Quick-Release Drill Bit Assembly with Spring-Loaded Locating Bolt
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Solution Overview
Problem
Conventional tool assemblies for screwdrivers with detachable drill bits are limited by the use of C-shaped fasteners and specific groove positions, requiring elongation of components to adjust sliding distance, increasing manufacturing costs and reducing market competitiveness.
Innovation Solution
A tool assembly with a bit main body, sliding sleeve, spring, and locating bolt, where the spring pushes the locating bolt into an engaging groove, and the sliding sleeve's rear end bears against a flange to limit sliding displacement, effectively shortening component lengths and reducing manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the sliding sleeve and connecting end are elongated to adjust sliding distance, then the sliding displacement can be adjusted, but the manufacturing cost increases
Solution Approach 1:
The patent introduces a spring-loaded locating bolt mechanism that dynamically adjusts and limits the sliding displacement of the sliding sleeve. The locating bolt can move axially under spring force to engage with different positions on the connecting end, providing adjustable sliding distance without requiring elongation of the sliding sleeve or connecting end components.
Solution Approach 2:
The patent changes the parameter of sliding distance control from fixed geometric dimensions (length of components) to a variable mechanism using spring force and locating bolt position. This allows the sliding distance to be adjusted by changing the spring pre-compression or locating bolt engagement position rather than changing component lengths, reducing manufacturing cost.
2Reliability
If the C-shaped fastener and groove positions are used to limit sliding displacement, then the sliding distance can be controlled, but the component lengths must be increased which reduces market competitiveness
Solution Approach 1:
The patent replaces the static C-shaped fastener and groove positioning system with a dynamic spring-loaded locating bolt mechanism. The locating bolt can actively engage and disengage from different positions on the connecting end, providing reliable sliding displacement control without requiring increased component lengths.
Solution Approach 2:
The patent extracts the sliding displacement control function from the structural dimensions of the sliding sleeve and connecting end, and implements it through a separate locating bolt mechanism. This separates the control function from the main component geometry, allowing compact design while maintaining reliable displacement control.
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 design lowers manufacturing costs and enhances market competitiveness by simplifying the tool assembly's structure and reducing component lengths while maintaining functionality.
Implementation Method 1
The spring is configured to push the locating bolt into the engaging groove
Implementation Method 2
a magnetic unit is secured on a front end of the connecting portion when needed
Data Source
AI summary
A tool assembly for screwdriver with quick-release drill bits includes a bit main body, a sliding sleeve, a spring and a locating bolt. The bit main body has a shaft, and an outer periphery of a front end of the shaft has a plurality of axial cutting surfaces to form a connecting portion with a polygonal cross section. The sliding sleeve comprises a rear end and a front end, and a driving hole with a polygonal cross section axially penetrates through the sliding sleeve. An engaging groove formed at an inner periphery of the driving hole is located adjacent to the rear end of the sliding sleeve. The spring, the locating bolt and the engaging groove are configured to effectively shorten lengths of the connecting portion of the main body and the sliding sleeve thus lowering the manufacturing cost and increasing the competitive advantage in the market.