IMPROVEMENTS IN THE CONSTRUCTION
Year: 1867

page_text: LETTERS PATENT to Thomas Redmayne, of Kilnhurst, Rotherham, in
the County of York, and John Sibrey, of the same Place, Stove Grate
Manufacturers, for the Invention of "IMPROVEMENTS IN THE CONSTRUCTION
Scaled the 4th October 1867, and dated the 9th April 1867.
PROVISIONAL SPECIFICATION left by the said Thomas Redmayne and
John Sibrey at the Office of the Commissioners of Patents, with their
Petition, on the 9th April 1867.
We, THOMAS REDMAYNE, of Kilnhurst, Rotherham, in the County of York,
and JOHN SIBREY, of the same Place, Stove Grate Manufacturers, do hereby
declare the nature of the said Invention for "IMPROVEMENTS IN
CONSTRUCTION OF REGISTER OR OTHER OPEN FIRE-GRATES," to be as follows:-
We propose to place under the lower bar or bottom grating of an ordinary
register or any open fire-grate a ventilator composed of vertical and
radiated ribs or bars corresponding with the openings at the bottom of the
grate; this is attached to a metal plate, which closes in the bottom of the
grate, the ventilator thus forming a box or drawer to travel on side pieces.
When it is desired to admit air under the bottom of the grate the vertical
bars or ribs are by means of a handle or knob made to slide from half to five-

page_text: eighths of an inch, so that they permit air to come through the front of the
drawer or box, such air passing up the openings at the bottom of the grate,
and so through the fuel, the front of the drawer being made in open work for
that purpose.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said Thomas Redmayne and John Sibrey in the Great Seal
Patent Office on the 7th October 1867.
TO ALL TO WHOM THESE PRESENTS SHALL COME, we, THOMAS
REDMAYNE, of Kilnburst, Rotherham, in the County of York, and JOHN
SIBREY, of the same Place, Stove Grate Manufacturers, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Ninth day of April, in the year of our Lord One
thousand eight hundred and sixty-seven, in the thirtieth year of Her reign,
did, for Herself, Her heirs and successors, give and grant unto us, the
said Thomas Redmayne and John Sibrey, Her special licence that we, the
said Thomas Redmayne and John Sibrey, our executors, administrators, and
assigns, or such others as we, the said Thomas Redmayne and John Sibrey, our
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 THE CON-
STRUCTION OF REGISTER OR OTHER OPEN FIRE-GRATES," upon the condition
(amongst others) that we, the said Thomas Redmayne and John Sibrey,
our executors or administrators, by an instrument in writing under our, or
one of our, 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 Sibrey, for myself and on behalf
of my co-patentee, do hereby declare the nature of our 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 Drawing hereunto annexed, and forming part of this our Specification,
and to the figures and letters of reference placed thereon:-

page_text: Our improvements in the construction of open fire-grates consist in
combining a ventilator and ash-box or pan, and in placing this combined
apparatus beneath the lower bar or bottom grate of a register or any ordinary
open fire-grate.
On the accompanying Sheet of Drawing, Fig. 1 is a front elevation of a
stove with our improvements applied; Fig. 2, a cross section at A, B, Fig. 1;
and Fig. 3 is an enlarged section of the ventilator and ash-pan at A, B, Fig. 1,
in order to shew the details more distinctly.
A, A, indicate the front of the box forming ash-pan with open work or
perforations a corresponding in number with the bars of the bottom grate a¹;
B (Fig. 2), the ash-pan, slightly drawn out from the stove; b, a perforated
slide set in the grooves c, c, of the front of the box; the vertical bars or
radiating ribs between the perforations of this slide 6 correspond with those d
of the front A, A, and are also equal in number to the number of radiating
bars or openings of the bottom grate a¹; e indicates a slot in which travels a
stud fixed to the slide b, and terminating in front in the knob f; g is the
bottom bar of the grate; and h, the plate on which the ventilating ash-box
slides in and out, or the box may slide on side pieces if preferred. When
it is desired to open the ventilator the knob f is passed to the right of the
slot e, as at Fig. 1, and air is thus permitted to be drawn through the
open work or perforations a of the front A, A, between the bars or
perforations of the slide b and through the openings of the bottom grate a¹
to the fuel, thereby increasing the combustion, so that a cheerful fire is
obtained in a very short time. By reversing the action of the knob f the
vertical ribs or bars of the slide h come partially or entirely over the
perforations a of the front A, A, thus closing or partly closing the ventilator,
and the combustion of the fuel in the grate will be diminished in relative
proportion to the increase or decrease in the supply of air through these
apertures; this ventilator may if desired be placed above any ordinary
ash-pan.
The advantages of our Invention are, that thereby a great saving of fuel
may be effected, as the combustion is regulated at pleasure, and also that a
clean hearth is always secured.
Our Invention may be applied to any register stove, sham register,
mantel sham, or any kitchen stove, and we would have it distinctly understood
that we do not limit ourselves to the use of any particular metal or material
in the manufacture and fitting of our combined ventilator and ash-pan, nor
do we confine ourselves to the precise details herein given and illustrated
on the Drawing, as the number of perforations might be increased or

page_text: diminished, the relative proportions be changed, and other modifications be
made without departing from the distinctive character of our Invention,
which we declare to be, and we claim, the combination of a ventilator
with an ash-box or pan placed beneath the lower bar or bottom grate of
an open fire-grate or stove for the purpose of regulating the combustion of
the fuel, and preserving the cleanliness of the hearth, substantially as herein-
before described and illustrated on the annexed Sheet of Drawing.
In witness whereof, I, the said John Sibrey, have hereunto set my hand
and seal, this Fifth day of October, in the year of our Lord One
thousand eight hundred and sixty-seven.
JOHN SIBREY. (L.S.)