Improvements in the Manufacture of Hollow Ornamental Studs, Balusters, Pedestals, and similar Articles.
Year: 1888

page_text: Improvements in the Manufacture of Hollow Ornamental Studs,
Balusters, Pedestals, and similar Articles.
We, JOHN BURKHARDT, Machinist, and WILLIAM HENRY JACKSON, Manufacturer,
both of 31 East Seventeenth Street in the City and State of New York, United States
of America, 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 :—
In the drawings forming a part of this specification Figure 1 represents a
perspective view of a baluster or pedestal, formed of tubing by our new method and
imechanism.
Figure 2 represents a perspective view of a section or piece of tubing embraced
by a yoke, or pillar-block, in readiness for the action of a pair of dies to be operated
by a power-press.
Figure 3, represents a vertical section of a pair of dies, the clamping yoke shown
in Figure 2 and a piece of tubing, and exhibits the form to which the latter is reduced
by the first compression and pair of dies.
Figure 4, is a vertical central section of the tube, the yoke, and a different pair of
dies, and shows the form of the completed pedestal after the action of the modified
dies thereon, which is also shown in figure 1.
Figure 5 represents a modified form of a lower die, to be used with one of the dies
shown in figure 4, for the reduction of a short tapering piece of tubing to the shape
of the pedestal represented in figure 6, as supporting a globe.
Figure 7, represents a side elevation of the baluster or a stud as supporting a part
of a grate fender, mounted with globes or balls.
Our present invention relates to the subject of formning ornamental metal sphereoidal
bodies from tubing described in our application for a patent of even date herewith
numbered 3288; and the product thereof is intended to be used in connection with
the articles designated in said application.
In the drawings A, denotes a piece of metal tubing, embraced by a clamping yoke
or collar, formed in two parts or jaws B, C, and secured by the hinged removable
clasping bars D.

page_text: E E' are a pair of dies made with central cylindrical projections a, and an annular
recess d, with rectangular shoulders; and HH' denote a pair of dies similar to
dies E, É¹, excepting that instead of being formed with rectangular shoulders, the
outer shoulders are rounded to form a quarter circle as shown in Figures 4 and 5.
The interior of the yoke B C may be either cylindrical or of tapering form or
increasing in diameter from the center of the opening to the ends through which the
ends of the tube A project, and thus made said interior will correspond in form with
the shape indicated by dotted lines in Figure 1.
By the use of the die H, and the modified die J (figure) the pedestal K
(figure 6) may be formed from a tapering piece of tubing.
To form balusters or pedestals by the use of the mechanism described above, the
upper dio E, will be attached to the slide or plunger of a power press and its counter
die E will rest upon the platen or seat of the press, directly under the die E; and
the piece of tubing embraced by yoke B, C, will be placed in a vertical position
between the dies resting in die E as seen in the drawings.
The first downward imovement of the die E, actuated by the press, will be limited,
either by a suitable stop, or by the manipulation of the operator, to arrest the descent,
after having formed by compression the collars or rings i, i, directly above and below
the yoke B, C.
At this stage of the process dies H H will be substituted in place of dies E E' and
a second operation of the press will be made in like manner; and this second
compressive action upon the tube A will cause the dies H H¹ to form the collars g, g
around the ends of the tube A, completing the article. The body of the tube A,
between the two collars i, i, will by the compressing action, be forced into the form of
the interior of yoke B, C.
It should be observed that the compressive force upon the piece of tubing will cause
the collars or rings, formed simultaneously thereby, to be of corresponding shape and
size at each end of the stud, pillar, or pedestal; of course one collar may be formed
at one end of the stud and two or inore at the other end.
Having now particularly described and ascertained the nature of our said
invention, and in what manner the same is to be performed we declare that what
we claim is :
First. The method herein described of forming studs, balusters, pedestals, and
similar articles, which consists in first forming the metal into a tube then placing the
tube into a yoke or a clamp B, C., then placing the tube with the yoke around it
between annular dies E E' and compressing it, forming the collars or rings i, i, and
then placing the tube with the yoke around it between the dies H, H' and compressing
it between them forming the collars g, g, around the ends of the tube and at the same
time compressing the central portion of the tube into the form of the interior of the
yoke or clamp B, C.
Second. A hinged yoke or pillar-block formed in two parts B, C, in combination
with dies for operating longitudinally by compression, upon a section of metal tube,
in the process above set forth, to change the shape of such tube, for the uses mentioned,
or for analogous purposes.