Self-tapping concrete screw
OwnerJan-Christian Becker, Oliver Hacker +2inventors
InventorsJan-Christian Becker, Oliver Hacker, Klaus Mayer, Marc Schaeffer
Life of this patent
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Abstract
In order to improve the holding force of a self-tapping concrete screw (1) in a hole (2) drilled in concrete (3), the invention proposes formation of the concrete screw (1) with two threads (8, 9) having different external diameters (d1, d2), the spacing (p1) of the thread (8) which has the smaller external diameter (d1) to the thread (9) which has the larger external diameter (d2) when seen from the front end (5) of the screw being smaller than the spacing (p2) of the thread (9) having the larger external diameter to the thread (8) having the smaller external diameter. The threads (8, 9) are preferably sawtooth threads.
Claims12
Self-tapping concrete screw for screwing into a hole drilled in concrete, characterised in that the concrete screw (1) has two threads (8, 9), in that the threads (8, 9) have different external diameters (d1, d2), and in that the spacing (p1, p2) of the threads (8, 9) from one another differs in the two directions along the axis of the concrete screw (1).
Self-tapping concrete screw (1) screwed into a hole (2) drilled in concrete (3), characterised in that the concrete screw (1) has two threads (8, 9), in that the threads (8, 9) have different external diameters (d1, d2), and in that the spacing (p1, p2) of the threads (8, 9) from one another differs in the two directions along the axis of the concrete screw (1).
Dependencies are inferred from the claim text.