Year: 1885

page_text: We, FRITZ GRURING-DUTOIT, and AUGUST BURKART, both of Berne, in
Switzerland, do hereby declare the nature of this Invention to be as follows:-
Our improved fire place or grate is so constructed as to produce the same amount
of heat with a smaller quantity of fuel, that is to say, to work more economically
than the systems at present in use.
;
This effect we produce by a particular. arrangement of the air passages or
conduits leading the air to the fuel.:
Our improvements may be- employed in the construction of new stoves, or
adapted to old ones with a view to render them more economical.
According to our invention, we affix, under the fire grate, a case or chamber, the
bottom of which is formed by a removéable plate. In the two: opposite side walls
of this case or chamber, two or more orifices or apertures are contrived for the
entry of air into the case or chamber.
This case or chamber forms a first ash pit, from which the ashes fall into a
second ash pit or box, when the removeable bottom-plate is withdrawn. From
this the ashes may be removed by means of a drawer acting as a shovel.
By closing this drawer, more or less, the quantity of air, entering the second ash
pit or box, may be regulated at will.
The openings in the side walls, before mentioned, may be provided with dampers
or regulating slides, moved by means of a rod.
The air entering the second ash pit or box is warmed by its circulation around
the case or chamber and the lateral arrangement of the openings produce a peculiar
flow which has been found from practical experiments to produce a good effect in
view of obtaining a great regularity in the combustion...

page_text: Improvements in the Fire Places or Grates of Stoves.
We, FRITZ GRURING-DUTOIT, and AUGUST BURKART, both of Berne, in
Switzerland, 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, reference being bad to the accompanying drawings,
and to the letters and figures marked thereon, that is to say :-
Our improved fire place or grate is so constructed as to produce the same amount
of heat with a smaller quantity of fuel, that is to say, to work more economically
than the systems at present in use. It refers more particularly to the arrangement
of a heating case placed under the grate of a fire place of any construction. The
fire once lighted on the grate this case becomes heated and the air, which flows
under the grate through the walls of the case, is so heated as to increase the yield
of the fuel. At the same time the draught. is rendered more regular.
This effect we produce by a particular arrangement of the air passages or
conduits leading the air to the fuel. Our improvements may be employed in
the construction of new stoves or may be adapted to old ones with a view to
render them more economical.
In the accompanying drawings, Fig. 1, shows a transverse section of one
arrangement of apparatus; Fig. 2 a longitudinal section of same, taken on the
line A, B, of fig. 1; and Fig. 4, a longitudinal section through the line C, D, of
fig. 1. Fig. 8 is a front view of the apparatus.
In all the figures the same letters refer to the same parts.
According to our Invention we affix under the fire grate E, a case or chamber G,
the bottom of which is formed by a removeable plate F.
In the two opposite side walls of this case or chamber are contrived two or more
orifices or openings g, for the entry of the air into the case or chamber G.
This case or chamber G, forms a first ash-pit, from which the ashes fall into a
second ash-pit or box H, when the removeable bottom plate F, is removed. From
this the ashes may be removed by means of a drawer I, acting as a shovel.
By closing this drawer I, more or less, the quantity of air entering the second
ash-pit or box H, may be.regulated at will.
The openings g, in the side walls before mentioned may be provided with
dampera or regulating slides J, moved by means of the rods K.
The air entering the second ash-pit or box H, is warmed by its circulation
around the case or chamber G, and the lateral arrangement of the openings g,
produce a peculiar flow which has been found from practical experiments to
produce a good effect in view of obtaining a great regularity in the combustion.
Figs. 5, 6, 7 and 8 refer to modifications, Fig. 5, shewing the apparatus adapted
to a fire place having a square grate. FI is a revolving plate closing a funnel
through which the ashes escape.
Fig. 6 shews an apparatus for circular grátings; FI being a stopper or plug
which may be withdrawn to allow the ashes to fall down, from time to time.

page_text: Fig. 7 is a transverse section of an apparatus having double walls. The air is
heated by passing between these two walls before reaching the grate. The bottom
plate FII, is a swinging one, and when opened takes the position shewn in dotted
lines.
Fig. 8, is a longitudinal section of an apparatus having the same arrangement of
double walls, but with a sliding bottom plate F, instead of a swinging one.
Having thus described our Invention, we declare that what we claim is :-
The combination with a fire grate of any construction, system, or form, of a
heater formed of a case G, placed underneath the grate and provided with
openings g, or with double walls allowing passage to the air, for the purpose of
heating such air flowing to the grate, said case being provided at bottom with a
removeable plate, stopper or plug, substantially as shewn and described.