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NTIS 바로가기국가/구분 | United States(US) Patent 등록 |
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국제특허분류(IPC7판) |
|
출원번호 | US-0617143 (1984-06-04) |
우선권정보 | DE-0054870 (1977-12-09) |
발명자 / 주소 |
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 | 피인용 횟수 : 15 인용 특허 : 2 |
A self-tapping screw. The core of the screw between adjacent threads has a constricted portion, the narrowestmost point thereof lying approximately in the center between the two adjacent threads. The core is tapered expanding outwardly from the constriction to the bases of the two adjacent threads.
1. A self-tapping screw formed by chipless rolling comprising an elongated core with threads thereon projecting radially outwardly therefrom having a large ratio between the outside diameter of said threads and the core diameter, a small thread angle on said threads and a small ratio between said ou
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