Sifting screen

Patent metadata

Field	Value
Publication number	US-10259012-B2
Application number	US-99683209-A
Country	US
Kind code	B2
Filing date	Jul 8, 2009
Priority date	Jul 10, 2008
Publication date	Apr 16, 2019
Grant date	Apr 16, 2019

Abstract

The invention relates to a screen frame adapted for use in a shaker and to which woven wire mesh is to be attached, comprising an outer perimeter and a plurality of plastics ribs extending between opposing regions of the perimeter, the frame being arranged such that, when fitted in a shaker to which it is adapted for, a portion of the opposing regions is clamped in place and a portion of the opposing regions is not clamped with the number of plastics ribs per unit length for the clamped portion greater than the number of plastics ribs per unit length for the unclamped portion, and to a shaker comprising at least one such screen frame.

First claim

The invention claimed is:

1. A screen frame adapted for use in a shaker to separate solids from a liquid/solid mixture and to which a woven wire mesh is attachable, the screen frame comprises:
an outer perimeter having a first thickness and bounding an upper face and a lower face,
a plurality of plastic ribs extending between opposing regions of the outer perimeter forming an integrally formed orthogonal array of plastic ribs, wherein the orthogonal array of plastic ribs is integrally formed with the outer perimeter and the screen frame is arranged such that, when fitted in a shaker to which it is adapted for, a portion of the opposing regions is clamped in place and a portion of the opposing regions is not clamped with the number of plastic ribs per unit length for the clamped portion greater than the number of plastic ribs per unit length for the unclamped portion; and
one to five metal ribs having a constant rectangular cross-section and extending between opposing, clamped regions of the outer perimeter, wherein the one to five metal ribs are part of a wire mesh structure by being connected to the wire mesh structure and the one to five metal ribs and the wire mesh structure are encased in plastic material.

2. The screen frame according to claim 1 , wherein the perimeter of the screen frame is a rectangular perimeter comprising two long sides and two short sides, the plastic ribs extending between both pairs of opposing regions, thus forming a plurality of rectangular openings.

3. The screen frame according to claim 1 , wherein the ratio of the number of plastic ribs per unit length between the clamped portion to the number of plastic ribs per unit length between the unclamped portion is at least 1.1:1.

4. The screen frame according to claim 1 , wherein the one to five metal ribs consists of two to four metal ribs.

5. The screen frame according to claim 1 , wherein the one to five metal ribs traverse at least 90% of the distance between the opposing regions it extends between.

6. The screen frame according to claim 1 , wherein the one to five metal ribs extend from 50% to 100% of the distance from the upper face of the screen frame to the lower face of the screen frame.

7. The screen frame according to claim 1 , wherein the one to five metal ribs have a plurality of holes.

8. A shaker comprising at least one screen frame according to claim 1 .

9. The screen frame according to claim 2 , wherein the long sides of the perimeter are clamped in place in a shaker.

10. A screen for use in a shaker to separate solids from a liquid/solid mixture and to which a woven wire mesh is attachable, the screen comprises:
a screen frame comprising:
an outer perimeter having perimeter material and bounding an upper face and a lower face;
a plurality of plastic ribs extending between opposing regions of the perimeter and integrally formed with the outer perimeter, the plurality of plastic ribs comprising an array of integrally formed transverse and longitudinal ribs, wherein the screen frame being arranged such that, when fitted in a shaker to which it is adapted for, a portion of the opposing regions with at least one transverse rib extending therebetween is clamped in place, and a portion of the opposing regions with at least one longitudinal rib extending therebetween is not clamped, wherein the number of transverse plastic ribs per unit length for the clamped portion is greater than the number of longitudinal plastic ribs per unit length for the unclamped portion;
one to five metal ribs extend between opposing, clamped regions of the outer perimeter, wherein ends of the one to five metal ribs are located within the perimeter material of the outer perimeter; and
a plurality of steel wires bonded together and arranged to form an array connected to the one to five metal ribs, wherein the array and one to five metal ribs are encased in plastic material.

11. The screen of claim 10 , wherein the one to five metal ribs consist of two to four metal ribs.

12. The screen of claim 10 , wherein at least one of the plurality of plastic ribs comprises an internal wire.

13. The screen of claim 10 , wherein the plurality of plastic ribs comprises the array and one to five metal ribs encased in the plastic material.

14. The screen of claim 13 , wherein the plurality of plastic ribs further comprises a layer of wire mesh structure disposed above the array and encased in the plastic ribs.

15. The screen of claim 14 , wherein the plurality of plastic ribs further comprises a plurality of spacers between the array and the layer of wire mesh structure and encased in the plastic material.

16. The screen of claim 10 , wherein the array of transverse and longitudinal ribs comprises at least three longitudinal ribs.

Assignees

• Robertson Graham
• Carr Brian
• Cady Eric
• Mi Llc
• M I Drilling Fluids Uk Ltd

Inventors

• Robertson Graham
• Carr Brian
• Cady Eric

Classifications

• B07B1/46 Primary

  Constructional details of screens in general; Cleaning or heating of screens · CPC title

• B07B1/4663

  Multi-layer screening surfaces · CPC title

• B07B1/4672

  Woven meshes · CPC title

• B07B1/4609

  constructional details of screening surfaces or meshes · CPC title

• B07B1/30

  jigging or moving to-and-fro {within their own plane} in or approximately in {or transverse to} the direction of conveyance · CPC title