Improved Apparatus to be used in the Manufacture of Glass Articles.
Year: 1899

page_text: Date of Application, 6th Feb.,
1899
Complete Specification Left, 4th Oct., 1899-Accepted, 16th Dec., 1899
PROVISIONAL SPECIFICATION.
Improved Apparatus to be used in the Manufacture of Glass Articles.
I, PAUL. THEODOR SILVERT, of 43, Eisenstuckstrasse, Dresden, in the Empire
of Germany, Glass Manufacturer, do hereby declare the nature of this invention
to be as follows:-
In a Provisional Specification filed by me January 30th 1899, No. 2094, I
described a mode of torming articles of glass from a molten mass subjected
to elastic pressure from below; the compressed air or gas passing up through
the porous slab on which the molten mass was laid, which mass was held down
by the edges of an overlying skeleton frame or mould, shaped to corespond
with the basic lines of the article or articles to be formed.
There is also known a process for the manufacture of glass tubes or cylindrical
vessels (see English Patent Nr. 1803 of 1890), according to which, within a
cylindrical mould, a glass mass is placed upon a piston moved upwards, which
presses the glass mass against the walls of the mould, while the mass is held
by recesses provided within the walls of the moulds. But in carrying out this
known process, no perforated slab or plate is used, as according to the Provisional
Specification mentioned above
I now, by the present invention, propose to apply a downward or upward
pressure to the molten mass. for the conversion of the same into a variety
of glass articles
For the purpose of applying downward pressure, I convert the supporting
slab into a shaping frame, which will act as a bed to support the molten mass,
and, as pressure is applied to the glass from above, will shape the molten glass.
it being forced down through an opening or openings in the supporting-bed,
which gives the shape
For the purpose of applying upward pressure. I combine the supporting slab,
which is perforated, and which will act as a bed to support the molten glass,
with a shaping frame or mould, which, as pressure applied to the glass from
below, will shape the molten glass. the pressure medium passing through the
opening in the supporting bed.
The opening or openings thro' which the pressing medium passes, will be
closed by a door or valve provided to support the molten mass until the pressure
is applied.
On the application of the pressure, the door or valve is opened, and the glass
is forced down though the bed, or upward through the shape-giving frame,
and allowed to take its permanent form in the open air. or in a mould placed
below or above the bed
It will be understood that the opening or openings in the supporting bed
will correspond with the peripherical shape of the articles to be moulded, and that
the glass mass will be held firmly round the edges of the openings by a retaining
frame or mould applied to the molten mass
An elastic medium may be used to provide the requisite pressure to the glass,

page_text: or, in place thereof, a plunger corresponding to the opening in the supporting
bed may be used, to force the glass to take the required form.
1
1
11
1000
NEWTON & SON,
Agents for the Applicant.
Improved Apparatus to be used in the Manufacture of Glass Articles.
I, PAUL THEODOR SIEVERT, of 43, Eisenstuckstrasse, Dresden, in the Empire
of Germany, Glass 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 a Provisional Specification filed by me January 30th 1899, No 2094, I
described a mode of forming articles of glass from a molten mass subjected
to elastic pressure from below; the compressed air of gas used to impart the pres-
sure passing up through the porous slab on which the molten mass was laid, which
mass was held down by the edges of an overlying skeleton frame or mould shaped
to correspond with the basic lines of the article or articles to be formed.
There is also known a process for the manufacture of glass tubes or cylindrical
vessels (see English Patent No. 1803 of 7890), according to which, within a
cylindrical mould, a glass mass is placed upon a piston moved upwards, which
presses the glass mass against the walls of the mould, while the mass is held
by recesses provided within the walls of the mould. But in caying out the
known process, no perforated slab or plate is used, as in the Provisional Specifi-
cation mentioned above.
I now, by the present invention, propose to apply a downward pressure to
the molten mass, for the conversion of the same into a variety of glass articles,
employing for that purpose modifications of the above mentioned inventions.
According to my invention, I convert the glass supporting slab or plate into
a shaping fiame, which, when fitted with a valve for closing the opening, will
serve to support the molten mass On pressure being applied and the valve
opened, the molten glass will be forced down through the supporting bed, and
take the sectional shape of the opening.
In the accompanying drawings:
Fig is a vertical section of the apparatus for bringing the molten glass
to shape by the downward pressure of air, which dives the molten glass
through the opening in the supporting slab or plate, compelling it to take the
sectional form of that opening, which, before the pressure is applied, is closed
by a hinged valve.
Fig is a similar arrangement of apparatus for eftecting the like object.
a descending piston or plunger being used m place of the elastic medium
Fig. 3 shows a modification of the valve which closes the opening in the
slab and
Fig 4 shows a variation of the mechanism for actuating the valve.
Fig 5 shows a modification of the air-tight box of Fig. 1, with chamfered
edges for cutting into the molten slab, and thereby facilitating the removal of
the surplus glass from the moulded article.
Referring now to Fig. 1, a is a slab or plate on which the glass layer e is
spread, such slab having an opening, closed by a valve attached by a hinge
to the plate a. This opening in the slab is shaped to correspond with the
cross section of the hollow object to be blown. Over the glass-layer, a closed

page_text: an-box is applied, and serves to mp the molten glass between itself and the
slab a This box o is in connection with the piping of the elastic pressure
medium, and, by its means, the holding fast of the glass layer at the edges of
the articles to be manufactured is effected On the admission of compressed
an to the box o, and the simultaneous withdrawal of the valve n', the hollow
glass article will be formed in the open an, the weight of the expanding glass
serving to secure the parallelism of its sides.
Thus a cylinder may be formed of fai larger capacity than the glass blower
is able to blow, and capable of producing, when opened out, a glass slab of
proportionately large dimensions.
In Fig. 2, is a piston or plunger, which, acting the part of the elastic
medium, drives down the molten glass through the slab a, which imparts to the
glass, in its descent, a peripherical form corresponding to the opening in the
slab.
Fig 3 shows a modified form of valve for closing the opening in the sup-
porting slab.
In this case, instead of employing a swing valve, 1 cause the
valve to slide up and down on vertical pendent guide rods, thereby closing
the opening in the slab to support the molten glass while the slicking operation
takes place, and opening a passage for the descent of the glass under the
downward pressure applied thereto.
The sliding valve is attached to, and cared by, weighted chains m, m.
which pass over pulleys m' carried by suitable adjacent supports.
On slackening these chains, the valve will descend under the pressure of
the expanding medium, leaving the glass fiee to descend to any desned dis-
tance, regulated by the length of the guide rods ², which may be furnished
with adjustable stops for limiting the descent of the valve a'.
In place of weighted chains for carrying the valve n¹, I may employ, as
indicated at Fig 4, a rack and pinion 7,7', which will raise and lower the
valve as required, the same being actuated by a hand-wheel and gears r, l
From the above explanation, it will be seen that the basis of the manufacturing
process is the spread-out glass layer held fast at the margin of the hollow
article to be formed, while pressure is applied within the confined border.
Fig 5 shows the frame with edges bevilled to gup the glass layer at the
outline or rim of the article to be manufactured, in a nannei to facilitate the
removal of the surplus glass.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I claim is:
1. In the manufacture of glass articles from a layer of molten glass resting
on a supporting slab, and held thereon by a skeleton frame or mould, the use
of a slab with an opening that will control the shape of the article to be pro-
duced, such opening being closed by a valve which assists in supporting the
molten layer po to the application of elastic or other moulding pressure
thereto.
In combination with a glass receiving and shaping slab fitted with a valve
for assisting to support the retained glass prior to the application of the elastic
or other moulding pressure, a reciprocating plunger foi forcing the layer of
molten glass down through the slab, for the purpose above set forth.
Dated this 26th day of Sentember 1899
NEWTON & SON,
Agents for the Applicant.