Improved "Field" Boiler
Year: 1895

page_text: Date of Application, 8th Nov., 1895-Accepted, 15th Feb., 1896
Improved "Field" Boiler.
I, JOANNY SCOTTE of 5 Rue Saint Victor Epernay, Marne, in the Republic of
France, Manufacturer, 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 :-
This invention relates to an improved boiler of the Field type, comprising
improvements which render its use very advantageous in a large number of
cases, but more particularly in its application to steam carriages travelling
on roads.
In order to allow the nature of my invention to be easily understood, I will
now describe with reference to the. accompanying drawing the whole arrangement
of the boiler as well as the special parts which characterize it.
The boiler provided with its accessories is shown in the accompanying drawing
in vertical section along its axis.
The boiler is composed of a cylindrical body A terminated at its upper end by
a dome surmounted by a double-walled chimney B and having a pipe C passing
through said dome to convey the gases of combustion into the chinney. At its
lower part the cylindrical body A is terminated by an ashpan D provided with a
door D¹ for cleaning purposes.
E is a group of tubes on the Field system suspended from a tube plate E'
which forms the top of an inner cylindrical body F which contains the grate
of the furnace G, and from whence the smoke pipe (starts. The grate G has
fixed bars and hinged movable bars in order to allow of its being cleaned by
manipulating levers G'. An opening G' closed by a door is provided through
which to charge the fuel.
The boiler is provided with a vessel H communicating with the water and steam
and containing a manometer and a water level indicator. The safety valve box I is
placed on the dome.
The boiler comprises in addition a water circulator, an anti-incrustation feed-
heater, a steam superheater and a spark arrestor, of which I will now give the
detailed description.
WATER CIRCULATOR.
In order to ensure the rapid and regular vaporization a continuous circulation
of water is established in the boiler by means of a tube J, which takes water
at J, passes through the double wall at J' in a screwed sleeve or stuffing box
forming a tight joint, then mounts vertically between the group of tubes and
ends at the top of the boiler at J. This tube directly heated by the flames of
the furnace is constantly traversed by water which circulates from J¹ to J³. It
is formed of several parts connected by pipe flanges and can be easily taken
apart for convenience in cleaning. The joint placed in the furnace is protected
against the action of the flames by a screen. K, which serves at the same time as
a movable deflector forcing the products of combustion to distribute themselves
round the tubes E before entering the pipe C. This screen, the position of which
is adjustable, is suspended by two rods K¹ to a crosspiece K. By adjusting the
fixing screws of the rods, the screen K can be caused to ascend or descend more
or less.
:

page_text: 4. In a steam boiler of the kind hereinbefore described, a steam super-heater
formed of a pipe (M³), a vessel (M) to receive steam from said pipe and having
a discharge opening adjustable by means of a valve or slide, and a coil (M³).
placed in the track of the gases of combustion and adapted to receive steam from
said vessel, substantially as and for the purpose herein before described and
illustrated.
5. In a steam boiler of the kind herein before described, the construction and
application of a spark arrestor (N) with its bottom (P) inclined towards a discharge
opening (O), its smoke exit closed by perforated sheet metal (Q) and having a
suspended deflector (T) all substantially as and for the purpose hereinbefore
described, and shown on the accompanying drawing.
Dated this 6th day of November 1895.
WM. P. THOMPSON & Co.,
Of 6 Lord Street, Liverpool, Agents for the Applicant.