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Патент USA US2392087

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Patented Jan. 1, 1946 '
' 2,392,087
UNITED~ STATE 5 PATENT OFFICE
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I
2,392,087
VENT VALVE FOR 'rnamuos'mrrc DEVICES ;
William B. Griffith, some Harbor, N. J.
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Application November 2, 1943, Serial No. 508,723
3 Claims. (01. 297-3)
thermostat, adapted for closing an electric cir-'
My invention relates to improvements in ther
cult, and embodying my invention.
mostatic devices adapted for use in connection
Fig. 2 is a view similar to Fig. 1, of a thermostat,
with ?re protection systems, including apparatus
adapted for operating a mechanical device, and
adapted for closing an electrical circuit,- and for
> operating mechanical releasing devices.
My invention particularly relates to devices
having an air chamber associated with a distend
embodying another form of my invention.
Fig. 3 is a central vertical sectional view or still
another form of my novel vent valve, shown con
nected with a thermostatic device.v
able wall or diaphragm. movable by the pressure
In the drawing, in which like reference char
of expanded air in said chamber upon a sudden
acters refer to like parts, Fig. 1 illustrates my in
increase in the temperature of the air in the event 10 vention'embodied in a thermostat 5, which may
of a ?re in the zone where the device is located.
“be of any well known construction, having a. base
The air chambers are now provided with slow
'6, of insulating material, upon which is mounted
leak vents through which variations in the pres-_
an air chamber 1, comprising a thin heat con
sure or" the air within the chambers may equalize
' ducting metal shell
and a distendable element,
with the atmosphere without distending the dia~
or diaphragm W, the latter forming a wall of the
phragms.
The object of my invention is to provide a ther
mostatic device with means for automatically
closing the air chamber vent and sealing said
chamber upon the occurrence of a ?re.
A further object is to provide a novel vent valve
for automatically closing the vent of an. air cham
‘oer at a predetermined temperature.
A further object is to construct a valve which
is normally movable to vent closing position and
having fusible means adapted for holding the
valve in vent opening position, during normal
changes in temperature, and for releasing the
valve at a predetermined temperature caused by a
?re within the zone where the air chamber is lo
cated, whereby the expanded air will be con?ned
within said chamber for quickly distending the
diaphragm.
I
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further object is to provide a novel valve cas
ing adapted to be mounted upon an air chamber
or connected with the latter, said valve casing
having the air vent ‘formed therein, and means
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air chamber l. The diaphragm it is electrically
connected with a binding screw 02 by a conductor
53 and forms a terminal of an electric circuit.
A terminal screw 55 is mounted upon the base 6
in spaced relation with the diaphragm and is con
nected with a binding screw it, and said screw
iii forms another terminal of the electric circuit.
Said binding screws i2 and it are adapted to
be connected in a ‘circuit ll, including a source of
potential it and an energizable device it. The
diaphragm it is adapted to be distended into con
tact with the terminal iii, by air under pressure
Within the chamber l, for completing the electric
circuit, when the temperature or the air in said
chamber is suddenly increased by the action of
heat caused by a ?re in the zone where the ther
mostat is located.
In the construction of heat actuated devices
having an air chamber and a diaphragm adapted
to be distended by air under pressure it has been
the practice to provide the air chamber with an
adjustable slow ieak vent through which the air
may equalize with the atmosphere during nor
for positively moving the valve to vent closing
position when. the valve is released by the melting 40 mal changes in temperature without distending
the diaphragm. Devices having air chambers
of the fusible means.
with slow leak vents are disclosed in the patents
A further object is to construct the valve cas
ing with an adjustable slow leak vent, and a valve
, to Cuttriss No. 522,972, July 17, 1894, and Himrner
adapted i'cr closing said vent at a predetermined
No. 1,174,149, March 7, 1916.
My present invention consists of providing a
temperature.
45
~ A further object is to provide a‘ retaining mem
‘ ber engaging the valve and fusible means securing
said retaining member positioned for holding the
device having an air chamber with a vent valve
adapted for sealing the vent of the air chamber,
in the event of a ?re, so that the air will be posi
tively retained in the air chamber and the in
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These together with various other novel fea 60 creasing air pressure utilized to distend the dia
phragm and operate the device.
tures of construction and arrangement of the
The vent’ valve 20, as shown in Fig. 1, com
parts, which will be hereinafter more fully de
prises a valve casing 2|, having an axial bore 22
scribed and claimed, constitute my invention.
and an‘ air inlet aperture 23 in communication
Referring to the accompanying drawing?
Fig. l is a-central vertical sectional view of a 65 with said bore and with the air chamber 1.
valve invent opening position.
2,892,087
The casing 2| has a conical valve seat 25 sur
rounding a vent 26 which is in communication
in the pressure of air in the chamber '7 to equal
izegwith the atmosphere without actuating the
with the bore 22 and having an outlet aperture
diaphragm III.
In‘ the event of a ?re in the zone where the
thermostat is located the fusible means '38 will
melt and release the valve supporting member 53
and allow the valve 29 to move, or urged by the
A valve 29 is mounted for movement within the
action of the spring 3|, to vent closing position
bore 22 and is normally movable toward the seat
upon the seat 25, for retaining the air under
25 for closing the vent 28.
Fusible means 30, in the form of soft solder, 10 pressure within the air chamber 1, thus distend
. is provided for retaining the valve 29 in spaced
, ing the diaphragm l0 into contact with the ter
‘relation with the valve seat 25. Said fusible
minal screw i5, for completing an electrical icir
means 30 is adapted for releasing the valve 29
cuit, or operating other well known devices.
Another form of my invention is illustrated in
at a predetermined temperature, whereby the
valve will automatically close upon said seat, and 15 Fig. 2, which comprises a valve casing 50 having
a body portion 5| extending without the shell
form a closure for the vent 26 of the air cham
ber ‘i. A spring 3| is provided for positively urg
52, of the air chamber 53. The casing 50 is se
ing the valve 29 to vent closing position upon
cured to the shell 52 by means of a cap 55 which
is in threaded engagement with a reduced por
the seat 25.
A preferred form of my invention is shown in 20 tion 58 of the body-portion 5|. Said cap is adapt
ed for tightly clamping the shell 52 between the
Fig. v1, in which the valve casing 2| is mounted
cap and the body portion 5|. The cap 55 is pro
within the air chamber 1, with said inlet aper
vided with an air inlet aperture 51 which is in
ture 23 in communication with the chamber 1.
The casing 2| has a reduced end portion 32
communication with the air chamber 53.
,
which extends through an aperture 33 formed 25
The body portion 5| has an axial bore 59 in
through the shell, 8, forming the air chamber ‘I.
which a conical valve 60 is mounted for move
The casing 2| is tightly secured upon the shell
ment to and from a conical valve seat 6|, formed
upon the body 5| and surrounding a portion of
8 by a riveted ?ange 34.
The valve casing 2| is provided with a detach
the bore forming a vent 62-. A spring 94 tends ‘
able cap 35 which is in threaded engagement 30 to move the valve 60 to vent closing position
' 2‘l, communicating with the atmospherewithout I
the air chamber 1, through a slow leak regulat-~
ing device 28, hereinafter more fully described.
with the body portion of the casing 2|.
upon the seat 5|.
.
The valve 29 has a cylindrical axial stem por
The valve 88 is provided with a stem 85 which
tion 35 and an enlarged'?ange 31 located adja
is slidably mounted in the body 5|. Said stem
cent to the conical head forming the valve prop
65 terminates adjacent to the. outer end of the
er. Said stem portion 36 forms a shoulder 38, 55 body 5| and is held in vent opening. position of
located adjacent to a reduced axial stem portion
the valve 60 against the action of the spring
39 and engages the cap 35. Said portion 39 ex
54, by a supporting member 61, which latter is
tends through an aperture formed through the
secured directly to the body 5| by fusible means
cap 35 and is freely movable relatively to the cap.v
68, fusible at a predetermined temperature.
Said spring 3| is interposed between the ?ange 40
31 and the cap 35 and tends to urge the valve
29 to vent closing position upon the valve seat 25.
As shown in Fig. l, the valve 29 is maintained
‘in vent opening position by a supporting mem
ber 43, arranged for engaging a sleeve 44, se 45
curedupon the valve stem portion‘ 39, for hold
The body 5|, of the valve casing, is provided
with a lateral passage forming an air outlet ap
erture 10 which is in communication with the
vent 62. A sleev'e 1|, having an aperture 12, is
adjustably mounted upon the body 5| and lo
cated upon an axis extending at right angles to
the stem 65, to allow the latter to extend through
.the body 5|. Said sleeve ‘II is adapted for com
ing the valve 29 against the action of the spring
3|. The opposite end of the member 43 is de
pressing ?ltering material 13, for regulating the
tachably secured, by said fusible means 30, to
rate of ?ow of air through the outlet aperture
a part of the thermostat which is exposed to 50 ‘Ill, between the air chamber 53 and the atmos- sudden changes in temperature, it is preferably
phere, when the valve 69 is in vent opening po-‘
secured to the inner surface of the shell 8, so
sition.
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that an increase in temperature, due to a ?re,
The thermostatic device shown in Fig. 2, with
will melt the fusible means 30 and release the
which my invention is embodied, consists of said
member 43, which in turn will release the valve 55 air chamber 53, formed by the rigid shell 52. The
29 and allow°the latter to move to vent closing
chamber 53 is connected by a pipe 15 with an ex
position, or urged by the spring 3|, should the
pansion chamber ‘I8, having a distendable wall,
valve, be mounted for movement ‘upon some axis
or diaphragm 11, which latter is adapted for re
out of a vertical position.
leasing levers 18 and 19. The lever 79 is adapted
The valve supporting member 43 may be 60 for rotating a shaft 80, by the action of a weight
formed of spring metal having sumcient resil
8|, when released by the movement of the dia
iency for holding the valve 29 in the open posi
' phragm 11 by pressure of expanded air in the
tion against the action of the spring 3|, thus
chamber 53, responsive to the action of heat ap
eliminating the'necessity of locating the mem
plied to the shell 52. Devices of this character
ber 43 in an exact position upon the shell 8.
are well known in the art.
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The valve casing 2| is provided with said slow
Fig. 3 illustrates a form of my invention simi
leak regulating device 28, which is mounted di
iar to that shown in Fig. 2, with the exception
rectly upon the valve casing 2|. 'Said device 28
that. the valve 88 is held-in vent-opening posi
is of standard construction and comprises a ‘ tion by fusible means 82, which is secured direct
sleeve 46, having an ori?ce 41, in communication
ly to thevalve stem 85 and to the outer end of
with said outlet aperture '21. Said sleeve 46 is
the body 5| of the valve casing 50, thus eliminat
in threaded engagement with the casing 2| and
ing the. use of the supporting members 43 and
is'adapted for compressing ?ltering material 48
61, shown in Figs. 1 and 2.
for regulating the rate of ?ow of air from the
air chamber 1, thereby permitting slow changes
In Fig. 3 the valve casing 50 is shown provided
with a threaded air inlet aperture 83,-for the
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ascaoav
connection of a pipe 84, which is in communica
3
chamber 86, similar to the expansion chamber
T6, shown in Fig. 2, is shown connected with the
movement of the stem by the action of the
spring, and said ‘fusible means adapted to fuse
at a predetermined temperature to release said
plate and permit the valve to close upon said seat.
air chamber 85 by a pipe 81 and said pipe 84.
When the fusible means 82 fuses, the valve
2. In a thermostatic device having a metal
shall forming an air chamber, a distendable ele
I stem 65 will be released from the valve casing
ment adapted to be distended by expanded air
in said chamber responsive to heat, a valve casing
mounted upon said shell, said casing having a
longitudinal bore in communication with said
chamber, a valve seat upon said casing surround
tion with an air chamber 85.. An expansion ‘
50, and the valve 60 will be moved to vent clos
ing position by the action of- the spring 64, thus
retaining the air in the chamber 85 and in the
expansion chamber 86 foroperating a releasing
device, as above described.
ing said bore, said casing having a vent forming
The operation of my invention is as follows:
a communication between said bore at the axis of
The valve casing is provided with an air passage
said seat and the atmosphere without said cham
forming a vent through which normal changes 15 ber, a valve stem mounted for axial movement
in the air pressure within the air chamber may
within said bore, a valve mounted upon said
equalize with the atmosphere, during slow
stem, a spring tending to slide said stem axially
changes in the temperature of the air surround
for closing the valve upon said seat, said stem
ing the air chamber, without distending the dia
having an end portion extending from said cas
phragm. The valve casing is provided with ad 20 ing into said chamber, a valve supporting plate
justable means for varying the rate of flow of
having one end portion extending radially at
the air through the vent so that a sudden in
right angles to the, axis of the stem, means upon
‘ crease in thetemperature, due to a ?re, will cause
said end portion of the stem adapted to be en
the diaphragm to be distended and operate the
gaged by said plate, fusible means securing the
device. Should the increase in temperature be
opposite end of said plate upon the inner surface
slow, due vto a smouldering ?re, the pressure
of said shell, said plate having su?icient rigidity
within the air chamber may equalize with the
for holding the stem against the action of said
atmosphere without distending the diaphragm.
spring for normally maintaining the valve ‘in
My novel vent valve provides means for posi
spaced relation to said seat. and said fusible
tively sealing the air chamber when the fire in 30 means responsive to heat at a predetermined
creases su?lciently to melt the fusible means.
temperature for releasing said plate for move
The fusing oi the iusible means releases the valve
ment of the valve to vent closing position upon
proper for movement to vent closing position,
said seat.
thus retaining the air within the air chamber. A
3. In a thermostatic device having an air
further increase in temperature causes a further 35 chamber, a distendable element adapted to be
increase in the pressure of'the air in. the air
distended by the expansion of air in said cham
chamber, which pressure distends the diaphragm
ber responsive to heat, a valve casing having a
for operating a device adapted for fire protection
bore in communication with said chamber, a
purposes.
‘
valve seat upon said casing surrounding said
Various changes in the construction and ar 40 bore, said casing having a vent in communica
rangement of the parts may be made without de
tion with said bore at the axis of said seat and
parting from my invention.
in communication wtih the atmosphere without
I‘ claim:
said chamber, a valve stem mounted for move
1. In a thermostatic device having a metal
ment upon the axis of said bore, a valve mounted
shall forming an air chamber, a distendable ele
F upon said stem, a spring tending to close the
ment adapted to be distended by expanded air in
valve upon said seat, fusible means supporting
said chamber responsive to heat, a valve casing
said stem with the valve in spaced relation to
mounted upon said shell, said casing having a
said seat and adapted to release the stem at a
longitudinal bore in communication with said
predetermined temperature for movement of the
chamber, a valve seat upon said casing surround 50 valve to vent closing position upon said seat, a
ing said bore, said casing having a vent forming
sleeve upon the casing located in said vent be
a communication between said seat and the ‘at
tween said seat and the end of the vent which is
open to the atmosphere, said sleeve having an
mosphere without said chamber, a valve stem
mounted for axial movement within said bore, a
ori?ce in communication with said vent, and
valve mounted upon said stem, a spring tending 55 means for adjusting said sleeve upon the casing
to slide said stem axially for closing the valve
for varying the size oi’ said vent independently
upon said seat, a valve supporting plate extend
oi’ the position of said valve relatively to said
ing radially at right angles to the axis of said / seat.
stem, fusible means securing said plate posi
tioned upon the axis or the stem for opposing the
WILIJAMB.GRIFFITH.
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