Improvements in Melting Apparatus for Easily Fusible Substances.
Year: 1897

page_text: Date of Application, 6th Apr., 1897
Complete Specification Left, 6th Jan., 1898-Accepted, 12th Feb., 1898
PROVISIONAL SPECIFICATION.
Improvements in Melting Apparatus for Easily Fusible Substances.
I, NEWELL SILL JENKINS, of No. 15, Walpurgis-strasse, Dresden, in the Empire
of Germany, Dentist, do hereby declare the nature of this invention to be as
follows:
This invention refers to improvements in melting apparatus, and it is especially
devised for melting easily fusible materials, such as porcelain, enamel, and the
like, used for filling cavities in teeth, or for melting upon artificial teeth, and
platinum or gold plate, and for other purposes.
The melting apparatus consists mainly of a small muffle, preferably of metal,
lined inside with asbestos. The muffle is open at front, and its bottom is pro-
vided with a hole of suitable size.
The bottom rims of the muffle rest on a fork shaped carrier, on which the muffle
is held by small clamps. The fork-shaped carrier is hinged to an arm, which may
be shifted on its standard to the proper height for working purposes.
On the same standard, another arm is mounted, capable of being shifted to suit-
able height, to which arm a second carrier is hinged; a third arm is also mounted
on the standard, capable of being shifted a proper height, and carrying at its end
a small glass screen, which, at a suitable distance from the open front of the muffle,
protects the operator from the heat in the muffle.
In connection with this apparatus, there is a melting ladle, the handle of which
is supported by the second carrier when the ladle rests in the muffle; the ladle is
preferably made of platinum, and a small protecting cover may be used, which
cover is open in front, to allow inspection of the melting process.
Below the bottom hole of the muffle, a gas jet is arranged, the flame of which is
increased in its intensity by means of a blow pipe, with bellows or air-pressure
apparatus, and is directed against or around the ladle.
For the process of melting, the ladle is partly filled with a paste made of a
mixture of powdered asbestos and water, and on this paste is put the form or
counter impression of the teeth cavity, formed by gold-or platinum foil, into which
impression the material to be melted, porcelain, enamel, or such like, in a powdered
state, is inserted. By means of the blow-pipe flame, the ladle is brought to incan-
descence, by which the powdered material becomes fused, and takes exactly the
form of the impression corresponding to the tooth cavity of which said impression
is taken. The material to be melted may be mixed with any suitable coloring
matter, to be in correspondence with the color of the tooth to be filled.
The same process is employed in melting porcelain, enamel, or the like, upon
artificial teeth, or platinum or gold plate, or other metals.
Dated this 6th day of April 1897.
NEWTON & SON,
Agents for the Applicant.

page_text: Improvements in Melting Apparatus for Easily Fusible Substances.
I, NEWELL SILL JENKINS, of No. 15, Walpurgis-strasse, Dresden, in the Empire
of Germany, Dentist, 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 refers to improvements in melting apparatus, and it is especially
devised for melting easily fusible materials, such as porcelain, enamel, and the like,
used for filling cavities in teeth, or for melting upon artificial teeth and platinum
or gold plate, and for other purposes.
In the accompanying drawing,
Fig. 1 is an elevation, and
Fig. 2 a plan view, of the melting apparatus embodying my invention.
The melting apparatus consists mainly of a small muffle a, preferably of metal,
lined inside with asbestos. The muffle is open at front, and its bottom is provided
with a hole c of suitable size.
The bottom rims of the muffle rest on a fork-shaped carrier b, on which the muffle
is held by small clamps. The fork-shaped carrier bis hinged to an arm d, which
may be shifted on its standard e to the proper height for working purposes.
On the same standard e, another arm f is mounted, capable of being shifted to
suitable height, to which arm the carrier g is hinged; a third arm is also mounted
on the standard e, capable of being shifted with the arm f to a proper height, and
carrying at its end a small glass screen h, which, at a proper distance from the open
front of the muffle a, protects the operator from the heat in the muffle.
In connection with this apparatus, there is a melting ladle i, the handle m of
which is supported by the carrier g, when the ladle rests in the muffle; the ladle is
preferably made of platina, and a small protecting cover k may be used, which
cover is open in front, to allow inspection of the melting process.
Below the bottom hole of the muffle, a gas jet is arranged, the flame of which
is increased in its intensity by means of a blow pipe, with bellows or air pressure
apparatus to direct the flame against or around the ladle.
For the process of melting, the ladle i is partly filled with a paste made of a
mixture of powdered asbestos and water, and on this paste is put the form or
counter-impression of the tooth cavity, formed by gold or platinum-foil, into which
impression the material to be melted, porcelain, enamel, or such like, in a powdered
state, is inserted. By means of the blow-pipe flame, the ladle is brought to incan-
descence, by which the powdered material becomes fused, and takes exactly the
form of the impression corresponding to the tooth cavity. The material to be
melted may be mixed with any suitable coloring matter, to be in correspondence
with the color of the tooth to be filled.
The same process is employed in melting porcelain, enamel, or the like, upon
artificial teeth, or platinum or gold plate, or other metals.
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:-
The above described apparatus for melting easily fusible materials into special
shape or form, comprising a muffle with open front and a hole at its bottom, a
fork-shaped support for the same, a melting ladle, a support therefor, and a

page_text: screen, the supports being mounted on a standard, so as to be capable of adjust-
ment to a proper working height, all being arranged substantially as set forth.
The Tonuom 1808
NEWTON & SON,
Agents for the Applicant.