AN IMPROVEMENT IN THE BENDING OF SHEET IRON FOR THE MANUFACTURE OP CONICAL TUBES
Year: 1856

page_text: LETTERS PATENT to John Hamilton, junior, of Liverpool, for the Invention
of "AN IMPROVEMENT IN THE BENDING OF SHEET IRON FOR THE MANUFACTURE
OP CONICAL TUBES,"
Sealed the 9th January 1857, and dated the 18th July 1856.
PROVISIONAL SPECIFICATION left by the said John Hamilton at the
Office of the Commissioners of Patents, with his Petition, on the 18th July
1856.
I, JOHN HAMILTON, junior, of Liverpool, do hereby declare the nature of the
Invention for "AN IMPROVEMENT IN THE BENDING OF SHEET IRON FOR THE
MANUFACTURE OF CONICAL TUBES " to be as follows:-
This Invention has for its object an improvement in the bending of sheet
iron for the manufacture of conical tubes, and consists of employing conical
rollers, by preference of steel, of a length and diameter depending on the length
and diameter of the conical tubes. The sheet metal to be bent is passed
between conical rollers, and is bent around one of them; and by preference
such roller is supported on two other conical rollers.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said John Hamilton in the Great Seal Patent Office on the
17th January 1857.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JOHN
HAMILTON, junior, of Liverpool, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Eighteenth day of July, in the year of our Lord One
thousand eight hundred and fifty-six, in the twentieth year of Her reign,
did, for Herself, Her heirs and successors, give and grant unto me, the said
John Hamilton, Her special licence that I, the said John Hamilton, my
executors, administrators, and assigns, or such others as I, the said John
Hamilton, 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 "AN IMPROVEMENT IN THE BENDING
OF SHEET IRON FOR THE MANUFACTURE OF CONICAL TUBES," upon the condition.
(amongst others) that I, the said John Hamilton, my executors or adminis-
trators, by an instrument 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 John Hamilton, do hereby declare
the nature of the said Invention, and in what manner the same is to be per--
formed, 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 bending of sheet
iron for the manufacture of conical tubes, and consists of employing conical
rollers, by preference of steel, of a length and diameter depending on the length
and diameter of the conical tubes. The sheet metal to be bent is passed
between conical rollers, and is bent around one of these; and by preference
such roller is supported on two other conical rollers.
And in order that my said Invention may be most fully understood and
readily carried into effect, I will proceed to describe the Drawing hereunto
annexed.

page_text: * DESCRIPTION OF THE DRAWING.
Figure 1 is a side view, Figure 2 an end view, and Figure 3 a transverse
section of a machine arranged according to my said Invention for bending
sheet iron for the manufacture of conical tubes. A, B, and C are three conical
bending rollers, of which the two lower rollers A and B taper in one direction,
and the upper roller C in the opposite direction. They may be made of
steel, but when made of iron I have found in practice that they work very
well. These rollers are carried by suitable end frames, and are geared
together by pinions at both ends of the machine, the pinions on the roller C
driving the pinions on the rollers A and B. On the end of the roller C is also
a large spur wheel D, which is driven by the pinion E, which is turned directly
by a crank handle. F, F, are clamps to prevent the rollers springing apart;
they consist of curved bars of of iron, each carrying at their ends two brasses,
one of which presses on the rollers A and B, and the other on the upper
roller C. These brasses are capable of adjustment as to their distance apart
by means of a screw, and the end bearings of the roller C are capable of a
similar adjustment; thus the distance of this roller from the other two can
be to a considerable extent varied, so as to give more or less curl to the sheet
of iron.
The iron which I ordinarily use is about No. 15 of the guage, and it is cut
into pieces of the proper shape for producing the taper tube required; it is
then fed into the machine sideways between the rollers A and C, and then the
machine is driven until the sheet has passed between the rollers, and the end
of the sheet first fed in has then come against the clamp F at the point f. It
is then by band sprung off the roller C, and is removed at the end of the
machine. The tube is finished by driving on hoops, and rivetting it up by hand.
Tubes thus made are particularly applicable for telegraph and other posts, and
may be used for many other purposes.
In witness whereof, I, the said John Hamilton, have hereunto set my
hand and seal, this Seventeenth day of January, in the year of our
Lord One thousand eight hundred and fifty-seven.
Witness,
S. CARPMAEL.
JOHN HAMILTON, JU. (L.S.)