Screw
AssigneeToge-Dübel A. Gerhard KG
InventorAnton Gerhard
Life of this patent
Estimating the term…
Abstract
A screw (1), in particular a concrete screw, for being screwed into a drilled hole (20) comprises a core (2) with a pilot end (3), a lengthwise screw-in direction (5) and a central longitudinal axis (4); and a thread (7), which is designed in a single piece with the core (2) and which comprises a cutting thread (9), the cutting thread (9) extending from the pilot end (3) counter to the lengthwise screw-in direction (5) and having flanks (12, 13), which are substantially parallel to each other, and cutting notches (17), which are open radially outwards; and a standard thread (11), which adjoins the cutting thread (9), with the standard thread (11) substantially having a triangular cross-sectional shape.
Claims29
A screw for being screwed into a wall (25) of a drilled hole (20), comprising a core (2), which has a pilot end (3), a lengthwise screw-in direction (5) and a central longitudinal axis (4);
- and a thread (7), which forms a single piece with the core (2) and which comprises
- a cutting thread (9), which extends from the pilot end (3) in a direction opposite to the lengthwise screw-in direction (5), having cutting notches (17), which are open radially outwards;
- a standard thread (11), which adjoins the cutting thread (9) and substantially has a triangular cross-sectional shape;—wherein the cutting thread (9) has flanks (12, 13), which are substantially parallel to each other;
- wherein the core (2) is substantially cylindrical;
- and
- wherein the cutting thread (9) has a height S as compared to the outer circumference of the core (2);
- and
- wherein the standard thread (11) has a height N as compared to the outer circumference of the core (2), with S>N applying.
A screw for being screwed into a wall (25) of a drilled hole (20), comprising a core (2), which has a pilot end (3), a lengthwise screw-in direction (5) and a central longitudinal axis (4);
- and a thread (7), which forms a single piece with the core (2) and which comprises
- a cutting thread (9), which extends from the pilot end (3) in a direction opposite to the lengthwise screw-in direction (5), having cutting notches (17), which are open radially outwards;
- and
- a standard thread (11), which adjoins the cutting thread (9) and substantially has a triangular cross-sectional shape;
- wherein the cutting thread (9) has flanks (12, 13), which are substantially parallel to each other;
- wherein the core (2) is substantially cylindrical;
- wherein the cutting thread (9) has a height S as compared to the outer circumference of the core (2);
- and
- wherein the standard thread (11) has a height N as compared to the outer circumference of the core (2), with S>N applying.
A screw according to claim 25, wherein the standard thread (11) has flanks (21, 22), which corner by an angle a to which applies:
- 50°≦a≦80°.
Dependencies are inferred from the claim text.