Stud Bolt Anti-Theft Design via Large Diameter Portion
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Solution Overview
Problem
Conventional stud bolt coupling structures are vulnerable to separation and theft due to exposed double nuts and lock plates, which can be easily manipulated with tools.
Innovation Solution
A stud bolt design featuring a first thread portion, a second thread portion, an engagement portion, and a large diameter portion with a circular cross-section, where the large diameter portion is positioned between the threads and prevents tool engagement, ensuring the stud bolt cannot be rotated and thus securing the integrated members.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a double nut and lock plate are used to fix the stud bolt, then the fixation strength is improved, but the vulnerability to tool engagement and theft increases
Solution Approach 1:
The harmful double nut and lock plate components are completely removed from the system. Instead, a large diameter portion with a circular cross-section is extracted as the key protective feature, which cannot be engaged by conventional tools while maintaining fixation strength through the nut and thread portions.
Solution Approach 2:
Instead of using conventional hexagonal shapes that are easily engaged by tools, the invention inverts the approach by using a circular cross-section for the large diameter portion. This circular shape fundamentally resists tool engagement while the fixation function is maintained through the threaded portions and nut assembly.
2Reliability
If the large diameter portion has a circular cross-section, then the stud bolt cannot be rotated by tools, but the ease of assembly is reduced
Solution Approach 1:
The stud bolt is segmented into distinct functional portions: the large diameter portion with circular cross-section for security, the thread portions for fixation, and the engagement portion for initial assembly. This segmentation allows each portion to optimize its specific function while working together as a unified system.
Solution Approach 2:
The engagement portion acts as an intermediary that facilitates assembly. It provides a temporary interface for tool engagement during the assembly process, allowing the stud bolt to be properly positioned and secured before the final nut tightening, thus resolving the conflict between security and ease of assembly.
3Ease of operation
If the engagement portion is provided on the stud bolt, then the ease of assembly is improved, but the structural complexity increases
Solution Approach 1:
The engagement portion is merged with the large diameter portion as an integrated feature rather than a separate component. This combining approach provides the assembly facilitation function while minimizing the increase in structural complexity, as both features are part of the same continuous structure on the stud bolt.
Data Source
AI summary
A stud bolt has a first thread portion, a second thread portion, an engagement portion and a large diameter portion. The first thread portion is screwable into a first member about a screw axis. The second thread portion is screwable into a second member about the screw axis and is provided coaxially with the first thread portion. The engagement portion is provided on a side of the second thread portion, which is opposite from the first thread portion. The large diameter portion has a circular cross-section perpendicular to the screw axis. The large diameter portion is located between the first thread portion and the second thread portion. An outer diameter of the large diameter portion is larger than an outer diameter of the first thread portion and the outer diameter of the second thread portion.