Improvements in and relating to the Manufacture of Thin Plates and other Articles of Glass.
Year: 1887

page_text: Date of Application, 15th July, 1887
Complete Left, 9th Apr., 1888
Complete Accepted, 11th May, 1888
Improvements in and relating to the Manufacture of Thin Plates
and other Articles of Glass.
We, JOSEF TRASSL of Oberwarmenstoinach and HEINRICH LINDNER, of Fichtel-
berg, both in the Empire of Germany, Manufacturers, do hereby declare the nature of
this invention, to be as follows :-
This invention has for its object principally to enable thin plates of glass and other
articles thereof to be readily and efficiently cast.
"
Heretofore it has only been possible to cast thick plates of glass, owing to the
fact that the casting is generally performed outside the furnace and the molten glass
brought into contact before casting with cold air so that the plates are generally
brittle and break before or during the grinding.
The improved process consists in pouring the molten glass direct into the moulds in
a heated chamber in connection with the furnace.
For this purpose the furnace may be in connection with a flue or chamber into or
through. which the furnace gases pass. The said chamber is thereby heated regulation
thereof being effected by suitable registers. The moulds are introduced into this
chamber and are brought under a vent for the molten glass, which is allowed to fill
the moulds. The latter are preferably mounted in suitable carriages running on
rollers or otherwise in the chamber. The moulds for casting thin plates may be
made of a number of plates of metal bolted together and having slightly raised rims
with small perforations for the escape of air when pouring in the molten glass.
After casting the moulds may be allowed to remain in the chamber the latter being
gradually cooled. When sufficiently cooled the moulds may be transferred to further
cooling chambers in connection with the above mentioned casting chamber. These
cooling chambers have suitable means for heating and for gradually lowering the
temperature until the moulds may be brought into open air. Horizontal moulds or
tables may also be used and the glass poured thereon may be rolled in the said casting
chamber, or plates with ribs or perforations or other ornamental designs etc. may be
also easily formed therein.
Dotad this 15th day of Tul 1807
HERBERT & Co.,
Agents to Applicants.

page_text: Improvements in and relating to the Manufacture of Thin Plates
and other Articles of Glass.
We JOSEF TRASSL of Oberwar mensteinach and HEINRICH LINDNER of Fichtel-
berg both in the Empire of Germany, Manufacturers, 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 has for its object principally to enable thin plates of glass and other
articles thereof to be readily and efficiently cast.
Heretofore it has only been possible to cast thick plates of glass, owing to the
fact that the casting is generally performed outside the furnace, and the molten glass
brought into contact before casting with cold air, so that the plates are generally
brittle and break before or during the grinding.
The improved process consists in pouring the molten glass direct into the moulds
in a heated chamber in connection with the furnace.
For this purpose the furnace may be in connection with a flue or chamber, into
or through which the furnace gases pass. The said chamber is thereby heated,
regulation of the heat being effected by suitable registers. The moulds are introduced
into this chamber and are brought under a vent for the molten glass, which is
allowed to fill the moulds. The latter are preferably mounted in suitable carriages
running on rollers or otherwise in the chamber. After casting the moulds may be
allowed to remain in the chamber, the latter being gradually cooled. When
sufficiently cooled, the moulds may be transferred to further cooling chambers in
connection with the above mentioned casting chamber.
These cooling chambers have suitable means for heating and for gradually lowering
the temperature until the moulds may be brought into open air. Horizontal moulds
or tables may also be used and the glass poured thereon may be rolled in the said
casting chamber; plates with ribs or perforations or other ornamental designs etc.
may be also easily formed therein.
Referring to the accompanying drawings.
Fig 1 is a longitudinal vertical section of the furnace and casting chamber.
Fig. 2 is a horizontal section on line P P.
Fig. 3 is a section on line N N and
Fig. 4 a section on line R R Fig. 1.
Fig. 5 is a portion of the truck carrying the moulds in the casting chamber.
Fig. 6 a plan view of Fig. 5.
Figs. 7, 8 and 9 are sectional views on an enlarged scale, elevation plan and
side view of the moulds for casting thin flat plates.

page_text: Fig. 10 a view of the frame of said moulds.
Figs. 11 and 12 on an enlarged scale part elevational section and plan respectively
of modification in the mould plates.
Figs. 13 and 14 elevation and plan of other modified mould plates.
Figs. 15 and 16 similar views of a third form of mould plate.
Fig. 17 illustrates the manner of rolling horizontally cast plates.
Fig. 18 a front view of the main parts of the device therefor.
The furnace is so connected and arranged as shown in Figs. 1, 2 etc. that the
gases from the furnace traverse a chamber B, into which the moulds A etc. are
introduced, and in which the casting is performed, after the moulds have been
sufficiently heated. Near to the chamber B is arranged one or more cooling
chambers K separated from said chamber B; by doors S S acting also as registers
to enable the chambers K to be more or less heated from the chamber B.
To facilitate the management of the moulds in the chamber B, the moulds are
mounted upon trucks Whaving two sets of wheels journalled at right angles to
each other as illustrated more clearly in Figs. 5 and 6.
In the chambers B and K K are the rail tracks v and cross rail tracks the
rails forming each track have recesses where required to enable the flanges of the
respective set of wheels to move across the said rails when the truck is travelling
upon the other track. The trucks are introduced at the gate E and when sufficiently
heated are brought under the vent L the moulds filled with glass and the respective
truck conveyed along the track and cross track u into one of the cooling
chambers K.
The construction of the moulds is shown more clearly on an enlarged scale on
sheet 2 of the drawings. The moulds are composed of a number of plates p having
along their edges rims raised to a distance above the surface of the plates equal to
half of the thickness of the glass plates to be cast.
In the side rims sa corresponding half in each are the channels C each connected
to the space between two contiguous plates by the small perforations likewise
formed by cutting corresponding channels in the surface of the rims. The channels i
allow air to escape from the mould during the entrance of the fused glass.
Along a portion of the top rims the latter are bevelled away to form a flaring
opening by which the glass enters the moulds. The plates p may have any suitable
surface pattern for the casting of corrugated, ribbed, or ornamentally designed glass,
thus Figs. 13 and 14 illustrate plates for forming perforated plates, one of said
plates having pegs fitting into corresponding perforations in the opposite plate.
Figs. 15 and 16 illustrate plates for casting a species of glass, which can be made
by this invention consisting of a number of roundles or whirls connected in one
plate, said roundles having heretofore being made singly and connected together by
leaden cams.
To enable flat plates of glass to be horizontally cast and rolled in said chamber B
the latter is provided with the extension M with cross rail track u¹ in this chamber
is suspended the roller R held in an arm D and adapted to be lifted or lowered
by a chain passing over suitable pulleys and operated outside the chamber. The
truck W entering therein on track u¹ carries a horizontal plate or table O having
slightly raised rims n, irons m are also arranged at the side to serve as rails for
supporting the wheels 6 of the roller R. This form is brought under a vent in the
glass pot, filled with glass, and driven by the rods d back and forth under the
roller R lowered thereon. When sufficiently rolled, the truck W is passed to
the cooling chambers K through the chambers B.
Having now particularly described and ascertained the nature of our inven-
tion and in what manner the same is to be performed we declare that what we
claim is
1. The process of casting glass plates in a heated chamber so as to prevent the
liquid glass from coming in contact with cold air during the casting.

page_text: 2. The combination with a glass furnace of a chamber B adapted to be heated by
the gases from said furnace and to receive the moulds for casting.
3. The combination in a glass furnace of a chamber B adapted to be heated by the
gases from said furnace and to receive the moulds with a chamber or chambers K
having registers S S¹ substantially as set forth.
4. The combination of the chamber M adapted to be heated, and roller R with
wheels in said chamber with truck having table with rims n and iron m
substantially as and for the purpose set forth.
017
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HERBERT & Co.,
18, Buckingham Street, Strand, London, W.C.,
Agents to Applicants.