Electrical Connector Terminal Retention via Interlocking Tabs and Rails
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Solution Overview
Problem
Existing electrical connectors face challenges in securely retaining terminals within connector bodies, particularly in preventing accidental withdrawal or movement due to lack of effective interlocking mechanisms.
Innovation Solution
The electrical connector design incorporates tabs, rails, and knobs within the connector body's cavity to securely interlock with the terminal, preventing withdrawal and axial movement by using a combination of protruding features that engage during insertion and reversal, ensuring stable positioning and retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If terminals are secured in place requiring a tool for removal, then terminal retention is improved, but device complexity and ease of operation deteriorate
Solution Approach 1:
The connector body is segmented into multiple functional elements (rails and knobs) that work together to secure terminals. Each rail engages with corresponding tabs on the terminal, while knobs provide additional retention features. This segmentation allows the complex retention function to be distributed across multiple simple components rather than requiring a single complex tool-based mechanism.
Solution Approach 2:
The terminal retention mechanism is designed to be self-securing during insertion. As the terminal is inserted, the tabs automatically engage with the rails and knobs, creating a self-locking effect that secures the terminal without requiring external tools. The terminal itself participates in the securing process by its own insertion motion engaging the retention features.
2Reliability
If terminals are secured with tool-required removal, then terminal retention is improved, but ease of operation deteriorates
Solution Approach 1:
The retention mechanism transitions from a static tool-required system to a dynamic self-adjusting system. During insertion, the tabs dynamically engage with the rails and knobs, allowing the terminal to be securely retained through simple push-in motion. The mechanism adapts to the insertion force and automatically locks into place, making operation easier while maintaining reliability.
Solution Approach 2:
The terminal and connector body work together in a self-service manner where the terminal's own insertion motion activates the retention mechanism. The tabs on the terminal engage with the rails and knobs during normal insertion, automatically securing the terminal without requiring separate tool-based operations. This eliminates the need for tools while maintaining secure retention.
3Ease of operation
If simple terminal insertion is allowed, then ease of operation is improved, but terminal stability deteriorates due to lack of interlocking
Solution Approach 1:
The retention features utilize asymmetric geometry where the tabs on the terminal have specific shapes that correspond to asymmetric rail and knob profiles. This asymmetric design ensures that the terminal can be easily inserted in the correct orientation while the interlocking features prevent withdrawal or movement in other directions. The asymmetric shapes create a unidirectional engagement that provides stability without complicating insertion.
Solution Approach 2:
The terminal tabs are nested within the cavity formed by the rails and knobs. The tabs fit into the spaces between these protruding features, creating a nested interlocking arrangement. This nesting provides stable positioning as the terminal is surrounded and constrained by the retention features, while still allowing easy insertion as the tabs guide the terminal into its final positioned state.
Data Source
Figure 1~2
Figure 3~6
AI summary
An electrical connector (10) includes a male terminal (12) and a connector body (14). The male terminal (12) has one or more tabs (30, 32). The connector body (14) has a cavity (44) that is constructed and sized to receive the male terminal (12). The connector body (14) has one or more rails (50, 52), and has one or more knobs (54, 56). When the male terminal (12) is received in the cavity (44), the tab (30, 32) bears against the rail (50, 52) and bears against the knob (54, 56).