AN IMPROVED SCREW CUTTER OR SCREW STOCK
Year: 1874

page_text: LETTERS PATENT to William Edward Gedge, of No. 11, Wellington
Street, Strand, in the County of Middlesex, Patent Agent, for the
Invention of "AN IMPROVED SCREW CUTTER OR SCREW STOCK."--A
communication from abroad by Wilhelm Schmitz, of Ehrenfeld,
near Cologne, Prussia.
PROVISIONAL SPECIFICATION left by the said William Edward Gedge
at the Office of the Commissioners of Patents, with his Petition,
on the 4th November 1874.
I, WILLIAM EDWARD GEDGE, of No. 11, Wellington Street, Strand,
in the County of Middlesex, Patent Agent, do hereby declare the
nature of the said Invention for "AN IMPROVED SCREW CUTTER OR SCREW
STOCK," a communication to me from abroad by Wilhelm Schmitz, of
Ehrenfeld, near Cologne, Prussia, to be as follows:-
-
This Invention will be understood by reference to the accompanying
Sheet of Drawing, upon which Figure 1 represents a plan or top view of
a screw stock of this Invention with cover plate removed; Figure 2 is a
side view of the same; Figure 3, a plan of centre portion of stock, showing

page_text: position of dies; Figure 4 represents in dotted lines the altered position
of dies when moved by means of the screw; and Figure 5 is also a
plan of the centre portion, but fitted with cover plate.
position of dies; Figure 4 represents in dotted lines the altered position
of dies when moved by means of the screw; and Figure 5 is also a
plan of the centre portion, but fitted with cover plate.
A is the stock, having in its centre portion a triangular recess B.
O, set screw, by means of which the nut c is caused to travel in the
opening a.
D is the cover plate, secured to the stock by the screws d, d, d.
E, F, G, are the dies, in one of which is a slot e to receive the end of
nut c, and fitted so as to work in the recess B.
From the above Drawing it will be seen that upon the screw C being:
turned the nut c is made to travel, and with it the die E, and since, owing
to the construction of the dies, any movement of the one must cause a
corresponding movement in the. others, the dies F and G are also made
to travel, thus enlarging or reducing the apertures x for cutting the
screw thread. See dotted lines, as shown in Figure 4.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said William Edward Gedge in the Great Seal Patent
Office on the 3rd May 1875.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, WILLIAM
EDWARD GEDGE, of No. 11, Wellington Street, Strand, in the County
of Middlesex, Patent Agent, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Fourth day of November, in the year
of our Lord One thousand eight hundred and seventy-four, in the
thirty-eighth year of Her reign, did, for Herself, Her heirs and suc-
cessors, give and grant unto me, the said William Edward Gedge, Her
special licence that I, the said William Edward Gedge, my executors,
administrators, and assigns, or such others as I, the said William Edward
Gedge, 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 of Great Britain
and Ireland, the Channel Islands, and Isle of Man, an Invention for

page_text: "AN IMPROVED SCREW CUTTER OR SCREW STOCK," a communication
to me from abroad by Wilhelm Schmitz, of Ehrenfeld, near Cologne,
Prussia, upon the condition (amongst others) that I, the said
William Edward Gedge, my executors or administrators, by an instru-
ment 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.
NOW KNOW YE, that I, the said William Edward Gedge, 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 :—
. This Invention has for its object an improved screw stock, by which
screws may be cut better and quicker than by those in ordinary use.
In the improved screw cutter or screw stock, the subject of this
Invention, one die is set in motion by the other in such a way that the
cutters of the dies always have an exact and central movement, thereby
cutting with the same exactitude in every position.
The accompanying Sheet of Drawing represents a screw cutter or
screw stock embodying this Invention-Figure 1 representing a plan
or top view of a screw stock with cover plate removed; Figure 2, a side
view of the same; Figure 3, a plan of the centre portion of the stock
(the cover plate being removed) shewing position of the dies; Figure 4,
a similar view, but with cover plate on and position of dies altered, so
as to present a large opening; and Figure 5 shews the triangular
opening in centre portion of stock, the dies being removed.
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page_text: The action is as follows:-On the screw. being turned the nut e is
made to travel, and with it the die E, and since, owing to the con-
struction of the dies, any movement of the one must cause a corre-
sponding movement in the others, the dies F and G are also made to
travel, thus enlarging or reducing the aperture B for cutting the screw
thread.
The three dies are of equal dimensions; they are firmly secured in
position, and there is abundance of space on their cutting sides for the
cuttings to fall through.
It will be evident that one of the dies acting as a wedge to produce
the motion of the other, each of the dies has a parallel motion to the
opening, and that the cutters making the same movement are always in
a circle, and have one and the same centre. Thus an exactly central
movement is obtained, whereby the situation of each of the cutters to
the circumference of the screw or bolt to be cut is invariably the same,
as is also the manner in which the cutting takes place.
Having now described and ascertained the nature of the Invention
communicated to me as aforesaid, and in what manner the same is or
may be performed, I claim as secured to me by the herein-before in part
recited Letters Patent,-
Firstly. The use in combination with the wedge movement of the
particular method by which with one single motion the three dies are
moved in an exactly central direction, substantially as herein-before
set forth.
Secondly. The use of a screw stock, substantially as above described,
in which the moving of one die causes the other two to travel in a
central direction.
In witness whereof, I, the said William Edward Gedge, have
hereunto set my hand and seal, this Third day of May, in
the year of our Lord One thousand eight hundred and seventy-