Improvements in the Manufacture of Door Chains.
Year: 1891

page_text: Date of Application, 11th Aug., 1891
Complete Specification Left, 11th May, 1892-Accepted, 2nd July, 1892
PROVISIONAL SPECIFICATION.
Improvements in the Manufacture of Door Chains.
WILLIAM JAMES GIBBONS 37 Ludgate Hill Birmingham Brassfounder do
hereby declare the nature of this invention to be as follows:-
The improvements in these door chains relate chiefly to the part called the box,
which is made of sheet metal in the following way :-
A strip of metal of the required length and width is taken, and by the aid of dies
used in connection with a stamp, press, or draw-bench, the centre of the strip of
metal is raised and a flange formed on either side for the reception of the screw-
holes. When the dies are used in connection with a draw-bench the metal is drawn
in long strips and cut to the required length afterwards. A slot is then pierced
in the box thus formed similar to that in the box of an ordinary door chain, except
that at intervals, notches are cut in the edges of the slot, in either of which the
hook attached to the chain may be placed, thereby allowing the door to be secured
at various points. An additional notch is cut at the extreme end of the box, which
allows the door to be securely fastened when closed. The notches are cut on both
the top and bottom edges of the slot so as to be available for either right or left
hand doors. The notches are a most important feature of the invention, and may
be applied to any make of door chains.
Dated this 8th day of August 1891.
WILLIAM JAMES GIBBONS.
COMPLETE SPECIFICATION.
Improvements in the Manufacture of Door Chains.
WILLIAM JAMES GIBBONS 37 Ludgate Hill Birmingham Brassfounder do
hereby declare the nature of this invention and in what manner the same is to be
performed, to be particularly described and ascertained in and by the following
statement :-
The improvements in these door-chains relate chiefly to the part called the box
which is made from sheet metal in the following way. A strip of metal of the
required length and width is taken, and by the aid of dies used in connection with
a stamp, press, or draw-bench the centre of the strip of metal is raised and a flange
formed on either side for the reception of screw-holes (Fig. 1). When the dies
are used in connection with a draw-bench the metal is drawn in long strips and cut
to the required length afterwards. A slot is then pierced in the box thus formed
similar to that in the box of an ordinary door-chain, except that at intervals notches
are cut on the edges of the slot (Fig. 24) in either of which the hook attached to
the chain may be placed, thereby allowing the door to be secured at various points.
An additional notch is cut at the end of the box (Fig. 2B) which on the insertion
of the hook therein securely fastens the door when closed. The notches are cut
ou both the top and bottom edges of the slot. so as to make the article available
for either right or left hand doors. The notches are a most important feature of
the invention and may be used in connection with any existing make or pattern of
door-chain.

page_text: Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what
claim is
1. The making of the box from sheet metal in the manner already described.
2. The notches along the top and bottom edges of the slot.
3. The additional notch at the end of the box.
Dated this 0th day of Max 1800
WILLIAM JAMES GIBBONS.