Improvements in Screwing Dies for Lathes or other Machines.
Year: 1899

page_text: Date of Application, 8th Dec., 1899-Accepted, 27th Jan., 1900
0
COMPLETE SPECIFICATION.
Improvements in Screwing Dies for Lathes or other Machines.
I, FRANKLIN ALFRED ERRINGTON, residing at No. 15, Townsend Avenue,
Borough of Richmond, City of New York, State of New York, United States of
America, Mechanical Engineer, do hereby declare the nature of this invention,
nd in what manner the same is to be performed, to be particularly described and
scertained in and by the following statement: —
My improvements relate to thread cutting tools the dies of which are adapted
to have sufficient axial and lateral movement independently of their supporting
body to close and open by coaction with the work or article upon which they cut
threads, and the object of my invention is to provide a simple, practical and
efficient tool of the character described, wherein when the work is pressed against
the cutting dies, or vice versa, they will close to the operative position, and when
threads are cut upon the work and the axial movement of the work into the
body is arrested the continued rotation of the dies or of the work will cause the
dies to move outwardly axially of the supporting body during operation, cutting
their way along the work until the external thrust faces of the dies thus auto-
matically pass out of engagement with the internal thrust-faces of the supporting
body, whereupon said dies will automatically expand laterally of the supporting
body to permit the separation of the work and dies without stopping or changing
the direction of rotation of the rotative member; and the invention consists in
the novel details of improvement and the combinations of parts that will be more
fully hereinafter set forth and then pointed out in the claims.
Reference is to be had to the accompanying drawings forming part hereof,
wherein
Figure 1 is an end view of a device embodying my invention showing the parts
in the open position, affording clearance between the dies for the removal of the
work;
Figure 2 is a partly sectional view on the line 2, 2, in Figure 1, the dies being
shown in the closed or cutting position, half of the inner parts of the device
being shown in full lines;
Figure 3 is a similar view, the dies being shown in the inoperative or open
position;
Figure 4 is a vertical cross-section on the line 4-4 in Figure 2 looking in the
direction of the arrows; and
Figure 5 is a similar view taken on the same plane, but looking in the opposite
5 direction.
Similar numerals of reference indicate corresponding parts in the several views.
I indicates the supporting body of the device, shown provided with a shank 3
for connection with either the turret or live spindle of a lathe or similar machine
tool. Abutments 2 project from body 1 with openings 1 between them, which
The body 1 is preferably inter
afford ready egress for the escape of chips, etc.
nally tapered on the inner surfaces of its abutments 2 at 2b; and the said tapere
faces are shown indented by grooves 2ª, shown placed diametrically opposite an
extending parallel with the axis of body 1. I preferably provide body 1 wit

page_text: laterally adjustable internal thrust-faces by placing them on adjusting-blocks 4,
whose externally tapered surfaces abut against the internally tapered surfaces 2b
of abutments 2. To adjust the blocks 4 axially and laterally of body 1 and for
holding them axially rigid in the position adjusted, I have shown the lower
portion of each of the blocks 4 pierced by a T-slot 4ª, extending laterally of
body 1.
From each of said blocks 4 extends in a direction parallel with the axis
of body 1 an adjusting and holding member, shown in the form of a flanged
screw-threaded rod 1b, whose flange and shank correspond in section with said
T-slot 4. This slip-joint connection permits the part 1b to rotate in slot 4
independently of block 4 to adjust the block axially of body 1 in unison with
adjusting-screw 1b, the fit of the flange of said adjusting-screw being such as to
hold said block 4 rigidly in position axially of body 1 when adjusted, and yet
permit said block to slide along said flange laterally of body 1 independently of
the adjusting-screw 1b. The parts 1b when in the form of screws preferably mesh
with threaded bores shown in line therewith in body 1, and the lower ends of
said screws are preferably split at 1*, so as to have an outward spring tendency
to bind in place, and at the same time this slot 1* will serve to receive a right-
angle screw-driver or similar tool for operating the screw. As shown in
Figures 2 and 3, the flange of adjusting-screw 1 extends through block 4 into
the groove in its associate abutment 2 and by this means the part 1b is
brought about to the normal center of the adjusting-block 4, to maintain the
maximum bearing thereupon while said block 4 is moved laterally thereof during
its axial adjustment by the internally tapered surfaces 2b of abutments 2. A die-
holder 7 preferably surrounds the abutments 2 and is movable therealong axially
of body 1. To limit the inward axial movement of die-holder 7, I provide upon
blocks 4, lateral projections 4, which abut against the inner surface of die-
holder 7, said die-holder being utilized as an adjusting-ring by adjusting said
blocks 4 to bring their projections or lugs 4b to bear simultaneously upon said
inner surface of said die-holder. Aligning-pieces 7 project from the back of
said die-holder 7 along and overlap the body 1. The die-holder 7 is provided
with a die-chamber 7° whose side walls are preferably indented by internal slide-
ways 7. A pair of threading dies or chasers 8, are inserted through the enlarged
entrance 7 to said die-chamber, said dies being substantially rectangular in
cross-section and the ways 7d being of such dimensions that the dies are a sliding
fit therein. To enable the dies 8 to center themselves within reasonable limits
relatively to the axis of rigidly held work, the width of abutments 2 is such
relatively to the width of die-chamber 7° and its extensions along the over-lapping
portions 7d (similar allowance being made in fitting screws 1b to T-slots 4*)
that the die-holder 7 can have slight lateral movement upon said abut-
ments at right angles to the lateral movement of dies S along said die-holder
(see Figs. 1, 4 & 5). It being desirable to regulate the inward movement of the
dies 8 to keep them in contact with the adjusting blocks 4, and in position in die-
holder 7, I provide a spring 9, preferably located in a slot 7 cut laterally through
the die-holder at right angles to the axis of body 1, I preferably term said spring
a bow-spring, its ends 93 being bent in such a manner as to enter clearance
holes 8a provided in the dies, while its central bowed portion projects through
the slot 7. To retain the spring 9 in slot 7, I have shown said spring waved
or bent at an angle to said slot in the portion that normally projects beyond the
upper surface of die-holder 7 at 9b, and so arranged as to be compressible when
slipping through slot 7, and to expand when therebeyond. The pressure of
spring 9 also prevents accidental movement of blocks 4 laterally of body 1
independently of adjusting-screws 1b.
The main object of my invention being to cause the dies 8 to contract or
approach each other to the operative position and to expand or move away from
each other to the open or inoperative position to release the work without
reversing the direction of rotation of the driving member, I. provide means

page_text: ereby this opening and closing of the dies can be effected by and
vement axially of body 1. For this purpose I have provided the body 1 .with
ernal thrust faces (preferably formed upon blocks 4, rather than integral with
ly 1, as aforesaid). To shorten the travel of the dies 8 axially of body 1 in
sing from the operative to the open position, and vice versa, I provide each of
e dies 8 at its end opposite its cutting face with a plurality of external thrust-
ces 14, 15, the external thrust-face 14 being shown located further within the
dy 1 than its associate external thrust-face 15 and said associate external thrust-
ces are divided by a recess c; and I correspondingly divide the internal face of
by placing an internal thrust-face 10 further within the
ch of the blocks
dy 1 than an associate internal thrust-face 11, in such a manner as to sub-
vide the internal face of block 4 to provide an intervening space or recess a
receive the inner external thrust-face 14 of the associate die when the dies
re in the open position. I preferably term the face 10 of each of the blocks
he inner internal thrust-face and its associate face 11 the outer internal thrust-
ce, said associate thrust-faces being preferably shown located in line and parallel
with the axis of body 1 and separated from each other by the intervening recess a
which extends outwardly beyond its respective thrust-face 10; and I have pro-
ided a cam 13 leading from said recess a to its respective internal thrust-face 10.
I have also provided a cam-face 12 leading from the space or recess b (see Fig. 3)
that is beyond the outer internal thrust-face 11, said recess 6 corresponding in
Either or both of said cams may be used as desired.
function with the recess a.
Thus, the opposed internal thrust-faces 10, 11 and their associate cam faces 12, 13
and the recesses a, b, provide a die-chamber 7 between the blocks 4, having a
succession of inner and outer sections or portions of different diameters, the
outer portion a of said chamber beyond its respective set of internal thrust-
faces 10 and the outer portion b of said chamber beyond its respective set of
internal thrust-faces 11, each being of greater diameter than the respective inner
portions of said chamber between said internal thrust-faces. I preferably term
the face 14 of each of the dies 8 the inner external thrust-face and its associate
face 15 the outer external thrust-face said associate thrust-faces being preferably
shown located in line with each other and parallel with the axis of body 1 and
having a recess c between them. The recess c is preferably located centrally of
the die and extends thereacross at right angles to the axis of body 1, rendering
the thrust-faces 14, 15 equal and the die reversible to bring the inner end of its
cutting face outwards for presentation against the work when the outer end
The thrust-faces 14, 15 of the dies are adapted to bear
thereof has become worn.
upon the thrust-faces 10, 11 of the blocks 4 when the dies are in the operative
position, and the recesses e of the dies are adapted to receive the outer external
thrust-faces 11 of the blocks when said dies are in the expanded, or inoperative,
or work releasing position, the body recesses a of the blocks at the same time
receiving the inner external thrust-faces 14 of the dies, while the spaces or
beyond the blocks provide clearance for the outer external thrust-
faces 15 of the dies. The dies are also adapted to coact with the cams 12, 13,
5 when said dies are being pushed inwardly axially of body 1, said cams pushing
said dies inwardly laterally of body 1 during said inward axial movement until
the external thrust-faces of the dies pass beyond the plane of the internal thrust-
faces of the body (on blocks 4), whereupon the dies can be pushed further inward
axially of body 1 until the inner surface of die-holder 7 abuts against the lugs 4b
50 or blocks 4, which bring the external thrust-faces of the dies to register with the
internal thrust-faces of the body in full engagement, and the dies will be in the
operative position. The planes of the thrust-faces all being shown parallel with
the axis of body 1, the dies will retain an uniform cutting diameter when moving
axially of body 1 until such time as their external thrust-faces 14, 15, slip of
55 the internal thrust-faces 10, 11, whereupon the dies will expand outwardly laterally
of body 1. It will be understood that by adjusting the blocks 4 relatively t
each other laterally of body 1 (by means of internally tapered faces 2b an
recesses

page_text: adjusting-screws 1b) the diameter between the cutting faces of the dies when in
the operative position can be varied to cut the size required. It will be under-
stood that as the die-holder 7 moves axially of body 1, the dies will be carried
in the same direction with it, and that when moving axially of body 1 the thrust-
faces of the dies will either move into engagement with the thrust-faces of the
adjusting-blocks 4, or out of engagement therewith; also that when said external
thrust-faces of the dies move out of engagement with the internal thrust-faces of
the blocks the projections of the dies upon which their inner external thrust-
faces 14 are carried will mesh with the recesses a of the blocks in such a manner
as to prevent the escape of the die-holder from the abutment 2. Likewise that
to remove the dies, blocks 4 must be moved laterally of the body 1 until their
T-slots clear the flanges of screws 1, and to do this the spring 9 must be
sufficiently compressed and be free to rise above the surface of die-holder 7;
thereupon the blocks 4 are slipped out of the die-holder, and one of the dies 8 is
pushed into register with the central entrance portion 7 of the die-chamber 7,
thereupon the spring 9 slides along the slot 7 and pushes the other die 8 over
into the space left vacant by the removal of the abutment 2 and block 4 from that
side, and then the first mentioned die can be withdrawn through opening 7°,
and out of engagement with the end 9 of the spring. The other
die is then pushed over to the central spring 7, during which time
the spring 9 slides along the slot 7 in the opposite direction
permit the second die to be removed as before, the spring being retained in
its slot 7 by its waved or bent portion 9b. The dies are inserted at the central
opening 7 by their clearance holes 8ª receiving one end 9ª of spring 9, the die
then sliding along the ways 7d until the other end of the spring 9 can mesh
with the clearance hole of the other die, which is similarly inserted; then
the blocks 4 are inserted between the dies and the aligning pieces 7b, and then the
abutments 2 are inserted between the blocks and said aligning-pieces until the
blocks 4 can be pressed together and their T-slots brought to mesh again with
the flanges of the adjusting-s
-screws 1, when the parts resume their proper relative
positions under the influence of spring 9.
to
When it is desired to open the dies automatically by the inner end of the work
abutting against an internal part of the device, I provide the shank 3 with a
suitable bore to receive a stop 5, shown provided with tapped holes 5b to receive
a set-screw 5ª, which projects through an elongated slot 3 in shank 3, the head
of said screw 5ª bearing upon the outer surface of shank 3 to clamp stop 5
rigidly to body 1 when adjusted, said arrangement permitting said stop 5 to be
externally adjusted.
The operation of the device may be described as follows:-
The parts being in the position shown in Figure 3, with the die-holder 7 in
the outward or open position of the dies, a rod or piece of work to be threaded is
brought to bear against the outer face of one or both of the dies 8 or against the
die-holder 7 (or pressure by any other means being brought to bear against the
dies or die-holder), and pushes said die-holder axially along body 1, whereupon
the dies will ride up the cam or cams 12, 13 of the adjusting-blocks 4 towards
each other laterally of body 1, and said pressure being continued said die-holder
and dies will continue to move axially of body 1 until the die-holder comes to
rest against the projections or lugs 4 of blocks 4, whereupon the parts will be
in their operative position as illustrated in Figure 2, with the dies closed. The
threading of the work will now proceed until the advance of the work relatively
to body is stopped by some means, as by the inner end of the work abutting
against the adjustable stop 5. The work or the tool continuing to rotate after
the cessation of the relative axial movement of the work and body 1, the dies will
immediately start to cut their way outwardly axially of body 1, along the work 6,
whereupon the thrust-faces 14 15 of the dies will be drawn along the thrust-
faces 10, 11 of the blocks 4, but will continue to bear firmly upon the same during
said axial movement of the dies 8; holding the dies 8 in perfect alignment and

page_text: ameter of their cutting with relation to the axis of work 6, until the edges of
e thrust-faces 14, 15 of the dies slip off the outer edges of the thrust-faces 10, 11
the blocks 4, whereupon the dies 8 will expand laterally of the body 1 in
assing from the inner to the outer portions of the die-chamber 7, and the
ork 6 will be released from the dies 8.
my
said
Having now particularly described and ascertained the nature of
avention, and in what manner the same is to be performed, I declare that what
claim is:
1. The combination of a supporting body provided with internal thrust-faces,
plurality of independent dies connected with said body to rotate in unison
herewith and movable laterally thereof and provided at their ends opposite their
utting faces with external thrust-faces that bear against said internal thrust-
faces during operation, said dies being movable axially of said body during opera-
tion independently of said internal thrust-faces, and means to retain said dies in
alignment relatively to each other and to the axis of said body.
2. The combination with a supporting body provided with internal thrust-faces,
of a die-holder connected with said body to rotate in unison therewith and
movable axially thereof, and a plurality of independent dies movable along said
internal thrust-faces
die-holder laterally of said body and provided at their ends opposite their cutting
faces with external thrust-faces that bear against said
during operation, said dies being movable with said die-holder axially of said
body during operation independently of said internal thrust-faces.
3. The combination with a supporting body provided with internal thrust-
faces, of a die-holder connected with said body to rotate in unison therewith
and movable axially thereof, and a plurality of independent dies movable along
said die-holder laterally of said body and provided at their ends opposite their
cutting faces with external thrust-faces that bear against said internal thrust-
faces during operation, said dies being movable with said die-holder axially of
said body during operation independently of said internal thrust-faces, and means
to align said die-holder with the axis of said body.
4. The combination with a supporting body provided with internal thrust-
faces, of a plurality of independent dies connected with said body to rotate in
unison therewith and movable laterally thereof and provided at their ends opposite
their cutting faces with external thrust-faces that bear against said internal
thrust-faces during operation, said dies being movable axially of said body during
operation independently of said internal thrust-faces, and a die-holder movable
axially of said body and provided with a slideway that meshes with said dies to
connect said dies to move in unison with said die-holder axially of said body and
independently of each other along said die-holder laterally of said body.
5. The combination with a body provided with internal thrust-faces, of a
plurality of independent dies connected with said body to rotate in unison there-
with and movable laterally thereof and provided at their ends opposite their
cutting faces with external thrust-faces that bear against said internal thrust
faces during operation, said dies being movable axially of said body during opera-
tion independently of said internal thrust-faces, and means to regulate the inward
movement of said dies laterally of said body.
body provided with internal thrust-faces, of a die-
6. The combination with a
holder connected with said body to rotate in unison therewith and movable axially
thereof, and a plurality of independent dies movable along said die-holder laterally
0 of said body and provided at their ends opposite their cutting faces with external
thrust-faces that bear against said internal thrust-faces during operation, said
dies being movable with said die-holder axially of said body during operation
independently of said internal thrust-faces, said die-holder having a die-chamber
provided at its mid-portion with an enlarged entrance, said dies being adapted
55 to be inserted at said entrance and guided along the narrower side portions o

page_text: said chamber, and means to retain said dies in said narrower side portions of said
chamber.
"
7. The combination with a supporting body provided with internal thrust-
faces, of a die-holder connected with said body to rotate in unison therewith and
movable axially thereof, and a plurality of independent dies movable along said
die-holder laterally of said body and provided at their ends opposite their cutting
faces with external thrust-faces that bear against said internal thrust-faces during
operation, said dies being movable with said die-hokler axially of said body during
operation independently of said internal thrust-faces, and a cam or cams.
S. The combination with a supporting body provided with abutments having a
die-chamber between them whose end walls provide internal thrust-faces, of a
plurality of dies connected with said body to rotate in unison therewith and
movable laterally thereof and provided at their ends opposite their cutting faces
with external thrust-faces that bear against said internal thrust-faces during
operation, said dies being movable between said abutments axially of said chamber
during operation independently of said internal thrust-faces.
9. The combination with a supporting body provided with internal thrust-
faces, of dies connected with said body to rotate in unison therewith and movable
laterally thereof and provided at their ends opposite their cutting faces with
external thrust-faces that bear against said internal thrust-faces during operation,
said dies being movable axially of said body during operation independently of
said internal thrust-faces, and a stop rigidly carried by said body and normally
immovable relatively thereto to arrest the axial movement of work into said body
during the automatic outward movement of said dies axially of said body.
10. The combination with a supporting body provided with internal thrust-
faces, of dies connected with said body to rotate in unison therewith and movable
laterally thereof and provided at their ends opposite their cutting faces with
external thrust-faces that bear against said internal thrust-faces during operation,
said dies being movable axially of said body during operation independently of
said internal thrust-faces, a stop rigidly carried by said body and normally
immovable relatively thereto, and a cam or cams.
11. The combination with a body, of dies connected with said body to rotate in
unison therewith and movable laterally thereof, said body having an elongated
slot, and an adjustable stop having a projection secured thereto and extending
through and movable axially of said body in said slot to permit said stop to be
externally adjusted axially of said body, and means to retain said stop in position
when adjusted.
12. The combination with a supporting body provided with internal thrust-
faces and having a die-chamber therebetween, of a plurality of dies connected with
said body to rotate in unison therewith and movable laterally tuereof, and pro-
vided at their ends opposite their cutting faces with external thrust-faces that
bear against said internal thrust-faces during operation, said dies being movable
axially of said body during operation independently of said internal thrust-faces,
and an abutment rigidly carried by said body and projecting into said die-
chamber beyond the back-plate thereof to limit the inward movement of said dies
axially of said body.
13. The combination with a supporting body provided with internal thrust-
faces, of a plurality of dies connected with said body to rotate in unison therewith
and movable laterally thereof and provided at their ends opposite their cutting
faces with external thrust-faces that bear against said internal thrust-faces during
operation, said dies being movable axially of said body during operation, indepen-
dently of said internal thrust-faces. and an adjustable abutment rigidly carried
by said body to limit the inward movement of said dies axially of said body.
14. The combination with a body provided with inner and outer internal thrust-
faces located in line and having a recess between them, of a plurality of dies
connected with said body to rotate in unison therewith and movable laterally

page_text: reof, each of said dies being provided at its end oppu̟
er and outer external thrust-faces located in line and having a recess between
m extending centrally across the outer face of the die at right angles to the
s of said body to render the die reversible, said die thrust-faces being adapted
bear against said body thrust-faces during operation.
15. The combination with a supporting body provided with internal thrust-
ces, of a die-holder connected with said body to rotate in unison therewith and
vable axially thereof, and a plurality of dies movable along said die-holder
terally of said body and provided at their ends opposite their cutting faces with
ternal thrust-faces that bear against said internal thrust-faces during operation,
id dies being movable with said die-holder axially of said body during opera-
on independently of said internal thrust-faces, said die-holder also having
ovement laterally of said body to permit said dies to center themselves with the
xis of rigidly held work.
16. The combination with a body provided with a die-chamber having a succes-
ion of inner and outer sections located in line, each of said inner sections being
rovided with internal thrust-faces and being separated from its associate inner
ection by an outer section, of a plurality of dies connected with said body to
otate in unison therewith and movable laterally thereof, each of said dies being
provided at its end opposite its cutting face with a plurality of external thrust-
faces that are correspondingly separated from each other and bear simultaneously
of the dies
upon said internal thrust-faces during operation, and each of said outer sections
extending outwardly beyond the internal thrust-faces of its respective, inner
section to provide clearance for the respective external thrust-faces" of
when in the open position.
chaniber
Said
of
inner
17. The combination with a supporting body provided with a
having a succession of inner and outer sections located in line, each of sa
sections being provided with internal thrust-faces and being separated from it
associate inner section by an outer section, of a plurality of dies connected with
said body to rotate in unison therewith and movable laterally thereof, each of said
dies being provided at its end opposite its cutting face with a plurality
thrust-faces that are correspondingly separated from each other and bear
taneously upon said internal thrust-faces during operation, and
sections extending outwardly beyond the internal thrust-faces of its respective
inner section to provide clearance for the respective external thrust-faces of the
dies when in the open position, said dies being movable axially of said body
during operation independently of said internal thrust-faces.
st
external
18. The combination with a body provided with inner and outer internal thrust-
faces having a recess between them, of a plurality of dies connected with said
O body to rotate in unison therewith and movable laterally thereof, each of said
dies being provided at its end opposite its cutting face with inner and outer
external thrust-faces having a recess between them and being adapted to bear
simultaneously upon the corresponding body thrust-faces during operation.
f:
19. The combination with a body provided with inner and outer internal thrust-
45 faces having a recess between them, of a plurality of dies connected with said
body to rotate in unison therewith and movable laterally thereof, each of said, dies
being provided at its end opposite its cutting face with inner and outer external
thrust-faces having a recess between them and being adapted to bear, simul
taneously upon the corresponding body thrust-faces during operation, and a can
50 or cams.
20. The combination with a supporting body provided with inner and oute
internal thrust-faces having a recess between them, of a plurality of "dies con
nected with said body to rotate in unison therewith and movable laterally thereo
each of said dies being provided at its end opposite its cutting face with inne
55 and outer external thrust-faces having a recess between them and being adapte
to bear simultaneously upon the corresponding body thrust-faces during
11
oper

page_text: tion, said dies being movable axially of said body during operation independently
of said internal thrust-faces.
21. The combination with a supporting body provided with inner and outer
internal thrust-faces having a recess between them, of a plurality of dies con-
nected with said body to rotate in unison therewith and movable laterally thereof,
each of said dies being provided at its end opposite its cutting face with inner
and outer external thrust-faces having a recess between them and being adapted
to bear simultaneously upon the corresponding body thrust-faces during operation,
and a cam or cams, said dies being movable axially of said body during operation
independently of said internal thrust-faces.
22. The combination with a body provided with inner and outer internal thrust-
faces, of a plurality of dies connected with said body to rotate in unison there-
with and movable laterally thereof, each of said dies being provided at its end
opposite its cutting face with inner and outer external thrust-faces that bear
against said internal thrust-faces during operation, each of said inner internal
thrust-faces being located further within said body than its associate outer internal
thrust-face to provide a space to receive the inner external thrust-face of the
associate die when in the open position.
23. The combination with a supporting body provided with inner and outer
internal thrust-faces, of a plurality of dies connected with said body to rotate in
unison therewith and movable laterally thereof, each of said dies being provided
at its end opposite its cutting face with inner and outer external thrust-faces
that bear against said internal thrust-faces during operation, each of said inner
internal thrust-faces being located further within said body than its associate
outer internal thrust-face to provide a space to receive the inner external thrust-
face of the associate die when in the open position, said dies being movable
axially of said body during operation.
24 The combination with a body provided with inner and outer internal thrust-
faces, the planes of said thrust-faces being parallel with the.axis of said body, of a
plurality of dies connected with said body to rotate in unison therewith and
movable laterally thereof each of said dies being provided at its end opposite its
cutting face with inner and outer external thrust-faces that bear against said
internal thrust-faces during operation, each of said inner internal thrust-faces
being located further within said body that its associate outer internal thrust-face
to provide a space to receive the inner external thrust-face of the associate die
when in the open position.
25. The combination with a supporting body provided with inner and outer
internal thrust-faces, the planes of said thrust-faces being parallel with the axis
of said body, of a plurality of dies connected with said body to rotate in unison
therewith and movable laterally thereof, each of said dies being provided at its
end opposite its cutting face with inner and outer external thrust-faces that bear
against said internal thrust-faces during operation, each of said inner internal
thrust-faces being located further within said body that its associate outer
internal thrust-face to provide a space to receive the inner external thrust-face of
the associate die. when in the open position, said dies being. movable axially of
said body independently of said internal thrust-faces.
26. The combination with a body provided with inner and outer internal thrust-
faces located in line and having a recess between them, of a plurality of dies
connected with said body to rotate in unison therewith and movable laterally
thereof, each of said dies being provided at its end opposite its cutting face with
inner and outer external thrust-faces located in line and having a recess between
them, said die thrust-faces being adapted to bear against said body thrust-faces
during operation and said body recess to receive the inner external thrust-face
of the die while the recess of the die receives the outer internal thrust-face of
the body when said dies are in the open position.
27. The combination with a supporting body provided with inner and outer

page_text: nternal thrust-faces located in line and having a recess between
lurality of dies connected with said body to rotate in unison therewith and
aovable laterally thereof, each of said dies being provided at its end opposite
ts cutting face with inner and outer external thrust-faces located in line and
aving a recess between them, said die thrust-faces being adapted to bear against
aid body thrust-faces during operation, and said dies being movable axially of
aid body during operation independently of said internal thrust-faces.
28. The combination with a supporting body provided with inner and outer
nternal thrust-faces located in line and having a recess between them, of a
lurality of dies connected with said body to rotate in unison therewith and
novable laterally thereof, each of said dies being provided at its end opposite
ts cutting face with inner and outer external thrust-faces located in line and
having a recess between them, said die thrust-faces being adapted to bear against
said body thrust-faces during operation, and a cam or camis, said dies being
movable axially of said body during operation independently of said internal
thrust-faces.
29. The combination with a supporting body provided with internal thrust-
faces and means to adjust said thrust-faces relatively to each other laterally of
said body, of a plurality of dies connected with said body to rotate in unison
therewith and movable laterally thereof and provided at their ends opposite their
cutting faces with external thrust-faces that bear against said internal thrust-
faces during operation, said dies being movable axially of said body during
operation independently of said internal thrust-faces.
30. The combination with a supporting body provided with internal thrust-
faces and means to adjust the distance between said internal thrust-faces, of a
plurality of dies connected with said body to rotate in unison therewith and
movable laterally thereof and provided at their ends opposite their cutting faces
with external thrust-faces that bear against said internal thrust-faces during
operation, said dies being movable axially of said body during operation indepen-
dently of said internal thrust-faces, and means to move said dies laterally of
said body during the inward movement of said dies axially thereof.
31. The combination with a supporting body provided with internal thrust-
faces, of a plurality of dies connected with said body to rotate in unison therewith
and movable laterally thereof and provided at their ends opposite their cutting
faces with external thrust-faces that bear against said internal thrust-faces during
operation, said dies being movable axially of said body during operation
independently of said internal thrust-faces, a plurality of adjusting-blocks, and an
adjusting-ring movable along said body.
32. The combination with a supporting body provided with adjusting-blocks
having internal thrust-faces, means to adjust said blocks relatively to each other
laterally of said body, of a plurality of dies connected with said body to rotate in
unison therewith and movable laterally thereof and provided at their ends opposite
their cutting faces with external thrust-faces that bear against said internal
thrust-faces during operation, said dies being movable axially of said body during
5 operation independently of said internal thrust faces.
33. The combination with a supporting body provided with adjusting-blocks,
each of said adjusting-blocks having an internal thrust-face that is parallel with
the axis of said body and means to adjust said blocks relatively to each other
laterally of said body, of a die-holder connected with said body to rotate in
50 unison therewith and movable axially thereof, and a plurality of dies movable
along said die-holder laterally of said body and provided at their ends opposite
their cutting faces with external thrust-faces that bear against said interna
thrust-faces during operation, said dies being movable with said die-holder axially
of said body during operation independently of said internal thrust-faces.
55
34. The combination with a supporting body provided with adjusting-block
having internal thrust-faces, means to adjust said blocks relatively to each othe

page_text: laterally of said body and means to hold said blocks from movement axially
thereof, of a plurality of dies connected with said body to rotate in unison there-
with and movable laterally thereof and provided at their ends opposite their
cutting faces with external thrust-faces that bear against said internal thrust-
fa es uuring operation, said dies being movable axially of said body during opera-
tion independently of said internal thrust-faces.
35. The combination with an internally tapered supporting body provided with
externally tapered adjusting-blocks having internal thrust-faces, means to adjust
said blocks axially and laterally of said body and means to hold said blocks in
position when adjusted, of a plurality of dies connected with said body to rotate
in unison therewith and movable laterally thereof and provided at their ends
opposite their cutting faces with external thrust-faces that bear against said
internal thrust-faces during operation, said dies being movable axially of said
body during operation independently of said internal thrust-faces.
36. The combination with an internally tapered supporting body provided with
externally tapered adjusting-blocks having internal thrust-faces, said body being
provided with screws adapted to have engagement with said blocks to lock tliem
from movement axially of said body, of a plurality of dies connected with said
body to rotate in unison therewith and movable laterally thereof and provided
at their ends opposite their cutting faces with external thrust-faces that bear
against said internal thrust-faces during operation, said dies being movable axially
of said body during operation independently of said internal thrust-faces.
37. The combination with an internally tapered supporting body provided with
externally tapered adjusting-blocks adjustably connected therewith and having
internal thrust-faces, of a plurality of dies connected with said body to rotate in
unison therewith and movable laterally thereof and provided at their ends opposite
their cutting faces with external thrust-faces that bear against said internal
thrust-faces during operation, said dies being movable axially of said body during
operation independently of said internal thrust-faces.
38. The combination with a supporting body provided with adjusting blocks
having internal thrust-faces, of a die-holder connected with said body to rotate
in unison therewith and movable axially thereof, said die-holder and blocks having
abutting members to adjust said blocks relatively to each other laterally of said
body and a plurality of dies movable along said die-holder laterally of said body
and provided at their ends opposite their cutting faces with external thrust-faces
that bear against said internal thrust-faces during operation, said dies being
movable with said die-holder axially of said body during operation independently
of said internal thrust-faces.
39. The combination of a supporting body provided with adjusting-blocks
having internal thrust-faces, means to adjust said blocks axially and laterally of
said body and means to hold said blocks from movement axially of said body
while permitting them to have movement laterally thereof, with a plurality of dies
connected with said body to rotate in unison therewith and movable laterally
thereof and provided at their ends opposite their cutting faces with external
thrust-faces that bear against said internal thrust-faces during operation, said
dies being movable axially of said body during operation independently of said
internal thrust-faces.
40. The combination of a supporting body provided with adjusting-blocks
having internal thrust-faces, means to adjust said blocks relatively to cach other
laterally of said body and adjusting-screws adjustably connected with said body,
cach of said blocks having a slip-joint connection with its associate adjusting-screw
to move in unison therewith axially of the body and independently thereof laterally
of the body, with a plurality of dies connected with said body to rotate in unison
therewith and movable laterally thereof and provided at their ends opposite their
cutting faces with external thrust-faces that bear against said internal thrust-
faces during operation, said dies being movable axially of said body during opera-
tion independently of said internal thrust-faces.

page_text: 41. The combination of a body provided with internally tapered abutments,
ach of said abutments having its tapered face indented by a groove extending
herealong in a direction parallel with the axis of said body, adjusting-blocks
aving internal thrust-faces and provided with T-slots extending laterally of
said body, flanged screws adjustably carried by said body and having their flanges
in mesh with said T-slots and extending into said grooves, with a plurality of
dies connected with said body to rotate in unison therewith and movable laterally
thereof and provided at their ends opposite their cutting faces with external
thrust-faces that bear against said internal thrust-faces during operation, said
dies being movable axially of said body during operation independently of said
internal thrust-faces.
42. The combination with a body provided with internal thrust-faces, of a
plurality of independent dies connected with said body to rotate in unison there-
with and movable laterally thereof, and provided at their ends opposite their
cutting faces with external thrust-faces that bear against said internal thrust-
faces during operation, and a spring or springs to press said dies outwardly
laterally of said body.
43. The combination with a supporting body provided with internal thrust-
faces, of a die-holder connected with said body to rotate in unison therewith and
movable axially thereof, and a plurality of dies movable along said dic-holder
laterally of said body and provided at their ends opposite their cutting faces with
external thrust-faces that bear against said internal thrust-faces during operation,
said dies being movable with said die-holder axially of said body independently
of said internal thrust-faces, and a spring or springs to press said dies apart.
44. The combination with a supporting body provided with internal thrust-
faces, of a die-holder connected with said body to rotate in unison therewith and
movable axially thereof, and a plurality of dies movable along said die-holder
laterally of said body and provided at their ends opposite their cutting faces with
external thrust-faces that bear against said internal thrust-faces during operation,
said dies being movable with said die-holder axially of said body independently
of said internal thrust-faces, and a bow-spring having its ends adapted to press
said dies apart.
45. The combination with a supporting body provided with internal thrust-
faces, of a die-holder connected with said body to rotate in unison therewith and
5 movable axially thereof, and a plurality of dies movable along said die-holder
laterally of said body and provided at their ends opposite their cutting faces with
external thrust-faces that bear against said internal thrust-faces during operation,
said dies being movable with said die-holder axially of said body independently of
said internal thrust-faces, and a spring to press said dies apart, said die-holder
0 having a slot to guide said spring.
46. The combination with a supporting body provided with internal thrust-
faces, of a die-holder connected with said body to rotate in unison therewith and
movable axially thereof, and a plurality of dies movable along said die-holder
laterally of said body and provided at their ends opposite their cutting faces with
45 external thrust-faces that bear against said internal thrust-faces during operation,
said dies being movable with said die-holder axially of said body independently
of said internal thrust-faces, and a bow-spring having its ends adapted to press
said dies apart said die-holder having a slot extending laterally of said body to
guide said spring, and means to retain said spring in said slot.
50
47. The combination with a supporting body provided with internal thrust-
faces, of a die-holder connected with said body to rotate in unison therewith and
movable axially thereof, and a plurality of dies movable along said die-holder
laterally of said body and provided at their ends opposite their cutting faces with
external thrust-faces that bear against said internal thrust-faces during operation
55 said dies being movable with said die holder axially of said body independently of
said internal thrust-faces, and a bow-spring adapted to press said dies apart, said

page_text: die-holder having a slot extending laterally of said body, and said spring being
located in said slot and retained therein by being bent transversely thereto.
Dated this 8th day of December 1899.
ALLISON BROS.,
Agents for the Applicant.