Dishwashing Machine Patents (Class 134/58D)
  • Patent number: 6138692
    Abstract: A method for operating an automatic dishwasher in a manner to minimize the deposition of contaminants or filming on the dishes is provided. The present invention contemplates that objectionable filming on washed dishes or dishware items may occur if residual water left on the dishes at the end of the final drain step is not given a chance to drip off or drain from the dishware. The present invention provides for a drip period following the final drain step in the dishwashing cycle. The drip period provides an opportunity for gravity assisted draining or "drip-off" of residual water from the dishware items prior to evaporation such that the minute particles which are suspended in the residual water are not deposited onto the dishes. During the drip period, rapid evaporation of residual liquid from the dishware items is prevented.
    Type: Grant
    Filed: January 22, 1999
    Date of Patent: October 31, 2000
    Assignee: Whirlpool Corporation
    Inventors: Duane M. Kobos, Kenneth N. Whah, Tony L. Ellis, Ernst Grunewald, Ralph E. Christman
  • Patent number: 6053185
    Abstract: A dishwasher having a drying mode with jet-air injection comprising a washing chamber refined by a back wall, a top wall, a bottom floor, a first and second side walls and a dishwasher door; and, a jet-air injection system which injects during the drying mode to a plurality evenly distributed forceful streams of jet-air from an air manifold coupled to the top wall of the washing chamber. The air manifold comprises a plurality of parallelly spaced conduits, perpendicular to the back wall, each of which has formed therein a plurality of spaced air vents which expel downward therefrom the plurality of evenly distributed forceful streams of jet-air. The force of the plurality evenly distributed forceful streams of jet-air forces buildup of water collected in an indentation, cracks and crevices of upside down glasses, cups, and other dishes place in a top rack of the washing chamber out of she indentation, cracks and crevices and downward to the bottom floor of the washing chamber.
    Type: Grant
    Filed: December 22, 1997
    Date of Patent: April 25, 2000
    Inventor: Jerry P. Beevers
  • Patent number: 6007640
    Abstract: The dishwasher of the present invention is adapted to skip a drain cycle if the water in the dishwasher is clean enough. The invention uses a turbidity sensor to sense the turbidity of the water. If the sensed turbidity is below a threshold value, the drain motor and the water valve are disabled to prevent the water from being drained and to prevent additional water from being introduced into the dishwasher.
    Type: Grant
    Filed: October 27, 1998
    Date of Patent: December 28, 1999
    Assignee: Maytag Corporation
    Inventors: Mark B. Neff, Thomas M. Johnson
  • Patent number: 5992954
    Abstract: A dishwashing machine with a supporting structure is provided and is constructed from horizontal and vertical frame members. The supporting structure forms at least a front and a rear supporting frame which support a rinsing container. The parts and assembly costs for the dishwashing machine can be considerably reduced in that the supporting frames are assembled from individual horizontal frame members and vertical frame members, the respectively abutting areas of a horizontal and a vertical frame member being provided with locking and counter-locking elements which are adapted to one another. The rinsing container is provided with integral grooves for the positive positioning of the supporting structure on the rinsing container.
    Type: Grant
    Filed: August 21, 1998
    Date of Patent: November 30, 1999
    Assignee: Whirlpool Corporation
    Inventor: Ronald Becker
  • Patent number: 5983908
    Abstract: A glass washing and dishwashing machine including an improved oscillating spray mechanism, an improved tank valve/water diversion mechanism, and an improved water tank assembly, which are all incorporated into the glass washing and dishwashing machine. The oscillating spray mechanism directs a spray of wash water or rinse water at glasses, dishes or the like and oscillates the spray mechanism in order to more completely contact glasses or the like with wash water during a washing and rinsing operation. The tank valve mechanism selectively supplies wash water or rinse water from the tank assembly to the spray mechanism. The valve/water diversion mechanism is interconnected with two water reservoir chambers for delivering wash or rinse water to a washing station.
    Type: Grant
    Filed: June 10, 1998
    Date of Patent: November 16, 1999
    Inventor: Carl L. Bradley
  • Patent number: 5957144
    Abstract: The dishwasher of the present invention is adapted to skip a drain cycle if the water in the dishwasher is clean enough. The invention uses a turbidity sensor to sense the turbidity of the water. If the sensed turbidity is below a threshold value, the drain motor and the water valve are disabled to prevent the water from being drained and to prevent additional water from being introduced into the dishwasher.
    Type: Grant
    Filed: May 18, 1998
    Date of Patent: September 28, 1999
    Assignee: Maytag Corporation
    Inventors: Mark B. Neff, Thomas M. Johnson
  • Patent number: 5923432
    Abstract: A cleaning efficacy indicator system (20) includes a light source (50) and a light receiver (56). A light-transmitting optical indicator element (30) receives light from the source (50) and transmits the light to the receiver (56). The receiver (56) provides at an electrical output signal (82) which varies in accordance with light received from the light source (50). The light-transmitting optical indicator element (30) is purposefully soiled on its outer surface (48) with a soiling agent to inhibit or alter its light transmitting abilities. However, upon effective washing, the indicator element (30) is able to transmit an increased light intensity. The indicator element (30) is washed with a load of soiled articles. Either during washing operations or subsequently, the light transmission through the indicator element (30) is monitored using the light output signal (82) of the light receiver (56). A select change in light transmission is indicative of effective washing operations.
    Type: Grant
    Filed: December 18, 1997
    Date of Patent: July 13, 1999
    Assignee: Steris Corporation
    Inventor: Jude A. Kral
  • Patent number: 5904163
    Abstract: A dishwasher includes a cabinet having an opening, a door provided to open/close the cabinet opening, a washing chamber member provided in the cabinet and forming a washing chamber facing the opening, a washing nozzle provided facing in a certain direction of the washing chamber, a circulation pump coupled to the washing nozzle, the bottom portion of washing chamber and an external drain outlet, a driving source provided outside the washing chamber, a power transmission mechanism provided at a corner on one side in cabinet behind and outside the washing chamber, and a control circuit controlling the circulation pump and driving source. By the power transmitting mechanism, a dish washing basket placed in the washing chamber is rotated. Since the power transmitting mechanism is placed in a corner behind the washing chamber, the dishwasher can be made smaller.
    Type: Grant
    Filed: July 25, 1997
    Date of Patent: May 18, 1999
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Yoshifumi Inoue, Yasuhiro Sakoda, Hirokazu Nishio, Kenji Kimura, Eijirou Iguchi, Takeshi Tanabe, Tetsuichi Arita, Mituo Oouchi
  • Patent number: 5887602
    Abstract: A cleaning machine comprises a loader section for transferring a to-be-processed object, an unloader section for transferring a processed object, a chemical liquid bath for cleaning the to-be-processed object with chemical liquid, a plurality of cleaning units, sequentially arrayed at a lower stream of the chemical liquid bath in a direction from the loader section to the unloader section, having a water cleaning bath for cleaning the to-be-processed object with pure water, a plurality of transfer machines for transferring the to-be-processed object between the loader section and the cleaning unit adjacent to the loader section, between the adjacent cleaning units, and between the unloader section and the cleaning unit adjacent to the unloader section, sequentially, a plurality of sensors, provided in the chemical liquid bath and the cleaning units, for detecting a chemical liquid state and a cleaning operation state, and control means for executing a process for measurement against abnormality in response to
    Type: Grant
    Filed: July 24, 1996
    Date of Patent: March 30, 1999
    Assignee: Tokyo Electron Limited
    Inventor: Tatsuyuki Iwama
  • Patent number: 5881746
    Abstract: The invention relates to a method and to a device for carrying out the method for drying crockery in a dishwasher with a rinse container closeable by means of a door. By means of two or three successive different method steps, the drying is improved. The method steps include a drainage phase, a drying phase with blower or condenser and an automatic, partial opening of the door.
    Type: Grant
    Filed: October 24, 1995
    Date of Patent: March 16, 1999
    Assignee: Whirlpool Europe B.V.
    Inventors: Josef Buser, Ingrid John, Christa Maurer, Ralf Wilhelmstatter, Peter Schwarzweller
  • Patent number: 5878603
    Abstract: A quiet fill water system for a washing machine comprises a washing tub having an outer wall and an entry port disposed within the outer wall and a valve having a water inlet and a water outlet. A water reservoir is coupled to the outer wall, the water reservoir having a tube entry port, a cup-shaped bottom portion and a water outlet wherein the water outlet is mated with the outer wall entry port so as to provide fluid communication between the water reservoir and the washing tub. A capillary tube having a first end, a second end and a tip portion is disposed such that the first end is coupled to the water outlet of the valve and the second end is positioned within the tube entry port so that the tip portion is disposed within the cup-portion of the water reservoir at a lower position relative to the water outlet such that a quiescent reservoir of water is formed during a fill period so as to decrease the level of noise of the fill period.
    Type: Grant
    Filed: March 19, 1998
    Date of Patent: March 9, 1999
    Assignee: General Electric Company
    Inventors: Richard Edwin Warren, Jr., Robert Arvin Heeden, Dennis Steenburgh
  • Patent number: 5860436
    Abstract: A washer having a pair of offset legs. In addition to the offset legs, the washer includes a tub, a front frame and a rear frame. The tub defines a wash chamber with a front opening and includes a bottom wall and opposing side walls. The front frame has a pair of legs respectively disposed adjacent to the opposing side walls of the tub toward the front opening. The rear frame has a pair of horizontal legs with outer ends and a pair of vertical supports. The vertical supports are disposed rearward from the legs of the front frame. The horizontal legs are secured to the vertical supports and extend forward therefrom to the outer ends. The offset legs each have a neck and an upright member. The necks are offset forward of the upright members and are respectively secured to the legs of the front frame. The upright members are respectively secured to the horizontal legs toward the outer ends.
    Type: Grant
    Filed: July 31, 1996
    Date of Patent: January 19, 1999
    Assignee: White Consolidated Industries, Inc.
    Inventor: Bradley B. Hobday
  • Patent number: 5858116
    Abstract: A bowl cleansing device and a fruit and vegetable cleansing method using the same are provided. The bowl cleansing device comprising: a cabinet for forming a cleansing room; a cleansing basket installed inside the cleansing room, for loading therein articles to be cleansed; a spray nozzle for spraying the cleansing water to the articles loaded in the cleansing basket; a pump for supplying the cleansing water to the spray nozzle; a heater for heating the cleansing water; a mode selector for selecting one of a plurality of modes including a bowl cleansing mode and a fruit and vegetable cleansing mode; and a controller for controlling the heater so that the cleansing water has a temperature suitable for the cleansing mode selected through the mode selector.
    Type: Grant
    Filed: November 19, 1997
    Date of Patent: January 12, 1999
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Sinyong Kim
  • Patent number: 5839454
    Abstract: The instant invention is an automatic detergent dispenser for residential dishwashers allowing transfer of liquid from a store purchased container or an integrated storage receptacle. The invention allows an individual to determine the amount of detergent to be transferred with provisions to operate the detergent transfer only upon demand preventing operation of the dishwasher if an insufficient amount of detergent is available. An alternative embodiment allows positioning of a storage container beneath the dishwasher chamber with provisions to fill the container.
    Type: Grant
    Filed: March 14, 1997
    Date of Patent: November 24, 1998
    Inventor: Warren W. Matz
  • Patent number: 5836324
    Abstract: The present invention relates to a vent seal device for an automatic dishwasher. The dishwasher includes a door having a vent opening therein. An elongated flexible strip is mounted in the door adjacent and generally registered with the vent opening. The strip has opposite ends and a central portion therebetween. At least one end of the strip is secured against movement with respect to the frame. During certain times of the wash and rinse cycles the strip is deflected into sealing engagement with the vent opening, thereby closing the normally open vent opening.
    Type: Grant
    Filed: July 21, 1997
    Date of Patent: November 17, 1998
    Assignee: Maytag Corporation
    Inventors: Thomas M. Johnson, Brian L. Ness
  • Patent number: 5829459
    Abstract: A dishwashing machine having a reservoir (6) communicating with the washing tank (1) through a lower aperture (7) connected to the delivery side of a drain pump (3). The reservoir (6) comprises an upper aperture (9) capable of communicating with the outside ambient through a valve (10) which is controlled by the program sequence control switch (13) of the machine so as to open during a pre-determined water discharge phase to enable the reservoir (6) to be filled by the water being let out from the tank (1); to temporarily close so as to prevent said reservoir (6) from emptying after said water discharge phase; and to finally open again so as to enable the water stored in the reservoir (6) to flow back into the washing tank (1), through the lower aperture (7) and the pump (3), to be used during said subsequent phase of the washing process.
    Type: Grant
    Filed: March 10, 1997
    Date of Patent: November 3, 1998
    Assignee: Electrolux Zanussi Elettrodomestici S.p.A.
    Inventors: Claudio Milocco, Gianluca Tassotti, Giovanni Centis
  • Patent number: 5806541
    Abstract: An automatic dishwashing machine includes enhanced drying and draining cycles. Toward the end of the rinse and hold cycle when the water is draining, a second quantity of water is added to the machine resulting in a purging action which reduces the concentration of soil in the wash pump. During the normal wash cycle, if the dishwashing machine determines that the water is sufficiently dirty, a second drain is initiated to remove any dirty water that is present in the bottom of the pump after the first drain. During the dry cycle, the machine senses the temperature of the water and the presence of a rinse aid to select an appropriate dry cycle. The possible dry cycles include a delayed dry cycle and a pulsed dry cycle.
    Type: Grant
    Filed: May 9, 1997
    Date of Patent: September 15, 1998
    Assignee: Maytag Corporation
    Inventors: Randall L. Cooper, Mitchell N. Corbett, Mark A. Cracraft
  • Patent number: 5800628
    Abstract: A method for washing objects automatically provides the taking of turbidity measurements before and after a portion of water is removed from the dishwasher. This partial drain allows first and second magnitudes of turbidity characteristics, taken before and after the partial drain, to be compared to each other for an analysis of the degree and/or character of particulates within the water of a dishwasher. In certain applications of this method, the turbidity characteristics can be the absolute magnitude of turbidity, the rate of change of turbidity, the absolute magnitude of turbidity variability and the rate of change of the absolute magnitude of turbidity variability. The portion of water removed between the two sets of readings that yield the first and second magnitudes of the selected characteristics is less than the total amount of water within the dishwasher.
    Type: Grant
    Filed: October 22, 1996
    Date of Patent: September 1, 1998
    Assignee: Honeywell Inc.
    Inventors: Timothy K. Erickson, Gary R. O'Brien
  • Patent number: 5797409
    Abstract: An automatic dishwashing machine includes enhanced drying and draining cycles. Toward the end of the rinse and hold cycle when the water is draining, a second quantity of water is added to the machine resulting in a purging action which reduces the concentration of soil in the wash pump. During the normal wash cycle, if the dishwashing machine determines that the water is sufficiently dirty, a second drain is initiated to remove any dirty water that is present in the bottom of the pump after the first drain. During the dry cycle, the machine senses the temperature of the water and the presence of a rinse aid to select an appropriate dry cycle. The possible dry cycles include a delayed dry cycle and a pulsed dry cycle.
    Type: Grant
    Filed: May 9, 1997
    Date of Patent: August 25, 1998
    Assignee: Maytag Corporation
    Inventors: Randall L. Cooper, Mitchell N. Corbett, Mark A. Cracraft
  • Patent number: 5792276
    Abstract: A dishwasher controlling apparatus and method in which account is taken of the temperature of the supply water which is input to the dishwasher for washing and/or rinsing purposes. Washing/rinsing of articles commences at the time water is supplied to the dishwasher, and the time taken for the water to be heated to a certain temperature is measured to determine the effectiveness of the washing/rinsing while the water is heated. Accordingly, the washing/rinsing duration which takes place when the water reaches a desired washing/rinsing temperature can be shortened without reducing washing/rinsing effectiveness, resulting in a time efficient washing and/or rinsing cycle.
    Type: Grant
    Filed: July 17, 1995
    Date of Patent: August 11, 1998
    Assignee: Southcorp Manufacturing Pty. Ltd.
    Inventor: Leo Peter Driessen
  • Patent number: 5771909
    Abstract: A program controlled dishwasher in which magnetic sensors provided adjacent to the dishwasher door respond to magnetic fields of predetermined polarization provided by permanent magnets in a catenulate magnetic key mounted on a dishwasher caddy in a position adjacent the magnetic sensors when the caddy is in the tub of the dishwasher, for generating a verifiable code pattern readable against dishwasher stored programs for the selection and actuation of a program specific to the articles which are stored in the caddy for washing. The polarization patterns on the caddies are specific to the kind of articles stored therein and may be readily altered to accommodate different articles.
    Type: Grant
    Filed: April 22, 1996
    Date of Patent: June 30, 1998
    Assignee: Carl Miele & Cie. GmbH & Co.
    Inventors: Wolfgang Hein, Ulrich Hettenhausen, Frank Kethers, Peter Obermeier
  • Patent number: 5762080
    Abstract: A washer for washing objects with liquid. The washer includes a wash chamber adapted for holding objects to be washed. The sump has a pump chamber and a collection chamber, both of which are adapted to hold liquid from the wash chamber. A recirculation pump is operable to move liquid from the pump chamber to the wash chamber. A drain pump is operable to move liquid from the pump chamber and the collection chamber to a drain. A rotatable blade is disposed in the collection chamber and is adapted to mince particles therein. A controller is provided for controlling the operation of the recirculation pump and the drain pump. The controller is operable to turn the drain pump on and off during a wash phase in order to move particles from the collection chamber to the drain. The controller is also operable to turn the drain pump on at the end of the wash phase in order to initiate a drain phase wherein the drain pump drains the sump of liquid.
    Type: Grant
    Filed: January 24, 1997
    Date of Patent: June 9, 1998
    Assignee: White Consolidated Industries, Inc.
    Inventors: James M. Edwards, John E. Dries
  • Patent number: 5760493
    Abstract: The invention is a dishwasher and a control therefore in which the control comprises multiple parallel loads, including a motor. The motor and the other loads are connected to one side of a power source by a motor relay, which is controlled by a processor. All the loads, except the motor, are connected to the other side of a power source by semiconductor switches with each load having a corresponding switch. The motor has an unswitched connection to the other side of the power source. The power to all the loads, including the motor, is controlled by the motor relay. If one of the switches fails in such a way that the circuit for one of the loads is closed, then the load will be shut off when the motor relay is opened to shut off power to the motor. Thus, it is possible to prevent the failed load circuit from operating during the entire wash cycle.
    Type: Grant
    Filed: November 18, 1996
    Date of Patent: June 2, 1998
    Assignee: Whirlpool Corporation
    Inventors: Alan G. Outcalt, David W. Mundy, Robert H. Ashton, Ryan K. Roth, Theodore F. Meyers
  • Patent number: 5755244
    Abstract: A dishwasher having spray arm, motor and pump components configured and mounted so as to occupy very low height. In one form the complete wash system is arranged as a drawer which slides in and out of a cabinet. The cabinet opening is stiffened against racking forces by incorporating an inverse portal frame in the opening flange. A synchronous AC motor is used with the rotor running within the wash chamber driving a wash pump integrated with a rotating spray arm.
    Type: Grant
    Filed: January 29, 1997
    Date of Patent: May 26, 1998
    Assignee: Fisher & Paykel Limited
    Inventors: Adrian Anthony Sargeant, William Hugh Currie, Willem Ouwens, Philip John Brace, Robert William Todd, Hans-Joachim Scholz
  • Patent number: 5660195
    Abstract: A passive or dynamic venting system for a frontloading dishwasher is located within the dishwasher door and includes a plate-shaped valve which closes off a valve port in the inner liner or face of the door; the valve is moved by a linear actuator along a path of closing and opening that is perpendicular to the plane of the door. In the dynamic system, a cross-flow type blower is also located within the door.
    Type: Grant
    Filed: March 5, 1996
    Date of Patent: August 26, 1997
    Assignee: White Consolidated Industries, Inc.
    Inventors: Marion Lee Taylor, Jr., Lars Rosengren
  • Patent number: 5660193
    Abstract: The invention relates to a waste water heat recovering unit for preheating cold fresh water with already heated water, comprising a cleaning liquid tank (9) for collecting warm cleaning liquid, an intermediate tank (10) which is connected via a pipe (101) with the cleaning liquid tank (9), a pump (8) arranged in the pipe (101) which conveys at least part of the warm cleaning liquid from the cleaning liquid tank (9) into the intermediate tank (10), and a heat exchanger (4) which is connected, on the one hand, via a fresh water pipe (14) equipped with a volume controlling valve (1) to a fresh water connection for cold water and, on the other hand, to the intermediate tank (10) containing the warm cleaning liquid, a drain valve (12) being provided at the outlet of the heat exchanger (4) in the cleaning liquid guidance so that there flows through the heat exchanger (4) either substantially the same volume of cold fresh water as warm cleaning liquid from the intermediate tank (10), or only warm cleaning liquid wit
    Type: Grant
    Filed: June 21, 1995
    Date of Patent: August 26, 1997
    Assignee: Premark FEG L.L.C.
    Inventors: John Archer, Markus Worter
  • Patent number: 5642742
    Abstract: The invention includes a warewasher comprising a wash chamber, a tank at the bottom of said chamber for supplying recirculated heated water through a pump to wash arms in said chamber, a primary water heating system comprising a heat exchange tube entering said tank through a first port or inlet in said tank, traversing the base of the tank, and exiting said tank through a second port or outlet, said tube being at a height in said tank such that the tube is submerged when said tank is filled with water, said tube having a first end and a second end located outside of the tank and providing a passageway between the ends, a gas-fired infrared burner located in said tube adjacent said first end to which an air/gas mixture is supplied and combusted by said burner, at least one secondary labyrinthine heat exchanger in intimate heat transfer relationship with at least one of the walls of said tank below the water level, and controls for automatically operating the heating system in response to a need to increase th
    Type: Grant
    Filed: February 28, 1996
    Date of Patent: July 1, 1997
    Assignee: The Stero Company
    Inventors: Lars Noren, Doug Noren
  • Patent number: 5617885
    Abstract: A dishwashing machine having a wash tank (1) arranged to be supplied with fresh supply water through an appropriate water supply circuit (8-14). The machine is adapted to perform operational cycles including a washing phase and at least one rinsing phase. A water recovery system (14, 15) is provided to store in a reservoir (11) water from the last rinse for re-using during a subsequent washing cycle. The reservoir (11) is a part of the water supply circuit (8-14) so that the reservoir is capable of being flushed by the fresh water delivered into the tank (1,4) when the supply circuit is opened.
    Type: Grant
    Filed: February 21, 1995
    Date of Patent: April 8, 1997
    Assignee: Electrolux Zanussi Elettrodomestici S.p.A.
    Inventor: Giovanni Centis
  • Patent number: 5609172
    Abstract: An improved washing water filtering apparatus for a dish washing machine capable of preventing nets of a washing water filter from being clogged by wastes, so that it is not necessary to clean the nets of a washing water filter after using the dish washing machine, and preventing water pollution by effectively filtering the washing water of the dish washing machine, which includes a waste gathering box having a drain opening formed at an inner wall thereof and connected to a drainpipe and having an introduction tube disposed at a lower inner wall thereof for receiving washing water and wastes, such as food debris; a driving motor disposed at a lower portion of the waste gathering box; a rotary shaft connected to an upper portion of the driving motor and partially inserted into the interior of the waste gathering box and having an upper impeller disposed at an upper portion thereof; a lower impeller disposed at a lower portion of the waste gathering box and spaced apart from the upper impeller and connected to
    Type: Grant
    Filed: December 28, 1995
    Date of Patent: March 11, 1997
    Assignee: LG Electronics Inc.
    Inventors: Jae W. Chang, Joon W. Kim
  • Patent number: 5603431
    Abstract: A control mechanism for dispensing fluent materials includes a linkage mechanism actuatable by a single drive member to cause release of a first fluent material from a first dispenser when the drive member is initially moved. The linkage mechanism causes the release of a second fluent material from a second dispenser when the drive member is moved a second time.
    Type: Grant
    Filed: April 14, 1995
    Date of Patent: February 18, 1997
    Assignee: Maytag Corporation
    Inventor: Barry E. Tuller
  • Patent number: 5556478
    Abstract: An apparatus and method for programming a detergent controller to vary the detergent concentration set-point according to the time of day and to achieve detergent concentration levels quickly without incurring overshoot. Thus, the present invention insures that the warewashing machine is operated at optimum efficiency and cost. To vary the set-point according to the time of day, the invention combines the features of a microprocessor, a clock and a controller into one unit. The user enters the time setting and set point into the controller. The microprocessor then compares the real-time clock signal with the user time settings and outputs an appropriate set-point value from the microprocessor to the controller.
    Type: Grant
    Filed: January 12, 1995
    Date of Patent: September 17, 1996
    Assignee: Ecolab Inc.
    Inventors: Daniel F. Brady, John E. McCall, Jr., Clyde A. Bailey, James L. Copeland
  • Patent number: 5555583
    Abstract: A dynamic temperature compensation method for a turbidity sensor in an appliance for washing articles is provided. The method includes the steps of: retaining substantially particle-free liquid upon completion of cleansing operations in the appliance, reading initial values of temperature and turbidity of the liquid, measuring additional values of temperature and turbidity of the liquid at predetermined time intervals, and calculating a temperature coefficient, based upon respective ones of the initial and the additional values of temperature and turbidity, for characterizing a temperature response of the turbidity sensor over a predetermined temperature range.
    Type: Grant
    Filed: February 10, 1995
    Date of Patent: September 17, 1996
    Assignee: General Electric Company
    Inventor: Ertugrul Berkcan
  • Patent number: 5515876
    Abstract: A torsion bar assembly for a dishwasher door having a stainless steel torsion bar enclosed in an elongated stainless steel tube such that the bar rotates within the tube as the door is moved between an open and a closed position. One end of the bar and tube are fixedly disposed in a rectangular boss which is fixedly attached to the dishwasher door; and a second end of the tube and bar are releasably disposed in a cylindrical boss which is welded to a door hinge. The bosses are attached on opposite sides of the interior door panel, so that the torsion bar extends substantially the width of the door. The torsion bar is protected from water by the corrosion-resistant tube, and by a pair of quad-rings which are disposed in recesses in the cylindrical boss. The quad-rings prevent water from seeping through the boss and reaching the torsion bar. When the ends of the torsion bar are disposed in the bosses, the bar is spaced within the tube to permit the bar to rotate independently of the tube.
    Type: Grant
    Filed: April 21, 1994
    Date of Patent: May 14, 1996
    Assignee: Premark FEG Corporation
    Inventors: Charles E. Warner, Ronald D. Schaefer, Donald H. Blackburn, Darryl W. Bernard, Charles L. Logan
  • Patent number: 5500050
    Abstract: A detergent dispenser controller for use with a washing device, such as a dishwasher, that measures detergent concentration in a water tank by measuring the conductivity of the detergent solution in the water tank. The detergent controller automatically learns the feed rate of the detergent dispenser used, regardless of the type of detergent dispenser being used. For each detergent feed cycle, the controller computes a Feed Factor equal to the amount of detergent feed on time required for each unit increase in the detergent concentration, which is the inverse of the detergent feed rate. The controller stores the computed Feed Factor for the last N feed cycles in a non-volatile memory, and computes a running average of the N feed factors stored in the non-volatile memory. Whenever the detergent dispenser is powered on, it determines the difference between the measured wash tank detergent concentration and a specified detergent concentration set point value.
    Type: Grant
    Filed: July 15, 1994
    Date of Patent: March 19, 1996
    Assignee: Diversey Corporation
    Inventors: Wai Y. C. Chan, James W. Livingston
  • Patent number: 5494062
    Abstract: A dishwasher is provided with a valve for alternating flow to upper and lower spray arms during washing. The valve is controlled by periodic interruption of the pump for certain lengths of time. An electromechanical timer has a main cam wheel and an auxiliary cam wheel. The main cam wheel controls the pump and other parts of the dishwasher. The auxiliary cam wheel overrides the main cam wheel control of the dishwasher to provide the periodic lobes.
    Type: Grant
    Filed: February 3, 1995
    Date of Patent: February 27, 1996
    Assignee: White Consolidated Industries, Inc.
    Inventor: Phillip J. Springer
  • Patent number: 5462606
    Abstract: In a commercial dishwashing machine the temperature of the final hot fresh rinsing water is sensed and sanitizer is injected into the rinsing water in a predetermined amount when the temperature of the hot rinsing water is sensed to be below a predetermined threshold minimum. The temperature sensing is accomplished with an electrical sensing device. The electrical temperature sensing device energizes the sanitizer for injection of sanitizer into the rinse water preferably within a predetermined temperature range of the hot rinsing water defined at a bottom limit by a threshold minimum and at an upper limit by a threshold maximum temperature.
    Type: Grant
    Filed: April 22, 1994
    Date of Patent: October 31, 1995
    Inventor: John R. Burns
  • Patent number: 5448115
    Abstract: Improved timing circuits (205), charge dispensing circuits (213,215), and methods and systems (100) for operation of warewashing equipment. According to one aspect of the invention the system operates on both door and conveyor types of machines. The system dispenses both an initial charge amount and a dose amount during normal operations. In door types of systems, only a single power/signal connection (109) needs to be made to the dispensing system; in one embodiment the warewash rinse power connection. Further, the system can dispense detergent at an interval of greater than once per cycle or operation.
    Type: Grant
    Filed: August 12, 1992
    Date of Patent: September 5, 1995
    Assignee: Nova Controls
    Inventors: David R. Howland, Francis Turner
  • Patent number: 5429146
    Abstract: A dishwasher equipped for single-phase alternating current connection, in particular a dishwasher for typical designated use in a household, includes a recirculating pump for wash water and rinse water with which items to be cleaned are acted upon under a spray pressure. A three-phase rotary current motor drives the recirculating pump. An electronically controlled single-phase AC/three-phase rotary current/frequency inverter impresses current on the three-phase rotary current motor.
    Type: Grant
    Filed: August 16, 1993
    Date of Patent: July 4, 1995
    Assignee: Bosch-Siemens Hausgeraete GmbH
    Inventors: Richard Graf, Uwe Kampet, Bernd-Peter Herrmann
  • Patent number: 5409023
    Abstract: In order to complete a water fill phase, an electromagnetically actuated water fill valve (11) enables water from a supply source to flow into a dishwasher tank, this water being at the same time taken in by a circulation pump (3). Both the valve and the pump are controlled by a timer switch arranged to be energized from a power supply source (4, 5) through a normally open pressure-responsive switch (14) that is arranged to close when the pressure at the delivery side of said circulation pump (3) rises beyond a pre-determined value (P2). At the beginning of the water fill phase, the valve (11) is opened by the timer switch until the latter has been energized for a pre-determined total period of time (T) where T equals the summation of times T1-T6.
    Type: Grant
    Filed: October 14, 1993
    Date of Patent: April 25, 1995
    Inventors: Gianni Santarossa, Claudio Milocco
  • Patent number: 5365969
    Abstract: An improved float to prevent over-filling of a dishwashing machine including a cylindrical main float body, a skirt attached to the main float body and extending outwardly and downwardly therefrom, and a float stem. The main float body includes a lower portion which extends downwardly beyond a lower terminal portion of the skirt, and serves as a suds stop to prevent suds created during operation of the dishwasher from rising up within the hollow interior of the main float body and flowing down a stand pipe upon which the float is mounted. The lower portion of the main float body includes a slotted opening which serves as a vacuum breaker to prevent a vacuum from being created within the main float body which would cause the float to adhere to bottom wall of the dishwasher tub.
    Type: Grant
    Filed: January 21, 1994
    Date of Patent: November 22, 1994
    Assignee: White Consolidated Industries, Inc.
    Inventor: James M. Edwards
  • Patent number: 5310090
    Abstract: The present invention provides a dishwasher access-door mounted dishwasher detergent dispenser having an improved assembly. The dispenser includes an outer bow-tie shaped door which has a central shaft extending therefrom. The shaft extends through the access door, and through a stationary actuating member and a rotary cam and latch member. A terminal end of the shaft provides a transverse bore through which is loosely slip-fit a retaining pin. The cam and latch member includes a cylindrical hub and a projecting member. The cylindrical hub includes an upstanding cylindrical wall and a camming surface. The cylindrical wall, which extends above and generally surrounds the camming surface, defines a notched opening through which the terminal end of the shaft is accessible for insertion and removal of the slip fit pin mounted therein. The cylindrical wall surrounds or encloses opposite ends of the mounting pin and prevents the unintentional or accidental removal of the mounting pin from the shaft.
    Type: Grant
    Filed: March 30, 1993
    Date of Patent: May 10, 1994
    Assignee: White Consolidated Industries, Inc.
    Inventor: Marion L. Taylor, Jr.
  • Patent number: 5287866
    Abstract: In a dishwashing system, a dishwashing machine (10) is provided to wash a rack holding thereon tableware in a washing chamber, a wagon (W) is provided to have therein plural stages of horizontal storage shelves in an up-and-down direction, and an elevator (E) is disposed between the wagon and the dishwashing machine. On the elevator (E), a drive control device is provided to move a ramp (56) of the elevator by a driving mechanism (60) toward a position facing to one of shelves of the wagon after the rack has been placed at a reference position of the ramp (56) by way of timing belts (57i) (57l), to drive the timing belts by a timing belt mechanism (57) so as to store the rack onto the shelf, to stop the timing belt mechanism upon completing storage of the rack and to drive the driving mechanism till the ramp reaches the reference position. These operations are repeated by the drive control device.
    Type: Grant
    Filed: June 15, 1992
    Date of Patent: February 22, 1994
    Assignee: Hoshizaki Denki Kabushiki Kaisha
    Inventors: Hiroshi Torimitsu, Chiyoshi Toya, Tomio Suyama, Sadayuki Hirate, Tomoko Yamamura
  • Patent number: 5267580
    Abstract: A conveyor dishwashing machine in which racks of dishes are conveyed from a loading surface through a hood which presents washing and rinsing zones and onto a discharge surface. In the washing zone, wash spray is applied to the dishes from a spray system which is easily removed for cleaning and easily replaced in the proper position. In the rinsing zone, a rinse curtain applies an initial rinse and creates a barrier against the wash spray. A final rinse of clean city water is applied subsequent to the rinse curtain. Automatic controls operate the machine with a minimum of human intervention.
    Type: Grant
    Filed: November 2, 1992
    Date of Patent: December 7, 1993
    Assignee: TCA, Inc.
    Inventor: Russell L. Payzant
  • Patent number: 5137041
    Abstract: A glass washer has a cabinet enclosing a water reservoir having a drain, a water inlet, a spray box, a motor driven rotary tray above the spray box, and a pump for causing water flow through the spray box to spray the contents of the tray. A control senses incoming water temperature and holds the drain open until the water temperature reaches a predetermined level and then closes the drain.
    Type: Grant
    Filed: September 21, 1990
    Date of Patent: August 11, 1992
    Assignee: Glastender, Inc.
    Inventor: Jon D. Hall
  • Patent number: 5018550
    Abstract: A dishwasher is provided with an improved apparatus for protecting the tub from being overfilled in the form of a float having a float stem that is automatically captured upon insertion through a passage in the tub bottom wall such that the float will be restrained against disengagement from the tub bottom wall. The float is vertically movable to operate a control switch for regulating the level of water within the tub. Preferably a retaining ring is carried on a stem of the float which is automatically biased through a varying diameter keyway and is subsequently moved to a captured position below the member having the keyway.
    Type: Grant
    Filed: October 19, 1990
    Date of Patent: May 28, 1991
    Assignee: Whirlpool Corporation
    Inventor: Mark A. Burdorff
  • Patent number: 5017852
    Abstract: An electric control apparatus for a dishwashing machine having a washing chamber, a wash pump arranged to be driven by an electric motor for pumping up wash water from a wash water storage tank in the washing chamber, and a revolving wash arm arranged within the washing chamber to be supplied with the wash water from the pump for directing jet streams of the wash water to a rack of tableware placed in the washing chamber. The electric control apparatus includes a microcomputer programmed to memorize control data defined in relation to the lapse of washing time such that the supply amount of wash water to the wash arm is intermittently increased and decreased after gradually increased up to a predetermined amount at an initial stage of washing operation and to control the rotational speed of the electric motor in accordance with the lapse of washing time based on the control data.
    Type: Grant
    Filed: January 25, 1990
    Date of Patent: May 21, 1991
    Assignee: Hoshizaki Denki Kabushiki Kaisha
    Inventors: Osamu Nagata, Tokihiro Kuwahara, Yukichi Suzawa, Hiroaki Kamino, Tomio Suyama, Tomoyoshi Konno
  • Patent number: 5006767
    Abstract: In a dishwashing machine having a washing chamber, an electrically operated wash pump for pumping out wash water from a wash tank in the washing chamber, an electrically operated rinse pump for pumping out heated water from a gas booster heater, and wash and rinse arms arranged within the washing chamber to be supplied with the wash and heated water from the wash and rinse pumps for directing jet streams of the wash and heated water to tableware racked in the washing chamber respectively, an electric control apparatus is arranged to mix cold water from a source of cold water into the heated water to form mixing water and to control the rinse pump such that the rinse arm directs jet stream of the mixing water to the racked tableware.
    Type: Grant
    Filed: March 2, 1990
    Date of Patent: April 9, 1991
    Assignee: Hoshizaki Denki Kabushiki Kaisha
    Inventors: Fumio Maruyama, Tomio Suyama, Hiroaki Kamino, Koji Suyama, Tokihiro Kuwahara, Osamu Nagata
  • Patent number: 4743820
    Abstract: An electric appliance control system is disclosed in which a logic controlled, solid-state, electronic system is used in conjunction with a mechanical switching device in the form of a cam disc operating a plurality of cam-operated switches. The control system combines the capabilities of performing complicated and numerous operational programs with the reliability of the cam-operated mechanical switching device.
    Type: Grant
    Filed: November 25, 1985
    Date of Patent: May 10, 1988
    Inventor: Wayne Veach
  • Patent number: 4689089
    Abstract: A dishwashing machine and a method for washing ware therewith are disclosed. The machine includes a wash chamber, a tank for holding a cleansing liquid, a spray system including a selectively operable pump for spraying ware to be cleaned with liquid from the tank, and a heater for heating the liquid within the tank. The heater is regulated to maintain the liquid substantially at a first predetermined temperature whenever the pump is operating, and to maintain the liquid substantially at a second predetermined temperature greater than the first temperature whenever the pump is not operating.
    Type: Grant
    Filed: September 21, 1984
    Date of Patent: August 25, 1987
    Assignee: Hobart Corporation
    Inventors: Mark E. Eberhardt, Jr., Francis J. Caldwell
  • Patent number: 4468600
    Abstract: A microcomputer-based electronic controller for a dishwasher utilizes a motor driven timing cam for selectively energizing the electromechanical components of the dishwasher. An internal diagnostic routine in the microcomputer insures that the timing cam is advanced when the microcomputer calls for power to be applied to the motor.
    Type: Grant
    Filed: March 23, 1983
    Date of Patent: August 28, 1984
    Assignee: The Singer Company
    Inventors: Richard C. Barthel, Richard D. Roy