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D“- 3, 1946.. I
D. F. DRIESCHMAN ETAL'
2,411,988
GRID MAKING MACHINE
Filed March 11, 1944
8 Sheets-Sheet l
‘
INVENTORS
Donald F. Dneschman- Gordon Shepherd
Mendel Rab/hmé/yz - A/mer M. NQW/ldl/L/r.
Harold E. org.
M E jg
ATTCSRNEY
Dec- 3, 1946-
D. F. DRIESCHMAN ETAL
I 2,411,988
GRID MAKING MACHINE
Filed March 11, 1944
8 Sheets-Sheet 2
INVENTORS
Donald E. Dr/eschman -?ardan Shep/verd
Mende/ kablhgyifz —14/me/' M. New/MIN.
Harold E. org.
M 5 i1,
Dec. 3, 1946. -
D. F. DRIESCHMAN ET AL-
2,411,988
GRID MAKING MACHINE
Filed March 11, 1944-
8 Sheets-Sheet 5
INVENTORS
Dana/d E Driesc/rman-Gardon Shepherd
Mendel Fab/rmu/ifz-A/mer M. N€Wb?//t/z
BY
?aro/d E. org.
M5
ATTORNEY
Dec- 3, 1946-
D. F. DRIESCHMAN ETAL
2,411,988
GRID MAKING MACHINE
Filed March 11. 1944
ILL-.5
8 Sheets-Sheet 4
Dec. 3, 1946.
D. F. DRIESCHMAN ETALq
2,411,988
GRID MAKING MACHINE
Filed March ll,v 1944
8 Sheets-Sheet 5
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Wm
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Dec. 3,- 1946.
D. F. DRIESCHMAN ET AL
2,411,983
GRID MAKING MACHINE
Filed March 11, 1944
8 Sheets-Sheet 6
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Dona/dliDr/esch
Mandel Rab/nan/if
INVENTORS
ATTO'RNEY
Dec. 3, 1946.
2,411,988
D. F. DRIESCHMAN EI'AL
GRID MAKING MACHINE
Filed March 11, 1944
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Patented Dec. 3, 1946
2,411,988
UNITED STATES PATENT OFFICE
2,411,988
GRID MAKING lVIACHINE
Donald F. Driesclunan, San Carlos, Gordon Shep
herd, Burlingame, Mendel Rabinawitz, San
Francisco, Almer M. Newhall, Jr., Palo Alto,
and Harold E. Sorg, Redwood City, Calif., as
signors to Eitel-McCullough, Inc., San Bruno,
Calif., a corporation of California
Application March 11, 1944, Serial No. 526,092
17 Claims.
Our invention relates to apparatus for making
grid electrodes for electron tubes. This applica
tion covers the machine, the method being claimed
in our copending application, Serial No. 526,093,
and the product being claimed in our ,copending
- application Serial No. 526,091.
It is among the objects of our invention to pro
vide an automatic machine for making grids,
whereby the latter are produced more rapidly,
with less labor and under controlled conditions
yielding a uniform product.
The invention possesses other objects and fea
tures of advantage, some of which, with the fore
going, will be set forth in the following descrip
- tion of our invention. It is to be understood that
We do not limit ourselves to this disclosure of
.species of our invention as we may adopt variant
embodiments thereof within the scope of the
(01. 219-4)
2
another wire helically about the bars, and means
for uniting the wires at their intersections. By
this arrangement the grids may be formed con
tinuously on a mandrel. Means-are also provided
for varying the pitch of the winding at intervals
along the axis, and means are further provided
for controlling the pitch varying means to provide
close-turn end rings on the grids and open turn
helices between the end rings. Means are still
10 further supplied for severing the Wires between
adjacent end rings to separate the grids. Special
features are also incorporated in numerous detail
parts of the apparatus, such as the winding mech
anism, welding device and timing system.
In greater detail, and referring to Figure 1 of
the drawings, our apparatus is designed to auto
matically fabricate a grid comprising a plurality
of longitudinal wire bars 2 spaced about the grid
claims.
axis. These bars are parallel and lie in cylindrical
Referring to the drawings:
20 formation about the axis. The longitudinal grid
Figure 1 is a side elevaticnal view showing a
bars are held by another wire wound about and
completed grid and also a series of grids as made
welded to the bars, this winding being applied
on a mandrel by our machine.
Figure 2 is a side elevational view of our ma
chine; and
Figure 3 is a plan View of the same.
Figure 4 is a rear end elevational view showing
the supply rolls for laying the longitudinal grid
bars on the mandrel.
Figure 5 is a transverse vertical sectional view
taken in a plane indicated by line 5-5 of Figure
3, showing the winding head.
'
Figure dis a longitudinal vertical sectional View
taken in a plane axially of the mandrel through
the winding head.
to form close-turn end rings 3 and 4 on each grid
and an open-turn helix 6 between the end rings.
25 Base ring 3 to which the grid supports are usually
connected is preferably wider than the top ring,
governed by the number of close turns provided,
as shown on the completed grid at the right in
Figure 1.
This grid structure is adapted for being made
continuously on a mandrel ‘I by simply laying the
longitudinal wires 2 to form a connected series
of grids and then forming the end rings 3 and 4
and helices 6 by a continuous winding operation.
After the winding has been applied and welded
.the wires are severed in transverse planes be
Figure '7 is a detail sectional view showing the
welding roller mounting, taken in a plane indi
.tween adjacent end rings to separate the grids.
catedby line 'l—'l of Figure 5; and
This severing may be done by any suitable means
Figure 8 is another sectional view of this struc
as by a knife 8. As the mandrel may be injured
ture, taken in a plane indicated by line 8-8 of 40 by this cutting operation we prefer to strip the
Figure 5.
connected grids from the winding mandrel and
» Figure 9 is a fragmentary sectional view show
ing the slide .contactor for the winding head, taken
in a plane indicated by line 9-9 of Figure 2.
:slip them on a core of harder material.
Frame structure and mandrel guides.—-Refer
ring to Figures 2 and 3, our machine comprises
Figure 10 is a detail sectional view of the cam 45 a ?xed frame including a bed plate 9 supported
mechanism which controls axial movement of the
on side channels I l and carrying a transverse up
winding head, taken in a plane indicated by line
right plate 12 between braces [3, upon which the
|il~—i 0 of Figure 2.
various components of the apparatus are mounted.
Figure 11 is a detail sectional view of the wind
A central aperture is provided in plate [2 through
ing head drive gearing, taken in a plane indicated
which mandrel ‘l advances (Fig. 6). For con
byline I I--l I of Figure 5.
venience in making the grids a plurality of man
In terms of broad inclusion, our grid making
drels are employed, each about three feet long.
apparatus comprises means for laying a plurality
These are held in axial alignment on opposite
of “wires longitudinally of an axis to form bars
sides of plate 12 by V-shaped guides l4 and [5.
for a connected series of grids, means for winding
One mandrel section follows immediately behind
2,411,988
3
4
the other so that in effect a continuous mandrel
is provided. A flat tip IS on one end of each
a stub shaft 69 projecting from bracket ‘II also
mandrel section engages a slot in the end of an
two large gears on the winding head are rotated
other section to restrain the mandrels .against
relative rotation.
M andrel feed mechanism.-—Means are provided
for feeding the mandrels axially through the ma
12 mounted on the winding head for movement
chine.
secured to plate i2. By this arrangement the
at different speeds.
Referring to Figures 5 and 6, the helical wind
ing is applied by wire from a supply roll or reel
For this purpose two sets of drive rollers " " ‘ in a path about the mandrel.
The reel is jour
l1 and [3 are arranged to engage opposite sides .
naled on a stub shaft 73 projecting from front
of the mandrels, the rear set I‘i being driven at
a slightly faster rate to insure tight abutment
of the mandrel sections. Rollers H are friction
ally held on their shafts by springs I9 to allow
gear 51 of the winding head, and is resiliently held
by a spider 1e pressed by spring 16. Wire from
this reel is directed onto the mandrel by an aper
tured guide tip l7 supported adjacent the mandrel
for a degree of slippage. ‘Figures 2 and 3 show 7
by a bracket 18 mounted on the face of gear 51.
The wire is thus applied as a helical wrapping
over the longitudinal bars by reason of the com
bined rotational movement of the winding head
and axial movement of the mandrel. Since one
these drive rollers mounted on shafts 2i jour
naled in a gear box 22. A cross shaft 23 is geared
to the roll shafts by worm drives 24, the cross
shaft being connected through a gear train “26
mandrel section follows immediately behind the
to the main drive shaft 21 extending along the
bed of the machine and journaled in bearings 28. 20 other the grids are made continuously.
Pitch varying mechanism.—Means are pro
I By this driving arrangement the mandrels are
axially moved at a constant'speed through the
" wire winding mechanism.
Longitudinal wire laying mechanism.-Means
" are provided for laying wires 2 longitudinally of
0::
Au
axially relative to the mandrel by a cam mecha—
nism. As shown in Figures 2, 3 and 6, a. cam 8|
engages a foilower roller 82 on the end of slide
rod 419. Contact between the follower and cam
As best shown in Figures 4 and 6,
1' va circular guide collar 28 is disposed about the
" month of the aperture in plate l2 for directing
"the wires inwardly along the mandrel. Wires 2
' the mandrel.
- are drawn from a series of supply rolls or reels 30
2' ‘3| circumferentially spaced about the mandrel
"axis and journaled on stub shafts 32 projecting
vided for varying the pitch of the winding at
intervals along the axis to form close-turn end
rings 3 and e and open-turn helices 6 on the grids.
To accomplish this the winding head 42 is moved
is maintained by a pair of springs 83 interposed
between block 52 and plate l2. See Figure 10.
Cam 8! is carried by a shaft 84 journaled in
tionally'held by spiders 33 pressed by springs 34.
housing 85 and connected to a cross shaft 81 by
worm gearing 88. The cross shaft is in turn con
1 Wires 2 pass through a sleeve 36 slidably mounted
' ' nected to main drive shaft 2‘! by a gear train 89.
-> from the rear of plate l2.
These reels are fric
Winding head 152 is thus caused to move forward
with but slightly slower rate than the mandrel
to form a pair of adjacent end rings 3 and 4, the
T bly engages the mandrel to support the latter and
cam being shaped to slow down a portion of this
."has a- 'series of radial guide slots 38 through which
. the wires pass. Centering lugs 4| projecting in 40 movement to provide some space between the
two adjacent end rings so that the grids may be
. wardly adjacent the rear end of sleeve. 36 serve
' in a hollow hub 31 which projects from the front
' side ofjplate l2. A guide tip 38 on sleeve 3'5 slida
as another support for the mandrel. See Figures
subsequently separated at this point.
On the
return stroke of the winding head the latter moves
contra to the mandrel and forms the open turn
' for applying the helical winding on the grids. For 45 helix 6.
Guide tip 38 for the longitudinal wires is main
. this purposea winding head generally indicated
tained closely adjacent to-winding guide ‘I1 by a
> by ‘numeral. 42 is mounted for rotation about the
yoke 8i secured to gear 51 and engaging a groove
‘ mandrel. This‘ head comprises a center sleeve 43
in tip 38 so that sleeve 38 slides back and forth
encircling hub 31 and journaled in a main bear
with the winding head. Guide tip 38 is held
- ing M held by a housing 86, the bearing assembly
against rotation by a ?xed lug 92 engaging a slot
‘ being retained by rings .47 and 48. In order to
93 in the sleeve.
‘_ permit axial as wellas rotational movement of
Welding mechanism-Means are provided for
' the windingihead, bearing housing 46 is supported
welding the wires together at their intersections
I‘ on a slide rod d9 by arms 5! fastened to a block
immediately upon application of thehelical wind
- 52 secured tothe rod. Slidable support for the
ing. As seen in Figures 5, 7 and 8, a welding elec
\ rod is provided by a collar 53 on plate I2 and a
f 5, 6 and 8.
" Wire winding mechanisr".-—'-Means are provided
- forward bracket 55 on bed plate 9.
Centering of
i_ sleeve 133 on hub 31 is maintained by bearing rings
'56.
See Figure 6. i
'
trode or roller 56 is carried on one end of an
arm 8i which swings about a shaft 98 on a bear
ing 99, the roller assembly being counterbalanced
5A pair of large gears including a front gear 51 60 .by a weight NH to compensate for centrifugal
force. Roller 96 is positioned to ride on the wire
-~' and a back-gear 58 are embodied in the Winding
being wound and is arranged to engage each in
head mechanism. Front gear 51 runs at the speed
tersection immediately upon formation thereof at
' of‘ the head and is ?xed to center sleeve 43. Back
the point where the wire being wound approaches
'0 gear 58 is ?xed to a second sleeve 59 which is
'
>_
‘
loosely'journaled on center sleeve 43 by a bearing 65 the mandrel,
Means are also provided for resiliently pressing
"ring 82.‘ The'back gear is used for driving part
of the'welding device as hereinafter described.
‘Both gears are rotated from main drive shaft 2'!
by a gear 63 on the latter meshing with an idler
'64 vjournaled on stub shaft 66 projecting from
bracket G'lsecured to plate i2. See Figures 5' and
.‘1‘1'. Idler 64 meshes with a double gear 68 which
=has asection of one diameter engaging front gear
Welding roller 98 against the wire. The roller
mount comprises an axle I82 ?xed to arm 91
and carrying a sleeve I03 upon which roller 96
A lateral
0 and its pinned hub I04 are journaled.
arm I86 is threaded to sleeve‘ I03 and has an
inturned end secured to ‘a. strip I01 against
which spring l??bears. An adjustingscrew I09
on a stud Ill secured to gearv5l provides means
.5] "and a section of another diameter'engaging
.l'backgear. 58', the double gear beingijournaled on 75 :forvarying the spring” pressureon“ the Welding
2,411,988
:r'oller. A third arm II2 pivoted between arm
each revolution when the crank arm rides on
?at I46. Since pinion I41 runs in timed rela
tion with the winding head, the opening and
I08 and the face of gear 51 is arranged parallel
to arm 9‘! to stabilize the linkage.
Means are further provided for positively driv
ing welding roller 95 at a peripheral speed suffi
cient to maintain a non-slipping rolling contact
between the roller and wire. This eliminates dis
turbing the positions of the wires, which would
timing the welding operation. Complete connec
98. By this arrangement the welding roller is
their respective slots 39 in guide tip 38. The
closing of the switch will function as means for
tions from leads I42 and I43 to a control circuit
for the transformer are not shown as this will be
clear to those skilled in the art. The timer de
occur if frictional contact with the wire were
vice may be advanced and retarded by moving
relied upon to turn the roller. Referring to 10 handle M8 to turn the entire switch about the
Figures 2, 5 and 8, a chain H5 is connected be
axis of pinion I41, thus changing the instant at
tween a sprocket ill on hub ltd and sprocket
which the switch closes relative to the rotation
II 8 on shaft 98. The latter shaft is driven by
of the pinion.
back gear 58 through a planetary gear system
OpeTation.—Befo-re starting the machine a
comprising sun gear H9 on sleeve 59 meshed 15 mandrel is inserted through the winding‘head
with a planet pinion i2i on the rear end of shaft
and the longitudinal wires 2 are threaded through
independently driven at a predetermined rate to
maintain the desired rolling contact between it
and the wire.
Means are also provided for supplying electrical
current to the necessary parts for making the
welds. In order to complete the electrical cir
cuit we use mandrel ‘I as one of the welding elec
trodes, both the mandrel and roller electrode 96
being preferably of copper. Contact with the
mandrel is made by a pair of brushes I22 pivoted
ends of these wires are secured or clamped to
the end of the ?rst mandrel by any suitable
means so that when the machine is started the
wires will be peeled from reels 3| and laid along
the mandrel by axial movement of the latter.
The wire from reel 12 is then threaded through
its guide ‘l? and suitably secured about the man
drel so that when head 42 starts turning the
wire will be wound.
,
The driving motor of shaft 2? is then started
to housing 22 (Figure 2) and held together against
the power for the welding circuit turned
the mandrel by a spring I23. As shown in Figure
on. This starts the mandrel feeding through
3, a conductor I24 extends from one of these 30 the machine by the driving action of rollers I8.
brushes to the welding transformer I26. Another
Simultaneous rotation of winding head 42 ap
oonductoryIZ‘I from the transformer leads to a
plies the helical wrapping, each intersection be
terminal I28 on one of two conductive straps I29
ing welded by the synchronized welding mech
supported by and insulated from block 52.
anism. New mandrel sections are fed, one be
Straps I29 project upwardly to a slide contact the other, to drive rolls I‘! so that grid
device for feeding the current to the roller elec
fabrication proceeds continuously. As soon as
trode. As shown in Figure 9 the contact device
a mandrel section advances a distance along the
comprises a brush I3I connected to a strap I29
front guide trough I5 the mandrel is discon
by a ?exible conductor I 32. Brush igl slidably
nected from the trailing one by cutting the wires
engages a conductive ring I33 secured to the back 40 at the junction between the mandrels. This is
side of front gear 51 and insulated therefrom by
done while the mandrels are in motion and with
an insulating ring I34. Brush pressure is main
out stopping the machine.
tained against ring I33 by a spring pressed arm
The removed mandrel has a chain of say
I35 pivoted to the other upright strap I29. From
twenty-?ve or more grids on it. If the mandrel
collector ring I33 the current passes through
is sufficiently hard the individual grids may be
stud III (Figure 7) which is also conductive and
cut apart directly on it by rolling under the knife
insulated from gear 51 by bushing I31. A flex
8 shown in Figure 1. Since the mandrel is used
ible conductive strap I38 is connected between
over and over it may be damaged by the knife. so
stud III and arm Hi6. To allow ample freedom
we prefer to strip the chain of grids from the
of movement this strap is made in the form of 50 mandrel and slip them on a core of harder ma
a loop as seen in Figure 5. From arm I06 the
terial for the cutting operation. The connected
current passes to roller electrode 96 by the con
grids are easily stripped by applying tension at
tact surface between the arm and hub I4, the
one end. If necessary. the grids may be ?rst
same being pressed together by a spring I39 inter
loosened by rolling the mandrel between two
posed between the outer side of roller 96 and the
surfaces. After being separated the free ends
end of axle I2.
of the wires are preferably trimmed up close to
Welding timer.—Means are provided for timing
the end rings to produce the ?nal grid as shown
the intermittently applied welding current so that
at the right in Figure 1.
the current ?ows only during the interval when
We claim:
roller electrode 96 is on an intersection or cross
1. Apparatus for making grids, comprising a
over of the wires. Any well known means such as
mandrel. means for axially moving the mandrel,
Ignitrons may be employed in the primary cir
mechanism operable upon movement of the
cuit of the welding transformer for interrupting
mandrel for laying a plurality of wires l0hgi~
the current. We control the ?ring of the Igni
tudinally along the mandrel. means for winding
trons by a timer switch shown in Figures 2 and 5
another wire helically about the mandrel, and
comprising a pair- of contacts I4I one of which
.means for uniting the wires at intersections
is ?xed and connected to a lead I42 and the
thereof.
other of which is movable and connected to a
2. Apparatus for making grids, comprising a
lead I43. The movable contact is mounted on
mandrel, means for axially moving the mandrel,
the arm of a bell crank I44, the other arm of 70 mechanism operable uponmovement of the man
which rides on a cam having a ?at I 46. This
drel for laying a plurality of wires longitudinally
cam is rotated by a pinion I41 meshed with back
along the mandrel. means for winding another
gear 58. Contacts I 4! are normally held open
wire helically about the mandrel, means for mov
by the bell crank arm riding on the cylindrical
ing the last mentioned means relative to the
surface of the cam, but are closed once during
mandrel for varying the pitch OfthBfWiIldilIlE,
2,411,938
7
8
and means for uniting the wires at intersections
eluding a roller electrode carried by said head
for welding the wires at intersections thereof,
thereof.
.
3. Apparatus for making grids, comprising a
mandrel, means for axially moving the mandrel,
means for laying a plurality of wires longitudi
and a planetary gear system for driving said
nally. along the mandrel, said means including a
series of supply rolls of said wires circumferen
frame, a mandrel, means on the frame for axially
electrode.
10. Apparatus for making grids, comprising a
moving the mandrel, a series of supply rolls of
wires arranged on the frame circumferentially
spaced around the mandrel, guide means on the
frame for directing said wires longitudinally
along the mandrel, a rotatable winding head on
the frame encircling the mandrel, a supply roll of
another wire on said head, guide means on the
head for directing said other wire in a helical
winding about the mandrel, and means for
uniting the wires at intersections thereof.
tially. spaced around the mandrel, means for
winding another wire helically about the man
drel, said last mentioned means including a sup
ply roll of said other wire movable in a path
around the mandrel, and means for uniting the
wires at intersections thereof.
4. Apparatus for making grids, comprising a
mandrel, means for axially moving the mandrel,
means for laying a plurality of wires longitudi
nally along the mandrel, said means including
a series of supply rolls of said wires circumfer
entially spaced around the mandrel, means for
winding another wire helically about the man
11. Apparatus for making grids, comprising a
metallic mandrel, means for axially moving the
mandrel, mechanism operable upon movement of
the mandrel for laying a plurality of wires
longitudinally along the mandrel, means for
winding another wire helically about the man
drel, said last mentioned means including a
supply roll of said other wire movable in a path
around the mandrel, means for moving the last
mentioned supply roll axially relative to the man
drel, an electrode engageable with an intersection
of the wires, and means for passing an electric
current through the electrode and mandrel and
drel for varying the pitch of the winding, and
means for uniting the wires at intersections
the interposed wires to weld the latter together.
12. Apparatus for making grids, comprising a
metallic mandrel, means for axially moving the
thereof.
5. Apparatus for making grids, comprising a
mandrel, means for laying a plurality of wires
longitudinally along the mandrel, means for
winding another wire helically about the man
drel, a roller electrode riding on the last men
tioned wire and engageable with successive inter
sections of the wires, and means for passing an
electric current through the electrode and man
rotatable winding head, a mandrel, means for
axially moving the mandrel through said head,
mechanism operable upon movement of the man
drel for laying a plurality of wires longitudinal
ly along the mandrel, guide means on the head
for directing another wire in a helical winding
about the mandrel, and means for uniting the
drel and the interposed wires to weld the latter
wires at intersections thereof.
6. Apparatus for making grids, comprising a
together.
13. Apparatus for making grids, comprising a
rotatable winding head, a mandrel, means for
axially moving the mandrel through said head,
metallic mandrel, means for axially moving the
guide means for directing a plurality of wires 40 mandrel, means for laying a plurality of wires
longitudinally along the mandrel, guide means
longitudinally along the mandrel, means for
on the head for directing another wire in a
winding another wire helically about the mandrel,
helical winding about the mandrel, mechanism
a roller electrode riding on the last mentioned
synchronized with rotation of said head for mov
wire and engageable with successive intersections
of the wires, means for driving the roller elec
‘ing
‘to vary
the the
head
pitch
axially
of therelative
winding,toand
themeans
mandrel
for
trode, and means for passing an electric current
uniting the wires at intersections thereof.
through the electrode and mandrel and the in
7. Apparatus for making grids, comprising a
terposed wires to weld the latter together.
rotatable winding head, a mandrel, means for
14. Apparatus for making grids, comprising a
axially moving the mandrel through said head, £10 frame, a bearing on the frame, a mandrel, means
guide means for directing a plurality of wires
for axially moving the mandrel through said
longitudinally along the mandrel, guide means
bearing, guide means on the frame for directing
on the head for directing another wire in a
a plurality of wires longitudinally along the man
helical winding about the mandrel, and means
drel, a winding head journaled in, said bearing,
including an electrode carried by said, head for
and means on the head for directing another
welding the wires at intersections thereof.
8. Apparatus for making grids,_comprising a
rotatable winding head, a mandrel, means for
axially moving the mandrel through said head,
guide means for directing a plurality of‘ wires
wire in a helical winding about the mandrel.
15. Apparatus for making grids, comprising a
frame, a bearing movably mounted on the frame,
00
longitudinally along the mandrel, guide means
on the head for directing another wire in‘a helical
winding about the mandrel, and means includ
ing an electrode carried by said head for weld
ing the ‘wires at intersections thereof, said elec- I‘
trode being arranged to vcontact an intersection
at the point where the wire being wound ap
proaches the mandrel.
'
9. Apparatus for making grids, comprising a
rotatable winding'head, a mandrel, means for
axially moving the mandrel through said head,
‘guide means for directing a‘ plurality of'wires
longitudinally along the mandrel, guide means
on the head for directing'another wire in- a
helical winding about the-mandrel, means in 75
a mandrel, means for axially moving the mandrel
through said bearing, guide means on the frame
for directing a plurality of wires longitudinally
along the mandrel, a winding head journaled in
said bearing, means on the head for directing
another wire in a helical winding about the
mandrel, and means for axially moving the bear
ing for varying the pitch of the winding.
16. Apparatus for making grids, comprising a
plurality of mandrels'disposed end-to-end, means
for axially moving the‘mandrels, mechanism op-'
erable upon movement of the mandrels for lay
ing a plurality of wires longitudinally along the
mandrels to form bars for a connected series
Lof' grids, means for winding anotheriwire heli
2,411,988
cally about the mandrels, and means for uniting
the wires at intersections thereof.
1'7. Apparatus for making grids, comprising a
mandrel, means for axially moving the mandrel
without rotation, means for laying a plurality of 5
wires longitudinally along the mandrel, means
for winding another wire helically about the
10
mandrel, and means for uniting the wires at
intersections thereof.
DONALD F. DRIESCHMAN.
GORDON SHEPHERD.
MIENDEL RABINAWITZ.
ALMER M. NEWHALL, JR.
'
HAROLD E. SORG,
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