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Патент USA US2117578

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May 17, 1938.
H'. A. SMITH
2,117,578
THERMOSTAT ASSEMBLY
Filed July 14, 1936
32x/Q 310218254
4826726676
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Patented May 17, 1938
UNITED STATES PATENT oEFicE
:,n‘ls‘is
THERMOSTAT AssEiimL‘Y
Howard A. Smith. St. Louis, Mo., alignor to
Km» Monarch Company, 84.11011“, Mo., a
eerporationofhilaaonrl
Application July 14. ma, sei-m No. 90,549 `
u claims
(ci. zoo-iss)
supported in the usual manner by a casing I4
An object of my invention is to provide a ther
mostat assembly of simple construction, readily having supporting feet I6. »'A tie rod Il is illus
applicable to a wallie iron plate or the like, which
is heated by a heating element, the thermostat
5 being connected with the heating element to con
trol the action thereof.
A further object is to provide a thermostat as
V sembiy which is designed with a minimum oi ver
tical dimensions when mounted against a wallie
10 iron plate or the like, so that it can be mounted
trated as extending from the bottom of the grid
I0 through a cover plate 20 forming a bottom for
the casing I4. A nut 22 holds the cover plate 5
and grid in their respective positions.
The heating element I2 may be supported in
any suitable 'manner on the plate i0. By way
of illustration I show the type of heating element
disclosed in the Knapp et al., Patent No. 2,014,001
of September 10, 1935. It consists of a sheet metal
l plate 24 with insulator 26 extending from the
edge thereof. The outer ends of the insulators
Another object is to provide a thermostat as
sembly in which the bimetal element and- a pair are notched to receive the heating element l2
and the plate 24 is retained in position with the.
or contact spring arms are adjustable as to the
upper edges of the insulators contacting with the
temperature at which the contacts will be sepa
rated by means of a cam spaced laterally on the bottom of the plate I0 by a nut 2l on the bolt Il.
The actuating element for the thermostat as
plate from the contact arms, and a rocker eie
in the space available which, in the "low boy”
types of wallie irons, is rather limited.
' '
ment which serves the purpose of transmitting
20
the movement from the cam . to the contact
springs for 'adjusting them.
A further object is to provide a novel arrange
ment for supporting the contact springs on the
plate to be heated with a minimum of parts and
25
required time for assembLv.
With these and other objects in view, my in
vention consists in the construction, arrangement
and combination of the vvarious parts of the de
vice, whereby the objects contemplated are at
30 tained, as hereinafter more fully set forth,
pointed out in my claims, and illustrated in the
accompanying drawing, in which:
Figure l is- a side elevation of lower half of
a wallie iron, partof the casing thereof being
broken away to show my thermostat assembly
mounted on the bottom of the wallie plate or grid.
Figure 2 is a bottom plan view of the plate
with the thermostat assembly mounted thereon.
Figure 3 is a sectional view on the line 3-2 of
40 Figure 2 showing the rocker member which is an
important feature of my invention.
Figure 4 is an enlarged sectional view on the
line 4-4 of Figure 3 showing the mounting for a
cam on a stud extending from the plate.
Figure 5 is a perspective view of the rocke
45
member used in my assembly.
»
Figure 6 is an enlarged sectional view on the
I -line 0-0 of Figure 2 showing the contact spring
mounting; and
Figure 'l is a perspective view of an insulator
used in connection therewith.0n the accompanying drawing I have used the
reference numeral I. to indicate a wallie iron
grid or other plate or member to be heated by
sembly is a strip of bimetal 30 which has one end
mounted between the central portion of the plate 20
24 and the plate I0, which is responsive to the
temperature of the plate, as shown by dotted lines
in Figure 3, upon a rise in temperature.
'I‘he remaining parts of the thermostat assem
bly, which I will now describe, I have mounted 25
on the plate 24 for convenience, although obvi
ously if the heating element does not have a plate
such as 24 to support it, these parts can be mount
ed on the plate il. Indirectly they are mounted
on the plate I0 when carried by the plate 24, which
in turn is mounted on the plate l0.
A projection in the form of a bolt 22 extends
downwardly from the plates I0 and 24. On this
projection a pair of insulators 24 are mounted,
as well as a pair of contact springs 30 and 28 and
the necessary terminal members, washers, nuts
and the like to hold the parts properly assembled
and in electrical connection. 'I‘he insulators 24
are provided with hub-like portions 40 which
enter perforations of the springs 20 and 2l to
electrically isolate them from the bolt 32.
"
Since the springs can turn on the hubs 4l, I .
have provided- on each insulator a shoulder 42to engage the edges of the springs 26 and 2l to
prevent turning ofthe springs relative to the
insulators. 'I‘he insulators in turn are prevented
from turning relative .to the plates i0 and 24 by
means of a projecti4
44 extending from the
20d respectively, hich are normally engaged
with each other under tension of the springs.
’I‘he spring 2l has an extension 4l adapted to be
engaged by the bimetal element Il when warped
a resistance, heating element I2. This may be " sufficiently far to engage the extension, where- u
2
2,117,578
upon it will move the spring 36 upwardly in Fig
ure 3 to the dotted position (downwardly in Fig
ure 1), thus separating the contacts and breaking
the circuit to the heating element I2.
The normal position of the spring 38a is shown
by dotted lines in Figure 3. By moving this
spring upwardly, the extension I8 is likewise
moved upwardly so that it will take `a higher
temperature of the plate I0 affecting the bimetal
10 strip 30 to break the circuit. Accordingly by
adjustingl the position of the spring 38, the set
ting of the thermostat can be adjusted.
To accomplish adjustment of the spring arms
I provide a rocker element 50 having a pair of
laterally spaced projections 52 adapted to enter
perforations 54 in the plate 24. As obvious from
Figures 3 and 5, the rocker element can rock rel
ative to the plate when the projections are in the
perforations, since the projections have their
20 lower ends tapered.
,
One end of the rocker element 50 is provided
with insulating button 56 to engage the spring 38,
while the other end has a rounded nose 58 adapt
ed to be engaged by a cam element 60.
The cam
element 6D may be formed of sheet metal and is
rotatable on a reduced portion 52 of a nut 64.
For swinging the cam 6_0 ï provide an operating
arm 68 having a notched inner end 68. The
notched inner end 68 fits against a shoulder fili of
the nut $4 so that the arm 66 can be swung rela
tive to the cam 60.
'
I provide means for locking the cam and arm
relative to each other comprising an arcuate slot
andk clamping bolt connection' illustrated at
'i2-TM.
This constitutes a factory adjustment
so that the thermostat can be properly set to se
cure the desired range of temperature operation.
The operating arm 66 extends through a slot
16 in the casing i@ so that it is’engageable from
the outside of the casing and can be moved from
one end of the slot to the other by the user if
desirable. One end of the slot will produce con
trol of the temperature to a point where iight
brown Waíi’ies are baked by the waiiie iron, while
45 the other end will produce dark brown Waiiies.
Obviously my thermostat assembly can be used
in connection With electrical appliances other
than the one shown on the drawing.
Also changes may be made in the construction
50 and arrangement ofthe parts of my device With
out departing from the real spirit and purpose of
my invention, and it is my intention to cover by
my claims any modiñed forms of structure or use
of mechanical equivalents which may be reason
55 ably included within their scope.
I claim as my invention:
1. For use with a plate or the like to be heated,
a bimetal element responsive to the temperature
of said plate, a contact structure carried by said
80 plate and a cam element; said cam element be
ing spaced laterally on said plate from said con
tact structure and a rocker element arranged
substantially parallel to said plate, having a cen
tral portion pivoted relative thereto and its ends
65 movable toward and away therefrom and coact
ing with said contact structure and cam element
respectively.
2. For use With a plate or the like to be heated,
a bimetal element responsive to the temperature
70 of said plate, a contact structure carried by said
plate and a cam element; said cam element being
spaced laterally on said plate from said contact
structure, a rocker element having a pair of 'later
ally spaced projections, said plate having a pair
75 of perforations receiving said projections and the
ends of said rocker element coacting with said
contact structure and cam element respectively to
rock upon movement of the cam and thereby
move the contact structure toward or away from
said plate, said rocker element being located be
tween said plate and said cam element and con
tact structure whereby said projections are re~
tained in said perforations by said cam element
and contact structure.3. For use with a plate or the like to beheated,
a bimetal element responsive to the temperature
of said plate, a contact structure carried by said
plate and a cam element; said cam element spaced
laterally on said plate from said contact struc
ture, _a rocker element having a central portion 15
pivoted relative to said plate and its ends coact
ing withA said contact structure and cam element
respectively, said cam element being pivoted on
an axis at substantially right angles to the plate,
an arm element for operating said cam element, 20
said arm element being pivoted relative to said
plate, an arcuate slot in one of said elements and
a clamping screw thru the other of said elements
and thru said slot for locking said elements to
gether against relative movement.
4. For use with a member to be heated, a bi
metal element responsive to the temperature of
said member, a pair of contact arms carried by
said member and a cam element; said cam ele
ment spaced from said pair of contact arms, a 30
rocker element having a central portion pivoted
relative to said member, one of its ends coacting
with said cam element and the other end thereof
associated with said contact arms to adjust the
position thereof.
5. For use with a member to be heated, a bi
metal element responsive to the temperature of
said member, a pair of contact arms carried by
said member and a cam element; said cam ele
ment spaced from said pair of contact arms, a 40
rocker element having a central portion pivoted
relative to said member, one of its ends coacting
with said cam element and the other end thereof
associated with saidA contact arms to adjust the
position thereof, said cam element being pivoted 45
on one surface of said member and on an axis at
substantially right angles to said surface, an operating arm pivoted to said cam element and means
for locking said operating element and cam to
gether against relative movement.
50
6. For use with a member to be heated, a bi
metal element responsive to the temperature of
said member and a contact structure comprising
a pair of contact arms; means for mounting said
arms on said member comprising a projection 55
from said member, a pair of insulators thereon,
each insulator having a shoulder and a notch,
said member having a projection entering the
notches of said insulators to prevent turning
thereof relative to said member and said contact 60
arms having their edges engaging said shoulder to
prevent turning of the contact arms relative to
the insulators.
7. For use With a member to be heated, a bi
metal element responsive to the temperature of 65
said member and a contact structure comprising
a pair of contact arms; means for mounting said
arms on said member comprising a projection
from said member, a pair of insulators thereon,
each insulator having a shoulder, said contact 70
arms having their edges engaging said shoulder
to prevent turning of the contact arms relative
to the insulators and means for preventing turn
ing of the insulators relative to said projections.
8. For use with amember to be heated, a bi 75
3
2,117,578
metal element responsive to the temperature of
10. For use with a member to be heated, an
said member and a contact structure comprising
a pair of contact arms; means for mounting said
actuating element responsive to the temperature
of said member, a pair of contacts carried by said
arms on said member comprising a projection
member and a cam element; said cam element
from said member, a pair of insulators thereon,
each insulator having a notch, said member hav
ing a second projection entering said notch to
prevent turning of said insulators relative to said
member and means to prevent turning of said
contact arms relative to said insulators.
being spaced from said pair of contacts and a Sl
rocker element having a pair of laterally spaced
projections, said member having a pair of per
9. For use with a member to be heated, an
actuating element responsive to the temperature
oi said member, a pair of contacts carried by said
member and a cam element; said cam element
being spaced from said pair of contacts and a
rocker element having a central portion pivoted
relative to said member, one of its ends coacting
with said cam element and the other end thereof
associated with said contacts to adjust the dis
tance thereof from said member, said cam ele
ment being pivoted on one surface of said mem
ber and on an axis at substantially right angles
to said surface, an operating arm pivoted to said
cam element and means for locking said operat
ing element and cam together against relative
movement.
forations receiving said projections and the ends
of said rocker element coacting with said con
tacts and cam element respectively to rock upon
movement of the cam element and thereby move
the contact structure toward and away from said
member.
11. For use with a member to be heated, an
actuating element responsive to the temperature
of said plate, a contact structure carried by said
plate and a manually operable adjuster element;
said element being spaced laterally on said plate
from said contact structure and a rocker element
having a central portion pivoted relative to said `
plate and its ends coacting with said contact
structure and adjuster respectively, said rocker
element lying in a plane substantially parallel to
said plate.
'
HOWARD A. SMITH.
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