AN IMPROVED ANNEALING FURNACE FOR GLASSWORKS
Year: 1878

page_text: LETTERS PATENT to Carl Pieper, of Dresden and Berlin, for the Invention of
"AN IMPROVED ANNEALING FURNACE FOR GLASSWORKS." A communication
from Wilhelm Hirsch, of Radeberg, Saxony.
Sealed the 19th July 1878, and dated the 23rd January 1878.
PROVISIONAL SPECIFICATION left by the said Carl Pieper at the Office of
the Commissioners of Patents on the 23rd January 1878.
CARL PIEPER, of Dresden and Berlin. "AN IMPROVED ANNEALING FURNACE
FOR GLASSWORKS." A communication from Wilhelm Hirsch, of Radeberg,
Saxony.
This Invention relates to an improvement in annealing furnaces for hollow glass
wares, to the annealing receptacles employed therewith, and to the method of
annealing.
In annealing furnaces, as used at present, larger glass wares are commonly placed
into the heated furnace, which is then left to cool with its contents; while smaller
articles are, by preference, put within the furnace into pots or vessels of fire-clay,
which are thereupon gradually removed into cooler parts of the furnace, or lifted
out of the same altogether by means of suitable instruments.
д
According to the present Invention the receptacles for the glass to be annealed
in, which are, by preference, made rectangular, i.e., in the shape of a box, are placed
on a truck, which is conveyed into the furnace on a line of rails, an opening
provided with a sliding door being arranged for this purpose in the end wall of the
furnace.
The boxes on the truck having been heated to the proper degree the glass wares
are placed into them through working holes in the front wall of the furnace, and
when they are filled the truck on which they stand is withdrawn from the furnace
either by the opening through which it had been run in or through another opening
opposite to the former. The boxes are then covered by lids and left to cool in the

page_text: glass-house or in any other convenient place outside of the furnace. After the
removal of the truck with the filled boxes another truck is conveyed into the
furnace. The work may thus proceed with but a single annealing furnace, which is
always kept at the same temperature.
The boxes are open on the side towards the working holes of the furnace, and
they stand slightly inclined on the trucks, the open side being raised so as to
prevent the glass wares from falling out,
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Carl Pieper in the Great Seal Patent Office on the 22nd July 1878.
CARL PIEPER, of Dresden and Berlin. "AN IMPROVED ANNEALING FURNACE
FOR GLASSWORKS." A communication from Wilhelm Hirsch, of Radeberg,
Saxony.
This Invention relates to an improvement in annealing furnaces for hollow glass
wares, to the annealing receptacles employed therewith, and to the method of
annealing.
In annealing furnaces, as used at present, larger glass wares are commonly placed
into the heated furnace, which is then left to cool with its contents; while smaller
articles are, by preference, put within the furnace into pots or vessels of fire-clay,
which are thereupon gradually removed into cooler parts of the furnace, or lifted
out of the same altogether by means of suitable instruments.
According to the present Invention the receptacles for the glass to be annealed
in, which are by preference made rectanuglar, i.e., in the shape of a box, are placed
on a truck, which is conveyed into the furnace on a line of rails, an opening
provided with a sliding door being arranged for this purpose in the end wall of the
furnace.
'The boxes on the truck having been heated to the proper degree the glass wares
are placed into them through working holes in the front wall of the furnace, and
when they are filled the truck on which they stand is withdrawn from the furnace
either by the opening through which it had been run in or through another opening
opposite to the former.. The boxes are then covered by lids and left to cool in the
glass-house or in any other convenient place outside of the furnace. After the
removal of the truck with the filled boxes another truck is conveyed into the
furnace. The work may thus proceed with but a single annealing furnace, which is
always kept at the same temperature.
The boxes are open on the side towards the working holes of the furnace, and
they stand slightly inclined on the trucks, the open side, being raised so as to
prevent the glass wares from falling out.
On the annexed Sheet of Drawings an annealing furnace of the described kind
with the appertaining trucks and receptacles for glass wares is represented in
elevation (Fig. 1) and in vertical section (Fig. 2).

page_text: H is the furnace, which is heated by gas entering by the channels A and B.
Any other mode of heating the furnace may, however, be employed. D and D' are
the sliding doors provided with counterbalance weights for closing the apertures
through which the trucks G with the annealing boxes F are introduced and with-
drawn. At the left-hand end of the furnace these boxes are represented uncovered,
while at the other end they are shown closed by their lids. The boxes are open at
the side opposite to the working holes E in the side wall of the furnace, so as to
permit of an easy introduction of the articles to be annealed, and they stand
inclined on the truck in the manner shown by Fig. 2.
As the boxes can with facility be conveyed into and out of the furnace by means
of the trucks, their size and weight is of no material consideration in this respect;
the walls of the same may consequently be made sufficiently thick as to allow of
their being exposed to the ordinary temperature of the glass-house without causing
them and their contents to cool too rapidly, as may easily occur with the aforesaid
pots, which have to be lifted out of the furnace by hand, and therefore cannot
conveniently exceed a certain weight.
The described furnace requiring no change of temperature it causes a great
saving of fuel as compared with furnaces requiring an alternate heating and cooling.
Moreover, a single furnace of the former kind supplies the place of several of the
latter sort.
The annealing boxes may, with advantage, be made of such a size and thickness
of walls that while the series on one truck is being filled the boxes on the other
truck may cool and be emptied, so that only two trucks are required in this case.
For large and heavy glass wares it may, however, be preferred to have annealing
boxes of larger size and thicker walls, so as to cause them to cool more slowly, and
in this case a larger number of trucks will be wanted.
It may yet be observed that in the described method of annealing glass wares no
cooling chambers whatever are combined with the furnace, so that the same is
reduced to the smallest size possible.
Having thus described the nature and object of this Invention, and the manner
in which it may be performed or put in practice, I declare that I claim as new and
essential features of the same,―
1. In combination with an annealing furnace for glass ware consisting of a single
chamber the boxes or receptacles F placed on trucks G, substantially as and for the
purpose stated.
2. The method of annealing glass wares, according to which such wares are placed
into boxes or receptacles F standing on trucks G within a furnace H, the said boxes
or receptacles being, wheen filled, drawn out of the furnace by means of the said
trucks, and allowed to cool without the furnace, substantially as described.
In witness whereof, I, the said Carl Pieper, have hereunto set my hand and
seal, this Second day of July, in the year of our Lord One thousand eight
hundred and seventy-eight..
CARL PIEPER. (L.S.)