Improved Means for Opening the Doors of Steam Boiler and other Furnaces.
Year: 1889

page_text: Complete Specification Left, 7th Aug., 1889-Accepted, 17th Jan., 1990
COMPLETE SPECIFICATION.
Improved Means for Opening the Doors of Steam Boiler and other
Furnaces.
I, EDWARD BARRETT, of 82 Cherry Street, Merchant, Fall River in the County
of Bristol, Massachusetts, United States of America, 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 :-
The invention relates to means whereby the doors of boiler-furnaces may be
simultaneously opened when it becomes necessary to damp the fires; and it consists
in certain novel features, as hereinafter fully set forth, the object being to produce
a simpler, cheaper, and more effective device of this character than is now in
ordinary use.
The nature and operation of the improvement will be readily understood by all
conversant with such matters from the following explanation.
In the accompanying drawing
Figure 1 is a front elevation of a boiler furnace provided with my improvement.
Figure 2 is a plan view, the body of the furnace being broken away; and
Figures 3, 4 and 5 show enlarged sectional views illustrating certain details of
construction.
Like letters and figures of reference indicate corresponding parts in the different
figures of the drawings.
A represents the furnace front, and BC the doors. The doors are fastened by
latches in the usual manner, the doors BC of each set opening outward in opposite
directions. Two parallel horizontally-arranged rods d fare disposed above the doors,
said rods being supported by and fitted to slide longitudinally between rolls y, (see
Figure 5) journalled in brackets h, which are secured at suitable intervals to the
furnace-front. The rods d, f, are connected at one end by a chain i, which passes
over a pulley k, journalled on the furnace-front. To the outer end of each latch b
on the doors B is secured a chain m, the opposite ends of said chains being secured
to the rod d at points at the rear of the vertical line of the door-hinges. Similarly-
disposed chains connect the latches of the doors C with the rod at points in the
vertical line of the door-hinges, sufficient length of chain mp being thus supplied to
allow a single door to be opened in the usual manner without moving said rods d f.
Two vertically-arranged land levers are pivoted by their lower ends to the
furnace-front at the side opposite the pulley k, the upper ends of said levers working
in a guide-bracket D. The lever r is pivoted at v to the end of the rod d, and the
lever tat e to the corresponding end of the rod. The rods df as disposed in the
brackets are outside the plane of the doors B C, as shown in Figure 2.
In the use of our improvement to open the doors of the furnace the lever is
drawn outward into the position of levert in Figure 1. This causes the rod d to
move from right to left and the rod f from left to right, as view in Figure 1. The
chains mp, secured to said rods, unlatch the doors as the rods are thus moved and
swing them open in opposite directions in a manner that will be readily understood
without a more explicit description. In moving the rods to open the door as
described the lever is moved into the position of lever in Figure 1, and to close

page_text: the doors again said levert is again forced outward, causing the rods to move back
into their original position.
It will be seen that by the use of my device the furnace-doors can be quickly
and easily opened when it becomes necessary from any cause to suddenly damp the
fires and stop steam from generating. It will be understood that one rod only, as d,
is employed when the doors B C open in the same direction.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed we declare that what we
claim is
First. A device for opening furnace-doors, consisting of a rod arranged to slide
on the furnace-front and connected with said doors by cords or chains, substantially
as described.
Second. In a device of the character described, the combination of a rod fitted
to slide on the furnace-front in the direction the furnace-door swings, with a chain
connecting the rod with the door-latch, and a lever for actuating said rod, substantially
as described.
Third. In a device of the character described, the combination of a furnace, a rod
fitted to slide in guide-rolls on the front thereof, a chain connecting the door-latch
with said rod at a point opposite the centre thereof, and a lever pivoted to said rod
and the furnace-front, substantially as and for the purpose set forth.
Fourth. In a device of the character described, the combination of a furnace
provided with doors opening in opposite directions, two rods fitted to slide in the
furnace-front and having their corresponding ends connected by a chain passing
over a fixed pulley, chains connecting the latches of doors opening in like directions
with one of said rods, and an actuating-lever for each rod, whereby the doors may
be opened or closed as said rods are moved, substantially as described.
Fifth. The furnace A, provided with doors B, having latches b, in combination
with the rod d, fitted to slide between rolls g, on the furnace front, the chains m,
connecting said latches and rod, and the lever r, for actuating said rod, substantially
as described.
Sixth. The furnace A provided with doors B C, having latches b, in combination
with the rods df, fitted to slide between rolls g. on the furnace-front, the chains m p,
connecting said latches and rods, the chain and pulley k, and the levers rt all
being arranged to operate substantially as described.
Dated this 7th day of August 1889
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, Agents for the Applicant.