Tool Holder With Hard Cutting Elements for Wooden Handle Threading
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Solution Overview
Problem
Existing holders for tools, particularly those with plastic coupling pieces, face challenges in securely connecting to different types of handles, especially wooden handles with smooth ends, as internal screw threads become blunt with frequent use, leading to a less secure threaded connection.
Innovation Solution
A holder with a coupling portion made of a harder material than the retaining portion, featuring projecting cutting elements that can cut external screw threads during rotary introduction, allowing both smooth and threaded handle ends to be securely connected, with the retaining portion made of plastic for easy integration with plastic components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a holder with internal screw thread is used to connect to handles, then threaded handles can be securely connected, but the internal screw thread becomes blunt after frequent use of wooden handles, leading to less secure connections
Solution Approach 1:
The holder is divided into two functional zones: a cutting portion with hard cutting elements for cutting screw threads into wooden handles, and a retaining portion with internal screw thread for securing threaded handles. This segmentation allows each zone to perform its specific function optimally without interfering with the other, preventing the blunting problem.
Solution Approach 2:
Different materials with different hardness properties are used in different parts of the holder. The cutting portion uses a harder material (first material) to cut threads into soft wooden handles, while the retaining portion uses a softer material (second material) to engage with threaded handles. This local differentiation of material properties solves the wear and blunting issue.
2Ease of manufacture
If a harder material is used for the cutting portion to cut screw threads into wooden handles, then thread cutting effectiveness is improved, but the holder becomes less compatible with plastic coupling pieces that require softer materials
Solution Approach 1:
The holder is constructed as a composite structure combining two different materials: a harder first material for the cutting portion and a softer second material for the retaining portion. This composite construction allows the holder to simultaneously achieve effective thread cutting in wooden handles and compatibility with plastic coupling pieces, resolving the material compatibility conflict.
3Stability of the object's composition
If a clamping system is added to the holder to prevent movement along the axis of rotation, then connection stability is improved, but the internal screw thread becomes blunt faster due to increased friction and wear
Solution Approach 1:
The holder separates the functions of thread cutting, thread engagement, and axial clamping into distinct structural elements. The cutting elements cut the thread, the internal screw thread engages and secures the handle, and separate clamping elements prevent axial movement. This segmentation prevents the blunting of the internal screw thread while maintaining connection stability.
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
The holder effectively connects various handle types by cutting external screw threads with minimal wear on the cutting elements, ensuring a secure and long-lasting connection, even with handles made of softer materials like wood, while being easily producible and connectable to tools with plastic coupling pieces.
Implementation Method 1
one or more projecting cutting elements for cutting complementary screw thread by means of which the one or more cutting elements are releasably connectable during the rotary introduction of a handle end into the space
Data Source
AI summary
Holder (1) for releasably connecting a handle to a tool (2), in which the holder (1) comprises a space (3) in which a handle end is introducible, in which this space (3) comprises a wall surface with one or more projecting cutting elements (5a, 5b) for cutting complementary screw thread by means of which the one or more cutting elements (5a, 5b) are releasably connectable, in which the holder (1) comprises a coupling portion (6) comprising the one or more cutting elements (5a, 5b) and a retaining portion (7), in which the coupling portion (6) is made of a first material comprising plastic and the retaining portion (7) is made of a second material, in which the hardness of the first material is greater than the hardness of the second material.