Improvements in Furnace Doors for Locomotive or Stationary Boilers.
Year: 1897

page_text: Date of Application, 2nd Feb., 1897-Accepted, 5th June, 1897
COMPLETE SPECIFICATION.
Improvements in Furnace Doors for Locomotive or Stationary
Boilers.
1. FRANCIS LEROY HORSPOOL, of Ogden, in the County of Weber, and State
of Utah, United States of America, Gentleman, 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 :-
This invention relates generally to an improved door for steam boiler furnaces
and more particularly to one used in connection with a baffle or deflector plate.
The object of this invention is to provide a furnace door which will save time
and labor in firing a furnace and will also economise in the consumption of fuel
inasmuch as the door is made of sections capable of independent operation whereby
the door can be partially or wholly opened.
Another object is to provide a furnace door which when opened will lay flat out
of the fireman's way.
Another object is to construct a furnace door in combination with a baffle or
deflector plate which will prevent the cold air from coming in contact with the
crown sheet of the fire box or flues or tubes of the boiler.
Another object is to provide an improved locking means for securing the door
and a still further object is to provide a means for adjusting the deflector or baffle
plate.
With these various objects in view my invention consists in the peculiar
construction of the various parts and in their novel combination or arrangement of
parts all of which will be fully described hereinafter and then pointed out in the
claims.
In the drawings forming a part of this specification:
Figure 1 is a view showing the invention in place, the door being closed.
Figure 2 is a view showing the door in use partially open.
Figure 3 is a view showing the dour entirely open.
Figure 4 is a longitudinal section of the frout part of the fire box showing the
relative arrangement of the door and deflector or baffle plate.
In carrying out my invention I employ a suitable frame A, which is secured in
the opening of the fire box B; hinged to the bottom of said frame is a door C
said door comprising the upper section C, and the lower section C 2, said sections
being hinged together at C3. Locking levers are pivoted upon the outer face of
the lower section, one of said levers being bifurcated as shown at D' while the
opposite one has a head D 2, which enters the bifurcation D', thereby making a
connection between the two lovers so that when one is operated, the other will
be operated simultaneously in a similar direction. These levers project Interally
beyond the sides of the door and engage catches E attached to the door frame,
thereby securing the lower section of the door and the upper section is provided
with a suitable catch F, which engages the upper portion of the frame so that
the upper and lower portions can be locked when desired, and it will also be seen
that the upper section can be unlocked and turned down or open inlopendent of
the lower one.
The lower section or door has a metallic deflector plate G, said plate being angular
in shape and attached to the lower section of the door uear the upper edge thereof;
the other portion of said plate projecting downwardly and inwardly at the side
edges is bent upward as most clearly shown at G'.

page_text: The purpose of this plate is to prevent the lower section of the door from burning
out too rapidly and it also serves to check the draft and prevent the cold air getting
in contact with the water tubes of the boiler.
The deflector or baffle plate is rigidly attached to a transverse bar I which is
journaled in the door frame near the upper side and at one end said door is projected
outwardly a short distance and carries a lever arm K, through which passes a
set-screw L by means of which the deflector plate can be adjusted at any desired
angle.
The deflector or baffle plate is of a size substantially the same as the door opening
and normally rests in an inclined elevated position, the inner ends or corners of said
plate being bent downward as most clearly shown at H¹, in order to concentrate
the air or draft at the centre of the fire box. By means of this construction it is
clear that the cold air cannot pass directly to the crown sheet of the fire box or
the water tubes of the steam boiler inasmuch as the deflector plate will prevent
such action. It is also clear that by having the door made in the upper and lower
sections independently movable that the furnace can be fired without permitting
the entrance of a great amount of cold air and furthermore by having the door
to fold or open horizontally instead.of vertically as is commonly the case, it will be
out of the firemans way and thereby facilitate his operation.
Furthermore as the door is partially open all the time during firing the oponing and
closing of the door is avoided, and as the door is partially open while the engine is
working steam a sufficient amount of oxygen is admitted to consume the smoke and
gases, so that the black smoke which causes such waste is avoided. The baffle
plate also prevents the cold air coming in contact with the flues.
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 1
claim is
1. The combination with the door frame, of a door composed of an upper and
lower section hinged together substantially as shown and described.
2. The combination with the door frame, of the door hinged therein, said door
comprising the upper and lower sections hinged together, the lower section having
the locking levers and the upper section a locking catch, all arranged substantially
as shown and described.
3. The combination with the door frame, of the door hinged thereto and com-
prising the upper and lower sections hinged together, the locking levers pivoted
upon the lower section, the inner ends of said levers connecting with each other, the
catches carried upon the door frame and adapted to engage the outer ends of the
locking lever, and the locking catch arranged upon the upper section of the door,
substantially as shown and described.
4. The combination with the door frame,, of the door hinged thereto and the
adjustable deflector plate arranged upon the interior of the fire box and pivotally
connected with the door frame, substantially as shown and described.
5. The combination with the door frame, and door the deflector plate constructed
as described, of a door to which the deflector plate is attached and the adjusting
lever, a set-screw carried upon the end of said door, substantially as shown and
described..
6. The combination with the door frame and door, said door comprising the
upper and lower sections, the deflector plate, permanently attached to the inner
side of the lower section of the door, the adjustable deflector plate H attached
to a transverse bar journaled in the door frame, substantially as shown and
described.
с
1005
BOULT & WADE,
Agents for the Applicant.