Improvements in Strainer Plates for Straining Paper Pulp and other similar materials.
Year: 1892

page_text: Date of Application, 28th Mar., 1892
Complete Specification Left, 28th Dec., 1892-Accepted, 28th Jan., 1893
[Communicated from abroad by CARL HEINRICH ROECKNER, of 84, Handjerry
Strasse, Friedenau, Berlin, in the Empire of Germany, Engineer.]
Improvements in Strainer Plates for Straining Paper Pulp and
other similar materials.
We, FRANK LIONEL ROECKNER, of Two Water's Mill, Boxmoor, in the
County of Hertford, and RAMSEY LLEWELLYN ROECKNER, of 15 St. Lawrence
Road, North Kensington, in the County of Middlesex, Paper Makers, do hereby
declare the nature of the said invention to be as follows:-
This invention relates to certain improvements in strainer plates used more
especially in the construction of strainers for straining the pulp employed in paper-
making, but the said improvements are also applicable to strainer plates or strainers
used for straining other materials.
According to this invention the strainer plate is formed of a sheet of metal, such
as tough brass for example, which is folded or pleated transversely or longitudinally
in such manner that the folding or pleatings form ribs on the underside of the plate
which stiffen it in one direction, and leave the upper surface more or less in the
form of ridges of slight elevation with slight depressions or furrows between them.
The ribs formed by the foldings or pleatings may be strengthened with solder run
in between the folds, or by rivets passing through such folds, or in any other
convenient manner. When the plate is thus prepared, slits are formed therein at
suitable distances apart by means of a saw, in a direction transverse to the
aforesaid ridges and ribs. Such slits extend through the sheet of metal forming
the upper surface of the strainer plate, and if required, to a short distance into the
ribs beneath but not to a sufficient depth in such ribs as would materially weaken
them. By this arrangement each slit can be cut from end to end of the plate at
one operation, and the strainer plate can be made with great economy from a plain
sheet of metal. The strainer plate is supported by a grating or frame in the
usual way.
Instead of making the strainer plate from a single sheet of metal folded or
pleated so as to form the several ribs on the underside of the plate, it may be made
of any required number of strips of sheet metal bent into a channel section. These
strips of channel section are then joined together, side by side, by soldering, or
rivetting, for example, so that the vertical sides of the said channel sections form
ribs on the underside of the plate somewhat similar to those formed by folding or
pleating as above described. The slits are then cut through the horizontal parts of
the plate in a direction transverse to the said ribs as before.
Dated this 28th day of March 1892.
F. L. ROECKNER,
R. L. ROECKNER,
Per W. H. Beck,
115, Cannon Street, London, Agent.

page_text: COMPLETE SPECIFICATION.
Improvements in Strainer Plates for Straining Paper Pulp and
other similar materials.
.
We, FRANK LIONEL ROECKNER, of Two Waters Mill, Boxmoor, in the County
of Hertford and RAMSEY LLEWELLYN ROECKNER, of 15 St. Lawrence Road,
North Kensington, in the County of Middlesex, Paper Makers, do hereby declare
the nature of the said invention, and in what manner the same is to be performed,
to be particularly described and ascertained in and by the following statement, that
is to say :-
This invention relates to certain improvements in strainer plates used more
especially in the construction of strainers for straining the pulp employed in paper-
making; but the said improvements are also applicable to strainer plates or strainers
used for straining other materials. And in order that the said invention may be
fully understood we will now proceed to describe the same with the aid of the
accompanying sheet of drawings, which represent, in sectional elevation, strainer
plates constructed in accordance with the said invention.
According to this invention the strainer plate is formed of a sheet of metal A
(see Figures 1, 2 and 3) such as tough brass for example, which is folded or pleated
transversely or longitudinally at B in such manner that the foldings or pleatings B
form ribs on the underside of the plate A. which stiffen it in one direction, and
leave the upper surface more or less in the form of ridges of slight elevation with
slight depressions or furrows C between them. The ribs B, formed by the foldings
or pleatings, may be strengthened with solder run in between the folds, as illustrated
at C in Figure 1, or by rivets passing through such folds, as illustrated at D in the
same figure, or the said ribs may be strengthened in any other convenient manner.
When the plate is thus prepared, slits are formed therein at suitable distances apart
by means of a circular saw such as that shown at E in Figure 2 for example, in a
direction transverse to the aforesaid ridges and ribs. Such slits extend through the
sheet of metal A. forming the upper surface of the strainer plate, and if required
to a short distance into the ribs B beneath, but preferably not to a sufficient depth
in such ribs as to materially weaken them. By this arrangement each slit can be
cut from end to end or from side to side, as the case may be, of the plate at one
operation, and the strainer plate can be made with great economy from a plain
sheet of metal. The strainer plate is mounted in a frame F and supported in the
usual way.
In Figure 3 the foldings or pleatings B of the plate A are bent so as to enclose
metallic rods G which impart additional stiffness and strength to the ribs.
Instead of making the strainer plate from a single sheet of metal folded or pleated
so as to form the several ribs on the underside of the plate as shown in Figures 1,2
and 3, it may be made of any required number of strips of sheet metal A¹ bent
into a channel section as shown in Figure 4. These strips of channel section are
then joined together side by side by soldering or rivetting for example, so that the
vertical sides of the said channel sections form ribs B' on the underside of the plate
somewhat similar to those formed by folding or pleating as above described. The
slits are then cut through the horizontal ridged parts of the plate in a direction
transverse to the said ridges and to the ribs as before.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is:
First Constructing strainer plates from sheet metal by folding or pleating the
sheet metal in such manner that the foldings or pleatings form stiffening ribs on
the strainer plates, and by cutting the slits, through the ridges or elevations thereby,
formed in a direction transverse to such ridges or elevations and to the ribs,
"

page_text: substantially as hereinbefore described, and illustrated in Figures 1, 2 and 3 of
the drawings.
Second Constructing strainer plates from sheet metal by bending strips of sheet
metal into a channel section, joining the said channel sections side by side and
cutting the slits in a direction transversely to the ridges or elevations and ribs
thereby formed, substantially as hereinbefore described, and illustrated in Figure 4
of the drawings.
F. L. ROECKNER,
R. L. ROECKNER,
Per W. H. Beck,
115, Cannon Street, London, Agent.