Improved Method of Separating Drawn Tubes, Cases, or Capsules from their Mandrils.
Year: 1888

page_text: Date of Application, 1st Sept., 1888
Complete Specification Left, 23rd Nov., 1888
Complete Specification Accepted. 15th Jan., 1889
PROVISIONAL SPECIFICATION.
Improved Method of Separating Drawn Tubes, Cases, or Capsules
from their Mandrils.
1 WILHELM LORENZ of No. 44, Westendstrasse of Karlsruhe in the Grand Duchy
of Baden, German Empire Engineer and Manufacturer, do hereby declare the nature
of this invention to be as follows:-
In drawing tubes cases or capsules upon mandrils the disadvantage arises that the
drawn article fits so closely against the surfaces of the mandril that its removal
therefrom is attended with great difficulty, and this difficulty increases with the
size of article drawn, so that, when drawing large tubes or cases, their removal can
only be effected by continued hammering of the outside thereof at the risk of
damaging the article.
According to my present invention, I effect the ready removal of such drawn
articles from their mandrils, without deterioration, by forcing liquid or gas under
pressure in between the surfaces of the mandril and the drawn article, thereby
loosening the latter from the former by slightly extending it, so that it can then
be readily drawn off.
For this purpose, the mandril has a passage formed through it, as shown by
way of example at Figure 1 and 1 of the accompanying drawing, in which a, is
the tubular article and the mandril, which has a central passage connected by a
pipe to a receptacle containing liquid, air or gas under pressure so that on
opening the cock or valve the fluid pressure passes through the mandril and
penetrates between the outer surface of this and the inner surface of the article a,
thereby expanding this slightly until it can escape at its open end at c; when this
takes place the article will be found to be loose from the mandril and easily
removable. Instead of admitting fluid pressure into the mandril, a small quantity
of explosive material may be introduced at d as shewn in Figure 2 into the

page_text: passage of the mandril so that on closing the outer end hereof and igniting the
charge by any suitable means, such as by an electric spark, the gases under
generated pressure will force their way between the mandril and the drawn article,
as before stated.
Dated this 1st day of Contanchion 1000
ABEL & IMRAY,
Agents for the Applicant.
Improved Method of Separating Drawn Tubes, Cases, or Capsules
from their Mandrils.
I, WILBELM LORENZ; of No. 44 Westendstrasse, of Karlsruhe, in the Grand Duchy
of Baden, German Empire, 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 :-
In drawing tubes, cases, or capsules upon mandrils the disadvantage arises that the
drawn article fits so closely against the surfaces of the mandril that its removal.
therefrom is attended with great difficulty, and this difficulty increases with the size
of article drawn, so that when drawing large tubes or cases, their removal can only
be effected by continued hammering of the outside thereof, at the risk of damaging
the article.
According to my present invention I effect the ready removal of such drawn
articles from their mandrils, without deterioration, by forcing liquid or gas under
pressure in between the surfaces of the mandril and the drawn article, thereby
loosening the latter from the former by slightly extending it so that it can then be
readily drawn off.
For this purpose the mandril has a passage formed through it, as shewn by way
of example, at, Figs. 1 and 15 of the drawing accompanying my provisional speci-
fication, in which a is the tubular article and the mandril which has a central
passage connected by a piper to a. receptacle containing liquid, air or gas under
pressure, so that on opening the cock or valve h the fluid pressure passes through
the mandril and penetrates between the outer surfaces of this and the inner surfaces
of the article a, thereby expanding this slightly until it can escape at its open end
atc; when this takes place, the article will be found to be loose from the mandril:
and easily removeable.

page_text: Instead of admitting fluid pressure into the mandril, a small quantity of explosive
material may be introduced at d, as shewn in Fig. 2, into the passage of the mandril
so that on closing the outer end hereof, and igniting the charge by any suitablo
means, such as by an electric spark, the gases under pressure generated will force
their way between the mandril and the drawn article, as before stated.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
The method substantially as herein described of separating drawn tubes, cases, or
capsules from their mandrils, consisting in introducing a liquid or gas (such as
explosive gases) under pressure between the mandril and the tubular article so as
to expand the latter slightly.