US4134546A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wood crossties with cellular plastic inserts
Assignee: Dow Chemical Co
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Filing: 1976-12-09
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Granted: 1979-01-16
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Expires: 1996-12-09
Abstract
Abstract A wooden structure incapable of holding a fastening device is restored by boring a hole of a desired size into the structure, cleaning the hole, and introducing a cellular plastic insert of a suitable size, so that the insert can hold a fastening device driven thereinto. The method is particularly useful for restoring a "spike-killed" railroad crosstie; the insert is composed of cellular high density polyethylene having average bulk density from about 15 to 50 pounds per cubic foot.
Inventors
- 👤 Lester J. Dankert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:13
CPC Classifications
E; E01; E01B; E01B31/00; E01B31/20; E01B31/26; E01B9/00; E01B9/02; E01B9/04; E01B9/14; E01B9/16; F; F16; F16B; F16B13/00; F16B13/14; F16B13/141
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
70 words
Method for restoring a wooden structure incapable of holding a fastening device, which comprises the steps of boring a hole of a desired size into said structure, cleaning said hole, and introducing a cellular plastic insert into said hole, said insert being of a size greater than that of said hole so as to cause a friction fit therebetween, so that said insert can hold said fastening device driven thereinto.
Claim 2
Dependent Claim
70 words
Method for restoring a wooden structure incapable of holding a fastening device, which comprises the steps of boring a hole of a desired size into said structure, cleaning said hole, and introducing a cellular plastic insert into said hole, said insert being of a size greater than that of said hole so as to cause a friction fit therebetween, so that said insert can hold said fastening device driven thereinto.
Claim 3
Dependent Claim
29 words
The method of claim 1 wherein the insert is composed of cellular high density polyethylene and have average bulk density from about 15 to 50 pounds per cubic foot.
Claim 4
Dependent Claim
23 words
The method of claim 1 wherein the insert is adhesively bonded to the wall of said hole to completely seal the interface therebetween.
Claim 5
Dependent Claim
78 words
Method for restoring a spike-killed railroad crosstie incapable of holding a rail fastening device, which comprises the steps of boring a hole of a desired size into said crosstie, cleaning said hole, and introducing a generally elongate solid body of cellular plastic insert into said hole, said insert being of a size greater than that of said hole so as to cause a friction fit therebetween, so that said insert can hold said rail fastening device driven thereinto.
Claim 6
Dependent Claim
78 words
Method for restoring a spike-killed railroad crosstie incapable of holding a rail fastening device, which comprises the steps of boring a hole of a desired size into said crosstie, cleaning said hole, and introducing a generally elongate solid body of cellular plastic insert into said hole, said insert being of a size greater than that of said hole so as to cause a friction fit therebetween, so that said insert can hold said rail fastening device driven thereinto.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-01-15 | 1982-07-17 | 1983-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-15 | 1986-07-17 | 1987-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-15 | 1990-07-17 | 1991-01-16 | $7700.00 | Window Closed / Lapsed |