Improvements in the Manufacture of Tubes of Yielding Material, such as Lead or Tin, and in Apparatus therefor.
Year: 1894

page_text: Date of Application, 5th Apr., 1894
Complete Specification Left, 17th Apr., 1894-Accepted, 10th Nov., 1894
PROVISIONAL SPECIFICATION.
Improvements in the Manufacture of Tubes of Yielding Material,
such as Lead or Tin, and in Apparatus therefor.
I, MAURICE BLOCH, of 8 Bethanien Ufer, Berlin, in the Empire of Germany,
Merchant, do hereby declare the nature of this invention to be as follows:-
My invention relates to the filling of tubes of yielding material such as lead or
tin during their manufacture, and to apparatus therefor.
In order that tubes made of yielding material, such as lead or tin, may be easily
bent without being dented, it is usual to fill the tubes in question, after they are
manufactured, with a material which sets and is easily fusible. It frequently
bappens, however, that air bubbles remain in the material so introduced, the result
being that if they happen to lie at the point at which the bending is to be carried
out, the tube becomes indented in the process of bending, in spite of the filling.
The object of my invention is to overcome this disadvantage.
The invention is carried out by closing the end of the tube as it issues from the
press so as to produce a vacuum in the further process of manufacture, into which
vacuum the filling material is subsequently sucked up.
In carrying out the invention there is made use of either a reservoir to contain
the filling material, to which reservoir a hollow mandrel is connected, in such a
way that the filling material is drawn into the tube through the hollow mandrel in
the process of pressing, or there is a chamber in the body of the piston of the press
itself for the reception of the filling material.
In the former case in the chamber for the reception of the fluid lead, or other
substance, enters a pressure piston which is in connection with a hydraulic piston.
The matrix is formed in the wall of this chamber, and the hollow mandrel enters
the latter on one side, the mandrel being connected with the reservoir for the filling
material by a tube.
The chamber for the lead is firmly connected to the cylinder of the hydraulic
piston by means of bolts.
The fluid lead being introduced into the chamber and the liquid filling material
into the reservoir the pressure piston is advanced by the hydraulic piston.
The lead, or other metal, then issues from the matrix in the form of a tube.
When a sufficiently long piece of tube has been manufactured, its end is closed by
tongs or other means so as to be air-tight. As the advance of the pressure piston
is continued, the liquid filling mass is drawn out of the reservoir through the
hollow mandrel in consequence of the vacuum which is produced in the latter and
in the tube, and the mass fills the latter until the stock of mass in the reservoir and
mandrel is exhausted.
If it be desired to manufacture a tube of very great length, a subsequent filling
is effected after the return of the piston at the proper moment. With this end a
filling screw is provided on the chamber.
In the second case the pressure piston which is elsewhere solid has at its upper
end an excavation into which, nearly as far as its floor, the hollow mandrel passes.
A collar furnished with a screw-thread is secured upon the mandrel and on the
collar is screwed a plate which lies upon the upper end of the piston and closes
the opening. In this case too the metal-chamber is in firm connection with the
hydraulic cylinder by means of bolts.
The chamber is filled with a liquid-setting mass, then the plate which carries the
hollow mandrel is put on, and next the fluid lead or other metal is poured into the
space which is left above the plate. A press ring or matrix is then inserted
and a cover is screwed upon the chamber.

page_text: If the pressure piston be now caused to move upward by the hydraulic piston,
the lead or other metal issues from the matrix in the form of a tube, and when a
sufficient length has been made, the end is closed by means of tongs or the like so
as to be air-tight, as described before.
This method and the appliances by means of which it is carried out are capable
of being used in any case in which it is required to manufacture tubes filled with
a mass.
Dated the 5th day of March 1894.
C."
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in the Manufacture of Tubes of Yielding Material,
such as Lead or Tin, and in Apparatus therefor.
I, MAURICE BLOCH, of 8, Bethanien Ufer, Berlin, in the Empire of Germany,
Merchant, 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:-
My invention relates to the filling of tubes of yielding material such as lead or
tin with other substances or ingredients during their manufacture, and to apparatus
therefor.
In order that tubes made of yielding material, such as lead or tin, may be easily
bent or curved to desired forms without being dented, it is usual to fill the tubes in
question, after they are manufactured, with a material which sets and is easily
fusible. It frequently happens, however, that air bubbles remain in the material
so introduced, the result being that if they happen to lie at the point at which
the bending is to be carried out, the tube becomes indented in the process of
bending, in spite of the filling. The object of my invention is to overcome this
disadvantage.
The invention consists in closing the end of the tube as it issues from the
press so as to produce a vacuum in the tube as the process of manufacture
proceeds, which causes the filling material to be subsequently sucked up, and
completely fill the interior space.
In carrying out the invention there is made use of either a reservoir to contain
the filling material, to which reservoir a hollow mandrel is connected, in such a
way that the filling material is drawn into the tube through the hollow mandrel
in the process of pressing, or there is a chamber in the body of the piston of
the press itself for the reception of the filling material.
To enable my invention to be fully understood 1 will describe the same by
reference to the accompanying drawing, in which :-
Figure 1 is a vertical section of apparatus suitable for the manufacture of tubes
of yielding material such as lead or tin according to my invention, the pressure
piston of the tube-press working outward and the latter being provided with an
upper reservoir for the reception of the filling material, the reservoir being
connected to the hollow mandrel; and,
Figure 2 is a similar view of a modification in which a chamber in the piston
itself serves for the reception of the filling material, the hollow mandrel projecting
into this chamber.
In the former case (illustrated in Figure 1) in the chamber f for the reception of
the fluid lead, or other substance, enters a pressure-piston a which is in connection
with a hydraulic piston i. The matrix g is formed in the wall of this chamber, and
the hollow mandrel e enters the latter on one side, the mandrel being connected
with the reservoir b for the filling material by a tube.
The chamber for the lead is firmly connected to the cylinder of the hydraulic
piston by means of bolts k¹.

page_text: The fluid lead being introduced into the chamber fand the liquid filling material
into the reservoir b the pressure-piston a is advanced by the hydraulic piston i.
The lead, or other metal, then issues from the matrix g in the form of a tube.
When a sufficiently long piece of tube has been manufactured, its end is closed by
tongs or other means so as to be air-tight. As the advance of the pressure piston a
is continued, the liquid filling mass is drawn out of the reservoir b through the
hollow mandrel c in consequence of the vacuum which is produced in the latter and
in the tube, and the mass fills the latter until the stock of mass in the reservoir b
and mandrel c is exhausted.
If it be desired to manufacture a tube of very great length, a subsequent filling
is effected after the return of the piston at the proper moment.
With this end in
view a filling-screw is provided on the chamber f.
In the second case (illustrated in Figure 2) the pressure piston a which is
elsewhere solid has at its upper end an excavation b into which, nearly as far as its
floor, the hollow mandrel c passes. A collar d furnished with a screw-thread is
secured upon the mandrel and on the collar is screwed a plate e which lies upon the
upper end of the piston and closes the opening into the reservoir b.
In this case
too the metal chamber f is in firm connection with the hydraulic cylinder by means
of bolts k¹.
The reservoir is filled with a setting mass heated to a liquid condition then the
plate which carries the hollow mandrel c is put on, and next the fluid lead or other
metal is poured into the space which is left above the plate e. A press ring or
matrix g is then inserted and a cover his screwed upon the chamber f
If the pressure-piston a be now caused to move upward by the hydraulic piston i,
the lead or other metal issues from the matrix g in the form of a tube, and when a
sufficient length has been made, the end is closed so as to be air-tight, as described
before. The mandrel c moves with the piston but the tube is produced faster than
the mandrel moves and the vacuum in the closed tube sucks up the liquid filling
mass from the reservoir b.
This method and the appliances by means of which it is carried out are capable
of being used in any case in which it is required to manufacture tubes filled with a
mass such as in the manufacture of tubing in continuous lengths from soldering
material and filled with a suitable flux.
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 iş:-
1. A process for filling tubes manufactured by pressure whilst in process of
manufacture, by closing the end of the tube as it issues from the press so as to be
air-tight, for the purpose of causing a vacuum in the tube as the manufacture of
the latter is continued, whereby the filling mass in a liquid state is drawn into the
space in the tube so closed at its end, substantially as hereinbefore described.
2. The combination with a press for making tubes of yielding material such as
lead, tin or the like, of a hollow mandrel entering the matrix through which the
filling mass in a liquid state is drawn into the tube and of a reservoir connected
with the said hollow mandrel for the supply of the filling mass, substantially as
hereinbefore described.
3. A tube of yielding material, such as lead, tin or solder, filled during the
process of manufacture with a liquid filling material, or a flux, substantially as aud
for the purpose described.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.