Improved Manufacture of Enamelled Covers or Lids for Vessels.
Year: 1897

page_text: Date of Application, 5th May, 1897-Accepted, 5th May, 1898
COMPLETE SPECIFICATION.
Improved Manufacture of Enamelled Covers or Lids for Vessels.
A communication from CARL AUGUST HERMANN GEBLER, Manufacturer, trading
. ag Sachsische Emaillirwerke, Gebr. Gebler, of Pirna on the Elbe, in the
Empire of Germany,
I, ALFRED JULIUS BOULT, of 111, Hatton Garden, in the County of Middlesex,
Chartered Patent Agent, do hereby declare the nature of this invention and in
what manner the same is to be performed, to be particularly described and ascer-
tained in and by the following statement:-
Enamelled metallic vessels such as cans, pots, jugs and the like having covers
or lids also enamelled, are well-known. The cover generally consists of a disc and
of a cylindrical or conical flange secured thereto. If this flange is enamelled,
together with the whole cover, on the outside, as is generally the case, it is practi-
cally impossible to obtain a tight closing or fitting of the flange into the neck of
the vessel, as the layer of enamel is never perfectly uniform. For this reason
flanges of tinned metal have been tried, fitting with a flange into a groove in the
enamelled cover, but such flanges soon become rusty and therefore are not suitable
for durable enamelled vessels.
This invention, on the contrary, consists in making the flange of the cover of
sheet-iron covered or plated on the outer side, with metal. Then the whole cover
is enamelled, except this outer surface of the flange. In case the metal used for
covering has a low melting point, the whole cover can at first be enamelled and
then the outer surface of the sheet-iron flange covered with metal. In the latter
case the enamel is prevented in any well-known manner from adhering to the outer
surface of the flange, which is afterwards to be plated.
With regard to the tin-plate-flanges mentioned above, it must be pointed out,
that tin-plate can not be enamelled as it will not take the enamel, and besides the
tin would melt on the side which is not to be enamelled in consequence of the
heat necessary for the application of the enamel. When using sheet-iron instead
of tin-plate or plate tinned on both sides, it is possible to make covers with flanges
enamelled on one side, in case it is desired to cover the outer surface with metal
after enamelling.
It is however preferable to adopt the method first mentioned, by using sheet-
iron previously covered with metal on one side. Sheet-iron nickel-plated on one
side is preferred, but of course any other plating may be used. Nickel-plated shect-
iron withstands the heat required for burning in the enamel.
The subsequent covering of the outer surface of the flange (previously enamelled)
with metal such for instance as tin, zinc, copper, &c., can be effected by electrolytic.
or any other suitable process. If the metal to be used can stand the heat, the
covering is preferably effected on the sheet of metal, that is to say before the flange
is cut out and secured to the cover itself.
Such covers can be made to close tightly or at least much better than completely

page_text: enamelled ones; and they do not rust as quickly as tin-plate flanges and are much
more durable.
Fig. 1 in vertical section & Fig. 2 in plan (partly in section) illustrate the
application of the invention, the parts marked a being enamelled & the parts
marked being plated.
Having now particularly described and ascertained the nature of the said inven-
tion, as communicated to me by my foreign correspondent, and in what manner the
same is to be performed, I declare that what I claim is :-
1. An enamelled cover or lid for vessels, having a sheet-iron flange enamelled
together with the top of the cover, but only on one side and covered on its outer
side with metal, substantially as described.
2. The manufacture of enamelled covers for vessels consisting in cutting out
the flange from sheet iron, covered on one side with metal, securing it to the top
disc of the lid with its metal-covered surface outside and enamelling the whole,
but so that only the inner surface of the flange becomes enamelled, substantially
as described.
3. The manufacture of enamelled vessel-covers or lids having flanges of sheet-
iron, in such manner, that the outer surface of the flange is left unenamelled and
is subsequently plated with metal, substantially as described.
BOULT & WADE,
Agents for the Applicant.