Patent Grant
RE44337
This invention relates in general to automated water dispensers having both single and multiple tanks for the dispensing of hot and room temperature water. This invention also relates to an energy efficient method, delivering far superior energy efficiency as compared to conventional continuous operation hot water tank systems. The invention described below provides for a consumer activated hot water on demand system, providing superior temperature, performance and reliability to traditional heating systems employed within water dispensers.
There are various types of water dispensers disclosed in the prior art, however many of these dispensers are complex in design and costly in manufacturing. Specifically many of these dispensers address the ability to have a reservoir of water that dispenses hot water on command, as opposed to our invention which provides hot water on demand. Many of these dispensers maintain the water at a constant pre-determined temperature by having a sensor set to the pre-determined temperature which engages a heating unit when the temperature drops below the pre-determined temperature.
Conventional heating systems are utilized in all water dispensing applications that are currently available in the retail market. Conventional heating systems utilize a variety of approaches, including immersion style and banded heating elements, which are all based on resistance style heating mechanisms. Temperature is controlled either electronically or through the use of mechanical thermostats, and regulates the temperature of the water between a low and upper set-point as defined by the control mechanism utilized. These heating systems operate at all times, e.g., 24 hours a day, 7 days a week, continuously, retaining the fluid within the hot tank system within the pre-determined control levels. Continuous operation of heating systems is known to be very inefficient with respect to energy consumption, and leads to significant performance issues, reducing component longevity.
Prior art combination water dispensers have been devised to address these issues. For example, U.S. Pat. No. 5,019,690 issued on May 28, 1991 to Knepler discloses a boiling water, dispenser includes a hot water reservoir, a user-actuated faucet for drawing boiling water from a discharge zone at the top of the reservoir, and a solenoid-actuated valve for admitting unheated water to an inlet zone at the bottom of the reservoir. An electric resistance heating element within the reservoir is supplied with AC current through a series-connected bilateral switch device which is periodically switched on and off in response to the sensing of steam in a reservoir venting conduit to maintain the dispensing temperature at the boiling point.
U.S. Pat. No. 5,038,752 issued to Anson on Aug. 13, 1991 discloses a sensor assembly for a boiling water dispenser that includes clamping members for mounting a sensor such as a thermister in position to sense the presence and absence of steam. The activation of this sensor is based upon steam generation, which requires water temperatures in excess of 100° C. (212° F.).
U.S. Pat. No. 4,871,089 issued to Rader et al. on Oct. 3, 1989 and relates to a hot water dispenser is provided for dispensing a selected volume of water at a predetermined water temperature. The dispenser has a body defining a pre-determined sized cavity having an inlet for receiving cold water and an outlet for dispensing hot water. A heating mechanism is disposed within the body for heating the water contained within the cavity. A manually operable timer switch is operated to energize the heating mechanism and to select a time period for maintaining the heating mechanism energized. This selected time period determines the selected volume of heated water dispensed. A thermally responsive mechanism enables dispensing water from the outlet responsive to the predetermined water temperature of the heated water.
Knepler is the owner of U.S. Pat. No. 4,978,833 which issued on Dec. 18, 1990 and discloses a hot water dispenser includes a hot water reservoir, a user-actuated faucet for drawing hot water from an outlet zone near the top of the reservoir, and a solenoid-actuated valve for admitting unheated water to an inlet zone at the bottom of the reservoir. An inline flow regulator establishes an inlet flow rate less than the faucet flow rate to maximize the volume of hot water available at the faucet. An electric resistance heating element within the reservoir is supplied with AC current through a series-connected bilateral switch device which is periodically switched on and off in accordance with the temperature of water sensed by a sensor at the faucet to maintain a constant dispensing temperature. The switch device is thermally coupled to the bottom of the reservoir such that the reservoir acts as a heat sink to dissipate heat generated during switching. An indicator lamp conditioned by the sensor confirms to the user that the dispensing temperature is within a predetermined range.
Forsberg is the owner of U.S. Pat. No. 6,182,453 which issued on Feb. 6, 2001, and describes a portable water generating system for production of high-purity liquid water by condensation of dew from ambient air. Forsberg describes a heated, food type, stainless steel tank with an insulating jacket, being in fluid communication with the heated fluid delivery control valve and the ambient temperature water in the storage tank. Water at a temperature of up to about 75° C. (167° F.) can be delivered from the heated fluid delivery control valve. Forsberg additionally describes an alternate method of supplying heated water through a resistance heated tube of sufficient length to heat water being delivered from the ambient temperature zone of the reservoir to the hot water external valve.
Thus a water dispenser having a superior energy efficient, -user activated hot water on demand mechanism, with a single dispensing mechanism for both room temperature water and hot water where the hot water is generated by a user activated on demand heating mechanism is desirable.
An object of one aspect of the present invention is to provide an improved combination water dispenser with a user activated on-demand heating mechanism.
In accordance with one aspect of the present invention there is provided a combination water dispenser with a user activated on-demand heating mechanism including a reservoir having an automatic inlet means for replenishing water into the reservoir and a controlled water outlet means for dispensing water from the reservoir. The reservoir includes a reservoir heating element which has an applied electric current for heating the water. The heating element used on the reservoir may be either an immersion or external surface (banded or base mounted) element. A visible and/or audible indicating means for indicating the activation and deactivation of the reservoir heating element is included on the dispenser. A user actuated means adapted to simultaneously activate the reservoir heating element and the indicating means is positioned on the dispenser. A temperature regulating means responsive to the temperature of the water monitors the temperature of the water during the heating of the water. Finally the dispenser includes an automatic deactivation means adapted to deactivate the reservoir heating element upon receiving a signal from the temperature regulating means.
Conveniently, the dispenser is freestanding and/or convertible to a countertop application and can dispense either heated hot water or room temperature water. Both the hot and room temperature waters can be dispensed from the same tap, therefore not requiring two taps on the dispenser. Preferably the water automatically refills the reservoir via a gravity fed bottle system and or pressurized point-of-use system so the reservoir always has water either at room temperature or hot water via the activation of the heating element.
The user activated means of the reservoir heating element allows for the user to activate the heating of the water when desired rather than having hot water provided through a continuously active heating system that operates at all times (e.g., “24/7”). The dispenser may also include a second reservoir that can dispense cold water via a means of refrigeration.
Advantages of the present invention are: the user activation of the heating element allows for the user to control when the hot water is required rather than having hot water on demand, reduced energy costs as the water is not being constantly heated to maintain the temperature of the hot water, reducing manufacturing costs as the heating element and construction of the dispenser can be simplified, reduced maintenance costs as the heating elements are not being constantly used so that there is wear resulting in breakdown of the heating element, the dispenser may also include a cold water reservoir that can provide cold water as well, the construction of the dispenser only requires a single reservoir for both hot and room temperature water therefore allowing for a compact design and only requires one tap to dispense both types of water.
A detailed description of the preferred embodiments is provided herein below by way of example only and with reference to the following drawings, in which:
In the drawings, preferred embodiments of the invention are illustrated by way of example. It is to be expressly understood that the description and drawings are only for the purpose of illustration and as an aid to understanding, and are not intended as a definition of the limits of the invention.
Referring to
The dispenser 10 further includes an indicating means 17 for indicating the activation and deactivation of the reservoir heating element 15. A user activated means 18 is adapted to simultaneously activate the reservoir heating element 15 and the indicating means 17. The dispenser 10 further includes a temperature regulating means 19 that is responsive to the temperature of the water and monitors the temperature of the water during the heating of the water. Finally the dispenser 10 includes a safety mechanism for automatic deactivation means 20 adapted to deactivate the reservoir heating element 15 which will activate upon any failures with the primary temperature regulating thermostat 19.
More specifically the on demand heating system reservoir 13 can be utilized for both room temperature water and hot water thereby having only a single reservoir for both types of water. The on demand heating system reservoir's 13 automatic inlet means 14 may be further defined as a gravity flow feed system 21 that utilizes gravity to replenish the water level in the on demand heating system reservoir 13. Conventional water jugs and/or water dispenser filtration systems may sit on top of the dispenser 11 to act as a supply of water. The controlled water outlet means 22 may be further defined as a dispensing tap 32 that can be used to both dispense both room temperature water and hot water.
The reservoir heating element 15 which has an applied electric current 16 for heating the water may be further defined as an externally mounted or immersion style conventional electric resistance heating element that is supplied with AC current when the reservoir heating element 15 is activated. The indicating means 17 for indicating the activation and deactivation of the reservoir heating element 15 may be further defined as indicator lights, or an audible indicator or a visible indicator mechanism that identifies when the reservoir heating element 15 has been activated. Specifically the indicator light 17 will be flashing during the heating cycle process, and will turn to a steady on state upon the primary thermostat 19 signaling that the hot water within the reservoir 13 has achieved the maximum optimal temperature. Furthermore, the indicator light 17 will turn off when the water temperature inside the on demand heating system reservoir 13 drops below the pre-determined safety set-point.
The user actuated means 18 for initiating the on demand heating mechanism may be further defined as a mechanism that the user can engage such as a tab or button on the outside surface of the dispenser 10 that when engaged, simultaneously activates the reservoir heating element 15, to heat up the water at the user's request, and therefore also engages the indicating means 17 as outlined above. The user therefore controls when the on demand hot water system and the activation of the reservoir heating element 15, resulting in an energy efficient heating application. The on-demand heating mechanism will only be active upon engagement of the user actuated means 18, thereby eliminating any stand by energy consumption during periods of dormancy.
The temperature regulating means 19 that is responsive to the temperature of the water and monitors the temperature of the water during the heating of the water may be further defined as aone or more temperature cycling thermistors that monitor the temperature of the water. A thermistor is a type of resistor whose resistance varies with temperature. Specifically the cycling thermistors isare calibrated to monitor and control the temperature of the water when it is heated. As such the one or more temperature cycling thermistors also interactsinteract and reflectsreflect the activation of the indicating means 17. More specifically, the temperature cycling thermistor 19 also works in conjunction with the user actuated means 18 to regulate the activation of the indicating means 17. In one implementation, the temperature regulating means is a series of thermistors calibrated to monitor the pre-determined temperature of the water. Upon the temperature cycling thermistor 19 monitoring and sensing that the water has reached the predetermined hot temperature, a signal is sent to deactivate the reservoir heating element 15 and actuate the indicating means 17 to a steady on state. The reservoir heating element 15 will automatically shut down upon completion of the user actuated heating cycle, and will remain in a dormant state indefinitely until re-activation by means of the user actuated mechanism 18.
The combination water dispenser with heating mechanism 10 may also include a second reservoir adapted to have a reservoir cooling element within the second reservoir operable from the applied electric current for cooling the water in the reservoir. In this embodiment the combination water dispenser may dispense hot or room temperature water out of a first dispensing tap and dispense cooled water from a second dispensing tap. The second reservoir may be filled from the automatic inlet means to a desired level.
Other variations and modifications of the invention are possible. All such modifications or variations are believed to be within the sphere and scope of the invention as defined by the claims appended hereto.
This application claims the benefit under 35 U.S.C. §119(e) of U.S. Provisional Application No. 60/814,562 filed on Jun. 19, 2006.
| Number | Name | Date | Kind |
|---|---|---|---|
| 4871089 | Rader et al. | Oct 1989 | A |
| 4978833 | Knepler | Dec 1990 | A |
| 5019690 | Knepler | May 1991 | A |
| 5038752 | Anson | Aug 1991 | A |
| 5111969 | Knepler | May 1992 | A |
| 5192004 | Burrows | Mar 1993 | A |
| 5667103 | Donselman et al. | Sep 1997 | A |
| 5678734 | Walker | Oct 1997 | A |
| 5833096 | Ohu | Nov 1998 | A |
| 5911341 | Donselman et al. | Jun 1999 | A |
| 6101835 | Butsch et al. | Aug 2000 | A |
| 6139726 | Greene | Oct 2000 | A |
| 6182453 | Forsberg | Feb 2001 | B1 |
| 6266485 | DeSantis et al. | Jul 2001 | B1 |
| 20020170921 | Tan et al. | Nov 2002 | A1 |
| 20030183649 | Tan et al. | Oct 2003 | A1 |
| 20040065684 | Cooke et al. | Apr 2004 | A1 |
| 20040129723 | Meder et al. | Jul 2004 | A1 |
| Number | Date | Country | |
|---|---|---|---|
| 60814562 | Jun 2006 | US |
| Number | Date | Country | |
|---|---|---|---|
| Parent | 11525959 | Sep 2006 | US |
| Child | 13219092 | US |
