IMPROVEMENTS IN THE MANUFACTURE OF BRASS SCREW NUTS
Year: 1878

page_text: LETTERS PATENT to William Edward Everitt, of Birmingham, in the County
of Warwick, Manufacturer, for the Invention of "IMPROVEMENTS IN THE
MANUFACTURE OF BRASS SCREW NUTS."
PROVISIONAL SPECIFICATION left by the said William Edward Everitt at
the Office of the Commissioners of Patents on the 20th July 1878.
WILLIAM EDWARD EVERITT, of Birmingham, in the County of Warwick,
Manufacturer. IMPROVEMENTS IN THE MANUFACTURE OF BRASS SCREW NUTS."
My Invention consists in manufacturing brass screw nuts in the following'
manner-I make tubes of brass, having an octagonal, hexagonal, or other angular
figure externally, and having a cylindrical figure internally. The said tubes have
such a strength or thickness of metal that their external or angular figure corre-
sponds to the external angular figure of the screw nuts to be manufactured, and
their internal diameter suitable for the production of the concave screw of the screw
nut. The said tubes of brass are made by the ordinary drawing process, or partly
by rolling and partly by drawing. The said tubes are cut transversely into pieces
slightly longer than the screw nut to be produced.
By means of a rotating facing tool the required flat surface is given to the bottom
of the screw nut, and the required shoulder and facing on the top of the nut are
made by turning in a lathe.
I prefer to finish the top of the screw nut after the required concave screw has
been cut in the interior of the screw nut.
In cutting the interior concave screw I either operate upon the screw nut singly,
that is, on the pieces or lengths cut from the tubing, as herein-before described; or
Di

page_text: I take a length of the said tubing, sufficient to make several screw nuts, and form
the screw thread in the interior of the said tubing before cutting it up into lengths
suitable for screw nuts.
I effect the screwing or tapping of the interior of the tube or of the short lengths
by the ordinary method and by the use of the ordinary tools.
Where high finish is required the octagonal or other plane faces of the screw nut
may be finished by filing or other finishing process, but the said faces are so well
formed by the drawing process that for general purposes no further treatment of
the said faces is necessary.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said William Edward Everitt in the Great Seal Patent Office on the
10th January 1879.
$5
WILLIAM EDWARD EVERITT, of Birmingham, in the County of Warwick,
Manufacturer. IMPROVEMENTS IN THE MANUFACTURE OF BRASS SCREW NUTS."
My Invention consists in manufacturing brass screw nuts in the following
nanner-I make tubes of brass, having an octagonal, hexagonal, or other angular
figure externally, and having a cylindrical figure internally. The said tubes have
such a strength or thickness of metal that their external or angular figure corre-
sponds to the external angular figure of the screw nuts to be manufactured, and
their internal diameter suitable for the production of the concave screw of the screw
nut. The said tubes of brass are made by the ordinary drawing process, or partly
by rolling and partly by drawing. The said tubes are cut transversely into pieces
slightly longer than the screw nuts to be produced.
By means of a rotating facing tool the required flat surface is given to the
bottom of the screw nut, and the required shoulder and facing on the top of the
nut are made by turning in a lathe.
I prefer to finish the top of the screw nut after the required concave screw has
been cut in the interior of the screw nut.
In cutting the interior concave screw I either operate upon the screw nuts singly,
that is, on the pieces or lengths cut from the tubing, as herein-before described; or
I take a length of the said tubing, sufficient to make several screw nuts, and form
the screw thread in the interior of the said tubing before cutting it up into lengths
suitable for screw nuts.
I-effect the screwing or tapping of the interior of the tube or of the short lengths
by the ordinary method and by the use of the ordinary tools.
Where high finish is required the octagonal or other plain faces of the screw nuts
may be finished by filing or other finishing process, but the said faces are so well
formed by the drawing process that for general purposes no further treatment of
the said faces is necessary.
I will now proceed to describe, with reference to the accompanying Drawing,
the manner in which my Invention may be performed.
'
Figure 1 represents in elevation, and Figure 2 in cross section a brass tube,
having a hexagonal figure externally, and a cylindrical figure internally, which I
use for manufacturing screw nuts according to my Invention, the said tube, Figures
1 and 2, being made by drawing, or partly by rolling and partly by drawing, the
said drawing and rolling processes being effected in the ordinary way and by the
use of the ordinary tools.
When octagonal or square screw nuts are to be made the exterior of the drawn
or rolled and drawn tube has an octagonal or square figure in cross section instead
of the hexagonal figure represented.
In making screw nuts from the tube, Figures 1 and 2, I cut the said tube
transversely at the dotted lines a, a, Figure 1, into nut blanks or pieces a little
longer than the screw nuts to be made. A nut blank thus cut from the tube is
represented in elevation in Figure 3, and section in Figure 4. I cut the nut blanks
from the tube, Figures 1 and 2, by a circular saw.
Nut blanks of the kind represented in Figures 3 and 4 are by preference next
screwed or tapped internally, as represented in the finished screw nut shown in
elevation in Figure 5, section in Figure 6, and end elevation in Figure 7, the
screwing or tapping of the holes in the nut blanks being effected by the ordinary
method and by the use of the ordinary tools.
After or before screwing the nut blanks, as may be preferred, the bottom c of the
screw nut is dressed so as to give a flat surface to it by means of a rotating facing
tool, and the top d of the screw nut is finished by facing it and producing the
required shoulder by turning in a lathe or by a revolving cutter.

page_text: Instead of screwing the nut blanks or short pieces after they have been cut from
the tube, the tube may be screwed or tapped internally before the nut blanks or
partly made screw nuts are cut therefrom.
Figure 8 represents partly in elevation and partly in longitudinal section, and
Figure 9 in cross section, a piece of tubing of the kind represented in Figures 1
and 2, but screwed or tapped internally.
I cut short pieces or nut blanks from the screwed tube, Figures 8 and 9, at the
dotted lines a, a, Figure 8, and finish the said blanks, and convert them into screw
nuts by facing their bottoms and facing and shouldering their tops in the manner
described with respect to the screw nut, Figures 5, 6, and 7.
-
By making brass screw nuts from drawn or rolled and drawn tubes as described
and illustrated, the exterior faces of the said screw nuts require little or no finishing,
and in addition to this advantage the said screw nuts are very dense and tough,
and will bear a much greater strain, and consequently are less liable to burst than
ordinary cast screw nuts.
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 claim as my Inven-
tion of improvements in the manufacture of brass screw nuts, the process or combi-
nation of processes, herein-before described, and illustrated in the accompanying
Drawing, for the manufacture of brass screw nuts, that is to say, making the said
screw nuts by taking a drawn or rolled and drawn tube of brass, having a hexagonal,
octagonal, or other angular figure externally, and having a cylindrical figure
internally cutting the said tube transversely into short pieces or nut blanks, and
screwing or tapping the said nut blanks internally and finishing them externally,
as described and illustrated; or taking a tube of the kind described and screwing
or tapping it internally, and cutting short pieces or partly made screw nuts
transversely from the said screwed tube, and afterwards finishing the said screw
nuts externally, as described.
In witness whereof; I, the said William Edward Everitt, have hereunto set
my hand and seal, this Seventh day of January, in the year of our Lord
One thousand eight hundred and seventy-nine.
Witness,
A. I. OWEN,
118, Cannon St.,
City,
London.
WILLIAM EDWARD EVERITT. (L.S.)