Improvements in the Manufacture of Sheet Glass.
Year: 1899

page_text: Date of Application, 19th Dec., 1899
Complete Specification Left, 18th Sept., 1900-Accepted, 17th Nov.,
1900
Improvements in the Manufacture of Sheet Glass.
I, PAUL THEODOR SIEVERT, of 43, Eisenstuck Strasse, Dresden, in the Empire
of Germany, Glass Manufacturer, de hereby declare the nature of this invention
to be as follows:-
In the manufacture of sheet glass, as hitherto performed by the casting pro-
cess, the pouring out of the liquid glass was generally followed by the spreading
out of the liquid glass, and smoothing down of the same by means of rollers or
such like mechanical means. This treatment created certain disadvantages which
it is the design of the present invention to remove. I now propose to spread
the liquid glass on a plate or table so arranged as to receive a shaking motion.
This shaking motion may be imparted to the plate or table in all directions:-
it may
take place in vertical or horizontal directions, or in vertical and horizontal
directions. The horizontal table or plate may be provided with a vertical rim,
in order to prevent running off of the liquid glass, or sliding off of the spread-out
glass layer.
The plate or table may be made of metal, or of any suitable material. I pre-
ferably make such plate or table of a material of inferior heat-conducting capacity,
such, for instance, as wood, asbestos, or refractory clay, because such material
will advantageously retard the solidifying of the liquid mass.
The plate or table may be a hollow one, with perforations on its upper surface;
upon this plate or table a layer of fibrous material may be placed, to receive the
molten glass. The hollow space in the plate or table may be filled with water,
which, by the shaking motion of the plate or table, keeps the fibrous layer on it
constantly moist.
The moist surface of such fibrous layer will materially reduce all indents upon
the underside of the glass, which indents would occur if the liquid glass mass
rested on a dry surface.
The shaking motion of the plate or table may be effectuated by hand, or by
known mechanical means.
In carrying out the process, I proceed by imparting a shaking motion to the
The quantity of
plate or table, and then pour the liquid glass upon the same.
such liquid glass has to be chosen according to the extent and thickness of the
glass sheet to be produced. The shaking motion is continued until the liquid
glass is completely smoothed down, and after the glass has solidified, the sheet
will present a perfectly smooth surface, with its natural fire-polish thereon.
In some cases I prefer to place over the rim of the plate or table, a second
plate, also of a non-conducting material. This second plate is brought into posi-
tion after the pouring out of the liquid glass, and it may be held in position by
fillets, or by any other suitable means. Against this second plate, the glass mass,
in its spreading-out process, will be dashed by the reciprocating motion of the
shaking table.
A
1
10th day of December 1899.
NEWTON & SON,
Agents for the Applicant.

page_text: Improvements in the Manufacture of Sheet Glass.
I, PAUL THEODOR SIEVERT, of 43, Eisenstuck Strasse, 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 the manufacture of sheet glass, as hitherto performed by the casting pro-
cess, the pouring out of the liquid glass was generally followed by the spreading
out of the liquid glass, and smoothing down of the same by means of rollers or
such like mechanical means. This treatment created certain disadvantages, which
it is the design of the present invention to remove. I now propose to spread
the glass, while still in a liquid state, by imparting to it a shaking motion.
This shaking motion may be transmitted through the plate or table whereon
the glass is poured, the said table being shaken in all directions, either vertically
or horizontally, or both vertically or horizontally. The horizontal table or
plate may be provided with a vertical rim, in order to prevent running off of the
liquid glass, or sliding off of the spread-out glass layer.
pre-
The plate or table may be made of metal, or of any suitable material. I
ferably make such plate or table of a material of inferior heat-conducting capacity,
such, for instance, as wood, asbestos, or refractory clay, because such material
will advantageously retard the solidifying of the liquid mass.
The plate or table may be a hollow one, with perforations on its upper surface;
upon this plate or table a layer of fibrous material may be placed, to receive the
molten glass. The hollow space in the plate or table may be filled with water,
which, by the shaking motion of the plate or table, keeps the fibrous layer ou it
constantly moist.
The moist surface of such fibrous layer will materially reduce all indents upon
the underside of the glass, which indents would occur if the liquid glass mass
rested on a dry surface.
The shaking motion of the plate or table may be effectuated by hand, or by
any convenient mechanical means.
In carrying out the process, I proceed by imparting a shaking motion to the
plate or table, and then pour the liquid glass upon the same. The quantity of
such liquid glass has to be determined according to the extent and thickness of the
glass sheet to be produced. The shaking motion is continued until the liquid
glass is completely smoothed down, and, after the glass has solidified, the sheet
will present a perfectly smooth surface, with its natural fire-polish thereon.
In some cases I prefer to place over the plate or table, a second plate or cover,
also of a non-conducting material. This second plate is placed in position after
the pouring out of the liquid glass is effected, and it may be held in position by
clamps, or by any other suitable means. Against this second plate the glass,
while in its liquid state, will be dashed by the reciprocating motion of the shaking
table.
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. The process of manufacturing sheet glass above described, wherein the glass,
in a liquid state, is poured out upon a table, to which is imparted a shaking
motion, for the purpose of spreading out the glass to the desired extent, substan-
tially as set forth.

page_text: 2. In the manufacture of sheet glass, wherein it is exposed, in a liquid state,
to a shaking motion upon a table, the employment of a covering plate for the
said glass while the same remains on the table during the shaking operation, sub-
stantially as set forth.
Dated this 10th day of September 1900