Improvements in Blow Lamps for Tinners, Plumbers, and the like.
Year: 1897

page_text: Date of Application, 26th June, 1897-Accepted, 31st July, 1897
COMPLETE SPECIFICATION.
Improvements in Blow Lamps for Tinners, Plumbers, and the like.
We JOHN CURTIS DUPEE of Warren Avenue, Chicago, State of Illinois, U.S.A.,
Master Mechanic, JOSEPH FRANK SHAPLAND), of Harrison Street, same place, Brass
Finisher, and LOUIS CHRIST STROTII of Fulton Street, same place, Brass Finisher,
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 a tinner's furnace in which hydrocarbon oils, preferably
of low gravity, may be advantageously used without carbonising and obstructing
the burner or the passages leading thereto; and further to such a construction
of the burner that soldering irons may be heated therein without overheating the
point and thus destroying or impairing the tin surface thereon.
In the accompanying drawing Fig. I is a vertical section of the furnace of this
invention on line 1-1 of Fig. 3. Fig. 2 a like view on line 2-2 of Fig. 3.
Fig. 3 a horizontal section on line 3-3 of Fig. 1. Fig. 4 an enlarged detail
sectional view on line 4–4 of Fig. 3, shewing a portion of the retort, and Fig. 5
is an enlarged rear view in detail of said retort or primary heating chamber.
a is the usual oil tank in connection with the furnaces of this class and, provided
with a suitable aperture for receiving the oil and a valve controlled tube 6 with
which is connected the ordinary flexible tube or bulb for forcing air into the
reservoir.
C
A T-piece is screwed into the top of the reservoir and is provided with the
nsual needle controlling valve, the, stem d of which is extended, as shewn, to the
front of the furnace. A short tube e is screwed into the top of the T-piece c and
into the bottom of the retort f which contains the primary heating chamber.
The retort consists of a hollow metal casting having the central opening g
and the circular chamber communicating at the bottom with the tube e and
closed at the top by means of the screw plug i. An elbow tube k,is screwed into
the upper portion of the retort at its rear, and is extended rearwardly and down-
wardly therefrom. A nipple (Fig. 2) having a fine aperture therein, is located
in the lower end of said elbow concentrically with the opening g so as to project
a jet of vapour forward through said opening. Flanges m project rearwardly
from around the sides and top of the opening while notches n are preferably
formed therein for the admission of air in addition to that which may enter from
the rear.
An annular flange is formed upon the part f into which is fitted a
oylinder p consisting of two semi cylindrical pieces having flanges q which serve
to completely close the forward end of the cylinder as well as to attach the two
halves together by means of the screw r. The interior of the cylinder p forms
both a mixing chamber and primary combustion chamber and is provided with a
series of openings at the sides, from which the flames may issue. A central
stud projects upwardly from the bottom of the mixing or primary combustion
chamber for the purpose of dividing the flame.
Extending laterally from the drip cup are arms which form a bracket or
support for a metal plate which is bolted thereto, as shewn, and is curved

page_text: upwardly at the sides and is preferably provided with flanges for the reception of
a counterpart plate or shield to the walls, of the two being so curved at the sides
as to form an oval in cross section, (Fig. 1). The part to is provided with a
depending hood (Figs. 2, 3) which is extended below the elbow and is adapted
to shield the jet from the action of cross drafts of air. The space between the
plates v, w, forms a secondary combustion or heating chamber for heating soldering
irons, which are placed in said chamber in the manner indicated in dotted lines
in Fig. 3.
'
The plate is provided with openings near the front, and openings y in the rear
for the admission of air in such a way as to strike the point of the soldering iron
and prevent it from becoming overheated, while the plate or hood w is likewise
provided with openings at the rear, which in effect serves the purpose of a
chimney. A shield beneath the secondary combustion chamber serves to protect
the reservoir from radiation.
Air being forced into the reservoir, the valve stem is turned sufficiently to
permit the oil to flow upwardly through the retort and issue from the nipple 7
into the drip cup j. The oil is then lighted in the drip cup in the usual manner
for the purpose of heating the retort. As soon as the latter becomes sufficiently
heated to partially vaporise the oil it issues from the nipple in the form of a
vapourised jet consisting partly of gas and partly of oil, which readily ignites the
flame or jet passing through the opening and thus serves to heat the retort or
chamber to a temperature sufficiently high to partially vaporise the oil without
causing it to carbonise and thus obstruct the passage. The jet then passes into
the primary combustion or mixing chamber formed within the cylinder where
it strikes the obstruction and is divided and directed laterally towards the
openings and being unable to escape at the forward end the flames are forced
laterally and forwardly through said openings as indicated by the arrows in Fig. 3.
The flames being directed against the curved walls of the plates e, i, are directed
as indicated by the arrows in Fig. 1 so as to meet at the middle above the
cylinder p, against which the two flames are projected downwardly, and caused
to impinge upon the walls of the mixing chamber, thus heating the latter to such
a high temperature as will fully vapourise the oil. At the same time the air is
admitted from the rear through the opening g into the mixing chamber, where it
commingles with the vaporous product of the oil at a temperature sufficiently
high to enable the oxygen to form a chemical union therewith and produce con-
plete combustion. As the tendency of the flames is to shoot forward from the
mixing chamber at about the angle indicated; they are, when brought together,
caused to impinge upon the mixing chamber, but not directly upon the retort,
and inasmuch as air is admitted through the openings y, so as to impinge upon
the retort, it follows that the latter derives most of its heat from the jet issuing
from the nipple 1.
From the above it will be understood that the retort serves only to partially
decompose the oil or initiate its vaporisation, but does not become sufficiently hot
to cause carbonisation, while the mixing chamber is so formed as to constitute a
primary combustion chamber from which the flames issue to the main or heating
chamber and react upon the mixing chamber, thus completing the vaporisation
of the oil at the point of combustion instead of in an enclosure or passage devoid
of air which would become clogged as a result of carbonisation.
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 :-
1. A tinner's furnace in which are combined a source of oil supply, a retort for
heating and partially vaporising the oil, a combined mixing and primary .com-
bustion chamber closed at its forward end and provided with an opening, at its
rear for the admission of air and openings at its sides for directing the flames
into the heating chamber, and a heating chamber wholly or partially surrounding

page_text: said mixing chamber, the walls of said heating, chamber being so shaped as to
direct the laterally issuing flames and cause them to meet and impinge upon the
mixing chamber, substantially as described and shewn.
2. The combination in a furnace of the class described, of a source of oil supply,
nipple in operative communication therewith, a retort interposed between said
nipple and source of oil supply and between said nipple and the mixing chamber,
a combined mixing and combustion chamber closed at its forward end, open at its
rear end, and having a series of openings at its sides, means for dividing the
flame or jet from the nipple when introduced thereto and directing it forwardly
and laterally from the side openings, and an outer heating chamber extending
over the top and having its side walls curved so as to cause the laterally projected
flames to meet, and impinge, upon the mixing chamber, substantially as described
and shewn.
3. The combination with a source of oil supply of the retort f having a central
opening and the circular chamber h, of the nipple in communication therewith
and arranged in the rear thereof concentric with said opening cylindrical mixing
chamber 2' closed at its forward end and provided with openings s at the sides, and
a heating chamber composed of the plates v, w, having their side walls curved;
substantially as described and shewn.
4. The combination in a furnace of the class described, of a retort for heating
the supplied oil to partial vaporisation by means of a jet of flame directed through
an opening in said retort, of a mixing chamber arranged in operative proximity
to said retort, means for introducing air thereto, means for causing the flame to
issue laterally therefrom and an outer heating chamber for directing the flame
back upon suid mixing chamber and openings in the rear of said heating chamber
for permitting air to he brought into contact with said retort and preventing the
same from becoming over-heated, substantially as described and shewn.
Dated this 26th day of June 1897
THOMAS R. SHILLITO,
89 Chancery Lane, London, W.C., Agent for the Applicants.