Year: 1896

page_text: I, HUGH OLFORD HARRIS, of 135 North 10th, Street, Brooklyn, Kings County,
New York, United States of America, Mechanic, do hereby declare the nature of
this invention to be as follows:-
This invention relates to a machine for reducing the thickness and outer
diameter of metal tubes and which permits cylindrical as well as tapering tubes
to be turned out.
The machine is built substantially on the plan of a lathe, to the live spindle
of which the work piece is adapted to be clamped.
The draw head connected to and reciprocating with the slide rest is provided
with a set of radially adjustable slides carrying reducing rolls on their inner ends,
between which the draw hole is formed. The slides are radially movable within a
grooved disk carried within the draw head, and by means of laterally projecting pins
engage cam grooves on a second disk, by the oscillation of which the slides are set
to increase or diminish the diameter of the draw hole. An arm on the oscillating
disk engages and is guided along a longitudinal rail vertically adjustable at either
end by means of set screws. If this rail is placed horizontally, cylindrical tubes
will be drawn, but if the rail is placed in an inclined position, the reducing rolls
will recede gradually during the motion of the draw head, to form tapering tubes.
To the draw head there is connected by means of a plate or spider, a mandrel
which is adapted to project with its free end into the work piece. This mandrel
should be made revoluble and have an enlargement or head in line with the
reducing rolls, so that it will not bind. The mandrel by being connected to the
draw head, will participate in its to and fro motion and will consequently be
gradually drawn through the tube as the latter is being reduced, so that it need
not be separately removed. Thus the machine can accomplish a large volume of
work, requires but little attention, and works with a minium amount of
friction.
Dated this 2nd day of October 1896
ALLISON BROS.,
Agents for the Applicant.

page_text: declare the nature of this invention and in what manner the same is to be per-
formed, to be particularly described and ascertained in and by the following
statement:-
This invention relates to a machine for reducing the thickness and outer
diameter of a metal tube in a quick, and effective manner. The machine is so
constructed that friction is greatly reduced and that metal tubes of cylindrical
and also of tapering form may be turned out.
In the accompanying drawings, Fig. 1 is a side elevation, partly in section,
of my improved machine for reducing metal tubes; Fig. 2, a face view of the
draw-head, with the disk d removed; Fig. 3, an inner face view of the disk d;
Fig. 4, a horizontal section on line 4, 4, Fig. 1; Fig. 5, an enlarged side view of
the bulb and mandrel with the tube A, in section, and Fig. 6 a detail of the bulb
and mandrel.
The letter a, represents the frame of the machine, of which a', is the head-
stock and the live-spindle which is driven from the step-pulley a", in the
manner usual in lathes. The tube A, to be reduced is adapted to be connected to
the spindle a, by means of a clamp or chuck at, so as to be axially revolved
thereby.
b is the slide-rest, which is reciprocated in the ordinary manner by connec-
tions b1, b2, and carries the annular draw-head c, which is adapted to encircle the
work A. To the draw-head e, there is secured a fixed disk d, provided with four
(more or less) radial ways or grooves . Within these grooves there are guided
the radially-movable slides e, to the inner ends of which the reducing-rolls e¹,
are pivoted. These slides are provided, moreover, with the laterally projecting
pins, engaged by the cam-grooves f, of a second or oscillating disk, between
which and the disk d, the slides e, are confined.
It will be seen that when the disk f, is oscillated the slides will thereby be
forced either inward or outward along the ways d', so as to decrease or increase
the diameter of the draw-space formed between the rolls e'.
..In. order to oscillate the disk f, it is provided with an arm f, carrying a loose
grooved roller P. This roller engages and is guided along a longitudinal rail g,
which is vertically adjustable at either end." To effect this adjustment, the
slotted ends g', of rail g, are connected to blocks A, by means of "bolts A', and
winged nuts h. Each of the blocks h, is engaged by a pair of set-screws ¹, 23,
turning in standards i, of the machine frame.
In order to raise or lower either end of rail g, the nut 4, is slackened, the
block h, adjusted by a turn of the set-screws, and the nut again tightened up to
lock the rail in its new position.
It will be seen that by lowering the rail g, the arm f, will be depressed and
the disk f, swung downward to move the slides e, inward. On the other hand,
by raising the rail g, the arm f, will be liberated, so that the frictional contact
between the work and the rolls e¹, will cause the disk f, to be swung upward and
the slides e, to be moved outward until the roller f3, again contacts with the rail.
By raising the right hand end of the rail g, slightly above the left hand end this
outward movement of the slides will be effected gradually during the travel of the
draw-head from left to right, and in this way the diameter of the draw space will
be gradually increased to form tapering tubes.
To the draw-head e, there is secured, by means of rods k, and a plate or spider,
one end of mandrel j, which is adapted to be projected with its free end into the
tube A, to be drawn. This free end carries a head or a loose bulb j', which is
placed centrally between the reducing-rolls e, so that. the distance between the
bulb and rolls represents the thickness to which the tube A, is to be reduced.
The head on, the mandrel permits the work to he readily drawn off, and by making
the working face of the mandrel revoluble, friction is to a great extent avoided.
The operation of the machine is as follows:
The tube A, to be reduced is connected to the live-spindle by clamp a, so as

page_text: to be axially revolved. The draw-head c, is moved to the left and the rail g,
adjusted to form a draw-space of the desired width. Motion being imparted to
the slide-rest, the draw-head is made to travel along the tube so as to subject each
portion thereof to the action of the reducing-rolls. These rolls, as well as the
bulb j, will be revolved by frictional contact with the tube A, and will thus
reduce its thickness in a quick and uniform manner.
The principal advantages connected with my invention are that the machine
can be accurately adjusted to form cylindrical and tapering tubes of any desired
thickness and that the machine works with a minimum amount of friction.
Having now particularly described and ascertained the nature of my said in-
vention, and in what manner the same is to be performed, I declare that what I
claim is :-
1. In a machine for reducing metal tubes, the combination of a reciprocating
draw-head with radially-adjustable slides that form the draw-hole, and a mandrel
secured to and longitudinally movable with the draw-head, substantially as
specified.
2. In a machine for reducing metal tubes, the combination of a reciprocating
draw-head, with a disk d, having radial grooves d, a disk f, having cam-
grooves f¹, a series of radially movable slides e, having reducing-rolls e¹, and
pins e³, and a mandrel which is secured to the draw-head and projects with its
free end between the rolls e¹, substantially as specified.
3. In a machine for reducing metal tubes, the combination of a reciprocating
draw-head with radially movable slides, an oscillating disk having cam-grooves
engaging the same, a rail for locking the disk, a mandrel secured to the draw-
head, a live spindle, and means for attaching the work to such spindle, substan-
tially as specified.
4. In a machine for reducing metal tubes, the combination of the following
elements: a reciprocating draw-head, a fixed disk having radial grooves, an
oscillating disk having cam-grooves, slides engaging the disks, a mandrel secured
to the draw-head, a rail engaging the oscillating disk, means for adjusting said
rail, a live-spindle and means for locking the work to such spindle, substantially
as specified.
5. A machine for reducing metal tubes constructed and operating substantially
as herein shown and described.
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