An Improved Furnace Door for Steam Boilers.
Year: 1897

page_text: Date of Application, 4th Dec., 1897
Complete Specification Left, 1st Sept., 1898-Accepted, 15th Oct., 1898
PROVISIONAL SPECIFICATION.
An Improved Furnace Door for Steam Boilers.
LUKE RUSHWORTH, Mill House, 218, Edge Lane, Droylsden, Manchester,
Engineer, do hereby declare the nature of this invention to be as follows:-
In this invention the furnace door is made of sheet steel, & in the form of a
wing, or trap, hinged on the dead plate, & angled about 45° to furnace crown,
the door, opens inwardly & closes by spring, its action is as follows. In the
action of firing, the coals, coming in contact with the door force it open, &
the closing is performed with a spring. The object of this invention is to save
the time, lost in opening & closing the door by hand, & also to reduce the
admittance of cold air & thus save fuel.
Signed this 2nd day of December 1897
LUKE RUSHWORTH,
Edge Lane, Droylsden.
An Improved Furnace Door for Steam Boilers.
I, LUKE RUSHWORTH, of 218, Edge Lane, Droylsden, near Manchester, in the
County of Lancaster, 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 construction and application of furnace doors to
steam boilers to attain the following objects:-
To reduce the excess volume of cold air usually admitted through the furnace
doors in the operation of firing, and thereby minimise a too rapid cooling of
the furnace and flue plates.
Provide absolute conditions for a system of side firing, giving a consequent
reduction of dense smoke.
By the adoption of an automatic inclined furnace door or doors of pressed
steel or other suitable material, as herein described and illustrated, to obviate
the customary method of opening and closing such doors by hand.
Produce a more complete combustion of the fuel and gases in the furnace and
an increased generation of steam.
Give greater facilities for the removal of clinkers by the application of portable
inclined furnace doors as herein described and illustrated.
In conjunction with the two accompanying drawings, I more particularly
describe my invention and the manner of carrying the same out as follows:-
Price R71

page_text: Fig. 1 shows part front elevation of a Lancashire steam boiler, one flue fitted
with doors complete, and the other flue with doors removed, and Fig. 2 a longi-
tudinal section through the front portion of furnace or flue of same, illustrating
the application of my improved furnace door to this type of boiler.
The furnace front D, Figs. 1 and 2, is of the customary design, and provided
with a curved external mouthpiece D', and a rectangular internal termina-
tion D2, against the top of this mouthpiece D³, the inclined door or doors A
close, A shows dotted position of door when fully open inwards, as
on the
admission of fuel, B, and B' dotted, show positions of the hinge tail piece when
door is closed and open respectively, door A hinges on the ledge H of mouth-
piece D, C spring for closing door A,-fitted with adjusting nuts at the inner
end, and a combined hook and releasing handle at the hinge end, the point of
this hook is inserted into the indentations shown in Fig. 1, formed in the door
tail piece B, these indentations being placed at suitable distances to allow the
requisite freedom of action to the door for firing purposes, E spring bearer to
hold spring when not in operation, F ordinary dead plate, G fire bars.
The inward opening action of inclined door A is performed by coal or other
fuel thrown in contact with it in the act of firing, the door thereupon hinges
inward to the dotted position A Fig. 2, and admitting the fuel, when the door
again hinges back by the action of spring C, to its closed position A Fig. 2.
The rapid closing of the door thus after each feed of fuel, prevents the admis-
sion of cold air to the furnace and flues during firing.
To remove doors A from mouthpieces D1, D2, disconnect the hook point of
the spring C from the hinge tail piece B, and the doors are free to be withdrawn,
leaving the open mouthpiece for cleaning or other purposes, as shown on right
hand view of furnace Fig. 1. The adoption of two independent doors as shown,
compel the stoker to a system of side firing, as he can only force one door open
by each feed of fuel, under these conditions a more perfect state of combustion
is attained, consequently an enhanced generation of steam with an economic
consumption of fuel.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is:
t
1. The method, substantially as herein described and illustrated, of applying
an inclined, automatic, and removable fire door or doors, actuated by spring or
in other suitable manner, for the use of steam boilers,-to facilitate generation
of steam, aid more complete combustion, provide a means of more uniform
firing, decrease admission of cold air to furnace, and diminish dense smoke.
2. The construction, combination, and arrangement of the several parts for
the purposes mentioned herein.
Dated this 31st day of August 1808