AN IMPROVEMENT IN THE MANUFACTURE OF CAST HINGES."
Year: 1856

page_text: LETTERS PATENT to Francis William Gerish, of East Road, City Road,
for the Invention of "AN IMPROVEMENT IN THE MANUFACTURE OF CAST
HINGES."
PROVISIONAL SPECIFICATION left by the said Francis William Gerish
at the Office of the Commissioners of Patents, with his Petition, on
the 4th January 1856.
1, FRANCIS WILLIAM GERISII, of East Road, City Road, do hereby declare
the nature of the Invention for "AN IMPROVEMENT IN THE MANUFACTURE OF
CAST HINGES" to be as follows:-
This Invention has for its object an improvement in the manufacture of
cast hinges. For this purpose, one flap of a hinge is first cast with two pro-
jections, in each of which is a conical hollow, either cast or subsequently
produced. This flap is then placed in a mould suitable for forming the other
flap, and iron or other metal is then run into the mould, by which the other
flap will be produced with conical projections fitting the conical hollows in the
other flap; and by reason of the shrinking of metal of the second flap, the two
cones which form the axes by which the two flaps are combined will become
free in the conical hollows, and work freely therein; or the flaps first cast may
be cast with the projecting conical axes, and then the other or second flap will
be cast with the two hollows to retain such projecting cones.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said Francis William Gerish, in the Great Seal Patent Office on
the 3rd July 1856.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, FRANCIS
WILLIAM GERISH, of East Road, City Road, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Fourth day of January, in the year of our Lord
One thousand eight hundred and fifty-six, in the nineteenth year of Her
reign, did, for Herself, Her heirs and successors, give and grant unto me,
the said Francis William Gerish, Her special licence that I, the said Francis
William Gerish, my executors, administrators, and assigns, or such others as
I, the said Francis William Gerish, myexecutors, 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
inake, use, exercise, and vend, within the United Kingdom of Great Britain
and Ireland, the Channel Islands, and Isle of Man, an Invention for "AN
IMPROVEMENT IN THE MANUFACTURE OF CAST HINGES," upon the condition (amongst
others) that I, the said Francis William Gerish, my executors or adminis-
trators, by an instrument in writing under my, or their, or one of their bands
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 Francis William Gerish, 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 thereof, that is to say:-
This Invention has for its object an improvement in the manufacture of cast
hinges. For this purpose, one flap of a hinge is first cast with two projections,
in cach of which is a conical hollow, either cast or subsequently produced.
This flap it then placed in a mould suitable for forming the other flap, and iron
or other metal is then run into the mould, by which the other flap will be pro-
duced with conical projections fitting the conical hollows in the other flap, and
by reason of the shrinking of metal of the second flap, the two cones which
form the axes by which the two flaps are combined will become free in the
conical hollows, and work freely therein; or the flap first cast may be cast with
projecting conical axes, and then the other or second flap will be cast with two
hollows to correspond with such projecting cones.

page_text: DESCRIPTION OF THE DRAWING.
Figure 1 is a side view, Figure 2 a transverse section (taken at the line
1, 2, Figure 1), and Figure 3 a longitudinal section, of a strap hinge, made
according to my Invention. A is the flap of the hinge which is first cast; and
B is the flap which is afterwards cast thereon. The flap A has two projections
a, a, on its face, in which are conical holes a', u', (as is shewn by the Draw-
ing). This flap may be moulded in sand and cast in the ordinary manner.
Afterwards a sand mould is prepared from a pattern, which represents the
complete hinge as it is shewn in Figure 1, and when the pattern is drawn, the
flap A previously cast is introduced into its place in the mould, and molten.
iron or other metal is poured in, so as to fill the remaining space and form the
flap B, and as the metal cools it will contract sufficiently to enable the flaps
A and B to work freely on the projecting cones or axes b, b, on the flap B.
Figure 4 is a plan, and Figure 5 a longitudinal section, of a butt hinge,
made according to my Invention. C is the flap which is first cast; it has two
projections c, c, on which are the cones c¹, c', which differ from the cones of
the flap A of the hinge previously described, in being raised in place of being
depressed, but this may be varied. The flap C is placed in a suitable mould,
and the flap D cast thereon, as has been already described with reference to
the other Figures of the Drawing.
In witness whereof, I, the said Francis William Gerish, have hereunto
set my hand and seal, this First day of July, in the year of our Lord
One thousand eight hundred and fifty-six.
Witness,
S. CARPMAEL.
F. W. GERISH.
(L.S.)