Angle Adjusting Mechanism for Hand Tools with Multi-Tooth Engagement
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Solution Overview
Problem
Conventional hand tools with angle adjusting mechanisms suffer from insecure engagement of the tool head due to engagement with only one tooth, leading to instability and easy wear of teeth.
Innovation Solution
A hand tool design featuring a handle with pivot ears, a receiving groove, and a controlling rod with an inclined plane, an engaging member with inner and side teeth, and a spring to securely engage the tool head's arc teeth, ensuring stable adjustment and prevention of abrasion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the abutting member engages with only one tooth of the tool head, then the structure is simple, but the engagement is insecure and the tooth wears easily
Solution Approach 1:
The engaging member is segmented into multiple teeth (first tooth, second tooth, third tooth) that can simultaneously engage with multiple corresponding teeth on the pivoting portion. This segmentation distributes the engagement load across multiple contact points, improving reliability while maintaining structural simplicity
Solution Approach 2:
Multiple engagement points are merged into a single engaging member structure. The first tooth, second tooth, and third tooth of the engaging member work together as an integrated unit to secure the pivoting portion, combining multiple engagement functions into one component
2Device complexity
If the abutting member engages with only one tooth, then the structure is simple, but the tooth wears easily
Solution Approach 1:
The engagement interface is segmented into multiple tooth pairs instead of a single contact point. This segmentation distributes mechanical stress across multiple teeth, reducing wear on each individual tooth and extending the service life of the engagement mechanism
Solution Approach 2:
Different teeth of the engaging member have different geometries (first tooth with first engaging surface, second tooth with second engaging surface, third tooth with third engaging surface) optimized for specific engagement requirements, improving local durability and wear resistance at each contact point
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 provides stable and secure adjustment of the tool head's angle relative to the handle, preventing wear and ensuring secure engagement, thus enhancing the tool's usability and durability.
Implementation Method 1
a spring disposed in the longitudinal hole of the handle and mounted around the post of the engaging member, the spring having a diameter larger than a width of the inner tooth part
Implementation Method 2
an inclined plane sloped toward the recess; the inclined plane of the controlling rod abutting against the post
Data Source
AI summary
A hand tool with an angle adjusting mechanism includes a handle, a tool head, a controlling rod and an engaging member. The handle has a receiving groove defined at one end thereof, a transverse hole defined in one lateral side and a longitudinal hole defined in a bottom of the receiving groove. The tool head has a pivoting portion assembled in the receiving groove of the handle. The pivoting portion has a low of teeth defined at an outer periphery thereof. The controlling rod is disposed in the transverse hole of the handle. The engaging member has a post and an engaging head. The engaging head has an inner tooth part and two side teeth disposed at opposite sides of the inner tooth part. The inner tooth part and the side teeth form a substantially concave shape to engage with the teeth of the pivoting portion.