Tool Bit Assembly with Magnetic Retention and Spring-Loaded Bead
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Solution Overview
Problem
Conventional hand tools with connecting shafts face difficulties in quickly alternating screw bits due to oil attachment and unstable engagement between the positioning bead and notch, leading to challenges in assembly and disassembly.
Innovation Solution
A tool bit assembly featuring a connecting shaft with a magnet, springs, and a cover with an incline surface that compresses and retains a positioning bead to securely engage and disengage screw bits, utilizing the magnetic force to prevent dropping during removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a positioning bead is used to engage with a notch for assembling the screw bit, then the assembly is achieved, but the engagement is not firm and stable when oil is attached to the user's hand
Solution Approach 1:
The positioning bead is made movable within the retaining hole through grooves (first groove, second groove, third groove) that allow it to move between a first position (engaged with the notch) and a second position (disengaged from the notch). This dynamic positioning enables easy assembly and disassembly while maintaining firm engagement during operation.
Solution Approach 2:
A magnet is introduced to replace pure mechanical engagement with magnetic attraction. The magnet, positioned at the bottom of the retaining hole, attracts the screw bit to ensure firm and stable engagement, preventing the positioning bead from slipping out even when oil is attached to the user's hand.
2Reliability
If the positioning bead is compressed firmly to ensure stable engagement, then the engagement becomes firm, but the assembly and disassembly process becomes complex
Solution Approach 1:
The retaining hole is divided into multiple functional zones with grooves (first groove, second groove, third groove) that guide the positioning bead's movement. These segmented structural elements work together to achieve simple yet effective assembly and disassembly operations.
Solution Approach 2:
The magnet automatically attracts the screw bit to ensure stable engagement without requiring additional fastening operations. The spring-loaded positioning bead automatically moves to engage or disengage from the notch, eliminating the need for complex manual operations.
3Device complexity
If a simple retaining hole structure is used, then the device structure remains simple, but the screw bit may drop down after disengagement
Solution Approach 1:
A magnet is placed at the bottom of the retaining hole to act as an intermediary that prevents the screw bit from dropping. The magnetic field provides continuous attraction force, ensuring the screw bit remains retained even when the positioning bead is in the disengaged position.
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
Enables secure and efficient assembly and disassembly of screw bits by ensuring firm engagement and automatic release, preventing tool bits from falling after disengagement.
Implementation Method 1
the magnet attracts the tool bit for preventing the tool bit from dropping down
Implementation Method 2
the recovering force of the first spring to push the magnet
Implementation Method 3
the cover is positioned via the elasticity of the second spring so as to keep the positioning bead engaging with the notch of the tool bit
Data Source
AI summary
A hand tool with bit release device includes a connecting shaft, a block, a positioning bead and a cover. When the user wants to insert a tool bit into the connecting shaft, the user pushes the tool bit into the connecting shaft directly and the positioning bead engages with the tool bit firmly. When the user wants to release the tool bit from the connecting shaft, the user moves the cover axially relative to the connecting shaft and the positioning bead disengages with the tool bit so that the tool bit is released from the connecting shaft.