US3549294A - Automatic dishwashing machine with soak cycle - Google Patents

Automatic dishwashing machine with soak cycle Download PDF

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Publication number
US3549294A
US3549294A US22578A US3549294DA US3549294A US 3549294 A US3549294 A US 3549294A US 22578 A US22578 A US 22578A US 3549294D A US3549294D A US 3549294DA US 3549294 A US3549294 A US 3549294A
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United States
Prior art keywords
articles
timer
solution
chamber
period
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US22578A
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English (en)
Inventor
Robert R Kerr
Ben J Vallor
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Whirlpool Corp
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Hobart Corp
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Assigned to HOBART CORPORATION reassignment HOBART CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: HOBART INTERNATIONAL INC., A CORP. OF OHIO
Assigned to KITCHENAID, INC. reassignment KITCHENAID, INC. CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: HOBART CORPORATION
Assigned to TRABOH CORPORATION reassignment TRABOH CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: KITCHENAID, INC.
Anticipated expiration legal-status Critical
Assigned to EMERSON CONTRACT DIVISION, INC. reassignment EMERSON CONTRACT DIVISION, INC. CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: TRABOH CORPORATION
Assigned to WHIRLPOOL CORPORATION reassignment WHIRLPOOL CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: EMERSON CONTRACT DIVISION, INC.
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    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/42—Details
    • A47L15/4293—Arrangements for programme selection, e.g. control panels; Indication of the selected programme, programme progress or other parameters of the programme, e.g. by using display panels

Definitions

  • a tank defines a wash chamber in which racks are positioned for supporting articles having baked-on food soils.
  • a motor driven timer system automatically controls the mechanical components of the machine including a fill valve for supplying water to the chamber, a wash pump for recirculating and spraying the water onto the, articles and a drain pump for removing the water, according to a plurality of selectable predetermined cycles.
  • One of the selectable cycles consists of a soak cycle Where the water is combined with a cleaning compound to form a cleaning solution which is sprayed onto the articles.
  • the wash pump is then deenergized for approximately twelve minutes to eifect static soaking of the solution into the baked-0n food soils on the articles. Following the soak period, the wash pump is reenergized along with the drain pump to flush the food soils from the articles and to remove the soils from the chamber with the solution. This soak period is followed by pro-rinse, wash, rinse and dry periods which may also be selected without the soak period.
  • an automatic commercial or domestic dishwashing machine In order for an automatic commercial or domestic dishwashing machine to be used effectively for assisting the cleaning of heavily soiled articles such as pots and pans having baked-on food soils, it is common to preclean each article by either manually scrubbing the article or by soaking the article in a volume of water. After the bulk of the baked-on foods is removed by the manual scrubbing or the submerged soaking operation, the automatic dishwashing machine is used to remove the remaining portions of the food soils and to sanitize the articles.
  • the present invention is directed to an improved automatic dishwashing machine which provides for selecting different washing cycles, one being a soak cycle which is elfective to remove heavy food soils which have been baked-on food preparation and serving dishes, utensils and other articles.
  • the dishwasher of the invention includes an automatic timer system and a program selector switch which provides for selecting either a normal cycle including pre-rinse, wash, rinse and dry periods or a soak cycle which efiects a soaking period prior to the normal cycle.
  • the timer system actuates a solenoid fill valve in the hot Water supply line and also actuates the drain system to purge the supply line and assure that a charge of hot water is supplied to the wash chamber of the machine.
  • a granulated cleaning compound is added to the water within the chamber, and the timer system actuates a main recirculating pump which sprays the solution of water and cleaning compound onto the soiled articles supported by racks within the wash chamber.
  • the timing system then deenergizes the recirculating pump for a period of approximately twelve minutes to efiect static soaking of the solution into the baked-on food soils on the articles and causing a breakdown of the soils.
  • the solution is retained within the sump of the wash chamber during the soaking period after which the main recirculating pump is reenergized along with the drain pump causing the food soils to be flushed from the articles and to be drained from the wash chamber with the cleaning solution.
  • the soaking period is followed by a series of wash, rinse and dry periods to complete the cycle. If the articles to be cleaned are not soiled with baked-on foods, the soak cycle may be bypassed simply by selecting the normal or full cycle causing the dishwashing machine to operate through only a series of wash, rinse and dry periods.
  • FIG. 1 is a side elevational view of a front loading dishwashing machine incorporating a timer control system constructed in accordance with the invention
  • FIG. 2 is a schematic wiring diagram of the timer control system employed in the dishwashing machine shown in FIG. 1;
  • FIG. 3 is a chart illustrating the sequence of operation of the main control timer
  • FIG. 4 is a chart illustrating the operation of an auxiliary timer
  • FIG. 5 is a chart showing the different cycles of the dishwashing machine and the positions of the corresponding selector switches for producing the cycles.
  • FIG. 1 shows a front loading automatic dishwashing machine including an outer cabinet 10 enclosing a tank 11 having a bottom 12 and defining a wash chamber 14.
  • a door 15 provides access to the wash chamber 14 and is pivotable between a horizontal open position and a vertically closed position where the door is secured by a centrally located latch 16 such as disclosed in Pat. No. 3,328,062 which issued to the assignee of the present invention.
  • a set of vertically spaced racks -17 are supported by corresponding tracks within the chamber 14 and are movable to positions extending over the open door 15.
  • the bottom 12 of the tank 11 slopes downwardly toward the center so that water collecting thereon drains into a sump 18 in which is mounted a main recirculating pump 20 driven by a motor 22 for recirculating the water through a reaction spray arm 24 over the soiled articles placed within the racks .17.
  • a drain pump 25 is mounted directly below the sump .18 and is also driven by the motor 22.
  • the drain pump 25 has an outlet connected to a drain line 26 having a normally closed solenoid actuated drain valve 27.
  • a program selector switch 30 is mounted within the upper portion of the door 15 on one side of the latch 16 and includes a series of single pole, single throw push button switches A-D which provide for selecting either a full or normal cycle, a soak cycle or a rinse and hold cycle as indicated on the chart of FIG. 5. Also located within the upper portion of the door 15 is a main timer 35 having a series of single pole, double throw switches E-I which are actuated by corresponding cams mounted on a common shaft driven by a main timer motor 36. An interior dial 38 is also connected to rotate with the time shaft and is located adjacent the upper portion of the door 15.
  • line L2 is connected to one side of program selector switch D through a door interlock switch 42 which closes in response to actuation of the latch 16 to its closed position.
  • the other side of program selector switch D is connected to the top contact of cam actuated timer switch I and also to one side of a line switch I which is closed in response to axial movement of the main timer cam shaft produced by closing of the door latch 16 and is opened by an axial camming movement of the shaftduring the final increment of rotation of the shaft.
  • the other side of line switch I and the common contact of timer switch I are connected to one side of program selector switches B and C.
  • a pilot light 43 is also connected across line L1 and the common contact of selector switches B and C.
  • the bottomcontact of timer switch I connects with the pump motor 22 and also to the bottom contact of timerswitch F by a jumper 44.
  • timer switch F connects with a blower 45 arranged in parallel with a series connection of a thermal protector switch 46 and a heating element 48 located within said blower housing.
  • the blower 45 and the heating element 48 function to provide drying of the articles within the wash chamber by directing a flow of warm air over the articles.
  • the common contact of timer switch F and the common contacts of timer switches E and G connect to the top contact of timer switch H and to one side of program selector switch A.
  • the other side of selector switch A is connected to the common side of selector switch B and to the main timer motor 36.
  • timer switch E connects to a solenoid fill valve 52 through a water level pressure safety switch 53.
  • the bottom contact of timer switch E is connected to an electrically actuated rinse agent dispenser 55 mounted within the door 15.
  • the top contact of timer switch G connects with an electrically actuated detergent cup or dispenser 58, and the bottom contact of timer switch Gi's connected to the solenoid drain valve 27.
  • the right oropposite side of program selector switch C connects with the common contact of timer switch H.
  • timer switch H also connects with one side of a cam actuated switch K of an auxiliary timer 60 which is located within the dishwashing machine cabinet below the bottom 12, but may be located within the door 15.
  • the other side of switch K is connected with the bottom contact of main timer switch H and to a motor 62 for driving the cam shaft of the auxiliary timer 60.
  • line L1 is connected directly to the fill valve 52, rinse agent dispenser 55, blower 45, detergent dispenser 58, drain valve 27, auxiliary timer motor 62, main pump motor 22, main timer motor 36 and the pilot light 43.
  • timer motor 36 remains energized until the end of the cycle when line switch I is cammed open in response to axial movement of the timer shaft by a pin (not shown) extending through the shaft and engaging a'ramp formed on the end wall of the timer.
  • the push button for the soak cycle is depressed causing program selector switches A, C and D to close and the main timer motor 36 to be energized through switches D, J, C, H and A.
  • the fill valve 52 is energized.
  • the drain valve 27 is energized to an open condition for the first minute of the cycle so that the water supply line is purged thereby assuring that only hotwater is flowing into the wash chamber before the drain valve 27 closes.
  • the main recirculating pump motor 22 is also energized during the first four minutes of the cycle causing the hot water to be recirculated and combine with a granulated cleaning compound supplied to the wash chamber before the door 15 is closed.
  • the solution of water and cleaning compound is sprayed onto the soiled articles within the racks 17, and at the endof four minutes of the cycle, timer switch H deenergizes the main time motor 36 and energizes the motor 62 of the auxiliary timer 60.
  • switch K closes thereby reenergizing the main timer motor 36 through switches C, H and A.
  • the cleaning solution soaks into or penetrates the heavy food soil on the articles and breaks down the soil so that after the soaking period, the food soils will be flushed from the articles'and drained from the wash chamber when the main recirculating pump motor 22 is reenergized with cleaning solution or with fresh water and the drain valve 27 is reenergized.
  • the cycle continues in the same manner as the full cycle and as indicated in the chart of FIG. 3.
  • timer switch K opens thereby resetting the auxiliary timer 60 for the next soak cycle.
  • an automatic dishwashing machine incorporating a timer control system constructed in accordance with the invention, provides desirable features and advantages. For example, by incorporating a soak cycle wherein a hot water cleaning solution is permitted to soak statically into the food soils on the articles for a period of at least three to five minutes and preferably for a period of between ten and fifteen minutes, while the articles are enclosed within a high humidity chamber, it has been found that extremely heavy baked-on food soils will be released from the articles so that a subsequent flushing of a hot water cleaning articles with the solution or fresh water is effective to remove the food soils from the articles.
  • the automatic dishwashing machine becomes substantially more effective in cleaning pots and pans and other food preparation articles which commonly have heavy baked-on food soils. While most of the commercially available detergents for automatic dishwashing machines have proven satisfactory as a cleaning compound for use during the soak cycle, an enzyme detergent manufactured and sold by Economics Laboratory under the trademark Pan Dandy has proven especially effective for releasing many food soils.
  • auxiliary timer 60 Another important feature is provided by the auxiliary timer 60. That is, when the soak cycle is selected, and switches A, C and D are closed, timer switch H cooperates with the auxiliary timer 60 to provide the thirteen minute dwell of the main timer so that the cleaning solution has sufficient time to penetrate the heaviest of baked-on food soils. It is to be understood, however, that the thirteen minute dwell during the soak period may also be obtained by a timer incorporating a rapid advance motor such as disclosed in Pat. No. 3,125,105 which issued to the assignee of the present invention. That is, the main timer could be programmed for the soak cycle including the thirteen minute soaking period. If a cycle other than the soak cycle was selected, the rapid advance motor would be energized at the beginning of the soaking period for quickly by-passing the soaking period.
  • dishwashing machine herein described constitutes a preferred embodiment of the invention, it is to be understood that the invention is not limited to this precise form of machine, and that changes may be made therein without departing from the scope of the invention which is defined in the appended claims.
  • a heating element in the sump of the wash chamber 14 and to provide control means for energizing said heating element during the soak period to assure maximum humidity Within the chamber 14.
  • an automatic dishwashing machine including a tank defining a Wash chamber
  • a program timer control system having means for controlling said water supplying means to introduce a predetermined volume of water within said chamber, means for controlling said recirculating means to spray said solution onto the articles Within said chamber, and means for controlling said draining means to drain said solution from said chamber,
  • timer control system comprises:
  • a dishwashing machine as defined in claim 1 including a plurality of manually actuated cycle selecting switches, said timer control system comprises a plurality of cam actuated switches, and circuit means connecting at least two of said manually actuated switches in series with at least one of said cam actuated switches during the soaking period.
  • an automatic dishwashing machine including a tank defining a wash chamber
  • a program timer control system having means for controlling said water supplying means to introduce a predetermined volume of Water within said chamber, means for controlling said recirculating means to spray said solution onto the articles within said chamber, and means for controlling said draining means to drain said solution from said chamber, and said timer control system being effective to produce a sequence of operations including a first washing period with said cleaning solution, a subsequent main washing period with said cleaning solution followed by at least one rinsing period with fresh water,
  • timer control system comprises:
  • a program timer control system having means for controlling said water supplying means to introduce a predetermined volume of water within said chamber, means for controlling said recirculating means to spray said solution onto the articles within said chamber, and means for controlling said draining means to drain said solution from said chamber, and
  • timer control system being efiective to produce a sequence of operations including a washing period with said cleaning solution followed by at least one rinsing period with fresh water,
  • timer control system comprises:
  • a program timer control system having means for controlling said water supplying means to introduce a predetermined volume of water within said chamber, means for controlling said recirculating means to spray said solution onto the articles within said chamber, and means for controlling said draining means to drain said solution from said chamber, and
  • said timer control system being effective to produce a sequence of operations including a washing period with said cleaning solution followed by at least one rinsing period with fresh water,
  • timer control system comprises:
  • means for energizing said recirculating means during saidwashing period for a predetermined time period sufficient to spray said solution on the articles means for deenergizing said recirculating means during said washing period after the articles'are sprayed with said solution, means for maintaining said recirculating means deenergized during said washing period for a total time of at least five minutes to hold said solution in static contact with the articles to cause eifective static soaking of said solution into the food soil on the articles, means for subsequently energizing said recirculating means with said cleaning solution in said chamber for a time period greater than said predetermined time period and means for subsequently actuating said drain controlling means for draining said cleaning solution from said chamher.
  • a dishwashing machine as defined in claim 8 wherein means for maintaining said recirculating means deenergized is elfective to maintain said recirculating means deenergized for a continuous period of at least ten minutes during said soaking period.
  • a dishwashing machine as defined in claim 8 wherein said timer control system comprises a main timer and an auxiliary timer each having a motor, and circuit means for deenergizing said motor of said main timer and entrgizing said motor of said auxiliary timer during said soaking period.

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US22578A 1970-03-25 1970-03-25 Automatic dishwashing machine with soak cycle Expired - Lifetime US3549294A (en)

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US (1) US3549294A (enExample)
CA (1) CA921154A (enExample)
DE (1) DE2063011A1 (enExample)
FR (1) FR2083549B1 (enExample)
GB (1) GB1328866A (enExample)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3707156A (en) * 1971-07-21 1972-12-26 Hobart Mfg Co Dishwashing machine with automatic indicating signals
US3798065A (en) * 1970-11-13 1974-03-19 L Kitterman Tray washing system
US3903909A (en) * 1971-10-15 1975-09-09 Tore H Noren Apparatus for washing, rinsing, and sterilizing dishes
US3986891A (en) * 1968-06-11 1976-10-19 Rumbaugh Hugh M Self cleaning dishwasher and oven combination
US4106517A (en) * 1977-09-21 1978-08-15 General Motors Corporation Dishwasher control system with cycle reselect
US4346723A (en) * 1981-03-25 1982-08-31 Hobart Corporation Apparatus for a warewasher bypass soil collector
EP0082592A1 (en) * 1981-11-09 1983-06-29 KITCHENAID, INC. (a Delaware corporation) Dishwasher
US4468333A (en) * 1981-03-25 1984-08-28 Hobart Corporation Method for a warewasher bypass soil collector
EP0282214A1 (en) * 1987-03-07 1988-09-14 Diversey Corporation Machine dishwashing process
EP0291713A1 (de) * 1987-05-20 1988-11-23 Bosch-Siemens HausgerÀ¤te GmbH Verfahren zum Reinigen von Geschirr und Haushalts-Geschirrspülmaschine zur Durchführung des Verfahrens
US5165431A (en) * 1990-12-28 1992-11-24 Whirlpool Corporation Air flow control for a dishwasher
US6626190B2 (en) * 1999-12-21 2003-09-30 Rational Aktiengesellschaft Method for automatically cleaning cooking devices
CN112892996A (zh) * 2021-01-18 2021-06-04 熊宇 一种精密零件防锈上漆用可擦拭的浸泡装置

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS607641Y2 (ja) * 1978-01-11 1985-03-14 シャープ株式会社 食器洗浄機
AU527001B2 (en) * 1978-12-29 1983-02-10 Hobart International Inc. Warewasher bypass soil collector
DE4214188A1 (de) * 1992-04-30 1993-11-04 Licentia Gmbh Reinigungsverfahren fuer haushalt-geschirrspuelmaschinen
DE4414347B4 (de) * 1994-04-25 2007-07-05 BSH Bosch und Siemens Hausgeräte GmbH Verfahren zum Betrieb einer programmgesteuerten Geschirrspülmaschine
US7083071B1 (en) 2000-06-08 2006-08-01 Beverage Works, Inc. Drink supply canister for beverage dispensing apparatus
US6799085B1 (en) 2000-06-08 2004-09-28 Beverage Works, Inc. Appliance supply distribution, dispensing and use system method
US7754025B1 (en) 2000-06-08 2010-07-13 Beverage Works, Inc. Dishwasher having a door supply housing which holds dish washing supply for multiple wash cycles

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US2600541A (en) * 1946-10-21 1952-06-17 Johnson Co Gordon Utensil washing machine
US2664094A (en) * 1947-08-01 1953-12-29 Spragins John Harris Dishwasher
US2676598A (en) * 1952-11-17 1954-04-27 Marvin W Bowersox Apparatus for washing dishes and the like
US2710819A (en) * 1949-12-16 1955-06-14 Armour & Co Article washing method
US3049133A (en) * 1959-08-31 1962-08-14 Gen Motors Corp Dishwasher
FR1307875A (fr) * 1961-12-13 1962-10-26 Constructa Werke Gmbh Machine à laver la vaisselle avec commande automatique du courant d'eau de rinçage
US3063459A (en) * 1959-05-25 1962-11-13 Gen Motors Corp Dishwashing machine
US3125105A (en) * 1964-03-17 Fig-z a
US3183120A (en) * 1961-09-09 1965-05-11 Toscana Ind Cucine Electrodome Method of washing dishes and the like
US3384098A (en) * 1966-08-17 1968-05-21 Gen Electric Control means for automatic dishwasher
US3456462A (en) * 1967-05-01 1969-07-22 Freddy Jacob Ezekiel Combined sink and clothing and crockery washing machine
US3498304A (en) * 1968-06-11 1970-03-03 Hugh M Rumbaugh Apparatus for cleaning dishware

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3125105A (en) * 1964-03-17 Fig-z a
US2151354A (en) * 1935-10-07 1939-03-21 Robot Hand Corp Washing and drying apparatus
US2385264A (en) * 1940-10-16 1945-09-18 Gen Motors Corp Method of cleansing dishes
US2600541A (en) * 1946-10-21 1952-06-17 Johnson Co Gordon Utensil washing machine
US2664094A (en) * 1947-08-01 1953-12-29 Spragins John Harris Dishwasher
US2710819A (en) * 1949-12-16 1955-06-14 Armour & Co Article washing method
US2676598A (en) * 1952-11-17 1954-04-27 Marvin W Bowersox Apparatus for washing dishes and the like
US3063459A (en) * 1959-05-25 1962-11-13 Gen Motors Corp Dishwashing machine
US3049133A (en) * 1959-08-31 1962-08-14 Gen Motors Corp Dishwasher
US3183120A (en) * 1961-09-09 1965-05-11 Toscana Ind Cucine Electrodome Method of washing dishes and the like
FR1307875A (fr) * 1961-12-13 1962-10-26 Constructa Werke Gmbh Machine à laver la vaisselle avec commande automatique du courant d'eau de rinçage
US3384098A (en) * 1966-08-17 1968-05-21 Gen Electric Control means for automatic dishwasher
US3456462A (en) * 1967-05-01 1969-07-22 Freddy Jacob Ezekiel Combined sink and clothing and crockery washing machine
US3498304A (en) * 1968-06-11 1970-03-03 Hugh M Rumbaugh Apparatus for cleaning dishware

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3986891A (en) * 1968-06-11 1976-10-19 Rumbaugh Hugh M Self cleaning dishwasher and oven combination
US3798065A (en) * 1970-11-13 1974-03-19 L Kitterman Tray washing system
US3707156A (en) * 1971-07-21 1972-12-26 Hobart Mfg Co Dishwashing machine with automatic indicating signals
US3903909A (en) * 1971-10-15 1975-09-09 Tore H Noren Apparatus for washing, rinsing, and sterilizing dishes
US4106517A (en) * 1977-09-21 1978-08-15 General Motors Corporation Dishwasher control system with cycle reselect
US4392891A (en) * 1980-07-02 1983-07-12 Hobart Corporation Dishwasher soil collecting circuit
US4468333A (en) * 1981-03-25 1984-08-28 Hobart Corporation Method for a warewasher bypass soil collector
US4346723A (en) * 1981-03-25 1982-08-31 Hobart Corporation Apparatus for a warewasher bypass soil collector
EP0082592A1 (en) * 1981-11-09 1983-06-29 KITCHENAID, INC. (a Delaware corporation) Dishwasher
EP0282214A1 (en) * 1987-03-07 1988-09-14 Diversey Corporation Machine dishwashing process
EP0291713A1 (de) * 1987-05-20 1988-11-23 Bosch-Siemens HausgerÀ¤te GmbH Verfahren zum Reinigen von Geschirr und Haushalts-Geschirrspülmaschine zur Durchführung des Verfahrens
US5165431A (en) * 1990-12-28 1992-11-24 Whirlpool Corporation Air flow control for a dishwasher
US6626190B2 (en) * 1999-12-21 2003-09-30 Rational Aktiengesellschaft Method for automatically cleaning cooking devices
CN112892996A (zh) * 2021-01-18 2021-06-04 熊宇 一种精密零件防锈上漆用可擦拭的浸泡装置
CN112892996B (zh) * 2021-01-18 2023-05-12 太原四联重工股份有限公司 一种精密零件防锈上漆用可擦拭的浸泡装置

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Publication number Publication date
GB1328866A (en) 1973-09-05
FR2083549B1 (enExample) 1976-04-16
CA921154A (en) 1973-02-13
DE2063011A1 (de) 1971-10-07
FR2083549A1 (enExample) 1971-12-17

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Owner name: HOBART CORPORATION, WORLD HEADQUARTERS BUILDING, T

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:HOBART INTERNATIONAL INC., A CORP. OF OHIO;REEL/FRAME:004080/0758

Effective date: 19820528

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Owner name: KITCHENAID, INC.,

Free format text: CHANGE OF NAME;ASSIGNOR:HOBART CORPORATION;REEL/FRAME:004412/0911

Effective date: 19850513

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Owner name: TRABOH CORPORATION

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Effective date: 19850621

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Owner name: WHIRLPOOL CORPORATION

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Owner name: WHIRLPOOL CORPORATION,STATELESS

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