IMPROVEMENTS IN MACHINERY FOR CUTTING SCREWS
Year: 1865

page_text: LETTERS PATENT to Joseph Tangye, of the Firm of Tangye, Brothers,
and Price, of Birmingham, in the County of Warwick, Manufacturers,
for the Invention of "IMPROVEMENTS IN MACHINERY FOR CUTTING SCREWS."
PROVISIONAL SPECIFICATION left by the said Joseph Tangye at the
Office of the Commissioners of Patents, with his Petition, on the 14th
October 1865.
I, JOSEPH TANGYE, of the Firm of Tangye, Brothers, and Price, of
Birmingham, in the County of Warwick, Manufacturers, do hereby
declare the nature of the said Invention for "IMPROVEMENTS IN MACHINERY
FOR CUTTING SCREWS," to be as follows:-
My Invention consists of the improvements herein-after described in
machinery. for cutting screws by which improvements two, three, or more
screws may be cut simultaneously in the same machine.
I will describe my improvements in connection with a screw cutting
machine constructed to cut three screws simultaneously. On the bed of
the machine, and in the place occupied in ordinary screw. cutting lathes by
the lathe head, is a head carrying a fixed axis on which the cone of driving

page_text: pulleys turns. Between the said pulleys and the said head is a pinion
connected to and turning with the said pulleys. The said pinion gears
with another pinion immediately over it, which second pinion is fixed to a
shaft passing through the head. The said shaft is geared by means of
toothed wheels to the centre, to which one of the rods on which a screw
is to be cut is fixed. The said centre is immediately under the said shaft.
The motion of the said centre is transmitted by means of pinions and
toothed wheels to two other centres, one on either side, and the three
centres are thus made to rotate simultaneously and give motion simul-
taneously to three rods on which screws are to be cut. The centres,
between which the rods to be screwed are placed, are similar to those of
the ordinary screw cutting lathe. The rest, by which the cutting tools
are carried, is provided with three holders for carrying the three cutting
tools by which the screws are cut on the three rods. Each of the holders
has an adjusting screw. The rest and the three cutting tools are actuated
by one screw.
The arrangements of parts for cutting two or more than three screws
simultaneously, differ in no essential respect from the arrangements de-
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said Joseph Tangye in the Great Seal Patent Office on the
13th April 1866.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JOSEPH
TANGYE, of the Firm of Tangye, Brothers, and Price, of Birmingham, in
the County of Warwick, Manufacturers, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Fourteenth day of October, in the year of
our Lord One thousand eight hundred and sixty-five, in the twenty-ninth
year of Her reign, did, for Herself, Her heirs and successors, give and
grant unto me, the said Joseph Tangye, Her special licence that I, the
said Joseph Tangye, my executors, administrators, and assigns, or such
others, as I, the said Joseph Tangye, my executors, administrators, and
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

page_text: :
of Great Britain and Ireland, the Channel Islands, and Isle of Man, an
Invention for " IMPROVEMENTS IN MACHINERY FOR CUTTING SCREWS," upon the
condition (amongst others) that I, the said Joseph Tangye, my executors,
or administrators, by an instrument in writing under my, or their, or one of
their hands and seals, should particularly 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. i
"
NOW KNOW YE, that I, the said Joseph Tangye, do hereby declare the
nature of the said Invention, and in what manner the same is to be per-
formed, to be particularly described and ascertained in and by the
following statement thereof, that is to say:-
"My Invention consists of the improvements herein-after described in
machinery for cutting screws, by which improvements two, three, or more
screws may be cut simultaneously in the same machine.
I will describe my improvements in connection with a screw cutting
machine constructed to cut three screws simultaneously. On the bed of
the machine, and in the place occupied in ordinary screw cutting lathes
by the lathe head, is a head carrying a fixed axis on which the cone of
driving pulleys turns. Between the said pulleys and the said head is a
pinion connected to and turning with the said pulleys. The said pinion
gears with another pinion immediately over it, which second pinion is fixed
to a shaft passing through the head. The said shaft is geared by means of
toothed wheels to the centre, to which one of the rods on which a screw is
to be cut is fixed. The said centre is immediately under the said shaft.
The motion of the said centre is transmitted by means of pinions and
toothed wheels to two other centres, one on either side, and the three
centres are thus made to rotate simultaneously and give motion simul-
taneously to three rods on which screws are to be cut. The centres
between which the rods to be screwed are placed, are similar to those of
the ordinary screw cutting lathe. The rest, by which the cutting tools
are carried, is provided with three holders for carrying the three cutting
tools by which the screws are cut on the three rods. Each of the holders
has an adjusting screw. The rest and the three cutting tools are actuated
by one screw. The arrangements of parts for cutting two or more thau
three screws simultaneously, differ in no essential respect from the arrange-
ments described:

page_text: Having explained the nature of my Invention, I will proceed to describe,
with reference to the accompanying Drawing, the manner in which the
same is to be performed.
ر
Figure 1 represents in side elevation, and Figure 2, in plan, a machine
for cutting three screws simultaneously, the said machine being constructed
according to my Invention. The..same letters of reference. indicate the
same parts in both Figures. On the bed a of the machine, and in the
place occupied in ordinary screw-cutting lathes by the lathe head, is a
head 6 carrying a fixed axis c, on which the cone of driving pulleys & turns.
Between the said pulleys and the said head is a pinion e connected to and
turning with the said pulleys d. The pinion e gears with a second pinion
f, the said second pinion f being carried by a shaft g, which passes through
the head b. h are the three rods or partly made screws placed between the
centres i and k; the said centres being similar to those of the ordinary
screw cutting lathe. Each of the centres i has a toothed wheel, marked
respectively l, m, n, and the said toothed wheels are geared together by
the pinions o, p; the pinion p being the driving pinion receiving motion as
before explained from the axis c, through the pinions e, f, and shaft g. By
gearing together the three centres, i, i, i, of the rods h to be screwed in
the manner described and represented, the said centres are made to rotate
simultaneously, and in the same direction, and give motion simultaneously
to the three rods to be screwed. q is the rest of the machine provided
with three holders r, with adjusting screws, in which holders the three
cutting tools & are carried. The rest q is actuated by one screw marked
t, the motion of which screw is transmitted from the end toothed wheel /
to the said screw, by the pinion u and toothed gearing and w. The rela-
tive speeds of the centres i, i, i, and the screw t actuating the rest q may
be varied at pleasure. The machine described and represented is worked
in all essential respects as if it were a single screw cutting lathe. By the
use of the machine great economy in the production of large screws is
secured. Instead of cutting three screws simultaneously as described, two
screws only, or more than three screws, may be cut simultaneously, by
increasing the number of centres and cutting tools, and gearing the parts
together in the manner already described.
Having now described the nature of my Invention and the manner in
which the same is to be performed, I wish it to be understood that I do
not limit myself to the precise details herein described and represented in
the accompanying Drawing, as the same may be varied without departing

page_text: from the nature of my Invention; but I claim as my Invention, the
arrangement or combination of the parts herein-before described and
represented in the accompanying Drawing, for cutting two or more screws
simultaneously in the same machine.
In witness whereof, I, the said Joseph Tangye, have hereunto set my
hand and seal, this Tenth day of April, in the year of our Lord
One thousand eight hundred and sixty-six.
Witness,
GEORGE SHAW.
JOSEPH TANGYE. (L.S.)