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Патент USA US2519789

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Aug 22, 1950
w. J. OESTERLEIN
2,519,784
WELDING TRANSFORMER
Filed Nov. 2, 1946
5 Sheets-Sheet 1
“'3
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INVENTOR _
ATTORNEY
Aug- 22, 1950
w. J. OESTERLEIN
2,519,784
WELDING TRANSFORMER
Filed Nov. 2, 1946
5 Sheets-Sheet 2
BY
_
ATTORN EY
Aug. 22, 1950
w. J. OESTERLEIN
2,519,784
WELDING TRANSFORMER
Filed Nov. 2, 1946
3 Sheets-Sheet 3
‘W
Q“
JNVENTOR.
?VMI/QQ
BY [15164444751
w
Patented Aug. 22, 1950
2,519,784
UNITED STATES PATENT OFFICE
2,519,784
WELDING TRAN SFORMEB
William J. Oesterlein, Wauwatosa, Wis., assignor
to Harnischfeger Corporation, Milwaukee, Win,
a corporation 01’ Wisconsin
1
Application November 2, 1946, Serial No. 707,472;
3 Claims. (Cl. 171-419)
This invention relates to transformers adapted
2
broken away and in section of the apparatus
to supply a regulatable output of alternating cur
shown in Fig. 1;
rent suitable for arc welding and it resides more
Fig. 3 is a diagrammatic showing of the trans
former frame and windings of the apparatus
of Fig. 1, shown in the position of adjustment
speci?cally in an improved form of 'such appa
ratus in which primary and secondary windings
are relatively movable with respect to one another
and in which parts of the transformer frame
are relatively movable with respect to one another
at which maximum output is obtained;
I
Fig. 4 is a diagrammatic showing of the trans
former frame and windings of the apparatus of
Fig. 1 shown in the position of adjustment in
in company with movement of the windings so as
to bring about a marked alternation in the cou 10 which output is at a minimum;
pling between the windings with a relatively small
Fig. 5 is a side view with parts broken away
movement of movable parts.
In a transformer of the type suitable for sup
plying regulated alternating current output suit
of another form of the apparatus of this inven
tion; and
Fig. 6 is an end view partly in section of a part
able for electric arc welding it has heretofore 15 of the apparatus shown in Fig. 5, viewed through
been common to provide a transformer frame of
the broken planet-6 there indicated.
sufiicient length to permit primary and secondary
As shown in Figs. 1 to 4 the transformer of
windings to be adjustably separated to such an
this invention may include a stationary frame
extent that ?ux leakage in substantial amount
member, made up for convenience from two built
can pass between the separated windings. In this 20 up, laminated, P-shaped members I and 2 placed
way coupling and current output are progressively
back to back and rigidly assembled between up
restricted as the windings are separated. The
per clamp pieces 3-3 and lower clamp pieces 4-4.
regulation thus produced is satisfactory for most
The frame members i and? each are provided with
ordinary uses but in order to accomplish the same
gaps ii and 6 respectively in the upper portions
a very substantial adjusting movement is re 25 thereof, as shown, through which movable regu
quired and the apparatus as a whole is of large
lating tongues ‘i and 8 built up of laminated ma
external dimensions so as to permit the large
terial are admitted.
separation of windings required.
The tongues “i and 8 are securely clamped to a
Through the use of the apparatus of this in
cross bar ii by means of end brackets in and M
vention the movable parts need be moved but a 30 which have laterally extending guiding ears with
small fraction of the distance heretofore consid
openings therein slidingly received upon guide
ered necessary in order to vary the output of the
rods i2 and
The guide rods i2 and it are
transformer throughout its complete range of ad
in turn rigidly mounted upon base members it
justability. At the same time the overall dimen
and iii bolted rigidly in place upon the clamp
sions of the apparatus may be markedly reduced
pieces
interposed between the ears of brackets
permitting a more compact and economical con
it and i i on the one hand and the base members
struction. In use, greatly increased convenience
it and it on the other hand are counter-bal
results, since an operator desiring to change the
ancing springs 06 and ii so proportioned as to
output being utilized, need shift a regulating
sustain a substantial part of the weight of the
member but a short distance, in contrast with the 40 tongues ‘i and t and associated parts in any ad
numerous turns heretofore necessary with the
justed position of vertical movement.
usual screw regulator in apparatus requiring a
To provide convenient means for regulating
large amount of travel in the regulating mecha
the position of adjustment of the tongues l and
nism.
8 a sprocket chain it mounted in running en
This invention is herein described by refer 45 gagement with a sprocket i9, and sprocket 20
ence to the accompanying drawings forming a
is secured at its ends by means of bolts 2! and 22
part hereof in which there is set forth by way
to the cross member
Sprocket is is secured
of illustration and not of limitation forms in
to a supporting shaft
journalled for rotation
which the apparatus of this invention may be
in end stands 2% and 25 secured above the base
embodied.
60 members it and i 5 by bolts passing through clamp
In the drawings:
Fig. 1 is a front view in elevation with parts
broken away and in section of one form of the
apparatus of this invention;
members 3 as shown. Secured to the end of shaft
23 is a hand crank 26? by means of which adjust
ing movement may be accomplished. Sprocket 21'.“
is mounted for rotation in a bracket 27 secured
Fig. 2 is a side view in elevation with parts to to one of the clamp members 3 as shown.
2,519,784
-
3
4
As appears clearly in the drawings the frame
.
maximum rate of increase of ?ux diversion is
members I and 2 are laterally offset to provide a
still preserved.
'
bay 28 and 28 respectively for the accommodation
In another form the apparatus of this inven
of a winding 38 which preferably is‘ the secondary “
tion may be constructed as shown in Figs. 5 and
6. ‘This form of the apparatus is mounted upon
a portable frame made up of a base 38 and up
winding of the transformer, the same being of
sufficient internal diameter as to provide com
plete clearance for downward passage of the
rights 48 and 41. The base 88 is provided with
' tongue 1 and 8 and a primary winding 3| rigidly
a pair of supporting casters at one end, one of
attached by means not shown to the lower ends
which is shown at 4!. When at rest the base 38
is disposed in an inclined position bearing upon
the casters 4! and the end 42 of the base 88.
The frame also is provided with a shelf 43 ‘upon
which power factor correcting condensers 44 may
of said tongues 1 and 8 so as to move in company
therewith. An insulated terminal support 32 se
cured by bracket 33 and 34 upon the clamp piece 4
receives the terminal leads of the secondary wind
be carried.
ing 38, one of which is shown at 35. A similar in
sulating terminal support 36 held on brackets 31
receives the ?exible primary winding leads 38 as
shown in Fig. 2.
As shown in Fig. 3 when the tongue members
1 and 8 and associated winding 8| are in raised
position the ?ux path indicated by the arrows
completely embraces both windings so as to pro
duce a maximum coupling effect. In this posi
tion the transformer is capable of its maximum
output. As shown more clearly in Fig. 1 when
the tongues 1 and, 8 and associated winding 3|
are positioned in a somewhat lower position the
main ?ux ‘path indicated by solid line arrows
still embraces both windings but at the same
time a substantial part of the ?ux, as indicated
by the dotted line arrows, is free to leak through
Secured to the upright 41 and extending up
wardly therefrom is a pair of stationary non
magnetic core clamps 45 and in similar manner
a pair of stationary non-magnetic core clamps
48 is secured to and extends upwardly from the
20 upright 48. Held between the clamps 45 at
one end by the bolts 48 and at the opposite end
between the clamps 46 by the bolts 49 is a lami
nated stationary core piece 58 having an up
wardly facing notch 51. The laminations of
output. The output progressively is reduced ‘as
the apparatus is moved from the position shown
in Fig. 3 toward and through the position shown
in Fig. 1 until the position indicated in Fig. 4 is
bent into the position shown during assembly for
15
25 the core piece 58 are additionally secured as a
unitary body by means of rivets, one of which is
designated 52. A similar stationary core piece
53, spaced from, parallel to and disposed above
the core piece 58, is held between the stationary
30 core clamps 45 and 48 by bolts 54 and 55, respec
the bridge provided by the tongues 1 and 8 in
tively. The core piece 53 has a downwardly fac
such a way as to independently enclose the
ing notch corresponding to the notch 51 in core
transformer windings. In this way the cou
piece 58 and within these notches a transformer
winding 58 is received. The winding 58 is fur
pling between the windings 38 and 3! is dimin
nished with attached locating tabs 51 which are
ished and the transformer is capable of a lower
assumed.
‘
’
When. the apparatus assumes the position in
dicated in'Fig. 4. completely independent ?ux
paths as indicated by the arrows are provided
surrounding the windings 38 and 3|. In this
position the output of the transformer due to
the near absence of coupling of the windings 38
the purpose of holding the winding 56 in place.
Winding 58 as appears more clearly in Fig. 6
has a large central opening at 18', su?icient to
admit a movable laminated core piece 58 which
substantially bridges the space between station
ary core pieces 58 and 53 except for very small
air gaps as shown. The core piece 58 is notched
as shown to carry a winding 58 disposed as
shown to pass freely through the opening 18
in the winding 58. In order to positively guide
and 3| is reduced to a
From this it
the core piece 58 in its movement and to reduce
may be observed that movement of the coil 3!
friction, rollers 68 and 6! are pivotally mount
over a distance only slightly greater than its
ed in cars formed as integral extensions of the
own height is su?icient to bring about a change 50 core clamps t5, and similar rollers 82 and 83 are
in regulation from maximum output to minimum
pivotally mounted on the clamps 86. The roll
output.
ers 68-61 and 82-83 are preferably spaced
If desired, the stationary parts of the trans
vertically a distance slightly less than the verti
former frame may be made up as a single in
' cal height of the core piece 58, and are shod with
tegral, piece. It is preferred that it be divided, 55 stiff rubber or other like resilient material so as
since it is possible to make up the members i
to be under stress at all times and thus
and 2 complete in advance of the insertion of
diminish noise which might otherwise occur.
the winding 38 which may be dropped through
A ventilated housing 64 is hung as shrown
the gaps 5 and 6 and then brought to the posi
from upward extensions of the clamps 45 and 88
tion shown by‘ moving the members I and 2 to
and bears a rigidly attached hand grip 85. by
wardeach other ready for assembly with clamp
means of which an operator may lift the end 42
members 3 and 4.
of the base 39 from the floor to permit the ap
It will appear‘from inspection that either the
paratus to be rolled about on the casters Iii.
frame member i together with its adjustable
Directly below the hand grip 65 is an aperture
leg 1 of the frame member 2 with its adjustable a in the housing 84 through which the end of a
leg 8 constitutes a complete‘ ?ux controlling cir
notched adjusting channel 66 projects. Pivot
cuit which might be used alone. Not only may
ally attached to the channel 66 is a swinging
adjusting ball 61 by which the operator may lift
such units be used alone or in pairs as shown
the outer end of the channel 66 from a striking
but also in any greater number, such as 3 or 4,
which space limitations will permit. In any 70 plate 68 against the action of a ?at retaining
spring 68 both mounted as shown. To permit
such arrangement the advantageous principle
of inductively related relatively movable wind- _
the lifting of the outer end of the channel 86
ings disposed within a frame forming a ?ux
the inner end of the same is pivotally attached
through a pin 18 to a stud 1| secured in the end
path and with a movable frame member which
follows the movable winding to provide fora 76 of the movable core piece 58. Pin 18 is made of
2,519,784
such length as to extend a substantial distance
laterally beyond the sides of channel 56 to pro
another, a stationary winding received within
and movable core members move farther away
the same.
said notches and having an open center of trans
vide means for attachment of the outer ends of
verse dimension not less than the spacing be
a pair of returning tension springs one of which
tween said stationary ?eld members, a parallel
is shown in fragmentary form and designated 12 CI sided movable magnetic core adapted to bridge
in Fig. 5. The opposite ends of springs 12 are
the space between said stationary frame mem
secured as shown to the clamp members 45. To
bers and to move rectiiinearly through the open
guide the user, an indicating scale 13, calibrated
ing in said stationary coil in the direction of the
in terms of output of the apparatus in various
length or‘ said stationary frame members dis
adjusted positions, may be marked on a face 10 posed between said frame members, said core
of the channel 66 as shown.
having oppositely positioned notches in the side
In use the windings 56 and 59 are connected
faces thereof adjacent the inner faces of said
by leads not shown with an alternating current
stationary frame members said notches being
power source and with work elements of an out
adapted to receive a coil movable with said core,
put circuit in known manner. The operator 15 a movable coil positioned in and ?xed with re
then shifts the channel 66 and with it the mov
spect to said notches dimensioned to enter the
able core 58 to that position in which the desired
central opening in said stationary coil, and means
output is attained. As the movable core 58 is
adapted to move said core from a position in
shifted from the position in which it is shown,
which said movable coil is within said station
toward the right, the notches in the stationary 20 ary coil toward a position where it is outside of
from registry and the leakage ?ux path is pro
gressively augmented. When the movable core
58 is in extreme right hand position, corner 15
of the movable core is in close proximity to cor
ner 14 of the stationary core so that nearly in
a
3. In a variable output transformer the com
bination comprising a pair of spaced parallel
stationary ?eld members, non-magnetic clamp
25 ing means at the ends thereof secured thereto
dependent ?ux paths for each of the windings
are provided and coupling is reduced to a mini- " '
and adapted to rigidly maintain the spacing
therebetween, a rectilinearly movable central
magnetic core of length exceeding said station
mum. The complete range of adjustment is
ary ?eld members disposed for lengthwise move
therefore obtained with a comparatively small 30 ment between the same and transversely dimen
movement as contrasted with transformers in
sioned to substantially span the space between
which adjustment is obtained by coil movement
said stationary members, said movable core mem
only.
I claim:
1. In a variable output transformer the combi
nation comprising a pair of spaced magnetic sta
tionary ?eld members, clamping means for main
taining the spaced relationship of said ?eld
members, each of said ?eld members having a
ber having notches therein adapted to receive
a movable coil, a movable coil disposed in and
?xed with respect to the notches in said movable
core, said stationary ?eld members each having
an inwardly facing notch adapted to receive a
stationary coil, a stationary coil surrounding said
movable core and winding assembly disposed in
notch on the inner face thereof, a stationary 40 the notches in said stationary ?eld members, a
winding received within said notches and hav
pair of oppositely disposed resilient rollers se
ing an open center, a movable magnetic core
cured to the clamping means at each end of said
dimensioned to closely ?t and rectilinearly move
stationary ?eld members and adapted to bear
in the space between said ?eld members and
upon the side surfaces of said movable core to
through the open center of said stationary wind 45 guide the same for movement without contact
ing, said core having notches thereon for re
with said stationary ?eld members, and means
ceiving a movable winding, a movable winding
for altering the position of said movable core.
dimensioned to pass through the open center of
WILLIAM J. OESTERLEIN.
said stationary winding mounted on and ?xed
with respect to said core notches, and means for 50
REFERENCES CITED
adjustably moving said core and associated mov
The
following
references are of record in the
able winding from a position in which said mov
able winding is opposite said stationary winding
to a position where it is adjacent thereto.
?le of this patent:
UNITED STATES PATENTS
2. In a variable output transformer the com
Number
bination comprising a pair of spaced elongated 55
890,638
parallel stationary magnetic ?eld members, non
1,478,579
magnetic clamping means engaging the ends of
1,684,746
said stationary ?eld members adapted to main
1,873,354
tain the spaced relationship thereof, each of said 00 1,942,481
?eld members having a notch on the inner face
2,270,178
thereof oppositely positioned with respect to one
Name
Date
Gehrkens ________ __ June 16,
Reynolds ________ __ Dec. 25,
Smith et a1 _______ __ Sept. 18,
Stewart _________ __ Aug. 23,
Lobl _____________ __ Jan. 9.
1908
1923
1928
1932
1934
Weis et al. _______ .._ Jan. 13, 1942
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