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Патент USA US3043954

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July 10, 1962
1.. c. HANSON
3,043,944
HEATING UNIT
Filed June 10, 1959
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July 10, 1962
L. c. HANSON
3,043,944
HEATING UNIT
Filed June 10, 1959
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United States Patent 0 f"1C@
1
3,043,944
HEATING UNIT
Leroy C. Hanson, Elmhurst, Ill., assignor to Form ,
Corporation, a corporation of Ohio
Filed June 10, 1952, Ser. No. 819,310
12 Claims. (Cl. 219-37)
3,043,944
Patented July 10, 1962
2
bodiment, with the understanding that the present dis
closure is to be considered as an exempli?cation of the
principles of the invention and is not intended to limit
the invention to the embodiment illustrated. The scope
of the invention will be pointed out in the appended
claims.
This invention relates to a heating unit and more
Referring now to the drawings there is shown a heat
ing unit' 10 including a pan 11 having a central dished
particularly to a heating unit particularly adapted for
portion 12 and an outer lip portion 13 terminating in
use in a counter-top type of electric stove.
10 an outer circular edge 14. A heating coil 15 is secured
It is the general object of the present invention to
(\by means not shown) to a three legged carrier or
produce a new and improved heating unit of the char
bracket 16 lying within the dished portion 12 and re
acter described.
movably supported in place therein ‘by engagement of
It is a more speci?c object of the invention to pro
the ends 17 of the arms of carrier 16 on supporting
duce a heating unit including a spillage pan having an 15 surfaces 18 inwardly indented in the wall 12a of the
Outer lip adapted to be supported by the edges of an
pan. As will appear more fully below, a ?nger 17a
opening in the counter, wherein the terminal block for
at the end of one of the support arms .16 locks under
the electrical connections of the unit is secured on the
a detent 18a above one of the supporting surfaces 18
pan below the lip portion so that the same may be
(-FIGURE 4).
mounted in a minimum space both as regards width and 20
Spillage pan 12 is mounted in an opening 19 in a
depth.
suitable counter-like cooking surface 20, as of stainless
Another object of the invention is to produce a heat
or enameled steel. Spring clips 21 secured to the outer
ing unit of the character described in the preceding para
surface of spillage pan 12 hold the pan heating unit in
graph wherein the terminal blook is secured to a thin
place, yet permit removal as may be necessary, for clean
sheet-like bracket which is welded to the outer surface 25 ing or the like.
'
of the spillage pan and has a portion spaced from said
The ends 22 and 23 of heating coil 15 extend through
surface de?ning an insulating air space above the ter
a metal plate 24, which serves as a grease guard and ter
minal block.
rninate in male contact portions 25 and 26. The male
A further object of the invention is the provision of
contacts are separably engageable‘with female contacts
, a heating unit including va spillage pan having a wall
carried by terminal block 27, for energization of the
with a terminal block mounted against the wall and hav
heating element.
ing terminal guide portions extending through the wall
Terminal block 27, which may be of Bakelite or other
for receiving the terminals of a heating element and
heat resistant insulating material, is arranged according
guiding them into contact with terminals carried by the
to the present invention to lie beneath lip portion 13 of
35 the spillage pan 12 and preferably substantially com
terminal block.
Yet‘another object of the invention is the provision of
pletely within the con?nes of the outer edge 14 so that
‘a heating unit in which a coil heating element is mounted
the unit may easily be inserted in ‘counter opening 15)
on a carrier which has a locking portion engageable with
of minimum size. Terminal block 27 has mounted there
a surface of the spillage pan, the carrier being resiliently
in a pair of springy vfemale terminals 28 and 29 which
held in place as by forces exerted by resilient female 40 are accessible through openings 30 and 31 formed in
terminals and the resilient coils of the heating element.
a portion 32 of the terminal block which extends through
Still a further object is the provision of cooperating
an opening‘ 34 formed in the wall 12a of the pan. If
guide surfaces on the coil assembly and terminal block
desired, blade-type contacts with wiping female terminals
~ for limiting and directing the movement of the coil ter
may be substituted for the terminals shown in the draw
minals into engagement with the terminals in the terminal 45 ing.
block. More speci?cally, a ?nger on the coil assembly
Terminal block 27 is preferably mounted against the
extends into a recess in the terminal block and surfaces
I at the top and bottom of the recess limit the move
ment of and guide the coil assembly upon its insertion
and removal.
One of the guide surfaces serves as a
ground connection for the coil assembly.
Other and further objects and advantages of the inven
tion will be readily apparent from the following descrip
tion and drawings, in which:
FIGURE 1 is a top plan view of a heating unit en -
bodying the invention;
FIGURE 2. is a side elevational view of the apparatus
outer surface of the wall of thepan on a bracket 36
spot welded to the pan and to the undersurface of lip
portion 13 in a manner providing a space 37 between the
confronting surfaces of the bracket and the lip portion
as indicated in FIGURES 4 and 7. The terminal block
is secured to the bracket 36 by screws 38 which extend
through the bracket and terminate in a space 34, thus
avoiding any discontinuity or holes in the lip portion and
securely mounting the terminal block in the desired posi
tion. The air space between bracket 36 and lip 13 acts
as an insulator and prevents excessive radiation of heat
‘from the element 15 to terminal block 27. Of course,
shown in FIGURE 1;
FIGURE 3 is a vertical section taken along the line
other mounting arrangements may ‘be utilized, as by
60 screwing the terminal block directly to the wall of the
3-3 of FIGURE 1;
FIGURE 4 is a vertical section taken along the line
4—4 of FIGURE 1;
FIGURE‘ 5 is an enlarged vertical section taken along
the line 5-5 of FIGURE 4;
pan.
A pair of binding screws 39‘ and 40 are provided for
the female terminals 28 and 29, respectively, and face
outwardly of the terminal block facilitating connection
FIGURE 6 is an enlarged horizontal section taken 65 with a suitable source of electricity. These connections
may be made after the unit is installed in a cooking sur
FIGURE 7 is a vertical section taken along line 7—7
face, if the under portion of the surface is relatively
of FIGURE 6.
open, or may be made before installation of the unit
While this invention is susceptible of embodiments
Where the underside of the cooking surface is enclosed.
in many ditferent forms, there is shown in the drawings 70 Terminal guide openings 30 and 31 in block 27 are
and will herein be described in detail one speci?c em—
larger than male coil terminals 25 and 26 so that the
along line 6~6 of ‘FIGURE 4; and
3,043,944
4%
said trim ring, said plate element terminating inside the
terminals have a loose ?t therein. A guide ?nger 42
lateral extent of the trim ring and spaced from said trim
extends outwardly from grease guard 24, between male
ring to define an insulating air space above the terminal
terminals 25 and 26. A recess 43 is provided in terminal
block, a pair of female contact portions on the terminal
block 27 to receive ?nger 4?. and,‘ to guide the movement
of male terminals 25 and 26 upon insertion and removal. CR block, and a heating coil positioned within the pan and
provided with male contact portions engaged with said
A pair of guide surfaces 44 and 4-5 are provided above
female contact portions.
and below recess 43 to aid in guiding movement of the
3. A heating unit for a counter-top type stove, com
coil assembly. Both guide surfaces preferably have
prising a spillage pan having a wall portion with a trim
curved end portions to facilitate insertion of guide ?nger
42, and the surface M- is formed as a part of the wall of 10 ring extending outwardly from the upper edge thereof,
a terminal block mounted substantially directly beneath
spillage pan 12. The lower guide surface 45‘ has an
the lateral extent of the ring and substantially above
extension 45a secured to terminal block 27 and provided
the lower extent of the pan and against said wall portion
with a binding screw 46. Surface 45 engages the lower
edge of guide ?nger 42 when the unit is fully inserted
and having terminal guide portions extending through
and serves to ground the heating unit through a suitable 15 said Wall, a pair of female contact portions carried on
said terminal block and operably associated with said
grounded connection to binding screw 4:6.
Latching ?nger 17a on coil support 16 is held in en
guide portions, and a heating coil positioned within the
pan and provided with male contact portions engaged
gagement with latching detent 1351 by a combination
with said female contact portions, said coil having a guard
of two forces. The ?rst force is provided by the resil
iency of female contacts 23 and 29 acting against the 20 plate mounted thereon adjacent the male contact por
tions and removably engaging only the inner surface of
ends of male contacts 25 and 26. The second force re
said pan adjacent said terminal guide portions to shield
sults from deformation of coiled heating element 15 upon
insertion of the heating element assembly into spill pan
the contact portions from spillage.
4. A heating unit for a counter-top type stove, com
12.
The heating element may be removed from the pan 25 prising a spillage pan having a wall portion with a trim
by forcing the carrier in to the right as shown in FIG
ring extending outwardly from the upper edge thereof,
said wall portion having .a downwardly facing locking
URE 4, against the resiliency of the female contacts and
the coil itself, releasing locking portion 17a from detent
surface projecting inwardly therefrom, a terminal block
18a. The left portion of the assembly is lifted, rocking
mounted outside said pan at a location opposite to said
male contacts 25 and 26 in oversize openings 35) and 31 30 locking surface, resilient female terminals on said block
to a position in which the carrier may be moved to the
and accessible through the wall of said pan, an electrical
left over the top of ring 13. The unit may then be
heating element of resilient material formed in a coil
lifted out freeing the male contacts from the terminal
having male terminals engaged with said female ter
minals and said block, and a carrier having a lock por
block.
The bottom 50 of pan 11 is provided with an outer
tion for engagement with said locking surface and hav
ing extensions extending transversely to a line between
bottom element 51, spaced therefrom and secured there
The double-bottom
said block and said locking surface, said heating element
construction provides insulation preventing excessive heat
radiation downwardly below the spillage pan and adds
strength and rigidity to the unit. The reduction in
downward heat radiation permits installation of the unit
being secured over and to said carrier to enable forces
exerted on said male terminals by the block and said
resilient female terminals to urge the lock portion against
in a cooking surface which has only a shallow space be
low it, as excessive heating of the space beneath is pre
5. A heating unit for a counter-top type stove, com
prising a spillage pan having a wall portion with a trim
to at a central region 52 as shown.
the locking surface.
vented. Furthermore, the ?xed mounting of the terminal
ring extending outwardly from the upper edge thereof,
block on the wall of the pan and, for the most part, be 45 said wall portion having a. downwardly facing locking sur
neath trim ring 143 permits installation of the unit in a
face projecting inwardly therefrom, a terminal block
space much smaller than that required by most such
mounted outside said pan at a location opposite to said
units.
locking surface and havin" terminal neck portions extend
I claim:
ing through said wall portion, resilient female terminals
1. A heating unit for a counter-top type stove com
on said block and accessible through said neck portions,
prising a spillage pan having a central dished portion
an electrical heating element disposed above said neck
and an outer lip portion terminating in an outer circular
portions and having male terminals engaged with said fe
edge, a thin sheet-like bracket entirely within the con
male terminals and said neck portions, and a carrier hav
?nes of said lip and the adjacent outer surface of the
ing a lock portion for engagement with said locking sur
dished portion, said bracket being secured at its edges
to the outside surface of the dished portion beneath the
lip portion with an intermediate portion of the bracket
bridging across the under surface of the lip portion to
face and having extensions extending transversely of a
line between said block and locking surface, said heating
element being secured over and to said carrier to enable
forces exerted on said male terminals by the neck portions
to resiliently bend the coil slightly across the carrier ex
provide an air space between said pan and bracket, a
terminal block mounted on said bracket lying substan 60 tensions to bring the lock portion against the locking
tially directly beneath the lateral extent of the lip and
surface.
substantially above the lower extent of the pan secured
6. A heating unit for a counter-top type stove, com
to the bracket by securing means extending through the
prising a spillage pan having a wall portion with a trim
bracket and terminating in said space, a pair of female
ring extending outwardly from the upper edge thereof,
contact portions on the terminal block, and a heating
said wall portion having a downwardly facing locking
coil positioned Within the pan and provided with male
surface projecting inwardly therefrom, a terminal block
contact portions located to be inserted in said female
mounted outside said pan at a location opposite said lock
contact portions.
ing surface resilient female terminals on said block and
2. A heating unit for a counter-top type stove, com~
accessible through said neck portion, an electrical heating
prising a spillage pan with a trim ring extending out 70 element being secured thereto and of resilient material
wardly and downwardly therefrom, a terminal block
formed in a coil having male terminals engaged with said
mounted on said pan lying substantially directly beneath
female terminals, .a carrier for said coil element having
the lateral extent of the ring and substantially above the
a lock portion engaged with said locking surface, the
lower extent of the pan, a plate element extending trans
carrier lock portion being held in place by force exerted
versely above the top of the terminal block and below 75 by the resilient terminals.
3,043,944
5
6
ing: a spillage pan, a terminal block mounted on said
said heating coil being secured to said support to enable
forces exerted on said coil ends by the terminal block
pan having female contact portions facing inwardly
and the resilient female contact portions to urge the
thereof and a guide recess formed therein, a heating coil
locking portion of said support into engagement with
said locking surface.
7. A heating unit for a counter-top type stove compris
positioned within the pan provided with-male contact
portions located to be inserted in the female contact por
tions of said block and having a guide ?nger extending
slightly outwardly beyond said male contact portions
12. ‘In a counter-top type stove, an electrical heating
unit adapted to be mounted on a stove plate of the counter
top in recessed position relative thereto, comprising: a
shallow pan having a continuous side wall adapted to ?t
tact portions into the female contact portions, and sur 10 closely within an aperture of said stove plate and a con
tinuous lip extending outwardly and downwardly from
faces adjacent said recess guiding the insertion and re
its upper edge to overlay the adjacent margin of the stove
moval of the guide ?nger.
plate and form an air pocket therebetween, said pan side
8. The heating unit of claim 7, wherein said surfaces
to enter- said recess prior to entrance of the male con
wall having spaced apart and horizontally aligned. sup
are at the top and bottom of said recess and are rounded.
9. A heating unit for a counter-top type stove com 15 porting surfaces projecting slightly inwardly from the in
ner surface thereof and a downwardly facing locking sur
prising a spillage pan, a terminal block mounted on said
pan having female contact portions facing inwardly
face above the supporting surface and projecting slightly
thereof and a guide recess formed therein, a heating coil
positioned within the pan provided with male contact
inwardly from the inner side of said pan sidewall; a
bracket adapted to fit within the con?nes of said lip and’
portions located to be inserted in the female contact
portions of said block and having a guide ?nger extend
adjacent said side wall to extend horizontally therealong,
said bracket bridging the underside of said lip and said
ing slightly outwardly beyond said male contact portions
sidewall to form a reduced air pocket thereabove and
along the extent of said bracket; a terminal block mounted
on said bracket and interrupting the margin of said stove
portions into the female portions, and surfaces adjacent
said recess for guiding the insertion and removal of the 25 plate located beneath said bracket, said terminal block
being positioned on the opposite side of said pan from the
guide ?nger, and a ground connection to one of said
locking surface and lying substantially directly beneath
surfaces.
the lateral extent of the lip and substantially above the
10. In a counter-top type stove, an electrical heating
lower extent of the pan, said block having spaced apart
unit adapted for recessed mounting within a stove plate of
said counter-top, comprising: a shallow pan having a 30 resilient female contact portions facing inwardly thereof
and a guide recess formed intermediate the female contact
continuous side wall adapted to ?t closely within an aper
portions, said block having terminal neck portions ex
ture of said stove plate and a continuous lip extending
to enter said recess prior to entrance of the male contact
outwardly and downwardly from the pan’s upper edge
tending through said side wall and having guide openings
to form an air pocket between said stove plate and pan;
to provide access to the said female contact portions; a
an elongated bracket within the con?nes of said lip and 35 heating coil of ?exible resilient material provided in the
pan having straight ends each with a male contact portion
for engaging said female contact portions and the neck
the underside of said lip and said side wall to form a
portions of said block, said coil having a plate mounted
reduced air pocket thereabove and along the extent of
adjacent said side wall, said bracket bridging between
said bracket; a terminal block mounted on said bracket
and interrupting the margin of said stove plate lying
beneath said bracket, said bracket lying substantially di
on said ends adapted to ?t the contour of the inner side
of said pan sidewall above and below the area through
whichsaid ends pass, said plate having a guide ?nger ex
rectly beneath the lateral extent of said lip; a pair of
tending slightly outwardly beyond said male contact por
female contact portions on the terminal block; and a
tions, to enter said recess prior to entrance of the male
heating coil positioned within the pan and provided with
male contact portions engaged with said female contact
portions.
11. An electrical heating unit as in claim 10, in which
said pan sidewall has spaced apart and horizontally aligned
supporting surfaces projecting slightly inwardly from the
inner surface thereof and a downwardly facing locking
surface above the supporting surfaces projecting inwardly
from the inner side of the pan, said terminal block being
mounted on said bracket at a position on the pan opposite
contact portions into said neck portions; guide surfaces
on said block and adjacent said recess to guide the inser
tion and removal of the guide ?nger; and a support for
said heating coils seated on said support surfaces of the
pan having extensions extending transversely to a line
between said block and said locking surface, said sup
port having a locking portion adapted to engage said
locking surface, said heating coil being secured to said
support to enable forces exerted on said coil ends by the
terminal block and the resilient female ‘contact portions to
urge the locking portion of said support into tight engage
to said locking surface, said block having resilient female
contact portions facing inwardly and neck portions ex 55 ment with said locking surface.
tending through said side wall with guide openings to
References Cited in the ?le of this patent
provide access to the female contact portions, said heat
ing coil being of a ?exible resilient material having
UNITED STATES PATENTS
straight ends each with a male contact portion for en
gaging both said female contact portions and the sides of 60
said neck portions and including a support for said heat
ing coil seated on said pan support surfaces having ex
tensions extending transversely to a line between said
block and said locking surface, said support having a
locking portion adapted to engage said locking surface, 65
2,414,667
Price _____ _'_ _________ .__ Jan. 21, 1947
2,565,443
2,790,062
Vogel et a1 ____________ __ Aug. 21, 1951
McOrlly ____________ _._ Apr. 23, 1957
2,923,802
Price _________________ __ Feb. 2, 1960
562,300
Canada ______________ _._ Aug. 26, 1958
FOREIGN PATENTS
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