Square embossed roof and rib plate

• US 20040018062A1
• Filed: 06/09/2003
• Published: 01/29/2004
• Est. Priority Date: 06/07/2002
• Status: Active Grant

• Current Assignee: FCI Holdings Delaware, Inc.
• Original Assignee: Jennmar Corporation (Frank Calandra, Inc.)
• Inventors: Stankus, John C., Brandon, Demrey G., Eaton, Jack R., Calandra, Frank Jr., Stewart, Eugene H.
• Granted Patent: US 7,284,933 B2
• Time in Patent Office: Days
• US Class Current: 405/288
• CPC Class Codes: E21D 11/155 Laggings made of strips, slats, slabs or sheet piles longitudinal struts for mine arches E21D11/28
• CPC Class Codes: E21D 21/0086 Bearing plates
• CPC Class Codes: Y10T 428/24653 Differential nonplanarity at margin

Abstract

Disclosed is a mine roof and rib support system generally including a square bearing plate. A through hole is positioned near a center portion of the square bearing plate. A peripheral section at least partially circumscribes the bearing plate. In between the through hole and the peripheral section is a rib member area. The rib member area may include two rib members with a convex cross-section connected by a substantially linear surface member disposed between the two rib members, two or more concave ribs with a substantially linear surface member disposed between the two rib members, or two substantially linear surfaces connected by a convex rib member. A safety edge surrounds the square bearing plate. The safety edge may be a rolled edge, a looped edge, a folded edge, or another comparable edge. Also disclosed is a method for making the mine roof and rib support system.

Claims

1. A mine roof support system for a mine roof bolt, comprising:

a square bearing plate defining a through hole positioned in a center portion of the square bearing plate and a peripheral section at least partially circumscribing the square bearing plate; and

at least one rib member area disposed between the through hole and the peripheral section and at least partially circumscribing the bearing plate,

wherein the mine roof bolt is received through the through hole.

2. The mine roof support system according to claim 1, wherein the rib member area includes two or more rib members and one or more substantially linear surface member between each pair of rib members.

3. The mine roof support system according to claim 2, wherein each of the two or more rib members has a convex cross-sectional shape.

4. The mine roof support system according to claim 2, wherein each of the two or more rib members has a concave cross-sectional shape.

5. The mine roof support system according to claim 1, wherein the rib member area includes two or more rib substantially linear surface members and one or more rib member between each pair of linear surface members.

6. The mine roof support system according to claim 5, wherein the rib member has a convex cross-sectional shape.

7. The mine roof support system according to claim 1, further including a safety edge surrounding the peripheral section.

8. The mine roof support system according to claim 7, wherein the safety edge is a rolled edge.

9. The mine roof support system according to claim 7, wherein the safety edge is a looped edge.

10. The mine roof support system according to claim 7, wherein the safety edge is a folded edge.

11. A method of making a mine roof support system, comprising the steps of:

a) forming a blank having a through hole positioned in a center portion of the blank, a peripheral section circumscribing the blank, and at least one rib member area circumscribing the blank and disposed between the through hole and the peripheral section; and

b) forming a safety edge circumscribing the blank.

12. The method of making a mine roof support system according to claim 11, wherein the step of forming the safety edge includes the steps of:

i) forming a substantially 90°

angle at an edge of the peripheral section; and

ii) subsequently rolling the angle at the edge.

13. The method of making a mine roof support system according to claim 11, wherein the step of forming the safety edge includes the steps of:

i) forming a substantially 90°

angle at an edge of the peripheral section; and

ii) subsequently looping the angle at the edge.

14. The method of making a mine roof support system according to claim 11, wherein the step of forming the safety edge includes the steps of:

i) forming a substantially 90°

angle at an edge of the peripheral section; and

ii) subsequently folding the angle at the edge.

15. The method of making a mine roof support system according to claim 11, wherein the step of forming the blank occurs in a first operation and the step of forming the safety edge occurs in a second operation.

16. The method of making a mine roof support system according to claim 15, wherein the first operation is performed by a first die assembly and the second operation is performed by a second die assembly and a third die assembly.