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Патент USA US2409994

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Oct. 22, I946.
s. H. STUPAKOFF
2,409,993v
MACHINE FOR THREADING' COIL FCRMS
Filed April 3, 1943
3 Sheets-Sheet 1
INVENTOR
S8171021 If. Swpakoff
61.44
Oct- 22, 1946.
s. H. SITUPAVKOFF
‘
2,409,993
MACHINE FOR THREADING COIL FORMS
Filed April 5, 19143 '
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INVENTOR
SamonHSturakaff ~
0a. 22,1946.
s. H. STUPAKOFF
2,409,993
MACHINE FOR THREADING COIL FORMS '
Filed April 3, 1945
3 Sheets-Sheet 5
fLlgné.
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50
.55
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.51
INVENTOR
semojz?Stgma/kaff
2,409,993
Patented Oct. 22, 1946
UNITED ‘STATES PATENT OFFICE
2,409,993
MACHINE FOR THREADING COIL FORMS
Semon H. Stupako?', Latrobe, Pa., assignor to
Stupakoff Ceramic & Manufacturing 00., La
trobe, Pa., a corporation of Pennsylvania.
Application April 3, 1943, Serial No. 481,705
7 Claims.
(Cl. 10-1)
2
1 .
This invention relates to a thread cutting ma
a supporting bed on which is a head-stock 3 an
chine, and. especially to amachine for forming
a tail-stock 6; The head stock has a shaft 5
therein with a hand wheel 6 at the outer end
thereof and a mandrel 6 at its other end over
which a cylindrical core form.“A” is ?tted. The
mandrel may be of any known or preferred con
threads on the surface of a green .ceramic coil
form.
Many types of coil forms, particularly those
used for inductances in radio transmitting ap
struction, such, for example, as that shown in
paratus, are formed of ceramic material and
my application Serial No. 468,411, ?led December
must be threaded and drilled within quite close
9, 1942. Secured on the shaft 5 inwardly toward
limits of accuracy. At present, the green ceramic
the head-stock from the mandrel is a disk 8
coil forms are threaded by acutting tool which
which is fast to the shaft to rotate therewith and
cuts a single thread at each revolution of the
which has a helical .cam surface 9 on its face.
work piece,_and the position where the thread
The tail-stock 4 may have a retractable cen
begins and ends must be closely and accurately
tering pin I 0 thereon, but this is by no means
determined, The thread on the coil form is de
signed to receive turns of wire and, at suitable 15 necessary. The tail-stock also carries a rod II
which may be rotated by a handle I2 ?xed there
places, the coil form‘has radial holes drilled there
to but which is ?xed against longitudinal move
in through which terminals of the wire are passed.
ment. Splined to the inner end of the rod II is
As the length of wire is critical, and the holes
a hob or cutter comb I3 which preferably com
must be properly positioned with respect to the
threads, the operation is one which has required 20 prises a cylindrical metal body having a thread
I4 cut in the periphery thereof and from which
care and skill.
a quadrant has been removed, as indicated at I 5.
The present invention provides a simple mech
When the quadrant is toward ‘the work piece A,
clearance is provided between the work piece and
the cutter, enabling the Work piece to be put on
and removed from the mandrel. When the shaft
anism in which the complete threading operation
is accomplished normally with but a single revo
lution of the work piece.
This is accomplished by providing a rotatable
I I is rotated, a face of the quadrant may be turned
to a position to cut into the periphery of the
work piece. The thread I4 on the hob or cutter
tion to engage a work piece on the work holder.
The number of cutting teeth on the hob or comb 30 .corresponds to'the thread to be reproduced on
the periphery of the work piece.
corresponds to the number of threads to be formed
A spring I6 on the shaft II con?ned between
and cam means are provided thereby, with one
the tail-stockfand the cutter or hob I3 urges the
revolution of the work piece, relative movement
cutter or hob toward the left as viewed in Figure
in an axial direction equal to the pitch of the de~
1. On the end of the hob is a projecting pin I‘!
sired thread takes place between the hob or comb
that rides against the cam surface 9 on the disk
and the Work piece. Where it is desired to slight
work holder with a thread cutting hob or comb
positioned alongside of it to be moved into posi
8. By reason of this arrangement, the cam will
impart longitudinally travel to the cutter or hob
I 3 as the shaft 5 is rotated to turn the work piece.
My invention may be readily understood by ref - v 40 The inclination of the cam 9 is equal to the pitch
of the thread to be formed, so that with one com
erence to the accompanying drawings, in which:
plete revolution of the work piece the cutter will
Figure 1 is a side elevation of a machine em
move ‘relatively to the work piece the pitch of one
bodying my invention;
thread.
_
Figure 2 is a transverse section in the plane of
’ 1y extend the thread, as for example, to avoid any
seam or blind spot, means is provided whereby
slight additional movement may occur.
line II-—~II of Figure 1;
1
45
'
Figure 3 isa fragmentary view partly in side
elevation and partly in longitudinal section of a
modi?ed form of mechanism;
’
The cam, mandrel and cutter are set up in pre
determined relation for the work piece to be op
erated upon, so that when the Work piece is pushed
onto the mandrel until it hits abutment pin it,
the thread cutting operation will begin at a given
Figure 4 is a transverse section in the plane of
50 distance from the‘end of‘ the work piece and one
line IV--IV of Figure 3;
complete turn of the work piece will normally
Figure 5 is a side elevation of still a further
modi?cation.
.
Figure 6 is a top plan view of a modi?cation in
which an abrasive wheel cuts the threads.
Referring ‘?rst to Figures 1 and 2, 2 designates
conclude the thread cutting operation. The cut
ting of a quadrant from the periphery of the
otherwise cylindrical cutter I3_ not only provides
an efficient cutter that may be easily sharpened
’
2,409,993
3
.
from time to time, but provides clearance to en
able the Work piece to be applied to and removed
from the mandrel. vThe work piece is turned by
turning the handwheel 6,
_
4
The shaft 46 is held against longitudinal move
ment. It carries on its inner end the thread
cutting hob or cone 48, corresponding to the ‘
cutter I3 of Figure 1 which, however, in the
modi?cation shown in Figure 5, is fixed against
longitudinal movement on the shaft 45.
In using the machine shown in Figure 5, the
handwheel is turned to a point where the pin
In some cases the thread may not be out en~
tirely clean on one complete revolution or may
not be quite continuous and fully developed at
the point marking the normal beginning of the
threading operation, which also is the point of
45 engages the low point on the cam 45. The
ending after one complete {revolution of the work 10 shaft 46 is turned so that the quadrant cut from
piece, and to eliminate this a slight overtravel may
the periphery of the cylindrical cutter is toward
be, in some cases, desirable. This can be accom
the mandrel, thus enabling a work piece to be
plished in a number of ways and Figures 3 and 4
slipped onto the mandrel, as described in con
illustrate one way of doing it, and in these ?gures
nection with Figure 1, after which the shaft 46
we have shown only a par-t of the machine. of 15 is turned to bring the cutter into engagement
Figure 1 which, but for the modi?cation to be
with the periphery of the work piece. The hand
described, is the same.
wheel 39 is then rotated through one complete
In these ?gures, the head-stock 25 carries a
turn, and, as it rotates, the pin 45 bearing against
shaft 21 similar to shaft 5 with a handwheel, not
the cam 44 causes the shaft with its work piece
shown, at one end and a mandrel, not shown, at
to travel longitudinally relative tothe threading 7
the other end. Splined on the shaft 2| is a cam
comb a distance equal to the pitch of the thread
member 22 similar to disk .8 with its cam sur
to be cut.
face 9.
In the modi?cation shown in Figure 6, I have
illustrated the threading comb as comprising a
A spring 23,, bearing against the sur
face of the cam disk 22 and con?ned by a col
lar 24 constituting an abutment, urges the cam
toward the left as viewed in Figure 3.
Around the shaft 2| in the head-stock 26 is
motor driven abrasive wheel with a serrated pe~
riphery. It may be used in an arrangement where
either the comb or the work piece moves axially,
but in Figure 6 the arrangement shown is simi
lar to that of Figure 5 in which the work piece
moves, and the cam for moving thework piece
a sleeve 25 having pins 26 projecting through
slots 2'! in the head-stock. These pins are en
gaged in the arms 28 of a yoke-like lever hav
ing a handle 29, the arms being pivoted near the
base of the head-stock. By moving the lever
is not shown;
29 back or forth, the sleeve 25, which bears against
may be moved back and forth along the shaft
the cam relative to pin [1 on the cutter. Thus,
after one complete turn of the work piece, the
lever 29 may be moved toward the right a dis
tance equal to one thread, after which the turn
ing of the work piece may be continued for per
haps 1c, 15 or 20° to assure a slight overtravel
of they cutter and clean any thread which is not
In this ?gure, A is a work piece
on a mandrel or shaft 50, similar to the shaft
the end of the hub 22a of the cam member 22,
to effectively change the operating position of
,
35
of Figure 5. The bed rails of the lathe are des
ignated 5i, and 52 is a carriage with a crossfeed
screw 53 for moving the tool post 54transverse
ly. The tool post is of special form, carrying a
small motor 55 driving a shaft 56 on which is a
threading comb comprising an abrasive cylinder
51 with a series of teeth 58 on the periphery.
,
In use, the motor drives the abrasive. comb
at high speed. When it is operating, theyopera
tor moves the comb into engagement'withthe
work piece. Then the work piece is rotated by
sufficiently formed on one turn.
45 hand, as previously described, and atthe-same
A spring detent 35 under the handle 29 may
time moves longitudinally the distance of the
engage notches 3| on the top of the head-stock
pitch of the thread. This threads the workpiece.
for indexing and releasably holding the lever 29
The abrasive Wheel is then retracted and the
for the desired increment of movement.
work piece removed from the mandrel. The abra
In the modi?cation shown in Figure 5, there 50 sive comb may comprise a, series of toothed disks '
is shown a slightly different arrangement where
placed face to face or it may be an integral body.
in the work piece is moved axially relative to the
From the foregoing it will be seen that my in- ‘
cutter 0r threading comb, instead of the comb
vention provides a machine for threading green
being moved'with respect to the work piece. In
ceramic coil forms and the like very ‘accurately
this figure, 35 designates the bed of the machine
and very rapidly and with assurance that the
on which is a head-stock 36 and a tail-stock or
thread will be accurately formed over the desired
support 3'5. Mounted in the head-stock 56 is
portion of the periphery of the work piece.
a shaft 38 which may rotate and which is also
While I have illustrated and described cer~
movable longitudinally. It is provided at its outer
tain preferred embodiments of my invention/it
end with a handwheel 39. At the opposite end 60 will be understood that this is by way of. illus
there is a mandrel 40 for holding the work piece
tration and that various changes and modi?ca
A. The shaft 38 carries a collar 4| which con
tions may be made therein within "the contem
' stitutes an abutment for a spring 42, which spring
plation of my invention and under vthe‘scope‘ of
bears against the inner end face of the head
- stock 35, tending to urge the shaft 38 toward
the following claims.
I claim:
'
‘
>
i
i
"
the right as viewed in Figure 5. At the opposite
side of the head-stock the shaft 38 is provided
1. A threading tool of the class described com
prising a shaft having a mandrel thereon adapted
with a collar 43 having an inclined cam face All
to receive a work piece to be threaded,'a threading
comb having a series of teeth corresponding in
number and spacing to the number of threads to
‘thereon, the slope of which corresponds to the
pitch of’ the thread which is to be cut. The head
stock 35 is provided with a fixed pin 45 that
bears against'the cam surface 44.
be formed on the work piece and to the pitch of
such threads, a cam on the shaft having a cam
The support 31 is provided with a rotatable
surface equal to the pitch of one thread, means
shaft 45 having a hand lever 41 by means of
cooperating with the cam for imparting relative
which it may be turned through a limited arc. 75 axial movement between the work piece and the
5
2,409,993
comb equal to the pitch of a single thread, said
comb being also movable into and out of position
to engage a work piece on the mandrel, and manu
of a single thread, and means for moving the
comb out of work-engaging position.
'
5. A threading tool of the class described com
prising a shaft having a work-holding mandrel
thereon, means for turning the shaft, a cam on
the shaft having a helical face, a thread-forming
ally operable means for changing the relative po
sition between the cam and the work piece.
2. A threading tool of the class described com
prising a shaft having a mandrel thereon adapted
comb supported in work-engaging position along
to receive a work piece to be threaded, a thread
side the mandrel, said comb having a series of
ing comb having a series of teeth corresponding
thread-forming teeth thereon corresponding in
in number and spacing to the number of threads 10 number and spacing to the number of threads
to be formed on the work piece and to the pitch
to be formed on the work piece and to the pitch
of such threads, a cam on the shaft having a cam
of such threads, means on the comb engaging the
surface equal to the pitch of one thread, means
cam for moving the comb axially with reference
cooperating with the cam for imparting relative
to the mandrel when the shaft is rotated, the
axial movement between the work piece and the 15 helical face on the cam being equal to the pitch
comb equal to the pitch of a single thread, said
of a single thread, and spring means for yieldably
comb being also movable into and out of position
resisting the endwise movement of the comb un
' to engage a work piece on the mandrel, and
der the in?uence of said cam.
means for selectively changing the relation be
6. A threading tool of the class described com
tween the cam and the said cam-engaging means 20 prising a shaft having a Work-holding mandrel
whereby the thread formed on the work piece
thereon, means for turning the shaft, a cam on
may at the will of the operator be extended beyond
the shaft having a helical face, a thread-forming
that formed by a single turn of the mandrel.
comb supported in work-engaging position along
3. A threading tool of the class described com
side the mandrel, said comb having a series of ,
prising a shaft having a work-holding mandrel
thread-forming teeth thereon corresponding in
thereon, means for turning the shaft, a cam on
number and spacing to the number of threads
the shaft having a helical face, a thread-forming
to be formed on the work piece and to the pitch
comb supported in work-engaging position along
of such threads, means on the comb engaging the
side the mandrel, said comb having a series of
cam for moving the comb axially with reference
thread-forming teeth thereon corresponding in
to
the mandrel when the shaft is rotated, the
number and spacing to the number of threads to
helical face on the cam being equal to the pitch
be formed on the work piece and to the pitch of
of a single thread, and means for shifting the
such threads, and means on the comb engaging
relative position of said cam on said shaft.
the cam for moving the comb axially with refer
7. A threading tool of the class described com
ence to the mandrel when the shaft is rotated, ._
prising a shaft having a Work-holding mandrel
the helical face on the cam being equal to the
thereon, means for turning the shaft, a cam on
pitch of a single thread.
the
shaft having a helical face, a thread-forming
4. A threading tool of the class described com
comb supported in work-engaging position along
prising a shaft having a work-holding mandrel
thereon, means for turning the shaft, a cam on 40 side the mandrel, said comb having a series of
thread-forming teeth thereon corresponding in
the shaft having a helical face, a thread-forming
number
and spacing to the number of threads to
comb supported in work-engaging position along
be formed on the Work piece and to the pitch of
side the mandrel, said comb having a series of
such threads, means on the comb engaging the
thread-forming teeth thereon corresponding in
cam
for moving the comb axially with reference
number and spacing to the number of threads to 45
to the mandrel when the shaft is rotated, the
be formed on the work piece and to the pitch of
helical face on the cam being equal to the pitch
such threads, means on the comb engaging the
of a single thread, and means whereby the cam
cam for moving the comb axially with reference
may be moved endwise on the shaft after one
to the mandrel when the shaft is rotated, the
complete revolution to selectively extend the
helical face on the cam being equal to the pitch "
length of the thread being formed.
SEMON H. S'I'UPAKOFI'I‘.
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