Improved Means for Regulating the Generation of Heat in Ovens, Furnaces, and the like.
Year: 1890

page_text: Date of Application, 10th Feb., 1890-Accepted, 19th Apr., 1890
COMPLETE SPECIFICATION.
Improved Means for Regulating the Generation of Heat in Ovens,
Furnaces, and the like.
I, OSCAR BELLOT, of the Town of Gross Lichterfelde, near Berlin, Germany,
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 improved means for regulating the generation of heat in
ovens, furnaces and the like, such means consisting of a grate slide hereinafter
described. The grate slide is a hoof-like, hollow, where possible fire proof body of the
form or similar thereto as represented in the accompanying drawing, in which
Figure 1 is a sectional view in perspective.
Figure 2 an elevation,
Figure 3 a longitudinal section, and
Figure 4 a top view or plan of my improved slide.
The grate slide is pushed by means of the handle a, b, or in other appropriate
manner onto the grate, so far into the combustion chamber that only such portion of
the grate remains in the fire space and is covered with fuel, as is necessary to attain
the requisite effect. As is evident from the section, Figure 1, of a furnace hearth
with the grate half closed, the combustion chamber is divided by the slide into two
parts viz., the front space c from which the fuel has been ejected and through which
the air flows warming itself on the slide and the fire bars, and the combustion space d
in which non burning partially coking fuel lies on the slide, whilst intensely burning
fuel lies on the grate.
As represented by the arrows, the air flows from the front space c between the hot
firebars into the closed ash pit and ascends to the rear of the edge of the slide through
the spaces between the firebars into the combustion chamber or space d. The front
wall e, f, g, h, f, i, e, of the slide closes the furnace opening in such manner that the
air can enter through the three cornered opening k into the hollow space c formed
by the walls of the slide.
In order to promote the perfect combustion of the gases produced in the furnace by
mixing the same with warm or heated air, the front wall of the slide is provided with
openings, the size of which can be regulated by adjustable slides. If there is sufficient
space in the direction longitudinal to the firebars a front grate o, n, of lighter material
than the rear grate can be employed, so that when the slide is entirely or almost
entirely drawn from the combustion chamber, air conducting slots of sufficient size
will be left in the front space c. If, however, the space is small air must, as usual, be
admitted through the ash pit. If desired the grate slide can be made of several pieces
which can slide within each other like a telescope and be extended in like well known
manner.
By employing my improved grate it is rendered possible even in large furnaces to
generate only a small quantity of heat without decreasing the intensity of the com-
bustion, thus avoiding the present damping of the air fed to the fuel and the consequent
imperfect combustion of the fuel.
Another advantage attained by employing my improved grate slide is that regardless
of the size of the furnace or the kind of fuel employed a continuous fire can be kept
up without attention or fresh charging.
The cold inflowing air with the hot inner surfaces of the slide and becomes warmed,
at the same time, however, cooling the slide to such an extent that if the said slide
is made of good wrought iron it is perfectly able to withstand the action of the intense
heat generated in the furnace.

page_text: The grate slide also acts as an excellent stoker by means of which all packed fuel,
lumps of fuel or fuel wedged between the firebars can be loosened without any cold
air being admitted into the combustion chamber. The grate slide can be used for all
kinds of furnaces or fire places. For large surfaces of grate the slide is provided
with strengthening ribs which also give off warmth by radiation and when the slides
are of large size they can the operated by mechanical means or by means of an
appropriate motor. For my large gratest.two or more slides can be used laterally to
the main slide.
It will be evident from the foregoing that I do not confine myself to the application
of my grate slide to any special kind of furnace, as the same can be applied to the
most various kinds of furnaces when the size and form of the hollow grate slide are
correspondingly modified.
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 :-
.
1. Regulating the generation of warmth and the giving off of the heat produced,
according to requirements, by altering the size of the free grate or heating surface by
adjusting a grate slide, which is so constructed that by means of the same, heated jair
is led into the combustion chamber and to the combustible gases from the coking fuel,
and when the grate slide is given a shaking movement packed or lumpy fuel and fuel
wedged or squeezed between the fire.bars is loosened and forced into the combustion
chamber and the fuel simultaneously stoked, substantially in the manner set forth and
shown.
2. The construction and application of my improved grate slide as and for the
purposes set forth in the foregoing specification and substantially as represented in
the accompanying drawings. _
Dated this 10th day of February 1800
•
PHILIP M. JUSTICE,
Associate Agent...