Screw Head Stub-Groove Locking for Vibration-Resistant Casing Assembly
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Solution Overview
Problem
Screws used to fasten electronic device casings can become loosened due to external impacts or vibrations, leading to a reduction in the fastening force and potential separation of the casings, which increases manufacturing costs and reduces the reliability of the device.
Innovation Solution
A screw anti-loosening structure is implemented, featuring a screw with stubs protruding from the inner sidewall of one casing and corresponding stub grooves on the screw head, which prevent reverse rotation of the screw, ensuring secure fastening of the casings and preventing loosening due to external vibrations or impacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate element is provided for preventing the upper casing from being detached from the lower casing, then the reliability is improved, but the manufacturing cost increases
Solution Approach 1:
The patent merges the anti-loosening function with the screw structure itself by integrating stubs and stub grooves directly into the screw components. This eliminates the need for separate anti-loosening elements, thereby maintaining reliability while reducing device complexity and manufacturing cost.
Solution Approach 2:
The screw structure performs its own anti-loosening function through the stub-stub groove mechanism built into its design. The screw automatically prevents loosening through its own structural features without requiring additional separate elements, embodying the self-service principle.
2Ease of manufacture
If the screw structure is simplified without anti-loosening features, then the ease of manufacture is improved, but the reliability deteriorates due to screw loosening from vibrations
Solution Approach 1:
The anti-loosening function is merged into the basic screw structure through the integration of stubs and stub grooves. This allows the screw to maintain simplicity and ease of manufacture while simultaneously providing reliable anti-loosening protection against vibrations and external impacts.
Solution Approach 2:
The patent modifies the screw structure by adding stubs protruding from the screw body and corresponding stub grooves on the screw head. These structural parameter changes enable the screw to resist loosening forces while maintaining manufacturing feasibility through straightforward geometric additions.
3Reliability
If stubs and stub grooves are added to prevent reverse rotation, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The anti-loosening mechanism is merged into the screw structure itself rather than being a separate component. The stubs and stub grooves are integrated features of the screw, combining the fastening and anti-loosening functions into a single unified structure that does not increase overall device complexity.
Solution Approach 2:
The screw structure is segmented into functional zones: the screw body with protruding stubs and the screw head with stub grooves. This segmentation allows each part to perform its specific function while maintaining overall structural simplicity and avoiding the need for complex integrated mechanisms.
Data Source
AI summary
A screw anti-loosening structure is provided including a screw disposed within a screw hole. The screw hole is disposed within a first casing. A screw groove is disposed within a second casing. At least one stub protrudes toward the screw hole of the first casing. The screw anti-loosening structure further includes at least one stub groove disposed within a side surface of a head of the screw. The at least one stub is disposed within the stub groove.