IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0831707
(1700-01-01)
|
우선권정보 |
DE-0052338 (1998-11-13) |
국제출원번호 |
PCT/EP99/08458
(1999-11-04)
|
발명자
/ 주소 |
|
출원인 / 주소 |
|
대리인 / 주소 |
Browdy and Neimark, P.L.LC.
|
인용정보 |
피인용 횟수 :
9 인용 특허 :
4 |
초록
▼
A corrosion-resisting, self-tapping screw (1), in particular a concrete screw, to be driven into a bore, which has a wall, comprises a substantially cylindrical core (2) of corrosion-resisting metal with a central longitudinal axis (8); a thread (5), which is integral with the core (2); and at least
A corrosion-resisting, self-tapping screw (1), in particular a concrete screw, to be driven into a bore, which has a wall, comprises a substantially cylindrical core (2) of corrosion-resisting metal with a central longitudinal axis (8); a thread (5), which is integral with the core (2); and at least one cutting element (9), which has at least one cutting head (12) for cutting engagement with the wall of the bore; the at least one cutting element (9) being inserted in the core (2), tightly joined thereto and consisting of a hardened metal, and the at least one cutting head (12) being arranged in the thread (5).
대표청구항
▼
1. A corrosion-resisting, self-tapping screw, in particular a concrete screw, to be driven into a wall of a bore, comprising a substantially cylindrical core (2) of corrosion-resisting metal, which has a central longitudinal axis (8); a thread (5; 5"), which is integral with the core (2); and a
1. A corrosion-resisting, self-tapping screw, in particular a concrete screw, to be driven into a wall of a bore, comprising a substantially cylindrical core (2) of corrosion-resisting metal, which has a central longitudinal axis (8); a thread (5; 5"), which is integral with the core (2); and at least one cutting element (9'; 9"), which has at least one cutting head (12'; 12") for cutting engagement with the wall of the bore; with the at least one cutting element (9'; 9") being inserted in the core (2), being tightly joined thereto, and consisting of a metal which is harder than the cylindrical core of the screw; and with the at least one cutting head (12; 12'; 12") being disposed only in the thread (5; 5"); wherein the at least one cutting head (12'; 12") projects over the thread (5; 5") radially to the central longitudinal axis (8); wherein the core (2) comprises at least one externally open bore (17; 17"), which is radial to the central longitudinal axis (8); and wherein the at least one cutting element (9'; 9") is a cutting pin insert (18; 18") with at least one cutting head (12'; 12"), which is formed in a single piece therewith; with the cutting pin insert (18; 18") being held in the at least one bore (17; 17"). 2. A screw according to claim 1, wherein the cutting head (12'; 12") projects over the thread (5; 5") by 0.05 to 0.4 mm. 3. A screw according to claim 1, wherein each cutting head (12') comprises cutting element flanks (26) which are substantially parallel to each other. 4. A screw according to claim 3, wherein a lead angle of the thread (5") and a lead angle of the cutting element flanks (26) are substantially equal, each referred to a plane (15) perpendicular to the central longitudinal axis (8). 5. A screw according to claim 1, wherein the cutting element (9') is substantially cylindrical. 6. A screw according to claim 1, wherein the cutting head (12") has a rib-type shape. 7. A screw according to claim 1, wherein the cutting head (12") projects over the thread (5").
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