US2155273A

US2155273A - Washing apparatus

Info

Publication number: US2155273A
Authority: US
Inventors: Benjamin W Jones
Original assignee: General Electric Co
Current assignee: General Electric Co
Priority date: 1935-03-28
Filing date: 1937-10-05
Publication date: 1939-04-18
Anticipated expiration: 1956-04-18
Also published as: GB465684A

Description

April 18, 1939. B. w. JONES v WASHING APPARATUS 2 Sheets-Sheet 1 Original Filed March 28, 1935 Fig.1.

6. J torny.

Inventor: BenJaminWJ'ones,

B. w. JONES WASHING APPARATUS A ril 18, 1939.

Original Fi ledMarch 28, 1935 2 Sheets-Sheet 2 I S; m W 0 n. J r t. o nw it e 6t m A m W B Patented Apr. 18, 1939 PATENT OFFICE WASHING APPMTUS Benjamin W. Jones, Schenectady, N. Y., assignor to General Electric Company, a corporation of New York Original 1342'].

application March 28, 1935, Serial No. Divided and this application October 5, 1937, Serial No. 187,400

, '7 Claims.

This invention relates to washing apparatus. more particularly to apparatus for washing dishes, and it has for its object the provision of improved apparatus of this character which can be manually controlled to eflect a cleansing action, or which, if it isdesired, will automatically effect a timed washing cycle.

While not limited thereto, this invention has particular application to dishwashing apparatus wherein a cleansing fluid, such as water, is circulated ,or'hurled in a washing vat by suitable power driven means, such as a motor driven impeller, so as to effect a cleansing action on the v dishes supported in the vat.

In accordance with this invention, suitable valves are provided for controlling the admission ofthe cleansing fluid to and the drainage of soiled fluid from the vat. When the fluid supply valve is open to permit cleansing fluid to flow to the vat while the drain valve is closed to cause it'to accumulate in the vat, and the impeller is operated by its motor; the impeller will engage the accumulated "fluid to circulate it in the vat so as to effect a washing action on the dishes supported within the vat.

Means are also provided in the vat for acting upon the water supplied to the vat so as to circulate it in the vat in spray form to effect a rinsing action on the dishes in the vat. This rinsing action takes place as long as fluid is supplied to the vat and the drain valve is held in its open position to prevent the accumulation of fluid in the vat for agitation or circulation by the impeller proper.

In other words, if fluid is supplied to the vat and the drain is closed while the impeller is operated, the apparatus will wash the dishes, whereas if the drain is open under similar conditions, the apparatus will rinse the dishes.

This invention contemplates the provision of improved means for controlling the operation oi. the fluid supply and drain valves and the impeller motor, whereby these members can be operated either manually or automatically as de- 5 sired, so as to effect these washing and rinsing actions.

In one form of this invention, the fluid supply and drain valves are operated by suitable electroresponsive means, such as electromagnetic devices. These electromagnetic devices, as well as the impeller driving motor, are controlled by means of a manually operable master switch. This master switch effects the operation of the electroresponsive devices and the impeller motor through the operation of a suitable program motor. The program motor is controlled to eflect either washing or rinsing actions for predetermined intervals of time, as desired by the attendant, or to effect these cleansingactions in an autovmatic timed cycle.

This application is a division of my copending application, Serial No. 13,427, filed March 28, 1935, and assigned to the same assignee as this application.

. For a more complete understanding of this invention, reference should be had to the accomcertain elements of the washing apparatus of Fig. 1, together with certain control means provided therefor and arranged in accordance with this invention.

Referring to the drawings, this invention is shown in one form as applied to dishwashing apparatus comprising a washing vat i 0. The vat ID, as shown, is supported in an upright position in a suitable rectangular casing defined by front and rear walls i I and i2 and a pair of side walls It. These walls as well as the vat l0 preferably will be formed of a suitable sheet material, such as steel preferably enameled. The vat I0 is shaped to define a relatively deep chamber, preferably square in cross-section. It will be understood that the vat will be supported at its upper end by the upper walls of the casing in any suitable manner, the details of which are not shown, because they form no part of this invention. It will also be understood that the vat ill will be provided with a suitable cover member (not shown) which is secured to the casing by means of suitable hinges It, and which is provided with a handle or knob 15 whereby it can be moved conveniently between its open and closed positions.

It is to be understood that suitable removable open-work baskets or racks will be provided in the lower and upper portions of the vat. Only the lower rack I8 is shown. While any suitable racks may be used, it is preferable to use the racks described and claimed in the U. S. patent to Forrest A. Walker, No. 2,035,625, dated March 31, 1936.

The bottom wall of the vat III, as shown, is provided with a plurality (four) of inclined portions ll which slope downwardly toward the center of the bottom of the vat and terminate in an opening |8 arranged centrally of the vat.

In the lower portion of the vat above the opening I8 is a suitable impeller l9 arranged to rotate on an axis substantially coaxial with the central vertical axis of the opening I8. The impeller I! is operated by means of an electric motor 2|] below the bottom wall of the vat and having its shaft 2| extending through the opening l3 into the vat where it is mechanically connected with the impeller IS. The motor is supported from the bottom wall of the vat by means of a bushing 22. This bushing is provided with a horizontal annular flange 23 which rests upon the bottom wall of the vat, as shown, and with a cylindrical portion 24 extending downwardly through the opening l8. This portion functions to support an apron 25 to which the motor 20 is secured. The apron 25 is mechanically secured to the depend: ing portion 24 by means of a plurality of circumferentially spaced set screws 25, only one of which is shown.

The impeller I9 is provided with blades which may have any suitable shape, the important feature being that the blades be given a shape such that the cleansing fluid placed in the lower portion of the vat and allowed to accumulate therein will be thrown upwardly and outwardly in an efiicient manner through the dish-supporting trays by the rotary motion of the impeller.

Suitable cleansing fluid, such as hot water, is

introduced into the vat through the medium of a suitable spray device comprising a reaction nozzle member 21. Water is supplied to the nozzle member by means of suitable conduit means including a pair of

upright conduits

28 and 29 disposed on opposite sides of the impeller H, as clearly shown in Fig. 1. The

conduits

28 and 29 communicate at their lower ends with a,suit able ring-shaped conduit member 30 resting on the bottom wall of the vat. The

conduits

28 and 29 at their upper ends communicate with the reaction spray device by means of a conduit 3| which also functions to support the spray device. The spray device 21 together with its conduits 25, 29 and 3| are described and claimed in the U. S. patent to Jesse H. Clark No. 2,025,571, dated December 24, 1935. Water is supplied to the ring conduit 35 by means of a conduit 32 which, as shown, enters the vat through a suitableaperture provided for it in the bottom wall; this conduit communicates with a conduit 33 which in its turn communicates with a suitable water supply source 34 through a controlling valve 35. The valve is biased to its closed position by a spring 36 and is opened by means of an electromagnet 31.

A drainage port 38 is provided in the lower portion of the bottom wall of the vat. This outlet or port 38 communicates with a drain chamber 39 which in turn communicates with a drain conduit or discharge 40.

The drain port 38 is controlled by means of a drain valve 4| which, as shown, is carried by an arm 42 which is arranged to rotate on a shaft 43. The arm 42 is provided with an extension 44 on the side of the shaft opposite the valve 4|, and cooperating with this extension is a suitable tension spring 45 arranged to bias the valve to its open position. The valve is moved to its closed position against the bias of the spring 45 by means of an electroresponsive device 46, such as a suitable electromagnet. The armature 41 of this electromagnet is connected with the lever 42 by means of a link 48 so that when the electromagnet is energized to attract its armature, the link will be moved to operate the valve to its closed position. Preferably, the link 45 will have a resilient connection 49 with the lever extension 44.

Means are provided for injecting a suitable detergent into the washing vat at the proper time during the washing cycle. The detergent injecting means comprises a suitable container or receptacle 55 in which the detergent will be placed, preferably in liquid form. This liquid detergent may be formed of a solution of any suitable cleansing material in water. The upper end of the supply cylinder communicates with the washing vat III by means of a conduit 5| communicating with the upper end of the cylinder and with the vat, as shown in Fig. 1. A predetermined amount of the solution in the cylinder 50 is caused to flow into the vat by causing an equal amount of water to flow into the lower end of the container. This introduction of water into the lower end of the container forces the solution in the upper portion of the container to flow through the passageway 5| to the vat.

Water is supplied to the lower end of the cylinder 50 from the supply source 34 by means of 'a conduit 52 which communicates with the source of supply 34 through a valve 53 and the control valve 35.

The conduit 52 at its upper end communicates with a conduit 54 within the cylinder 50 which opens into the lower end of the cylinder. Arranged transversely of the detergent cylinder above the opening of the conduit 54 is a suitable screen 55 which serves to spread or diffuse the water admitted by the conduit 54 through the lower portion of the detergent material within the cylinder. Diffusion of the water is particularly useful if the detergent include a solid material dissolved in the water, because it spreads the incoming water over the entire lower surface of any of the solid material which might have gravitated to the bottom of the container.

The valve 53 like the valve 35 is biased to its closed position by means of a spring 55a, and is opened against the bias of the spring by means of anelectromagnet 55. If desired,-and it is preferable to do so, the two valves may be incorporated in a single housing 51, as shown, the valve 53 being arranged so that it cannot possibly admit water to the conduit 52 unless the main inlet valve 35 is opened. If this latter valve is opened to permit water to flow into the vat, and the valve 52 is then opened, some of the water flowing from the supply source 34 will be diverted to the detergent cylinder 50 through the conduits 52 and 54.

In the operation of the washing apparatus thus far described, it is contemplated that when water is supplied to the vat from the source 34, it will issue from the reaction spray device 21 so as to effect a rinsing action on the dishes in the rack. This operation will be effected as long as water is supplied to the vat and providing the drain valve 4| is in its open position to allow the water gravitating to the bottom of the vat to flow freely into the drain 43. If, on the other hand, water is supplied to the vat and the drain valve 4| is closed and the impeller l9 operated, the water gravitating to the bottom of the vat will accumulate therein and will be picked up and circulated by the impeller upwardly and outwardly in the vat through the dish-supporting racks so as to efiect a washing action on the dishes supported in these racks. In other words, the

position of thedrain valve 4| determines whether a rinsing or a washing action will be effected.

In ac'cordance with this invention, suitable means are provided for controlling the operation of the impeller motor 28,-the fluid supply valve 35, the drain valve 4i and the detergent valve 58 so as to effect a predetermined cleansing cycle including'both rinsing and washing operations, in certain of which detergent is supplied to the vat. It is contemplated that the control means will include a manually operable member, whereby a washing action can be had, as desired at the will of the attendant, the washing action continuing as long as the control member is allowed to remain in a corresponding controlling position; and further, the provision of means for automatically effecting a timed cleansing cycle including both rinsing and washing steps without manual effort on the part of the attendant.

The control means is shown diagrammatically in Fig. 3.

As shown, the impeller driving motor 28 is controlled by means of a switch 58, the electromagnet 31 by means of a switch 59, the electromagnet 56 by means of a switch 60, and the electromagnet 46 by means of a switch 6|. The

switches

58, 59, 68, and 6| are controlled by means of

cams

62, 63, 64 and 85 respectively. These cams are mounted upon a cam shaft 66. The cam shaft 86 is driven by a program motor 67.

Any suitable constant speed timing motor 61 may be used, but preferably a self-starting synchronous motor will be used of the type described and claimed in the United States patent to H. E.

Warren, No. .1,495,936, dated May 27, 1924. Briefly, this motor comprises a bi-polar magnet 61a having a single phase energizing winding 61b, and with suitable shading coils (not shown) for producing a rotating magnetic field. The motor is further provided with a suitable rotor 6lcwhile the rotor operates at a very high speed thev cam shaft will be driven at a relatively low speed. The program motor 61 is also arranged to rotate in both forward and reverse directions. For this purpose, the motor is provided with a second bipolar magnet 68 and energizing winding 69. Here also, suitable shading coils (not shown) are provided for producing a rotating magnetic field, but in the reverse direction to the rotation of the magnetic field created by the winding 61!: and its shading coils. The program motor is controlled by means of a master switch 18 which comprises a movable controlling switch arm 18a. This arm is driven by means of a manually oper able control member Ii accessible on the exterior of the vat, as shown in Fig. 2. The control mem- A suitable incandescent lamp I2 is positioned adjacent the control member II beneath a trans- The in- The program motor 61 is further controlled by means of auxiliary switches H and 15 which in turn are controlled by means of cams l6 and ll respectively mounted upon the cam shaft 66. Furthermore, the program motor 61 is controlled by means of three limit switches I8, 19 and 88 which are controlled by means of cams 8|, 82 and 83 mounted upon the cam shaft 66.

It is contemplated that the impeller driving motor 20 will be utilized to drive an appliance socket 84 (Fig. 2) by means of a driving connection comprising a flexible drive shaft 85. A belt drive 86 is interposed between the shaft 85 and the impeller motor 28. Any suitable power shaft 81 may be driven from the socket 84.

The operation is as follows:

When the control member H is in its off position, as shown in Fig. 3, all of the switches H, 15, 58, 59, 60 and 6! are opened, while the limit switches I8, 19 and 88 are closed.

If it be desired to operate the impeller motor 28 to drive the socket 84 without effecting any other controlling action of the apparatus, the control member H is moved in a counter-clockwise direction to its motor position. In this position of the control member, the switch arm 18a closes the switch contact 10b which operation effects the energization of the program motor 61 in a forward direction, that is, to drive the cams in a clockwise direction, as viewed in Fig. 3. This energizing circuit may be traced from the negative side of the electrical supply source 88 through the switch arm a, the contact 10b, the conductor 89, the closed limitswitch 88, the conductor 98, the forward field winding 61b of the motor 61, thence through the conductor 9i to the positive side of the supply source 88. The program motor 61 then advances the cam shaft 66 until the depression 83a of the cam 83 moves to such a position that the limit switch 88 is permitted to open. The program motor is deenergized by thisoperation and stops the shaft 66 in this position where the lift 62a, of the motor cam 62 closes the switch 58.- This completes an energizing circuit for the motor 20 from the negative side of the supply source 88 through the switch arm No, the switch contact 186, the conductor 92, the conductor 93, the operating coil of an electromagnet 94 to the closed switch 58 and thence through the motor 28 to the positive side of the supply source 88. In this position of the cam shaft, the switches 14 and 15 will be closed, because the depressions 16a and Ila of cams l6 and 11 will be removed from the switches, but they will effect no controlling action on the apparatus at this time. The

switches

59, 68 and 6| will remain open by reason of the factthat they will be opposite the depressions 63a, 64a and 85a respectively of their

controlling cams

63, 64, and 65.

The motor 28 will continue to run as long as the master switch is in its motor" controlling position. If it be desired to stop the motor 28, the control member H is returned to its off position. When the control member is returned to this position it completes an energizing circuit for the program motor 61 in the reverse direction from the negative side of the supply source 88, through the switch contact 18d with which the control arm 18a engages, the conductor 95, th

closed switch 14, the conductor 88, the reverse fleld winding 88 of the program motor and thence through motor and conductor 8| to the positive side of the supply source 88. This operation will cause the program motor to return the cam shaft 88 to its position shown in Fig. 3. It will be observed that when the shaft is returned to this position, the switches 14 and 15 will be opened, the program motor being deenergized by the opening of the switch 14.

It will be observed that during this operation of the impeller motor 28, the lamp 12 will be energized from the negative side of the supply source 88, through the switch arm 18a, switch contact 180, the conductor 82, a conductor 81 and thence through the lamp 12 to the positive side of the supply source 88.

If it be desired to effect a rinsing action on the dishes in the vat, the rinsing action to take place for an interval of time as determined by the will of the attendant, the control member 1| will be moved in a counter-clockwise direction to its rinse position, as shown in Fig. 3. When the control arm is moved to this position, the switch arm 18a will close the switch contact We and also will close the switch contact 18c. When the contact 18c is closed, the program motor 61 will be energized to move in a forward direction through the limit switch 18. The motor 81 will operate the cam shaft in a clockwise direction until the depression 82a of cam 82 permits the switch 18 to open. In this position of the cam shaft 68, the switches 14 and 15 again will be closed, the switch 58 will be opposite the depression 82?; of the cam 52 and therefore will be in its open position so that the impeller motor 28 will not operate; the fluid supply valve 35, however, will be opened, by reason of the fact that the cam 63 will occupy such a position that the switch 58 will be closed so as to effect the energization of the operating coil of the electromagnet 31 to open the inlet valve; the detergent valve 53 will remain closed by reason of the fact that the switch 60 will remain in the depression 58a of the cam 88; and the drain valve will remain open by reason of the fact that the switch 6| will remain open. As before, the incandescent lamp 12 will be energized through switch contact 180. During this operation, therefore, fluid will flow to the reaction spray device of the vat through the open fluid control valve 35.

If the control member 1| be returned to the oifposition, the program motor 81 will be energized in the reverse direction through the switch 14 as before, so as to return the cam shaft 88 to its position shown in Fig. 3. However, if the control arm be moved from its rinse position in a counter-clockwise direction to its wash position, the master switch control arm 180 will close the contact 18f, which operation will energize the program motor 81 to advance the cam shaft 88 in the forward direction under the control of the limit switch 18. The program motor will advance the cam shaft until the depression 8|a of the cam 8| permits the limit switch 18 to open. In this position of the cam shaft, the

switches

18 and 15 will be closed; the impeller driving motor 28 will be energized through the operating coil of the electromagnet 88, and the switch 58, which will be closed by the lift 820 of cam 62; the inlet valve electromagnet 31 will be energized to open the inlet valve through the switch 840, controlled by electromagnet 84, and the switch 58, which will be closed by the lift 83!) of cam 63; the detergent valve 53 will be opened by reason of the fact that the electromagnet 88 will be energized through the switch 88, which will be closed by lift 88b of cam 88; the drain valve electromagnet 48 will be energized to close the drain valve 8| by reason of the fact that the switch 8| will be closed by the lift 88b of cam 85; and the incandescent lamp, as before, will be energized through the switch contact 18c.

Under these conditions, water will flow into the vat and will be caused to accumulate therein by reason of the fact that drain valve II is closed. The load imposed upon the impeller driving motor will increase and as a result thereof, its armature current will increase. Eventually the armature current will attain such a magnitude that the electromagnet 84 will be energized sufliciently to open the switch 84a which will effect the deenergization of the magnet 81 and thereby the closure of the fluid supply valve 88. This not only shuts OK the supply of cleansing fluid, but also shuts oi! the supply of detergent to the vat since when the fluid supply valve is closed it cuts off fluid from the detergent reservoir 58. The impeller driving motor 28 will remain energized to effect a washing action on the dishes. When the control member 1| is returned to its oi! position, the program motor 81 will be energized through the switch 18 to return the cam shaft 88 to its position shown in Fig. 3.

As pointed out previously, the control member 1| is moved in a clockwise direction from its "01! position in order to effect the automatic cycle. The control member 1| is moved in a clockwise direction to the second of its controlling positions in the automatic range to initiate the washing cycle. In this position, the switch arm 18a closes the switch contact 18g. This operation of the control arm completes an energizing circuit for the program motor 81 to operate in the forward direction; this circuit is traced from the negative conductor of the supply source 88, through the switch arm 18a, the switch contact 189, the conductor 88, the conductor 88, the forward winding 88 of the program motor, and thence through the motor and the conductor 8| to the positive side of the supply source 88. The program motor, therefore, begins to operate the shaft 55 in a clockwise direction. The

switches

18 and 15 are closed almost immediately, and the switch 58 controlling the water supply valve 85 is also closed about the same time by cam lift 83:: of cam 83. The electromagnet 81, therefore, is energized from the negative conductor of the supply source 88, through the switch arm 18a, the switch contact 18h, the conductor 83, the switch 84a, the switch 58 and thence through the operating coil of the electromagnet 81 and the conductor- 8| to the positive side of the supply source. The detergent valve 53, however, remains closed, while the drain valve 8| remains open. Thus, cleansing water is supplied to the vat through the valve 35 to effect a rinsing action through the reaction spray device, the water gravitating to the bottom of the vat flowing directly to the drain.

The incandescent lamp 12 will be energized through the switch contact 18h.

After the program motor 81 has been started by the operation of the switch arm 18a to the switch contact 189 the control member 1| is moved in a counter-clockwise direction to the first controlling position in the automatic range, in which position the control arm 18a closes the switch contact 181. This maintains an energizing circuit for the program motor to operate in the forward direction through the closed switch 15. The purpose for this shifting ofthe control member If will be explained in greater detail hereinafter. It is preferable that the arm 150 be returned automatically to close the contact 15! when it. is released by the attendant .after having been moved to close contact 159 to start the program motor. This may be accomplied by a suitable spring means (not shown) operating the arm.

The program motor, therefore, continues to operate the cam shaft 55 in the forward direction. The rinsing operation takes place 'until the drain valve 4| is closed by the cam 55, which operation takesplace when the lift 55b of the cam 55 engages the switch 5| to close it. This operation completes an energizing circuit for the operating coil of the electromagnet 55 through the switch contact "It, the conductor 53, the closed switch It, and thence through the operating coil of the magnet 55 and the conductor 3i to the positive side of the supply source 55. Just preceding the closure of the drain valve 5|, the motor 25 will have been energized to operate for a relatively short period by reason of the fact that the lift 52a of cam 52 will close the switch 58, and then subsequently will be deenergized for a short period when the depression 525 causes the switch 55 to open, but simultaneously with the closure of the drain valve, the motor 25 will .be energized by the lift 52c engaging the switch 58 to close it. The impeller, therefore, will be operated. Also Just prior to the closure of the drain valve II, the inlet valve35 will have been closed by reason of the fact that the depression 53a of the cam 53 permits the switch 53 to open. These controls of the impeller motor to operate temporarily and to cease operation, and the temporary closure of the supply valve 35 have no real significance in the automatic cycle, but the cams necessarily effect these controls because, as has been pointed out previously, these operations are of material importance when the apparatus is not operating in the automatic cycle, but in the manual control-range of the control member a. However, when the'drain valve it has been closed to permit the accumulation of fluid in the vat, the impeller motor 25 will be operating and fluid will be supplied to the vat through the supply valve 35. Also when the drain valve is closed, the lift 54b of the cam 55 will close the switch 50 to effect the opening of the detergent valve 53, whereby detergent will flow into the vat. Cleansing fluid will continue to flow through the valve 35 until the load imposed upon the impeller motor increases to a predetermined magnitude, whereupon the electromagnet 94 will open the switch 95a to effect the closure of the valve 35 to shut off the supply of water to the vat.

This washing operation will continue until the depressions 53c, 54c and 550 of the cams 53, 55 and 55 permit their associated switches 55, 55 and 5| to open. When this occurs, the detergent valve 53 is closed and the drain valve 5| is moved to its open position. This is the first drain period in the automatic cycle. As the cams'continue to advance, however, the lifts 53d, 55d and 55d of the cams 53, 54 and 55 close their associated

switches

59, 55 and 5| so that water is again supplied to the vat through the valve 35 and detergent through the valve 53, while the drain-valve II will be closed. It is to be understood that the switch 55a will be closed at this time because the load upon the impeller will have been removed by the draining operation,

.and will be subsequently opened to shut the sup- The washing operation will continue until the depression 55d of the cam 55 permits the switch 5i to open, therebyeifecting the opening of the drain valve II to effect the second draining operation. Simultaneously with this operation, the depression 55c of the cam 64 will allow the switch 55 to open to effect the closure of the detergent valve 53 and the depression 53c of cam 53 will open the switch 59 so as to maintain the supply valve 35 closed. Also the depression 52d of cam 52 will permit the switch 55 to open, gl'iereby deenergizing the impeller driving motor The program motor will continue to advance the cam shaft, and at the end of the second draining period, the lift 53! of cam 53 will again close the switch 59 so as to effect the opening of the fluid supply valve 35. Fluid, therefore, will flow into the vat through the reaction spray device so as to effect a final rinsing action on the dishes in thevat. During this operation, the detergent valve 53 will remain closed, while the drain valve M will remain open; the impeller driving motor will remain deenergized. This" final rinsing operation will continue until the depression 53; of cam 53 permits the switch 59 to open, whereupon the inlet valve 35 is closed.

The program motor 51 continues to drive .the shaft 55 for a short interval until the depression llaof cam 11 permits the switch 15 to open, which operation deenergizes the program motor 51. It will now be understood why the control arm is moved from the second to the first controlling position in the automatic control, referred to above. If the forward control circuit for the program motor through switch contact lilowere maintained, the program motor would not automatically deenergize itself at the completition of the automatic cycle; it is for this reason that the control arm is shifted to close contact 151' after the program motor has started so as to'shift its energizing circuit through switch 15, which does open at the end of the washing cycle to deenergize the program motor.

The lamp '2 remains energized until the control member H is returned to its off position. When this occurs, the lamp is deenergized by movement of the switch arm 10a from the contact 10h.

The apparatus is now in condition for a subsequent automatic control, or a manual control by operation of the control lever H in a counter clockwise direction.

During the automatic cycle, it will be observed that the limit switches l8, l9 and 50 will effect no controlling action on the program motor.

While I have shown a particular embodiment of my invention, it will be understood, of course, that I do not wish to be limited thereto since many modifications may be made, and I, therefore, contemplate by the appended claims to cover any such modifications as fall within the true spirit and scope of my invention.

What I claim as new and desire to secure by Letters Patent of the United States is:

1. Dishwashing apparatus comprising a vat, a liquid supply conduit communicating with said vat, a valve controlling said conduit, a drain valve for said vat, switches controlling the operation of said liquid supply and drain valves, a program motor, a shaft driven by said program motor controlling said switches to operate them so as to effect different operating conditions of said valves by operation of said shaft to predetermined angular positions, a plurality of limit switches controlling said program motor operated by said motor and operable to cause said motor to stop when said shaft attains said positions respectively, and a master switch arranged to establish energizing circuits for said program motor through said limit switches respectively when operated to selected controlling positions so as to selectively control the position to which said motor drives said shaft. I

2. Dishwashing apparatus comprising a vat, a liquid supply conduit communicating with said vat, a valve controlling said conduit, a drain valve for said vat, liquid circulating means, a driving motor for said liquid circulating means, a plurality of switches controlling the operation of said valves and; said driving motor respectively, a plurality of cams controlling the operation of said switches respectively, a program motor connected to said cams to drive them, a plurality of limit switches controlling said program motor to stop the operation. of said cams in preselected angular positions with reference to a predetermined initial position, cams driven by said program motor controlling said limit switches respectively, a master switch controlling the energization of said program motor through said limit switches respectively by operation of said master switch to selected controlling positions, whereby said cams are operated to any one of said angular positions by operation of said master switch to a corresponding controlling position, an auxiliary switch for completing an energizing circuit for said program motor to return said cams to said initial position when said master switch is moved to a predetermined controlling position, said master switch completing an energizing circuit for said program motor independently of said limit switches when moved to another predetermined controlling position so as to effect continuous operation of said cams to successive controlling angular positions, a second auxiliary switch completing an energizing circuit for said program motor to drive said cams to said successive controlling angular positions when said master switch is moved to still another controlling position and a cam driven by said program motor controlling said second auxiliary switch to deenergize said program motor when said cams have been operated to a predetermined angular position.

3. Dishwashing apparatus comprising a vat, a liquid supply conduit communicating with said vat, a valve controlling said conduit, a drain valve for said vat, liquid circulating means, a driving motor for said liquid circulating means, electroresponsive devices controlling the operation of said liquid supply and drain valves respectively, a plurality of switches controlling the operation of said electroresponsive devices and said driving motor respectively, a plurality of cams controlling the operation of said switches respectively, a shaft for operating said cams, a program motor, a driving connection between said program motor and said shaft, a plurality of limit switches controlling said program motor to stop the operation of said shaft in preselected angular positions with reference to a predetermined initial position, cams driven by said shaft controlling said limit switches respectively, a master switch controlling the energization of said program motor through said limit switches respectively by operation of said master swit'ch to selected controlling positions irom an initial ofl' position, whereby said shalt is driven to any one of said angular positions by operation of said master switch to a corresponding controlling position, said cams being arranged so that in one of said positions of said shaft, said impeller motor alone is operated, in another of said positions both of said liquid supply and drain valves are open, and in still another position said impeller motor is operated while said liquid supply valve is open and said drain valve is closed, an auxiliary switch, a cam on said shaft controlling said auxiliary switch, connections between said master switch, said auxiliary switch and said program motor arranged to complete an energizing circuit for said program motor to return said shaft to saidinitial position from any one of said angular positions when said master switch is returned to said initial 01'1" position, whereupon said cam provides for the operation of said auxiliary switch to control said program motor to stop, connections between said program motor and said master switch arranged so that when said master switch is moved to another controlling position, an energizing circuit for said program motor is completed independently of said limit switches to drive said shaft continuously to said successive controlling angular positions from said initial position so that said cams efiect the operation of said liquid supply and drain valve and said impeller driving motor in a predetermined sequence to effect a predetermined washing cycle, a second auxiliary switch completing an energizing circuit for said program motor to drive said shaft to said successive controlling angular positions when said master switch is moved to still another controlling position and a cam driven by said shaft controlling said second auxiliary switch to deenergize said program motor when said shaft has been returned to said initial position.

4. Washing apparatus comprising a washing vat, liquid supply and drain valves for said vat, a control member controlling the operation of said valves between their open and closed positions movable to a plurality of controlling positions to control the admission of liquid to the vat and the drainage of liquid from the vat in a predetermined cycle of operation, a driving motor for said control member, a plurality of limit switches corresponding to said positions of said control member operated by said motor, and a control switch for said motor to establish energizing circuits therefor through said limit switches respectively when operated to selected controlling positions corresponding to said positions of said control member, the limit switches being operated by said motor to positions corresponding to said positions of said control member to stop the motor when the control member attains the selected one of said positions.

5. Washing apparatus comprising a washing vat, control elements for admitting liquid to and draining it from the vat, and for circulating liquid in the vat, a control member controlling the operation of said elements movable to a plurality of controlling positions to establish a predetermined series of operations in a washing cycle, a motor for moving said control member, a plurality of limit switches corresponding to said positions controlling said motor, each operated by said motor to cause said motor to stop when said control member attains the corresponding controlling position, and a control switch for said motor to establish energizing circuits therefor through said limit switches respectively when operated from an "off" position' to selected controlling positions corresponding to the controlling positions of said control member so as to selectively control the. position to which said member is moved by said motor, and when returned to said "of!" position to reverse the operation of said motor to return said control member to its initial position.

6. Washing apparatus comprising a washing vat, control elements for admitting liquid to and draining it from the vat, and for circulating liquid in the vat, a shaft controlling the operation of said elements movable to a plurality of controlling positions to establish a predetermined series of operations in a washing cycle, a motor for moving said shaft to its controlling positions, a plurality of limit switches corresponding to said positions. each controlling said motor to stop it when said shaft attains the corresponding controlling position, a control switch for said motor to establish energizing circuits therefor through said limit switches respectively when operated from an "o position to selected controlling positions corresponding to said controlling positions of said shaft, and to establish energizing circuits for said motor to drive said shaft continuously through said controlling positions when operated to another controlling position.

7. Washing apparatus having a washing vat, a plurality of control elements movable to controlling positions to control the admission of liquid to said vat, the circulation of liquid in said vat and the drainage of liquid from saidvat, electroresponsive means controlling the operation of said'control elements to said positions, switches controlling said electroresponsive means, a shaft, cams on said shaft controlling said switches, a motor to operate said shaft, switches controlling said motor, cams on said shaft controlling said last-named switches, a master switch, electrical connections between said master switch, said cam controlled switches, said eleotroresponsive means and said motor controlled so that when said master switch is moved from its on position to any of a number of preselected controlling positions, said motor is energized to move said shaft to a selected controlling position corresponding to the position said master switch is in, and when said master switch is moved to another controlling position said motor operates said shaft continug CERTIFICATE OF CORRECTION.

Patent No. 2,155,273.

April 18; 939

' BENJAMIN w. JonEs.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correct ion as follows: Page 5, first column, line 72, after "varied" insert theword during; page 5, first column, line 8-, for "accomplied" read accomplished; and second column, line 1 2-1 3, for "completition' read completion; and that the said Letters Patent should 'be read with this correction therein that the same may conform to the record ofthe case in the Patent Office.

Signed and sealed this 50th day or May, A. D. 1939.

(Seal) Henry Van Arsdale Acting Commissioner of Patents.