IMPROVEMENTS IN OVENS HEATED BY GAS
Year: 1884

page_text: I, THOMAS FLETCHER of Thynne Street Warrington in the County of Lancaster
Manufacturer of Gas apparatus, do hereby declare the nature of my invention for
IMPROVEMENTS IN OVENS HEATED BY GAS to be as follows:-
These Improvements relate to Ovens heated by gas. Such ovens have already
been constructed of cast iron lined with fireclay or other tiles and of wrought iron
lined with cast iron. This Invention has for its object to dispense with the use of
the heavy lining tiles and of wrought iron which from its nature is liable to rust
and other injury or damage and consists in constructing such ovens entirely of cast
iron in such a manner that the oven shall have a cellular non-conducting casing
and that the sides, top and other parts may be readily separated and packed flat
or in a small compass for storage or shipment. The natural scale left on the
surface of the castings helps to preserve them from rust while their hardness and
rigidity protects them from liability to damage in ordinary use.
The casing of the ovens may be constructed in such a manner that the cellular
form is secured by an inside lining of plates or tiles cast separately from the
external plates and attached thereto in such a manner that the lining plates or tiles
are insulated as far as is practicable from the external plates by making the
metallic connections between them as few as possible. The cellular spaces or the
space between the lining and the external plates may form an air space or spaces
or may be packed with silicated cotton, slag wool or other non-conductor of heat.
Ovens constructed according to my Improvements are more particularly adapted
for export and for hiring purposes. When the fireclay tile lined ovens are used the
tiles become stained discoloured in use and their value for hiring is thereby
diminished but the appearance of the cast iron lining may be restored by the
application of whitewash which removes that evidence of previous use.

page_text: I, THOMAS FLETCHER of Thynne Street Warrington in the County of Lancaster
Manufacturer of Gas Apparatus, do hereby declare the nature of my invention for
IMPROVEMENTS IN OVENS HEATED BY GAS, and in what manner the same is to be
performed, to be particularly described and ascertained in and by the following
statement:
These Improvements relate to Ovens heated by Gas. Such ovens have already
been constructed of Cast iron lined with fire clay or other tiles and of wrought iron
lined with cast iron.
This Invention has for its object to dispense with the use of the heavy fireclay
lining tiles and of wrought iron which from its nature is liable to rust and other
injury or damage and consists in constructing such ovens entirely of cast iron in
such a manner that the oven shall have a cellular non conducting casing and that
the sides, top and other parts may be readily separated and packed flat or in a small
compass for storage or shipment. The natural scale left on the surface of the
castings helps to preserve them from rust while their hardness and rigidity protects
them from liability to damage in ordinary use.
And in order that this Invention may be more readily understood and carried
into practical effect I have hereunto appended a sheet of Drawings having marked
thereon letters to which reference is hereinafter made.
Fig 1. represents partly in front elevation and partly in vertical section an oven
constructed according to these Improvements. Fig 2 shows a horizontal section of
the same oven.
The casing or external part A of the oven may be constructed in such a manner
that the cellular form is secured by an inside lining of plates or tiles B cast
separately from the external plates and attached thereto by screws E. E. or other
suitable means in such a manner that the lining plates or tiles are insulated as far
as is practicable from the external plates by making the metallic connections
between them as few and as small as is consistent with the attainment of the
necessary rigidity and strength. The distance apart of the external and of the
lining plates is regulated by the distance pieces C cast upon the plates. The cellular
spaces or cavities D. thus formed may be filled with silicated cotton, slag wool,
asbestos or other non-conductor of heat or they may be left to form an air space.
The sides, top and door of the oven are most conveniently made separately so that
each part consists of external and lining plates with the cavity between them, the
parts may then be secured to each other by screws E. E and where required by
angle plates as at F the door being attached by its hinges. To prevent buckling or
cracking of the lining plates or tiles these are always formed in two or more
portions as indicated at H Fig 1. Carriers for the shelves may be cast upon the
lining plates as shown at G. G.
Ovens constructed according to my Improvements are more particularly adapted
for export and hiring purposes. With fireclay lined ovens the lining tiles speedily
become discoloured in use and their value for hiring is thereby diminished with the
herein before described cast iron linings a coat of whitewash at once removes the
evidence of prior use.
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 cast iron ovens heated by gas the use of cast iron lining tiles or plates so
arranged or constructed that a space or cavity is formed between the lining and
casing substantially as and for the purposes herein before set forth and described.