for Use in Dentistry.
Year: 1886

page_text: for Use in Dentistry.
I WILHELM LEDERLE of Freiburg in the Grand Duchy of Baden German Empire.
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 relates to hydraulic apparatus for the manufacture of artificial
palates or palates used in dentistry. The hydraulic press used in carrying out my:
Invention is constructed to exert a high pressure in a downward direction whereby
greater certainty and precision in the shaping or fitting of the palate plate is
obtained than is possible with apparatus acting by means of dies operated by
percussive action screws, levers or the like. In the hydraulic presses heretofore
employed in the manufacture of metal supports or plates used in dentistry the
pressure is applied from beneath but in the improved apparatus hereinbefore
described it is applied from above and acts through an elastic diaphragmn or plate
the edges of which form a packing as hereinafter described.
And in order that my said Invention may be fully understood I shall now
proceed more particularly to describe the same and for that purpose shall refer to
the several figures on the annexed sheet of drawings the same letters of reference
indicating corresponding parts in all the figures.
Figure 1 of the accompanying Drawings is a side elevation and Figure 3 is a
plan of an apparatus constructed according to my Invention.
Figure 2 is a vertical section of the same and figure 4 represents details
hereinafter explained.
The improved apparatus illustrated in the drawing is provided with a conical or
taper mould box D shewn detached in plan elevation and section in figure 4
containing a matrix C corresponding to the form of the plate to be produced the
said matrix being prepared in any suitable or known manner. The mould box D
is provided with a funnel & through which the molten Spence's metal or material
forming the matrix is poured or cast and with holes e for the escape of air in order
to obviate the formation of air holes or cavities in the operation of pouring in the
metal and to enable the latter to completely fill the box D. A notch f is formed in
the edge of the box D for the purpose of facilitating the extraction of the matrix
after use.
The requisite pressure is applied by means of a hydraulic press, A and

page_text: in order to facilitate the adjustment and fixing of the box D and matrix C under
the press the apparatus is provided with a screw E whereby the hydraulic press A
which may be of any suitable construction can be raised sufficiently to enable the
press block or cylinder F to be removed from its bed together with the matrix.
A plate or diaphragm a (figure 3) of india rubber is interposed between.the matrix
and the head of the press and the edges of the said plate are fixed between the
head and the cylinder F as indicated in Figure 3 so as to prevent leakage.
The pump of the press A being worked by a lever handle B for example water
or other liquid is forced into the space above the elastic diaphragm a and exerts
the necessary pressure upon the upper portion of the matrix C thereby causing the
palate plate previously placed between the two parts of the matrix to assume the
required shape with the utmost certainty and precision. The apparatus is provided
with a pressure guage G indicating the pressures necessary for the production of
the palate plate and with a discharge cock H for drawing off the liquid when it is
required to remove the plate after the pressing operation.
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
First. In a hydraulic press for making artificial palates the elastic or rubber
plate a acting as an elastic pressing plate and also as a packing to prevent
leakage substantially as hereinbefore described and illustrated in the accompanying
Drawings.
Second. In a hydraulic press for making artificial palates the arrangement of a
press block F whereby the pressure of the liquid is enabled to act directly upon
the matrix substantially as herein before described and illustrated in the accom-
panying drawings.
Third. In hydraulic presses for making artificial palates means for causing the
pressure to act from above upon the plate to be pressed so as to obtain sharp
impressions substantially as herein before described with reference to the accom-
panying Drawings.
Fourth. In hydraulic presses for making artificial palates the arrangement of the
conical box D fitting into the under part or block F and supported above the bed
of the press the said box D being provided with a funnel d'and a number of air
holes e so as to enable the metal or material to be cast and the mould or matrix to
be made and bedded in one operation for the purpose of subsequently effecting the
direct pressing of the metallic palate plate substantially as herein before described
with reference to the accompanying Drawings.
1000