U.S. patent number 3,609,297 [Application Number 04/801,359] was granted by the patent office on 1971-09-28 for moisture warming device.
Invention is credited to Petros D. Christopoulos.
United States Patent |
3,609,297 |
Christopoulos |
September 28, 1971 |
**Please see images for:
( Certificate of Correction ) ** |
MOISTURE WARMING DEVICE
Abstract
A water-jacketed container with heat supplied to the jacket
space to heat water in the interior primarily by conductive
heat-transfer through the interior container wall. Articles are
supported above the level of the water in the interior, which is
isolated with respect to pressure from the jacket water to permit
side-jacketing above the level of the interior water. Condensate
drainage for unjacketed surfaces maintains the articles free of
liquid water.
Inventors: |
Christopoulos; Petros D. (Grand
Rapids, MI) |
Family
ID: |
25180894 |
Appl.
No.: |
04/801,359 |
Filed: |
February 24, 1969 |
Current U.S.
Class: |
219/439; 99/447;
219/430; 392/496; 126/369; 219/530 |
Current CPC
Class: |
A47J
27/10 (20130101); F24C 7/006 (20130101); A47J
27/04 (20130101) |
Current International
Class: |
A47J
27/04 (20060101); A47J 27/10 (20060101); F24C
7/00 (20060101); F27d 011/00 () |
Field of
Search: |
;219/530,540,281,325-326,430,439 ;165/19
;99/324-325,331,389,401,433,447 ;126/400,369,273 ;220/29 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
|
|
|
|
|
|
|
510,499 |
|
Apr 1952 |
|
BE |
|
820,555 |
|
Sep 1959 |
|
GB |
|
1,375,704 |
|
Sep 1964 |
|
FR |
|
Primary Examiner: Mayewsky; Volodymyr Y.
Claims
I claim:
1. In combination with a heat source, a device for heating articles
under conditions of high humidity, said device including a
container having a bottom and sidewalls, said container normally
having a relatively small quantity of water therein, a hermetically
sealed tank surrounding said container and having a bottom and
sidewalls spaced from the bottom and sidewalls respectively of said
container and defining a water space therebetween, said tank
normally containing water in heat transfer relationship to said
head source and extending upward in said water space along
substantially the entire surface of said container sidewalls for
evenly heating said container thereby heating the articles
contained therein and supplying heat to said small quantity of
water in said container for moisturizing the articles, means within
said container for supporting articles at a distance above the
water contained within said container, a top structure for said
container including opposite inclined top portions and at least one
door movable with respect to said container and extending at least
a portion of the distance between said top portions, said container
having a drainage-receiving trough extending along and below the
lower portion of said door to receive condensate therefrom, and a
conduit communicating between said trough and said means for
supporting articles whereby steam generated within said container
and precluded from condensing on said heated container sidewalls
will tend to condense on said door and run down into said trough
whence it will be conducted through said conduit past said means
for supporting articles.
2. A device as defined in claim 1, wherein said door extends along
substantially the full incline of said top portions and the full
distance between said top portions.
3. A device as defined in claim 2, wherein each of said top
positions has oppositely inclined portions, and doors extending
between said portions are connected to said container by hinges
extending along the lower portions of said doors.
4. A device as defined in claim 1, wherein said container includes
an exterior tank and an interior tank, said tanks having spaced
sidewalls providing said water-jacketed sides, and said tanks
having spaced bottom portions communicating with the space between
said sides, said device including heating means supplying heat to
the contents of the space between said bottom portions, said
interior tank being normally isolated from said sidewall and bottom
space with respect to liquid pressure.
5. A device as defined in claim 1, wherein said heat source is an
electrical heating element installed in said water space.
Description
BACKGROUND OF THE INVENTION
Heating devices for food articles usually are in the form of a
container saturated with water vapor. While it is desirable to
expose the food articles to moisture-laden heated air, it is very
undesirable to saturate these articles with liquid water. Except in
very elaborate pressurized structures, there is usually at least
some surface of the container which is below the point of
condensation of the water vapor. Condensate will therefore
accumulate on such a surface, and the most troublesome area where
this occurs is at the doors which are frequently swung open for
access to the interior. The prior devices with which applicant is
familiar do not adequately provide for minimizing condensation, or
for the conducting of it to some area where it does not soak the
food articles stored in the container.
SUMMARY OF THE INVENTION
A water-jacketed container centering in inner and outer tanks
having spaced side and bottom walls is provided with a heating
element preferably disposed between the spaced bottom walls. The
inner tank is kept out of communication with the jacket space, with
respect to liquid pressure, permitting the water-jacketing in the
sides to be considerably above the level of the interior water. The
interior water is exclusively for the provision of a
moisture-saturated atmosphere, and the presence of water-jacketing
over almost the full height of the sides eliminates the problem of
interior condensation on the sidewalls. The presence of the heating
element in the jacket, rather than in the interior water,
eliminates the possibility of an overgeneration of moisture in the
interior by a boiling action. With the jacketing arrangement, the
heat is evenly supplied around the entire side and bottom area of
the interior tank.
To facilitate the removal of condensate from the doors that swing
open at the top of the device for access to the interior, a pair of
the opposite walls are formed in a peak or slanted configuration,
similar to the roof of a house. This arrangement induces a movement
of accumulated drops of condensate to the side of the interior
space, where it is conducted back to the water of the interior tank
through suitable conduits leading the condensate past the platform
supporting the food articles. As an alternative, the condensate can
be delivered to the water-jacket space.
DESCRIPTION OF THE DRAWINGS
FIG. 1 is a perspective view of a complete heating device emboding
the present invention.
FIG. 2 is a fragmentary view on an enlarged scale showing the lower
portion of the device illustrated in FIG. 1, with a front panel
removed to show the installation of the electrical equipment and
drainage controls.
FIG. 3 is a perspective view of the top area of the tank, showing
the access doors swung open.
FIG. 4 is a vertical section on the plane 4--4 of FIG. 5.
FIG. 5 is a horizontal section on the plane 5--5 of FIG. 4.
FIG. 6 is a perspective view, on an enlarged scale, showing one of
the removable support platforms.
DESCRIPTION OF THE PREFERRED EMBODIMENT
The heating container generally indicated at 10 in FIG. 1 is
defined by the outer tank 11 and the inner tank 12. The sidewalls
13-16 and the bottom 17 of the outer tank are spaced from the
sidewalls 18-21 and the bottom 22 of the inner tank to provide a
water-jacket space. An electrical heating element 23 is installed
in the space between the bottoms of the inner and outer tanks, and
is secured to the front wall 16 of the outer tank as shown in FIG.
5. Conventional wiring generally indicated at 24 electrically
associates the heating element 23 with the off-on control switch
25, and with the conventional thermostat 26. These components are
supplied with electrical energy by the cable 27, the wire 28 being
a conventional grounding arrangement for eliminating the
possibility of the accumulation of an electrical charge on the
metal of which the container is preferably constructed. The
drainage valve 29 is connected through a suitable conduit 30 to the
drain port 31 in the interior tank 12, and the drain valve 32 is
installed at a position to drain the jacket space between the inner
and outer tank. It is preferable that the outer tank walls 16 be
offset to provide a recess 33 extending across the lower front of
the device to receive the electrical and drain components referred
to above, this recess being covered by the angle plates 34 and 35
secured by screws entering the holes 36-39 and the tapped holes
40-43 on the body portion of the container. A light 44 may be
incorporated in the switch 25 to indicate the "on" condition of the
device. In view of the elevated temperature of the unit generated
by the heater 23, it is preferable to raise the device off the
surface of a supporting counter by the provision of legs as shown
at 45-48.
Referring particularly to FIGS. 3 and 4, the upper surface of the
device is defined by the peaked configuration provided by the
slanted surfaces 49-50 forming the top closure for the water-jacket
at the front of the machine, and the similarly slanted surfaces 51
and 52 forming the closure of the water-jacket at the rear of the
device. The doors 53 and 54 are hinged to the container,
respectively, at 55 and 56. The point of hinge connection of the
door to the container is preferably at or adjacent the lower
extremity of the doors. Marginal portions of the doors overlap the
surfaces 49-52, and the upper extremities of the doors come
together at the portions 57 and 58 to form a fairly close seal
against the escape of water vapors. These portions of the device
are preferably shaped as indicated in FIGS. 1 and 4 to provide the
reverse-bent sections 59 and 60 which function as handles to
facilitate the opening of the doors. The chains 61 and 62 limit the
opening movement of the doors, as shown in FIG. 3.
Since the doors are not provided with jacketing, the temperature of
the doors is inevitably less than the condensation temperature of
the water vapor within the interior of the device. The formation of
droplets of condensation on the slanted surfaces defined by the
doors 53 and 54 will therefore move outwardly from the center, and
will eventually move or drop into the troughs 63 and 64. The trough
64 will deliver accumulated condensation to the water-jacket space
through the opening 65 in the inner container wall 19. This opening
is above the normal level of the water indicated at 66 within the
jacket space. The provision of the hole 65 therefore does not
destroy the isolation of the water 67 at the bottom of the inner
container. An alternative form of drainage is shown at the right
portion of FIG. 5, in which the trough 63 drains through the
plastic tube 68 into the accumulation of water 67 at the bottom of
the inner container. The latter arrangement for handling condensate
does not alter the balance of water between the inner container and
the water-jacket, and is therefore preferable. The tube 68 is
removable, to facilitate cleaning.
The platform panels 69 and 70, shown in detail in FIG. 6, are
essentially bent pieces of perforate metal. Openings as shown at 71
and 72 are preferably incorporated as hand-holes to make it more
convenient to place and remove these panels. Hamburg and hot dog
buns, as shown respectively, at 74 and 75 in FIG. 4 can be
supported on these platforms above the level of the water 67, and
outside of any areas where there is a possibility of falling
accumulation of condensate. If desired, the entire unit may be
moved from place to place, with or without the contents shown in
FIG. 4, through the use of projections as 76 and 77 at the upper
exterior edges adjacent the hinges. The spout 78 provides a
fill-point for the jacket space between the inner and outer
containers, and is preferably covered by a hinged flap 79.
* * * * *