Improvements in Dies for the Production of Sunk or Female Dies or Recessed Designs.
Year: 1892

page_text: Date of Application, 12th Aug., 1892
Complete Specification Left, 29th Mar., 1893-Accepted, 6th May, 1893
PROVISIONAL SPECIFICATION.
Improvements in Dies for the Production of Sunk or Female Dies
or Recessed Designs.
I, ERNST HAMMESFAHR, of No. 7 Foche, Solingen, Germany, Manufacturer, do
hereby declare the nature of this invention to be as follows:-
On impressing relief or male dies into heated or cold materials for forming sunk
or female dies or recessed designs, the air contained between the meeting surfaces
of the two objects or the gases that may be generated there, prevent the obtaining
of sharp impressions if there are deep or complicated recesses in the design. In
such cases entire parts often remain without impression. The female die is also
often given to break or crack.
On these grounds the female dies or sunk designs are mostly either entirely
engraved by cutting tool or they are finished by such means.
According to my present invention I obviate these disadvantages by forming in
the male die fine perforations which allow of the escape of the air or gases
imprisoned between the two meeting surfaces.
By this means it is possible to obtain an intimate contact between all parts of
the two surfaces, whereby perfectly sharp impressions are obtained that require no
retouching except at those points that are opposite the perforations of the male
die. At these points, owing to the penetration of the substance of the female die
or sunk design to a certain extent into the perforations of the male die, small
projections are formed on the female die which can however be readily removed by
a suitable cutting tool.
Dated this 19th der of August 1899
ABEL & IMRAY,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Dies for the Production of Sunk or Female Dies
or Recessed Designs.
I, ERNST HAMMESFAHR, of No. 7, Foche, Solingen, Germany, Manufacturer, 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:-
On impressing relief or male dies into heated or cold materials for forming sunk
or female dies or recessed designs, the air contained between the meeting surfaces
of the two objects or the gases that may be generated there, prevent the obtaining
of sharp impressions if there are deep or complicated recesses in the design. In
such cases entire parts often remain without impression. The female die is also
often given to break or crack.
On these grounds the female dies or sunk designs are mostly either entirely
engraved by cutting tools or they are finished by such means.
According to my present invention I obviate these disadvantages by forming in
the male die fine perforations which allow of the escape of the air or gases
imprisoned between the two meeting surfaces.
By this means it is possible to obtain an intimate contact between all parts of
the two surfaces, whereby perfectly sharp impressions are obtained that require no
retouching except at those points that are opposite the perforations of the male
die. At these points, owing to the penetration of the substance of the female die
Price 81

page_text: or sunk design to a certain extent into the perforations of the male die, small
projections are formed on the female die which can however be readily removed by
a suitable cutting tool.
On the accompanying drawing are shewn by way of example two constructions
of dies according to my said invention.
a is a male die of any desired form which is to be pressed into the block b, for
producing the female die.
At the recessed portions of the male die are formed perforations cc, which can
either be vertical and parallel as shewn or inclined or otherwise formed. Thus on
forcing the male die into the material for forming the female die or recessed
design, the air imprisoned in the recessed portions of the male die can escape
through the perforations, thus enabling such cavities to be perfectly filled with the
material of the female die. As before stated, any small quantity of such material
that may project into the perforations can afterwards be readily removed.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
Constructing dies for the production of sunk or female dies or recessed designs,
with perforations for the escape of air or gases, substantially as described.
Dated this 29th day of March 1803
ABEL & IMRAY,
Agents for the Applicant
ABEL & IMRAY,
Agents for the Applicant