US 12,221,993 B2
Screw with axial thread play
Roland Schneider, Schlins (AT)
Assigned to Hilti Aktiengesellschaft, Schaan (LI)
Appl. No. 17/764,353
Filed by Hilti Aktiengesellschaft, Schaan (LI)
PCT Filed Oct. 20, 2020, PCT No. PCT/EP2020/079421
§ 371(c)(1), (2) Date Mar. 28, 2022,
PCT Pub. No. WO2021/083717, PCT Pub. Date May 6, 2021.
Claims priority of application No. 19206565 (EP), filed on Oct. 31, 2019.
Prior Publication US 2022/0373016 A1, Nov. 24, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. F16B 35/04 (2006.01); F16B 33/02 (2006.01)
CPC F16B 33/02 (2013.01) 18 Claims
OG exemplary drawing
 
1. A screw comprising:
a shank having a tip, a rear end located opposite the tip, and a longitudinal axis extending through the tip and through the rear end; and
a screw thread helix arranged on the shank and having a screw thread ridge for engaging into an internal screw thread groove;
the screw thread helix having axial tipward play with respect to the shank, the tipward play increasing as an axial distance of the screw thread helix from the tip increases;
wherein the screw is a concrete tapping screw, and the shank is a steel shank.