U.S. patent number 3,681,568 [Application Number 05/208,429] was granted by the patent office on 1972-08-01 for electrically heated cooking appliance.
This patent grant is currently assigned to John Oster Manufacturing. Invention is credited to George H. Schaefer.
United States Patent |
3,681,568 |
Schaefer |
August 1, 1972 |
ELECTRICALLY HEATED COOKING APPLIANCE
Abstract
An electrically heated cooling appliance of the type having a
removable, probe-type, thermostatic temperature control device and
comprising a base having an upper surface to be heated and an
electric heater means on the underside of the base having terminal
ends protruding therefrom. Means integrally formed on the underside
of the base is provided to define only a portion of a temperature
sensing zone. The remainder of this zone wherein the probe is
received is defined by bracket means secured to the underside of
said base which bracket means also includes means supporting a pair
of terminal connectors for engagement with suitable connectors
defined on the removable probe-type temperature-responsive, control
device when the latter is applied by inserting the probe into the
temperature sensing zone.
Inventors: |
Schaefer; George H. (Wauwatosa,
WI) |
Assignee: |
John Oster Manufacturing
(Milwaukee, WI)
|
Family
ID: |
22774574 |
Appl.
No.: |
05/208,429 |
Filed: |
December 15, 1971 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
Issue Date |
|
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41239 |
May 28, 1970 |
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Current U.S.
Class: |
219/432; 99/325;
219/252; 219/433; 219/441; 219/448.17; 219/459.1; 99/447; 219/430;
219/435; 219/436; 219/521 |
Current CPC
Class: |
A47J
37/1266 (20130101); A47J 27/004 (20130101); A47J
37/1209 (20130101) |
Current International
Class: |
A47J
37/12 (20060101); A47J 27/00 (20060101); F27d
011/02 () |
Field of
Search: |
;99/422,447,325,326
;219/250-252,429,430,432-436,438,439,441,521,448-459
;337/372,381 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
Primary Examiner: Mayewsky; Volodymyr Y.
Parent Case Text
This is a continuation of application Ser. No. 41,239, filed May
28, 1970 now abandoned.
Claims
What is claimed as new and desired to be secured by Letters Patent
of the
1. An electrically heated cooking appliance comprising a heating
tray having a flat circular bottom portion and an upwardly curved
peripheral side wall extending only a short distance above said
flat bottom portion, said heating tray being formed of a good heat
conducting material, an electrical heating element in intimate heat
exchange relationship with said heating tray, a removable vessel
having a side wall of an extent to define a container having a
depth several times greater than the depth of said heating tray,
said removable vessel having a bottom and a small section of the
lower portion of the side wall of said vessel contoured to fit in
good heat conducting relationship within said heating tray, said
vessel having a circular flat bottom in heat exchange engagement
with said bottom portion and a portion of the side wall of said
vessel being in heat exchange relationship with said curved
peripheral side wall, a temperature sensing control device
positioned closely adjacent to said heating tray and responsive to
the temperature of said heating tray for connecting said heating
element to an electrical power source and for maintaining said
heating tray at a constant preselected temperature, and an
insulating support tray of shallow pan-like configuration mounted
in spaced relationship with said heating tray to provide an annular
passageway between the adjacent open tops of said heating tray and
said support tray, and fastening means for securing said trays in
said spaced relationship.
2. The cooking appliance of claim 1 wherein the side wall of said
removable vessel is tapered inwardly toward the top thereof to
prevent spillage or
3. The cooking appliance of claim 1 wherein a ventilating opening
is provided in said insulating support tray to permit the flow of
air through
4. An electrically heated cooking appliance comprising a heating
tray having a flat circular bottom portion and an upwardly curved
peripheral side wall, said tray being formed of a good heat
conducting material and having an electrical heating element
secured to the underside of said bottom portion, a removable vessel
having bottom and side walls contoured to fit into good heat
conducting relation to said tray, said vessel having a circular
flat bottom in engagement with said bottom portion and curved side
walls which are positioned in closely spaced relation to said tray
side walls, said tray including a pair of parallel downwardly
depending side walls integrally formed on the bottom thereof
defining a temperature sensing zone therebetween, closing means
extending across the ends of said depending side walls to enclose
all but the ends of said temperature sensing zone, a detachable
temperature sensing and control device for connecting said heating
element to an electrical power source, said sensing and control
device being positioned in good heat transfer relation with the
bottom of said tray and extending into said zone between said
5. The appliance of claim 4 wherein said vessel is formed with
inwardly sloping walls to provide a top opening which is smaller in
diameter than
6. The appliance of claim 4 wherein said tray is provided with an
insulating supporting base detachably secured to the underside of
said tray, said base having legs for supporting said appliance on a
horizontal surface, said base shielding said surface from radiation
from said element
7. An electrically heated cooking appliance comprising means
defining a heating surface, an electrical heating element in heat
exchange relationship with said first mentioned means, downwardly
depending wall means integrally formed with said first mentioned
means including a pair of spaced parallel walls defining a
temperature sensing zone therebetween and including lower edges, a
bracket including a wall portion secured to said first mentioned
means and engaging said lower edges of said parallel walls remote
from said first mentioned means further to enclose said temperature
sensing zone thereby defining an elongated tubular passageway
between said walls and above said wall portion of said bracket, a
pair of terminal connectors supported by said bracket in spaced
parallel relationship with the longitudinal axis of said
passageway, means for electrically connecting said heating element
to said terminal connectors, and a probe type removable temperature
responsive control means having a projecting probe receivable in
said passageway and terminals engageable with said terminal
connectors when said probe is within said temperature
8. The appliance of claim 7 including insulating support means for
said means defining a heating surface including an outwardly
opening cavity defined thereby for removably receiving said probe
type control means, said cavity having an apertured inside wall
providing access to said
9. The appliance of claim 7 wherein an insulating support is
secured to said means defining a heating surface, securing means
for fastening said first mentioned means and said insulating
support together effectively to provide a unitary structure, said
securing means permitting ready disassembly of said first mentioned
means and said base structure, whereby upon removal of said control
means the parts of said appliance may readily
10. An electrically heated cooking appliance comprising a heating
tray having a flat circular bottom portion and an upwardly curved
peripheral side wall extending only a short distance above said
flat bottom portion, said heating tray being formed of a good heat
conducting material, an electrical heating element in intimate heat
exchange relationship with said heating tray, a removable vessel
having a side wall tapering inwardly to prevent spillage or
splashing of liquid placed in said vessel, the side wall of said
vessel being of such extent as to define a container having a depth
several times greater than the depth of said heating tray, said
removable vessel having a bottom and a small section of the lower
portion of the side wall of said vessel contoured to fit in good
heat conducting relationship within said heating tray, said vessel
having a circular flat bottom in heat exchange engagement with said
bottom portion and a portion of the side wall of said vessel being
in heat exchange relationship with said curved peripheral side
wall, a temperature sensing control device positioned closely
adjacent to said heating tray and responsive to the temperature of
said heating tray for connecting said heating element to an
electrical power source and for maintaining said heating tray at a
constant preselected temperature, and an insulating support tray of
shallow pan-like configuration mounted in spaced relationship with
said heating tray to provide an annular passageway between the
adjacent open tops of said heating tray and said support tray, and
securing means including a single threaded fastening means for
securing said trays in
11. The cooking appliance of claim 10 wherein first cooperating
support means projecting from the bottom of said heating tray and
second cooperating support means projecting from said insulating
support tray maintain a predetermined spaced relationship between
said trays to define said annular passageway.
Description
The present invention relates to a new and improved electrically
heated cooking appliance of the type having a removable,
temperature-responsive, probe-type control device for controlling
the electric current supplied to heater means in the appliance
base.
In recent years, fondue pots have become increasingly popular
cooking devices, and in this type of appliance it is desirable to
have an extremely accurate temperature control so that the cooking
oil or sauce or other material in the fondue pot does not become
overheated and burn or spatter out or boil over onto the table
surface, yet remains high enough in temperature to properly cook
the food.
Another problem encountered with fondue pots is the fact that the
quantity of oil, sauce, foods, or the like, initially present in
the pot before the meal commences gradually decreases as the meal
proceeds, and a natural tendency to overheat the remaining smaller
volume of oil, sauce or the like, during the latter stages of the
meal must be prevented.
Another difficulty encountered with fondue pot cookery is that the
heating load is continuously changed as fresh, relatively cold
items to be cooked are deposited in the oil or sauce and cooked,
and relatively hot items are removed from the boiling oil, sauce or
the like on a random basis.
Accordingly, temperature control of the cooking medium in a fondue
pot should be capable of reacting rapidly to wide ranges and
changes of heat load in order to prevent overcooling or overheating
of the oil or material in the pot. An electrically heated fondue
pot with accurate temperature control offers many advantages over
prior fondue pots using an open flame as a heat source.
It is therefore an object of the present invention to provide a new
and improved thermostatically controlled electrical cooking
appliance of the character described which is capable of overcoming
the aforementioned difficulties and problems of prior art open
flame heated devices.
Another object of the present invention is to provide a new and
improved electrically heated cooking appliance.
Still another object of the present invention resides in the
provision of a new and improved electrically heated cooking
appliance which is capable of maintaining a relatively constant
temperature of a quantity of cooking medium or food even though the
cooking conditions vary widely and at random. In this connection
the fondue pot may be used for boiling water as well as heating
oils, sauces, cheeses and other cooking media.
A further object of the present invention is to provide a new and
improved electrically heated fondue pot especially adapted for
conveniently cooking food at the table.
Another object of the present invention is to provide a new and
improved electrically heated appliance of the character described
employing improved temperature control means in order to prevent
overcooling or overheating of the cooking fluid or the like.
Another object of the present invention is to provide a new and
improved electrically heated cooking appliance having novel means
for effectively maintaining a desired cooking temperature level
with minimized temperature variation even though cold objects are
added and hot objects removed on a random basis as the cooking
proceeds.
Still another object of the present invention is to provide a new
and improved electrically heated cooking appliance of the character
described which is simple in construction, light in weight, neat in
appearance, easy to clean, and which lends itself readily to
manufacture on a mass production basis.
The foregoing and other objects and advantages of the present
invention are accomplished in a new and improved electrically
heating cooking appliance including a base assembly having an upper
surface heated and maintained at a selected temperature level. The
base assembly includes a heating tray portion formed with
electrical heater means on the underside, preferably cast into or
embedded in the base, and terminal ends of the electric heater
protrude outwardly of the base structure at spaced apart locations.
Wall means are integrally formed on the underside of the heating
tray portion defining only a portion of a temperature probe
receiving passageway which is open at least at the end adjacent the
periphery of the base. A bracket is secured to the wall means to
complete the probe receiving passage and thereby to define a
temperature sensing zone. The bracket includes an integral support
flange which extends transversely of the passageway. A pair of
terminal pins are supported on the flange and are electrically
connected to the terminal ends of the heater which are spaced on
opposite sides of the passageway with the longitudinal axes of the
terminal pins and the passageway arranged in spaced parallel
relationship. A removable, temperature-responsive, probe-type
control device is provided for controlling electrical current
supplied to the heater means in order to maintain a selected upper
surface temperature of the base. The control device includes an
elongated temperature-sensitive probe which is insertable into the
passageway defined partly by means integral with the base and
partly by the bracket. The probe transfers heat from the
temperature sensing zone to a thermostatically controlled switch
means which opens and closes in response to the temperature sensed
by the probe to energize and de-energize the heater means.
Further objects and advantages of the present invention will become
apparent as the following description proceeds and the features of
novelty which characterize the invention will be pointed out with
particularity in the claims annexed to and forming a part of this
specification.
For a better understanding of the present invention, reference may
be had to the accompanying drawings, in which:
FIG. 1 is a front perspective view of an electrically heated fondue
pot constructed in accordance with the present invention with the
removable probe in temperature controlling position;
FIG. 2 is a vertical, sectional view taken substantially along line
2--2 of FIG. 1 with the removable probe shown in phantom;
FIG. 3 is a fragmentary, front elevational view looking in the
direction of the arrows 3--3 of FIG. 2;
FIG. 4 is a plan view of the underside of the heating tray portion
of the fondue pot before assembly of the bracket therewith;
FIG. 5 is an enlarged fragmentary view of the portion of the
underside of the heating tray portion adjacent the area where the
temperature sensing zone is defined, but unlike FIG. 4 has the
bracket assembled therewith to complete the temperature sensing
zone and permit association therewith of a removable probe-type
thermostatic control device;
FIG. 6 is a fragmentary front elevational view looking
substantially in the direction of the arrows 6--6 of FIG. 5;
FIG. 7 is an exploded view in vertical section of the fondue pot
with the removable kettle not sectioned;
FIG. 8 is an enlarged fragmentary sectional view through the
removable temperature responsive control device of the fondue pot
taken substantially along line 8--8 of FIG. 2 assuming FIG. 2 shows
the complete structure; and
FIG. 9 is an enlarged, fragmentary, horizontal sectional view taken
substantially along line 9--9 of FIG. 8 assuming that FIG. 8 shows
the complete structure.
Referring now more particularly to the drawings, there is
illustrated a new and improved electrically heated cooking
appliance comprising a fondue pot generally indicated at 10 and
constructed in accordance with the features of the present
invention. The fondue pot 10 essentially comprises a separate
removable cooking vessel or kettle 11 for holding the quantity of
cooking fluid, such as oil, water, sauce, etc., or foods, such as
cheeses, chocolate, etc., in which food items are cooked, a
supporting base assembly 12 for the removable kettle 11, and a
removable thermostatic probe-type temperature responsive control
device 13 for regulating and controlling the heating of a portion
of the base assembly 12 as described in detail hereinafter.
The kettle 11, which is an open top kettle, is adapted to contain a
relatively large quantity of cooking medium, usually oil of some
sort, and includes a flat circular bottom 11a and an annular,
upstanding sidewall 11b which tapers inwardly towards the open top
to help prevent the spillage or splashing of hot cooking media or
foods outside of the kettle as food items are introduced or taken
from the kettle. Preferably the kettle 11 is formed of a good
conductor of heat, such as aluminum, and may have the interior
thereof coated with a suitable coating to simplify cleaning
thereof. The kettle 11 is provided with a lifting handle 14 so that
the vessel and its contents may be easily lifted from the support
base structure 12 when desired. In accordance with the present
invention, several kettles 11 may be employed with one supporting
base assembly 12 and control device 13. For example, a cheese
fondue may be heated and served in a first kettle 11 as an
appetizer. Then a second kettle 11 may be used for a meat fondue as
the main course and finally a third kettle 11 may be used for a
dessert fondue. Thus one heating device may be used for several
courses of a meal using a plurality of kettles 11.
The assembly 12 of the present invention includes a heated shallow
panlike heating tray 15 and insulating supporting means 16 and 17,
respectively. The tray 15 is illustrated as having a flat circular
bottom 15a, and an upwardly curved or dished peripheral sidewall
15b. The tray is preferably cast from a metal of good heat
conductivity. The upper edge of the curved sidewall 15b is
terminated in a horizontally outwardly extending upper flange or
rim 15c. The lower portion of the kettle 11 and the tray 15 are
dimensioned and shaped to accommodate one another so that good
conductive heat transfer between the upper surface of the bottom
15a of tray 15 and the lower surface of the bottom 11a of the
kettle 11 is established when the vessel is in cooking position, as
best shown in FIGS. 1 and 2 of the drawings. The close intimate
heat engaging contact between portions 11a and 15a is clearly
illustrated in FIG. 2 of the drawings. A slight amount of clearance
is provided between the upwardly curved sidewall portion 15b of the
tray 15 and the adjacent wall portion 11b of the kettle 11 to
provide for differences in thermal expansion and still permit easy
placement or removal of the kettle 11 relative to the tray 15. It
is important that the tray 15 has a contour conforming to that of
one or more removable kettles 11 to provide for maximum heat
transfer.
For the purpose of heating the tray 15, an electrical heating
element 18 of the conventional sheathed type is provided. As
illustrated best in FIG. 4 of the drawings this heating element 18
is of C-shape and, is illustrated as being cast into or embedded in
the metal defining tray 15 and within a downwardly projecting rib
structure 15d. Specifically the heating element 18 includes a
resistance heater wire 19 coaxially aligned within an outer tubular
sheath 20 and electrically insulated therefrom by a conventional
filler material preferably comprising compacted magnesium oxide
granules 21 (FIGS. 2 and 8) which have good heat transfer
capability. As best shown in FIGS. 4, 5 and 8 of the drawings, the
C-shaped heating element 18 terminates in downwardly projecting
terminal portions 19a and 19b.
In order to define a temperature sensing zone for the probe of the
removable probe-type control 13, the heated tray 15 is provided on
its underside with an integrally formed downwardly projecting wall
structure including two spaced parallel walls 15e and 15f which are
joined at the under surface of the tray 15 by a curved surface 15g.
The space between the walls 15e and 15f and bounded by said curved
surface defines a probe receiving passageway 22 open at the bottom
and open at each end. The open bottom is adapted to be closed, as
described hereinafter, and when closed there is defined the tubular
passageway 22 comprising a temperature sensing zone. The wall
structure comprising walls 15e and 15f includes integral
projections best shown in FIG. 4 of the drawings having tapped
openings 23 therein to accommodate fastening means described
hereinafter. The longitudinal axis of the passageway 22 bisect the
space between terminals 19a and 19b and the probe entrance opening
to the passageway 22 is adjacent the periphery of tray 15.
It will be appreciated that the tray 15 described above can be
manufactured at a substantially lower cost than similar heating
devices by virtue of the downwardly directed terminal portions 19a
and 19b and the passageway 22 open at the bottom. No side coring
for the mold would be required thus reducing tooling costs and
machining operations are not required with respect to the means
defining the temperature sensing zone.
To aid in firmly securing the heated tray 15 to the insulating
supporting means 16 and 17 the former is provided with an integral
downwardly projecting centrally located tubular member 15h which is
internally threaded for a purpose described in greater detail
hereinafter. In addition a plurality of depending projections 15j
are provided on the underside of tray 15 (FIG. 4) for further
securing the tray 15 and supporting means 16 and 17 together as the
support base structure 12.
For the purpose of completing the tubular passageway 22, defining
the temperature sensing zone there is provided a T-shaped bracket
24 defining both a combined terminal support member and closure
plate. The bracket 24 comprises a horizontal leg or closure plate
portion 24a defining the leg of the T and a vertically disposed
plate portion 24b defining the head of the T. The bracket 24 is
secured to the heated tray 15 by a plurality of fastening means
such as cap screws 25 threadedly engaged in the tapped openings 23
of the wall structure including walls 15e and 15f, thereby
completing the tubular passageway 22. The plate portion 24b
includes an integral forwardly projecting, stiffening lip or rib
24c, as best shown in FIGS. 5, 6 and 7 of the drawings.
As best shown in FIGS. 3, 6 and 9 of the drawings the flange 24b is
a terminal supporting flange and supports in electrically insulated
relationship a pair of spaced male type terminal pins 26, one
disposed on either side of the longitudinal axis of passageway 22.
These pins are adapted to make electrical connection in the
conventional manner with cooperating female type contacts
associated with the removable probe type unit 13. To support the
terminals in insulated relationship from bracket 24 and as best
shown in FIG. 9 of the drawings, the terminal pins 26 are provided
with threaded portions 26a intermediate the ends and an annular
flange or shoulder 26b adjacent a short inner end portion 26c
thereof. The threaded body portions 26a of the terminal pins
project through suitable apertures 27 formed in the plate portion
24b. The terminal pins are insulated from the plate portion 24b by
a plurality of insulating sleeves 28, and insulating washers 29 and
are positively clamped in place by locknuts 30 and washers 31.
It will be obvious that bracket 24 performs a dual function of
forming the bottom closure for the probe receiving passageway 22
and also supporting the male terminal pins 26. Moreover bracket 24
may be a low cost stamping which establishes the spacing between
terminal pins 26. With this arrangement the spacing between the
terminal pins 26 can be chosen as desired and accurate spacing is
assured. This eliminates the problems caused by casting stresses
requiring large tolerances in the spacing of the terminal pins
where they are mere extensions of the cast-in heating element as is
the conventional practice.
In order to complete the electrical circuit between the heating
element 18 and terminal pins 26 short jumper wires 32a and 32b are
provided. The jumper wire 32 preferably has one end spot welded to
heater terminal 19a and the other end similarly connected to one of
the terminals 26 as shown in FIGS. 5 and 8 of the drawings.
Similarly jumper wire 32b interconnects heater terminal 19b with
the other terminal 26.
Considering now the two part insulating supporting means 16 and 17,
each is formed of a suitable moldable material which is strong,
light in weight, and a good heat insulator as well as an electrical
insulator. The portion 16 might be characterized as an insulating
tray to substantially enclose heating tray 15 and associated parts
while the portion 17 might be characterized as a leg structure. The
reason for a two part supporting means is to simplify manufacture
and assembly operations and also to permit different moldable
materials to be used if desired. To insure stable support, the
portion 17 comprises three integral spaced legs 17a, each leg
having a rivetlike cushion foot 33 on the surface engaging end
thereof. The upper ends of the legs 17a join into a generally
circular body portion 17b having a centrally positioned,
upstanding, stepped diameter, hollow cylindrical sleeve 17c
projecting upwardly therefrom and designed to abut the lower end of
the tubular member 15a depending from heated tray 15 (FIG. 2). The
sleeve 17c has a passageway 34 therein terminating in a large
diameter lower end portion 34a. With this arrangement a suitable
fastening means such as screw 35 engaging the internally threaded
portion of tubular member 15h secures the leg structure 17 to the
heated tray 15. Removal of this single screw 35 permits ready
disassembly of the parts 16 and 17 for cleaning purposes if
desired.
The insulating tray 16 comprises a shallow panlike portion 16a
adapted to receive therein in spaced relationship the heating tray
15, as best shown in FIG. 2 of the drawings. Thus the depending
projections 15j of the heating tray 15 engage the insulating tray
16 to determine the spacing between trays 15 and 16. Depending from
the bottom of insulating tray 16 is an annular projection or ring
16b receivable in a cooperating annular groove 36 defined in the
circular body portion 17b of leg structure 17. The ring 16b and
groove 36 position the parts 16 and 17 in a predetermined
concentric relationship and they are secured together as a unitary
structure by screws 37 extending through openings 38 (FIG. 7) in
insulating tray 16 engageable with tapped openings 39 in the
central portion 17c of leg structure 17 (FIGS. 2 and 7).
Although the screw 35 will hold the leg structure 17 and the
insulating tray 16, secured thereto by screws 37, assembled to
heating tray 15, without more, relative rotation of the insulating
support means 16 and 17 and heating tray 15 could occur. To prevent
this the inside of pan portion 16a is provided with a cylindrical
recess 40 to accommodate therein a depending cylindrical projection
15k from heating tray 15 (FIGS. 2, 4 and 7). With this arrangement
the heating tray 15 and insulating support means 16 and 17 are
secured together for ready disassembly as if comprising an integral
structure. Moreover the insulating tray portion 16a fully encloses
the entire underside of the heating tray 15 thereby to protect the
user from inadvertent contact with the hot tray but also to protect
the surface upon which the fondue pot 10 is supported from radiant
as well as conductive heat.
For the purpose of ensuring that the insulating support means
remains relatively cool it is, of course, as clearly illustrated,
spaced from the heating tray 15. Furthermore, the circular base
portion 17b of the leg structure 17 is provided with ventilating
apertures 41 and the panlike portion 16a of the insulating tray 16
is provided with an enlarged central opening 42 (FIG. 7). Thus air
can freely circulate between the underside of the heating tray 15
and the insulating support means 16 and 17. In FIG. 2 the annular
space 43 between members 15 and 16 is clearly shown.
In order to define a suitable receptacle for the projecting
terminal pins 26 and to receive the removable probe unit 13, the
insulating tray 16 includes an integral boxlike portion 16c
adjacent where the terminal pins 26 are located thereby forming a
housing or enclosure around bracket 24. The projection 16c defines
an outwardly opening recess 44 of generally rectangular
configuration (FIG. 3) adapted to receive therein a portion of the
thermostatically controlled probe type device 13. As best shown in
FIGS. 7 and 8, the rear of recess 44 is defined by a wall 16d
having a central opening 45 therein in line with the probe
receiving passageway 22. In addition, the wall 16d is provided with
a pair of terminal pin receiving openings 46 on opposite sides of
the center opening 45 to accommodate the terminal pins 26 which
project outwardly from the bracket 24 into recess 44. The
rectangular recess 41 is dimensioned to removably receive therein
the probe-type temperature control device 13 in the conventional
manner. The details of the device 13 form no part of the present
invention but may be of conventional construction. As illustrated
in FIGS. 1 and 8 of the drawings it comprises a housing 48 having a
rear wall 48a from which projects the conventional probe 49
receivable within the temperature sensing zone defined by the
passageway 22 when the control device 13 is received in the recess
44.
Mounted within housing 48 are female type terminals 51 mounted in
spaced relationship and adapted to electrically engage the terminal
pins 26 in the manner indicated in FIGS. 8 and 9 of the drawings.
Suitable openings 52 are defined in rear wall 48a of housing 48
whereby terminal pins 26 may extend through these openings
electrically to engage the cooperating female terminals 51. A
suitable power cord 53 (FIG. 1) supplies power to female terminals
51 through a thermostatically controlled switch comprising contacts
54a and 54b (FIG. 8). An adjustable knob 55 is provided mounted on
the forward portion of housing 48 to permit the user to select a
desired temperature to be maintained for the liquid in kettle 11. A
typical probe-type control for the temperature-responsive control
device 13 is shown in U.S. Pat. No. 3,083,283. The
temperature-sensitive control device 13 is bodily removable from
the recess 44 and the probe 49 is movable along the longitudinal
axis thereof into and out of passageway 22 in the heating tray 15.
Simultaneously with this movement of probe 49 the electrical
circuit between terminal pins 26 and female type terminals 51 is
made or broken.
By employing the removable control the fondue pot can readily be
cleaned although submersion of the base assembly 12 is not normally
contemplated. Spills and spatters can be easily sponged off without
being concerned about the removable probe unit 13. Moreover the
base unit can readily be disassembled for a more thorough cleaning
by removal of a single screw 35.
While there has been shown and described a particular embodiment of
the present invention, it will be apparent to those skilled in the
art that various changes and modifications may be made without
departing from the invention in its broader aspects, and it is,
therefore, contemplated in the appended claims to cover all such
changes and modifications as fall within the true spirit and scope
of the present invention.
* * * * *