Bit Holder Impact Protection for Deep Countersinking

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Solution Overview

Problem

Existing bit holders are prone to damage when screws are deeply countersunk in wood, leading to impact on the bit holder and potential mechanical failure.

Innovation Solution

A bit holder equipped with an impact load protection unit, featuring an inclined surface and a front surface, which absorbs and reduces the impact load when the bit holder impinges on the anchoring base, thereby protecting the fixing sleeve from damage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If a bit holder is used for deeply countersinking screws in wood, then the bit holder can perform the intended function, but the bit holder may receive impact loads that damage the mechanics

Engineering Contradiction:

Improvedeep countersinking capabilityVSAvoidbit holder durability

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The patent applies beforehand cushioning by providing a bit holder with an impact load protection unit that absorbs impact loads before they can damage the fixing sleeve. The protection unit is positioned to receive impact loads during deep countersinking operations, preventing direct transmission of harmful forces to the bit holder's mechanical components.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

2Productivity

If the bit holder impinges on the anchoring base during deep countersinking, then the attachment element can be inserted, but the impact load may cause mechanical damage to the bit holder

Engineering Contradiction:

Improveinsertion efficiencyVSAvoidimpact load damage

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent applies the intermediary principle by introducing an impact load protection unit as a mediator between the bit holder and the anchoring base. This protection unit absorbs and dissipates impact loads generated during impingement, preventing direct transmission of harmful forces to the bit holder's fixing sleeve while allowing the insertion operation to proceed.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If a protective structure is added to the bit holder, then the bit holder is protected from impact loads, but the device complexity increases

Engineering Contradiction:

Improveimpact protectionVSAvoidbit holder structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies segmentation by dividing the bit holder into functional modules: a fixing sleeve for securing the bit, an impact load protection unit for absorbing impact loads, and a bit receiving unit. This modular segmentation allows the protection function to be added as a distinct component, making the overall structure more manageable and maintainable while providing necessary protection.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS12280475B2Bit holder with impact load protection unit

Publication Date: 2025.04.22 WURTH INT AG

AI summary

A bit holder for holding a bit for coupling the bit with a drive tool, wherein the bit holder comprises a receiving unit which is configured for receiving the bit, a tool coupling which is configured for coupling with the drive tool, and an impact load protection unit which is configured for protecting from an impact load which is acting on the bit holder, in particular on a fixing sleeve of the bit holder, when impinging the bit holder on an anchoring base, when an attachment element which is to be driven by the bit, the drive tool and the bit holder, is inserted into the anchoring base.