US2859755A - Dishwasher - Google Patents

Dishwasher Download PDF

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Publication number
US2859755A
US2859755A US463845A US46384554A US2859755A US 2859755 A US2859755 A US 2859755A US 463845 A US463845 A US 463845A US 46384554 A US46384554 A US 46384554A US 2859755 A US2859755 A US 2859755A
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United States
Prior art keywords
vat
water
air
during
cycle
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Expired - Lifetime
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US463845A
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English (en)
Inventor
Louis L Burke
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Avco Manufacturing Corp
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Avco Manufacturing Corp
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Filing date
Publication date
Priority to BE534752D priority Critical patent/BE534752A/xx
Application filed by Avco Manufacturing Corp filed Critical Avco Manufacturing Corp
Priority to US463845A priority patent/US2859755A/en
Priority to GB36204/54A priority patent/GB768004A/en
Application granted granted Critical
Publication of US2859755A publication Critical patent/US2859755A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • A47L15/48—Drying arrangements
    • A47L15/483—Drying arrangements by using condensers
    • 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
    • A47L15/02—Washing or rinsing machines for crockery or tableware with circulation and agitation of the cleaning liquid in the cleaning chamber containing a stationary basket
    • A47L15/06—Washing or rinsing machines for crockery or tableware with circulation and agitation of the cleaning liquid in the cleaning chamber containing a stationary basket by means of an impeller in the chamber

Definitions

  • This invention relates to washing apparatus, and more particularly to improved dishwashing apparatus having novel features of construction and operation making possible the elimination of normally open vent to the atmosphere and wherein the drying portion of the cycle of operations takes place within a sealed vat provided with means for relieving pressures which may be generated therein.
  • the structure herein disclosed provides for, a sealed container with a relief valve operable to relieve excessive pressures thus eliminating the continually open vent, the relief valve being usually operable only after opening and subsequent closing of the door during the wash cycle when the hot water mixes with the cold air in the tub, the temperature rises rapidly, building up a pressure which is relieved through the pressure relief valve.
  • the relief valve being usually operable only after opening and subsequent closing of the door during the wash cycle when the hot water mixes with the cold air in the tub, the temperature rises rapidly, building up a pressure which is relieved through the pressure relief valve.
  • moisture will evaporate and condense on the walls of the tub-chamber without venting to the atmosphere with objectionable condensation. It is important that such an arrangement will give satisfactory drying results without objectionable release of steam or necessity for providing a continually open vent.
  • his a primary object of thepresent invention to proice vide a method of operation for dishwashing apparatus wherein the drying cycle takes place within a sealed vat wherein moisture is evaporated from the dishes centrally of the vat and condensed on the side walls of the vat to be later. drained from the bottom of the vat.
  • Another object of the invention is to provide in washing apparatus including a cabinet housing a vat, an improved structure and operation making possiblev the elimination of a normally open vent to. the atmosphere-
  • a further object of the invention is to provide a simplified arrangement in a washing apparatus which will be more readily adapted to built-in installation.
  • a still further object of the invention is to provide a novel construction and operation of a dishwashing apparatus which will eliminate the venting of great amounts of steam into the room wherein the machine is installed; thus, solving the moisture problem.
  • Figure 1 is a vertical sectional View taken substantially centrally through a dishwashing apparatus embodying the present invention
  • Figure 2 is a side elevation of the apparatus partly broken away, showing the general arrangement of fluid inlet structure
  • Figure 3 is an enlarged fragmentary sectional View of the upper central portion of the washing vat showing the general construction and arrangement of a pressure relief valve.
  • the type of dishwasher there shown and in which. the present invention may be applied is of the cabinet type having a coved top 10, outer cabinet. 12, and a front access door 14 hinged for opening and closing movements about its lower edge.
  • a timer control is provided at 16 to regulate the operation of the dishwasher.
  • a washing vatlS is provided within the cabinet and defines, a front access opening 20 sealed by the door 14 during the operation of the machine.
  • Water is introduced into the dishwasher by an inlet pipe 22 (Fig. 2) passing through a solenoid operated valve 24 and a delivery tube 26. Water fromthe delivery tube 26 is directed into a receiving tube 28 across an air gap 30 serving as avvacuum breaker which is normally provided in machines of this type in order to satisfy the requirements of most municipal plumbing codes. Water from the receiving tube 28 passes directly into the vat 18 through a connection 32 provided at the lower. portion thereof. It should also be noted that the receiving tube 28 is provided at a point intermediate its ends with a depending portion 34- defining a trap to hold a small amount of water thereby to maintain a sealed condition of the vat 18 with respect to the atmosphere when the door 14 is closed during operation of the machine. I
  • the water can collect in the lower portion of the vat 18 by virtue of its pan formation 36 in the lower wall.
  • the lower wall also supports a driving motor 38 having a vertically disposed shaft to which is attached an. impeller 40.
  • a heating coil 42 is provided for heating the water, if necessary, while it is being circulated, and also to heat the air within the vat 18 during the time that the dishes are being dried.
  • a solenoid operated drain valve 44 is provided to drain the water from the vat 18 at predetermined times during the complete cycle of operations, such operations being under control of the timer 16.
  • the motor 38 is de-energized and the drain valve 44 is opened to drain the wash water from the dishwasher. Since this wash water normally contains a high concentration of detergents, it is desirable to rinse the dishes with clean water after the washing operation. After rinsing, the dishes are dried by circulation of air from the impeller 40 through energization of the motor 38, the circulated air being heated by the coil 42.
  • a pair of dishracks are provided.
  • the structure and operation of the machine comprising the present invention differs primarily from the prior dishwashers in that the drying cycle takes place within a sealed vat having no normally open vent to the atmosphere for circulation of large quantities of air.
  • the only air which is circulated within the vat 18 is that which is charged into the vat 18 at atmospheric pressure when the door 14 is opened for the insertion of dishes to be treated.
  • the impeller 40 circulates and recirculates the same air over and over again through the vat 18 in a path substantially as indicated by the arrows in Figure 1.
  • the circulated air is heated by the coil 42. As the heated air passes over the dishes in the racks 46 and 48 it will pick up retained moisture therefrom and carry same into the flow stream.
  • the external surface of the vat 18 is devoid of insulation.
  • the outside of the vat has been insulated to restrict the loss of heat through the walls of the vat thereby to effect a more economical operation.
  • the heat within the vat 18 is allowed to be dissipated through the walls. It therefore follows that the walls of the vat 18 will be .cooler than the central portion thereof. As the hot moist air circulating over the dishes within the vat 18 comes into contact with the cooler walls of the vat 18, the moisture therein will condense upon the walls and drain by gravity into the lower pan formation 36.
  • This arrangement operates very much like a closed secondary refrigerant system wherein evaporation occurs at the hottest portion of the system and condensation occurs at the coolest portion. In an atmosphere of 100% humidity, moisture will evaporate from the hot surfaces and condense on the cooler surfaces. Since the vat 18 is not provided with the customary vent to the atmosphere as hereinbefore discussed, the only heat loss from the vat will be through the walls thereof which are at a lower temperature than the dishes and, of course, the absence of insulation on the vat walls will facilitate the flow of heat therethrough.
  • a pressure relief valve 50 located at the top of and centrally of the vat 18.
  • the construction of the relief valve 50 is best shown in Figure 3.
  • the relief valve 50 is constructed of rubber or other suitable resilient material and is made in two pieces.
  • the lower member 52 of the valve 50 is generally thin and annular in form and is made with a flanged rim 54 adapted to fit securely into an opening in the top of the vat 18.
  • the upper member 56 of the valve 50 is generally circular in form having an outside diameter equal to the outside diameter of member 52.
  • Members 52 and 56 are bonded together by cementing, or in any other suitable manner, at spaced points near the largest diameters thereof to provide a unitary structure.
  • the construction is such as to provide spaced points about the periphery thereof for the escape of air under pressure from within the vat 18.
  • the air pressure within the vat 18 reaches a certain predetermined amount the upper member 56 of the valve 50 will be urged upwardly at its centermost portion and the air will force its way between the members 52 and 56 finding an exit at spaced points between the bonded areas of the two members.
  • the valve members 52 and 56 due to the resilient nature thereof will return to their normal unstressed condition providing a seal for the vat 18.
  • the valve members 52 and 56 are normally biased together in such a manner as to maintain a certain amount of pressure within the vat 18. Such pressure, however, must be less than what would be required to force the water from the trap 34 in the water inlet line.
  • a dishwashing and dish drying apparatus comprising, in combination, a closed vat having uninsulated side walls, dish-receiving racks disposed within said vat for supporting dishes to be washed and dried, an access opening for said vat,.a door sealing said opening, fluid circulating means Within said vat for circulating water during the washing cycle and air during the drying cycle, a heating element disposed within said vat for heating water and air during the time when each such fluid is circulated, a drain at the bottom of the vat for draining water from said vat, and means for sealing said vat during the drying cycle whereby the same air circulated by said fluid circulating means is recirculated to pick up moisture from the wet dishes and condense the same on the relatively cooler interior uninsulated walls of the vat and the condensed moisture drains by gravity into said drain opening.
  • An apparatus including a pressure relief valve in said vat operable only on the opening or closing of said door during the wash cycle to relieve the air pressure within the vat caused by the initial mixing of hot water with cold air in the vat.
  • a dishwashing apparatus comprising, in combination, a vat closed to the outer atmosphere, said vat having side walls in direct contact with the outside atmosphere, dish-receiving racks disposed within said vat for supporting dishes to be Washed and dried, an access opening for said vat, a door sealing said 1 opening, fluid circulating means within said vat for circulating Water during the washing cycle and air during the drying cycle, a heating element disposed within said vat for heating water and air during the time when each such fluid is circulated, a drain at the bottom of the vat for draining water from said vat, and means for sealing said vat whereby the same air circulated by said fluid circulating means during the drying cycle is recirculated to pick up moisture from the wet dishes and condense the same on the relatively cooler interior uninsulated Walls of the vat and the condensed moisture drains by gravity into said drain opening.

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  • Washing And Drying Of Tableware (AREA)
US463845A 1954-10-22 1954-10-22 Dishwasher Expired - Lifetime US2859755A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
BE534752D BE534752A (cs) 1954-10-22
US463845A US2859755A (en) 1954-10-22 1954-10-22 Dishwasher
GB36204/54A GB768004A (en) 1954-10-22 1954-12-14 Improvements in or relating to dishwashers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US463845A US2859755A (en) 1954-10-22 1954-10-22 Dishwasher

Publications (1)

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US2859755A true US2859755A (en) 1958-11-11

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US463845A Expired - Lifetime US2859755A (en) 1954-10-22 1954-10-22 Dishwasher

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BE (1) BE534752A (cs)
GB (1) GB768004A (cs)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3026628A (en) * 1956-08-07 1962-03-27 Whirlpool Co Drying system for dishwashers
US3050866A (en) * 1960-06-13 1962-08-28 Gen Electric Dishwasher with drying means
US3068877A (en) * 1958-09-12 1962-12-18 Gen Motors Corp Dishwasher
DE1255254B (de) * 1963-01-31 1967-11-30 Siemens Elektrogeraete Gmbh Einrichtung bei Geschirrspuelmaschinen
US20210267432A1 (en) * 2020-02-27 2021-09-02 Ravinder Fotedar Steam Cleaning Apparatus
US20230212312A1 (en) * 2015-06-24 2023-07-06 Hoffmann-La Roche Inc. Trispecific antibodies specific for her2 and a blood brain barrier receptor and methods of use

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US223649A (en) * 1880-01-20 Itnesses
US1564783A (en) * 1921-05-06 1925-12-08 Ind Dryer Corp Method of and apparatus for drying including solvent recovery
US2390757A (en) * 1938-10-22 1945-12-11 Mabel A Voris Dishwashing machine
US2422022A (en) * 1942-01-15 1947-06-10 Hotpoint Inc Dishwashing and drying apparatus
GB641226A (en) * 1946-12-16 1950-08-09 Alfred Davies An improved drying cabinet
US2663950A (en) * 1949-01-15 1953-12-29 Detrex Corp Solvent saver recovery apparatus
US2676418A (en) * 1951-02-27 1954-04-27 Gen Motors Corp Dehumidifier and drier
US2698626A (en) * 1952-10-18 1955-01-04 Hugh M Rumbaugh Dishwasher
US2706347A (en) * 1951-02-28 1955-04-19 Eisenman Eugen Device for drying loosely piled goods, especially piled wood

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US223649A (en) * 1880-01-20 Itnesses
US1564783A (en) * 1921-05-06 1925-12-08 Ind Dryer Corp Method of and apparatus for drying including solvent recovery
US2390757A (en) * 1938-10-22 1945-12-11 Mabel A Voris Dishwashing machine
US2422022A (en) * 1942-01-15 1947-06-10 Hotpoint Inc Dishwashing and drying apparatus
GB641226A (en) * 1946-12-16 1950-08-09 Alfred Davies An improved drying cabinet
US2663950A (en) * 1949-01-15 1953-12-29 Detrex Corp Solvent saver recovery apparatus
US2676418A (en) * 1951-02-27 1954-04-27 Gen Motors Corp Dehumidifier and drier
US2706347A (en) * 1951-02-28 1955-04-19 Eisenman Eugen Device for drying loosely piled goods, especially piled wood
US2698626A (en) * 1952-10-18 1955-01-04 Hugh M Rumbaugh Dishwasher

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3026628A (en) * 1956-08-07 1962-03-27 Whirlpool Co Drying system for dishwashers
US3068877A (en) * 1958-09-12 1962-12-18 Gen Motors Corp Dishwasher
US3050866A (en) * 1960-06-13 1962-08-28 Gen Electric Dishwasher with drying means
DE1255254B (de) * 1963-01-31 1967-11-30 Siemens Elektrogeraete Gmbh Einrichtung bei Geschirrspuelmaschinen
US20230212312A1 (en) * 2015-06-24 2023-07-06 Hoffmann-La Roche Inc. Trispecific antibodies specific for her2 and a blood brain barrier receptor and methods of use
US20210267432A1 (en) * 2020-02-27 2021-09-02 Ravinder Fotedar Steam Cleaning Apparatus

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Publication number Publication date
BE534752A (cs)
GB768004A (en) 1957-02-13

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