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Патент USA US2411737

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‘ Nov. 26, 1946.
2,411,737 -
H. O. KLINKE
METHOD AND APPARATUS FOR CONTROLLING TORCH SPACING
Filed Feb. 7, 1946
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Nov. 26, 1946. "
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H. o. KLINKE ‘
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‘ 2,411,737‘
METHOD AND APPARATUS -FQR CQNTROLLING TORCH SPACING
Filed Feb. 7, 1946
2 Sheets-Sheet 2
INVENTVOR
MENY a. ?ll/VH5
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ATTORNEYS
Patented Nov. 2c, 1940 '
5 2,411,737
‘UNITED “STATES ‘PATENT OFFICE
2,411,731
‘METHOD AND APPARATUS FOR CON‘
TROLLING TORCH, SPACING
Henry 0. Klinkc, Forest inns, N. Y., assignor to
Air Reduction Company, Incorporated, a corporation of New York
'
‘
-
Application February '1, 1946, Serial No. 646,079 . .
8 Claims. (crass-2a)
1
2
This invention relates to a method and appa
ratus for controlling the spacing between the tip
jet of the torch; and
of a gas torch and the surface of a work-piece
'
Fig. 4 is a view similartoFig. 3 showing a mod
i?ed form of torch control mechanism in which
the up and down movement of the torch by the
that is being cut, welded, or otherwise treated by
the torch.
' '
work surface and by its interruption by the ?ame
‘
In mechanical cutting, welding, or heat-treate
motor depends’ upon the completion and break
ing apparatus it is desirable to- maintain the tip
ing of electric'circuits-through two liquid jets
of the gas torch a uniform distance from the '
instead of one.
_
» ,
,
work surface, and it is the principal object of
Referring ?rst to Figs. 1 and 2, the lower end
this invention to provide a method and appa 10 of the tip of a gas torch is represented at I. In
ratus by which this is automatically accom
these ?gures the tip is shown as a heating or,
welding tip of the block type having the usual
In the preferred form of the apparatus a liquid
jet passages 2 for the gas mixture which feeds
jet-producing device attached to ‘the torch or
the preheating ?ame jets 3. Attached to the
1 its tip delivers a ?ne jet of a conductive liquid, 15 torch or torch tip there is a liquid jeteproducing'
plished.
‘
-
-
such as salt water, angularly toward the work -
device .such as a copper bar or tube 4 having a
surface and toward the flame jet of the torch
so that the liquid jet strikes the, work surface
short .of ‘the ?ame jet when the spacing of the
torch tip from the surface is relatively small but 20
is intercepted bythe ?ame jet and interrupted
by vaporization of the portion of the jet in con
tact with the ?ame if the spacing is relatively
great. The liquid jet is connected in an electric
circuit which includes the work-piece, and the
completion of the electric circuit by contact of
the liquid jet with the work surface and the
breaking ofvthe electric'circuit by interruption
liquid passage 5 therein with a discharge portion
6 adapted to project a ?ne jet of .liquid ‘I angu
larly toward the surface of the work-piece W and
toward the ends of the ?ame jets. The liquid
may be any suitable liquid that will conduct elec
tricity and that is capable of being vaporized
when the liquid jet. comes in contact with the
?ame jet, such as salt water or water containing
25 an acid. Preferably, salt water is used for the
> purpose as this can be readily and economically _ >
produced by passing tap .water through arecep
tacle containing salt. ' A pair of electric conduc
of the liquid jet are utilized to control an electric
‘ tors 8 and 9 are connected, respectively, to the
motor which moves the torch up or down to sub 30 liquid jet-producing device‘ 5 and the work-piece
_ stantially preserve-the desired Spacing between
the torch tip and the work surface.
.
It will be seen from Fig. 1 that when the torch
Several formsof. apparatus embodying the in
vention and that are adapted for use in carry
' ing out the method are illustrated more or less
diagrammatically in the accdmpanyingdraw
ings, in which
‘
Figure 1 is aside elevation of‘the lower end of '
' tip is close enough to the work surface for the
liquid jet 1 to strike the surface an electric cir
cuit may be completed through the liquid jet, the
jet serving as a conductor to conduct the current
between the work-piece and the jet-producing
device. When the spacing between the torch tip
and the work-piece is greater than shown inFig.
with liquid jet-producing means, this view show? 40 ,1, theiliquid jet 1 is intercepted by one of the pre
ing how the jet of conductive liquid strikes the
heating ?ame jets and the ?ame-contacting por
the tip of .a heating or welding torch-provided
‘ . work surface when the spacing ‘of the torch tip
' from it isrelatively small and'how the electric
circuit which includes the liquid 'jet is completed
under these circumstances;
,
V
'
Fig. 2 is a view similar towFigure 1 showing how
the ?ame-contacting portion 'of‘the liquid jet is
vaporized and'the jet interrupted when the spac
ing of the torch tip from the work surface isrel
tion of the jet is vaporized and the jet thus inter- ‘
rupted as shown in Fig. 2. Under these circum
stances the electric circuit, of which the liquid
jet forms a part, is broken.
‘
I , .l The completion and breaking or the electric
circuit through the liquid jet, as above described,
is utilized to control movement of the torch to
substantially preserve the desired normal spacing
‘ativ'eLv great and how the electric circuit is broken . 50 of, the torch tip from the .work surface; -One
\
form of control mechanism for this purpose is
‘under these circumstances;
‘ Fig. 3 is a diagrammatic,representationof on
form of‘control- mechanism for- moving-the torch ‘
up and down as the electric‘ circuit is completed
and broken by contact of the liquid Jet with the
diagrammatically illustrated in Fig. 3. In this,
'?g'urethe torch I0 is shownas a welding torch
adapted to produce a heating'?ame jet II. The
torch carries a, liquid jeti-producing device 4' of
2,411,737
3
,
7
of torch shown, such as a copper tube.
4
.'
.
motor in the opposite direction to move the torch
up. Thus, as long as the normal desired spacing
occurs between the torch tip and the work sur
any kind that is suitable for use with the type
The
torch and the liquid jet-producing device are’
face, i. e. when the liquid jet ‘I touches the work
movable up and down by a reversible electric
surface, there will be no movement of the torch,
motor I2 through the gearing represented at I3.
The previously described conductors 8 and 9 con
but if the spacing becomes less than the normal
desired spacing the motor will operate to move
the torch up, and should the spacing become
device and the work-piece, are supplied with
greater than the normal desired spacing the
current from a power line I4-l5. The circuit,
of which the conductors 8 and Storm a part, 10 motor will operate to move the torch down.
In both systems above described the control
includes the winding I6 of a relay ,I‘I. .When the
mechanism may be utilized to initially create the
relay is energized the contact-s l8 and I9 close to
normal desired spacing between the torch tip and
complete a circuit to the electric motor from line
thework surface, 1. e. it may be utilized to' bring
conductor I4 through the conductors 20, 2| and
22 to line conductor 15. This causes rotation of 15 the torch to its proper position relative to the
nected, respectively, to the liquid jet-producing
the motor in one direction.
When the relay is r
not energized a spring 23,moves the contact l8
into engagement-with a contact 24 to complete
a circuit to the motor from line conductor I4
_ through the conductors 20, 25 and 22 to line con
the desired normal spacing between the work sur
face and the torch tip will be maintained regard
20 less of any unevenness in the work surface or
ductor I5. This causes the motor to rotate in
the opposite direction.
work surface, and thereafter, during relative
movement between the work-piece and the torch
'
It will now be seen that if the spacing between
other conditions which tend to destroy the de
sired normal spacing.
. ,
Instead of using a jet of conductive liquid as
the substance that controls the torch-moving
the work-piece and the torch tip becomes suffi
ciently small the liquid jet ‘I will strike the work 25 motor, a conductive wire may be fed angularly to
ward the work and toward the ?ame jet made of
surface and complete the circuit of the relay II.
material that is capable of being melted by the
This will cause the motor to rotate in a direction
The wire would touch the work surface
that will move the torch tip up. When the liquid
when the torch tip is relatively close to the sur
jet is intercepted by the ?ame jet and is vapor
ized the relay circuit is broken and the motor is 30 face and would be intercepted and interrupted
by the ?ame jet when the torch tip'is relatively
caused to rotate in the opposite direction to move
far from the work surface, in the same manner
the torch tip down. The tip will therefore alter
as above described in connection with the liquid
nate between a position in which the liquid jet
let. In either case the column of conductive
‘I is .just touching the work surface and a posi
tion in which it is not touching the surface. The 35 substance, when intercepted by the ?ame jet,
would be interrupted‘because of a change in the
relay will continually operate and the motor will
physical state of the substance caused by the heat
continually jog'the torch tip slightly up and down
and maintain an average normaldesired spacin
of the torch tip from the work surface.
’
of the ?ame.
'
'
While the controlling of the current in the
Fig. 4 diagrammatically illustrates a modified 40 circuit of each liquid jet is herein referred to as
completion and breaking of the circuit, it will be
form of control mechanism in which there are
understood that this is intended to include not
two jet-producing devices 4' and 4" which pro
only an absolute breaking and reestablishment
ject two liquid jets ‘I and ‘I’ instead of the single
of the circuit but also a virtual breaking of the
liquid jet previously described. The two jets are
circuit by reduction of the current in the circuit
so arranged that the jet ‘I’ strikes the ?ame jet
0f the torch slightly higher than the point at '
from some relay-energizing value to some very
which the liquid jet ‘I strikes it. In Fig. 4 the
small relay-armature releasing value by the in
28 is connected to the‘ liquid jet-producing device
4" and is connected through the winding 29 of
a second relay 30 to the line conductor |4.' It
will thus be seen that the second liquid jet 1' is
in- an electric circuit which includes the conduc
For instance, when the jet is in contact with the
troduction of the very high resistance in the path
torch is shown as a cutting torch having pre
Y from the jet-producing device to the work-piece
_ heating ?ame jets 3'. The previously described
conductors 8 and 9 which conduct current to the I when the liquid jet is vaporized, and restoration,
of the current to its normal relay-energizing
liquid jet 1 ‘are part of a circuit which includes
value when the liquid jet strikes the work surface.
the winding 26'of a relay 21. A third conductor
tors 9 and 28 and the relay 30.
.
work surfaces. relatively high conductivity path
of about 1 millimho might exist between the jet
producing device and the work, whereas when
the jet is vaporized the conductivity of such path
might be as low as 0.005 millimhos, the ratio of
The normal desired spacing between the torch‘
tip and the work surface occurs when the liquid 60
jet ‘I is touching the work surface and the liquid
jet ‘I’ is not touching. If the spacing becomes
too great and the jet 1 is not touching, the circuit
of the relay 2'I isvbroken, thus allowing the spring
3| to close the relay contacts 32 and 33 and com
conductance being thus about 200 to l and the -
3G to line conductor l5. This willrotate the
stance will be intercepted by the flame jet and
current being low enough when the jet is vapor
ized to cause the relay windings to releasetheir
armatures.
I claim:
.
'
1; The method of controlling the spacing of a
torch tip from the surface of a work-piece which
comprises feeding angula'rly toward the work sur
plete a circuit to the motor l2 from line con‘
face and toward the ?ame jet of the torch a small
ductor I4 through the conductors 34, 35 and 36
column of conductive substance capable of hav
to line conductor I5. The motor then rotates in
ing its physical state changed by contact with the
a direction to move the torch down. If the torch
tip is too close to the work surface and the liquid 70 ?ame jet so that when the spacing between the
work surface and the torch tip is relatively small
'-jet 1-’ is touching the surface, the winding of
said column of substance will strike the work
relay 30 is energizedto close the contacts 31 and
surface short of the ?ame jet and when such
_ 38 and complete a circuit to the motor from line
spacing is relatively great’ the column of sub
conductor I4 through conductors 34, 39, 40 and
I 2,411,737
‘
‘
5
the portion-Vin contact with the ?ame will have its
physicalstate changed to thereby interrupt the .
column, ‘passing electric current through said
column of substance, and utilizing the change in
value of said current produced upon interruption 5
of the column of substance and upon its striking
surface short of the ?ame jet and when such
spacing is relatively great the liquid jet will be
intercepted by the ?ame jet and be interrupted
by vaporization of the portion of the jet in con
tact with the ?ame, an electric circuit of which
the liquid jet and the work-piece constitute a
the work surface for moving the torch tip toward
and away from the work surface.
2. The method of controlling the spacing of a
part, and means in said circuit responsive to a i
change in current value in the circuit produced
upon interruption of the liquid jet and upon its
torch tip from the surface of a work-piece which 10 striking the work surface for controlling said
comprises feeding angularly toward the work sur
torch moving means. '_
'
face and toward the ?ame jet of the torch a small
6. Apparatus for controlling the spacing of a
column of conductive substance capable ‘of hav- '
torch tip from the surface of a work-piece com
ing its physical state changed by contact with
prising an electric motor for moving the torch
the ?ame jet so that when the spacing between .15 tip toward and away from the work surface,
‘ the work surface and the torch tip is relatively
_ liquid jet-producing means movable with the tip
small said column of substance will strike the
and adapted to project a ?ne jet of conductive
liquid at an angle toward the work surface and
toward the, ?ame jet of the-torch so that when
. stance will he intercepted by.the ?ame jet and the 20 the spacing between the work surface and the
portion in contactwith the ?ame will have its
torch tip is relatively‘ small the liquid jet will
physical. state changed to thereby interrupt ‘the
strike the work surface short of the ?ame jet
column, passing electric current through a cir- '
and when such spacing is relatively great the
cuit which includes said column of substance and
liquid jet will be intercepted by the‘ ?ame jet
the work-piece, and utilizing the breaking and - vand be interrupted by vaporization of the por
making of said circuit produced _upon interrup
tion of the jet in contact with the ?ame, an elec
tion of the column of substance and upon its
tric circuit of which the liquid jet and the work
striking the work surface for moving the torch tip
piece constitute a part, and relay means in said
' toward and away from the work surface.
circuit responsive to a change in current value
3. The method ‘of controlling the spacing of 30 in the circuit produced upon interruption of the
a torch tip from the surface of a work-piece
liquid jet and upon its strildng the work surface
work surface short of the ?ame jet and when said
spacing is relatively great the vcolumn of sub->
which comprises producing a jet of conductive _ ‘ for controlling said electric motor.
liquid and directing it angularly toward the work
7. Apparatus for vcontrolling the spacing of a
surface and toward the ?ame jet_of the torch so
torch tip from the surface of a work-piece com
that when the spacing between the work surface 35 prising means for moving the torch tip toward
and the torch tip is relatively small the liquid jet
and away from the work surface, liquid jet-pro
will strike the work surface short of the ?ame
ducing means movable with the tip and adapted
jet and when such spacing is relatively great the
to project two ?ne jets of conductive liquid at
liquid jet will be intercepted by the ?ame jet and '
be interrupted by vaporization of the portion of
the jet in contact with the ?ame, passing electric
current through the liquid jet, and utilizing the
an angle toward the work surface and toward
a ,the
change in value of said current produced uponv '
interruption of the liquid jet and upon its striking
the work surface for moving the torch tip toward ' 45
and away from the work surface.
4. The method of controlling the spacing of a
torch tip from the surface of a work-piece which
?ame jet of the torch so that one of said
jets is located higher than the other and so that
when the spacing between the work surface and
the torch tip, is less than the desired normal both
liquid jets will strike the work surface short of
the ?ame jet and when said spacing is greater
than the desired normal both liquid jets will be
intercepted by the ?ame jet and be interrupted
by vaporization of the portions of them in con
comprises producing a jet of conductive liquid and
tact with the ?ame and when said spacing is at
directing it angularly toward the work surface 50 the desired normal, the upper liquid jet will be.
and toward the ‘?ame. jet of the torch'so that
intercepted by the ?ame jet but'the lower liquid
when the spacing between the work surface and
jet will strike the work surface, an electric circuit
the torch tip is relatively small the liquid jet will
of which the lower liquid jet and the work-piece
strike the work ‘surface short of the ?ame jet_
constitute a part, a second electric circuit of
and when such spacing is relatively greatthe 55 which the higher liquid jet and the work-piece V .
liquid jet will be intercepted by the ?ame jet
constitute a part, and means in said circuits re
and be interrupted by vaporization of the por
sponsive to a change in current value in them
tion of the jet in contact with the ?ame,‘ passing
produced upon interruption of the liquid jets
electric current through ‘a circuit which includes i and upon their striking the work surface for.
said liquid jet and the work-piece, and utilizing 60 controlling said torch moving means. '
the breaking and making, of said circuitv pro
8. Apparatus for controlling the spacing of a
duced upon interruption of the liquid jet and
torch tip from the surface of a work-piece com
upon its striking the work surface for moving ‘ prising means for moving the torch tip toward
the torch tip toward and away from the work
and away from the work surface, liquid jet-pro
65
‘surface.
ducing means movable with the tip and adapted
5., Apparatus for controlling the spacing of a
to project two ?ne jets of‘ conductive. liquid at
torch tip from the surface of a work-piece com
an angle toward the work surface and toward
prising means for moving the torch tip toward
the heme jet of the torch so that one of said
and away from the work surface, liquid jet-pro
jets is located higher than 'the other and so
ducing means‘movablewith the tip and adapted 70 that when the desired normal‘ spacing between
to project a ?ne jet of conductive liquid at an
the work surface. and the torch tip exists the
angle toward the work surface and toward the
upper jet will be intercepted by the ?ame jet
?ame jet of the torch so that when the spacing _ and be interrupted by vaporization of the ?ame
between the work surface and the torch tip is .. contacting portion of the jet while the lower jet
relatively small the liquid jet will strike the work '15 will touch the work surface short of the ?ame
, 2,41 1,737
7
_
y
.
.
means inoperative when the tip spacing is at
the desired normal and the lower jet touches the
work surface and for rendering the torch-mov
jet and when the spacing is greater than the
desired normal both liquid jets will be intercepted
and interrupted by the ?ame Jet and when the
spacing is less than the desired normal both liquid
_ ing means operative to move the torch' tip toward
jets- will touch the work surface short ofv the
the work surface when the tip spacing is greater
?ame jet, an electric circuit of which the lower
than the desired normal and the lower liquid jet
_' is interrupted by the ?ame jet and for rendering
the torchfmoving mean-s operative to move‘ the
torch tip away from the work surface when the
liquid jet- and the work-piece constitute apart,
and means in said circuits responsive to changes. 10 tip spacing is less than the desired normal and
the higher liquid jet strikes the work surface.
in current value produced in them upon inter
liquid jet and the work-piece constitute a part,
a second electric circuit of which the higher
ruption of the jets and upon their striking ‘the
work surface‘ for maintaining the torch-moving
HENRY O. KLINKE.‘
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