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Патент USA US3088032

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April 30, 1963
~ »
c. s. MERTLER ETAL
3,088,016
THERMO-SENSING UNIT
Filed March 2, 1960
3'Sheets-Shee’c 1
F/g- 2
CHARLES s. MERTLER
By RICHARD H. JORDAN
ATTOR N EYS
April 30, 1963
c. s. MERTLER ETAL
’
3,088,016
THERMO-SENSING UNIT
Filed March 2, 1960
3 Sheets-Sheet 2
Fig. 3
6'
44 4O
52
38
34
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Fig.4
INVENTORSL
CHARLES SpMERTLER
BY RICHARD H‘ JORDAN
W714? wet/m2:
ATTO R N EYS
April 30, 1963
c. s. MERTLER ETAL
3,088,015
THERMO-SENSING UNIT
'
Filed March 2, 1960
3 Sheets-Sheet 3
INVENTORS.
cu
By RIC
ES s. ME
RD H. JOR
ER
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ATTORNEYS
United States Patent 0
1
3,088,016
Patented Apr. 30, 1963
2
3,088,016
Still another object of the invention is to provide a
temperature sensing unit which is rigidly connected to a
surface heating unit to move therewith and with rigid elec
Charies S. Mertler and Richard H. Jordan, Mans?eld,
Ohio, assignors to Stevens Manufacturing Company,
trical connections ?xed relative to the surface unit, yet in
cluding ?exible electrical connections to the temperature
THERMO-SENSING UNIT
sensing means within the temperature sensing unit.
Still another object of the invention is to provide a
10 Claims. (Cl. 219-37)
temperature sensing unit with separable electrical con
nections utilizing standard parts and adaptable for use
The invention relates in general to temperature sensing
with currently available surface units.
units and more particularly to temperature sensing units 10
Other objects and a fuller understanding of the inven—
for use with ranges, such as household electric ranges, to
tion may be had by referring to the following description
sense the temperature of a vessel heated on the range in
and claims, taken in conjunction with the accompanying
order to control the heat imparted to the vessel.
drawings, in which:
The invention relates to a temperature sensing unit for
FIGURE 1 is a plan view of a surface unit incorporat
a vessel heated on a surface unit electrically connected at 15 ing therein a temperature sensing unit according to the
least partially by rigid connections to a range, with the
invention;
temperature sensing unit including a body engageable
FIGURE 2 is a sectional view on line 2-2 of FIG
with the surface unit by mounting means, heat responsive
Inc., a corporation of Ohio
Filed Mar. 2, 1960, Ser. No. 12,469
URE 1;
cap means on the upper end of the body and spring means
FIGURE 3 is a partial bottom view of the surface unit
urging the cap means upwardly above the level of the sur~ 20
of
FIGURE 1;
face unit to engage the underside of any vessel on the
FIGURE 4 is an enlarged sectional elevational view of
surface unit, two electrical connections to the heat re
the temperature sensing unit taken on line 4-4 of FIG
sponsive cap means and ?rst and second electrical conduc
URE
2;
tors ?xedly disposed at least at one point relative to the
FIGURE 5 is an enlarged partial bottom view of the
rigid connections of the surface unit, the inner ends of the
?rst and second conductors at least part of which are ?ex
ible to accommodate movements of the spring means are
connected to the electrical connections of the cap means,
and the ?rst and second conductors providing external
electrical connection to the heat responsive cap means.
Household ranges, such as electric ranges, have in re
cent years been provided with some form of control de
vice which senses the temperature of the vessel being
heated and uses this as a control for the heat input to the
temperature sensing unit; and
FIGURE 6 is a sectional view on line 6-—6 of FIGURE
4.
The ?gures of the drawing show generally a surface
heating unit 11 of a range having a range top 12 and this
surface heating unit 11 has been shown as an electrical
heating unit which is a tubular sheathed heater. This
tubular sheathed heater is wound generally in a spiral as
seen in FIGURE 1 and carried on a support bracket 13
to more rigidly connect together the turns of the spiral.
vessel. The normal con?guration for range surface units,
The support bracket 13, in turn, is carried on an outer
either gas or electric, is circular and, therefore, the open
rim 14 which rests on the range top 12. A drip pan 15
center of the surface heating units is a convenient place
is carried on the outer rim 14 beneath the heating unit
to locate the temperature sensing unit. Most household
11. This heating unit has ?rst and second rigid tubular
ranges have a drip pan underneath the surface unit to
connections 16 and 17 at the two ends of the spiral and
catch any foods spilled or boiled over, and since this drip 40 these tubular connections extend into a terminal block 18
pan needs occasional cleaning, the surface units have
which is ?xedly ‘attached to the range top 12. The termi
been made either partially or fully removable. The par
nal block 18 is a means to provide electrical connection to
tially removable surface units have been ones wherein
the heating unit either through partially ?exible but perm
the electrical connections thereto are made by ?exible but
\anent electrical connections or as shown in the ?gures,
permanent electrical connections and the removable units
through a separable connection including contacts 19
have had some form of terminal block with a separable
and 20, which are carried in the terminal block 18. As
electrical connection to the surface unit. In either case
shown in FIGURES 1 and 2 the internal heater within the
the surface unit may be lifted out of the way to clean the
sheathed tubular heating unit 11 makes abutting contact
drip pan.
with the contacts 19 and 20* when the surface heating unit
Accordingly, with either type of range surface unit it 50 11 is in its normal position on the range top 12. This is
is an object of the present invention to provide a tempera
effected by a mounting bracket 21 connected to the- tubular
ture sensing unit which is ?xedly fastened relative to the
connectors 16 and 17 engaging a latch plate 22. This
surface unit so that as the surface unit is moved out of
latch plate is ?xed relative to the terminal block 18.
the way for access to the drip pan, the temperature sensing 55
The temperature sensing unit 25 is adapted to be
unit is also moved directly with the surface unit for un
mounted generally on the central vertical axis 26 of the
obstructed access to the drip pan. This permits use of
surface heating unit 11. This temperature sensing unit
a drip pan without a center hole which prevents spillage.
25 includes a sheet metal body 27 which has an inverted
Another object of the invention is to provide a small
cup shape. An insulator base 28 may be made, for ex~
compact temperature sensing unit which is ?xedly at 60 ample from a ceramic material to withstand the heat from
tached to a range surface unit.
this heating unit 11 and the body 27 has tabs 29‘ bent to
Still another object of the invention is to provide a tem~
engage the base 28 to fasten the two together. Also this
perature sensing unit for a range surface unit which sens
body 27 has tabs 30 to engage apertures in the support
ing unit has ?exible connections to permit spring means
bracket 13 to ?xedly support the temperature sensing unit
to urge a part of the temperature sensing unit upwardly 65 25 relative to the heating unit 11.
into engagement with -a vessel heated by the surface unit.
A conical surface 34 is provided in the body 27 to de?ne
an upwardly directed aperture in this body. A sheet metal
Still another object of the invention is to provide a
top 35 has a downwardly sloping conical skirt 36 engage
temperature sensing unit for a completely separable sur
able with the aperture de?ning surface 34. A conical
face heating unit with the electrical connection to the
temperature sensing unit being made at a terminal block 70 compression spring 37 is disposed within the body 27 and
acts between the base 28 and the metal top 35 to urge this
which carries the separable electrical connections to the
top upwardly toward engagement with the aperture de
surface heating unit.
< 3,088,016
?ning surface 34. The top has a coaxial opening 38 to
receive the stem 39 of a metal cap '40‘. This cap is made
of a metal of good heat conductivity, such as aluminum,
and overlies the upper end of the metal top 36. The posi
tion of the entire temperature sensing unit 25 as deter
mined by the tabs 30 is such that the cap 40 lies above
the plane of the surface heating unit 11 as determined by
the urging of the spring 37 so that this metal cap 40 will
engage the underside of any vessel being heated on the
4
metallic tubes 63 and 64 and the body 27 are v?xed rel~
ative to the heating unit 11, the ?exible lead wires
55 and 56 are the only ?exible part of the entire elec
trical connection which is required in order to accom
modate the small vertical movement of the metal cap
40 and the metal top 35. This small vertical movement
?exes these lead wires 55 and 56 to a very small extent,
and accordingly, the entire device is quite simple and
reliable. The resistance wire 52 is subjected only to a
10 low voltage, for example, 6 to 12 volts may be all that
The stem 39 is provided with a shoulder 43 which en
is required on this resistance wire 52, and accordingly,
gages the metal top 35 to de?ne an annular wire space
only low voltage insulation need be provided thereon.
44 between the underside of this cap 40 and the upper
Glass
insulated wire is quite suitable since the glass in
surface of the metal top 35. An insulating washer 45,
for example, one made of mica, is provided against the 15 sulation is homogeneous and thin for good heat transfer
yet providing su?icient electrical insulation. The ?exible
underside of the metal top 35. An insulating eyelet sup
lead
wires 55 and 56 may be stranded for a greater
port washer 46 is also provided on the stem 39 and the
?exibility and may have a small loop therein, as shown
stem is headed at 47 to fasten together the cap 40, the
in FIGURE 4, to increase the ?exibility and eliminate
washers 45 and 46 and the metal top 35. First and
the
possibility of breakage upon continued ?exing.
second metal eyelets ‘48 and 49 are carried in the eyelet 20
surface unit.
support washer 46 and act as electrical terminals.
A resistance wire 52 is wound as a doubled wire in a
The resistance wire 52 is preferably wound as a dou~
bled coil in a pancake coil in a single axial thickness, as
best shown in FIGURE 6, in order to provide maximum
pancake coil in a single axial thickness in the annular
heat transfer to the wire from the metal cap 40. Also
wire space 44. This is as shown in FIGURE 6. This
resistance wire 52 has ?rst and second ends 53 and 54 25 the fact that this resistance wire 52 is wound as a dou
bled wire establishes that both ends 53 and 54 may be
which pass through apertures in the metal top 35 and
passed through apertures in the metal top 35 closely
insulating washer 45 to be disposed in the respective eye
adjacent the stem 39 which assures that every bit of the
lets 48 and 49. First and second ?exible wires 55 and
resistance
wire 52 is utilized. If this resistance wire 52
56 pass through apertures 57 and 58 in the base 28 and
enter the respective eyelets 48 and 49. Terminal pins 30 were wound as a single spiral, then it would have to
start near the stem and end in an aperture at the outer
59 and 60 are tfrictionally inserted into the eyelets 48
periphery
of this coil. Since the length of the resistance
and 49 to mechanically hold the resistance wire ends
wire determines the resistance and since the resistance
53 and 54 and the ?exible lead wires 55 and ‘56 in the
value is desired to be closely controlled, one could
eyelets and also to provide electrical interconnection.
not
be certain that this single spiral would fully utilize
First and second metallic tubes 63 and 64 have ?rst 35
all of the resistance wire in the annular wire space 44.
and second insulated conductors 65 and 66 therein, re
By wrapping this resistance wire as a double spiral one
spectively, and these metallic tubes 63 and 64 are
substantially rigid and are mounted substantially paral—
lel to and outboard of the rigid tubular connections
can make certain that a predetermined exact amount of
resistance wire will be disposed in the annular wire space
44 so as to accurately sense the temperature of the ves
16 and 17. This mounting is provided by the mounting 40 sel.
bracket 21 and by a second mounting bracket 67.
Although this invention has been described in its pre
This mounting bracket 67 also has a ?nger 68 estab
lishing the position of one side of the temperature
sensing unit 25. The inner ends of the ?rst and second
conductors 65 and 66 terminate substantially on a
ferred form with a certain degree of particularity, it
is understood that the disclosure of the preferred form
has been made only by way of example and that nu
merous changes in the details of construction and the
vertical plane containing the central axis 26. The ?exible
combination and arrangement of parts may be resorted
lead wires 55 and 56 extend downwardly through the
to without departing from the spirit and the scope of the
apertures 57 and 58 in the ‘base 28 and are penmanently
invention as hereinafter claimed.
connected to the ?rst and second conductors 65 and 66,
What is claimed is:
respectively. The ?rst and second conductors 65 and 50
1. A temperature sensing unit for a vessel heated on
66 extend into the terminal block 18 for separable con
a surface unit separately connected by rigid connections
nection with contacts 69 and 70. It will therefore be
to a range terminal block, said temperature sensing unit
seen that the terminal block 18 is a four-terminal block
comprising, in combination, a body having a surface de
which is a standard item‘ used with some surface units
which have two separate surface units 11. Accordingly, 55 ?ning an upwardly directed aperture, mounting means
this four-terminal block 18 provides a convenient means
for establishing separable electrical connection not only
to the surface heating unit 11, but also to the tempera
ture sensing unit 25.
on said body engageable with the surface unit to mount
said body ?xed relative to the surface unit, a top having
a downwardly sloping skirt within said body and engage
able with said aperture de?ning surface, heat responsive
The temperature sensing unit 25 is ?xedly mounted 60 cap means on the upper end of said top, spring means
within said body urging said cap means upwardly above
the level of the surface unit to engage the underside of
unit 11 is removed from the range top 12, the tempera
any vessel on the surface unit, a terminal support washer
ture sensing unit 25 is also removed at the same time.
disposed in said body, two terminals insulatively carried
The metallic tubes 63 and 64 are ?xed relative to the
relative to the surface heating unit 11 so that as this
rigid tubular connections 16 and 17 so that all electrical 65 in said support washer, two electrical connections on
said heat responsive cap means connected to said two
connections which enter the terminal block are rigidly
held together.
The compression spring 37 urge-s the metal cap up
wardly and this cap 40 together with the resistance
wire 52 may be considered to be temperature respon 70
sive cap means which is urged by the spring 37 into
terminals, ?rst and second conductors ?xedly disposed
parallel to and outboard of the rigid connections of the
surface unit, the inner ends of said ?rst and second con
ductors terminating generally centrally under said tem
perature sensing unit, ?exible lead wires interconnecting
said terminals and the inner ends of said ?rst and second
conductors, and said ?rst and second conductors pro
heating unit ‘11. As is best shown in FIGURE 2, the
viding for external electrical connection at the range ter
metal cap 40 is normally above the level of the heat
minal block.
ing unit 11 as urged by the spring 37, and since the 75
2. A temperature sensing unit for a vessel heated on a
engagement with the underside of any vessel on the
3,088,016
5
6
providing for external electrical connection at the range
terminal block.
surface unit, said temperature sensing unit comprising, in
combination, a body having a surface de?ning an up
5. A temperature sensing unit for a vessel heated on a
wardly directed aperture, mounting means on said body
engageable with the surface unit to mount said .body ?xed
surface unit separably connected by rigid connections to
a range terminal block, said temperature sensing unit com
prising, in combination, a body having a surface de?ning
an upwardly directed aperture, mounting means on said
relative to the surface unit, a top- having a downwardly
sloping skirt within said body and engageable with said
aperture de?ning surface, a metal cap of good heat con
ductivity on the upper end of said top; spring means
within said body urging said cap upwardly above the level
body engageable with the surface unit to mount said body
?xed relative to the surface unit, a top having a down
wardly sloping skirt within said body and engageable with
of the surface unit to engage the underside of any vessel
on the surface unit, the underside of said metal cap de~
?ning at least part of an annular wire space, a terminal
said aperture de?ning surface, a surface de?ning a co
axial opening in said top, a metal cap of good heat con
ductivity on the upper end of said top and having a stem
support washer disposed in said body, two terminals in
disposed in said coaxial opening, spring means within
sulatively carried in said support washer, a resistance wire
said body urging said cap upwardly above the level of
having two ends and disposed in said annular wire space, 15 the surface unit to engage the underside of any vessel
the ends of said resistance wire being connected to said
on the surface unit, the underside of said metal cap‘ de?n
terminals, ?rst and second conductors having inner ends
ing at least part of an annular wire space, an eyelet sup
terminating generally centrally under said temperature
port washer disposed on said stem, two eyelets insulative
sensing unit, ?exible lead wires interconnecting said ter
ly carried in said eyelet support washer, two ?exible lead
minals and the inner ends of said ?rst and second con 20 wires extending into said eyelets, a resistance wire having
ductors, and said ?rst and second conductors providing
two ends and wrapped as a doubled wire in a single axial
for external electrical connection to said resistance wire.
thickness in said annular wire space, the ends of said re
3. A temperature sensing unit for a vessel heated on a
sistance wire extending into said eyelets, a terminal pin
surface unit separably connected by rigid connections to
frictionally engaging each eyelet and providing electrical
a range terminal block, said temperature sensing unit com 25 connection of said resistance wire ends with said lead
prising, in combination, a body having a surface de?ning
wires, ?rst and second metallic tubes with insulated first
an upwardly directed aperture, mounting means on said
and second conductors therein, respectively, and disposed
body engageable with the surface unit to mount said body
parallel to and outboard of the rigid connections of the
?xed relative to the surface unit, a top having a downward
surface unit, the inner ends of said ?rst and second con
ly sloping skirt within said body and engageable with said 30 ductors terminating generally centrally under said tem
aperture de?ning surface, a metal cap of good heat con
ductivity on the upper end of said top, spring means with
in said body urging said cap upwardly above the level of
the surface unit to engage the underside of any vessel on
the surface unit, the underside of said metal cap de?ning
at least part of an annular wire space, a terminal support
perature sensing unit and being connected to said ?exible
lead wires, and said ?rst and second conductors providing
‘for external electrical connection at the range terminal
block.
35
6. A temperature sensing unit for a vessel heated on
a surface unit separably connected by rigid connections to
a range terminal block, said temperature sensing unit
comprising, in combination, a body having a surface de
?ning an upwardly directed aperture, a top having a down
washer disposed in said body, two terminals insulatively
carried in said support washer, a resistance wire having
two ends and disposed in said annular wire space, the ends
of said resistance wire being connected to said terminals, 40 wardly sloping skirt within said body and engageable with
?rst and second metallic tubes with insulated ?rst and
said aperture de?ning surface, spring means within said
second conductors therein, respectively, and ?xedly dis
body urging said top upwardly toward engagement with
posed parallel to and outboard of the rigid connections of
said aperture de?ning surface, a surface de?ning a co
the surface unit, the inner ends of said ?rst and second
axial opening in said top, a metal cap of good heat con
conductors terminating generally centrally under said tem 45 ductivity on the upper end of said top and having a stem
perature sensing unit, ?exible lead wires interconnecting
disposed in said coaxial opening, mounting means on said
said terminals and the inner ends of said ?rst and second
body engageable with the surface unit to dispose said
conductors, and said ?rst and second conductors pro
metal cap normally above the level of the surface unit
viding for external electrical connection at the range ter
minal block.
4. A temperature sensing unit for a vessel heated on a
surface unit separably connected by rigid connections to
a range terminal block, said temperature sensing unit com
prising, in combination, a body having a surface de?ning
an upwardly directed aperture, a top having a downward
ly sloping skirt within said body and engageable with said
aperture de?ning surface, spring means within said body
urging said top upwardly toward engagement with said
under urging of said spring means to engage the under
50 side of any vessel on the surface unit, said metal cap de?n
ing an annular wire space with said top, an eyelet support
washer disposed on said stem, two eyelets insulatively
carried in said eyelet support washer, two ?exible lead
wires extending into said eyelets, a resistance wire having
two ends and wrapped as a doubled wire in a single axial
thickness in said annular wire space, the ends of said re
sistance wire extending into said eyelets, a terminal pin
frictionally engaging each eyelet and providing electrical
aperture de?ning surface, a surface de?ning a coaxial
connection of said resistance wire ends with said lead
opening in said top, a metal cap of good heat conductivity 60 wires, ?rst and second metallic tubes with insulated ?rst
on the upper end of said top and having a stem disposed
in said coaxial opening, mounting means on said body
engageable with the surface unit to dispose said metal
cap normally above the level of the surface unit under
urging of said spring means to engage the underside of
‘any vessel on the surface unit, said metal cap de?ning an
annular wire space with said top, a resistance wire having
two ends and disposed in said annular wire space, ?rst
‘and second metallic tubes with insulated ?rst and second
and second conductors therein, respectively, and disposed
parallel to and outboard of the rigid connections of the
surface unit, the inner ends of said ?rst and second con
ductors terminating generally centrally under said tem
perature sensing unit and being connected to said ?exible
lead wires, and said ?rst and second conductors providing
for external electrical connection at the range terminal
block.
7. A temperature sensing unit for a vessel heated on a
conductors therein, respectively, and disposed parallel to 70 surface unit mounted on a support bracket and separably
and outboard of the rigid connections of the surface unit,
the inner ends of said ?rst and second conductors ter
connected by rigid connections at a terminal block to a
range top, said temperature sensing unit comprising, in
combination, an inverted cup-shaped body, a base closing
the underside of said body, a surface de?ning an upwardly
said resistance wire and the inner ends of said ?rst and
directed aperture in said body, a metal top having a down
75
second conductors, and said ?rst and second conductors
minating generally centrally under said temperature sens
ing unit, ?exible lead wires interconnecting the ends of
3,088,016
wardly sloping skirt within said body and engageable with
said aperture de?ning surface, spring means within said
body urging said metal top upwardly toward engagement
with said aperture de?ning surface, a surface de?ning a
coaxial opening in said metal top, a metal cap of good heat
conductivity on the upper end of said metal top and hav
ing a stem disposed in said coaxial opening, mounting
means on said body engageable with the support bracket
of the surface unit to dispose said metal cap normally
8
9. A temperature sensing unit for a vessel heated on a
surface unit mounted on a support bracket and separably
connected by tubular connections at a terminal block to a
range top, said temperature sensing unit comprising, in
combination, a metal inverted cup-shaped body, a base
closing the underside of said body, a surface de?ning an
upwardly directed aperture in said metal body, a metal
top having a downwardly sloping conical skirt within said
body and engageable with said aperture de?ning surface,
above the level of the surface unit under urging of said 10 a compression spring within said body and engaging said
spring means to engage the underside of any vessel on
the surface unit, said metal cap being spaced above said
metal top to urge same upwardly toward engagement with
said aperture de?ning surface, a surface de?ning a coaxial
top to de?ne an annular wire space therewith, an eyelet
opening in said metal top, a metal cap of good heat con
support washer disposed on said stem, ?rst and second
ductivity on the upper end of said metal top and having a
eyelets insulatively carried in said eyelet support washer, 15 stem disposed in said coaxial opening, metal tabs as part
apertures in said base, ?rst and second ?exible lead Wires
of said metal body engageable with the support bracket
passing through said base aperture and extending into said
of the surface unit to dispose said metal cap normally
?rst and second eyelets, respectively, a resistance wire
above the level of the surface unit under urging of said
having ?rst and second ends and disposed in said annular
compression spring to engage the underside of any vessel
wire space, the said ?rst and second ends of said resistance 20 on the surface unit, a shoulder on said stem engaging said
wire extending into said ?rst and second eyelets, ?rst and
metal top to de?ne an annular rwire space between said
second terminal pins frictionally engaging said ?rst and
top and cap, two wire apertures in said metal top, a re
second eyelets, respectively, and providing electrical con
sistance wire having the two ends thereof passed through
nection of said ?rst and second resistance wire ends with
said two wire apertures and wrapped as a doubled wire
said ?rst and second lead wires, respectively, ?rst and sec 25 in a single axial thickness in said annular wire space, an
ond metallic tubes with insulated ?rst and second con
insulator washer disposed on said stem against the under
ductors therein, respectively, and disposed parallel to and
side of said metal top and having apertures through which
outboard of the rigid connections of the surface unit, said
said wire ends are passed, an eyelet support washer dis
?rst and second conductors providing for external elec
posed on said stem against the underside of said insulator
trical connection at the terminal block, and the inner ends 30 washer, ?rst and second eyelets insulatively carried in said
of said ?rst and second conductors terminating generally
eyelet support washer, apertures in said base, ?rst and
centrally under said temperature sensing unit and being
connected to said ?rst and second ?exible lead wires.
second ?exible lead wires mutually insulatively passing
through said base apertures and extending into said ?rst
and second eyelets, respectively, said ?rst and second re
surface unit mounted on a support bracket and separably 35 sistance wire ends extending into said ?rst and second eye
connected by tubular connections at a terminal block to
lets, respectively, ?rst and second terminal pins frictionally
a range ‘top, said temperature sensing unit comprising, in
engaging said ?rst and second eyelets, respectively, and
combination, an inverted cup-shaped body, a base closing
providing electrical connection of said ?rst and second
the underside of said body, a surface de?ning an upwardly
resistance wire ends with said ?rst and second lead wires,
directed aperture in said body, a metal top having a down
respectively, ?rst and second metallic tubes with insulated
wardly sloping skirt within said body and engageable with
?rst and second conductors therein, respectively, and
said aperture de?ning surface, spring means within said
?xedly disposed parallel to and outboard of the electrical
body urging said metal top upwardly toward engagement
tubular connections of the surface unit, said ?rst and
with said aperture de?ning surface, a surface de?ning a
second conductors providing for external electrical con
coaxial opening in said metal top, a metal cap of good 45
nection at the terminal block, and the inner ends of said
heat conductivity on the upper end of said metal top and
?rst
and second conductors terminating generally centrally
having a stem disposed in said coaxial opening, mounting
under said temperature sensing unit and being connected
8. A temperature sensing unit for a vessel heated on a
means on said body engageable with the support bracket
to said ?rst and second ?exible lead wires.
of the surface unit to dispose said metal cap normally
10. A temperature sensing unit for a vessel heated on a
above the level of the surface unit under urging of said 50 surface unit mounted on a support bracket and separably
spring means to engage the underside of any vessel on the
connected by tubular connections at a terminal block to
surface unit, a shoulder on said stem engaging said metal
a range top, said temperature sensing unit comprising, in
top to de?ne an annular wire space between said top and
combination, a metal inverted cup-shaped body, an insu
cap, an eyelet support washer disposed on said stern, ?rst
lator base closing the underside of said body, a conical
and second eyelets insulatively carried in said eyelet sup 55 surface de?ning an upwardly directed aperture in said
port washer, apertures in said base, ?rst and second ?ex
metal body, a metal top having a downwardly sloping con
ible lead rwi‘res passing through said base ‘apertures and
ical skirt within said body and engageable with said aper
extending into said ?rst and second eyelets, respectively,
ture de?ning conical surface, a conical compression spring
within said body and engaging said metal top to urge
as a doubled wire in a single axial thickness in said annu 60
same upwardly toward engagement with said aperture de
lar wire space, the said ?rst and second ends ‘of said re
?ning
surface, a surface de?ning a coaxial opening in
sistance wire extending into said ?rst and second eyelets,
said metal top, an aluminum cap on the upper end of said
?rst and second terminal pins frictionally engaging said
metal top and having a stem disposed in said coaxial
?rst and second eyelets, respectively, ‘and providing elec
opening, metal tabs as part of said metal body engage
trical connection of said ?rst and second resistance wire 65 able with the support bracket of the surface unit to dis
ends with said ?rst and second lead wires, respectively,
pose said aluminum cap normally above the level of the
?rst and second metallic tubes with insulated ?rst and
surface unit under urging of said compression spring to
second conductors therein, respectively, and disposed
engage
the underside of any vessel on the surface unit,
parallel to and outboard ‘of the electrical tubular connec
a shoulder on said stem engaging said metal top to de?ne
tions of the surface unit, said ?rst and second conductors 70 an annular ‘wire space between said top and cap, two wire
providing for external electrical connection at the termi
apertures in said metal top, a resistance wire having the
nal block, and the inner ends of said ?rst and second con
two ends thereof passed through said two wire apertures
ductors terminating generally centrally under said tem
and wrapped as a doubled wire in a pancake coil in a
perature sensing unit and being connected to said ?rst and
single axial thickness in said annular Wire space, a mica
second ?¢Xible lead wires.
washer disposed on said stem against the underside of
a resistance wire having ?rst and second ends and wrapped
3,088,016
said metal top and having apertures through which said
wire ends are passed, an insulating eyelet support washer
disposed on said stem against the underside of said mica
washer, ?rst and second eyelets in said eyelet support
washer, apertures in said insulator base, ?rst and second
?exible lead wires passing through said base apertures and
generally centrally under said temperature sensing unit
and being connected to said ?rst and second ?exible lead
wires.
extending into said ?rst and second eyelets, respectively,
said ?rst and second resistance wire ends extending into
said ?rst and second eyelets, respectively, ?rst and second
terminal pins frictionally engaging said ?rst and second 10
eyelets, respectively, and providing electrical connection
References Cited in the ?le of this patent
UNITED STATES PATENTS
2,463,984
2,80'6,l122
2,822,455
2,980,875
of said ?rst and second resistance wire ends with said ?rst
and second lead wires, respectively, ‘?rst and second metal
lic tubes with insulated ?rst and second conductors there
in, respectively, and ?xedly disposed parallel to and out
10
board of the electrical tubular connections of the surface
unit, said ?rst and second conductors providing for ex
ternal electrical connection at the terminal block, and the
inner ends of said ?rst and second conductors terminating
15
Lederer ______________ __ Mar. 8,
Thunander ___________ __ Sept. 10,
Molyneaux et al _________ __ Feb. 4,
Sivacek _____________ __ Apr. 18,
1949
1957
1958
1961
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