IMPROVEMENTS IN GRATINGS FOR PROTECTING WINDOWS, DOORWAYS, AND OTHER APERTURES IN BUILDINGS
Year: 1873

page_text: LETTERS PATENT to John Henry Johnson, of 47, Lincoln's Inn Fields,
in the County of Middlesex, Gentleman, for the Invention of
“ IMPROVEMENTS IN GRATINGS FOR PROTECTING WINDOWS, DOORWAYS, AND
OTHER APERTURES IN BUILDINGS."-A communication from abroad by
Thaddeus Hyatt, of New York, in the United States of America.
PROVISIONAL SPECIFICATION left by the said John Henry Johnson
at the Office of the Commissioners of Patents, with his Petition,
on the 8th July 1873.
I, JOHN HENRY JOHNSON, of 47, Lincoln's Inn Fields, in the
5 County of Middlesex, Gentleman, do hereby declare the nature of the said
Invention for "IMPROVEMENTS IN GRATINGS FOR PROTECTING WINDOWS, DOOR-
WAYS, AND OTHER APERTURES IN BUILDINGS," a communication to me from
abroad by Thaddeus Hyatt, of New York, in the United States of
America, to be as follows :-

page_text: consists, as applied to a window, for example, of a grating composed of
two or more series of tubes, which slide into each other as do those of a
telescope. When slid within one another the whole may be out of sight
above the window, behind "the breastsummer," or they may form an
ornamental guard to the upper section of the window in front of it. A
wire guaze screen or curtain is or may be connected with the sliding
grating as a protection to the glass against accidental breakage from
stones or otherwise; the wire cloth is placed behind the sliding
grating, and may be rolled upon a roller or wheel at the top of the
window in the same way that ordinary revolving shutters are at present
wound up, the bottom of the wire curtain being fastened to the lowest
or bottom cross bar, to which the sliding tubes in the last section are
attached. When the sliding tubes are pulled down the gauze curtain
descends with them, and when the tubes are pushed up the curtain
also ascends, being self-wound upon the drum by the action of a coiled
spring.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said John Henry Johnson in the Great Seal Patent
Office on the 6th January 1874.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JOHN
HENRY JOHNSON, of 47, Lincoln's Inn Fields, in the County of
Middlesex, Gentleman, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Eighth day of July, in the year of our
Lord One thousand eight hundred and seventy-three, in the thirty-
seventh year of Her reign, did, for Herself, Her heirs and successors, give
and grant unto me, the said John Henry Johnson, Her special license
that I, the said John Henry Johnson, my executors, administrators, and
assigns, or such others as I, the said John Henry Johnson, my executors,
administrators, or 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 GRATINGS.

page_text: Drawings, the same letters of reference indicating corresponding parts
in both the Figures.
Figure 1 of my Drawings represents a front elevation partly in section
of my peculiar telescopic grating applied to a window; and Figure 2 is a
corresponding vertical section of the same.
A, A, represents the opening of a window; and B, B, is the telescopic
grating for protecting the same against burglars; C represents in red
lines in Figure 2 a sheet of wire gauze or netting, a portion only of
which is shewn in Figure 1. This gauze or netting is placed between
the said grating and the glass D (Figure 2) to protect the latter from
fracture by stones or otherwise. The grating is composed of several
rows or sets. of metal tubes a, each row or set of tubes sliding into the
set above, as shewn in the Drawing, and being secured at their lower
ends with cross bars b, which slide along them in suitable metal or other
guides at the sides of the window, each bar when pulled down resting on.
a supporting projection on the side guide. The top row or set of tubes
will be stationary, being built in the brick or stonowork, or otherwise
secured at the upper part of the window or doorway, or if desired this set
may be fixed at the bottom, and the other sets made to slide downwards
into them. The wire guaze O is secured to the bottom cross bar of the
lowest set of sliding tubes when opening by sliding upwards, and is
wound on to a drum E, being guided thereto by the guide rollers F, F.
The drum E may be rotated for the purpose of winding up the gauze
and opening the telescopic grating by a chain or rope c coiled on to the
end of the drum E, or on to a separate drum on the same axle, as shewn
in the Drawing, passing down to a windlass barrel G, worked by a winch
handle, but any other suitable mechanical arrangement may be applied
for winding up the gauze, and lifting the telescopic grating.
In Figure 1 I have shown the grating as being partly elevated; and in
Figure 2 it is shewn completely closed or drawn down, as illustrated also
by the red lines in Figure 1.
Having now described and particularly ascertained the nature of the
said Invention, and the manner in which the same is or may be used
or carried into effect, I would observe in conclusion that what I
consider to be novel and original and therefore claim as the Invention
secured to me by the herein-before in part recited Letters Patent is, the
construction and use of a telescopic sliding, grating, in combination or

page_text: not with a sheet of wire gauze or wire netting, substantially as and for
the purpose herein-before described and illustrated by my Drawings.
In witness whereof, I, the said John Henry Johnson, have to this
my Specification set my hand and seal, the Sixth day of
January, One thousand eight hundred and seventy-four.