|국가/구분||United States(US) Patent 등록|
|미국특허분류(USC)||85/42 ; 403/296 ; 238/37|
|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 assembly is installed in the track.
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 therein through one of said ends of said bolt means, said bolt means further being resiliently compressible to be inserted into a pre-drilled hole in one of said timbers smaller in diameter than the normal diameter of said bolt means.