US4247224A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for installing a mine roof bolt
Assignee: PPG Industries Inc
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Filing: 1978-12-14
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Granted: 1981-01-27
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Expires: 1998-12-14
Abstract
Abstract A mine bolt formed of continuous fiber reinforced pultruded rod-like reinforcing element is disclosed. This rod-like element includes at least one helical groove and/or protrusion along its length, with the continuous reinforcing fibers in the protrusions or surrounding grooves generally conforming to the helical pattern of the outer surface of the rod. The bolts formed by the instant invention also have utility in reinforcing such structures as mine roofs or concrete. The bolt of the instant invention comprises the above helically grooved rod fitted with an end cap that fits the helical turns of the grooved rod. The end cap may also serve as the mine roof plate.
Inventors
- 👤 Charles W. Killmeyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:08
CPC Classifications
E; E21; E21D; E21D21/00; E21D21/0026; E21D20/00; E21D20/02; E21D20/025; E21D21/0006
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
167 words
A method of installing a mine rock bolt comprising inserting a curable resin composition and catalyst into a drilled hole in the mine rock, inserting a fiber reinforced resinous rod having one or more continuous protrusions and/or grooves on the surface thereof and extending along the length of said resinous rod and wherein the fiber reinforcement in said protrusion and grooves follows the pattern of the protrusions and grooves around the said resinous rod such that at any point along the length of the rod the same fiber reinforcement is located in said protrusion and grooves, affixing the end of said resinous rod with an end cap having a cavity adapted to mate with the protrusion and grooves of said resinous rod, rotating the end cap to thereby rotate the resinous rod affixed thereto so that the end cap is threaded over the end of the resinous rod and the rod is rotated sufficiently to agitate and mix the resin and catalyst contained in the drilled hole.
Claim 2
Independent Claim
167 words
A method of installing a mine rock bolt comprising inserting a curable resin composition and catalyst into a drilled hole in the mine rock, inserting a fiber reinforced resinous rod having one or more continuous protrusions and/or grooves on the surface thereof and extending along the length of said resinous rod and wherein the fiber reinforcement in said protrusion and grooves follows the pattern of the protrusions and grooves around the said resinous rod such that at any point along the length of the rod the same fiber reinforcement is located in said protrusion and grooves, affixing the end of said resinous rod with an end cap having a cavity adapted to mate with the protrusion and grooves of said resinous rod, rotating the end cap to thereby rotate the resinous rod affixed thereto so that the end cap is threaded over the end of the resinous rod and the rod is rotated sufficiently to agitate and mix the resin and catalyst contained in the drilled hole.
Claim 3
Dependent Claim
22 words
The method of claim 1 wherein said fibers comprise glass, Kevlar, nylon, polyester, carbon, graphite, an amide, an imide or combinations thereof.
Claim 4
Dependent Claim
20 words
The method of claim 1 wherein the resin of said reinforcing rod is a polyester, polyurethane, vinyl ester or epoxy.
Claim 5
Dependent Claim
19 words
The method of claim 1 wherein an adhesive is used to join said end cap and said resinous rod.
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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) | 1984-01-27 | 1984-07-28 | 1985-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-27 | 1988-07-28 | 1989-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-27 | 1992-07-28 | 1993-01-27 | $7700.00 | Window Closed / Lapsed |