Year: 1899

page_text: Date of Application, 10th Jan., 1899-Accepted, 18th Mar., 1899

page_text: In front of the first pair of rolls b, there is arranged a spring-actuated presser
foot f, having presser roll f, above base plate (Fig. 4) and mounted in a
bracket f, bolted to the machine frame. The roll f, is adapted to firmly hold the
upper work blank against the lower work blank, so as to prevent buckling.
9,9, are a pair of laterally adjustable gauges, adapted to be held in position
by eccentrics y, or otherwise, and notched at their inner edges (Fig. 3) to
accurately fit and center the two layers of the blank.
Between the rolls c, and the rolls d, there is placed a fixed funnel-shaped former
or conductor h, the sides of which converge to form a circular draw hole h¹.
The operation of the machine will be readily understood. A strip of steel or
other metal A, which is to form the core is placed upon a wider strip of brass or
other metal B, which is to form the covering (Fig. 5) and the compound blank
thus formed is centered by the gauges g, and drawn beneath presser roll, between
rolls b, c, through draw hole ', and between rolls d, by the power applied to either
one of the rollers e.
The strips will be so centered by the gauges g, that a margin B, of equal width
will be formed along the two edges of strip A, by the projecting ends of strip B.
This margin is first turned up by the rolls b, (Fig. 7) to form an upright or
approximately upright flange, and then the rolls c, fold or lap this flange flat
upon the face of strip A, (Fig. 8) to intimately connect the two layers of the blank.
The compound blank thus united is next passed into and through the draw hole
of the conductor h, (Fig. 9) to be rolled into an approximately circular form,
which rolling operation is completed by the rolls d, (Fig. 10).
The grooved feed rollers e, serve not only to draw the tube through the machine,
but also to impart its final shape to it, so that after the tube leaves such rollers,
it has acquired the form shown in Fig. 11.
From this figure it will be seen that the tube is composed of a slotted tubular
core and of a surrounding tubular shell, the flanges of which project through the
slot into the hollow of the core. These flanges are shown to be sprung slightly
off the inner side of the core, which is due to the strain resulting from the draw-
ing operation. The tube after leaving the machine is ready to be brazed on its
open joint, and to be finally drawn through a hardened steel die to give it a
finished surface.
It will be seen that by this machine a compound metal tube is produced from
two metal strips in one operation, so that the manufacture of the tube is con-
siderably cheapened, and the output largely increased.
Having now particularly described and ascertained the nature of the said
invention, as communicated to me by my foreign correspondent, and in what
manner the same is to be performed, I declare that what I claim is:-
1. A machine for making metal tubes which consists of means for lapping the
margin of one metal strip around the edge of another metal strip, and means for
rolling the compound blank thus formed into tubular form, substantially as
specified.
2. A machine for making metal tubes which consists of grooved rolls for flang-
ing the margin of one metal strip, grooved rolls for lapping such flange upon the
face of another metal strip, and of means for rolling the compound blank thus
formed into tubular form, substantially as specified.
3. A machine for making metal tubes which consists of a presser foot adapted
to bear upon a pair of superposed metal strips, means for lapping the margin of
one metal strip around the edge of another metal strip, and means for rolling the
compound blank thus formed into tubular form, substantially as specified.
4. A machine for making metal tubes which consists of a presser foot adapted
to bear upon a pair of superposed metal strips, grooved rolls for flanging the
margin of one metal strip grooved rolls for lapping such flange upon the face
of the other metal strip, a funnel-shaped former, and a pair of grooved rolls
adapted to engage the work after emerging from such former, substantially as
specified,

page_text: 5. A machine for making metal tubes which consists of a centering gauge, a
presser foot, a set of flanging rolls, a set of upsetting rolls, a funnel-shaped former,
and a pair of grooved rolls adapted to engage the work, after emerging from such
former, substantially as specified.
6. In a machine for making metal tubes, the combination of a pair of laterally
adjustable flanging rolls with a pair of laterally adjustable upsetting rolls, a
funnel-shaped former, a pair of laterally adjustable shaping rolls, and a pair of
power rollers, substantially as specified.
An improved machine for making metal tubes, substantially as horein shown
and described.