Wood crossties with cellular plastic inserts
AssigneeThe Dow Chemical Company
InventorLester J. Dankert
Life of this patent
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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.
Claims4
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.
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.
Dependencies are inferred from the claim text.