IMPROVEMENTS IN THE MANUFACTURE OF SCREW SOCKETS OR CUPS
Year: 1885

page_text: I WALTER JOHN MAY of the Firm of May and Padmore of 123 Leopold Street
Birmingham in the County of Warwick Brassfounder do hereby declare the nature
of the said invention for IMPROVEMENTS IN THE MANUFACTURE OF SCREW
SOCKETS OR CUPS" and in what manner the same is to be performed to be
particularly described and ascertained in and by the following statement to be as
follows that is to say:-
My invention has for its object improvements in the manufacture of screw
sockets or cups which are used as a liner around the neck of screws and under the
head thereof being sunk into the timber or other material around or upon the hole.
They are for the purpose of maintaining a clean accurate hole in cases where screws
may be repeatedly withdrawn and re-entered in which cases frequently driving
home the screw has a great tendency to enlarge the entrance to the hole until in
time the head of the screw is quite buried or otherwise the screw is very loose if
not thoroughly driven home. Such sockets have hitherto either been made from
cast metal in which case they are rough and coarse outside and lack internal
accuracy or they have been formed hollow from sheet metal which prevents the
corrugated outside configuration being imparted. Now by my new process of
manufacturing these sockets or cups I am enabled to impart to them a clean
external corrugated surface with a perfectly true and clean internal shape and
surface so as to be a better finished article in all respects than heretofore.
In order that my invention may be better understood and more easily understood
I have appended hereunto a sheet of drawings upon which is shown enlarged views
the article at the various stages of the process of manufacture and by which I will
now proceed to explain the details thereof:-
:-
Figure 1, is a side elevation of a long round bar or rod of metal from which
I sever round discs.
Figures 2 and 3 are plan and edge elevation of a disc so severed from the round
rod or otherwise provided from metal of sufficient softness and toughness to be
capable of being manipulated into the required configuration without splitting or
breaking.
Before the next step in the process is reached a suitable outside mould or die has
to be formed which is made to the desired outward configuration of the socket or
cup. i.e. having the corrugations or grooves or flutes running at intervals along the

page_text: .
surface. Into this external die or mould the discs as shown by Figures 2 and 3
are placed one at a time and whilst there an upper stamp press or tool is brought
upon it forcing it into the required external shape.
Figure 4, is a plan of the outer or large end of the metal piece when it has
passed through the outer die.
Figure 5, is a plan of the small or inner end.
Figure 6 is a side elevation of Figure 4 and Figure 5.
These solid pieces of metal thus outwardly shaped are now taken each separately
in a holding tool, die or socket or other recess or machine in such a manner that a
combined drill and countersinking tool may be brought down upon the larger end
or face for the purpose of cutting out the tapered or other shaped inside by a
revolving motion of such tool.
Figure 11, is a cross sectional elevation of the socket or cup finished as otherwise
illustrated by Figures 7 and 8.
Figure 9 shows the side elevation of a cup or socket of superior quality still.
Figure 10 is a plan of the small end of Figure 9.
On reference to the drawing it will be seen that there are projecting teeth a, a
which would enter the timber or other material when driven in and that these
teeth are formed each by one of the ribs on the outside of the socket or cup.
These I produce in the exact manner shown by a recessing tool which dishes
out the metal from the smaller face thereof leaving the said projections a a as
shown.
0
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I claim is
(1.) The improvements in the manufacture of screw sockets or cups from solid
discs of metal such as shown by Figures 2 and 3 by forming them externally in an
outward die under pressure or concussion which are afterwards internally shaped
so as to produce the article as shown by Figures 7,8 and 11 substantially as herein
set forth.
(2.) The sockets or cups shown by Figures 9 and 10 and the mode of manu-
facturing the same substantially as herein set forth and illustrated.
GEORGE BARKER,
Agent for the Applicant,
77, Colmore Row, Birmingham.