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Judy @9 Ègä?
V. @BEAM ET AL
2,403,843
RES IS TANGE BULB THERMOSTAT
/
@horney
Patented July 9, 1.946
2,403,843
UNITED STATES PATENT `OFFICE
2,403,843
RESISTANCE BULB THERMOSTAT
Vilynn 0. Beam, Benjamin Cyr, and John M.
Wilson, Minneapolis, Minn., assignors to
Minneapolis-Honeywell Regulator Company,
Minneapolis, Minn., a corporation of Delaware
Application November 3, 1943, Serial No. 508,839
2o Claims. (Cl. 201-63)
This invention relates to a temperature re
sponsive device comprising a resistance element
having a high temperature coe?ñcient of resist»
ance which is responsive to a change in a con
dition.
This invention relates specifically to a room
2
response for a given temperature of air even
though the rate of air movement near the ther
mostat is temporarily increased. Where the baffle
arrangement is employed the air has to take a
tortuous or circuitous path whereby the rate of
air movement remains substantially constant
thermostat comprising an electrical resistance
even upon the occurrence of temporarily in
element which has a high degree of sensitivity
creased air movement in the neighborhood of the
to change in a condition and which is provided
thermostat. These baffle arrangements might
with a baffle arrangement for guiding air in a 10 be said to provide means for damping the effects
tortuous path so that the rate of air movement
of variations in air velocity in the vicinity of the
through the thermostat remains substantially
thermostat so that the thermostat responds not
constant.
Y
only to the general ambient temperature of the
This vinvention further relates to a tempera
space in which it is located but also its response
ture responsive device and more particularly to a 15 is governed by the general average air movement
thermostat comprising a resistance element for
in the complete space as distinguished from any
use in the electrical measurement of the teni
temporary
abnormal transient air movements.
perature of air in a space.
It is the primary object of our invention to pro
This invention utilizes in a resistance thermo
vide an effective temperature responsive device
stat a relatively long resistance element ofV high 20 such as a space thermostat of the resistance ele
coefficient of resistance such as a iine wire which
ment type which is provided with a baiile housing
is open wound on different framework construc
for guiding air in a tortuous path or paths so that
tions and wherein a relatively high wattage is
the rate of air movement remains substantially
used, as compared to such a resistance unit for
constant whereby the thermostat not only re
use with an ordinary direct current galvanometer 25 sponds to the general ambient temperature of the
type of instrument so as to obtain high sensi
space in which it is located but is responsive to
tivity. Itis desired to have a considerable change
the general average air movement in the com
in electrical characteristics or resistance` upon a
plete space.
relatively small change in temperature and With
It is another object of this invention to pro
out any particular amount of lag, and to accom 30 vide a temperature responsive device having a
plish this, the relatively long resistance wire, the
resistance element which is a relatively long
open winding, and the relatively high wattage
spirally Wound Wire.
must be utilized. The wattage employed in the
It is another object oi’ this invention to provide
resistance element is such that sufñcient heat is
a temperature responsive device having a resist
generated as to actually provide a chimney effect. 35 ance element which is a relatively long spirally
The difficulty in employing such an instrument
Wound wire mounted on an open framework.
is that the occurrence of unusual drafts, as per
It is still another object of this invention to
haps the opening of a door, a person Walking
provide a thermostat comprising a resistance
close to the thermostat, or some other abnormal
element having a high temperature coeñìcient of
transient condition, will cause a response of the 40 resistance in which the temperature oi” the am
thermostat which does not represent an average
bient atmosphere regulates the flow of current
condition of the air in a room.
So as to elimi
nate such abnormal air disturbances, it has been
found necessary to provide means to protect the
through the resistance element.
It is still a further object of this invention to
provide a resistance thermostat which has a con
sensitive element from the effects of such transi 45 siderable change in electrical characteristic or
ent and abnormal conditions without materially
resistance upon a relatively small change in tem
aiiecting its normal sensitivity. In the present
perature without any particular amount of lag.
invention, different loaiile arrangements are uti
It is another'object of this invention to pro
lized so that the response of the apparatus is not
vide
a resistance bulb thermostat which utilizes
materially affected by a temporary change in the' 50 a relatively
high wattage input.
rate of air movement at or near the thermostat.
Other and further objects Will become apparent
The balile arrangements are designed to slow
upon a study of the speciñcation and claims in
down the rate of iiow of air through the thermo
conjunction with the accompanying drawings
stat. That is, the resistance element is so pro
wherein are illustrated the preferred forms of our
tected that it will give substantially the same 55 invention.
y
'
2,403,843
3
Figure 1 is a front elevational view of a tem
perature responsive device with parts being
broken away disclosing the resistance element
wound on a frame member.
Figure 2 is a vertical sectional view taken on
line 2-2 of Figure 1.
Figure 3 is a horizontal sectional view taken
4
`Another form of the resistance thermostat is
illustrated in Figures 4, 5, and 6. The thermo
stat comprises a spirally wound resistance wire
65 having a high temperature coefficient of re
sistance. There is a frame member of insula
tion material for mounting the resistance wire
65 comprising opposed sides 61 and three arm
members 66, 68 and 18 which are secured between
on line 3_3 of Figure 1.
the opposed sides 61. One of the arms 66 is
Figure 4 is a front elevational View of a modi
fied form of the resistance thermostat parts be 10 spaced between the lower central portion of the
opposed sides 61, while the other two arms 68
ing broken away.
and 10 are spaced between and adjacent the top
Figure 5 is a vertical sectional view taken on
of the opposed sides 61 with arm 68 adjacent
line 5-5 of Figure 4.
the front portion of the opposed sides and the
Figure 6 is a horizontal sectional view taken on
other arm 10 adjacent the back portion of the
15
line 6-6 of Figure 4.
opposed sides 61. The bottom side of the lower
Figure ’1 is another modification of the re
arm 66 and the upper side of the two uppermost
sistanee thermostat disclosing a vertical eleva
arms 68 and 18 have notches 69 so that the
tional View of the front thereof, with parts beingspirally wound wire can be mounted vertically
broken away, and
Figure 8 is a sectional view taken on line 8-»-8 20 on the three arms thus forming a triangular
shaped resistance element with the apex at the
of Figure '1.
bottom of the opposed sides 61. Baiiie member
Referring to the drawings in detail, 20 desig~
nates a resistance bulb thermostat as illustrated
in Figures 1, 2, and 3. Thermostat 20 specifically
12 is spaced above the top of the frame carrying
the resistance wire 65 and comprises a right an
comprises a iine spirally wound resistance wire 25 gular depending flange portion 14 which is se
cured by screw means 16 to a base or terminal
element 22 of a high temperature coefiicient of
plate 1|. A rectangular frame member 18 hav
resistance which is relatively long mounted hori
ing an opening 19 extends substantially at right
zontally on a pair of spaced-apart substantially
angles from the depending flange portion 14 and
triangular plastic leg members 24 having open
is
spaced outwardly from and above the resistance
ings 2| and 23. A housing 28 comprising sides
element 65. The rear side 88 of the rectangular
34 and 36, a front portion 38, a back portion 4D,
frame member 18 spaces the frame carrying the
a bottom 2S, and an open top is spaced about the
resistance element 65 from the base plate 1|. Rec
resistance element 22. The rear portion 40 of the
tangular frame member 18 has opposed depend
housing 28 is secured to an insulation base plate
39 by screws 31. The triangular leg members 24 35 in_g ear members 82 which are attached to the
opposed sides 61 of the insulation frame member.
are secured by screw means 26 to the bottom 29
The
frame member 18 also comprises depend»
of the housing 28 and the leg members 24 are
ing flanges 8| and 83 at the front and rear por
also secured by pin means 3| to a rectangular
tions, respectively. A metal shield member 84
frame member 30 spaced above the top of the
housing 28. The rectangular frame member 3|) 40 open at the top and bottom is secured to the de
pending flanges 8| and 83 of the rectangular
is provided with an opening 25. The two trian
frame member 18. The metal shield member 84
gular shaped leg members 24 are spaced at op~
is spaced from and surrounds the resistance ele~
posed sides of the rectangular frame member 30
ment 65.
and pins 35 aid in securing the triangular leg
A housing 86 comprising a bottom 98, front
members together in spaced-apart relationship.
side 88, and opposed sides 92, is spaced from the
Each of the leg members 24 has notches 32 on its
bottom, front and opposed sides of the shield 84.
front and rear surfaces in which the spirally
The bottom 8i! of the housing 88 fits into a groove
wound resistance wire 22 is mounted.
93 of the base 1|. The opposed sides 92 of the
A bafile member 44 is attached by screw means
45 to the insulation base plate 38 adjacent the 50 housing 86 are secured by screws 84 to the opposed
sides of the base member 1|. The housing 85 is
top of the triangular leg members 24. This baffle
open at the top and is spaced below the rec
member 44 comprises a top plate 46 and two de
tangular frame member 18. This construction
pending intersecting ñanges 48 which divide the
allows air to communicate with a passageway 85
baille member into four substantially equal spaces.
A metal shield 58 which is open at its top and 55 between the housing 86 and the shield 84 and the
air thus communicates with the bottom of the
bottom is located in the housing 28 and the shield
shield 84 and contacts the resistance wire 65.
58 is secured at its top portion to the depending
The air then travels up the inside of the shield
flanges 48 of the bañie 44. The shield 50 is spaced
84 and over the resistance element 65, and then
from the triangular legs 24 which carries the re
sistance element 22, and the shield is also spaced 80 emerges out through the open top of the shield 84
to enter the room space.
from the bottom 28, sides 34 and 36, front portion
Conductors 96 and 98 connect to the opposite
38 and rear portion 40 of the housing 28. Thus,
ends of the spirally wound resistance wire 65 and
there is a passageway 54 formed between the
respectively extend through apertures 9'! in the
housing 28 and the metal shield 58 which com~
base plate 1| and connect respectively with ter
65
municates air of the room space with the bot
minals |08 and |82. These terminals |88 and |02
tom of the shield 50. The air thence rises over
are adapted to be connected with an electrical
the resistance element 22 and emerges out through
circuit (not shown).
the open top of the shield 58.
Figures 7 and 8 designate a third form of the
Conductors 56 and 58 are connected respec
tively to the opposite ends of the spirally wound 70 resistance bulb thermostat which is designated as
|04. The Y-shaped member |96 of insulation
resistance wire 22 and lead from the resistance
material is mounted within a shield member |88
wire 22 through apertures 60 in the base plate
comprising opposed sides | l0, rear side | I2, and a
38 and the apertures communicate with chan
front portion |14. The shield |88 is open at its
nels 62 for receiving the conductors 56 and 58 re
75 top and bottom. The arms of the Y~shaped frame
spectively, which extend to terminal posts 64.
5
2,403,843
6
member are spaced near the upper portion ofthe
shield |88 with the leg portion extending to
ward the bottom thereof. The Y-shaped frame
member |46 is spaced in the shield IGS so that the
arms of the frame member are disposed adjacent
the sides ||Ei and the leg portion being inter
mediate the sides IIB. The tip of the arms and
the bottom of the leg member of the Y-shaped
frame member iüû are notched as shown at IIS
for mounting a fine spirally wound resistance wire
||3 having a high temperature coefficient of re
sistance thereon. The spirally wound resistance
wire | I3 is mounted vertically on the frame mem
through> the other side of the baffle housing |24
and shield |08 which communicates with the
openings |38 and |46 at the bottom and top of the
housing |24, respectively.
(s
, In all of the thermostat devices disclosed in
this application, the air is guided through tortuous
paths in heat transfer relationship with the re
sistance element of the thermostat. Where the
air is conducted indirectly to the resistance ele
ment, the temperature of the air is measured Very
accurately, and there is no introduction of an
anemometer elîect.
Various changes and modiiications of this in
ber IIIG and extends around the frame of the
vention may occur to those who are skilled in the
Y-shaped member ISB and only contacts the frame
art, and we wish it to be understood that We in
at the bottom end of the leg and the top of the
tend to be limited only by the scope of the ap
arms. The V-shaped frame member Iûl'î and the
pended claims and not by the specific embodi
shield |08 are both secured to an insulation _base
ments disclosed herein~
member IIS by screw member |251.
We claim as our invention:
A baille housing |24 comprising a front portion
l. In a thermostatic device comprising a re
IZB, an upper portion |28, a bottom |3ß, and op
sistance element of high temperature coeiiicient
posed sides |32 and |34 surrounds the shield mem
of resistance, a frame__ member, the resistance
ber |63 and is spaced from the opposite sides Iiil
element mounted on the frame member, means
and the open bottom and top of the shield. The
for guiding air in a tortuous path in heat trans
portion |28 of the baille housing |24 is secured
fer relationship with the resistance element, the
through a lug member |29 to the base or terminal
resistance element being instantly and only re
panel IIB by screw means |3I. A groove |33 in
sponsive to the temperature of the Vair flowing
the terminal plate IIS receives an edge of the
through the tortuous means, and means for
bottom |30 of the housing |24 for securing this
mounting the thermostatic device.
portion of the housing to the plate I I9. Each of 30
2. In a thermostatic device comprising a re
the opposed sides |32 and |34 are spaced from
sistance element of high temperature coeilicient
the bottom i3d thereby forming openings iiiâ and
of resistance, a frame member, the resistance
|38 into the baille housing |24. The opposed sides
element being mounted on the frame member,
| 32 and |34 of the baffle housing |24 have angular
and baille means for guiding air in heat transfer
ilange members |40 and |42, respectively, spaced 35 relationship with the resistance element where
from the top portion |28 of the baille housing pro
by there is .a constant flow of air through the
viding openings |44 and |46 in the opposed sides
thermostatic device and the resistance element
of the baille housing. The angular flanges |43
responsive only to the temperature of the air
and |42 have a projecting portion |43 and |45,
flowing through the baille means.
respectively.r The top |28 of the baille housing 40 3. A thermostat comprising a resistance ele
|24 has depending ilange members |48, Iiìíl, and
ment of high temperature coeiiicient of resist
|52. Depending flange members |48 and |52 are
ance, an open frame member, the resistance ele
respectively spaced from the angular ilange mem
ment mounted in substantially non-contactual
bers |46 and |42 of the sides |32 and |34, respec
relationship on the frame member, a shield
tively, of the baille housing |24. Shield member
member surrounding the frame member carry
Hi8 has projecting members |54 and Iâë which
ing the resistance element, the shield member
are spaced adjacent and secured to the project
ybeing open at the top and bottom for guiding
ing portions |43 and |45 of the angular í‘langcs
air in heat transfer relationship with the resist
|40 and |42. Projecting member |54 is substan
ance element whereby the resistance element is
tially intermediate the ilanges |43 and Itii, and 50 responsive only to the temperature of the am
projecting member |56 is spaced between flanges
bient air guided into heat transfer relationship
I5@ and |52. There is an angular bar member
with it.
|58 comprising a base portion ISG and vertically
4. A thermostat comprising a resistance ele
projecting arms |552 and |64. Base portion ISii
rment of Iine spirally wound wire having a high
of the angular bar |53 is fastened to the bottom
temperature eoeincient of resistance, ya frame
ISG of the baffle housing |24 byrivets or the like
member, the resistance element mounted on the
means |65, and the vertical members H22 and |64
frame member, a shield member surrounding
are spaced intermediate the opposed. sides |352 and
|34 of the baille housing and the opposite sides
the frame member carrying thel resistance ele
ment, the shield member being open at the top
|||l of the shield member Hi8, respectively. The
and bottom, a baille member mounted over the
vertical members |62 and IM are respectively
top of the shield member for preventing air cur
spaced from the angular members |44 and |42
rents affecting the resistance element, the shield
of the opposed sides |32 and |34 of the baiile hous
and baille member guiding air in heat transfer
ing |24. Tortuous passageways are thus ‘formed
relationship with the resistance element Where
in the baille housing |24 and shield |38.. . A tortu 65 by the resistance element is responsive to the
ous passageway |66 is formed which extends be
temperature of the air flowing through the shield,
tween the side |32 and vertical member |62 of
and means for mounting the thermostat.
the angular bar |53, then over the top of the ver
5. A thermostat comprising a resistance ele
tical element |52 and down between the vertical
ment of high temperature coe?licient of resist
element I S2 and the adjacent side -| I0 of >theshield
ance, a frame member, the resistance element
Hi8, thence up through the shield ISB which sup
mounted on the frame member, a shield member
ports the resistance element,-then out of the top
surrounding the frame member carrying the re
of> shield |08 and over the projecting portion |54
Sistanoe element, the shield member being open
of the shield and then out through the openingt
at the top and bottom, a baffle member mounted
|44. A similar tortuous passageway-|68 is formed 75 above the top of the shield member, an open top
2,403,843
7
housing surrounding the shield member, the
shield member, and housing member providing
tortuous passageways for guiding air in heat
transfer relationship with the resistance element
whereby the resistance element is responsive only
to the temperature of the air flowing past the re
sistance element.
6. In a, thermostatic device comprising a re
12. A thermostatic device comprising a resist
ance element of high temperature coeiì‘icient of
resistance, means for mounting the resistance
element, and baffle means providing tortuous
paths for guiding air in heat transfer relation
ship with the resistance element and -the resist
ance element being responsive only to the tem
perature of the air flowing through the tortuous
paths.
sistance element of high temperature coefficient
13. In a thermostat comprising a relatively
of resistance, a frame member, the resistance ele 10
long resistance element of ñne spirally wound
ment mounted on the frame member, a shield
Wire having a high temperature coefficient
member surrounding the frame member carry
of resistance, means for mounting the resistance
ing the resistance element, the shield member
element, and tortuous means for damping the
being open at the top and bottom, and a housing
having an open top surrounding the shield mem 15 effects of variations in air velocity of a space on
the resistance element whereby the responsive
ber and being spaced from the shield member on
element only responds to the average ambient
all sides thereby providing tortuous passageways
temperature and average air movement in the
for guiding air in heat transfer relationship with
space.
the resistance element, and the resistance ele
14. In a thermostat comprising a relatively
ment being responsive to the temperature of the 20
long resistance element of ñne spirally wound
air ñowing past it.
wire having a high temperature coeflicient of re
sistance
7. In aelement
thermostatic
of highdevice
‘temperature
comprising
coefficient
a
sistance, an open frame Work mounting the re
sistance element in Substantially non-contactual
of resistance,
frame member, the resistance
element mounted on the frame member, and 25 relationship, the resistance element having a rel
atively high wattage input, the resistance ele
means comprising spaced apart elements provid
ment having a relatively wide variation in resist
ing cirouitous paths for guiding air in heat trans
ance upon a small change in temperature, and
fer relationship with the resistance element
means for moderating the effects of variations in
whereby the resistance element is responsive to
the temperature of the air guided by it.
30 air velocity in a space on the resistance element
whereby the resistance element responds to the
8. In a thermostatic device comprising a re
average air movement in the space.
sistance element having high temperature coeffi
15. A thermostat comprising a resistance ele
cient of resistance, a. frame member, the resist
ment having high temperature coefhcient oi re
ance element mounted on the frame member, a
baille housing surrounding the frame member 35 sistance, baffle means providing a tortuous path
for guiding air in heat transfer relationship with
carrying the resistance element providing tor
tuous passageways for guiding a constant flow of
the resistance element, and the resistance ele
ment being only responsive to the temperature
air in heat transfer relationship with the resist
of the air flowing through the tortuous path.
ance element and the resistance element being
16. In a thermostat comprising a resistance
responsive only to the temperature of the ambi in
element of high temperature coeñicient oi resist
ent air flowing past it.
9. In a thermostatio device comprising a tine
ance, a frame member mounting the resistance
element in a substantially triangular-shaped
spirally wound resistance Wire having high tem
unit, a shield open at the top and bottom sur
perature coefficient oi resistance, a frame mem
rounding the resistance element, an open top
ber, the resistance wire mounted on the frame
housing member spaced from the shield member
member, a barile housing surrounding the frame
providing a passageway between the shield and
member carrying the resistance wire providing
housing, the passageway between the housing
tortuous passageways in. the housing whereby the
resistance element is responsive to the average
and shield guiding air from the top of the hous
air movement of a space, and means for sup 50 ing to substantially the bottom thereof before the
air enters the inside of the shield member at its
porting the thermostatic device.
bottom end for contacting the resistance element
10. In a thermostatic device comprising a fine
splrally wound resistance element having high
in heat transfer relationship, and the air finally
passing out of the shield member at its top in
temperature coeiiicient of resistance, a frame
close proximity to the point of entrance of the air
member, the resistance element mounted on the
into the housing member whereby the resistance
frame member, a baffle housing surrounding the’
element is only responsive to the temperature of
frame member carrying the resistance element
providing tcrtuous passageways in the housing
the air flowing past it.
for guiding air in heat transfer relationship with
17. In a thermostat comprising a shield mem
the resistance element whereby the resistance 60 ber, a resistance element of high temperature co
element is only responsive to the temperature of
efficient of resistance, a frame member compris
ing two spaced apart triangular-shaped legs, the
the air flowing by it, and means lfor supporting
triangular-shaped legs having their apex por
the thermcstatic device.
l1. In a thermostatic device comprising a .fine
tions adjacent the bottom of the shield member,
spirallt.7 wound resistance wire having high tem 65 the frame member mounting the resistance ele
ment into a unit whereby the size of the resist
perature cceiiîcient of resistance,
Y-shaped
ance unit gradually increases from the bottom
frame member. the resistance wire mounted on
the Y-shaped frame member providing a trian
to the top of the shield, the shield member open
at the top and bottom surrounding the resist
Irrular shaped resistance unit whereby a relative
1y large area of the resistance wire is exposed to 70 ance element, an open top housing member
spaced from the shield member providing a pas
air, a baiiie housing surrounding the frame mem
sageway between the shield and housing, the
ber carrying the resistance wire providing tor
passageway between the housing and shield guid
tuous passageways for the flow of air through the
ing air from the top of the housing to substan
housing, and means for mounting the thermo
75 tially the bottom thereof before the air enters the
static device.
2,403,843
inside of the shield member at its bottom for con
tacting the resistance element in heat transfer -
relationship, and the air ñnally passing out of
the shield member at its top in close proximity
ance element of high temperature coeflicient of
resistance, a frame
to the point of entrance of the air into the hous
ing member whereby the resistance element is
only responsive to the temperature of the air
ñowing past it.
18. In a thermostatic device comprising a re
sistance element of high temperature coeiiicient
member located over the top of the shield mem
ber, the shield member having communication
with the baffle member, an open top housing
member spaced from the shield and bañie mem
bers providing a passageway between the shield
of resistance, a frame member, the resistance
element mounted on the frame, means for guid
ing air in a tortuous path in heat transfer rela
and housing, the passageway between the hous
ing and shield guiding air from the top of the
tionship with the resistance element, the resist
ance element being instantly and only responsive
fore the air enters the inside of the shield mem
housing to substantially the bottom thereof be
ber at-its bottom end for contacting the resist
to the temperature of the air'flowing through
the tortuous means.
ance element in heat transfer relationship, the
air emerging out of the top of the shield mem
'19. In a thermostatic device comprising a fine
ber into the balile member, then the air finally
spirally wound resistance wire having high tem
perature coeiiicient of resistance, a frame. mem 20 passing out of the bañie member into the space in
close proximity to the point of entrance of the
ber mounting the resistance element in a sub
air into the housing member whereby the resist
stantially triangular shaped unit, a baiiie hous
ance element is only responsive to the tempera
ing surrounding the frame member carrying the
ture of the air ñowing past it.
resistance Wire providing tortuous passageways
for the ilow of air through the housing.
VILYNN O». BEAM.
25
20. In a space thermostat comprising a resist
BENJAMIN CYR.
JOHN M. WILSON.
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