Improvements in the Manufacture of Hollow Articles of Celluloid, and in Apparatus therefor.
Year: 1895

page_text: Date of Application, 3rd Apr., 1895-Accented, 18th May, 1895
Improvements in the Manufacture of Hollow Articles of Celluloid,
and in Apparatus therefor.
A communication by LAZARUS ALBERT KUNTZ and ALFRED ABRAHAM
ROSENTHAL, both of 10, Brunnenstrasse, Berlin, in the Empire of Germany,
Merchants and Manufacturers.
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I, WILLIAM PHILLIPS THOMPSON F.C.S., M.1.M.E., of The Agency for:
Foreign Patent Solicitors, 6 Lord Street, Liverpool and 6, Bank Street,
Manchester, both in the County of Lancaster, 118 New Street Birmingham in
the County of Warwick and 31 High Holborn in the County of Middlesex
Civil Engineer, 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 relates to moulds employed for blowing out, with steam, or other
fluid hollow articles of celluloid.
The moulds at present employed for this purpose have the disadvantage that the
article produced is of unequal thickness in its walls. This drawback especially
frequent if the hollow articles are to be made of a form varying in width at
different parts, such, for instance, as dolls' heads to be applied to dolls' bodies of
leather or the like. In such cases the head is blown out considerably larger than
the neck and the breast wider than the head. An article of three very different
widths is thus produced from a tube of equal width. The neck as the narrowest
part of the dolls' head is thereby folded or wrinkled, which folds cannot be removed
and the product is spoilt, or the material distributes itself so unequally during the
blowing that the celluloid tube is burst, and the parts in question, more particularly
the breast, are only partially formed. The disadvantages in the manufacture
of dolls' heads as herein before set forth also occur with other articles and are
avoided by the present invention.
In the accompanying drawings, an improved mould is shown,
Figure 1 being an elevation of one half of the mould,
Figure 1 a modification,
Figure 2, a longitudinal section of the complete mould, and
Figure 3, a view of a moulded article.
;
The mould is made as usual in two or more parts according to the form of the
article to be produced and has its interior formed as a counterpart to the shape of
the article to be produced.
.
At the upper end of the mould is a mouthpiece a which is provided with a
threaded part, on which the steam pipe may be screwed. At the other end the
halves of the mould are provided with a ridge b (or a recess d, Figure 1ª of
corresponding section).
In the hollow of the mould a wedge or core c is placed, which has approximately
the shape of the article which is to be formed, the end of this core corresponding
to the narrowest width of such article. At its bottom end, the wedge has recesses
or ridges which correspond exactly in shape and size to the ridge 6 or the recess d
respectively of the halves of the mould. The core is thus held in its proper
position within the mould and serves to close the same up at the bottom. The
inflating or pressing out medium, for instance steam, or the like, expands the
celluloid tube which is placed in the mould and forces it to fit exactly the walls of
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page_text: the mould. As the end of the core almost entirely fills up the width of the
neck, creases or folds can no longer be produced at this point, and the celluloid tube
must retain its proper position in the mould, so that inequalities in the thickness of
the walls are prevented.
This improvement may of course be employed with celluloid blowing moulds for
all kinds of articles in which it is desirable to avoid folds and wrinkles and to
produce walls of equal thickness.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed, as communicated to
me by my foreign correspondents I declare that what I claim is :-
1. The improvements in the manufacture of hollow articles of celluloid consisting
in placing within the mould a wedge or core c having approximately the shape of
the article to be produced and arranged to rest against the tube at the part thereof
which is to be least expanded; whereby on the ends of the latter being expanded no
folds or wrinkles are formed in the tube, said core serving further to hold
the celluloid tube in its proper position inside the mould and to close the latter
substantially as described.
2. In apparatus for forming hollow articles of celluloid by the pressure of steam
or other fluid, the combination with a mould, of a wedge or core c having a form
depending on the shape of the article to be produced and having a ridge or groove
at its lower end adapted to engage in a corresponding groove or ridge at the base of
the mould, substantially as and for the purpose set forth.
Dated this 2nd day of April 1895.
WM. P. THOMPSON & Co.,
Agents.