Thermostatic Fire-Extinguishing Device Page: 3 of 5
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1,143,762
to balance the working pressures in an effec-
tive manner. It will be understood, how-
eyer, that when the flow of fluid through
the by-pass to the chamber 12 is cut off, a
5 preponderance of pressure will be estab-
lished in the chamber 13, resulting in an
upward movement of the diaphragm within
the casing 6 and the opening of the valve 4
for the discharge. of the extinguishing fluid
10 from the pipe 1 through the sprayer or
nozzle 3.
The tube 19 has a guiding and supporting
extension 20 of reduced diameter and pro-
vided with a valve seat 21 and a vent or re-
15 lief outlet 22. A valve 23 is arranged to
close upwardly against the seat 21, against
which it is held by a spring 24, to normally
confine the fluid within the chamber 12 and
prevent its escape. This valve has a de-
20 pending portion, or guide member 25 which
is movable in the guide way 18 and is
adapted to control the port 17 to cut off the
flow of fluid therethrough under certain con-
ditions. When the valve 23 is moved down-
a5 wardly to open the outlet 22 and close the
port 17, the flow of fluid pressure into the
chamber 12 will be cut off, and en the en-
suing upward movement of the diaphragm,
wherein the discharge valve 4 is opened, a
30 proportion of the fluid contained in the
chamber 12 is allowed to vent through the
opening 22 to prevent resistance to the up-
ward movement of the diaphragm.
A thermostatic device is provided.for con-
35 trolling the double valve 23-25, and com-
prises a bracket 26 formed with a tubular
portion.27 at its base embracing the part 20
and secured thereto by a set screw 28. The
bracket is in the form of an open oblong
40 rectangular frame and has arranged therein
a thermostat 29 composed of a pair of super-
posed corrugated metallic disks peripherally
connected to fori a chamber in which is in-
closed a volatile liquid and expansive agent
45 which, when exposed to heat, will volatilize
or expand and fore the two disks apart.
The upper disk has centrally fixed thereto
a threaded rod 30 which adjustably engages
a threaded bore 31 in the upper arm of the
so bracket and is adapted to be secured in po-
sition by a lock nut 32. A vertically mov-
able stem 33 has its upper end disposed be-
low the center of the thermostat and its
lower end secured to the valve 23, said stein
55 passing through a' restricted guide bore 34'
at the upper end of the extension 20 of the
valve casing 19, the construction being such
that upon the expansion of the thermostat
the stem 33' will be engaged and forced
00 downward, thus moving the valve 23 away
from its seat 21 while at the sime time de-
pressing the valve member 25 to close the
port 17, it being understood, of course, that
the thermostat may be conrstrumcted to ex-
45 pand to a working degree at. any desiredtemperature. A spring 84 surrounds the up-
per portion of the stem between the upper
end of the extension 20 and guard or shield
35 fixed to said stem and coc operates with the
spring 24 to hold the valve 23 seated and the 70
depressible stem in normal position until the
thermostat is positively expanded to the re-
quired degree to actuate the valves, said
springs serving also after operation of the
parts and contraction of the thermostat to ?6
return said parts to normal position. The
guard or, shield 35 is in the form of a con
cavo-convex disk arranged to intersect. and
shield, the . thermostat from any small
amount of water which may jet. through the so
bore 34' during the exhaust of water from
the chamber 12, thus preventing cooling and
contraction of the 'thermostat during the
time the device should be positively and re-
liably in action for the'discharge of the' ex- 85
tinguishing fluid through the sprayer nozzle
3. Any suitable 'kind of alarm circuit may
be employed in connection with the appa-
ratus for the purpose of sounding an alarnm
when a fire breaks out and the apparatus is 90
set into operation. In 'the present instance
a circuit is shown comprising conductors 36
and 37, a battery or other suitable source of
electric supply 38 and a bell or other alarm
device 39, said conductors being connected 95
respectively with the thermostat and the
stem 33 or some other. suitable part of the
valve of the connections for operating' the
valve 23 from the thermostat, which are
suitably insulated from each other and 100.
adapted upon, the expansion. of the thermo-
stat to be coupled to energize the alarm cir-
cuit and' sound the alarm.
-It will, .of course, be understood that the
apparatus may be supported and arranged 105
in any suitable manner at the point .to be
protected, and that the valves 4 and 23'are
normally maintained in closed position and
the valve 25 in open position, while the ther-
mostat is .set for expansion at a predeter- 110
mined temperature, to open the relief valve
23 for.the purpose of setting the apparatus
into operation when a fire breaks out 'at or
near the protected point and the tempera-
ture rises to such degree.. Upon the.e'xpan- 115
sion of the thermostat when a fire breaks
out, the stem 33 is dpressed, the valve 23
opened and the valve 25 closed, whereupon
an' increase of pressure in the chamber 13
ensues by which the diaphragm in the cas- 120
ing 6 is elevated and the fluid displaced in
the chamber 12 and allowed to vent through
the outlet 22. The valve 4 will thus be
opened for the discharge of t1e extiugimish-
ing fluid from the pipe I through the 12.
sprayer 3. At the same time the expansion
of the diaphragm will close the electric cir-
cuit and sound the alarm. When the lire is
extinguished and the temperature again
falls, the thermostat contracts and the vglve 180s
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Reference the current page of this Patent.
Hooks, J. J. Thermostatic Fire-Extinguishing Device, patent, June 22, 1915; Washington D.C.. (https://texashistory.unt.edu/ark:/67531/metapth858048/m1/3/: accessed July 18, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.