F - Mech Eng,Light,Heat,Weapons – 16 – B
Patent
F - Mech Eng,Light,Heat,Weapons
16
B
F16B 25/02 (2006.01) B23G 9/00 (2006.01)
Patent
CA 2738182
In the case of a thread-tapping screw (1), especially a concrete screw (2), including a screw head (3), a screw shank (5) and a thread (6) that is formed on at least part of the screw shank (5), whereby at least one longitudinal groove (9) is formed on a front section (7) of the screw (1), starting at the end (4) of the screw on the screw shank (5), and the at least one longitudinal groove (9) is delimited on the screw shank (5) by two lengthwise sides (10) running essentially radially relative to a longitudinal axis (8) of the screw (1), it is the objective that the tightening torque needed when the screw (1) is being screwed into a drilled hole should be slight, and that the screw (1) should be produced cost-effectively. Eeach longitudinal groove (9), at least one lengthwise side (10) is oriented at an angle .alpha. between 1° and 20° relative to a straight line running parallel to the longitudinal axis (8) of the screw (1), and/or the at least one longitudinal groove (9) is configured on the screw shank (5) so as to be helical.
Beckert Michael
Gstach Peter
Neumaier Tobias
Hilti - Aktiengesellschaft
Riches Mckenzie & Herbert Llp
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