Classifying – separating – and assorting solids – Sifting – Elements
Reexamination Certificate
1997-08-08
2001-04-24
Nguyen, Tuan N. (Department: 3653)
Classifying, separating, and assorting solids
Sifting
Elements
C209S403000
Reexamination Certificate
active
06220448
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to an improved screen assembly having channeling strips thereon for channeling the flow of material during a vibratory screening operation and to a method of fabrication thereof.
By way of background, screening assemblies for use in vibratory screening machines are well known in the art. One type in common use is fully disclosed and described in U.S. Pat. No. 4,575,421. It is also known that screen assemblies having longitudinal strips of various types thereon have been used in the past to channel flow of materials in columns and to thus prevent the materials from migrating away from the center of the screen during vibration. It is with an improved screen of the foregoing type that the present invention is concerned.
BRIEF SUMMARY OF THE INVENTION
It is one object of the present invention to provide an improved screen assembly for a vibratory screening machine which has unique channeling strips bonded thereto in an unique manner.
It is another object of the present invention to provide an improved method for fabricating a screen assembly having channeling strips bonded thereto. Other objects and attendant advantages of the present invention will readily be perceived hereafter.
The present invention relates to a screen assembly for a vibratory screening machine comprising a screening screen having an upper surface, longitudinal side edges on said screening screen, a plurality of spaced elongated plastic strips extending longitudinally between said longitudinal edges and fused to said screen and extending above said upper surface, and stiffening rods in said elongated channelling strips.
The present invention also relates to a method of fabricating a screen assembly for a vibratory screening machine comprising the steps of providing a fixture having a plurality of grooves therein, laying a plurality of elongated plastic members having stiffening rods therein into said grooves, superimposing a screening screen over said tubes, and applying a heated platen to said screen to thereby cause said plastic strips to fuse into said screen.
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See Attached Sheets and Exhibits A, B, C, D, E and F.
Bakula John J.
Wojciechowski Keith F.
Derrick Manufacturing Corporation
Gastel Joseph P.
Nguyen Tuan N.
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