Improvements in and relating to Machines for Threading and Cutting off Pipes.
Year: 1898

page_text: Date of Application, 8th Mar., 1898--Accepted, 7th May, 1898
COMPLETE SPECIFICATION.
Improvements in and relating to Machines for Threading and Cutting
off Pipes.
We, RODERICK PERRY CURTIS and LEWIS BEERS CURTIS, Citizens of the United
States of America, both residing at the corner of Railroad Avenue and Garden
Street, in the City of Bridgeport, County of Fairfield and State of Connecticut,
United States of America, Manufacturers, do hereby declare the nature of this
invention, and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement:
Our invention has reference to machines for threading and cutting off pipe, and
will be best understood from the description which forms a part thereof taken in
connection with the accompanying drawings, in which
Figure 1 is a front elevation,
-
Figure 2 a detail broken sectional elevation showing our cut-off tool and the
feeding appliances therefor
-
Figure 3 a detail broken elevation showing the manner of equipping our machine
with means for thrusting the die carrying ring inwardly within the casing, and
Figures 4 and 5 are horizontal sections showing independent means for revolv-
ing the die carrying ring, as well as the arrangement of the vise to slide toward
the ring.
Our improved machine comprises a casing 1, within which a die carrying ring 2
is journaled circumferentially without any axial support. The casing has feet 3
whereby it may be attached to any suitable bench, and between these feet the
casing is divided as seen at 4, and bolts 5 are provided in connection with ordinary
nuts whereby this split or divided casing may be contracted more or less, so as to
compensate for any wear between said ring and the casing, thereby causing this
ring to run true. Of course this casing may be split in this manner at any con-
venient point, but, especially where machines are to be repaired, it is advantageous
and preferable to split the casing between the feet, as above set forth.
The ring 2 has spur gear teeth on its periphery which are engaged by a pinion 6
journaled in the frame so that when the pinion is revolved the ring is likewise
revolved. During the operation of cutting threads the die carrying ring may be
caused to advance within the casing, in which instance the pinion would be
elongated, or such ring may be stationary except as to rotary movement, or the
vise which clamps the pipe may be capable of a sliding movement toward the
threading dies. If the ring is arranged to slide, it may be equipped with a lead
screw which is engaged with one or more lead blocks that are supported within
the casing, or lead screw devices may be dispensed with and the ring may be
pushed bodily with an even pressure within the casing until the threading dies
engage with the object to be threaded.
We have provided for this purpose a yoke lever 7 which is pivoted at the sides
of the casing and is loosely connected at its extremities with the rear ends of
horizontally sliding bars 8 that are supported and guided within suitable boxes 9
at the sides of the casing. These bars have fingers 10 at their forward extremities

page_text: which extend across the face of the ring, so that when the lever is swung forward
the bars will be retracted and the fingers will bear against the face of the ring at
diametrically opposite points, and will force the latter inward within the casing
with an even pressure, the casing of course being cut away in order to permit the
fingers to have free movement.
In case the ring is stationary as to sliding movement, we provide a vise 11,
which may be arranged to slide and be guided upon dowels 12 which are extended
from the casing, as shown at Figure 4, and any suitable means may be employed
to actuate the vise to effect its sliding movements. Or the vise may be adapted
to slide within suitable ways 13 in the base of the frame of the machine, as shown
at Figure 5.
In the practical application of portable pipe threading machines, it frequently
happens that the pipe extends beyond the face of the machine, and it is therefore
extremely difficult to thread the pipe or cut off the same by means of a crank or
léver attached to the shaft of the pinion 6, for the reason that such lever or crank
would be interfered with in its rotary movement by the pipe itself. This is a
serious matter in the threading of small sizes of pipe as well as the cutting off of
any pipe, and we have therefore provided a separate means for revolving the die
carrying ring, which we will now describe.
When the ring is revolved by the elongated pinion so that such ring is capable
of sliding along the pinion, as hereinbefore set forth, we provide a bevel gear 14
on the rear extremity of the pinion shaft with which gear meshes a bevel
gear 15 journaled in the rear part of the frame of the machine, so that it will be
clear that the pinion and the die carrying ring may be revolved by means of a
crank attached to the shaft of the gear 15 without any interference whatever with
the pipe to be threaded or cut off.
It is immaterial whether the bevel gear that meshes with the gear 15 is on the
pinion shaft, as shown at Figure 4, so as to revolve the die carrying ring indirectly
through the medium of the pinion, or whether such gear is carried by the ring
itself, and therefore we have shown at Figure 5 a bevel gear 16 carried by the rear
of the die carrying ring and in engagement with the bevel gear 15.
In the construction shown at Figure 4 the bevel gears are always in engagement,
but while in the construction shown at Figure 5 the bevel gears are likewise shown
in engagement, it will be observed that we have shown in this last named figure a
construction in which the ring does not slide, and therefore these gears are neces-
sarily always in engagement. But in the instance of a sliding ring, the gear 16
would not be in engagement with the gear 15 until the ring had been forced in-
ward to the limit of its sliding movement, and the function of the engaging gears
in this instance would of course be confined to the operation of cutting off the pipe.
17 is a box bolted or otherwise secured to the usual face plate 18 of the die
carrying ring, and guided and journaled within suitable ways in the bottom of
this box, and extending directly upon and across this face plate is the cut off
tool 19 which is capable of a free sliding movement within said ways. This cut
off tool has a rack 20 formed in its shaft, and with this rack a pinion 21 meshes,
which pinion is suitably journaled within said box. 22 is a shaft journaled within
the box and carrying a worm 23, which engages with the pinion 21, said shaft
extending outside the box and having secured thereon a spur 24 which latter
occupies a plane parallel with the face plate.
25 is a pin which is inserted within a hole in one of the fingers 10 so as to be
within the field of travel of the spur as the die carrying ring is revolved. During
the revolution of the die carrying ring succeeding fingers of this spur will strike
against this pin 25 at each complete revolution of the ring, and this will of course
effect the intermittent rotation of the spur, thereby causing the intermittent
inward feed of the cut off tool 19.
It will of course be obvious that this pin 25 may be located within the rim of the
casing and may overhang so as to be within the field of the spur, and we there-
fore do not wish to be limited in this respect and the pin is of course made detachable

page_text: so that it will not cause the cut off tools to operate during the time when the pipe
is being threaded.
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 comprising a rotary die carrying ring journaled
circumferentially within a surrounding casing, the provision of means for con-
tracting the casing to compensate for wear between the latter and said ring.
2. In a pipe threading machine having a rotary die carrying ring, the provision
of a casing which surrounds said ring and affords a circumferential journal thereto,
said casing being divided or split at any convenient point, such as between the
attaching feet, and means for drawing the split portions together.
3. A pipe threading machine comprising a rotary die carrying ring, a surround-
ing casing affording a circumferential journal for said ring, said casing being pro-
vided with attaching feet and divided from edge to edge between said feet, and
means for detachably securing said feet to any suitable bench or support.
4. A pipe threading machine comprising a rotary die carrying ring journaled
circumferentially within a surrounding casing and having no movement in a
direction parallel with its axis, and a vise or other means for holding the pipe suit-
ably supported and arranged to travel toward or away from said ring.
5. In a pipe threading machine comprising a rotary die carrying ring journaled
circumferentially within a casing and having peripheral gear teeth, and a pinion
which engages said teeth, the provision of a set of bevel gears one of which is
carried by the shaft of the pinion, whereby the pinion may be revolved at different
speeds and by different instrumentalities.
6. In a pipe threading machine comprising a rotary die carrying ring journaled
circumferentially within a surrounding casing and provided with peripheral gear
teeth, and a pinion engaging with said teeth and primarily operated by a crank
movement, the provision of a bevel gear capable of being operated by a crank, and
a second bevel gear carried by said ring and capable of being engaged with the first
mentioned bevel gear, whereby the die carrying ring may be revolved either by a
system of bevel gears or by the pinion.
7. In a pipe threading machine comprising a rotary die carrying ring journaled
within a surrounding casing and capable of a sliding movement within said casing
in a line parallel with its axis, the provision of a lever pivoted to the casing and
having a plurality of points bearing against the face of the ring whereby when
said lever is swung the ring will be pushed bodily inward with an even pressure
8. In a machine for threading pipe and which comprises a casing and a rotary
die carrying ring journaled within said casing and capable of sliding therein, the
horizontally disposed bars having at their forward extremities fingers which pro-
ject against the face of said ring at diametrically opposite points, said bars and
fingers being guided within suitable ways, and the lever which is pivoted to the
casing and is loosely connected at its extremities with the rear ends of said bars.
9. In a machine for threading and cutting off pipe and which comprises a rotary
die carrying ring circumferentially journaled within a surrounding casing, the
combination of the cut off tool suitably guided and carried by said ring, feeding
mechanism also carried by said ring and connected with said tool, and a device
for operating said mechanism intermittently at each revolution of the ring.
10. In a machine for threading and cutting off pipe and which comprises a
casing and a rotary ring journaled within said casing, the combination of the
cut off tool suitably guided and carried by said ring and provided with rack teeth,
the rotary spur suitably journaled and extended from the face of the ring in
parallelism therewith, the worm carried by the shaft of said spur, the pinion
suitably journaled and meshing respectively with said rack teeth and with said
worm, and a pinion or shoulder extending from a stationary part of the machine

page_text: within the field of travel of said spur, whereby at each complete revolution of the
ring the cut off tool will be advanced.
11. In a machine of the character described and which comprises a rotary ring
journaled circumferentially within a surrounding casing, the provision of a cut
off tool carried and suitably guided within said ring, and instrumentalities con-
nected with said tool and automatically operated at each complete revolution of
the ring to intermittently advance said tool.
נית
012 Ja of Mah 1000
JENSEN & SON,
77, Chancery Lane, London, W.C., Patent Agents.