Screw element, actuating tool, screw system and use

The innovative design of screw elements with elliptically curved surfaces and chamfered conical sections addresses the challenges of torque transmission and compatibility, enhancing efficiency and ease of use in screw systems.

WO2026131469A1PCT designated stage Publication Date: 2026-06-25SPAX INT GMBH & CO KG
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
SPAX INT GMBH & CO KG
Filing Date
2025-12-11
Publication Date
2026-06-25

AI Technical Summary

Technical Problem

Existing screw elements and actuating tools face challenges in achieving efficient torque transmission, compatibility with various operating tools, and ease of handling and assembly.

Method used

The design of screw elements with alternating elliptically curved first and second surfaces forming projections and recesses, along with a chamfered conical section, enhances torque transmission and compatibility with actuating tools, minimizing the cam-out effect and increasing the effective area for force application.

Benefits of technology

This design improves torque transmission efficiency, reduces the cam-out effect, and ensures compatibility with various actuating tools, including those with internal hexagon and T-Star® plus drives, while maintaining a balanced relationship between penetration depth and installation space.

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Abstract

The present invention relates to a screw element (1) having a force application point (8) for an actuating tool (9), wherein the force application point (8) has a plurality of projections (10) and recesses (11) arranged in a distributed manner over a circumference about a central axis (M), wherein the projections (10) and recesses (11) are formed by alternately merging first surfaces (12) and second surfaces (13), wherein the first surfaces (12) are elliptically curved, and wherein the ellipses (14) on which a curvature of the first surfaces (12) is based are oriented radially with respect to the central axis (M) with a shorter ellipse axis. A screw element, which guarantees improved torque transmission with the best possible compatibility with known force application points, is achieved by virtue of the second surfaces (13) each having a first circular-arc-shaped partial surface (13a) and a second circular-arc-shaped partial surface (13b).
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