Year: 1899

page_text: I, LOUIS LORENZ, of 10A, Kurassierstrasse, 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:
The subject matter of this invention is an independent stove with descending
and reascending fire-gas current or stove insertion to be fitted into tiled stoves,
and which provided with two heating chambers placed side by side, and com-
municating with each other by a narrow slot only in the lower part, and in which,
in both forms of execution, after the complete suppression of the fire the egress
of any combustion gases which may still be present or may be subsequently formed
in the stove, is rendered possible by an arrangement which is automatically
brought into action on the draught being shut off, while in the form of construc-
tion as an insertion for a tile stove, a direct evaporation of water caused by the
heat of the stove, .and which it has not hitherto been found possible to realise in
this form of stove, takes place at the same time.
In the annexed drawing this construction of stove is shown:-
Fig. 1 is a vertical section along the line A-B, Fig. 2.
Fig. 2 is a front elevation and partial vertical section along C—D, Fig. 1. while
Fig. 3, shows the fire basket carrier.
Fig. 4, the grate of the fire basket.
Fig. 5, a, toothed protecting ring above it.
Fig. 6, the draught regulating arrangement in front elevation.
Fig. 7, the draught regulating arrangement in vertical section along E-F,
Fig. S.
Fig. 8, the same along G--H, of Figs. 6 and 7.
Fig. 9, shows the water evaporation arrangement as well as the arrangement
of the partition wall between the two heating chambers, in the case of a stove
insertion, in vertical section.
Fig. 10, shows the water evaporating arrangement in front elevation.
The outer casing of the stove, which may either be made of round or polygonal
section, may preferably consist of two superposed halves a and b, of which the
upper one receives the fire basket e and the fuel-chamber d, while the lower one,
which, by a vertical partition is divided into two separate chambers,-(which,
however, communicate with each other in the lower part) f-g, serves to receive
the products of combustion and conduct them to the chimney flue along a channel
which first descends and then ascends. The upper half of the stove casing is pro-
vided with a convex and perforated cover h, underneath which the closing plate
is firmly seated, which is provided with an aperture i serving for the introduction
of fuel (and which can be closed) and with a water vessel k. The fuel chamber d
arranged underneath this plate, consists of a cylindrical and a conical part, the
cylindric extension of which, terminates above the fire basket c, at a convenient
distance from its grate m. The fire basket which is closed in all round and is
only open above, towards the fuel-hopper orifice, comprises, besides the grate, a

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toothed protecting ring n arranged above it, which is to prevent excessive accumu-
lation of coal on the grate, and besides this, an ash box o is arranged underneath,
the contents of which can be removed as required through a horizontal nozzle p of
rectangular section, arranged in the side of the fire basket. The upper. margin
of the opening of the fire basket is provided with flat lobes turned towards the
outside, in order to prevent any coal from dropping into the annular space
between its outer side and the stove casing. The inner surfaces of this space
through which the fire gases pass, after their generation in the grate, on their
way to the anterior heating chamber f. are provided with longitudinal and
transverse grooves or notches so as to afford a hold for fire-proof material with
which they will require to be lined in order to resist the great heat existing in
this part. This inner circular space is accessible through a door 13 which is
made with double walls with a space between them. The fire basket is held in
position by a ring 7, which rests with three or more projections on brackets or
supports which are arranged on the inner side of the upper margin of the
lower part of the stove casing b.
By means of the partitons, which is first placed vertically and then extends
towards the side, terminating above the pipe nozzle (arranged in this part for
the purpose of carrying off the fire gases) this lower part of the stove casing is
divided into two separate halves which, however, communicate with each other by
a slot immediately above the bottom w. In the vertical part of this partition s
there are two tubes which converge towards one common orifice arranged
below in the centre of the bottom, w, from which they are carried in opposite
directions towards the stove casing in the sides of which their outlets are arranged.
The purpose of these tubes is to afford, within the lower part of the stove casing,
by reason of their large area, a heating surface of great efficiency, by which the
air from the room, entering underneath the bottom plate and passing through
the tubes, and out at the sides of the stove, will be rapidly heated by the heat of
the fire-gases playing round the partition.
Into an opening arranged in the upper part of the stove casing, on a level with
the fire. basket, a box a closed on all sides, is arranged so as to fit hermetically
into this opening so that its outer side comes nearly flush with the margins of the
opening, while its hindmost half is inserted into the rectangular nozzle p (pro-
vided for the removal of ashes, in the side of the fire basket ) so as to fit tightly
into it. This box is fitted with two slides, one of which y slides along the vertical
wall at the back, in front of an opening 7 arranged in it, for the purpose of regu-
lating the admission of air to the grate of the fire-basket, while the other,' serves
to open the slots 2, in the bottom plate, (leading into the anterior heating
chamber f) whenever the opening 7, controlled by the fire-basket slide, is wholly
or nearly closed. Both slides y and are worked simultaneously by means of a
horizontal spindle 4 which is provided, outside the perforated front face of the
box, with an adjusting lever 3, the first-mentioned slide being acted upon direct
and the second by means of a cam, so that slide will always be open whenever y
is wholly or partially closed. By this combination a draught through the stove is
established even when the fire has been extinguished by shutting off the supply
of air to the grate, so that any gases which after this may still remain in the
interior, or which may subsequently be developed, will be carried into the chimney.
any accidental closing of the channel through suction being thus rendered
impossible.
The front face of box which projects just outside the stove casing is provided
with a projecting segment strip 6, into the notches of which the adjustable spring
lever 3 can be fixed so as to regulate the intensity of heating to the desired
degree, by more or less opening the orifice 7, through which air is admitted to
the grate.
If this construction is used in the case of insertions for tile stoves, more
especially in cases where the available space is very limited, it is expedient to
reduce the height of the space below the fire basket, for the heating chambers f

page_text: and g, and to arrange the partitions between them along the fire basket (which
in this case would be placed excentrically with regard to the centre line of the
stove) and the lower feed-hopper ring, up to above the smoke nozzle f. This
modification, which does not affect the essential nature of the invention may be
made in this case all the more easily because in the construction here in question
the tube arranged in the partitions are dispensed with, their function being
supplied by the tiled sides of the stove.
In order to obtain, in the mode of application just referred to, an evaporation
of water caused direct by the heat of the stove (such as has never before been
applied in this form in the case of stove insertions, the cleaning door 8 which
serves for removing any ashes deposited in the passages, and which is arranged
over the bottom plate of the heating chambers f and g in both modes of con-
struction, is in this case provided with a closed chamber 9 projecting into the
interior of the stove and the horizontal bottom plate of which carries a water
vessel 10, accessible through a door or valve 11, arranged in door 8, in front of
the water vessel, while the steam formed can escape through an aperture 12,
placed above this door or valve and the size of which can be regulated by an
adjustable slide or valve. The interior of chamber 9, is completely separated
from the heating space f. but the fire gases circulating within space f play round
the sides of chamber 9, so that an energetic evaporation of the water contained in
vessel 10 must necessarily ensue.
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
1. In a stove with descending and reascending flue, of circular or polygonal
section, and consisting of two superposed halves (a and b) the arrangement of a
partition which is at first vertical but finally extends obliquely upwards towards
the inner side of the stove, within the stove chamber b situated underneath the
fire basket so that the half / parted off from this space or chamber
by the said partition, communicates with the annular chamber situated
between the vertical outer side of the fire basket c and the inner
side of the upper part of the stove casing which surrounds the
fire basket " at a certain distance, (and through which annular
chamber the fire gases, after their development pass downwards) while the other
half communicating with the former by a slot e arranged below in the parti-
tion. is connected with the chimney by a nozzle or stove pipe which enters into
the stove casing at the highest part of the said chamber gas and for the purpose
herein set forth and constructed substantially as shown by the appended drawings.
2. In the stove, as set forth in Claim 1, the arrangement of two tubes e in the
vertical part of the partitions situated in the lower half of the stove, so that
the pipes, join each other in one common orifice situated in the centre of the
bottom plate of the stove, from which they ascend in opposite directions to-
wards the stove casing, having their outlets in the sides thereof, as and for the
purpose herein set forth and constructed substantially as shown by the appended
drawings.
3. In the stove as set forth in Claim 1, the arrangement for regulating the air
supply, consisting of a box r fitted on the one hand into the upper part of the
stove casing and on the other hand into a horizontal rectangular nozzle > issuing
underneath the grate m of the fire basket c which box is provided with holes in its
front and back and bottom, out of the number of which holes the one situated
towards the space underneath the grate, in the back of the box, and the one lead-
ing to the anterior heating chamber f of the lower part of the stove b. in the
bottom of the box, are regulated by means of their slides y and z worked simul-
taneously by a spindle 4, so that after the opening leading to the grate has been
shut off, the opening leading to the heating chamber in the lower stove 2 is auto-
matically open, as and for the purpose herein set forth and constructed substan-
tially as shown by the appended drawings,

page_text: 4. In the stove as set forth in Claim 1, applied as an insertion for a tiled stove;
the continuation of the partitions from the lower part of the stove b, which in
this case will be reduced in height, by the side of the fire basket (which in this
case would be placed excentrically to the centre line) and of the lower coal
hopper ring, up to above the upper stove pipe nozzle leading to the chimney,
while omitting the air circulating tubes ie which in the independent stove are
arranged in the partitions, as and for the purpose herein set forth and con-
structed substantially as shown by the appended drawings.
5. In the stove insertion as set forth in Claim 4, the arrangement of a chamber
closed on all sides 9, projecting into the anterior heating chamber f of the lower
part of the store b.on the door 8, (provided for cleaning the lower parts of the
interior space), for the reception of a water vessel 10, rendered accessible by a
flap or door 11, in the said door, the steam generated being carried off through
an aperture 12, arranged above this flap, and the size of which can be regulated
by means of a slide or valve, as and for the purpose herein set forth and con-
structed substantially as shown by the appended drawings.
Dated this 21st day of June 1899.
J. E. EVANS-JACKSON & Co.,
Agents for the Applicant.