发明授权
- 专利标题： Wood crossties with cellular plastic inserts
- 专利标题（中）： 带有多孔塑料插入物的木纹
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申请号： US748986申请日： 1976-12-09
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公开(公告)号： US4134546A公开(公告)日： 1979-01-16
- 发明人: Lester J. Dankert
- 申请人： Lester J. Dankert
- 申请人地址： MI Midland
- 专利权人： The Dow Chemical Company
- 当前专利权人： The Dow Chemical Company
- 当前专利权人地址： MI Midland
- 主分类号： E01B9/16
- IPC分类号： E01B9/16 ; E01B31/26 ; F16B13/14
摘要：
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.
公开/授权文献
- US5192509A Apparatus for automatic titration 公开/授权日：1993-03-09