Improvements in or relating to Enamelled Household Utensils and the like.
Year: 1892

page_text: Date of Application, 15th Feb., 1892
Complete Specification Left, 15th Nov., 1892-Accepted, 17th Dec., 1892
PROVISIONAL SPECIFICATION.
Improvements in or relating to Enamelled Household Utensils
and the like.
I, GABRIEL HIRSCH OESTREICHER of 95 Boulevard Beaumarchais, Paris, in
the Republic of France, do hereby declare the nature of this invention to be as
follows:-
But
Enamelled goods have of late been largely introduced into general use.
there is one drawback connected with them, for which so far no effective remedy
has been found, viz. the liability of the salient or projecting parts of such goods
to be deprived of the enamel coating sooner than the rest. How often does it not
happen indeed that a plate or dish, through the wearing off of the enamel at the
edge, which becomes dirty and unsightly in consequence, must be put aside as
practically unfit for further use. Wear, however, is by no means the only cause
of the partial removal of the enamel from enamelled kitchen utensils. It arises.
very frequently from the necessity of placing an article of this description, say, in
an oven, upon brackets or supports, which are thus caused to remain in contact
with certain parts of it, generally more or less in relief, and rub off the enamel
from those parts in a few days. The spot or spots thus rubbed off gradually extend
over the whole edge, which besides acquiring an unpleasant appearance, loses all
the advantages ascribed to an enamel coating.
The object of this invention is to devise a new method of retaining intact the
projecting portions of enamelled goods, and this method consists in depositing a
metal coating upon those portions.
To obtain good results, it is important that the article to be enamelled should be
made of thin sheet-iron of superior quality enabling deep recesses to be formed in
it, and free from any phosphorous element.
As soon as the article to be enamelled has received its coating of enamel, the
enamel is at once removed from the projecting parts with a sponge, piece of cloth.
or the like and the article with the remaining enamel upon it is placed into the
kiln to dry or bake.
The articles thus prepared i.e. enamelled everywhere except at their projecting
parts, are then placed in a bath composed differently according as the protecting
coating is of silver, gold, or nickel. The following mixtures are made in the three
cases respectively;
(1) For the nickel bath:
(A compound salt), sulphate of nickel and pure nickel.
(2) For the silver bath :
Nitrate of silver, pure cyanide of silver and phosphate of silver.
(3) For the gold bath :
Chloride of gold, pure cyanide of gold, phosphite of gold and caustic potash.
The articles to be treated by either of these baths are suspended therein from
wooden nippers pegs or other supports through one side of which passes a wire
which forms one of the electrodes, each peg holding the article under treatment
in such a position as to keep the said wire in contact with any suitable point of
the non-enamelled projection or bead. The other electrode is immersed in the
bath, and as the current passes through the bath and the non-enamelled portion
of that article, there forms a metallic deposit throughout the unenamelled part or
parts as the case may be. In the case of a silver bath, the anode should be of
silver or platinum.
The support should be shifted from time to time so that the contact may not take

page_text: For cheaper goods, for which gold, silver or nickel baths would be too
expensive a tin bath, consisting simply of molten tin, may be employed instead.
The article is dipped into the tin, which in no way affects the enamelled parts, to
which it will not adhere, but only to the parts left without enamel.
Dated this 15th day of February 1892.
W. P. THOMPSON & BOULT,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in or relating to Enamelled Household Utensils
and the like.
I, GABRIEL HIRSCH OESTREICHER, of 95 Boulevard Beaumarchais, Paris
in the Republic of France, 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:-
-
Enamelled goods have of late been largely introduced into general use. But
there is one drawback connected with them, for which so far no effective
remedy has been found, viz. the liability of the salient or projecting parts of
such goods to be deprived of the enamel coating sooner than the rest. It
frequently happens indeed that a plate or dish through the wearing off of the
enamel at the edge, which becomes dirty and unsightly in consequence, must be
put aside as practically unfit for further use. Wear however is by no means
the only cause of the partial removal of the enamel from enamelled kitchen
utensils. It arises very frequently from the necessity of placing an article of
this description, say, in an oven, upon brackets or supports, which are thus
caused to remain in contact with certain parts of it, generally more or less in
relief and rub off the enamel from those parts in a few days. The spot or
spots thus rubbed off gradually extend over the whole edge, which besides
acquiring an unpleasant appearance, loses all the advantages ascribed to an enamel
coating.
The object of this invention is to devise a new method of retaining intact the
projecting portions of enamelled goods, and this method consists in depositing a
metal coating upon those portions.
To obtain good results, it is important that the article to be enamelled should be
made of thin sheet-iron of superior quality enabling deep recesses to be formed in
it, and free from any phosphorous element.
As soon as the article to be euamelled has received its coating of enamel, the
enamel is at once removed from the projecting parts with a sponge, piece of cloth
or the like and the article with the remaining enamel upon it is placed into the
kiln to dry or bake.
The articles thus prepared i.e. enamelled everywhere except at their projecting
parts, are then placed in a bath composed differently according as the protecting
coating is of silver, gold, or nickel. The following mixtures are made in the three
cases respectively,
(1) For the nickel bath,-
A compound salt, sulphate of nickel and pure nickel.
(2) For the silver bath,-
Nitrate of silver, pure cyanide of silver and phosphate of silver.
(3) For the gold bath,―
Chloride of gold, pure cyanide of gold, phosphite of gold and caustic potash.
The articles to be treated by either of these baths are suspended therein from
wooden nippers, pegs or other supports, through one side of which passes a wire
which forms one of the electrodes, each peg holding the article under treatment in
such a position as to keep the said wire in contact with any suitable point of the
non-enamelled projection or bead. The other electrode is immersed in the bath;.

page_text: and as the current passes through the bath and the non-enamelled portion of
that article, there forms a metallic deposit throughout the unenamelled part or
parts as the case may be. In the case of a silver bath, the anode should be of
silver or platinum.
The support should be shifted from time to time so that the contact may not take
place always at the same point.
For cheaper goods, for which gold, silver or nickel baths would be too expensive,
a tin bath, consisting simply of molten tin, may be employed instead. The article
is dipped into the tin, which in no way affects the enamelled parts, to which it will
not adhere, but only to the parts left without enamel.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is,
1. The preservation or protection of salient or projecting parts of enamelled
articles by the deposit of a metal coating upon such parts by immersion or by
electro deposition such projecting parts not having been originally enamelled or the
enamel having been removed from them.
2. A. metal pan plate or other "enamelled" article which is partly enamelled
and partly metal-coated substantially as described.
Dated this 15th day of November 1892.
W. P. THOMPSON & BOULT,
Agents for the Applicant.