Self-Tapping Concrete Screw Driving With Clutch Release Control

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Solution Overview

Problem

Existing rotary drive tools for screwing self-tapping concrete screws into concrete risk damaging the screws or the internal thread due to excessive torque when the screw head protrudes significantly, and there is a need for a tool that ensures a fixed or adjustable distance between the screw head and the concrete surface.

Innovation Solution

A rotary drive tool with a positive-lock coupling and a clutch release mechanism, featuring a tubular clutch releaser with an axial stop, ensures a fixed or adjustable distance between the screw head and the concrete surface by using a form-lock coupling and a clutch release mechanism to disengage from the screw head after reaching the desired depth.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the concrete screw is screwed into the drilled hole using a rotary drive tool, then the screw can be secured into the concrete structure, but the screw or the internal thread may be damaged due to excessive torque when the screw head protrudes significantly from the concrete surface

Engineering Contradiction:

Improvesecure connection of concrete screwVSAvoidexcessive torque damage to screw or internal thread

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The clutch release mechanism acts as an intermediary between the rotary drive tool and the concrete screw. It includes a clutch member that can engage with the screw head and a release member that disengages the clutch member from the screw head when the screw head reaches a predetermined position, thereby preventing excessive torque from damaging the screw or internal thread

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The clutch release mechanism provides feedback about the screwing depth through the release member that is actuated by the screw head's position. When the screw head protrudes by a predetermined amount, the release member engages to disengage the clutch member, automatically stopping the screwing process before damage occurs

Inventive Principle:

Principle #23Feedback

2Manufacturing precision

If the holes for concrete screws are drilled to a specific depth using a stop on the drill bit, then the screw head can be positioned at a desired distance from the concrete surface, but the concrete screws will be subjected to strong torque that may damage the screw or internal thread

Engineering Contradiction:

Improvefixed distance of screw head from concrete surfaceVSAvoidstrong torque damage to screw or internal thread

Core Design Contradiction:

Manufacturing precisionVSObject-affected harmful factors

Solution Approach 1:

The clutch release mechanism serves as an intermediary that controls the torque transmission. The release member acts as a mechanical stop that disengages the clutch member when the screw head reaches the predetermined position, preventing excessive torque from being applied to the screw or internal thread while maintaining the desired screw head position

Inventive Principle:

Principle #24Intermediary (Mediator)

3Productivity

If a generic rotary drive tool is used for screwing in concrete screws, then the screwing process can be completed, but there is no control over the protrusion distance of the screw head from the concrete surface

Engineering Contradiction:

Improvescrewing process completionVSAvoidprotrusion distance of screw head from concrete surface

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The clutch release mechanism introduces dynamic control to the screwing process. The release member is designed to disengage the clutch member at a predetermined screwing depth, automatically controlling the protrusion distance of the screw head from the concrete surface while maintaining productivity

Inventive Principle:

Principle #15Dynamics

Data Source

PatentEP3825064B1Method for screwing a self-tapping concrete screw

Publication Date: 2025.08.06 FISCHERWERKE ARTUR FISCHER GMBH & CO KG

Figure 1~2
Figure 3

AI summary

For screwing a concrete screw (2) into a screw hole (3) in concrete (4), the invention proposes a rotary drive tool (1) with a socket (6) in a tubular clutch release bearing (8), which, upon contact with a retaining ring (11) inside the clutch release bearing (8), disengages the socket (6) from a screw head (5) of the concrete screw (2) and thereby terminates the screwing.