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US 8,439,203 B2Granted
Method and apparatuses for pre-screening
AssigneeDerrick Corporation
InventorsKeith F. 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.
Claims22
A vibratory screening machine, comprising:
- a primary screening area;
- and
- a pre-screening assembly including
- a frame having an elongated central keystop and
- screen assemblies including a first substantially horizontal screen assembly, a first substantially vertical screen assembly, a second substantially horizontal screen assembly and a second substantially vertically screen assembly,
- wherein the first substantially vertical and first substantially horizontal screen assemblies are pressed together and against a first surface of the keystop and releasably secured to the frame and the second substantially vertical and second substantially horizontal screen assemblies are pressed together and against a second surface of the keystop opposite the first surface of the keystop, the first substantially vertical and first substantially horizontal screen subassemblies and second substantially vertical and second substantially horizontal screen assemblies forming a concave pre-screening surface,
- wherein the frame is attached to the vibratory screening machine such that the concave pre-screening surface is above the primary screening area.
4 more elements
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:,
- wherein vibrations are isolated to the pre-screening assembly through the central spine;
- wherein the screen assemblies include horizontal portion screen assemblies and vertical portion screen assemblies and the ribs include horizontal and vertical rib portions, the horizontal rib portions extending substantially perpendicular to the spine, the vertical rib portions extending substantially perpendicular to the horizontal rib portions, wherein the horizontal portion screen assemblies and vertical portion screen assemblies are arranged on the horizontal and vertical rib portions, respectively;
- and
- further comprising a screen assembly attachment arrangement configured to press the horizontal portion screen assemblies and vertical portion screen assemblies together to form the pre-screening surface.
3 more elements
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;
- wherein the frame includes ribs extending from the central member forming a concave support surface, the screen assemblies secured to the concave support surface;
- wherein the screen assemblies include horizontal portion screen assemblies and vertical portion screen assemblies and the ribs include horizontal and vertical rib portions, the horizontal rib portions extending substantially perpendicular to the spine, the vertical rib portions extending substantially perpendicular to the horizontal rib portions, wherein the horizontal portion screen assemblies and vertical portion screen assemblies are arranged on the horizontal and vertical rib portions, respectively;
- and
- further comprising a screen assembly attachment arrangement configured to press the horizontal portion screen assemblies and vertical portion screen assemblies together to form the concave pre-screening surface.
3 more elements
Dependencies are inferred from the claim text.