IMPROVEMENTS IN CORRUGATED METAL REVOLVING SHUTTERS
Year: 1872

page_text: LETTERS PATENT to Alexander Clark, of Rathbone Place, in the
County of Middlesex, Engineer and Revolving Shutter Manufac-.
turer, for the Invention of "IMPROVEMENTS IN CORRUGATED METAL
REVOLVING SHUTTERS."
Sealed the 27th August 1872, and dated the 2nd May 1872.
PROVISIONAL SPECIFICATION left by the said Alexander Olark at the
Office of the Commissioners of Patents, with his Petition, on the
2nd May 1872.
I, ALEXANDER CLARK, of Rathbone Place, in the County of Middlesex,
Engineer and Revolving Shutter Manufacturer, do hereby declare the
nature of the said Invention for "IMPROVEMENTS IN CORRUGATED METAL
REVOLVING SHUTTERS," to be as follows:-
The object of my Invention is to deaden or prevent noise in raising
and lowering corrugated metal revolving shutters, such as those for
which Letters Patent were granted to me bearing date February 8th
1859, No. 357. For this purpose I apply one or more strips of soft or
pliant material, such as leather, webbing, rope, sheet india-rubber, or?

page_text: india-rubber tubing at the back of the shutter, so that the soft material
will intervené as a cushion between the successive convolutions of the
metal shutter when the latter is coiled up, and thus prevent the noise
produced by the corrugations catching and slipping over one another
when the shutter is being coiled or uncoiled. The strip or strips of
pliant material may be attached to the shutter at top and bottom, or at
the upper end only. In the latter case, when the shutter is unwound
the strip or strips would either hang behind the shutter or they would be
wound on a barrel provided for the purpose near the upper part of the
shutter.
Instead of the strips before mentioned I may apply a sheet of the
material as a lining to the back of the shutter with the same object.
The same result may be attained by gradually increasing the width of
the corrugations in the shutter towards the bottom, so that when wound
up the corrugations in one convolution will coincide with and fit upon or
receive those of the preceding convolution, that is to say, the size of the
corrugations must be so graduated that there will be the same number of
corrugations in the outer coils, whose circumference is largest, as in the
inner and smaller coils, in order that the shutter may coil and uncoil
evenly without slipping, and as the corrugations fit one in the other the
shutter will occupy less room when coiled.
I
.
may also line the grooves in which the shutter works with leather,
or I may apply a strip of wood within the grooves as a filling, which is
pressed against the back of the shutter near the edges by small springs
to prevent the noise or rattling of the shutter when being raised or
lowered.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Alexander Clark in the Great Seal Patent Office
on the 2nd November 1872.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, ALEXANDER 30
CLARK, of Rathbone Place, in the County of Middlesex, Engineer and
Revolving Shutter Manufacturer, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Second day of May, in the year of our
"

page_text: c
Lord One thousand cight hundred and seventy-two, in the thirty-fifth
year of Her reign, did, for Herself, Her heirs and successors, give
and grant unto me, the said Alexander Clark, Her special licence that I,
the said Alexander Clark, my executors, administrators, and assigns, or
5 such others as I, the said Alexander Clark, 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 CORRUGATED METAL
REVOLVING SHUTTERS," upon the condition (amongst others) that I, the
said Alexander Clark, my executors or administrators, 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 Alexander Clark, do hereby declaro
the nature of my said Invention, and in what manner the same is to be
performed, to be particularly described and ascertained in and by the
following statement, reference being had to the Sheet of Drawings here-
unto annexed, and to the letters and figures marked thereon (that is to
say):
The object of my Invention is to deaden or prevent noise in raising
and lowering corrugated metal revolving shutters, such as those for
which Letters Patent were granted to me bearing date February 8th,
1859, No. 357. For this purpose I apply one or more strips of soft or
pliant material, such as leather, webbing, rope, india-rubber, or india-
rubber tubing, at the back of the shutter, so that the soft material will
intervene as a cushion between the successive convolutions of the metal
shutter when the latter is coiled up, and thus prevent the noise produced
by the corrugations catching and slipping over one another when the
shutter is being coiled or uncoiled. The strip or strips of pliant material
may be attached to the shutter at top and bottom, or at the upper end
only. In the latter case when the shutter is unwound the strip or strips
would either hang behind the shutter or they would be wound on a
barral provided for the purpose near the coiled part of the shutter.

page_text: Instead of the strips before mentioned I may apply a sheet of the
material as a lining to the back of the shutter with the same object.
My Invention also consists in gradually increasing the width of the
corrugations in the shutter towards the bottom, so that when wound up
the corrugations in one convolution will coincide with and fit upon or
receive those of the preceding convolution, that is to say, the size of the
corrugations must be so graduated that there will be the same number of
corrugations in the outer coils, whose circumference is largest, as in the
inner and smaller coils, in order that the shutter may coil and uncoil
evenly without slipping, and as the corrugations fit one in the other the
shutter will occupy less room when coiled, which is a very great advantage.
I
may also line the grooves in which the shutter works with leather,
or I may apply a strip of wood within the grooves as a filling, which is
pressed against the back of the shutter near the edges by small springs
to prevent the noise or rattling of the shutter when being raised or

page_text: so much of the sheet as will form the innermost convolution 1 when
coiled up being corrugated with one pair of dies, another and slightly
larger pair of dies being used to form corrugations for the next con..
volution 2, and so on, a different pair of dies being used for each successive
coil 3, 4, 5, 6, so that when coiled up the corrugations will fit in one
another, there being the same number of corrugations in all the coils.
'
G
Another and better method of corrugating the shutter is by the use
of the apparatus forming the subject of my application for Letters
Patent, No. 3206, dated November 1st 1872, and which I do not-there-
fore claim under the present Patent, D, Figure 3, is a hollow cylinder
of the same width as the sheet to be corrugated, open at one side, and
forming a curved continuation of a table E. Within said cylinder
revolves a corrugated cylinder F. G is a series of bars or dies laid sidė
by side to corrugate the shutter. A continuous sheet of metal to form
the shutter is placed on the dies, and the edge of the sheet with the first
die are so placed as to be gripped by the cylinder F, and the two are
drawn in together between cylinder F and the outside frame D, as shown;
the dies, which are fed in successively as each corrugation of the cylinder
passes the opening, forcing the sheet metal into the corrugations of said
cylinder F. The dies are carried round by the rotation of cylinder F,
and pass out at the opening D³, the shutter being wound on the
cylinder F until the whole shutter is corrugated. In this manner the
first coil serves to form the next, which in turn determines the form of
the corrugations in the succeeding coil, and so on. The dies must be in
sets (one set for each coil) of decreasing thickness, as the space within
the curved frame D becomes lessened each time a fresh coil is added.
In this manner the shutter is coiled into the precise form it is intended
to take when fitted.
In whichever way the shutter is made I prefer to make the spring
> barrels on which it is fitted to coil with corrugations on their periphery
corresponding to the corrugations of the first or inner coil, so as to
ensure the shutter always coiling in the same manner when fitted.
The improvement before described, and constituting the first part of
my Invention, may also be applied in this case to prevent noise if
necessary.
Figures 4 and 5 illustrate the third part of my Invention, which has
also for its object the prevention of the noise made by the rattling of a
corrugated metal shutter in its grooves.

page_text: <
Figure 4 shows a groove, and Figure 5 a cross section of same. c' is
the metal groove drawn in the usual manner of the form shown, and of
rather greater width than usual to admit of a strip of wood or leather d
being placed therein with small springs e behind it to press it against
the shutter and prevent the noise caused when the latter works loose 5
in the grooves.
Having described the nature of my Invention, and in what manner
the same is to be performed, I declare that what I claim as my
Invention to be protected by the herein-before in part recited Letters
Patent, is,―
1st. The application to corrugated metal revolving shutters of a strip
or strips or backing of soft and pliant material to act as a cushion between
the coils of the shutter, substantially as and for the purpose described.
1
2ndly. The manufacture of corrugated metal revolving shutters with
corrugations of varying dimensions, so that when coiled the corrugations 1
of the several coils will coincide with and fit on one another, substan-
tially as and for the purpose herein-before described and shown in
Figure 2 of the Drawings.
3rdly. Lining the grooves of the said shutters with a strip of wood or
other suitable material provided with springs, substantially as and for 2
the purpose specified.
Figure 2 of the Drawings.
3rdly. Lining the grooves of the said shutters with a strip of wood or
other suitable material provided with springs, substantially as and for 20
the purpose specified.
In witness whereof, I, the said Alexander Clark, have hereunto set
my hand and seal, this First day of November, in the year of
our Lord One thousand eight hundred and seventy-two.