Twisted Hexagonal Wrench for Secure Recess Contact
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional hexagonal wrenches fail to achieve secure contact with hexagonal recesses, leading to ineffective rotation due to single-point contact between straight ridges and recess sides, and alternative designs with inclined driving portions still face issues with uniform deformation and contact.
Innovation Solution
A hexagonal wrench with a twisted and equal-sided column function end, featuring a root section, middle section, and end section with a maximum twist angle of up to 30 degrees, ensuring multiple contact points between the function end and the recess, allowing for efficient rotation without uniform deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional hexagonal wrench with straight ridges is used, then the structure is simple and easy to manufacture, but the contact between the function end and the recess is only at single points, leading to ineffective rotation
Solution Approach 1:
The function end is designed with a twisted column shape instead of straight ridges, creating a curved surface that contacts the recess sides along lines or areas rather than at single points. This curved geometry enables multiple contact points during rotation, significantly improving contact effectiveness and torque transmission.
Solution Approach 2:
The twisted column surface can be conceptually divided into multiple sections along its length, each creating contact points at different positions on the recess sides. This segmentation of the contact interface ensures continuous engagement throughout the rotation cycle.
2Reliability
If an inclined driving portion with hexagonal cross section is used, then multiple contact points are achieved, but uniform deformation occurs during rotation reducing effectiveness
Solution Approach 1:
The twisted column introduces asymmetric geometry relative to the rotation axis, creating non-uniform contact pressure distribution. This asymmetric contact pattern prevents uniform deformation of the recess sides, allowing the object to rotate more effectively without binding.
3Reliability
If the function end is twisted with a maximum twist angle of 30 degrees or less, then multiple contact points are achieved, but the manufacturing complexity increases
Solution Approach 1:
By limiting the maximum twist angle to 30 degrees or less, the patent optimizes the balance between achieving multiple contact points and maintaining manufacturability. This parameter constraint ensures the twisted geometry provides sufficient contact effectiveness while remaining feasible for conventional manufacturing processes.
Data Source
AI summary
A hexagonal wrench includes a body with at least one function end which is a twisted and equal-sided column. The twisted and equal-sided column includes a root section, an end section and a middle section which formed between the root section and the end section. A maximum twist angle is defined between the root section and the end section, and the maximum twist angle is equal to or less than 30 degrees. The root section has a first cross section and the end section has a second cross section. The first cross section is larger than second cross section.