IMPROVEMENTS IN STOVE GEATEE
Year: 1857

page_text: LETTERS PATENT to Henry Elliott Hoole, of the Green Lane Works
Sheffield, in the County of York, Stove Grate and Fender Manufacturer,
for the Invention of "IMPROVEMENTS IN STOVE GEATEE."
Sealed the 7th August 1857, and dated the 5th May 1857.
PROVISIONAL SPECIFICATION left by the said Henry Elliott Hoole at
the Office of the Commissioners of Patents, with his Petition, on the
5th May 1857.
I, HENRY ELLIOTT HOOLE, of the Green Lane Works, Sheffield, in the
County of York, Stove Grate and Fender Manufacturer, do hereby declaro
the nature of the said Invention for "IMPROVEMENTS IN STOVE GRATES," to be
as follows:-
My Invention of improvements in stove grates relates principally to various
improvements upon an Invention, for which I have already obtained Letters
Patent bearing date January 22nd, 1856. Some of these improvements aro
also applicable to stoves or stove grates of other and the ordinary kinds of con-
struction.
The first part of my Invention relates to that description of stove grate in
which the fuel is supplied from a coal box below the fire, and is raised up to
the fire bars as the upper part of the fuel burns away.
The improvement consists in making the coal box removeable, so that it
may be detached from the stove grate and taken away when required. The
improved stove is formed in two principal parts, the back, which forms a

page_text: recess with parallel sides, and the box containing the apparatus for raising
the coal. The box is made exactly to fit the recess of the back of the stove,
and when placed in situ is immoveable either in a backward or in a lateral
direction. When adapted to the grate, the coal box may be secured in its
place, either by screws or other convenient means, which firmly secure it to
the fixed or stationary part of the grate, but will at the same time admit of its
being easily detached. The bottom plate of the coal box is also made moveable,
and is fitted in grooves made in the side plates of the box, so that it may be
drawn out, in order to allow any ashes or cinders that may accumulate thereon
'to fall into the ashes pan below.
Another improvement in the coal box relates to the means of raising tho
moveable coal plate. This has usually been done by means of mechanism
placed above; but as it is frequently inconvenient to place the gearing in this
part of the grate, I propose to move the coal plate by means of a vertical
screw adapted to about the centre part of the coal plate. The vertical screw
may either be made to work in a female screw tapped in the moveable coal
plate, or it may be fixed to the under side of the coal plate, and made to work
in a female screw on the rotating circular plate disc or rim. This plate disc
or rim, whether attached to the vertical screw, or provided with a boss and
female screw to receive the male screw, is perforated at. its edges, and a por-
tion of this disc or circular plate may be made to project beyond the grate,
and being provided with holes near its circumference, it may be rotated by
inserting the end of the poker into one of the holes, and using it as a lever to
move round the plate or disc. By thus rotating the circular plate or disc on
the elevating screw, or causing the latter to rotate in the boss of the coal
plate, the latter will be elevated, and the coal or fuel thereon will be raised in
-the coal box. In order to prevent the friction of the moveable coal plate of
the box against the sides of the latter, while the coal plate is being raised, I
provide the moveable coal plate at each end or corner with antifriction wheels
or rollers, and I place at the corners of the box vertical guide bars or surfaces,
against which the antifriction wheels of the coal plate will travel, and by this
means prevent the coal plate from touching or rubbing against the sides of the
box at any part.
I find it convenient to make the upper and open end of the coal box
trumpet-mouthed, and behind it I place an inclined piece or pieces, on to which
any ashes or cinders that may fall over the back of the box will fall and-be
conducted to the ash pit below.
The next improvement relates to the valve through which the gascous
products of combustion pass from the fire or grate to the flue or chinney.

page_text: The construction of valve which I prefer to use in connection with my other
improvements, but which may also be applied to other constructions of stove
grates, is a flap valve placed in an upright position and hinged at or near its
base. This valve is opened or shut by means of a screw placed in a horizontal
position in suitable bearings, connected with an external knob or handle at
the front of the stove. A screw nut, made in a horizontal bar, works on the
screw, and the bar is provided with arms on each side, from which extend rods
that connect them to the sides of the valve near to its axis, in such a manner
as to cause the valve to be opened or shut by one rotation of the screw, and
consequently of the knob in the front of the stove.
In addition to the side rods being fastened to the axis of the valve, the
screw has a pitch of about 2 inches, and as the valve can be opened or shut
by turning the knob only once or partly round, an index can be placed in the
front of the stove to indicate the position of the valve, and whether it is open
or shut. The fastenings of the rods to the valve being at the extreme sides
of the valve, the chimney when the valve is open can be swept without any
difficulty.
A very simple construction of valve can be produced by mounting a throttle
valve on a horizontal spindle, one end of which projects through the front
plate of the stove, and is provided with a knob or handle to turn the same.
In order to make the valve stand in any desired position, according to the
amount of draught required, a spring is adapted to and made to bear on the
spindle or rod of the valve and prevent the same from turning, except when
moved by the hand. The valve is fixed on its spindle by means of a screw or
other convenient contrivance, and, if required, an index plate and pointer may
be adapted to the forward end of the spindle, for the purpose of indicating the
position of the valve
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said Henry Elliott Hoole in the Great Seal Patent Office on
the 5th November 1857.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, HENRY
ELLIOTT HOOLE, of the Green Lane Works, Sheffield, in the County of York,
Stove Grate and Fender Manufacturer, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters.
Patent, bearing date the Fifth day of May, in the year of our Lord One
thousand eight hundred and fifty-seven, in the twentieth year of Her reign,

page_text: did, for Herself, Her heirs and successors, give and grant unto me, the
said Henry Elliott Hoole, Her special license that I, the said Henry Elliott
Hoole, my executors, administrators, and assigns, or such others as I, the
said Henry Elliott Hoole, 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 "IMPROVE-
'MENTS IN STOVE GRATES," upon the condition (amongst others) that I, the
said Henry Elliott Hoole, by an instrument in writing under my hand and scal,
should particularly describe and ascertain the nature of the said Invention, and
in what manner the same was to be performed, and cause the samo to be filed
in the Great Seal Patent Office within six calendar months next and imme-
diately after the date of the said Letters Patent.
NOW KNOW YE, that I, the said Henry Elliott Hoole, do hereby
declare 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 Drawings hereunto annexed,
and to the letters and figures marked thereon (that is to say):-
My Invention of "Improvements in Stove Grates" relates principally to
various improvements upon an Invention, for which I have already obtained
Letters Patent, bearing date the Twenty-second day of January, One thousand
eight hundred and fifty-six. Some of these improvements are also applicable
to stoves or stove grates of other and the ordinary kinds of construction.
In order that the several improvements may be clearly understood, I have
shewn in the accompanying Drawings various views of stoves and stove grates
constructed according to my present improvements, or having the improved
parts adapted thereto.
The first part of my Invention relates to that description of stove grate in
which the fuel is supplied from a coal box below the fire, and is raised up to 3
the fire bars as the upper part of the fuol burns away.
This improvement is shown in Figures 1, 2, 3, 4, and 5 of the accompanying
Drawings, and consists in making the coal box removeable, so that it may
be dotached from the stove grate and taken away when required. Fig. 1 is
a front view of the stove grate complete; Fig. 2 is an elevation of the interior S
of the stove, with the coal box and front plate removed; Fig. 3 is another
view of the interior, with the coal box in its place; Fig. 4 is a transverse
vertical section of the stove; Fig. 5 is a horizontal sectional view; and Fig. 6
is another sectional or plan view. The improved stove is made in two

page_text: principal parts. The back a forms a recess with parallel sides b, b, in which
is placed the box c, containing the apparatus for raising the coal. The coal
box is made exactly to fit the recess of the back of the stove, as shewn in
Figures 5 and 6, and when placed in situ is immoveable either in a backward
or in a lateral direction. When adapted to the grate the coal box c must be
secured in its place either by screws d, d, (Fig. 1), or in any other convenient
manner, which will firmly secure it to the fixed or stationary part e of the
grate, but will at the same time admit of its being easily detached upon
removing the above-mentioned temporary fastenings. The bottom plate of
the coal box may in some cases be made removable, and is fitted in grooves
made in the side plates 6 of the coal box, as shewn in the detached view,
Fig. 9, so that it may be drawn out, in order to allow any ashes or cinders
that may accumulate thereon to fall into the ash pan or other receptacle
below; but in such cases a different mode of raising the coal plate f must
be adopted.
Another improvement in the coal box relates to the means of raising the
moveable coal plate f, which supports the coal or fuel in the coal box. This
has usually been done by means of mechanism placed above; but as it is
frequently inconvenient to place the gearing in this part of the grate, I propose
to move the coal plate f by means of the vertical screw 9, which is adapted
to about the centre part of the coal plate, as seen in Figures 8 and 10. Tho
vertical screw 9 may either be made to work in a female screw tapped in the
moveable coal plate f, as shewn in Figures 4 and 8; or it may be attached
to the under side of the coal plate, as seen in Fig. 10, in which latter case
it is made to work up and down in a female screw on the rotating circular
plate disc or rim h. This plate disc or rim h, whether attached to the
vertical screw g. or provided with a boss and female screw to receive the malo
screw, is perforated at its edges, as seen in Figures 1, 4, 5, 7, and 8; and a
portion of this disc or circular plate is made to project beyond the grate,
as seen in the sectional plan view, Fig. 7, and being provided with holes
near its circumference it may be rotated by inserting the end of the poker
into one of the holes, and using it as a lever to move round the plate or
disc. By thus rotating the circular plate or disc h on the elevating screw g.
or causing the latter to rotate in the boss of the coal plate f, the latter will
be elevated, and the coal or fuel theroon will be raised in the coal box c. In
order to prevent the friction of the moveable coal plate fof the box c against
the sides of the latter while the coal plate is being raised, I provide the
moveable coal plate fat each end or corner with antifriction wheels or rollers
i, i, Figures 4 and 8, and I place at the corners of the box vertical guida

page_text: bars or surfaces j. Figures 4, 5, 6, and. 8, against which these antifriction
wheels or rollers i, i, of the coal plate will travel. By this means the coal
plate is prevented from touching or rubbing against the sides of the box at
any part, and therefore little or no friction will be produced by the plate f
in rising or descending.
I find it convenient to make the upper and open end of the coal box c
trumpet-mouthed, as shewn in Figures 4, 8, and 9, and behind it I place an
inclined piece or pieces k, k, seen best in Fig. 2, on to which any ashes or
cinders that may fall over the back of the box will fall and be conducted to
the ash pit below..
The next improvement relates to the construction and mode of operating
the valve, through which the gaseous products of combustion pass from the
fire or grate to the flue or chimney. The form and mode of working the
valve admits of very considerable variations, but the construction of valve
which I prefer to use in connexion with my other improvements, and which
may also be applied to other constructions of stove grates, is a kind of flap
valve placed in an upright or nearly upright position, and hinged or otherwise
supported at or near its base, as shown at Fig. 4, and also in plan and sectional
elevation at Figures 11 and 12. This valve is opened or shut by means of a
screw m, placed in a horizontal position in suitable bearings and provided with
an external knob or handle at the front of the stove, as shewn at m* in the
Figures. This screw m passes through and works in a screw nut made in a
horizontal cross bar / which is provided at each end with arms or rods n, n,
which, by means of hooks or links, connect the bar to the sides of the valve o.
This connection is made near to the axis of the valve o so as to cause the
latter to be opened or shut by one rotation of the screw m, and consequently
of the knob in the front of the stovo.
In order to facilitate this operation, the screw m has a pitch of about two
and a quarter inches, and as the valve can be opened or shut by turning the
knob m only once or partly round, an index can be placed in the front of the
stove, as at. p, Fig. 1, to indicate tho position of the valve, and whether it is
open or shut. The fastenings of the rods to the valve being at the extremo
sides of the valve, the chimney when the valve is open can be swept without
any difficulty.
In Figures 13 and 14, I have shewn plan and sectional views of a modifi-
cation of the above, my present improved mode of working the valve being
applied to the double register valve, for which I have already obtained Letters
Patent as aforesaid. o is the moveable part of the register, and is equivalent
to the valve o of Figures 11 and 12. *is the stationary part of the register;

page_text: m is the screw, as in the former instance; is the cross bar, with the female
screw in its boss; n, n, are the side rods for working the valve, but instead of
being attached thereto, as in Figures 4, 11, and 12, they are jointed to the
upper end of the vertical lever n*, the lower end of which catches under
the top edge of the moveable piece o, and therefore when the upper end of
the lever n-is drawn forward by the screw m, the lower end thereof will-
throw back the moveable piece o and open the register. When required, the
lever n may be moved forward so as not to touch the register o and o*, and
then these latter parts may be removed altogether, as will be necessary when
the chimney requires sweeping.
A very simple construction of valve can be produced by mounting a throttle
valve on a horizontal spindle, one end of which projects through the front
plate of the stove, and is provided with a knob or handle to turn the same..
This construction of valve is shewn in the sectional view, Figures 15 and 16...
In order to make the valvo stand in any desired position, according to the
amount of draught required, a spring r is adapted to and made to bear on the
spindle or rods of the valve o, in order to prevent the same from turning,
except when moved by the hand. The valve o is fixed on its spindle s by
means of a screw t or other convenient contrivance, and if required, an index.
plate and pointer may be adapted to the forward end of the spindle, as shown.
at p. Fig. 1, for the purpose of indicating the position of the valve.
It will be evident that my several improvements, above described, may be
employed separately, and that tho valve o, Fig. 4, and the mode of operating
the same, may be adapted to stove grates of the ordinary well known con-
struction, as is shewn in Figures 11 and 12, already described.
When applying the valve in this manner, I raise the fire a considerable
height from the bearth, but in order to prevent the quick radiation of .heat
from the bottom of the fire, and which would cause an accumulation of ashes
on the bottom grate, and thereby cause the fire to burn dull,. I place lumps of
fire brick or any other non-conducting substance on the hearth, as shewn
at 2, 2.
The fire brick being a non-conductor of heat, the temperature
between the top of the brick and the bottom of the grate will always-bo suffi-
ciently high to, cause perfect combustion, and will prevent, the accumulation of
ashes, as is the case in very deep fires.
Having now described my Invention of "Improvements in Stove Grates,"
I would observe that, although I have (in the accompanying Drawings and
in the foregoing description) shewn and described the best means with which
I am acquainted for carrying my improvements into effect, I do not mean or
intend to confine myself rigidly thereto, as they may doubtless be varied in

page_text: some particulars without departing from the nature and object of my Inven-
tion; and although I have also described and shewn various parts that have
been heretofore known and in use, and some of which parts also form the
subject of Letters Patent formerly granted to me, I do not mean or intend to
claim such parts separately as forming part of the present Invention; but that
which I consider to be new in the above-described improvements, and there-
fore desire to claim as the Invention secured to me by Letters Patent as
aforesaid, is,―
. First, the use, as described, of a moveable coal box, and the application
thereto of a moveable bottom which may be drawn away when required, to let
the ashes fall into the ash pit or pan below.
Second, I claim the application to the coal plate of antifriction wheels,
rollers, or other equivalent contrivances for preventing or reducing the friction
of the coal plate against the sides of the box, and also the mode of raising or
lowering the said coal plate.
Third, I claim the mode or modes, herein set forth, of constructing, applying,
and operating the valve or valves for the purpose of regulating the draft of
the chimney or flue.
I also claim the mode, shewn in Figures 13 and 14, or any more modifica-
cation thereof, for regulating or working the compound register, for which I
have already obtained Letters Patent, as before mentioned.
In witness whereof, I, the said Henry Elliott Hoole, have hereunto set
my hand and seal, the Twenty-seventh day of October, in tho year of
our Lord One thousand eight hundred and fifty-seven.
Witness,
HENRY HOYLES,
213, Saint Philip's Road,
Sheffield.
HENKY E. HOOLE. (L.S.)