Improvements in Perforated Plates for Strainers.
Year: 1896

page_text: Date of Application, 3rd Mar., 1896-Accepted, 4th Apr., 1906
COMPLETE SPECIFICATION.
Improvements in Perforated Plates for Strainers.
I, NICOLAUS HEID of Stockerau, near Vienna, Austria, 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 :-
This invention relates to improvements in the manufacture of perforated plates
used in breweries for straining the liquor, and has for object to produce the
perforations in such plates in a manner to allow of the holes being made much
closer together than is the case in existing methods, and to reduce the cost of
production.
The holes produced are conical-i.e.-widened towards the lower surface of the
plate.
Hitherto metal plates used for strainers have been perforated by means of
pressing conical punches or stamping-tools into them a sufficient distance from the
underside, and afterwards finishing the holes by means of fine drills.
The pressure exerted by the conical punches in penetrating the metal plates in
the above method causes bulging and irregularities destroying the evenness of the
plate, the consequence being that the adjacent holes become partly closed up by
the distortion of the plate. It is therefore practically impossible to perforate
a plate by existing methods with the holes sufficiently close together to answer the.
requirements of an efficient strainer.
According to my invention a plate may be perforated with about twice as many
holes in a given space as have hitherto been found practicable; the strainer
therefore has a proportionately larger capacity for work with a neater appearance,.
and the cost of manufacture is less than hitherto.
Upon the accompanying drawings,
Figure 1 is a plan of the underside of a portion of a plate perforated by the
existing method;
Figure 2, a similar view of a plate perforated with elongated holes by my
improved method,
Figure 3, a similar view of a plate perforated with round holes, and
Figure, a vertical section of the plate shewn on Figure 3.
In carrying out my invention, 1 produce the required number of perforations.
in the plate by drilling them from the lower surface to a sufficient depth by means
of conical drills, so that the holes have a wide opening, a, at the underside of the
plate; the upper portions, b, of the holes being afterwards made by means of fine
drills. By this means the number of holes perforated in a given space may be.
considerably increased as compared with present methods, without causing distortion.
or unevenness in the metal plate.
In the case of elongated openings, shewn on Fig. 2, I may form the holes with
semi-circular ends and straight sides, the upper portion of the openings being in
the form of a narrow longitudinal slit, and the lower part conical or widening:
downwards, as in the case of round holes.

page_text: 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 :-
1. Plates for strainers, perforated with round or elongated conical holes by
drilling, in the manner described with reference to the accompanying drawings.
Dated this 3rd das of March 1806.
he Applicant,
GEDGE & FEENY,
Agents.