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Патент USA US3070164

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Dec. 25, 1962
K. PORLAND
3,070,155
THERMO-ELECTRICALLY GAS SHUT~OFF UNIT WITH SAFETY PILOT
Filed Feb. 1'7, 1959
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2 Sheets-Sheet. 1
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Dec. 25, 1962
K. PORLAND
3,070,155
THERMO-ELECTRICALLY GAS SHUT-OFF UNIT WITH SAFETY PILOT
Filed Feb. 17, 1959
2 Sheets-Sheet 2
a:
H9 7
24
H98
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23
Unite
Patented Dec. 25, 11962
1
2
3,070,155
stern in the direction away from the disc of the inlet valve
is limited by a cam disc permanently secured in the eas
WiTI-I SAFETY PHLOT
ing of the unit and having a working surface facing the
inlet valve and cooperating with a guide pin project
THERMO-ELECTRICALLY GAS SHUT-OFF UNIT
Kjeld Porland, Elsrnark, Nordborg, Als., Denmark, as
signor to Danfoss ved ingenipr Maris Clausen, Nors
borg, Denmark, a Danish ?rm
Ii,"
3,070,155
States ' *
Filed Feb. 17, 1959, Ser. No. 793,825
Claims priority, application Denmark Feb. 21, 1958
9 Claims. (Cl. 158-131}
ing radially from the stem when the stem is turned away
from its inoperative position; furthermore, between the
disc of the outlet valve and the casing there is provided
a closing spring which forces the disc against its valve
seat and between a collar provided on the stem and the
10 casing is placed an opening spring which is more power~
This invention relates to a thermo-electrically con~
ful than the closing spring and presses the guide pin
trolled gas shut-off unit with safety pilot, preferably for
against the working surface of the cam disc. The said
use in connection with a washing machine or a similar
stem has further a contact member cooperating with
gas comsuming apparatus and of the kind in which the
the disc of the outlet valve so as to displace the said disc
said unit has an inlet valve which in its open position 15 when the stem is turned away from its inoperative posi
is retained by an electromagnet, the said electromagnet
tion.
overcoming the action of a spring and receiving current
As a result, the flow ‘area of the outlet valve may be
from a thermo element which is in heat transmitting cone
varied by turning the stem in relation to the permanently
nection with a pilot burner, and is furthermore provided
with a manually operable outlet valve inserted in series 20
In accordance with a third feature of-the gas shut-off
with the main burner.
unit according to the invention the angular movement
Gas shut-off units of the aforesaid kind are known
of the stem is limited, partly by means of a projection
and they are normally installed in series with an extra
formed on the handle of the stem, partly by means of
shut-off device for the gas piping; the said shut~off device
a stop plate which is mounted on the stem and provided
may be designed as a main cock with a plug. Quite 25 with another projection, the said projections cooperating
apart from the fact that such a main cock is liable to
with a stop placed on the casing.
become leaky by very intense use and to become jammed
As a result, the inoperative position of the stem in
mounted
disc.
'
‘
‘
‘
by less intense use, such an extra main cock is a com
which the cam disc relieves the stem of the pressure
plication since it has to be operated by the user in a
de?nite succession in relation to the pilot burner valve
and therefore in many cases is mechanically coupled to
the latter, and in any event it means increased cost of
the total installation.
It is the object of the present invention to devise a
gas shut-off valve in which these drawbacks are elimi
nated. This is accomplished by the gas shut-oif valve in
exerted by the opening spring, is well de?ned thereby
accordance with the invention thereby that the manual
ly operable outlet valve consists of a spring-loaded disc
valve which is coaxial with the inlet valve and has an
axially displaceable stern.
In the inoperative position
of the unit the said disc valve closes a room, which is
furthermore limited by the inlet valve and has a dis
charge opening leading to a pilot burner valve built to
gether with the shut-off unit and inserted in series with
the pilot burner, the stem of the outlet valve being
adapted to open the inlet valve by displacement in rela
ticn to the disc of the valve in the direction opposite the
direction in which the outlet valve opens.
As a result, an extra shut-off device is rendered super
?uous since the outlet valve in the inoperative position
of the unit closes the supply to the main burner, but not
to the pilot burner, in addition to which the stem may
be operated manually so as to open for the gas supply
that the projection on the handle rests in contact with
one side of the stop and that the ?ow area of the outlet‘
valve may be ?xed by means of the projection on the
stop plate.
in accordance with a fourth feature of the gas shut
oif unit according to the invention the projection on the
handle is disposed in such manner in relation to the
guide pin of the stern that the said guide pin lies in a
?rst notch in the cam disc when the said projection is
resting in contact with one side of the stop, the notch
40 being of such depth that the collar of the stem is clear
of the disc of the outlet valve.
‘
As a result, the outlet valve is closed in the inopera-_
tive position of the stem and the side edges of the notch
press the stern into place in its one extreme position so
0 that the stem can only be removed from the said extreme
position by exerting a certain manual force to turn the
handle, which provides security in case children should
try to operate the handle or if the handle is turned uh?
intentionally.
In accordance with a ?fth feature of the unit according
to the invention the cam disc has another notch which is
so disposed in relation to the inoperative position of the
stem that the guide pin by a predetermined ?rst angular
movement of the stern owing to the pressure exerted by
the opening spring is forced into the said second notch
According to one feature of the gas shut-off unit ac
which is of such a depth that the collar provided on the
cording to the invention the disc of the outlet valve is
stem passes the disc of the outlet valve to full opening of
provided with a sealing plate of resilient material which
the outlet valve. As a result, the said valve admits, on
is bent about such edge portion of the disc as faces the
the continued turning of the handle, a full flow of the
stern and is resting in close contact with the stem.
60 gas to the main burner of the installation.
As a result, e?icient sealing between the disc and the
In accordance with a sixth feature of the unit according
spindle is provided, both in the inoperative position of
to the invention the cam disc is designed with an oblique
the stem and while it is beingvdisplaced.
surface in such manner that the guide pin, when the
In accordance with another feature of the gas shut-off
handle is turned beyond the aforesaid angular range;
unit according to the invention the ‘displacement of the C; Li3 passes the disc of the outlet valve towards a minimum ?ow
to the pilot burner without simultaneously opening for
the main burner of the installation.
3,070,155
3
4.
plate.
casing 1 of the unit and having a working surface facing
the direction towards the inlet valve, the said working
As a result, the said minimum opening may be adjusted
by varying the angle between the projection on the stop
from the stem when the stem 9 is turned away from its in
opening determined by means of the projection on the stop
plate and the guide pin.
In the unit according to the invention the pilot burner
valve is designed as a sleeve valve the slide of which is
mounted in a cylindrical bore in the casing of the unit
with its axis parallel to that of the inlet and outlet valves.
The result obtained is ?rstly a suitable compact form of
the combined unit and secondly that the operation of the
pilot burner valve and the outlet valve becomes very easy
surface cooperating with a guide pin 15 projecting radially
operative position. Between the disc of the outlet valve
and the casing is provided a closing spring 16 which forces
the disc against its valve seat 17, and between a collar 18,
which is in permanent connection with the stem 9, and
the casing 1 is provided an opening spring 19 which is
10 more powerful than the closing spring 16 and forces the
guide pin 15 of the stem against the working surface
of the cam disc 14 when the stem 9 is turned away from
its inoperative position. The turning angle of the stem
and clear; in particular, if the direction of displacement of
9 is limited partly by means of a projection 20 formed on
the said valves from their open to their closed position is
alike, for example, so that the operating handles of the 15 the handle it} of the stem and partly by means of a stop
plate 21 mounted on the stem 9, the said stop plate being
two valves, when both burners are alight, are in their top
position.
provided with another projection 22, both of the said
projections 29 and 22 cooperating with a stop 23 mounted
In the unit according to the invention the slide is pro
on the casing and of such design that it does not prevent
vided with sealing rings on either side of its closing sur
face.
20 displacement of the handle 10 in the axial direction of the
stem 9. The projection 20 of the handle 10 is so dis
As a result, double security against leakage of gas
posed in relation to the guide pin 15 of the stem 9 that
into the atmosphere is obtained in both positions of the
the guide pin 15 is lying in a ?rst notch 24- of the cam
safety pilot valve, since the gas, when both the inlet valve
disc .14 when the said projection is resting in contact with
and the pilot burner valve are closed, has to pass a sealing
surface in the inlet valve and a sealing surface in the pilot 25 the one side of the stop 23, and the notch 24 is of such
burner valve before reaching the atmosphere, whereas the
depth that a shoulder 25 mounted on the stem is clear
gas, when both the inlet valve and the pilot burner valve
of the disc of the outlet valve 3. The cam disc 14 has
are open, has to pass the two sealing rings in the last
another notch 26 which is so disposed in relation to the
mentioned valve before escaping into the atmosphere.
inoperative position of the stem 9 that at a predetermined
The invention will now be further described ‘with refer
ence to the drawing, in which
FIGURE 1 shows a gas shut-off unit in accordance
with the invention, viewed in a section on the line I--I
30 angular movement a of the stem 9 the guide pin 15 owing
to the pressure exerted by the opening spring 19 is passed
into the other notch 26 of the cam disc. The said notch
26 is of such depth that the shoulder 25 on the stem 9
passes the disc of the outlet valve 3 to a position giving
FIGURE 2 is the same, viewed in a section on the line 35 full opening of the outlet valve 3. The cam disc 14 is
furthermore so designed with an oblique surface 27 that
II—II of FIGURE 3,
‘byicontinued turning of the handle 10 beyond the afore
FIGURE 3 is a top view of the same,
FIGURE 4 is a ‘valve plate for same on an enlarged
said ?rst angular range a the guide pin 15 passes the
disc of the outlet valve 3 towards a minimum opening
scale,
which is determined by means of the projection 22 on the
FIGURES 5-6 and 11-12 show the handle of the unit
in positions corresponding to the characteristic positions
stop plate 21; the flow area of the said opening may be
regulated by varying the angle ,8 between the two projec
of the inlet and outlet valves of the unit,
tions 20 and 22. FIGURES 5-6 and 11-12 show the
FIGURES 7-8 and 13-14 are characteristic positions
of the cam disc of the unit and of a guide pin controlling
position of the handle 10 and FIGURES 7-8 and 13-14
the location of the guide pin 15 in relation to the various
the position of the outlet valve,
FIGURES 9-10 and 15-16 show corresponding posi
parts of the ‘working surface of the cam disc 14, the cam
disc in FIGURES 7-8 and 13-14 being shown in its de
tions of the inlet and outlet valves.
The drawing shows a gas shut-off unit consisting of
veloped state whereas it is, in fact, circular cylindrical.
a casing 1 with an inlet valve 2 having a valve disc coop
FIGURES 9-10 and 15-16 show such positions of the out~
erating with a ?rst valve seat and an outlet valve 3 coop
let valve disc in relation to the valve seat 17 and the
inlet valve disc in relation to its valve seat 28 as corre
erating with a second valve seat, and a pilot burner valve
spond to the positions of the guide pin 15 in FIGURES
4. The inlet valve 2 is adapted to be retained in its open
position against the pressure exerted by a spring 5 by an
7-8 and 13-14.
electromagnet 6 which in known manner is fed with cur
The pilot burner valve 4 is designed as a sleeve valve
the slide 29 of which is placed in a cylindrical bore 30
rent from a thermo element (not shown) which is in heat
provided in the casing 1 and having its axis parallel with
transmitting connection with a pilot burner (not shown)
that is connected to a discharge pipe 7. The supply of
that of the inlet and the outlet valve. The valve body is
electric current to the electromagnet 6 from the thermo
provided with a push button 31 serving to effect manual
element takes place through a wire 8. The outlet valve
displacement of the slide which in its bottom position
3 consists of a spring-loaded disc valve mounted coaxially
closes the discharge opening 12 from the room 11 and in
with the inlet valve 2 and supported by an axially dis
its top position puts the said discharge opening into
placeable stem 9 which can be operated manually to dis
communication with the discharge pipe 7 for the pilot
place the inlet valve 2 by pressing down a handle 10
burner (not shown). The discharge opening 12 is de
signed as a passage 32 extending transversely of the bore
mounted on the stem 9. The outlet valve 3 closes in the
inoperative position of the gas shut-off unit a space or
311 and is closed at its outer end by means of an inserted
chamber 11 which is furthermore limited by the disc
ball 33. The slide 29 is provided with sealing rings 34
of the inlet valve 2, which engages with a valve seat 2',
on both sides of its closing surface 35.
and has a discharge opening 12 leading to the pilot burner
The operation of the gas shut-off unit is as follows:
valve 4 which is built together with the shut-off unit. The
In the closed position of the unit, which is shown in
‘FIGURES 1, 2, 3, 5 and 9, both the inlet valve 2 and the
disc member of ‘the outlet valve is provided with a sealing
plate 13 of resilient material such as rubber or plastic, 70 outlet valve 3 are closed, and the pilot burner valve 4 is
in its lowermost position as indicated in FIGURE 2 where
the said sealing plate being bent around such edge portions
the closing surface 35 closes the passage 32. The safety
of the disc as face the stern and resting in close contact
system of the pilot burner consists therein that even
with the stem 9 as shown in FIGURE 4. The displace
though a user through a mistake would begin by open
meat of the stem 9 in the direction away from the disc of
the inlet valve 2 is limited by a cam disc 14 fixed in the 75 ing for the feed to the main burner by turning the handle
of FIGURE 3,
raj
5
3,670,155
10 from the inoperative position shown in FIGURE 5, in
which the projection 20 is resting in contact with the
handle is lying opposite the stop 23, this manipulation
of about 20-25 seconds the electromagnet 6 will release
its armature 39 so that the inlet valve 2 is closed.
What I claim and desire to secure by Letters Patent is:
1. A thermoelectricallycontrolled gas shut-off unit for
use with gas consuming-apparatus having a main burner
and a pilot burner having a thermo element in heat-trans
will not open to the gas flow, since a gas supply to main
mitting relationship therewith, said unit having a casing,
stop 23 and where an “O” engraved on the handle indi
cates the neutral position of the handle, to the position
shown‘in FIGURE 11 where a ?ame engraved on the
burner and pilot burner is impossible because the inlet
an inlet valve in said casing, said inlet valve including a
valve stem carrying valve disc, means de?ning in said
valve 2 is closed and the pilot burner valve is closed too.
The user is hereby reminded of the fact that the pilot 10 casing a first valve seat and a second valve seat, said means
burner valve is to be opened by moving the push button
de?ning a chamber between said valve seats, a spring
normally maintaining said inlet valve in closed position
31 upwards, but even this is not su?icient to cause admis
sion of gas to the pilot burner. The user is hereby re
with said valve disc against said ?rst valve seat, an
minded of the fact that the handle 1d has to be pressed
electromagnet adapted when energized to retain said valve
downwards for a brief interval as indicated by a ?nger 36 15 in open position against the action of said spring and re
ceiving current from the thermo element in heat trans
in FIGURE 6 and to be kept down until the pilot burner
mitting relationship with said pilot burner, and a manually
is lighted, for example by means of a gas lighter or a
operable outlet valve in said casing to control the ?ow of
match. By the downward movement of the handle the
gas to said main burner, said manually operable outlet
stem acts on the stem of the inlet valve, causing the inlet
valve to open as indicated in FIGURE 10, whereby the 20 valve comprising a rotatable axially-displaceable stem
carying a guide pin, said last-named stern being aligned
pilot burner is fed with gas from the inlet opening 38 of
with said ?rst-named stem for contact therewith upon
the unit‘ through the room 11 and the passage 32 and the
downward movement of said last-named stem, a cam
open pilot burner valve 4. When the pilot burner 4 is
member in said casing positioned to be engaged by said
alight, the thermo element (not shown) is heated. The
said thermo element is in heat transmitting connection 25 pin, a valve disc member surrounding said second-named
stern, a closing spring normally urging said disc member
with the pilot burner and through the wire 8 the thermo
against said second valve seat, whereby said outlet vavle
element supplies in the course of 15—20 seconds such a
is closed in the off position of said unit, an opening spring
powerful current to the electromagnet 6 that the latter is
normally urging said guide pin against said cam member
capable of retaining an armature 39 mounted on the stem
37 of the inlet valve 2 against the pressure exerted by the 30 and normally urging said last~named stem away from said
second valve seat and away from said ?rst-named stem,
spring 5, after which the pilot burner is fed with gas, even
said last-named stem having a shoulder positioned to
though the handle 10 is released and passed upwards by
engage said valve disc member to open said outlet valve
the opening spring 19 so that the guide pin 15, which in
upon movement of said last-named stem away from said
FlGURE 8 is indicated in its bottom position, returns to
its inoperative position in the notch 24 as indicated in 35 second valve seat and controlling the distance between
said member and said seat, said chamber between said
riUURE 7. Meanwhile, if the pilot burner fails to light
?rst valve seat and said second valve seat having a dis?
and the thermo element does not become heated, the arm
charge passage, and a pilot burner valve in said casing
ature 39 is not retained by the electromagnet 6, and the
communicating with said passage and thereby with said
inlet valve 2 is again closed by the spring 5. When the
chamber and controlling ?ow from said passage to said
pilot burner is alight, the user may by turning the handle
pilot burner.
10 from the position indicated in FIGURES 5 and 6 to the
2. A gas shut-off unit as de?ned in claim 1, wherein the
position indicated in FIGURE 11 open fully to the main
valve disc member of the outlet valve is provided with a
burner, the guide pin 15 being passed into the notch 26
sealing plate of resilient material which is bent around
by the spring 19 and the outlet valve being consequently
the edge portion of the valve disc which faces the stem
displaced to a maximum extent from its seat 17. The
main burner, which is connected to the discharge opening 45 and rests in close contact with the stem.
3. A unit as de?ned in claim 1, wherein said cam disc
40 of the unit, is thereby lighted automatically from the
has a working surface facing the ?rst valve seat and said
pilot burner. The gas supply of the main burner may
guide pin projects radially from the stem, said opening
be varied from fully open as indicated in FIGURE 15
to an adjustable minimum opening as indicated in FIG
spring being more powerful than the closing spring and
said shoulder cooperating with the valve disc member so
as to displace said valve disc member when the last
named stem is turned away from its inoperative position.
surface 27. This possibility of regulation is indicated on
4. A unit as de?ned in claim 3, further comprising a
the upper side of the handle by a small engraved ?ame
handle for said last-named stern having a projection, and
and an engraved scale. The minimum opening of the
main burner is determined thereby that the projection 22 55 a stop plate is mounted on the last-named stern and pro
vided with a second projection, a stop carried by said
provided on the stop plate 21 cannot be caused to pass
casing cooperating with said projections to limit the angu
by the stop 23. The main burner can be extinguished
lar movement of said last-named stem.
thereby that the handle is passed from the positions indi
5. A unit as de?ned in claim 4, wherein said cam disc
cated in FIGURES l1 and 12 to its inoperative position,
which is shown in FIGURE 5, in which the guide pin 15 60 has a ?rst notch and wherein the projection on the handle
is disposed in such manner in relation to the guide pin of
absorbs the tension exerted on the stem 9 by the opening
the stem that the said guide pin lies in said ?rst notch in
spring 15 by resting in the notch 24, whereby the closing
the cam disc when said projection is resting in contact
spring 16 causes the outlet valve to close, while the pilot
with one side of the stop, the notch being of such depth
burner remains alight, the electromagnet 6 retaining its
that the shoulder of the stem is clear of the disc valve
armature 39, so that the gas supply to the pilot burner
member of the outlet valve.
is still open. The pilot burner is extinguished by
6. A unit as de?ned in claim 5, wherein the cam disc is
the push button 31 being pressed down to its bottom posi
formed with a second notch disc which is so disposed in
tion, in which the closing surface 35 closes the passage
relation to the inoperative position of the stem that the
32, and when the pilot burner is extinguished, the current 70 guide pin upon a predetermined ?rst angular movement
through the electromagnet is cut oif, after which the spring
of the last-named stem is forced by the pressure exerted
5 closes the inlet valve 2. Should the pilot burner be
by the opening spring into said second notch which is of
extinguished for one reason or other, for example, owing
such depth that the shoulder provided on the stem moves
to a heavy drop of the gas pressure, the thermo element
the disc of the outlet valve to full opening of the outlet
will likewise cease to give current, and after an interval 75 valve.
URES l2, l4 and 16, the guide pin 15 being, by the turn
ing of the handle 10, caused to slide against the oblique
8,070,155
7. A unit as de?ned in claim 6, wherein the cam disc
is “formed with an oblique surface in such manner that
the guide pin, when the handle is turned beyond said ?rst
angular movement,'moves the disc of the outlet valve
towards a minimum ?ow opening determined by the pro
jection on the stop plate.
8. A unit as de?ned in claim 1, wherein the pilot burner
valve comprises a valve slide and a cylindrical bore
formed in said casing with its axis parallel to thatof the
?rst and second valve seats, said valve slide being movable 10
in said bore.
9. A unit as de?ned in claim 8, wherein the Slide is
provided with sealing rings on both sides of its closing
surface.
5%
References Cited in the ?le of this patent
UNITED STATES PATENTS
2,455,521
2,596,796
2,705,532
2,715,437
2,911,152
Rice et a1. my _________ __ Dec. 7, 1948
Solovieff ____________ __ May 13, 1952
Thornbery ____________ __ Apr. 5, 1955
Drow ________________ __ Aug. 16, 1955
Weber et a1. __________ __ Nov. 3, 1959
FOREIGN PATENTS
755,088
Great Britain ________ __ Aug. 15, 1956
5_._
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