IMPROVEMENTS IN SCREW-CUTTING MACHINES
Year: 1859

page_text: LETTERS PATENT to Henry Bernoulli Barlow, of the City of Manchester,
Patent Agent, for the Invention of "IMPROVEMENTS IN SCREW-CUTTING
MACHINES."-A communication from abroad by Joseph P. Haigh, of
Pittsburg, in the State of Pennsylvania, in the United States of
America.
Sealed the 8th June 1860, and dated the 24th December 1859.
PROVISIONAL SPECIFICATION left by the said Henry Bernoulli Barlow
at the Office of the Commissioners of Patents, with his Petition, on
the 24th December 1859.
T. HENRY BERNOULLI BARLOW, of the City of Manchester, Patent Agent, do
hereby declare the nature of the said Invention for "IMPROVEMENTS IN
SCREW-CUTTING MACHINES," a communication to me from abroad by Joseph P.
Haigh, of Pittsburg, in the State of Pensylvania, in the United States of
America, to be as follows:-
The nature of this Invention consists in an improved combination and
arrangement of parts applied to the holding head of a screw-cutting machine
for opening and closing the cutting dies. The principal parts constituting this
improved combination are a pair of catch levers which are brought alternately
in position for acting on a spring catch connected to the chuck; these levers

page_text: are connected by rods having adjustable stops which are influenced by the
holding head as it moves to and fro on the slides of the machine.
Another part of this Invention consists in an improved chuck for holding
the cutting instruments of screw-cutting machines; this chuck is made with a
ring having a portion of the inside recessed to receive the outer ends of the
cutting dies, and with a cam spring, catch lever, cam, and locking stud, for
bringing the cutting dies into and out of action.
Another part of the improvements in chucks consists in making a chamber
round the die box for the cams that act on the cutting dies to travel in, also
in making the regulating stud in threo parts, namely, a bolt or pin, a cylinder,
and a nut, in order to facilitate the changing of position, and to prevent its
slipping.
The last part of this Invention consists in an improved arrangement of the
die box, cutting dies, cap and ring, also in the application of an excentric lever
to the face plate in combination with a lever, cam, locking stud, and spring
catch. The operation of the improved chuck is as follows:-The regulating
stud is set so as to allow the cutting dies to cut the desired depth of thread;
the lever is then drawn forward until the catch grasps the regulating stud; the
bolt or article to be scrowed is then placed in the chuck, and when the desired
depth of screw is cut the spring catch is pressed back against the lever until
it comes in contact with the excentric lever. This movement of the catch
and lever will move the ring with cams which will release the cutting dies
from the work.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said Henry Bernoulli Barlow in the Great Seal Patent Office
on the 22nd June 1860.
TO ALL TO WHOM THESE PRESENTS SHALL COME,. I, HENRY
BERNOULLI BARLOW, of the City of Manchester, Patent Agent, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Twenty-fourth day of December, in the year of our
Lord One thousand eight hundred and fifty-nine, in the twenty-third year of
Her reign, did, for Herself, Her heirs and successors, give and grant unto me,
the said Henry Bernoulli Barlow, Her special licence that I, the said Henry
Bernoulli Barlow, my executors, administrators, and assigns, or such others
as I, the said Henry Bernoulli Barlow, my executors, administrators, and

page_text: assigns, should at any time agree with, and no others, from time to time and at
all times thereafter during the term therein expressed, should and lawfully
might make, use, exercise, and vend, within the United Kingdom of Great
Britain and Ireland, the Channel Islands, and Isle of Man, an Invention for
"IMPROVEMENTS IN SCREW-CUTTING MACHINES," a communication to me from
abroad by Joseph P. Haigh, of Pittsburg, in the State of Pennyslvania, in
the United States of America, upon the condition (amongst others) that I, the
said Henry Bernoulli Barlow, my executors or administrators, by an instrument
in writing under my, or their, or one of their hands and seals, should particu-
larly describe and ascertain the nature of the said Invention, and in what
manner the same was to be performed, and cause the same to be filed in the
Great Seal Patent Office within six calendar months next and immediately
after the date of the said Letters Patent.
NOW KNOW YE, that I, the said Henry Bernoulli Barlow, do hereby
declare the nature of the said Invention, and in what manner the same is to
be performed, to be particularly described and ascertained in and by the
following statement:-
The nature of this Invention eonsists, first, in an improved combination
and arrangement of levers, rods, stops and springs; with the holding head of a
screw-cutting machine, for the purpose of opening and closing the cutting dies.
Second, in an improved chuck for screw-cutting machines, the improvements
consisting in furnishing the inside of a ring with a recess and cams, and the
outside with a spring catch, lever, cam, and locking stud, the said ring being
used in combination with a die box, cap, moveable stud, and an eccentric
lever, which is placed on the face plate of the running head of the screw-
cutting machine, the whole being arranged, combined, and constructed in the
manner herein-after described.
And in order that this Invention may be fully understood and readily carried
into effect, I will proceed to describe the accompanying Sheet of Drawings,
referenco being bad to the figures and letters marked thereon.
Figure 1 is a side view of a screw-cutting machine, with the improved
arrangement of parts for opening and closing the cutting dies; Figure 2 is an
end view of the machine; Figure 3 is a top view of the machine; Figure 4
is a front view of the improved chuck for screw-cutting machines, representing
the parts in the positions they occupy when the cutting dies are closed ;
Figure 5 is a face or top view of the same when the cutting dies are opened ;
Figure 6 is a top or face view of the improved chuck, the construction of
which is very similar to that shewn in Figures 4 and 5; Figure 7 is a top or

page_text: face view with the cap removed, shewing the die box and cutting dies;:
Figure 8 is a sectional view of the chuck; Figure 9 is a top or face view of
.a face plate furnished with the eccentric lever; Figure 10 is a sectional view
of the die box; Figure 11 is a top view of the ring, which is furnished on the
inside with three cams and on the outside with the spring, catch, lever, cam,
and locking stud; Figure 12 is a sectional view of the ring represented in
Figure 11; Figure 18 is a top view of one of the cams which are placed on
the inside of the ring represented in Figure 11; Figure 14 is a side view of
one of the cutting dies and an end view of one of the cams, and represents
them in proper position; Figure 15 is a side view of the cutting die; Figure 16
is an end view of the cams.
In Figures 1, 2, and 3, a is the base of the machine; h is the running head
of the machine; i, i, are the supports for the slides j, j, which support the.
holding bead d, moving back and forward on the slides. The holding head d
consists of a frame A, on Figure 2, clamps f, springs 1, and regulating
screws e; the clamps fare furnished with grooves in the ends, which are fitted
to tongues on the inside of the frame A. The whole arrangement of the
holding head is clearly shewn in Figure 2; c is the driving pulley; g is tho
face plate of the running head of the machine, to which is attached the
chuck 6 and an eccentric lever r, which is used for the purpose of closing the
cutting dies; s is a lever which is attached to the chuck, and so connected
with the cutting dies, that by a back and forward movement it will open and
close the dies; u is a regulating stud which is used in connection with tho
spring catch x, for the purpose of holding the levers in its desired position;
y is a cam, and t a locking stud, which are used in connection with the
eccentric lever r for the purpose of operating the lovers; the lever n, which
is attached to the running head h, is used in connection with the rod 1, stop p,
spring 2, sliding head d, and the eccentric lever », for the purpose of closing
the cutting dies. The lever m, which is jointed to the support i, next to the
chuck, is used in connection with the rod k, spring 2*, stop o, and sliding
head d, for the purpose of opening the cutting dies. B, in Figure 3, repre-
sents a bolt secured on the holding or sliding head d, and entering the chuck.
The stops o and p are secured to the rods k and at any desired point by
means of thumb screws, as seen in Figure 1.
The operation of these improvements is as follows:-Having the various
parts arranged, as represented in the accompanying Drawings, and the machine
put in motion, as the thread is cut in the bolt B, the sliding or holding bead d
is drawn until it comes in contact with the stop o, which will throw the

page_text: lever m forward towards the chuck, and thereby bring it in contact with the
spring catch, which will be relieved from the regulating stud u, and be
pressed back against the levers, which will by its backward motion relieve the
cutting dies from the work without stopping the machine, when the chuck
with its parts will appear as represented in Figure 5. The dies are closed by.
drawing the sliding head or holder d back until it comes in contact with the
stop p, which will throw the lever n in contact with the eccentric lever r
which will press the cam y and levers forward until the spring catch grasps
the regulating stud.u, and the eccentric lever 7 comes in contact with the
locking stud t, which will hold it until it is again relieved by coming in
contact with the lever m, which opens the cutting dies. When the cutting
dies are closed and ready for work the chuck, with its parts, will appear as
represented in Figure 4. It will be observed that the springs 2 and 2* on
the rods k and are used for the purpose of holding the levers m and n back
and free from the chuck and its parts and the eccentric lever r.
I will now proceed to describe the chuck shewn in Figures 6 to 16, which
chuck is very similar in its construction and action to that shewn in Figures
4 and 5; 9 is the face plate, which is placed on the running head. of' the
cutting machine; this plate. is furnished with an eccentric lever r, which is
held to its place in the slot s', by the bolt's; w is the, die box which is fur-
nished with a recess and slot w¹, for the regulating stud, which consists of a
bolt or pin w², cylinder w³, and nut w', see Figure 8. By making the regu-
lating stud in three parts as represented it can be changed with ease and
speed from one point to another, and will not be liable to slip or move from
the desired position in the slot w', when tightening or securing it, which is
done by simply turning the pin w²; the die box w is also furnished with a
chamber w, which extends around the whole circumference of the die box,
and is used for the cams to travel in; the dio box is also furnished with
suitable chambers for the cutting dies D, which are plainly shewn in Figures 7
and 8. D¹ is a ring which fits around the die box w, the inside of this ring is
furnished with cams z, and the outside with the spring catch x, levers, cam y,
and locking stud t; it will be observed that a portion of the inside of the ring D'
is removed or cut away to make room for the outer end of the cutting dies D.
The cams are placed in the chambers w³ of the die box, the ring D¹ is
then set to its place in the die box, and the cams are then secured to the ring
by means of screws which pass through the ring into the cams. It will be observed
that by placing the cams in chambers w³, and by securing them to the ring;
it will be held to its place in the die box. The cutting dies D are then placed

page_text: in their chambers in the die box and held to their place by means of the cap
D², which is secured to the die box by screws as shewn in Figures 6 and 7;
when the die box is furnished with the ring and its parts, the cutting dies and
cap, it is then secured to the face plate g, by means of the bolts or screws g¹; sec
Figúres 7 and 9. The cutting dies are moved out from the work by the
arrangement of the projection on the cams 2, and the notch in the
cutting dies D; the arrangement of the projection and notch is plainly
shown in Figures 15 and 16, which also shows that the cams act direct on the
end of the cutting dies in bringing them up to their work. The operation of
these improvements is as follows; having all the parts properly arranged as
represented in Figures 6, 7, and 8, the regulating stud w² is then set so as
to allow the cutting dies to cut the desired depth of thread; the lever s is then
drawn forward until the catch a grasps the regulating stud, (the catch is held
to the regulating stud by the springs a¹); the bolt or article to be threaded is
then placed in the chuck as shewn at B, Figure 3, and when the desired
length of screw is cut the spring catch is pressed back against the lever s,
until it comes in contact with the eccentric lever r; this. movement of the
catch x, and lever s, will move the ring 'D' with cams, which will move the
cutting dies D out from the work, which is then withdrawn from the chuck,
which is again set for work by pressing on the eccentric lever r, which will
pass against the cam y, and throw the lever s forward until the catch a grasps
the regulating stud w³, and the eccentric lever r comes in contact with the
locking stud t, which will hold it until relieved by the hand or by the self-
acting machinery described in reference to Figures 1, 2, and 3. It will be
observed that by the back and forward movement of the ring with its parts,
the cutting dies are brought up to and relieved from the work, and it will also
bo observed that the eccentric lever will not be required when the chuck is
used as a hand machine.
Having thus described the nature, construction, and operation of these
improvement in screw-cutting machines, as communicated to me, I declare
that I claim:-
First, the combination and arrangement of the levers m and n, rods k and 7,
stops o and p, and springs 2 and 2*, with the holding or sliding head d, and
eccentric lever r, the whole being combined, arranged, and constructed, in'
the manner described and for the purpose set forth.
Secondly, the use of the sliding or holding head d, and eccentric lever r,
when used for the purpose of opening and closing cutting dies in chucks for
screw-cutting machines.

page_text: Thirdly, the ring D' leaving a portion of the inside cut away or recessed for
the purpose of making room for the outer end of the cutting dies, the said ring
being furnished with cams on the inside and with a spring catch a, levers,
cam y, and locking, stud t on the outside as herein described and for the purpose
set forth.
Fourthly, the regulating stud when made in three parts as herein represented
and used in connection with the die box w, ring D', and spring catch x, as
herein described, and for the purpose set forth.
And, lastly, the eccentric lever r, on the face plate 9, when used in combina-
tion with the lever s, cam y, locking stud t, and spring catch a, as herein des-
cribed and for the purpose set forth.
In witness whereof I, the said Henry Bernoulli Barlow, have hereunto
set my hand and seal, this Twenty-first day of June, in the year of
our Lord One thousand eight hundred and sixty.
H. B. BARLOW. (L.S.)