Core Bit Coupling Sleeve to Prevent Thread Jamming

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Solution Overview

Problem

The threaded connection between a core bit and a drill motor is prone to jamming during drilling, leading to premature deterioration of the core bit and safety risks, especially when engaging with reinforced concrete.

Innovation Solution

A drill motor design featuring a tubular section with an external profile and internal thread, combined with a rotatable shaft and a concentric sleeve with a positive fit, uses a locking device to transmit power through the sleeve rather than the thread, allowing for easy assembly and disassembly without damaging the core bit.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If a threaded connection is used between the core bit and drill motor, then the connection can be easily assembled, but the threaded connection is prone to jamming during drilling operations

Engineering Contradiction:

Improveease of assemblyVSAvoidrisk of jamming

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The connection system is divided into two independent functional components: a threaded connection for assembly/disassembly and a bayonet locking mechanism for secure power transmission. This segmentation allows each component to perform its specialized function without the drawbacks of a pure threaded connection.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The bayonet locking mechanism provides dynamic security by engaging positive locking tabs that prevent rotational movement and jamming during drilling, while still allowing quick release when needed. The locking mechanism can be engaged or disengaged as required by the operational phase.

Inventive Principle:

Principle #15Dynamics

2Reliability

If the threaded connection is continually tightened during drilling, then the connection remains secure, but the connection can become irreversibly jammed

Engineering Contradiction:

Improveconnection securityVSAvoidease of disassembly

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The bayonet locking mechanism is engaged before drilling begins, establishing a secure connection that prevents jamming. This preliminary locking action eliminates the need for continual tightening during drilling and ensures the connection remains secure without risk of irreversible jamming.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The bayonet locking mechanism acts as an intermediary between the threaded connection and the drilling operation. It provides the secure mechanical coupling needed for power transmission while preventing the threaded connection from becoming jammed, thus mediating between security requirements and ease of disassembly.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Productivity

If the core bit becomes stuck in the material to be drilled, then drilling continues, but the threaded connection cannot be released

Engineering Contradiction:

Improvedrilling continuityVSAvoidease of disassembly

Core Design Contradiction:

ProductivityVSEase of operation

Solution Approach 1:

The bayonet locking mechanism allows dynamic switching between locked and unlocked states. When the core bit becomes stuck, the locking mechanism can be quickly disengaged to release the core bit, enabling easy recovery without damaging the core bit connection.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The bayonet locking mechanism provides a safety cushion by preventing irreversible jamming of the threaded connection. Even if the core bit becomes stuck during drilling, the locking mechanism ensures the connection can still be released without force, cushioning against the harmful effect of complete immobilization.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

4Device complexity

If a pure threaded connection is used, then the structure is simple, but the core bit connection is destroyed upon jamming

Engineering Contradiction:

Improveconnection structureVSAvoidcore bit durability

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

Inventive Principle:

Principle #1Segmentation

Data Source

PatentEP4596151A1Drilling motor for a drill bit

Publication Date: 2025.08.06 EDT EURODIMA

Figure 1a~2
Figure 3a~3b
Figure 4a~4b

AI summary

Drill motor (1) for a drill bit (2), wherein the drill bit (1) has a connection (23) for the drill motor (1), wherein the connection (23) is formed by a tubular section (23) which has an outer profile (26) on the outside and an internal thread (27) on the inside, wherein the drill motor (1) has a rotary drive (30) with a rotatable shaft (31), wherein the shaft (31) has a tool holder (10), wherein the tool holder comprises an external thread (11) which can be connected to the internal thread (27) of the drill bit (2), wherein the tool holder (10) has a sleeve (12) which is arranged concentrically around the shaft (31), wherein the sleeve (12) has an internal tool section (13) which is designed to form a positive fit with the outer profile (26) of the drill bit (2), wherein the drill motor (1) has a releasable locking device (29),with which the sleeve (12) can be coupled to and decoupled from the shaft (31).