32a, the receptacle being provided with an inverted container 33a from which extends a vent pipe 34a having its upper end terminating in a support 35a and closed by the cover 32a after the receptacle has been filled with liquid to a predetermined level as indicated for example at 35a.

A multiple surface heater of the type shown for example at 53 in Fig. 3 is disposed within the receptacle, the heater and the parts for raising and lowering it within the receptacle being the same as those shown in Fig. 2, have been given the same reference numerals. The adjustable strips of insulation 88 and 61 shown in Figs. 9 and 10 are also shown in Fig. 18, being provided for the same purpose in both cases.

A siphon tub 50a has its short leg disposed within the receptacle 3 la, the longer leg of which can be adapted for discharging the hot water or liquid to any desired point. When the liquid is deliveredto the receptacle it will rise within the inverted container 33a, and cause the air to escape through the vent pipe 34a, which however will be closed by the cover 32a when the latter is moved to closedposition, whereby toprevent 1 the escape of steam from the inverted container.

The multiple surface heater 53' will serve both as a means for heating the liquid and for closing the circuit, the circuit connections not being shown. However, if preferred, a switch corresponding to the switch "51 of Figure 3 can be placed within the receptacle for controlling the circuit if found advisable. Furthermore, an ad'- ditional heater can be positioned within the receptacle above the one shown, corresponding to the heater 54 shown in Fig. 3, to increase the temperature of the liquid if desired. It will be understood that the modified heating device is entirely automatic, the only operation required being that of placing the required amount oi. liquid within the receptacle.

' In order to start the machine the measuring tank 34 is filled and the contents of receptacles 21a, 28a, and 29a thereof discharged into the receptacles 21, 28, and 29, respectively. The prewash water received by the intermediate receptacle 21 will begin'immediately to discharge through the supply pipe 44 to the washing chamber M. The switch 51 in the receptacle 29 being immersed within the liquid, will close the motor circuit, current flowing through the conductor 85, switch 51, conductor 86, motor l8, and back through conductor 81. Current will also flow through resistance 24, heaters 53 and 55 in receptacles 28 and 29 respectively.

As soon as the water reaches a predeter'rnined level in the inverted container 29b, the upper switch 56 therein will be closed, current flowing through conductors 85 and 88', switch 58, conductors 89 and 98, electro-magnet 23 and conductors 9i and 81, thus energizing the magnet to effect closing of the drain valve to retain 5 the pre-wash water in the washing chamber It. This water serves to dissolve the soap'or washing compound, and being cooled by the walls of the washing chamber will soften the particles of food As soon as steam is' generated within the re- .Jeptacle 28, it will collect in the upper portion of m the inverted container 28b, and will then begin to force the water from the container whereby to raise the level within the receptacle 28 to a point at which to start operation of the siphon 50, which will deliver the main body of washing water to the supply conduit 44 for discharge to the washing chamber M, where it will be mixed wLth the small amount of pro-wash water therein after the latter has been circulated by the impeller in contact with the dishes to effect softening of the food particles and other materials adhering to the dishes. The main washing operation will then begin, and will continue until the drain valve is opened.

In the meantime, the multiple surface heater 55 within the receptacle 29 will serve to heat the rinsewater therein, steam being generated which will collect in the upper end of the inverted container 29b whereby to force the water from the container to raise the level within the receptacle 28. As soonas the steam'has forced the water below the level of the switch 56, current will cease to flow through the eiectro-magnet 23 which will then become de-energized and allow the spring 22 to open the drain valve 20 to permit the wash water reaches the heater 54 the latter will be included in the motor circuit and will afford additional heating means for the liquid substantially at the level of its discharge from the receptacle.

At about the time the heater 54 becomes immersed the rinse water in the receptacle 29 will have reached the inlet end of'theby-pass pipe 5la through which a small amount of water will flow to and through the supply pipe 44, and into the washing chamber where it will serve as-"a and food particles which may have accumulated in the lower portion of-the chamber [4 butwithout disturbing the soapy film or suds adhering to the walls of the upper portion of the chamber and the dishes, it being understood that this will containing the switch units 58 and 59, at which time the switch 58 will be closed to again energize the electro-magnet 23 to effect closing of the valve 20 for maintaining the rinse water in the washing chamber, current then flowing through switch 51, conductors 92 and 93, switch 58, conductors, 94 and 98, electro-magnet 23 and conductors 9| and 81.

Switch 59 will also be closed by the water ente'ring compartment 30, current flowing through water to escape into the tank 25. Assoon as the pro-rinse supply for washing out the soap-suds The rinsewater is discharged switch 51, conductor 92, switch 59, conductor 95, electro-magnet 60 and conductors 8i and 81. Thus the electro-magnet 60 for releasing the closure [3a will be energized whereby its armature will be moved from the position shown in Fig. 11 to that shown in Fig. 12*, at which it will be held during the final rinsing period. After the main supply of rinsing water has been withdrawn from the receptacle 29, there will still remain a certain amount of water in the small container 64 within which the switch 51 is disposed which will be sufficient to keep the motor circuit closed and the motor running.

At the same time the water within the small containers 64, within which the switches 51 and 59 are disposed, will be suflicient to close said switches so that the electro-magnets 23 and ill will remain energized for the desired length of time. When the water in the containers 64 has boiled down to a level below the blades of the switches therein, the motor circuit will be opened and the electro-magnets 23 and 60 will become de-energized at which time the drain valve 26 will be moved by the spring 22 to open position and the armature 18 of magnet 60 released for movement by the spring I9 to release the cover latch 12 whereby the springs 69 will raise the cover to the dotted line position shown in Fig. 1 in order to provide for ventilation of the washing chamber and proper drying of the dishes before removing the same from said chamber.

It will be understood as previously stated, that the adjustable resistance 24, in series with the water heaters 53 and 55, is employed not only to limit the current draw of the heaters when waters of diil'erent degrees of conductivity are used, but also to heat the drain pipe I! to warm or heat the water held therein during the washing and rinsing operations.

It will be understood that either hot or cold water may be used in starting the machine, but that if hot water is used the time required to generate suihcient steam in the receptacles 28 and 29 to raise the liquid to a level at which to start operation of the siphons will be considerably reduced. I

It will also be understood that where the machines are used in different localities having water the conductivity of which varies, that the current can be regulated accordingly by means of the variable resistance indicated diagrammatically at 24 in Fig. 15.

While the liquid contact switches shown in Figs.

3 and 5 are provided primarily as circuit controlling means they nevertheless constitute electric heating devices which will serve to increase or raise the temperature of the liquid by reason of the discharge of the current therethrough and through the leaves of the heater.

' By placing the leaves of the heater 54 in superimposed relation as shown in Fig. 3, the supply of heat will be gradually increased as the level of the liquid rises since the leaves will be successively contacted by the liquid. Furthermore, by placing the heater 54 near the level of discharge of the liquid from the receptacle 28, the rinsing liquid can be delivered to the dish washing chamber at relatively high temperatures which maybe controlled or regulated by increasing or decreasing the capacity of the heater.

It will be noted that the vent pipe 45 is extended a considerable distance within the inverted contrapped within the upper portion of the container, which cannot escape since the pipe will be closed by the liquid when raised to the level indicated in Fig. 2. It will be further understood that the air trapped within the upper end of the container will tend to expand upon being heated by the liquid whereby to increase the pressure on the latter. When steam is generated within the container the pressure will be increased and the liquid raised to the desired level within the receptacle 28.

The modification shown in Fig. 19 embodies a liquid heating device or receptacle of a type which may be substituted for the heating receptacles shown in Figs. 1 to 5, inclusive, if desired. The modified receptacle is indicated at 84a and has a liquid supply pipe "a which may be connected with any suitable supply source such, for example. as a water supply pipe having a valve for controlling the flow of the water. Extending from the receptacle is a discharge conduit "a adapted to be projected within the dish washing chamber l4 and to deliver the liquid thereto for circulation therein by the impeller l5.

Any desired number of liquid heating or circuit controlling devices of any preferred type may be disposed within the receptacle 14a for heating and controlling the ilow of the liquid, one of such heaters being shown by way of example at 81a in Fig. 19, which may be of the liquid contact type shown in Figs. 1 to 5, inclusive, or of any preferred design.

It will be understood that liquid heating receptacles of the type shown in Fig. 19 may be substituted for the receptacles 24 and 29 of Figs. 2 and 3 and provided with the same or corresponding liquid heating and circuit controlling devices for cooperation in heating and controlling the flow of the liquid and for energizing the electromagnets for controlling the operation of the drain valve and latch means for the closure of the washing container. It will be further understood that in such an arrangement the siphon tubes will be omitted, but that a compartment corresponding to that shown at 30 in Fig. 3 and including the switches or circuit control devices therein may be connected with the receptacle 840 containing the rinsing liquid to function in the manner and for the purpose previously described herein.

Furthermore, since with the modified type of receptacle shown in Fig. 19 the liquid is discharged directly to the washing chamber by the pressure of the steam within the receptacles, they may be located within the casing it below the washing container or so arranged therein as to permit the size of the casing to be reduced to a minimum.

A self-closing valve Ila is provided at the discharge end of the supply pipe "a which will be automatically closed by the pressure of the steam within the receptacle. The level of the liquid in the receptacle 84a is indicated at "a, it being tainer 28b and it will be understood that the liquid understood, however, that the quantity of liquid placed within the receptacle may be varied asdesired and that the heating devices may be ad- Justed or placed at different levels within the receptacles, as diflerent conditions may require.

In the operation of the machine the compartments of the measuring tank are first provided with the desired quantities of pre-wash, wash. and rinsing water and upon swinging the tank from the position shown in Fig. 2 to that shown in Fig. 1, the water will be discharged to the receptacles 21, ll, and 2!, respectively, the pre-wash 13 water being preferably discharged by gravity to the washing chamber I4 as shown along line I of Fig. 20. Upon discharging the washing and rinsing water to the receptacles 28 and 29, respec tively, the heaters 53 and 55 will begin to heat the water therein. At the same time the motor control switch 51 within the receptacle 29 will be closed by the water to start operation of the motor and likewise the switch 56 will also be closed by the water to permit the coil 23 to become energized to eiiect closing of the drain 'valve 20.

respectively, the former for operating the drain valve to close the outlet of the washing chamber and the latter for moving the door-controlling armature from the position shown in Fig. 11

The impeller I5 will then circulate the cold or tepid pre-wash water within the washing chamber and mix it with the detergent placed therein, the circulation of the mixture in contact with the dishes serving to soften and loosen the food or foreign particles adhering to the dishes, and particularly the albuminous materials which are difficult to remove when allowed to' dry on the dishes as diagrammaticallyindicated between the line l00 and ml of Fig. 20. At the completion of the period of circulation of the pre-wash waterthe main supply of wash water, under the pressure of the steam generated within the receptacle 28, will be discharged to the washing chamber and mixed with the pre-wash water and circulated in contact with the dishes to wash the same as indicated at line IOI of Fig. 20.- At about the time the washing operation is completed the rinsing water within the receptacle 29 will be forced below the switch 56 by the steam in the inverted receptacle 2%, thus de-energizing the magnet 23 for closing the drain valve and allowing the latter to be opened by the spring 22 to permit the water to discharge from the washing chamber as indicated between lines I02 and I03 of Fig. 20.

At about the time this operation is completed the water within the receptacle 29 will be forced upwardly therein by the pressure of the steam to a level at which a small amount of pre-rinse water will discharge through the restricted by-pass 51a to and through the conduit 44 to the washing chamber where it Will be discharged in contact with the upper ends of the impeller blades at which time the impeller is still being driven by the motor as indicated at line I03 of Fig. 20. Due to the relatively small amount of pre-rinse water permitted to discharge through the by-pass 5Ia and its rather slow rate of discharge from the conduit 44, the greater portion of the water will be acted upon by the upper ends of the blades of the impeller and thrown off by the same in a lateral direction within the lower portion of the washing chamber only, whereby to eifect discharge of the soap-suds and food particles which may have accumulated therein, it being understood that at this time the drain valve is still at open position. However, since the pre-rinse water is not permitted to circulate within the upper portion of the washing chamber the soap-suds adhering to the walls thereof and to the dishes will remain thereon and be taken up by the main supply of rinse water which is discharged by the impeller to all parts of the washing chamber with the drain valve in closed position. I

By the time the pre-rinse operation is completed the steam in the receptacle 29 will have raised the water to a level sufficient to start oper ation of the sy'phon 5| which will then begin to deliver the water to the compartment 30 for passage therethrough to and through the conduits 52 and 44 to the washing chamber as indicated in line I04 of Fig. 20. When the water is discharged to said compartment it will close the switches 58 and 59 therein to energize magnets 23 and 30,

to that shown in Fig. 12 for eflecting release of the latch for the door when the final rinsing operation is completed, whereby to admit air to the washing chamber to facilitate drying of the dishes therein.

Upon delivery of the main supply of rinse water to the washing chamber it will be circulated therein by the impeller at which time the soapsuds or film of soap adhering to the upper walls of the washing chamber and to the dishes will become mixed with the rinsing water and circulated therewith in contact with the dishes as indicated between lines I04 and I05 of Fig. 20.

After substantially all of the rinsing water has been discharged from the receptacle 29 and the compartment 30 to the washing chamber, the motor will continue to operate for a short period to complete the rinsing operation, the motor switch during this time being kept closed by the small amount of water held within the upper container 64 within which the switch is disposed. The switches 58 and 59 disposed within the lower container 64, which serve to control the magnets 23 and 60, respectively, are likewise kept closed by the water therein during the completion of the rinsing period. However, as soon as the water has boiled down within the switch holding containers 64, the motor will stop and the magnets become de-energized to allow the drain valve and tion to the liquid as to cause it to exert pressure thereon sufficient to raise the liquid to a level at which it will start operation of the siphon.

2. In apparatus of the class described, a container for receiving a heated liquid, a receptacle in which to heat the liquid, a discharge connection leading from the receptacle to the container including a siphon for withdrawing the liquid from the receptacle, an electric heater within the receptacle for heating the liquid to generate steam therein, said heater comprising a plurality of spaced metal contacts disposed within the liquid and cooperating therewith to form conducting means for an electric current for heating the liquid, and means including an inverted substantially cup shaped container for maintaining the steam in such relation to the liquid as to cause it to exert pressure on the liquid suflicient to raise it to a level at which to start operation of the siphon.

3. Apparatus for automatically supplying liquid to a chamber in a predeterminedsequence comprising in combination, liquid feeding means for feeding separate bodies of liquid to said chamber, heating means for said liquid feeding means, and provisions for automatically sequentially feeding said separate bodies of liquid to said washing chamber in response to liquid temperature in said liquid feeding means.

4. Apparatus for automatically supplying liquid to a washing chamber comprising in comhination, a plurality of liquid feeding receptacles for feeding liquid to said washing chamber, heating means for said receptacle, and provisions for automatically sequentially feeding liquid from said receptacles to said washing chamber in response to liquid temperature in said receptacles.

5. In apparatus of the class described, a receptacle in which to heat a liquid, the receptacle having an outlet for the liquid, means within the receptacle for heating the liquid therein normally below the level of said outlet to generate steam within the receptacle, means for collecting and maintaining the steam in such relation to the liquid as to cause it to exert pressure thereon sufficient to raise the liquid to a level at which it will flow through said outlet, and means for varying the rate of generation of steam so as to vary the time required for the liquid to reach said outlet said last named means comprising means for varying the depth of said heating means within said liquid.

6. In apparatus of the class described, a receptacle in which to heat a liquid, the receptacle having an outlet for the liquid, means within the receptacle for heating the liquid therein normally below the level of said outlet to generate steam within the recepacle, means for collecing and maintaining the steam in such relation to the liquid as to cause it to exert pressure thereon sufilcient to raise the liquid to a level at which it will flow through said outlet, and means for varying the rate of generation of steam so as to vary the time required for the liquid to reach said outlet, said last named means comprising means for varying the position of said heating means with respect to the surface of said liquid,

7. In combination, a receptacle in which to heat the liquid, 9, siphon for discharging a liquid from the receptacle, means for heating the liquid within the receptacle to generate steam therein, means for maintaining the steam in such relation to the liquid as to cause it to exert pressure thereon sufficient to raise the liquid to a level at which it will start operation of the siphon, and means for varying the rate at which a given amount of heat given oil" by said heating means generates steam.

8. Means for supplying liquid to a washing chamber comprising in combination, a receptacle for the washing liquid, a second receptacle for the rinsing liquid, a siphon connected with each of said receptacles for withdrawing the liquid therefrom, means connecting the siphons with said washing chamber, a heating device connected to each of said receptacles for generating steam therein, means for causing the steam in each of said receptacles to initiate the operation of the siphon associated therewith, and means causing said heating devices to complete their respective operations in a predetermined sequence.

9. A machine comprising a feed receptacle, a chamber, a heater for said receptacle having provisions for heating liquid in said receptacle above the bottom thereof, means for adjusting the height of said heater, means for trapping steam generated in said receptacle and utilizing the pressure thereof for causing delivery of liquid from said receptacle to said chamber at an average temperature determined by the height at which said liquid is heated.

10. In a washing machine, a plurality of liquid holding receptacles, means for heating the liquid within the receptacles to generate steam therein, and means responsive to the amount of steam generated for successively discharging the liquid from said receptacles in a predeterminei sequence.

11. Apparatus for supplying liquid to a wash ing container comprising in combination, a plu rality of liquid measuring receptacles includlnl means for flowing liquid from one of said recep tacles to another of said receptacles, a pluralit: of liquid holding receptacles, means for directing liquid from said liquid measuring receptacle to said holding receptacles, means for heating the liquid within said liquid holding receptacles and means for feeding liquid from said holding receptacles into said washing container.

12. Means for supplying liquid to a washing chamber comprising in combination, receptacle: for pre-washing, washing and rinsing liquids, z measuring tank have compartments for said prewashing, washing and rinsing liquids, means supporting the tank for movement to discharge saic liquids to their corresponding receptacles, electric heating devices within the receptacles containing the washing and rinsing liquids for generating steam therein, means in said last mentioned receptacles for confining the steam so a: to displace some of the liquid, and means responsive to displacement of said liquid for siphoning the liquid from said receptacles to said chamber, said heating devices being so constructed and arranged as to complete their respective operations in a predetermined sequence in which the rinsing liquid will be delivered to the washing chamber at a predetermined time subsequent to the delivery of the washing liquid thereto.

13. Apparatus for supplying liquid to a washing container comprising in combination, a plurality of liquid measuring receptacles including means for flowing liquid from one of said receptacles to another of said receptacles, a plurality of liquid heating receptacles, means for directing liquid from said liquid measuring receptacles to said heating receptacles, means within said liquid heating receptacles for heating the liquid within said receptacles, and means for feeding liquid from said heating receptacles into said washing container.

14. Apparatus for supplying liquid to a washing chamber comprising in combination, a plurality of liquid holding receptacles, means connecting said receptacles with the washing chamber, electric heating devices within said receptacles for heating the liquid to generate steam within the receptacles; means for causing the steam to displace liquid within the receptacles, said first named means comprising means to effect discharge of the liquid through said connecting means to the washing chamber in response to said displacement, and means to cause the electric heating devices of said receptacles to complete their respective operations in a predetermined sequence.

15. Means for supplying liquid to a washing chamber comprising in combination, receptacles for pre-washing, washing and rinsing liquids, a measuring tank having compartments for said pre-washing, washing and rinsing liquids, means supporting the tank for movement todlscharge said liquids to their corresponding receptacles, electric heating devices within the receptacles containing the washing and rinsing liquids for generating steam therein, means in said last mentioned receptacles for confining the steam so as to displace some 01' the liquid, and means responsive to displacement of said liquid for siphoning the liquid from said receptacles to said chamber,

said heating devices being so constructed and arranged as to complete their respective operations in a predetermined sequence in which the rinsing liquid will be delivered to the washing chamber at a predetermined time subsequent to the delivcry of the washing liquid thereto, said means for supporting the measuring tank comprising means for pivotally mounting the tank adjacent the upper edges of said receptacles whereby tilting of said tank'towards said receptacles causes the liquid to flow from said compartments into said receptacles.

16. Means for supplying liquid to a washing chamber comprising in combination, receptacles for pre-washing, washing and rinsing liquids, a measuring tank having compartments for said pre-washing, washing and rinsing liquids, means supporting the tank for movement to discharge said liquids to their corresponding receptacles,

said compartments being arranged in horizontal alignment and having communicating passages whereby the liquid may flow from one of said compartments to another of said compartments, electric heating devices within the receptacles containing the washing and rinsing liquids for generating steam therein, means in said last mentioned receptacles for confining the steam so as to displace some of the liquid, and means responsive to displacement of said liquid for siphoning the liquid from said receptacles to said chamber, said heating devices being so constructed and arranged as to complete their respective operations in a predetermined sequence in which the rinsing liquid will be delivered to the washing chamber at a predetermined time subsequent to the delivcry of the washing liquid thereto.

- DONALD K. FERRIS.

REFERENCES crran The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 576,006 Tilden Jan. 26, 1897 992,021 Marzetti May 9, 1911 1,017,874 Kelso Feb. 20, 1912 1,080,214 Hadaway Dec, 2, 1913 1,090,420 Steed Mar. 17, 1914 1,149,195 Heermans Aug. 10, 1915 1,184,178 Hanks Apr. 23, 1916 1,292,431 Cass Jan. 28, 1919 1,306,089 Wagenhorst June 10, 1919 1,520,691 Boyuls Dec. 30, 1924 1,567,371 Huebsch Dec. 29, 1925 1,639,024 Carroll Aug. 16, 1927 1,639,368 Carroll Aug. 16, 1927 1,662,496 Forsgard Mar. 13,- 1928 1,827,087 Hynes Oct. 13, 1931 1,836,373 Kadesch Dec. 15, 1931 1,849,283 Crane Mar. 15, 1932 1,920,013 Green July 25, 1933 1,971,588 Stoddard et a1 Aug. 28, 1934' 1,983,084 Janus Dec. 4, 1934 1,987,381 Twombly Jan. 8, 1935 2,024,952 Snyder et a1 Dec. 17, 1935 2,157,112 Bonner May 9, 1939 2,181,983 Voris Dec. 5, 1939 FOREIGN PATENTS Number Country Date 389,812 England Mar. 27, 1933 680,700 France a Jan. 22, 1930

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Classifications
U.S. Classification134/57.0DL, 134/97.1, 134/106, 134/111, 134/98.1, 134/96.1, 134/95.1, 134/188
International ClassificationA47L15/06, A47L15/42
Cooperative ClassificationA47L15/4297, A47L15/06, A47L15/4259
European ClassificationA47L15/42J6A, A47L15/06, A47L15/42W