Year: 1886

page_text: connect each coil with the next succeeding one in each strip, but also to connect
the one spirally wound strip to the other, the solder between the two constituting
of itself an intermediate solid tube.
In the drawings, one of such strips is shown at A and the other at B, as
they appear in course of being wound one upon the other and both about a
mandrel C.
The said mandrel, as represented, is tubular and at one end is fastened to that
of a long guide rod D, which has bearings in a poppet E and a headstock F, which
extended over a toothed rack G, fastened to the poppet-are supported on suitable
ways, so as to be capable of rectilinear movements in a frame H. The mandrel
is collapsible to admit of the tube being withdrawn from it. To this end the
mandrel is in three sections a b and c; the two sections a and b being hinged to
each other at their lower edges, as shown at d (see Figs. 2, 6, and 7) At their
upper edges the said parts a and b are rabbeted transversely and are tapered
lengthwise to receive and support the intermediate portion c, which is not only
dovetailed in transverse section, but is tapering longitudinally as represented. The
said part c is provided with mechanism for drawing it backward a sufficient
distance, to allow of the sections a and b being moved toward each other far
enough to enable the made tube to be readily drawn off the mandrel. This
mechanism consists of a screw d¹, that screws through a bracket e projecting
inwardly from the section b such screw being journalled in an ear f¹ extending
from the section c. On applying a wrench or a crank to the screw and revolving
it, the section c may be drawn backward, and afterward impelled forward.
The mandrel is supported by two rollers h, sustained by a frame &, which in
turn has screws k, for adjusting it in altitude to fit the rollers to mandrels varying
in diameter, according to the diameters of tubes to be made by the machine. The
mandrel extends across a tank I, that is situated over a furnace K for heating it,
such tank being to hold the solder used in connecting the spirally wound strips.
The two opposite sides of the tank have segmental notches in them to allow of the
mandrel dipping a short distance into the tank in order for the solder to reach up
to and high enough upon the mandrel. Stuffing boxes are applied to the sides
of the tank and against the mandrel to prevent waste of the solder, asbestos being
used for the packings of such boxes.
Aside of the tank I and extending below it, as shown, is an auxiliary tank L
see Fig. 4. A bent spout m is journalled in the partition n between the tanks
On
at an altitude lower than either of the notches in the sides of the tank I.
turning the said tube downward, melted solder in the main tank may be dis-
charged into the auxiliary one until the level of the mass of solder in the main
tank shall be below the said notches. Were it not for the auxiliary tank and the
said discharge tube, there would be an escape of solder through the notches on
removal of a made tube from the mandrel. In the place of the said discharge
tube, a single waste cock might be used.
To get the solder from the auxiliary back into the main tank, an ordinary
lifting or forcing pump may be employed, such a pump being shown at M in
Figs. 1 and 2 the handle or lever for working such pump being represented at o.
The mandrel is further supported by a set of four adjustable rollers, arranged as
shown at pp etc. in Figs. 1, 2, 3 and 4 and such mandrel has applied to its
guide rod, mechanism for revolving both mandrel and guide rod and moving
them longitudinally, to cause the metallic strips to be properly wound about the
said mandrel.
The strips are led to the mandrel through two troughs or guides N and O having
in each a pressure roller q to rest and revolve upon the strip, such roller being
provided with means of adjusting it in altitude relatively to the bottom of the
guide, as the thickness of the strip may require.
The rod D has a spline or feather connection with the hub r of a bevel gear 8
arranged on or with the rod as shown in Figs. 1 and 3. The gear disposed in the

page_text: head stock F engages with another such gear t, fixed on a shaft u, journalled in a
box v, fastened on the said head stock. The shaft u carries a pinion w, that
engages with a spur gear y by means of an intermediate gear x see Figs. 1, 2 and 5.
The gear y is carried by a shaft z, upon which is fixed a worm gear a³, that engages
with a worm or screw b¹ fixed upon a shaft c', provided with a driving pulley d¹,
all being arranged as represented. The shaft carries a pinion e¹, that engages
with the rack G, herein before mentioned.
On the pulley d¹ being revolved, not only will a slow rotary motion be imparted
to the mandrel, but such inandrel will be moved in a direction lengthwise of it.
The furnace K rests upon a plate P provided with screws R R for adjusting it
and the soldering tanks in altitude relatively to the mandrel-such screws being
shown in Figs. 2, 3 and 4, as screwed through bosses S S fixed to the frame H.
TT are two arched standards projecting upward from the said frame H. In one
of these standards are curved slots f¹ through which are extended the fastening
screw bolts gemployed to secure to the standard the carriers h¹, that sustain the
rollers p, see Figs. 1, 2 3, and 4, each carrier being slotted length wise of it, as
shown at i¹.
Below the mandrel is a pipe or pipes p' provided with a series of gas jets q¹ or
means of discharging from the pipe gas, such as, when inflamed, will heat the
mandrel in order for it, in passing through the solder, to be at a proper temperature
to prevent prematurely setting of the solder.
To use the machine, a person is first to fasten to the mandrel the strip A at or
near its inner end, after which the mandrel is to be revolved once, it being moved
endwise in the meantime so as to cause the strip to be coiled once upon it. Next
the other strip is to be fastened at or near its inner end, to the mandrel and is to
be arranged to lap on the first strip in a manner to cause the spiral joint between
the coils of the said first strip, as produced, to be covered by the coils of the second
strip, as they are made. The outermost strip passes through the solder, and so does
the innermost strip. The solder not only flows between and unites them in the
course of their being coiled, but at the same time extends into the spiral joint
between the coils of each and fills it and joins each coil to that next to it. In each
revolution of the mandrel, it is advanced a distance sufficient to cause each coil of
each strip to lay closely against the next preceding coil of such strip.
In order to reduce the temperature of the mandrel sufficiently, as it may pass
from the tank of solder, I make use of a blower U and a pipe or educt V extending
from its case to the part of the mandrel, immediately in advance of the tank. By
discharging upon this portion of the mandrel and the tube encompassing it a blast
of cool air, the setting of the solder will be ensured.
Having now particularly described and ascertained the nature of this inven-
tion, and in what manner the same is to be performed, I declare that what
I claim is:
1) The machine substantially as specified, composed of the mandrel, provided
with mechanism for supporting it, revolving it transversely and moving it endwise,
as described, the two strip guides and the soldering tank and its furnace, arranged
with such mandrel and to operate therewith, essentially as set forth.
2) The combination of the mandrel, provided with mechanism for supporting it,
revolving it transversely and moving it endwise, as described, the two strip guides
and the soldering tank and its furnace, with the auxiliary tank arranged with and
to extend below the main tank-such tanks being furnished with a tube or educt
for discharging solder from the main into the auxiliary tauk, substantially and for
the purpose as set forth.
3) The combination of the mandrel provided with mechanism for supporting it,
revolving it transversely and moving it endwise, as described, the two strip guides
and the soldering tank and its furnace with the air blower and its educt, arranged
and to operate with the said mandrel, substantially as set forth.

page_text: 4) The mandrel essentially as described, composed of the hinged and rabbeted
sections a and b, and the dovetailed and tapering section c arranged as represented,
and having to the latter section, mechanism for moving it endwise between the
others, as set forth.
5) The combination of the mandrel, provided with mechanism for supporting it,
revolving it transversely and moving it endwise as described, the two strip guides
and the soldering tank and its furnace with supplementary means of heating the
mandrel as and for the purpose specified.