An Improved Muffle Furnace.
Year: 1897

page_text: .Date of Application, 4th Jan., 1897
Complete Specification Left, 11th Jan., 1897-Accepted, 29th May, 1897
PROVISIONAL SPECIFICATION.
An Improved Muffle Furnace.
I, STEPHEN SHAIL of 16 Rectory Road Canton, Cardiff in the County of
Glamorgan, Builder do hereby declare the nature of this invention to be as
follows:-
A muffle furnace to expand and contract.
Its-object-is-to-prevent the cracking of the muffle during its immense beat and to
procure 2000° Fahrenheit.
My invention relates to an oven for heating steel and iron plates also for tinning
galvanising and enamelling purposes.
Its construction is of an oven, a fire kiln, and a series of flues and baffles and
regulating dampers soot doors, inlet-air ventilators, with furnace and muffle doors.
The oven is built on an arch principle and of fire resisting material being of fire
lumps made from clay which are all prepared special for same. All joints are
prepared for asbestos packing to prevent them sticking and for expanding freely
without damage to the oven. The main key is composed of a steel tube where
expansion first takes place. The sole of the oven is constructed on an invert principle
and rabbetted for asbestos.
The fire kiln is also prepared of fire resisting material with fire bars, bearings, and
the like with its air inlets and its gas outlets.
The flues and baffles are also formed with fire resisting material to convey the heat
where required.
The regulating dampers are so fixed at the junctions of the flues to command
the draught from two flues and when open to assist the two draughts in meeting.
The soot doors are so fixed that all flues are accessible for cleaning purposes.
The inlet-air ventilators are made to open and close so that the inlet of air can be
regulated.
The furnace or kiln door is for admitting the fuel.
The muffle doors which work inside the air-tight door of the oven, work inside to
resist the heat from the latter.
This invention is easily repaired as any section can be taken out and a new one
substituted without taking down or damaging the adjoining sections. It is also very
economising in fuel.
Dated this 2nd day of January 1897.
STEPHEN SHAIL,
16 Rectory Road, Canton, Cardiff.
An Improved Muffle Furnace.
I, STEPHEN SHAIL of 16 Rectory Road Canton Cardiff in the County of
Glamorgan, Builder, 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 muffle furnaces to expand and contract with the heat and
the all

page_text: Its object is to prevent the cracking or- the damaging of the muffle during its
immense heat of 2000° Frn.
My invention consists in a méthod of allowing the muffle to expand and contract.
In the two accompanying sheets of explanatory drawings to be hereinafter referred
to :-
Figure 1 on Sheet 1 is a cross section and Figure 2.is a plan of the furnaco.
Figure 3 on Sheet 2 is a section longitudinal.
Figure 4 is a plan at the oven's level.
The same reference letters in the different views indicate the same parts.
In carrying my invention into effect I arrange a muffle constructed of firelumps
as shown at the joints of which are prepared for iron or steel tubes as shown
at D. The joints of C are also inlaid with asbestos to prevent the firclumps C
sticking together.
I arrange a fire kiln E directly under the sole of the muffle C, which is prepared
on an invert principle to convey the heat around the fire-lumps C, and to act upon
the tubes. D which commence to expand and open the joints of the firelumps C.
The expansion travels upwards with the heat. I arrange a space underneath the
baffle F to allow for the expansion. The vertical joints of the fire-lumps C are also
prepared for asbestos packing. The sole of the muffle or oven G is rebated for
asbestos packing also, to prevent the gases from kiln E or the flue H from getting
into the oven.
I also construct a segmental baffle I. underneath the oven G to support the sole of G
and to convey the gases from the kiln E equally over the firelumps C.
The fire kiln E is built of fire-bricks and clay with fire bars and bearings J
Figure 2 air-inlets K and gas-outlets L Figure 3. The flue M returns the gases and
the smoke over the heated surfaces of the muffle before passing away to the culvert.
The key N in baffle F passes the smoke from flue H to flue M. The key N is
also fitted to allow the baffle F to expand and contract.
::
The retaining ring O is weighted with sand to keep the heat from passing away.
The regulating damper P is fixed at the junction of the flues M. to command the
draught from them, and when open to assist the gases in meeting. The soot doors Q
are so fixed that all flues are accessible for cleaning purposes. The inlet-air
ventilators R are made to open and close so that air may be admitted when required
into the inlets K. The kiln door S and the baffle doors T are to admit the fuel.
The muffle door U which slides in iron guides are made double to resist the heat
and prevent the cold air from getting into the oven.
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. A muffle furnace to expand and contract.
2. A furnace very economising in fuel and easily repaired as any section may be
taken out and a new one substituted without taking down the adjoining sections.
D
1
+
1000
STEPHEN SHAIL,
No. 16 Rectory Road, Canton, Cardiff.
STEPHEN SHAIL,
No. 16 Rectory Road, Canton, Cardiff.