Improvements in Sieves or Strainers.
Year: 1890

page_text: Date of Application, 14th Aug., 1890
Complete Specification Left, 24th Sept., 1890-Accepted, 25th Oct., 1890
PROVISIONAL SPECIFICATION.
Improvements in Sieves or Strainers.
I RUDOLPH HENDRIK JOHAN GALLANDAT HUET trading as Weduwe Abraham Le
Grand & Belain of Haarlem in the Kingdom of Holland Manufacturer do hereby
declare the nature of this invention to be as follows:-
Sieves or strainers are usually constructed with the sifting straining or filtering
material attached to a frame or support made of wood bent in the form of a hoop
and secured by nails or the like. This construction presents numerous disadvantages,
portions of the materials treated collect in the crevices formed at the joints and
impregnate the wood this being a serious drawback especially in the case of wet
substances such as milk or yeast for example.
According to my present invention the frames or boxes of sieves or strainers
are constructed of vulcanite ebonite or indurated caoutchouc or india rubber or
other like material or composition which being cast or moulded in the desired form
is capable of being turned and polished so as to present a smooth surface without
pores or crevices in which the materials might be retained and which is capable of
being readily and thoroughly cleaned.
Ebonite is also more durable than wood for example owing to its elasticity and is
not liable to be corroded or injured by the action of acids and the like.
These improved sieves or strainers are provided with a cover or lid likewise of
vulcanite moulded in one piece with a rim or flange which fits the upper edge of a
vulcanite or ebonite frame or hollow cylinder on the bottom of which the sifting or
straining material is stretched. The latter is preferably provided with a hom or
cord and is held between the lower part of the said cylinder and a vulcanite or
ebonite hoop fitting the lower part of the cylinder. This hoop is provided with a
projection or shoulder and is fitted to a box or hollow cylinder of the same
material which receives the matter that passes through the gauze, cloth or other
sifting or straining material. The apparatus may be advantageously constructed with
a series of superposed sieves or strainers of different degrees of fineness so as to
separate the materials into several different grades at one operation. The sides and
bottom of the lower part or receptacle are likewise moulded in one piece and the
maker's name may be conveniently formed on the bottom and a representation of the
trade mark for example on the lid or cover. A number or other mark indicating
the degree of fineness of the sifting or straining material employed may also be
formed on the said material.
Dated this 14th day of August 1800
J. H. JOHNSON & Co.,
47, Lincoln's Inn Fields, London, W.C., Agents.
COMPLETE SPECIFICATION.
Improvements in Sieves or Strainers.
RUDOLPH HENDRIK JOHAN GALLANDAT HUET trading as Weduwe Abraham Le
Grand & Belain of Haarlem in the Kingdom of Holland 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 :-
Sieves or strainers are usually constructed with the sifting straining or filtering
material attached to a frame or support made of wood bent in the form of a hoop
and secured by nails or the like. This construction presents numerous disadvantages
portions of the materials treated collect in the crevices formed at the joints and

page_text: impregnate the wood this being a serious drawback especially in the case of wet
substances such as milk or yeast for example.
According to my present invention the frames or boxes of sieves or strainers are
constructed of vulcanite, ebonite or indurated caoutchouc which being cast or moulded
in the desired form is capable of being turned and polished and presents the following
advantages namely:-
1. Absence of all joints, crevices, cracks or inequalities whatever in the surfaces,
thus obviating waste of the material to be sifted and rendering the sifting operation
more perfect in its results.
2. With sieves or strainers having wooden frames the residue of the materials to be
sifted which remains in the joints and inequalities in the surfaces is liable to turn
sour, acidify and decay and thus prejudice the purity of the materials that are
subsequently sified in the same apparatus. This is especially liable to occur in treating
wet materials such as milk, yeast etc. With sieves having ebonite frames these
disadvantages are obviated.
3. The ebonite being flexible is less liable to injury from blows from hard bodies,
falls and the like so that these sieves being stronger last longer.
4. Ebonite resists the action of most reagents and its employment enables materials
containing these substances to be sifted or strained in apparatus constructed according
to my invention.
5. Ebonite or vulcanite can be employed according to my invention in the con-
struction of any descriptions of sieves or strainers whether plain or with a drum or
sieves for powders or pulverulent and other materials the said sieves or strainers
being constructed of any dimensions and with any degree of fineness of mesh or
perforation of the cloth or sifting material.
6. The top or cover as well as the bottom or receptacle of the sifting drum being
moulded in one piece with their respective sides there is no possibility of waste from
leakage this being a most important advantage attending the use of ebonite in place of
the wood, leather, parchment or other like materials ordinarily employed.
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 represents in vertical section an example of
a sieve or strainer constructed according to my invention.
Figures 2 and 3 illustrate the lid or cover detached in vertical section and plan
respectively.
Figures 4 and 5 illustrate in vertical section and in plan respectively the cylinder or
drum forming the part immediately connected to the sifting or straining material,
and
Figures 6 and 7 are similar views of a ring employed to retain the said material
in position.
Figures 8 and 9 illustrate in like manner the lower part or bottom of the apparatus
forming a receptacle for the materials that pass through the sieve.
The complete apparatus as represented in Figure I is composed of the several parts
illustrated separately or detached in the other figures as follow namely
1. A lid or cover A (Figures 2 and 3) on which an inscription or design such as
the trade mark of the manufacturer may appear as represented in the drawing.
2. A sifter or strainer proper composed of a cylinder or drum B, (Figures 4 and 5)
over the lower edge of which is stretched a sifting or straining material B' such as
silk cloth, wire gauze or the like. This material may be marked with a number (such
as the No. 14 in the example illustrated) showing the degree of fineness of the sieve
and its edge must be provided with a hem or welt.
3. A ring or hoop C (Figures 6 and 7) formed with an external shoulder c.
4. A bottom or receptacle D (Figures 8 and 9) which may display the name and
address of the maker or any other suitable mark.
In putting the parts together the sifting or straining material B' is stretched over

page_text: the bottom of the cylinder B and secured by means of the hoop C care being taken
to avoid covering the shoulder c. The hoop C is forced on to the drum B as
far as it will go and the sifting material B' is thereby effectually stretched. The
hem or welt at the edge prevents the latter from slipping back when the hoop is
being forced on. These parts are then placed on the bottom part or receptacle D
the hoop (entering the upper part of the latter until its shoulder c bears on the upper
edges of the sides as represented in Figure 1. The material to be sifted for example
being placed in the chamber or cylinder B the apparatus is closed by putting on the
lid or cover A.
After shaking the apparatus sufficiently to perform the sifting operation the upper
part of the apparatus is taken off in order to enable the finer part of the materials to
be removed from the lower part or receptacle D and the cover A is removed from the
drum B in order to remove the coarser part which has been retained upon the sifting
material B. The sifting is thus effectually performed without the smallest waste of
material as may be verified by weighing the latter before and after the operation.
This advantage results from the smoothness or polish of the surfaces, the perfect fit
between the several parts of the sieve and from the fact that the lid A as well as the
bottom part D are moulded in one piece with their respective sides. A number of
sieves or strainers of different or graduated degrees of fineness may be combined in
one apparatus so as to obtain in one operation products of several different qualities
or degrees of fineness.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
1. In the construction of sieves or strainers in general the employment of ebonite,
vulcanite or hardened caoutchouc in substitution for the wood or other material
heretofore employed as and for the purpose substantially as hereinbefore described.
2. The construction and arrangement of a sifter or strainer comprising a cover A,
a sifting or straining drum B having a sifting or straining bottom B', a hoop C and a
bottom or receptacle D substantially as hereinbefore described and illustrated in the
accompanying drawings.
3. The arrangement of the sifting or straining apparatus containing a number of
sifting or straining surfaces of different or graduated degrees of fineness substantially
as and for the purpose hereinbefore described.
4. The combinations and arrangements of parts and materials constituting the
improvements in sieves or strainers substantially as hereinbefore described.
Dated this 24th day of September 1890
J. H. JOHNSON & Co.,
47, Lincoln's Inn Fields, London, W.C., Agents.