Corrosion resisting screw with cutting insert
AssigneeToge-Dübel A. Gerhard KG
InventorAnton Gerhard
Life of this patent
Estimating the term…
Abstract
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).
Claims7
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″).
Dependencies are inferred from the claim text.