Improvements in and relating to Fire Doors for Furnaces.
Year: 1893

page_text: Date of Application, 2nd Feb., 1893
Complete Specification Left. 31st Oct.. 1893-Accepted. 2nd Dec.. 1893
PROVISIONAL SPECIFICATION.
Improvements in and relating to Fire Doors for Furnaces.
I, DONALD BARNS MORISON of Hartlepool Engine Works, Hartlepool in the
County of Durham, Engineer do hereby declare the nature of this invention to be
as follows:--
My invention relates to the fire doors of boiler furnaces and especially to those
doors which are horizontally hinged and balanced. The object of my invention is
to prevent the undue accumulation of fuel near to the fire door, and for this purpose
I remove a portion of the dead plate behind the furnace door in such a manner
that the flap of the door is lengthened and when closed fills the beforo described
space in the dead plate.
That portion of the door filling the space in the dead plate may be attached to
or form part of the door and may be fitted with battles and perforated for the
admission of air to the furnace, the form of the door and also the furnace front
being suitably arranged for the purpose intended.
Dated this 1st day of February 1893.
COMPLETE SPECIFICATION.
Improvements in and relating to Fire Doors for Furnaces.
I, DONALD BARNS MORISON, of Hartlepool Engine Works, Hartlepool, in the
County of Durham, Engineer, do hereby declare the nature of this invention and
in what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement:—
My invention relates to the fire-loors of boiler furnaces and especially to those
doors which are horizontally hinged and balanced.
The object of my invention is to prevent the undue accumulation of fuel near to
the Gre-door and to give increased facilities for firing.
For this purpose
remove a portion of the dead plate behind the furnace door
in such a manner that the flap of the door is lengthenod aud when closed fills the
before described space in the dead plate. That portion of the door filling the
space in the dead plate may be attached to or form part of the door and may be
fitted with baffles and perforated for the admission of air to the furnace, the form
of the door and also the furnace front being suitably arranged for the purpose
intonded.
In horizontally hinged fire doors, which have hitherto been used, the fire door
frame has surrounded the fire door and the flap of the door when closed has either
rested against the bottom web of the frame or been kept in a corresponding position
by a suitable rack or catch.
In carrying out my invention 1 remove the bottom web of the fire door frame
and also a portion of the dead plate behind the furnace door extending the depth
of the flap and curving or projecting it inwards so that when closed it completely
Alls the recess.
In the accompanying drawings :
Figs. I. II & III show respectively in front elevation, horizontal section on
line, and vertical section on line y y a furnace front with horizontally hinged
balanced fire door constructed according to my invention.
Figs. IV. V & VI are corresponding views showing a furnace front with double

page_text: doors mounted and arranged in a similar manner to that shown in Figs. I. II
& III.
The same numbers are used to indicate corresponding parts in all the figuros.
I represents the furnace front plate fitted with ordinary internal bafflo
plates 2. 2.
3 is the dead plate in the front part of which is formed one or more recessos 4. 4
according to the number of fire doors with which the furnace front is provided.
5. 5 are the flaps of the furnace doors, arranged with baffles 6. 6, the lower parts
of which are lengthened and formed with an iowardly projecting horizontal
extension 7 which fits the corresponding space or recess 4 in the dead plate 3. The
lower inner edge of this extension 7 fits under the inner edge of the recess 4 as
shewn more clearly in the vertical sections Figs. III and VI, so that when the
door is shut the recess is effectually closed.
The arrangement of double doors as shewn in Figs. IV, V, VI may ndvan-
tageously be used for furnaces of large diameter.
It will be seen that by this construction of fire door it is practically impossible
for the fire men to leave a mass of burning fuel heaped up against the baffle plates.
Thus the burning away of the baffle plates attached to the doors and also those
attached to the inside of the furnace front is obviated and this being a frequent
source of expense it follows that a considerable economy will result from the
adoption of the construction herein before described.
The removal of the lower web of the fire door frame and the forming of the
recess in the dead plate also affords better facilities for efficient stoking than has
hitherto been obtainable.
The same method of construction may bo adopted for types of doors other than
those which have been described.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
"
I. Furnace fire doors arranged and operating substantially as described and
illustrated.
II. Horizontally hinged balanced fire doors mounted on a frame having a top
and two sides the frame being attached to a dead plate provided with a recess, the
flap of the door projecting inwards and of such depth that when closed the flap fills
the recess substantially as described and illustrated.
Dated this 30th day of October 1893.