Power Tool Bit Mounting Mechanism Eliminating Ring Spring
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Solution Overview
Problem
Existing power tool bit mounting systems are complex and require a ring spring to manage the movement of steel balls, increasing the number of parts and complicating the structure.
Innovation Solution
A power tool design that uses a cylindrical bit holding member with a through hole and a cylindrical operating member, where the movement preventing portion moves between a preventing and allowing position, allowing the tool bit to be secured without a ring spring, simplifying the structure while maintaining ease of operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a ring spring is used to bias the steel ball into engagement with the groove of the driver bit, then the steel ball can be moved axially into position to face the movement preventing portion, but the number of parts increases and the structure becomes complicated
Solution Approach 1:
The invention extracts and eliminates the ring spring from the mounting device, replacing the complex spring-based axial positioning mechanism with a simpler geometry-based solution where the inclined surface of the steel ball directly interacts with the cam surface of the operating sleeve to achieve axial movement without additional biasing components
Solution Approach 2:
The steel ball's own spherical geometry and inclined surface serve the function previously requiring the ring spring, where the ball's shape allows it to be pushed axially by the operating sleeve's cam surface during insertion and removal operations, making the system self-sufficient without external biasing mechanisms
2Reliability
If the steel ball is prevented from moving outward radially by a movement preventing portion, then the steel ball remains engaged with the groove, but the operating sleeve must be designed with additional features increasing complexity
Solution Approach 1:
The invention merges the movement preventing function directly into the operating sleeve's basic structure by forming the cam surface and axial movement guiding features as integral parts of the sleeve body, eliminating the need for separate movement preventing portions or additional retaining features
Solution Approach 2:
The operating sleeve is designed to perform multiple functions simultaneously: it guides the steel ball radially outward during insertion, pushes the steel ball axially via its cam surface, and prevents radial inward movement during operation, all through its basic cylindrical structure with minimal features
3Device complexity
If a cylindrical operating member is used to move the engaging member between positions, then the structure is simplified compared to traditional mechanisms, but the movement control precision must be maintained
Solution Approach 1:
The invention uses the spherical geometry of the steel ball in conjunction with the cam surface of the operating sleeve to automatically ensure precise positioning and engagement, where the curved surfaces naturally guide the interaction and eliminate the need for complex precision machining of flat surfaces or adjustable mechanisms
Solution Approach 2:
The engaging mechanism uses the inherent geometric properties of the spherical steel ball and the cam surface to self-regulate and maintain precise positioning during operation, where the interaction between these two geometric features automatically ensures correct engagement without requiring external precision control systems
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 tool bit can be automatically secured and easily mounted or removed without a ring spring, reducing the number of parts and simplifying the structure while maintaining operational ease.
Implementation Method 1
a biasing member which applies a biasing force to the operating member so as to hold the movement preventing portion in the movement preventing position
Data Source
AI summary
A power tool includes a tool bit, a tool holder, a bit holding member, a bit mounting hole, a through hole, an outside opening, a bit mounting hole side opening, an engaging member, a cylindrical operating member, a movement preventing portion, a biasing member, a first engaging region, a second engaging region, and a third engaging region. As the first, the second and the third engaging regions respectively cooperate, the tool bit can be automatically secured to the bit holding member by inserting the tool bit into the bit mounting hole of the bit holding member. Mounting and removing of the tool bit can be achieved without a ring spring.