Electric resistance heating devices – Heating devices – Continuous flow type fluid heater
Reexamination Certificate
2002-07-24
2004-03-02
Look, Edward K. (Department: 3742)
Electric resistance heating devices
Heating devices
Continuous flow type fluid heater
C392S465000, C099S281000
Reexamination Certificate
active
06701068
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to coffee makers and more particularly to an electric heating device having two heating elements for a coffee maker for increasing a temperature of hot water leaving an outlet.
BACKGROUND OF THE INVENTION
A heating device for a coffee maker or water dispenser is well known. A conventional electric heating device
30
for a coffee maker is shown in
FIG. 1
in which a portion of a cold-water supply line
20
connected to the bottom of a water tank
10
is contacted by the electric heating device
30
so that water flowing through the cold-water supply line
20
can be heated. The heated water is then fed to a hot-water supply line
40
prior to leaving an outlet
50
.
However, the prior art suffered from a disadvantage. For example, the hot-water supply line
40
may be relatively long so that temperature of the heated water leaving the outlet
50
may drop significantly because there is no insulation around the hot-water supply line
40
for keeping the temperature of water leaving the outlet
50
at almost the same as that measured at the start of the hot-water supply line
40
. In other words, the water is not as hot as expected. Thus, the need for improvement exists.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide an electric heating device for a coffee maker having a water tank and a water pipe coupled to the bottom of the water tank, the pipe including a cold-water supply section, a first heating section, a first hot-water supply section, a second auxiliary heating section, and a second hot-water supply section having an outlet. The heating device comprises a first heating element contacting the first heating section; and a second heating element contacting the second auxiliary heating section. Water flowing from the water tank to the first heating section via the cold-water supply section is first heated by the first heating element. The heated water flows in turn from the first heating section to the second auxiliary heating section via the first hot-water supply section for being further heated by the second heating element. Finally, the further heated water is fed to the second hot-water supply section prior to leaving the outlet. By utilizing the invention, a temperature of water leaving the outlet can be kept at an acceptably high level.
REFERENCES:
patent: 3552298 (1971-01-01), Bufkin et al.
patent: 5193139 (1993-03-01), Schiettecatte
patent: 5551331 (1996-09-01), Pfeifer et al.
patent: 6481339 (2002-11-01), Castleberry
Campbell Thor
Kamrath Alan D.
Look Edward K.
Uni-Splendor Corp.
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