Classifying – separating – and assorting solids – Sifting – Elements
Reexamination Certificate
1999-04-22
2001-09-18
Nguyen, Tuan N. (Department: 3653)
Classifying, separating, and assorting solids
Sifting
Elements
C209S399000, C209S403000, C210S488000, C210S493100, C210S499000
Reexamination Certificate
active
06290068
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention is directed to screens for vibratory shakers, screens for classifying and/or filtering material, such screens with one or more ramped portions, and screens with individual screen modules, ramps, and/or plugs, and methods of screen repair and assembly.
2. Description of Related Art
The related art section of each of the above-identified applications is incorporated here fully by reference.
SUMMARY OF THE PRESENT INVENTION
The present invention discloses, in certain embodiments, a screen for vibrating screen apparatus. The screen has one or more upper layers of screen, screen cloth, and/or mesh. If more than one layer is used, they may be bonded together at discrete points, at discrete areas, or over their entire surface. The layer or layers are mounted on frame apparatus which may include a solid side support on each of two spaced apart sides of the layer(s), or may include a full four sided screen frame. A strip or strips of support material (e.g. flat steel, aluminum or plastic strips—of any width, but in certain preferred embodiments ranging between a half inch to three inches in width; and of any thickness, but in certain preferred embodiments ranging between one-thirty second and one-eighth inches thick, or rods of these materials with a diameter between one-thirty second and one-eighth inches; any screen may use strips made from different materials, e.g. cross-strips of plastic and end strips of steel, or vice versa) are secured across two or more frame sides. With respect to a two sided frame wherein the two sides are parallel and spaced apart, a strip or strips may be, according to this invention, disposed parallel to the two sides; and, if more than one strip is used, spaced apart across the area of the layer or layers. It is also within the scope of this invention to use a strip or strips which are disposed in a manner non-parallel to the two sides. In one aspect such non-parallel strips may extend diagonally from one end of one side of the frame, across the layer or layers, to a diagonally opposite end of the other side. In another aspect such a strip may extend from any point of a frame side to any point on a non-framed side of the layer or layers. Any such strip (or rod) may be bonded, sintered, welded or otherwise secured (herein referred to collectively as “bonded”) at any point to the layer or layers; at substantially every point of contact between the strip(s) and the layer(s); or at selected intermediate contact points.
Any strip herein may have holes through it to facilitate fluid flow. In one aspect any strip, combination of strips, or pattern of strips disclosed herein may be used with a generally flat (“two-dimensional”) screen. In any screen disclosed herein the screening material may be sintered to itself, individual screen wires may be sintered to each other, one or more layers of screen material, cloth, mesh, or screen may be sintered to each other; and any screen material may be sintered to any strip disclosed herein, either entirely along its length or at selected points or areas therealong.
The present invention, in one embodiment includes a shale shaker with a frame; a “basket” or screen mounting apparatus; one or more screens as described above and below; and basket vibrating apparatus.
It is within the scope of this invention to provide a screen as disclosed in U.S. Pat. Nos. 5,417,793; 5,417,858; and 5,417,859, but to delete the apertured plate required by these patents and to use instead a coarse mesh or a coarse flexible mesh and/or a panel as disclosed herein. In certain preferred embodiments this mesh ranges in size between a 1 mesh to a 3 mesh, with a 2 mesh used in one particular embodiment. It is within the scope of this invention to use any strip, combination of strips, or pattern of strips and/or panel disclosed herein in place of the apertured plate required by the three listed patents. It is within the scope of this invention to use any strip or strips disclosed herein in combination with the apertured plate required by the three listed patents.
New, useful, unique, efficient, non-obvious screens, filtering screens, two- or three-dimensional screens; flat or non-flat screens; mountings for them; such screens with one or more bottom support strips or rods; such screens in which screening material is on a corrugated perforated plate which itself is on strip(s) and/or on a frame; and/or any such screen with a panel as disclosed herein instead of or in addition to an apertured plate; and shale shakers with such items;
The present invention discloses a screen assembly for a vibratory separator or shale shaker, the screen assembly having at least one wire mesh screen formed with undulating mesh material having a series of ridges spaced apart by a series of valleys, an optional perforated plate with an undulating shape corresponding to the undulating mesh material of the at least one wire mesh screen, and a series of spaced apart rods, the corrugated perforated plate mounted on the rods of the series of spaced apart rods. In other aspects, the present invention discloses a screen assembly for a vibratory separator or shale shaker, the screen assembly having at least one wire mesh screen formed with undulating mesh material having a series of ridges spaced apart by a series of valleys, an optional perforated plate with an undulating shape corresponding to the undulating mesh material of the at least one wire mesh screen, the at least one wire mesh screen on the corrugated perforated plate, and a lower layer of wire mesh material, the lower layer of wire mesh material having a mesh size coarser than that of any layer of the at least one wire mesh screen.
The present invention, in certain embodiments, discloses a screen for a vibratory shaker for screening material flowing thereto, the screen having a frame with a plurality of spaced-apart frame openings, and a plurality of screen modules (or in other aspects, plugs) each disposed in a frame opening, each screen module having a module body with a module opening and screen means (e.g. mesh, screen, openings therethrough, etc.) at the module opening for screening material flowing thereto; such a screen wherein at least one or all screen modules is removably disposed in its respective frame opening; such a screen wherein the frame has exterior sides defining a frame space within the frame and wherein the plurality of frame openings extend substantially all across the frame space; such a screen wherein the frame is substantially flat or is corrugated; such a screen wherein the screening means is screening material (e.g. any mesh, screen or combination thereof) disposed over or in or over and in the module opening; such a screen wherein the frame has holding means and the screen modules have releasable attachment means (e.g. but not limited to a recess on one member and a bead on the other) that cooperate with the holding means to releasably mount the screen modules in the frame; such a screen wherein the frame is substantially flat with a top surface and at least one screen module (or all the modules) has a screening portion that projects above the top surface of the frame; such a screen wherein the frame has a bottom and at least one screen module (or all of them) has a screening portion that projects below the bottom surface; such a screen wherein there are projecting plug portions or module portions both above and below a frame, plate or panel and, in one aspect, holes or openings through the frame, plate or panel; such a screen wherein the plurality of screen modules includes a first set of screen modules and a second set of screen modules, the first set of screen modules having screening means having a first mesh (or screen) of a first mesh (or screen) size, and the second set of screen modules having screening means having a second mesh (or screen) of a second mesh (or screen) size, the first mesh size different from the second mesh size; such a screen wherein the first set of screen modules are for dewatering the ma
Adams Thomas C.
Largent David W.
Maroney, III James F.
McClung, III Guy L.
Murray Hector M.
McClung Guy
Nguyen Tuan N.
Tuboscope I/P Inc.
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