Classifying – separating – and assorting solids – Sifting – Elements
Patent
1989-04-03
1994-11-29
Olszewski, Robert P.
Classifying, separating, and assorting solids
Sifting
Elements
209405, 209407, 209305, 209373, B07B 149
Patent
active
053681690
DESCRIPTION:
BRIEF SUMMARY
This invention relates to an improved screen construction.
With screens or sieves operated manually for screening or classifying material according to particle size, there is some difficulty in fixing the mesh material to the screen in a manner which will ensure that the mesh material is maintained in a taut condition. Accordingly, most screens which are sold these days for use in precision screening or classifying applications are of a fixed structure and do not permit easy replacement of the mesh material used therein.
It is an object of the present invention to provide an improved screen construction which permits easy replacement and interchanging of mesh material used therein.
In accordance with one aspect of the invention there is provided a mesh screen comprising at least one pair of cylindrical members each open at an end and a piece of mesh material clamped between the members, characterised in that the inner face of one cylindrical member is provided with a circumferential groove and a circumferential flange projecting in the same direction as the mouth of the groove, and the inner face of the other cylindrical member is provided with a circumferential flange adapted to mate with the circumferential flange the one cylindrical member with the mesh material interposed therebetween and the free edge of the circumferential flange of the other cylindrical member being accommodated within the groove.
With screens or sieves operated manually or mechanically for screening or classifying material according to particle size, each mesh screen is usually constructed as an independent unit with an independent housing.
Consequently, the screening or sieving operation is usually performed separately for each mesh screen containing appropriate sample of material. Such operations can tend to be time consuming when a large number of screening or sieving operations need to be performed independently of each other.
Accordingly, it is a preferred object of the present invention to provide an improved screen construction, wherein a plurality of separate mesh screens may be interconnected so as to be disposed within a single housing to facilitate the screening or sieving operation.
In accordance with another aspect of the present invention, there is provided a partition member for interconnecting and partitioning a plurality of mesh screens of the kind comprising at least one pair of cylindrical members each open at an end and a piece of mesh material clamped between the members, said partition member comprising a further cylindrical member having an inner radially disposed partitioning wall and a pair of opposed axially extending circumferential flange portions, each of said flange portions having an outer axial end of complementary shape to the outer axial end of a cylindrical member of a mesh screen so as to form a spigot in socket connection therewith when said members are brought into mutual engagement, wherein said members may be interconnected to provide a unitary housing for the mesh screens.
In accordance with a further aspect of the present invention, there is provided a composite screening unit comprising: members open at each end and a piece of mesh material clamped between the members: and radially disposed partitioning wall and a pair of opposed axially extending circumferential flange portions; complementary shape to the outer axial end of a cylindrical member of a mesh screen, so as to form a spigot in socket connection therewith when said members are brought into mutual engagement, whereby said members are interconnected to provide a unitary housing for the mesh screens.
In accordance with another aspect of the present invention there is provided a tool for levering apart interconnected cylindrical members of the kinds hereinbefore described, comprising an elongate lever having a handle portion and a pair of longitudinally spaced outwardly projecting spigots, wherein said spigots are intended to be located within external grooves of adjacent interconnected cylindrical members, such that a rotating for
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Druzbick Carol Lynn
Flexistack Pty Ltd
Olszewski Robert P.
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