Transportable Melting Furnace for Soldering or Brazing Parts of Cycle Frames and other Objects.
Year: 1899

page_text: Date of Application, 7th Oct., 1899-Accepted, 18th Nov.,
1899
COMPLETE SPECIFICATION.
Transportable Melting Furnace for Soldering or Brazing Parts of
Cycle Frames and other Objects.
We, ADOLF VOGT and JOSEF FRANZ BACHMANN, both of Tharnlow Road, West
Norwood, London, Engineers, and GUSTAVE LEVE, of 1, Lawn Road, Hampstead,
London, Merchant, 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 construction of portable melting furnace more
particularly applicable for brazing the parts of cycle frames and which consists
mainly of a furnace chamber lined with fire-clay or other refractory material
and having a grate composed of bars that can be withdrawn on which grate rests
a plumbago crucible or receptacle that serves to melt the brazing metal or solder
and to receive the parts of cycle frames to be brazed, the upper edge of which
crucible is maintained at a distance from the fire-clay lining of the furnace
chamber by means of a dished cover plate of the furnace, which cover plate is
formed in separate parts so as to prevent cracking by heat.
The space enclosed by the crucible in combination with the dished cover plate
is enclosed by means of two covers or sheet metal plates which are held closed
during the melting of the solder or brazing metal by means of an arrangement of
toggle levers combined with a treadle lever with counter weight, while during
the time that the parts of the cycle frames are dipped into the molten metal
for brazing or soldering them, the covers are held open.
In the furnace chamber are provided walls reaching from the cover plate down
to near the upper edge of the crucible which walls prevent coke or other fuel
from falling into the latter and at the narrower sides of the crucible are provided
partial partition walls which in combination with the first named walls insure
the uniform distribution of the flames and hot gases and cause them to pass over
the top of the crucible.
We will now more particularly describe the construction of the said portable
melting and brazing furnace with reference to the accompanying drawings in
which Fig. 1 shews a vertical longitudinal section of the furnace, Fig. 2 a cross
section, Fig. 3 a part plan and Fig. 4 an end view of the same.
As shewn, the furnace (which is intended to be heated by coke) rests on a base
plate 1 provided with feet, on which is placed the furnace body, composed of cast
iron plates 2 held together by clamps or lugs and bolts 3.
The furnace body is lined internally with a refractory material such as fire-
clay 4. The bottom of the furnace chamber is formed by the fire-grate 34 com-
posed of removeable bars.
On these bars rests the plumbago smelting crucible 5, which tapers downwards
in funnel form, and which is of comparatively small width in the direction of the
length of the fire bars. This crucible contains the molten brazing or soldering
metal, and into it are dipped the parts of the cycle frames or other objects to be
brazed or soldered.
The furnace chamber is enclosed at top by a cover plate 6, which is formed
in separate parts as shewn in order to prevent it from being cracked by the heat,

page_text: The middle part 7 of the cover plate keeps the crucible at the necessary distance
from the furnace sides by means of descending lugs 32, and it also has on its
under side walls 8 reaching down to near the upper edge of the crucible, which
prevent the coke from falling into the latter. On the opposite narrow sides of
the furnace chamber are partial partition walls 9 which do not extend down to
the grate and which, in combination with the walls 8 force the combustion gases
to pass over the top of the crucible, and produce a uniform distribution of the
heat round the crucible.
The combustion gases flow in the direction of the arrows into the chimney
flue 10, the internal sectional area of which can be regulated by a throttle
valve 33, with balance weight 33* for regulating the temperature of the furnace.
The outer parts of the cover plate 6 are formed with the hollow spaces 11
which serve as continuations of the space in the crucible which receives the cycle
frame. This space is enclosed along its whole length by means of two covers 12
formed of sheet metal strengthened by angle irons, and held by bars 13 arranged
ut the outer sides of the furnace chamber and pivotally connected at their lower
ends at 14 to the base plate 1.
The two rods 13 on the one side of the furnace are connected together by toggle
levers 15, the middle pivot 16 of which is connected to a vertical rod 18 sliding
in a guide at 17.
The lower end of this rod 18 is pivoted to a lever 21 having a treadle 19 at
one end and a counter weight 20 at the other.
When this lever is pressed downward by the treadle the toggle levers 15 are
spread out, thereby turning the rods 13 outward on their bottom pivots so as
to remove the covers 12 from the upper opening. On releasing the treadle 21
the counterweight 20 brings the parts back into their original position.
This arrangement enables the top opening to be kept closed when melting the
brazing or soldering metal and to be kept open when dipping in the cycle frame
parts or other objects for brazing.
The furnace chamber is surrounded by a sheet iron casing 22 into the interior
of which cooling air flows through holes 23 in the base plate, which air issues
through grated openings 24 in the cover plate G.
On the one side of the furnace is provided an opening 25 through which the
grate bars can be withdrawn, and which serves for the supply of air to the fur-
nace and for the removal of the slag and clearing of the grate. This opening
is closed by a furnace door 26 suitably balanced by a weight 26* and having an
opening 27 closed by mica plates for enabling the fire to be observed. The door
being balanced can be held more or less open for regulating the lateral air
supply. The supply of air from below through the grate bars is effected through
an opening 28 which can be regulated or entirely closed by a slide 29 working
in suitable guides.
The introduction of fuel into the furnace is effected through openings 30 in
the cover plate 6, closed by covers.
The furnace can be provided on its free sides with protecting gratings 31,
suitably hung on supports.
Having now particularly described and ascertained the nature of this invention
and in what manner the same is to be performed, we declare that what we claim
is:
1. A portable melting furnace for brazing or soldering parts of cycle frames
and other objects consisting of the combination of a furnace chamber lined with
refractory material and having a fire grate with removeable bars, a crucible rest-
ing upon the furnace grate and adapted to contain the brazing or soldering metal
and the objects to be brazed or soldered and a divided dished cover plate fitting
on the top of the furnace chamber and also fitting round the upper edges of the
crucible so as to maintain this out of contact with the lining of the furnace
chamber, substantially as described.

page_text: 2. In a melting furnace such as is referred to in the first claim, the use of covers
formed of sheet metal fitting over the opening of the cover plate, carried by
pivoted bars outside the furnace, which bars are connected by toggle levers to a
treadle lever with balance weight so that when melting the brazing metal the
covers are kept closed by the balance weight, while on depressing the treadle,
the covers are moved into the open position for the introduction of the objects
to be brazed, substantially as described.
3. In a melting furnace such as is referred to in the first claim, the arrange-
ment on the underside of the cover plate of descending walls reaching down to
near the edge of the crucible for preventing the fuel from falling in, and of
other descending partition walls at the narrow sides of the crucible, which walls
only reach partially down in the furnace chamber, and which are so arranged in
combination with the first named walls, as to insure a uniform distribution of
the flames and hot gases and cause these to pass over the top of the crucible
substantially as described.
4. The combination with a portable melting furnace such as is referred to in
the first claim, of a cooling jacket surrounding the furnace chamber, into which
jacket air enters at bottom, and from which it issues through openings formed
in the cover plate at top, substantially as described.
5. A portable melting furnace for brazing or soldering parts of cycle frames
and other objects, combined and operating as hercin described with reference to
the drawings.
Dated this 7th day of October 1800.
ABEL & IMRAY,
Agents for the Applicants.