IMPROVEMENTS IN BOILER, FURNACE, AND OTHER DOORS
Year: 1876

page_text: LETTERS PATENT to James Jowett and Ellis Wood, both of Leeds, in the County.
of York, for the Invention of "IMPROVEMENTS IN BOILER, FURNACE, AND
OTHER DOORS."
Sealed the 9th February 1877, and dated the 17th August 1876.
PROVISIONAL SPECIFICATION left by the said James Jowett and Ellis
Wood at the Office of the Commissioners of Patents on the 17th August 1876.
JAMES JOWETT and ELLIS WOOD, both of Leeds, in the County of York. "IM-
PROVEMENTS IN BOILER, FURNACE, AND OTHER DOORS."
The object of our Invention is to regulate the movement of doors for the admis-
sion of air and other fluids.
We provide a door which hinges on its centro, and can either be placed in bear-
ings or worked on centre pins screwed into a support.
In a suitable position. with regard to the door we place a wheel, which may be
either larger or smaller in diameter than the breath of the door, and this wheel is
divided by a diaphragm or diaphragms, so that we can introduce certain quantitios
of mercury according to the time we desire the wheel to remain stationary. In one
of these diaphragms we insert a screwed plug having a hole through its centre,
which hole can be varied in size according to the requirements of the case; through
which hole it is intended for the mercury to percolate, so as to turn round the
wheel when its centre of gravity is overcome by the gradual accumulation of the
mercury on the side we wish to close. On the outside of this wheel we make
provision for turning the door nearly completely over by one movement, and half
closing the same by a reverse one, having it in a position to admit air or other
fluid for a given time, when the action of the mercury gradually brings the wheel
and the door back into their normal positions.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said James Jowett and Ellis Wood in the Great Seal Patent Office on
the 17th February 1877.
JAMES JOWETT and ELLIS WOOD, both of Leeds, in the County of York. "IM-
PROVEMENTS IN BOILER, FURNACE, AND OTHER DOORS."
1
j

page_text: The object of our Invention is to regulate the movement of doors for the ad-
mission of air and other fluids.
We provide a door which hinges on its centre, and can either be placed in bear-
ings or worked on centre pins screwed into a support.
In a suitable position with regard to the door we place a wheel, which may be
either larger or smaller in diameter than the breadth of the door, and this wheel is
divided by a diaphragın or diaphragins, so that we can introduce certain quantities
of mercury according to the time we desire the wheel to remain stationary. In
one of these diaphragms we insert a screwed plug having a hole through its centre,
which hole can be varied in size according to the requirements of the case, through
which hole it is intended for the mercury to percolate, so as to turn round the
wheel when its centry of gravity is overcome by the gradual accumulation of the
mercury on the side we wish to close. On the outside of this wheel we make
provision for turning the door nearly completely over by one movement, and half
closing the same by a reverse one, having it in a position to admit air or other fluid
for a given time, when the action of the mercury gradually brings the wheel and
the door back into their normal positions.
And in order that this Invention may be more completely understood, reference
is given to the accompanying Sheet of Drawings and to the letters and marks
DESCRIPTION OF DRAWINGS.
Figures 1, 2, and 3 represent the mercurial wheel, with the door attached, in
three different positions. Figure 4 is a transverse section of the same.
.
Figures 5, 6, and 7 are further modifications.
Figure 8 represents the application of our Invention to boilers.
Similar letters refer to corresponding parts in all the Figures.
A is a door for the admission of air or any other fluid. This door rests on the axes
B, which may be made in any suitable manner either with set screws (as shewn) or
merely resting in ordinary bearings. C is the mercurial wheel which is divided
internally by the diaphragms D and E, forming the chambers F and G, to which
wheel C motion is given by the hook H through the motor wheels I and J.
The action is as follows:-When the door A is in the position shewn at Figure 1
the aperture for the admission is closed, and the chamber F is occupied with the
requisite quantity of mercury or any other suitable material of fluid, such as oil,
water, or sand, but by moving the hook H to the position shown at Figure 2 the
mercury or its equivalent is ejected from the chamber F into the chamber G by the
motion of the wheel C, whilst at the same time the door A has closed or nearly
closed the aperture for the admission as shown. By moving the hook H back again
into the position shown at Figure 3 the mercury or its equivalent in the chamber
G can only return to the chamber F through the small aperture e at the base of
the diaphragm E, and the duration of the return will be dependant upon the
size of this aperture e, so that the door A will close according to the time occupied
by the mercury or its equivalent passing from one chamber to the other.
If the door A is required to close quickly this aperture e must be made larger
than when the door A is required to close more slowly.
Figures 5, 6, and 7 represent a different application of the same, the motion of
which is obtained by one motor wheel and link as shown. The movement of
the wheel C may be effected by other equivalent means.
Figure 8 shows the application of the Invention to a boiler for the purpose of
assisting in the consumption of smoke. K is the opening at the back of the bridge
through which air is admitted when required. The movement is imparted to the
book H by opening the furnace door, and conveyed thereto through the connecting
rod m and bracket n.
We would here remark that the wheel C, constructed as shown, may be placed in
any position relatively to the door which has to be closed, and that it may be

page_text: applied for the admission of any fluid which requires to be admitted or shut off
alternately.
Having now described the nature of our said Invention, and shown by Drawings
how the same may by carried into practice, we would have it understood that we
do not limit ourselves to the exact details or configuration of the various parts we
have explained and shewn, as the same may of course be varied or modified with-
out in any way departing from our Invention, but what we do claim and desire to
be secured to us by Letters Patent is the arrangement, construction, and applica-
tion of a wheel having internal diaphragms, substantially as shewn, by which the
action of the wheel, aided by mercury or its equivalent, is controlled, and auto.
matically closes a door attached thereto in any required time.
In witness whereof, I, the said James Jowett, for myself, and on behalf of the
said Ellis Wood, have hereunto set my hand and seal, this Fourteenth day
of February, in the year of our Lord One thousand eight hundred and
seventy-seven.
JAMES JOWETT. (L.S.)