Improvements in Screwing Machines.
Year: 1895

page_text: Date of Application, 4th July, 1895
Complete Specification Left, 7th Apr., 1896-Accepted, 30th May, 1896
Improvements in Screwing Machines.
I, WILLIAM WILSON HULSE, of the Ordsal Works, Salford, in the County
of Lancaster, Engineer, do hereby declare the nature of this invention to be as
follows:-
:―
This invention has reference to constructions of screwing machines designed to
screw either end separately or both ends simultaneously, of tubes, bars and the
like, bereinafter referred to as tubes.
In a combined screwing machine according to this invention the bed of the
machine is provided with two rotary screwing spindles carried by headstocks
which are mounted upon separate sliding carriages which can be independently
adjusted by hand as by a rack and pinion, along the bed, towards and away from
one another, to enable the machine to deal with tubes of various lengths. Both of
the screwing spindles are rotated by means of one shaft common to them and
driven from a cone pulley; one of the said spindles having in connection therewith
an intermediate wheel for reversing its direction of rotation relatively to the other
one, so that the two spindles may rotate simultaneously in opposite direction. The
direction of rotation of both screwing spindles can be reversed at the same time
by means of the driving cone pulley, according to the hand, right or left, of
the screw threads to be produced. Each screwing spindle is provided with an
apparatus containing multiple tools or dies which are capable of being simultaneously
advanced or withdrawn whether the spindle be revolving or be at rest.
In con-
nection with the sliding carriages carrying the screwing spindles there is provided
a guide screw having right and left handed screw threads, or two independent
guide screws, with disengaging nut or nuts to each sliding carriage, so that the
carriages can be traversed along the bed of the machine in order to assist the
screwing tools or dies in their work, and ensure the production of threads correct
in pitch. The sliding carriages are arranged to traverse towards or away from one
another, or both in the same direction, according to the hand, right or left, of the
screw threads to be produced, and the longitudinal section of the tube to be dealt
with.
One or more vices or gripping devices is or are provided for holding a tube in
position whilst being screwed. The vice, or each of them when there are more
than one, may be provided with three or more gripping jaws adapted to be simul-
taneously advanced or withdrawn at will, by inclines and worm gear or other
suitable or known means; each vice being mounted on a transverse slide provided
with a screw, rack, lever or equivalent means for bringing its centre line clear of
the machine to enable a tube to be readily passed in and out endwise. Or the
vice, or each of them, may be constructed with two gripping jaws arranged to be
advanced or withdrawn at will by a right and left handed screw, or by screws
geared together, so that a tube can be placed between them and withdrawn in a
lateral instead of an end wise direction.
Independent horizontal and vertical adjustments may be provided in the vice or
vices for enabling untrue tubes to be set as centrally as possible.
In an independent screwing machine according to this invention the bed of the
machine is provided with two rotary screwing spindles carried by headstocks which
are mounted upou separate adjustable sliding carriages as and for the purpose
hereinbefore described for the combined machine, but each of the rotary screwing
spindles is rotated by means of a separate and independent shaft and driving cone

page_text: pulley, whereby the two spindles can be rotated independently of each other in
the same or in opposite directions according to the hand, right or left, of the thread
to be produced, and the longitudinal section of tube to be dealt with. The said
spindles are each provided as before with an apparatus containing multiple tools or
dies capable of being simultaneously advanced or withdrawn whether the spindle
be revolving or at rest, and two independent guide screws with disengaging nuts to
each sliding carriage are provided to assist the screwing tools or dies in their work,
and ensure the production of threads correct in pitch.
The sliding carriages are arranged to traverse towards or away from one another,
or both in the same direction, according to the hand, right or left, of the thread to
be produced, and the longitudinal section of tube to be dealt with, and vices or
gripping devices, such as those herein before referred to, are provided to hold the
tube to be operated on.
In another construction, the rotary screwing spindles are mounted to slide.
endways in their respective headstocks and are each provided with a hob or guide-
screw of the same pitch. as that required to be produced on the tube to be dealt
with and either right or left handed according to the direction of rotation of the
spindle to which it is fixed, and in conjunction with the said hobs or guide screws
there are provided disengaging nuts whereby the rotary screwing spindles can be.
caused to slide end ways through their respective headstocks either towards or away
from each other, or both in the same direction according to the nature of the work
in hand. The screwing spindles, provided as before with multiple tools or dies,
may be rotated simultaneously in opposite directions by means of a shaft common
to them, or they may be independently rotated by separate shafts, so that they can
be rotated in the same or opposite directions at will. The carriages upon which
the headstocks are mounted, may be adjusted independently along the bed of the
machine towards and from each other; or one of them may be fixed on the bed,
the other only being adjustable to enable the machine to deal with different lengths
of tubes which are held by gripping devices as in the other arrangements herein-
* before described.
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1007
Improvements in Screwing Machines.
I, WILLIAM WILSON HULSE, of the Ordsal Works, Salford, in the County
of Lancaster, Engineer, 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 :-
This invention has reference to constructions of screwing machines designed to
screw either end separately or both ends simultaneously, of tubes, bars and the
like, hereinafter referred to as tubes.
In a combined screwing machine according to this invention, there are provided
two rotary screwing spindles carried by headstocks which are mounted upon separate
sliding carriages that can be independently adjusted by hand, as by a rack and
pinion, along the bed of the machine, towards and away from one another, to enable
the machine to deal with tubes of various lengths. Both of the screwing spindles
are rotated by means of one shaft common to them and driven from a cone pulley,
one of the said spindles having in connection therewith an intermediate wheel for
reversing its direction of rotation relatively to the other one, so that the two
spindles may rotate simultaneously in opposite direction. The direction of rotation

page_text: of both screwing spindles can be reversed, at the same time by means of the
driving cone pulley, according to the hand, right or left, of the screw threads to
be produced. Each screwing spindle is provided with an apparatus containing
multiple tools or dies which are capable of being simultaneously advanced or
withdrawn, whether the spindle be revolving or be at rest. In connection with
the sliding carriages carrying the screwing spindles, 'there is provided a guide
screw having right and left handed screw threads, or two independent guide screws,
with disengaging nut or nuts to each sliding carriage, so that the carriages can be
traversed along the bed of the machine in order to assist the screwing tools or
dies in their work, and ensure the production of threads correct in pitch. The
sliding carriages are arranged to traverse towards or away from one another, or
in some cases, both in the same direction, according to the hand, right or left,
of the screw threads to be produced, and the longitudinal section of the tube to
be dealt with. D
One or more vices or gripping devices is or are provided for holding a tube in
position whilst being screwed. The vice, or each of them when there are more
than one, may be provided with three or more gripping jaws adapted to be
simultaneously advanced or withdrawn at will, by inclines and worm gear or other
suitable or known means; each vice being mounted on a transverse slide provided
with a screw, rack, lever or equivalent means for bringing its centre line clear
of the machine to enable a tube to be readily passed in and out end wise. Or
the vice, or each of them, may be constructed with two gripping jaws arranged
to be advanced or withdrawn at will by a right and left handed screw, or by
screws geared together, so that a tube can be placed between them and withdrawn
in a lateral instead of an end wise direction.
Independent horizontal and vertical adjustments may be provided in the vice
or vices for enabling untrue tubes to be set as centrally as possible.
In the accompanying illustrative drawings,
Fig. 1 is a front elevation of a combined double-ended screwing machine
according to this invention.
Fig. 2 an elevation of the left hand end of the machine.
Fig. 3 is an elevation to a larger scale of the samé end of the machine but with
the corresponding headstock removed, and
I
Fig. 4 is a side elevation to the same scale as Fig. 3 of the tool or die holding
apparatus.
1, 1 are rotary screwing spindles each of which is tubular and provided with a
tool or die holding apparatus 2 and is carried by a headstock 3 fixed upon a
sliding carriage 4. The two carriages are capable of being independently moved
along the bed of the machine by means of a rack 5 and pinions 5 so as to enable
them to be adjusted by hand to suit the particular length of the tube to be
screwed which is held in vices 6 one of which is shown to a larger scale than Fig. 1
in Figs. 5 and 6 which are elevations at right angles to each other. Each of these
vices is provided with gripping jaws 6" that can at will be advanced towards or be
withdrawn from a tube between them by a right and left handed screw 6°. The
vices can be adjusted lengthwise of the bed and be clamped thereto in any required
position, by bolts 6c and plates 6d.
"
The hollow spindles are driven from a common shaft 7 provided at one end
with a cone pulley 7ª geared by a belt with a cone pulley arranged on a counter-
shaft above and driven through a crossed or an open bélt, at will; according to the
hand of the threads to be produced. The left hand screwing spindle (Fig. 1) is
rotated by the shaft 7 through a spur wheel 8 keyed to the spindle 1, a spur
pinion 8 (Fig. 2) keyed upon a short shaft 9 carried in brackets 10 on the head-
stock 3, a spur wheel 8 keyed upon the shaft 9, and a spur "pinion 8c that is held
between brackets 10 and is connected to the shaft 7 by a key sliding in a long key-
way. The right hand screwing spindle is simultaneously rotated by the shaft 7,
but in the reverse direction, through spur wheels and pinions 8, 8" 8b, 8° and an
intermediate spur wheel 8d fixed to a short 'shaft 12 carried in brackets 10. "

page_text: The spindles 1 are each shown provided with a screwing head 2 containing
multiple tools or dies 2ª that are held in radial slots formed through the head 2 and
are adapted to be simultaneously advanced or withdrawn by the end wise movement
of blocks or parts 2b that are retained in longitudinal recesses in the head 2 and
are formed with grooves 2* inclined to the axis of the spindle and with which
projections on the tools or dies, or their carriers, engage. The end wise movement
of the blocks or parts 2b is effected by the rotation relatively to the spindle 2 of a
loose ring 2 that is formed internally with screw threads engaging with part screw
threads formed on the cuter portion of each block or part 2b. If the spindle be
at rest, this ring may be rotated by hand by means of a bar inserted in holes
formed around it, and, if it be revolving, by operating a hand lever 2d pivoted to
the carriage 4 and adapted by means of an extension 2° to engage a stop 2 adjustably
mounted upon the loose ring 2º. 2' is a disengaging stop, which is secured to the
head 2 and is adapted to come in contact with the extension 2° and disengage the
lever 2 from the stop 2, when the ring has been held long enough to have caused
the complete withdrawal of the tools.
A guide screw 13 with right and left hand threads extends along the bed of the
machine and is driven through change wheels 7* from the shaft 7. Each carriage 4
is provided with a sliding part nut 14, which can be moved laterally, so as to be
engaged with or disengaged from the guide screw 13, by means of a rod 15
connected with a bell crank lever 16 having an eccentric or cam slot 16ª formed
in it and through which passes a pin 14ª that extends through the part nut 14.
In an independent screwing machine according to this invention there are
provided two rotary screwing spindles carried by headstocks which are mounted
upon separate adjustable sliding carriages as and for the purpose hereinbefore
described for the combined machine, but each of the rotary screwing spindles is
rotated by means of a separate and independent shaft and driving cone pulley,
whereby the two spindles can be rotated independently of each other in the same
or in opposite directions according to the hand, right or left, of the thread to be
produced and the longitudinal section of tube to be dealt with. The said spindles
are each provided as before with an apparatus containing multiple tools or dies
capable of being simultaneously advanced or withdrawn whether the spindle be
revolving or at rest, and two independent guide screws with disengaging nuts to
each sliding carriage are provided to assist the screwing tools or dies in their work,
and ensure the production of threads correct in pitch.
The sliding carriages are arranged to traverse towards or away from one another,
or both in the same direction, according to the hand, right or left, of the thread
to be produced, and the longitudinal section of tube to be dealt with, and vices or
gripping devices, such as those herein before referred to, are provided to hold the
tube to be operated on.
Figs. 7 and 8, are respectively a part elevation, and an end elevation of an
independent screwing machine according to this invention; Fig. 8 being drawn to
a larger scale than Fig. 7; both the headstocks 3 are shown but only one screwing
spindle and its driving gear. In this arrangement separate and independeni
driving shafts 7, 7* are provided, each being geared to one of the screwing
spindles 1 by a worm wheel 8, (Fig. 8) a worm 8 keyed upon a short cross
shaft 18, mounted in bearings 18 on the headstock, a bevel wheel 8 fixed at
the outer end of the shaft 18, and a bevel wheel 8 keyed upon the driving
shaft 7 or 7*. 13, 13* are two independent guide screws driven respectively
from the shafts 7 and 7* through change wheels 7 as shown. Each sliding
carriage 4 is provided with a disengaging nut 14 adapted to be engaged with
its respective guide screw in the manner herein before described.
In another construction, the rotary screwing spindles are mounted to slide end-
ways in their respective headstocks and are each provided with a hob or guide-
screw of the same pitch as that required to be produced on the tube to be
dealt with and either right or left handed according to the normal direction of
rotation of the spindle to which it is fixed, and in conjunction with the said hobs

page_text: or guide screws there are provided disengaging nuts whereby the rotary screwing
spindles can be caused to slide end ways through their respective headstocks
either towards or away from each other, or both in the same direction, according
to the nature of the work in hand. The screwing spindles, provided as before
with multiple tools or dies, may be rotated simultaneously in opposite directions
by means of a shaft common to them, or they may be independently rotated by
separate shafts, so that they can be rotated in the same or opposite directions at
will. The carriages upon which the headstocks are mounted, may be adjusted
independently along the bed of the machine towards and from each other; or
one of them may be fixed on the bed, the other only being adjustable, to enable
the machine to deal with different lengths of tubes which are held by gripping
devices as in the other arrangements herein before described.
Figs. 9 and 10 are respectively a partial front elevation, and an end elevation to
a larger scale of a combined machine in which the screwing spindles are mounted
to slide endways in their respective headstocks 3. Each rotary screwing spindle 1
has secured to its outer end a hob cr guide screw 13 provided with a divided
disengaging nut 14 that is carried in a bracket extending from the headstock and
is adapted to be advanced towards and withdrawn from the screw 13 by means of a
right and left handed screw 19 and crank handle 19" 19" is an adjustable stop to
prevent the nut being caused to grip the screw 13 too tightly. To enable the
spindle to be quickly returned or withdrawn after the screwing operation is
completed, its outer or rear end is formed as a circular rack 20 with which gears
a pinion 20 fixed on a cross shaft 20 provided with a hand wheel 20°.
The spindles 1 are rotated from a shaft 7 common to them through spur gear.
The shaft 7 has connected to it by a feather and groove connection, a sleeve having
two spur wheels 7° 7° of different diameters which can be caused by means of a
lever 21 to gear respectively and at different times with the spur wheel 8 on the
spindle and a spur wheel 7d keyed upon a short shaft 9 which also has fixed to it a
spur wheel 7 that is permanently in gear with the wheel 8. During the screwing
operation the spindles may be slowly rotated from the shaft 7 through the spur
wheels 7 7 7° and or at a higher speed direct through the spur wheels 7 and 8,
the variations of speed enabling approximately the same cutting speed to be
attained with different diameters of work.
The headstocks can be adjusted to any desired position along the bed and fixed
by bolts in the same way that the gripping vices (which are not shown) are
fixed.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
:-
1. A screwing machine constructed and operating substantially as hereinbefore
described with reference to Figs. 1 to 4 inclusive of the accompanying illustrative
drawings.
2. A screwing machine constructed and operating substantially as hereiubefore
described with reference to Figs. 7 and 8 inclusive of the accompanying illustrative
drawings.
3. A screwing machine constructed and operating substantially as hereinbefore
described with reference to Fios 9 and 10 inclusive of the accomnanging illustrative