IMPROVE- MENTS IN CORRUGATING, FLUTING, OR FASHIONING METAL SHEETS WITH IRREGULAR SURFACES
Year: 1864

page_text: LETTERS PATENT to Charles Pettit, of High Street, Hackney, in the
County of Middlesex, Mercantile Clerk, for the Invention of "IMPROVE-
MENTS IN CORRUGATING, FLUTING, OR FASHIONING METAL SHEETS WITH
IRREGULAR SURFACES."
Sealed the 4th April 1865, and dated the 18th October 1864.
PROVISIONAL SPECIFICATION left by the said Charles Pettit at the Offic:
of the Commissioners of Patents, with his Petition, on the 18th Octobe
1864.
I, CHARLES PETTIT, of High Street, Hackney, in the County of Middlesex
Mercantile Clerk, do hereby declare the nature of the said Invention for
"IMPROVEMENTS IN CORRUGATING, FLUTING, OR FASHIONING METAL SHEETS WITH
IRREGULAR SURFACES," to be as follows:-
My Invention of "Improvements in Corrugating, Fluting, or Fashioning
Metal Sheets with Irregular Surfaces," relates principally to a novel mode of
corrugating sheet iron, but it is also applicable to fashioning surfaces in other

page_text: irregular forms, such, for instance, as gutters, ridge, and round roll capping,
tiles of every description, and other articles made of metal with irregular
surfaces.
The Invention consists in the use of a consecutive series of revolving
circular fluted dies or rollers, the first pair of which will form the central
corrugations on the sheet, the second pair will form other corrugations on
each side of those just formed, and the third a further set of corrugations by
the side_of_the_second, and so on throughout the plate until the whole surface
of the sheet is corrugated, after which it may be placed under dies and
pressed, in order to give a good finish to the corrugations. In order to cause
the sheets to enter with facility between the circular dies the edge of the sheet
should be first prepared, by being slightly indented in a preparatory die, or in
any other convenient manner. It will be seen that by thus forming one or
two corrugations at a time the sheet will not be exposed to any undue strain,
nor will the fibres of the metal be forcibly torn asunder, and the corrugating
operation can be performed without the necessity of employing so much force
as heretofore, and therefore there will be less risk of breaking or deranging
the machinery.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said Charles Pettit in the Great Seal Patent Office on the 18th
April 1865.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, CHARLES
PETTIT, of High Street, Hackney, in the County of Middlesex, Mercantile
Clerk, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Eighteenth day of October, in the year of our Lord
One thousand eight hundred and sixty-four, in the twenty-eighth year of
Her reign, did, for Herself, Her heirs and successors, give and grant unto
me, the said Charles Pettit, Her special license that I, the said Charles
Pettit, my executors, administrators, and assigns, or such others as I, the said
Charles Pettit, 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 "IMPROVEMENTS IN

page_text: CORRUGATING, FLUTING, OR FASHIONING METAL SHEETS WITH IRREGULAR SURFACES,"
upon the condition (amongst others) that I, the said Charles Pettit, by an
instrument in writing under my hand and seal, 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 Charles Pettit, do hereby declare the
nature of my 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, reference being had to the Drawing hereunto annexed, and to
the letters and figures marked thereon (that is to say):
My Invention of "Improvements in Corrugating, Fluting, or Fashioning
Metal Sheets with Irregular Surfaces," relates principally to a novel mode of
corrugating sheet iron, but it is also applicable to fashioning metal surfaces in
other irregular forms, such for instance as gutters, ridge, and round roll
capping, tiles of every description, and other articles may also be made
of metal with irregular surfaces according to my Invention.
!
The Invention consists in the use of a consecutive series of revolving
circular fluted dies or rollers, the first pair of which will form the central
corrugations on the sheet, the second pair will form other complete .corru-
gations on each side of those just formed, and the third a further set of
complete corrugations by the side of the second, and so on in succession
throughout the plate until the whole surface of the sheet is corrugated, after
which it may be placed under parallel corrugated dies and pressed, in order
to give a good finish to the corrugations. In order to cause the sheets to
enter with facility between the cylindrical rotating dies, the edge of the sheet
should be first prepared by being slightly indented in a preparatory die, or in
any other convenient manner. It will be seen that by thus forming one or
two complete corrugations at a time the sheet will not be exposed to any
undue tensile strain, nor will the fibres of the metal be forcibly torn asunder,
the corrugating operation can therefore be performed without the necessity of
employing so much force as heretofore, and therefore there will be less risk of
breaking or deranging the machinery.
In the accompanying Drawing, Fig. 1 is a side elevation of a machine
suitable for effecting the object of my Invention. This machine consists of a
pair of guide rollers a, and five pairs of cylindrical rotating dies a¹, a², a³, a³, a³,
but any larger or smaller number of rotating dies may be employed. Fig. 2

page_text: is a front view of the guide rollers a, a, and Figures 3, 4, 5, 6, and 7, are
front views of the several cylindrical rotating dies a', a², a³, a¹ and a detached
from the machine, and shewing the increasing number of corrugations from
Fig. 3 to Fig. 7. The rollers a, shewn at Fig. 2, simply act as guide rollers
to carry in the sheet, which, when it passes to the cylindrical dies a¹ will
receive one set of complete corrugations, as shewn at Fig. 3. From thence
it passes to the dies a², and from them the sheet receives additional complete
corrugations, as shewn at Fig. 4. The sheet is conducted in succession
between the other rotating dies a³, a', and a³, and receives from them the
further complete corrugations, shewn at Figures 5, 6, and 7, after which, in
order to finish-it, the-corrugated-sheet may be pressed-between-parallel-dies,
as already mentioned.
Fig. 8 is a front view, and Fig. 9 a sectional view of a pair of rotating
corrugated dies for corrugating sheet-iron tiles, one of which is shewn in plan
and edge view at Figs. 10. It will be seen that the corrugations are made
complete in the tiles in succession as the sheet passes between the rotating
dies, and therefore no undue strain is put on the fibres of the metal to form
the successive complete corrugations.
Fig. 11 is a front view of a pair of rotating dies for commencing the
formation of a ridge cap; Fig. 12 is a similar view of another pair for com-
pleting the formation of the ridge cap. It will, however, be understood that
more than two pairs of dies may be required for completing the ridge cap; it
will not however be necessary to shew more than the two pairs represented in
Figures 11 and 12, as any person acquainted with the process of rolling metals
will clearly understand how to arrange a succession of dies, as shewn in
Figures 2 to 7.
Fig. 13 is a front view of a pair of dies arranged to roll metallic gutters,
one of which, partly finished, is shewn at Fig. 14, and the completed gutter is
shewn at Fig. 15. A series of rotating dies will also be required (as in the
other instances) to produce the complete gutter.
Various other forms and arrangements of corrugations may be made in the
manner already explained. I do not therefore mean to limit myself to any
precise form, nor do I intend to confine myself-to-the-particular-arrangement
of mechanism for effecting the object of my Invention; but what I claim as
the Invention secured to me by Letters Patent is, corrugating or fashioning
metallic surfaces in irregular forms, as herein shewn, by the use of rotating
dies, which will act in succession on the parts of the metallic surface or plate,
so as to prevent any undue strain being put on the fibres of the metal while

page_text: the complete corrugations are being produced in succession, as herein shewn
and described.
In witness whereof, I, the said Charles Pettit, have hereunto set my
hand and seal, the Seventeenth day of April, in the year of our
Lord One thousand eight hundred and sixty-five.
Witness,
J. W. MOFFATT,
66, Chancery Lane.
C. PETTIT. (L.S.)