Wing Furnaces.
Year: 1888

page_text: Date of Application, 5th June, 1888
Specification Accepted, 5th Oct., 1888
пргоѵошены шада обпдесeu WIL
Wing Furnaces.
I, SYDNEY PITT, of Sutton, in the County of Surrey, Gentleman (a communication
to me from abroad by Thomas F. Rowland, of the City, County and State of
New York, and Warren E Hill and Angus McLachlan, both of Brooklyn, Kings
County, New York Engineers) 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 improvement relates to machines for welding seams, and especially for welding
together the edges of metallic tubes. By means of it the edges of tubes of large
diameter can be successfully welded The improvement consists in a process of
welding and mechanism for carrying the same into effect. The essential part of the
invention consists in two welding furnaces, by preference gas furnaces, adapted to be
brought within and without the seam to be welded and in juxtaposition to each other,
and likewise to be withdrawn and moved out of the way when requisite. I have
discovered that it is essential to thoroughly mingle the gas and air before they come
to the point where they are to do their effective heating.
What I desire to claim as new is specified in the claims following this specification.
The invention will be readily understood from the accompanying drawings, in
which
Figure 1 represents an end view of the apparatus in position to weld a boiler
furnace.
Figure 2 a side view of the same showing the tube partly broken away.
Figure a top view of the same
Figures 4, 5, 6 and 7, details of the welding furnace
The body to be welded, which may be of any desired shape, and I have shown a
cylinder in process of welding, is mounted, preferably in a pit or depression below the
general level of the floor, upon a carriage.
A represents the cylinder to be welded and V the carriage for supporting the same.
This carriage can be moved longitudinally on rails, as shown, and the cylinder is
supported upon rollers W permitting of its rotation The welding is done by the gas
furnaces B, C, which heat the cylinder within and without, as shown. As soon as a
portion of the cylinder has been heated to the welding heat, the carriage is run forward
Гр

page_text: so as to bring that part over the welding anvil D, which can be depressed and raised
as shown by the mechanism shown lowered in dotted lines Any suitable anvil, of
course, can be employed, or welding rollers can be substituted. The anvil being raised
beneath the heated portion, the weld is then made by hammers in the usual way, when
the carriage can be run back and another portion heated.
The principal novelty of this invention consists in the peculiar construction and
method of mounting of the welding furnaces The furnaces B, C, are mounted upon
the swinging arms E, F, counterbalanced by weights G H These arms, of course,
are made of suitable length They are supported near their centre of gravity upon
vertical pivot X around which they are free to turn horizontally This pivot X is
carried upon the over-head track by a carriage as shown, and by the block and fall
can be vertically adjusted.
The furnace B is slightly under-balanced by the weight G, and the furnace C is
slightly overbalanced by the weight H so that these furnaces tend to come together
when free so to do. It will be observed that by the construction shown, the furnaces B, C,
when the arms E F are parallel are necessarily over each other, so that no
longitudinal adjustment is necessary The furnaces are fed with gas and air through
separate pipes The upper furnace B is fed by the air pipe O and the gas pipes N N.
They are, of course, provided with flexible connections to allow of the swinging
of the furnaces The furnace itself consists of a casing of iron containing a mass of
refractory material, for instance, fire brick, within it. The pipe N branches, as shown.
into two pipes N N, each of which is provided with three vertical pipes P, which, in
the furnace B, are at right angles to the movement of the carriage. The pipe O
enters the air chamber formed above the fire brick, as shown, and this chest is filled
with the compressed air. Each of the pipes P is surrounded by a larger pipe R, all
of which pipes P P P P P P, RRRRRR, deliver into the mixing chamber S,
substantially square in section The lower part of this chamber is provided with a
burner T, preferably made somewhat flaring. It is oblong in section, and its longer
section is substantially parallel with the line of movement of the carriage. The con-
struction of the lower furnace C is substantially the same excepting that in this case
the air and gas pipes L enter from the end of the cylinder. The air pipe L delivers
into the lower air chamber as before. The branch pipes M deliver through six pipes Pi
into the mixing chamber S, and these pipes P¹ are surrounded with the pipes R¹, as
shown.
In Figure 6, part of the furnace C is shown in section
In Figure 7, the burner T¹ is shown more in detail This burner T¹ connects with
the mixing chamber S¹. as shown, the-same way as the burner T connects with the
mixing chamber S
The operation of the apparatus will be readily understood. The cylinder A being
placed on the carriage V, the furnaces B, C, which at that time are run back on the
track J, are run forward by means of the carriage K, after being properly lighted, and
are separated by bringing the weights G H together so that they will pass without
and within the cylinder A. They are then allowed to come together, and the furnace
is heated by means of the gas and air injected.
The mixing chamber S with the entering tubes is so constructed as to thoroughly
mingle the air and gas there, while the effective heating does not take place until the
mixture gets to the burner T This arrangement is found to be essential to make a
proper weld. It will be observed that the air and gas pipes deliver in the chamber at
one side of the burning orifice, so as to ensure a mingling in that chamber before
the gas escapes through the burner.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is
-
1. The combination in a welding furnace of two gas burners B C pivotted upon
the same pivotal support, thereby enabling them to be brought one over the other,
substantially as described.

page_text: 2 The combination in a welding furnace of the gas burners B. C. carried upon
the same pivotal support X, and mechanism for moving them longitudinally,
substantially as described
3. The combination of the pivotted gas burners B. C the carriage V, and the
welding mechanism D, substantially as described.
4. The combination of the gas burners B. C. carried by arms E F, supported by
vertical pivot X carried by carriage K on rail J, substantially as described
5. The combination of a welding furnace of air pipe R, gas pipe P, mingling
chamber S, and oblong burner T, substantially as described.
6. The combination in a welding furnace of an air-chamber connecting with the
pipe O and pipes P, the double pipes P and R, the mingling chamber S, and burner T,
substantially as described.
7. The combination in a welding furnace of two gas burners and mechanism for
bringing them together within and without the tube or body to be welded, and a
carriage for supporting such tube and moving it longitudinally between the gas
burners, substantially as described.
8. The combination of two welding gas burners, and mechanism for moving them
longitudinally, and a carriage for supporting the tube or body to be welded, and
capable of longitudinal motion in the same direction as the motion of the gas burners,
substantially as described.