prov
Year: 1894

page_text: Date of Application, 26th Oct.. 1894
Complete Specification Left, 1st July, 1895-Accepted, 3rd Aug., 1895
Improv
We, EDWARD HESTER NORRIS and CHARLES GERALD HENTY, of 235 Upper
Thames Street, in the City of London, Engineers, do hereby declare the nature of
this invention to be as follows:-
Our invention relates to engines operated by the alternate expansion by heat,
and contraction by cooling, of air, known as hot air engines, and consists essentially
of improvements in the heating furnace, where the heat from the fire or other
combustible material is stored up, concentrated, and rendered steady in its heating
effects upon the air, also of improvements in the character of the gauze or meshes
used in the regenerator; and of improvements in the form and mode of manufacture
of the heater pan.
We may apply these improvements to any known form of hot air engine, but, as
an example, we prefer a form of hot air engine, in which the regenerator is given a
reciprocating movement from a parallel motion combined with the connecting rod
of the motive piston, operating ou the usual crank pin and shaft.
The said reciprocating movement of the regenerator causes the exhausted air to
pass through the said regenerator, to become partially re-heated before reaching
the heater pan, the reciprocating movement of the regenerator being also so
arranged as to alternatively compress and heat, and expand and cool, the air, to
aid the motive action of the main piston.
We fill the piston of such regenerator with gauze, constructed of wire of square
or octagonal section, and suitable mesh, which we find materially increases the
heating and cooling area.
In the furnace of such a hot-air engine, in and about the flame, and at a suitable
distance from the heater pan, we apply a ring or disc of clay or other refractory
material, made in two, three, or more sections, and find by its use a steady
concentration and increase of temperature.
The heater pan we make of mild steel or other suitable material, stamped in a
buckled or corrugated shape, thereby reducing the thickness of material used, and
adding largely to the area and efficiency of the pan as a heater.
Dated this 25th day of October 1891
FELL & WILDING,
1 Queen Victoria Street, London, E.C., Agents for the Applicants.
We EDWARD HESTER NORRIS, and CHARLES GERALD HENTY, of 75 Coleman
Street, in the City of London, Engineers, late of 235 Upper Thames Street, E.C.
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 :-
―
Our invention relates to engines, operated by the alternate expansion by heat,

page_text: and contraction by cooling, of air, known as hot air engines, and consists essentually
of improvements in the heating furnace, where the heat from the fire, gas, or other
combustible material is stored up, concentrated, and rendered steady, in its heating
effects, upon the air; also of improvements in the character of the gauze or meshes
used in the regenerator; and of improvements in the form and mode of manufacture
of the heater pan.
We may apply these improvements to any known form of hot-air engine, but, as
an example, we prefer a form of hot air engine in which the regenerator is given a
reciprocating movement, such as from a parallel motion combined with the connecting
rod of the motive piston operating on the usual crank pin or shaft, or the recipro-
cation of the regenerator may be produced in any other convenient manner.
The said reciprocating movement of the regenerator causes the air from the
exhaust stroke of the engine to pass through the said regenerator, which is packed
with porous material to admit of such passage so as to become partially reheated
in the regenerator, before reaching the heater-pan for final heating. The recipro-
cating movement of the regenerator is also arranged, in a known manner, so as to
alternately partially compress and heat, and partially expand and cool the air, to
aid the motive action of the air upon the main operative piston.
And in order that our invention may be the better understood we now proceed
to describe the same, reference being had to the drawings hereto annexed, and to
the letters and figures marked thereon.
Figure 1 is a vertical section through the furnace, and moving regenerator of a
hot air engine-the other operative parts (of any known construction) being
omitted.
Figure 2 is a part sectional plan of the same, with heating pan and accessories
removed.
Figure 3 is a plan of the refractory sectional ring removed from the furnace.
Figures 4 and 5 are a sectional elevation and plan of the furnace-pan, and
Figures 6 and 7 are a sectional elevation & plan of a modified form of the same.
Figure 8 is a detached plan of the gauze packing used in the regenerator, and
Figs. 9 and 10 are sectional views of the sections of wires used in the said gauze.
In the reciprocating regenerator A, of usual construction, we pack wire gauze B
of square or hexagonal section (Figs. 8, 9 & 10), and suitable mesh, which we find
materially increases the heating and cooling area.
In the furnace C, in and about the flame, and at a suitable distance from the
heater-pan D, we apply a ring or disc E, of clay, or other refractory material,
made in two, three, or more sections, as seen in Fig. 3, and find by its use a steady
concentration and increase of temperature, whilst its sectional arrangement offers
great facilities for fixing, removal, and repairs.
The heater-pan D we make of mild steel, or other suitable material, stamped in
a buckled or corrugated shape, as shown in Figures 4 to 7, thereby reducing the
thickness of the material used, and adding largely to the area and efficiency of the
pan as a heater. When in operation, the reciprocation of the regenerator A causes
the air to pass through the said regenerator, and to be alternately expanded and
cooled, and compressed and heated, whilst in communication by the port F with
the operative cylinder.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed we declare that what
we claim is :-
1st. In a hot air engine the formation of the gauze packing in the regenerator
by wires of a square or hexagonal section, substantially as and for the purposes
described.
2nd. In a hot air engine, the combination with the furnace case and heating-pan,
of a disc of fire-clay or other refractory material, divided in three or more sections,
substantially as and for the purposes described.

page_text: 3rd. In a hot air engine, the construction of the heater pan by stamping in a
corrugated or buckled form, substantially as described and illustrated herewith.
Dated this 1st day of July 1895.
FELL & WILDING,
1 Queen Victoria Street, London, E.C.