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'Dea 24, >1946. ‘
W_B_ GRlFFn-H
'
THERMOSTAT
Fíîled DSC. 12, 1941 _
6.5 M ¿Ffa/.zb /
la..
P
"y"
2,413,140
Patented Dec. 24, 1946
2,413,14()
UNITED vSTATES PATENT OFFICE
2,413,140
_
’
THERMOSTAT
'
William B. Griñith, Audubon. N. J., assignor
to Fire-Devices, Inc., a corporation of New
Jersey
Application December 12, 1941, Serial No. 422,762
21 Claims. (Cl. 20D-140)
My invention relates to improvements in fire
protection apparatus and particularly to thermo
stats for controlling electrical circuits for giving
an alarm and actuating other devices.
The object of my invention is to provide a rapid
rate in rise of temperature thermostat with fixed
temperature operating means.
A further object is to embody a fixed tempera
ture element in the air chamber of a rate in rise
of temperature thermostat, whereby the thermo
stat will be actuated by the ñxed temperature
element in the event of a slow smoldering lire
which would permit the temperature within the
2
Fig. 1 is a central vertical sectional view of a
thermostat embodying my invention.
Fig. 2 is a partial sectional view similar to Fig._1 showing the parts in the operative position.
Fig. 3 is a plan view oi Fig. 1.
Fig. 4 is a perspective view of a portion of the
ñxed temperature element and showing novel
means for attaching a sheet of insulating ma
terial.
In the drawing, in which like reference char
acters refer to like parts. 5 represents a thermo
stat body, or support, of unit construction,
formed of insulating material and provided with
thermostat casing to equalize with the tempera
a recess E, enclosed by a removable cover 8.
ture surrounding the casing Without operating 15 Lugs
I0 are provided upon the body 5 adapted
the rate in rise of temperature means. My de
for mounting the body upon the ceiling oi a room
vice will actuate when the atmosphere surround
to be protected from ñre hazard.
ing the thermostat reaches a predetermined tem- ’
The body 5 is provided with openings I2 for
perature and will operate the thermostat and
close the electric circuit regardless of the time 20 the entrance oi wires I3 and I4 of an electric cir
cuit including a source of current, or battery I5,
consumed for the iire to develop.
an alarm device, or bell I6. or other device I1.
A further object is to provide a ñxed tempera
A hemispherical shell I8, formed of thin heat
ture element in the form of a spring which is
conducting metal, is mounted upon the body 5
directly mounted upon the inner surface of the
and forms an air chamber 20. The Shell I 8 is
heat conducting metal shell of the thermostat. 25 tightly secured upon the annular depending por
and conilne the spring in a restricted position
tion 2I of the body 5. A flexible corrugated dia
by means of material which will fuse and release
phragm
22 is mounted within the shell I8 and
the spring at a predetermined temperature and
forms one wall of the chamber 20.
actuate the thermostat.
The body 5 is also provided with an airrelief
A further object is to provide means for elec 30
chamber 25, which is in communication with the
trically insulating the spring for preventing the
atmosphere through a passage 25 formed in the
latter and the shell of the thermostat from be
5; The diaphragm 22 is mounted in spaced
ing energized after the spring has been released - body
relation with the central portion of the body 5
and closed the circuit between the conductors
and the chamber 25 permits the diaphragm to
35 be
of the thermostat.
deiiected.
A further object is to construct a stop plate, or
A
pair of electrical contacts 2'8 and 29 are
support, for the flexible diaphragm oi' a rate in
mounted upon the body 5. The contact 28 con
rise of temperature thermostat so that the stop
sists of a screw located centrally upon the body
plate will permit the free movements of the spring
and
adjustably mounted in a sleeve, or rivet 3.0,
of the iixed temperature device to pass freely 40
having a bore provided with a screw thread en
through an opening formed in the Stop plate.
gaged by the screws 28. A conductor plate 3l,
A further object is to construct the body of
of `T-shaped construction is secured upon the
the thermostat with a novel testing vent and
body 5 by the sleeve 30 and also by a rivet 32.
means for sealing the vent.
`
45 The plate 3l is provided with a binding screw 3@
A further object is to provide a thermostat of
to which the wire I3 is’attached. ‘
unit construction having a rate in rise of tem
The contact 29 is in the form of a spring plate
perature device and iixed temperature operating
having one end thereof secured by a rivet 35 to
the body 5. A conductor plate 38 is also secured
means which will be durable and can be manu
factured at a low cost.
to the body by the rivet 35. The body 5 has an
upstanding wall 3'! for insulating the plate 85
These together with various other novel fea.
from the contact screw 28.
tures of construction and arrangement of the
The plate 36 is provided with a binding screw
parts. which will be more fully hereinafter de
scribed and claimed, constitute my invention.
Referring to the accompanying drawing:
- 38 to which the wire Il is attached.
The free ,
end of the spring contact plate 28 is normally
in spaced relation to the contact screw 28 and
anarco
3
~
el
.
The ñxed temperature element, or spring d5, ,
is adapted to be moved by the diaphragm 22 into
engagement with the contact 28 for closing the
is electrically insulated from the diaphragm 22
electric circuit.
in a novel manner. A layer or sheet of insulating
Y
Y
The body 5 is provided with a restricted orifice,
material 60 is attached to the cylindrically
or aperture dil, having hltering material ¿li there
in adapted to be compressed by a sleeve ¿i2 having
~means of end tongues 5I and 52, as shown in
an aperture ¿lí-3.
curved medial portion of the plate spring ¿15, by
Figs. 1 and 4. The spring ¿i5 is provided with
The sleeve ¿l2 is in threaded ,
apertures S3 and ed to receive said tongues, there- _
engagement with the body 5 and is adapted to
be adjusted ior allowing slow changes of air
pressure within the chamber 2@ to equalize with
by rigidly securing the sheet 5G. to the spring t5
for insulating the latter from the diaphragm
22 and thereby .preventing the shell i3 from
being charged when the electric circuit is closed
between the contacts 28 and 28, by the engage
ment of the diaphragm with the contact plate
29, as shown in Fig. 2.
A novel testing means is provided for calibrat
ing the rate of the escapement of air from the
chamber 28 through the restricted orifice di), and
for regulating the adjustment of the contact
the atmosphere in a manner well lmown in the
art.
.
A sudden rate in rise ci temperature thermo
stat is :formed as above described which will dis
tend the diaphragm 22 and close the circuit
between the contacts 28 and 29, when the air
conñned in the chamber 2Q, by the -restricted
orifice di), expands due to a sudden increase
in temperature acting upon the outer surface
20 screw 28, after the device has been completely of the shell it in the event of a ñre.
assembled.
'
.
A novel feature of my invention is a 4iixed
The chamber 26, in addition to having the
temperature element, or actuating means 435,
' restricted orifice 4B, is provided With'an aper
` adapted for closing the electric circuit between
ture 66, as shown in Fig. 1, or an aperture 56a,
the contacts 28 and 29, in the event of a slow
as shown in Fig. 2, through which air under
smoldering ilre causing a rise in temperature
pressure may be forced into the chamber 2li.
which is too slow to operate the diaphragm, the
:dxed temperature element d5 will actuate _the
thermostat at a predetermined temperature.
The ñxed temperature element d5 comprises
The aperture 68 is formed through the body,
length, with the members 4l and H8 positioned
approximately at right angles and forming the
restricted medial portion 45.'
`'Foe hired-temperature element or spring 45
Fig. 2, is formed- through a iitting 1li attached '
or support 5, and has a conical portion 6l which
is adapted to be sealed by a lead pellet E8 after
a spring preferably in the form oí a fiat plate 30 the device has been tested. 'I‘he conical aper
ture 6l is adapted for readily attaching an air
' spring d5 ' and located within the chamber 2G.
hose having a conical nozzle, not shown in the
V The spring 45 is provided with a folded or looped
drawing. ’I'he testing aperture 56a, shown in
portion B6, located adjacent to the center of its
directly to the shell I8. Said ñtting 'I0 is pro
vided with a threaded sleeve lI adapted for the
attachment of an air hose coupling, not shown
in the drawing. The aperture 65a is adapted to
is formed with its members 4l and 48 of slightly ’
be sealed by means of a lead pellet, such as
diiïerent lengths. An end portion 48 of the longer
member 4l is permanently secured to the inner 40 shown at 68 in Fig. 1, or by a screw, or threaded A
plug l2, as shown in Fig. 2.
surface of the shell la by welding or securing it
By providing the device with a testing aper
with hard solder 5d. The spring 45 is placed
ture 56, or 58a, communicating with the cham- .
under deñection and the end portion 5I of the
-ber 2li, which aperture is separate from the re
shorter member 48 is secured tothe inner sur
face of the shell by soft solder 52, or other mate 45 stricted orifice Q0, the device can be readily -.
tested after it is assembled to .ascertain if the
rial which is fusible at a predetermined tem
chamber 20 is air tight and theshell I8 and
perature. By this construction the medial portion
other parts are properly secured upon the body.
@t of the spring 45 is normally held in spaced
5 to prevent leakage.
relation with the diaphragm 22.
By applying air under pressure through the
A stop, or‘support plate 5t is provided for
aperture 66, or the aperture 56a, to the cham
limiting the movement of the diaphragm 22 by
ber 20 the diaphragm 22 may be distended under
excess pressure without the chamber 20. The
a predetermined air pressure and the screw 28
may be adjusted so that the electric circuit will
- plate 54 is provided with a central aperture, or
opening 55, for the `passage'of the medial portion
48 of the spring 45, into engagement- with the
be closed between the contacts 28 and the dia- .
phragm at the desired pressure of air within
diaphragm 22, for moving the latter and the
contact plate _28 into electrical contact Vwith the
the chamber 20.
ture element 45 is released V_from the shell by the
fusing of the material S21-fiat a predetermined
temperature of the atmosphere surrounding the
_
testing- aperture.- When air is injected through*~
60
an aperture 65, or 56a, into the chamber 2U un- ’
der the desired testing pressure, the sleeve 42, of
shell I8.
The diaphragm 22 is provided with-an annular
upstanding iiange 56 which is secured upon the
annular shoulder 51 ci the body 5. The vstop
plate 54 is provided Awith a similar flange 58 which
nts over the ñange 56 of the diaphragm. By
this construction the outer edges of the dia
phragm 22 and stop plate 54 are rigidly mounted
upon the body 5, and electrically insulated from
the shell I8. The support, or body 5, is provided
the restricted oriñce 40, may be adjusted until the .
necessary pressure is applied by said sleeve 42 to
the filtering material 4I, for regulating the rate
of escapement of air through the restricted ori
ñce 40, from the chamber-'20 and said rate may be
y calibrated to permit the air to equalize with the
with an annular recess 5S surrounding the dia
phragm and through which the restricted orifice
48 and the passage 66 communicate with theA
. air chamber 2E.
-
An adjustment of the restricted orifice 4D is
made possible by providing the chamber 2|! with a
_ center contact screw 28, when the fixed tempera
A75
atmosphere within a deilnite period of time.
Heretofore in devices of this character the Var
ious parts were tested separately before they were
attached and assembled> in the completedstruc
ture. My novel testing means assures accuracy
in operation and all uncertainty is eliminated.
The operation of my invention is as follows:-
ariane
In the event of a nre causing asudden increase
in the temperature ci’ the air, surrounding the
shell I8, the pressure of the air within the cham
ber 20 will increase and distend the diaphragm
and close the electric circuit between the contacts
28 and 29 and operate the signal devices I6 and i1.
The diaphragm 22 will maintain the circuit
closed during the time required for the air under
pressure in the chamber 20 to equalize with the
atmosphere through the restricted orifice 40. Ii’
the increase in the pressure of the air in the
chamber 20 is slow and equalizes with the atmos- `
phere without moving the diaphragm, the :tinted .
temperature element, or spring 45, will operate
gize the signal upon expansion oi the air in said
_ 'chamber responsive to the action of heat, a fixed
temperature element rigidly mounted in said
chamber 'and fusible means normally‘holding _said
element in inoperative position and fusible under
the action of heat to release said element whereby
. it will move through the opening and force said
diaphragm into circuit-closing position.
4'. A device of the character
described, an in
sulating support, a pair oi’ electrical
contacts
mounted thereon in circuit with a source oi cur
rent supply and a signal, an air chamber mounted
on said support, a flexible
diaphragm associated
with said air chamber and normally spaced from
the diaphragm and close the circuit,v when the
one of said contacts, spring means normally hold#
fire reaches a predetermined temperature. When
ing said diaphragm in inoperative spaced rela
the atmosphere surrounding the shell i8 reaches
tion to said ñrst contact and electrically connect
a predetermined temperature the iusible mate .i ing
said diaphragmwith said second contact, a
rial 52 will melt and release the spring d5. When
spring element enclosed by said chamber and fus
so released the spring I5 will engage and move the
diaphragm into the position shown in Fig. 2,' and 20 ible means adapted upon fusing to permit said
spring element to move said diaphragm into cir
maintain the diaphragm 22 and the contact plate
cuit-closing position relatively to said iirst con
29 in circuit closing position with the contact
tact.
'
screw 28, thereby continuously operating the
5.
In
a
device
ci
the
character
described,
an
alarm or devices included in the electric circuit.
insulating support, a breather opening therein,
Various changes in the construction and ar
a pair of electrical contacts mounted thereon,
rangement ci’ the parts may be made without de
a heat-responsive air chamber connected to said
parting from my invention.
support and communicating with said breather
I claim:
opening, 'a plate mounted in said chamber and
Y. 1. In a device oi the character described, an
insulating support, a pair of conducting members 30 provided with an opening therein, a‘ñexible dia
phragm engaging said plate but spaced from
mounted thereon and adapted for connection to a
said support to provide a relief chamber having
source of current supply and a signal, a pair of
an air passageway communicating with the _at--l
conductors each electrically connected to'one of
mosphere, spring means connected to one of
said conducting members respectively, a heat
said contacts and engaging said diaphragm to
conducting air chamber mounted on said insulat
ing support and provided with an air opening , normally retain it from engagement with the
other contact, a releasable fixed temperature ele
therein, a flexible metallic vdiaphragm electrically7
ment mounted in said air chamber and fusible
connected with one of said conductors and form
means normally holding said element in inoper
ing a wall of saidchamber and automatically
ative position and adapted, upon fusing, to permit
movable relatively to the other one of said con
said element to move through the opening in
ductors to clos’e the circuit and energize the signal
said plate and move said diaphragm into circuit
by the expansion of air in said chamber, a re
closing position relatively to said other contact.
leasable vspring mounted in said chamber and
6. In a device of the character described, an
adapted to positively move said diaphragm into
insulated support, an air chamber mounted
circuit closing position, and fusible means nor
mally holding said spring in inoperative position.
thereon, a flexible diaphragm associated with
said chamber and in circuit with ,a source of cur
2. In a device of the character described, an
rent supply and a signal and adapted to be dis
insulated support, a pair of terminals mounted
upon said support and adapted to be included in 50 tended toclose the circuit and energize the signal
upon expansion of air in said chamber and a sealed
an electric circuit including a source of current
fixed temperature element normally held under
and an energizable device, an air chamber
tension and releasable by the action of heat to
mounted upon said support, a flexible diaphragm
move said diaphragm into circuit closing posi
forming a wall of said chamber and in circuit with
tion and energize the signal.
one of said terminals and adapted to be distended
7. In a device of the character described, an
to close the circuit through the other one of said
insulating support, a pair of electrical contacts
mounted upon said support and adapted to be
included in an electric circuit, a hollow metal
in said chamber and means normally holding said 60 shell mounted upon said support and forming a
heat responsive chamber, a flexible diaphragm
element in inoperative position-and responsive to
terminals and energize the signal upon expansion
of the air in said chamber responsive to the ac
tion of heat, a. fixed temperature element mounted
the action of heat to release said element whereby
electrically connected with one of said contacts
and forming one Wall of said chamber, means
mounting the diaphragm upon said support nor
cuit-closing position.
3.` In a device of the character described, an in 65 mally in spaced relation with the other one of
said contacts and movable by the expansion of
sulated support, an air chamber mounted thereon,
air in said chamber for bringing the contacts into
a plate forming a wall of said chamber and pro
electrical connection, a resilient element mounted
vided with an opening therein. a flexible dia
in said shell and adapted for moving the dia
phragm mounted on said plate, a pair of elec
phragm into circuit closing position, and fusible
trical contacts mounted upon said support and
means securing said element in a restrained posi
in circuit with a source of current supply and a
tion upon the inner surface of the shell in spaced'
signal, a conductor connecting said diaphragm
it will positively move said diaphragm into cir
with one of said contacts, said diaphragm adapted
to be distended to circuit closing position rela
tively to the other one oi said contacts and ener
relation with the diaphragm, and said fusible
means adapted to fuse and release said element
at a predetermined temperature for engaging
75A and moving the diaphragm.
`
casarse 'i
8. In a device ci t
li. in a device oi the character described, an
character described, an
insulating support, electrical contacts mounted
insulatmg support, a pair ci electrical contacts
mounted upon said support and adapted to be
upon said support and included in. an electric
circuit, a metallic shell mounted upon said sup
port and forming a heat responsive chamber, a
included in an electric circuit, a metallic shell
mounted upon said support and forming a heat
neiribie diaphragm electrically connected with
responsive air chamber, a ‘ñexible diaphragm
one of said contacts and i’og one Wall of said
electrically connected `with one ci said contacts
chamber, means mounting the diaphragm upon
and forming one wall of said chamber, means
said support normally in spaced relation with the
mounting the diaphragm upon said support nor
mally in spaced relation `with the other one ci’ 10 other one oi the contacts, said diaphragm adapted
to be moved by the expansion of air in said
said contacts, said diaphragm adapted to be
chamber for bringing the contacts into electrical
l moved by the expansion of air in said chamber
connection a spring metal plate having mexn=
for bringing the contacts into electrical con
bers
thereof arranged at approximately right
nection a spring metal plate having members
angles adjacent to its medial portion, means per
thereof arranged at approximately right angles 1,5 manently
securing one end ci said plate-upon the>
adjacent to its -medial portion, means perman
shell,
means
iusible at a predetermined tempera
ently securing one end of said plate upon the
ture securing the opposite end ci said plate to the
v inner surface of the shell, means fusible at a
shell with the plate restrained from engagement
predetermined tenziperatin‘eV securing the oppo
\ with'the diaphragm, a sheet of insulating mate
20
site end of said plate upon the inner surface of
\ria1 interposed between the medial portion oi
the shell `with said plate restrained from engage"
ment with the diaphragm, and said plate arranged - the plate and the diaphragm, said sheetv having
end tongues formed thereon, said plate having
for engaging the medial portion thereof `with the
apertures formed therein for receiving said
diaphragm for moving the latter into circuit clos
tongues and securing said sheet upon the plate,
ing position relatively to said contacts upon the 25 and
said plate arranged for moving the diaphragm
iusing of the fusible means.
into
circuit closing position relatively to said
9, in a device ci’ the character described, an
contacts upon the fusing ci said fusible' means.
insulating support, a pair ci’ electrical contacts
i2. 'in a device of the character described, an
>mounted upon said support and included in an
insulating support, a pair cielectrical contacts ‘
electric circuit, a metallic shell mounted upon
mounted upon said support and adapted to be
said support and forming a heat responsive cham
connected with a Source of current supply and
ber, a flexible diaphragm electrically connected
an
energizable device, an >.annular flange upon said
with one of said contacts and forming one wall
support, a thin metal hemispherical shell secured
of said chamber, means mounting the diaphragm
upon said support normally in spaced relationV 35 upon said flange and forming anrair chamber,
a ñexible diaphragm electrically connected with
with the other one oi said contacts, said dla
one of said contacts and forming one wall of said
phragm adapted to be moved by the expansion of
chamber and adapted to be distended to bring
air in said chamber for bringing the contacts
into electrical connection saidsupportiorming
’ said contacts into electrical connection upon the
cuit closing position relatively to said contacts,
means fusible at a predeteed temperature
securing said element in a restricted position
Y diameter than the shell, a shoulder upon said
insulating means between the diaphragm and the 40 expansion of air in said chamber against the
diaphragm responsive to the action of heat, an
shell, a resilient element mounted in said cham
annular ñange upon said diaphragm of smaller
ber adapted for moving the diaphragm into cir
support upon which the ñange of the diaphragm
- is secured in spaced relation with the shell, a plate
upon said shell »in spaced relation with the dia- '
A
phragm, and insulating means interposed between
said element and the diaphragm for insulating
said element when in engagement vvith> the dia
phragm.
'
.50
l0. In a device oí the character described, an
insulating support, a pair of electrical contacts A
having an annular ñange mounted upon theñange ' »
of the diaphragm, said plate having> a central
opening formed therein, a spring plate'located'
in seid chamber and adapted for movement
through said central opening oi' the plate into
engagement with the diaphragm for moving the
latter into a position to bridge said contacts, and
fusible material normally securing the spring
mounted upon said support and included in an
plate upon the inner surface ci the shell in spaced ^
electric circuit, a metallic shell mounted .upon
the support forming a heat responsive air cham 55 relation with the diaphragm and adapted to fuse
and release the spring plate at a predetermined
ber, a. ñexlble diaphragm electrically connected
with one of said contacts and forming one vvall
13. A thermostat comprising an insulating sup
of said chamber, means mounting the diaphragm
port
having a pair of terminals mounted thereon
upon .said support in spaced relation with the
and a contact member mounted therethrough,
other one of said contacts, , said diaphragm 60
a metallic conductor connected to one of the said
adapted to be moved by the expansion oi air
terminals _and to the 'said contact member, a
in said chamber for bringing the contacts into
diaphragm positioned across an aree. of the said
electrical connection a spring metal plate hav
temperature,
~
-
'
-
ing members arranged at approximately right
insulating support,said diaphragm normally po
permanently securing one end of the plate upon
the shell, means fusible at a. predetermined tem
member, a flexible contact member connected to
angles adjacent to its medial portion, means 65 sitioned in spaced relation to the‘said contact
perature securing the opposite end of said plate
the other one of the said terminals land engaging
the said diaphragm, a metallic member amxed
upon the shell with the plate spaced from' the
diaphragm, a sheet of insulating material
mounted upon the medial portion of the plate for
to the said insulating support, a spring' metal
strip aiiixed at one of its ends by conventional
means to the said metallic member and having'
insulating the latter from the diaphragm, and
said plate arranged for moving the diaphragm
into circuit closing position relatively to said
contacts upon the fusing of said fusible means. 75
metal strip being retained in strained position
and vadapted upon the fusing. of the fusible
its other end afiixed'to the said metallic mem
ber by means of fusible solder, the said spring-
9
2,413,140
1
solder to `move into engagement with the said
diaphragm and cause the said ilexible conductor
to be moved into engagement with the said con
tact member so as to complete a circuit through
the device.
.
of the said terminals and to the said contact
member, a _secondary metallic contact member
connected to the other one of the said terminals
and spaced apart from the said contact member,
al metallic shell positioned on the said support,
a spring metal strip affixed to the said metallic
shell by means of fusible solder, the said spring
` 14. A thermostat comprising an insulated sup
port having a pair of terminals mounted thereon
and a contact member mounted therethrough, a
metal strip being retained in strained position
metallic conductor connected to onecf said ter
and adapted upon the fusing of the solder to
minals and to the said contact member, a dia-I 10 forcefully engage the said secondary metallic
phragm positioned across an area of the said
conductor end_move the same into engagement
insulatirng,r support, a shield having a centrally
with the said contact member, so as to complete
positioned opening therein positioned across the
a circuit through the device.
’
said diaphragm, a ñexible contact member con» l
ld. A thermostat comprising an insulating sup
nected to the other one of the said terminals and 15 port having a pair oi circuit terminals mounted
engaging the said diaphragm centrally thereoi,
thereon, and a contact member mounted there~
a metallic shell aiñxed to the said insulating sup
through, a metallic conductor connected to one
port, a spring metal strip aillxed at one end of ~ of the said terminals and to the said contact
its ends by conventional means to the said metal~
member, a secondary metallic contact member
lic shell and having its other end añixed to the
connected to the other one oi the said terminals
said metallic shell by means of fusible solder, the
and spaced apart from the said contact member,
said spring metal strip normally tending to move
a metallic shell positioned on the said support, a
into engagement with the said diaphragm and
spring metal strip oiangular formation having
4being retained in strained position by the said
one oi its ends afiixed to the metallic shell by
fusible solder and adapted upon the fusing there
conventional means and having its other end
of to move into the said opening oi the said shield
aillxed tothe said metallic shell by means ci
and into engagement with the said diaphragm
fusible solder, the said spring metal strip being
and cause the said ñexible conductor to be moved
retained in strained position and adapted upon
.into engagement with the said contact member
the fusing oí’ the fusible solder to engage the
so as to complete a circuit through the device. 30 said secondary metallic conductor and move the
l5. In a circuit closer, an insulating support
same into engagement with the said contact mem
member, a pair 'of circuit terminals mounted
ber so as to complete a circuit through the device.
thereon, and a contact member mounted there»
i9. In a device oi’ the character described, an
through, a metallic' conductor connected to one
insulating support, a pair of electrical contacts
of the said terminals and to the said contact mem
ber, means adapted to establish an electrical cir»
cuit between the said terminals, said means com
prising a' flexible conductor connected to the other
one of the said terminals and having a portion
thereof spaced apart from although adjacent to
the said contact member, a shell aiiixed to the
said support member, a, spring aiiixed to the
said shell by means of fusible material, the said
spring adapted upon being freed at one end
thereof by the fusing of the fusible material to
move toward the said flexible conductor, means
positioned between the said spring and the said
flexible conductor adapted to receive and direct
movement of the said spring to the said ilexible
conductor to insure the application of the spring's
movement thereto, said means comprising a dia
phragm positioned over a relatively large area
of the said support member, said flexible con
ductcr adapted to move into contact with the
said contact member upon being moved by the
said diaphragm and spring, so as to establish an
electrical circuit through the device.
16. A thermal circuit controller having a pair
of electrical terminals adapted for connection
with a source of current supply and an energiz
able device, an air chamber positioned in ~opera
tive relation to said terminals, a distendable ele
ment associated with said chamber and adapted
to be distended to establish electrical connection
vbetween said terminals and energize said device
by pressure of the expanded air in the chamber
against said element responsive to the action of
heat and means inert to the expansion of air
in said chamber but responsive to the action of
heat for also distending said element to establish
electrical connection between said terminals.
17. A thermostat comprising an insulating sup
port having a pair of circuit terminals mounted
thereon and a contactmember mounted there
through, a metallic conductor connected to one
mounted upon said support and adapted ior con
nection with a source or” current supply and an
-energizable device, an air chamber mounted upon
said support, a ñexible diaphragm electrically
connected with one ci said contacts and forming
40 one wall of said chamber and adapted to be dis
tended to bring said contacts into electrical con
nection and energize said device by pressure of
the expanded air in the chamber against the dia
phragm responsive to the action of heat, said
chamber having a restricted orifice through
which the air in the chamber may slowly equalize
with the atmosphere, means for regulatingÍ the
rate oi' discharge through said orifice, said cham
`
ber having a second aperture in communication
50 therewith through which air under pressure may
be injected into said chamber for testing and
regulating the rate of discharge through said
restricted oriñce, and means for sealing said
second aperture.
20. In a device of the character described, an
insulating support, a pair oi' electrical contacts
mounted upon said support and adapted for con
nection with a source of current supply and an
energizable device, a shell secured upon said sup
60 port forming an air chamber, a flexible diaphragm
electrically connected with one of said contacts
and forming one wall of said chamber and
adapted to be dlstended to bring into electrical
connection said contacts and energize said de
vice upon the expansion of air in said chamber
against the diaphragm responsive to the action
of heat, said chamber having a restricted orifice
through which the air in said chamber may slowly
equalize with the atmosphere, means securing the
periphery of the diaphragm upon said support,
said diaphragm being of smaller diameter than
said shell and located in spaced relation with the
latter, said support having a testing aperture
formed therein and communicating with said
chamber between the periphery of the diaphragm
essere@
lli»
and the shell and adapted for injecting sir under
pressure into said chamber for testing the reu
spense of scid diaphragm te sir under pressure,
and means for sealing seid testing aperture.
2L .in e. device of the character described, en
insulating support, e, pair of electrical 'contects
mounted upon said support and adapted for ccn
rxection with a. source of current supply end en
energizehle device, an annuler ñenge upon seid
support, e thin metal hemispherical shell secured
upon said ñange and forming au air chamber,
seid chamber having a. restricted oriñce through
which air in seid chamber may slowly equalize
’with the atmosphere, e, flexible diephragmelec
trícally connected with one oí saidcontacts end _
forming one Well of seiclchember -end edepted
to> be distended to bring scid contacts into -elec~=
trlcel connecticu by pressure of the expendecì _
cir in the chemie-er
the eìiepmeem respcua
sive to the
ci heet, means securing the
' periphery ef the diephregm upon seid support,
seid diaphragm heine of smaller diameter than
seid shelf. erm? lcceteá in spaced peleticn with the
letter, seid support heving aconicel eperture
formed therein emi communicating with seid
chamber betr-reen the periphery of the diaphragm
and the shell ami located. seperately from seid
restricted oriñceg said .conical aperture tapering
ìnwerdly tower@ seid chember, emol adapted for
injecting air under pressure into seid chamber
íor testing purpcses„ endmeens for sealing seid
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