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NTIS 바로가기국가/구분 | United States(US) Patent 등록 |
---|---|
국제특허분류(IPC7판) |
|
출원번호 | US-0440474 (1974-02-07) |
발명자 / 주소 |
|
인용정보 | 피인용 횟수 : 9 인용 특허 : 0 |
An improved railroad tie member is formed of two wooden half-ties which are secured together with one or more reverse threaded bolts arranged in parallel with the tracks. The bolts are preferably inserted in the tie halves whereby the bolts may be turned to resecure the two halves while the tie asse
An improved fastening device for securing two timbers or the like together to form a single strength member, comprising a hollow bolt means having external oppositely-directed threads on each end and a non-threaded center section adapted to receive and rotatably engage a turning means inserted there
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