Improvements in the Method and Dies for Forming Ornamental' Tubes or Tubular Cups.
Year: 1890

page_text: Date of Application, 8th Apr., 1890-Accepted, 10th May, 1890
COMPLETE SPECIFICATION.
Improvements in the Method and Dies for Forming Ornamental'
Tubes or Tubular Cups.
We, JOHN BURKHARDT, Machinist, and WILLIAM HENRY JACKSON, Manufacturer,
both of 31 East 17th Street, New York, in the County of New York and State of
New York, United States of America, do hereby declare the nature of the invention
of said John Burkhardt for. IMPROVEMENTS IN THE METHOD AND DIES FOR FORMING
ORNAMENTAL TUBES OR TUBULAR CUPS, and in what manner the same is to be
performed; to be particularly described and ascertained in and by the following.
statement:-
The object of this invention is produce ornamental metal tubes or tubular cups
by the use of dies of certain configuration. The metal is first shaped into tubular.
or similar forms, then reduced in circumference at several places throughout its
length, when it is placed between two pairs of dies at suitable distances apart' to
embrace one section or portion of such tubing which is between two of the lines
of its reduced circumference and then compressing the dies upon the embraced"
section of tubing axially, as herein more fully set forth.
In the drawings figure 1 represents a plain piece of metal tubing.; figure 2.,
represents said tubing with its diameter reduced at regular distances apart.
Figure 3 shows a vertical section of the tubing partly finished by this improved.
process and dies and exhibits one-half of two pairs of dies employed for the purpose,
and the open table of a press. Figure 4 represents a portion of tubing. finished.
Figure 5 represents a perspective view of one-half of the two sets of the dies:
detached. Figure 6 represents a plan or top view of a pair of the dies embraced
by removable clamps or yokes, and Figure 7 is a modified view of the parts repre-
sented in Figure 3 in vertical section, exhibiting the dies as closed and pressed.;
together.
The reduced diameter at any desired distances apart; or as shown in Figure 2,
may be obtained by the use of rolls of the proper configuration between which the
plain piece of tubing may be placed for reduction.
The piece of tubing similar to that shown in Figure 2 of the drawings, whether
the distances between the lines denoting reduction of the circumference be the same,
or vary in extent, the tube so reduced will be placed between two sets of dies A
and B, which will embrace the girdled tube (figure 2) and the open space between
said two sets of dies will depend on the dimensions of the globe or section of said tube
that will be between them on each occasion of their use as represented in Figure 3 at X.
Said dies will be closed together around the tube and secured by hinged yokes or
clamps CC, as shown in Figure 6. To assure accuracy of position of the dies upon
the tube and to guide them in their approach to each other, dowel pins, PP,
attached to one of the dies of each pair will enter corresponding holes formed in
the counter parts of the dies, and similar dowel pins S S, are employed to enter holes
in their counter parts to govern the action of the two pairs of dies as they are
forced together. The upper and the lower concavities, ii, of the respective dies are
made of proper shape and capacity to correspond with the size and figure of the
globular or oval sections of the tubing so that their use will not change the shape
or size of said sections above and below the working widened concavities J J, of the
respective pairs of dies.
The counter parts of the dies A B, are not shown except in Figure 6, where the
apper set of dies A, is represented within its yoke C. The form of the concavities J, of
one pair of the dies may be made to differ in shape or size from that of the other
pair, so that the upper and lower half of the section of tubing subjected to their
ction to enlarge the circumference by their use, will represent correspondingly

page_text: different shapes or sizes. That is to say, by varying the form of concavities J, of
the lower set of dies B, from the form of the concavities J, of the upper set of dies A
that section or globular portion of a tube upon which such dies will act will
necessarily be reduced to the configuration representing said different concavities
of the dies.
For instance, the lower set of dies may have concavities of the exact shape of
one-half of an acorn and the upper pair of dies may be of the conical shape of the
upper half of the acorn, and by similar variations of the dies ornamental designs in
great variety may be impressed upon sections of tubing to be used to embellish
different classes of artistic metal work.
When the two pairs of dies are placed around the prepared piece of tubing as
shown in sectional figure 3 and figure 6, the lower set of dies will be seated upon the
table D, of a press having an opening through which the tubing will extend, and the
upper pair of dies will be subjected to the downward action of the press, when both
pairs of dies will act and cause that portion of the tubing between them to be partially
flattened and its circumference will be enlarged as shown in figures 3 and 7, thus
reducing the globular form of the section embraced to an oblate form.
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed, we declare that what we
claim is :
1st. The herein described method or process of forming ornamental metal tubes
or tubular cups, consisting in first shaping metal into tubular or similar forms, then
reducing the circumference thereof at several places throughout its length, then
placing two pairs of dies around the tubing at the proper distance apart to embrace
one section or portion of such tubing that is between two of the lines of its reduced
circumference, and then compressing the tubing embraced by said dies between them
axially as set forth.
2nd. The two sets of dies, A B, provided with concavities, ii, and J J, in com-
bination with yoke C, for compressing spheroidal sections of tubing or metal globes
into oblate and analogous forms, as described.
Dated this 8th day of April 1890.
ALLISON BROS.,
Agents for the Applicants.