An Improved Manufacture of Hollow or Tubular Metal Bodies.
Year: 1888

page_text: Date of Application, 19th Oct., 1888
Complete Specification Left. 3rd July. 1889-Accepted. 31st Aug.. 1889
PROVISIONAL SPECIFICATION.
An Improved Manufacture of Hollow or Tubular Metal Bodies.
I, WILHELM LORENZ of No. 44 Westendstrasse of Karlsruhe in the Grand Duchy
of Baden, German Empire, and Engineer and Manufacturer, do hereby declare the
nature of this invention to be as follows:-
This invention has for its object the manufacture, by pressing or drawing from metal
discs or shaped blanks, of tubular or hollow bodies having an internal transverse
partition.
The process which I employ for this purpose will be understood on reference to
Figs. 1 to 8 of the accompanying drawings, which shew by way of example the
manufacture of a simple tube with internal partition.
From a disc or washer Fig. 1 is formed in the first instance in the known manner
a cup A Fig. 2 with thick bottom a..
While this cup is supported in an inverted position within a suitable matrix by
a mandril B as at Fig. 3 the metal of the bottom is squeezed outward to the sides by
a tapering punch B₁ with slightly rounded end, so as to produce a double cup A¹ with
thin partition a'.
•
This double cup need not necessarily be produced by stamping or drawing out of
a disc as described; it can also be produced by casting in a suitable mould' or by
shaping out of a solid piece in a lathe.
This double cup forms, as it were, a blank for the following pressing and drawing
operations, for converting it into a double tube, or hollow body or tube with internal
partition. Such pressing and drawing may be effected either by a single operation or
by several consecutive operations, first on the one end and then on the other end, or
alternately on each end, so as to convert the double cup to a double tube of any
desired length and diameter.
Figs. 4 and 5 shew the part c of the douple cup extended by two drawings.
This is effected by forcing the cup by means of tapering punches into slightly
tapering matrixes, that are narrowed at bottom, the part of the double cup
being at the same time reduced in diameter by being pressed together, while the part c
is both reduced in diameter and made thinner as it becomes extended by its compres-
sion between the matrix and the punch in the known manner. The partition is not
subject to compression during these operations, but being pressed together in a lateral
direction, it is somewhat thickened, as will also be the case with the part c¹.
Fig. 6 shews the double tube Fig. 5 drawn out in a similar manner at the other
end, with further reduction of diameter, thinning of the sides c', and slight thickening
of the partition a'. Figs. 7 and 8 shew the double tube Fig. 6 further extended in
like manner at both ends, with further reduction of the diameter, thinning of the
sides c and c¹ and thickening of the partition a', which has not been subject to longi-
tudinal compression since its formation at Fig. 3.
C
The partition can now have any desired configuration imparted to it by compression,
such for instance as that shown at Figs. 9 and 10, or any other desired form.
Such double tubes can be applied to a great variety of purposes, or be further
operated upon. Thus at Fig. 10 the double tube is converted into a double box with
screwed ends closed by screw caps; at Figs. 11, 12 and 13 the double tube is con-
verted by expansion of the one end into various different forms, and at Fig. 14 both
ends are expanded, the one end being afterwards drawn in again, so as to produce a
vase like configuration.
Dated this 10th day of October 1888
ABEL & IMRAY,
Agents for the Applicant.

page_text: COMPLETE SPECIFICATION.
An Improved Manufacture of Hollow or Tubular Metal Bodies.
I, WILHELM LORENZ of No. 14 Westendstrasse of Karlsruhe in the Grand Duchy
of Baden German Empire, and Engineer and Manufacturer 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 :-
This Invention has for its object the manufacture, by pressing or drawing from
metal discs or shaped blanks, of tubular or hollow bodies having an internal transverse
partition.
The process which 1 employ for this purpose will be understood on reference to
Figures 1 to 8 of the drawings accompanying my Provisional Specification, which
shew by way of example the manufacture of a simple tube with internal partition.
From a disc or washer Figure 1 is formed in the first instance in the known manner
a cup A. Figure 2 with thick bottom a.
While this cup is supported in an inverted position within a suitable matrix by a
mandril B, as at Figure 3, the metal of the bottom is squeezed outward to the sides by
a tapering punch B₁ with slightly rounded end, so as to produce a double cup A' with
thin partition a¹.
This double cup need not necessarily be produced by stamping or drawing out of a
dise as described; it can also be produced by casting in a suitable mould or by
shaping out of a solid piece in a lathe.
This double cup forins, as it were a blank for the following pressing and drawing
operations for converting it into a double tube, or hollow body or tube with internal
partition. Such pressing and drawing may be effected either by a single operation or
by several consecutive operations first on the one end and then on the other end, or
alternately on each end, so as to convert the double cup into a double tube of any
desired length and diameter.
Figures 4 and 5 shew the part c of the double cup extended by two drawings.
This is effected by forcing the cup by means of tapering punches into slightly
tapering matrixes, that are narrowed at bottom, the part e¹ of the double cup being at
the same time reduced in diameter by being pressed together, while the part c is both
reduced in diameter and made thinner as it becomes extended by its compression
between the matrix and the punch in the known manner.. The partition is not subject
to compression during these operations but being pressed together in a lateral direction,
it is somewhat thickened, as will also be the case with the part c¹.
Figure 6 shews the double tube Figure 5 drawn out in a similar manner at the
other end, with further reduction of diameter, thinning of the sides c', and slight
thickening of the partition a¹. Figures 7 and 8 shew the double tube Figure 6 further
extended in like manner at both ends, with further reduction of the diameter, thinning
of the sides c and c¹ and thickening of the partition a¹ which has not been subject to
longitudinal compression since its formation at Figure 3.
The partition can now have any desired configuration imparted to it by compression,
such for instance as that shown at Figures 9 and 10 or any other desired form.
Such double tubes can be applied to a great variety of purposes or be further operated
upon. Thus at Figure 10 the double tube is converted into a double box with screwed
ends closed by screw caps; at Figures 11. 12 and 13 the double tube is converted by
expansion of the one end into various different forms, and at Figure 14 both ends are
expanded, the one end being afterwards drawn in again, so as to produce a vase-like
configuration.
Having now particularly described and ascertained the nature of my said Inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
1. The production of hollow bodies such as tubes, cases, boxes and the like with a
transverse partition from double cup shaped blanks substantially as herein described
with reference to Figures 3 to 14 of the drawings.

page_text: 2. The process for the production of hollow bodies such as are referred to in the
preceding claim, wherein a cup A. Figure 2 is formed. either by pressing casting or
cutting into a double cup shaped blank A. Figure 3 and the two cups C.C¹ of such
blanks are then extended to any desired length by subjecting them separately to one
or more drawing operations substantially as herein described.
Dated this 2nd day of July 1889.
ABEL & IMRAY.