Year: 1894

page_text: Date of Application, 15th Mar., 1894-Accepted, 21st Apr., 1894
Figure 4, a rear elevation.
Figure 5, a sectional elevation of a modified form of our machine.
Figure 6, a rear elevation of our improved machine with a modified form of vice
jaws, and
Figure 7, a detail perspective of the vice jaws shown at Figure 6.
Similar numbers of reference denote like parts in the several figures of the
drawings.
Our improvement is identified with that class of pipe threading machines in
which a rotatory die carrying ring is supported and journalled within a surrounding
casing, the principal feature being that our machine has no axial shaft, and
therefore possesses the advantages of a machine wherein the resistance of the
nction of the threading dies is taken up in radial lines by the surrounding
casing.
1 is the casing preferably of cast iron, 2 the die carrying ring journalled
circumferentially within said casing and having spur teeth on its periphery, 3 is a
pinion journalled in the casing and engaging with the teeth on the ring whereby
the latter may be revolved, 4 is a hollow lead screw extending rearwardly from
said ring, and 5 are the vice jaws capable of sliding in suitable bearings in the rear
of the casing.
6 is the operating screw for the vice jaws having right and left handed threaded
portions which take within said jaws. Extending from the casing is a ledge 7
and through the latter the screw 6 passes freely.
8, 9, and 10, 11, are sets of nuts and jam-nuts on the screw above and below
the ledge. By easing on one set of nuts and tightening the other set against the
ledge the screw is raised or lowered as the case may be in order to properly center
the jaws. When the upper face of the ledge or the lower face of the nut 8
become worn by constant use, the plane in which the jaws operate is lowered
accordingly so that the pipe cannot be clamped concentric with the threading dies.
To compensate for such wear the sets of nuts 8, 9, are tightened from time to
time, and, if necessary a new set of nuts may be substituted for those that are
worn. This idea of adjusting the screw bodily to a given horizontal plane is an
improvement of considerable value, for it saves a good deal of expense hitherto
necessary for repairs, and it insures true results.
We have ascertained that the best results are attained by forming long bearings
for the jaws at the sides through which the screw 6 extends and shorter bearings
at the other sides of said jaws, in that the thrust against the side ways in which

page_text: said jaws move is about equalized while at the same time the manipulation of the
screw 6 is facilitated owing to the absence of leverage against it.
In Figures 6 and 7 we have shown a construction and arrangement of the vice
jaws whereby the cutting or wearing out of the ways for the jaws are avoided,
and also the friction on the screw is to a great extent lessened.
Referring to these Figures 6 and 7, it will be observed that one of the jaws is
single while the other is double to allow for the passage of part of one jaw past
the other in grasping very small rods. Depending from the upper or single jaw
is an extension 13 which passes between twin extensions 14 which project upwardly
from the lower jaw.
any
15 are the threading dies which are secured within the ring 2 in suitable
and ordinary manner, and the office of the pipe vice is to hold the object to be
threaded in axial relation with the threading dies so that the thread will be cut
true.
In the operation of machines of this description we prefer to employ screw
devices for feeding the die carrying ring up to the object to be threaded, which
devices we will now describe.
16 are hubs which are formed on the casing on opposite sides thereof, said hubs
having therein pockets 17 which open within the casing. Within these pockets are
what we term "lead blocks" 18 capable of a free sliding movement and having
threads on their inner extremities which correspond with the thread on the lead
screw 4, to which blocks thumb screws 19, passed through the hubs 16, are swivelled
whereby, by the operation of said thumb screws, said blocks may be thrown into
and out of engagement with the lead screw 4.
-
The engagement of the lead blocks with the lead screw will of course cause the
ring when revolved to travel inwardly or outwardly as the case may be, thereby
carrying the threading dies toward or away from the object to be threaded.
In the use of machines of this description, the pipe or bolt to be threaded
frequently comprises a body portion of large diameter and a reduced end portion,
upon which latter the thread is to be cut. Also the machine must be capable of
cutting threads upon a nipple, one end of which latter has been previously threaded
and is contained within an ordinary nipple holder necessarily of a much greater
diameter than the nipple itself.
Furthermore, it is necessary that the vice should grasp the object to be threaded
as close up as possible to the portion on which the thread is to be cut, in order to
hold the same steady and to prevent any shake or vibration which would otherwise
occur if any considerable length of the pipe or bolt projected beyond the vice.
By housing the lead blocks within pockets such as shown, we are enabled to use
a lead screw of a diameter nearly as great as that of the ring itself, and this will
permit the latter to enclose in its sliding movements the vice jaws even when the
latter are distended to grasp a very large bolt or pipe, thus enabling our improved
machine to be utilized in instances where a lead screw of smaller diameter would
fail, in that it would abut against the vice jaws and could not enclose them.
In the cutting of threads upon pipes or bolts especially in the large sizes there is
a great resistance opposed to the action of the threading dies and in time this will
cause a slight wearing of the circumferential bearing in the casing which journals
the die carrying ring.
W e, have, however, provided for this by forming a slot 20 through the casing
from front to rear, lugs 21 being provided on opposite sides of the slot, and a
screw bolt 22 passing through said lugs.
These lugs are cast with the casing, the slot being formed by coring. By
turning the bolt said lugs may be drawn together sufficiently to take up any lost
motion between the die carrying ring and casing and to afford a snug bearing
for said ring.
While the yielding of the casing to the action of the bolt and nut is not
appreciable to the eye, it nevertheless is ample to compensate for the wearing
hereinbefore mentioned.

page_text: It very frequently happens that threads of a different nature and of different
pitch are to be cut, and in this instance, by threading the lead screw 4 interiorly
and exteriorly, and by providing the lead blocks with interiorly threaded jaws
which extend respectively inside and outside the lead screw, as shown at
Figure 3, (the threads on said jaws and lead screw being of different pitch) said
blocks may be engaged with the inside or the outside of the lead screw, as may
be desired, thus enabling threads of two different pitches to be cut by the same
machine.
In all instances when it is desired to cut off a section of a pipe or bolt, a
cutting tool is substituted in the ring in the place of the threading dies, and
the lead blocks disengaged from the lead screw, so that the ring may simply
revolve and have no longitudinal movement.
The casing, in all instances is cut away immediately below the pinion and the
longitudinal field of travel of the ring 2, to form a gate, as seen at 23, in order
that as the chips are cut away they may drop down out of the casing and not
clog the ring or pinion. This affords a very simple and effective way of getting
rid of the chips and the cutting of said opening does not materially weaken the
casing or take away support from the die carrying ring.
In some instances the lead screw and lead blocks may be dispensed with, and
other means be employed for the purpose of forcing the die carrying ring so as
to carry the threading dies up to the object to be threaded, and at Figure 5 we
have shown our machine adapted for use without such screw and blocks.
Referring to this Figure 5, 24 is a finger extending through the rim of the
casing from front to rear and capable of a free sliding movement.
The forward
end of this finger extends over the edge of the ring 2, while the casing in the
immediate rear of said end is recessed, as seen at 25, so that when the finger
is moved inward said forward end will bear against the ring and force the same
rearward. The rear end of this finger is perforated as seen at 26, and the nose 27
of the dog 28 projects within said perforation. This dog is pivoted between
ears 29 which are cast with the casing, and by depressing the tail 30 of the dog,
said nose will operate to draw the forward end of the finger inward against the
die carrying ring, whereby the latter is forced rearward to carry the dies into
operative position against the object to be threaded.
There are of course many changes which may be made in the details of con-
struction and arrangement herein before set forth, all of which changes are within
the scope of ordinary mechanical skill and genius, and we do not therefore wish
to be limited to the exact manner shown and described of making and equipping
our improvement.
Having now particularly described and ascertained the nature of our said
invention, and in what manner the same is to be performed, we declare that
what we claim is :-
1. In a pipe threading machine wherein the pipe vice jaws are suspended upon
the threads of the operating screw, the combination of the screw and the support
whereby said screw is suspended in a vertical position and is held as against any
movement except rotation, of means for adjusting said support to a given hori-
zontal plane and whereby the vice jaws may clamp the pipe concentric with the
threading dies, substantially as set forth.
2. The combination of the ledge extending from the casing, the operating
screw passed loosely through this ledge, the vice jaws suspended on the threads
of said screw, and the sets of nuts and lock nuts on said screw above and below
said ledge whereby the screw may be adjusted to a given plane, substantially as
set forth.
3. In a pipe threading machine, the pipe clamping jaws having bearings within
the casing, the front bearing being longer than the rear bearing, the heel ends
of said jaws having elongated bearings, in combination with the operating screw
housed within said elongated bearings, substantially as set forth.

page_text: •
4. In a pipe threading machine, the clamping jaws adapted to slide within
suitable guideways, one of said jaws having an extension on one side, and devices
for closing the jaws at the opposite side, substantially as described.
5. In a pipe threading machine, the clamping jaws one of which has an extension
depending therefrom, while the other is provided with twin extensions projecting
upwardly and between which the depending extension is guided, substantially as
set forth.
6. In a pipe threading machine, the combination with the exteriorly and
interiorly threaded lead screw, of the lead block having threaded jaws which
straddle said screw, and means for operating said block to throw said jaws
alternately into engagement with the interior and exterior threads on said screw,
substantially as set forth.
7. The combination of the lead screw having interior and exterior threads of
different pitch, the lead block, the screw operatively connected to said block, and
the jaws extending from said block within and without said ring, said jaws being
threaded to correspond with the interior and exterior threads on the lead screw,
substantially as and for the purposes set forth.
8. In a pipe threading machine, comprising a casing and a die carrying ring
supported by and revolving within said casing, the herein described means for
discharging the chips cut by the dies, consisting of a gate or opening cut within the
bottom of the casing and extending beneath the longitudinal field of travel of said
ring, substantially as set forth.
9. In a pipe threading machine having a rotatory die carrying ring capable of a
free sliding movement within a casing, the finger guided and supported within said
casing and having one end bearing transversely across the face of the ring and
capable of being moved longitudinally, whereby said ring is driven inward within
the casing to carry the threading dies up to the object to be threaded, substantially
as set forth.
10. In a pipe threading machine having a rotary die carrying ring capable of a
free sliding movement within a casing, the finger having a bearing transversely
through the rim of said casing, the front end of said finger being extended over the
edge of the die carrying ring, while the rear end is perforated, in combination with
the dog pivoted to said casing and having its nose projected within said perforation,
substantially as set forth.
11. In a pipe threading machine, the combination of the easing, the die carrying
ring having a free sliding movement therein, the finger extended through the rim
of the casing and having a bearing against said ring, and means as a pivoted dog,
connected with the rear of said finger, for forcing the latter inward against the ring,
substantially as shown and described.
12. The combination of the casing, the die carrying ring adapted to slide
therein, the finger adapted to slide within the rim of said casing and projecting at
its front end over the edge of said ring and provided at its rear end with a
perforation, the recess formed in the front edge of the casing for the accommodation
of the finger; the ears cast on the casing, and the dog pivoted between said ears
and having a nose extending within the perforation in the finger, substantially as
- set forth.
13. In a pipe threading machine employing a rotatory die carrying ring
journalled circumferentially within a surrounding casing and having a hollow lead
screw projecting rearwardly from said ring, the casing having hubs extending
laterally therefrom on opposite sides and in the rear of the die carrying ring, said
hubs provided with pockets which open into the casing, the lead blocks contained
within said pockets and capable of a free sliding movement, and means for operating
said blocks to throw them into and out of engagement with the lead screw, substan-
tially as set forth.
14. In a pipe threading machine comprising a rotatory die carrying ring
journalled circumferentially within a surrounding casing, the casing having one or
more slots extending therethrough from front to rear and provided with lugs on

page_text: opposite sides of said slot or slots, and means for drawing said lugs toward each
other whereby a snug bearing is afforded for the die carrying ring, substantially as
set forth.
15. In a pipe threading machine comprising a rotatory die carrying ring
journalled circumferentially within a surrounding casing, the casing capable of
being contracted whereby a snug bearing is afforded for the die carrying ring and
all wear compensated for, substantially as set forth.
16. In a pipe threading machine comprising a rotatory die carrying ring
journalled circumferentially within a surrounding casing, the casing having
extending therethrough from front to rear a slot and provided with lugs on
opposite sides of said slot and a screw bolt passed through such lugs for drawing
the latter together whereby a snug bearing is afforded for the die carrying ring,
substantially as set forth.
17. In a pipe threading machine, the vice jaws having their grasping surfaces.
extended within the casing of the machine, substantially as set forth.
18. In a pipe threading machine, comprising a rotatory die carrying ring
journalled within a surrounding casing and having a hollow lead screw extending
rearwardly and capable of engagement with suitable lead blocks, the vice jaws
having their clamping surfaces extended within said screw, substantially as set
forth.
19. In a pipe threading machine comprising a rotatory die carrying ring
journalled circumferentially within a surrounding casing and capable of a length-
wise movement therein, and means for holding the object to be threaded, the
combination with said ring of means for driving the same inwardly whereby the
threading dies are advanced toward the object to be threaded, substantially as set
forth.
20. In a pipe threading machine comprising a rotatory die carrying ring
journalled circumferentially within a surrounding casing, and a vice for holding the
object to be threaded, the combination with said ring of a finger, lever or
equivalent device readily detachable from the machine and capable of being
operated to press against the face of the ring whereby the latter may be driven
inwardly to carry the threading dies into engagement with the object to be threaded,.
substantially as set forth.
Dated this 15th day of March 1904
JENSEN & SON,
77, Chancery Lane, London, W.C., Patent Agents.