Threaded Rod Insertion With Drive Sleeve Friction Reduction

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing screwing systems for inserting threaded rods into substrates face issues of high internal friction and heat generation, leading to mechanical stress and potential failure, especially when pre-drilling is avoided.

Innovation Solution

A screwing system with a carriage-mounted drive sleeve that engages the threaded rod via a profiled inner circumference, allowing for a positive connection that minimizes friction by converting rotational movement into translational movement, using a hydraulic or electric rotary drive to insert the rod through a threaded sleeve.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the threaded rod is rotated through a positive connection inside the tool, then the threaded rod can be driven into the substrate, but high internal friction and heat generation occur leading to mechanical stress and potential failure

Engineering Contradiction:

Improvereliability of screwing systemVSAvoidinternal friction and heat generation

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent replaces the conventional positive connection mechanical system with a magnetic field-based system. The threaded rod is magnetized and held in the drive sleeve through magnetic attraction, eliminating the need for mechanical threading or gripping mechanisms that generate high friction. The magnetic field provides secure holding during rotation while allowing smooth extraction afterward, significantly reducing internal friction and heat generation in the drive sleeve.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Strength

If the drive sleeve is designed to securely hold the threaded rod, then positive engagement is achieved, but internal friction increases causing mechanical stress

Engineering Contradiction:

Improvepositive engagement strengthVSAvoidinternal friction

Core Design Contradiction:

StrengthVSObject-generated harmful factors

Solution Approach 1:

The magnetic field substitution eliminates mechanical contact between the drive sleeve and threaded rod during the driving phase. The magnetized threaded rod is held securely by magnetic attraction without physical gripping surfaces that would generate friction. This maintains strong positive engagement while eliminating the friction problems inherent in mechanical gripping systems.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the physical state of the threaded rod by magnetizing it, transforming it from a non-magnetic to a magnetically active state. This parameter change enables the threaded rod to interact with the drive sleeve through magnetic fields rather than mechanical contact, fundamentally altering the engagement mechanism to reduce friction while maintaining strength.

Inventive Principle:

Principle #35Parameter changes

3Productivity

If the threaded rod is screwed in without pre-drilling, then assembly time is reduced, but the screwing process becomes more demanding on the system

Engineering Contradiction:

Improveassembly speedVSAvoidscrewing power requirement

Core Design Contradiction:

ProductivityVSPower

Solution Approach 1:

The magnetic field system reduces the power required for screwing without pre-drilling by eliminating frictional losses in the drive mechanism. The magnetized threaded rod rotates smoothly within the drive sleeve under magnetic holding, requiring less torque and power compared to conventional mechanical gripping systems. This enables efficient direct screwing into substrates without pre-drilling while maintaining reasonable power requirements.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

Reduces wear and assembly time, enabling faster and more efficient insertion of threaded rods into substrates with reduced mechanical stress and heat generation, suitable for applications like temporary bridge foundations.

Implementation Method 1

The threaded rod (2) is magnetized and held in the drive sleeve (13) by means of a magnetic field

Methodology Applied

Scientific EffectMagnetic field: Magnetic Field

Implementation Method 2

a component with an internal thread is arranged between the drive unit and the substrate, which converts the rotational movement of the drive sleeve into a translational movement of the threaded rod

Methodology Applied

Scientific EffectThread mechanism: Screw

Data Source

PatentEP4357532B1Method of inserting a threaded rod into a base, and insertion system therefor

Publication Date: 2025.10.15 SPINNANKER GMBH

Figure 1~2
Figure 3~4
Figure 5~6

AI summary

A screw-in system (1) for inserting a threaded rod (2) axially into a substrate (3), comprising a drive machine (5) which rotates a drive sleeve (13), wherein the threaded rod (2) can be inserted into the drive sleeve (13) arranged on the drive machine (5), which can be positively connected to the threaded rod (2) and thus rotates the threaded rod (2), wherein a component (19) with an internal thread is fixed between the drive machine (5) and the substrate (3), which converts the rotary movement of the drive sleeve (13) into a translational movement of the threaded rod (2), wherein the screw-in machine (5) is mounted on a slide (8) which is movable relative to the component (19).