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Патент USA US2122930

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July 5, 1938.
- 2,122,930
Filed June 29,, 1935
2 Sheets-Sheet 1
75 ‘
141.00 CUE/ON!
July 5, 1938.
Filed June 29, 1955
2 sheets-sheet 2
A1. 00 Cue/0N1
Patented July 5, 1938
Aldo Curioni, Katonah, N. Y., assignor to The
Gasolaire Corporation,
poration of New York New York, N. Y., a cor
Application June 29, 1935, Serial No. 29,126
1 Claim.
This invention relates to devices for controlling
electric circuits and more particularly refers to
improvements in control devices for liquid fuel
burners of the type in which electric means are
5 used for igniting the fuel when the operation of
the burner is started.
As an example of one type of burner in con
_nection with which the improvements forming
the subject of the present invention may be used,
reference may be had to an oil burner, such as
described and claimed in my copending applica
tion, entitled “Oil gasi?er and burner”, Serial
No. 715,335, in which a mixture of air and atom
ized fuel is directed under pressure against a hot
15 impact plate in a vaporizing chamber so as to
issue therefrom in the form of a combustible gas.
In said burner the impact plate is initially
heated by means of an electric resistance ele
ment, which is rendered incandescent by the pas
sage of an electric current and which is arranged
so as to function both as a preheater of the im
pact plate and as an igniter of the air-fuel mix
ture. An electric motor is used for driving a
splash wheel, which directs a spray of atomized
25 fuel against the impact plate, and an air pump,
which supplies air under pressure to the vapor
izing chamber.
In the operation of a burner of the type speci
?ed, or in fact of a burner of the general type
30 used for house heating purposes, it is desirable
to delay the admission of fuel to the vaporizing
chamber until the igniting element is ready to
function, and if used also as a preheating ele
ment for the impact member, until the impact
“ member has been heated to a temperature suffi
been produced by the gradual operation of a tilt
able mercury switch.
All of these controlling devices more or less
entail complications in the control circuit and
generally result in rather expensive installations,
comprising a number of different elements, fre
quently apt to get out of order or to require con
stant attention.
The primary object of the present invention
is to provide a novel and improved arrangement 10
for controlling the operation of the electric ele
ments of a liquid fuel burner, whereby the various
circuits are controlled in the proper sequence
by means of an entirely mechanical character.
Another object of the invention is to provide a 15
novel and. improved type of multiple circuit con
trolling switch whereby a plurality of circuits can
ation of the various circuits in a predetermined 25
Other objects and advantages of the present
invention will more fully appear as the descrip
tion proceeds and will be set forth and. claimed
in the appended claim.
My invention is illustrated by way of example
in the accompanying drawings, in which:
Fig. l is a vertical section of a multiple circuit
controlling switch, adapted for use in connection
with a liquid fuel burner of the character above 35
cient to vaporize the fuel. It is also desirable to
through line 2-2 of Fig. 1;
ments mentioned has usually been obtained
through the utilization of the thermic or magnetic
eifects of an electric current. Thus, switches
controlling the various circuits have been caused
to operate by the energization or deenergization
of solenoids, by relays controlled by thermostatic
50- devices, or by some mechanical action due to the
expansion of a metallic member or coil under
the in?uence of heat. In some cases, delay pro
ducing devices, such as a dashpot, for instance,
have been used in order to delay the closing or
opening of a circuit; in other cases a delay has
through the operation of a single actuating
A further object is to provide a multiple circuit
time delay switch of a simple and sturdy con
struction, comprising a minimum number of
parts and adapted for positive and reliable oper
deenergize the igniting element after the ignition
of the fuel has taken place, without, however,
discontinuing the operation of the motor actuat
ing the fuel and air supplying means.
In control systems heretofore known the re
quired sequence of operation of the various ele
(Cl. 200-35)
Fig. 2 is a plan sectional view of the same
Fig. 3 is a detail plan sectional View through
line 3-—3 of Fig. l; and
Fig. 4 is a diagrammatic representation of an
oil burner and an electric circuit, comprising the
electrically operated elements of said burner and
the multiple control switch shown in Figs. 1 to 3.
Referring to the diagram of Fig. 4, l0 desig- 45
nates the body of a burner of the type described
and claimed in my copending application above
referred to, said body forming a quasi circular
chamber H at the bottom of which a supply of
liquid fuel, I2, is maintained at a constant pre- 50
determined level, and an extension from said
chamber in the form of a tubular arm l3, termi
nating in a vaporizing chamber (not shown)
within which is located a tubular impact mem
ber I4.
Said impact member is initially brought to a
high temperature, sufficient for vaporizing the
fuel, by an electric resistance element l5, housed
therein. An electric motor |6 actuates a splash
wheel l1, housed within chamber H and having
its lower edge portion immersed within the liquid
fuel |2. By virtue of this arrangement, the
splash wheel during its rotation picks up fuel
from the bottom of chamber | | and projects it in
.10 atomized form within tubular extension |3
against the impact member 14.
35, switch 3|, wire 29, resistance element l5 and
back through wire 24 to main wire 2|. This will
cause the energization of resistance element |5
which will become incandescent and will raise
the temperature of impact member M to the fuel
vaporizationpoint. Thislasthavingbeenreached,
switch 28 should now be closed by insertion of
knife blade 38 between contact members 21, 32.
This will complete the circuit of the motor
through wires 22, 26, so that liquid fuel will now
be projected against the hot impact member l4.
By means of a special arrangement (not
shown) when the atomized fuel, mixed with air,
strikes the hot surface of impact member M
and becomes vaporized, part of the resulting
gaseous fuel is caused to come in contact with
the surface of the incandescent electric element
l5, which after having functioned as a preheater
for the impact member, will now act as an igniter
for the fuel.
As stated before, in the operation of this type
of burner it is desirable ?rst to energize the
resistance element l5 so as to bring the impact
member M to a fuel vaporizing temperature and
then to start the motor, in order to supply fuel
and air to the vaporizing chamber. The air
After a short period ignition of the fuel will have
occurred and resistance element l5 should be
deenergized by withdrawal of knife blade 39
from its closed position shown. This will inter 15
rupt the circuit of the resistance element but
will not affect the circuit of the motor, which
will remain closed through switches 20, 28.
fuel mixture having become ignited by contact
with the electric resistance element, the latter
being no longer needed, should then be deener
gized while the electric motor continues to op
In order to automatically control the energiza
tion and deenergization of the various circuits
involved in the proper sequence, without re
sorting to the use of devices depending for their
operation upon magnetic or thermic effects of
the electric current employed, I have devised an
entirely new type of switch whereby all the cir~
ouit connections are controlled by purely me
chanical action, the various switches being op
erated by a single control mechanism.
In the diagram of Fig. 4, H3 designates one of
the main wires from an electric source of supply,
leading to one of the contact members I9 of a
knife switch 20, 2| designates the other main
wire, a branch of which, 22, leads to one of the
poles 23 of the electric motor l6 and another
branch 24 leads to resistance element l5. The
other pole 25 of the electric motor is connected
by a wire 26 to a contact member 21 of a knife
switch 28, and the return wire 29 from the re
sistance element I5 is connected to a contact
member 30 of a knife switch 3|. The other con
tact member 32 of switch 28 is connected to the
other contact member 33 of switch 20 by a bar
34 and a wire 35 connects said bar 34 to the
other contact member 36 of switch 3|. Connec
tion between the contact members of switch 20
can be established by insertion therebetween
of knife blade 31 and in a similar manner con—
nection between the contact members of switch
28 can be established by insertion therebetween
of‘ knife blade 38 and connection between the
contact members of switch 3| can be effected by
insertion therebetween of knife blade 39.
When the burner is inoperative the various
switch elements are in the position shown, in
which knife blade 39 closes the circuit of switch
3| while switches 20, 28, are open. No current
70 can ?ow through the circuit because the main
circuit is interrupted at the switch 20. In order
to start the burner the circuit should ?rst be
closed at 20 by inserting knife blade 31 be
tween contact members IS, 33; the current will
then ?ow through wire l8, switch 20, bar 34, wire
In Figs. 1 to 3 I illustrate a switch mechanism
adapted to control the circuits just described by 20
entirely mechanical means.
The switch assembly, which is enclosed in a
casing 40, includes the switch elements shown in
Fig. 4, which are also shown in a larger scale
in Fig. 3, and means for actuating the same in 25
the proper sequence.
The switch contact members are carried by an
insulating block 4| and the switch blades are
preferably mounted so as to operate with a quick
make and break action. For instance, knife
blade 31 is pivotally mounted at 42 on a bracket
43 inwardly extending from end wall 44 of the
casing. On the same pivot is mounted a dog 45,
having two angularly spaced finger extensions
45, 41, and a downwardly inclined extension 48,
connected by a snap-over spring 49 to the switch
blade 31.
In the position shown, ?nger extension 46 is
directly in the path of a pin 59, carried by an
arm 5|, mounted on a shaft 52. If said shaft is
caused to rotate in a counterclockwise direction,
as indicated by the arrow in Fig. 1, pin 50 will
after a while press against ?nger extension 46,
swinging dog 45 in a clockwise direction about
its pivotal support. This will eventually cause 45
the point of attachment 53 of the snap-over
spring 49 to reach and pass beyond the dead
point, when said snap-over spring, the tension of
which has been in the meantime increased, will
be able to suddenly contract, acquiring the posi
tion shown in dot and dash lines at 49’, and
forcing the switch blade to the position shown in
dot and dash lines at 31’.
This will also cause the dog 45 to acquire the
position shown in dot and dash lines at 45', in
which its finger extension 41 will have come to
occupy the position shown at 41’, which is di
rectly in the path of the return movement of arm
5|, which will ultimately have acquired the po
sition shown in dot and dash lines at 5|’.
Switch blades 33, 39, are pivotally mounted to
operate in substantially the same manner on
brackets 54, 55, respectively, which are horizon
tally spaced a certain distance from bracket 43.
Pivots 56, 51, of switch blades 38, 39, are prefer 65
ably coaxial with pivot 42 of switch blade 31, as
shown, although the three switch blade struc
tures are entirely independent of one another.
In order to operate the three switches in the
proper sequence, it is, therefore, sufficient to pro
vide shaft 52 with two additional switch actuat
ing arms, 58, 59, extending therefrom, said arms
being provided with actuating pins 60, 6|, re
spectively, and being angularly spaced with re
spect to each other and arm 5|, so as to deter
mine the proper time delay between the opera
tion of the three switches.
It is to be understood that the movement of
rotation of shaft 52 should be relatively slow
switch controlling the igniter
normally closed, it is, of cour
scope of my invention to use two
in order to allow a su?icient time to elapse be
tween the operation of the ?rst switch, causing
the energization of the electric resistance ele
ment, and that of the second switch controlling
the motor circuit; the movement of rotation of
10 said shaft should, therefore, be controlled by a
suitable time delay mechanism, for instance, an
escapement mechanism of the conventional type
In the same shaft 52 is urged to rotate in a
15 counterclockwise direction by a tension spring
62, attached to a band 63 wound upon a drum
S4, ?xed on said shaft. Said shaft also carries
an actuating arm 65, which projects frontwardly
of the casing through a segmental slot 66. Said
20 arm 65 is equipped with a pawl 61, engaging
a ratchet wheel 68, formed integral with or at
tached to a gear wheel 69, forming part of the
escapement mechanism. Said gear Wheel is in its
turn in mesh with a pinion ‘in, integral with gear
25 wheel 1|, meshing with a pinion ‘l2, integral with
a sprocket wheel 13. The rotation of the sprock
et wheel 13 is controlled by the escapement
mechanism proper, said escapement mechanism
comprising a balance wheel 14, mounted on a
30 shaft 15, to which is secured one end of a hair
spring ‘it, the other end of which is secured to
some stationary point, as at 11. A pin 18 ex
tends from the balance wheel 14 to engage the
teeth of the sprocket wheel 13, completing the
escapement mechanism which functions in a
well known manner.
It is to be understood that the particular type
of time delay device used, in order to slow up
the rotation of shaft 52, has no bearing on the
present invention since it is obvious that a num
ber of different arrangements may be used for
the same purpose.
The switch mechanism is
normally set in its inoperative position by look
ing its actuating arm 65 against rotation. For
45 instance, said arm may be provided with a pin
‘59 adapted to be engaged by a latch 80, urged
into its engaging position by a spring BI, and
adapted to be released by pressing against a
?nger 82.
It is obvious that, the switch mechanism be
ing in its inoperative position shown in the
drawings, by forcing ?nger 82 upwardly latch
80 will release arm 65 and shaft 52 will begin
to rotate, due to the pull exerted by spring 62.
55 Its movement of rotation will take place slowly,
due to the delaying action of the clock mecha
nism, and the three switches controlling the op
eration of the burner in the manner described
will be operated in the proper sequence.
On the other hand, due to the unidirectional
character of the connection between arm 65 and
ratchet wheel 68, shaft 52, together with arms
5|, 58, 59, carried thereby, can be quickly‘re
stored to its normal position, shown in the draw
ings, by means of its actuating arm 65; latch 68
automatically reengaging pin 19 as soon as the
return movement of said shaft and arms has
been completed.
It will also be observed that during their return
j movement arms 59, 58, 5| will restore the switches
to their original status, pins 6|, 60, 50, striking
?ngers 41 of the dogs 45 forming part of the
switches, in the order named.
Although I have shown and described the
of the movement of the actuating means.
other words, the switch arrangement should
be such that the operation of the actuating
member will ?rst cause the energization of the
igniter circuit, then the energization of the mo
tor circuit, and then the deenergization of the
igniter circuit.
Although I prefer to use individual actuating
arms for the various switches because of the
possibility of setting said arms at different angu~
lar positions, it is within the scope of my inven
tion to use a single actuating member mounted
on shaft 52; said actuating member having suit 20
ably spaced means for actuating the various
switches in the proper sequence after the re
quired time intervals. It is also within the scope
of the invention to reverse the relative positions
of the switches and actuating means by placing 25
the switch operating members at different points
along the path of travel of a single actuating
From the foregoing it will be seen that I pro
vide a thoroughly reliable system of control of a 30
plurality of circuits such as are employed, for
instance, in connection with an oil burner; my
invention also including a new type of multiple
switch control mechanism whereby a single op—
erating member is caused to control a plurality 35
of circuits in a predetermined manner by purely
mechanical means.
It is obvious that the constructional details of
my invention-may vary from those shown with
out departing from the inventive idea. The
drawings will, therefore, be understood as being
intended for illustrative purposes only and not
in a limiting sense.
I accordingly reserve the right to carry my in
vention into practice in all those ways and man
ners which may enter, fairly, into- the scope of
the appended claim.
I claim:
A device of the class described comprising a
normally open two pole main switch, a normally
open two pole secondary switch having one of its 50
terminals electrically connected to one of the
terminals of said main switch, a normally closed
auxiliary switch having one of its terminals also
connected to said two connected terminals, said 55
switches being arranged in spaced planes, a
shaft disposed transversely of said planes, a
spring urging said shaft to rotate in a given di
rection, releasable means restraining said shaft
against rotation, time delay means regulating 60
the speed of rotation of said shaft when released,
a plurality of switch actuating arms carried by
and spaced along said shaft, said arms being an
gularly disposed with respect to one another and
to said switches, so as to ?rst close said main
switch, then close said secondary switch, and 65
then open said auxiliary switch after a prede
termined time interval said arms restoring said
switches to their original status when said shaft
is returned to its original position, and a man
ually operable arm mounted directly on said 70
shaft, for restoring said shaft to its original po
sition, independently of said time delay means.
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