US4289427A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for installing roof bolts
Assignee: Owens Corning Fiberglas Technology Inc
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Filing: 1979-02-07
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Granted: 1981-09-15
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Expires: 1999-02-07
Abstract
Abstract A process for supporting the roof of a mine shaft includes drilling a hole into the roof and then inserting a multi-stranded cable into the hole. The cable has a duct therein to allow the exit of air during its insertion. During the insertion, the cable is rotated and a bonding agent is introduced into the annulus between it and the surface of the hole.
Inventors
- 👤 John A. Rolston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:49
CPC Classifications
E; E21; E21D; E21D21/00; E21D21/0026; E21D20/00; E21D20/003; E21D21/006
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
95 words
A process comprising: inserting a cable into a hole in a surface of a mine shaft, said cable comprising a plurality of twisted strands wherein a plurality of said strands each have a duct extending from one end of the strand to the other to permit air to escape from the hole; sealing the entrance of said hole around said cable; rotating the cable in the direction to tighten the cable during its insertion into said hole and; simultaneously with the insertion of said cable, injecting a bonding agent into said hole around said cable.
Claim 2
Dependent Claim
95 words
A process comprising: inserting a cable into a hole in a surface of a mine shaft, said cable comprising a plurality of twisted strands wherein a plurality of said strands each have a duct extending from one end of the strand to the other to permit air to escape from the hole; sealing the entrance of said hole around said cable; rotating the cable in the direction to tighten the cable during its insertion into said hole and; simultaneously with the insertion of said cable, injecting a bonding agent into said hole around said cable.
Claim 3
Dependent Claim
13 words
The process of claim 1 wherein the strands comprise resin bonded glass fibers.
Claim 4
Dependent Claim
23 words
The process of claim 2 wherein the bonding agent is selected from the group consisting of polyesters, epoxy and polyurethane resins and sulfur.
Claim 5
Dependent Claim
39 words
The process of claim 3 wherein the bonding agent is sulfur and prior to its insertion it is heated to a temperature sufficient to maintain it above its melting point until the cable is inserted to the desired depth.
Claim 6
Dependent Claim
21 words
The process of claim 3 wherein the viscosity of the bonding agent is in the range 100-2,000 c.p.s. at 55° F.
Claim 7
Dependent Claim
23 words
The process of claim 3 wherein the bonding agent is introduced into said hole at a pressure not substantially greater than 15-20 p.s.i.
Claim 8
Dependent Claim
21 words
The process of claim 6 wherein the viscosity of the bonding agent is in the range 100-2,000 c.p.s. at 55° F.
Claim 9
Dependent Claim
23 words
The process of claim 1 wherein the bonding agent is introduced into said hole at a pressure not substantially greater than 15-20 p.s.i.
Claim 10
Dependent Claim
21 words
The process of claim 8 wherein the viscosity of the bonding agent is in the range 100-2,000 c.p.s. at 55° F.
Claim 11
Dependent Claim
24 words
A mine shaft having its roof and sides supported by glass fibers inserted into said roof or sides by the process of claim 1.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-09-14 | 1985-03-16 | 1985-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-14 | 1989-03-16 | 1989-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-14 | 1993-03-16 | 1993-09-15 | $7700.00 | Window Closed / Lapsed |