US3885580A - Dishwasher control system - Google Patents

Dishwasher control system Download PDF

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US3885580A
US3885580A US45783774A US3885580A US 3885580 A US3885580 A US 3885580A US 45783774 A US45783774 A US 45783774A US 3885580 A US3885580 A US 3885580A
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pump
pressure
float
liquid
washing chamber
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Donald S Cushing
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General Electric Co
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General Electric Co
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    • AHUMAN NECESSITIES
    • A47FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47LDOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00Washing or rinsing machines for crockery or tableware
    • A47L15/42Details
    • A47L15/4244Water-level measuring or regulating arrangements
    • DTEXTILES; PAPER
    • D06TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06FLAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F39/00Details of washing machines not specific to a single type of machines covered by groups D06F9/00 - D06F27/00 
    • D06F39/08Liquid supply or discharge arrangements
    • D06F39/087Water level measuring or regulating devices
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H35/00Switches operated by change of a physical condition
    • H01H35/18Switches operated by change of liquid level or of liquid density, e.g. float switch
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00Fluid handling
    • Y10T137/7287Liquid level responsive or maintaining systems
    • Y10T137/729Washing machine cycle control

Abstract

A liquid level responsive switch assembly for a dishwasher or like washing appliance including a movable liquid-displaceable member, within the washing chamber, having a plunger extending through an opening in the chamber bottom and operably connected to a switch located outside the chamber, the switch being adapted for positioning to an upper or lower position by vertical movement of the liquid-displaceable member as the liquid level changes within the chamber, said liquid level responsive switch assembly further including movable lever means extending through a second opening in the chamber bottom, said lever means being adapted to hold said movable liquid-displaceable member in its uppermost position when there exists a positive liquid pressure at the pump outlet of the washing appliance, thereby preventing switch movement as a consequence of a temporary liquid level drop within the washing chamber of the appliance.

Description

United States Patent Cushing May 27, 1975 [54] DISHWASHER CONTROL SYSTEM [75] Inventor: Donald S. Cushing, Louisville. Ky. [57] ABSTRACT Assigneei General Elecil'ic p y1 A liquid level responsive switch assembly for a dish- Louis il ev Ky washer or like washing appliance including a movable [22] Filed Apr 4 I974 liquid-displaceable member, within the washing chamher. having a plunger extending through an opening in [21] APPL bio-1457337 the chamber bottom and operably connected to a switch located outside the chamber, the switch being [52] U 5 Cl H 134/57 73/306, [37/387 adapted for positioning to an upper or lower position [51] l l H 8'08!) 3/02 by vertical movement of the liquid-displaceable mem- [58] Fieid 307/118. 134/56 D 57 bet as the liquid level changes within the chamber,
137/383]. 68/184, 73/306 said liquid level responsive switch assembly further ineluding movable lever means extending through a sec- 0nd opening in the chamber bottom, said lever means [56] References Cited bei ng adapted to hold said movable llqUlCl- UNITED STATES PATENTS displaceable member in its uppermost position when L 7/195' Clark 134/57 D there exists a positive liquid pressure at the pump out- 3. 7/1967 Slewa" at let of the washing appliance, thereby preventing 3334.651 g 137,387 switch movement as a consequence of a temporary 105197! D X liquid level drop within the washing chamber of the 3:72l:783 3/1973 Hancock H 134/56 1) x PP Primary Examiner-Robert L. Bleutge 7 Claims, 3 Drawing Figures f 42 it DISHWASHER CONTROL SYSTEM BACKGROUND OF THE INVENTION The prior art suggests several control systems commonly employed to coordinate the operation of the pump with respect to the liquid level in the washing chamber of an article washing machine such as a dishwasher. See, for example, US. Pat. Nos. 2,646,067; 3,464,437; and 3,478,373. The operational cycle of such a machine often begins with a fill step that involves actuation of a solenoid operating a water inlet valve, that is caused to open and allow a liquid flow into the wash chamber of the machinev Various means are available to control the fill operation, such as timer controls or pressure sensitive switches. The possibility of control failure is inherent so, generally, a fail-safe means of preventing washing chamber overflow is employed. A liquid level responsive switch, such as shown in US. Pat. No. 3,464,437, is the type of dependable fail-safe mechanism often utilized. Such a fail-safe mechanism usually comprises a buoyant member or float in the washing chamber, which includes a linkage arrangement to an electrical switch outside the chamber, so that when the liquid level in the washing chamber rises to a predetermined level, the float rises and activates a switch, which, in turn, cuts off the current to the solenoid that holds the inlet valve open and allows current to flow to the pump motor.
However, certain problems exist with the abovedescribed assembly which tend to detract from its efficiency and useful life. One such problem is that during the washing cycle the liquid level in the washing machine varies considerably and may from time to time fall to a point low enough to allow the float to drop and trigger the electrical switch, thus stopping the motor and resetting the inlet valve solenoid, which, in turn, allows more liquid to flow into the washing machine, thus creating an overfill situation.
Another problem that has been associated with the liquid level responsive switch in a washing machine relates to excessive wear in the electrical switch of the assembly. Such excessive wear results from the fact that circulation and agitation of washing liquid in the lower portion of the washing chamber tend to impart corresponding agitation or random motion and oscillation to the float, which motion is translated through the vertical plunger to the electrical switch. Though the motion may not be so extreme as to actuate the switch, the constant motion and resulting friction to the parts of the switch tend to materially shorten the operating life thereof.
The present invention overcomes these prior art problems and provides a simple, inexpensive, readily constructed and easily maintained, liquid level responsive switch assembly which prevents the float of the assembly from falling to a level which would stop the pump motor and actuate the till mechanism. It thereby prevents overfilling of the washing chamber and eliminates random agitation and oscillation of the float member of the assembly, thereby increasing the useful life of the switch component of the assembly.
SUMMARY OF THE INVENTION The invention includes a liquid level responsive switch assembly which is useful in preventing the washing machine from filling at any time when the pump is exerting a positive liquid pressure at its outlet. Specifically, during the wash and rinse cycles and during the drain cycles, the positive pump pressure actuates a lever means which holds a float in its uppermost buoyed position to keep a solenoid control switch closed, thereby preventing washing liquid from entering the washing chamber. However, when the pump begins to cavitate at the end of a drain cycle, the positive liquid pressure at the pump outlet is lost and the float within the washing chamber is allowed to drop, thereby permitting actuation of the fill mechanism.
More specifically, the invention includes a dishwasher of the type having a washing chamber, spray means contained within said washing chamber for distributing a washing liquid therein, a pump in flow communication with the spray means for delivering the washing liquid to the spray means, a motor driving the pump, an electrical control circuit for regulating the motor and providing various cycles of operation of the dishwasher, and a switch assembly operatively connected to the electrical control circuit of the dishwasher, and pressure activated control means in pressure communication with the outlet of the pump adapted to operate the switch assembly in response to pressure changes at the outlet of the pump. The switch assembly is advantageously a liquid level responsive switch assembly and the pressure activated control means is normally adapted to maintain the switch assembly in a preset position as a consequence of a positive liquid pressure being exerted by the pump at its outlet. Preferably, the switch assembly includes a float member within the washing chamber capable of being buoyed from a first to a second position in response to a change of liquid level in the washing chamber and a movable plunger connected to the float member which projects through an opening in a bottom wall of the washing chamber. The switch assembly further includes an electrical switch positioned outside the washing chamber operated by the plunger in response to movement of the float. Also, the pressure activated control means preferably includes support means, such as a lever, as the means adapted to maintain the float in its second position.
DESCRIPTION OF THE DRAWINGS FIG. I is a side elevational view of a dishwasher with the sidewall thereof cut away to illustrate the machines internal components.
FIG. 2 is a side elevational view of the liquid level responsive switch assembly of this inventionv FIG. 3 is a schematic diagram of a portion of an electrical circuit for a dishwasher showing an electrical switch in accordance with the present invention.
DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 1 shows a dishwasher having a cabinet 10 including a front wall 11, a rear wall 12 and opposed side walls 13 and 14. Enclosed by these walls is washing chamber 17 which includes a bottom wall 16 separating the washing chamber 17 from the motor and pump area 18, which contains the motor-pump unit 19.
In operation of the dishwasher assembly of FIG. I, soiled tableware is placed on the racks 23 and 24 within the washing chamber 17. A timer control means 55 is then set to initiate the wash cycle of the machine. Generally, the wash cycle includes a number of rinse and wash steps that are sequentially actuated by the timer control which is part of the electrical control circuit shown in FIG. 3. In practice. the timer control 55 will generally first allow current to flow through the control circuit, containing a solenoid S2 controlling the water inlet valve, to permit a flow of water to enter the washing chamber. After the water in the washing chamber 17 rises to a predetermined level, switch 50 moves to its up" position and a motor 190 located in the lower compartment 18 of the cabinet is actuated to drive the pump 19b which pumps the water upwardly through a vertically extending conduit 20. The water then flows from the conduit 20 into a rotatable hollow spray arm 21 having a plurality of spaced-apart orifices 22 therein for directing the water therefrom in a spray pattern upwardly over the soiled tableware supported in the racks 23 and 24. Generally, one or more of the orifices 22 of the spray arm 21 are disposed in such a manner so as to provide a propelling jet stream, thereby causing the spray arm to rotate on a central vertical axis to insure uniform washing of the soiled tableware in the racks 23 and 24. After being sprayed on the soiled tableware, the water collects on the washing chamber floor portion 16 and is continuously recirculated through the pump to cleanse the soiled tableware.
1n the dishwasher of FIG. 1, a liquid level response switch assembly 29 is provided to control the amount of water which enters into washing chamber 17. in the event that the water level would temporarily drop during the wash or rinse cycle, the result would be an overfilling of the chamber 17.
The liquid level responsive switch assembly 29, as shown in FIG. 1, is positioned at a comparatively high point on the floor 16 of the wash chamber 17 to permit a normally high water level in the washing chamber 17. The normally high water level during any given step in the wash cycle is, however, below the horizontal plane in which the rotatable spray arm 21 operates. Thus, the switch assembly 29 can be located on a high point of the floor 16, yet below the plane of operation of the rotatable spray arm 21 to operate as a liquid level control means.
The improved liquid level responsive switch assembly 29 is illustrated in detail in FIG. 2. The switch assembly 29 comprises a substantially large float or liquid displaceable member 30 of a generally bulbous shape or umbrelladike configuration which has a centrally downwardiy projecting stern portion or integral plunger 31. The plunger 31 extends through a stand tube or guiding member 34 that is mounted concentrically with an opening 160 in the floor 16. As shown in FIG. 2, the lower portion of the plunger 31 extends through the opening 16a to a point below and outside the washing chamber 17 to engage lever 52 located operably above switch 50. Flexible bellows means 40 surrounds the lower end of plunger 31 and is held in concentric relationship to opening 160 by radially outwardly extending annular flange portion 41 which, in turn, is held in sealed relation to the bottom side of floor 16 by fastening means 48 in conjunction with annular flange 36.
Switch housing 51 is mounted on a convenient wall of housing 10 with lever 52 extending into operative contact with the lower portion of bellows means 40 which, in turn, is contacted by plunger 3] so that switch 50 is controlled by the liquid level in washing chamber 17 through the relative movement of float 30. Switch 50 is designed to be normally down" and will act to establish electrical current flow through the motor circuit shown in FIG. 3 when permitted to move upwardly. In the normal operative position of the switch assembly 29, the weight of the float 30 and its integral plunger 31 presses downwardly and is transmitted to lever 52, whereby switch S0 is normally depressed downwardly in its first or down position, thereby permitting electricity to flow through the fill valve solcnoid. Within the housing 51 of switch 50, a biasing means (not shown) is provided to normally urge switch 50 upwardly in a direction outwardly from the housing. When the liquid level in the lower portion of washing chamber 17 rises during the fill cycle, it causes float 30 to be displaced upwardly and thus lever 52 adjacent switch 50 is released to allow the switch to move into its uppermost or second position. After float 30 has risen and switch 50 is in its uppermost position, motor 19 starts and pressure is built up in conduit 20 downstream of the pump outlet. A pressure tap 26 is connected in flow communication with the pump outlet and, in turn, in flow communication with transducer 27. Thus, there is exerted a positive fluid pressure on transducer 27 when pump 19b is pumping washing liquidv Transducer 27 is attached to floor 16 and includes a downwardly biased piston 28 located within a cylinder portion 41. Piston 28 may include an appropriate seal member 44 attached to its upper side to prevent liquid from passing therearound and proceeding into washing chamber 17. Piston 28 is connected to L- shaped lever 42 which extends through opening 16b in floor 16 and which is slidably held in concentric position within cylinder portion 41 by support means 45. The free end of lever 42 is juxtapositioned below one edge of float 30 so that when a positive liquid pressure forces piston 28 upwardly against the biasing force of spring 43, this free end engages and holds float 30 in its uppermost position. Such an arrangement, being referred to collectively as a pressure activated support means, thereby insures that float 30 will not cause switch 50 to move even if the liquid level in the washing chamber 17 should temporarily drop to a level which would normally permit float 30 to drop to a level which would cause motor to stop and the fill solenoid to be reactivated. Thus, during the entire wash cycle, as well as the rinse and drain cycle, float 30 will be held in its uppermost position and switch 50 will allow cur rent to flow to motor 19. Only at the end of the drain cycle, when the pump begins to cavitate from a lack of water, will the pressure in the pressure tap 26 drop, thus allowing piston 28 to drop and, consequently, float 30 to drop, shutting off motor 19 and reactivating the fill solenoid.
Having thus described the invention, what is claimed 1. In a dishwasher of the type having a washing chamber, spray means contained within said washing chamber for distributing washing liquid therein, a pump in flow communication with said spray means for delivering said washing liquid to said spray means, a motor driving said pump and an electrical control circuit for regulating said motor and providing various cycles of operation of said dishwasher, the invention comprising: (a) a switch assembly operatively connected to the electrical control circuit of the dishwasher; and (1)) pressure activated control means in pressure communication with the outlet of said pump adapted to operate said switch assembly in response to pressure changes at the outlet of said pump.
2. The combination set forth in claim 1 wherein said switch assembly is a liquid level responsive switch assembly and said pressure activated control means is adapted to maintain said switch assembly in a preset position as a consequence of a positive liquid pressure being exerted by said pump at its outlet.
3. The combination set forth in claim 2 wherein said switch assembly includes a float member within said washing chamber capable of being buoyed from a first to a second position in response to a change of liquid level in said washing chamber, and a movable plunger connected to said float member and projecting through an opening in a bottom wall of said washing chamber, and an electrical switch positioned outside said washing chamber operated by said plunger in response to movement of said float, and said pressure activated control means includes support means adapted to maintain said float in its second position.
4. The combination set forth in claim 3 wherein said dishwasher further includes a substantially vertical stand tube having a longitudinal passage therethrough for operably receiving said plunger therein. and bellows means in combination therewith acting normally to contain said plunger in its position relative said wash chamber.
5. The combination set forth in claim 3 wherein said pressure activated control means comprises a pressure tap connected in flow communication with said pump outlet and in flow communication with a transducer. said transducer being operably attached to L-shaped lever means juxtapositioned below one edge of said float to maintain said float in its second position as a consequence of pressure liquid pressure being exerted by said pump at its outlet.
6. The combination set forth in claim 5 wherein said transducer comprises a downwardly biased piston located within a cylinder portion, said piston having said L-shaped lever attached thereto in slidable relationship to said cylinder and supported therefrom to allow movement of said piston and said lever as a unit within said cylinder.
7. The combination set forth in claim 6 wherein said piston further includes a seal member attached to its upper side to prevent liquid from passing between said cylinder and said piston.

Claims (7)

1. In a dishwasher of the type having a washing chamber, spray means contained within said washing chamber for distributing washing liquid therein, a pump in flow communication with said spray means for delivering said washing liquid to said spray means, a motor driving said pump and an electrical control circuit for regulating said motor and providing various cycles of operation of said dishwasher, the invention comprising: (a) a switch assembly operatively connected to the electrical control circuit of the dishwasher; and (b) pressure activated control means in pressure communication with the outlet of said pump adapted to operate said switch assembly in response to pressure changes at the outlet of said pump.
2. The combination set forth in claim 1 wherein said switch assembly is a liquid level responsive switch assembly and said pressure activated control means is adapted to maintain said switch assembly in a preset position as a consequence of a positive liquid pressure being exerted by said pump at its outlet.
3. The combination set forth in claim 2 wherein said switch assembly includes a float member within said washing chamber capable of being buoyed from a first to a second position in response to a change of liquid level in said washing chamber, and a movable plunger connected to said float member and projecting through an opening in a bottom wall of said washing chamber, and an electrical switch positioned outside said washing chamber operated by said plunger in response to movement of said float, and said pressure activated control means includes support means adapted to maintain said float in its second position.
4. The combination set forth in claim 3 wherein said dishwasher further includes a substantially vertical stand tube having a longitudinal passage therethrough for operably receiving said plunger therein, and bellows means in combination therewith acting normally to contain said plunger in its position relative said wash chamber.
5. The combination set forth in claim 3 wherein said pressure activated control means comprises a pressure tap connected in flow communication with said pump outlet and in flow communication with a transducer, said transducer being operably attached to L-shaped lever means juxtapositioned below one edge of said float to maintain said float in its second position as a consequence of pressure liquid pressure being exerted by said pump at its outlet.
6. The combination set forth in claim 5 wherein said transducer comprises a downwardly biased piston located within a cylinder portion, said piston having said L-shaped lever attached thereto in slidable relationship to said cylinder and supported therefrom to allow movement of said piston and said lever as a unit within said cylinder.
7. The combination set forth in claim 6 wherein said piston further includes a seal member attached to its upper side to prevent liquid from passing between said cylinder and said piston.
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Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4097307A (en) * 1976-12-17 1978-06-27 Hobart Corporation Fill control for an automatic dishwasher
US4168615A (en) * 1978-05-17 1979-09-25 General Electric Company Clothes washing machine with water recirculation
US4178957A (en) * 1978-11-20 1979-12-18 White Consolidated Industries, Inc. Dishwasher fill system
US4180085A (en) * 1978-11-03 1979-12-25 White Consolidated Industries, Inc. Dishwasher fill float
US4180095A (en) * 1977-11-21 1979-12-25 White Consolidated Industries, Inc. Dishwasher float switch control assembly
EP0012951A1 (en) * 1978-12-26 1980-07-09 International Business Machines Corporation Data processing system including a data storage control unit
US4271861A (en) * 1979-10-11 1981-06-09 General Electric Company Dishwasher fill level control arrangement
US4289154A (en) * 1979-11-29 1981-09-15 The Maytag Company Self-cleaning float mechanism
EP0263550A1 (en) * 1986-09-20 1988-04-13 Bauknecht Hausgeräte GmbH Control system for a valve in a dishwasher or the like
US5010920A (en) * 1989-04-05 1991-04-30 Aktiebolaget Electrolux Device for emptying water from a dishwasher
US5018550A (en) * 1990-10-19 1991-05-28 Whirlpool Corporation Dishwasher overfill protection device
US5267580A (en) * 1991-12-30 1993-12-07 Tca, Inc. Dishwashing machine and method
US5309939A (en) * 1990-09-18 1994-05-10 Bosch-Siemens Hausgerate Gmbh Safety device for water-conducting household appliances
US5365969A (en) * 1994-01-21 1994-11-22 White Consolidated Industries, Inc. Float with skirt to prevent leakage due to oversudsing
TR26288A (en) * 1991-08-01 1995-02-15 Bosch Siemens Hausgeraete water carrier home appliance
EP1344861A2 (en) * 2002-03-12 2003-09-17 BITRON S.p.A. An adjustable and double insulated system for controlling the water level in a domestic appliance
US20120125369A1 (en) * 2009-08-05 2012-05-24 Electrolux Home Products Corporation N.V. Washer, Such As A Dishwasher Or A Washing Machine, And Method For Operating A Washer
US8845814B2 (en) 2009-08-05 2014-09-30 Electrolux Home Products Corporation N.V. Washer such as a dishwasher or a washing machine and method for operating a washer
US9751115B2 (en) 2009-08-05 2017-09-05 Electrolux Home Products Corporation N.V. Washer such as a dishwasher or a washing machine and method for operating a washer

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Publication number Priority date Publication date Assignee Title
US2562772A (en) * 1945-04-14 1951-07-31 Westinghouse Electric Corp Dishwashing apparatus having impeller-operated means for controlling water supply
US3331374A (en) * 1965-10-04 1967-07-18 Bruce E Stewart Water level control
US3334651A (en) * 1964-05-26 1967-08-08 Whirlpool Co Liquid level control
US3464437A (en) * 1967-10-12 1969-09-02 Design & Mfg Corp Overflow protection device
US3610271A (en) * 1970-04-15 1971-10-05 Whirlpool Co Liquid level control
US3721783A (en) * 1971-07-27 1973-03-20 Westinghouse Electric Corp Overflow float arrangement for dishwasher

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2562772A (en) * 1945-04-14 1951-07-31 Westinghouse Electric Corp Dishwashing apparatus having impeller-operated means for controlling water supply
US3334651A (en) * 1964-05-26 1967-08-08 Whirlpool Co Liquid level control
US3331374A (en) * 1965-10-04 1967-07-18 Bruce E Stewart Water level control
US3464437A (en) * 1967-10-12 1969-09-02 Design & Mfg Corp Overflow protection device
US3610271A (en) * 1970-04-15 1971-10-05 Whirlpool Co Liquid level control
US3721783A (en) * 1971-07-27 1973-03-20 Westinghouse Electric Corp Overflow float arrangement for dishwasher

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4097307A (en) * 1976-12-17 1978-06-27 Hobart Corporation Fill control for an automatic dishwasher
US4180095A (en) * 1977-11-21 1979-12-25 White Consolidated Industries, Inc. Dishwasher float switch control assembly
US4168615A (en) * 1978-05-17 1979-09-25 General Electric Company Clothes washing machine with water recirculation
US4180085A (en) * 1978-11-03 1979-12-25 White Consolidated Industries, Inc. Dishwasher fill float
US4178957A (en) * 1978-11-20 1979-12-18 White Consolidated Industries, Inc. Dishwasher fill system
EP0012951A1 (en) * 1978-12-26 1980-07-09 International Business Machines Corporation Data processing system including a data storage control unit
US4271861A (en) * 1979-10-11 1981-06-09 General Electric Company Dishwasher fill level control arrangement
US4289154A (en) * 1979-11-29 1981-09-15 The Maytag Company Self-cleaning float mechanism
EP0263550A1 (en) * 1986-09-20 1988-04-13 Bauknecht Hausgeräte GmbH Control system for a valve in a dishwasher or the like
US5010920A (en) * 1989-04-05 1991-04-30 Aktiebolaget Electrolux Device for emptying water from a dishwasher
US5309939A (en) * 1990-09-18 1994-05-10 Bosch-Siemens Hausgerate Gmbh Safety device for water-conducting household appliances
US5018550A (en) * 1990-10-19 1991-05-28 Whirlpool Corporation Dishwasher overfill protection device
TR26288A (en) * 1991-08-01 1995-02-15 Bosch Siemens Hausgeraete water carrier home appliance
US5267580A (en) * 1991-12-30 1993-12-07 Tca, Inc. Dishwashing machine and method
US5365969A (en) * 1994-01-21 1994-11-22 White Consolidated Industries, Inc. Float with skirt to prevent leakage due to oversudsing
EP1344861A2 (en) * 2002-03-12 2003-09-17 BITRON S.p.A. An adjustable and double insulated system for controlling the water level in a domestic appliance
EP1344861A3 (en) * 2002-03-12 2006-08-23 BITRON S.p.A. An adjustable and double insulated system for controlling the water level in a domestic appliance
US20120125369A1 (en) * 2009-08-05 2012-05-24 Electrolux Home Products Corporation N.V. Washer, Such As A Dishwasher Or A Washing Machine, And Method For Operating A Washer
US8845813B2 (en) * 2009-08-05 2014-09-30 Electrolux Home Products Corporation N.V. Washer, such as a dishwasher or a washing machine, and method for operating a washer
US8845814B2 (en) 2009-08-05 2014-09-30 Electrolux Home Products Corporation N.V. Washer such as a dishwasher or a washing machine and method for operating a washer
RU2539667C2 (en) * 2009-08-05 2015-01-20 Электролюкс Хоум Продактс Корпорейшн Н.В. Washing apparatus such as dishwashing machine or washing machine and washing apparatus operation method
US9751115B2 (en) 2009-08-05 2017-09-05 Electrolux Home Products Corporation N.V. Washer such as a dishwasher or a washing machine and method for operating a washer

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