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Патент USA US2113296

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April 5, 1938.
1
v. DuRBlN
FIRE
DETECTING
'
DEVICE
2,113,296
> '
named
2,113,296
s, 193s
UNITED STATES
PATENT - oFFlcE
2,118,296
FIRE DETECTING DEVICE
Vernon Durbin, Newton, Hals., assigner to The
Boitier-Cabot Electric Company, Bolton,
,
Mass.,_acorporationoflhlachllaetts
`Y
Application August 3l, 1934, Serial 110,142,264
24 Claim._ (Clint-188) __
'I'his invention relates to heat responsive de
vices and `especially to fire detecting, alarm-ini
tiating devices.
l
.
,
Theiire detecting device embodying the pres
5 ent invention is adapted to be located within the
zone to be protected in thermal relation with the
ambient atmosphere and so arranged as to be 're
sponsive to and operated by am. abnormal tem
perature condition of the atmosphere to control
l0 an alarm circuit as by either making or breaking
the circuit, thereby to actuate some suitable re
motely located alarm device.
_ .
Since the device may remain in an unoperated
condition over a long period of time and yet, to
l5 perform itsfunction when called upon to do so,
. must be maintained constantly in operative con
dition, an. object of the present invention is to
enclose the operating parts o1' the device including
the heat actuated element within an enclosing
20 casing that is sufllciently tight to exclude from
the operating parts dust and foreign matter that
might impair or prevent the operation of the
. An additional object of the invention resides
in the use of one circuit controlling device for
both heat actuated elements so that the opera
tion of either element or both conjointly-results ‘
in the proper operation oi’ the circuit controlling 5
device.
'
A yet further object of the invention is the
provision ot a ?re detecting device having two
heat actuated elements arranged to cause the
device to respond both to a. predetermined eleva- 10
tion of temperature and an abnormal rate oi.'
rise of temperature, and a casing enclosing both
elements with provision whereby one element re
ceives heat from the ambient atmosphere more
rapidly than the other element and particularly 15
wherein the casing has a part of goo'd thermal
conductivity arranged in contact with one of said
heat actuated elements and wherein the other
element is thermally insulated to an appropriate
degree Afrom the ~iirst element and from the con- 20
ducting part of the casing.
As has been stated above a fire detecting device
of the type with which the present invention is
transfer of heat from the external atmosphere tor concerned is required to stand idle for long periods
of time and yet must operate satisfactorily when 25
25 the internal heat actuated element
subjected to a dangerous temperature condition.
A further object oi the invention is the provi
sion of a fire detecting device including a casing Heretoi'ore the circuit controlling contacts have
` of uncertainty. If the circuit is
having therein a heat actuated element. the cas "been a source
device and at the same time provides an effective
ing having a member of good heat conduction, as normally -open, so that the contacts are main
30 a metal cover, that is exposedto the ambient tained separated for a long period of time, dirt 30
and oxide is liable to accumulate on the contact
atmosphere and serves to transmit heat there
faces and preventl the proper closing of the cir
' ' from to the heat actuated device.
cuit when the contacts are brought together. Ii'
_
A further object of the invention is the provi
& sion of a ilre detecting device having a thermo
35 static bimetal strip -wound in spiral form as the
heat actuating element, the element being en
closed within a casting having a cover of good
heat conducting material and the element resting
_on edge loosely on the cover so that it can move
`40 freely in response »to the heating thereof and so
that the heat of the ambient atmosphere is trans
mitted by _conduction through the cover to the
thermostatic strip.
the circuit is normally closed, so that the‘con
tacts are normally engaged, they are liable to 35
stick together and will not separate when re
quired to do so. Hence a further object oi' the
invention is the provision of a. fire-detecting de
vice wherein the circuit controller has its con
tacts enclosedwithinasealedcasing thatis40
evacuated or contains an inert atmosphere so
that 'complete reliability of operation over in
definitely long periods is assured.
Specifically
Complete protection against nre in a zone the circuit controller is of the mercury contactor
45 supervised by a device oi.' the present invention re ,type wherein the spaced circuit electrodes are 45r
quires that the device be responsive both to a sealed within an evacuated casing or one contain
« predetermined elevation of temperature and also ing an inert atmosphere and wherein a mobile
bodyofmercuryiscausedtobridgeandalso
to an excessive ratevoi.' rise of temperature re
disconnect the electrodes upon the tilting of the l
gardless of the elevation thereof. Hence a fur
casing in opposite directions, the casing being 60
60 _ther object of the present invention is the provi
sion of a ñre detecting device having an improved tilted by movement of the heat actuated element.
’ construction that includes two heat actuated ele
_ments that cooperate' to respond to a predeter
mined „elevation of temperature and also to _an
u ‘abnormal rate of rise thereof.
A further-.object of the invention is .the provi-- -
sion of a nre detecting device including two heat
actuated elements having movable ends on and
between both of which a carrier for the contacter ß
arranco
casing `is fulcrumed, the arrangement being such
provide a suitable time lag or delay in the oper
that the movement of either one element relative
to the other causes the tilting of the >carrier and
other, as will be explained hereinafter. A cylin
the operation of the contactor.
A yet further object is generally to improve the
construction of ñre detecting, alarm-initiating de
A vices in details that are important from the stand
point of reliability of operation and of economical
manufacture and assembly and freedom from un
10
authorized manipulation.
'
.
Fig. 1 is a side elevation of the fire detecting
device of the present invention in installed posi
tion.
’
Fig. 2 is a plan view of the device of Fig. l.
15
Fig. 3 is an enlarged plan view of the device of
Fig. l with the cover removed.
Fig. d is a section taken along line ¿_i of Fig. 3.
Fig. 5 is a side elevation of the device with the
Acasing partly broken away to illustrate the cir
20 cuit controller which as here shown is in an un
operated or open circuit condition.
Fig. 6 is a sectional view similar to Fig. d but
showing a modiñcation providing increased heat
insulation between the two heat Vactuated ele
ments.
Fig. ‘7 is a side elevation of the device with the
casing partly broken away to illustrate the man- ner of loosing the cover against rotation.
Fig. 8 is a perspective view oi an adjustable
stop member for one of the heat actuated cle
ments.
4
Fig. 9 is a diagram of the circuit controller il
lustrating the manner in which the controller op
erates when the top heat actuated element is
ation of one heat-actuated element over the
drical boss 40 is integral and coaxial with and
projects below said disc 38 and partially exter
nally of the recess and constitutes a. support and
anchorage for the inner end of the lower hea-t ac
tuated element 42. Said element 42 comprises
a thermostatic strip consisting of two metals ‘2a
and 4211, see Fig. 12, having dissimilar coeillcients l0
of heat expansion secured together back to back.
Said strip is formed into spiral coniiguration and
. has a radially inwardly extended ñxed inner end
54 and a radially outwardly Iextended movable
end 46. The inner end is received within a longi
tudinally extended slot in the boss 40 and thereby
is anchored against rotation. The ilrst or inner
most convolution 48 of the spiral is preferably of
circular configuration so that it overlaps and
presses against the inner end of the strip and 20
thereby holds it in the slot against escape there
from without the necessity for other securing
means. The open recess 28 of the base is closed
by a cover 50 which preferably is cup shaped hav
ing a flat bottom wall 52 and an upstanding‘ clr 25
cular side wall 54 which closely fits within the
recess of the base sufficiently tightly to exclude
dust and other deleterious foreign matter from
entering the casing. The bottom wall 52 of the
cover overlies and bears against the end face of 30
the hub ¿c and is secured thereto by a screw 56
which is screw-threaded in the boss, the screw
having an enlarged thin head 58 which overlies
the cover and has a pair of wrench receiving ap
stationary and the lower heat actuated element ertures BG therein in which the prongs of a suit- .
is moving under the influence of heat.
>able wrench can be inserted for the purpose of
Fig. i0 is a view similar to Fig. 9 but illustrating - rotating the screw. lifter the screw has been in
serted it is locked in position by a pin 62 which
is passed through one of said wrench holes 60 and
40' same rate.
dri-ven into the end of the boss 40. A rating plate 40
Fig. il is a View similar to Fig. l0 but illustrat
66 is then sprung permanently into a cup shaped
-ing the position of the circuit controller after the recess formed in the outer face of the head of the
top heat actuated element has been arrested in screw and overlies the pin 62 and permanently
advanced position and the lower heat actuated -prevents its removal so that the screw can not be
45 element has moved further to actuate the cir
removed subsequently by an unauthorized per 45
cuit controller.
son. The cover 50 is locked against rotation on
Fig. l2 is an enlarged plan view of a portion of the screw 56 additionally to the pin 62 by a
the position of the circuit controller when both
heat actuated eiements are moved at about the
a heat actuated element and illustratingr the-bi
metal construction thereof.
The lire detecting device embodying the pres
50
ent invention comprises generally a casing il
containing the operative elements of the device.
The device is adapted to be secured in any> de
sired location in a room preferably on the ceiling
55 I6 thereof and may be attached to and form the
tongue 63 formed at the edge of the supporting
plate 34, which tongue is located within a notch
65, see especially Fig. 7, formed in the edge of 50
the side wall 54 of the cover, the tongue thereby
acting as a key to prevent the cover from rotat
ing and loosening the screw 5€.
.
The cover 5U, in accordance with this invention,
is composed of some metal, as copper, that'has
cover of a junction box i8 through which con
high thermal conductivity so that the rate of heat
ductors 20 of an alarm circuit are extended. The transmission through it from the atmosphere
casing comprises a base 22 preferably circular in surrounding the device is rapid. 'I‘he heat actu
configuration having a flat top face 2l and com
ated element 42 has its lower face substantially
60 posed of some suitable electrically insulating ma- - ñush with the top of the boss Il and hence rests
terial as a molded artiñcial resin. The casing isV upon -and is in direct metallic contact with the
provided with a generally circular recess 26 open ' inner face of the metal wall 52 ofthe cover 5l.
at the bottom and adapted to receive the operat
The heat actuated element is suported only at its
ing elements of the device. The base is formed center and. due toits spiral conñguration and
65 with an integral ledge 2l which projects into the
recess from one side'thereof and carries sets of
circuit terminals Il -and 32. A plate 3l of suitable
_ heat insulating material is secured to the top
face of ~said ledge 28 preferably removably by
70 screws 36 and projects into thec recess 2l in
Said
spaced
plate
relation
at its
with
inner
the end
top wall
terminates
24 of the
in a cir
cular heat insulating disc _3l whichis disposed
coaxially of the recess and is integral with the
75 plate andis of suitable area and thickness to
the long length of the strip composing it, is axial 65
ly flexible so that it can rest by its weight upon
the cover and yet expand and contract freely
while in contact with the cover. Due to the me
tallic contact between the element and the heat
collecting cover the heat of the ambient atmos 70
phere is transmitted through thecover rapidly
to the heat actuated element wherebyto cause it
to assume an expanded condition dependent upon
the temperatm'e of the atmosphere. A second
heat actuated element ’l whichmay be and pref u
aliases
erably is substantially identical with the lower
heat actuated element 42 is disposed in the `upper
part of the recess 28 of the base on the top side
o! the insulating plate 84. A metal stud I8 is
molded in_to the disc 88 of said insulating plate
and projects upwardly in the axial line of the re
cess 28. A metal hub 18 is received rotatably
loosely on said stud and is in engagement with
3
so that these elements remain clean and in op
erative condition indefinitely. With this type of
circuit controller the proper operation thereof is
assured even after years of inactivity and thus
the ilre detecting device is reliable to a degree not
readily attained by the usual type of circuit con
troller having exposed separable solid contact
the inner end of the upper heat actuated element
in the same way that the boss 48 engages the in
ner end of the lower element I2. A washer 12 is
disposed on top of the stud and a nut 14 is screw
threaded thereon to exert pressure against the
washer and hub andclamp the hub upon the
15 insulating supporting plate M. 'I'he top face of
the hub is provided with a pair of diametrically
opposed-slots 16 and the washer is formed with
corresponding slots adapted to receive projec
members. 'I‘he circuit controller is mounted in a
carrier which comprises a vertically disposed in
sulating block 88 having a hole through the mid
dle thereof in which the tube 80 is frictionally
retained. 'I'he top and bottom ends of the block
are provided with V shaped notches 9|! in which
the movable ends 48 and 82 of the lower and up
per heat actuated elements respectively are locat
ed. The confronting edges oi said ends engage
and fulcrum in the bottoms oi’ the notches and
bear with a slight tension against the block by
tions oi' a tool to hold the hub and hence the heat
20 actuated element 88 againstí rotation while the
nut 1l is being rotated to clamp the hub in ad
justed position. 'I‘he stud 88 and the nut 'M_
thereon projects upwardly through a hole 'I8 in
the top wall 2l of the insulating base so that the
setting of the upper heat actuated element can
be made readily. The upper heat actuated ele
ment is spaced from the lower element and from
the cover 58 and is insulated from both by the
heat insulating discs 88 and hence receives heat
30 by radiation from the cover more slowly than the
lower element 42». When the device is subjected
to a rise in temperature that is so slow that the
rise is not ordinarily caused by a nre condition
the temperature oi' -the top element closely fol
35 lows the increase in ambient temperature so that
the two elements expand at about the same rate
and thus do not become operative to initiate a
warning signal. When, however, the ambient
temperature rises so rapidly as to indicate the
40 probability of a dangerous lire condition the lower
heat actuated element becomes heated faster and
thus expands more rapidly than the upper ele
ment and hence causes the control of the sig
nal circuit to initiate a warning signal. The dif
45 ference in the rate of heating of the two elements
and hence the time lag of expansion between
them in response to a rise of temperature can
be varied by varying the thickness of the insu
lating supporting plate 8l and by the amount of
the inherent axial resiliency of the heat actuated _
elements due to the spiral conilguration thereof. 20
The ends of said elements are retained in said
notches against accidental displacement there
from by retaining pins 84 which are frlctionally
retained in the carrier 88 and traverse the
notches and pass loosely through relatively large
clearance holes in the ends 48 and 98. The cir
cuit terminals 82 and M are electrically con
nected to conductors 98 and 88 which are at
tached to the carrier 88 and then extend loosely
to the terminals 38 and 32 respectively of the de 30
vice. The conductors are suiiicientiy slack be
tween said carrier and the terminals so as to
permit unrestricted angular movement of the
heat actuated elements and the tilting of the
controller within the required range. The angu 35
lar displacement of the free end 92 of the up
per heat actuated element 88 is limited for
the purpose of defining the elevated temperature
at which the device shall operate its circuit con
troller. To this end the device is provided with 40
a stop member or arm comprising a plate |00, see
Figs. 3, 4 and 8, which is capable of angular
movement about the stud 88 under the hub 18 and
is clamped in set position by said hub against the
supporting plate M. Said plate |00 is provided 45
with an upwardly extended end portion I 82 which
bears trictionally against the inner face of the
wall I6 of the base 22 by the inherent resiliency
of the plate, thereby cooperating with the clanïp
ing action of the hub 18 in holding the plate in set 50
ments. In Fig. 6 a modiñed form of plate “a position. The end |82 is provided with-an ex
tension IM that is adapted- to be engaged by the
is illustrated wherein the disc 88a is approxi
mately as _large in diameter as the diameter of -free end of the upper heat actuated element or,
more precisely, by the.upper end of the circuit
the spiral heat actuated elements I2 and 88 there
55
controller carrier 88 whereby to limit the ex
55 by to provide a greater time l'ag of heating and~
pension
movement
of
the
upper
heat
actuated
operation of the >two elements than is provided
by the smaller area of the disc illustrated in element and thereby eil'ect 'the operation of the
50 area of said plate interposed between the ele
Fig. 4.
,Y
.
'I‘he two actuated elements are arranged inde
60 pendently and also conjointly to control a cir
cuit controller. Said circuit controller is of the
so-called mercury contactor type and comprises
an elongated cylindrical `sealed enclosing casing
88 composed oi' glass or the like having its circuit
terminals 82 and 84 sealed in one end of the tube
and projecting in spaced relation into the interior
thereof. The tube contains a small mobile body
" of mercury 88 that, when thetube is inclined in
one direction, occupies one end of the tube and
70l"is in vcontact with and electrically bridges the
terminals and, when the tube is inclined in the
opposite direction, leaves the terminals and runs
circuit controller in response to an elevation of
temperature determined by the setting of said
stop arm.
The operation of the device is essentially as
follows: The normal position of the heat actu
ated elements can be ,as illustrated in Fig. 3 and
in the full lines of Fig. 9. When the ambient
temperature rises both heat actuated devices are 65
influenced by the increase of temperature and
are caused >to expand in a direction to increase
the lengths of their spirals. If the rise of am
bient temperatrn'e is relatively rapid the lower
heat actuated-device expands more rapidly than
the upper one since it is more directly influenced
by the heatwhile the upper element, being rela
into and occupies the other end of the tube. >The ' tively insulated from the heat, expands more
. tube is evacuated or contains a gas that is inert
75 with respect to the mercury and the electrodes
60
slowly._ IThe result ultimately is that the lower
end of the carrier 88 advances more than the up
4
per end thereof so that the upper end fulcrums
upon the free end of the upper element and causes
the tilting of the tube 80 in a direction to cause
the mercury to run into the terminal end of the
tube and bridge the terminals 82 and M and
thereby complete the circuit through said ter
minals to eiîect the initiation of an alarm signal.
If the rise of temperature is so slow that both heat
actuated elements expand practically simultane
10 ously the circuit controller will be advanced in the
manner indicated in Fig. 10 but without change
in the relative disposition of the free ends of the
elements sov that the circuit controller will not be
tilted and operated. If the slow rise of tem
15 perature continues until the temperature eleva
tion is sufficiently great, however, the advance of
the free ends of the elements will continue until
the upper end of the carrier 88 is brought into
engagement with the projection IM of the arm
20 |00. Further advance ofthe top of the upper
element is thus prevented. The lower element,
however, will continue its advance and in doing
so will tilt the tube- W into the position illus
trated in Fig. 11, therebyl causing the mercury
25 body to run into the lower end of the tube and
bridge the circuit terminals 82 and I4 in the
manner above described, thereby initiating an
alarm signal as a result of the elevation of tem
perature regardless of'the slow rate oi' increase
30 of temperature.
I
claim:
’
_
.
»
l. A ilre detecting device including a pair of
thermo-'responsive elements. a dust tight casing
enclosing said elements and isolating them from
35 the ambient atmosphere, said elements being
equally freely exposed to the atmosphere within
said casing, and a signal initiating device as
sociated with said elements, said casing having
a heat-transmitting wall exposed to the atmos
phere surrounding said casing and adapted to be
come heated by exposure to the atmosphere and
heat the interior of said casing, and one of said
elements being disposed nearer than the otherl
element to said wall so that it is more immediately
responsive to th'e atmosphere externally of said
casing.
rounding and carried by said hub having a free
outer end and an inwardly directed end that is
located in said slot, said slot opening into the
end face of said hub, a' washer on said stud upon
said end face and overlying said slot, and a
clamping nut screw-threaded on said stud and
bearing on said washer.
5. A ilre detecting device as deiined in claim 4,
said hub and washer being larger in diameter
than said nut and having registering wrench en 10
gaging notched portions by which said hub and
the thermostatic spiral carried thereby can be
shifted angularly on said stud whereby said spiral
and nut may be relatively rotated while one is
held stationary.
6. A ilre detecting device comprising a support
having a projecting stud. a thermostatic spiral
15
having an inner hub rotatable on said stud, a
clamping nut screw-threaded onA said stud and
bearing on said hub, said spiral having a free 20
outer end, signal initiating means associated with
said outer end, and a limit arm located between
said support and hub and angularly shiftable on
Said stud having an end disposed in the path of
travel of the free end of said spiral.
25
'1. A nre detecting device comprising an enclos
ing casing having a recess, a support in said re'
cess having a boss outstanding from said support
in one direction and a stud outstanding from said
support in the opposite direction, a thermostatic 30
spiral carried by said boss, a second thermcstatic
spiral having a hub rotatable on said stud. said
spirals having free outer ends, a circuit con
troller associated with said free ends, and a re
allient limit arm pivoted on said stud between' 35
said hub and ‘support having a free end bearing
yieldingly upon and movably over the bottom of
said recess in the path of movement of the freeend of one of said thermostatic spirals to limit
the movement lof the free end of one only of said 40
spirals, whereby to eifect the operation of said
Icircuit controller, and a nut screw-threaded on
said stud which clamps said arm in set position
between said support and hub.
8. A nre detecting device comprising a support.
a' thermostatic spiral having its inner end pivot
2. A fire detecting device including an enclos j ally mounted on said support and having a free
ing casing having a heat conducting wall ex
outer end, a limit arm pivotaliy mounted on said
posed to the atmosphere vsurrounding said cas
support concentrlcally with said spiral having
ins, a pair of heat responsive elements located asend portion dispom in the path of movement
within said casing one adjacent and the other of the free end of said spiral, clamping means for 50
remote from said heat conducting wall and re
securing both said spiral and said arm in prede
ceiving heat from the atmosphere only by trans
mission through the material of said wall. said
55 elements being equally freely exposed to the at,
mosphere within said casing. heat insulating
means carried by the casing independently of and
interposed between said elements, and signal in
itiating means associated with said elements.
3. A fire detecting device comprising an en
closed casing having avheat conducting wall ex--Í
posed to the »atmosphere externally of the device
for transferring heat from the exterior to the in
terior of the casing, a-pair of >thermo-responsive
elements located within said casing and both be
ing approximately equally freely exposed to the
atmosphere within the casing, one of saidl ele
ments being adjacent and the other remote from
- said wall, and a heat insulating barrier interposed
70 between said wall and said- more remote ele
ment.
-
'
4. A fire detectingl device comprising a support
having a projecting stud,l a hub angularly mov
able on said stud having a longitudinally directed
75 slot in its outer face, a thermostatic spiral sur
termined adjusted podtions. means permitting
angular adjustmenttof said arm and spiral each
without
ent of the other, and signal in_ 55
itiating 'means associated with the free end of
said spiral.>
~
~
_ 9. A iire detecting device comprising a support
ing plate. a support therefor engaged with one -
end of said plate, the other end of said platehav
ing a. bou projecting in one direction laterally
therefrom and a projecting stud that is co-axial
with said boss and projects in the opposite direc»- v
tion therefrom, a thermostatic spiral having its
inner end carried by said boss and‘having a free
outer end, a second thermostatic spiral having
an inner hub rotatable on said stud and having a
free outer end, a _nut sc
-threaded on vsaid
stud and bearing on the end of said hub to clamp
it to said supporting plate, and signal initiating 70
means associated with the free ends of said
spirals.
,
10. A nre detecting device ’comprising a base
having a recess, a supporting plate ilxed to said
base having a part that projects into said recess 75
5
9,113,296
and has a boss, a thermostatic spiral in said re
cess on said boss and having a free outerxend, a
metal cover plate for said recess parallel toand
in contact with the edge of the convoluticns of
said spiral, means securing said plate in the afore
said relation to said b'oss, and signal initiating
means associated with the free end of said spiral.
11.'A thermo-responsive device comprising two
thermo-responsive members responsive at diiïer
10
ent rates when subject to the same operating
temperature and movable in the same direction
by substantially the same amountwhen the op
erating temperature is slowly changing and mov
able by substantially different amounts when the
operating temperature is rapidly changing, and a
15
circuit controller associated Ywith said. members
and movable with both of them and also with
any one of them, said‘circuit controller having
means by which its movements with both mem
20 bers moving in the same direction by the same
amount is ineffective to control a circuit and by
which itis eil'ectively operated only when the
position of one member changes by a predeter
mined amount with respect to the other member.
12. A ilre detecting device comprising two mov
25
able thermo-responsive members responsive at
diiïerent rates to a common temperature, a car
rier disposed between and iulcrumed on both
'members and arranged to tilt when one of said
30 members becomes displaced more than the other
member and to be bodily displaced without tilting
when both members are displaced by the same
amount in the same direction, and a mercury
35
contactor carried by and tiltable with said carrier.
13. A nre detecting device comprising two ther
mostatic strips having iixed ends and free ends
that are movable in the same direction when
said strips‘are >subjected to elevated tempera
lture, a tiltable carrier disposed between and ful
40 crumed on both free ends of said strips and
' adapted to tilt upon said strips when one strip
advances ahead of the other, a circuit controller
responsive to the tilting of said carrier, and a stop
member for limiting the movement of one oi said
strips.
`
.
'
14. A tire detecting device comprising two
thermostatic strips having _fixed ends that are
movable in the same direction when said strips
are subjected to elevated temperature, a tiltable
carrier disposed between and fuicrumed on both
50
free ends of said strips and adapted to tilt upon
said strips when one strip advances ahead of the
other, a circuit controller responsive to the tilt
ing of said carrier, a stop member for limiting
stantially displaced with respect to the other, a
circuit controller responsive to'the tilting only
ot said carrier, and> a stop member for limiting
the amount of movement of one spiral only.
17. A nre detecting device comprising two con
centric parallel thermostatic spirals having free '
ends, a carrier disposed between and Iulcrumed
on both free ends, said carrier being movable
with said free ends without tilting when both
move together simultaneously and said carrier 10
tilting on said ends when one of them becomes
substantially displaced with respect to the other,
a circuit controller responsive to the til..ng only
of said carrier, a stop member for limiting the
amount of -movement of one spiral only, and 15
means for relatively insulating that spiral from
the heat which influences the other spiral.
18. A nre detecting device comprising two con
centri'c parallel spaced thermostatic spirals hav
ing fixed inner ends and movable confronting
20
outer ends, a carrier interposed between and car
ried by and tiltable on both free ends, and a
mercury contactor tube carried by and tiltable
with said carrier.
-
19. A ilre detecting device comprising two con
25
centric parallel spaced thermostatic spirals hav
.ing ilxed inner ends and movable confronting
outer endsz a carrier interposed between and car
riedv by and tiltable on both free ends, a mercury
contactor tube carried by and tiltable with said 30
carrier, and means for limiting the movement oi’
the end of one spiral.-
,
20. A iire detecting device comprising two con
centric parallel spaced thermostatic spirals hav
ing ñxed inner ends and movable confronting
outer ends, a carrier interposed between and
carried by and tiltable on both free ends, a mer
cury contactor tube carried by and tiltable with
said carrier, means for limiting the movement of
the end of one spiral, and means for relatively 40
insulating that spiral from the heat that in
ñuences the other spiral.
21. A fire detecting device comprising a base
having a recess, an insulating plate carried by
said base and projecting into said recess, a pair 45
of thermostatic spirals disposed in said recess
and carried by said plate on opposite sides thereof
and having free outer ends, a carrier interposed
between and carried by and tiltable on both free
ends, a mercury contactor tube carried by and 50
tiltable with said carrier, stop means for limiting
the free movement of the end of one of said
spirals, and a heat conducting cover for 4said re
cess enclosing said spirals and disposed in heat
55
conducting contact with one of said spirals.
22. A fire detecting device comprising a base
having a recess, an insulating plate carried by
said base and projecting into said recess, a pair
strip.
of thermostatic spirals disposed in said recess
15. A nre detecting device comprising two con
and carried by said plate on opposite sides there
centric
parallel
thermostatic
spirals
having
free
60
ends, a carrier disposed between and fulcrumed of and having i’ree outer ends, a carrier inter
on both free ends, said carrier- being movable posed between and carried by and tiltable on
with said free ends without tilting when both both free ends, -a mercury contactor tube carried
move together simultaneously and said carrier by and tiltable with said carrier, stop means for
limiting the free movement of the end of one of es..
65 tilting on said ends when one of them becomes
substantially displaced with respect Ato -the other, said spirals, and a heat conducting cover for said
and a circuit controller responsive to the tilting recess disposed close to one only of said spirals.
23. A iire detecting device including a pair of
only of said' carrier.
.
'
thermo-responsive elements, a dust tight casing
1_6. A fire detecting device comprising two con
centric parallel thermostatic spirals having free enclosing said elements and isolating them from 70.
70
ends, a carrier disposed between and fulcrumed the ‘ambient atmosphere, said elements being
on both free ends, said carrier beingv movable with equally freely exposed to the atmosphere within
said free ends -without tilting when both move said casing, said casing having a heat-transmit
together -simultaneously and said carrier tilting ting wall exposed to the atmosphere surrounding
vsaid casing and adapted to become heated by 75
on said ends when one of them becomes sub
75
55 the movement of oneof said strips, and means
for relatively- insulating the strip of restrictive
movement from the heat that influences the other
6
anasmeA
exposure to the atmosphere and `to heat the
interior oi' the casing, and one of said elements
being disposed nearer than the other element to
said wall and being in direct heat conducting
contact with said wall so that it is more im
mediately responsive to the atmosphere exter
nally of said casing.
4
- 24. A thermo-responsive device comprising a
10
pair of thermo-responsive elements approximate
1y equally exposed to receive externally applied
heat and both approximately equally responsive
to the same temperature, and a heated element
to the temperature of which said thermo-respon
sive elements are responsive, said heated ele
ment being in direct thermal contact with one
thermo-responsive element to cause that thermo
responsive element to be more promptly respon
sive than the other to the temperature of said
heated element, the contact being loose to per
mit movement ot the' thermo-?esponsive ele
ment, and signal initiating means associated
with said thermo-responsive elements.
VERNON DURBIN.
10
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