Improvements in Pipe-threading Machines.
Year: 1892

page_text: COMPLETE SPECIFICATION.
Improvements in Pipe-threading Machines.
A communication by JEAN BAPTISTE ZOTIQUE DUMAIS, of No. 812, North
Lincoln Street, Chicago, in the County of Cook and State of Illinois, United
States of America, Manufacturer.
I, WILLIAM PHILLIPS THOMPSON, F.C.S., M.I.M.E. of the Agency for
Foreign Patent Solicitors, 6 Lord Street, Liverpool & 6 Bank Street, Manchester,
both in the County of Lancaster, & 323 High Holborn, in the County of
Middlesex, Civil Engineer, do hereby declare the nature of this invention and in
what manner the same is to be performed, to be particularly described and ascer-
tained in and by the following statement:―
This invention relates to pipe threading machines and has for its object the
construction of a machine for that purpose, whereby the pipe which it is desired to
thread may be threaded by a continuous and rapid movement of a screw-threading
die, on the circumference of the pipe, and the improvement consists in the con-
struction of a cage or frame adapted to hold the die, and in suitable devices or
methods whereby the cage or frame may be rotated with the die about a stationary
pipe to be threaded; and the invention consists in various other devices and
improvements as hereinafter described.
Heretofore pipes have been threaded by a die fixed in the centre of a two-armed
lever operated by hand, and the work was accomplished in a slow and laborious
manner.
By the improved machine, the screw-threading die may be operated by any
applied power and the work is rapidly and satisfactorily accomplished. All the
parts are preferably of iron or steel.
In the drawings-
Figure 1 represents a plan view of a pipe threading machine embodying the
invention.
Figure 2 is a vertical longitudinal section, taken on the line 2-2, of Figure 1.
Figure 3 is a detail cross-section, showing the die and the frame holding the die,
taken on the line 3-3, of Figure 1.
Figure 4 is a detail cross-section of the die-holder, detached, with the die removed
from the same, taken on the line 4-4, of Figure 1.
Figure 5 is a vertical longitudinal section, showing a modified form of the
improved pipe threading machine.
A represents the bed of the machine, which may be secured to any suitable
support; B represents the worm which actuates the gear C with which it meshes.
The worm B is mounted in boxes b b in the bed of the machine. On one end of
the shaft of the worm is mounted a small gear-wheel D, adapted to mesh with and
be operated by the gear-wheel E, which is mounted on the shaft F, which has its
bearings in boxes ff in the bed of the machine. The shaft F is actuated by a
pulley G, which may be driven by any suitable power; whenever it is desired to
operate the machine by hand, a suitable crank and handle may be attached to the
stud-pin H in the circumference of the gear-wheel E. The gear-wheel C is
mounted on a journal C', having its bearing in boxes c c, secured in the frame of
the machine; extending longitudinally through the centre of the journal C¹ is a
circular hole, in which the spindle I fits loosely. This spindle projects outwardly
a sufficient distance to have formed on it a knob I' by which the spindle may be
turned, as hereinafter described.
K is a metal plate having on its inner end at its centre a recess k, through which
passes a screw L, which is screwed into the opening i formed in the inner end of

page_text: the spindle I, as shown in Figure 2, the opening i being screw-threaded, so as to
allow the screw L to be screwed into it by means of which the plate K and spindle I
are removably secured to each other for the purposes hereinafter set forth.
M is a die, rectangular or square in form, having in its centre a screw-threaded
opening N, which may be of any size, so as to fit pipes of different diameters.
This screw-threaded opening N may be entirely screw-threaded or it may have four
or more cutting edges, with the remaining portions cut away as shown at min
Figure 3, for the purpose of allowing the iron filings to fall away from the die.
These dies are adapted to be screwed onto the pipe to be threaded, as hereinafter
described. represents a pipe to be threaded, which is rigidly secured at or near
one end, while the other end is being operated upon. This pipe may be secured
by clamping vise S, as shown in Figure 1, or by any device for holding or clamping
such pipes.
:
P is a cage rectangular or square, as shown in Figure 4, constructed, preferably,
with openings in its sides for the purpose of allowing the chips from the pipe to fall
out of it. This cage P is open at one end, so that the plate K and the die M may
be placed therein, both of these parts being shaped to conform to the interior of the
cage. The plate K is pushed in to the further or-closed end of the cage, where it
is secured to the inner end of the spindle I, as already stated and as seen in Figure 2
of the drawings. The die M is placed in the cage after the plate K and is pushed
in nearly or quite to the latter the die M is loose within the cage, so that it is free
to move back and forth. When the parts are thus arranged and the pipe O is fixed
with one end extending into the cage for threading, as seen in Figure 2, the die M
will not always engage at first with the pipe without some assistance. The plate K
is for this purpose, for, being fastened upon the end of the spindle I, which has some
reciprocating motion, this plate may be pushed outward against the die M and so
cause it to engage with the end of the pipe, after which it will, of course, travel
along the cage towards the open end thereof, as the thread is formed. The inner
or closed end of the cage is removably secured to the journal C¹ of the gear-wheel C,
by set-screws, d, as shown in Figure 1. The cage P with the dic M in it revolves
about the pipe to be threaded, the die M moving in the cage toward the open end
of the cage, as the pipe O is being threaded by the die M.
In Figure 5 is represented a modification of the pipe threading machine, in which
the cage or holder not only revolves with the die, but also slides horizontally with
the die, so that both the die and holder revolve and slide horizontally together,
instead of the die moving horizontally, as hereinbefore described. In this modifi-
cation, R, is a die-holder, or cage; S₁ is a tube extending from the rear of the
machine through the dic-holder R. To the tube S¹ is secured the hand-wheel S²
by which the tube is operated. The opening in the tube S' is of sufficient size to
admit of the pipe to be threaded passing through it, so that as much of the pipe can
be threaded, as desired. The tube S' is screw-threaded on the outside of its outer
end and the cage R is screw-threaded on its inside at its outer end, so that the
tube S can be screwed into the cage, for the purpose of pressing the die onto the
pipe to be threaded and held on the pipe until the threading commences after
which the die M will feed itself, and such pressure is unnecessary.
The cage R is cylindrical at its longer and outer end, as shown in Figure 5,
and has a circular opening ; extending horizontally through its centre, fitted to
receive the tube S' which is a little longer than the opening r, so that the tube
may be screwed through this part of the cage and against the die M as before
stated.
The cage R at its inner end is enlarged and has formed within it a square
chamber shown in Figure 5. The shoulders 2, against which the die M
bears, are formed by this enlargement of the cage R. T is a bearing which
supports the cage K and in which it both revolves and has also at the same time
a horizontal sliding movement, as hereinafter stated. The bearing T is rigidly
secured to the post T on the main or supporting frame of the machine. The
cage R is prevented from any rearward movement beyond its bearing by a

page_text: shoulder formed on the outside of the chamber r, which strikes .the end of
the bearing T, as shown in Figure 5.
This device is actuated by substantially the same means, as hereinbefore
described. The bevel wheel T', shown in Figure 5, shows a handlet for
reversing the motion and withdrawing the die-holder and die from contact with
the pipe. The wheel T' is mounted on the bearing T, which is reduced in size
at its outer end, forming a shoulder t for that purpose, as shown in Figure 5.
U is a tongue secured to and forming part of the wheel T. The tongue U
fits into a groove u in the cage R and locks the wheel to the cage, so that both
the cage and the wheel revolve together. V is a vise for holding the pipe
which is to be threaded. This vise is composed of two slotted standards V,
suitably secured to the bed, and are connected at the top by a cross-piece;
these standards are exactly alike. Between these standards are jaws V and V³,
adjustably secured to the standards, so as to slide vertically between them; the
jaws are in usual form and need not be described. The upper jaw is operated
by a screw W, which is inserted in a socket w in the upper end of the jaw V*
and is held in said socket in any well known manner, so that it will turn in it.
The screw W passes through the top which connects the two standards. W. is
a cap on the top of the vise, having a socket w¹ screw threaded in the side
through which the screw W passes. The screw W is operated by an ordinary
hand lever. Passing through each end of the cap piece Ware screw bolts w³,
which extend through the slots in the standards and through the jaws V³ in
which they are secured by nuts won the lower end of the screw bolt. The
socket is screw threaded, so that, when the screw W is turned in one
direction, the jaw V will be raised and the cap-piece W will be screwed down,
thus lowering the jaw V³ and separating the jaws, so that the pipe can bo
removed. When the pipe is placed between the jaws, the reverse will take
place by turning the screw W in the opposite direction when the jaw V2 will be
screwed down and at the same time the jaw V³ will rise and the pipe to be
threaded will be secured between the two jaws.
X is a ring surrounding the bearing T. The inner end of this ring is inserted
in a groove in the wheel T formed therein for that purpose. The ring X is
fastened to the bearing T by screws which are screwed through the ring and
into the bearing T, as shown in Figure 5. After the pipe has been secured in
the vise and the tube S has pressed the die M onto the pipe to be threaded,
as hereinbefore described, the wheel T is revolved and with it the cage R and
die M; the process of threading the pipe carries forward the cage R which
slides in its bearing T, the groove u allowing the cage to move as the wheel is
turned.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, as communicated to mo
by my foreign correspondent, I declare that what I claim is:-
1. In a pipe threading machine, a revoluble cage or die-holder much longer
than the thickness of the die and open at one end, in combination with a
threading die set loosely in said holder and free to slide back and forth therein
lengthwise of the holder, and a pipe support in which the pipe to be threaded
is rigidly secured, whereby the die is turned upon the end of the pipe by the
revolution of the holder and at the same time is automatically fed by moving
forward bodily in the cage as the thread is cut on the pipe, substantially as
described.
2. In a pipe threading machine, the cage P, in combination with the die M,
plate K, and spindle 1, substantially as described.
3. The spindle I, having a knob or handle I', and the plate K, in combination
with the die M, substantially as shown and described.
4. In a pipe threading machine, the worm B, gear-wheel C, journal C¹ and

page_text: cage P rigidly secured to said journal, in combination with the die M and plate K,
substantially as described.
5. In a pipe threading machine, the pulley G, shaft F, gears E and D, worm B,
gear-wheel Ċ and journal C¹, in combination with the cage P, plate K, spindle Í
and die M, substantially as described.
6. The stud-pin H, gears E and D, worm B, gear-wheel C, journal C', and
cage P, rigidly secured to said journal, in combination with the plate K, spindle I,
knob I', and die M, substantially as shown and described.
7. In a pipe threading machine, a revoluble cage or die-holder, having an opening
through its centre to allow the pipe to be threaded to pass through it, said opening
being circular at the outer and longer end of said holder and square or rectangular
at its inner ends, said holder being also enlarged at its inner end, a threading die set
in the square or rectangular opening in the inner end of said holder and revolving
with it, a bearing rigidly secured to a post in the frame of the machine, said bearing
so constructed as to allow said die-holder to revolve within it and at the same time
to slide in said bearing with suitable power for operating said die-holder, in com-
bination with the pipe-support in which the pipe to be threaded is rigidly secured,
so that the die is fed automatically and moves forward with the holder sliding in
said bearing, substantially as described.
8. In a pipe threading machine, the vise V in which the pipe to be threaded is
rigidly secured, said vise being composed of slotted standards V1 connected by a
cross-piece on the top and having jaws V and V³, the upper jaw V³ having a
socket, the cap W₁ with socket w screw-threaded internally and having screw-
bolts passing through the ends of said cap and secured to the lower jaw
and the actuating screw W, passing through cap W and the top of the
standards V and secured to the upper jaw V2, but turning in its socket w.
the socket w and the screw W being so threaded that when the screw W
is turned in one direction the jaws will move toward each other and when turned
in the opposite direction the jaws will recede from each other, substantially as
described.
Dated this 27th day of June 1892.
WM. P. THOMPSON & Co.,
Agents for the Applicant.