Rubber Plug Holder Locking Recess to Prevent Detachment
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Solution Overview
Problem
Existing rubber plug assemblies for sealing voltage detection holes in connectors are prone to detachment due to strong pulling forces, which can cause the fixing portion to come out of the through hole and lead to the rubber plug being detached from the voltage detection cover.
Innovation Solution
A rubber plug assembly with a rubber plug body and a leg having a continuous peripheral wall, a rubber plug holder with a projection that fits into a recess on the leg, and positioning pins to prevent movement away from the cover, ensuring the rubber plug is securely fixed to the cover even when inclined, and locks to maintain the assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the sealing plug body is press-fit connected to the through hole in the voltage detection cover, then the rubber plug can be easily installed and removed, but the fixing portion may come out of the through hole when pulled strongly, causing detachment
Solution Approach 1:
The fixing portion is divided into multiple engagement points: the press-fit connection through the through hole and the additional engagement with the recess in the leg. This segmentation distributes the detachment force across multiple points, preventing single-point failure while maintaining ease of installation.
Solution Approach 2:
The projection of the fixing portion is inserted into the recess of the leg, creating a nested structure where the fixing portion is partially contained within the leg's recess. This nested arrangement provides an additional mechanical interlock that prevents detachment while allowing straightforward installation.
2Device complexity
If the fixing portion is designed with a simple press-fit structure, then the device complexity is reduced, but the reliability under strong pulling force deteriorates
Solution Approach 1:
The fixing structure is segmented into the press-fit through hole and the additional recess engagement, providing enhanced reliability without requiring a completely complex fixing mechanism. The segmentation allows each component to perform its specific function simply and effectively.
Solution Approach 2:
The recess in the leg acts as an intermediary structure that mediates between the press-fit connection and the cover, providing an additional engagement point that enhances reliability without significantly increasing overall device complexity.
3Ease of operation
If the leg is allowed to move freely along the cover, then the ease of operation is improved, but the rubber plug may detach from the cover
Solution Approach 1:
The leg is designed with dynamic characteristics, allowing it to move freely along the cover for ease of operation. The recess in the leg provides a dynamic engagement with the projection, allowing movement within limits while preventing complete detachment.
Solution Approach 2:
The rubber plug body, being made of rubber, provides flexible adaptation to the cover and leg movements. This flexibility allows the plug to maintain sealing and attachment while accommodating normal operational movements of the leg along the cover.
Data Source
AI summary
A rubber plug assembly 40 disclosed by this specification is provided with a rubber plug 50 including a rubber plug body portion 51 for waterproofing the interior of a housing 20, leg portions 52 being provided around the rubber plug body portion 51, peripheral walls 54 of recesses (through holes 53) provided in the leg portions 52 being continuous without interruption, a cover 70 to be fixed to the housing 20 while covering the rubber plug 50, and a rubber plug holder 60 including rubber plug fixing portions 64 disposed on a side opposite to the cover 70 with respect to the leg portions 52, projections 66 to be fit into the recesses from the side opposite to the cover 70 being provided on the rubber plug fixing portions 64, the rubber plug holder 60 being fixed to the cover 70 with movements of the leg portions 52 along the cover 70 suppressed by locking the projections 66 to the peripheral walls 54 of the recesses.