IMPROVEMENTS IN FIRE- " RESISTING DOORS OR SHUTTERS
Year: 1883

page_text: LETTERS PATENT to Francis William Ernest Braid, of'5 Chancery Lane in the
County of Middlesex, Builder for an Invention of IMPROVEMENTS IN FIRE-
"
RESISTING DOORS OR SHUTTERS
"
.
.
PROVISIONAL SPECIFICATION left by the said Francis William Ernest
Braid at the Office of the Commissioners of Patents on the 25th July 1883.
FRANCIS WILLIAM ERNEST BRAID, of 5 Chancery Lane, in the County of
Middlesex, Builder, "IMPROVEMENTS IN FIRE-RESISTING DOORS OR SHUTTERS
دو
This Invention relates to improvements in Fire-resisting doors or shutters, and
consists in the use and application of Cotton slag covered on each side with
asbestos paper or other similar material to fire-resisting doors or shutters for the
purpose of checking and effectually stopping the spread of fire in a Warehouse or
other building.
The door or shutter may be made either wholly of wood, or with iron outside
casings, or of wood and iron combined, and may be hinged in stone, concrete, or
iron frames, or made to slide or be fitted in any suitable manner to an opening or
aperture in the wall of a Warehouse, Office, Dwelling house, or other building
This Invention may be applied to any kind of openings or entrances whatsoever,
whether doors, windows or otherwise, as a means of protection against fire

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Francis William Ernest Braid in the Patent Office on the
25th January 1884.
"
FRANCIS WILLIAM ERNEST BRAID of 5 Chancery Lane in the County of
Middlesex, Builder. "IMPROVEMENTS IN FIRE-RESISTING DOORS OR SHUTTERS
This Invention relates to improvements in fire resisting doors or shutters and
consists in the use and application of cotton or woollen slag enclosed in wirework
between the outer casings of such doors or shutters, immediate contact between
the slag and casings being prevented by a layer of paper or cloth composed of
asbestos
The outer casings of the doors or shutters may be formed either of wood or
iron, or the two materials may be used in combination, and may be hinged in
stone, concrete or iron framework or they may be constructed as sliding doors or
be fitted in any convenient manner to an opening or aperture in the wall of
warehouse, office, dwelling-house or other building
Doors, shutters, and other partitions constructed in accordance with my
Invention will effectually arrest the progress of fire from one part of a building
to another, as although the outer casing may become intensely heated or charred,
the density and non-conducting character of slag and asbestos will prevent further
decomposition
In order that my Invention may be more fully understood, I herein give
reference to the accompanying sheet of Drawings which illustrate one of the many
methods in which it may be applied.
Figure 1 represents a portion of the wall of a brick or stone building provided
with a doorway which is closed by the door A.
Figure 2 represents section of same.
The side of the door A shewn in Figure 1 is composed of deal framing, the
reverse side B being composed of sheet iron, the two sides being held together by
the angle iron frame F and plate G. Between the two sides of the door is a
partition of wirework D covered with a layer of asbestos B the space between the
asbestos and the iron back E being filled in with cotton or woollen slag C.
This door thus constructed is hinged to the iron framework H.
Doors thus constructed and fitted will resist the action of fire so effectually as
to prevent it from spreading from one room to another, as although the casing on
one side may be completely destroyed, that on the other side being protected by
the slag and asbestos, will remain uninjured
Having now described the nature of my Invention, and shewn by drawings one
mode of carrying the same into practice, I would have it understood that its
application is not confined merely to doors and shutters, as the principle of
construction may be extended to other parts of a building, vessel, or other structure,
for preventing the spread of fire from one compartment to another.
In Witness whereof I the said Francis William Ernest Braid have hereunto set
my hand and seal this 17th day of December in the year of our Lord One thousand
eight hundred and eighty three.
'
FRANCIS, WILLIAM, ERNEST, BRAID. (L.S.)