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US 2013/0220892 A1Published application
Method and Apparatuses for Pre-Screening
AssigneeDerrick Corporation
InventorsKeith WOJCIECHOWSKI, Christian NEWMAN
Life of this patent
Estimating the term…
Abstract
A vibratory screening machine includes a primary screening area and a pre-screening assembly including a frame and screen assemblies. The screen assemblies are secured to the frame and form a pre-screening surface. The frame is attached to the vibratory screening machine such that the concave pre-screening surface is above the primary screening area.
Claims33
A pre-screening assembly for a vibratory screening machine, comprising:
- a frame;
- and multiple screen assemblies, the frame including a central spine and ribs, the ribs form a concave support surface for the screen assemblies, the central spine attaches to a central member of the vibratory screening machine, the screen assemblies secured to the frame and arranged together to form a concave pre-screening surface that pre-screens a material before it reaches a primary screening surface of the vibratory screening machine.
A method for screening materials, the method comprising:
- pre-screening a material using a pre-screening assembly having multiple screen assemblies configured to form a concave pre-screening surface, the pre-screening assembly secured to a vibratory screen machine and positioned above a primary screening surface, the pre-screening assembly including an elongated member that attaches to a central structural member of the vibratory screening machine independently of a side wall of the vibratory screening machine.
A pre-screening assembly for a vibratory screening machine, comprising:
- a frame;
- and screen assemblies, the frame includes a central spine that attaches to a central member of the vibratory screening machine, the screen assemblies secured to the frame forming a concave pre-screening surface.
Dependencies are inferred from the claim text.