The patent's assignee is
News editors obtained the following quote from the background information supplied by the inventors: "The present invention pertains to the art of dishwashers and, more particularly, to a rapid heat system for a multi-tub type dishwasher that diverts power from an inactive washing tub to an active washing tub so as to rapidly heat washing fluid in the active washing tub.
"In general, various types of dishwashers are known in the art. One type of dishwasher which is experiencing increased popularity is a drawer-type dishwasher. Typically, a drawer-type dishwasher includes a drawer or pull-out washing tub slidably mounted in a cabinet. A dish rack is provided within the washing tub to support dishware and other items during a washing operation. In some cases, the dishwasher will include first and second drawers or washing tubs arranged in an upper and lower configuration. A washing operation can be performed in either one, the other, or both of the washing tubs. That is, the first and second washing tubs are capable of performing washing operations individually or simultaneously.
"Most household dishwashers are powered by a dedicated, generally, 15-20 amp supply circuit. When both the first and second washing tubs are operating simultaneously, power must be shared so the supply circuit is not overloaded. Generally, sharing power between the first and second washing tubs does not pose any problems. Wash pumps, drain pumps and other control elements do not, in most cases, have high power requirements. However, heating units employed to heat a washing fluid do possess high power requirements.
"Given that the first and second washing tubs are capable of operating both individually and simultaneously, the first and second washing tubs include corresponding first and second heating units. Thus, in order to ensure that the supply circuit is not overloaded, the combined current draw of both the first and second heating units cannot exceed a current rating of the supply circuit. With this configuration, the ability to quickly heat washing fluid in either the first and/or second washing tubs is limited. That is, even if only one of the first and second washing tubs is operating or active, the heating element must still operate at a relatively low power level.
"Based on the above, there exists a need in the art for a system to rapidly heat washing fluid in a drawer-type dishwasher. More specifically, there exists a need for a system that can direct power to rapidly heat one washing tub of a two drawer dishwasher if the other washing tub is inactive."
As a supplement to the background information on this patent application, VerticalNews correspondents also obtained the inventors' summary information for this patent application: "The present invention is directed to a dishwasher including a first washing tub, preferably defined by a first drawer, and a second washing tub, preferably defined by a second drawer. The dishwasher is capable of performing a washing operation in each of the first and second washing tubs separately and/or simultaneously. Toward that end, the first and second washing tubs have associated wash pumps and drain pumps, but preferably a common controller. In addition, the dishwasher includes first and second heating units associated with the first and second washing tubs respectively. More specifically, each of the first and second heating units is operable at multiple heating levels so as to heat washing fluid during select portions of a washing operation. The controller is operatively connected to each of the first and second heating units, as well as each wash pump and drain pump.
"In accordance with a preferred embodiment of the present invention, prior to activating the first heating unit to heat washing fluid in the first washing tub, the controller determines whether the second washing tub is active. A washing tub can be defined as being active if, for example, a washing operation is underway or if its associated heating unit is being powered. In any event, if the second washing tub is active, the controller will establish a low power level requirement and operate the first heating unit, i.e., the heating unit associated with the first washing tub, at a low or normal power level. On the other hand, if the second washing tub is inactive, the controller will establish a high power level requirement and operate the first heating unit at a high power level so as to rapidly heat the washing fluid and, thus shorten the washing operation.
"In accordance with one aspect of the preferred embodiment, each of the first and second heating units is constituted by a dual element heating unit. In this manner, when the controller establishes the low power level requirement for the first heating unit, only one of the dual elements is activated while, for a high power level requirement, both of the dual elements are activated. In accordance with another aspect of the preferred embodiment, each of the first and second heating units is constituted by a high capacity heating element operated by a microprocessor. In this manner, when the controller establishes a low power level requirement, the microprocessor establishes a corresponding low heat setting while, for a high power level requirement, the microprocessor establishes a corresponding high heat setting. In this manner, in the event that only one of the first and second washing tubs is active, the controller will divert power from the inactive washing tub to the active washing tub in order to rapidly heat the washing fluid and shorted the washing operation.
"Additional objects, features and advantages of the present invention will become more readily apparent from the following detailed description of a preferred embodiment when taken in conjunction with the drawings wherein like reference numerals refer to corresponding parts in the several views.
BRIEF DESCRIPTION OF THE DRAWINGS
"FIG. 1 is an upper right perspective view of a drawer-type dishwasher incorporating a rapid heat system constructed in accordance with the present invention;
"FIG. 2 is an upper perspective view of a wash tub of the dishwasher of FIG. 1;
"FIG. 3 is a lower perspective view of the wash tub of FIG. 2, illustrating a heating unit assembly constructed in accordance with one aspect of the present invention; and
"FIG. 4 is a flow diagram illustrating operation of the rapid heat system of the present invention."
For additional information on this patent application, see: HEDSTROM,
Keywords for this news article include: Electronics, Microprocessors,
Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2014, NewsRx LLC
Most Popular Stories
- Senate Dems Pull All-Nighter on Global Warming
- Why New Workers Can't Get Ahead
- myLINGO Translates Hollywood Films into Spanish
- Rand Paul Takes Pot Shot at Ted Cruz
- Obama Plugs ACA on Zach Galifianakis Show
- Snowden Urges Silicon Valley to Resist Internet Spying
- Toledo Jeep Plant Hiring Part-Timers
- OECD Forecasts Slowdown in Global Growth
- Miley Cyrus Performs in Undies After Costume Goes Missing
- Dianne Feinstein Accuses CIA of Spying on Congress