1. Field of the Invention
The present invention pertains to the art of dishwashers and, more particularly, to a dishwasher including a system for adding a washing agent into a washing chamber by delivering washing fluid to a booster agent dispenser provided on an upper rack of the dishwasher during a select portion of an overall washing operation.
2. Description of the Related Art
In the art of dishwashers, it is known to provide multiple, vertically spaced spray arms within a single wash tub in order to enhance the spray patterns of washing fluid. For use with these various spray arm arrangements, many different types of fluid distribution systems have been developed to address different problems or to provide a dishwasher with specific functionality. For instance, in order to increase the distribution of washing fluid, it is known in the art to provide a dishwasher tub with a lower, rotatable spray arm mounted for rotation below a lower rack, an upper, rotatable spray arm mounted above an upper rack and an intermediate, rotatable spray arm provided below the upper rack. In such an arrangement, the intermediate spray arm is mounted to the upper rack for concurrent movement into and out of the tub of the dishwasher. To accommodate this movement, a fluid connection must be made to the intermediate spray arm upon retraction of the upper rack into the tub.
If the upper rack is vertically adjustable, additional provisions must be made to provide the necessary fluid connection when the upper rack is in each of the various vertical orientations. In general, this adjustability function is accomplished by fixedly mounting a valve and manifold assembly to the tub at the height of the upper rack, with the manifold including multiple ports which can be alternatively accessed to provide the requisite washing fluid flow to the intermediate spray arm.
As an additional consideration, it can be desirable to provide a flow control system to regulate the flow timing to each of the spray arms. For instance, based on water pressure or other reasons, it may not be feasible to provide flow to each of the spray arms simultaneously. If this is the case, separate and distinct fluid conduits and/or complicated valving may be employed in combination with a water diverter mechanism in order to selectively direct the washing fluid to the lower wash arm, the upper wash arm, the intermediate wash arm or certain combinations of the wash arms.
As a still further consideration, it can be desirable to enable the timed delivery of additional washing agent into a dishwashing chamber in connection with the regulated flow to the spray arms. In this regard, many attempts have been made in the art of dishwashers to provide improved detergent dispersion and effectiveness. One solution to the problem involves directing a cleaning agent from a dispenser directly into a spray arm. Examples of this type of dispenser are demonstrated by UK Patent Application No. GB 2321590 and U.S. Pat. No. 5,235,994. Another solution involves impinging washing fluid from a rotating spray arm directly into an exposed dispenser container to slowly dissolve and distribute a cleaning agent, as demonstrated by International Publication WO 2009/083576. It is also known in the art to provide an auxiliary dispenser for enhancing the performance of a dishwasher as taught by U.S. Pat. No. 7,475,696.
With all the above in mind, there is still seen to be a need in the art of dishwashers for an improved cleaning agent dispersal system for use in selectively supplementing the operation of a standard detergent dispenser in providing an optimal amount of detergent during distinct portions of an overall washing operation. More specifically, it is seen as beneficial to provide a dispenser that can be easily accessed by a user and selectively utilized to aide in the cleaning of kitchenware by quickly and effectively distributing a chemical agent within a dishwashing chamber, particularly during the distribution of washing fluid to one or more auxiliary spray units provided on an upper rack of a dishwasher.
The present invention provides for an enhanced dishwasher washing system including, in addition to the potential for lower and upper spray arms within a tub of the dishwasher, an upper rack carrying a booster agent dispenser and at least one auxiliary spray unit. A fluid distribution system, including a multi-tube feed arrangement in combination with a rack supported manifold, is employed to provide for selective distribution of washing fluid to a housing of the booster agent dispenser and the auxiliary spray unit.
In accordance with one embodiment of the invention, the booster agent dispenser includes a drawer slidably mounted for movement into and out of the housing, with the drawer being configured to receive a washing agent. In another embodiment, the housing is located in a corner region of the upper rack, preferably with the housing having a sloped bottom wall portion which covers or extends over at least part of an auxiliary spray unit. In either case, during a select portion of an overall washing operation, the fluid distribution system directs washing fluid into the housing, causing the washing fluid to mix with the washing agent and the mixture to be dispersed into the tub, such as through a series of dispersal openings provided in one or more outer walls of the housing.
Additional objects, features and advantages of the present invention will become more readily apparent from the following detailed description of preferred embodiments when taken in conjunction with the drawings wherein like reference numerals refer to corresponding parts in the several views.
With initial reference to
In a manner known in the art, upper rack 16 is horizontally shiftable between a first, retracted position wherein upper rack 16 is entirely within the confines of washing chamber 14 as shown in
Disposed within tub 5 and, more specifically, mounted within a central opening formed in bottom wall 8 of tub 5, is a pump assembly 30 constructed in a manner known in the art, such as that represented by U.S. Pat. No. 7,146,992 which is incorporated herein by reference. Extending about a substantial portion of pump assembly 30, at a position raised above bottom wall 8, is a heating element 44. In a manner known in the art, heating element 44 preferably takes the form of a sheathed, electric resistance-type heating element. In the embodiment shown, pump assembly 30 is adapted to direct washing fluid to a lower spray arm 47, an intermediate spray arm 48 and an upper arm 49.
For the sake of completeness, dishwasher 2 also has associated therewith a drain hose 85 including at least one corrugated or otherwise curved portion 89 that extends about an arcuate hanger 92 provided on an outside surface of side wall 10. Drain hose 85 is also preferably secured to tub 5 through various clips, such as that indicated at 94. In this manner, an upper loop is maintained in drain hose 85 to assure proper drainage in a manner known in the art. As the exact structure and operation of pump assembly 30 of dishwasher 2 is not part of the present invention, it will not be discussed further herein. Instead, the present invention is directed to particulars of the washing system associated with upper rack 16. More specifically, the invention is concerned with the manner in which washing fluid can be selectively delivered from pump assembly 30 through a fluid distribution or feed tube system and a booster agent dispenser 98 carried by upper rack 16.
In connection with the flow of washing fluid,
With reference to
As shown in
At this point, it should be noted that distribution head 100 preferably provides for multiple distinct flows which are regulated during a washing operation such that the flows are not simultaneously provided in order to enhance flow pressure. In connection with regulating these various flows, a diverter valve unit (not shown) is provided beneath head 100 and incorporated into pump assembly 30. In general, the function and operation of a diverter valve unit in the dishwasher art is known as evidenced by the disclosure in U.S. Pat. No. 7,914,625, incorporated herein by reference. Therefore, as the specific details of the operation of diverter valve unit 126 is not considered part of the present invention such that it will not be further discussed herein. Instead, it is merely important to recognize that the distribution of washing fluid to the various components of the overall dishwasher can be controlled throughout a washing operation, such as based on user washing selections.
More specific to the invention, it is desired to increase the washing agent concentration during certain portions of a washing operation. To this end, in order to supplement the dispersal of washing agent from dispenser 24, the invention provides for the introduction of additional washing agent which, in this embodiment, is provided for through an overall booster agent dispersal system. For this purpose, washing fluid must be supplied to booster agent dispenser 98. With this in mind, first upper distribution tube assembly 202 is shown formed from multiple, interconnected pieces, including a flow tube 216 coupled to port 186 of manifold 180 and leading to a T-connector (not shown) beneath booster agent dispenser 98. With this arrangement, the flow in flow tube 216 is bifurcated so as to flow in opposing directions into a pair of sub-arm assemblies 231 and 232 hung on upper rack 16 by brackets 233 and 234, while a portion of the flow is directed into booster agent dispenser 98 as detailed more fully below.
As each sub-arm assembly 231, 232 is identically constructed, details will now be made of sub-arm assembly 231 and it is to be understood that sub-arm assembly 232 has corresponding structure. As clearly shown in
Reference will now be made to
Booster agent dispenser 98 also includes a drawer 375 including a front wall 380, a bottom wall 381 and side walls 382 and 383. Drawer 375 need not include a rear wall, but a reduced height wall or one with various openings could be provided. As also shown in these drawings, side wall 382 is formed with a plurality of side discharge openings 390 and, much like the inclusion of side discharge openings in side wall 307, side wall 383 of drawer 375 is also preferably provided with corresponding openings.
With this arrangement, drawer 375 can be slid relative to housing 300 between an extended position as shown partially in
At this point, it should be recognized that the frontal positioning and operation of booster agent dispenser 98 is extremely convenient as drawer 375 is readily accessible such that it can be easily withdrawn from within housing 300 and loaded with washing agent. If a solid washing agent tablet, disk or the like is employed, booster agent dispenser 98 can be loaded once with washing agent which can then be utilized for multiple washing cycles. In addition, if desired, drawer 375 can be readily slid from housing 300 and itself placed in upper rack 16 for washing. Although booster agent dispenser 98 is shown used in combination with auxiliary spray units in the form of exterior and interior corner nozzles 242 and 249, it should be readily apparent that various other configurations could also be employed. For instance, flow tube 216 can go directly into housing 300 from which sub-arm assemblies 231 and 232 can project. In this case, the added washing agent mixture will be introduced through the auxiliary spray units. At the same time, intermediate spray arm 48 can receive a flow of fluid directly from flow tube 216, or a separate flow tube stemming from manifold 180. In addition, it is possible to tap off a flow from flow tube 216 at various portions between rear wall portion 140 and front wall portion 139 of upper rack 16 such that, for example, either flow tube 216 or an additional flow tube stemming from manifold 180 could be bifurcated adjacent rear wall portion 140 to provide corner nozzles at the junctions of rear wall portion 140 and side wall portions 141 and 142 and/or the junction of side wall portions 141 and 142 and front wall portion 139. In any case, it should be readily apparent that there are various ways in which washing fluid can be directed into housing 300 and drawer 375 of booster agent dispenser 98, as well as at least one auxiliary spray unit such as nozzle 242 or nozzle 249, and even intermediate spray arm 48, without departing from the invention.
Reference will now be made to
Given open top 410, housing 400 can be readily loaded with a washing agent, such as in tablet form. To enable dispersion of the washing agent, a hole (not shown) is formed in second bottom section 432 and has projecting there through a supply tube 445 that stems from sub-arm assembly 231. Supply tube 445 includes an open upper end 246. With this arrangement, washing fluid directed into flow tube 216 and sub-arm assembly 231 will lead to each of exterior corner nozzle 242, interior corner nozzle 249 and supply tube 445. The portion of washing fluid flowing into supply tube 445 will exit upper end 446 and function to mix with the washing agent within housing 400. In order to disperse the mixture, housing 400 is provided with a plurality of discharge openings. In the embodiment shown, housing 400 is depicted as having a first plurality of side discharge openings 450 arranged along side wall 408. Certainly, various other discharge openings, such as a second plurality of side discharge openings in side wall 406, such as indicated at 455, can also be provided.
As with the embodiment of
With this overall arrangement, it should be readily apparent that dishwasher 2 of the present invention can provide for a series of timed and controlled flow patterns for washing fluid, whether during a wash cycle or a rinse cycle. Based on the timing established for the flow of fluid into manifold 180 through distribution head 100, the booster agent dispenser system of the invention can be effectively utilized to supplement any initial washing agents provided for the washing operation utilizing dispenser 24. As the majority of the washing agent provided by dispenser 24 would be lost from tub 5 during draining operations, the inclusion of the booster agent dispenser system enables the washing level concentration to be substantially increased during latter portions of the washing operation, particularly to assure the effectiveness of the auxiliary corner spray units. In case, although described with reference to preferred embodiments of the invention, it should be readily understood that various changes and/or modifications can be made to the invention without departing from the spirit thereof. In general, the invention is only intended to be limited by the scope of the following claims.
The present represents a divisional application of U.S. patent application Ser. No. 13/615,931 filed Sep. 14, 2012 entitled “Dishwasher with Booster Agent Dispersal System”.
Number | Name | Date | Kind |
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5235994 | Comin | Aug 1993 | A |
7754024 | Koch | Jul 2010 | B2 |
20100139719 | Gnadinger | Jun 2010 | A1 |
Number | Date | Country | |
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20150223665 A1 | Aug 2015 | US |
Number | Date | Country | |
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Parent | 13615931 | Sep 2012 | US |
Child | 14693024 | US |