IMPROVEMENTS IN TRANSPORTABLE BAKING OVENS
Year: 1882

page_text: LETTERS PATENT to Edwin Ambrose Brydges of the firm of Brydges & C°
Engineers and Patent Solicitors of 107 Königgrätzor Str. in the City of Berlin
and German Empire and of 6 St Leonard's Terrace Upton in the County of
Middlesex for an Invention of "IMPROVEMENTS IN TRANSPORTABLE BAKING
OVENS Communicated to him by David Grove, Sanitary Engineer, of the
City of Berlin in the German Empire aforesaid
"
PROVISIONAL SPECIFICATION left by the said Edwin Ambrose Brydges
at the Office of the Commissioners of Patents on the 9th November 1882.
EDWIN AMBROSE BRYDGES of the firm of Brydges & C° Engineers and Patent
Solicitors of 107 Königgrätzer Str in the City of Berlin and German Empire, and
of 6 St Leonards Terrace, Upton in the County of Middlesex. "IMPROVEMENTS IN
TRANSPORTABLE BAKING OVENS a communication to me by David Grove
Sanitary Engineer of the City of Berlin in the German Empire aforesaid..
"
This invention relates to improvements in transportable baking ovens which said
ovens are so arranged that the same can be placed on a carriage without loss of
time and without alterations of any kind and can be employed as stationary or
transportable oven to like good advantage.
The operation is continuous and the matter to be baked charged by means of
sheet metal plates running on rollers.
The baking compartment is heated by means of hot air which is guided around
the fire box by means of suitable canals, is thus heated and then circulates around
the walls and crown of the baking chamber, chambers or compartments
In this manner a perfectly equable heating of the oven is attained and in order
to regulate the heat, slides or flaps are arranged in the air channels or passages.
The double metal walls of the apparatus are constructed of sheet iron or other
suitable material the space between which said walls being filled out with a non
conducting material such as Asbest, Ashes, silicious marl & and also a layer of air
in order to prevent radiation.
The space between the walls of the oven and the walls of the carriage in which
the said oven is placed is also filled out with non conducting material
Beneath the baking oven is a hollow space which is filled with a good heat,
retaining material in order to be able to store up the heat.
The framework of the carriage rests at the rear part on a U formed axle and in.

page_text: front on the customary arrangement. The oven proper can be pushed or slid into
the carriage.
The walls consist as aforesaid of double walls of sheet iron which are provided
with linings of asbest pasteboard, asbest rope or other isolating material of such
thickness that a layer of air remains between these said linings.
The heating apparatus is arranged at the rear end of the carriage and consists
of a chamotte or fire proof clay chamber with a suitable grate or firebars, firebridge
and chamotte or fireproof clay chambers which contain the canals or flues for the
products of combustion. These chambers of chamotte or fireproof clay rests on
transverse angle irons. The gases or products of combustion pass through suitable
openings into two side flues from thence into other suitable flues or canals and
from thence into the combustion chamber which occupies almost the entire breadth
of the carriage and ends in the chimney.
The baking compartments are supported by transverse angle iron above the firing
or heating apparatus. These said baking compartments are heated by hot air which
said hot air circulates around the chambers of fire proof clay of the heating
apparatus and the baking compartments and within the entire space enclosed by
the double walls of sheet iron-The circulation is produced and regulated by a
sheet metal casing which is left open at the right hand-side-so-that-the-heated-air
passes upwards, becomes cooled, sinks to the left, passes through openings arranged.
at the lower part of the apparatus and passes again into the combustion chamber
in order to recommence the circulation as mentioned above.
The circulation between the baking chambers is regulated by suitable plates or
flaps which are so arranged-at-the bottom- of-the-baking-compartments that the-
same can be moved to the side.
The baking compartments are charged by means of metal plates mounted on
rollers several of which can be run into each baking compartment and which serve
-to-carry the bread-or-other-matter-to-be-baked.
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In order to be able to ventilate the baking compartments, perforated rosettes
¯with¯regulating rotary-slides are arranged in the front surface-of-such-said-baking.
compartiment.
Each baking compartment contains further two ventilating tubes or pipes
which lead to the exterior of the carriage in order to allow the vapor produced to
escape.
A warın water reservoir is arranged below the seat at the front part of the
carriage.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Edwin Ambrose Brydges in the Great Seal Patent Office on the
9th May 1883.
EDWIN AMBROSE BRYDGES of the firm of Brydges & C° Engineers and Patent
Solicitors of 107 Königgrätzer Strasse in the City of Berlin and German Empire and
of 6 St Leonards Terrace, Upton in the County of Middlesex IMPROVEMENTS IN
TRANSPORTABLE BAKING OVENS a communication to me by David Grove Sanitary
Engineer of the City of Berlin and German Empire aforesaid.
"
This Invention relates to improvements in transportable baking ovens which said
ovens are so arranged that the same can be placed on a carriage without loss of

page_text: time and without alterations of any kind, and can be employed as stationary or
transportable oven to like good advantage.
The operation is continuous and the matter to be baked charged by means of
sheet metal plates running on rollers.
The baking compartment is heated by means of hot air which is guided around
the fire box by means of suitable canals, is thus heated and then circulates around
the walls and crown of the baking chamber, chambers or compartments.
In this manner a perfectly equable heating of the oven is attained and in order
to regulate the heat, slides or flaps are arranged in the air chambers or passages,
The double metal walls of the apparatus are constructed of sheet iron or other
suitable material the space between which said walls being filled out with non-
conducting material such as asbest, ashes, silicious marl etc and also a layer of air
in order to prevent radiation.
The space between the walls of the oven and the walls of the carriage in which
the said oven is placed is also filled out with nonconducting material.
Beneath the baking oven is a hollow spaco which is filled with a good heat
retaining material in order to be able to store up the heat.
Figure 1 shows & Cross section.
Figure 2 shows a longitudinal section and
Figure 3 a horizontal section of the heating apparatus on the line A. B. in
Figure 2.
The framework of the carriage a b c d rests at the rear part on a U formed
axle e and in front on the customary arrangement. The oven proper can be pushed
or slid into the carriage. The walls a¹ consist as aforesaid of double walls of sheet
iron which are provided with linings of asbest pasteboard, asbest rope or other
isolating material of such thickness that a layer of air remains between these said
linings.
The heating apparatus is arranged at the rear end of the carriage and consists of
a chamotte or fire proof clay chamber with the suitable grate or firebars g, fire
bridge and the chamotte or fire proof clay chambers i which contain the canals or
flues for the products of combustion. These chambers of chamotte or fire proof clay
rest on the transverse angle irons.
The gases or products of combustion pass through suitable openings fl into two
side flues k from thence into other suitable flues or canals and from thence into
the combustion chamber 7 which occupies almost the entire breadth of the carriage
and ends in the chimney m.
The baking compartments n are supported by transverse angle irons above the
firing or heating apparatus.
These said baking compartments n aro heated by hot air which said hot air
circulates around the chambers of fire proof clay i of the heating apparatus and the
baking compartments, and within the entire space enclosed by the double walls a¹
of sheet iron.
The circulation is produced and regulated by a sheet metal casing 888 which
has an opening t at the right hand side so that the heated air passes upwards,
becomes cooled sinks to the left and passes through openings 8' 8' arranged at the
lower part of the apparatus and passes again into the combustion chamber in order
to recommence the circulation as mentioned above.
The circulation between the baking chambers is regulated by suitable plates or
flaps p' which are so arranged at the bottom of the baking compartments that the
same can be moved to the side.
The baking compartments are charged by means of metal plates o mounted on
rollers several of which, can be run into each baking compartment and which serve
to carry the bread or other matter o' to be baked.
In order to be able to ventilate the baking compartments n, perforated rosettes q
with regulating rotary slides are arranged in the front surface of such said baking
compartiment.
Each baking compartment contains further two ventilating tubes or pipes n¹

page_text: which lead to the exterior of the carriage in order to allow the vapour produced to
escape.
A warm water reservoir t¹ is arranged below the seat at the front part of the
carriage.
Having now described my said invention for improvements in transportable 5
baking ovens and the manner in which the same is to or may be carried into effect,
I wish it to be understood that what I claim and desire to secure by Letters
Patent is :-
1. The general construction arrangement and employment of a transportable
baking oven for military and other purposes for continuous operations consisting 1
of a carriage with inserted box casing or receiver of nonconducting material which
is heated by means of a suitable heating apparatus or calorifier and also the
arrangement of a casing of nonconducting material consisting of isolating layers of
asbestos, asbestos rope or cable, or asbestos pasteboard or its equivalent between
which said layers a layer of air is provided and whereby the entire box or casing 1
is surrounded by sheet iron which acts as frame to the said nonconducting casing or
case or box substantially as described in the foregoing specification and shown in
the accompanying drawings.
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II. The construction arrangement and employment of the chamotte or fireproof
clay chamber or compartment f in combination with the grate or firebars g, fire- 2
bridge, the chamotte or fireproof clay chambers ii and the flues for conducting
the products of combustion and in combination with the openings f¹, the side flues k,
the flues and the combustion chamber / substantially as described in the foregoing
specification and shown in the accompanying drawings.
III. The production and regulation of the current of air or draught by 2
employing the perforated sheet metal s and the adjustable slides p' substantially
as described in the foregoing specification and shown in the accompanying
drawings.
Witnesses
ANTHONY STEFFEN
ARTHUR BACRMANN
EDWIN A BRYDGES (L.S.)